libavformat/isom.c

   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 "riff.h"
  26 #include "isom.h"
  27
  28 /* http://www.mp4ra.org */
  29 /* ordered by muxing preference */
  30 const AVCodecTag ff_mp4_obj_type[] = {
  31     { CODEC_ID_MPEG4     , 0x20 },
  32     { CODEC_ID_H264      , 0x21 },
  33     { CODEC_ID_AAC       , 0x40 },
  34     { CODEC_ID_MPEG2VIDEO, 0x61 }, /* MPEG2 Main */
  35     { CODEC_ID_MPEG2VIDEO, 0x60 }, /* MPEG2 Simple */
  36     { CODEC_ID_MPEG2VIDEO, 0x62 }, /* MPEG2 SNR */
  37     { CODEC_ID_MPEG2VIDEO, 0x63 }, /* MPEG2 Spatial */
  38     { CODEC_ID_MPEG2VIDEO, 0x64 }, /* MPEG2 High */
  39     { CODEC_ID_MPEG2VIDEO, 0x65 }, /* MPEG2 422 */
  40     { CODEC_ID_AAC       , 0x66 }, /* MPEG2 AAC Main */
  41     { CODEC_ID_AAC       , 0x67 }, /* MPEG2 AAC Low */
  42     { CODEC_ID_AAC       , 0x68 }, /* MPEG2 AAC SSR */
  43     { CODEC_ID_MP3       , 0x69 }, /* 13818-3 */
  44     { CODEC_ID_MP2       , 0x69 }, /* 11172-3 */
  45     { CODEC_ID_MPEG1VIDEO, 0x6A }, /* 11172-2 */
  46     { CODEC_ID_MP3       , 0x6B }, /* 11172-3 */
  47     { CODEC_ID_MJPEG     , 0x6C }, /* 10918-1 */
  48     { CODEC_ID_PNG       , 0x6D },
  49     { CODEC_ID_JPEG2000  , 0x6E }, /* 15444-1 */
  50     { CODEC_ID_VC1       , 0xA3 },
  51     { CODEC_ID_DIRAC     , 0xA4 },
  52     { CODEC_ID_AC3       , 0xA5 },
  53     { CODEC_ID_VORBIS    , 0xDD }, /* non standard, gpac uses it */
  54     { CODEC_ID_DVD_SUBTITLE, 0xE0 }, /* non standard, see unsupported-embedded-subs-2.mp4 */
  55     { CODEC_ID_QCELP     , 0xE1 },
  56     { 0, 0 },
  57 };
  58
  59 const AVCodecTag codec_movvideo_tags[] = {
  60 /*  { CODEC_ID_, MKTAG('I', 'V', '5', '0') }, *//* Indeo 5.0 */
  61
  62     { CODEC_ID_RAWVIDEO, MKTAG('r', 'a', 'w', ' ') }, /* Uncompressed RGB */
  63 /*  { CODEC_ID_RAWVIDEO, MKTAG('Y', 'u', 'v', '2') }, *//* Uncompressed YUV422 */
  64     { CODEC_ID_RAWVIDEO, MKTAG('A', 'V', 'U', 'I') }, /* YUV with alpha-channel (AVID Uncompressed) */
  65     { CODEC_ID_RAWVIDEO, MKTAG('2', 'v', 'u', 'y') }, /* UNCOMPRESSED 8BIT 4:2:2 */
  66
  67     { CODEC_ID_MJPEG,  MKTAG('j', 'p', 'e', 'g') }, /* PhotoJPEG */
  68     { CODEC_ID_MJPEG,  MKTAG('m', 'j', 'p', 'a') }, /* Motion-JPEG (format A) */
  69     { CODEC_ID_MJPEG,  MKTAG('A', 'V', 'D', 'J') }, /* MJPEG with alpha-channel (AVID JFIF meridien compressed) */
  70 /*  { CODEC_ID_MJPEG,  MKTAG('A', 'V', 'R', 'n') }, *//* MJPEG with alpha-channel (AVID ABVB/Truevision NuVista) */
  71     { CODEC_ID_MJPEG,  MKTAG('d', 'm', 'b', '1') }, /* Motion JPEG OpenDML */
  72     { CODEC_ID_MJPEGB, MKTAG('m', 'j', 'p', 'b') }, /* Motion-JPEG (format B) */
  73
  74     { CODEC_ID_SVQ1, MKTAG('S', 'V', 'Q', '1') }, /* Sorenson Video v1 */
  75     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') }, /* Sorenson Video v1 */
  76     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', 'i') }, /* Sorenson Video v1 (from QT specs)*/
  77     { CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') }, /* Sorenson Video v3 */
  78
  79     { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
  80     { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') }, /* OpenDiVX *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */
  81     { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },
  82     { CODEC_ID_MPEG4, MKTAG('3', 'I', 'V', '2') }, /* experimental: 3IVX files before ivx D4 4.5.1 */
  83
  84     { CODEC_ID_H263, MKTAG('h', '2', '6', '3') }, /* H263 */
  85     { CODEC_ID_H263, MKTAG('s', '2', '6', '3') }, /* H263 ?? works */
  86
  87     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 'p') }, /* DV PAL */
  88     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') }, /* DV NTSC */
  89     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'p', 'p') }, /* DVCPRO PAL produced by FCP */
  90     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'p') }, /* DVCPRO50 PAL produced by FCP */
