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FFmpeg/libavformat/riff.c

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  1. /*

  2.  * RIFF codec tags

  3.  * Copyright (c) 2000 Fabrice Bellard

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "libavutil/mathematics.h"

  23. #include "libavcodec/avcodec.h"

  24. #include "avformat.h"

  25. #include "avio_internal.h"

  26. #include "riff.h"

  27. #include "libavcodec/bytestream.h"

  28. 

  29. /* Note: when encoding, the first matching tag is used, so order is

  30.    important if multiple tags possible for a given codec. */

  31. const AVCodecTag ff_codec_bmp_tags[] = {

  32.     { CODEC_ID_H264,         MKTAG('H', '2', '6', '4') },

  33.     { CODEC_ID_H264,         MKTAG('h', '2', '6', '4') },

  34.     { CODEC_ID_H264,         MKTAG('X', '2', '6', '4') },

  35.     { CODEC_ID_H264,         MKTAG('x', '2', '6', '4') },

  36.     { CODEC_ID_H264,         MKTAG('a', 'v', 'c', '1') },

  37.     { CODEC_ID_H264,         MKTAG('D', 'A', 'V', 'C') },

  38.     { CODEC_ID_H264,         MKTAG('V', 'S', 'S', 'H') },

  39.     { CODEC_ID_H263,         MKTAG('H', '2', '6', '3') },

  40.     { CODEC_ID_H263,         MKTAG('X', '2', '6', '3') },

  41.     { CODEC_ID_H263,         MKTAG('T', '2', '6', '3') },

  42.     { CODEC_ID_H263,         MKTAG('L', '2', '6', '3') },

  43.     { CODEC_ID_H263,         MKTAG('V', 'X', '1', 'K') },

  44.     { CODEC_ID_H263,         MKTAG('Z', 'y', 'G', 'o') },

  45.     { CODEC_ID_H263,         MKTAG('M', '2', '6', '3') },

  46.     { CODEC_ID_H263P,        MKTAG('H', '2', '6', '3') },

  47.     { CODEC_ID_H263I,        MKTAG('I', '2', '6', '3') }, /* intel h263 */

  48.     { CODEC_ID_H261,         MKTAG('H', '2', '6', '1') },

  49.     { CODEC_ID_H263P,        MKTAG('U', '2', '6', '3') },

  50.     { CODEC_ID_H263P,        MKTAG('v', 'i', 'v', '1') },

  51.     { CODEC_ID_MPEG4,        MKTAG('F', 'M', 'P', '4') },

  52.     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', 'X') },

  53.     { CODEC_ID_MPEG4,        MKTAG('D', 'X', '5', '0') },

  54.     { CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'D') },

  55.     { CODEC_ID_MPEG4,        MKTAG('M', 'P', '4', 'S') },

  56.     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'S', '2') },

  57.     { CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  0 ) }, /* some broken avi use this */

  58.     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'V', '1') },

  59.     { CODEC_ID_MPEG4,        MKTAG('B', 'L', 'Z', '0') },

  60.     { CODEC_ID_MPEG4,        MKTAG('m', 'p', '4', 'v') },

  61.     { CODEC_ID_MPEG4,        MKTAG('U', 'M', 'P', '4') },

  62.     { CODEC_ID_MPEG4,        MKTAG('W', 'V', '1', 'F') },

  63.     { CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },

  64.     { CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },

  65.     { CODEC_ID_MPEG4,        MKTAG('3', 'I', 'V', '2') },

  66.     { CODEC_ID_MPEG4,        MKTAG('W', 'A', 'W', 'V') }, /* WaWv MPEG-4 Video Codec */

  67.     { CODEC_ID_MPEG4,        MKTAG('F', 'F', 'D', 'S') },

  68.     { CODEC_ID_MPEG4,        MKTAG('F', 'V', 'F', 'W') },

  69.     { CODEC_ID_MPEG4,        MKTAG('D', 'C', 'O', 'D') },

  70.     { CODEC_ID_MPEG4,        MKTAG('M', 'V', 'X', 'M') },

  71.     { CODEC_ID_MPEG4,        MKTAG('P', 'M', '4', 'V') },

  72.     { CODEC_ID_MPEG4,        MKTAG('S', 'M', 'P', '4') },

  73.     { CODEC_ID_MPEG4,        MKTAG('D', 'X', 'G', 'M') },

  74.     { CODEC_ID_MPEG4,        MKTAG('V', 'I', 'D', 'M') },

  75.     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'T', '3') },

  76.     { CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'X') },

  77.     { CODEC_ID_MPEG4,        MKTAG('H', 'D', 'X', '4') }, /* flipped video */

  78.     { CODEC_ID_MPEG4,        MKTAG('D', 'M', 'K', '2') },

  79.     { CODEC_ID_MPEG4,        MKTAG('D', 'I', 'G', 'I') },

  80.     { CODEC_ID_MPEG4,        MKTAG('I', 'N', 'M', 'C') },

  81.     { CODEC_ID_MPEG4,        MKTAG('E', 'P', 'H', 'V') }, /* Ephv MPEG-4 */

  82.     { CODEC_ID_MPEG4,        MKTAG('E', 'M', '4', 'A') },

  83.     { CODEC_ID_MPEG4,        MKTAG('M', '4', 'C', 'C') }, /* Divio MPEG-4 */

  84.     { CODEC_ID_MPEG4,        MKTAG('S', 'N', '4', '0') },

  85.     { CODEC_ID_MPEG4,        MKTAG('V', 'S', 'P', 'X') },

  86.     { CODEC_ID_MPEG4,        MKTAG('U', 'L', 'D', 'X') },

  87.     { CODEC_ID_MPEG4,        MKTAG('G', 'E', 'O', 'V') },

  88.     { CODEC_ID_MPEG4,        MKTAG('S', 'I', 'P', 'P') }, /* Samsung SHR-6040 */

