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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_65f7acfa8cf3a5f1edc11faa2428b914.html" > formats< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_f7dcbe7025bbacfc4b9a7dff6ad41d72.html" > mp2t< / a > < / li > < / ul >
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< div class = "title" > adts_header.cc< / div > < / div >
< / div > <!-- header -->
< div class = "contents" >
< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2014 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 >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "preprocessor" > #include " packager/media/formats/mp2t/adts_header.h" < / span > < / div >
< 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/media/base/bit_reader.h" < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include " packager/media/formats/mp2t/mp2t_common.h" < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include " packager/media/formats/mpeg/adts_constants.h" < / span > < / div >
< 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 > mp2t {< / 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 >   AdtsHeader::AdtsHeader()< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   : valid_config_(false),< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   profile_(0),< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   sampling_frequency_index_(0),< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   channel_configuration_(0) {}< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < / div >
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< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a149fb9c7fa2718d719008af2dce8157f" > 23< / a > < / span >   < span class = "keywordtype" > size_t< / span > AdtsHeader::GetAdtsFrameSize(< span class = "keyword" > const< / span > uint8_t* data, < span class = "keywordtype" > size_t< / span > num_bytes) {< / div >
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< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "keywordflow" > if< / span > (num_bytes < 6)< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "keywordflow" > return< / span > ((static_cast< int> (data[5]) > > 5) |< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   (static_cast< int> (data[4]) < < 3) |< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   ((static_cast< int> (data[3]) & 0x3) < < 11));< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   }< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < / div >
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< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a107e1269d5f826583c1940fb50c8cf92" > 31< / a > < / span >   < span class = "keywordtype" > size_t< / span > AdtsHeader::GetAdtsHeaderSize(< span class = "keyword" > const< / span > uint8_t* data, < span class = "keywordtype" > size_t< / span > num_bytes) {< / div >
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< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "keywordflow" > if< / span > (num_bytes < 2)< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordflow" > if< / span > (data[1] & 0x01)< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "keywordflow" > return< / span > kAdtsHeaderMinSize;< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keywordflow" > return< / span > kAdtsHeaderMinSize + < span class = "keyword" > sizeof< / span > (uint16_t); < span class = "comment" > // Header + CRC.< / span > < / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   }< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < / div >
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< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a2e154d7423498baf8cd8888c70dcfca9" > 39< / a > < / span >   < span class = "keywordtype" > bool< / span > AdtsHeader::Parse(< span class = "keyword" > const< / span > uint8_t* adts_frame, < span class = "keywordtype" > size_t< / span > adts_frame_size) {< / div >
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< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   CHECK(adts_frame);< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   valid_config_ = < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < / div >
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< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html" > BitReader< / a > frame(adts_frame, adts_frame_size);< / div >
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< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   < span class = "comment" > // Verify frame starts with sync bits (0xfff).< / span > < / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   uint32_t sync;< / div >
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< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (12, & sync));< / div >
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< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   RCHECK(sync == 0xfff);< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < span class = "comment" > // Skip MPEG version and layer.< / span > < / div >
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< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d" > SkipBits< / a > (3));< / div >
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< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "comment" > // Get " protection absent" flag.< / span > < / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   uint8_t protection_absent;< / div >
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< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (1, & protection_absent));< / div >
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< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "comment" > // Get profile.< / span > < / div >
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< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (2, & profile_));< / div >
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< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "comment" > // Get sampling frequency.< / span > < / div >
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< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (4, & sampling_frequency_index_));< / div >
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< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   RCHECK(sampling_frequency_index_ < kAdtsFrequencyTableSize);< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "comment" > // Skip private stream bit.< / span > < / div >
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< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d" > SkipBits< / a > (1));< / div >
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< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "comment" > // Get number of audio channels.< / span > < / div >
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< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (3, & channel_configuration_));< / div >
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< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   RCHECK((channel_configuration_ > 0) & & < / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   (channel_configuration_ < kAdtsNumChannelsTableSize));< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "comment" > // Skip originality, home and copyright info.< / span > < / div >
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< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d" > SkipBits< / a > (4));< / div >
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< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < span class = "comment" > // Verify that the frame size matches input parameters.< / span > < / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   uint16_t frame_size;< / div >
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< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (13, & frame_size));< / div >
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< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   RCHECK(frame_size == adts_frame_size);< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < span class = "comment" > // Skip buffer fullness indicator.< / span > < / div >
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< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d" > SkipBits< / a > (11));< / div >
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< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   uint8_t num_blocks_minus_1;< / div >
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< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   RCHECK(frame.< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (2, & num_blocks_minus_1));< / div >
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< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "keywordflow" > if< / span > (num_blocks_minus_1) {< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   NOTIMPLEMENTED() < < < span class = "stringliteral" > " ADTS frames with more than one data block " < / span > < / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   < span class = "stringliteral" > " not supported." < / span > ;< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / 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 >   valid_config_ = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / 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 >   < / div >
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< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a5ca14cc4eb4a28906fe832ab263ba5a2" > 85< / a > < / span >   < span class = "keywordtype" > bool< / span > AdtsHeader::GetAudioSpecificConfig(std::vector< uint8_t> * buffer)< span class = "keyword" > const < / span > {< / div >
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< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   DCHECK(buffer);< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < span class = "keywordflow" > if< / span > (!valid_config_)< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   buffer-> resize(2);< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   (*buffer)[0] = ((profile_ + 1) < < 3) | (sampling_frequency_index_ > > 1);< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   (*buffer)[1] = ((sampling_frequency_index_ & 1) < < 7) |< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   (channel_configuration_ < < 3);< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   }< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < / div >
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< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a156a3288ab974557e95dfaba72e6b479" > 97< / a > < / span >   uint8_t AdtsHeader::GetObjectType()< span class = "keyword" > const < / span > {< / div >
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< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "keywordflow" > return< / span > profile_ + 1;< / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   }< / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < / div >
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< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#afda9a7656576556af8ddec599d5d8d3b" > 101< / a > < / span >   uint32_t AdtsHeader::GetSamplingFrequency()< span class = "keyword" > const < / span > {< / div >
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< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   DCHECK_LT(sampling_frequency_index_, kAdtsFrequencyTableSize);< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < span class = "keywordflow" > return< / span > kAdtsFrequencyTable[sampling_frequency_index_];< / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   }< / 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" > < a class = "line" href = "../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#aaa01e3eb1ce9d4400aedd202b04f7160" > 106< / a > < / span >   uint8_t AdtsHeader::GetNumChannels()< span class = "keyword" > const < / span > {< / div >
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< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   DCHECK_GT(channel_configuration_, 0);< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   DCHECK_LT(channel_configuration_, kAdtsNumChannelsTableSize);< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < span class = "keywordflow" > return< / span > kAdtsNumChannelsTable[channel_configuration_];< / 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 >   < / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   } < span class = "comment" > // namespace mp2t< / span > < / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   } < span class = "comment" > // namespace media< / span > < / div >
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< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
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< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_ae40382c4ca4a57b3bb3531a337aebbe4" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > shaka::media::BitReader::ReadBits< / a > < / div > < div class = "ttdeci" > bool ReadBits(size_t num_bits, T *out)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d4/dd3/bit__reader_8h_source.html#l00035" > bit_reader.h:35< / a > < / div > < / div >
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< 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 >
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< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_a4ab20ef220c76072eaecb982aba0541d" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d" > shaka::media::BitReader::SkipBits< / a > < / div > < div class = "ttdeci" > bool SkipBits(size_t 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 >
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