  91     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'n') }, /* DVCPRO50 NTSC produced by FCP */
  92     { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, /* AVID DV */
  93     { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', '1') }, /* AVID DV100 */
  94     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'q') }, /* DVCPRO HD 720p50 */
  95     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'p') }, /* DVCPRO HD 720p60 */
  96     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '5') }, /* DVCPRO HD 50i produced by FCP */
  97     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '6') }, /* DVCPRO HD 60i produced by FCP */
  98     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '3') }, /* DVCPRO HD 30p produced by FCP */
  99
 100     { CODEC_ID_VP3,     MKTAG('V', 'P', '3', '1') }, /* On2 VP3 */
 101     { CODEC_ID_RPZA,    MKTAG('r', 'p', 'z', 'a') }, /* Apple Video (RPZA) */
 102     { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') }, /* Cinepak */
 103     { CODEC_ID_8BPS,    MKTAG('8', 'B', 'P', 'S') }, /* Planar RGB (8BPS) */
 104     { CODEC_ID_SMC,     MKTAG('s', 'm', 'c', ' ') }, /* Apple Graphics (SMC) */
 105     { CODEC_ID_QTRLE,   MKTAG('r', 'l', 'e', ' ') }, /* Apple Animation (RLE) */
 106     { CODEC_ID_MSRLE,   MKTAG('W', 'R', 'L', 'E') },
 107     { CODEC_ID_QDRAW,   MKTAG('q', 'd', 'r', 'w') }, /* QuickDraw */
 108
 109     { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') }, /* AVC-1/H.264 */
 110
 111     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'e', 'g') }, /* MPEG */
 112     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '1') }, /* MPEG2 HDV 720p30 */
 113     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '2') }, /* MPEG2 HDV 1080i60 */
 114     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '3') }, /* MPEG2 HDV 1080i50 */
 115     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '5') }, /* MPEG2 HDV 720p25 */
 116     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '6') }, /* MPEG2 HDV 1080p24 */
 117     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '7') }, /* MPEG2 HDV 1080p25 */
 118     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '8') }, /* MPEG2 HDV 1080p30 */
 119     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '5', 'n') }, /* MPEG2 IMX NTSC 525/60 50mb/s produced by FCP */
 120     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '5', 'p') }, /* MPEG2 IMX PAL 625/50 50mb/s produced by FCP */
 121     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '4', 'n') }, /* MPEG2 IMX NTSC 525/60 40mb/s produced by FCP */
 122     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '4', 'p') }, /* MPEG2 IMX PAL 625/50 40mb/s produced by FCP */
 123     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '3', 'n') }, /* MPEG2 IMX NTSC 525/60 30mb/s produced by FCP */
 124     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '3', 'p') }, /* MPEG2 IMX PAL 625/50 30mb/s produced by FCP */
 125     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', '9') }, /* XDCAM HD422 720p60 CBR */
 126     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'a') }, /* XDCAM HD422 720p50 CBR */
 127     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'b') }, /* XDCAM HD422 1080i60 CBR */
 128     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'c') }, /* XDCAM HD422 1080i50 CBR */
 129     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'd') }, /* XDCAM HD422 1080p24 CBR */
 130     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'e') }, /* XDCAM HD422 1080p25 CBR */
 131     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', '5', 'f') }, /* XDCAM HD422 1080p30 CBR */
 132     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '1') }, /* XDCAM EX 720p30 VBR */
 133     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '2') }, /* XDCAM HD 1080i60 */
 134     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '3') }, /* XDCAM HD 1080i50 VBR */
