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< li class = "navelem" > < a class = "el" href = "../../dir_39dc0668bd5a501998f94e8b4e546c71.html" > media< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_c6ada2450b25ab5438a4dba6c9b890af.html" > base< / a > < / li > < / ul >
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< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright (c) 2013 The Chromium Authors. All rights reserved.< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > // Use of this source code is governed by a BSD-style license that can be< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // found in the LICENSE file.< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "preprocessor" > #include " packager/media/base/container_names.h" < / span > < / div >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < / div >
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< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "preprocessor" > #include < libxml/parser.h> < / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < span class = "preprocessor" > #include < libxml/tree.h> < / span > < / div >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include < stdint.h> < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include < cctype> < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "preprocessor" > #include < limits> < / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
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< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "preprocessor" > #include " packager/base/strings/string_util.h" < / span > < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < span class = "preprocessor" > #include " packager/media/base/bit_reader.h" < / span > < / div >
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< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "preprocessor" > #include " packager/mpd/base/xml/scoped_xml_ptr.h" < / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < / div >
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< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "keyword" > namespace < / span > shaka {< / div >
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< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < span class = "keyword" > namespace < / span > media {< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "preprocessor" > #define TAG(a, b, c, d) \< / span > < / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < span class = "preprocessor" > ((static_cast< uint32_t> (static_cast< uint8_t> (a)) < < 24) | \< / span > < / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "preprocessor" > (static_cast< uint8_t> (b) < < 16) | (static_cast< uint8_t> (c) < < 8) | \< / span > < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "preprocessor" > (static_cast< uint8_t> (d)))< / span > < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "preprocessor" > < / span > < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < span class = "preprocessor" > #define RCHECK(x) \< / span > < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "preprocessor" > do { \< / span > < / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "preprocessor" > if (!(x)) \< / span > < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "preprocessor" > return false; \< / span > < / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "preprocessor" > } while (0)< / span > < / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "preprocessor" > < / span > < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "preprocessor" > #define UTF8_BYTE_ORDER_MARK " \xef\xbb\xbf" < / span > < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "preprocessor" > < / span > < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "comment" > // Helper function to read 2 bytes (16 bits, big endian) from a buffer.< / span > < / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > Read16(< span class = "keyword" > const< / span > uint8_t* p) {< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordflow" > return< / span > p[0] < < 8 | p[1];< / div >
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< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   }< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < / div >
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< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "comment" > // Helper function to read 3 bytes (24 bits, big endian) from a buffer.< / span > < / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "keyword" > static< / span > uint32_t Read24(< span class = "keyword" > const< / span > uint8_t* p) {< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < span class = "keywordflow" > return< / span > p[0] < < 16 | p[1] < < 8 | p[2];< / div >
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< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   }< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < / div >
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< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   < span class = "comment" > // Helper function to read 4 bytes (32 bits, big endian) from a buffer.< / span > < / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   < span class = "keyword" > static< / span > uint32_t Read32(< span class = "keyword" > const< / span > uint8_t* p) {< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   < span class = "keywordflow" > return< / span > p[0] < < 24 | p[1] < < 16 | p[2] < < 8 | p[3];< / div >
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< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   }< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < / div >
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< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   < span class = "comment" > // Helper function to read 4 bytes (32 bits, little endian) from a buffer.< / span > < / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "keyword" > static< / span > uint32_t Read32LE(< span class = "keyword" > const< / span > uint8_t* p) {< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < span class = "keywordflow" > return< / span > p[3] < < 24 | p[2] < < 16 | p[1] < < 8 | p[0];< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   }< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "comment" > // Helper function to do buffer comparisons with a string without going off the< / span > < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "comment" > // end of the buffer.< / span > < / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > StartsWith(< span class = "keyword" > const< / span > uint8_t* buffer,< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < span class = "keywordtype" > size_t< / span > buffer_size,< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > * prefix) {< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordtype" > size_t< / span > prefix_size = strlen(prefix);< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > return< / span > (prefix_size < = buffer_size & & < / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   memcmp(buffer, prefix, prefix_size) == 0);< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   }< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   < / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "comment" > // Helper function to do buffer comparisons with another buffer (to allow for< / span > < / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "comment" > // embedded \0 in the comparison) without going off the end of the buffer.< / span > < / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > StartsWith(< span class = "keyword" > const< / span > uint8_t* buffer,< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   < span class = "keywordtype" > size_t< / span > buffer_size,< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < span class = "keyword" > const< / span > uint8_t* prefix,< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   < span class = "keywordtype" > size_t< / span > prefix_size) {< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < span class = "keywordflow" > return< / span > (prefix_size < = buffer_size & & < / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   memcmp(buffer, prefix, prefix_size) == 0);< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   }< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "comment" > // Helper function to read up to 64 bits from a bit stream.< / span > < / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < span class = "keyword" > static< / span > uint64_t ReadBits(BitReader* reader, < span class = "keywordtype" > int< / span > num_bits) {< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   DCHECK_GE(reader-> bits_available(), num_bits);< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   DCHECK((num_bits > 0) & & (num_bits < = 64));< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   uint64_t value;< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   reader-> ReadBits(num_bits, & value);< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < span class = "keywordflow" > return< / span > value;< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   }< / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > kAc3FrameSizeTable[38][3] = {< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   { 128, 138, 192 }, { 128, 140, 192 }, { 160, 174, 240 }, { 160, 176, 240 },< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   { 192, 208, 288 }, { 192, 210, 288 }, { 224, 242, 336 }, { 224, 244, 336 },< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   { 256, 278, 384 }, { 256, 280, 384 }, { 320, 348, 480 }, { 320, 350, 480 },< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   { 384, 416, 576 }, { 384, 418, 576 }, { 448, 486, 672 }, { 448, 488, 672 },< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   { 512, 556, 768 }, { 512, 558, 768 }, { 640, 696, 960 }, { 640, 698, 960 },< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   { 768, 834, 1152 }, { 768, 836, 1152 }, { 896, 974, 1344 },< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   { 896, 976, 1344 }, { 1024, 1114, 1536 }, { 1024, 1116, 1536 },< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   { 1280, 1392, 1920 }, { 1280, 1394, 1920 }, { 1536, 1670, 2304 },< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   { 1536, 1672, 2304 }, { 1792, 1950, 2688 }, { 1792, 1952, 2688 },< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   { 2048, 2228, 3072 }, { 2048, 2230, 3072 }, { 2304, 2506, 3456 },< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   { 2304, 2508, 3456 }, { 2560, 2768, 3840 }, { 2560, 2770, 3840 }< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   };< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "comment" > // Checks for an ADTS AAC container.< / span > < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckAac(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < span class = "comment" > // Audio Data Transport Stream (ADTS) header is 7 or 9 bytes< / span > < / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < span class = "comment" > // (from http://wiki.multimedia.cx/index.php?title=ADTS)< / span > < / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   RCHECK(buffer_size > 6);< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < span class = "keywordflow" > while< / span > (offset + 6 < buffer_size) {< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   BitReader reader(buffer + offset, 6);< / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < span class = "comment" > // Syncword must be 0xfff.< / span > < / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   RCHECK(ReadBits(& reader, 12) == 0xfff);< / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   < / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   < span class = "comment" > // Skip MPEG version.< / span > < / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   reader.SkipBits(1);< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < span class = "comment" > // Layer is always 0.< / span > < / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   RCHECK(ReadBits(& reader, 2) == 0);< / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   < / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < span class = "comment" > // Skip protection + profile.< / span > < / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   reader.SkipBits(1 + 2);< / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < span class = "comment" > // Check sampling frequency index.< / span > < / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   RCHECK(ReadBits(& reader, 4) != 15); < span class = "comment" > // Forbidden.< / span > < / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   < span class = "comment" > // Skip private stream, channel configuration, originality, home,< / span > < / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < span class = "comment" > // copyrighted stream, and copyright_start.< / span > < / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   reader.SkipBits(1 + 3 + 1 + 1 + 1 + 1);< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   < / div >
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   < span class = "comment" > // Get frame length (includes header).< / span > < / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   < span class = "keywordtype" > int< / span > size = ReadBits(& reader, 13);< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   RCHECK(size > 0);< / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   offset += size;< / div >
< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   }< / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   }< / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   < span class = "keyword" > const< / span > uint16_t kAc3SyncWord = 0x0b77;< / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   < span class = "comment" > // Checks for an AC3 container.< / span > < / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckAc3(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   < span class = "comment" > // Reference: ATSC Standard: Digital Audio Compression (AC-3, E-AC-3)< / span > < / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   < span class = "comment" > // Doc. A/52:2012< / span > < / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   < span class = "comment" > // (http://www.atsc.org/cms/standards/A52-2012(12-17).pdf)< / span > < / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   < / div >
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   < span class = "comment" > // AC3 container looks like syncinfo | bsi | audblk * 6 | aux | check.< / span > < / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   RCHECK(buffer_size > 6);< / div >
< div class = "line" > < a name = "l00145" > < / a > < span class = "lineno" > 145< / span >   < / div >
< div class = "line" > < a name = "l00146" > < / a > < span class = "lineno" > 146< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > 147< / span >   < span class = "keywordflow" > while< / span > (offset + 6 < buffer_size) {< / div >
< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   BitReader reader(buffer + offset, 6);< / div >
< div class = "line" > < a name = "l00149" > < / a > < span class = "lineno" > 149< / span >   < / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < span class = "comment" > // Check syncinfo.< / span > < / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   RCHECK(ReadBits(& reader, 16) == kAc3SyncWord);< / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   < / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   < span class = "comment" > // Skip crc1.< / span > < / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   reader.SkipBits(16);< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   < / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   < span class = "comment" > // Verify fscod.< / span > < / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   < span class = "keywordtype" > int< / span > sample_rate_code = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   RCHECK(sample_rate_code != 3); < span class = "comment" > // Reserved.< / span > < / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   < / div >
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   < span class = "comment" > // Verify frmsizecod.< / span > < / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   < span class = "keywordtype" > int< / span > frame_size_code = ReadBits(& reader, 6);< / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   RCHECK(frame_size_code < 38); < span class = "comment" > // Undefined.< / span > < / div >
< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   < / div >
< div class = "line" > < a name = "l00164" > < / a > < span class = "lineno" > 164< / span >   < span class = "comment" > // Verify bsid.< / span > < / div >
< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   RCHECK(ReadBits(& reader, 5) < 10); < span class = "comment" > // Normally 8 or 6, 16 used by EAC3.< / span > < / div >
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< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   < / div >
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< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   offset += kAc3FrameSizeTable[frame_size_code][sample_rate_code];< / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   }< / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   }< / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   < / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < span class = "comment" > // Checks for an EAC3 container (very similar to AC3)< / span > < / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckEac3(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < span class = "comment" > // Reference: ATSC Standard: Digital Audio Compression (AC-3, E-AC-3)< / span > < / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < span class = "comment" > // Doc. A/52:2012< / span > < / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   < span class = "comment" > // (http://www.atsc.org/cms/standards/A52-2012(12-17).pdf)< / span > < / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   < span class = "comment" > // EAC3 container looks like syncinfo | bsi | audfrm | audblk* | aux | check.< / span > < / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   RCHECK(buffer_size > 6);< / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   < / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   < span class = "keywordflow" > while< / span > (offset + 6 < buffer_size) {< / div >
< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > 183< / span >   BitReader reader(buffer + offset, 6);< / div >
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   < / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   < span class = "comment" > // Check syncinfo.< / span > < / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   RCHECK(ReadBits(& reader, 16) == kAc3SyncWord);< / div >
< div class = "line" > < a name = "l00187" > < / a > < span class = "lineno" > 187< / span >   < / div >
< div class = "line" > < a name = "l00188" > < / a > < span class = "lineno" > 188< / span >   < span class = "comment" > // Verify strmtyp.< / span > < / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   RCHECK(ReadBits(& reader, 2) != 3);< / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   < / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   < span class = "comment" > // Skip substreamid.< / span > < / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   reader.SkipBits(3);< / div >
< div class = "line" > < a name = "l00193" > < / a > < span class = "lineno" > 193< / span >   < / div >
< div class = "line" > < a name = "l00194" > < / a > < span class = "lineno" > 194< / span >   < span class = "comment" > // Get frmsize. Include syncinfo size and convert to bytes.< / span > < / div >
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   < span class = "keywordtype" > int< / span > frame_size = (ReadBits(& reader, 11) + 1) * 2;< / div >
< div class = "line" > < a name = "l00196" > < / a > < span class = "lineno" > 196< / span >   RCHECK(frame_size > = 7);< / div >
< div class = "line" > < a name = "l00197" > < / a > < span class = "lineno" > 197< / span >   < / div >
< div class = "line" > < a name = "l00198" > < / a > < span class = "lineno" > 198< / span >   < span class = "comment" > // Skip fscod, fscod2, acmod, and lfeon.< / span > < / div >
< div class = "line" > < a name = "l00199" > < / a > < span class = "lineno" > 199< / span >   reader.SkipBits(2 + 2 + 3 + 1);< / div >
< div class = "line" > < a name = "l00200" > < / a > < span class = "lineno" > 200< / span >   < / div >
< div class = "line" > < a name = "l00201" > < / a > < span class = "lineno" > 201< / span >   < span class = "comment" > // Verify bsid.< / span > < / div >
< div class = "line" > < a name = "l00202" > < / a > < span class = "lineno" > 202< / span >   < span class = "keywordtype" > int< / span > bit_stream_id = ReadBits(& reader, 5);< / div >
< div class = "line" > < a name = "l00203" > < / a > < span class = "lineno" > 203< / span >   RCHECK(bit_stream_id > = 11 & & bit_stream_id < = 16);< / div >
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< div class = "line" > < a name = "l00204" > < / a > < span class = "lineno" > 204< / span >   < / div >
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< div class = "line" > < a name = "l00205" > < / a > < span class = "lineno" > 205< / span >   offset += frame_size;< / div >
< div class = "line" > < a name = "l00206" > < / a > < span class = "lineno" > 206< / span >   }< / div >
< div class = "line" > < a name = "l00207" > < / a > < span class = "lineno" > 207< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00208" > < / a > < span class = "lineno" > 208< / span >   }< / div >
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< div class = "line" > < a name = "l00209" > < / a > < span class = "lineno" > 209< / span >   < / div >
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< div class = "line" > < a name = "l00210" > < / a > < span class = "lineno" > 210< / span >   < span class = "comment" > // Additional checks for a BINK container.< / span > < / div >
< div class = "line" > < a name = "l00211" > < / a > < span class = "lineno" > 211< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckBink(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00212" > < / a > < span class = "lineno" > 212< / span >   < span class = "comment" > // Reference: http://wiki.multimedia.cx/index.php?title=Bink_Container< / span > < / div >
< div class = "line" > < a name = "l00213" > < / a > < span class = "lineno" > 213< / span >   RCHECK(buffer_size > = 44);< / div >
< div class = "line" > < a name = "l00214" > < / a > < span class = "lineno" > 214< / span >   < / div >
< div class = "line" > < a name = "l00215" > < / a > < span class = "lineno" > 215< / span >   < span class = "comment" > // Verify number of frames specified.< / span > < / div >
< div class = "line" > < a name = "l00216" > < / a > < span class = "lineno" > 216< / span >   RCHECK(Read32LE(buffer + 8) > 0);< / div >
< div class = "line" > < a name = "l00217" > < / a > < span class = "lineno" > 217< / span >   < / div >
< div class = "line" > < a name = "l00218" > < / a > < span class = "lineno" > 218< / span >   < span class = "comment" > // Verify width in range.< / span > < / div >
< div class = "line" > < a name = "l00219" > < / a > < span class = "lineno" > 219< / span >   < span class = "keywordtype" > int< / span > width = Read32LE(buffer + 20);< / div >
< div class = "line" > < a name = "l00220" > < / a > < span class = "lineno" > 220< / span >   RCHECK(width > 0 & & width < = 32767);< / div >
< div class = "line" > < a name = "l00221" > < / a > < span class = "lineno" > 221< / span >   < / div >
< div class = "line" > < a name = "l00222" > < / a > < span class = "lineno" > 222< / span >   < span class = "comment" > // Verify height in range.< / span > < / div >
< div class = "line" > < a name = "l00223" > < / a > < span class = "lineno" > 223< / span >   < span class = "keywordtype" > int< / span > height = Read32LE(buffer + 24);< / div >
< div class = "line" > < a name = "l00224" > < / a > < span class = "lineno" > 224< / span >   RCHECK(height > 0 & & height < = 32767);< / div >
< div class = "line" > < a name = "l00225" > < / a > < span class = "lineno" > 225< / span >   < / div >
< div class = "line" > < a name = "l00226" > < / a > < span class = "lineno" > 226< / span >   < span class = "comment" > // Verify frames per second specified.< / span > < / div >
< div class = "line" > < a name = "l00227" > < / a > < span class = "lineno" > 227< / span >   RCHECK(Read32LE(buffer + 28) > 0);< / div >
< div class = "line" > < a name = "l00228" > < / a > < span class = "lineno" > 228< / span >   < / div >
< div class = "line" > < a name = "l00229" > < / a > < span class = "lineno" > 229< / span >   < span class = "comment" > // Verify video frames per second specified.< / span > < / div >
< div class = "line" > < a name = "l00230" > < / a > < span class = "lineno" > 230< / span >   RCHECK(Read32LE(buffer + 32) > 0);< / div >
< div class = "line" > < a name = "l00231" > < / a > < span class = "lineno" > 231< / span >   < / div >
< div class = "line" > < a name = "l00232" > < / a > < span class = "lineno" > 232< / span >   < span class = "comment" > // Number of audio tracks must be 256 or less.< / span > < / div >
< div class = "line" > < a name = "l00233" > < / a > < span class = "lineno" > 233< / span >   < span class = "keywordflow" > return< / span > (Read32LE(buffer + 40) < = 256);< / div >
< div class = "line" > < a name = "l00234" > < / a > < span class = "lineno" > 234< / span >   }< / div >
< div class = "line" > < a name = "l00235" > < / a > < span class = "lineno" > 235< / span >   < / div >
< div class = "line" > < a name = "l00236" > < / a > < span class = "lineno" > 236< / span >   < span class = "comment" > // Additional checks for a CAF container.< / span > < / div >
< div class = "line" > < a name = "l00237" > < / a > < span class = "lineno" > 237< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckCaf(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00238" > < / a > < span class = "lineno" > 238< / span >   < span class = "comment" > // Reference: Apple Core Audio Format Specification 1.0< / span > < / div >
< div class = "line" > < a name = "l00239" > < / a > < span class = "lineno" > 239< / span >   < span class = "comment" > // (https://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/CAFSpec/CAF_spec/CAF_spec.html)< / span > < / div >
< div class = "line" > < a name = "l00240" > < / a > < span class = "lineno" > 240< / span >   RCHECK(buffer_size > = 52);< / div >
< div class = "line" > < a name = "l00241" > < / a > < span class = "lineno" > 241< / span >   BitReader reader(buffer, buffer_size);< / div >
< div class = "line" > < a name = "l00242" > < / a > < span class = "lineno" > 242< / span >   < / div >
< div class = "line" > < a name = "l00243" > < / a > < span class = "lineno" > 243< / span >   < span class = "comment" > // mFileType should be " caff" .< / span > < / div >
< div class = "line" > < a name = "l00244" > < / a > < span class = "lineno" > 244< / span >   RCHECK(ReadBits(& reader, 32) == TAG(< span class = "charliteral" > ' c' < / span > , < span class = "charliteral" > ' a' < / span > , < span class = "charliteral" > ' f' < / span > , < span class = "charliteral" > ' f' < / span > ));< / div >
< div class = "line" > < a name = "l00245" > < / a > < span class = "lineno" > 245< / span >   < / div >
< div class = "line" > < a name = "l00246" > < / a > < span class = "lineno" > 246< / span >   < span class = "comment" > // mFileVersion should be 1.< / span > < / div >
< div class = "line" > < a name = "l00247" > < / a > < span class = "lineno" > 247< / span >   RCHECK(ReadBits(& reader, 16) == 1);< / div >
< div class = "line" > < a name = "l00248" > < / a > < span class = "lineno" > 248< / span >   < / div >
< div class = "line" > < a name = "l00249" > < / a > < span class = "lineno" > 249< / span >   < span class = "comment" > // Skip mFileFlags.< / span > < / div >
< div class = "line" > < a name = "l00250" > < / a > < span class = "lineno" > 250< / span >   reader.SkipBits(16);< / div >
< div class = "line" > < a name = "l00251" > < / a > < span class = "lineno" > 251< / span >   < / div >
< div class = "line" > < a name = "l00252" > < / a > < span class = "lineno" > 252< / span >   < span class = "comment" > // First chunk should be Audio Description chunk, size 32l.< / span > < / div >
< div class = "line" > < a name = "l00253" > < / a > < span class = "lineno" > 253< / span >   RCHECK(ReadBits(& reader, 32) == TAG(< span class = "charliteral" > ' d' < / span > , < span class = "charliteral" > ' e' < / span > , < span class = "charliteral" > ' s' < / span > , < span class = "charliteral" > ' c' < / span > ));< / div >
< div class = "line" > < a name = "l00254" > < / a > < span class = "lineno" > 254< / span >   RCHECK(ReadBits(& reader, 64) == 32);< / div >
< div class = "line" > < a name = "l00255" > < / a > < span class = "lineno" > 255< / span >   < / div >
< div class = "line" > < a name = "l00256" > < / a > < span class = "lineno" > 256< / span >   < span class = "comment" > // CAFAudioFormat.mSampleRate(float64) not 0< / span > < / div >
< div class = "line" > < a name = "l00257" > < / a > < span class = "lineno" > 257< / span >   RCHECK(ReadBits(& reader, 64) != 0);< / div >
< div class = "line" > < a name = "l00258" > < / a > < span class = "lineno" > 258< / span >   < / div >
< div class = "line" > < a name = "l00259" > < / a > < span class = "lineno" > 259< / span >   < span class = "comment" > // CAFAudioFormat.mFormatID not 0< / span > < / div >
< div class = "line" > < a name = "l00260" > < / a > < span class = "lineno" > 260< / span >   RCHECK(ReadBits(& reader, 32) != 0);< / div >
< div class = "line" > < a name = "l00261" > < / a > < span class = "lineno" > 261< / span >   < / div >
< div class = "line" > < a name = "l00262" > < / a > < span class = "lineno" > 262< / span >   < span class = "comment" > // Skip CAFAudioFormat.mBytesPerPacket and mFramesPerPacket.< / span > < / div >
< div class = "line" > < a name = "l00263" > < / a > < span class = "lineno" > 263< / span >   reader.SkipBits(32 + 32);< / div >
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< div class = "line" > < a name = "l00264" > < / a > < span class = "lineno" > 264< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00265" > < / a > < span class = "lineno" > 265< / span >   < span class = "comment" > // CAFAudioFormat.mChannelsPerFrame not 0< / span > < / div >
< div class = "line" > < a name = "l00266" > < / a > < span class = "lineno" > 266< / span >   RCHECK(ReadBits(& reader, 32) != 0);< / div >
< div class = "line" > < a name = "l00267" > < / a > < span class = "lineno" > 267< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00268" > < / a > < span class = "lineno" > 268< / span >   }< / div >
< div class = "line" > < a name = "l00269" > < / a > < span class = "lineno" > 269< / span >   < / div >
< div class = "line" > < a name = "l00270" > < / a > < span class = "lineno" > 270< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > kSamplingFrequencyValid[16] = { < span class = "keyword" > false< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > false< / span > ,< / div >
< div class = "line" > < a name = "l00271" > < / a > < span class = "lineno" > 271< / span >   < span class = "keyword" > false< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > false< / span > ,< / div >
< div class = "line" > < a name = "l00272" > < / a > < span class = "lineno" > 272< / span >   < span class = "keyword" > false< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > false< / span > ,< / div >
< div class = "line" > < a name = "l00273" > < / a > < span class = "lineno" > 273< / span >   < span class = "keyword" > false< / span > };< / div >
< div class = "line" > < a name = "l00274" > < / a > < span class = "lineno" > 274< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > kExtAudioIdValid[8] = { < span class = "keyword" > true< / span > , < span class = "keyword" > false< / span > , < span class = "keyword" > true< / span > , < span class = "keyword" > false< / span > , < span class = "keyword" > false< / span > , < span class = "keyword" > false< / span > ,< / div >
< div class = "line" > < a name = "l00275" > < / a > < span class = "lineno" > 275< / span >   < span class = "keyword" > true< / span > , < span class = "keyword" > false< / span > };< / div >
< div class = "line" > < a name = "l00276" > < / a > < span class = "lineno" > 276< / span >   < / div >
< div class = "line" > < a name = "l00277" > < / a > < span class = "lineno" > 277< / span >   < span class = "comment" > // Additional checks for a DTS container.< / span > < / div >
< div class = "line" > < a name = "l00278" > < / a > < span class = "lineno" > 278< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckDts(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00279" > < / a > < span class = "lineno" > 279< / span >   < span class = "comment" > // Reference: ETSI TS 102 114 V1.3.1 (2011-08)< / span > < / div >
< div class = "line" > < a name = "l00280" > < / a > < span class = "lineno" > 280< / span >   < span class = "comment" > // (http://www.etsi.org/deliver/etsi_ts/102100_102199/102114/01.03.01_60/ts_102114v010301p.pdf)< / span > < / div >
< div class = "line" > < a name = "l00281" > < / a > < span class = "lineno" > 281< / span >   RCHECK(buffer_size > 11);< / div >