  89.     { CODEC_ID_MPEG4,        MKTAG('X', 'V', 'I', 'X') },

  90.     { CODEC_ID_MPEG4,        MKTAG('D', 'r', 'e', 'X') },

  91.     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },

  92.     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') },

  93.     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },

  94.     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '5') },

  95.     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '6') },

  96.     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '4') },

  97.     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'V', 'X', '3') },

  98.     { CODEC_ID_MSMPEG4V3,    MKTAG('A', 'P', '4', '1') },

  99.     { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '1') },

  100.     { CODEC_ID_MSMPEG4V3,    MKTAG('C', 'O', 'L', '0') },

  101.     { CODEC_ID_MSMPEG4V2,    MKTAG('M', 'P', '4', '2') },

  102.     { CODEC_ID_MSMPEG4V2,    MKTAG('D', 'I', 'V', '2') },

  103.     { CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', 'G', '4') },

  104.     { CODEC_ID_MSMPEG4V1,    MKTAG('M', 'P', '4', '1') },

  105.     { CODEC_ID_WMV1,         MKTAG('W', 'M', 'V', '1') },

  106.     { CODEC_ID_WMV2,         MKTAG('W', 'M', 'V', '2') },

  107.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'd') },

  108.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', 'd') },

  109.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },

  110.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 's', 'l') },

  111.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '2', '5') },

  112.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', '5', '0') },

  113.     { CODEC_ID_DVVIDEO,      MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */

  114.     { CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', 'H') }, /* Canopus DV */

  115.     { CODEC_ID_DVVIDEO,      MKTAG('C', 'D', 'V', '5') }, /* Canopus DV */

  116.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', ' ') },

  117.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'c', 's') },

  118.     { CODEC_ID_DVVIDEO,      MKTAG('d', 'v', 'h', '1') },

  119.     { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '1') },

  120.     { CODEC_ID_MPEG1VIDEO,   MKTAG('m', 'p', 'g', '2') },

  121.     { CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', '2') },

  122.     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },

  123.     { CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },

  124.     { CODEC_ID_MPEG2VIDEO,   MKTAG('P', 'I', 'M', '2') },

  125.     { CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },

  126.     { CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },

  127.     { CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },

  128.     { CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  16) },

  129.     { CODEC_ID_MPEG2VIDEO,   MKTAG('D', 'V', 'R', ' ') },

  130.     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'M', 'E', 'S') },

  131.     { CODEC_ID_MPEG2VIDEO,   MKTAG('L', 'M', 'P', '2') }, /* Lead MPEG2 in avi */

  132.     { CODEC_ID_MPEG2VIDEO,   MKTAG('s', 'l', 'i', 'f') },

  133.     { CODEC_ID_MPEG2VIDEO,   MKTAG('E', 'M', '2', 'V') },

  134.     { CODEC_ID_MPEG2VIDEO,   MKTAG('M', '7', '0', '1') }, /* Matrox MPEG2 intra-only */

  135.     { CODEC_ID_MPEG2VIDEO,   MKTAG('m', 'p', 'g', 'v') },

  136.     { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'P', 'G') },

  137.     { CODEC_ID_MJPEG,        MKTAG('L', 'J', 'P', 'G') },

  138.     { CODEC_ID_MJPEG,        MKTAG('d', 'm', 'b', '1') },

  139.     { CODEC_ID_MJPEG,        MKTAG('m', 'j', 'p', 'a') },

  140.     { CODEC_ID_LJPEG,        MKTAG('L', 'J', 'P', 'G') },

  141.     { CODEC_ID_MJPEG,        MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */

  142.     { CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */

  143.     { CODEC_ID_JPEGLS,       MKTAG('M', 'J', 'P', 'G') },

  144.     { CODEC_ID_MJPEG,        MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */

  145.     { CODEC_ID_MJPEG,        MKTAG('j', 'p', 'e', 'g') },

  146.     { CODEC_ID_MJPEG,        MKTAG('I', 'J', 'P', 'G') },

  147.     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'R', 'n') },

  148.     { CODEC_ID_MJPEG,        MKTAG('A', 'C', 'D', 'V') },

  149.     { CODEC_ID_MJPEG,        MKTAG('Q', 'I', 'V', 'G') },

  150.     { CODEC_ID_MJPEG,        MKTAG('S', 'L', 'M', 'J') }, /* SL M-JPEG */

  151.     { CODEC_ID_MJPEG,        MKTAG('C', 'J', 'P', 'G') }, /* Creative Webcam JPEG */

  152.     { CODEC_ID_MJPEG,        MKTAG('I', 'J', 'L', 'V') }, /* Intel JPEG Library Video Codec */

  153.     { CODEC_ID_MJPEG,        MKTAG('M', 'V', 'J', 'P') }, /* Midvid JPEG Video Codec */

