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FFmpeg/libavformat/mov.c

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  1. /*

  2.  * MOV decoder.

  3.  * Copyright (c) 2001 Fabrice Bellard.

  4.  *

  5.  * This library is free software; you can redistribute it and/or

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

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

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

  16.  * License along with this library; if not, write to the Free Software

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

  18.  */

  19. 

  20. #include <limits.h>

  21. 

  22. //#define DEBUG

  23. 

  24. #include "avformat.h"

  25. #include "avi.h"

  26. #include "mov.h"

  27. 

  28. #ifdef CONFIG_ZLIB

  29. #include <zlib.h>

  30. #endif

  31. 

  32. /*

  33.  * First version by Francois Revol revol@free.fr

  34.  * Seek function by Gael Chardon gael.dev@4now.net

  35.  *

  36.  * Features and limitations:

  37.  * - reads most of the QT files I have (at least the structure),

  38.  *   the exceptions are .mov with zlib compressed headers ('cmov' section). It shouldn't be hard to implement.

  39.  *   FIXED, Francois Revol, 07/17/2002

  40.  * - ffmpeg has nearly none of the usual QuickTime codecs,

  41.  *   although I succesfully dumped raw and mp3 audio tracks off .mov files.

  42.  *   Sample QuickTime files with mp3 audio can be found at: http://www.3ivx.com/showcase.html

  43.  * - .mp4 parsing is still hazardous, although the format really is QuickTime with some minor changes

  44.  *   (to make .mov parser crash maybe ?), despite what they say in the MPEG FAQ at

  45.  *   http://mpeg.telecomitalialab.com/faq.htm

  46.  * - the code is quite ugly... maybe I won't do it recursive next time :-)

  47.  * - seek is not supported with files that contain edit list

  48.  *

  49.  * Funny I didn't know about http://sourceforge.net/projects/qt-ffmpeg/

  50.  * when coding this :) (it's a writer anyway)

  51.  *

  52.  * Reference documents:

  53.  * http://www.geocities.com/xhelmboyx/quicktime/formats/qtm-layout.txt

  54.  * Apple:

  55.  *  http://developer.apple.com/documentation/QuickTime/QTFF/

  56.  *  http://developer.apple.com/documentation/QuickTime/QTFF/qtff.pdf

  57.  * QuickTime is a trademark of Apple (AFAIK :))

  58.  */

  59. 

  60. #include "qtpalette.h"

  61. 

  62. 

  63. #undef NDEBUG

  64. #include <assert.h>

  65. 

  66. /* Allows seeking */

  67. #define MOV_SEEK

  68. 

  69. /* Special handling for movies created with Minolta Dimaxe Xi*/

  70. /* this fix should not interfere with other .mov files, but just in case*/

  71. #define MOV_MINOLTA_FIX

  72. 

  73. /* some streams in QT (and in MP4 mostly) aren't either video nor audio */

  74. /* so we first list them as this, then clean up the list of streams we give back, */

  75. /* getting rid of these */

  76. #define CODEC_TYPE_MOV_OTHER    (enum CodecType) 2

  77. 

  78. /* http://gpac.sourceforge.net/tutorial/mediatypes.htm */

  79. const CodecTag ff_mov_obj_type[] = {

  80.     { CODEC_ID_MPEG4     ,  32 },

  81.     { CODEC_ID_H264      ,  33 },

  82.     { CODEC_ID_AAC       ,  64 },

  83.     { CODEC_ID_MPEG2VIDEO,  96 }, /* MPEG2 Simple */

  84.     { CODEC_ID_MPEG2VIDEO,  97 }, /* MPEG2 Main */

  85.     { CODEC_ID_MPEG2VIDEO,  98 }, /* MPEG2 SNR */

  86.     { CODEC_ID_MPEG2VIDEO,  99 }, /* MPEG2 Spatial */

  87.     { CODEC_ID_MPEG2VIDEO, 100 }, /* MPEG2 High */

  88.     { CODEC_ID_MPEG2VIDEO, 101 }, /* MPEG2 422 */

  89.     { CODEC_ID_AAC       , 102 }, /* MPEG2 AAC Main */

  90.     { CODEC_ID_AAC       , 103 }, /* MPEG2 AAC Low */

  91.     { CODEC_ID_AAC       , 104 }, /* MPEG2 AAC SSR */

  92.     { CODEC_ID_MP3       , 105 },

  93.     { CODEC_ID_MPEG1VIDEO, 106 },

  94.     { CODEC_ID_MP2       , 107 },

  95.     { CODEC_ID_MJPEG     , 108 },

  96.     { CODEC_ID_PCM_S16LE , 224 },

  97.     { CODEC_ID_VORBIS    , 225 },

  98.     { CODEC_ID_AC3       , 226 },

  99.     { CODEC_ID_PCM_ALAW  , 227 },

  100.     { CODEC_ID_PCM_MULAW , 228 },

  101.     { CODEC_ID_PCM_S16BE , 230 },

  102.     { CODEC_ID_H263      , 242 },

  103.     { CODEC_ID_H261      , 243 },

  104.     { 0, 0 },

  105. };

  106. 

  107. static const CodecTag mov_video_tags[] = {

  108. /*  { CODEC_ID_, MKTAG('c', 'v', 'i', 'd') }, *//* Cinepak */

  109. /*  { CODEC_ID_H263, MKTAG('r', 'a', 'w', ' ') }, *//* Uncompressed RGB */

  110. /*  { CODEC_ID_H263, MKTAG('Y', 'u', 'v', '2') }, *//* Uncompressed YUV422 */

  111. /*    { CODEC_ID_RAWVIDEO, MKTAG('A', 'V', 'U', 'I') }, *//* YUV with alpha-channel (AVID Uncompressed) */

  112. /* Graphics */

  113. /* Animation */

  114. /* Apple video */

  115. /* Kodak Photo CD */

  116.     { CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') }, /* PhotoJPEG */

  117.     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'e', 'g') }, /* MPEG */

  118.     { CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'a') }, /* Motion-JPEG (format A) */

  119.     { CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'b') }, /* Motion-JPEG (format B) */

  120.     { CODEC_ID_MJPEG, MKTAG('A', 'V', 'D', 'J') }, /* MJPEG with alpha-channel (AVID JFIF meridien compressed) */

  121. /*    { CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') }, *//* MJPEG with alpha-channel (AVID ABVB/Truevision NuVista) */

  122. /*    { CODEC_ID_GIF, MKTAG('g', 'i', 'f', ' ') }, *//* embedded gif files as frames (usually one "click to play movie" frame) */

  123. /* Sorenson video */

  124.     { CODEC_ID_SVQ1, MKTAG('S', 'V', 'Q', '1') }, /* Sorenson Video v1 */

  125.     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') }, /* Sorenson Video v1 */

  126.     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', 'i') }, /* Sorenson Video v1 (from QT specs)*/

  127.     { CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') }, /* Sorenson Video v3 */

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

  129.     { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') }, /* OpenDiVX *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */

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

  131.     { CODEC_ID_MPEG4, MKTAG('3', 'I', 'V', '2') }, /* experimental: 3IVX files before ivx D4 4.5.1 */

  132. /*    { CODEC_ID_, MKTAG('I', 'V', '5', '0') }, *//* Indeo 5.0 */

  133.     { CODEC_ID_H263, MKTAG('h', '2', '6', '3') }, /* H263 */

  134.     { CODEC_ID_H263, MKTAG('s', '2', '6', '3') }, /* H263 ?? works */

  135.     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') }, /* DV NTSC */

  136.     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 'p') }, /* DV PAL */

  137. /*    { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, *//* AVID dv */

  138.     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, /* On2 VP3 */

  139.     { CODEC_ID_RPZA, MKTAG('r', 'p', 'z', 'a') }, /* Apple Video (RPZA) */

  140.     { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') }, /* Cinepak */

  141.     { CODEC_ID_8BPS, MKTAG('8', 'B', 'P', 'S') }, /* Planar RGB (8BPS) */

  142.     { CODEC_ID_SMC, MKTAG('s', 'm', 'c', ' ') }, /* Apple Graphics (SMC) */

  143.     { CODEC_ID_QTRLE, MKTAG('r', 'l', 'e', ' ') }, /* Apple Animation (RLE) */

  144.     { CODEC_ID_QDRAW, MKTAG('q', 'd', 'r', 'w') }, /* QuickDraw */

  145.     { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') }, /* AVC-1/H.264 */

  146.     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '2') }, /* MPEG2 produced by Sony HD camera */

  147.     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '5', 'p') }, /* MPEG2 IMX 635/50 50mb/s produced by FCP */

  148.     { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'x', '3', 'n') }, /* MPEG2 IMX 635/50 30mb/s produced by FCP */

  149.     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'p', 'p') }, /* DVCPRO PAL produced by FCP */

  150.     //{ CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '5') }, /* DVCPRO HD produced by FCP */

  151.     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'p') }, /* DVCPRO50 produced by FCP */

  152.     { CODEC_ID_MPEG2VIDEO, MKTAG('h', 'd', 'v', '3') }, /* HDV produced by FCP */

  153.     //{ CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', '2') }, /* JPEG 2000 produced by FCP */

  154.     { CODEC_ID_NONE, 0 },

  155. };

  156. 

  157. static const CodecTag mov_audio_tags[] = {

  158.     { CODEC_ID_PCM_S24BE, MKTAG('i', 'n', '2', '4') },

  159. /*    { CODEC_ID_PCM_S16BE, MKTAG('N', 'O', 'N', 'E') }, *//* uncompressed */

  160.     { CODEC_ID_PCM_S16BE, MKTAG('t', 'w', 'o', 's') }, /* 16 bits */

  161.     /* { CODEC_ID_PCM_S8, MKTAG('t', 'w', 'o', 's') },*/ /* 8 bits */

  162.     { CODEC_ID_PCM_U8, MKTAG('r', 'a', 'w', ' ') }, /* 8 bits unsigned */

  163.     { CODEC_ID_PCM_S16LE, MKTAG('s', 'o', 'w', 't') }, /*  */

  164.     { CODEC_ID_PCM_MULAW, MKTAG('u', 'l', 'a', 'w') }, /*  */

  165.     { CODEC_ID_PCM_ALAW, MKTAG('a', 'l', 'a', 'w') }, /*  */

  166.     { CODEC_ID_ADPCM_IMA_QT, MKTAG('i', 'm', 'a', '4') }, /* IMA-4 ADPCM */

  167.     { CODEC_ID_MACE3, MKTAG('M', 'A', 'C', '3') }, /* Macintosh Audio Compression and Expansion 3:1 */

  168.     { CODEC_ID_MACE6, MKTAG('M', 'A', 'C', '6') }, /* Macintosh Audio Compression and Expansion 6:1 */

  169. 

  170.     { CODEC_ID_MP2, MKTAG('.', 'm', 'p', '3') }, /* MPEG layer 3 */ /* sample files at http://www.3ivx.com/showcase.html use this tag */

  171.     { CODEC_ID_MP2, 0x6D730055 }, /* MPEG layer 3 */

  172.     { CODEC_ID_MP2, 0x5500736D }, /* MPEG layer 3 *//* XXX: check endianness */

  173. /*    { CODEC_ID_OGG_VORBIS, MKTAG('O', 'g', 'g', 'S') }, *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */

  174. /* MP4 tags */

  175.     { CODEC_ID_AAC, MKTAG('m', 'p', '4', 'a') }, /* MPEG-4 AAC */

  176.     /* The standard for mpeg4 audio is still not normalised AFAIK anyway */

  177.     { CODEC_ID_AMR_NB, MKTAG('s', 'a', 'm', 'r') }, /* AMR-NB 3gp */

  178.     { CODEC_ID_AMR_WB, MKTAG('s', 'a', 'w', 'b') }, /* AMR-WB 3gp */

  179.     { CODEC_ID_AC3, MKTAG('m', 's', 0x20, 0x00) }, /* Dolby AC-3 */

  180.     { CODEC_ID_ALAC,MKTAG('a', 'l', 'a', 'c') }, /* Apple Lossless */

  181.     { CODEC_ID_QDM2,MKTAG('Q', 'D', 'M', '2') }, /* QDM2 */

  182.     { CODEC_ID_NONE, 0 },

  183. };

  184. 