< div class = "line" > < a name = "l00282" > < / a > < span class = "lineno" > 282< / span >   < / div >
< div class = "line" > < a name = "l00283" > < / a > < span class = "lineno" > 283< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00284" > < / a > < span class = "lineno" > 284< / span >   < span class = "keywordflow" > while< / span > (offset + 11 < buffer_size) {< / div >
< div class = "line" > < a name = "l00285" > < / a > < span class = "lineno" > 285< / span >   BitReader reader(buffer + offset, 11);< / div >
< div class = "line" > < a name = "l00286" > < / a > < span class = "lineno" > 286< / span >   < / div >
< div class = "line" > < a name = "l00287" > < / a > < span class = "lineno" > 287< / span >   < span class = "comment" > // Verify sync word.< / span > < / div >
< div class = "line" > < a name = "l00288" > < / a > < span class = "lineno" > 288< / span >   RCHECK(ReadBits(& reader, 32) == 0x7ffe8001);< / div >
< div class = "line" > < a name = "l00289" > < / a > < span class = "lineno" > 289< / span >   < / div >
< div class = "line" > < a name = "l00290" > < / a > < span class = "lineno" > 290< / span >   < span class = "comment" > // Skip frame type and deficit sample count.< / span > < / div >
< div class = "line" > < a name = "l00291" > < / a > < span class = "lineno" > 291< / span >   reader.SkipBits(1 + 5);< / div >
< div class = "line" > < a name = "l00292" > < / a > < span class = "lineno" > 292< / span >   < / div >
< div class = "line" > < a name = "l00293" > < / a > < span class = "lineno" > 293< / span >   < span class = "comment" > // Verify CRC present flag.< / span > < / div >
< div class = "line" > < a name = "l00294" > < / a > < span class = "lineno" > 294< / span >   RCHECK(ReadBits(& reader, 1) == 0); < span class = "comment" > // CPF must be 0.< / span > < / div >
< div class = "line" > < a name = "l00295" > < / a > < span class = "lineno" > 295< / span >   < / div >
< div class = "line" > < a name = "l00296" > < / a > < span class = "lineno" > 296< / span >   < span class = "comment" > // Verify number of PCM sample blocks.< / span > < / div >
< div class = "line" > < a name = "l00297" > < / a > < span class = "lineno" > 297< / span >   RCHECK(ReadBits(& reader, 7) > = 5);< / div >
< div class = "line" > < a name = "l00298" > < / a > < span class = "lineno" > 298< / span >   < / div >
< div class = "line" > < a name = "l00299" > < / a > < span class = "lineno" > 299< / span >   < span class = "comment" > // Verify primary frame byte size.< / span > < / div >
< div class = "line" > < a name = "l00300" > < / a > < span class = "lineno" > 300< / span >   < span class = "keywordtype" > int< / span > frame_size = ReadBits(& reader, 14);< / div >
< div class = "line" > < a name = "l00301" > < / a > < span class = "lineno" > 301< / span >   RCHECK(frame_size > = 95);< / div >
< div class = "line" > < a name = "l00302" > < / a > < span class = "lineno" > 302< / span >   < / div >
< div class = "line" > < a name = "l00303" > < / a > < span class = "lineno" > 303< / span >   < span class = "comment" > // Skip audio channel arrangement.< / span > < / div >
< div class = "line" > < a name = "l00304" > < / a > < span class = "lineno" > 304< / span >   reader.SkipBits(6);< / div >
< div class = "line" > < a name = "l00305" > < / a > < span class = "lineno" > 305< / span >   < / div >
< div class = "line" > < a name = "l00306" > < / a > < span class = "lineno" > 306< / span >   < span class = "comment" > // Verify core audio sampling frequency is an allowed value.< / span > < / div >
< div class = "line" > < a name = "l00307" > < / a > < span class = "lineno" > 307< / span >   RCHECK(kSamplingFrequencyValid[ReadBits(& reader, 4)]);< / div >
< div class = "line" > < a name = "l00308" > < / a > < span class = "lineno" > 308< / span >   < / div >
< div class = "line" > < a name = "l00309" > < / a > < span class = "lineno" > 309< / span >   < span class = "comment" > // Verify transmission bit rate is valid.< / span > < / div >
< div class = "line" > < a name = "l00310" > < / a > < span class = "lineno" > 310< / span >   RCHECK(ReadBits(& reader, 5) < = 25);< / div >
< div class = "line" > < a name = "l00311" > < / a > < span class = "lineno" > 311< / span >   < / div >
< div class = "line" > < a name = "l00312" > < / a > < span class = "lineno" > 312< / span >   < span class = "comment" > // Verify reserved field is 0.< / span > < / div >
< div class = "line" > < a name = "l00313" > < / a > < span class = "lineno" > 313< / span >   RCHECK(ReadBits(& reader, 1) == 0);< / div >
< div class = "line" > < a name = "l00314" > < / a > < span class = "lineno" > 314< / span >   < / div >
< div class = "line" > < a name = "l00315" > < / a > < span class = "lineno" > 315< / span >   < span class = "comment" > // Skip dynamic range flag, time stamp flag, auxiliary data flag, and HDCD.< / span > < / div >
< div class = "line" > < a name = "l00316" > < / a > < span class = "lineno" > 316< / span >   reader.SkipBits(1 + 1 + 1 + 1);< / div >
< div class = "line" > < a name = "l00317" > < / a > < span class = "lineno" > 317< / span >   < / div >
< div class = "line" > < a name = "l00318" > < / a > < span class = "lineno" > 318< / span >   < span class = "comment" > // Verify extension audio descriptor flag is an allowed value.< / span > < / div >
< div class = "line" > < a name = "l00319" > < / a > < span class = "lineno" > 319< / span >   RCHECK(kExtAudioIdValid[ReadBits(& reader, 3)]);< / div >
< div class = "line" > < a name = "l00320" > < / a > < span class = "lineno" > 320< / span >   < / div >
< div class = "line" > < a name = "l00321" > < / a > < span class = "lineno" > 321< / span >   < span class = "comment" > // Skip extended coding flag and audio sync word insertion flag.< / span > < / div >
< div class = "line" > < a name = "l00322" > < / a > < span class = "lineno" > 322< / span >   reader.SkipBits(1 + 1);< / div >
< div class = "line" > < a name = "l00323" > < / a > < span class = "lineno" > 323< / span >   < / div >
< div class = "line" > < a name = "l00324" > < / a > < span class = "lineno" > 324< / span >   < span class = "comment" > // Verify low frequency effects flag is an allowed value.< / span > < / div >
< div class = "line" > < a name = "l00325" > < / a > < span class = "lineno" > 325< / span >   RCHECK(ReadBits(& reader, 2) != 3);< / div >
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< div class = "line" > < a name = "l00326" > < / a > < span class = "lineno" > 326< / span >   < / div >
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< div class = "line" > < a name = "l00327" > < / a > < span class = "lineno" > 327< / span >   offset += frame_size + 1;< / div >
< div class = "line" > < a name = "l00328" > < / a > < span class = "lineno" > 328< / span >   }< / div >
< div class = "line" > < a name = "l00329" > < / a > < span class = "lineno" > 329< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00330" > < / a > < span class = "lineno" > 330< / span >   }< / div >
< div class = "line" > < a name = "l00331" > < / a > < span class = "lineno" > 331< / span >   < / div >
< div class = "line" > < a name = "l00332" > < / a > < span class = "lineno" > 332< / span >   < span class = "comment" > // Checks for a DV container.< / span > < / div >
< div class = "line" > < a name = "l00333" > < / a > < span class = "lineno" > 333< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckDV(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00334" > < / a > < span class = "lineno" > 334< / span >   < span class = "comment" > // Reference: SMPTE 314M (Annex A has differences with IEC 61834).< / span > < / div >
< div class = "line" > < a name = "l00335" > < / a > < span class = "lineno" > 335< / span >   < span class = "comment" > // (http://standards.smpte.org/content/978-1-61482-454-1/st-314-2005/SEC1.body.pdf)< / span > < / div >
< div class = "line" > < a name = "l00336" > < / a > < span class = "lineno" > 336< / span >   RCHECK(buffer_size > 11);< / div >
< div class = "line" > < a name = "l00337" > < / a > < span class = "lineno" > 337< / span >   < / div >
< div class = "line" > < a name = "l00338" > < / a > < span class = "lineno" > 338< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00339" > < / a > < span class = "lineno" > 339< / span >   < span class = "keywordtype" > int< / span > current_sequence_number = -1;< / div >
< div class = "line" > < a name = "l00340" > < / a > < span class = "lineno" > 340< / span >   < span class = "keywordtype" > int< / span > last_block_number[6];< / div >
< div class = "line" > < a name = "l00341" > < / a > < span class = "lineno" > 341< / span >   < span class = "keywordflow" > while< / span > (offset + 11 < buffer_size) {< / div >
< div class = "line" > < a name = "l00342" > < / a > < span class = "lineno" > 342< / span >   BitReader reader(buffer + offset, 11);< / div >
< div class = "line" > < a name = "l00343" > < / a > < span class = "lineno" > 343< / span >   < / div >
< div class = "line" > < a name = "l00344" > < / a > < span class = "lineno" > 344< / span >   < span class = "comment" > // Decode ID data. Sections 5, 6, and 7 are reserved.< / span > < / div >
< div class = "line" > < a name = "l00345" > < / a > < span class = "lineno" > 345< / span >   < span class = "keywordtype" > int< / span > section = ReadBits(& reader, 3);< / div >
< div class = "line" > < a name = "l00346" > < / a > < span class = "lineno" > 346< / span >   RCHECK(section < 5);< / div >
< div class = "line" > < a name = "l00347" > < / a > < span class = "lineno" > 347< / span >   < / div >
< div class = "line" > < a name = "l00348" > < / a > < span class = "lineno" > 348< / span >   < span class = "comment" > // Next bit must be 1.< / span > < / div >
< div class = "line" > < a name = "l00349" > < / a > < span class = "lineno" > 349< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
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< div class = "line" > < a name = "l00350" > < / a > < span class = "lineno" > 350< / span >   < / div >
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< div class = "line" > < a name = "l00351" > < / a > < span class = "lineno" > 351< / span >   < span class = "comment" > // Skip arbitrary bits.< / span > < / div >
< div class = "line" > < a name = "l00352" > < / a > < span class = "lineno" > 352< / span >   reader.SkipBits(4);< / div >
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< div class = "line" > < a name = "l00353" > < / a > < span class = "lineno" > 353< / span >   < / div >
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< div class = "line" > < a name = "l00354" > < / a > < span class = "lineno" > 354< / span >   < span class = "keywordtype" > int< / span > sequence_number = ReadBits(& reader, 4);< / div >
< div class = "line" > < a name = "l00355" > < / a > < span class = "lineno" > 355< / span >   < / div >
< div class = "line" > < a name = "l00356" > < / a > < span class = "lineno" > 356< / span >   < span class = "comment" > // Skip FSC.< / span > < / div >
< div class = "line" > < a name = "l00357" > < / a > < span class = "lineno" > 357< / span >   reader.SkipBits(1);< / div >
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< div class = "line" > < a name = "l00358" > < / a > < span class = "lineno" > 358< / span >   < / div >
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< div class = "line" > < a name = "l00359" > < / a > < span class = "lineno" > 359< / span >   < span class = "comment" > // Next 3 bits must be 1.< / span > < / div >
< div class = "line" > < a name = "l00360" > < / a > < span class = "lineno" > 360< / span >   RCHECK(ReadBits(& reader, 3) == 7);< / div >
< div class = "line" > < a name = "l00361" > < / a > < span class = "lineno" > 361< / span >   < / div >
< div class = "line" > < a name = "l00362" > < / a > < span class = "lineno" > 362< / span >   < span class = "keywordtype" > int< / span > block_number = ReadBits(& reader, 8);< / div >
< div class = "line" > < a name = "l00363" > < / a > < span class = "lineno" > 363< / span >   < / div >
< div class = "line" > < a name = "l00364" > < / a > < span class = "lineno" > 364< / span >   < span class = "keywordflow" > if< / span > (section == 0) { < span class = "comment" > // Header.< / span > < / div >
< div class = "line" > < a name = "l00365" > < / a > < span class = "lineno" > 365< / span >   < span class = "comment" > // Validate the reserved bits in the next 8 bytes.< / span > < / div >
< div class = "line" > < a name = "l00366" > < / a > < span class = "lineno" > 366< / span >   reader.SkipBits(1);< / div >
< div class = "line" > < a name = "l00367" > < / a > < span class = "lineno" > 367< / span >   RCHECK(ReadBits(& reader, 1) == 0);< / div >
< div class = "line" > < a name = "l00368" > < / a > < span class = "lineno" > 368< / span >   RCHECK(ReadBits(& reader, 11) == 0x7ff);< / div >
< div class = "line" > < a name = "l00369" > < / a > < span class = "lineno" > 369< / span >   reader.SkipBits(4);< / div >
< div class = "line" > < a name = "l00370" > < / a > < span class = "lineno" > 370< / span >   RCHECK(ReadBits(& reader, 4) == 0xf);< / div >
< div class = "line" > < a name = "l00371" > < / a > < span class = "lineno" > 371< / span >   reader.SkipBits(4);< / div >
< div class = "line" > < a name = "l00372" > < / a > < span class = "lineno" > 372< / span >   RCHECK(ReadBits(& reader, 4) == 0xf);< / div >
< div class = "line" > < a name = "l00373" > < / a > < span class = "lineno" > 373< / span >   reader.SkipBits(4);< / div >
< div class = "line" > < a name = "l00374" > < / a > < span class = "lineno" > 374< / span >   RCHECK(ReadBits(& reader, 4) == 0xf);< / div >
< div class = "line" > < a name = "l00375" > < / a > < span class = "lineno" > 375< / span >   reader.SkipBits(3);< / div >
< div class = "line" > < a name = "l00376" > < / a > < span class = "lineno" > 376< / span >   RCHECK(ReadBits(& reader, 24) == 0xffffff);< / div >
< div class = "line" > < a name = "l00377" > < / a > < span class = "lineno" > 377< / span >   current_sequence_number = sequence_number;< / div >
< div class = "line" > < a name = "l00378" > < / a > < span class = "lineno" > 378< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > size_t< / span > i = 0; i < arraysize(last_block_number); ++i)< / div >
< div class = "line" > < a name = "l00379" > < / a > < span class = "lineno" > 379< / span >   last_block_number[i] = -1;< / div >
< div class = "line" > < a name = "l00380" > < / a > < span class = "lineno" > 380< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00381" > < / a > < span class = "lineno" > 381< / span >   < span class = "comment" > // Sequence number must match (this will also fail if no header seen).< / span > < / div >
< div class = "line" > < a name = "l00382" > < / a > < span class = "lineno" > 382< / span >   RCHECK(sequence_number == current_sequence_number);< / div >
< div class = "line" > < a name = "l00383" > < / a > < span class = "lineno" > 383< / span >   < span class = "comment" > // Block number should be increasing.< / span > < / div >
< div class = "line" > < a name = "l00384" > < / a > < span class = "lineno" > 384< / span >   RCHECK(block_number > last_block_number[section]);< / div >
< div class = "line" > < a name = "l00385" > < / a > < span class = "lineno" > 385< / span >   last_block_number[section] = block_number;< / div >
< div class = "line" > < a name = "l00386" > < / a > < span class = "lineno" > 386< / span >   }< / div >
< div class = "line" > < a name = "l00387" > < / a > < span class = "lineno" > 387< / span >   < / div >
< div class = "line" > < a name = "l00388" > < / a > < span class = "lineno" > 388< / span >   < span class = "comment" > // Move to next block.< / span > < / div >
< div class = "line" > < a name = "l00389" > < / a > < span class = "lineno" > 389< / span >   offset += 80;< / div >
< div class = "line" > < a name = "l00390" > < / a > < span class = "lineno" > 390< / span >   }< / div >
< div class = "line" > < a name = "l00391" > < / a > < span class = "lineno" > 391< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00392" > < / a > < span class = "lineno" > 392< / span >   }< / div >
< div class = "line" > < a name = "l00393" > < / a > < span class = "lineno" > 393< / span >   < / div >
< div class = "line" > < a name = "l00394" > < / a > < span class = "lineno" > 394< / span >   < / div >
< div class = "line" > < a name = "l00395" > < / a > < span class = "lineno" > 395< / span >   < span class = "comment" > // Checks for a GSM container.< / span > < / div >
< div class = "line" > < a name = "l00396" > < / a > < span class = "lineno" > 396< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckGsm(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00397" > < / a > < span class = "lineno" > 397< / span >   < span class = "comment" > // Reference: ETSI EN 300 961 V8.1.1< / span > < / div >
< div class = "line" > < a name = "l00398" > < / a > < span class = "lineno" > 398< / span >   < span class = "comment" > // (http://www.etsi.org/deliver/etsi_en/300900_300999/300961/08.01.01_60/en_300961v080101p.pdf)< / span > < / div >
< div class = "line" > < a name = "l00399" > < / a > < span class = "lineno" > 399< / span >   < span class = "comment" > // also http://tools.ietf.org/html/rfc3551#page-24< / span > < / div >
< div class = "line" > < a name = "l00400" > < / a > < span class = "lineno" > 400< / span >   < span class = "comment" > // GSM files have a 33 byte block, only first 4 bits are fixed.< / span > < / div >
< div class = "line" > < a name = "l00401" > < / a > < span class = "lineno" > 401< / span >   RCHECK(buffer_size > = 1024); < span class = "comment" > // Need enough data to do a decent check.< / span > < / div >
< div class = "line" > < a name = "l00402" > < / a > < span class = "lineno" > 402< / span >   < / div >
< div class = "line" > < a name = "l00403" > < / a > < span class = "lineno" > 403< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00404" > < / a > < span class = "lineno" > 404< / span >   < span class = "keywordflow" > while< / span > (offset < buffer_size) {< / div >
< div class = "line" > < a name = "l00405" > < / a > < span class = "lineno" > 405< / span >   < span class = "comment" > // First 4 bits of each block are xD.< / span > < / div >
< div class = "line" > < a name = "l00406" > < / a > < span class = "lineno" > 406< / span >   RCHECK((buffer[offset] & 0xf0) == 0xd0);< / div >
< div class = "line" > < a name = "l00407" > < / a > < span class = "lineno" > 407< / span >   offset += 33;< / div >
< div class = "line" > < a name = "l00408" > < / a > < span class = "lineno" > 408< / span >   }< / div >
< div class = "line" > < a name = "l00409" > < / a > < span class = "lineno" > 409< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00410" > < / a > < span class = "lineno" > 410< / span >   }< / div >
< div class = "line" > < a name = "l00411" > < / a > < span class = "lineno" > 411< / span >   < / div >
< div class = "line" > < a name = "l00412" > < / a > < span class = "lineno" > 412< / span >   < span class = "comment" > // Advance to the first set of |num_bits| bits that match |start_code|. |offset|< / span > < / div >
< div class = "line" > < a name = "l00413" > < / a > < span class = "lineno" > 413< / span >   < span class = "comment" > // is the current location in the buffer, and is updated. |bytes_needed| is the< / span > < / div >
< div class = "line" > < a name = "l00414" > < / a > < span class = "lineno" > 414< / span >   < span class = "comment" > // number of bytes that must remain in the buffer when |start_code| is found.< / span > < / div >
< div class = "line" > < a name = "l00415" > < / a > < span class = "lineno" > 415< / span >   < span class = "comment" > // Returns true if start_code found (and enough space in the buffer after it),< / span > < / div >
< div class = "line" > < a name = "l00416" > < / a > < span class = "lineno" > 416< / span >   < span class = "comment" > // false otherwise.< / span > < / div >
< div class = "line" > < a name = "l00417" > < / a > < span class = "lineno" > 417< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > AdvanceToStartCode(< span class = "keyword" > const< / span > uint8_t* buffer,< / div >
< div class = "line" > < a name = "l00418" > < / a > < span class = "lineno" > 418< / span >   < span class = "keywordtype" > int< / span > buffer_size,< / div >
< div class = "line" > < a name = "l00419" > < / a > < span class = "lineno" > 419< / span >   < span class = "keywordtype" > int< / span > * offset,< / div >
< div class = "line" > < a name = "l00420" > < / a > < span class = "lineno" > 420< / span >   < span class = "keywordtype" > int< / span > bytes_needed,< / div >
< div class = "line" > < a name = "l00421" > < / a > < span class = "lineno" > 421< / span >   < span class = "keywordtype" > int< / span > num_bits,< / div >
< div class = "line" > < a name = "l00422" > < / a > < span class = "lineno" > 422< / span >   uint32_t start_code) {< / div >
< div class = "line" > < a name = "l00423" > < / a > < span class = "lineno" > 423< / span >   DCHECK_GE(bytes_needed, 3);< / div >
< div class = "line" > < a name = "l00424" > < / a > < span class = "lineno" > 424< / span >   DCHECK_LE(num_bits, 24); < span class = "comment" > // Only supports up to 24 bits.< / span > < / div >
< div class = "line" > < a name = "l00425" > < / a > < span class = "lineno" > 425< / span >   < / div >
< div class = "line" > < a name = "l00426" > < / a > < span class = "lineno" > 426< / span >   < span class = "comment" > // Create a mask to isolate |num_bits| bits, once shifted over.< / span > < / div >
< div class = "line" > < a name = "l00427" > < / a > < span class = "lineno" > 427< / span >   uint32_t bits_to_shift = 24 - num_bits;< / div >
< div class = "line" > < a name = "l00428" > < / a > < span class = "lineno" > 428< / span >   uint32_t mask = (1 < < num_bits) - 1;< / div >
< div class = "line" > < a name = "l00429" > < / a > < span class = "lineno" > 429< / span >   < span class = "keywordflow" > while< / span > (*offset + bytes_needed < buffer_size) {< / div >
< div class = "line" > < a name = "l00430" > < / a > < span class = "lineno" > 430< / span >   uint32_t next = Read24(buffer + *offset);< / div >
< div class = "line" > < a name = "l00431" > < / a > < span class = "lineno" > 431< / span >   < span class = "keywordflow" > if< / span > (((next > > bits_to_shift) & mask) == start_code)< / div >
< div class = "line" > < a name = "l00432" > < / a > < span class = "lineno" > 432< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00433" > < / a > < span class = "lineno" > 433< / span >   ++(*offset);< / div >
< div class = "line" > < a name = "l00434" > < / a > < span class = "lineno" > 434< / span >   }< / div >
< div class = "line" > < a name = "l00435" > < / a > < span class = "lineno" > 435< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00436" > < / a > < span class = "lineno" > 436< / span >   }< / div >
< div class = "line" > < a name = "l00437" > < / a > < span class = "lineno" > 437< / span >   < / div >
< div class = "line" > < a name = "l00438" > < / a > < span class = "lineno" > 438< / span >   < span class = "comment" > // Checks for an H.261 container.< / span > < / div >
< div class = "line" > < a name = "l00439" > < / a > < span class = "lineno" > 439< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckH261(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00440" > < / a > < span class = "lineno" > 440< / span >   < span class = "comment" > // Reference: ITU-T Recommendation H.261 (03/1993)< / span > < / div >
< div class = "line" > < a name = "l00441" > < / a > < span class = "lineno" > 441< / span >   < span class = "comment" > // (http://www.itu.int/rec/T-REC-H.261-199303-I/en)< / span > < / div >
< div class = "line" > < a name = "l00442" > < / a > < span class = "lineno" > 442< / span >   RCHECK(buffer_size > 16);< / div >
< div class = "line" > < a name = "l00443" > < / a > < span class = "lineno" > 443< / span >   < / div >
< div class = "line" > < a name = "l00444" > < / a > < span class = "lineno" > 444< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00445" > < / a > < span class = "lineno" > 445< / span >   < span class = "keywordtype" > bool< / span > seen_start_code = < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00446" > < / a > < span class = "lineno" > 446< / span >   < span class = "keywordflow" > while< / span > (< span class = "keyword" > true< / span > ) {< / div >
< div class = "line" > < a name = "l00447" > < / a > < span class = "lineno" > 447< / span >   < span class = "comment" > // Advance to picture_start_code, if there is one.< / span > < / div >
< div class = "line" > < a name = "l00448" > < / a > < span class = "lineno" > 448< / span >   < span class = "keywordflow" > if< / span > (!AdvanceToStartCode(buffer, buffer_size, & offset, 4, 20, 0x10)) {< / div >
< div class = "line" > < a name = "l00449" > < / a > < span class = "lineno" > 449< / span >   < span class = "comment" > // No start code found (or off end of buffer), so success if< / span > < / div >
< div class = "line" > < a name = "l00450" > < / a > < span class = "lineno" > 450< / span >   < span class = "comment" > // there was at least one valid header.< / span > < / div >
< div class = "line" > < a name = "l00451" > < / a > < span class = "lineno" > 451< / span >   < span class = "keywordflow" > return< / span > seen_start_code;< / div >
< div class = "line" > < a name = "l00452" > < / a > < span class = "lineno" > 452< / span >   }< / div >
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< div class = "line" > < a name = "l00453" > < / a > < span class = "lineno" > 453< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00454" > < / a > < span class = "lineno" > 454< / span >   < span class = "comment" > // Now verify the block. AdvanceToStartCode() made sure that there are< / span > < / div >
< div class = "line" > < a name = "l00455" > < / a > < span class = "lineno" > 455< / span >   < span class = "comment" > // at least 4 bytes remaining in the buffer.< / span > < / div >
< div class = "line" > < a name = "l00456" > < / a > < span class = "lineno" > 456< / span >   BitReader reader(buffer + offset, buffer_size - offset);< / div >
< div class = "line" > < a name = "l00457" > < / a > < span class = "lineno" > 457< / span >   RCHECK(ReadBits(& reader, 20) == 0x10);< / div >
< div class = "line" > < a name = "l00458" > < / a > < span class = "lineno" > 458< / span >   < / div >
< div class = "line" > < a name = "l00459" > < / a > < span class = "lineno" > 459< / span >   < span class = "comment" > // Skip the temporal reference and PTYPE.< / span > < / div >
< div class = "line" > < a name = "l00460" > < / a > < span class = "lineno" > 460< / span >   reader.SkipBits(5 + 6);< / div >
< div class = "line" > < a name = "l00461" > < / a > < span class = "lineno" > 461< / span >   < / div >
< div class = "line" > < a name = "l00462" > < / a > < span class = "lineno" > 462< / span >   < span class = "comment" > // Skip any extra insertion information. Since this is open-ended, if we run< / span > < / div >
< div class = "line" > < a name = "l00463" > < / a > < span class = "lineno" > 463< / span >   < span class = "comment" > // out of bits assume that the buffer is correctly formatted.< / span > < / div >
< div class = "line" > < a name = "l00464" > < / a > < span class = "lineno" > 464< / span >   < span class = "keywordtype" > int< / span > extra = ReadBits(& reader, 1);< / div >
< div class = "line" > < a name = "l00465" > < / a > < span class = "lineno" > 465< / span >   < span class = "keywordflow" > while< / span > (extra == 1) {< / div >
< div class = "line" > < a name = "l00466" > < / a > < span class = "lineno" > 466< / span >   < span class = "keywordflow" > if< / span > (!reader.SkipBits(8))< / div >
< div class = "line" > < a name = "l00467" > < / a > < span class = "lineno" > 467< / span >   < span class = "keywordflow" > return< / span > seen_start_code;< / div >
< div class = "line" > < a name = "l00468" > < / a > < span class = "lineno" > 468< / span >   < span class = "keywordflow" > if< / span > (!reader.ReadBits(1, & extra))< / div >
< div class = "line" > < a name = "l00469" > < / a > < span class = "lineno" > 469< / span >   < span class = "keywordflow" > return< / span > seen_start_code;< / div >
< div class = "line" > < a name = "l00470" > < / a > < span class = "lineno" > 470< / span >   }< / div >
< div class = "line" > < a name = "l00471" > < / a > < span class = "lineno" > 471< / span >   < / div >
< div class = "line" > < a name = "l00472" > < / a > < span class = "lineno" > 472< / span >   < span class = "comment" > // Next should be a Group of Blocks start code. Again, if we run out of< / span > < / div >
< div class = "line" > < a name = "l00473" > < / a > < span class = "lineno" > 473< / span >   < span class = "comment" > // bits, then assume that the buffer up to here is correct, and the buffer< / span > < / div >
< div class = "line" > < a name = "l00474" > < / a > < span class = "lineno" > 474< / span >   < span class = "comment" > // just happened to end in the middle of a header.< / span > < / div >
< div class = "line" > < a name = "l00475" > < / a > < span class = "lineno" > 475< / span >   < span class = "keywordtype" > int< / span > next;< / div >
< div class = "line" > < a name = "l00476" > < / a > < span class = "lineno" > 476< / span >   < span class = "keywordflow" > if< / span > (!reader.ReadBits(16, & next))< / div >
< div class = "line" > < a name = "l00477" > < / a > < span class = "lineno" > 477< / span >   < span class = "keywordflow" > return< / span > seen_start_code;< / div >
< div class = "line" > < a name = "l00478" > < / a > < span class = "lineno" > 478< / span >   RCHECK(next == 1);< / div >
< div class = "line" > < a name = "l00479" > < / a > < span class = "lineno" > 479< / span >   < / div >
< div class = "line" > < a name = "l00480" > < / a > < span class = "lineno" > 480< / span >   < span class = "comment" > // Move to the next block.< / span > < / div >
< div class = "line" > < a name = "l00481" > < / a > < span class = "lineno" > 481< / span >   seen_start_code = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00482" > < / a > < span class = "lineno" > 482< / span >   offset += 4;< / div >
< div class = "line" > < a name = "l00483" > < / a > < span class = "lineno" > 483< / span >   }< / div >
< div class = "line" > < a name = "l00484" > < / a > < span class = "lineno" > 484< / span >   }< / div >
< div class = "line" > < a name = "l00485" > < / a > < span class = "lineno" > 485< / span >   < / div >
< div class = "line" > < a name = "l00486" > < / a > < span class = "lineno" > 486< / span >   < span class = "comment" > // Checks for an H.263 container.< / span > < / div >
< div class = "line" > < a name = "l00487" > < / a > < span class = "lineno" > 487< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckH263(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00488" > < / a > < span class = "lineno" > 488< / span >   < span class = "comment" > // Reference: ITU-T Recommendation H.263 (01/2005)< / span > < / div >
< div class = "line" > < a name = "l00489" > < / a > < span class = "lineno" > 489< / span >   < span class = "comment" > // (http://www.itu.int/rec/T-REC-H.263-200501-I/en)< / span > < / div >
< div class = "line" > < a name = "l00490" > < / a > < span class = "lineno" > 490< / span >   < span class = "comment" > // header is PSC(22b) + TR(8b) + PTYPE(8+b).< / span > < / div >
< div class = "line" > < a name = "l00491" > < / a > < span class = "lineno" > 491< / span >   RCHECK(buffer_size > 16);< / div >
< div class = "line" > < a name = "l00492" > < / a > < span class = "lineno" > 492< / span >   < / div >
< div class = "line" > < a name = "l00493" > < / a > < span class = "lineno" > 493< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00494" > < / a > < span class = "lineno" > 494< / span >   < span class = "keywordtype" > bool< / span > seen_start_code = < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00495" > < / a > < span class = "lineno" > 495< / span >   < span class = "keywordflow" > while< / span > (< span class = "keyword" > true< / span > ) {< / div >
< div class = "line" > < a name = "l00496" > < / a > < span class = "lineno" > 496< / span >   < span class = "comment" > // Advance to picture_start_code, if there is one.< / span > < / div >
< div class = "line" > < a name = "l00497" > < / a > < span class = "lineno" > 497< / span >   < span class = "keywordflow" > if< / span > (!AdvanceToStartCode(buffer, buffer_size, & offset, 9, 22, 0x20)) {< / div >
< div class = "line" > < a name = "l00498" > < / a > < span class = "lineno" > 498< / span >   < span class = "comment" > // No start code found (or off end of buffer), so success if< / span > < / div >
< div class = "line" > < a name = "l00499" > < / a > < span class = "lineno" > 499< / span >   < span class = "comment" > // there was at least one valid header.< / span > < / div >
< div class = "line" > < a name = "l00500" > < / a > < span class = "lineno" > 500< / span >   < span class = "keywordflow" > return< / span > seen_start_code;< / div >
< div class = "line" > < a name = "l00501" > < / a > < span class = "lineno" > 501< / span >   }< / div >
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< div class = "line" > < a name = "l00502" > < / a > < span class = "lineno" > 502< / span >   < / div >
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< div class = "line" > < a name = "l00503" > < / a > < span class = "lineno" > 503< / span >   < span class = "comment" > // Now verify the block. AdvanceToStartCode() made sure that there are< / span > < / div >