  154.     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '1') },

  155.     { CODEC_ID_MJPEG,        MKTAG('A', 'V', 'I', '2') },

  156.     { CODEC_ID_MJPEG,        MKTAG('M', 'T', 'S', 'J') },

  157.     { CODEC_ID_MJPEG,        MKTAG('Z', 'J', 'P', 'G') }, /* Paradigm Matrix M-JPEG Codec */

  158.     { CODEC_ID_MJPEG,        MKTAG('M', 'M', 'J', 'P') },

  159.     { CODEC_ID_HUFFYUV,      MKTAG('H', 'F', 'Y', 'U') },

  160.     { CODEC_ID_FFVHUFF,      MKTAG('F', 'F', 'V', 'H') },

  161.     { CODEC_ID_CYUV,         MKTAG('C', 'Y', 'U', 'V') },

  162.     { CODEC_ID_RAWVIDEO,     MKTAG( 0 ,  0 ,  0 ,  0 ) },

  163.     { CODEC_ID_RAWVIDEO,     MKTAG( 3 ,  0 ,  0 ,  0 ) },

  164.     { CODEC_ID_RAWVIDEO,     MKTAG('I', '4', '2', '0') },

  165.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'Y', '2') },

  166.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', '2') },

  167.     { CODEC_ID_RAWVIDEO,     MKTAG('V', '4', '2', '2') },

  168.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'N', 'V') },

  169.     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'V') },

  170.     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'N', 'Y') },

  171.     { CODEC_ID_RAWVIDEO,     MKTAG('u', 'y', 'v', '1') },

  172.     { CODEC_ID_RAWVIDEO,     MKTAG('2', 'V', 'u', '1') },

  173.     { CODEC_ID_RAWVIDEO,     MKTAG('2', 'v', 'u', 'y') },

  174.     { CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', 's') },

  175.     { CODEC_ID_RAWVIDEO,     MKTAG('y', 'u', 'v', '2') },

  176.     { CODEC_ID_RAWVIDEO,     MKTAG('P', '4', '2', '2') },

  177.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '2') },

  178.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '1', '6') },

  179.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', '2', '4') },

  180.     { CODEC_ID_RAWVIDEO,     MKTAG('U', 'Y', 'V', 'Y') },

  181.     { CODEC_ID_RAWVIDEO,     MKTAG('V', 'Y', 'U', 'Y') },

  182.     { CODEC_ID_RAWVIDEO,     MKTAG('I', 'Y', 'U', 'V') },

  183.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', '0', '0') },

  184.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '8', ' ', ' ') },

  185.     { CODEC_ID_RAWVIDEO,     MKTAG('H', 'D', 'Y', 'C') },

  186.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },

  187.     { CODEC_ID_RAWVIDEO,     MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */

  188.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', '1') },

  189.     { CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '1', '2') },

  190.     { CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '2', '1') },

  191.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', 'B') },

  192.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '2', 'B') },

  193.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'U', 'V', '9') },

  194.     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },

  195.     { CODEC_ID_RAWVIDEO,     MKTAG('a', 'u', 'v', '2') },

  196.     { CODEC_ID_FRWU,         MKTAG('F', 'R', 'W', 'U') },

  197.     { CODEC_ID_R10K,         MKTAG('R', '1', '0', 'k') },

  198.     { CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },

  199.     { CODEC_ID_V210,         MKTAG('v', '2', '1', '0') },

  200.     { CODEC_ID_V410,         MKTAG('v', '4', '1', '0') },

  201.     { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '1') },

  202.     { CODEC_ID_INDEO3,       MKTAG('I', 'V', '3', '2') },

  203.     { CODEC_ID_INDEO4,       MKTAG('I', 'V', '4', '1') },

  204.     { CODEC_ID_INDEO5,       MKTAG('I', 'V', '5', '0') },

  205.     { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '1') },

  206.     { CODEC_ID_VP3,          MKTAG('V', 'P', '3', '0') },

  207.     { CODEC_ID_VP5,          MKTAG('V', 'P', '5', '0') },

  208.     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '0') },

  209.     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '1') },

  210.     { CODEC_ID_VP6,          MKTAG('V', 'P', '6', '2') },

  211.     { CODEC_ID_VP6F,         MKTAG('V', 'P', '6', 'F') },

  212.     { CODEC_ID_VP6F,         MKTAG('F', 'L', 'V', '4') },

  213.     { CODEC_ID_VP8,          MKTAG('V', 'P', '8', '0') },

  214.     { CODEC_ID_ASV1,         MKTAG('A', 'S', 'V', '1') },

  215.     { CODEC_ID_ASV2,         MKTAG('A', 'S', 'V', '2') },

  216.     { CODEC_ID_VCR1,         MKTAG('V', 'C', 'R', '1') },

  217.     { CODEC_ID_FFV1,         MKTAG('F', 'F', 'V', '1') },

  218.     { CODEC_ID_XAN_WC4,      MKTAG('X', 'x', 'a', 'n') },

  219.     { CODEC_ID_MIMIC,        MKTAG('L', 'M', '2', '0') },

  220.     { CODEC_ID_MSRLE,        MKTAG('m', 'r', 'l', 'e') },

  221.     { CODEC_ID_MSRLE,        MKTAG( 1 ,  0 ,  0 ,  0 ) },

  222.     { CODEC_ID_MSRLE,        MKTAG( 2 ,  0 ,  0 ,  0 ) },

  223.     { CODEC_ID_MSVIDEO1,     MKTAG('M', 'S', 'V', 'C') },

  224.     { CODEC_ID_MSVIDEO1,     MKTAG('m', 's', 'v', 'c') },

  225.     { CODEC_ID_MSVIDEO1,     MKTAG('C', 'R', 'A', 'M') },

  226.     { CODEC_ID_MSVIDEO1,     MKTAG('c', 'r', 'a', 'm') },

  227.     { CODEC_ID_MSVIDEO1,     MKTAG('W', 'H', 'A', 'M') },

  228.     { CODEC_ID_MSVIDEO1,     MKTAG('w', 'h', 'a', 'm') },

  229.     { CODEC_ID_CINEPAK,      MKTAG('c', 'v', 'i', 'd') },

  230.     { CODEC_ID_TRUEMOTION1,  MKTAG('D', 'U', 'C', 'K') },

  231.     { CODEC_ID_TRUEMOTION1,  MKTAG('P', 'V', 'E', 'Z') },

  232.     { CODEC_ID_MSZH,         MKTAG('M', 'S', 'Z', 'H') },

  233.     { CODEC_ID_ZLIB,         MKTAG('Z', 'L', 'I', 'B') },

  234.     { CODEC_ID_SNOW,         MKTAG('S', 'N', 'O', 'W') },

  235.     { CODEC_ID_4XM,          MKTAG('4', 'X', 'M', 'V') },

  236.     { CODEC_ID_FLV1,         MKTAG('F', 'L', 'V', '1') },

  237.     { CODEC_ID_FLASHSV,      MKTAG('F', 'S', 'V', '1') },

  238.     { CODEC_ID_SVQ1,         MKTAG('s', 'v', 'q', '1') },

  239.     { CODEC_ID_TSCC,         MKTAG('t', 's', 'c', 'c') },

  240.     { CODEC_ID_ULTI,         MKTAG('U', 'L', 'T', 'I') },

  241.     { CODEC_ID_VIXL,         MKTAG('V', 'I', 'X', 'L') },

  242.     { CODEC_ID_QPEG,         MKTAG('Q', 'P', 'E', 'G') },

  243.     { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '0') },

  244.     { CODEC_ID_QPEG,         MKTAG('Q', '1', '.', '1') },

  245.     { CODEC_ID_WMV3,         MKTAG('W', 'M', 'V', '3') },

  246.     { CODEC_ID_WMV3IMAGE,    MKTAG('W', 'M', 'V', 'P') },

  247.     { CODEC_ID_VC1,          MKTAG('W', 'V', 'C', '1') },

  248.     { CODEC_ID_VC1,          MKTAG('W', 'M', 'V', 'A') },

  249.     { CODEC_ID_VC1IMAGE,     MKTAG('W', 'V', 'P', '2') },

  250.     { CODEC_ID_LOCO,         MKTAG('L', 'O', 'C', 'O') },

  251.     { CODEC_ID_WNV1,         MKTAG('W', 'N', 'V', '1') },

  252.     { CODEC_ID_AASC,         MKTAG('A', 'A', 'S', 'C') },

  253.     { CODEC_ID_INDEO2,       MKTAG('R', 'T', '2', '1') },

  254.     { CODEC_ID_FRAPS,        MKTAG('F', 'P', 'S', '1') },

  255.     { CODEC_ID_THEORA,       MKTAG('t', 'h', 'e', 'o') },

  256.     { CODEC_ID_TRUEMOTION2,  MKTAG('T', 'M', '2', '0') },

  257.     { CODEC_ID_CSCD,         MKTAG('C', 'S', 'C', 'D') },

  258.     { CODEC_ID_ZMBV,         MKTAG('Z', 'M', 'B', 'V') },

  259.     { CODEC_ID_KMVC,         MKTAG('K', 'M', 'V', 'C') },

  260.     { CODEC_ID_CAVS,         MKTAG('C', 'A', 'V', 'S') },

  261.     { CODEC_ID_JPEG2000,     MKTAG('m', 'j', 'p', '2') },

  262.     { CODEC_ID_JPEG2000,     MKTAG('M', 'J', '2', 'C') },