  185. /* map numeric codes from mdhd atom to ISO 639 */

  186. /* cf. QTFileFormat.pdf p253, qtff.pdf p205 */

  187. /* http://developer.apple.com/documentation/mac/Text/Text-368.html */

  188. /* deprecated by putting the code as 3*5bit ascii */

  189. static const char *mov_mdhd_language_map[] = {

  190. /* 0-9 */

  191. "eng", "fra", "ger", "ita", "dut", "sve", "spa", "dan", "por", "nor",

  192. "heb", "jpn", "ara", "fin", "gre", "ice", "mlt", "tur", "hr "/*scr*/, "chi"/*ace?*/,

  193. "urd", "hin", "tha", "kor", "lit", "pol", "hun", "est", "lav",  NULL,

  194. "fo ",  NULL, "rus", "chi",  NULL, "iri", "alb", "ron", "ces", "slk",

  195. "slv", "yid", "sr ", "mac", "bul", "ukr", "bel", "uzb", "kaz", "aze",

  196. /*?*/

  197. "aze", "arm", "geo", "mol", "kir", "tgk", "tuk", "mon",  NULL, "pus",

  198. "kur", "kas", "snd", "tib", "nep", "san", "mar", "ben", "asm", "guj",

  199. "pa ", "ori", "mal", "kan", "tam", "tel",  NULL, "bur", "khm", "lao",

  200. /*                   roman? arabic? */

  201. "vie", "ind", "tgl", "may", "may", "amh", "tir", "orm", "som", "swa",

  202. /*==rundi?*/

  203.  NULL, "run",  NULL, "mlg", "epo",  NULL,  NULL,  NULL,  NULL,  NULL,

  204. /* 100 */

  205.  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,

  206.  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,

  207.  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL, "wel", "baq",

  208. "cat", "lat", "que", "grn", "aym", "tat", "uig", "dzo", "jav"

  209. };

  210. 

  211. /* the QuickTime file format is quite convoluted...

  212.  * it has lots of index tables, each indexing something in another one...

  213.  * Here we just use what is needed to read the chunks

  214.  */

  215. 

  216. typedef struct MOV_sample_to_chunk_tbl {

  217.     long first;

  218.     long count;

  219.     long id;

  220. } MOV_sample_to_chunk_tbl;

  221. 

  222. typedef struct {

  223.     uint32_t type;

  224.     int64_t offset;

  225.     int64_t size; /* total size (excluding the size and type fields) */

  226. } MOV_atom_t;

  227. 

  228. typedef struct {

  229.     int seed;

  230.     int flags;

  231.     int size;

  232.     void* clrs;

  233. } MOV_ctab_t;

  234. 

  235. typedef struct {

  236.     uint8_t  version;

  237.     uint32_t flags; // 24bit

  238. 

  239.     /* 0x03 ESDescrTag */

  240.     uint16_t es_id;

  241. #define MP4ODescrTag                    0x01

  242. #define MP4IODescrTag                   0x02

  243. #define MP4ESDescrTag                   0x03

  244. #define MP4DecConfigDescrTag            0x04

  245. #define MP4DecSpecificDescrTag          0x05

  246. #define MP4SLConfigDescrTag             0x06

  247. #define MP4ContentIdDescrTag            0x07

  248. #define MP4SupplContentIdDescrTag       0x08

  249. #define MP4IPIPtrDescrTag               0x09

  250. #define MP4IPMPPtrDescrTag              0x0A

  251. #define MP4IPMPDescrTag                 0x0B

  252. #define MP4RegistrationDescrTag         0x0D

  253. #define MP4ESIDIncDescrTag              0x0E

  254. #define MP4ESIDRefDescrTag              0x0F

  255. #define MP4FileIODescrTag               0x10

  256. #define MP4FileODescrTag                0x11

  257. #define MP4ExtProfileLevelDescrTag      0x13

  258. #define MP4ExtDescrTagsStart            0x80

  259. #define MP4ExtDescrTagsEnd              0xFE

  260.     uint8_t  stream_priority;

  261. 

  262.     /* 0x04 DecConfigDescrTag */

  263.     uint8_t  object_type_id;

  264.     uint8_t  stream_type;

  265.     /* XXX: really streamType is

  266.      * only 6bit, followed by:

  267.      * 1bit  upStream

  268.      * 1bit  reserved

  269.      */

  270.     uint32_t buffer_size_db; // 24

  271.     uint32_t max_bitrate;

  272.     uint32_t avg_bitrate;

  273. 

  274.     /* 0x05 DecSpecificDescrTag */

  275.     uint8_t  decoder_cfg_len;

  276.     uint8_t *decoder_cfg;

  277. 

  278.     /* 0x06 SLConfigDescrTag */

  279.     uint8_t  sl_config_len;

  280.     uint8_t *sl_config;

  281. } MOV_esds_t;

  282. 

  283. struct MOVParseTableEntry;

  284. 

  285. typedef struct Time2Sample{

  286.     int count;

  287.     int duration;

  288. }Time2Sample;

  289. 

  290. typedef struct MOVStreamContext {

  291.     int ffindex; /* the ffmpeg stream id */

  292.     int is_ff_stream; /* Is this stream presented to ffmpeg ? i.e. is this an audio or video stream ? */

  293.     long next_chunk;

  294.     long chunk_count;

  295.     int64_t *chunk_offsets;

  296.     int stts_count;

  297.     Time2Sample *stts_data;

  298.     int ctts_count;

  299.     Time2Sample *ctts_data;

  300.     int edit_count;             /* number of 'edit' (elst atom) */

  301.     long sample_to_chunk_sz;

  302.     MOV_sample_to_chunk_tbl *sample_to_chunk;

  303.     long sample_to_chunk_index;

  304.     int sample_to_time_index;

  305.     long sample_to_time_sample;

  306.     uint64_t sample_to_time_time;

  307.     int sample_to_ctime_index;

  308.     int sample_to_ctime_sample;

  309.     long sample_size;

  310.     long sample_count;

  311.     long *sample_sizes;

  312.     long keyframe_count;

  313.     long *keyframes;

  314.     int time_scale;

  315.     int time_rate;

  316.     long current_sample;

  317.     long left_in_chunk; /* how many samples before next chunk */

  318.     MOV_esds_t esds;

  319. } MOVStreamContext;

  320. 

  321. typedef struct MOVContext {

  322.     int mp4; /* set to 1 as soon as we are sure that the file is an .mp4 file (even some header parsing depends on this) */

  323.     AVFormatContext *fc;

  324.     int time_scale;

  325.     int duration; /* duration of the longest track */

  326.     int found_moov; /* when both 'moov' and 'mdat' sections has been found */

  327.     int found_mdat; /* we suppose we have enough data to read the file */

  328.     int64_t mdat_size;

  329.     int64_t mdat_offset;

  330.     int ni;                                         ///< non interleaved mode

  331.     int total_streams;

  332.     /* some streams listed here aren't presented to the ffmpeg API, since they aren't either video nor audio

  333.      * but we need the info to be able to skip data from those streams in the 'mdat' section

  334.      */

  335.     MOVStreamContext *streams[MAX_STREAMS];

  336. 

  337.     int64_t next_chunk_offset;

  338.     MOVStreamContext *partial; /* != 0 : there is still to read in the current chunk */

  339.     int ctab_size;

  340.     MOV_ctab_t **ctab;           /* color tables */

  341.     const struct MOVParseTableEntry *parse_table; /* could be eventually used to change the table */

  342.     /* NOTE: for recursion save to/ restore from local variable! */

  343. 

  344.     AVPaletteControl palette_control;

  345. } MOVContext;

  346. 

  347. 

  348. /* XXX: it's the first time I make a recursive parser I think... sorry if it's ugly :P */

  349. 

  350. /* those functions parse an atom */

  351. /* return code:

  352.  1: found what I wanted, exit

  353.  0: continue to parse next atom

  354.  -1: error occured, exit

  355.  */

  356. typedef int (*mov_parse_function)(MOVContext *ctx, ByteIOContext *pb, MOV_atom_t atom);

  357. 

  358. /* links atom IDs to parse functions */

  359. typedef struct MOVParseTableEntry {

  360.     uint32_t type;

  361.     mov_parse_function func;

  362. } MOVParseTableEntry;

  363. 

  364. static int ff_mov_lang_to_iso639(int code, char *to)

  365. {

  366.     int i;

  367.     /* is it the mangled iso code? */

  368.     /* see http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt */

  369.     if (code > 138) {

  370.         for (i = 2; i >= 0; i--) {

  371.             to[i] = 0x60 + (code & 0x1f);

  372.             code >>= 5;

  373.         }

  374.         return 1;

  375.     }

  376.     /* old fashion apple lang code */

  377.     if (code >= (sizeof(mov_mdhd_language_map)/sizeof(char *)))

  378.         return 0;

  379.     if (!mov_mdhd_language_map[code])

  380.         return 0;

  381.     strncpy(to, mov_mdhd_language_map[code], 4);

  382.     return 1;

  383. }

  384. 

  385. extern int ff_mov_iso639_to_lang(const char *lang, int mp4); /* for movenc.c */

  386. int ff_mov_iso639_to_lang(const char *lang, int mp4)

  387. {

  388.     int i, code = 0;

  389. 

  390.     /* old way, only for QT? */

  391.     for (i = 0; !mp4 && (i < (sizeof(mov_mdhd_language_map)/sizeof(char *))); i++) {

  392.         if (mov_mdhd_language_map[i] && !strcmp(lang, mov_mdhd_language_map[i]))

  393.             return i;

  394.     }

  395.     /* XXX:can we do that in mov too? */

  396.     if (!mp4)

  397.         return 0;

  398.     /* handle undefined as such */

  399.     if (lang[0] == '\0')

  400.         lang = "und";

  401.     /* 5bit ascii */

  402.     for (i = 0; i < 3; i++) {

  403.         unsigned char c = (unsigned char)lang[i];

  404.         if (c < 0x60)

  405.             return 0;

  406.         if (c > 0x60 + 0x1f)

  407.             return 0;

  408.         code <<= 5;

  409.         code |= (c - 0x60);

  410.     }

  411.     return code;

  412. }

  413. 

  414. static int mov_read_leaf(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  415. {

  416.     if (atom.size>1)

  417.         url_fskip(pb, atom.size);

  418. /*        url_seek(pb, atom_offset+atom.size, SEEK_SET); */

  419.     return 0;

  420. }

  421. 

  422. static int mov_read_default(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  423. {

  424.     int64_t total_size = 0;

  425.     MOV_atom_t a;

  426.     int i;

  427.     int err = 0;

  428. 

  429.     a.offset = atom.offset;

  430. 

  431.     if (atom.size < 0)

  432.         atom.size = 0x7fffffffffffffffLL;

  433.     while(((total_size + 8) < atom.size) && !url_feof(pb) && !err) {

  434.         a.size = atom.size;

  435.         a.type=0L;

  436.         if(atom.size >= 8) {

  437.             a.size = get_be32(pb);

  438.             a.type = get_le32(pb);

  439.         }

  440.         total_size += 8;

  441.         a.offset += 8;

  442.         dprintf("type: %08x  %.4s  sz: %Lx  %Lx   %Lx\n", a.type, (char*)&a.type, a.size, atom.size, total_size);

  443.         if (a.size == 1) { /* 64 bit extended size */

  444.             a.size = get_be64(pb) - 8;

  445.             a.offset += 8;

  446.             total_size += 8;

  447.         }

  448.         if (a.size == 0) {

  449.             a.size = atom.size - total_size;

  450.             if (a.size <= 8)

  451.                 break;

  452.         }

  453.         for (i = 0; c->parse_table[i].type != 0L

  454.              && c->parse_table[i].type != a.type; i++)

  455.             /* empty */;

  456. 

