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  1. /*
  2.  * ISO Media common code
  3.  * Copyright (c) 2001 Fabrice Bellard
  4.  * Copyright (c) 2002 Francois Revol <revol@free.fr>
  5.  * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22.  */
  23.  
  24. #include "avformat.h"
  25. #include "internal.h"
  26. #include "isom.h"
  27. #include "libavcodec/mpeg4audio.h"
  28. #include "libavcodec/mpegaudiodata.h"
  29.  
  30. /* http://www.mp4ra.org */
  31. /* ordered by muxing preference */
  32. const AVCodecTag ff_mp4_obj_type[] = {
  33.     { AV_CODEC_ID_MOV_TEXT    , 0x08 },
  34.     { AV_CODEC_ID_MPEG4       , 0x20 },
  35.     { AV_CODEC_ID_H264        , 0x21 },
  36.     { AV_CODEC_ID_AAC         , 0x40 },
  37.     { AV_CODEC_ID_MP4ALS      , 0x40 }, /* 14496-3 ALS */
  38.     { AV_CODEC_ID_MPEG2VIDEO  , 0x61 }, /* MPEG2 Main */
  39.     { AV_CODEC_ID_MPEG2VIDEO  , 0x60 }, /* MPEG2 Simple */
  40.     { AV_CODEC_ID_MPEG2VIDEO  , 0x62 }, /* MPEG2 SNR */
  41.     { AV_CODEC_ID_MPEG2VIDEO  , 0x63 }, /* MPEG2 Spatial */
  42.     { AV_CODEC_ID_MPEG2VIDEO  , 0x64 }, /* MPEG2 High */
  43.     { AV_CODEC_ID_MPEG2VIDEO  , 0x65 }, /* MPEG2 422 */
  44.     { AV_CODEC_ID_AAC         , 0x66 }, /* MPEG2 AAC Main */
  45.     { AV_CODEC_ID_AAC         , 0x67 }, /* MPEG2 AAC Low */
  46.     { AV_CODEC_ID_AAC         , 0x68 }, /* MPEG2 AAC SSR */
  47.     { AV_CODEC_ID_MP3         , 0x69 }, /* 13818-3 */
  48.     { AV_CODEC_ID_MP2         , 0x69 }, /* 11172-3 */
  49.     { AV_CODEC_ID_MPEG1VIDEO  , 0x6A }, /* 11172-2 */
  50.     { AV_CODEC_ID_MP3         , 0x6B }, /* 11172-3 */
  51.     { AV_CODEC_ID_MJPEG       , 0x6C }, /* 10918-1 */
  52.     { AV_CODEC_ID_PNG         , 0x6D },
  53.     { AV_CODEC_ID_JPEG2000    , 0x6E }, /* 15444-1 */
  54.     { AV_CODEC_ID_VC1         , 0xA3 },
  55.     { AV_CODEC_ID_DIRAC       , 0xA4 },
  56.     { AV_CODEC_ID_AC3         , 0xA5 },
  57.     { AV_CODEC_ID_DTS         , 0xA9 }, /* mp4ra.org */
  58.     { AV_CODEC_ID_VORBIS      , 0xDD }, /* non standard, gpac uses it */
  59.     { AV_CODEC_ID_DVD_SUBTITLE, 0xE0 }, /* non standard, see unsupported-embedded-subs-2.mp4 */
  60.     { AV_CODEC_ID_QCELP       , 0xE1 },
  61.     { AV_CODEC_ID_MPEG4SYSTEMS, 0x01 },
  62.     { AV_CODEC_ID_MPEG4SYSTEMS, 0x02 },
  63.     { AV_CODEC_ID_NONE        ,    0 },
  64. };
  65.  
  66. const AVCodecTag ff_codec_movvideo_tags[] = {
  67. /*  { AV_CODEC_ID_, MKTAG('I', 'V', '5', '0') }, *//* Indeo 5.0 */
  68.  
  69.     { AV_CODEC_ID_RAWVIDEO, MKTAG('r', 'a', 'w', ' ') }, /* Uncompressed RGB */
  70.     { AV_CODEC_ID_RAWVIDEO, MKTAG('y', 'u', 'v', '2') }, /* Uncompressed YUV422 */
  71.     { AV_CODEC_ID_RAWVIDEO, MKTAG('2', 'v', 'u', 'y') }, /* UNCOMPRESSED 8BIT 4:2:2 */
  72.     { AV_CODEC_ID_RAWVIDEO, MKTAG('y', 'u', 'v', 's') }, /* same as 2vuy but byte swapped */
  73.  