  263.     { CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'C') },

  264.     { CODEC_ID_JPEG2000,     MKTAG('L', 'J', '2', 'K') },

  265.     { CODEC_ID_VMNC,         MKTAG('V', 'M', 'n', 'c') },

  266.     { CODEC_ID_TARGA,        MKTAG('t', 'g', 'a', ' ') },

  267.     { CODEC_ID_PNG,          MKTAG('M', 'P', 'N', 'G') },

  268.     { CODEC_ID_PNG,          MKTAG('P', 'N', 'G', '1') },

  269.     { CODEC_ID_CLJR,         MKTAG('C', 'L', 'J', 'R') },

  270.     { CODEC_ID_DIRAC,        MKTAG('d', 'r', 'a', 'c') },

  271.     { CODEC_ID_RPZA,         MKTAG('a', 'z', 'p', 'r') },

  272.     { CODEC_ID_RPZA,         MKTAG('R', 'P', 'Z', 'A') },

  273.     { CODEC_ID_RPZA,         MKTAG('r', 'p', 'z', 'a') },

  274.     { CODEC_ID_SP5X,         MKTAG('S', 'P', '5', '4') },

  275.     { CODEC_ID_AURA,         MKTAG('A', 'U', 'R', 'A') },

  276.     { CODEC_ID_AURA2,        MKTAG('A', 'U', 'R', '2') },

  277.     { CODEC_ID_DPX,          MKTAG('d', 'p', 'x', ' ') },

  278.     { CODEC_ID_KGV1,         MKTAG('K', 'G', 'V', '1') },

  279.     { CODEC_ID_LAGARITH,     MKTAG('L', 'A', 'G', 'S') },

  280.     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'A') },

  281.     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'R', 'G') },

  282.     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '0') },

  283.     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '2') },

  284.     { CODEC_ID_VBLE,         MKTAG('V', 'B', 'L', 'E') },

  285.     { CODEC_ID_DXTORY,       MKTAG('x', 't', 'o', 'r') },

  286.     { CODEC_ID_ZEROCODEC,    MKTAG('Z', 'E', 'C', 'O') },

  287.     { CODEC_ID_MSS1,         MKTAG('M', 'S', 'S', '1') },

  288.     { CODEC_ID_MSA1,         MKTAG('M', 'S', 'A', '1') },

  289.     { CODEC_ID_TSCC2,        MKTAG('T', 'S', 'C', '2') },

  290.     { CODEC_ID_MTS2,         MKTAG('M', 'T', 'S', '2') },

  291.     { CODEC_ID_NONE,         0 }

  292. };

  293. 

  294. const AVCodecTag ff_codec_wav_tags[] = {

  295.     { CODEC_ID_PCM_S16LE,       0x0001 },

  296.     { CODEC_ID_PCM_U8,          0x0001 }, /* must come after s16le in this list */

  297.     { CODEC_ID_PCM_S24LE,       0x0001 },

  298.     { CODEC_ID_PCM_S32LE,       0x0001 },

  299.     { CODEC_ID_ADPCM_MS,        0x0002 },

  300.     { CODEC_ID_PCM_F32LE,       0x0003 },

  301.     { CODEC_ID_PCM_F64LE,       0x0003 }, /* must come after f32le in this list */

  302.     { CODEC_ID_PCM_ALAW,        0x0006 },

  303.     { CODEC_ID_PCM_MULAW,       0x0007 },

  304.     { CODEC_ID_WMAVOICE,        0x000A },

  305.     { CODEC_ID_ADPCM_IMA_WAV,   0x0011 },

  306.     { CODEC_ID_PCM_ZORK,        0x0011 }, /* must come after adpcm_ima_wav in this list */

  307.     { CODEC_ID_ADPCM_YAMAHA,    0x0020 },

  308.     { CODEC_ID_TRUESPEECH,      0x0022 },

  309.     { CODEC_ID_GSM_MS,          0x0031 },

  310.     { CODEC_ID_ADPCM_G726,      0x0045 },

  311.     { CODEC_ID_MP2,             0x0050 },

  312.     { CODEC_ID_MP3,             0x0055 },

  313.     { CODEC_ID_AMR_NB,          0x0057 },

  314.     { CODEC_ID_AMR_WB,          0x0058 },

  315.     { CODEC_ID_ADPCM_IMA_DK4,   0x0061 },  /* rogue format number */

  316.     { CODEC_ID_ADPCM_IMA_DK3,   0x0062 },  /* rogue format number */

  317.     { CODEC_ID_ADPCM_IMA_WAV,   0x0069 },

  318.     { CODEC_ID_VOXWARE,         0x0075 },

  319.     { CODEC_ID_AAC,             0x00ff },

  320.     { CODEC_ID_SIPR,            0x0130 },

  321.     { CODEC_ID_WMAV1,           0x0160 },

  322.     { CODEC_ID_WMAV2,           0x0161 },

  323.     { CODEC_ID_WMAPRO,          0x0162 },

  324.     { CODEC_ID_WMALOSSLESS,     0x0163 },

  325.     { CODEC_ID_ADPCM_CT,        0x0200 },

  326.     { CODEC_ID_ATRAC3,          0x0270 },

  327.     { CODEC_ID_ADPCM_G722,      0x028F },

  328.     { CODEC_ID_IMC,             0x0401 },

  329.     { CODEC_ID_IAC,             0x0402 },

  330.     { CODEC_ID_GSM_MS,          0x1500 },

  331.     { CODEC_ID_TRUESPEECH,      0x1501 },

  332.     { CODEC_ID_AAC,             0x1600 }, /* ADTS AAC */

  333.     { CODEC_ID_AAC_LATM,        0x1602 },

  334.     { CODEC_ID_AC3,             0x2000 },

  335.     { CODEC_ID_DTS,             0x2001 },

  336.     { CODEC_ID_PCM_MULAW,       0x6c75 },

  337.     { CODEC_ID_AAC,             0x706d },

  338.     { CODEC_ID_AAC,             0x4143 },

  339.     { CODEC_ID_SPEEX,           0xA109 },

  340.     { CODEC_ID_FLAC,            0xF1AC },

  341.     { CODEC_ID_ADPCM_SWF,       ('S'<<8)+'F' },

  342.     { CODEC_ID_VORBIS,          ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?

  343. 

  344.     /* FIXME: All of the IDs below are not 16 bit and thus illegal. */

  345.     // for NuppelVideo (nuv.c)

  346.     { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },

  347.     { CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },

  348.     { CODEC_ID_MP3,       MKTAG('M', 'P', '3', ' ') },

  349.     { CODEC_ID_NONE,      0 },

  350. };

  351. 