  457.         a.size -= 8;

  458. 

  459.         if(a.size < 0)

  460.             break;

  461. 

  462.         if (c->parse_table[i].type == 0) { /* skip leaf atoms data */

  463.             url_fskip(pb, a.size);

  464.         } else {

  465.             err = (c->parse_table[i].func)(c, pb, a);

  466.         }

  467. 

  468.         a.offset += a.size;

  469.         total_size += a.size;

  470.     }

  471. 

  472.     if (!err && total_size < atom.size && atom.size < 0x7ffff) {

  473.         url_fskip(pb, atom.size - total_size);

  474.     }

  475. 

  476.     return err;

  477. }

  478. 

  479. static int mov_read_ctab(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  480. {

  481. #if 1

  482.     url_fskip(pb, atom.size); // for now

  483. #else

  484.     VERY VERY BROKEN, NEVER execute this, needs rewrite

  485.     unsigned int len;

  486.     MOV_ctab_t *t;

  487.     c->ctab = av_realloc(c->ctab, ++c->ctab_size);

  488.     t = c->ctab[c->ctab_size];

  489.     t->seed = get_be32(pb);

  490.     t->flags = get_be16(pb);

  491.     t->size = get_be16(pb) + 1;

  492.     len = 2 * t->size * 4;

  493.     if (len > 0) {

  494.         t->clrs = av_malloc(len); // 16bit A R G B

  495.         if (t->clrs)

  496.             get_buffer(pb, t->clrs, len);

  497.     }

  498. #endif

  499. 

  500.     return 0;

  501. }

  502. 

  503. static int mov_read_hdlr(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  504. {

  505.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  506.     int len = 0;

  507.     uint32_t type;

  508.     uint32_t ctype;

  509. 

  510.     get_byte(pb); /* version */

  511.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  512. 

  513.     /* component type */

  514.     ctype = get_le32(pb);

  515.     type = get_le32(pb); /* component subtype */

  516. 

  517.     dprintf("ctype= %c%c%c%c (0x%08lx)\n", *((char *)&ctype), ((char *)&ctype)[1], ((char *)&ctype)[2], ((char *)&ctype)[3], (long) ctype);

  518.     dprintf("stype= %c%c%c%c\n", *((char *)&type), ((char *)&type)[1], ((char *)&type)[2], ((char *)&type)[3]);

  519.     if(ctype == MKTAG('m', 'h', 'l', 'r')) { /* MOV */

  520.         /* helps parsing the string hereafter... */

  521.         c->mp4 = 0;

  522.         if(type == MKTAG('v', 'i', 'd', 'e'))

  523.             st->codec->codec_type = CODEC_TYPE_VIDEO;

  524.         else if(type == MKTAG('s', 'o', 'u', 'n'))

  525.             st->codec->codec_type = CODEC_TYPE_AUDIO;

  526.     } else if(ctype == 0) { /* MP4 */

  527.         /* helps parsing the string hereafter... */

  528.         c->mp4 = 1;

  529.         if(type == MKTAG('v', 'i', 'd', 'e'))

  530.             st->codec->codec_type = CODEC_TYPE_VIDEO;

  531.         else if(type == MKTAG('s', 'o', 'u', 'n'))

  532.             st->codec->codec_type = CODEC_TYPE_AUDIO;

  533.     }

  534.     get_be32(pb); /* component  manufacture */

  535.     get_be32(pb); /* component flags */

  536.     get_be32(pb); /* component flags mask */

  537. 

  538.     if(atom.size <= 24)

  539.         return 0; /* nothing left to read */

  540.     /* XXX: MP4 uses a C string, not a pascal one */

  541.     /* component name */

  542. 

  543.     if(c->mp4) {

  544.         /* .mp4: C string */

  545.         while(get_byte(pb) && (++len < (atom.size - 24)));

  546.     } else {

  547.         /* .mov: PASCAL string */

  548.         len = get_byte(pb);

  549.         url_fskip(pb, len);

  550.     }

  551. 

  552.     url_fskip(pb, atom.size - (url_ftell(pb) - atom.offset));

  553.     return 0;

  554. }

  555. 

  556. static int mov_mp4_read_descr_len(ByteIOContext *pb)

  557. {

  558.     int len = 0;

  559.     int count = 4;

  560.     while (count--) {

  561.         int c = get_byte(pb);

  562.         len = (len << 7) | (c & 0x7f);

  563.         if (!(c & 0x80))

  564.             break;

  565.     }

  566.     return len;

  567. }

  568. 

  569. static int mov_mp4_read_descr(ByteIOContext *pb, int *tag)

  570. {

  571.     int len;

  572.     *tag = get_byte(pb);

  573.     len = mov_mp4_read_descr_len(pb);

  574.     dprintf("MPEG4 description: tag=0x%02x len=%d\n", *tag, len);

  575.     return len;

  576. }

  577. 

  578. static int mov_read_esds(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  579. {

  580.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  581.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  582.     int64_t start_pos = url_ftell(pb);

  583.     int tag, len;

  584. 

  585.     /* Well, broken but suffisant for some MP4 streams */

  586.     get_be32(pb); /* version + flags */

  587.     len = mov_mp4_read_descr(pb, &tag);

  588.     if (tag == MP4ESDescrTag) {

  589.         get_be16(pb); /* ID */

  590.         get_byte(pb); /* priority */

  591.     } else

  592.         get_be16(pb); /* ID */

  593. 

  594.     len = mov_mp4_read_descr(pb, &tag);

  595.     if (tag == MP4DecConfigDescrTag) {

  596.         sc->esds.object_type_id = get_byte(pb);

  597.         sc->esds.stream_type = get_byte(pb);

  598.         sc->esds.buffer_size_db = get_be24(pb);

  599.         sc->esds.max_bitrate = get_be32(pb);

  600.         sc->esds.avg_bitrate = get_be32(pb);

  601. 

  602.         st->codec->codec_id= codec_get_id(ff_mov_obj_type, sc->esds.object_type_id);

  603.         len = mov_mp4_read_descr(pb, &tag);

  604.         if (tag == MP4DecSpecificDescrTag) {

  605.             dprintf("Specific MPEG4 header len=%d\n", len);

  606.             st->codec->extradata = (uint8_t*) av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);

  607.             if (st->codec->extradata) {

  608.                 get_buffer(pb, st->codec->extradata, len);

  609.                 st->codec->extradata_size = len;

  610.             }

  611.         }

  612.     }

  613.     /* in any case, skip garbage */

  614.     url_fskip(pb, atom.size - ((url_ftell(pb) - start_pos)));

  615.     return 0;

  616. }

  617. 

  618. /* this atom contains actual media data */

  619. static int mov_read_mdat(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  620. {

  621.     if(atom.size == 0) /* wrong one (MP4) */

  622.         return 0;

  623.     c->found_mdat=1;

  624.     c->mdat_offset = atom.offset;

  625.     c->mdat_size = atom.size;

  626.     if(c->found_moov)

  627.         return 1; /* found both, just go */

  628.     url_fskip(pb, atom.size);

  629.     return 0; /* now go for moov */

  630. }

  631. 

  632. /* this atom should contain all header atoms */

  633. static int mov_read_moov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  634. {

  635.     int err;

  636. 

  637.     err = mov_read_default(c, pb, atom);

  638.     /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */

  639.     /* so we don't parse the whole file if over a network */

  640.     c->found_moov=1;

  641.     if(c->found_mdat)

  642.         return 1; /* found both, just go */

  643.     return 0; /* now go for mdat */

  644. }

  645. 

  646. 

  647. static int mov_read_mdhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  648. {

  649.     int version;

  650.     int lang;

  651. 

  652.     version = get_byte(pb); /* version */

  653.     if (version > 1)

  654.         return 1; /* unsupported */

  655. 

  656.     get_byte(pb); get_byte(pb);

  657.     get_byte(pb); /* flags */

  658. 

  659.     (version==1)?get_be64(pb):get_be32(pb); /* creation time */

  660.     (version==1)?get_be64(pb):get_be32(pb); /* modification time */

  661. 

  662.     c->streams[c->fc->nb_streams-1]->time_scale = get_be32(pb);

  663.     c->fc->streams[c->fc->nb_streams-1]->duration = (version==1)?get_be64(pb):get_be32(pb); /* duration */

  664. 

  665.     lang = get_be16(pb); /* language */

  666.     ff_mov_lang_to_iso639(lang, c->fc->streams[c->fc->nb_streams-1]->language);

  667.     get_be16(pb); /* quality */

  668. 

  669.     return 0;

  670. }

  671. 

  672. static int mov_read_mvhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  673. {

  674.     get_byte(pb); /* version */

  675.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  676. 

  677.     get_be32(pb); /* creation time */

  678.     get_be32(pb); /* modification time */

  679.     c->time_scale = get_be32(pb); /* time scale */

  680. #ifdef DEBUG

  681.     av_log(NULL, AV_LOG_DEBUG, "time scale = %i\n", c->time_scale);

  682. #endif

  683.     c->duration = get_be32(pb); /* duration */

  684.     get_be32(pb); /* preferred scale */

  685. 

  686.     get_be16(pb); /* preferred volume */

  687. 

  688.     url_fskip(pb, 10); /* reserved */

  689. 

  690.     url_fskip(pb, 36); /* display matrix */

  691. 

  692.     get_be32(pb); /* preview time */

  693.     get_be32(pb); /* preview duration */

  694.     get_be32(pb); /* poster time */

  695.     get_be32(pb); /* selection time */

  696.     get_be32(pb); /* selection duration */

  697.     get_be32(pb); /* current time */

  698.     get_be32(pb); /* next track ID */

  699. 

  700.     return 0;

  701. }

  702. 

  703. static int mov_read_smi(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  704. {

  705.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  706. 

  707.     if((uint64_t)atom.size > (1<<30))

  708.         return -1;

  709. 

  710.     // currently SVQ3 decoder expect full STSD header - so let's fake it

  711.     // this should be fixed and just SMI header should be passed

  712.     av_free(st->codec->extradata);

  713.     st->codec->extradata_size = 0x5a + atom.size;

  714.     st->codec->extradata = (uint8_t*) av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  715. 

  716.     if (st->codec->extradata) {

  717.         strcpy(st->codec->extradata, "SVQ3"); // fake

  718.         get_buffer(pb, st->codec->extradata + 0x5a, atom.size);

  719.         dprintf("Reading SMI %Ld  %s\n", atom.size, (char*)st->codec->extradata + 0x5a);

  720.     } else

  721.         url_fskip(pb, atom.size);

  722. 

  723.     return 0;

  724. }

  725. 

  726. static int mov_read_wave(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  727. {

  728.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  729. 

  730.     if((uint64_t)atom.size > (1<<30))

  731.         return -1;

  732. 

  733.     if (st->codec->codec_id == CODEC_ID_QDM2) {

  734.         // pass all frma atom to codec, needed at least for QDM2

  735.         av_free(st->codec->extradata);

  736.         st->codec->extradata_size = atom.size;

  737.         st->codec->extradata = (uint8_t*) av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  738. 

  739.         if (st->codec->extradata) {

  740.             get_buffer(pb, st->codec->extradata, atom.size);

  741.         } else

  742.             url_fskip(pb, atom.size);

  743.     } else if (atom.size > 8) { /* to read frma, esds atoms */

  744.         mov_read_default(c, pb, atom);

  745.     } else if (atom.size > 0)

  746.         url_fskip(pb, atom.size);

  747.     return 0;

  748. }

  749. 

  750. static int mov_read_avcC(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  751. {

  752.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  753. 

  754.     if((uint64_t)atom.size > (1<<30))

  755.         return -1;

  756. 

  757.     av_free(st->codec->extradata);

  758. 

  759.     st->codec->extradata_size = atom.size;

  760.     st->codec->extradata = (uint8_t*) av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  761. 