  74.     { AV_CODEC_ID_RAWVIDEO, MKTAG('L', '5', '5', '5') },
  75.     { AV_CODEC_ID_RAWVIDEO, MKTAG('L', '5', '6', '5') },
  76.     { AV_CODEC_ID_RAWVIDEO, MKTAG('B', '5', '6', '5') },
  77.     { AV_CODEC_ID_RAWVIDEO, MKTAG('2', '4', 'B', 'G') },
  78.     { AV_CODEC_ID_RAWVIDEO, MKTAG('B', 'G', 'R', 'A') },
  79.     { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', 'A') },
  80.     { AV_CODEC_ID_RAWVIDEO, MKTAG('A', 'B', 'G', 'R') },
  81.     { AV_CODEC_ID_RAWVIDEO, MKTAG('b', '1', '6', 'g') },
  82.     { AV_CODEC_ID_RAWVIDEO, MKTAG('b', '4', '8', 'r') },
  83.     { AV_CODEC_ID_RAWVIDEO, MKTAG('b', 'x', 'b', 'g') },
  84.     { AV_CODEC_ID_RAWVIDEO, MKTAG('b', 'x', 'r', 'g') },
  85.     { AV_CODEC_ID_RAWVIDEO, MKTAG('b', 'x', 'y', 'v') },
  86.     { AV_CODEC_ID_RAWVIDEO, MKTAG('N', 'O', '1', '6') },
  87.     { AV_CODEC_ID_RAWVIDEO, MKTAG('D', 'V', 'O', 'O') }, /* Digital Voodoo SD 8 Bit */
  88.     { AV_CODEC_ID_RAWVIDEO, MKTAG('R', '4', '2', '0') }, /* Radius DV YUV PAL */
  89.     { AV_CODEC_ID_RAWVIDEO, MKTAG('R', '4', '1', '1') }, /* Radius DV YUV NTSC */
  90.  
  91.     { AV_CODEC_ID_R10K,   MKTAG('R', '1', '0', 'k') }, /* UNCOMPRESSED 10BIT RGB */
  92.     { AV_CODEC_ID_R10K,   MKTAG('R', '1', '0', 'g') }, /* UNCOMPRESSED 10BIT RGB */
  93.     { AV_CODEC_ID_R210,   MKTAG('r', '2', '1', '0') }, /* UNCOMPRESSED 10BIT RGB */
  94.     { AV_CODEC_ID_AVUI,   MKTAG('A', 'V', 'U', 'I') }, /* AVID Uncompressed deinterleaved UYVY422 */
  95.     { AV_CODEC_ID_AVRP,   MKTAG('A', 'V', 'r', 'p') }, /* Avid 1:1 10-bit RGB Packer */
  96.     { AV_CODEC_ID_AVRP,   MKTAG('S', 'U', 'D', 'S') }, /* Avid DS Uncompressed */
  97.     { AV_CODEC_ID_V210,   MKTAG('v', '2', '1', '0') }, /* UNCOMPRESSED 10BIT 4:2:2 */
  98.     { AV_CODEC_ID_V210,   MKTAG('b', 'x', 'y', '2') }, /* BOXX 10BIT 4:2:2 */
  99.     { AV_CODEC_ID_V308,   MKTAG('v', '3', '0', '8') }, /* UNCOMPRESSED  8BIT 4:4:4 */
  100.     { AV_CODEC_ID_V408,   MKTAG('v', '4', '0', '8') }, /* UNCOMPRESSED  8BIT 4:4:4:4 */
  101.     { AV_CODEC_ID_V410,   MKTAG('v', '4', '1', '0') }, /* UNCOMPRESSED 10BIT 4:4:4 */
  102.     { AV_CODEC_ID_Y41P,   MKTAG('Y', '4', '1', 'P') }, /* UNCOMPRESSED 12BIT 4:1:1 */
  103.     { AV_CODEC_ID_YUV4,   MKTAG('y', 'u', 'v', '4') }, /* libquicktime packed yuv420p */
  104.     { AV_CODEC_ID_TARGA_Y216, MKTAG('Y', '2', '1', '6') },
  105.  
  106.     { AV_CODEC_ID_MJPEG,  MKTAG('j', 'p', 'e', 'g') }, /* PhotoJPEG */
  107.     { AV_CODEC_ID_MJPEG,  MKTAG('m', 'j', 'p', 'a') }, /* Motion-JPEG (format A) */
  108.     { AV_CODEC_ID_MJPEG,  MKTAG('A', 'V', 'D', 'J') }, /* MJPEG with alpha-channel (AVID JFIF meridien compressed) */
  109. /*  { AV_CODEC_ID_MJPEG,  MKTAG('A', 'V', 'R', 'n') }, *//* MJPEG with alpha-channel (AVID ABVB/Truevision NuVista) */
  110.     { AV_CODEC_ID_MJPEG,  MKTAG('d', 'm', 'b', '1') }, /* Motion JPEG OpenDML */
  111.     { AV_CODEC_ID_MJPEGB, MKTAG('m', 'j', 'p', 'b') }, /* Motion-JPEG (format B) */
  112.  
  113.     { AV_CODEC_ID_SVQ1, MKTAG('S', 'V', 'Q', '1') }, /* Sorenson Video v1 */
  114.     { AV_CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') }, /* Sorenson Video v1 */
  115.     { AV_CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', 'i') }, /* Sorenson Video v1 (from QT specs)*/
  116.     { AV_CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') }, /* Sorenson Video v3 */
  117.  
  118.     { AV_CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
  119.     { AV_CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') }, /* OpenDiVX *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */
  120.     { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },
  121.     { AV_CODEC_ID_MPEG4, MKTAG('3', 'I', 'V', '2') }, /* experimental: 3IVX files before ivx D4 4.5.1 */
  122.  
  123.     { AV_CODEC_ID_H263, MKTAG('h', '2', '6', '3') }, /* H263 */
  124.     { AV_CODEC_ID_H263, MKTAG('s', '2', '6', '3') }, /* H263 ?? works */
  125.  
