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< title > Shaka Packager SDK: packager/media/codecs/ec3_audio_util.cc Source File< / title >
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< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2016 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/codecs/ec3_audio_util.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/base/macros.h" < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include " packager/base/strings/string_number_conversions.h" < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include " packager/media/base/bit_reader.h" < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "preprocessor" > #include " packager/media/base/rcheck.h" < / 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 = "keyword" > namespace < / span > < a class = "code" href = "../../d8/daf/namespaceshaka.html" > shaka< / a > {< / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > media {< / 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" > namespace < / span > {< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "comment" > // Channels bit map. 16 bits.< / span > < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < span class = "comment" > // Bit, Location< / span > < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "comment" > // 0(MSB), Left< / span > < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "comment" > // 1, Center< / span > < / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < span class = "comment" > // 2, Right< / span > < / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "comment" > // 3, Left Surround< / span > < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "comment" > // 4, Right Surround< / span > < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "comment" > // 5, Left center/Right center pair< / span > < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < span class = "comment" > // 6, Left rear surround/Right rear surround pair< / span > < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "comment" > // 7, Center surround< / span > < / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "comment" > // 8, Top center surround< / span > < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "comment" > // 9, Left surround direct/Right surround direct pair< / span > < / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "comment" > // 10, Left wide/Right wide pair< / span > < / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "comment" > // 11, Lvertical height/Right vertical height pair< / span > < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "comment" > // 12, Center vertical height< / span > < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "comment" > // 13, Lts/Rts pair< / span > < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "comment" > // 14, LFE2< / span > < / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "comment" > // 15, LFE< / span > < / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keyword" > enum< / span > kEC3AudioChannelMap {< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   kLeft = 0x8000,< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   kCenter = 0x4000,< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   kRight = 0x2000,< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   kLeftSurround = 0x1000,< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   kRightSurround = 0x800,< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   kLcRcPair = 0x400,< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   kLrsRrsPair = 0x200,< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   kCenterSurround = 0x100,< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   kTopCenterSurround = 0x80,< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   kLsdRsdPair = 0x40,< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   kLwRwPair = 0x20,< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   kLvhRvhPair = 0x10,< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   kCenterVerticalHeight = 0x8,< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   kLtsRtsPair = 0x4,< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   kLFE2 = 0x2,< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   kLFEScreen = 0x1< / 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" > // Number of channels for the channel bit above. The first entry corresponds to< / span > < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "comment" > // kLeft, which has one channel. All the XxxPairs bits have two channels.< / span > < / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > size_t< / span > kChannelCountArray[] = {< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1, 2, 1, 1,< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   };< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   static_assert(arraysize(kChannelCountArray) == 16u,< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "stringliteral" > " Channel count array should have 16 entries." < / span > );< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   < span class = "comment" > // EC3 Audio coding mode map (acmod) to determine EC3 audio channel layout. The< / span > < / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   < span class = "comment" > // value stands for the existence of Left, Center, Right, Left surround, and< / span > < / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "comment" > // Right surround.