  762.     if (st->codec->extradata) {

  763.         get_buffer(pb, st->codec->extradata, atom.size);

  764.     } else

  765.         url_fskip(pb, atom.size);

  766. 

  767.     return 0;

  768. }

  769. 

  770. static int mov_read_stco(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  771. {

  772.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  773.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  774.     unsigned int i, entries;

  775. 

  776.     get_byte(pb); /* version */

  777.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  778. 

  779.     entries = get_be32(pb);

  780. 

  781.     if(entries >= UINT_MAX/sizeof(int64_t))

  782.         return -1;

  783. 

  784.     sc->chunk_count = entries;

  785.     sc->chunk_offsets = (int64_t*) av_malloc(entries * sizeof(int64_t));

  786.     if (!sc->chunk_offsets)

  787.         return -1;

  788.     if (atom.type == MKTAG('s', 't', 'c', 'o')) {

  789.         for(i=0; i<entries; i++) {

  790.             sc->chunk_offsets[i] = get_be32(pb);

  791.         }

  792.     } else if (atom.type == MKTAG('c', 'o', '6', '4')) {

  793.         for(i=0; i<entries; i++) {

  794.             sc->chunk_offsets[i] = get_be64(pb);

  795.         }

  796.     } else

  797.         return -1;

  798. 

  799.     for(i=0; i<c->fc->nb_streams; i++){

  800.         MOVStreamContext *sc2 = (MOVStreamContext *)c->fc->streams[i]->priv_data;

  801.         if(sc2 && sc2->chunk_offsets){

  802.             int64_t first= sc2->chunk_offsets[0];

  803.             int64_t last= sc2->chunk_offsets[sc2->chunk_count-1];

  804.             if(first >= sc->chunk_offsets[entries-1] || last <= sc->chunk_offsets[0])

  805.                 c->ni=1;

  806.         }

  807.     }

  808.     return 0;

  809. }

  810. 

  811. static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  812. {

  813.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  814.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  815.     int entries, frames_per_sample;

  816.     uint32_t format;

  817.     uint8_t codec_name[32];

  818. 

  819.     /* for palette traversal */

  820.     int color_depth;

  821.     int color_start;

  822.     int color_count;

  823.     int color_end;

  824.     int color_index;

  825.     int color_dec;

  826.     int color_greyscale;

  827.     unsigned char *color_table;

  828.     int j;

  829.     unsigned char r, g, b;

  830. 

  831.     get_byte(pb); /* version */

  832.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  833. 

  834.     entries = get_be32(pb);

  835. 

  836.     while(entries--) { //Parsing Sample description table

  837.         enum CodecID id;

  838.         offset_t start_pos = url_ftell(pb);

  839.         int size = get_be32(pb); /* size */

  840.         format = get_le32(pb); /* data format */

  841. 

  842.         get_be32(pb); /* reserved */

  843.         get_be16(pb); /* reserved */

  844.         get_be16(pb); /* index */

  845. 

  846.         /* for MPEG4: set codec type by looking for it */

  847.         id = codec_get_id(mov_video_tags, format);

  848.         if(id <= 0)

  849.             id = codec_get_id(codec_bmp_tags, format);

  850.         if (id >= 0) {

  851.             AVCodec *codec;

  852.             codec = avcodec_find_decoder(id);

  853.             if (codec)

  854.                 st->codec->codec_type = codec->type;

  855.         }

  856.         dprintf("size=%d 4CC= %c%c%c%c codec_type=%d\n",

  857.                 size,

  858.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff, (format >> 24) & 0xff,

  859.                 st->codec->codec_type);

  860.         st->codec->codec_tag = format;

  861.         if(st->codec->codec_type==CODEC_TYPE_VIDEO) {

  862.             MOV_atom_t a = { 0, 0, 0 };

  863.             st->codec->codec_id = id;

  864.             get_be16(pb); /* version */

  865.             get_be16(pb); /* revision level */

  866.             get_be32(pb); /* vendor */

  867.             get_be32(pb); /* temporal quality */

  868.             get_be32(pb); /* spacial quality */

  869.             if(st->codec->codec_id == CODEC_ID_MPEG4){ //FIXME this is silly

  870.                 get_be16(pb);

  871.                 get_be16(pb);

  872.             }else{

  873.                 st->codec->width = get_be16(pb); /* width */

  874.                 st->codec->height = get_be16(pb); /* height */

  875.             }

  876.             get_be32(pb); /* horiz resolution */

  877.             get_be32(pb); /* vert resolution */

  878.             get_be32(pb); /* data size, always 0 */

  879.             frames_per_sample = get_be16(pb); /* frames per samples */

  880. #ifdef DEBUG

  881.             av_log(NULL, AV_LOG_DEBUG, "frames/samples = %d\n", frames_per_sample);

  882. #endif

  883.         get_buffer(pb, codec_name, 32); /* codec name, pascal string (FIXME: true for mp4?) */

  884.         if (codec_name[0] <= 31) {

  885.             memcpy(st->codec->codec_name, &codec_name[1],codec_name[0]);

  886.             st->codec->codec_name[codec_name[0]] = 0;

  887.         }

  888. 

  889.             st->codec->bits_per_sample = get_be16(pb); /* depth */

  890.             st->codec->color_table_id = get_be16(pb); /* colortable id */

  891. 

  892. /*          These are set in mov_read_stts and might already be set!

  893.             st->codec->time_base.den      = 25;

  894.             st->codec->time_base.num = 1;

  895. */

  896. 

  897.             /* figure out the palette situation */

  898.             color_depth = st->codec->bits_per_sample & 0x1F;

  899.             color_greyscale = st->codec->bits_per_sample & 0x20;

  900. 

  901.             /* if the depth is 2, 4, or 8 bpp, file is palettized */

  902.             if ((color_depth == 2) || (color_depth == 4) ||

  903.                 (color_depth == 8)) {

  904. 

  905.                 if (color_greyscale) {

  906. 

  907.                     /* compute the greyscale palette */

  908.                     color_count = 1 << color_depth;

  909.                     color_index = 255;

  910.                     color_dec = 256 / (color_count - 1);

  911.                     for (j = 0; j < color_count; j++) {

  912.                         r = g = b = color_index;

  913.                         c->palette_control.palette[j] =

  914.                             (r << 16) | (g << 8) | (b);

  915.                         color_index -= color_dec;

  916.                         if (color_index < 0)

  917.                             color_index = 0;

  918.                     }

  919. 

  920.                 } else if (st->codec->color_table_id & 0x08) {

  921. 

  922.                     /* if flag bit 3 is set, use the default palette */

  923.                     color_count = 1 << color_depth;

  924.                     if (color_depth == 2)

  925.                         color_table = ff_qt_default_palette_4;

  926.                     else if (color_depth == 4)

  927.                         color_table = ff_qt_default_palette_16;

  928.                     else

  929.                         color_table = ff_qt_default_palette_256;

  930. 

  931.                     for (j = 0; j < color_count; j++) {

  932.                         r = color_table[j * 4 + 0];

  933.                         g = color_table[j * 4 + 1];

  934.                         b = color_table[j * 4 + 2];

  935.                         c->palette_control.palette[j] =

  936.                             (r << 16) | (g << 8) | (b);

  937.                     }

  938. 

  939.                 } else {

  940. 

  941.                     /* load the palette from the file */

  942.                     color_start = get_be32(pb);

  943.                     color_count = get_be16(pb);

  944.                     color_end = get_be16(pb);

  945.                     for (j = color_start; j <= color_end; j++) {

  946.                         /* each R, G, or B component is 16 bits;

  947.                          * only use the top 8 bits; skip alpha bytes

  948.                          * up front */

  949.                         get_byte(pb);

  950.                         get_byte(pb);

  951.                         r = get_byte(pb);

  952.                         get_byte(pb);

  953.                         g = get_byte(pb);

  954.                         get_byte(pb);

  955.                         b = get_byte(pb);

  956.                         get_byte(pb);

  957.                         c->palette_control.palette[j] =

  958.                             (r << 16) | (g << 8) | (b);

  959.                     }

  960.                 }

  961. 

  962.                 st->codec->palctrl = &c->palette_control;

  963.                 st->codec->palctrl->palette_changed = 1;

  964.             } else

  965.                 st->codec->palctrl = NULL;

  966. 

  967.             a.size = size - (url_ftell(pb) - start_pos);

  968.             if (a.size > 8)

  969.                 mov_read_default(c, pb, a);

  970.             else if (a.size > 0)

  971.                 url_fskip(pb, a.size);

  972.         } else {

  973.             st->codec->codec_id = codec_get_id(mov_audio_tags, format);

  974.             if(st->codec->codec_id==CODEC_ID_AMR_NB || st->codec->codec_id==CODEC_ID_AMR_WB) //from TS26.244

  975.             {

  976.                dprintf("AMR audio identified %d!!\n", st->codec->codec_id);

  977.                get_be32(pb);get_be32(pb); //Reserved_8

  978.                get_be16(pb);//Reserved_2

  979.                get_be16(pb);//Reserved_2

  980.                get_be32(pb);//Reserved_4

  981.                get_be16(pb);//TimeScale

  982.                get_be16(pb);//Reserved_2

  983. 

  984.                 //AMRSpecificBox.(10 bytes)

  985. 

  986.                get_be32(pb); //size

  987.                get_be32(pb); //type=='damr'

  988.                get_be32(pb); //vendor

  989.                get_byte(pb); //decoder version

  990.                get_be16(pb); //mode_set

  991.                get_byte(pb); //mode_change_period

  992.                get_byte(pb); //frames_per_sample

  993. 

  994.                st->duration = AV_NOPTS_VALUE;//Not possible to get from this info, must count number of AMR frames

  995.                if(st->codec->codec_id==CODEC_ID_AMR_NB)

  996.                {

  997.                    st->codec->sample_rate=8000;

  998.                    st->codec->channels=1;

  999.                }

  1000.                else //AMR-WB

  1001.                {

  1002.                    st->codec->sample_rate=16000;

  1003.                    st->codec->channels=1;

  1004.                }

  1005.                st->codec->bits_per_sample=16;

  1006.                st->codec->bit_rate=0; /*It is not possible to tell this before we have

  1007.                                        an audio frame and even then every frame can be different*/

  1008.             }

  1009.             else if( st->codec->codec_tag == MKTAG( 'm', 'p', '4', 's' ))

  1010.             {

  1011.                 //This is some stuff for the hint track, lets ignore it!

  1012.                 //Do some mp4 auto detect.

  1013.                 c->mp4=1;

  1014.                 size-=(16);

  1015.                 url_fskip(pb, size); /* The mp4s atom also contians a esds atom that we can skip*/

  1016.             }

  1017.             else if( st->codec->codec_tag == MKTAG( 'm', 'p', '4', 'a' ))

  1018.             {

  1019.                 MOV_atom_t a;

  1020.                 int mp4_version;

  1021. 

  1022.                 /* Handle mp4 audio tag */

  1023.                 mp4_version=get_be16(pb);/*version*/

  1024.                 get_be16(pb); /*revesion*/

  1025.                 get_be32(pb);

  1026.                 st->codec->channels = get_be16(pb); /* channels */

  1027.                 st->codec->bits_per_sample = get_be16(pb); /* bits per sample */

  1028.                 get_be32(pb);

  1029.                 st->codec->sample_rate = get_be16(pb); /* sample rate, not always correct */

  1030.                 if(st->codec->sample_rate == 1) //nonsese rate? -> ignore

  1031.                     st->codec->sample_rate= 0;

  1032. 

  1033.                 get_be16(pb);

  1034.                 c->mp4=1;

  1035. 

  1036.                 if(mp4_version==1)

  1037.                 {

  1038.                     url_fskip(pb,16);

  1039.                     a.size=size-(16+20+16);

  1040.                 }

  1041.                 else

  1042.                     a.size=size-(16+20);

  1043. 

  1044.                 a.offset=url_ftell(pb);

  1045. 

  1046.                 mov_read_default(c, pb, a);

  1047. 