< div class = "line" > < a name = "l00504" > < / a > < span class = "lineno" > 504< / span >   < span class = "comment" > // at least 9 bytes remaining in the buffer.< / span > < / div >
< div class = "line" > < a name = "l00505" > < / a > < span class = "lineno" > 505< / span >   BitReader reader(buffer + offset, 9);< / div >
< div class = "line" > < a name = "l00506" > < / a > < span class = "lineno" > 506< / span >   RCHECK(ReadBits(& reader, 22) == 0x20);< / div >
< div class = "line" > < a name = "l00507" > < / a > < span class = "lineno" > 507< / span >   < / div >
< div class = "line" > < a name = "l00508" > < / a > < span class = "lineno" > 508< / span >   < span class = "comment" > // Skip the temporal reference.< / span > < / div >
< div class = "line" > < a name = "l00509" > < / a > < span class = "lineno" > 509< / span >   reader.SkipBits(8);< / div >
< div class = "line" > < a name = "l00510" > < / a > < span class = "lineno" > 510< / span >   < / div >
< div class = "line" > < a name = "l00511" > < / a > < span class = "lineno" > 511< / span >   < span class = "comment" > // Verify that the first 2 bits of PTYPE are 10b.< / span > < / div >
< div class = "line" > < a name = "l00512" > < / a > < span class = "lineno" > 512< / span >   RCHECK(ReadBits(& reader, 2) == 2);< / div >
< div class = "line" > < a name = "l00513" > < / a > < span class = "lineno" > 513< / span >   < / div >
< div class = "line" > < a name = "l00514" > < / a > < span class = "lineno" > 514< / span >   < span class = "comment" > // Skip the split screen indicator, document camera indicator, and full< / span > < / div >
< div class = "line" > < a name = "l00515" > < / a > < span class = "lineno" > 515< / span >   < span class = "comment" > // picture freeze release.< / span > < / div >
< div class = "line" > < a name = "l00516" > < / a > < span class = "lineno" > 516< / span >   reader.SkipBits(1 + 1 + 1);< / div >
< div class = "line" > < a name = "l00517" > < / a > < span class = "lineno" > 517< / span >   < / div >
< div class = "line" > < a name = "l00518" > < / a > < span class = "lineno" > 518< / span >   < span class = "comment" > // Verify Source Format.< / span > < / div >
< div class = "line" > < a name = "l00519" > < / a > < span class = "lineno" > 519< / span >   < span class = "keywordtype" > int< / span > format = ReadBits(& reader, 3);< / div >
< div class = "line" > < a name = "l00520" > < / a > < span class = "lineno" > 520< / span >   RCHECK(format != 0 & & format != 6); < span class = "comment" > // Forbidden or reserved.< / span > < / div >
< div class = "line" > < a name = "l00521" > < / a > < span class = "lineno" > 521< / span >   < / div >
< div class = "line" > < a name = "l00522" > < / a > < span class = "lineno" > 522< / span >   < span class = "keywordflow" > if< / span > (format == 7) {< / div >
< div class = "line" > < a name = "l00523" > < / a > < span class = "lineno" > 523< / span >   < span class = "comment" > // Verify full extended PTYPE.< / span > < / div >
< div class = "line" > < a name = "l00524" > < / a > < span class = "lineno" > 524< / span >   < span class = "keywordtype" > int< / span > ufep = ReadBits(& reader, 3);< / div >
< div class = "line" > < a name = "l00525" > < / a > < span class = "lineno" > 525< / span >   < span class = "keywordflow" > if< / span > (ufep == 1) {< / div >
< div class = "line" > < a name = "l00526" > < / a > < span class = "lineno" > 526< / span >   < span class = "comment" > // Verify the optional part of PLUSPTYPE.< / span > < / div >
< div class = "line" > < a name = "l00527" > < / a > < span class = "lineno" > 527< / span >   format = ReadBits(& reader, 3);< / div >
< div class = "line" > < a name = "l00528" > < / a > < span class = "lineno" > 528< / span >   RCHECK(format != 0 & & format != 7); < span class = "comment" > // Reserved.< / span > < / div >
< div class = "line" > < a name = "l00529" > < / a > < span class = "lineno" > 529< / span >   reader.SkipBits(11);< / div >
< div class = "line" > < a name = "l00530" > < / a > < span class = "lineno" > 530< / span >   < span class = "comment" > // Next 4 bits should be b1000.< / span > < / div >
< div class = "line" > < a name = "l00531" > < / a > < span class = "lineno" > 531< / span >   RCHECK(ReadBits(& reader, 4) == 8); < span class = "comment" > // Not allowed.< / span > < / div >
< div class = "line" > < a name = "l00532" > < / a > < span class = "lineno" > 532< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00533" > < / a > < span class = "lineno" > 533< / span >   RCHECK(ufep == 0); < span class = "comment" > // Only 0 and 1 allowed.< / span > < / div >
< div class = "line" > < a name = "l00534" > < / a > < span class = "lineno" > 534< / span >   }< / div >
< div class = "line" > < a name = "l00535" > < / a > < span class = "lineno" > 535< / span >   < / div >
< div class = "line" > < a name = "l00536" > < / a > < span class = "lineno" > 536< / span >   < span class = "comment" > // Verify picture type code is not a reserved value.< / span > < / div >
< div class = "line" > < a name = "l00537" > < / a > < span class = "lineno" > 537< / span >   < span class = "keywordtype" > int< / span > picture_type_code = ReadBits(& reader, 3);< / div >
< div class = "line" > < a name = "l00538" > < / a > < span class = "lineno" > 538< / span >   RCHECK(picture_type_code != 6 & & picture_type_code != 7); < span class = "comment" > // Reserved.< / span > < / div >
< div class = "line" > < a name = "l00539" > < / a > < span class = "lineno" > 539< / span >   < / div >
< div class = "line" > < a name = "l00540" > < / a > < span class = "lineno" > 540< / span >   < span class = "comment" > // Skip picture resampling mode, reduced resolution mode,< / span > < / div >
< div class = "line" > < a name = "l00541" > < / a > < span class = "lineno" > 541< / span >   < span class = "comment" > // and rounding type.< / span > < / div >
< div class = "line" > < a name = "l00542" > < / a > < span class = "lineno" > 542< / span >   reader.SkipBits(1 + 1 + 1);< / div >
< div class = "line" > < a name = "l00543" > < / a > < span class = "lineno" > 543< / span >   < / div >
< div class = "line" > < a name = "l00544" > < / a > < span class = "lineno" > 544< / span >   < span class = "comment" > // Next 3 bits should be b001.< / span > < / div >
< div class = "line" > < a name = "l00545" > < / a > < span class = "lineno" > 545< / span >   RCHECK(ReadBits(& reader, 3) == 1); < span class = "comment" > // Not allowed.< / span > < / div >
< div class = "line" > < a name = "l00546" > < / a > < span class = "lineno" > 546< / span >   }< / div >
< div class = "line" > < a name = "l00547" > < / a > < span class = "lineno" > 547< / span >   < / div >
< div class = "line" > < a name = "l00548" > < / a > < span class = "lineno" > 548< / span >   < span class = "comment" > // Move to the next block.< / span > < / div >
< div class = "line" > < a name = "l00549" > < / a > < span class = "lineno" > 549< / span >   seen_start_code = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00550" > < / a > < span class = "lineno" > 550< / span >   offset += 9;< / div >
< div class = "line" > < a name = "l00551" > < / a > < span class = "lineno" > 551< / span >   }< / div >
< div class = "line" > < a name = "l00552" > < / a > < span class = "lineno" > 552< / span >   }< / div >
< div class = "line" > < a name = "l00553" > < / a > < span class = "lineno" > 553< / span >   < / div >
< div class = "line" > < a name = "l00554" > < / a > < span class = "lineno" > 554< / span >   < span class = "comment" > // Checks for an H.264 container.< / span > < / div >
< div class = "line" > < a name = "l00555" > < / a > < span class = "lineno" > 555< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckH264(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00556" > < / a > < span class = "lineno" > 556< / span >   < span class = "comment" > // Reference: ITU-T Recommendation H.264 (01/2012)< / span > < / div >
< div class = "line" > < a name = "l00557" > < / a > < span class = "lineno" > 557< / span >   < span class = "comment" > // (http://www.itu.int/rec/T-REC-H.264)< / span > < / div >
< div class = "line" > < a name = "l00558" > < / a > < span class = "lineno" > 558< / span >   < span class = "comment" > // Section B.1: Byte stream NAL unit syntax and semantics.< / span > < / div >
< div class = "line" > < a name = "l00559" > < / a > < span class = "lineno" > 559< / span >   RCHECK(buffer_size > 4);< / div >
< div class = "line" > < a name = "l00560" > < / a > < span class = "lineno" > 560< / span >   < / div >
< div class = "line" > < a name = "l00561" > < / a > < span class = "lineno" > 561< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00562" > < / a > < span class = "lineno" > 562< / span >   < span class = "keywordtype" > int< / span > parameter_count = 0;< / div >
< div class = "line" > < a name = "l00563" > < / a > < span class = "lineno" > 563< / span >   < span class = "keywordflow" > while< / span > (< span class = "keyword" > true< / span > ) {< / div >
< div class = "line" > < a name = "l00564" > < / a > < span class = "lineno" > 564< / span >   < span class = "comment" > // Advance to picture_start_code, if there is one.< / span > < / div >
< div class = "line" > < a name = "l00565" > < / a > < span class = "lineno" > 565< / span >   < span class = "keywordflow" > if< / span > (!AdvanceToStartCode(buffer, buffer_size, & offset, 4, 24, 1)) {< / div >
< div class = "line" > < a name = "l00566" > < / a > < span class = "lineno" > 566< / span >   < span class = "comment" > // No start code found (or off end of buffer), so success if< / span > < / div >
< div class = "line" > < a name = "l00567" > < / a > < span class = "lineno" > 567< / span >   < span class = "comment" > // there was at least one valid header.< / span > < / div >
< div class = "line" > < a name = "l00568" > < / a > < span class = "lineno" > 568< / span >   < span class = "keywordflow" > return< / span > parameter_count > 0;< / div >
< div class = "line" > < a name = "l00569" > < / a > < span class = "lineno" > 569< / span >   }< / div >
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< div class = "line" > < a name = "l00570" > < / a > < span class = "lineno" > 570< / span >   < / div >
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< div class = "line" > < a name = "l00571" > < / a > < span class = "lineno" > 571< / span >   < span class = "comment" > // Now verify the block. AdvanceToStartCode() made sure that there are< / span > < / div >
< div class = "line" > < a name = "l00572" > < / a > < span class = "lineno" > 572< / span >   < span class = "comment" > // at least 4 bytes remaining in the buffer.< / span > < / div >
< div class = "line" > < a name = "l00573" > < / a > < span class = "lineno" > 573< / span >   BitReader reader(buffer + offset, 4);< / div >
< div class = "line" > < a name = "l00574" > < / a > < span class = "lineno" > 574< / span >   RCHECK(ReadBits(& reader, 24) == 1);< / div >
< div class = "line" > < a name = "l00575" > < / a > < span class = "lineno" > 575< / span >   < / div >
< div class = "line" > < a name = "l00576" > < / a > < span class = "lineno" > 576< / span >   < span class = "comment" > // Verify forbidden_zero_bit.< / span > < / div >
< div class = "line" > < a name = "l00577" > < / a > < span class = "lineno" > 577< / span >   RCHECK(ReadBits(& reader, 1) == 0);< / div >
< div class = "line" > < a name = "l00578" > < / a > < span class = "lineno" > 578< / span >   < / div >
< div class = "line" > < a name = "l00579" > < / a > < span class = "lineno" > 579< / span >   < span class = "comment" > // Extract nal_ref_idc and nal_unit_type.< / span > < / div >
< div class = "line" > < a name = "l00580" > < / a > < span class = "lineno" > 580< / span >   < span class = "keywordtype" > int< / span > nal_ref_idc = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l00581" > < / a > < span class = "lineno" > 581< / span >   < span class = "keywordtype" > int< / span > nal_unit_type = ReadBits(& reader, 5);< / div >
< div class = "line" > < a name = "l00582" > < / a > < span class = "lineno" > 582< / span >   < / div >
< div class = "line" > < a name = "l00583" > < / a > < span class = "lineno" > 583< / span >   < span class = "keywordflow" > switch< / span > (nal_unit_type) {< / div >
< div class = "line" > < a name = "l00584" > < / a > < span class = "lineno" > 584< / span >   < span class = "keywordflow" > case< / span > 5: < span class = "comment" > // Coded slice of an IDR picture.< / span > < / div >
< div class = "line" > < a name = "l00585" > < / a > < span class = "lineno" > 585< / span >   RCHECK(nal_ref_idc != 0);< / div >
< div class = "line" > < a name = "l00586" > < / a > < span class = "lineno" > 586< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00587" > < / a > < span class = "lineno" > 587< / span >   < span class = "keywordflow" > case< / span > 6: < span class = "comment" > // Supplemental enhancement information (SEI).< / span > < / div >
< div class = "line" > < a name = "l00588" > < / a > < span class = "lineno" > 588< / span >   < span class = "keywordflow" > case< / span > 9: < span class = "comment" > // Access unit delimiter.< / span > < / div >
< div class = "line" > < a name = "l00589" > < / a > < span class = "lineno" > 589< / span >   < span class = "keywordflow" > case< / span > 10: < span class = "comment" > // End of sequence.< / span > < / div >
< div class = "line" > < a name = "l00590" > < / a > < span class = "lineno" > 590< / span >   < span class = "keywordflow" > case< / span > 11: < span class = "comment" > // End of stream.< / span > < / div >
< div class = "line" > < a name = "l00591" > < / a > < span class = "lineno" > 591< / span >   < span class = "keywordflow" > case< / span > 12: < span class = "comment" > // Filler data.< / span > < / div >
< div class = "line" > < a name = "l00592" > < / a > < span class = "lineno" > 592< / span >   RCHECK(nal_ref_idc == 0);< / div >
< div class = "line" > < a name = "l00593" > < / a > < span class = "lineno" > 593< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00594" > < / a > < span class = "lineno" > 594< / span >   < span class = "keywordflow" > case< / span > 7: < span class = "comment" > // Sequence parameter set.< / span > < / div >
< div class = "line" > < a name = "l00595" > < / a > < span class = "lineno" > 595< / span >   < span class = "keywordflow" > case< / span > 8: < span class = "comment" > // Picture parameter set.< / span > < / div >
< div class = "line" > < a name = "l00596" > < / a > < span class = "lineno" > 596< / span >   ++parameter_count;< / div >
< div class = "line" > < a name = "l00597" > < / a > < span class = "lineno" > 597< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00598" > < / a > < span class = "lineno" > 598< / span >   }< / div >
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< div class = "line" > < a name = "l00599" > < / a > < span class = "lineno" > 599< / span >   < / div >
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< div class = "line" > < a name = "l00600" > < / a > < span class = "lineno" > 600< / span >   < span class = "comment" > // Skip the current start_code_prefix and move to the next.< / span > < / div >
< div class = "line" > < a name = "l00601" > < / a > < span class = "lineno" > 601< / span >   offset += 4;< / div >
< div class = "line" > < a name = "l00602" > < / a > < span class = "lineno" > 602< / span >   }< / div >
< div class = "line" > < a name = "l00603" > < / a > < span class = "lineno" > 603< / span >   }< / div >
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< div class = "line" > < a name = "l00604" > < / a > < span class = "lineno" > 604< / span >   < / div >
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< div class = "line" > < a name = "l00605" > < / a > < span class = "lineno" > 605< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kHlsSignature[] = < span class = "stringliteral" > " #EXTM3U" < / span > ;< / div >
< div class = "line" > < a name = "l00606" > < / a > < span class = "lineno" > 606< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kHls1[] = < span class = "stringliteral" > " #EXT-X-STREAM-INF:" < / span > ;< / div >
< div class = "line" > < a name = "l00607" > < / a > < span class = "lineno" > 607< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kHls2[] = < span class = "stringliteral" > " #EXT-X-TARGETDURATION:" < / span > ;< / div >
< div class = "line" > < a name = "l00608" > < / a > < span class = "lineno" > 608< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kHls3[] = < span class = "stringliteral" > " #EXT-X-MEDIA-SEQUENCE:" < / span > ;< / div >
< div class = "line" > < a name = "l00609" > < / a > < span class = "lineno" > 609< / span >   < / div >
< div class = "line" > < a name = "l00610" > < / a > < span class = "lineno" > 610< / span >   < span class = "comment" > // Additional checks for a HLS container.< / span > < / div >
< div class = "line" > < a name = "l00611" > < / a > < span class = "lineno" > 611< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckHls(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00612" > < / a > < span class = "lineno" > 612< / span >   < span class = "comment" > // HLS is simply a play list used for Apple HTTP Live Streaming.< / span > < / div >
< div class = "line" > < a name = "l00613" > < / a > < span class = "lineno" > 613< / span >   < span class = "comment" > // Reference: Apple HTTP Live Streaming Overview< / span > < / div >
< div class = "line" > < a name = "l00614" > < / a > < span class = "lineno" > 614< / span >   < span class = "comment" > // (http://goo.gl/MIwxj)< / span > < / div >
< div class = "line" > < a name = "l00615" > < / a > < span class = "lineno" > 615< / span >   < / div >
< div class = "line" > < a name = "l00616" > < / a > < span class = "lineno" > 616< / span >   < span class = "keywordflow" > if< / span > (StartsWith(buffer, buffer_size, kHlsSignature)) {< / div >
< div class = "line" > < a name = "l00617" > < / a > < span class = "lineno" > 617< / span >   < span class = "comment" > // Need to find " #EXT-X-STREAM-INF:" , " #EXT-X-TARGETDURATION:" , or< / span > < / div >
< div class = "line" > < a name = "l00618" > < / a > < span class = "lineno" > 618< / span >   < span class = "comment" > // " #EXT-X-MEDIA-SEQUENCE:" somewhere in the buffer. Other playlists (like< / span > < / div >
< div class = "line" > < a name = "l00619" > < / a > < span class = "lineno" > 619< / span >   < span class = "comment" > // WinAmp) only have additional lines with #EXTINF< / span > < / div >
< div class = "line" > < a name = "l00620" > < / a > < span class = "lineno" > 620< / span >   < span class = "comment" > // (http://en.wikipedia.org/wiki/M3U).< / span > < / div >
< div class = "line" > < a name = "l00621" > < / a > < span class = "lineno" > 621< / span >   < span class = "keywordtype" > int< / span > offset = strlen(kHlsSignature);< / div >
< div class = "line" > < a name = "l00622" > < / a > < span class = "lineno" > 622< / span >   < span class = "keywordflow" > while< / span > (offset < buffer_size) {< / div >
< div class = "line" > < a name = "l00623" > < / a > < span class = "lineno" > 623< / span >   < span class = "keywordflow" > if< / span > (buffer[offset] == < span class = "charliteral" > ' #' < / span > ) {< / div >
< div class = "line" > < a name = "l00624" > < / a > < span class = "lineno" > 624< / span >   < span class = "keywordflow" > if< / span > (StartsWith(buffer + offset, buffer_size - offset, kHls1) ||< / div >
< div class = "line" > < a name = "l00625" > < / a > < span class = "lineno" > 625< / span >   StartsWith(buffer + offset, buffer_size - offset, kHls2) ||< / div >
< div class = "line" > < a name = "l00626" > < / a > < span class = "lineno" > 626< / span >   StartsWith(buffer + offset, buffer_size - offset, kHls3)) {< / div >
< div class = "line" > < a name = "l00627" > < / a > < span class = "lineno" > 627< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00628" > < / a > < span class = "lineno" > 628< / span >   }< / div >
< div class = "line" > < a name = "l00629" > < / a > < span class = "lineno" > 629< / span >   }< / div >
< div class = "line" > < a name = "l00630" > < / a > < span class = "lineno" > 630< / span >   ++offset;< / div >
< div class = "line" > < a name = "l00631" > < / a > < span class = "lineno" > 631< / span >   }< / div >
< div class = "line" > < a name = "l00632" > < / a > < span class = "lineno" > 632< / span >   }< / div >
< div class = "line" > < a name = "l00633" > < / a > < span class = "lineno" > 633< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00634" > < / a > < span class = "lineno" > 634< / span >   }< / div >
< div class = "line" > < a name = "l00635" > < / a > < span class = "lineno" > 635< / span >   < / div >
< div class = "line" > < a name = "l00636" > < / a > < span class = "lineno" > 636< / span >   < span class = "comment" > // Checks for a MJPEG stream.< / span > < / div >
< div class = "line" > < a name = "l00637" > < / a > < span class = "lineno" > 637< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckMJpeg(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00638" > < / a > < span class = "lineno" > 638< / span >   < span class = "comment" > // Reference: ISO/IEC 10918-1 : 1993(E), Annex B< / span > < / div >
< div class = "line" > < a name = "l00639" > < / a > < span class = "lineno" > 639< / span >   < span class = "comment" > // (http://www.w3.org/Graphics/JPEG/itu-t81.pdf)< / span > < / div >
< div class = "line" > < a name = "l00640" > < / a > < span class = "lineno" > 640< / span >   RCHECK(buffer_size > = 16);< / div >
< div class = "line" > < a name = "l00641" > < / a > < span class = "lineno" > 641< / span >   < / div >
< div class = "line" > < a name = "l00642" > < / a > < span class = "lineno" > 642< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00643" > < / a > < span class = "lineno" > 643< / span >   < span class = "keywordtype" > int< / span > last_restart = -1;< / div >
< div class = "line" > < a name = "l00644" > < / a > < span class = "lineno" > 644< / span >   < span class = "keywordtype" > int< / span > num_codes = 0;< / div >
< div class = "line" > < a name = "l00645" > < / a > < span class = "lineno" > 645< / span >   < span class = "keywordflow" > while< / span > (offset + 5 < buffer_size) {< / div >
< div class = "line" > < a name = "l00646" > < / a > < span class = "lineno" > 646< / span >   < span class = "comment" > // Marker codes are always a two byte code with the first byte xFF.< / span > < / div >
< div class = "line" > < a name = "l00647" > < / a > < span class = "lineno" > 647< / span >   RCHECK(buffer[offset] == 0xff);< / div >
< div class = "line" > < a name = "l00648" > < / a > < span class = "lineno" > 648< / span >   uint8_t code = buffer[offset + 1];< / div >
< div class = "line" > < a name = "l00649" > < / a > < span class = "lineno" > 649< / span >   RCHECK(code > = 0xc0 || code == 1);< / div >
< div class = "line" > < a name = "l00650" > < / a > < span class = "lineno" > 650< / span >   < / div >
< div class = "line" > < a name = "l00651" > < / a > < span class = "lineno" > 651< / span >   < span class = "comment" > // Skip sequences of xFF.< / span > < / div >
< div class = "line" > < a name = "l00652" > < / a > < span class = "lineno" > 652< / span >   < span class = "keywordflow" > if< / span > (code == 0xff) {< / div >
< div class = "line" > < a name = "l00653" > < / a > < span class = "lineno" > 653< / span >   ++offset;< / div >
< div class = "line" > < a name = "l00654" > < / a > < span class = "lineno" > 654< / span >   < span class = "keywordflow" > continue< / span > ;< / div >
< div class = "line" > < a name = "l00655" > < / a > < span class = "lineno" > 655< / span >   }< / div >
< div class = "line" > < a name = "l00656" > < / a > < span class = "lineno" > 656< / span >   < / div >
< div class = "line" > < a name = "l00657" > < / a > < span class = "lineno" > 657< / span >   < span class = "comment" > // Success if the next marker code is EOI (end of image)< / span > < / div >
< div class = "line" > < a name = "l00658" > < / a > < span class = "lineno" > 658< / span >   < span class = "keywordflow" > if< / span > (code == 0xd9)< / div >
< div class = "line" > < a name = "l00659" > < / a > < span class = "lineno" > 659< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00660" > < / a > < span class = "lineno" > 660< / span >   < / div >
< div class = "line" > < a name = "l00661" > < / a > < span class = "lineno" > 661< / span >   < span class = "comment" > // Check remaining codes.< / span > < / div >
< div class = "line" > < a name = "l00662" > < / a > < span class = "lineno" > 662< / span >   < span class = "keywordflow" > if< / span > (code == 0xd8 || code == 1) {< / div >
< div class = "line" > < a name = "l00663" > < / a > < span class = "lineno" > 663< / span >   < span class = "comment" > // SOI (start of image) / TEM (private use). No other data with header.< / span > < / div >
< div class = "line" > < a name = "l00664" > < / a > < span class = "lineno" > 664< / span >   offset += 2;< / div >
< div class = "line" > < a name = "l00665" > < / a > < span class = "lineno" > 665< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (code > = 0xd0 & & code < = 0xd7) {< / div >
< div class = "line" > < a name = "l00666" > < / a > < span class = "lineno" > 666< / span >   < span class = "comment" > // RST (restart) codes must be in sequence. No other data with header.< / span > < / div >
< div class = "line" > < a name = "l00667" > < / a > < span class = "lineno" > 667< / span >   < span class = "keywordtype" > int< / span > restart = code & 0x07;< / div >
< div class = "line" > < a name = "l00668" > < / a > < span class = "lineno" > 668< / span >   < span class = "keywordflow" > if< / span > (last_restart > = 0)< / div >
< div class = "line" > < a name = "l00669" > < / a > < span class = "lineno" > 669< / span >   RCHECK(restart == (last_restart + 1) % 8);< / div >
< div class = "line" > < a name = "l00670" > < / a > < span class = "lineno" > 670< / span >   last_restart = restart;< / div >
< div class = "line" > < a name = "l00671" > < / a > < span class = "lineno" > 671< / span >   offset += 2;< / div >
< div class = "line" > < a name = "l00672" > < / a > < span class = "lineno" > 672< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00673" > < / a > < span class = "lineno" > 673< / span >   < span class = "comment" > // All remaining marker codes are followed by a length of the header.< / span > < / div >
< div class = "line" > < a name = "l00674" > < / a > < span class = "lineno" > 674< / span >   < span class = "keywordtype" > int< / span > length = Read16(buffer + offset + 2) + 2;< / div >
< div class = "line" > < a name = "l00675" > < / a > < span class = "lineno" > 675< / span >   < / div >
< div class = "line" > < a name = "l00676" > < / a > < span class = "lineno" > 676< / span >   < span class = "comment" > // Special handling of SOS (start of scan) marker since the entropy< / span > < / div >
< div class = "line" > < a name = "l00677" > < / a > < span class = "lineno" > 677< / span >   < span class = "comment" > // coded data follows the SOS. Any xFF byte in the data block must be< / span > < / div >
< div class = "line" > < a name = "l00678" > < / a > < span class = "lineno" > 678< / span >   < span class = "comment" > // followed by x00 in the data.< / span > < / div >
< div class = "line" > < a name = "l00679" > < / a > < span class = "lineno" > 679< / span >   < span class = "keywordflow" > if< / span > (code == 0xda) {< / div >
< div class = "line" > < a name = "l00680" > < / a > < span class = "lineno" > 680< / span >   < span class = "keywordtype" > int< / span > number_components = buffer[offset + 4];< / div >
< div class = "line" > < a name = "l00681" > < / a > < span class = "lineno" > 681< / span >   RCHECK(length == 8 + 2 * number_components);< / div >
< div class = "line" > < a name = "l00682" > < / a > < span class = "lineno" > 682< / span >   < / div >
< div class = "line" > < a name = "l00683" > < / a > < span class = "lineno" > 683< / span >   < span class = "comment" > // Advance to the next marker.< / span > < / div >
< div class = "line" > < a name = "l00684" > < / a > < span class = "lineno" > 684< / span >   offset += length;< / div >
< div class = "line" > < a name = "l00685" > < / a > < span class = "lineno" > 685< / span >   < span class = "keywordflow" > while< / span > (offset + 2 < buffer_size) {< / div >
< div class = "line" > < a name = "l00686" > < / a > < span class = "lineno" > 686< / span >   < span class = "keywordflow" > if< / span > (buffer[offset] == 0xff & & buffer[offset + 1] != 0)< / div >
< div class = "line" > < a name = "l00687" > < / a > < span class = "lineno" > 687< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00688" > < / a > < span class = "lineno" > 688< / span >   ++offset;< / div >
< div class = "line" > < a name = "l00689" > < / a > < span class = "lineno" > 689< / span >   }< / div >
< div class = "line" > < a name = "l00690" > < / a > < span class = "lineno" > 690< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00691" > < / a > < span class = "lineno" > 691< / span >   < span class = "comment" > // Skip over the marker data for the other marker codes.< / span > < / div >
< div class = "line" > < a name = "l00692" > < / a > < span class = "lineno" > 692< / span >   offset += length;< / div >
< div class = "line" > < a name = "l00693" > < / a > < span class = "lineno" > 693< / span >   }< / div >
< div class = "line" > < a name = "l00694" > < / a > < span class = "lineno" > 694< / span >   }< / div >
< div class = "line" > < a name = "l00695" > < / a > < span class = "lineno" > 695< / span >   ++num_codes;< / div >
< div class = "line" > < a name = "l00696" > < / a > < span class = "lineno" > 696< / span >   }< / div >
< div class = "line" > < a name = "l00697" > < / a > < span class = "lineno" > 697< / span >   < span class = "keywordflow" > return< / span > (num_codes > 1);< / div >
< div class = "line" > < a name = "l00698" > < / a > < span class = "lineno" > 698< / span >   }< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00699" > < / a > < span class = "lineno" > 699< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00700" > < / a > < span class = "lineno" > 700< / span >   < span class = "keyword" > enum< / span > Mpeg2StartCodes {< / div >
< div class = "line" > < a name = "l00701" > < / a > < span class = "lineno" > 701< / span >   PROGRAM_END_CODE = 0xb9,< / div >
< div class = "line" > < a name = "l00702" > < / a > < span class = "lineno" > 702< / span >   PACK_START_CODE = 0xba< / div >
< div class = "line" > < a name = "l00703" > < / a > < span class = "lineno" > 703< / span >   };< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00704" > < / a > < span class = "lineno" > 704< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00705" > < / a > < span class = "lineno" > 705< / span >   < span class = "comment" > // Checks for a MPEG2 Program Stream.< / span > < / div >
< div class = "line" > < a name = "l00706" > < / a > < span class = "lineno" > 706< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckMpeg2ProgramStream(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00707" > < / a > < span class = "lineno" > 707< / span >   < span class = "comment" > // Reference: ISO/IEC 13818-1 : 2000 (E) / ITU-T Rec. H.222.0 (2000 E).< / span > < / div >
< div class = "line" > < a name = "l00708" > < / a > < span class = "lineno" > 708< / span >   RCHECK(buffer_size > 14);< / div >
< div class = "line" > < a name = "l00709" > < / a > < span class = "lineno" > 709< / span >   < / div >
< div class = "line" > < a name = "l00710" > < / a > < span class = "lineno" > 710< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00711" > < / a > < span class = "lineno" > 711< / span >   < span class = "keywordflow" > while< / span > (offset + 14 < buffer_size) {< / div >
< div class = "line" > < a name = "l00712" > < / a > < span class = "lineno" > 712< / span >   BitReader reader(buffer + offset, 14);< / div >
< div class = "line" > < a name = "l00713" > < / a > < span class = "lineno" > 713< / span >   < / div >
< div class = "line" > < a name = "l00714" > < / a > < span class = "lineno" > 714< / span >   < span class = "comment" > // Must start with pack_start_code.< / span > < / div >
< div class = "line" > < a name = "l00715" > < / a > < span class = "lineno" > 715< / span >   RCHECK(ReadBits(& reader, 24) == 1);< / div >
< div class = "line" > < a name = "l00716" > < / a > < span class = "lineno" > 716< / span >   RCHECK(ReadBits(& reader, 8) == PACK_START_CODE);< / div >
< div class = "line" > < a name = "l00717" > < / a > < span class = "lineno" > 717< / span >   < / div >
< div class = "line" > < a name = "l00718" > < / a > < span class = "lineno" > 718< / span >   < span class = "comment" > // Determine MPEG version (MPEG1 has b0010, while MPEG2 has b01).< / span > < / div >
< div class = "line" > < a name = "l00719" > < / a > < span class = "lineno" > 719< / span >   < span class = "keywordtype" > int< / span > mpeg_version = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l00720" > < / a > < span class = "lineno" > 720< / span >   < span class = "keywordflow" > if< / span > (mpeg_version == 0) {< / div >
< div class = "line" > < a name = "l00721" > < / a > < span class = "lineno" > 721< / span >   < span class = "comment" > // MPEG1, 10 byte header< / span > < / div >
< div class = "line" > < a name = "l00722" > < / a > < span class = "lineno" > 722< / span >   < span class = "comment" > // Validate rest of version code< / span > < / div >
< div class = "line" > < a name = "l00723" > < / a > < span class = "lineno" > 723< / span >   RCHECK(ReadBits(& reader, 2) == 2);< / div >