< / span > < / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "keyword" > const< / span > uint16_t kEC3AudioCodingModeMap[] = {< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   kLeft | kRight,< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   kCenter,< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   kLeft | kRight,< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   kLeft | kCenter | kRight,< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   kLeft | kRight | kLeftSurround | kRightSurround,< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   kLeft | kCenter | kRight | kLeftSurround | kRightSurround,< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   kLeft | kRight | kLeftSurround | kRightSurround,< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   kLeft | kCenter | kRight | kLeftSurround | kRightSurround,< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   };< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   < span class = "comment" > // Reverse bit order.< / span > < / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   uint8_t ReverseBits8(uint8_t n) {< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   n = ((n > > 1) & 0x55) | ((n & 0x55) < < 1);< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   n = ((n > > 2) & 0x33) | ((n & 0x33) < < 2);< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < span class = "keywordflow" > return< / span > ((n > > 4) & 0x0f) | ((n & 0x0f) < < 4);< / 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 = "comment" > // Mapping of channel configurations to the MPEG audio value based on< / span > < / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "comment" > // ETSI TS 102 366 V1.4.1 Digital Audio Compression (AC-3, Enhanced AC-3)< / span > < / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   < span class = "comment" > // Standard Table I.1.1< / span > < / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   uint32_t EC3ChannelMaptoMPEGValue(uint32_t channel_map) {< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   uint32_t ret = 0;< / 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 >   < span class = "keywordflow" > switch< / span > (channel_map) {< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   < span class = "keywordflow" > case< / span > kCenter:< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   ret = 1;< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "keywordflow" > case< / span > kLeft | kRight:< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   ret = 2;< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "keywordflow" > case< / span > kCenter| kLeft | kRight:< / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   ret = 3;< / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kCenterSurround:< / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   ret = 4;< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLeftSurround | kRightSurround:< / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   ret = 5;< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLeftSurround | kRightSurround |< / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   kLFEScreen:< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   ret = 6;< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLwRwPair | kLeftSurround | kRightSurround |< / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   kLFEScreen:< / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   ret = 7;< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < span class = "keywordflow" > case< / span > kLeft | kRight | kCenterSurround:< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   ret = 9;< / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < span class = "keywordflow" > case< / span > kLeft | kRight | kLeftSurround | kRightSurround:< / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   ret = 10;< / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLrsRrsPair | kCenterSurround | kLFEScreen:< / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   ret = 11;< / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLeftSurround | kRightSurround |< / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   kLrsRrsPair | kLFEScreen:< / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   ret = 12;< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLeftSurround | kRightSurround |< / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   kLFEScreen | kLvhRvhPair:< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   ret = 14;< / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLeftSurround | kRightSurround |< / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   kLFEScreen | kLvhRvhPair | kLtsRtsPair:< / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   ret = 16;< / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLeftSurround | kRightSurround |< / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   kLFEScreen | kLvhRvhPair | kCenterVerticalHeight | kLtsRtsPair |< / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   kTopCenterSurround:< / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   ret = 17;< / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   < span class = "keywordflow" > case< / span > kCenter | kLeft | kRight | kLsdRsdPair | kLrsRrsPair | kLFEScreen |< / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   kLvhRvhPair | kLtsRtsPair:< / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   ret = 19;< / div >
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   < span class = "keywordflow" > break< / span > ;< / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   < span class = "keywordflow" > default< / span > :< / div >
< div class = "line" > < a name = "l00145" > < / a > < span class = "lineno" > 145< / span >   ret = 0xFFFFFFFF;< / 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 = "keywordflow" > return< / span > ret;< / div >
< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   }< / 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 = "keywordtype" > bool< / span > ExtractEc3Data(< span class = "keyword" > const< / span > std::vector< uint8_t> & ec3_data,< / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   uint8_t* audio_coding_mode,< / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   < span class = "keywordtype" > bool< / span > * lfe_channel_on,< / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   uint16_t* dependent_substreams_layout,< / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   uint32_t* ec3_joc_complexity) {< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   BitReader bit_reader(ec3_data.data(), ec3_data.size());< / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   < span class = "comment" > // Read number of independent substreams and parse the independent substreams.< / span > < / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   uint8_t number_independent_substreams;< / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   RCHECK(bit_reader.SkipBits(13) & & < / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   bit_reader.ReadBits(3, & number_independent_substreams));< / div >
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   < span class = "comment" > // The value of this field is one less than the number of independent< / span > < / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   < span class = "comment" > // substreams present.< / span > < / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   ++number_independent_substreams;< / 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" > // Parse audio_coding_mode, dependent_substreams_layout and lfe_channel_on< / span > < / div >
< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   < span class = "comment" > // from the first independent substream.< / span > < / div >
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   < span class = "comment" > // Independent substream in EC3Specific box:< / span > < / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   < span class = "comment" > // fscod: 2 bits< / span > < / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   < span class = "comment" > // bsid: 5 bits< / span > < / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < span class = "comment" > // reserved_1: 1 bit< / span > < / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   < span class = "comment" > // asvc: 1 bit< / span > < / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   < span class = "comment" > // bsmod: 3 bits< / span > < / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < span class = "comment" > // acmod: 3 bits< / span > < / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   < span class = "comment" > // lfeon: 1 bit< / span > < / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < span class = "comment" > // reserved_2: 3 bits< / span > < / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < span class = "comment" > // num_dep_sub: 4 bits< / span > < / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   < span class = "comment" > // If num_dep_sub > 0, chan_loc is present and the size is 9 bits.< / span > < / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < span class = "comment" > // Otherwise, reserved_3 is present and the size is 1 bit.< / span > < / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   < span class = "comment" > // chan_loc: 9 bits< / span > < / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   < span class = "comment" > // reserved_3: 1 bit< / span > < / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   RCHECK(bit_reader.SkipBits(12));< / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   RCHECK(bit_reader.ReadBits(3, audio_coding_mode));< / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   RCHECK(bit_reader.ReadBits(1, lfe_channel_on));< / div >
< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > 183< / span >   < / div >
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   uint8_t number_dependent_substreams = 0;< / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   RCHECK(bit_reader.SkipBits(3));< / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   RCHECK(bit_reader.ReadBits(4, & number_dependent_substreams));< / 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 >   *dependent_substreams_layout = 0;< / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   < span class = "keywordflow" > if< / span > (number_dependent_substreams > 0) {< / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   RCHECK(bit_reader.ReadBits(9, dependent_substreams_layout));< / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   RCHECK(bit_reader.SkipBits(1));< / 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 >   *ec3_joc_complexity = 0;< / div >
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   < span class = "keywordflow" > if< / span > (bit_reader.bits_available() < 16) {< / div >
< div class = "line" > < a name = "l00196" > < / a > < span class = "lineno" > 196< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00199" > < / a > < span class = "lineno" > 199< / span >   RCHECK(bit_reader.SkipBits(7));< / div >
< div class = "line" > < a name = "l00200" > < / a > < span class = "lineno" > 200< / span >   < span class = "keywordtype" > bool< / span > ec3_joc_flag;< / div >
< div class = "line" > < a name = "l00201" > < / a > < span class = "lineno" > 201< / span >   RCHECK(bit_reader.ReadBits(1, & ec3_joc_flag));< / div >
< div class = "line" > < a name = "l00202" > < / a > < span class = "lineno" > 202< / span >   < span class = "keywordflow" > if< / span > (ec3_joc_flag) {< / div >
< div class = "line" > < a name = "l00203" > < / a > < span class = "lineno" > 203< / span >   RCHECK(bit_reader.ReadBits(8, ec3_joc_complexity));< / div >
< div class = "line" > < a name = "l00204" > < / a > < span class = "lineno" > 204< / span >   }< / div >
< div class = "line" > < a name = "l00205" > < / a > < span class = "lineno" > 205< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00208" > < / a > < span class = "lineno" > 208< / span >   } < span class = "comment" > // namespace< / span > < / div >