  352. const AVMetadataConv ff_riff_info_conv[] = {

  353.     { "IART", "artist"    },

  354.     { "ICMT", "comment"   },

  355.     { "ICOP", "copyright" },

  356.     { "ICRD", "date"      },

  357.     { "IGNR", "genre"     },

  358.     { "ILNG", "language"  },

  359.     { "INAM", "title"     },

  360.     { "IPRD", "album"     },

  361.     { "IPRT", "track"     },

  362.     { "ISFT", "encoder"   },

  363.     { "ITCH", "encoded_by"},

  364.     { 0 },

  365. };

  366. 

  367. const char ff_riff_tags[][5] = {

  368.     "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",

  369.     "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",

  370.     "IPRT", "ISBJ", "ISFT", "ISHP", "ISRC", "ISRF", "ITCH",

  371.     {0}

  372. };

  373. 

  374. #if CONFIG_MUXERS

  375. int64_t ff_start_tag(AVIOContext *pb, const char *tag)

  376. {

  377.     ffio_wfourcc(pb, tag);

  378.     avio_wl32(pb, 0);

  379.     return avio_tell(pb);

  380. }

  381. 

  382. void ff_end_tag(AVIOContext *pb, int64_t start)

  383. {

  384.     int64_t pos;

  385. 

  386.     pos = avio_tell(pb);

  387.     avio_seek(pb, start - 4, SEEK_SET);

  388.     avio_wl32(pb, (uint32_t)(pos - start));

  389.     avio_seek(pb, pos, SEEK_SET);

  390. }

  391. 

  392. /* WAVEFORMATEX header */

  393. /* returns the size or -1 on error */

  394. int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)

  395. {

  396.     int bps, blkalign, bytespersec, frame_size;

  397.     int hdrsize = 18;

  398.     int waveformatextensible;

  399.     uint8_t temp[256];

  400.     uint8_t *riff_extradata= temp;

  401.     uint8_t *riff_extradata_start= temp;

  402. 

  403.     if(!enc->codec_tag || enc->codec_tag > 0xffff)

  404.         return -1;

  405. 

  406.     /* We use the known constant frame size for the codec if known, otherwise

  407.        fallback to using AVCodecContext.frame_size, which is not as reliable

  408.        for indicating packet duration */

  409.     frame_size = av_get_audio_frame_duration(enc, 0);

  410.     if (!frame_size)

  411.         frame_size = enc->frame_size;

  412. 

  413.     waveformatextensible =   (enc->channels > 2 && enc->channel_layout)

  414.                           || enc->sample_rate > 48000

  415.                           || av_get_bits_per_sample(enc->codec_id) > 16;

  416. 

  417.     if (waveformatextensible) {

  418.         avio_wl16(pb, 0xfffe);

  419.     } else {

  420.         avio_wl16(pb, enc->codec_tag);

  421.     }

  422.     avio_wl16(pb, enc->channels);

  423.     avio_wl32(pb, enc->sample_rate);

  424.     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3 || enc->codec_id == CODEC_ID_GSM_MS) {

  425.         bps = 0;

  426.     } else {

  427.         if (!(bps = av_get_bits_per_sample(enc->codec_id))) {

  428.             if (enc->bits_per_coded_sample)

  429.                 bps = enc->bits_per_coded_sample;

  430.             else

  431.                 bps = 16; // default to 16

  432.         }

  433.     }

  434.     if(bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample){

  435.         av_log(enc, AV_LOG_WARNING, "requested bits_per_coded_sample (%d) and actually stored (%d) differ\n", enc->bits_per_coded_sample, bps);

  436.     }

  437. 

  438.     if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {

  439.         /* this is wrong, but it seems many demuxers do not work if this is set

  440.            correctly */

  441.         blkalign = frame_size;

  442.         //blkalign = 144 * enc->bit_rate/enc->sample_rate;

  443.     } else if (enc->codec_id == CODEC_ID_AC3) {

  444.             blkalign = 3840; //maximum bytes per frame

  445.     } else if (enc->block_align != 0) { /* specified by the codec */

  446.         blkalign = enc->block_align;

  447.     } else

  448.         blkalign = bps * enc->channels / av_gcd(8, bps);

  449.     if (enc->codec_id == CODEC_ID_PCM_U8 ||

  450.         enc->codec_id == CODEC_ID_PCM_S24LE ||

  451.         enc->codec_id == CODEC_ID_PCM_S32LE ||

  452.         enc->codec_id == CODEC_ID_PCM_F32LE ||

  453.         enc->codec_id == CODEC_ID_PCM_F64LE ||

  454.         enc->codec_id == CODEC_ID_PCM_S16LE) {

  455.         bytespersec = enc->sample_rate * blkalign;

  456.     } else {

  457.         bytespersec = enc->bit_rate / 8;

  458.     }

  459.     avio_wl32(pb, bytespersec); /* bytes per second */

  460.     avio_wl16(pb, blkalign); /* block align */

  461.     avio_wl16(pb, bps); /* bits per sample */

  462.     if (enc->codec_id == CODEC_ID_MP3) {

  463.         hdrsize += 12;

  464.         bytestream_put_le16(&riff_extradata, 1);    /* wID */

  465.         bytestream_put_le32(&riff_extradata, 2);    /* fdwFlags */

  466.         bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */

  467.         bytestream_put_le16(&riff_extradata, 1);    /* nFramesPerBlock */

  468.         bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */

  469.     } else if (enc->codec_id == CODEC_ID_MP2) {

  470.         hdrsize += 22;