< div class = "line" > < a name = "l00724" > < / a > < span class = "lineno" > 724< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00725" > < / a > < span class = "lineno" > 725< / span >   RCHECK(mpeg_version == 1);< / div >
< div class = "line" > < a name = "l00726" > < / a > < span class = "lineno" > 726< / span >   }< / div >
< div class = "line" > < a name = "l00727" > < / a > < span class = "lineno" > 727< / span >   < / div >
< div class = "line" > < a name = "l00728" > < / a > < span class = "lineno" > 728< / span >   < span class = "comment" > // Skip system_clock_reference_base [32..30].< / span > < / div >
< div class = "line" > < a name = "l00729" > < / a > < span class = "lineno" > 729< / span >   reader.SkipBits(3);< / div >
< div class = "line" > < a name = "l00730" > < / a > < span class = "lineno" > 730< / span >   < / div >
< div class = "line" > < a name = "l00731" > < / a > < span class = "lineno" > 731< / span >   < span class = "comment" > // Verify marker bit.< / span > < / div >
< div class = "line" > < a name = "l00732" > < / a > < span class = "lineno" > 732< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l00733" > < / a > < span class = "lineno" > 733< / span >   < / div >
< div class = "line" > < a name = "l00734" > < / a > < span class = "lineno" > 734< / span >   < span class = "comment" > // Skip system_clock_reference_base [29..15].< / span > < / div >
< div class = "line" > < a name = "l00735" > < / a > < span class = "lineno" > 735< / span >   reader.SkipBits(15);< / div >
< div class = "line" > < a name = "l00736" > < / a > < span class = "lineno" > 736< / span >   < / div >
< div class = "line" > < a name = "l00737" > < / a > < span class = "lineno" > 737< / span >   < span class = "comment" > // Verify next marker bit.< / span > < / div >
< div class = "line" > < a name = "l00738" > < / a > < span class = "lineno" > 738< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l00739" > < / a > < span class = "lineno" > 739< / span >   < / div >
< div class = "line" > < a name = "l00740" > < / a > < span class = "lineno" > 740< / span >   < span class = "comment" > // Skip system_clock_reference_base [14..0].< / span > < / div >
< div class = "line" > < a name = "l00741" > < / a > < span class = "lineno" > 741< / span >   reader.SkipBits(15);< / div >
< div class = "line" > < a name = "l00742" > < / a > < span class = "lineno" > 742< / span >   < / div >
< div class = "line" > < a name = "l00743" > < / a > < span class = "lineno" > 743< / span >   < span class = "comment" > // Verify next marker bit.< / span > < / div >
< div class = "line" > < a name = "l00744" > < / a > < span class = "lineno" > 744< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l00745" > < / a > < span class = "lineno" > 745< / span >   < / div >
< div class = "line" > < a name = "l00746" > < / a > < span class = "lineno" > 746< / span >   < span class = "keywordflow" > if< / span > (mpeg_version == 0) {< / div >
< div class = "line" > < a name = "l00747" > < / a > < span class = "lineno" > 747< / span >   < span class = "comment" > // Verify second marker bit.< / span > < / div >
< div class = "line" > < a name = "l00748" > < / a > < span class = "lineno" > 748< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l00749" > < / a > < span class = "lineno" > 749< / span >   < / div >
< div class = "line" > < a name = "l00750" > < / a > < span class = "lineno" > 750< / span >   < span class = "comment" > // Skip mux_rate.< / span > < / div >
< div class = "line" > < a name = "l00751" > < / a > < span class = "lineno" > 751< / span >   reader.SkipBits(22);< / div >
< div class = "line" > < a name = "l00752" > < / a > < span class = "lineno" > 752< / span >   < / div >
< div class = "line" > < a name = "l00753" > < / a > < span class = "lineno" > 753< / span >   < span class = "comment" > // Verify next marker bit.< / span > < / div >
< div class = "line" > < a name = "l00754" > < / a > < span class = "lineno" > 754< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l00755" > < / a > < span class = "lineno" > 755< / span >   < / div >
< div class = "line" > < a name = "l00756" > < / a > < span class = "lineno" > 756< / span >   < span class = "comment" > // Update offset to be after this header.< / span > < / div >
< div class = "line" > < a name = "l00757" > < / a > < span class = "lineno" > 757< / span >   offset += 12;< / div >
< div class = "line" > < a name = "l00758" > < / a > < span class = "lineno" > 758< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00759" > < / a > < span class = "lineno" > 759< / span >   < span class = "comment" > // Must be MPEG2.< / span > < / div >
< div class = "line" > < a name = "l00760" > < / a > < span class = "lineno" > 760< / span >   < span class = "comment" > // Skip program_mux_rate.< / span > < / div >
< div class = "line" > < a name = "l00761" > < / a > < span class = "lineno" > 761< / span >   reader.SkipBits(22);< / div >
< div class = "line" > < a name = "l00762" > < / a > < span class = "lineno" > 762< / span >   < / div >
< div class = "line" > < a name = "l00763" > < / a > < span class = "lineno" > 763< / span >   < span class = "comment" > // Verify pair of marker bits.< / span > < / div >
< div class = "line" > < a name = "l00764" > < / a > < span class = "lineno" > 764< / span >   RCHECK(ReadBits(& reader, 2) == 3);< / div >
< div class = "line" > < a name = "l00765" > < / a > < span class = "lineno" > 765< / span >   < / div >
< div class = "line" > < a name = "l00766" > < / a > < span class = "lineno" > 766< / span >   < span class = "comment" > // Skip reserved.< / span > < / div >
< div class = "line" > < a name = "l00767" > < / a > < span class = "lineno" > 767< / span >   reader.SkipBits(5);< / div >
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< div class = "line" > < a name = "l00768" > < / a > < span class = "lineno" > 768< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00769" > < / a > < span class = "lineno" > 769< / span >   < span class = "comment" > // Update offset to be after this header.< / span > < / div >
< div class = "line" > < a name = "l00770" > < / a > < span class = "lineno" > 770< / span >   < span class = "keywordtype" > int< / span > pack_stuffing_length = ReadBits(& reader, 3);< / div >
< div class = "line" > < a name = "l00771" > < / a > < span class = "lineno" > 771< / span >   offset += 14 + pack_stuffing_length;< / div >
< div class = "line" > < a name = "l00772" > < / a > < span class = "lineno" > 772< / span >   }< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00773" > < / a > < span class = "lineno" > 773< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00774" > < / a > < span class = "lineno" > 774< / span >   < span class = "comment" > // Check for system headers and PES_packets.< / span > < / div >
< div class = "line" > < a name = "l00775" > < / a > < span class = "lineno" > 775< / span >   < span class = "keywordflow" > while< / span > (offset + 6 < buffer_size & & Read24(buffer + offset) == 1) {< / div >
< div class = "line" > < a name = "l00776" > < / a > < span class = "lineno" > 776< / span >   < span class = "comment" > // Next 8 bits determine stream type.< / span > < / div >
< div class = "line" > < a name = "l00777" > < / a > < span class = "lineno" > 777< / span >   < span class = "keywordtype" > int< / span > stream_id = buffer[offset + 3];< / div >
< div class = "line" > < a name = "l00778" > < / a > < span class = "lineno" > 778< / span >   < / div >
< div class = "line" > < a name = "l00779" > < / a > < span class = "lineno" > 779< / span >   < span class = "comment" > // Some stream types are reserved and shouldn' t occur.< / span > < / div >
< div class = "line" > < a name = "l00780" > < / a > < span class = "lineno" > 780< / span >   < span class = "keywordflow" > if< / span > (mpeg_version == 0)< / div >
< div class = "line" > < a name = "l00781" > < / a > < span class = "lineno" > 781< / span >   RCHECK(stream_id != 0xbc & & stream_id < 0xf0);< / div >
< div class = "line" > < a name = "l00782" > < / a > < span class = "lineno" > 782< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00783" > < / a > < span class = "lineno" > 783< / span >   RCHECK(stream_id != 0xfc & & stream_id != 0xfd & & stream_id != 0xfe);< / div >
< div class = "line" > < a name = "l00784" > < / a > < span class = "lineno" > 784< / span >   < / div >
< div class = "line" > < a name = "l00785" > < / a > < span class = "lineno" > 785< / span >   < span class = "comment" > // Some stream types are used for pack headers.< / span > < / div >
< div class = "line" > < a name = "l00786" > < / a > < span class = "lineno" > 786< / span >   < span class = "keywordflow" > if< / span > (stream_id == PACK_START_CODE) < span class = "comment" > // back to outer loop.< / span > < / div >
< div class = "line" > < a name = "l00787" > < / a > < span class = "lineno" > 787< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00788" > < / a > < span class = "lineno" > 788< / span >   < span class = "keywordflow" > if< / span > (stream_id == PROGRAM_END_CODE) < span class = "comment" > // end of stream.< / span > < / div >
< div class = "line" > < a name = "l00789" > < / a > < span class = "lineno" > 789< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00790" > < / a > < span class = "lineno" > 790< / span >   < / div >
< div class = "line" > < a name = "l00791" > < / a > < span class = "lineno" > 791< / span >   < span class = "keywordtype" > int< / span > pes_length = Read16(buffer + offset + 4);< / div >
< div class = "line" > < a name = "l00792" > < / a > < span class = "lineno" > 792< / span >   RCHECK(pes_length > 0);< / div >
< div class = "line" > < a name = "l00793" > < / a > < span class = "lineno" > 793< / span >   offset = offset + 6 + pes_length;< / div >
< div class = "line" > < a name = "l00794" > < / a > < span class = "lineno" > 794< / span >   }< / div >
< div class = "line" > < a name = "l00795" > < / a > < span class = "lineno" > 795< / span >   }< / div >
< div class = "line" > < a name = "l00796" > < / a > < span class = "lineno" > 796< / span >   < span class = "comment" > // Success as we are off the end of the buffer and liked everything< / span > < / div >
< div class = "line" > < a name = "l00797" > < / a > < span class = "lineno" > 797< / span >   < span class = "comment" > // in the buffer.< / span > < / div >
< div class = "line" > < a name = "l00798" > < / a > < span class = "lineno" > 798< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00799" > < / a > < span class = "lineno" > 799< / span >   }< / div >
< div class = "line" > < a name = "l00800" > < / a > < span class = "lineno" > 800< / span >   < / div >
< div class = "line" > < a name = "l00801" > < / a > < span class = "lineno" > 801< / span >   < span class = "keyword" > const< / span > uint8_t kMpeg2SyncWord = 0x47;< / div >
< div class = "line" > < a name = "l00802" > < / a > < span class = "lineno" > 802< / span >   < / div >
< div class = "line" > < a name = "l00803" > < / a > < span class = "lineno" > 803< / span >   < span class = "comment" > // Checks for a MPEG2 Transport Stream.< / span > < / div >
< div class = "line" > < a name = "l00804" > < / a > < span class = "lineno" > 804< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckMpeg2TransportStream(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00805" > < / a > < span class = "lineno" > 805< / span >   < span class = "comment" > // Spec: ISO/IEC 13818-1 : 2000 (E) / ITU-T Rec. H.222.0 (2000 E).< / span > < / div >
< div class = "line" > < a name = "l00806" > < / a > < span class = "lineno" > 806< / span >   < span class = "comment" > // Normal packet size is 188 bytes. However, some systems add various error< / span > < / div >
< div class = "line" > < a name = "l00807" > < / a > < span class = "lineno" > 807< / span >   < span class = "comment" > // correction data at the end, resulting in packet of length 192/204/208< / span > < / div >
< div class = "line" > < a name = "l00808" > < / a > < span class = "lineno" > 808< / span >   < span class = "comment" > // (https://en.wikipedia.org/wiki/MPEG_transport_stream). Determine the< / span > < / div >
< div class = "line" > < a name = "l00809" > < / a > < span class = "lineno" > 809< / span >   < span class = "comment" > // length with the first packet.< / span > < / div >
< div class = "line" > < a name = "l00810" > < / a > < span class = "lineno" > 810< / span >   RCHECK(buffer_size > = 250); < span class = "comment" > // Want more than 1 packet to check.< / span > < / div >
< div class = "line" > < a name = "l00811" > < / a > < span class = "lineno" > 811< / span >   < / div >
< div class = "line" > < a name = "l00812" > < / a > < span class = "lineno" > 812< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00813" > < / a > < span class = "lineno" > 813< / span >   < span class = "keywordtype" > int< / span > packet_length = -1;< / div >
< div class = "line" > < a name = "l00814" > < / a > < span class = "lineno" > 814< / span >   < span class = "keywordflow" > while< / span > (buffer[offset] != kMpeg2SyncWord & & offset < 20) {< / div >
< div class = "line" > < a name = "l00815" > < / a > < span class = "lineno" > 815< / span >   < span class = "comment" > // Skip over any header in the first 20 bytes.< / span > < / div >
< div class = "line" > < a name = "l00816" > < / a > < span class = "lineno" > 816< / span >   ++offset;< / div >
< div class = "line" > < a name = "l00817" > < / a > < span class = "lineno" > 817< / span >   }< / div >
< div class = "line" > < a name = "l00818" > < / a > < span class = "lineno" > 818< / span >   < / div >
< div class = "line" > < a name = "l00819" > < / a > < span class = "lineno" > 819< / span >   < span class = "keywordflow" > while< / span > (offset + 6 < buffer_size) {< / div >
< div class = "line" > < a name = "l00820" > < / a > < span class = "lineno" > 820< / span >   BitReader reader(buffer + offset, 6);< / div >
< div class = "line" > < a name = "l00821" > < / a > < span class = "lineno" > 821< / span >   < / div >
< div class = "line" > < a name = "l00822" > < / a > < span class = "lineno" > 822< / span >   < span class = "comment" > // Must start with sync byte.< / span > < / div >
< div class = "line" > < a name = "l00823" > < / a > < span class = "lineno" > 823< / span >   RCHECK(ReadBits(& reader, 8) == kMpeg2SyncWord);< / div >
< div class = "line" > < a name = "l00824" > < / a > < span class = "lineno" > 824< / span >   < / div >
< div class = "line" > < a name = "l00825" > < / a > < span class = "lineno" > 825< / span >   < span class = "comment" > // Skip transport_error_indicator, payload_unit_start_indicator, and< / span > < / div >
< div class = "line" > < a name = "l00826" > < / a > < span class = "lineno" > 826< / span >   < span class = "comment" > // transport_priority.< / span > < / div >
< div class = "line" > < a name = "l00827" > < / a > < span class = "lineno" > 827< / span >   reader.SkipBits(1 + 1 + 1);< / div >
< div class = "line" > < a name = "l00828" > < / a > < span class = "lineno" > 828< / span >   < / div >
< div class = "line" > < a name = "l00829" > < / a > < span class = "lineno" > 829< / span >   < span class = "comment" > // Verify the pid is not a reserved value.< / span > < / div >
< div class = "line" > < a name = "l00830" > < / a > < span class = "lineno" > 830< / span >   < span class = "keywordtype" > int< / span > pid = ReadBits(& reader, 13);< / div >
< div class = "line" > < a name = "l00831" > < / a > < span class = "lineno" > 831< / span >   RCHECK(pid < 3 || pid > 15);< / div >
< div class = "line" > < a name = "l00832" > < / a > < span class = "lineno" > 832< / span >   < / div >
< div class = "line" > < a name = "l00833" > < / a > < span class = "lineno" > 833< / span >   < span class = "comment" > // Skip transport_scrambling_control.< / span > < / div >
< div class = "line" > < a name = "l00834" > < / a > < span class = "lineno" > 834< / span >   reader.SkipBits(2);< / div >
< div class = "line" > < a name = "l00835" > < / a > < span class = "lineno" > 835< / span >   < / div >
< div class = "line" > < a name = "l00836" > < / a > < span class = "lineno" > 836< / span >   < span class = "comment" > // Adaptation_field_control can not be 0.< / span > < / div >
< div class = "line" > < a name = "l00837" > < / a > < span class = "lineno" > 837< / span >   < span class = "keywordtype" > int< / span > adaptation_field_control = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l00838" > < / a > < span class = "lineno" > 838< / span >   RCHECK(adaptation_field_control != 0);< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00839" > < / a > < span class = "lineno" > 839< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00840" > < / a > < span class = "lineno" > 840< / span >   < span class = "comment" > // If there is an adaptation_field, verify it.< / span > < / div >
< div class = "line" > < a name = "l00841" > < / a > < span class = "lineno" > 841< / span >   < span class = "keywordflow" > if< / span > (adaptation_field_control > = 2) {< / div >
< div class = "line" > < a name = "l00842" > < / a > < span class = "lineno" > 842< / span >   < span class = "comment" > // Skip continuity_counter.< / span > < / div >
< div class = "line" > < a name = "l00843" > < / a > < span class = "lineno" > 843< / span >   reader.SkipBits(4);< / div >
< div class = "line" > < a name = "l00844" > < / a > < span class = "lineno" > 844< / span >   < / div >
< div class = "line" > < a name = "l00845" > < / a > < span class = "lineno" > 845< / span >   < span class = "comment" > // Get adaptation_field_length and verify it.< / span > < / div >
< div class = "line" > < a name = "l00846" > < / a > < span class = "lineno" > 846< / span >   < span class = "keywordtype" > int< / span > adaptation_field_length = ReadBits(& reader, 8);< / div >
< div class = "line" > < a name = "l00847" > < / a > < span class = "lineno" > 847< / span >   < span class = "keywordflow" > if< / span > (adaptation_field_control == 2)< / div >
< div class = "line" > < a name = "l00848" > < / a > < span class = "lineno" > 848< / span >   RCHECK(adaptation_field_length == 183);< / div >
< div class = "line" > < a name = "l00849" > < / a > < span class = "lineno" > 849< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00850" > < / a > < span class = "lineno" > 850< / span >   RCHECK(adaptation_field_length < = 182);< / div >
< div class = "line" > < a name = "l00851" > < / a > < span class = "lineno" > 851< / span >   }< / div >
< div class = "line" > < a name = "l00852" > < / a > < span class = "lineno" > 852< / span >   < / div >
< div class = "line" > < a name = "l00853" > < / a > < span class = "lineno" > 853< / span >   < span class = "comment" > // Attempt to determine the packet length on the first packet.< / span > < / div >
< div class = "line" > < a name = "l00854" > < / a > < span class = "lineno" > 854< / span >   < span class = "keywordflow" > if< / span > (packet_length < 0) {< / div >
< div class = "line" > < a name = "l00855" > < / a > < span class = "lineno" > 855< / span >   < span class = "keywordflow" > if< / span > (buffer[offset + 188] == kMpeg2SyncWord)< / div >
< div class = "line" > < a name = "l00856" > < / a > < span class = "lineno" > 856< / span >   packet_length = 188;< / div >
< div class = "line" > < a name = "l00857" > < / a > < span class = "lineno" > 857< / span >   < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (buffer[offset + 192] == kMpeg2SyncWord)< / div >
< div class = "line" > < a name = "l00858" > < / a > < span class = "lineno" > 858< / span >   packet_length = 192;< / div >
< div class = "line" > < a name = "l00859" > < / a > < span class = "lineno" > 859< / span >   < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (buffer[offset + 204] == kMpeg2SyncWord)< / div >
< div class = "line" > < a name = "l00860" > < / a > < span class = "lineno" > 860< / span >   packet_length = 204;< / div >
< div class = "line" > < a name = "l00861" > < / a > < span class = "lineno" > 861< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00862" > < / a > < span class = "lineno" > 862< / span >   packet_length = 208;< / div >
< div class = "line" > < a name = "l00863" > < / a > < span class = "lineno" > 863< / span >   }< / div >
< div class = "line" > < a name = "l00864" > < / a > < span class = "lineno" > 864< / span >   offset += packet_length;< / div >
< div class = "line" > < a name = "l00865" > < / a > < span class = "lineno" > 865< / span >   }< / div >
< div class = "line" > < a name = "l00866" > < / a > < span class = "lineno" > 866< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00867" > < / a > < span class = "lineno" > 867< / span >   }< / div >
< div class = "line" > < a name = "l00868" > < / a > < span class = "lineno" > 868< / span >   < / div >
< div class = "line" > < a name = "l00869" > < / a > < span class = "lineno" > 869< / span >   < span class = "keyword" > enum< / span > Mpeg4StartCodes {< / div >
< div class = "line" > < a name = "l00870" > < / a > < span class = "lineno" > 870< / span >   VISUAL_OBJECT_SEQUENCE_START_CODE = 0xb0,< / div >
< div class = "line" > < a name = "l00871" > < / a > < span class = "lineno" > 871< / span >   VISUAL_OBJECT_SEQUENCE_END_CODE = 0xb1,< / div >
< div class = "line" > < a name = "l00872" > < / a > < span class = "lineno" > 872< / span >   VISUAL_OBJECT_START_CODE = 0xb5,< / div >
< div class = "line" > < a name = "l00873" > < / a > < span class = "lineno" > 873< / span >   VOP_START_CODE = 0xb6< / div >
< div class = "line" > < a name = "l00874" > < / a > < span class = "lineno" > 874< / span >   };< / div >
< div class = "line" > < a name = "l00875" > < / a > < span class = "lineno" > 875< / span >   < / div >
< div class = "line" > < a name = "l00876" > < / a > < span class = "lineno" > 876< / span >   < span class = "comment" > // Checks for a raw MPEG4 bitstream container.< / span > < / div >
< div class = "line" > < a name = "l00877" > < / a > < span class = "lineno" > 877< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckMpeg4BitStream(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00878" > < / a > < span class = "lineno" > 878< / span >   < span class = "comment" > // Defined in ISO/IEC 14496-2:2001.< / span > < / div >
< div class = "line" > < a name = "l00879" > < / a > < span class = "lineno" > 879< / span >   < span class = "comment" > // However, no length ... simply scan for start code values.< / span > < / div >
< div class = "line" > < a name = "l00880" > < / a > < span class = "lineno" > 880< / span >   < span class = "comment" > // Note tags are very similar to H.264.< / span > < / div >
< div class = "line" > < a name = "l00881" > < / a > < span class = "lineno" > 881< / span >   RCHECK(buffer_size > 4);< / div >
< div class = "line" > < a name = "l00882" > < / a > < span class = "lineno" > 882< / span >   < / div >
< div class = "line" > < a name = "l00883" > < / a > < span class = "lineno" > 883< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l00884" > < / a > < span class = "lineno" > 884< / span >   < span class = "keywordtype" > int< / span > sequence_start_count = 0;< / div >
< div class = "line" > < a name = "l00885" > < / a > < span class = "lineno" > 885< / span >   < span class = "keywordtype" > int< / span > sequence_end_count = 0;< / div >
< div class = "line" > < a name = "l00886" > < / a > < span class = "lineno" > 886< / span >   < span class = "keywordtype" > int< / span > visual_object_count = 0;< / div >
< div class = "line" > < a name = "l00887" > < / a > < span class = "lineno" > 887< / span >   < span class = "keywordtype" > int< / span > vop_count = 0;< / div >
< div class = "line" > < a name = "l00888" > < / a > < span class = "lineno" > 888< / span >   < span class = "keywordflow" > while< / span > (< span class = "keyword" > true< / span > ) {< / div >
< div class = "line" > < a name = "l00889" > < / a > < span class = "lineno" > 889< / span >   < span class = "comment" > // Advance to start_code, if there is one.< / span > < / div >
< div class = "line" > < a name = "l00890" > < / a > < span class = "lineno" > 890< / span >   < span class = "keywordflow" > if< / span > (!AdvanceToStartCode(buffer, buffer_size, & offset, 6, 24, 1)) {< / div >
< div class = "line" > < a name = "l00891" > < / a > < span class = "lineno" > 891< / span >   < span class = "comment" > // Not a complete sequence in memory, so return true if we' ve seen a< / span > < / div >
< div class = "line" > < a name = "l00892" > < / a > < span class = "lineno" > 892< / span >   < span class = "comment" > // visual_object_sequence_start_code and a visual_object_start_code.< / span > < / div >
< div class = "line" > < a name = "l00893" > < / a > < span class = "lineno" > 893< / span >   < span class = "keywordflow" > return< / span > (sequence_start_count > 0 & & visual_object_count > 0);< / div >
< div class = "line" > < a name = "l00894" > < / a > < span class = "lineno" > 894< / span >   }< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00895" > < / a > < span class = "lineno" > 895< / span >   < / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00896" > < / a > < span class = "lineno" > 896< / span >   < span class = "comment" > // Now verify the block. AdvanceToStartCode() made sure that there are< / span > < / div >
< div class = "line" > < a name = "l00897" > < / a > < span class = "lineno" > 897< / span >   < span class = "comment" > // at least 6 bytes remaining in the buffer.< / span > < / div >
< div class = "line" > < a name = "l00898" > < / a > < span class = "lineno" > 898< / span >   BitReader reader(buffer + offset, 6);< / div >
< div class = "line" > < a name = "l00899" > < / a > < span class = "lineno" > 899< / span >   RCHECK(ReadBits(& reader, 24) == 1);< / div >
< div class = "line" > < a name = "l00900" > < / a > < span class = "lineno" > 900< / span >   < / div >
< div class = "line" > < a name = "l00901" > < / a > < span class = "lineno" > 901< / span >   < span class = "keywordtype" > int< / span > start_code = ReadBits(& reader, 8);< / div >
< div class = "line" > < a name = "l00902" > < / a > < span class = "lineno" > 902< / span >   RCHECK(start_code < 0x30 || start_code > 0xaf); < span class = "comment" > // 30..AF and< / span > < / div >
< div class = "line" > < a name = "l00903" > < / a > < span class = "lineno" > 903< / span >   RCHECK(start_code < 0xb7 || start_code > 0xb9); < span class = "comment" > // B7..B9 reserved< / span > < / div >
< div class = "line" > < a name = "l00904" > < / a > < span class = "lineno" > 904< / span >   < / div >
< div class = "line" > < a name = "l00905" > < / a > < span class = "lineno" > 905< / span >   < span class = "keywordflow" > switch< / span > (start_code) {< / div >
< div class = "line" > < a name = "l00906" > < / a > < span class = "lineno" > 906< / span >   < span class = "keywordflow" > case< / span > VISUAL_OBJECT_SEQUENCE_START_CODE: {< / div >
< div class = "line" > < a name = "l00907" > < / a > < span class = "lineno" > 907< / span >   ++sequence_start_count;< / div >
< div class = "line" > < a name = "l00908" > < / a > < span class = "lineno" > 908< / span >   < span class = "comment" > // Verify profile in not one of many reserved values.< / span > < / div >
< div class = "line" > < a name = "l00909" > < / a > < span class = "lineno" > 909< / span >   < span class = "keywordtype" > int< / span > profile = ReadBits(& reader, 8);< / div >
< div class = "line" > < a name = "l00910" > < / a > < span class = "lineno" > 910< / span >   RCHECK(profile > 0);< / div >
< div class = "line" > < a name = "l00911" > < / a > < span class = "lineno" > 911< / span >   RCHECK(profile < 0x04 || profile > 0x10);< / div >
< div class = "line" > < a name = "l00912" > < / a > < span class = "lineno" > 912< / span >   RCHECK(profile < 0x13 || profile > 0x20);< / div >
< div class = "line" > < a name = "l00913" > < / a > < span class = "lineno" > 913< / span >   RCHECK(profile < 0x23 || profile > 0x31);< / div >
< div class = "line" > < a name = "l00914" > < / a > < span class = "lineno" > 914< / span >   RCHECK(profile < 0x35 || profile > 0x41);< / div >
< div class = "line" > < a name = "l00915" > < / a > < span class = "lineno" > 915< / span >   RCHECK(profile < 0x43 || profile > 0x60);< / div >
< div class = "line" > < a name = "l00916" > < / a > < span class = "lineno" > 916< / span >   RCHECK(profile < 0x65 || profile > 0x70);< / div >
< div class = "line" > < a name = "l00917" > < / a > < span class = "lineno" > 917< / span >   RCHECK(profile < 0x73 || profile > 0x80);< / div >
< div class = "line" > < a name = "l00918" > < / a > < span class = "lineno" > 918< / span >   RCHECK(profile < 0x83 || profile > 0x90);< / div >
< div class = "line" > < a name = "l00919" > < / a > < span class = "lineno" > 919< / span >   RCHECK(profile < 0x95 || profile > 0xa0);< / div >
< div class = "line" > < a name = "l00920" > < / a > < span class = "lineno" > 920< / span >   RCHECK(profile < 0xa4 || profile > 0xb0);< / div >
< div class = "line" > < a name = "l00921" > < / a > < span class = "lineno" > 921< / span >   RCHECK(profile < 0xb5 || profile > 0xc0);< / div >
< div class = "line" > < a name = "l00922" > < / a > < span class = "lineno" > 922< / span >   RCHECK(profile < 0xc3 || profile > 0xd0);< / div >
< div class = "line" > < a name = "l00923" > < / a > < span class = "lineno" > 923< / span >   RCHECK(profile < 0xe4);< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00924" > < / a > < span class = "lineno" > 924< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00925" > < / a > < span class = "lineno" > 925< / span >   }< / div >
< div class = "line" > < a name = "l00926" > < / a > < span class = "lineno" > 926< / span >   < / div >
< div class = "line" > < a name = "l00927" > < / a > < span class = "lineno" > 927< / span >   < span class = "keywordflow" > case< / span > VISUAL_OBJECT_SEQUENCE_END_CODE:< / div >
< div class = "line" > < a name = "l00928" > < / a > < span class = "lineno" > 928< / span >   RCHECK(++sequence_end_count == sequence_start_count);< / div >
< div class = "line" > < a name = "l00929" > < / a > < span class = "lineno" > 929< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00930" > < / a > < span class = "lineno" > 930< / span >   < / div >
< div class = "line" > < a name = "l00931" > < / a > < span class = "lineno" > 931< / span >   < span class = "keywordflow" > case< / span > VISUAL_OBJECT_START_CODE: {< / div >
< div class = "line" > < a name = "l00932" > < / a > < span class = "lineno" > 932< / span >   ++visual_object_count;< / div >
< div class = "line" > < a name = "l00933" > < / a > < span class = "lineno" > 933< / span >   < span class = "keywordflow" > if< / span > (ReadBits(& reader, 1) == 1) {< / div >
< div class = "line" > < a name = "l00934" > < / a > < span class = "lineno" > 934< / span >   < span class = "keywordtype" > int< / span > visual_object_verid = ReadBits(& reader, 4);< / div >
< div class = "line" > < a name = "l00935" > < / a > < span class = "lineno" > 935< / span >   RCHECK(visual_object_verid > 0 & & visual_object_verid < 3);< / div >
< div class = "line" > < a name = "l00936" > < / a > < span class = "lineno" > 936< / span >   RCHECK(ReadBits(& reader, 3) != 0);< / div >
< div class = "line" > < a name = "l00937" > < / a > < span class = "lineno" > 937< / span >   }< / div >
< div class = "line" > < a name = "l00938" > < / a > < span class = "lineno" > 938< / span >   < span class = "keywordtype" > int< / span > visual_object_type = ReadBits(& reader, 4);< / div >
< div class = "line" > < a name = "l00939" > < / a > < span class = "lineno" > 939< / span >   RCHECK(visual_object_type > 0 & & visual_object_type < 6);< / div >
2015-12-17 18:37:44 +00:00
< div class = "line" > < a name = "l00940" > < / a > < span class = "lineno" > 940< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-04-22 17:33:09 +00:00
< div class = "line" > < a name = "l00941" > < / a > < span class = "lineno" > 941< / span >   }< / div >
< div class = "line" > < a name = "l00942" > < / a > < span class = "lineno" > 942< / span >   < / div >
< div class = "line" > < a name = "l00943" > < / a > < span class = "lineno" > 943< / span >   < span class = "keywordflow" > case< / span > VOP_START_CODE:< / div >
< div class = "line" > < a name = "l00944" > < / a > < span class = "lineno" > 944< / span >   RCHECK(++vop_count < = visual_object_count);< / div >
< div class = "line" > < a name = "l00945" > < / a > < span class = "lineno" > 945< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00946" > < / a > < span class = "lineno" > 946< / span >   }< / div >
< div class = "line" > < a name = "l00947" > < / a > < span class = "lineno" > 947< / span >   < span class = "comment" > // Skip this block.< / span > < / div >
< div class = "line" > < a name = "l00948" > < / a > < span class = "lineno" > 948< / span >   offset += 6;< / div >
< div class = "line" > < a name = "l00949" > < / a > < span class = "lineno" > 949< / span >   }< / div >
< div class = "line" > < a name = "l00950" > < / a > < span class = "lineno" > 950< / span >   }< / div >
< div class = "line" > < a name = "l00951" > < / a > < span class = "lineno" > 951< / span >   < / div >
< div class = "line" > < a name = "l00952" > < / a > < span class = "lineno" > 952< / span >   < span class = "comment" > // Additional checks for a MOV/QuickTime/MPEG4 container.< / span > < / div >
< div class = "line" > < a name = "l00953" > < / a > < span class = "lineno" > 953< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckMov(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l00954" > < / a > < span class = "lineno" > 954< / span >   < span class = "comment" > // Reference: ISO/IEC 14496-12:2005(E).< / span > < / div >