  126.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 'p') }, /* DV PAL */
  127.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') }, /* DV NTSC */
  128.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'p', 'p') }, /* DVCPRO PAL produced by FCP */
  129.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'p') }, /* DVCPRO50 PAL produced by FCP */
  130.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'n') }, /* DVCPRO50 NTSC produced by FCP */
  131.     { AV_CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, /* AVID DV */
  132.     { AV_CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', '1') }, /* AVID DV100 */
  133.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'q') }, /* DVCPRO HD 720p50 */
  134.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'p') }, /* DVCPRO HD 720p60 */
  135.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '1') },
  136.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '2') },
  137.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '4') },
  138.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '5') }, /* DVCPRO HD 50i produced by FCP */
  139.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '6') }, /* DVCPRO HD 60i produced by FCP */
  140.     { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '3') }, /* DVCPRO HD 30p produced by FCP */
  141.  
  142.     { AV_CODEC_ID_VP3,     MKTAG('V', 'P', '3', '1') }, /* On2 VP3 */
  143.     { AV_CODEC_ID_RPZA,    MKTAG('r', 'p', 'z', 'a') }, /* Apple Video (RPZA) */
  144.     { AV_CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') }, /* Cinepak */
  145.     { AV_CODEC_ID_8BPS,    MKTAG('8', 'B', 'P', 'S') }, /* Planar RGB (8BPS) */
  146.     { AV_CODEC_ID_SMC,     MKTAG('s', 'm', 'c', ' ') }, /* Apple Graphics (SMC) */
  147.     { AV_CODEC_ID_QTRLE,   MKTAG('r', 'l', 'e', ' ') }, /* Apple Animation (RLE) */
  148.     { AV_CODEC_ID_SGIRLE,  MKTAG('r', 'l', 'e', '1') }, /* SGI RLE 8-bit */
  149.     { AV_CODEC_ID_MSRLE,   MKTAG('W', 'R', 'L', 'E') },
  150.     { AV_CODEC_ID_QDRAW,   MKTAG('q', 'd', 'r', 'w') }, /* QuickDraw */
  151.  
  152.     { AV_CODEC_ID_RAWVIDEO, MKTAG('W', 'R', 'A', 'W') },
  153.  
  154.     { AV_CODEC_ID_HEVC, MKTAG('h', 'v', 'c', '1') }, /* HEVC/H.265 which indicates parameter sets shall not be in ES */
  155.     { AV_CODEC_ID_HEVC, MKTAG('h', 'e', 'v', '1') }, /* HEVC/H.265 which indicates parameter sets may be in ES */
  156.  
  157.     { AV_CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') }, /* AVC-1/H.264 */
  158.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '5', 'p') }, /* AVC-Intra  50M 720p24/30/60 */
  159.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '5', 'q') }, /* AVC-Intra  50M 720p25/50 */
  160.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '5', '2') }, /* AVC-Intra  50M 1080p25/50 */
  161.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '5', '3') }, /* AVC-Intra  50M 1080p24/30/60 */
  162.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '5', '5') }, /* AVC-Intra  50M 1080i50 */
  163.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '5', '6') }, /* AVC-Intra  50M 1080i60 */
  164.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '1', 'p') }, /* AVC-Intra 100M 720p24/30/60 */
  165.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '1', 'q') }, /* AVC-Intra 100M 720p25/50 */
  166.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '1', '2') }, /* AVC-Intra 100M 1080p25/50 */
  167.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '1', '3') }, /* AVC-Intra 100M 1080p24/30/60 */
  168.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '1', '5') }, /* AVC-Intra 100M 1080i50 */
  169.     { AV_CODEC_ID_H264, MKTAG('a', 'i', '1', '6') }, /* AVC-Intra 100M 1080i60 */
  170.     { AV_CODEC_ID_H264, MKTAG('a', 'i', 'v', 'x') }, /* XAVC 4:2:2 10bit */
  171.     { AV_CODEC_ID_H264, MKTAG('A', 'V', 'i', 'n') }, /* AVC-Intra with implicit SPS/PPS */
  172.  