 135     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '4') }, /* XDCAM EX 720p24 VBR */
 136     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '5') }, /* XDCAM EX 720p25 VBR */
 137     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '6') }, /* XDCAM HD 1080p24 VBR */
 138     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '7') }, /* XDCAM HD 1080p25 VBR */
 139     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '8') }, /* XDCAM HD 1080p30 VBR */
 140     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', '9') }, /* XDCAM EX 720p60 VBR */
 141     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'a') }, /* XDCAM EX 720p50 VBR */
 142     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'b') }, /* XDCAM EX 1080i60 VBR */
 143     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'c') }, /* XDCAM EX 1080i50 VBR */
 144     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'd') }, /* XDCAM EX 1080p24 VBR */
 145     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'e') }, /* XDCAM EX 1080p25 VBR */
 146     { CODEC_ID_MPEG2VIDEO, MKTAG('x', 'd', 'v', 'f') }, /* XDCAM EX 1080p30 VBR */
 147     { CODEC_ID_MPEG2VIDEO, MKTAG('A', 'V', 'm', 'p') }, /* AVID IMX PAL */
 148
 149   //{ CODEC_ID_JPEG2000, MKTAG('m', 'j', 'p', '2') }, /* JPEG 2000 produced by FCP */
 150
 151     { CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') }, /* Truevision Targa */
 152     { CODEC_ID_TIFF,  MKTAG('t', 'i', 'f', 'f') }, /* TIFF embedded in MOV */
 153     { CODEC_ID_GIF,   MKTAG('g', 'i', 'f', ' ') }, /* embedded gif files as frames (usually one "click to play movie" frame) */
 154     { CODEC_ID_PNG,   MKTAG('p', 'n', 'g', ' ') },
 155
 156     { CODEC_ID_VC1, MKTAG('v', 'c', '-', '1') }, /* SMPTE RP 2025 */
 157     { CODEC_ID_CAVS, MKTAG('a', 'v', 's', '2') },
 158
 159     { CODEC_ID_DIRAC, MKTAG('d', 'r', 'a', 'c') },
 160     { CODEC_ID_DNXHD, MKTAG('A', 'V', 'd', 'n') }, /* AVID DNxHD */
 161     { CODEC_ID_SGI,   MKTAG('s', 'g', 'i', ' ') }, /* SGI  */
 162
 163     { CODEC_ID_NONE, 0 },
 164 };
 165
 166 const AVCodecTag codec_movaudio_tags[] = {
 167     { CODEC_ID_PCM_S32BE, MKTAG('i', 'n', '3', '2') },
 168     { CODEC_ID_PCM_S32LE, MKTAG('i', 'n', '3', '2') },
 169     { CODEC_ID_PCM_S24BE, MKTAG('i', 'n', '2', '4') },
 170     { CODEC_ID_PCM_S24LE, MKTAG('i', 'n', '2', '4') },
 171     { CODEC_ID_PCM_S16BE, MKTAG('t', 'w', 'o', 's') }, /* 16 bits */
 172     { CODEC_ID_PCM_S16LE, MKTAG('s', 'o', 'w', 't') }, /*  */
 173     { CODEC_ID_PCM_S16LE, MKTAG('l', 'p', 'c', 'm') },
 174     { CODEC_ID_PCM_F32BE, MKTAG('f', 'l', '3', '2') },
 175     { CODEC_ID_PCM_F64BE, MKTAG('f', 'l', '6', '4') },
 176     { CODEC_ID_PCM_S8,    MKTAG('s', 'o', 'w', 't') },
 177     { CODEC_ID_PCM_U8,    MKTAG('r', 'a', 'w', ' ') }, /* 8 bits unsigned */
 178     { CODEC_ID_PCM_U8,    MKTAG('N', 'O', 'N', 'E') }, /* uncompressed */
 179     { CODEC_ID_PCM_MULAW, MKTAG('u', 'l', 'a', 'w') }, /*  */
 180     { CODEC_ID_PCM_ALAW,  MKTAG('a', 'l', 'a', 'w') }, /*  */
 181
 182     { CODEC_ID_ADPCM_IMA_QT, MKTAG('i', 'm', 'a', '4') }, /* IMA-4 ADPCM */
 183
 184     { CODEC_ID_MACE3, MKTAG('M', 'A', 'C', '3') }, /* Macintosh Audio Compression and Expansion 3:1 */
 185     { CODEC_ID_MACE6, MKTAG('M', 'A', 'C', '6') }, /* Macintosh Audio Compression and Expansion 6:1 */
 186
 187     { CODEC_ID_MP3, MKTAG('.', 'm', 'p', '3') }, /* MPEG layer 3 */ /* sample files at http://www.3ivx.com/showcase.html use this tag */
 188     { CODEC_ID_MP3, 0x6D730055 }, /* MPEG layer 3 */
 189
 190 /*  { CODEC_ID_OGG_VORBIS, MKTAG('O', 'g', 'g', 'S') }, *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */
 191
 192     { CODEC_ID_AAC, MKTAG('m', 'p', '4', 'a') }, /* MPEG-4 AAC */
 193     { CODEC_ID_AC3, MKTAG('a', 'c', '-', '3') }, /* ETSI TS 102 366 Annex F */
 194
 195     { CODEC_ID_AMR_NB, MKTAG('s', 'a', 'm', 'r') }, /* AMR-NB 3gp */