< div class = "line" > < a name = "l00955" > < / a > < span class = "lineno" > 955< / span >   < span class = "comment" > // (http://standards.iso.org/ittf/PubliclyAvailableStandards/c061988_ISO_IEC_14496-12_2012.zip)< / span > < / div >
< div class = "line" > < a name = "l00956" > < / a > < span class = "lineno" > 956< / span >   RCHECK(buffer_size > 8);< / div >
< div class = "line" > < a name = "l00957" > < / a > < span class = "lineno" > 957< / span >   < / div >
< div class = "line" > < a name = "l00958" > < / a > < span class = "lineno" > 958< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l00959" > < / a > < span class = "lineno" > 959< / span >   < span class = "keywordtype" > int< / span > boxes_seen = 0;< / div >
< div class = "line" > < a name = "l00960" > < / a > < span class = "lineno" > 960< / span >   < span class = "keywordflow" > while< / span > (offset + 8 < buffer_size) {< / div >
< div class = "line" > < a name = "l00961" > < / a > < span class = "lineno" > 961< / span >   < span class = "keywordtype" > int< / span > atomsize = Read32(buffer + offset);< / div >
< div class = "line" > < a name = "l00962" > < / a > < span class = "lineno" > 962< / span >   uint32_t atomtype = Read32(buffer + offset + 4);< / div >
< div class = "line" > < a name = "l00963" > < / a > < span class = "lineno" > 963< / span >   < span class = "comment" > // Only need to check for ones that are valid at the top level.< / span > < / div >
< div class = "line" > < a name = "l00964" > < / a > < span class = "lineno" > 964< / span >   < span class = "keywordflow" > switch< / span > (atomtype) {< / div >
< div class = "line" > < a name = "l00965" > < / a > < span class = "lineno" > 965< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' f' < / span > ,< span class = "charliteral" > ' t' < / span > ,< span class = "charliteral" > ' y' < / span > ,< span class = "charliteral" > ' p' < / span > ):< / div >
< div class = "line" > < a name = "l00966" > < / a > < span class = "lineno" > 966< / span >   case TAG(< span class = "stringliteral" > ' p' < / span > ,< span class = "stringliteral" > ' d' < / span > ,< span class = "stringliteral" > ' i' < / span > ,< span class = "stringliteral" > ' n' < / span > ):< / div >
< div class = "line" > < a name = "l00967" > < / a > < span class = "lineno" > 967< / span >   case TAG(< span class = "stringliteral" > ' b' < / span > ,< span class = "stringliteral" > ' l' < / span > ,< span class = "stringliteral" > ' o' < / span > ,< span class = "stringliteral" > ' c' < / span > ):< / div >
< div class = "line" > < a name = "l00968" > < / a > < span class = "lineno" > 968< / span >   case TAG(< span class = "stringliteral" > ' m' < / span > ,< span class = "stringliteral" > ' o' < / span > ,< span class = "stringliteral" > ' o' < / span > ,< span class = "stringliteral" > ' v' < / span > ):< / div >
< div class = "line" > < a name = "l00969" > < / a > < span class = "lineno" > 969< / span >   case TAG(< span class = "stringliteral" > ' m' < / span > ,< span class = "stringliteral" > ' o' < / span > ,< span class = "stringliteral" > ' o' < / span > ,< span class = "stringliteral" > ' f' < / span > ):< / div >
< div class = "line" > < a name = "l00970" > < / a > < span class = "lineno" > 970< / span >   case TAG(< span class = "stringliteral" > ' m' < / span > ,< span class = "stringliteral" > ' f' < / span > ,< span class = "stringliteral" > ' r' < / span > ,< span class = "stringliteral" > ' a' < / span > ):< / div >
< div class = "line" > < a name = "l00971" > < / a > < span class = "lineno" > 971< / span >   case TAG(< span class = "stringliteral" > ' m' < / span > ,< span class = "stringliteral" > ' d' < / span > ,< span class = "stringliteral" > ' a' < / span > ,< span class = "stringliteral" > ' t' < / span > ):< / div >
< div class = "line" > < a name = "l00972" > < / a > < span class = "lineno" > 972< / span >   case TAG(< span class = "stringliteral" > ' f' < / span > ,< span class = "stringliteral" > ' r' < / span > ,< span class = "stringliteral" > ' e' < / span > ,< span class = "stringliteral" > ' e' < / span > ):< / div >
< div class = "line" > < a name = "l00973" > < / a > < span class = "lineno" > 973< / span >   case TAG(< span class = "stringliteral" > ' s' < / span > ,< span class = "stringliteral" > ' k' < / span > ,< span class = "stringliteral" > ' i' < / span > ,< span class = "stringliteral" > ' p' < / span > ):< / div >
< div class = "line" > < a name = "l00974" > < / a > < span class = "lineno" > 974< / span >   case TAG(< span class = "stringliteral" > ' m' < / span > ,< span class = "stringliteral" > ' e' < / span > ,< span class = "stringliteral" > ' t' < / span > ,< span class = "stringliteral" > ' a' < / span > ):< / div >
< div class = "line" > < a name = "l00975" > < / a > < span class = "lineno" > 975< / span >   case TAG(< span class = "stringliteral" > ' m' < / span > ,< span class = "stringliteral" > ' e' < / span > ,< span class = "stringliteral" > ' c' < / span > ,< span class = "stringliteral" > ' o' < / span > ):< / div >
< div class = "line" > < a name = "l00976" > < / a > < span class = "lineno" > 976< / span >   case TAG(< span class = "stringliteral" > ' s' < / span > ,< span class = "stringliteral" > ' t' < / span > ,< span class = "stringliteral" > ' y' < / span > ,< span class = "stringliteral" > ' p' < / span > ):< / div >
< div class = "line" > < a name = "l00977" > < / a > < span class = "lineno" > 977< / span >   case TAG(< span class = "stringliteral" > ' s' < / span > ,< span class = "stringliteral" > ' i' < / span > ,< span class = "stringliteral" > ' d' < / span > ,< span class = "stringliteral" > ' x' < / span > ):< / div >
< div class = "line" > < a name = "l00978" > < / a > < span class = "lineno" > 978< / span >   case TAG(< span class = "stringliteral" > ' s' < / span > ,< span class = "stringliteral" > ' s' < / span > ,< span class = "stringliteral" > ' i' < / span > ,< span class = "stringliteral" > ' x' < / span > ):< / div >
< div class = "line" > < a name = "l00979" > < / a > < span class = "lineno" > 979< / span >   case TAG(< span class = "stringliteral" > ' p' < / span > ,< span class = "stringliteral" > ' r' < / span > ,< span class = "stringliteral" > ' f' < / span > ,< span class = "stringliteral" > ' t' < / span > ):< / div >
< div class = "line" > < a name = "l00980" > < / a > < span class = "lineno" > 980< / span >   case TAG(< span class = "stringliteral" > ' u' < / span > ,< span class = "stringliteral" > ' u' < / span > ,< span class = "stringliteral" > ' i' < / span > ,< span class = "stringliteral" > ' d' < / span > ):< / div >
< div class = "line" > < a name = "l00981" > < / a > < span class = "lineno" > 981< / span >   < span class = "comment" > // Assumes that it is an iso-bmff file after seeing two known boxes.< / span > < / div >
< div class = "line" > < a name = "l00982" > < / a > < span class = "lineno" > 982< / span >   < span class = "comment" > // Note that it is correct only for our use cases as we support only< / span > < / div >
< div class = "line" > < a name = "l00983" > < / a > < span class = "lineno" > 983< / span >   < span class = "comment" > // a limited number of containers, and there is no other container< / span > < / div >
< div class = "line" > < a name = "l00984" > < / a > < span class = "lineno" > 984< / span >   < span class = "comment" > // has this behavior.< / span > < / div >
< div class = "line" > < a name = "l00985" > < / a > < span class = "lineno" > 985< / span >   if (++boxes_seen > = 2)< / div >
< div class = "line" > < a name = "l00986" > < / a > < span class = "lineno" > 986< / span >   return true;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l00987" > < / a > < span class = "lineno" > 987< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l00988" > < / a > < span class = "lineno" > 988< / span >   < span class = "keywordflow" > default< / span > :< / div >
< div class = "line" > < a name = "l00989" > < / a > < span class = "lineno" > 989< / span >   < span class = "comment" > // Ignore unrecognized box.< / span > < / div >
< div class = "line" > < a name = "l00990" > < / a > < span class = "lineno" > 990< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l00991" > < / a > < span class = "lineno" > 991< / span >   }< / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l00992" > < / a > < span class = "lineno" > 992< / span >   < span class = "keywordflow" > if< / span > (atomsize == 1) {< / div >
< div class = "line" > < a name = "l00993" > < / a > < span class = "lineno" > 993< / span >   < span class = "comment" > // Indicates that the length is the next 64bits.< / span > < / div >
< div class = "line" > < a name = "l00994" > < / a > < span class = "lineno" > 994< / span >   < span class = "keywordflow" > if< / span > (offset + 16 > buffer_size)< / div >
< div class = "line" > < a name = "l00995" > < / a > < span class = "lineno" > 995< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00996" > < / a > < span class = "lineno" > 996< / span >   < span class = "keywordflow" > if< / span > (Read32(buffer + offset + 8) != 0)< / div >
< div class = "line" > < a name = "l00997" > < / a > < span class = "lineno" > 997< / span >   < span class = "keywordflow" > break< / span > ; < span class = "comment" > // Offset is way past buffer size.< / span > < / div >
< div class = "line" > < a name = "l00998" > < / a > < span class = "lineno" > 998< / span >   atomsize = Read32(buffer + offset + 12);< / div >
< div class = "line" > < a name = "l00999" > < / a > < span class = "lineno" > 999< / span >   }< / div >
< div class = "line" > < a name = "l01000" > < / a > < span class = "lineno" > 1000< / span >   < span class = "keywordflow" > if< / span > (atomsize < = 0)< / div >
< div class = "line" > < a name = "l01001" > < / a > < span class = "lineno" > 1001< / span >   < span class = "keywordflow" > break< / span > ; < span class = "comment" > // Indicates the last atom or length too big.< / span > < / div >
< div class = "line" > < a name = "l01002" > < / a > < span class = "lineno" > 1002< / span >   offset += atomsize;< / div >
< div class = "line" > < a name = "l01003" > < / a > < span class = "lineno" > 1003< / span >   }< / div >
< div class = "line" > < a name = "l01004" > < / a > < span class = "lineno" > 1004< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l01005" > < / a > < span class = "lineno" > 1005< / span >   }< / div >
< div class = "line" > < a name = "l01006" > < / a > < span class = "lineno" > 1006< / span >   < / div >
< div class = "line" > < a name = "l01007" > < / a > < span class = "lineno" > 1007< / span >   < span class = "keyword" > enum< / span > MPEGVersion {< / div >
< div class = "line" > < a name = "l01008" > < / a > < span class = "lineno" > 1008< / span >   VERSION_25 = 0,< / div >
< div class = "line" > < a name = "l01009" > < / a > < span class = "lineno" > 1009< / span >   VERSION_RESERVED,< / div >
< div class = "line" > < a name = "l01010" > < / a > < span class = "lineno" > 1010< / span >   VERSION_2,< / div >
< div class = "line" > < a name = "l01011" > < / a > < span class = "lineno" > 1011< / span >   VERSION_1< / div >
< div class = "line" > < a name = "l01012" > < / a > < span class = "lineno" > 1012< / span >   };< / div >
< div class = "line" > < a name = "l01013" > < / a > < span class = "lineno" > 1013< / span >   < span class = "keyword" > enum< / span > MPEGLayer {< / div >
< div class = "line" > < a name = "l01014" > < / a > < span class = "lineno" > 1014< / span >   L_RESERVED = 0,< / div >
< div class = "line" > < a name = "l01015" > < / a > < span class = "lineno" > 1015< / span >   LAYER_3,< / div >
< div class = "line" > < a name = "l01016" > < / a > < span class = "lineno" > 1016< / span >   LAYER_2,< / div >
< div class = "line" > < a name = "l01017" > < / a > < span class = "lineno" > 1017< / span >   LAYER_1< / div >
< div class = "line" > < a name = "l01018" > < / a > < span class = "lineno" > 1018< / span >   };< / div >
< div class = "line" > < a name = "l01019" > < / a > < span class = "lineno" > 1019< / span >   < / div >
< div class = "line" > < a name = "l01020" > < / a > < span class = "lineno" > 1020< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > kSampleRateTable[4][4] = { { 11025, 12000, 8000, 0 }, < span class = "comment" > // v2.5< / span > < / div >
< div class = "line" > < a name = "l01021" > < / a > < span class = "lineno" > 1021< / span >   { 0, 0, 0, 0 }, < span class = "comment" > // not used< / span > < / div >
< div class = "line" > < a name = "l01022" > < / a > < span class = "lineno" > 1022< / span >   { 22050, 24000, 16000, 0 }, < span class = "comment" > // v2< / span > < / div >
< div class = "line" > < a name = "l01023" > < / a > < span class = "lineno" > 1023< / span >   { 44100, 48000, 32000, 0 } < span class = "comment" > // v1< / span > < / div >
< div class = "line" > < a name = "l01024" > < / a > < span class = "lineno" > 1024< / span >   };< / div >
< div class = "line" > < a name = "l01025" > < / a > < span class = "lineno" > 1025< / span >   < / div >
< div class = "line" > < a name = "l01026" > < / a > < span class = "lineno" > 1026< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > kBitRateTableV1L1[16] = { 0, 32, 64, 96, 128, 160, 192, 224, 256,< / div >
< div class = "line" > < a name = "l01027" > < / a > < span class = "lineno" > 1027< / span >   288, 320, 352, 384, 416, 448, 0 };< / div >
< div class = "line" > < a name = "l01028" > < / a > < span class = "lineno" > 1028< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > kBitRateTableV1L2[16] = { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160,< / div >
< div class = "line" > < a name = "l01029" > < / a > < span class = "lineno" > 1029< / span >   192, 224, 256, 320, 384, 0 };< / div >
< div class = "line" > < a name = "l01030" > < / a > < span class = "lineno" > 1030< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > kBitRateTableV1L3[16] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128,< / div >
< div class = "line" > < a name = "l01031" > < / a > < span class = "lineno" > 1031< / span >   160, 192, 224, 256, 320, 0 };< / div >
< div class = "line" > < a name = "l01032" > < / a > < span class = "lineno" > 1032< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > kBitRateTableV2L1[16] = { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144,< / div >
< div class = "line" > < a name = "l01033" > < / a > < span class = "lineno" > 1033< / span >   160, 176, 192, 224, 256, 0 };< / div >
< div class = "line" > < a name = "l01034" > < / a > < span class = "lineno" > 1034< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > kBitRateTableV2L23[16] = { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,< / div >
< div class = "line" > < a name = "l01035" > < / a > < span class = "lineno" > 1035< / span >   112, 128, 144, 160, 0 };< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01036" > < / a > < span class = "lineno" > 1036< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01037" > < / a > < span class = "lineno" > 1037< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > ValidMpegAudioFrameHeader(< span class = "keyword" > const< / span > uint8_t* header,< / div >
< div class = "line" > < a name = "l01038" > < / a > < span class = "lineno" > 1038< / span >   < span class = "keywordtype" > int< / span > header_size,< / div >
< div class = "line" > < a name = "l01039" > < / a > < span class = "lineno" > 1039< / span >   < span class = "keywordtype" > int< / span > * framesize) {< / div >
< div class = "line" > < a name = "l01040" > < / a > < span class = "lineno" > 1040< / span >   < span class = "comment" > // Reference: http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm.< / span > < / div >
< div class = "line" > < a name = "l01041" > < / a > < span class = "lineno" > 1041< / span >   DCHECK_GE(header_size, 4);< / div >
< div class = "line" > < a name = "l01042" > < / a > < span class = "lineno" > 1042< / span >   *framesize = 0;< / div >
< div class = "line" > < a name = "l01043" > < / a > < span class = "lineno" > 1043< / span >   BitReader reader(header, 4); < span class = "comment" > // Header can only be 4 bytes long.< / span > < / div >
< div class = "line" > < a name = "l01044" > < / a > < span class = "lineno" > 1044< / span >   < / div >
< div class = "line" > < a name = "l01045" > < / a > < span class = "lineno" > 1045< / span >   < span class = "comment" > // Verify frame sync (11 bits) are all set.< / span > < / div >
< div class = "line" > < a name = "l01046" > < / a > < span class = "lineno" > 1046< / span >   RCHECK(ReadBits(& reader, 11) == 0x7ff);< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01047" > < / a > < span class = "lineno" > 1047< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01048" > < / a > < span class = "lineno" > 1048< / span >   < span class = "comment" > // Verify MPEG audio version id.< / span > < / div >
< div class = "line" > < a name = "l01049" > < / a > < span class = "lineno" > 1049< / span >   < span class = "keywordtype" > int< / span > version = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l01050" > < / a > < span class = "lineno" > 1050< / span >   RCHECK(version != 1); < span class = "comment" > // Reserved.< / span > < / div >
< div class = "line" > < a name = "l01051" > < / a > < span class = "lineno" > 1051< / span >   < / div >
< div class = "line" > < a name = "l01052" > < / a > < span class = "lineno" > 1052< / span >   < span class = "comment" > // Verify layer.< / span > < / div >
< div class = "line" > < a name = "l01053" > < / a > < span class = "lineno" > 1053< / span >   < span class = "keywordtype" > int< / span > layer = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l01054" > < / a > < span class = "lineno" > 1054< / span >   RCHECK(layer != 0);< / div >
< div class = "line" > < a name = "l01055" > < / a > < span class = "lineno" > 1055< / span >   < / div >
< div class = "line" > < a name = "l01056" > < / a > < span class = "lineno" > 1056< / span >   < span class = "comment" > // Skip protection bit.< / span > < / div >
< div class = "line" > < a name = "l01057" > < / a > < span class = "lineno" > 1057< / span >   reader.SkipBits(1);< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01058" > < / a > < span class = "lineno" > 1058< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01059" > < / a > < span class = "lineno" > 1059< / span >   < span class = "comment" > // Verify bitrate index.< / span > < / div >
< div class = "line" > < a name = "l01060" > < / a > < span class = "lineno" > 1060< / span >   < span class = "keywordtype" > int< / span > bitrate_index = ReadBits(& reader, 4);< / div >
< div class = "line" > < a name = "l01061" > < / a > < span class = "lineno" > 1061< / span >   RCHECK(bitrate_index != 0xf);< / div >
< div class = "line" > < a name = "l01062" > < / a > < span class = "lineno" > 1062< / span >   < / div >
< div class = "line" > < a name = "l01063" > < / a > < span class = "lineno" > 1063< / span >   < span class = "comment" > // Verify sampling rate frequency index.< / span > < / div >
< div class = "line" > < a name = "l01064" > < / a > < span class = "lineno" > 1064< / span >   < span class = "keywordtype" > int< / span > sampling_index = ReadBits(& reader, 2);< / div >
< div class = "line" > < a name = "l01065" > < / a > < span class = "lineno" > 1065< / span >   RCHECK(sampling_index != 3);< / div >
< div class = "line" > < a name = "l01066" > < / a > < span class = "lineno" > 1066< / span >   < / div >
< div class = "line" > < a name = "l01067" > < / a > < span class = "lineno" > 1067< / span >   < span class = "comment" > // Get padding bit.< / span > < / div >
< div class = "line" > < a name = "l01068" > < / a > < span class = "lineno" > 1068< / span >   < span class = "keywordtype" > int< / span > padding = ReadBits(& reader, 1);< / div >
< div class = "line" > < a name = "l01069" > < / a > < span class = "lineno" > 1069< / span >   < / div >
< div class = "line" > < a name = "l01070" > < / a > < span class = "lineno" > 1070< / span >   < span class = "comment" > // Frame size:< / span > < / div >
< div class = "line" > < a name = "l01071" > < / a > < span class = "lineno" > 1071< / span >   < span class = "comment" > // For Layer I files = (12 * BitRate / SampleRate + Padding) * 4< / span > < / div >
< div class = "line" > < a name = "l01072" > < / a > < span class = "lineno" > 1072< / span >   < span class = "comment" > // For others = 144 * BitRate / SampleRate + Padding< / span > < / div >
< div class = "line" > < a name = "l01073" > < / a > < span class = "lineno" > 1073< / span >   < span class = "comment" > // Unfortunately, BitRate and SampleRate are coded.< / span > < / div >
< div class = "line" > < a name = "l01074" > < / a > < span class = "lineno" > 1074< / span >   < span class = "keywordtype" > int< / span > sampling_rate = kSampleRateTable[version][sampling_index];< / div >
< div class = "line" > < a name = "l01075" > < / a > < span class = "lineno" > 1075< / span >   < span class = "keywordtype" > int< / span > bitrate;< / div >
< div class = "line" > < a name = "l01076" > < / a > < span class = "lineno" > 1076< / span >   < span class = "keywordflow" > if< / span > (version == VERSION_1) {< / div >
< div class = "line" > < a name = "l01077" > < / a > < span class = "lineno" > 1077< / span >   < span class = "keywordflow" > if< / span > (layer == LAYER_1)< / div >
< div class = "line" > < a name = "l01078" > < / a > < span class = "lineno" > 1078< / span >   bitrate = kBitRateTableV1L1[bitrate_index];< / div >
< div class = "line" > < a name = "l01079" > < / a > < span class = "lineno" > 1079< / span >   < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (layer == LAYER_2)< / div >
< div class = "line" > < a name = "l01080" > < / a > < span class = "lineno" > 1080< / span >   bitrate = kBitRateTableV1L2[bitrate_index];< / div >
< div class = "line" > < a name = "l01081" > < / a > < span class = "lineno" > 1081< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l01082" > < / a > < span class = "lineno" > 1082< / span >   bitrate = kBitRateTableV1L3[bitrate_index];< / div >
< div class = "line" > < a name = "l01083" > < / a > < span class = "lineno" > 1083< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l01084" > < / a > < span class = "lineno" > 1084< / span >   < span class = "keywordflow" > if< / span > (layer == LAYER_1)< / div >
< div class = "line" > < a name = "l01085" > < / a > < span class = "lineno" > 1085< / span >   bitrate = kBitRateTableV2L1[bitrate_index];< / div >
< div class = "line" > < a name = "l01086" > < / a > < span class = "lineno" > 1086< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l01087" > < / a > < span class = "lineno" > 1087< / span >   bitrate = kBitRateTableV2L23[bitrate_index];< / div >
< div class = "line" > < a name = "l01088" > < / a > < span class = "lineno" > 1088< / span >   }< / div >
< div class = "line" > < a name = "l01089" > < / a > < span class = "lineno" > 1089< / span >   < span class = "keywordflow" > if< / span > (layer == LAYER_1)< / div >
< div class = "line" > < a name = "l01090" > < / a > < span class = "lineno" > 1090< / span >   *framesize = ((12000 * bitrate) / sampling_rate + padding) * 4;< / div >
< div class = "line" > < a name = "l01091" > < / a > < span class = "lineno" > 1091< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l01092" > < / a > < span class = "lineno" > 1092< / span >   *framesize = (144000 * bitrate) / sampling_rate + padding;< / div >
< div class = "line" > < a name = "l01093" > < / a > < span class = "lineno" > 1093< / span >   < span class = "keywordflow" > return< / span > (bitrate > 0 & & sampling_rate > 0);< / div >
< div class = "line" > < a name = "l01094" > < / a > < span class = "lineno" > 1094< / span >   }< / div >
< div class = "line" > < a name = "l01095" > < / a > < span class = "lineno" > 1095< / span >   < / div >
< div class = "line" > < a name = "l01096" > < / a > < span class = "lineno" > 1096< / span >   < span class = "comment" > // Extract a size encoded the MP3 way.< / span > < / div >
< div class = "line" > < a name = "l01097" > < / a > < span class = "lineno" > 1097< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > GetMp3HeaderSize(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01098" > < / a > < span class = "lineno" > 1098< / span >   DCHECK_GE(buffer_size, 9);< / div >
< div class = "line" > < a name = "l01099" > < / a > < span class = "lineno" > 1099< / span >   < span class = "keywordtype" > int< / span > size = ((buffer[6] & 0x7f) < < 21) + ((buffer[7] & 0x7f) < < 14) +< / div >
< div class = "line" > < a name = "l01100" > < / a > < span class = "lineno" > 1100< / span >   ((buffer[8] & 0x7f) < < 7) + (buffer[9] & 0x7f) + 10;< / div >
< div class = "line" > < a name = "l01101" > < / a > < span class = "lineno" > 1101< / span >   < span class = "keywordflow" > if< / span > (buffer[5] & 0x10) < span class = "comment" > // Footer added?< / span > < / div >
< div class = "line" > < a name = "l01102" > < / a > < span class = "lineno" > 1102< / span >   size += 10;< / div >
< div class = "line" > < a name = "l01103" > < / a > < span class = "lineno" > 1103< / span >   < span class = "keywordflow" > return< / span > size;< / div >
< div class = "line" > < a name = "l01104" > < / a > < span class = "lineno" > 1104< / span >   }< / div >
< div class = "line" > < a name = "l01105" > < / a > < span class = "lineno" > 1105< / span >   < / div >
< div class = "line" > < a name = "l01106" > < / a > < span class = "lineno" > 1106< / span >   < span class = "comment" > // Additional checks for a MP3 container.< / span > < / div >
< div class = "line" > < a name = "l01107" > < / a > < span class = "lineno" > 1107< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckMp3(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size, < span class = "keywordtype" > bool< / span > seenHeader) {< / div >
< div class = "line" > < a name = "l01108" > < / a > < span class = "lineno" > 1108< / span >   RCHECK(buffer_size > = 10); < span class = "comment" > // Must be enough to read the initial header.< / span > < / div >
< div class = "line" > < a name = "l01109" > < / a > < span class = "lineno" > 1109< / span >   < / div >
< div class = "line" > < a name = "l01110" > < / a > < span class = "lineno" > 1110< / span >   < span class = "keywordtype" > int< / span > framesize;< / div >
< div class = "line" > < a name = "l01111" > < / a > < span class = "lineno" > 1111< / span >   < span class = "keywordtype" > int< / span > numSeen = 0;< / div >
< div class = "line" > < a name = "l01112" > < / a > < span class = "lineno" > 1112< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l01113" > < / a > < span class = "lineno" > 1113< / span >   < span class = "keywordflow" > if< / span > (seenHeader) {< / div >
< div class = "line" > < a name = "l01114" > < / a > < span class = "lineno" > 1114< / span >   offset = GetMp3HeaderSize(buffer, buffer_size);< / div >
< div class = "line" > < a name = "l01115" > < / a > < span class = "lineno" > 1115< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l01116" > < / a > < span class = "lineno" > 1116< / span >   < span class = "comment" > // Skip over leading 0' s.< / span > < / div >
< div class = "line" > < a name = "l01117" > < / a > < span class = "lineno" > 1117< / span >   < span class = "keywordflow" > while< / span > (offset < buffer_size & & buffer[offset] == 0)< / div >
< div class = "line" > < a name = "l01118" > < / a > < span class = "lineno" > 1118< / span >   ++offset;< / div >
< div class = "line" > < a name = "l01119" > < / a > < span class = "lineno" > 1119< / span >   }< / div >
< div class = "line" > < a name = "l01120" > < / a > < span class = "lineno" > 1120< / span >   < / div >
< div class = "line" > < a name = "l01121" > < / a > < span class = "lineno" > 1121< / span >   < span class = "keywordflow" > while< / span > (offset + 3 < buffer_size) {< / div >
< div class = "line" > < a name = "l01122" > < / a > < span class = "lineno" > 1122< / span >   RCHECK(ValidMpegAudioFrameHeader(< / div >
< div class = "line" > < a name = "l01123" > < / a > < span class = "lineno" > 1123< / span >   buffer + offset, buffer_size - offset, & framesize));< / div >
< div class = "line" > < a name = "l01124" > < / a > < span class = "lineno" > 1124< / span >   < / div >
< div class = "line" > < a name = "l01125" > < / a > < span class = "lineno" > 1125< / span >   < span class = "comment" > // Have we seen enough valid headers?< / span > < / div >
< div class = "line" > < a name = "l01126" > < / a > < span class = "lineno" > 1126< / span >   < span class = "keywordflow" > if< / span > (++numSeen > 10)< / div >
< div class = "line" > < a name = "l01127" > < / a > < span class = "lineno" > 1127< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l01128" > < / a > < span class = "lineno" > 1128< / span >   offset += framesize;< / div >
< div class = "line" > < a name = "l01129" > < / a > < span class = "lineno" > 1129< / span >   }< / div >
< div class = "line" > < a name = "l01130" > < / a > < span class = "lineno" > 1130< / span >   < span class = "comment" > // Off the end of the buffer, return success if a few valid headers seen.< / span > < / div >
< div class = "line" > < a name = "l01131" > < / a > < span class = "lineno" > 1131< / span >   < span class = "keywordflow" > return< / span > numSeen > 2;< / div >
< div class = "line" > < a name = "l01132" > < / a > < span class = "lineno" > 1132< / span >   }< / div >
< div class = "line" > < a name = "l01133" > < / a > < span class = "lineno" > 1133< / span >   < / div >
< div class = "line" > < a name = "l01134" > < / a > < span class = "lineno" > 1134< / span >   < span class = "comment" > // Check that the next characters in |buffer| represent a number. The format< / span > < / div >
< div class = "line" > < a name = "l01135" > < / a > < span class = "lineno" > 1135< / span >   < span class = "comment" > // accepted is optional whitespace followed by 1 or more digits. |max_digits|< / span > < / div >
< div class = "line" > < a name = "l01136" > < / a > < span class = "lineno" > 1136< / span >   < span class = "comment" > // specifies the maximum number of digits to process. Returns true if a valid< / span > < / div >
< div class = "line" > < a name = "l01137" > < / a > < span class = "lineno" > 1137< / span >   < span class = "comment" > // number is found, false otherwise.< / span > < / div >
< div class = "line" > < a name = "l01138" > < / a > < span class = "lineno" > 1138< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > VerifyNumber(< span class = "keyword" > const< / span > uint8_t* buffer,< / div >
< div class = "line" > < a name = "l01139" > < / a > < span class = "lineno" > 1139< / span >   < span class = "keywordtype" > int< / span > buffer_size,< / div >
< div class = "line" > < a name = "l01140" > < / a > < span class = "lineno" > 1140< / span >   < span class = "keywordtype" > int< / span > * offset,< / div >
< div class = "line" > < a name = "l01141" > < / a > < span class = "lineno" > 1141< / span >   < span class = "keywordtype" > int< / span > max_digits) {< / div >
< div class = "line" > < a name = "l01142" > < / a > < span class = "lineno" > 1142< / span >   RCHECK(*offset < buffer_size);< / div >
< div class = "line" > < a name = "l01143" > < / a > < span class = "lineno" > 1143< / span >   < / div >
< div class = "line" > < a name = "l01144" > < / a > < span class = "lineno" > 1144< / span >   < span class = "comment" > // Skip over any leading space.< / span > < / div >
< div class = "line" > < a name = "l01145" > < / a > < span class = "lineno" > 1145< / span >   < span class = "keywordflow" > while< / span > (isspace(buffer[*offset])) {< / div >
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< div class = "line" > < a name = "l01146" > < / a > < span class = "lineno" > 1146< / span >   ++(*offset);< / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01147" > < / a > < span class = "lineno" > 1147< / span >   RCHECK(*offset < buffer_size);< / div >
< div class = "line" > < a name = "l01148" > < / a > < span class = "lineno" > 1148< / span >   }< / div >
< div class = "line" > < a name = "l01149" > < / a > < span class = "lineno" > 1149< / span >   < / div >
< div class = "line" > < a name = "l01150" > < / a > < span class = "lineno" > 1150< / span >   < span class = "comment" > // Need to process up to max_digits digits.< / span > < / div >
< div class = "line" > < a name = "l01151" > < / a > < span class = "lineno" > 1151< / span >   < span class = "keywordtype" > int< / span > numSeen = 0;< / div >
< div class = "line" > < a name = "l01152" > < / a > < span class = "lineno" > 1152< / span >   < span class = "keywordflow" > while< / span > (--max_digits > = 0 & & isdigit(buffer[*offset])) {< / div >
< div class = "line" > < a name = "l01153" > < / a > < span class = "lineno" > 1153< / span >   ++numSeen;< / div >
< div class = "line" > < a name = "l01154" > < / a > < span class = "lineno" > 1154< / span >   ++(*offset);< / div >
< div class = "line" > < a name = "l01155" > < / a > < span class = "lineno" > 1155< / span >   < span class = "keywordflow" > if< / span > (*offset > = buffer_size)< / div >
< div class = "line" > < a name = "l01156" > < / a > < span class = "lineno" > 1156< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ; < span class = "comment" > // Out of space but seen a digit.< / span > < / div >
< div class = "line" > < a name = "l01157" > < / a > < span class = "lineno" > 1157< / span >   }< / div >
< div class = "line" > < a name = "l01158" > < / a > < span class = "lineno" > 1158< / span >   < / div >