< div class = "line" > < a name = "l00209" > < / a > < span class = "lineno" > 209< / span >   < / div >
< div class = "line" > < a name = "l00210" > < / a > < span class = "lineno" > 210< / span >   < span class = "keywordtype" > bool< / span > CalculateEC3ChannelMap(< span class = "keyword" > const< / span > std::vector< uint8_t> & ec3_data,< / div >
< div class = "line" > < a name = "l00211" > < / a > < span class = "lineno" > 211< / span >   uint32_t* channel_map) {< / div >
< div class = "line" > < a name = "l00212" > < / a > < span class = "lineno" > 212< / span >   uint8_t audio_coding_mode;< / div >
< div class = "line" > < a name = "l00213" > < / a > < span class = "lineno" > 213< / span >   < span class = "keywordtype" > bool< / span > lfe_channel_on;< / div >
< div class = "line" > < a name = "l00214" > < / a > < span class = "lineno" > 214< / span >   uint16_t dependent_substreams_layout;< / div >
< div class = "line" > < a name = "l00215" > < / a > < span class = "lineno" > 215< / span >   uint32_t ec3_joc_complexity;< / div >
< div class = "line" > < a name = "l00216" > < / a > < span class = "lineno" > 216< / span >   < span class = "keywordflow" > if< / span > (!ExtractEc3Data(ec3_data, & audio_coding_mode, & lfe_channel_on,< / div >
< div class = "line" > < a name = "l00217" > < / a > < span class = "lineno" > 217< / span >   & dependent_substreams_layout, & ec3_joc_complexity)) {< / div >
< div class = "line" > < a name = "l00218" > < / a > < span class = "lineno" > 218< / span >   LOG(WARNING) < < < span class = "stringliteral" > " Seeing invalid EC3 data: " < / span > < / div >
< div class = "line" > < a name = "l00219" > < / a > < span class = "lineno" > 219< / span >   < < base::HexEncode(ec3_data.data(), ec3_data.size());< / div >
< div class = "line" > < a name = "l00220" > < / a > < span class = "lineno" > 220< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00223" > < / a > < span class = "lineno" > 223< / span >   < span class = "comment" > // Dependent substreams layout bit map:< / span > < / div >
< div class = "line" > < a name = "l00224" > < / a > < span class = "lineno" > 224< / span >   < span class = "comment" > // Bit, Location< / span > < / div >
< div class = "line" > < a name = "l00225" > < / a > < span class = "lineno" > 225< / span >   < span class = "comment" > // 0, Lc/Rc pair< / span > < / div >
< div class = "line" > < a name = "l00226" > < / a > < span class = "lineno" > 226< / span >   < span class = "comment" > // 1, Lrs/Rrs pair< / span > < / div >
< div class = "line" > < a name = "l00227" > < / a > < span class = "lineno" > 227< / span >   < span class = "comment" > // 2, Cs< / span > < / div >
< div class = "line" > < a name = "l00228" > < / a > < span class = "lineno" > 228< / span >   < span class = "comment" > // 3, Ts< / span > < / div >
< div class = "line" > < a name = "l00229" > < / a > < span class = "lineno" > 229< / span >   < span class = "comment" > // 4, Lsd/Rsd pair< / span > < / div >
< div class = "line" > < a name = "l00230" > < / a > < span class = "lineno" > 230< / span >   < span class = "comment" > // 5, Lw/Rw pair< / span > < / div >
< div class = "line" > < a name = "l00231" > < / a > < span class = "lineno" > 231< / span >   < span class = "comment" > // 6, Lvh/Rvh pair< / span > < / div >
< div class = "line" > < a name = "l00232" > < / a > < span class = "lineno" > 232< / span >   < span class = "comment" > // 7, Cvh< / span > < / div >
< div class = "line" > < a name = "l00233" > < / a > < span class = "lineno" > 233< / span >   < span class = "comment" > // 8(MSB), LFE2< / span > < / div >
< div class = "line" > < a name = "l00234" > < / a > < span class = "lineno" > 234< / span >   < span class = "comment" > // Reverse bit order of dependent substreams channel layout (LFE2 not< / span > < / div >
< div class = "line" > < a name = "l00235" > < / a > < span class = "lineno" > 235< / span >   < span class = "comment" > // included) to apply on channel_map bit 5 - 12.< / span > < / div >
< div class = "line" > < a name = "l00236" > < / a > < span class = "lineno" > 236< / span >   < span class = "keyword" > const< / span > uint8_t reversed_dependent_substreams_layout =< / div >
< div class = "line" > < a name = "l00237" > < / a > < span class = "lineno" > 237< / span >   ReverseBits8(dependent_substreams_layout & 0xFF);< / div >
< div class = "line" > < a name = "l00238" > < / a > < span class = "lineno" > 238< / span >   < / div >
< div class = "line" > < a name = "l00239" > < / a > < span class = "lineno" > 239< / span >   *channel_map = kEC3AudioCodingModeMap[audio_coding_mode] |< / div >
< div class = "line" > < a name = "l00240" > < / a > < span class = "lineno" > 240< / span >   (reversed_dependent_substreams_layout < < 3);< / div >
< div class = "line" > < a name = "l00241" > < / a > < span class = "lineno" > 241< / span >   < span class = "keywordflow" > if< / span > (dependent_substreams_layout & 0x100)< / div >
< div class = "line" > < a name = "l00242" > < / a > < span class = "lineno" > 242< / span >   *channel_map |= kLFE2;< / div >
< div class = "line" > < a name = "l00243" > < / a > < span class = "lineno" > 243< / span >   < span class = "keywordflow" > if< / span > (lfe_channel_on)< / div >
< div class = "line" > < a name = "l00244" > < / a > < span class = "lineno" > 244< / span >   *channel_map |= kLFEScreen;< / div >
< div class = "line" > < a name = "l00245" > < / a > < span class = "lineno" > 245< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00246" > < / a > < span class = "lineno" > 246< / span >   }< / div >
< div class = "line" > < a name = "l00247" > < / a > < span class = "lineno" > 247< / span >   < / div >