 196     { CODEC_ID_AMR_WB, MKTAG('s', 'a', 'w', 'b') }, /* AMR-WB 3gp */
 197
 198     { CODEC_ID_GSM,  MKTAG('a', 'g', 's', 'm') },
 199     { CODEC_ID_ALAC, MKTAG('a', 'l', 'a', 'c') }, /* Apple Lossless */
 200
 201     { CODEC_ID_QCELP, MKTAG('Q','c','l','p') },
 202     { CODEC_ID_QCELP, MKTAG('s','q','c','p') }, /* ISO Media fourcc */
 203
 204     { CODEC_ID_QDM2, MKTAG('Q', 'D', 'M', '2') }, /* QDM2 */
 205
 206     { CODEC_ID_DVAUDIO, MKTAG('v', 'd', 'v', 'a') },
 207     { CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'c', 'a') },
 208
 209     { CODEC_ID_WMAV2, MKTAG('W', 'M', 'A', '2') },
 210
 211     { CODEC_ID_NONE, 0 },
 212 };
 213
 214 const AVCodecTag ff_codec_movsubtitle_tags[] = {
 215     { CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') },
 216     { CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') },
 217     { CODEC_ID_NONE, 0 },
 218 };
 219
 220 /* map numeric codes from mdhd atom to ISO 639 */
 221 /* cf. QTFileFormat.pdf p253, qtff.pdf p205 */
 222 /* http://developer.apple.com/documentation/mac/Text/Text-368.html */
 223 /* deprecated by putting the code as 3*5bit ascii */
 224 static const char *mov_mdhd_language_map[] = {
 225     /* 0-9 */
 226     "eng", "fra", "ger", "ita", "dut", "sve", "spa", "dan", "por", "nor",
 227     "heb", "jpn", "ara", "fin", "gre", "ice", "mlt", "tur", "hr "/*scr*/, "chi"/*ace?*/,
 228     "urd", "hin", "tha", "kor", "lit", "pol", "hun", "est", "lav",  NULL,
 229     "fo ",  NULL, "rus", "chi",  NULL, "iri", "alb", "ron", "ces", "slk",
 230     "slv", "yid", "sr ", "mac", "bul", "ukr", "bel", "uzb", "kaz", "aze",
 231     /*?*/
 232     "aze", "arm", "geo", "mol", "kir", "tgk", "tuk", "mon",  NULL, "pus",
 233     "kur", "kas", "snd", "tib", "nep", "san", "mar", "ben", "asm", "guj",
 234     "pa ", "ori", "mal", "kan", "tam", "tel",  NULL, "bur", "khm", "lao",
 235     /*                   roman? arabic? */
 236     "vie", "ind", "tgl", "may", "may", "amh", "tir", "orm", "som", "swa",
 237     /*==rundi?*/
 238     NULL, "run",  NULL, "mlg", "epo",  NULL,  NULL,  NULL,  NULL,  NULL,
 239     /* 100 */
 240     NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 241     NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
 242     NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL, "wel", "baq",
 243     "cat", "lat", "que", "grn", "aym", "tat", "uig", "dzo", "jav"
 244 };
 245
 246 int ff_mov_iso639_to_lang(const char *lang, int mp4)
 247 {
 248     int i, code = 0;
 249
 250     /* old way, only for QT? */
 251     for (i = 0; !mp4 && (i < (sizeof(mov_mdhd_language_map)/sizeof(char *))); i++) {
 252         if (mov_mdhd_language_map[i] && !strcmp(lang, mov_mdhd_language_map[i]))
 253             return i;
 254     }
 255     /* XXX:can we do that in mov too? */
 256     if (!mp4)
 257         return 0;
 258     /* handle undefined as such */
 259     if (lang[0] == '\0')
 260         lang = "und";
 261     /* 5bit ascii */
 262     for (i = 0; i < 3; i++) {
 263         unsigned char c = (unsigned char)lang[i];
 264         if (c < 0x60)
 265             return 0;
 266         if (c > 0x60 + 0x1f)
 267             return 0;
 268         code <<= 5;
 269         code |= (c - 0x60);
 270     }
 271     return code;
 272 }
 273
 274 int ff_mov_lang_to_iso639(int code, char *to)
 275 {
 276     int i;
 277     /* is it the mangled iso code? */
 278     /* see http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt */
 279     if (code > 138) {
 280         for (i = 2; i >= 0; i--) {
 281             to[i] = 0x60 + (code & 0x1f);
 282             code >>= 5;
 283         }
 284         return 1;
 285     }
 286     /* old fashion apple lang code */
 287     if (code >= (sizeof(mov_mdhd_language_map)/sizeof(char *)))
 288         return 0;
 289     if (!mov_mdhd_language_map[code])
 290         return 0;
 291     strncpy(to, mov_mdhd_language_map[code], 4);
 292     return 1;
 293 }