< div class = "line" > < a name = "l01159" > < / a > < span class = "lineno" > 1159< / span >   < span class = "comment" > // Success if at least one digit seen.< / span > < / div >
< div class = "line" > < a name = "l01160" > < / a > < span class = "lineno" > 1160< / span >   < span class = "keywordflow" > return< / span > (numSeen > 0);< / div >
< div class = "line" > < a name = "l01161" > < / a > < span class = "lineno" > 1161< / span >   }< / div >
< div class = "line" > < a name = "l01162" > < / a > < span class = "lineno" > 1162< / span >   < / div >
< div class = "line" > < a name = "l01163" > < / a > < span class = "lineno" > 1163< / span >   < span class = "comment" > // Check that the next character in |buffer| is one of |c1| or |c2|. |c2| is< / span > < / div >
< div class = "line" > < a name = "l01164" > < / a > < span class = "lineno" > 1164< / span >   < span class = "comment" > // optional. Returns true if there is a match, false if no match or out of< / span > < / div >
< div class = "line" > < a name = "l01165" > < / a > < span class = "lineno" > 1165< / span >   < span class = "comment" > // space.< / span > < / div >
< div class = "line" > < a name = "l01166" > < / a > < span class = "lineno" > 1166< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > inline< / span > < span class = "keywordtype" > bool< / span > VerifyCharacters(< span class = "keyword" > const< / span > uint8_t* buffer,< / div >
< div class = "line" > < a name = "l01167" > < / a > < span class = "lineno" > 1167< / span >   < span class = "keywordtype" > int< / span > buffer_size,< / div >
< div class = "line" > < a name = "l01168" > < / a > < span class = "lineno" > 1168< / span >   < span class = "keywordtype" > int< / span > * offset,< / div >
< div class = "line" > < a name = "l01169" > < / a > < span class = "lineno" > 1169< / span >   < span class = "keywordtype" > char< / span > c1,< / div >
< div class = "line" > < a name = "l01170" > < / a > < span class = "lineno" > 1170< / span >   < span class = "keywordtype" > char< / span > c2) {< / div >
< div class = "line" > < a name = "l01171" > < / a > < span class = "lineno" > 1171< / span >   RCHECK(*offset < buffer_size);< / div >
< div class = "line" > < a name = "l01172" > < / a > < span class = "lineno" > 1172< / span >   < span class = "keywordtype" > char< / span > c = < span class = "keyword" > static_cast< < / span > < span class = "keywordtype" > char< / span > < span class = "keyword" > > < / span > (buffer[(*offset)++]);< / div >
< div class = "line" > < a name = "l01173" > < / a > < span class = "lineno" > 1173< / span >   < span class = "keywordflow" > return< / span > (c == c1 || (c == c2 & & c2 != 0));< / div >
< div class = "line" > < a name = "l01174" > < / a > < span class = "lineno" > 1174< / span >   }< / div >
< div class = "line" > < a name = "l01175" > < / a > < span class = "lineno" > 1175< / span >   < / div >
< div class = "line" > < a name = "l01176" > < / a > < span class = "lineno" > 1176< / span >   < span class = "comment" > // Checks for a SRT container.< / span > < / div >
< div class = "line" > < a name = "l01177" > < / a > < span class = "lineno" > 1177< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckSrt(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01178" > < / a > < span class = "lineno" > 1178< / span >   < span class = "comment" > // Reference: http://en.wikipedia.org/wiki/SubRip< / span > < / div >
< div class = "line" > < a name = "l01179" > < / a > < span class = "lineno" > 1179< / span >   RCHECK(buffer_size > 20);< / div >
< div class = "line" > < a name = "l01180" > < / a > < span class = "lineno" > 1180< / span >   < / div >
< div class = "line" > < a name = "l01181" > < / a > < span class = "lineno" > 1181< / span >   < span class = "comment" > // First line should just be the subtitle sequence number.< / span > < / div >
< div class = "line" > < a name = "l01182" > < / a > < span class = "lineno" > 1182< / span >   < span class = "keywordtype" > int< / span > offset = StartsWith(buffer, buffer_size, UTF8_BYTE_ORDER_MARK) ? 3 : 0;< / div >
< div class = "line" > < a name = "l01183" > < / a > < span class = "lineno" > 1183< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 100));< / div >
< div class = "line" > < a name = "l01184" > < / a > < span class = "lineno" > 1184< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' \n' < / span > , < span class = "charliteral" > ' \r' < / span > ));< / div >
< div class = "line" > < a name = "l01185" > < / a > < span class = "lineno" > 1185< / span >   < / div >
< div class = "line" > < a name = "l01186" > < / a > < span class = "lineno" > 1186< / span >   < span class = "comment" > // Skip any additional \n\r.< / span > < / div >
< div class = "line" > < a name = "l01187" > < / a > < span class = "lineno" > 1187< / span >   < span class = "keywordflow" > while< / span > (VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' \n' < / span > , < span class = "charliteral" > ' \r' < / span > )) {}< / div >
< div class = "line" > < a name = "l01188" > < / a > < span class = "lineno" > 1188< / span >   --offset; < span class = "comment" > // Since VerifyCharacters() gobbled up the next non-CR/LF.< / span > < / div >
< div class = "line" > < a name = "l01189" > < / a > < span class = "lineno" > 1189< / span >   < / div >
< div class = "line" > < a name = "l01190" > < / a > < span class = "lineno" > 1190< / span >   < span class = "comment" > // Second line should look like the following:< / span > < / div >
< div class = "line" > < a name = "l01191" > < / a > < span class = "lineno" > 1191< / span >   < span class = "comment" > // 00:00:10,500 --> 00:00:13,000< / span > < / div >
< div class = "line" > < a name = "l01192" > < / a > < span class = "lineno" > 1192< / span >   < span class = "comment" > // Units separator can be , or .< / span > < / div >
< div class = "line" > < a name = "l01193" > < / a > < span class = "lineno" > 1193< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 100));< / div >
< div class = "line" > < a name = "l01194" > < / a > < span class = "lineno" > 1194< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' :' < / span > , 0));< / div >
< div class = "line" > < a name = "l01195" > < / a > < span class = "lineno" > 1195< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 2));< / div >
< div class = "line" > < a name = "l01196" > < / a > < span class = "lineno" > 1196< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' :' < / span > , 0));< / div >
< div class = "line" > < a name = "l01197" > < / a > < span class = "lineno" > 1197< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 2));< / div >
< div class = "line" > < a name = "l01198" > < / a > < span class = "lineno" > 1198< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' ,' < / span > , < span class = "charliteral" > ' .' < / span > ));< / div >
< div class = "line" > < a name = "l01199" > < / a > < span class = "lineno" > 1199< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 3));< / div >
< div class = "line" > < a name = "l01200" > < / a > < span class = "lineno" > 1200< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' ' < / span > , 0));< / div >
< div class = "line" > < a name = "l01201" > < / a > < span class = "lineno" > 1201< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' -' < / span > , 0));< / div >
< div class = "line" > < a name = "l01202" > < / a > < span class = "lineno" > 1202< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' -' < / span > , 0));< / div >
< div class = "line" > < a name = "l01203" > < / a > < span class = "lineno" > 1203< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' > ' < / span > , 0));< / div >
< div class = "line" > < a name = "l01204" > < / a > < span class = "lineno" > 1204< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' ' < / span > , 0));< / div >
< div class = "line" > < a name = "l01205" > < / a > < span class = "lineno" > 1205< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 100));< / div >
< div class = "line" > < a name = "l01206" > < / a > < span class = "lineno" > 1206< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' :' < / span > , 0));< / div >
< div class = "line" > < a name = "l01207" > < / a > < span class = "lineno" > 1207< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 2));< / div >
< div class = "line" > < a name = "l01208" > < / a > < span class = "lineno" > 1208< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' :' < / span > , 0));< / div >
< div class = "line" > < a name = "l01209" > < / a > < span class = "lineno" > 1209< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 2));< / div >
< div class = "line" > < a name = "l01210" > < / a > < span class = "lineno" > 1210< / span >   RCHECK(VerifyCharacters(buffer, buffer_size, & offset, < span class = "charliteral" > ' ,' < / span > , < span class = "charliteral" > ' .' < / span > ));< / div >
< div class = "line" > < a name = "l01211" > < / a > < span class = "lineno" > 1211< / span >   RCHECK(VerifyNumber(buffer, buffer_size, & offset, 3));< / div >
< div class = "line" > < a name = "l01212" > < / a > < span class = "lineno" > 1212< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l01213" > < / a > < span class = "lineno" > 1213< / span >   }< / div >
< div class = "line" > < a name = "l01214" > < / a > < span class = "lineno" > 1214< / span >   < / div >
< div class = "line" > < a name = "l01215" > < / a > < span class = "lineno" > 1215< / span >   < span class = "comment" > // Read a Matroska Element Id.< / span > < / div >
< div class = "line" > < a name = "l01216" > < / a > < span class = "lineno" > 1216< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > GetElementId(BitReader* reader) {< / div >
< div class = "line" > < a name = "l01217" > < / a > < span class = "lineno" > 1217< / span >   < span class = "comment" > // Element ID is coded with the leading zero bits (max 3) determining size.< / span > < / div >
< div class = "line" > < a name = "l01218" > < / a > < span class = "lineno" > 1218< / span >   < span class = "comment" > // If it is an invalid encoding or the end of the buffer is reached,< / span > < / div >
< div class = "line" > < a name = "l01219" > < / a > < span class = "lineno" > 1219< / span >   < span class = "comment" > // return -1 as a tag that won' t be expected.< / span > < / div >
< div class = "line" > < a name = "l01220" > < / a > < span class = "lineno" > 1220< / span >   < span class = "keywordflow" > if< / span > (reader-> bits_available() > = 8) {< / div >
< div class = "line" > < a name = "l01221" > < / a > < span class = "lineno" > 1221< / span >   < span class = "keywordtype" > int< / span > num_bits_to_read = 0;< / div >
< div class = "line" > < a name = "l01222" > < / a > < span class = "lineno" > 1222< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > int< / span > prefix[] = { 0x80, 0x4000, 0x200000, 0x10000000 };< / div >
< div class = "line" > < a name = "l01223" > < / a > < span class = "lineno" > 1223< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < 4; ++i) {< / div >
< div class = "line" > < a name = "l01224" > < / a > < span class = "lineno" > 1224< / span >   num_bits_to_read += 7;< / div >
< div class = "line" > < a name = "l01225" > < / a > < span class = "lineno" > 1225< / span >   < span class = "keywordflow" > if< / span > (ReadBits(reader, 1) == 1) {< / div >
< div class = "line" > < a name = "l01226" > < / a > < span class = "lineno" > 1226< / span >   < span class = "keywordflow" > if< / span > (reader-> bits_available() < num_bits_to_read)< / div >
< div class = "line" > < a name = "l01227" > < / a > < span class = "lineno" > 1227< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01228" > < / a > < span class = "lineno" > 1228< / span >   < span class = "comment" > // prefix[] adds back the bits read individually.< / span > < / div >
< div class = "line" > < a name = "l01229" > < / a > < span class = "lineno" > 1229< / span >   < span class = "keywordflow" > return< / span > ReadBits(reader, num_bits_to_read) | prefix[i];< / div >
< div class = "line" > < a name = "l01230" > < / a > < span class = "lineno" > 1230< / span >   }< / div >
< div class = "line" > < a name = "l01231" > < / a > < span class = "lineno" > 1231< / span >   }< / div >
< div class = "line" > < a name = "l01232" > < / a > < span class = "lineno" > 1232< / span >   }< / div >
< div class = "line" > < a name = "l01233" > < / a > < span class = "lineno" > 1233< / span >   < span class = "comment" > // Invalid encoding, return something not expected.< / span > < / div >
< div class = "line" > < a name = "l01234" > < / a > < span class = "lineno" > 1234< / span >   < span class = "keywordflow" > return< / span > -1;< / div >
< div class = "line" > < a name = "l01235" > < / a > < span class = "lineno" > 1235< / span >   }< / div >
< div class = "line" > < a name = "l01236" > < / a > < span class = "lineno" > 1236< / span >   < / div >
< div class = "line" > < a name = "l01237" > < / a > < span class = "lineno" > 1237< / span >   < span class = "comment" > // Read a Matroska Unsigned Integer (VINT).< / span > < / div >
< div class = "line" > < a name = "l01238" > < / a > < span class = "lineno" > 1238< / span >   < span class = "keyword" > static< / span > uint64_t GetVint(BitReader* reader) {< / div >
< div class = "line" > < a name = "l01239" > < / a > < span class = "lineno" > 1239< / span >   < span class = "comment" > // Values are coded with the leading zero bits (max 7) determining size.< / span > < / div >
< div class = "line" > < a name = "l01240" > < / a > < span class = "lineno" > 1240< / span >   < span class = "comment" > // If it is an invalid coding or the end of the buffer is reached,< / span > < / div >
< div class = "line" > < a name = "l01241" > < / a > < span class = "lineno" > 1241< / span >   < span class = "comment" > // return something that will go off the end of the buffer.< / span > < / div >
< div class = "line" > < a name = "l01242" > < / a > < span class = "lineno" > 1242< / span >   < span class = "keywordflow" > if< / span > (reader-> bits_available() > = 8) {< / div >
< div class = "line" > < a name = "l01243" > < / a > < span class = "lineno" > 1243< / span >   < span class = "keywordtype" > int< / span > num_bits_to_read = 0;< / div >
< div class = "line" > < a name = "l01244" > < / a > < span class = "lineno" > 1244< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < 8; ++i) {< / div >
< div class = "line" > < a name = "l01245" > < / a > < span class = "lineno" > 1245< / span >   num_bits_to_read += 7;< / div >
< div class = "line" > < a name = "l01246" > < / a > < span class = "lineno" > 1246< / span >   < span class = "keywordflow" > if< / span > (ReadBits(reader, 1) == 1) {< / div >
< div class = "line" > < a name = "l01247" > < / a > < span class = "lineno" > 1247< / span >   < span class = "keywordflow" > if< / span > (reader-> bits_available() < num_bits_to_read)< / div >
< div class = "line" > < a name = "l01248" > < / a > < span class = "lineno" > 1248< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01249" > < / a > < span class = "lineno" > 1249< / span >   < span class = "keywordflow" > return< / span > ReadBits(reader, num_bits_to_read);< / div >
< div class = "line" > < a name = "l01250" > < / a > < span class = "lineno" > 1250< / span >   }< / div >
< div class = "line" > < a name = "l01251" > < / a > < span class = "lineno" > 1251< / span >   }< / div >
< div class = "line" > < a name = "l01252" > < / a > < span class = "lineno" > 1252< / span >   }< / div >
< div class = "line" > < a name = "l01253" > < / a > < span class = "lineno" > 1253< / span >   < span class = "comment" > // Incorrect format (more than 7 leading 0' s) or off the end of the buffer.< / span > < / div >
< div class = "line" > < a name = "l01254" > < / a > < span class = "lineno" > 1254< / span >   < span class = "comment" > // Since the return value is used as a byte size, return a value that will< / span > < / div >
< div class = "line" > < a name = "l01255" > < / a > < span class = "lineno" > 1255< / span >   < span class = "comment" > // cause a failure when used.< / span > < / div >
< div class = "line" > < a name = "l01256" > < / a > < span class = "lineno" > 1256< / span >   < span class = "keywordflow" > return< / span > (reader-> bits_available() / 8) + 2;< / div >
< div class = "line" > < a name = "l01257" > < / a > < span class = "lineno" > 1257< / span >   }< / div >
< div class = "line" > < a name = "l01258" > < / a > < span class = "lineno" > 1258< / span >   < / div >
< div class = "line" > < a name = "l01259" > < / a > < span class = "lineno" > 1259< / span >   < span class = "comment" > // Additional checks for a WEBM container.< / span > < / div >
< div class = "line" > < a name = "l01260" > < / a > < span class = "lineno" > 1260< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckWebm(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01261" > < / a > < span class = "lineno" > 1261< / span >   < span class = "comment" > // Reference: http://www.matroska.org/technical/specs/index.html< / span > < / div >
< div class = "line" > < a name = "l01262" > < / a > < span class = "lineno" > 1262< / span >   RCHECK(buffer_size > 12);< / div >
< div class = "line" > < a name = "l01263" > < / a > < span class = "lineno" > 1263< / span >   < / div >
< div class = "line" > < a name = "l01264" > < / a > < span class = "lineno" > 1264< / span >   BitReader reader(buffer, buffer_size);< / div >
< div class = "line" > < a name = "l01265" > < / a > < span class = "lineno" > 1265< / span >   < / div >
< div class = "line" > < a name = "l01266" > < / a > < span class = "lineno" > 1266< / span >   < span class = "comment" > // Verify starting Element Id.< / span > < / div >
< div class = "line" > < a name = "l01267" > < / a > < span class = "lineno" > 1267< / span >   RCHECK(GetElementId(& reader) == 0x1a45dfa3);< / div >
< div class = "line" > < a name = "l01268" > < / a > < span class = "lineno" > 1268< / span >   < / div >
< div class = "line" > < a name = "l01269" > < / a > < span class = "lineno" > 1269< / span >   < span class = "comment" > // Get the header size, and ensure there are enough bits to check.< / span > < / div >
< div class = "line" > < a name = "l01270" > < / a > < span class = "lineno" > 1270< / span >   < span class = "keywordtype" > int< / span > header_size = GetVint(& reader);< / div >
< div class = "line" > < a name = "l01271" > < / a > < span class = "lineno" > 1271< / span >   RCHECK(reader.bits_available() / 8 > = header_size);< / div >
< div class = "line" > < a name = "l01272" > < / a > < span class = "lineno" > 1272< / span >   < / div >
< div class = "line" > < a name = "l01273" > < / a > < span class = "lineno" > 1273< / span >   < span class = "comment" > // Loop through the header.< / span > < / div >
< div class = "line" > < a name = "l01274" > < / a > < span class = "lineno" > 1274< / span >   < span class = "keywordflow" > while< / span > (reader.bits_available() > 0) {< / div >
< div class = "line" > < a name = "l01275" > < / a > < span class = "lineno" > 1275< / span >   < span class = "keywordtype" > int< / span > tag = GetElementId(& reader);< / div >
< div class = "line" > < a name = "l01276" > < / a > < span class = "lineno" > 1276< / span >   < span class = "keywordtype" > int< / span > tagsize = GetVint(& reader);< / div >
< div class = "line" > < a name = "l01277" > < / a > < span class = "lineno" > 1277< / span >   < span class = "keywordflow" > switch< / span > (tag) {< / div >
< div class = "line" > < a name = "l01278" > < / a > < span class = "lineno" > 1278< / span >   < span class = "keywordflow" > case< / span > 0x4286: < span class = "comment" > // EBMLVersion< / span > < / div >
< div class = "line" > < a name = "l01279" > < / a > < span class = "lineno" > 1279< / span >   < span class = "keywordflow" > case< / span > 0x42f7: < span class = "comment" > // EBMLReadVersion< / span > < / div >
< div class = "line" > < a name = "l01280" > < / a > < span class = "lineno" > 1280< / span >   < span class = "keywordflow" > case< / span > 0x42f2: < span class = "comment" > // EBMLMaxIdLength< / span > < / div >
< div class = "line" > < a name = "l01281" > < / a > < span class = "lineno" > 1281< / span >   < span class = "keywordflow" > case< / span > 0x42f3: < span class = "comment" > // EBMLMaxSizeLength< / span > < / div >
< div class = "line" > < a name = "l01282" > < / a > < span class = "lineno" > 1282< / span >   < span class = "keywordflow" > case< / span > 0x4287: < span class = "comment" > // DocTypeVersion< / span > < / div >
< div class = "line" > < a name = "l01283" > < / a > < span class = "lineno" > 1283< / span >   < span class = "keywordflow" > case< / span > 0x4285: < span class = "comment" > // DocTypeReadVersion< / span > < / div >
< div class = "line" > < a name = "l01284" > < / a > < span class = "lineno" > 1284< / span >   < span class = "keywordflow" > case< / span > 0xec: < span class = "comment" > // void< / span > < / div >
< div class = "line" > < a name = "l01285" > < / a > < span class = "lineno" > 1285< / span >   < span class = "keywordflow" > case< / span > 0xbf: < span class = "comment" > // CRC32< / span > < / div >
< div class = "line" > < a name = "l01286" > < / a > < span class = "lineno" > 1286< / span >   RCHECK(reader.SkipBits(tagsize * 8));< / div >
< div class = "line" > < a name = "l01287" > < / a > < span class = "lineno" > 1287< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01288" > < / a > < span class = "lineno" > 1288< / span >   < / div >
< div class = "line" > < a name = "l01289" > < / a > < span class = "lineno" > 1289< / span >   < span class = "keywordflow" > case< / span > 0x4282: < span class = "comment" > // EBMLDocType< / span > < / div >
< div class = "line" > < a name = "l01290" > < / a > < span class = "lineno" > 1290< / span >   < span class = "comment" > // Need to see " webm" or " matroska" next.< / span > < / div >
< div class = "line" > < a name = "l01291" > < / a > < span class = "lineno" > 1291< / span >   < span class = "keywordflow" > switch< / span > (ReadBits(& reader, 32)) {< / div >
< div class = "line" > < a name = "l01292" > < / a > < span class = "lineno" > 1292< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' w' < / span > , < span class = "charliteral" > ' e' < / span > , < span class = "charliteral" > ' b' < / span > , < span class = "charliteral" > ' m' < / span > ) :< / div >
< div class = "line" > < a name = "l01293" > < / a > < span class = "lineno" > 1293< / span >   return true;< / div >
< div class = "line" > < a name = "l01294" > < / a > < span class = "lineno" > 1294< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' m' < / span > , < span class = "charliteral" > ' a' < / span > , < span class = "charliteral" > ' t' < / span > , < span class = "charliteral" > ' r' < / span > ) :< / div >
< div class = "line" > < a name = "l01295" > < / a > < span class = "lineno" > 1295< / span >   return (ReadBits(& reader, 32) == TAG(< span class = "stringliteral" > ' o' < / span > , < span class = "stringliteral" > ' s' < / span > , < span class = "stringliteral" > ' k' < / span > , < span class = "stringliteral" > ' a' < / span > ));< / div >
< div class = "line" > < a name = "l01296" > < / a > < span class = "lineno" > 1296< / span >   }< / div >
< div class = "line" > < a name = "l01297" > < / a > < span class = "lineno" > 1297< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l01298" > < / a > < span class = "lineno" > 1298< / span >   < / div >
< div class = "line" > < a name = "l01299" > < / a > < span class = "lineno" > 1299< / span >   < span class = "keywordflow" > default< / span > : < span class = "comment" > // Unrecognized tag< / span > < / div >
< div class = "line" > < a name = "l01300" > < / a > < span class = "lineno" > 1300< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l01301" > < / a > < span class = "lineno" > 1301< / span >   }< / div >
< div class = "line" > < a name = "l01302" > < / a > < span class = "lineno" > 1302< / span >   }< / div >
< div class = "line" > < a name = "l01303" > < / a > < span class = "lineno" > 1303< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l01304" > < / a > < span class = "lineno" > 1304< / span >   }< / div >
< div class = "line" > < a name = "l01305" > < / a > < span class = "lineno" > 1305< / span >   < / div >
< div class = "line" > < a name = "l01306" > < / a > < span class = "lineno" > 1306< / span >   < span class = "keyword" > enum< / span > VC1StartCodes {< / div >
< div class = "line" > < a name = "l01307" > < / a > < span class = "lineno" > 1307< / span >   VC1_FRAME_START_CODE = 0x0d,< / div >
< div class = "line" > < a name = "l01308" > < / a > < span class = "lineno" > 1308< / span >   VC1_ENTRY_POINT_START_CODE = 0x0e,< / div >
< div class = "line" > < a name = "l01309" > < / a > < span class = "lineno" > 1309< / span >   VC1_SEQUENCE_START_CODE = 0x0f< / div >
< div class = "line" > < a name = "l01310" > < / a > < span class = "lineno" > 1310< / span >   };< / div >
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< div class = "line" > < a name = "l01311" > < / a > < span class = "lineno" > 1311< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01312" > < / a > < span class = "lineno" > 1312< / span >   < span class = "comment" > // Checks for a VC1 bitstream container.< / span > < / div >
< div class = "line" > < a name = "l01313" > < / a > < span class = "lineno" > 1313< / span >   < span class = "keyword" > static< / span > < span class = "keywordtype" > bool< / span > CheckVC1(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01314" > < / a > < span class = "lineno" > 1314< / span >   < span class = "comment" > // Reference: SMPTE 421M< / span > < / div >
< div class = "line" > < a name = "l01315" > < / a > < span class = "lineno" > 1315< / span >   < span class = "comment" > // (http://standards.smpte.org/content/978-1-61482-555-5/st-421-2006/SEC1.body.pdf)< / span > < / div >
< div class = "line" > < a name = "l01316" > < / a > < span class = "lineno" > 1316< / span >   < span class = "comment" > // However, no length ... simply scan for start code values.< / span > < / div >
< div class = "line" > < a name = "l01317" > < / a > < span class = "lineno" > 1317< / span >   < span class = "comment" > // Expect to see SEQ | [ [ ENTRY ] PIC* ]*< / span > < / div >
< div class = "line" > < a name = "l01318" > < / a > < span class = "lineno" > 1318< / span >   < span class = "comment" > // Note tags are very similar to H.264.< / span > < / div >
< div class = "line" > < a name = "l01319" > < / a > < span class = "lineno" > 1319< / span >   < / div >
< div class = "line" > < a name = "l01320" > < / a > < span class = "lineno" > 1320< / span >   RCHECK(buffer_size > = 24);< / div >
< div class = "line" > < a name = "l01321" > < / a > < span class = "lineno" > 1321< / span >   < / div >
< div class = "line" > < a name = "l01322" > < / a > < span class = "lineno" > 1322< / span >   < span class = "comment" > // First check for Bitstream Metadata Serialization (Annex L)< / span > < / div >
< div class = "line" > < a name = "l01323" > < / a > < span class = "lineno" > 1323< / span >   < span class = "keywordflow" > if< / span > (buffer[0] == 0xc5 & & < / div >
< div class = "line" > < a name = "l01324" > < / a > < span class = "lineno" > 1324< / span >   Read32(buffer + 4) == 0x04 & & < / div >
< div class = "line" > < a name = "l01325" > < / a > < span class = "lineno" > 1325< / span >   Read32(buffer + 20) == 0x0c) {< / div >
< div class = "line" > < a name = "l01326" > < / a > < span class = "lineno" > 1326< / span >   < span class = "comment" > // Verify settings in STRUCT_C and STRUCT_A< / span > < / div >
< div class = "line" > < a name = "l01327" > < / a > < span class = "lineno" > 1327< / span >   BitReader reader(buffer + 8, 12);< / div >
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< div class = "line" > < a name = "l01328" > < / a > < span class = "lineno" > 1328< / span >   < / div >
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< div class = "line" > < a name = "l01329" > < / a > < span class = "lineno" > 1329< / span >   < span class = "keywordtype" > int< / span > profile = ReadBits(& reader, 4);< / div >
< div class = "line" > < a name = "l01330" > < / a > < span class = "lineno" > 1330< / span >   < span class = "keywordflow" > if< / span > (profile == 0 || profile == 4) { < span class = "comment" > // simple or main< / span > < / div >
< div class = "line" > < a name = "l01331" > < / a > < span class = "lineno" > 1331< / span >   < span class = "comment" > // Skip FRMRTQ_POSTPROC, BITRTQ_POSTPROC, and LOOPFILTER.< / span > < / div >
< div class = "line" > < a name = "l01332" > < / a > < span class = "lineno" > 1332< / span >   reader.SkipBits(3 + 5 + 1);< / div >
< div class = "line" > < a name = "l01333" > < / a > < span class = "lineno" > 1333< / span >   < / div >
< div class = "line" > < a name = "l01334" > < / a > < span class = "lineno" > 1334< / span >   < span class = "comment" > // Next bit must be 0.< / span > < / div >
< div class = "line" > < a name = "l01335" > < / a > < span class = "lineno" > 1335< / span >   RCHECK(ReadBits(& reader, 1) == 0);< / div >
< div class = "line" > < a name = "l01336" > < / a > < span class = "lineno" > 1336< / span >   < / div >
< div class = "line" > < a name = "l01337" > < / a > < span class = "lineno" > 1337< / span >   < span class = "comment" > // Skip MULTIRES.< / span > < / div >
< div class = "line" > < a name = "l01338" > < / a > < span class = "lineno" > 1338< / span >   reader.SkipBits(1);< / div >
< div class = "line" > < a name = "l01339" > < / a > < span class = "lineno" > 1339< / span >   < / div >
< div class = "line" > < a name = "l01340" > < / a > < span class = "lineno" > 1340< / span >   < span class = "comment" > // Next bit must be 1.< / span > < / div >
< div class = "line" > < a name = "l01341" > < / a > < span class = "lineno" > 1341< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l01342" > < / a > < span class = "lineno" > 1342< / span >   < / div >
< div class = "line" > < a name = "l01343" > < / a > < span class = "lineno" > 1343< / span >   < span class = "comment" > // Skip FASTUVMC, EXTENDED_MV, DQUANT, and VSTRANSFORM.< / span > < / div >
< div class = "line" > < a name = "l01344" > < / a > < span class = "lineno" > 1344< / span >   reader.SkipBits(1 + 1 + 2 + 1);< / div >
< div class = "line" > < a name = "l01345" > < / a > < span class = "lineno" > 1345< / span >   < / div >
< div class = "line" > < a name = "l01346" > < / a > < span class = "lineno" > 1346< / span >   < span class = "comment" > // Next bit must be 0.< / span > < / div >
< div class = "line" > < a name = "l01347" > < / a > < span class = "lineno" > 1347< / span >   RCHECK(ReadBits(& reader, 1) == 0);< / div >
< div class = "line" > < a name = "l01348" > < / a > < span class = "lineno" > 1348< / span >   < / div >
< div class = "line" > < a name = "l01349" > < / a > < span class = "lineno" > 1349< / span >   < span class = "comment" > // Skip OVERLAP, SYNCMARKER, RANGERED, MAXBFRAMES, QUANTIZER, and< / span > < / div >
< div class = "line" > < a name = "l01350" > < / a > < span class = "lineno" > 1350< / span >   < span class = "comment" > // FINTERPFLAG.< / span > < / div >
< div class = "line" > < a name = "l01351" > < / a > < span class = "lineno" > 1351< / span >   reader.SkipBits(1 + 1 + 1 + 3 + 2 + 1);< / div >
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< div class = "line" > < a name = "l01352" > < / a > < span class = "lineno" > 1352< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01353" > < / a > < span class = "lineno" > 1353< / span >   < span class = "comment" > // Next bit must be 1.< / span > < / div >
< div class = "line" > < a name = "l01354" > < / a > < span class = "lineno" > 1354< / span >   RCHECK(ReadBits(& reader, 1) == 1);< / div >
< div class = "line" > < a name = "l01355" > < / a > < span class = "lineno" > 1355< / span >   < / div >
< div class = "line" > < a name = "l01356" > < / a > < span class = "lineno" > 1356< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l01357" > < / a > < span class = "lineno" > 1357< / span >   RCHECK(profile == 12); < span class = "comment" > // Other profile values not allowed.< / span > < / div >
< div class = "line" > < a name = "l01358" > < / a > < span class = "lineno" > 1358< / span >   RCHECK(ReadBits(& reader, 28) == 0);< / div >
< div class = "line" > < a name = "l01359" > < / a > < span class = "lineno" > 1359< / span >   }< / div >
< div class = "line" > < a name = "l01360" > < / a > < span class = "lineno" > 1360< / span >   < / div >
< div class = "line" > < a name = "l01361" > < / a > < span class = "lineno" > 1361< / span >   < span class = "comment" > // Now check HORIZ_SIZE and VERT_SIZE, which must be 8192 or less.< / span > < / div >
< div class = "line" > < a name = "l01362" > < / a > < span class = "lineno" > 1362< / span >   RCHECK(ReadBits(& reader, 32) < = 8192);< / div >
< div class = "line" > < a name = "l01363" > < / a > < span class = "lineno" > 1363< / span >   RCHECK(ReadBits(& reader, 32) < = 8192);< / div >
< div class = "line" > < a name = "l01364" > < / a > < span class = "lineno" > 1364< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l01365" > < / a > < span class = "lineno" > 1365< / span >   }< / div >
< div class = "line" > < a name = "l01366" > < / a > < span class = "lineno" > 1366< / span >   < / div >
< div class = "line" > < a name = "l01367" > < / a > < span class = "lineno" > 1367< / span >   < span class = "comment" > // Buffer isn' t Bitstream Metadata, so scan for start codes.< / span > < / div >
