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< title > DASH Media Packaging SDK: media/codecs/vp8_parser.cc Source File< / title >
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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_0494b8c96e3190a776d2b97ade9c8ddf.html" > codecs< / a > < / li > < / ul >
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< div class = "title" > vp8_parser.cc< / div > < / div >
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< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2015 Google Inc. All rights reserved.< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // Use of this source code is governed by a BSD-style< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > // license that can be found in the LICENSE file or at< / span > < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "comment" > // https://developers.google.com/open-source/licenses/bsd< / 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 " packager/media/codecs/vp8_parser.h" < / span > < / div >
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< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < / div >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include " packager/media/base/bit_reader.h" < / span > < / div >
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< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include " packager/media/base/rcheck.h" < / span > < / div >
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< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < / div >
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< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "keyword" > namespace < / span > shaka {< / div >
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< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "keyword" > namespace < / span > media {< / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > {< / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "keyword" > const< / span > uint32_t MB_FEATURE_TREE_PROBS = 3;< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "keyword" > const< / span > uint32_t MAX_MB_SEGMENTS = 4;< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "keyword" > const< / span > uint32_t MAX_REF_LF_DELTAS = 4;< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < span class = "keyword" > const< / span > uint32_t MAX_MODE_LF_DELTAS = 4;< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "keyword" > const< / span > uint32_t MB_LVL_MAX = 2;< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "keyword" > const< / span > uint32_t MB_FEATURE_DATA_BITS[MB_LVL_MAX] = {7, 6};< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "keywordtype" > bool< / span > VerifySyncCode(< span class = "keyword" > const< / span > uint8_t* data) {< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "keywordflow" > return< / span > data[0] == 0x9d & & data[1] == 0x01 & & data[2] == 0x2a;< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   }< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keywordtype" > bool< / span > ReadSegmentation(BitReader* reader) {< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "keywordtype" > bool< / span > enabled;< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   RCHECK(reader-> ReadBits(1, & enabled));< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "keywordflow" > if< / span > (!enabled)< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordtype" > bool< / span > update_map;< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   RCHECK(reader-> ReadBits(1, & update_map));< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keywordtype" > bool< / span > update_data;< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   RCHECK(reader-> ReadBits(1, & update_data));< / div >
< 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 >   < span class = "keywordflow" > if< / span > (update_data) {< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   RCHECK(reader-> SkipBits(1)); < span class = "comment" > // abs_delta< / span > < / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "keywordflow" > for< / span > (uint32_t i = 0; i < MAX_MB_SEGMENTS; ++i)< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < span class = "keywordflow" > for< / span > (uint32_t j = 0; j < MB_LVL_MAX; ++j) {< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , MB_FEATURE_DATA_BITS[j] + 1));< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   }< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   }< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   < span class = "keywordflow" > if< / span > (update_map) {< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   < span class = "keywordflow" > for< / span > (uint32_t i = 0; i < MB_FEATURE_TREE_PROBS; ++i)< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 8));< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   }< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   }< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   < span class = "keywordtype" > bool< / span > ReadLoopFilter(BitReader* reader) {< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   RCHECK(reader-> SkipBits(10)); < span class = "comment" > // filter_type, filter_evel, sharness_level< / span > < / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "keywordtype" > bool< / span > mode_ref_delta_enabled;< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   RCHECK(reader-> ReadBits(1, & mode_ref_delta_enabled));< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < span class = "keywordflow" > if< / span > (!mode_ref_delta_enabled)< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordtype" > bool< / span > mode_ref_delta_update;< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   RCHECK(reader-> ReadBits(1, & mode_ref_delta_update));< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keywordflow" > if< / span > (!mode_ref_delta_update)< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / 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 = "keywordflow" > for< / span > (uint32_t i = 0; i < MAX_REF_LF_DELTAS + MAX_MODE_LF_DELTAS; ++i)< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 6 + 1));< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   }< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   < span class = "keywordtype" > bool< / span > ReadQuantization(BitReader* reader) {< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   uint32_t yac_index;< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   RCHECK(reader-> ReadBits(7, & yac_index));< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   VLOG(4) < < < span class = "stringliteral" > " yac_index: " < / span > < < yac_index;< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 4 + 1)); < span class = "comment" > // y dc delta< / span > < / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 4 + 1)); < span class = "comment" > // y2 dc delta< / span > < / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 4 + 1)); < span class = "comment" > // y2 ac delta< / span > < / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 4 + 1)); < span class = "comment" > // chroma dc delta< / span > < / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   RCHECK(reader-> SkipBitsConditional(< span class = "keyword" > true< / span > , 4 + 1)); < span class = "comment" > // chroma ac delta< / span > < / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   }< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < span class = "keywordtype" > bool< / span > ReadRefreshFrame(BitReader* reader) {< / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < span class = "keywordtype" > bool< / span > refresh_golden_frame;< / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   RCHECK(reader-> ReadBits(1, & refresh_golden_frame));< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "keywordtype" > bool< / span > refresh_altref_frame;< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   RCHECK(reader-> ReadBits(1, & refresh_altref_frame));< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < span class = "keywordflow" > if< / span > (!refresh_golden_frame)< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   RCHECK(reader-> SkipBits(2)); < span class = "comment" > // buffer copy flag< / span > < / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < span class = "keywordflow" > if< / span > (!refresh_altref_frame)< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   RCHECK(reader-> SkipBits(2)); < span class = "comment" > // buffer copy flag< / span > < / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   RCHECK(reader-> SkipBits(2)); < span class = "comment" > // sign bias flags< / span > < / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   }< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   } < span class = "comment" > // namespace< / span > < / 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 >   VP8Parser::VP8Parser() : width_(0), height_(0) {}< / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   VP8Parser::~VP8Parser() {}< / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < / div >
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< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > < a class = "line" href = "../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#a8baec0e4c74b0b220b777426d0c463e1" > 100< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#a8baec0e4c74b0b220b777426d0c463e1" > VP8Parser::Parse< / a > (< span class = "keyword" > const< / span > uint8_t* data,< / div >
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< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < span class = "keywordtype" > size_t< / span > data_size,< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   std::vector< VPxFrameInfo> * vpx_frames) {< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   DCHECK(data);< / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   DCHECK(vpx_frames);< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < / div >
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< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html" > BitReader< / a > reader(data, data_size);< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < span class = "comment" > // The following 3 bytes are read directly from |data|.< / span > < / div >
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< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#afe1b515788b0079fae42dbb43189121a" > SkipBytes< / a > (3));< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   < span class = "comment" > // One bit for frame type.< / span > < / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   < span class = "keywordtype" > bool< / span > is_interframe = data[0] & 1;< / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   < span class = "comment" > // 3-bit version number with 2 bits for profile and the other bit reserved for< / span > < / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < span class = "comment" > // future variants.< / span > < / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   uint8_t profile = (data[0] > > 1) & 3;< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   < span class = "comment" > // One bit for show frame flag.< / span > < / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   < span class = "comment" > // Then 19 bits (the remaining 3 bits in the first byte + next two bytes) for< / span > < / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < span class = "comment" > // header size.< / span > < / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   uint32_t header_size = (data[0] | (data[1] < < 8) | (data[2] < < 16)) > > 5;< / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   RCHECK(header_size < = data_size);< / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   < span class = "keywordflow" > if< / span > (!is_interframe) {< / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < span class = "comment" > // The following 7 bytes are read directly from |data|.< / span > < / div >