  173.     { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', '1', 'v', '1') }, /* Apple MPEG-1 Camcorder */
  174.     { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'e', 'g') }, /* MPEG */
  175.     { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', '1', 'v', ' ') },
  176.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', '2', 'v', '1') }, /* Apple MPEG-2 Camcorder */
  177.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '1') }, /* MPEG2 HDV 720p30 */
  178.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '2') }, /* MPEG2 HDV 1080i60 */
  179.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '3') }, /* MPEG2 HDV 1080i50 */
  180.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '4') }, /* MPEG2 HDV 720p24 */
  181.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '5') }, /* MPEG2 HDV 720p25 */
  182.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '6') }, /* MPEG2 HDV 1080p24 */
  183.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '7') }, /* MPEG2 HDV 1080p25 */
  184.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '8') }, /* MPEG2 HDV 1080p30 */
  185.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '9') }, /* MPEG2 HDV 720p60 JVC */
  186.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', 'a') }, /* MPEG2 HDV 720p50 */
  187.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '5', 'n') }, /* MPEG2 IMX NTSC 525/60 50mb/s produced by FCP */
  188.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '5', 'p') }, /* MPEG2 IMX PAL 625/50 50mb/s produced by FCP */
  189.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '4', 'n') }, /* MPEG2 IMX NTSC 525/60 40mb/s produced by FCP */
  190.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '4', 'p') }, /* MPEG2 IMX PAL 625/50 40mb/s produced by FCP */
  191.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '3', 'n') }, /* MPEG2 IMX NTSC 525/60 30mb/s produced by FCP */
  192.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '3', 'p') }, /* MPEG2 IMX PAL 625/50 30mb/s produced by FCP */
  193.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', '1') }, /* XDCAM HD422 720p30 CBR */
  194.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', '4') }, /* XDCAM HD422 720p24 CBR */
  195.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', '5') }, /* XDCAM HD422 720p25 CBR */
  196.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', '9') }, /* XDCAM HD422 720p60 CBR */
  197.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'a') }, /* XDCAM HD422 720p50 CBR */
  198.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'b') }, /* XDCAM HD422 1080i60 CBR */
  199.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'c') }, /* XDCAM HD422 1080i50 CBR */
  200.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'd') }, /* XDCAM HD422 1080p24 CBR */
  201.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'e') }, /* XDCAM HD422 1080p25 CBR */
  202.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'f') }, /* XDCAM HD422 1080p30 CBR */
  203.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '1') }, /* XDCAM EX 720p30 VBR */
  204.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '2') }, /* XDCAM HD 1080i60 */
  205.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '3') }, /* XDCAM HD 1080i50 VBR */
  206.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '4') }, /* XDCAM EX 720p24 VBR */
  207.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '5') }, /* XDCAM EX 720p25 VBR */
  208.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '6') }, /* XDCAM HD 1080p24 VBR */
  209.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '7') }, /* XDCAM HD 1080p25 VBR */
  210.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '8') }, /* XDCAM HD 1080p30 VBR */
  211.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '9') }, /* XDCAM EX 720p60 VBR */
  212.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'a') }, /* XDCAM EX 720p50 VBR */
  213.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'b') }, /* XDCAM EX 1080i60 VBR */
  214.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'c') }, /* XDCAM EX 1080i50 VBR */
  215.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'd') }, /* XDCAM EX 1080p24 VBR */
  216.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'e') }, /* XDCAM EX 1080p25 VBR */
  217.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'f') }, /* XDCAM EX 1080p30 VBR */
  218.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'h', 'd') }, /* XDCAM HD 540p */
  219.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'h', '2') }, /* XDCAM HD422 540p */
  220.     { AV_CODEC_ID_MPEG2VIDEO, MKTAG('A', 'V', 'm', 'p') }, /* AVID IMX PAL */
  221.  
  222.     { AV_CODEC_ID_JPEG2000, MKTAG('m', 'j', 'p', '2') }, /* JPEG 2000 produced by FCP */
  223.  
  224.     { AV_CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') }, /* Truevision Targa */
  225.     { AV_CODEC_ID_TIFF,  MKTAG('t', 'i', 'f', 'f') }, /* TIFF embedded in MOV */
  226.     { AV_CODEC_ID_GIF,   MKTAG('g', 'i', 'f', ' ') }, /* embedded gif files as frames (usually one "click to play movie" frame) */
  227.     { AV_CODEC_ID_PNG,   MKTAG('p', 'n', 'g', ' ') },
  228.     { AV_CODEC_ID_PNG,   MKTAG('M', 'N', 'G', ' ') },
  229.  
  230.     { AV_CODEC_ID_VC1, MKTAG('v', 'c', '-', '1') }, /* SMPTE RP 2025 */
  231.     { AV_CODEC_ID_CAVS, MKTAG('a', 'v', 's', '2') },
  232.  
  233.     { AV_CODEC_ID_DIRAC,     MKTAG('d', 'r', 'a', 'c') },
  234.     { AV_CODEC_ID_DNXHD,     MKTAG('A', 'V', 'd', 'n') }, /* AVID DNxHD */
  235.     { AV_CODEC_ID_H263,      MKTAG('H', '2', '6', '3') },
  236.     { AV_CODEC_ID_MSMPEG4V3, MKTAG('3', 'I', 'V', 'D') }, /* 3ivx DivX Doctor */
  237.     { AV_CODEC_ID_RAWVIDEO,  MKTAG('A', 'V', '1', 'x') }, /* AVID 1:1x */
  238.     { AV_CODEC_ID_RAWVIDEO,  MKTAG('A', 'V', 'u', 'p') },
  239.     { AV_CODEC_ID_SGI,       MKTAG('s', 'g', 'i', ' ') }, /* SGI  */
  240.     { AV_CODEC_ID_DPX,       MKTAG('d', 'p', 'x', ' ') }, /* DPX */
  241.     { AV_CODEC_ID_EXR,       MKTAG('e', 'x', 'r', ' ') }, /* OpenEXR */
  242.  
  243.     { AV_CODEC_ID_PRORES, MKTAG('a', 'p', 'c', 'h') }, /* Apple ProRes 422 High Quality */
  244.     { AV_CODEC_ID_PRORES, MKTAG('a', 'p', 'c', 'n') }, /* Apple ProRes 422 Standard Definition */
  245.     { AV_CODEC_ID_PRORES, MKTAG('a', 'p', 'c', 's') }, /* Apple ProRes 422 LT */
  246.     { AV_CODEC_ID_PRORES, MKTAG('a', 'p', 'c', 'o') }, /* Apple ProRes 422 Proxy */
  247.     { AV_CODEC_ID_PRORES, MKTAG('a', 'p', '4', 'h') }, /* Apple ProRes 4444 */
  248.     { AV_CODEC_ID_FLIC,   MKTAG('f', 'l', 'i', 'c') },
  249.  