  1048.                 /* Get correct sample rate from extradata */

  1049.                 if(st->codec->extradata_size) {

  1050.                    const int samplerate_table[] = {

  1051.                      96000, 88200, 64000, 48000, 44100, 32000,

  1052.                      24000, 22050, 16000, 12000, 11025, 8000,

  1053.                      7350, 0, 0, 0

  1054.                    };

  1055.                    unsigned char *px = st->codec->extradata;

  1056.                    // 5 bits objectTypeIndex, 4 bits sampleRateIndex, 4 bits channels

  1057.                    int samplerate_index = ((px[0] & 7) << 1) + ((px[1] >> 7) & 1);

  1058.                    st->codec->sample_rate = samplerate_table[samplerate_index];

  1059.                    st->codec->channels = (px[1] >> 3) & 15;

  1060.                 }

  1061.             }

  1062.             else if( st->codec->codec_tag == MKTAG( 'a', 'l', 'a', 'c' ))

  1063.             {

  1064.                 /* Handle alac audio tag + special extradata */

  1065.                 get_be32(pb); /* version */

  1066.                 get_be32(pb);

  1067.                 st->codec->channels = get_be16(pb); /* channels */

  1068.                 st->codec->bits_per_sample = get_be16(pb); /* bits per sample */

  1069.                 get_be32(pb);

  1070.                 st->codec->sample_rate = get_be16(pb);

  1071.                 get_be16(pb);

  1072. 

  1073.                 /* fetch the 36-byte extradata needed for alac decoding */

  1074.                 st->codec->extradata_size = 36;

  1075.                 st->codec->extradata = (uint8_t*)

  1076.                     av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1077.                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

  1078.             }

  1079.             else if(size>=(16+20))

  1080.             {//16 bytes read, reading atleast 20 more

  1081.                 uint16_t version;

  1082.                 version = get_be16(pb); /* version */

  1083.                 get_be16(pb); /* revision level */

  1084.                 get_be32(pb); /* vendor */

  1085. 

  1086.                 st->codec->channels = get_be16(pb);             /* channel count */

  1087.                 st->codec->bits_per_sample = get_be16(pb);      /* sample size */

  1088. 

  1089.                 /* handle specific s8 codec */

  1090.                 get_be16(pb); /* compression id = 0*/

  1091.                 get_be16(pb); /* packet size = 0 */

  1092. 

  1093.                 st->codec->sample_rate = ((get_be32(pb) >> 16));

  1094. 

  1095.                 switch (st->codec->codec_id) {

  1096.                 case CODEC_ID_PCM_S16BE:

  1097.                     if (st->codec->bits_per_sample == 8)

  1098.                         st->codec->codec_id = CODEC_ID_PCM_S8;

  1099.                     /* fall */

  1100.                 case CODEC_ID_PCM_U8:

  1101.                     st->codec->bit_rate = st->codec->sample_rate * 8;

  1102.                     break;

  1103.                 default:

  1104.                     ;

  1105.                 }

  1106. 

  1107.                 //Read QT version 1 fields. In version 0 theese dont exist

  1108.                 dprintf("version =%d mp4=%d\n",version,c->mp4);

  1109.                 if((version==1) && size>=(16+20+16))

  1110.                 {

  1111.                     get_be32(pb); /* samples per packet */

  1112.                     get_be32(pb); /* bytes per packet */

  1113.                     get_be32(pb); /* bytes per frame */

  1114.                     get_be32(pb); /* bytes per sample */

  1115.                     if(size>(16+20+16))

  1116.                     {

  1117.                         //Optional, additional atom-based fields

  1118.                         MOV_atom_t a = { format, url_ftell(pb), size - (16 + 20 + 16 + 8) };

  1119.                         mov_read_default(c, pb, a);

  1120.                     }

  1121.                 }

  1122.                 else

  1123.                 {

  1124.                     //We should be down to 0 bytes here, but lets make sure.

  1125.                     size-=(16+20);

  1126.                     if(size>0) {

  1127.                         dprintf("skipping 0x%X bytes\n",size-(16+20));

  1128.                         url_fskip(pb, size);

  1129.                     }

  1130.                 }

  1131.             }

  1132.             else

  1133.             {

  1134.                 size-=16;

  1135.                 //Unknown size, but lets do our best and skip the rest.

  1136.                 dprintf("Strange size, skipping 0x%X bytes\n",size);

  1137.                 url_fskip(pb, size);

  1138.             }

  1139.         }

  1140.     }

  1141. 

  1142.     if(st->codec->codec_type==CODEC_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1) {

  1143.         st->codec->sample_rate= sc->time_scale;

  1144.     }

  1145. 

  1146.     return 0;

  1147. }

  1148. 

  1149. static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1150. {

  1151.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1152.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1153.     unsigned int i, entries;

  1154. 

  1155.     get_byte(pb); /* version */

  1156.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1157. 

  1158.     entries = get_be32(pb);

  1159. 

  1160.     if(entries >= UINT_MAX / sizeof(MOV_sample_to_chunk_tbl))

  1161.         return -1;

  1162. 

  1163. #ifdef DEBUG

  1164. av_log(NULL, AV_LOG_DEBUG, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1165. #endif

  1166.     sc->sample_to_chunk_sz = entries;

  1167.     sc->sample_to_chunk = (MOV_sample_to_chunk_tbl*) av_malloc(entries * sizeof(MOV_sample_to_chunk_tbl));

  1168.     if (!sc->sample_to_chunk)

  1169.         return -1;

  1170.     for(i=0; i<entries; i++) {

  1171.         sc->sample_to_chunk[i].first = get_be32(pb);

  1172.         sc->sample_to_chunk[i].count = get_be32(pb);

  1173.         sc->sample_to_chunk[i].id = get_be32(pb);

  1174.     }

  1175.     return 0;

  1176. }

  1177. 

  1178. static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1179. {

  1180.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1181.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1182.     unsigned int i, entries;

  1183. 

  1184.     get_byte(pb); /* version */

  1185.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1186. 

  1187.     entries = get_be32(pb);

  1188. 

  1189.     if(entries >= UINT_MAX / sizeof(long))

  1190.         return -1;

  1191. 

  1192.     sc->keyframe_count = entries;

  1193. #ifdef DEBUG

  1194.     av_log(NULL, AV_LOG_DEBUG, "keyframe_count = %ld\n", sc->keyframe_count);

  1195. #endif

  1196.     sc->keyframes = (long*) av_malloc(entries * sizeof(long));

  1197.     if (!sc->keyframes)

  1198.         return -1;

  1199.     for(i=0; i<entries; i++) {

  1200.         sc->keyframes[i] = get_be32(pb);

  1201. #ifdef DEBUG

  1202. /*        av_log(NULL, AV_LOG_DEBUG, "keyframes[]=%ld\n", sc->keyframes[i]); */

  1203. #endif

  1204.     }

  1205.     return 0;

  1206. }

  1207. 

  1208. static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1209. {

  1210.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1211.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1212.     unsigned int i, entries;

  1213. 

  1214.     get_byte(pb); /* version */

  1215.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1216. 

  1217.     sc->sample_size = get_be32(pb);

  1218.     entries = get_be32(pb);

  1219.     if(entries >= UINT_MAX / sizeof(long))

  1220.         return -1;

  1221. 

  1222.     sc->sample_count = entries;

  1223. #ifdef DEBUG

  1224.     av_log(NULL, AV_LOG_DEBUG, "sample_size = %ld sample_count = %ld\n", sc->sample_size, sc->sample_count);

  1225. #endif

  1226.     if(sc->sample_size)

  1227.         return 0; /* there isn't any table following */

  1228.     sc->sample_sizes = (long*) av_malloc(entries * sizeof(long));

  1229.     if (!sc->sample_sizes)

  1230.         return -1;

  1231.     for(i=0; i<entries; i++) {

  1232.         sc->sample_sizes[i] = get_be32(pb);

  1233. #ifdef DEBUG

  1234.         av_log(NULL, AV_LOG_DEBUG, "sample_sizes[]=%ld\n", sc->sample_sizes[i]);

  1235. #endif

  1236.     }

  1237.     return 0;

  1238. }

  1239. 

  1240. static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1241. {

  1242.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1243.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1244.     unsigned int i, entries;

  1245.     int64_t duration=0;

  1246.     int64_t total_sample_count=0;

  1247. 

  1248.     get_byte(pb); /* version */

  1249.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1250.     entries = get_be32(pb);

  1251.     if(entries >= UINT_MAX / sizeof(Time2Sample))

  1252.         return -1;

  1253. 

  1254.     sc->stts_count = entries;

  1255.     sc->stts_data = av_malloc(entries * sizeof(Time2Sample));

  1256. 

  1257. #ifdef DEBUG

  1258. av_log(NULL, AV_LOG_DEBUG, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);

  1259. #endif

  1260. 

  1261.     sc->time_rate=0;

  1262. 

  1263.     for(i=0; i<entries; i++) {

  1264.         int sample_duration;

  1265.         int sample_count;

  1266. 

  1267.         sample_count=get_be32(pb);

  1268.         sample_duration = get_be32(pb);

  1269.         sc->stts_data[i].count= sample_count;

  1270.         sc->stts_data[i].duration= sample_duration;

  1271. 

  1272.         sc->time_rate= ff_gcd(sc->time_rate, sample_duration);

  1273. 

  1274.         dprintf("sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);

  1275. 

  1276.         duration+=sample_duration*sample_count;

  1277.         total_sample_count+=sample_count;

  1278.     }

  1279. 

  1280.     st->nb_frames= total_sample_count;

  1281.     if(duration)

  1282.         st->duration= duration;

  1283.     return 0;

  1284. }

  1285. 

  1286. static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1287. {

  1288.     unsigned int i, entries;

  1289. 

  1290.     get_byte(pb); /* version */

  1291.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1292.     entries = get_be32(pb);

  1293.     if(entries >= UINT_MAX / sizeof(Time2Sample))

  1294.         return -1;

  1295. 

  1296.     c->streams[c->fc->nb_streams-1]->ctts_count = entries;

  1297.     c->streams[c->fc->nb_streams-1]->ctts_data = av_malloc(entries * sizeof(Time2Sample));

  1298. 

  1299.     dprintf("track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1300. 

  1301.     for(i=0; i<entries; i++) {

  1302.         c->streams[c->fc->nb_streams - 1]->ctts_data[i].count= get_be32(pb);

  1303.         c->streams[c->fc->nb_streams - 1]->ctts_data[i].duration= get_be32(pb);

  1304.     }

  1305.     return 0;

  1306. }

  1307. 

  1308. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1309. {

  1310.     AVStream *st;

  1311.     MOVStreamContext *sc;

  1312. 

  1313.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1314.     if (!st) return -2;

  1315.     sc = (MOVStreamContext*) av_mallocz(sizeof(MOVStreamContext));

  1316.     if (!sc) {

  1317.         av_free(st);

  1318.         return -1;

  1319.     }

  1320. 

  1321.     sc->sample_to_chunk_index = -1;

  1322.     st->priv_data = sc;

  1323.     st->codec->codec_type = CODEC_TYPE_MOV_OTHER;

  1324.     st->start_time = 0; /* XXX: check */

  1325.     c->streams[c->fc->nb_streams-1] = sc;

  1326. 

  1327.     return mov_read_default(c, pb, atom);

  1328. }

  1329. 

  1330. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1331. {

  1332.     AVStream *st;

  1333. 

  1334.     st = c->fc->streams[c->fc->nb_streams-1];

  1335. 

  1336.     get_byte(pb); /* version */

  1337. 

  1338.     get_byte(pb); get_byte(pb);

  1339.     get_byte(pb); /* flags */

  1340.     /*

  1341.     MOV_TRACK_ENABLED 0x0001

  1342.     MOV_TRACK_IN_MOVIE 0x0002

  1343.     MOV_TRACK_IN_PREVIEW 0x0004

  1344.     MOV_TRACK_IN_POSTER 0x0008

  1345.     */

  1346. 