< div class = "line" > < a name = "l01368" > < / a > < span class = "lineno" > 1368< / span >   < span class = "keywordtype" > int< / span > offset = 0;< / div >
< div class = "line" > < a name = "l01369" > < / a > < span class = "lineno" > 1369< / span >   < span class = "keywordtype" > int< / span > sequence_start_code = 0;< / div >
< div class = "line" > < a name = "l01370" > < / a > < span class = "lineno" > 1370< / span >   < span class = "keywordtype" > int< / span > frame_start_code = 0;< / div >
< div class = "line" > < a name = "l01371" > < / a > < span class = "lineno" > 1371< / span >   < span class = "keywordflow" > while< / span > (< span class = "keyword" > true< / span > ) {< / div >
< div class = "line" > < a name = "l01372" > < / a > < span class = "lineno" > 1372< / span >   < span class = "comment" > // Advance to start_code, if there is one.< / span > < / div >
< div class = "line" > < a name = "l01373" > < / a > < span class = "lineno" > 1373< / span >   < span class = "keywordflow" > if< / span > (!AdvanceToStartCode(buffer, buffer_size, & offset, 5, 24, 1)) {< / div >
< div class = "line" > < a name = "l01374" > < / a > < span class = "lineno" > 1374< / span >   < span class = "comment" > // Not a complete sequence in memory, so return true if we' ve seen a< / span > < / div >
< div class = "line" > < a name = "l01375" > < / a > < span class = "lineno" > 1375< / span >   < span class = "comment" > // sequence start and a frame start (not checking entry points since< / span > < / div >
< div class = "line" > < a name = "l01376" > < / a > < span class = "lineno" > 1376< / span >   < span class = "comment" > // they only occur in advanced profiles).< / span > < / div >
< div class = "line" > < a name = "l01377" > < / a > < span class = "lineno" > 1377< / span >   < span class = "keywordflow" > return< / span > (sequence_start_code > 0 & & frame_start_code > 0);< / div >
< div class = "line" > < a name = "l01378" > < / a > < span class = "lineno" > 1378< / span >   }< / div >
< div class = "line" > < a name = "l01379" > < / a > < span class = "lineno" > 1379< / span >   < / div >
< div class = "line" > < a name = "l01380" > < / a > < span class = "lineno" > 1380< / span >   < span class = "comment" > // Now verify the block. AdvanceToStartCode() made sure that there are< / span > < / div >
< div class = "line" > < a name = "l01381" > < / a > < span class = "lineno" > 1381< / span >   < span class = "comment" > // at least 5 bytes remaining in the buffer.< / span > < / div >
< div class = "line" > < a name = "l01382" > < / a > < span class = "lineno" > 1382< / span >   BitReader reader(buffer + offset, 5);< / div >
< div class = "line" > < a name = "l01383" > < / a > < span class = "lineno" > 1383< / span >   RCHECK(ReadBits(& reader, 24) == 1);< / div >
< div class = "line" > < a name = "l01384" > < / a > < span class = "lineno" > 1384< / span >   < / div >
< div class = "line" > < a name = "l01385" > < / a > < span class = "lineno" > 1385< / span >   < span class = "comment" > // Keep track of the number of certain types received.< / span > < / div >
< div class = "line" > < a name = "l01386" > < / a > < span class = "lineno" > 1386< / span >   < span class = "keywordflow" > switch< / span > (ReadBits(& reader, 8)) {< / div >
< div class = "line" > < a name = "l01387" > < / a > < span class = "lineno" > 1387< / span >   < span class = "keywordflow" > case< / span > VC1_SEQUENCE_START_CODE: {< / div >
< div class = "line" > < a name = "l01388" > < / a > < span class = "lineno" > 1388< / span >   ++sequence_start_code;< / div >
< div class = "line" > < a name = "l01389" > < / a > < span class = "lineno" > 1389< / span >   < span class = "keywordflow" > switch< / span > (ReadBits(& reader, 2)) {< / div >
< div class = "line" > < a name = "l01390" > < / a > < span class = "lineno" > 1390< / span >   < span class = "keywordflow" > case< / span > 0: < span class = "comment" > // simple< / span > < / div >
< div class = "line" > < a name = "l01391" > < / a > < span class = "lineno" > 1391< / span >   < span class = "keywordflow" > case< / span > 1: < span class = "comment" > // main< / span > < / div >
< div class = "line" > < a name = "l01392" > < / a > < span class = "lineno" > 1392< / span >   RCHECK(ReadBits(& reader, 2) == 0);< / div >
< div class = "line" > < a name = "l01393" > < / a > < span class = "lineno" > 1393< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01394" > < / a > < span class = "lineno" > 1394< / span >   < span class = "keywordflow" > case< / span > 2: < span class = "comment" > // complex< / span > < / div >
< div class = "line" > < a name = "l01395" > < / a > < span class = "lineno" > 1395< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l01396" > < / a > < span class = "lineno" > 1396< / span >   < span class = "keywordflow" > case< / span > 3: < span class = "comment" > // advanced< / span > < / div >
< div class = "line" > < a name = "l01397" > < / a > < span class = "lineno" > 1397< / span >   RCHECK(ReadBits(& reader, 3) < = 4); < span class = "comment" > // Verify level = 0..4< / span > < / div >
< div class = "line" > < a name = "l01398" > < / a > < span class = "lineno" > 1398< / span >   RCHECK(ReadBits(& reader, 2) == 1); < span class = "comment" > // Verify colordiff_format = 1< / span > < / div >
< div class = "line" > < a name = "l01399" > < / a > < span class = "lineno" > 1399< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01400" > < / a > < span class = "lineno" > 1400< / span >   }< / div >
< div class = "line" > < a name = "l01401" > < / a > < span class = "lineno" > 1401< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01402" > < / a > < span class = "lineno" > 1402< / span >   }< / div >
< div class = "line" > < a name = "l01403" > < / a > < span class = "lineno" > 1403< / span >   < / div >
< div class = "line" > < a name = "l01404" > < / a > < span class = "lineno" > 1404< / span >   < span class = "keywordflow" > case< / span > VC1_ENTRY_POINT_START_CODE:< / div >
< div class = "line" > < a name = "l01405" > < / a > < span class = "lineno" > 1405< / span >   < span class = "comment" > // No fields in entry data to check. However, it must occur after< / span > < / div >
< div class = "line" > < a name = "l01406" > < / a > < span class = "lineno" > 1406< / span >   < span class = "comment" > // sequence header.< / span > < / div >
< div class = "line" > < a name = "l01407" > < / a > < span class = "lineno" > 1407< / span >   RCHECK(sequence_start_code > 0);< / div >
< div class = "line" > < a name = "l01408" > < / a > < span class = "lineno" > 1408< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01409" > < / a > < span class = "lineno" > 1409< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01410" > < / a > < span class = "lineno" > 1410< / span >   < span class = "keywordflow" > case< / span > VC1_FRAME_START_CODE:< / div >
< div class = "line" > < a name = "l01411" > < / a > < span class = "lineno" > 1411< / span >   ++frame_start_code;< / div >
< div class = "line" > < a name = "l01412" > < / a > < span class = "lineno" > 1412< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01413" > < / a > < span class = "lineno" > 1413< / span >   }< / div >
< div class = "line" > < a name = "l01414" > < / a > < span class = "lineno" > 1414< / span >   offset += 5;< / div >
< div class = "line" > < a name = "l01415" > < / a > < span class = "lineno" > 1415< / span >   }< / div >
< div class = "line" > < a name = "l01416" > < / a > < span class = "lineno" > 1416< / span >   }< / div >
< div class = "line" > < a name = "l01417" > < / a > < span class = "lineno" > 1417< / span >   < / div >
< div class = "line" > < a name = "l01418" > < / a > < span class = "lineno" > 1418< / span >   < span class = "comment" > // For some formats the signature is a bunch of characters. They are defined< / span > < / div >
< div class = "line" > < a name = "l01419" > < / a > < span class = "lineno" > 1419< / span >   < span class = "comment" > // below. Note that the first 4 characters of the string may be used as a TAG< / span > < / div >
< div class = "line" > < a name = "l01420" > < / a > < span class = "lineno" > 1420< / span >   < span class = "comment" > // in LookupContainerByFirst4. For signatures that contain embedded \0, use< / span > < / div >
< div class = "line" > < a name = "l01421" > < / a > < span class = "lineno" > 1421< / span >   < span class = "comment" > // uint8_t[].< / span > < / div >
< div class = "line" > < a name = "l01422" > < / a > < span class = "lineno" > 1422< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kAmrSignature[] = < span class = "stringliteral" > " #!AMR" < / span > ;< / div >
< div class = "line" > < a name = "l01423" > < / a > < span class = "lineno" > 1423< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > uint8_t kAsfSignature[] = {0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66,< / div >
< div class = "line" > < a name = "l01424" > < / a > < span class = "lineno" > 1424< / span >   0xcf, 0x11, 0xa6, 0xd9, 0x00, 0xaa,< / div >
< div class = "line" > < a name = "l01425" > < / a > < span class = "lineno" > 1425< / span >   0x00, 0x62, 0xce, 0x6c};< / div >
< div class = "line" > < a name = "l01426" > < / a > < span class = "lineno" > 1426< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kAssSignature[] = < span class = "stringliteral" > " [Script Info]" < / span > ;< / div >
< div class = "line" > < a name = "l01427" > < / a > < span class = "lineno" > 1427< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kAssBomSignature[] = UTF8_BYTE_ORDER_MARK < span class = "stringliteral" > " [Script Info]" < / span > ;< / div >
< div class = "line" > < a name = "l01428" > < / a > < span class = "lineno" > 1428< / span >   < span class = "keyword" > static< / span > < span class = "keyword" > const< / span > uint8_t kWtvSignature[] = {0xb7, 0xd8, 0x00, 0x20, 0x37, 0x49,< / div >
< div class = "line" > < a name = "l01429" > < / a > < span class = "lineno" > 1429< / span >   0xda, 0x11, 0xa6, 0x4e, 0x00, 0x07,< / div >
< div class = "line" > < a name = "l01430" > < / a > < span class = "lineno" > 1430< / span >   0xe9, 0x5e, 0xad, 0x8d};< / div >
< div class = "line" > < a name = "l01431" > < / a > < span class = "lineno" > 1431< / span >   < / div >
< div class = "line" > < a name = "l01432" > < / a > < span class = "lineno" > 1432< / span >   < span class = "comment" > // Attempt to determine the container type from the buffer provided. This is< / span > < / div >
< div class = "line" > < a name = "l01433" > < / a > < span class = "lineno" > 1433< / span >   < span class = "comment" > // a simple pass, that uses the first 4 bytes of the buffer as an index to get< / span > < / div >
< div class = "line" > < a name = "l01434" > < / a > < span class = "lineno" > 1434< / span >   < span class = "comment" > // a rough idea of the container format.< / span > < / div >
< div class = "line" > < a name = "l01435" > < / a > < span class = "lineno" > 1435< / span >   < span class = "keyword" > static< / span > MediaContainerName LookupContainerByFirst4(< span class = "keyword" > const< / span > uint8_t* buffer,< / div >
< div class = "line" > < a name = "l01436" > < / a > < span class = "lineno" > 1436< / span >   < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01437" > < / a > < span class = "lineno" > 1437< / span >   < span class = "comment" > // Minimum size that the code expects to exist without checking size.< / span > < / div >
< div class = "line" > < a name = "l01438" > < / a > < span class = "lineno" > 1438< / span >   < span class = "keywordflow" > if< / span > (buffer_size < 12)< / div >
< div class = "line" > < a name = "l01439" > < / a > < span class = "lineno" > 1439< / span >   < span class = "keywordflow" > return< / span > CONTAINER_UNKNOWN;< / div >
< div class = "line" > < a name = "l01440" > < / a > < span class = "lineno" > 1440< / span >   < / div >
< div class = "line" > < a name = "l01441" > < / a > < span class = "lineno" > 1441< / span >   uint32_t first4 = Read32(buffer);< / div >
< div class = "line" > < a name = "l01442" > < / a > < span class = "lineno" > 1442< / span >   < span class = "keywordflow" > switch< / span > (first4) {< / div >
< div class = "line" > < a name = "l01443" > < / a > < span class = "lineno" > 1443< / span >   < span class = "keywordflow" > case< / span > 0x1a45dfa3:< / div >
< div class = "line" > < a name = "l01444" > < / a > < span class = "lineno" > 1444< / span >   < span class = "keywordflow" > if< / span > (CheckWebm(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01445" > < / a > < span class = "lineno" > 1445< / span >   < span class = "keywordflow" > return< / span > CONTAINER_WEBM;< / div >
< div class = "line" > < a name = "l01446" > < / a > < span class = "lineno" > 1446< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01447" > < / a > < span class = "lineno" > 1447< / span >   < / div >
< div class = "line" > < a name = "l01448" > < / a > < span class = "lineno" > 1448< / span >   < span class = "keywordflow" > case< / span > 0x3026b275:< / div >
< div class = "line" > < a name = "l01449" > < / a > < span class = "lineno" > 1449< / span >   < span class = "keywordflow" > if< / span > (StartsWith(buffer,< / div >
< div class = "line" > < a name = "l01450" > < / a > < span class = "lineno" > 1450< / span >   buffer_size,< / div >
< div class = "line" > < a name = "l01451" > < / a > < span class = "lineno" > 1451< / span >   kAsfSignature,< / div >
< div class = "line" > < a name = "l01452" > < / a > < span class = "lineno" > 1452< / span >   < span class = "keyword" > sizeof< / span > (kAsfSignature))) {< / div >
< div class = "line" > < a name = "l01453" > < / a > < span class = "lineno" > 1453< / span >   < span class = "keywordflow" > return< / span > CONTAINER_ASF;< / div >
< div class = "line" > < a name = "l01454" > < / a > < span class = "lineno" > 1454< / span >   }< / div >
< div class = "line" > < a name = "l01455" > < / a > < span class = "lineno" > 1455< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01456" > < / a > < span class = "lineno" > 1456< / span >   < / div >
< div class = "line" > < a name = "l01457" > < / a > < span class = "lineno" > 1457< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' #' < / span > ,< span class = "charliteral" > ' !' < / span > ,< span class = "charliteral" > ' A' < / span > ,< span class = "charliteral" > ' M' < / span > ):< / div >
< div class = "line" > < a name = "l01458" > < / a > < span class = "lineno" > 1458< / span >   if (StartsWith(buffer, buffer_size, kAmrSignature))< / div >
< div class = "line" > < a name = "l01459" > < / a > < span class = "lineno" > 1459< / span >   return CONTAINER_AMR;< / div >
< div class = "line" > < a name = "l01460" > < / a > < span class = "lineno" > 1460< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01461" > < / a > < span class = "lineno" > 1461< / span >   < / div >
< div class = "line" > < a name = "l01462" > < / a > < span class = "lineno" > 1462< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' #' < / span > ,< span class = "charliteral" > ' E' < / span > ,< span class = "charliteral" > ' X' < / span > ,< span class = "charliteral" > ' T' < / span > ):< / div >
< div class = "line" > < a name = "l01463" > < / a > < span class = "lineno" > 1463< / span >   if (CheckHls(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01464" > < / a > < span class = "lineno" > 1464< / span >   return CONTAINER_HLS;< / div >
< div class = "line" > < a name = "l01465" > < / a > < span class = "lineno" > 1465< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01466" > < / a > < span class = "lineno" > 1466< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01467" > < / a > < span class = "lineno" > 1467< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' .' < / span > ,< span class = "charliteral" > ' R' < / span > ,< span class = "charliteral" > ' M' < / span > ,< span class = "charliteral" > ' F' < / span > ):< / div >
< div class = "line" > < a name = "l01468" > < / a > < span class = "lineno" > 1468< / span >   if (buffer[4] == 0 & & buffer[5] == 0)< / div >
< div class = "line" > < a name = "l01469" > < / a > < span class = "lineno" > 1469< / span >   return CONTAINER_RM;< / div >
< div class = "line" > < a name = "l01470" > < / a > < span class = "lineno" > 1470< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01471" > < / a > < span class = "lineno" > 1471< / span >   < / div >
< div class = "line" > < a name = "l01472" > < / a > < span class = "lineno" > 1472< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' .' < / span > ,< span class = "charliteral" > ' r' < / span > ,< span class = "charliteral" > ' a' < / span > ,< span class = "stringliteral" > ' \xfd' < / span > ):< / div >
< div class = "line" > < a name = "l01473" > < / a > < span class = "lineno" > 1473< / span >   return CONTAINER_RM;< / div >
< div class = "line" > < a name = "l01474" > < / a > < span class = "lineno" > 1474< / span >   < / div >
< div class = "line" > < a name = "l01475" > < / a > < span class = "lineno" > 1475< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' B' < / span > ,< span class = "charliteral" > ' I' < / span > ,< span class = "charliteral" > ' K' < / span > ,< span class = "charliteral" > ' b' < / span > ):< / div >
< div class = "line" > < a name = "l01476" > < / a > < span class = "lineno" > 1476< / span >   case TAG(< span class = "stringliteral" > ' B' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' K' < / span > ,< span class = "stringliteral" > ' d' < / span > ):< / div >
< div class = "line" > < a name = "l01477" > < / a > < span class = "lineno" > 1477< / span >   case TAG(< span class = "stringliteral" > ' B' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' K' < / span > ,< span class = "stringliteral" > ' f' < / span > ):< / div >
< div class = "line" > < a name = "l01478" > < / a > < span class = "lineno" > 1478< / span >   case TAG(< span class = "stringliteral" > ' B' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' K' < / span > ,< span class = "stringliteral" > ' g' < / span > ):< / div >
< div class = "line" > < a name = "l01479" > < / a > < span class = "lineno" > 1479< / span >   case TAG(< span class = "stringliteral" > ' B' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' K' < / span > ,< span class = "stringliteral" > ' h' < / span > ):< / div >
< div class = "line" > < a name = "l01480" > < / a > < span class = "lineno" > 1480< / span >   case TAG(< span class = "stringliteral" > ' B' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' K' < / span > ,< span class = "stringliteral" > ' i' < / span > ):< / div >
< div class = "line" > < a name = "l01481" > < / a > < span class = "lineno" > 1481< / span >   if (CheckBink(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01482" > < / a > < span class = "lineno" > 1482< / span >   return CONTAINER_BINK;< / div >
< div class = "line" > < a name = "l01483" > < / a > < span class = "lineno" > 1483< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01484" > < / a > < span class = "lineno" > 1484< / span >   < / div >
< div class = "line" > < a name = "l01485" > < / a > < span class = "lineno" > 1485< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' c' < / span > ,< span class = "charliteral" > ' a' < / span > ,< span class = "charliteral" > ' f' < / span > ,< span class = "charliteral" > ' f' < / span > ):< / div >
< div class = "line" > < a name = "l01486" > < / a > < span class = "lineno" > 1486< / span >   if (CheckCaf(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01487" > < / a > < span class = "lineno" > 1487< / span >   return CONTAINER_CAF;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01488" > < / a > < span class = "lineno" > 1488< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01489" > < / a > < span class = "lineno" > 1489< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01490" > < / a > < span class = "lineno" > 1490< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' D' < / span > ,< span class = "charliteral" > ' E' < / span > ,< span class = "charliteral" > ' X' < / span > ,< span class = "charliteral" > ' A' < / span > ):< / div >
< div class = "line" > < a name = "l01491" > < / a > < span class = "lineno" > 1491< / span >   if (buffer_size > 15 & & < / div >
< div class = "line" > < a name = "l01492" > < / a > < span class = "lineno" > 1492< / span >   Read16(buffer + 11) < = 2048 & & < / div >
< div class = "line" > < a name = "l01493" > < / a > < span class = "lineno" > 1493< / span >   Read16(buffer + 13) < = 2048) {< / div >
< div class = "line" > < a name = "l01494" > < / a > < span class = "lineno" > 1494< / span >   < span class = "keywordflow" > return< / span > CONTAINER_DXA;< / div >
< div class = "line" > < a name = "l01495" > < / a > < span class = "lineno" > 1495< / span >   }< / div >
< div class = "line" > < a name = "l01496" > < / a > < span class = "lineno" > 1496< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01497" > < / a > < span class = "lineno" > 1497< / span >   < / div >
< div class = "line" > < a name = "l01498" > < / a > < span class = "lineno" > 1498< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' D' < / span > ,< span class = "charliteral" > ' T' < / span > ,< span class = "charliteral" > ' S' < / span > ,< span class = "charliteral" > ' H' < / span > ):< / div >
< div class = "line" > < a name = "l01499" > < / a > < span class = "lineno" > 1499< / span >   if (Read32(buffer + 4) == TAG(< span class = "stringliteral" > ' D' < / span > ,< span class = "stringliteral" > ' H' < / span > ,< span class = "stringliteral" > ' D' < / span > ,< span class = "stringliteral" > ' R' < / span > ))< / div >
< div class = "line" > < a name = "l01500" > < / a > < span class = "lineno" > 1500< / span >   return CONTAINER_DTSHD;< / div >
< div class = "line" > < a name = "l01501" > < / a > < span class = "lineno" > 1501< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01502" > < / a > < span class = "lineno" > 1502< / span >   < / div >
< div class = "line" > < a name = "l01503" > < / a > < span class = "lineno" > 1503< / span >   < span class = "keywordflow" > case< / span > 0x64a30100:< / div >
< div class = "line" > < a name = "l01504" > < / a > < span class = "lineno" > 1504< / span >   < span class = "keywordflow" > case< / span > 0x64a30200:< / div >
< div class = "line" > < a name = "l01505" > < / a > < span class = "lineno" > 1505< / span >   < span class = "keywordflow" > case< / span > 0x64a30300:< / div >
< div class = "line" > < a name = "l01506" > < / a > < span class = "lineno" > 1506< / span >   < span class = "keywordflow" > case< / span > 0x64a30400:< / div >
< div class = "line" > < a name = "l01507" > < / a > < span class = "lineno" > 1507< / span >   < span class = "keywordflow" > case< / span > 0x0001a364:< / div >
< div class = "line" > < a name = "l01508" > < / a > < span class = "lineno" > 1508< / span >   < span class = "keywordflow" > case< / span > 0x0002a364:< / div >
< div class = "line" > < a name = "l01509" > < / a > < span class = "lineno" > 1509< / span >   < span class = "keywordflow" > case< / span > 0x0003a364:< / div >
< div class = "line" > < a name = "l01510" > < / a > < span class = "lineno" > 1510< / span >   < span class = "keywordflow" > if< / span > (Read32(buffer + 4) != 0 & & Read32(buffer + 8) != 0)< / div >
< div class = "line" > < a name = "l01511" > < / a > < span class = "lineno" > 1511< / span >   < span class = "keywordflow" > return< / span > CONTAINER_IRCAM;< / div >
< div class = "line" > < a name = "l01512" > < / a > < span class = "lineno" > 1512< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01513" > < / a > < span class = "lineno" > 1513< / span >   < / div >
< div class = "line" > < a name = "l01514" > < / a > < span class = "lineno" > 1514< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' f' < / span > ,< span class = "charliteral" > ' L' < / span > ,< span class = "charliteral" > ' a' < / span > ,< span class = "charliteral" > ' C' < / span > ):< / div >
< div class = "line" > < a name = "l01515" > < / a > < span class = "lineno" > 1515< / span >   return CONTAINER_FLAC;< / div >
< div class = "line" > < a name = "l01516" > < / a > < span class = "lineno" > 1516< / span >   < / div >
< div class = "line" > < a name = "l01517" > < / a > < span class = "lineno" > 1517< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' F' < / span > ,< span class = "charliteral" > ' L' < / span > ,< span class = "charliteral" > ' V' < / span > ,0):< / div >
< div class = "line" > < a name = "l01518" > < / a > < span class = "lineno" > 1518< / span >   case TAG(< span class = "stringliteral" > ' F' < / span > ,< span class = "stringliteral" > ' L' < / span > ,< span class = "stringliteral" > ' V' < / span > ,1):< / div >
< div class = "line" > < a name = "l01519" > < / a > < span class = "lineno" > 1519< / span >   case TAG(< span class = "stringliteral" > ' F' < / span > ,< span class = "stringliteral" > ' L' < / span > ,< span class = "stringliteral" > ' V' < / span > ,2):< / div >
< div class = "line" > < a name = "l01520" > < / a > < span class = "lineno" > 1520< / span >   case TAG(< span class = "stringliteral" > ' F' < / span > ,< span class = "stringliteral" > ' L' < / span > ,< span class = "stringliteral" > ' V' < / span > ,3):< / div >
< div class = "line" > < a name = "l01521" > < / a > < span class = "lineno" > 1521< / span >   case TAG(< span class = "stringliteral" > ' F' < / span > ,< span class = "stringliteral" > ' L' < / span > ,< span class = "stringliteral" > ' V' < / span > ,4):< / div >
< div class = "line" > < a name = "l01522" > < / a > < span class = "lineno" > 1522< / span >   if (buffer[5] == 0 & & Read32(buffer + 5) > 8)< / div >
< div class = "line" > < a name = "l01523" > < / a > < span class = "lineno" > 1523< / span >   return CONTAINER_FLV;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01524" > < / a > < span class = "lineno" > 1524< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01525" > < / a > < span class = "lineno" > 1525< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01526" > < / a > < span class = "lineno" > 1526< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' F' < / span > ,< span class = "charliteral" > ' O' < / span > ,< span class = "charliteral" > ' R' < / span > ,< span class = "charliteral" > ' M' < / span > ):< / div >
< div class = "line" > < a name = "l01527" > < / a > < span class = "lineno" > 1527< / span >   switch (Read32(buffer + 8)) {< / div >
< div class = "line" > < a name = "l01528" > < / a > < span class = "lineno" > 1528< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' A' < / span > ,< span class = "charliteral" > ' I' < / span > ,< span class = "charliteral" > ' F' < / span > ,< span class = "charliteral" > ' F' < / span > ):< / div >
< div class = "line" > < a name = "l01529" > < / a > < span class = "lineno" > 1529< / span >   case TAG(< span class = "stringliteral" > ' A' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' F' < / span > ,< span class = "stringliteral" > ' C' < / span > ):< / div >
< div class = "line" > < a name = "l01530" > < / a > < span class = "lineno" > 1530< / span >   return CONTAINER_AIFF;< / div >
< div class = "line" > < a name = "l01531" > < / a > < span class = "lineno" > 1531< / span >   }< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01532" > < / a > < span class = "lineno" > 1532< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01533" > < / a > < span class = "lineno" > 1533< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01534" > < / a > < span class = "lineno" > 1534< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' M' < / span > ,< span class = "charliteral" > ' A' < / span > ,< span class = "charliteral" > ' C' < / span > ,< span class = "charliteral" > ' ' < / span > ):< / div >
< div class = "line" > < a name = "l01535" > < / a > < span class = "lineno" > 1535< / span >   return CONTAINER_APE;< / div >
< div class = "line" > < a name = "l01536" > < / a > < span class = "lineno" > 1536< / span >   < / div >
< div class = "line" > < a name = "l01537" > < / a > < span class = "lineno" > 1537< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' O' < / span > ,< span class = "charliteral" > ' N' < / span > ,< span class = "charliteral" > ' 2' < / span > ,< span class = "charliteral" > ' ' < / span > ):< / div >
< div class = "line" > < a name = "l01538" > < / a > < span class = "lineno" > 1538< / span >   if (Read32(buffer + 8) == TAG(< span class = "stringliteral" > ' O' < / span > ,< span class = "stringliteral" > ' N' < / span > ,< span class = "stringliteral" > ' 2' < / span > ,< span class = "stringliteral" > ' f' < / span > ))< / div >
< div class = "line" > < a name = "l01539" > < / a > < span class = "lineno" > 1539< / span >   return CONTAINER_AVI;< / div >
< div class = "line" > < a name = "l01540" > < / a > < span class = "lineno" > 1540< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01541" > < / a > < span class = "lineno" > 1541< / span >   < / div >
< div class = "line" > < a name = "l01542" > < / a > < span class = "lineno" > 1542< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' O' < / span > ,< span class = "charliteral" > ' g' < / span > ,< span class = "charliteral" > ' g' < / span > ,< span class = "charliteral" > ' S' < / span > ):< / div >
< div class = "line" > < a name = "l01543" > < / a > < span class = "lineno" > 1543< / span >   if (buffer[5] < = 7)< / div >
< div class = "line" > < a name = "l01544" > < / a > < span class = "lineno" > 1544< / span >   return CONTAINER_OGG;< / div >
< div class = "line" > < a name = "l01545" > < / a > < span class = "lineno" > 1545< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01546" > < / a > < span class = "lineno" > 1546< / span >   < / div >
< div class = "line" > < a name = "l01547" > < / a > < span class = "lineno" > 1547< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' R' < / span > ,< span class = "charliteral" > ' F' < / span > ,< span class = "charliteral" > ' 6' < / span > ,< span class = "charliteral" > ' 4' < / span > ):< / div >
< div class = "line" > < a name = "l01548" > < / a > < span class = "lineno" > 1548< / span >   if (buffer_size > 16 & & Read32(buffer + 12) == TAG(< span class = "stringliteral" > ' d' < / span > ,< span class = "stringliteral" > ' s' < / span > ,< span class = "stringliteral" > ' 6' < / span > ,< span class = "stringliteral" > ' 4' < / span > ))< / div >
< div class = "line" > < a name = "l01549" > < / a > < span class = "lineno" > 1549< / span >   return CONTAINER_WAV;< / div >
< div class = "line" > < a name = "l01550" > < / a > < span class = "lineno" > 1550< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01551" > < / a > < span class = "lineno" > 1551< / span >   < / div >
< div class = "line" > < a name = "l01552" > < / a > < span class = "lineno" > 1552< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' R' < / span > ,< span class = "charliteral" > ' I' < / span > ,< span class = "charliteral" > ' F' < / span > ,< span class = "charliteral" > ' F' < / span > ):< / div >
< div class = "line" > < a name = "l01553" > < / a > < span class = "lineno" > 1553< / span >   switch (Read32(buffer + 8)) {< / div >
< div class = "line" > < a name = "l01554" > < / a > < span class = "lineno" > 1554< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' A' < / span > ,< span class = "charliteral" > ' V' < / span > ,< span class = "charliteral" > ' I' < / span > ,< span class = "charliteral" > ' ' < / span > ):< / div >
< div class = "line" > < a name = "l01555" > < / a > < span class = "lineno" > 1555< / span >   case TAG(< span class = "stringliteral" > ' A' < / span > ,< span class = "stringliteral" > ' V' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' X' < / span > ):< / div >
< div class = "line" > < a name = "l01556" > < / a > < span class = "lineno" > 1556< / span >   case TAG(< span class = "stringliteral" > ' A' < / span > ,< span class = "stringliteral" > ' V' < / span > ,< span class = "stringliteral" > ' I' < / span > ,< span class = "stringliteral" > ' \x19' < / span > ):< / div >
< div class = "line" > < a name = "l01557" > < / a > < span class = "lineno" > 1557< / span >   case TAG(< span class = "stringliteral" > ' A' < / span > ,< span class = "stringliteral" > ' M' < / span > ,< span class = "stringliteral" > ' V' < / span > ,< span class = "stringliteral" > ' ' < / span > ):< / div >
< div class = "line" > < a name = "l01558" > < / a > < span class = "lineno" > 1558< / span >   return CONTAINER_AVI;< / div >
< div class = "line" > < a name = "l01559" > < / a > < span class = "lineno" > 1559< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' W' < / span > ,< span class = "charliteral" > ' A' < / span > ,< span class = "charliteral" > ' V' < / span > ,< span class = "charliteral" > ' E' < / span > ):< / div >
< div class = "line" > < a name = "l01560" > < / a > < span class = "lineno" > 1560< / span >   return CONTAINER_WAV;< / div >
< div class = "line" > < a name = "l01561" > < / a > < span class = "lineno" > 1561< / span >   }< / div >
< div class = "line" > < a name = "l01562" > < / a > < span class = "lineno" > 1562< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01563" > < / a > < span class = "lineno" > 1563< / span >   < / div >
< div class = "line" > < a name = "l01564" > < / a > < span class = "lineno" > 1564< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' [' < / span > ,< span class = "charliteral" > ' S' < / span > ,< span class = "charliteral" > ' c' < / span > ,< span class = "charliteral" > ' r' < / span > ):< / div >