< div class = "line" > < a name = "l00248" > < / a > < span class = "lineno" > 248< / span >   < span class = "keywordtype" > bool< / span > CalculateEC3ChannelMPEGValue(< span class = "keyword" > const< / span > std::vector< uint8_t> & ec3_data,< / div >
< div class = "line" > < a name = "l00249" > < / a > < span class = "lineno" > 249< / span >   uint32_t* ec3_channel_mpeg_value) {< / div >
< div class = "line" > < a name = "l00250" > < / a > < span class = "lineno" > 250< / span >   uint32_t channel_map;< / div >
< div class = "line" > < a name = "l00251" > < / a > < span class = "lineno" > 251< / span >   < span class = "keywordflow" > if< / span > (!CalculateEC3ChannelMap(ec3_data, & channel_map))< / div >
< div class = "line" > < a name = "l00252" > < / a > < span class = "lineno" > 252< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00253" > < / a > < span class = "lineno" > 253< / span >   *ec3_channel_mpeg_value = EC3ChannelMaptoMPEGValue(channel_map);< / div >
< div class = "line" > < a name = "l00254" > < / a > < span class = "lineno" > 254< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00257" > < / a > < span class = "lineno" > 257< / span >   < span class = "keywordtype" > size_t< / span > GetEc3NumChannels(< span class = "keyword" > const< / span > std::vector< uint8_t> & ec3_data) {< / div >
< div class = "line" > < a name = "l00258" > < / a > < span class = "lineno" > 258< / span >   uint32_t channel_map;< / div >
< div class = "line" > < a name = "l00259" > < / a > < span class = "lineno" > 259< / span >   < span class = "keywordflow" > if< / span > (!CalculateEC3ChannelMap(ec3_data, & channel_map))< / div >
< div class = "line" > < a name = "l00260" > < / a > < span class = "lineno" > 260< / span >   < span class = "keywordflow" > return< / span > 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 = "keywordtype" > size_t< / span > num_channels = 0;< / div >
< div class = "line" > < a name = "l00263" > < / a > < span class = "lineno" > 263< / span >   < span class = "keywordtype" > int< / span > bit = kLeft;< / div >
< div class = "line" > < a name = "l00264" > < / a > < span class = "lineno" > 264< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > size_t< / span > channel_count : kChannelCountArray) {< / div >
< div class = "line" > < a name = "l00265" > < / a > < span class = "lineno" > 265< / span >   < span class = "keywordflow" > if< / span > (channel_map & bit)< / div >
< div class = "line" > < a name = "l00266" > < / a > < span class = "lineno" > 266< / span >   num_channels += channel_count;< / div >
< div class = "line" > < a name = "l00267" > < / a > < span class = "lineno" > 267< / span >   bit > > = 1;< / 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 >   DCHECK_EQ(bit, 0);< / div >
< div class = "line" > < a name = "l00270" > < / a > < span class = "lineno" > 270< / span >   < span class = "keywordflow" > return< / span > num_channels;< / div >
< div class = "line" > < a name = "l00271" > < / a > < span class = "lineno" > 271< / span >   }< / div >
< div class = "line" > < a name = "l00272" > < / a > < span class = "lineno" > 272< / span >   < / div >
< div class = "line" > < a name = "l00273" > < / a > < span class = "lineno" > 273< / span >   < span class = "keywordtype" > bool< / span > GetEc3JocComplexity(< span class = "keyword" > const< / span > std::vector< uint8_t> & ec3_data,< / div >
< div class = "line" > < a name = "l00274" > < / a > < span class = "lineno" > 274< / span >   uint32_t* ec3_joc_complexity) {< / div >
< div class = "line" > < a name = "l00275" > < / a > < span class = "lineno" > 275< / span >   uint8_t audio_coding_mode;< / div >
< div class = "line" > < a name = "l00276" > < / a > < span class = "lineno" > 276< / span >   < span class = "keywordtype" > bool< / span > lfe_channel_on;< / div >
< div class = "line" > < a name = "l00277" > < / a > < span class = "lineno" > 277< / span >   uint16_t dependent_substreams_layout;< / div >
< div class = "line" > < a name = "l00278" > < / a > < span class = "lineno" > 278< / span >   < / div >
< div class = "line" > < a name = "l00279" > < / a > < span class = "lineno" > 279< / span >   < span class = "keywordflow" > if< / span > (!ExtractEc3Data(ec3_data, & audio_coding_mode, & lfe_channel_on,< / div >
< div class = "line" > < a name = "l00280" > < / a > < span class = "lineno" > 280< / span >   & dependent_substreams_layout, ec3_joc_complexity)) {< / div >
< div class = "line" > < a name = "l00281" > < / a > < span class = "lineno" > 281< / span >   LOG(WARNING) < < < span class = "stringliteral" > " Seeing invalid EC3 data: " < / span > < / div >
< div class = "line" > < a name = "l00282" > < / a > < span class = "lineno" > 282< / span >   < < base::HexEncode(ec3_data.data(), ec3_data.size());< / div >
< div class = "line" > < a name = "l00283" > < / a > < span class = "lineno" > 283< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00284" > < / a > < span class = "lineno" > 284< / span >   }< / div >
< div class = "line" > < a name = "l00285" > < / a > < span class = "lineno" > 285< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00288" > < / a > < span class = "lineno" > 288< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00289" > < / a > < span class = "lineno" > 289< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
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< / div > <!-- fragment --> < / div > <!-- contents -->
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< div class = "ttc" id = "anamespaceshaka_html" > < div class = "ttname" > < a href = "../../d8/daf/namespaceshaka.html" > shaka< / a > < / div > < div class = "ttdoc" > All the methods that are virtual are virtual for mocking.< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d4/d15/gflags__hex__bytes_8cc_source.html#l00011" > gflags_hex_bytes.cc:11< / a > < / div > < / div >
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