  1347.     get_be32(pb); /* creation time */

  1348.     get_be32(pb); /* modification time */

  1349.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1350.     get_be32(pb); /* reserved */

  1351.     st->start_time = 0; /* check */

  1352.     get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

  1353.     get_be32(pb); /* reserved */

  1354.     get_be32(pb); /* reserved */

  1355. 

  1356.     get_be16(pb); /* layer */

  1357.     get_be16(pb); /* alternate group */

  1358.     get_be16(pb); /* volume */

  1359.     get_be16(pb); /* reserved */

  1360. 

  1361.     url_fskip(pb, 36); /* display matrix */

  1362. 

  1363.     /* those are fixed-point */

  1364.     /*st->codec->width =*/ get_be32(pb) >> 16; /* track width */

  1365.     /*st->codec->height =*/ get_be32(pb) >> 16; /* track height */

  1366. 

  1367.     return 0;

  1368. }

  1369. 

  1370. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1371. /* like the files created with Adobe Premiere 5.0, for samples see */

  1372. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1373. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1374. {

  1375.     int err;

  1376. 

  1377.     if (atom.size < 8)

  1378.         return 0; /* continue */

  1379.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1380.         url_fskip(pb, atom.size - 4);

  1381.         return 0;

  1382.     }

  1383.     atom.type = get_le32(pb);

  1384.     atom.offset += 8;

  1385.     atom.size -= 8;

  1386.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1387.         url_fskip(pb, atom.size);

  1388.         return 0;

  1389.     }

  1390.     err = mov_read_mdat(c, pb, atom);

  1391.     return err;

  1392. }

  1393. 

  1394. 

  1395. #ifdef CONFIG_ZLIB

  1396. static int null_read_packet(void *opaque, uint8_t *buf, int buf_size)

  1397. {

  1398.     return -1;

  1399. }

  1400. 

  1401. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1402. {

  1403.     ByteIOContext ctx;

  1404.     uint8_t *cmov_data;

  1405.     uint8_t *moov_data; /* uncompressed data */

  1406.     long cmov_len, moov_len;

  1407.     int ret;

  1408. 

  1409.     get_be32(pb); /* dcom atom */

  1410.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1411.         return -1;

  1412.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1413.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1414.         return -1;

  1415.     }

  1416.     get_be32(pb); /* cmvd atom */

  1417.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1418.         return -1;

  1419.     moov_len = get_be32(pb); /* uncompressed size */

  1420.     cmov_len = atom.size - 6 * 4;

  1421. 

  1422.     cmov_data = (uint8_t *) av_malloc(cmov_len);

  1423.     if (!cmov_data)

  1424.         return -1;

  1425.     moov_data = (uint8_t *) av_malloc(moov_len);

  1426.     if (!moov_data) {

  1427.         av_free(cmov_data);

  1428.         return -1;

  1429.     }

  1430.     get_buffer(pb, cmov_data, cmov_len);

  1431.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1432.         return -1;

  1433.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, null_read_packet, NULL, NULL) != 0)

  1434.         return -1;

  1435.     ctx.buf_end = ctx.buffer + moov_len;

  1436.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1437.     atom.offset = 0;

  1438.     atom.size = moov_len;

  1439. #ifdef DEBUG

  1440. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1441. #endif

  1442.     ret = mov_read_default(c, &ctx, atom);

  1443.     av_free(moov_data);

  1444.     av_free(cmov_data);

  1445. 

  1446.     return ret;

  1447. }

  1448. #endif

  1449. 

  1450. /* edit list atom */

  1451. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1452. {

  1453.   int i, edit_count;

  1454. 

  1455.   get_byte(pb); /* version */

  1456.   get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1457.   edit_count= c->streams[c->fc->nb_streams-1]->edit_count = get_be32(pb);     /* entries */

  1458. 

  1459.   for(i=0; i<edit_count; i++){

  1460.     get_be32(pb); /* Track duration */

  1461.     get_be32(pb); /* Media time */

  1462.     get_be32(pb); /* Media rate */

  1463.   }

  1464.   dprintf("track[%i].edit_count = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->edit_count);

  1465.   return 0;

  1466. }

  1467. 

  1468. static const MOVParseTableEntry mov_default_parse_table[] = {

  1469. /* mp4 atoms */

  1470. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1471. { MKTAG( 'c', 'p', 'r', 't' ), mov_read_default },

  1472. { MKTAG( 'c', 'r', 'h', 'd' ), mov_read_default },

  1473. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1474. { MKTAG( 'd', 'i', 'n', 'f' ), mov_read_default }, /* data information */

  1475. { MKTAG( 'd', 'p', 'n', 'd' ), mov_read_leaf },

  1476. { MKTAG( 'd', 'r', 'e', 'f' ), mov_read_leaf },

  1477. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1478. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1479. { MKTAG( 'f', 'r', 'e', 'e' ), mov_read_leaf },

  1480. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1481. { MKTAG( 'h', 'i', 'n', 't' ), mov_read_leaf },

  1482. { MKTAG( 'h', 'm', 'h', 'd' ), mov_read_leaf },

  1483. { MKTAG( 'i', 'o', 'd', 's' ), mov_read_leaf },

  1484. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1485. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1486. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1487. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1488. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1489. { MKTAG( 'm', 'p', '4', 'a' ), mov_read_default },

  1490. { MKTAG( 'm', 'p', '4', 's' ), mov_read_default },

  1491. { MKTAG( 'm', 'p', '4', 'v' ), mov_read_default },

  1492. { MKTAG( 'm', 'p', 'o', 'd' ), mov_read_leaf },

  1493. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1494. { MKTAG( 'n', 'm', 'h', 'd' ), mov_read_leaf },

  1495. { MKTAG( 'o', 'd', 'h', 'd' ), mov_read_default },

  1496. { MKTAG( 's', 'd', 'h', 'd' ), mov_read_default },

  1497. { MKTAG( 's', 'k', 'i', 'p' ), mov_read_leaf },

  1498. { MKTAG( 's', 'm', 'h', 'd' ), mov_read_leaf }, /* sound media info header */

  1499. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1500. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_avcC },

  1501. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1502. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1503. { MKTAG( 's', 't', 'd', 'p' ), mov_read_default },

  1504. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1505. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1506. { MKTAG( 's', 't', 's', 'h' ), mov_read_default },

  1507. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1508. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1509. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1510. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1511. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1512. { MKTAG( 't', 'r', 'e', 'f' ), mov_read_default }, /* not really */

  1513. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_leaf },

  1514. { MKTAG( 'u', 'r', 'l', ' ' ), mov_read_leaf },

  1515. { MKTAG( 'u', 'r', 'n', ' ' ), mov_read_leaf },

  1516. { MKTAG( 'u', 'u', 'i', 'd' ), mov_read_leaf },

  1517. { MKTAG( 'v', 'm', 'h', 'd' ), mov_read_leaf }, /* video media info header */

  1518. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1519. /* extra mp4 */

  1520. { MKTAG( 'M', 'D', 'E', 'S' ), mov_read_leaf },

  1521. /* QT atoms */

  1522. { MKTAG( 'c', 'h', 'a', 'p' ), mov_read_leaf },

  1523. { MKTAG( 'c', 'l', 'i', 'p' ), mov_read_default },

  1524. { MKTAG( 'c', 'r', 'g', 'n' ), mov_read_leaf },

  1525. { MKTAG( 'c', 't', 'a', 'b' ), mov_read_ctab },

  1526. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1527. { MKTAG( 'k', 'm', 'a', 't' ), mov_read_leaf },

  1528. { MKTAG( 'm', 'a', 't', 't' ), mov_read_default },

  1529. { MKTAG( 'r', 'd', 'r', 'f' ), mov_read_leaf },

  1530. { MKTAG( 'r', 'm', 'd', 'a' ), mov_read_default },

  1531. { MKTAG( 'r', 'm', 'd', 'r' ), mov_read_leaf },

  1532. { MKTAG( 'r', 'm', 'r', 'a' ), mov_read_default },

  1533. { MKTAG( 's', 'c', 'p', 't' ), mov_read_leaf },

  1534. { MKTAG( 's', 's', 'r', 'c' ), mov_read_leaf },

  1535. { MKTAG( 's', 'y', 'n', 'c' ), mov_read_leaf },

  1536. { MKTAG( 't', 'c', 'm', 'd' ), mov_read_leaf },

  1537. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1538. //{ MKTAG( 'r', 'm', 'q', 'u' ), mov_read_leaf },

  1539. #ifdef CONFIG_ZLIB

  1540. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1541. #else

  1542. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_leaf },

  1543. #endif

  1544. { 0L, mov_read_leaf }

  1545. };

  1546. 

  1547. static void mov_free_stream_context(MOVStreamContext *sc)

  1548. {

  1549.     if(sc) {

  1550.         av_freep(&sc->chunk_offsets);

  1551.         av_freep(&sc->sample_to_chunk);

  1552.         av_freep(&sc->sample_sizes);

  1553.         av_freep(&sc->keyframes);

  1554.         av_freep(&sc->stts_data);

  1555.         av_freep(&sc->ctts_data);

  1556.         av_freep(&sc);

  1557.     }

  1558. }

  1559. 

  1560. static inline uint32_t mov_to_tag(uint8_t *buf)

  1561. {

  1562.     return MKTAG(buf[0], buf[1], buf[2], buf[3]);

  1563. }

  1564. 

  1565. static inline uint32_t to_be32(uint8_t *buf)

  1566. {

  1567.     return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];

  1568. }

  1569. 

  1570. /* XXX: is it sufficient ? */

  1571. static int mov_probe(AVProbeData *p)

  1572. {

  1573.     unsigned int offset;

  1574.     uint32_t tag;

  1575.     int score = 0;

  1576. 

  1577.     /* check file header */

  1578.     if (p->buf_size <= 12)

  1579.         return 0;

  1580.     offset = 0;

  1581.     for(;;) {

  1582.         /* ignore invalid offset */

  1583.         if ((offset + 8) > (unsigned int)p->buf_size)

  1584.             return score;

  1585.         tag = mov_to_tag(p->buf + offset + 4);

  1586.         switch(tag) {

  1587.         /* check for obvious tags */

  1588.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1589.         case MKTAG( 'm', 'd', 'a', 't' ):

  1590.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1591.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1592.             return AVPROBE_SCORE_MAX;

  1593.         /* those are more common words, so rate then a bit less */

  1594.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1595.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1596.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1597.         case MKTAG( 'p', 'i', 'c', 't' ):

  1598.             return AVPROBE_SCORE_MAX - 5;

  1599.         case MKTAG( 'f', 't', 'y', 'p' ):

  1600.         case MKTAG( 's', 'k', 'i', 'p' ):

  1601.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1602.             offset = to_be32(p->buf+offset) + offset;

  1603.             /* if we only find those cause probedata is too small at least rate them */

  1604.             score = AVPROBE_SCORE_MAX - 50;

  1605.             break;

  1606.         default:

  1607.             /* unrecognized tag */

  1608.             return score;

  1609.         }

  1610.     }

  1611.     return score;

  1612. }

  1613. 

  1614. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1615. {

  1616.     MOVContext *mov = (MOVContext *) s->priv_data;

  1617.     ByteIOContext *pb = &s->pb;

  1618.     int i, j, nb, err;

  1619.     MOV_atom_t atom = { 0, 0, 0 };

  1620. 

  1621.     mov->fc = s;

  1622.     mov->parse_table = mov_default_parse_table;

  1623. 

  1624.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1625.         atom.size = url_fsize(pb);

  1626.     else

  1627.         atom.size = 0x7FFFFFFFFFFFFFFFLL;

  1628. 

  1629.     /* check MOV header */

  1630.     err = mov_read_default(mov, pb, atom);

  1631.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1632.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1633.                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1634.         return -1;

  1635.     }

  1636.     dprintf("on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1637. 