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< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#afe1b515788b0079fae42dbb43189121a" > SkipBytes< / a > (7));< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   RCHECK(VerifySyncCode(& data[3]));< / 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" > // Bits 0b11000000 for data[7] and data[9] are scaling.< / span > < / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   width_ = data[6] | ((data[7] & 0x3f) < < 8);< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   height_ = data[8] | ((data[9] & 0x3f) < < 8);< / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   < / div >
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< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7" > SkipBits< / a > (2)); < span class = "comment" > // colorspace and pixel value clamping.< / span > < / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / 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 >   RCHECK(ReadSegmentation(& reader));< / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   RCHECK(ReadLoopFilter(& reader));< / div >
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< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7" > SkipBits< / a > (2)); < span class = "comment" > // partitions bits< / span > < / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   RCHECK(ReadQuantization(& reader));< / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   < span class = "keywordflow" > if< / span > (is_interframe) {< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   RCHECK(ReadRefreshFrame(& reader));< / div >
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< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7" > SkipBits< / a > (1)); < span class = "comment" > // refresh_entropy_probs< / span > < / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7" > SkipBits< / a > (1)); < span class = "comment" > // refresh last frame flag< / span > < / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   } < span class = "keywordflow" > else< / span > {< / div >
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< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   RCHECK(reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7" > SkipBits< / a > (1)); < span class = "comment" > // refresh_entropy_probs< / span > < / div >
2015-12-30 22:27:23 +00:00
< 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 >   < / div >
< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > 147< / span >   < span class = "comment" > // The next field is entropy header (coef probability tree), which is encoded< / span > < / div >
< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   < span class = "comment" > // using bool entropy encoder, i.e. compressed. We don' t consider it as part< / span > < / div >
< div class = "line" > < a name = "l00149" > < / a > < span class = "lineno" > 149< / span >   < span class = "comment" > // of uncompressed header.< / span > < / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   writable_codec_config()-> set_profile(profile);< / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   < span class = "comment" > // VP8 uses an 8-bit YUV 4:2:0 format.< / span > < / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   < span class = "comment" > // http://tools.ietf.org/html/rfc6386 Section 2.< / span > < / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   writable_codec_config()-> set_bit_depth(8);< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   writable_codec_config()-> set_chroma_subsampling(< / div >
2016-05-27 23:48:18 +00:00
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   VPCodecConfigurationRecord::CHROMA_420_COLLOCATED_WITH_LUMA);< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   < span class = "comment" > // VP8 uses YCrCb color space defined in ITU-R_BT.601.< / span > < / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   < span class = "comment" > // http://tools.ietf.org/html/rfc6386 Section 9.2.< / span > < / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   writable_codec_config()-> set_color_space(< / div >
2016-05-27 23:48:18 +00:00
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   VPCodecConfigurationRecord::COLOR_SPACE_BT_601);< / div >
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< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   < / div >
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< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   < a class = "code" href = "../../d0/d11/structshaka_1_1media_1_1VPxFrameInfo.html" > VPxFrameInfo< / a > vpx_frame;< / div >
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< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   vpx_frame.frame_size = data_size;< / div >
< div class = "line" > < a name = "l00164" > < / a > < span class = "lineno" > 164< / span >   vpx_frame.uncompressed_header_size =< / div >
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< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   vpx_frame.frame_size - reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a159b687704c85f0938918197b7d3b23d" > bits_available< / a > () / 8;< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   vpx_frame.is_keyframe = !is_interframe;< / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   vpx_frame.width = width_;< / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   vpx_frame.height = height_;< / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   vpx_frames-> clear();< / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   vpx_frames-> push_back(vpx_frame);< / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   VLOG(3) < < < span class = "stringliteral" > " \n frame_size: " < / span > < < vpx_frame.frame_size< / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < < < span class = "stringliteral" > " \n uncompressed_header_size: " < / span > < / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < < vpx_frame.uncompressed_header_size< / div >