< div class = "line" > < a name = "l01565" > < / a > < span class = "lineno" > 1565< / span >   if (StartsWith(buffer, buffer_size, kAssSignature))< / div >
< div class = "line" > < a name = "l01566" > < / a > < span class = "lineno" > 1566< / span >   return CONTAINER_ASS;< / div >
< div class = "line" > < a name = "l01567" > < / a > < span class = "lineno" > 1567< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01568" > < / a > < span class = "lineno" > 1568< / span >   < / div >
< div class = "line" > < a name = "l01569" > < / a > < span class = "lineno" > 1569< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "stringliteral" > ' \xef' < / span > ,< span class = "stringliteral" > ' \xbb' < / span > ,< span class = "stringliteral" > ' \xbf' < / span > ,< span class = "charliteral" > ' [' < / span > ):< / div >
< div class = "line" > < a name = "l01570" > < / a > < span class = "lineno" > 1570< / span >   if (StartsWith(buffer, buffer_size, kAssBomSignature))< / div >
< div class = "line" > < a name = "l01571" > < / a > < span class = "lineno" > 1571< / span >   return CONTAINER_ASS;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01572" > < / a > < span class = "lineno" > 1572< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01573" > < / a > < span class = "lineno" > 1573< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01574" > < / a > < span class = "lineno" > 1574< / span >   < span class = "keywordflow" > case< / span > 0x7ffe8001:< / div >
< div class = "line" > < a name = "l01575" > < / a > < span class = "lineno" > 1575< / span >   < span class = "keywordflow" > case< / span > 0xfe7f0180:< / div >
< div class = "line" > < a name = "l01576" > < / a > < span class = "lineno" > 1576< / span >   < span class = "keywordflow" > case< / span > 0x1fffe800:< / div >
< div class = "line" > < a name = "l01577" > < / a > < span class = "lineno" > 1577< / span >   < span class = "keywordflow" > case< / span > 0xff1f00e8:< / div >
< div class = "line" > < a name = "l01578" > < / a > < span class = "lineno" > 1578< / span >   < span class = "keywordflow" > if< / span > (CheckDts(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01579" > < / a > < span class = "lineno" > 1579< / span >   < span class = "keywordflow" > return< / span > CONTAINER_DTS;< / div >
< div class = "line" > < a name = "l01580" > < / a > < span class = "lineno" > 1580< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01581" > < / a > < span class = "lineno" > 1581< / span >   < / div >
< div class = "line" > < a name = "l01582" > < / a > < span class = "lineno" > 1582< / span >   < span class = "keywordflow" > case< / span > 0xb7d80020:< / div >
< div class = "line" > < a name = "l01583" > < / a > < span class = "lineno" > 1583< / span >   < span class = "keywordflow" > if< / span > (StartsWith(buffer,< / div >
< div class = "line" > < a name = "l01584" > < / a > < span class = "lineno" > 1584< / span >   buffer_size,< / div >
< div class = "line" > < a name = "l01585" > < / a > < span class = "lineno" > 1585< / span >   kWtvSignature,< / div >
< div class = "line" > < a name = "l01586" > < / a > < span class = "lineno" > 1586< / span >   < span class = "keyword" > sizeof< / span > (kWtvSignature))) {< / div >
< div class = "line" > < a name = "l01587" > < / a > < span class = "lineno" > 1587< / span >   < span class = "keywordflow" > return< / span > CONTAINER_WTV;< / div >
< div class = "line" > < a name = "l01588" > < / a > < span class = "lineno" > 1588< / span >   }< / div >
< div class = "line" > < a name = "l01589" > < / a > < span class = "lineno" > 1589< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01590" > < / a > < span class = "lineno" > 1590< / span >   < span class = "keywordflow" > case< / span > 0x000001ba:< / div >
< div class = "line" > < a name = "l01591" > < / a > < span class = "lineno" > 1591< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MPEG2PS;< / div >
< div class = "line" > < a name = "l01592" > < / a > < span class = "lineno" > 1592< / span >   }< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01593" > < / a > < span class = "lineno" > 1593< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01594" > < / a > < span class = "lineno" > 1594< / span >   < span class = "comment" > // Now try a few different ones that look at something other< / span > < / div >
< div class = "line" > < a name = "l01595" > < / a > < span class = "lineno" > 1595< / span >   < span class = "comment" > // than the first 4 bytes.< / span > < / div >
< div class = "line" > < a name = "l01596" > < / a > < span class = "lineno" > 1596< / span >   uint32_t first3 = first4 & 0xffffff00;< / div >
< div class = "line" > < a name = "l01597" > < / a > < span class = "lineno" > 1597< / span >   < span class = "keywordflow" > switch< / span > (first3) {< / div >
< div class = "line" > < a name = "l01598" > < / a > < span class = "lineno" > 1598< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' C' < / span > ,< span class = "charliteral" > ' W' < / span > ,< span class = "charliteral" > ' S' < / span > ,0):< / div >
< div class = "line" > < a name = "l01599" > < / a > < span class = "lineno" > 1599< / span >   case TAG(< span class = "stringliteral" > ' F' < / span > ,< span class = "stringliteral" > ' W' < / span > ,< span class = "stringliteral" > ' S' < / span > ,0):< / div >
< div class = "line" > < a name = "l01600" > < / a > < span class = "lineno" > 1600< / span >   return CONTAINER_SWF;< / div >
< div class = "line" > < a name = "l01601" > < / a > < span class = "lineno" > 1601< / span >   < / div >
< div class = "line" > < a name = "l01602" > < / a > < span class = "lineno" > 1602< / span >   < span class = "keywordflow" > case< / span > TAG(< span class = "charliteral" > ' I' < / span > ,< span class = "charliteral" > ' D' < / span > ,< span class = "charliteral" > ' 3' < / span > ,0):< / div >
< div class = "line" > < a name = "l01603" > < / a > < span class = "lineno" > 1603< / span >   if (CheckMp3(buffer, buffer_size, true))< / div >
< div class = "line" > < a name = "l01604" > < / a > < span class = "lineno" > 1604< / span >   return CONTAINER_MP3;< / div >
< div class = "line" > < a name = "l01605" > < / a > < span class = "lineno" > 1605< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01606" > < / a > < span class = "lineno" > 1606< / span >   }< / div >
< div class = "line" > < a name = "l01607" > < / a > < span class = "lineno" > 1607< / span >   < / div >
< div class = "line" > < a name = "l01608" > < / a > < span class = "lineno" > 1608< / span >   < span class = "comment" > // Maybe the first 2 characters are something we can use.< / span > < / div >
< div class = "line" > < a name = "l01609" > < / a > < span class = "lineno" > 1609< / span >   uint32_t first2 = Read16(buffer);< / div >
< div class = "line" > < a name = "l01610" > < / a > < span class = "lineno" > 1610< / span >   < span class = "keywordflow" > switch< / span > (first2) {< / div >
< div class = "line" > < a name = "l01611" > < / a > < span class = "lineno" > 1611< / span >   < span class = "keywordflow" > case< / span > kAc3SyncWord:< / div >
< div class = "line" > < a name = "l01612" > < / a > < span class = "lineno" > 1612< / span >   < span class = "keywordflow" > if< / span > (CheckAc3(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01613" > < / a > < span class = "lineno" > 1613< / span >   < span class = "keywordflow" > return< / span > CONTAINER_AC3;< / div >
< div class = "line" > < a name = "l01614" > < / a > < span class = "lineno" > 1614< / span >   < span class = "keywordflow" > if< / span > (CheckEac3(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01615" > < / a > < span class = "lineno" > 1615< / span >   < span class = "keywordflow" > return< / span > CONTAINER_EAC3;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01616" > < / a > < span class = "lineno" > 1616< / span >   < span class = "keywordflow" > break< / span > ;< / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01617" > < / a > < span class = "lineno" > 1617< / span >   < / div >
< div class = "line" > < a name = "l01618" > < / a > < span class = "lineno" > 1618< / span >   < span class = "keywordflow" > case< / span > 0xfff0:< / div >
< div class = "line" > < a name = "l01619" > < / a > < span class = "lineno" > 1619< / span >   < span class = "keywordflow" > case< / span > 0xfff1:< / div >
< div class = "line" > < a name = "l01620" > < / a > < span class = "lineno" > 1620< / span >   < span class = "keywordflow" > case< / span > 0xfff8:< / div >
< div class = "line" > < a name = "l01621" > < / a > < span class = "lineno" > 1621< / span >   < span class = "keywordflow" > case< / span > 0xfff9:< / div >
< div class = "line" > < a name = "l01622" > < / a > < span class = "lineno" > 1622< / span >   < span class = "keywordflow" > if< / span > (CheckAac(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01623" > < / a > < span class = "lineno" > 1623< / span >   < span class = "keywordflow" > return< / span > CONTAINER_AAC;< / div >
< div class = "line" > < a name = "l01624" > < / a > < span class = "lineno" > 1624< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l01625" > < / a > < span class = "lineno" > 1625< / span >   }< / div >
< div class = "line" > < a name = "l01626" > < / a > < span class = "lineno" > 1626< / span >   < / div >
< div class = "line" > < a name = "l01627" > < / a > < span class = "lineno" > 1627< / span >   < span class = "comment" > // Check if the file is in MP3 format without the header.< / span > < / div >
< div class = "line" > < a name = "l01628" > < / a > < span class = "lineno" > 1628< / span >   < span class = "keywordflow" > if< / span > (CheckMp3(buffer, buffer_size, < span class = "keyword" > false< / span > ))< / div >
< div class = "line" > < a name = "l01629" > < / a > < span class = "lineno" > 1629< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MP3;< / div >
< div class = "line" > < a name = "l01630" > < / a > < span class = "lineno" > 1630< / span >   < / div >
< div class = "line" > < a name = "l01631" > < / a > < span class = "lineno" > 1631< / span >   < span class = "keywordflow" > return< / span > CONTAINER_UNKNOWN;< / div >
< div class = "line" > < a name = "l01632" > < / a > < span class = "lineno" > 1632< / span >   }< / div >
< div class = "line" > < a name = "l01633" > < / a > < span class = "lineno" > 1633< / span >   < / div >
< div class = "line" > < a name = "l01634" > < / a > < span class = "lineno" > 1634< / span >   < span class = "keyword" > namespace < / span > {< / div >
< div class = "line" > < a name = "l01635" > < / a > < span class = "lineno" > 1635< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > kWebVtt[] = < span class = "stringliteral" > " WEBVTT" < / span > ;< / div >
< div class = "line" > < a name = "l01636" > < / a > < span class = "lineno" > 1636< / span >   < / div >
< div class = "line" > < a name = "l01637" > < / a > < span class = "lineno" > 1637< / span >   < span class = "keywordtype" > bool< / span > CheckWebVtt(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01638" > < / a > < span class = "lineno" > 1638< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > offset =< / div >
< div class = "line" > < a name = "l01639" > < / a > < span class = "lineno" > 1639< / span >   StartsWith(buffer, buffer_size, UTF8_BYTE_ORDER_MARK) ? 3 : 0;< / div >
< div class = "line" > < a name = "l01640" > < / a > < span class = "lineno" > 1640< / span >   < / div >
< div class = "line" > < a name = "l01641" > < / a > < span class = "lineno" > 1641< / span >   < span class = "keywordflow" > return< / span > StartsWith(buffer + offset, buffer_size - offset,< / div >
< div class = "line" > < a name = "l01642" > < / a > < span class = "lineno" > 1642< / span >   reinterpret_cast< const uint8_t*> (kWebVtt),< / div >
< div class = "line" > < a name = "l01643" > < / a > < span class = "lineno" > 1643< / span >   arraysize(kWebVtt) - 1);< / div >
< div class = "line" > < a name = "l01644" > < / a > < span class = "lineno" > 1644< / span >   }< / div >
< div class = "line" > < a name = "l01645" > < / a > < span class = "lineno" > 1645< / span >   < / div >
< div class = "line" > < a name = "l01646" > < / a > < span class = "lineno" > 1646< / span >   < span class = "keywordtype" > bool< / span > CheckTtml(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01647" > < / a > < span class = "lineno" > 1647< / span >   < span class = "comment" > // Sanity check first before reading the entire thing.< / span > < / div >
< div class = "line" > < a name = "l01648" > < / a > < span class = "lineno" > 1648< / span >   < span class = "keywordflow" > if< / span > (!StartsWith(buffer, buffer_size, < span class = "stringliteral" > " < ?xml" < / span > ))< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01649" > < / a > < span class = "lineno" > 1649< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l01650" > < / a > < span class = "lineno" > 1650< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01651" > < / a > < span class = "lineno" > 1651< / span >   < span class = "comment" > // Make sure that it can be parsed so that it doesn' t error later in the< / span > < / div >
< div class = "line" > < a name = "l01652" > < / a > < span class = "lineno" > 1652< / span >   < span class = "comment" > // process. Not doing a schema check to allow TTMLs that makes some sense but< / span > < / div >
< div class = "line" > < a name = "l01653" > < / a > < span class = "lineno" > 1653< / span >   < span class = "comment" > // not necessarily compliant to the schema.< / span > < / div >
< div class = "line" > < a name = "l01654" > < / a > < span class = "lineno" > 1654< / span >   xml::scoped_xml_ptr< xmlDoc> doc(< / div >
< div class = "line" > < a name = "l01655" > < / a > < span class = "lineno" > 1655< / span >   xmlParseMemory(reinterpret_cast< const char*> (buffer), buffer_size));< / div >
< div class = "line" > < a name = "l01656" > < / a > < span class = "lineno" > 1656< / span >   < span class = "keywordflow" > if< / span > (!doc)< / div >
< div class = "line" > < a name = "l01657" > < / a > < span class = "lineno" > 1657< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01658" > < / a > < span class = "lineno" > 1658< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01659" > < / a > < span class = "lineno" > 1659< / span >   xmlNodePtr root_node = xmlDocGetRootElement(doc.get());< / div >
< div class = "line" > < a name = "l01660" > < / a > < span class = "lineno" > 1660< / span >   std::string root_node_name(reinterpret_cast< const char*> (root_node-> name));< / div >
< div class = "line" > < a name = "l01661" > < / a > < span class = "lineno" > 1661< / span >   < span class = "comment" > // " tt" is supposed to be the top level element for ttml.< / span > < / div >
< div class = "line" > < a name = "l01662" > < / a > < span class = "lineno" > 1662< / span >   < span class = "keywordflow" > return< / span > root_node_name == < span class = "stringliteral" > " tt" < / span > ;< / div >
< div class = "line" > < a name = "l01663" > < / a > < span class = "lineno" > 1663< / span >   }< / div >
< div class = "line" > < a name = "l01664" > < / a > < span class = "lineno" > 1664< / span >   < / div >
< div class = "line" > < a name = "l01665" > < / a > < span class = "lineno" > 1665< / span >   } < span class = "comment" > // namespace< / span > < / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01666" > < / a > < span class = "lineno" > 1666< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01667" > < / a > < span class = "lineno" > 1667< / span >   < span class = "comment" > // Attempt to determine the container name from the buffer provided.< / span > < / div >
< div class = "line" > < a name = "l01668" > < / a > < span class = "lineno" > 1668< / span >   MediaContainerName DetermineContainer(< span class = "keyword" > const< / span > uint8_t* buffer, < span class = "keywordtype" > int< / span > buffer_size) {< / div >
< div class = "line" > < a name = "l01669" > < / a > < span class = "lineno" > 1669< / span >   DCHECK(buffer);< / div >
< div class = "line" > < a name = "l01670" > < / a > < span class = "lineno" > 1670< / span >   < / div >
< div class = "line" > < a name = "l01671" > < / a > < span class = "lineno" > 1671< / span >   < span class = "comment" > // Since MOV/QuickTime/MPEG4 streams are common, check for them first.< / span > < / div >
< div class = "line" > < a name = "l01672" > < / a > < span class = "lineno" > 1672< / span >   < span class = "keywordflow" > if< / span > (CheckMov(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01673" > < / a > < span class = "lineno" > 1673< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MOV;< / div >
< div class = "line" > < a name = "l01674" > < / a > < span class = "lineno" > 1674< / span >   < / div >
< div class = "line" > < a name = "l01675" > < / a > < span class = "lineno" > 1675< / span >   < span class = "comment" > // Next attempt the simple checks, that typically look at just the< / span > < / div >
< div class = "line" > < a name = "l01676" > < / a > < span class = "lineno" > 1676< / span >   < span class = "comment" > // first few bytes of the file.< / span > < / div >
< div class = "line" > < a name = "l01677" > < / a > < span class = "lineno" > 1677< / span >   MediaContainerName result = LookupContainerByFirst4(buffer, buffer_size);< / div >
< div class = "line" > < a name = "l01678" > < / a > < span class = "lineno" > 1678< / span >   < span class = "keywordflow" > if< / span > (result != CONTAINER_UNKNOWN)< / div >
< div class = "line" > < a name = "l01679" > < / a > < span class = "lineno" > 1679< / span >   < span class = "keywordflow" > return< / span > result;< / div >
< div class = "line" > < a name = "l01680" > < / a > < span class = "lineno" > 1680< / span >   < / div >
< div class = "line" > < a name = "l01681" > < / a > < span class = "lineno" > 1681< / span >   < span class = "comment" > // WebVTT check only checks for the first few bytes.< / span > < / div >
< div class = "line" > < a name = "l01682" > < / a > < span class = "lineno" > 1682< / span >   < span class = "keywordflow" > if< / span > (CheckWebVtt(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01683" > < / a > < span class = "lineno" > 1683< / span >   < span class = "keywordflow" > return< / span > CONTAINER_WEBVTT;< / div >
< div class = "line" > < a name = "l01684" > < / a > < span class = "lineno" > 1684< / span >   < / div >
< div class = "line" > < a name = "l01685" > < / a > < span class = "lineno" > 1685< / span >   < span class = "comment" > // Additional checks that may scan a portion of the buffer.< / span > < / div >
< div class = "line" > < a name = "l01686" > < / a > < span class = "lineno" > 1686< / span >   < span class = "keywordflow" > if< / span > (CheckMpeg2ProgramStream(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01687" > < / a > < span class = "lineno" > 1687< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MPEG2PS;< / div >
< div class = "line" > < a name = "l01688" > < / a > < span class = "lineno" > 1688< / span >   < span class = "keywordflow" > if< / span > (CheckMpeg2TransportStream(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01689" > < / a > < span class = "lineno" > 1689< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MPEG2TS;< / div >
< div class = "line" > < a name = "l01690" > < / a > < span class = "lineno" > 1690< / span >   < span class = "keywordflow" > if< / span > (CheckMJpeg(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01691" > < / a > < span class = "lineno" > 1691< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MJPEG;< / div >
< div class = "line" > < a name = "l01692" > < / a > < span class = "lineno" > 1692< / span >   < span class = "keywordflow" > if< / span > (CheckDV(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01693" > < / a > < span class = "lineno" > 1693< / span >   < span class = "keywordflow" > return< / span > CONTAINER_DV;< / div >
< div class = "line" > < a name = "l01694" > < / a > < span class = "lineno" > 1694< / span >   < span class = "keywordflow" > if< / span > (CheckH261(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01695" > < / a > < span class = "lineno" > 1695< / span >   < span class = "keywordflow" > return< / span > CONTAINER_H261;< / div >
< div class = "line" > < a name = "l01696" > < / a > < span class = "lineno" > 1696< / span >   < span class = "keywordflow" > if< / span > (CheckH263(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01697" > < / a > < span class = "lineno" > 1697< / span >   < span class = "keywordflow" > return< / span > CONTAINER_H263;< / div >
< div class = "line" > < a name = "l01698" > < / a > < span class = "lineno" > 1698< / span >   < span class = "keywordflow" > if< / span > (CheckH264(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01699" > < / a > < span class = "lineno" > 1699< / span >   < span class = "keywordflow" > return< / span > CONTAINER_H264;< / div >
< div class = "line" > < a name = "l01700" > < / a > < span class = "lineno" > 1700< / span >   < span class = "keywordflow" > if< / span > (CheckMpeg4BitStream(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01701" > < / a > < span class = "lineno" > 1701< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MPEG4BS;< / div >
< div class = "line" > < a name = "l01702" > < / a > < span class = "lineno" > 1702< / span >   < span class = "keywordflow" > if< / span > (CheckVC1(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01703" > < / a > < span class = "lineno" > 1703< / span >   < span class = "keywordflow" > return< / span > CONTAINER_VC1;< / div >
< div class = "line" > < a name = "l01704" > < / a > < span class = "lineno" > 1704< / span >   < span class = "keywordflow" > if< / span > (CheckSrt(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01705" > < / a > < span class = "lineno" > 1705< / span >   < span class = "keywordflow" > return< / span > CONTAINER_SRT;< / div >
< div class = "line" > < a name = "l01706" > < / a > < span class = "lineno" > 1706< / span >   < span class = "keywordflow" > if< / span > (CheckGsm(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01707" > < / a > < span class = "lineno" > 1707< / span >   < span class = "keywordflow" > return< / span > CONTAINER_GSM;< / div >
< div class = "line" > < a name = "l01708" > < / a > < span class = "lineno" > 1708< / span >   < / div >
< div class = "line" > < a name = "l01709" > < / a > < span class = "lineno" > 1709< / span >   < span class = "comment" > // AC3/EAC3 might not start at the beginning of the stream,< / span > < / div >
< div class = "line" > < a name = "l01710" > < / a > < span class = "lineno" > 1710< / span >   < span class = "comment" > // so scan for a start code.< / span > < / div >
< div class = "line" > < a name = "l01711" > < / a > < span class = "lineno" > 1711< / span >   < span class = "keywordtype" > int< / span > offset = 1; < span class = "comment" > // No need to start at byte 0 due to First4 check.< / span > < / div >
< div class = "line" > < a name = "l01712" > < / a > < span class = "lineno" > 1712< / span >   < span class = "keywordflow" > if< / span > (AdvanceToStartCode(buffer, buffer_size, & offset, 4, 16, kAc3SyncWord)) {< / div >
< div class = "line" > < a name = "l01713" > < / a > < span class = "lineno" > 1713< / span >   < span class = "keywordflow" > if< / span > (CheckAc3(buffer + offset, buffer_size - offset))< / div >
< div class = "line" > < a name = "l01714" > < / a > < span class = "lineno" > 1714< / span >   < span class = "keywordflow" > return< / span > CONTAINER_AC3;< / div >
< div class = "line" > < a name = "l01715" > < / a > < span class = "lineno" > 1715< / span >   < span class = "keywordflow" > if< / span > (CheckEac3(buffer + offset, buffer_size - offset))< / div >
< div class = "line" > < a name = "l01716" > < / a > < span class = "lineno" > 1716< / span >   < span class = "keywordflow" > return< / span > CONTAINER_EAC3;< / div >
< div class = "line" > < a name = "l01717" > < / a > < span class = "lineno" > 1717< / span >   }< / div >
2016-06-08 00:58:09 +00:00
< div class = "line" > < a name = "l01718" > < / a > < span class = "lineno" > 1718< / span >   < / div >
2016-06-21 17:23:23 +00:00
< div class = "line" > < a name = "l01719" > < / a > < span class = "lineno" > 1719< / span >   < span class = "comment" > // To do a TTML check, it parses the XML which requires scanning< / span > < / div >
< div class = "line" > < a name = "l01720" > < / a > < span class = "lineno" > 1720< / span >   < span class = "comment" > // the whole content.< / span > < / div >
< div class = "line" > < a name = "l01721" > < / a > < span class = "lineno" > 1721< / span >   < span class = "keywordflow" > if< / span > (CheckTtml(buffer, buffer_size))< / div >
< div class = "line" > < a name = "l01722" > < / a > < span class = "lineno" > 1722< / span >   < span class = "keywordflow" > return< / span > CONTAINER_TTML;< / div >
< div class = "line" > < a name = "l01723" > < / a > < span class = "lineno" > 1723< / span >   < / div >
< div class = "line" > < a name = "l01724" > < / a > < span class = "lineno" > 1724< / span >   < span class = "keywordflow" > return< / span > CONTAINER_UNKNOWN;< / div >
< div class = "line" > < a name = "l01725" > < / a > < span class = "lineno" > 1725< / span >   }< / div >
< div class = "line" > < a name = "l01726" > < / a > < span class = "lineno" > 1726< / span >   < / div >
< div class = "line" > < a name = "l01727" > < / a > < span class = "lineno" > 1727< / span >   MediaContainerName DetermineContainerFromFormatName(< / div >
< div class = "line" > < a name = "l01728" > < / a > < span class = "lineno" > 1728< / span >   < span class = "keyword" > const< / span > std::string& format_name) {< / div >
< div class = "line" > < a name = "l01729" > < / a > < span class = "lineno" > 1729< / span >   < span class = "keywordflow" > if< / span > (base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " webm" < / span > )) {< / div >
< div class = "line" > < a name = "l01730" > < / a > < span class = "lineno" > 1730< / span >   < span class = "keywordflow" > return< / span > CONTAINER_WEBM;< / div >
< div class = "line" > < a name = "l01731" > < / a > < span class = "lineno" > 1731< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " m4a" < / span > ) ||< / div >
< div class = "line" > < a name = "l01732" > < / a > < span class = "lineno" > 1732< / span >   base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " m4v" < / span > ) ||< / div >
< div class = "line" > < a name = "l01733" > < / a > < span class = "lineno" > 1733< / span >   base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " mp4" < / span > ) ||< / div >
< div class = "line" > < a name = "l01734" > < / a > < span class = "lineno" > 1734< / span >   base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " mov" < / span > )) {< / div >
< div class = "line" > < a name = "l01735" > < / a > < span class = "lineno" > 1735< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MOV;< / div >
< div class = "line" > < a name = "l01736" > < / a > < span class = "lineno" > 1736< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " ts" < / span > ) ||< / div >
< div class = "line" > < a name = "l01737" > < / a > < span class = "lineno" > 1737< / span >   base::EqualsCaseInsensitiveASCII(format_name, < span class = "stringliteral" > " mpeg2ts" < / span > )) {< / div >
< div class = "line" > < a name = "l01738" > < / a > < span class = "lineno" > 1738< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MPEG2TS;< / div >
< div class = "line" > < a name = "l01739" > < / a > < span class = "lineno" > 1739< / span >   }< / div >
< div class = "line" > < a name = "l01740" > < / a > < span class = "lineno" > 1740< / span >   < span class = "keywordflow" > return< / span > CONTAINER_UNKNOWN;< / div >
< div class = "line" > < a name = "l01741" > < / a > < span class = "lineno" > 1741< / span >   }< / div >
< div class = "line" > < a name = "l01742" > < / a > < span class = "lineno" > 1742< / span >   < / div >
< div class = "line" > < a name = "l01743" > < / a > < span class = "lineno" > 1743< / span >   MediaContainerName DetermineContainerFromFileName(< / div >
< div class = "line" > < a name = "l01744" > < / a > < span class = "lineno" > 1744< / span >   < span class = "keyword" > const< / span > std::string& file_name) {< / div >
< div class = "line" > < a name = "l01745" > < / a > < span class = "lineno" > 1745< / span >   < span class = "keywordflow" > if< / span > (base::EndsWith(file_name, < span class = "stringliteral" > " .webm" < / span > ,< / div >
< div class = "line" > < a name = "l01746" > < / a > < span class = "lineno" > 1746< / span >   base::CompareCase::INSENSITIVE_ASCII)) {< / div >
< div class = "line" > < a name = "l01747" > < / a > < span class = "lineno" > 1747< / span >   < span class = "keywordflow" > return< / span > CONTAINER_WEBM;< / div >
< div class = "line" > < a name = "l01748" > < / a > < span class = "lineno" > 1748< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EndsWith(file_name, < span class = "stringliteral" > " .mp4" < / span > ,< / div >
< div class = "line" > < a name = "l01749" > < / a > < span class = "lineno" > 1749< / span >   base::CompareCase::INSENSITIVE_ASCII) ||< / div >
< div class = "line" > < a name = "l01750" > < / a > < span class = "lineno" > 1750< / span >   base::EndsWith(file_name, < span class = "stringliteral" > " .m4a" < / span > ,< / div >
< div class = "line" > < a name = "l01751" > < / a > < span class = "lineno" > 1751< / span >   base::CompareCase::INSENSITIVE_ASCII) ||< / div >
< div class = "line" > < a name = "l01752" > < / a > < span class = "lineno" > 1752< / span >   base::EndsWith(file_name, < span class = "stringliteral" > " .m4v" < / span > ,< / div >
< div class = "line" > < a name = "l01753" > < / a > < span class = "lineno" > 1753< / span >   base::CompareCase::INSENSITIVE_ASCII)) {< / div >
< div class = "line" > < a name = "l01754" > < / a > < span class = "lineno" > 1754< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MOV;< / div >
< div class = "line" > < a name = "l01755" > < / a > < span class = "lineno" > 1755< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EndsWith(file_name, < span class = "stringliteral" > " .ts" < / span > ,< / div >
< div class = "line" > < a name = "l01756" > < / a > < span class = "lineno" > 1756< / span >   base::CompareCase::INSENSITIVE_ASCII)) {< / div >
< div class = "line" > < a name = "l01757" > < / a > < span class = "lineno" > 1757< / span >   < span class = "keywordflow" > return< / span > CONTAINER_MPEG2TS;< / div >
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< div class = "line" > < a name = "l01758" > < / a > < span class = "lineno" > 1758< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EndsWith(file_name, < span class = "stringliteral" > " .vtt" < / span > ,< / div >
< div class = "line" > < a name = "l01759" > < / a > < span class = "lineno" > 1759< / span >   base::CompareCase::INSENSITIVE_ASCII)) {< / div >
< div class = "line" > < a name = "l01760" > < / a > < span class = "lineno" > 1760< / span >   < span class = "keywordflow" > return< / span > CONTAINER_WEBVTT;< / div >
< div class = "line" > < a name = "l01761" > < / a > < span class = "lineno" > 1761< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EndsWith(file_name, < span class = "stringliteral" > " .ttml" < / span > ,< / div >
< div class = "line" > < a name = "l01762" > < / a > < span class = "lineno" > 1762< / span >   base::CompareCase::INSENSITIVE_ASCII)) {< / div >
< div class = "line" > < a name = "l01763" > < / a > < span class = "lineno" > 1763< / span >   < span class = "keywordflow" > return< / span > CONTAINER_TTML;< / div >
< div class = "line" > < a name = "l01764" > < / a > < span class = "lineno" > 1764< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (base::EndsWith(file_name, < span class = "stringliteral" > " .xml" < / span > ,< / div >
< div class = "line" > < a name = "l01765" > < / a > < span class = "lineno" > 1765< / span >   base::CompareCase::INSENSITIVE_ASCII)) {< / div >
< div class = "line" > < a name = "l01766" > < / a > < span class = "lineno" > 1766< / span >   < span class = "comment" > // In our supported containers, only ttml is in xml format.< / span > < / div >
< div class = "line" > < a name = "l01767" > < / a > < span class = "lineno" > 1767< / span >   < span class = "keywordflow" > return< / span > CONTAINER_TTML;< / div >
< div class = "line" > < a name = "l01768" > < / a > < span class = "lineno" > 1768< / span >   }< / div >
< div class = "line" > < a name = "l01769" > < / a > < span class = "lineno" > 1769< / span >   < span class = "keywordflow" > return< / span > CONTAINER_UNKNOWN;< / div >
< div class = "line" > < a name = "l01770" > < / a > < span class = "lineno" > 1770< / span >   }< / div >
< div class = "line" > < a name = "l01771" > < / a > < span class = "lineno" > 1771< / span >   < / div >
< div class = "line" > < a name = "l01772" > < / a > < span class = "lineno" > 1772< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l01773" > < / a > < span class = "lineno" > 1773< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
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< / div > <!-- fragment --> < / div > <!-- contents -->
<!-- start footer part -->
< hr class = "footer" / > < address class = "footer" > < small >
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Generated on Thu Aug 11 2016 22:33:20 for DASH Media Packaging SDK by   < a href = "http://www.doxygen.org/index.html" >
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< img class = "footer" src = "../../doxygen.png" alt = "doxygen" / >
< / a > 1.8.6
< / small > < / address >
< / body >
< / html >