  1638.     /* some cleanup : make sure we are on the mdat atom */

  1639.     if(!url_is_streamed(pb) && (url_ftell(pb) != mov->mdat_offset))

  1640.         url_fseek(pb, mov->mdat_offset, SEEK_SET);

  1641. 

  1642.     mov->next_chunk_offset = mov->mdat_offset; /* initialise reading */

  1643.     mov->total_streams = nb = s->nb_streams;

  1644. 

  1645. #if 1

  1646.     for(i=0; i<s->nb_streams;) {

  1647.         if(s->streams[i]->codec->codec_type == CODEC_TYPE_MOV_OTHER) {/* not audio, not video, delete */

  1648.             av_free(s->streams[i]);

  1649.             for(j=i+1; j<s->nb_streams; j++)

  1650.                 s->streams[j-1] = s->streams[j];

  1651.             s->nb_streams--;

  1652.         } else

  1653.             i++;

  1654.     }

  1655.     for(i=0; i<s->nb_streams;i++) {

  1656.         MOVStreamContext *sc = (MOVStreamContext *)s->streams[i]->priv_data;

  1657. 

  1658.         if(!sc->time_rate)

  1659.             sc->time_rate=1;

  1660.         av_set_pts_info(s->streams[i], 64, sc->time_rate, sc->time_scale);

  1661. 

  1662.         if(s->streams[i]->duration != AV_NOPTS_VALUE){

  1663.             assert(s->streams[i]->duration % sc->time_rate == 0);

  1664.             s->streams[i]->duration /= sc->time_rate;

  1665.         }

  1666. 

  1667.         sc->ffindex = i;

  1668.         sc->is_ff_stream = 1;

  1669.     }

  1670. #endif

  1671.     return 0;

  1672. }

  1673. 

  1674. /* Yes, this is ugly... I didn't write the specs of QT :p */

  1675. /* XXX:remove useless commented code sometime */

  1676. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1677. {

  1678.     MOVContext *mov = (MOVContext *) s->priv_data;

  1679.     MOVStreamContext *sc;

  1680.     AVStream *st;

  1681.     int64_t offset = INT64_MAX;

  1682.     int64_t best_dts = INT64_MAX;

  1683.     int i, a, b, m;

  1684.     int size;

  1685.     int idx;

  1686.     size = 0x0FFFFFFF;

  1687. 

  1688.     if (mov->partial) {

  1689.         sc = mov->partial;

  1690.         idx = sc->sample_to_chunk_index;

  1691. 

  1692.         if (idx < 0) return 0;

  1693.         dprintf("sc[ffid %d]->sample_size = %ld\n", sc->ffindex, sc->sample_size);

  1694.         //size = sc->sample_sizes[sc->current_sample];

  1695.         // that ain't working...

  1696.         //size = (sc->sample_size)?sc->sample_size:sc->sample_sizes[sc->current_sample];

  1697.         size = (sc->sample_size > 1)?sc->sample_size:sc->sample_sizes[sc->current_sample];

  1698. 

  1699.         sc->current_sample++;

  1700.         sc->left_in_chunk--;

  1701. 

  1702.         if (sc->left_in_chunk <= 0)

  1703.             mov->partial = 0;

  1704.         offset = mov->next_chunk_offset;

  1705.         /* extract the sample */

  1706. 

  1707.         goto readchunk;

  1708.     }

  1709. 

  1710. again:

  1711.     sc = 0;

  1712.     if(offset == INT64_MAX)

  1713.         best_dts= INT64_MAX;

  1714.     for(i=0; i<mov->total_streams; i++) {

  1715.         MOVStreamContext *msc = mov->streams[i];

  1716. 

  1717.         if ((msc->next_chunk < msc->chunk_count) && msc->next_chunk >= 0){

  1718.             if (msc->sample_to_time_index < msc->stts_count && mov->ni) {

  1719.                 int64_t dts;

  1720.                 int index= msc->sample_to_time_index;

  1721.                 int sample= msc->sample_to_time_sample;

  1722.                 int time= msc->sample_to_time_time;

  1723.                 int duration = msc->stts_data[index].duration;

  1724.                 int count = msc->stts_data[index].count;

  1725.                 if (sample + count < msc->current_sample) {

  1726.                     sample += count;

  1727.                     time   += count*duration;

  1728.                     index ++;

  1729.                     duration = msc->stts_data[index].duration;

  1730.                 }

  1731.                 dts = time + (msc->current_sample-1 - sample) * (int64_t)duration;

  1732.                 dts = av_rescale(dts, AV_TIME_BASE, msc->time_scale);

  1733.                 dprintf("stream: %d dts: %Ld best_dts: %Ld offset: %Ld \n", i, dts, best_dts, offset);

  1734.                 if(dts < best_dts){

  1735.                     best_dts= dts;

  1736.                     sc = msc;

  1737.                     offset = msc->chunk_offsets[msc->next_chunk];

  1738.                 }

  1739.             }else{

  1740.                 if ((msc->chunk_offsets[msc->next_chunk] < offset)) {

  1741.                     sc = msc;

  1742.                     offset = msc->chunk_offsets[msc->next_chunk];

  1743.                 }

  1744.             }

  1745.         }

  1746.     }

  1747.     if (!sc || offset==INT64_MAX)

  1748.         return -1;

  1749. 

  1750.     sc->next_chunk++;

  1751. 

  1752.     if(mov->next_chunk_offset < offset) { /* some meta data */

  1753.         url_fskip(&s->pb, (offset - mov->next_chunk_offset));

  1754.         mov->next_chunk_offset = offset;

  1755.     }

  1756. 

  1757.     if(!sc->is_ff_stream || (s->streams[sc->ffindex]->discard >= AVDISCARD_ALL)) {

  1758.         url_fskip(&s->pb, (offset - mov->next_chunk_offset));

  1759.         mov->next_chunk_offset = offset;

  1760.         offset = INT64_MAX;

  1761.         goto again;

  1762.     }

  1763. 

  1764.     /* now get the chunk size... */

  1765. 

  1766.     for(i=0; i<mov->total_streams; i++) {

  1767.         MOVStreamContext *msc = mov->streams[i];

  1768.         if ((msc->next_chunk < msc->chunk_count)

  1769.             && msc->chunk_offsets[msc->next_chunk] - offset < size

  1770.             && msc->chunk_offsets[msc->next_chunk] > offset)

  1771.             size = msc->chunk_offsets[msc->next_chunk] - offset;

  1772.     }

  1773. 

  1774. #ifdef MOV_MINOLTA_FIX

  1775.     //Make sure that size is according to sample_size (Needed by .mov files

  1776.     //created on a Minolta Dimage Xi where audio chunks contains waste data in the end)

  1777.     //Maybe we should really not only check sc->sample_size, but also sc->sample_sizes

  1778.     //but I have no such movies

  1779.     if (sc->sample_size > 0) {

  1780.         int foundsize=0;

  1781.         for(i=0; i<(sc->sample_to_chunk_sz); i++) {

  1782.             if( (sc->sample_to_chunk[i].first)<=(sc->next_chunk) )

  1783.             {

  1784.                 // I can't figure out why for PCM audio sample_size is always 1

  1785.                 // (it should actually be channels*bits_per_second/8) but it is.

  1786.                 AVCodecContext* cod = s->streams[sc->ffindex]->codec;

  1787.                 if (sc->sample_size == 1 && (cod->codec_id == CODEC_ID_PCM_S16BE || cod->codec_id == CODEC_ID_PCM_S16LE))

  1788.                     foundsize=(sc->sample_to_chunk[i].count*cod->channels*cod->bits_per_sample)/8;

  1789.                 else

  1790.                     foundsize=sc->sample_to_chunk[i].count*sc->sample_size;

  1791.             }

  1792.             dprintf("sample_to_chunk first=%ld count=%ld, id=%ld\n", sc->sample_to_chunk[i].first, sc->sample_to_chunk[i].count, sc->sample_to_chunk[i].id);

  1793.         }

  1794.         if( (foundsize>0) && (foundsize<size) )

  1795.         {

  1796.             size=foundsize;

  1797.         }

  1798.     }

  1799. #endif //MOV_MINOLTA_FIX

  1800. 

  1801.     idx = sc->sample_to_chunk_index;

  1802.     if (idx + 1 < sc->sample_to_chunk_sz && sc->next_chunk >= sc->sample_to_chunk[idx + 1].first)

  1803.         idx++;

  1804.     sc->sample_to_chunk_index = idx;

  1805.     /* split chunks into samples */

  1806.     if (sc->sample_size == 0 || sc->sample_size > 100) {

  1807.         if (idx >= 0 && sc->sample_to_chunk[idx].count != 1) {

  1808.             mov->partial = sc;

  1809.             /* we'll have to get those samples before next chunk */

  1810.             sc->left_in_chunk = sc->sample_to_chunk[idx].count - 1;

  1811.             size = (sc->sample_size > 1)?sc->sample_size:sc->sample_sizes[sc->current_sample];

  1812.         }

  1813. 

  1814.         sc->current_sample++;

  1815.     }else if(idx + 1 < sc->sample_to_chunk_sz){

  1816.         sc->current_sample += sc->sample_size * sc->sample_to_chunk[idx].count;

  1817.     }

  1818. 

  1819. readchunk:

  1820.     dprintf("chunk: %lli -> %lli (%i)\n", offset, offset + size, size);

  1821.     if(size == 0x0FFFFFFF)

  1822.         size = mov->mdat_size + mov->mdat_offset - offset;

  1823.     if(size < 0)

  1824.         return -1;

  1825.     if(size == 0)

  1826.         return -1;

  1827.     url_fseek(&s->pb, offset, SEEK_SET);

  1828. 

  1829.     av_get_packet(&s->pb, pkt, size);

  1830.     pkt->stream_index = sc->ffindex;

  1831. 

  1832.     // If the keyframes table exists, mark any samples that are in the table as key frames.

  1833.     // If no table exists, treat very sample as a key frame.

  1834.     if (sc->keyframes) {

  1835.         a = 0;

  1836.         b = sc->keyframe_count - 1;

  1837. 

  1838.         while (a < b) {

  1839.             m = (a + b + 1) >> 1;

  1840.             if (sc->keyframes[m] > sc->current_sample) {

  1841.                 b = m - 1;

  1842.             } else {

  1843.                 a = m;

  1844.             }

  1845.         }

  1846. 

  1847.         if (sc->keyframes[a] == sc->current_sample)

  1848.             pkt->flags |= PKT_FLAG_KEY;

  1849.     }

  1850.     else

  1851.         pkt->flags |= PKT_FLAG_KEY;

  1852. 

  1853.     mov->next_chunk_offset = offset + size;

  1854. 

  1855.     /* find the corresponding dts */

  1856.     if (sc && sc->sample_to_time_index < sc->stts_count && pkt) {

  1857.       unsigned int count;

  1858.       uint64_t dts, pts;

  1859.       unsigned int duration = sc->stts_data[sc->sample_to_time_index].duration;

  1860.       count = sc->stts_data[sc->sample_to_time_index].count;

  1861.       if ((sc->sample_to_time_sample + count) < sc->current_sample) {

  1862.         sc->sample_to_time_sample += count;

  1863.         sc->sample_to_time_time   += count*duration;

  1864.         sc->sample_to_time_index ++;

  1865.         duration = sc->stts_data[sc->sample_to_time_index].duration;

  1866.       }

  1867.       dts = sc->sample_to_time_time + (sc->current_sample-1 - sc->sample_to_time_sample) * (int64_t)duration;

  1868.         /* find the corresponding pts */

  1869.         if (sc->sample_to_ctime_index < sc->ctts_count) {

  1870.             int duration = sc->ctts_data[sc->sample_to_ctime_index].duration;

  1871.             int count = sc->ctts_data[sc->sample_to_ctime_index].count;

  1872. 

  1873.             if ((sc->sample_to_ctime_sample + count) < sc->current_sample) {

  1874.                 sc->sample_to_ctime_sample += count;

  1875.                 sc->sample_to_ctime_index ++;

  1876.                 duration = sc->ctts_data[sc->sample_to_ctime_index].duration;

  1877.             }

  1878.             pts = dts + duration;

  1879.         }else

  1880.             pts = dts;

  1881. 