  250.     { AV_CODEC_ID_AIC, MKTAG('i', 'c', 'o', 'd') },
  251.  
  252.     { AV_CODEC_ID_NONE, 0 },
  253. };
  254.  
  255. const AVCodecTag ff_codec_movaudio_tags[] = {
  256.     { AV_CODEC_ID_AAC,             MKTAG('m', 'p', '4', 'a') },
  257.     { AV_CODEC_ID_AC3,             MKTAG('a', 'c', '-', '3') }, /* ETSI TS 102 366 Annex F */
  258.     { AV_CODEC_ID_AC3,             MKTAG('s', 'a', 'c', '3') }, /* Nero Recode */
  259.     { AV_CODEC_ID_ADPCM_IMA_QT,    MKTAG('i', 'm', 'a', '4') },
  260.     { AV_CODEC_ID_ALAC,            MKTAG('a', 'l', 'a', 'c') },
  261.     { AV_CODEC_ID_AMR_NB,          MKTAG('s', 'a', 'm', 'r') }, /* AMR-NB 3gp */
  262.     { AV_CODEC_ID_AMR_WB,          MKTAG('s', 'a', 'w', 'b') }, /* AMR-WB 3gp */
  263.     { AV_CODEC_ID_DTS,             MKTAG('d', 't', 's', 'c') }, /* DTS formats prior to DTS-HD */
  264.     { AV_CODEC_ID_DTS,             MKTAG('d', 't', 's', 'h') }, /* DTS-HD audio formats */
  265.     { AV_CODEC_ID_DTS,             MKTAG('d', 't', 's', 'l') }, /* DTS-HD Lossless formats */
  266.     { AV_CODEC_ID_DTS,             MKTAG('D', 'T', 'S', ' ') }, /* non-standard */
  267.     { AV_CODEC_ID_EAC3,            MKTAG('e', 'c', '-', '3') }, /* ETSI TS 102 366 Annex F (only valid in ISOBMFF) */
  268.     { AV_CODEC_ID_DVAUDIO,         MKTAG('v', 'd', 'v', 'a') },
  269.     { AV_CODEC_ID_DVAUDIO,         MKTAG('d', 'v', 'c', 'a') },
  270.     { AV_CODEC_ID_GSM,             MKTAG('a', 'g', 's', 'm') },
  271.     { AV_CODEC_ID_ILBC,            MKTAG('i', 'l', 'b', 'c') },
  272.     { AV_CODEC_ID_MACE3,           MKTAG('M', 'A', 'C', '3') },
  273.     { AV_CODEC_ID_MACE6,           MKTAG('M', 'A', 'C', '6') },
  274.     { AV_CODEC_ID_MP1,             MKTAG('.', 'm', 'p', '1') },
  275.     { AV_CODEC_ID_MP2,             MKTAG('.', 'm', 'p', '2') },
  276.     { AV_CODEC_ID_MP3,             MKTAG('.', 'm', 'p', '3') },
  277.     { AV_CODEC_ID_MP3,             0x6D730055                },
  278.     { AV_CODEC_ID_NELLYMOSER,      MKTAG('n', 'm', 'o', 's') }, /* Flash Media Server */
  279.     { AV_CODEC_ID_PCM_ALAW,        MKTAG('a', 'l', 'a', 'w') },
  280.     { AV_CODEC_ID_PCM_F32BE,       MKTAG('f', 'l', '3', '2') },
  281.     { AV_CODEC_ID_PCM_F32LE,       MKTAG('f', 'l', '3', '2') },
  282.     { AV_CODEC_ID_PCM_F64BE,       MKTAG('f', 'l', '6', '4') },
  283.     { AV_CODEC_ID_PCM_F64LE,       MKTAG('f', 'l', '6', '4') },
  284.     { AV_CODEC_ID_PCM_MULAW,       MKTAG('u', 'l', 'a', 'w') },
  285.     { AV_CODEC_ID_PCM_S16BE,       MKTAG('t', 'w', 'o', 's') },
  286.     { AV_CODEC_ID_PCM_S16LE,       MKTAG('s', 'o', 'w', 't') },
  287.     { AV_CODEC_ID_PCM_S16LE,       MKTAG('l', 'p', 'c', 'm') },
  288.     { AV_CODEC_ID_PCM_S24BE,       MKTAG('i', 'n', '2', '4') },
  289.     { AV_CODEC_ID_PCM_S24LE,       MKTAG('i', 'n', '2', '4') },
  290.     { AV_CODEC_ID_PCM_S32BE,       MKTAG('i', 'n', '3', '2') },
  291.     { AV_CODEC_ID_PCM_S32LE,       MKTAG('i', 'n', '3', '2') },
  292.     { AV_CODEC_ID_PCM_S8,          MKTAG('s', 'o', 'w', 't') },
  293.     { AV_CODEC_ID_PCM_U8,          MKTAG('r', 'a', 'w', ' ') },
  294.     { AV_CODEC_ID_PCM_U8,          MKTAG('N', 'O', 'N', 'E') },
  295.     { AV_CODEC_ID_QCELP,           MKTAG('Q', 'c', 'l', 'p') },
  296.     { AV_CODEC_ID_QCELP,           MKTAG('Q', 'c', 'l', 'q') },
  297.     { AV_CODEC_ID_QCELP,           MKTAG('s', 'q', 'c', 'p') }, /* ISO Media fourcc */
  298.     { AV_CODEC_ID_QDM2,            MKTAG('Q', 'D', 'M', '2') },
  299.     { AV_CODEC_ID_QDMC,            MKTAG('Q', 'D', 'M', 'C') },
  300.     { AV_CODEC_ID_SPEEX,           MKTAG('s', 'p', 'e', 'x') }, /* Flash Media Server */
  301.     { AV_CODEC_ID_SPEEX,           MKTAG('S', 'P', 'X', 'N') },
  302.     { AV_CODEC_ID_WMAV2,           MKTAG('W', 'M', 'A', '2') },
  303.     { AV_CODEC_ID_EVRC,            MKTAG('s', 'e', 'v', 'c') }, /* 3GPP2 */
  304.     { AV_CODEC_ID_SMV,             MKTAG('s', 's', 'm', 'v') }, /* 3GPP2 */
  305.     { AV_CODEC_ID_NONE, 0 },
  306. };
  307.  