  471.         bytestream_put_le16(&riff_extradata, 2);                          /* fwHeadLayer */

  472.         bytestream_put_le32(&riff_extradata, enc->bit_rate);              /* dwHeadBitrate */

  473.         bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); /* fwHeadMode */

  474.         bytestream_put_le16(&riff_extradata, 0);                          /* fwHeadModeExt */

  475.         bytestream_put_le16(&riff_extradata, 1);                          /* wHeadEmphasis */

  476.         bytestream_put_le16(&riff_extradata, 16);                         /* fwHeadFlags */

  477.         bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSLow */

  478.         bytestream_put_le32(&riff_extradata, 0);                          /* dwPTSHigh */

  479.     } else if (enc->codec_id == CODEC_ID_GSM_MS || enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {

  480.         hdrsize += 2;

  481.         bytestream_put_le16(&riff_extradata, frame_size); /* wSamplesPerBlock */

  482.     } else if(enc->extradata_size){

  483.         riff_extradata_start= enc->extradata;

  484.         riff_extradata= enc->extradata + enc->extradata_size;

  485.         hdrsize += enc->extradata_size;

  486.     }

  487.     if(waveformatextensible) {                                    /* write WAVEFORMATEXTENSIBLE extensions */

  488.         hdrsize += 22;

  489.         avio_wl16(pb, riff_extradata - riff_extradata_start + 22); /* 22 is WAVEFORMATEXTENSIBLE size */

  490.         avio_wl16(pb, bps);                                        /* ValidBitsPerSample || SamplesPerBlock || Reserved */

  491.         avio_wl32(pb, enc->channel_layout);                        /* dwChannelMask */

  492.         avio_wl32(pb, enc->codec_tag);                             /* GUID + next 3 */

  493.         avio_wl32(pb, 0x00100000);

  494.         avio_wl32(pb, 0xAA000080);

  495.         avio_wl32(pb, 0x719B3800);

  496.     } else {

  497.         avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */

  498.     }

  499.     avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);

  500.     if(hdrsize&1){

  501.         hdrsize++;

  502.         avio_w8(pb, 0);

  503.     }

  504. 

  505.     return hdrsize;

  506. }

  507. 

  508. /* BITMAPINFOHEADER header */

  509. void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)

  510. {

  511.     avio_wl32(pb, 40 + enc->extradata_size); /* size */

  512.     avio_wl32(pb, enc->width);

  513.     //We always store RGB TopDown

  514.     avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);

  515.     avio_wl16(pb, 1); /* planes */

  516. 

  517.     avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); /* depth */

  518.     /* compression type */

  519.     avio_wl32(pb, enc->codec_tag);

  520.     avio_wl32(pb, enc->width * enc->height * 3);

  521.     avio_wl32(pb, 0);

  522.     avio_wl32(pb, 0);

  523.     avio_wl32(pb, 0);

  524.     avio_wl32(pb, 0);

  525. 

  526.     avio_write(pb, enc->extradata, enc->extradata_size);

  527. 

  528.     if (!for_asf && enc->extradata_size & 1)

  529.         avio_w8(pb, 0);

  530. }

  531. #endif //CONFIG_MUXERS

  532. 

  533. #if CONFIG_DEMUXERS

  534. /* We could be given one of the three possible structures here:

  535.  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure

  536.  * is an expansion of the previous one with the fields added

  537.  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and

  538.  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself

  539.  * an openended structure.

  540.  */

  541. int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)

  542. {

  543.     int id;

  544. 

  545.     id = avio_rl16(pb);

  546.     codec->codec_type = AVMEDIA_TYPE_AUDIO;

  547.     codec->codec_tag = id;

  548.     codec->channels = avio_rl16(pb);

  549.     codec->sample_rate = avio_rl32(pb);

  550.     codec->bit_rate = avio_rl32(pb) * 8;

  551.     codec->block_align = avio_rl16(pb);

  552.     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */

  553.         codec->bits_per_coded_sample = 8;

  554.     }else

  555.         codec->bits_per_coded_sample = avio_rl16(pb);

  556.     if (size >= 18) {  /* We're obviously dealing with WAVEFORMATEX */

  557.         int cbSize = avio_rl16(pb); /* cbSize */

  558.         size -= 18;

  559.         cbSize = FFMIN(size, cbSize);

  560.         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */

  561.             codec->bits_per_coded_sample = avio_rl16(pb);

  562.             codec->channel_layout = avio_rl32(pb); /* dwChannelMask */

  563.             id = avio_rl32(pb); /* 4 first bytes of GUID */

  564.             avio_skip(pb, 12); /* skip end of GUID */

  565.             cbSize -= 22;

  566.             size -= 22;

  567.         }

  568.         codec->extradata_size = cbSize;

  569.         if (cbSize > 0) {

  570.             av_free(codec->extradata);

  571.             codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  572.             if (!codec->extradata)

  573.                 return AVERROR(ENOMEM);

  574.             avio_read(pb, codec->extradata, codec->extradata_size);

  575.             size -= cbSize;

  576.         }

  577. 