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< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   < < < span class = "stringliteral" > " \n bits read: " < / span > < < reader.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a580e91c610d3d58bee0f4f4ed8ef12ef" > bit_position< / a > ()< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < < < span class = "stringliteral" > " \n header_size: " < / span > < < header_size< / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   < < < span class = "stringliteral" > " \n width: " < / span > < < vpx_frame.width< / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   < < < span class = "stringliteral" > " \n height: " < / span > < < vpx_frame.height;< / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   }< / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   < / div >
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< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > < a class = "line" href = "../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#afae2dcb0c2652d53f2e23c9d3c07db37" > 183< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#afae2dcb0c2652d53f2e23c9d3c07db37" > VP8Parser::IsKeyframe< / a > (< span class = "keyword" > const< / span > uint8_t* data, < span class = "keywordtype" > size_t< / span > data_size) {< / div >
2015-12-30 22:27:23 +00:00
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   < span class = "comment" > // Make sure the block is big enough for the minimal keyframe header size.< / span > < / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   < span class = "keywordflow" > if< / span > (data_size < 10)< / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / 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" > // The LSb of the first byte must be a 0 for a keyframe.< / span > < / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   < span class = "keywordflow" > if< / span > ((data[0] & 0x01) != 0)< / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   < span class = "keywordflow" > return< / span > VerifySyncCode(& data[3]);< / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   }< / 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" > // namespace media< / span > < / div >
2016-05-24 23:43:16 +00:00
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html" > shaka::media::BitReader< / a > < / div > < div class = "ttdoc" > A class to read bit streams. < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d4/dd3/bit__reader_8h_source.html#l00017" > bit_reader.h:17< / a > < / div > < / div >
< div class = "ttc" id = "structshaka_1_1media_1_1VPxFrameInfo_html" > < div class = "ttname" > < a href = "../../d0/d11/structshaka_1_1media_1_1VPxFrameInfo.html" > shaka::media::VPxFrameInfo< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../df/d8a/vpx__parser_8h_source.html#l00019" > vpx_parser.h:19< / a > < / div > < / div >
< div class = "ttc" id = "classshaka_1_1media_1_1VP8Parser_html_a8baec0e4c74b0b220b777426d0c463e1" > < div class = "ttname" > < a href = "../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#a8baec0e4c74b0b220b777426d0c463e1" > shaka::media::VP8Parser::Parse< / a > < / div > < div class = "ttdeci" > bool Parse(const uint8_t *data, size_t data_size, std::vector< VPxFrameInfo > *vpx_frames) override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d1/d70/vp8__parser_8cc_source.html#l00100" > vp8_parser.cc:100< / a > < / div > < / div >
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_afe1b515788b0079fae42dbb43189121a" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#afe1b515788b0079fae42dbb43189121a" > shaka::media::BitReader::SkipBytes< / a > < / div > < div class = "ttdeci" > bool SkipBytes(int num_bytes)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d5/de0/bit__reader_8cc_source.html#l00056" > bit_reader.cc:56< / a > < / div > < / div >
2016-08-18 20:58:33 +00:00
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_a159b687704c85f0938918197b7d3b23d" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a159b687704c85f0938918197b7d3b23d" > shaka::media::BitReader::bits_available< / a > < / div > < div class = "ttdeci" > int bits_available() const < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d4/dd3/bit__reader_8h_source.html#l00085" > bit_reader.h:85< / a > < / div > < / div >
2016-05-24 23:43:16 +00:00
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_a5c7e9d8cedb921042076770c8f6033d7" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7" > shaka::media::BitReader::SkipBits< / a > < / div > < div class = "ttdeci" > bool SkipBits(int num_bits)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d5/de0/bit__reader_8cc_source.html#l00024" > bit_reader.cc:24< / a > < / div > < / div >
< div class = "ttc" id = "classshaka_1_1media_1_1VP8Parser_html_afae2dcb0c2652d53f2e23c9d3c07db37" > < div class = "ttname" > < a href = "../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#afae2dcb0c2652d53f2e23c9d3c07db37" > shaka::media::VP8Parser::IsKeyframe< / a > < / div > < div class = "ttdeci" > static bool IsKeyframe(const uint8_t *data, size_t data_size)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d1/d70/vp8__parser_8cc_source.html#l00183" > vp8_parser.cc:183< / a > < / div > < / div >
2016-08-18 20:58:33 +00:00
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_a580e91c610d3d58bee0f4f4ed8ef12ef" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a580e91c610d3d58bee0f4f4ed8ef12ef" > shaka::media::BitReader::bit_position< / a > < / div > < div class = "ttdeci" > int bit_position() const < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d4/dd3/bit__reader_8h_source.html#l00090" > bit_reader.h:90< / a > < / div > < / div >
2015-12-30 22:27:23 +00:00
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