  308. const AVCodecTag ff_codec_movsubtitle_tags[] = {
  309.     { AV_CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') },
  310.     { AV_CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') },
  311.     { AV_CODEC_ID_EIA_608,  MKTAG('c', '6', '0', '8') },
  312.     { AV_CODEC_ID_NONE, 0 },
  313. };
  314.  
  315. /* map numeric codes from mdhd atom to ISO 639 */
  316. /* cf. QTFileFormat.pdf p253, qtff.pdf p205 */
  317. /* http://developer.apple.com/documentation/mac/Text/Text-368.html */
  318. /* deprecated by putting the code as 3*5bit ascii */
  319. static const char mov_mdhd_language_map[][4] = {
  320.     /* 0-9 */
  321.     "eng", "fra", "ger", "ita", "dut", "sve", "spa", "dan", "por", "nor",
  322.     "heb", "jpn", "ara", "fin", "gre", "ice", "mlt", "tur", "hr "/*scr*/, "chi"/*ace?*/,
  323.     "urd", "hin", "tha", "kor", "lit", "pol", "hun", "est", "lav",    "",
  324.     "fo ",    "", "rus", "chi",    "", "iri", "alb", "ron", "ces", "slk",
  325.     "slv", "yid", "sr ", "mac", "bul", "ukr", "bel", "uzb", "kaz", "aze",
  326.     /*?*/
  327.     "aze", "arm", "geo", "mol", "kir", "tgk", "tuk", "mon",    "", "pus",
  328.     "kur", "kas", "snd", "tib", "nep", "san", "mar", "ben", "asm", "guj",
  329.     "pa ", "ori", "mal", "kan", "tam", "tel",    "", "bur", "khm", "lao",
  330.     /*                   roman? arabic? */
  331.     "vie", "ind", "tgl", "may", "may", "amh", "tir", "orm", "som", "swa",
  332.     /*==rundi?*/
  333.        "", "run",    "", "mlg", "epo",    "",    "",    "",    "",    "",
  334.     /* 100 */
  335.        "",    "",    "",    "",    "",    "",    "",    "",    "",    "",
  336.        "",    "",    "",    "",    "",    "",    "",    "",    "",    "",
  337.        "",    "",    "",    "",    "",    "",    "",    "", "wel", "baq",
  338.     "cat", "lat", "que", "grn", "aym", "tat", "uig", "dzo", "jav"
  339. };
  340.  
  341. int ff_mov_iso639_to_lang(const char lang[4], int mp4)
  342. {
  343.     int i, code = 0;
  344.  
  345.     /* old way, only for QT? */
  346.     for (i = 0; lang[0] && !mp4 && i < FF_ARRAY_ELEMS(mov_mdhd_language_map); i++) {
  347.         if (!strcmp(lang, mov_mdhd_language_map[i]))
  348.             return i;
  349.     }
  350.     /* XXX:can we do that in mov too? */
  351.     if (!mp4)
  352.         return -1;
  353.     /* handle undefined as such */
  354.     if (lang[0] == '\0')
  355.         lang = "und";
  356.     /* 5bit ascii */
  357.     for (i = 0; i < 3; i++) {
  358.         uint8_t c = lang[i];
  359.         c -= 0x60;
  360.         if (c > 0x1f)
  361.             return -1;
  362.         code <<= 5;
  363.         code |= c;
  364.     }
  365.     return code;
  366. }
  367.  
  368. int ff_mov_lang_to_iso639(unsigned code, char to[4])
  369. {
  370.     int i;
  371.     memset(to, 0, 4);
  372.     /* is it the mangled iso code? */
  373.     /* see http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt */
  374.     if (code >= 0x400 && code != 0x7fff) {
  375.         for (i = 2; i >= 0; i--) {
  376.             to[i] = 0x60 + (code & 0x1f);
  377.             code >>= 5;
  378.         }
  379.         return 1;
  380.     }
  381.     /* old fashion apple lang code */
  382.     if (code >= FF_ARRAY_ELEMS(mov_mdhd_language_map))
  383.         return 0;
  384.     if (!mov_mdhd_language_map[code][0])
  385.         return 0;
  386.     memcpy(to, mov_mdhd_language_map[code], 4);
  387.     return 1;
  388. }
  389.  