  578.         /* It is possible for the chunk to contain garbage at the end */

  579.         if (size > 0)

  580.             avio_skip(pb, size);

  581.     }

  582.     codec->codec_id = ff_wav_codec_get_id(id, codec->bits_per_coded_sample);

  583.     if (codec->codec_id == CODEC_ID_AAC_LATM) {

  584.         /* channels and sample_rate values are those prior to applying SBR and/or PS */

  585.         codec->channels    = 0;

  586.         codec->sample_rate = 0;

  587.     }

  588.     /* override bits_per_coded_sample for G.726 */

  589.     if (codec->codec_id == CODEC_ID_ADPCM_G726)

  590.         codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;

  591. 

  592.     return 0;

  593. }

  594. 

  595. 

  596. enum CodecID ff_wav_codec_get_id(unsigned int tag, int bps)

  597. {

  598.     enum CodecID id;

  599.     id = ff_codec_get_id(ff_codec_wav_tags, tag);

  600.     if (id <= 0)

  601.         return id;

  602.     /* handle specific u8 codec */

  603.     if (id == CODEC_ID_PCM_S16LE && bps == 8)

  604.         id = CODEC_ID_PCM_U8;

  605.     if (id == CODEC_ID_PCM_S16LE && bps == 24)

  606.         id = CODEC_ID_PCM_S24LE;

  607.     if (id == CODEC_ID_PCM_S16LE && bps == 32)

  608.         id = CODEC_ID_PCM_S32LE;

  609.     if (id == CODEC_ID_PCM_F32LE && bps == 64)

  610.         id = CODEC_ID_PCM_F64LE;

  611.     if (id == CODEC_ID_ADPCM_IMA_WAV && bps == 8)

  612.         id = CODEC_ID_PCM_ZORK;

  613.     return id;

  614. }

  615. 

  616. int ff_get_bmp_header(AVIOContext *pb, AVStream *st)

  617. {

  618.     int tag1;

  619.     avio_rl32(pb); /* size */

  620.     st->codec->width = avio_rl32(pb);

  621.     st->codec->height = (int32_t)avio_rl32(pb);

  622.     avio_rl16(pb); /* planes */

  623.     st->codec->bits_per_coded_sample= avio_rl16(pb); /* depth */

  624.     tag1 = avio_rl32(pb);

  625.     avio_rl32(pb); /* ImageSize */

  626.     avio_rl32(pb); /* XPelsPerMeter */

  627.     avio_rl32(pb); /* YPelsPerMeter */

  628.     avio_rl32(pb); /* ClrUsed */

  629.     avio_rl32(pb); /* ClrImportant */

  630.     return tag1;

  631. }

  632. #endif // CONFIG_DEMUXERS

  633. 

  634. void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)

  635. {

  636.     int gcd;

  637.     int audio_frame_size;

  638. 

  639.     /* We use the known constant frame size for the codec if known, otherwise

  640.        fallback to using AVCodecContext.frame_size, which is not as reliable

  641.        for indicating packet duration */

  642.     audio_frame_size = av_get_audio_frame_duration(stream, 0);

  643.     if (!audio_frame_size)

  644.         audio_frame_size = stream->frame_size;

  645. 

  646.     *au_ssize= stream->block_align;

  647.     if (audio_frame_size && stream->sample_rate) {

  648.         *au_scale = audio_frame_size;

  649.         *au_rate= stream->sample_rate;

  650.     }else if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||

  651.              stream->codec_type == AVMEDIA_TYPE_DATA ||

  652.              stream->codec_type == AVMEDIA_TYPE_SUBTITLE){

  653.         *au_scale= stream->time_base.num;

  654.         *au_rate = stream->time_base.den;

  655.     }else{

  656.         *au_scale= stream->block_align ? stream->block_align*8 : 8;

  657.         *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;

  658.     }

  659.     gcd= av_gcd(*au_scale, *au_rate);

  660.     *au_scale /= gcd;

  661.     *au_rate /= gcd;

  662. }

  663. 

  664. int ff_read_riff_info(AVFormatContext *s, int64_t size)

  665. {

  666.     int64_t start, end, cur;

  667.     AVIOContext *pb = s->pb;

  668. 

  669.     start = avio_tell(pb);

  670.     end = start + size;

  671. 

  672.     while ((cur = avio_tell(pb)) >= 0 && cur <= end - 8 /* = tag + size */) {

  673.         uint32_t chunk_code;

  674.         int64_t chunk_size;

  675.         char key[5] = {0};

  676.         char *value;

  677. 

  678.         chunk_code = avio_rl32(pb);

  679.         chunk_size = avio_rl32(pb);

  680.         if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {

  681.             av_log(s, AV_LOG_ERROR, "too big INFO subchunk\n");

  682.             return AVERROR_INVALIDDATA;

  683.         }

  684. 

  685.         chunk_size += (chunk_size & 1);

  686. 

  687.         value = av_malloc(chunk_size + 1);

  688.         if (!value) {

  689.             av_log(s, AV_LOG_ERROR, "out of memory, unable to read INFO tag\n");

  690.             return AVERROR(ENOMEM);

  691.         }

  692. 

  693.         AV_WL32(key, chunk_code);

  694. 

  695.         if (avio_read(pb, value, chunk_size) != chunk_size) {

  696.             av_free(value);

  697.             av_log(s, AV_LOG_ERROR, "premature end of file while reading INFO tag\n");

  698.             return AVERROR_INVALIDDATA;

  699.         }

  700. 

  701.         value[chunk_size] = 0;

  702. 

  703.         av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);

  704.     }

  705. 

  706.     return 0;

  707. }