  390. int ff_mp4_read_descr_len(AVIOContext *pb)
  391. {
  392.     int len = 0;
  393.     int count = 4;
  394.     while (count--) {
  395.         int c = avio_r8(pb);
  396.         len = (len << 7) | (c & 0x7f);
  397.         if (!(c & 0x80))
  398.             break;
  399.     }
  400.     return len;
  401. }
  402.  
  403. int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
  404. {
  405.     int len;
  406.     *tag = avio_r8(pb);
  407.     len = ff_mp4_read_descr_len(pb);
  408.     av_dlog(fc, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len);
  409.     return len;
  410. }
  411.  
  412. void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
  413. {
  414.      int flags;
  415.      if (es_id) *es_id = avio_rb16(pb);
  416.      else                avio_rb16(pb);
  417.      flags = avio_r8(pb);
  418.      if (flags & 0x80) //streamDependenceFlag
  419.          avio_rb16(pb);
  420.      if (flags & 0x40) { //URL_Flag
  421.          int len = avio_r8(pb);
  422.          avio_skip(pb, len);
  423.      }
  424.      if (flags & 0x20) //OCRstreamFlag
  425.          avio_rb16(pb);
  426. }
  427.  
  428. static const AVCodecTag mp4_audio_types[] = {
  429.     { AV_CODEC_ID_MP3ON4, AOT_PS   }, /* old mp3on4 draft */
  430.     { AV_CODEC_ID_MP3ON4, AOT_L1   }, /* layer 1 */
  431.     { AV_CODEC_ID_MP3ON4, AOT_L2   }, /* layer 2 */
  432.     { AV_CODEC_ID_MP3ON4, AOT_L3   }, /* layer 3 */
  433.     { AV_CODEC_ID_MP4ALS, AOT_ALS  }, /* MPEG-4 ALS */
  434.     { AV_CODEC_ID_NONE,   AOT_NULL },
  435. };
  436.  
  437. int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb)
  438. {
  439.     int len, tag;
  440.     int object_type_id = avio_r8(pb);
  441.     avio_r8(pb); /* stream type */
  442.     avio_rb24(pb); /* buffer size db */
  443.     avio_rb32(pb); /* max bitrate */
  444.     avio_rb32(pb); /* avg bitrate */
  445.  
  446.     if(avcodec_is_open(st->codec)) {
  447.         av_log(fc, AV_LOG_DEBUG, "codec open in read_dec_config_descr\n");
  448.         return -1;
  449.     }
  450.  
  451.     st->codec->codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id);
  452.     av_dlog(fc, "esds object type id 0x%02x\n", object_type_id);
  453.     len = ff_mp4_read_descr(fc, pb, &tag);
  454.     if (tag == MP4DecSpecificDescrTag) {
  455.         av_dlog(fc, "Specific MPEG4 header len=%d\n", len);
  456.         if (!len || (uint64_t)len > (1<<30))
  457.             return -1;
  458.         av_free(st->codec->extradata);
  459.         if (ff_alloc_extradata(st->codec, len))
  460.             return AVERROR(ENOMEM);
  461.         avio_read(pb, st->codec->extradata, len);
  462.         if (st->codec->codec_id == AV_CODEC_ID_AAC) {
  463.             MPEG4AudioConfig cfg;
  464.             avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
  465.                                          st->codec->extradata_size * 8, 1);
  466.             st->codec->channels = cfg.channels;
  467.             if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
  468.                 st->codec->sample_rate = avpriv_mpa_freq_tab[cfg.sampling_index];
  469.             else if (cfg.ext_sample_rate)
  470.                 st->codec->sample_rate = cfg.ext_sample_rate;
  471.             else
  472.                 st->codec->sample_rate = cfg.sample_rate;
  473.             av_dlog(fc, "mp4a config channels %d obj %d ext obj %d "
  474.                     "sample rate %d ext sample rate %d\n", st->codec->channels,
  475.                     cfg.object_type, cfg.ext_object_type,
  476.                     cfg.sample_rate, cfg.ext_sample_rate);
  477.             if (!(st->codec->codec_id = ff_codec_get_id(mp4_audio_types,
  478.                                                         cfg.object_type)))
  479.                 st->codec->codec_id = AV_CODEC_ID_AAC;
  480.         }
  481.     }
  482.     return 0;
  483. }
  484.  
  485. typedef struct MovChannelLayout {
  486.     int64_t  channel_layout;
  487.     uint32_t layout_tag;
  488. } MovChannelLayout;
  489.  
  490. static const MovChannelLayout mov_channel_layout[] = {
  491.     { AV_CH_LAYOUT_MONO,                         (100<<16) | 1}, // kCAFChannelLayoutTag_Mono
  492.     { AV_CH_LAYOUT_STEREO,                       (101<<16) | 2}, // kCAFChannelLayoutTag_Stereo
  493.     { AV_CH_LAYOUT_STEREO,                       (102<<16) | 2}, // kCAFChannelLayoutTag_StereoHeadphones
  494.     { AV_CH_LAYOUT_2_1,                          (131<<16) | 3}, // kCAFChannelLayoutTag_ITU_2_1
  495.     { AV_CH_LAYOUT_QUAD,                         (132<<16) | 4}, // kCAFChannelLayoutTag_ITU_2_2
  496.     { AV_CH_LAYOUT_2_2,                          (132<<16) | 4}, // kCAFChannelLayoutTag_ITU_2_2
  497.     { AV_CH_LAYOUT_QUAD,                         (108<<16) | 4}, // kCAFChannelLayoutTag_Quadraphonic
  498.     { AV_CH_LAYOUT_SURROUND,                     (113<<16) | 3}, // kCAFChannelLayoutTag_MPEG_3_0_A
  499.     { AV_CH_LAYOUT_4POINT0,                      (115<<16) | 4}, // kCAFChannelLayoutTag_MPEG_4_0_A
  500.     { AV_CH_LAYOUT_5POINT0_BACK,                 (117<<16) | 5}, // kCAFChannelLayoutTag_MPEG_5_0_A
  501.     { AV_CH_LAYOUT_5POINT0,                      (117<<16) | 5}, // kCAFChannelLayoutTag_MPEG_5_0_A
  502.     { AV_CH_LAYOUT_5POINT1_BACK,                 (121<<16) | 6}, // kCAFChannelLayoutTag_MPEG_5_1_A
  503.     { AV_CH_LAYOUT_5POINT1,                      (121<<16) | 6}, // kCAFChannelLayoutTag_MPEG_5_1_A
  504.     { AV_CH_LAYOUT_7POINT1,                      (128<<16) | 8}, // kCAFChannelLayoutTag_MPEG_7_1_C
  505.     { AV_CH_LAYOUT_7POINT1_WIDE,                 (126<<16) | 8}, // kCAFChannelLayoutTag_MPEG_7_1_A
  506.     { AV_CH_LAYOUT_5POINT1_BACK|AV_CH_LAYOUT_STEREO_DOWNMIX, (130<<16) | 8}, // kCAFChannelLayoutTag_SMPTE_DTV
  507.     { AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,   (133<<16) | 3}, // kCAFChannelLayoutTag_DVD_4
  508.     { AV_CH_LAYOUT_2_1|AV_CH_LOW_FREQUENCY,      (134<<16) | 4}, // kCAFChannelLayoutTag_DVD_5
  509.     { AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY,     (135<<16) | 4}, // kCAFChannelLayoutTag_DVD_6
  510.     { AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY,      (135<<16) | 4}, // kCAFChannelLayoutTag_DVD_6
  511.     { AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY, (136<<16) | 4}, // kCAFChannelLayoutTag_DVD_10
  512.     { AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY,  (137<<16) | 5}, // kCAFChannelLayoutTag_DVD_11
  513.     { 0, 0},
  514. };
  515. #if 0
  516. int ff_mov_read_chan(AVFormatContext *s, AVStream *st, int64_t size)
  517. {
  518.     AVCodecContext *codec= st->codec;
  519.     uint32_t layout_tag;
  520.     AVIOContext *pb = s->pb;
  521.     const MovChannelLayout *layouts = mov_channel_layout;
  522.  
  523.     if (size < 12)
  524.         return AVERROR_INVALIDDATA;
  525.  
  526.     layout_tag = avio_rb32(pb);
  527.     size -= 4;
  528.     if (layout_tag == 0) { // kCAFChannelLayoutTag_UseChannelDescriptions
  529.         // Channel descriptions not implemented
  530.         av_log_ask_for_sample(s, "Unimplemented container channel layout.\n");
  531.         avio_skip(pb, size);
  532.         return 0;
  533.     }
  534.     if (layout_tag == 0x10000) { // kCAFChannelLayoutTag_UseChannelBitmap
  535.         codec->channel_layout = avio_rb32(pb);
  536.         size -= 4;
  537.         avio_skip(pb, size);
  538.         return 0;
  539.     }
  540.     while (layouts->channel_layout) {
  541.         if (layout_tag == layouts->layout_tag) {
  542.             codec->channel_layout = layouts->channel_layout;
  543.             break;
  544.         }
  545.         layouts++;
  546.     }
  547.     if (!codec->channel_layout)
  548.         av_log(s, AV_LOG_WARNING, "Unknown container channel layout.\n");
  549.     avio_skip(pb, size);
  550.  
  551.     return 0;
  552. }
  553. #endif
  554.  
  555. void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout)
  556. {
  557.     const MovChannelLayout *layouts;
  558.     uint32_t layout_tag = 0;
  559.  
  560.     for (layouts = mov_channel_layout; layouts->channel_layout; layouts++)
  561.         if (channel_layout == layouts->channel_layout) {
  562.             layout_tag = layouts->layout_tag;
  563.             break;
  564.         }
  565.  
  566.     if (layout_tag) {
  567.         avio_wb32(pb, layout_tag); // mChannelLayoutTag
  568.         avio_wb32(pb, 0);          // mChannelBitmap
  569.     } else {
  570.         avio_wb32(pb, 0x10000);    // kCAFChannelLayoutTag_UseChannelBitmap
  571.         avio_wb32(pb, channel_layout);
  572.     }
  573.     avio_wb32(pb, 0);              // mNumberChannelDescriptions
  574. }
  575.  
  576.