  1882.         st= s->streams[ sc->ffindex ];

  1883.         assert(pts % st->time_base.num == 0);

  1884.         assert(dts % st->time_base.num == 0);

  1885. 

  1886.         pkt->pts = pts / st->time_base.num;

  1887.         pkt->dts = dts / st->time_base.num;

  1888.         dprintf("stream #%d smp #%ld dts = %lld pts = %lld (smp:%ld time:%lld idx:%d ent:%d count:%d dur:%d)\n"

  1889.                 , pkt->stream_index, sc->current_sample-1, pkt->dts, pkt->pts

  1890.                 , sc->sample_to_time_sample

  1891.                 , sc->sample_to_time_time

  1892.                 , sc->sample_to_time_index

  1893.                 , sc->stts_count

  1894.                 , count

  1895.                 , duration);

  1896.     }

  1897. 

  1898.     return 0;

  1899. }

  1900. 

  1901. #if defined(MOV_SEEK)

  1902. /**

  1903.  * Seek method based on the one described in the Appendix C of QTFileFormat.pdf

  1904.  */

  1905. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1906. {

  1907.     MOVContext* mov = (MOVContext *) s->priv_data;

  1908.     MOVStreamContext* sc;

  1909.     int32_t i, a, b, m;

  1910.     int64_t start_time;

  1911.     int32_t seek_sample, sample;

  1912.     int32_t duration;

  1913.     int32_t count;

  1914.     int32_t chunk;

  1915.     int32_t left_in_chunk;

  1916.     int64_t chunk_file_offset;

  1917.     int64_t sample_file_offset;

  1918.     int32_t first_chunk_sample;

  1919.     int32_t sample_to_chunk_idx;

  1920.     int sample_to_time_index;

  1921.     long sample_to_time_sample = 0;

  1922.     uint64_t sample_to_time_time = 0;

  1923.     int mov_idx;

  1924. 

  1925.     // Find the corresponding mov stream

  1926.     for (mov_idx = 0; mov_idx < mov->total_streams; mov_idx++)

  1927.         if (mov->streams[mov_idx]->ffindex == stream_index)

  1928.             break;

  1929.     if (mov_idx == mov->total_streams) {

  1930.         av_log(s, AV_LOG_ERROR, "mov: requested stream was not found in mov streams (idx=%i)\n", stream_index);

  1931.         return -1;

  1932.     }

  1933.     sc = mov->streams[mov_idx];

  1934. 

  1935.     sample_time *= s->streams[stream_index]->time_base.num;

  1936. 

  1937.     // Step 1. Find the edit that contains the requested time (elst)

  1938.     if (sc->edit_count && 0) {

  1939.         // FIXME should handle edit list

  1940.         av_log(s, AV_LOG_ERROR, "mov: does not handle seeking in files that contain edit list (c:%d)\n", sc->edit_count);

  1941.         return -1;

  1942.     }

  1943. 

  1944.     // Step 2. Find the corresponding sample using the Time-to-sample atom (stts) */

  1945.     dprintf("Searching for time %li in stream #%i (time_scale=%i)\n", (long)sample_time, mov_idx, sc->time_scale);

  1946.     start_time = 0; // FIXME use elst atom

  1947.     sample = 1; // sample are 0 based in table

  1948. 

  1949.     for (i = 0; i < sc->stts_count; i++) {

  1950.         count = sc->stts_data[i].count;

  1951.         duration = sc->stts_data[i].duration;

  1952.         if ((start_time + count*duration) > sample_time) {

  1953.             sample_to_time_time = start_time;

  1954.             sample_to_time_index = i;

  1955.             sample_to_time_sample = sample;

  1956.             sample += (sample_time - start_time) / duration;

  1957.             break;

  1958.         }

  1959.         sample += count;

  1960.         start_time += count * duration;

  1961.     }

  1962.     sample_to_time_time = start_time;

  1963.     sample_to_time_index = i;

  1964.     /* NOTE: despite what qt doc say, the dt value (Display Time in qt vocabulary) computed with the stts atom

  1965.        is a decoding time stamp (dts) not a presentation time stamp. And as usual dts != pts for stream with b frames */

  1966. 

  1967.     dprintf("Found time %li at sample #%u\n", (long)sample_time, sample);

  1968.     if (sample > sc->sample_count) {

  1969.         av_log(s, AV_LOG_ERROR, "mov: sample pos is too high, unable to seek (req. sample=%i, sample count=%ld)\n", sample, sc->sample_count);

  1970.         return -1;

  1971.     }

  1972. 

  1973.     // Step 3. Find the prior sync. sample using the Sync sample atom (stss)

  1974.     if (sc->keyframes) {

  1975.         a = 0;

  1976.         b = sc->keyframe_count - 1;

  1977.         while (a < b) {

  1978.             m = (a + b + 1) >> 1;

  1979.             if (sc->keyframes[m] > sample) {

  1980.                 b = m - 1;

  1981.             } else {

  1982.                 a = m;

  1983.             }

  1984.         }

  1985.         // for low latency prob: always use the previous keyframe, just uncomment the next line

  1986.         // if (a) a--;

  1987.         seek_sample = sc->keyframes[a];

  1988.     }

  1989.     else

  1990.         seek_sample = sample; // else all samples are key frames

  1991.     dprintf("Found nearest keyframe at sample #%i \n", seek_sample);

  1992. 

  1993.     // Step 4. Find the chunk of the sample using the Sample-to-chunk-atom (stsc)

  1994.     for (first_chunk_sample = 1, i = 0; i < (sc->sample_to_chunk_sz - 1); i++) {

  1995.         b = (sc->sample_to_chunk[i + 1].first - sc->sample_to_chunk[i].first) * sc->sample_to_chunk[i].count;

  1996.         if (seek_sample >= first_chunk_sample && seek_sample < (first_chunk_sample + b))

  1997.             break;

  1998.         first_chunk_sample += b;

  1999.     }

  2000.     chunk = sc->sample_to_chunk[i].first + (seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count;

  2001.     left_in_chunk = sc->sample_to_chunk[i].count - (seek_sample - first_chunk_sample) % sc->sample_to_chunk[i].count;

  2002.     first_chunk_sample += ((seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count) * sc->sample_to_chunk[i].count;

  2003.     sample_to_chunk_idx = i;

  2004.     dprintf("Sample was found in chunk #%i at sample offset %i (idx %i)\n", chunk, seek_sample - first_chunk_sample, sample_to_chunk_idx);

  2005. 

  2006.     // Step 5. Find the offset of the chunk using the chunk offset atom

  2007.     if (!sc->chunk_offsets) {

  2008.         av_log(s, AV_LOG_ERROR, "mov: no chunk offset atom, unable to seek\n");

  2009.         return -1;

  2010.     }

  2011.     if (chunk > sc->chunk_count) {

  2012.         av_log(s, AV_LOG_ERROR, "mov: chunk offset atom too short, unable to seek (req. chunk=%i, chunk count=%li)\n", chunk, sc->chunk_count);

  2013.         return -1;

  2014.     }

  2015.     chunk_file_offset = sc->chunk_offsets[chunk - 1];

  2016.     dprintf("Chunk file offset is #%llu \n", chunk_file_offset);

  2017. 

  2018.     // Step 6. Find the byte offset within the chunk using the sample size atom

  2019.     sample_file_offset = chunk_file_offset;

  2020.     if (sc->sample_size)

  2021.         sample_file_offset += (seek_sample - first_chunk_sample) * sc->sample_size;

  2022.     else {

  2023.         for (i = 0; i < (seek_sample - first_chunk_sample); i++) {

  2024.         sample_file_offset += sc->sample_sizes[first_chunk_sample + i - 1];

  2025.         }

  2026.     }

  2027.     dprintf("Sample file offset is #%llu \n", sample_file_offset);

  2028. 

  2029.     // Step 6. Update the parser

  2030.     mov->partial = sc;

  2031.     mov->next_chunk_offset = sample_file_offset;

  2032.     // Update current stream state

  2033.     sc->current_sample = seek_sample - 1;  // zero based

  2034.     sc->left_in_chunk = left_in_chunk;

  2035.     sc->next_chunk = chunk; // +1 -1 (zero based)

  2036.     sc->sample_to_chunk_index = sample_to_chunk_idx;

  2037. 

  2038.     // Update other streams

  2039.     for (i = 0; i<mov->total_streams; i++) {

  2040.         MOVStreamContext *msc;

  2041.         if (i == mov_idx) continue;

  2042.         // Find the nearest 'next' chunk

  2043.         msc = mov->streams[i];

  2044.         a = 0;

  2045.         b = msc->chunk_count - 1;

  2046.         while (a < b) {

  2047.             m = (a + b + 1) >> 1;

  2048.             if (msc->chunk_offsets[m] > chunk_file_offset) {

  2049.                 b = m - 1;

  2050.             } else {

  2051.                 a = m;

  2052.             }

  2053.         }

  2054.         msc->next_chunk = a;

  2055.         if (msc->chunk_offsets[a] < chunk_file_offset && a < (msc->chunk_count-1))

  2056.             msc->next_chunk ++;

  2057.         dprintf("Nearest next chunk for stream #%i is #%li @%lli\n", i, msc->next_chunk+1, msc->chunk_offsets[msc->next_chunk]);

  2058. 

  2059.         // Compute sample count and index in the sample_to_chunk table (what a pity)

  2060.         msc->sample_to_chunk_index = 0;

  2061.         msc->current_sample = 0;

  2062.         for(;  msc->sample_to_chunk_index < (msc->sample_to_chunk_sz - 1)

  2063.             && msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first <= (1 + msc->next_chunk); msc->sample_to_chunk_index++) {

  2064.             msc->current_sample += (msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first - msc->sample_to_chunk[msc->sample_to_chunk_index].first) \

  2065.             * msc->sample_to_chunk[msc->sample_to_chunk_index].count;

  2066.         }

  2067.         msc->current_sample += (msc->next_chunk - (msc->sample_to_chunk[msc->sample_to_chunk_index].first - 1)) * sc->sample_to_chunk[msc->sample_to_chunk_index].count;

  2068.         msc->left_in_chunk = msc->sample_to_chunk[msc->sample_to_chunk_index].count - 1;

  2069.         // Find corresponding position in stts (used later to compute dts)

  2070.         sample = 0;

  2071.         start_time = 0;

  2072.         for (msc->sample_to_time_index = 0; msc->sample_to_time_index < msc->stts_count; msc->sample_to_time_index++) {

  2073.             count = msc->stts_data[msc->sample_to_time_index].count;

  2074.             duration = msc->stts_data[msc->sample_to_time_index].duration;

  2075.             if ((sample + count - 1) > msc->current_sample) {

  2076.                 msc->sample_to_time_time = start_time;

  2077.                 msc->sample_to_time_sample = sample;

  2078.                 break;

  2079.             }

  2080.             sample += count;

  2081.             start_time += count * duration;

  2082.         }

  2083.         sample = 0;

  2084.         for (msc->sample_to_ctime_index = 0; msc->sample_to_ctime_index < msc->ctts_count; msc->sample_to_ctime_index++) {

  2085.             count = msc->ctts_data[msc->sample_to_ctime_index].count;

  2086.             duration = msc->ctts_data[msc->sample_to_ctime_index].duration;

  2087.             if ((sample + count - 1) > msc->current_sample) {

  2088.                 msc->sample_to_ctime_sample = sample;

  2089.                 break;

  2090.             }

  2091.             sample += count;

  2092.         }

  2093.         dprintf("Next Sample for stream #%i is #%li @%li\n", i, msc->current_sample + 1, msc->sample_to_chunk_index + 1);

  2094.     }

  2095.     return 0;

  2096. }

  2097. #endif

  2098. 

  2099. static int mov_read_close(AVFormatContext *s)

  2100. {

  2101.     int i;

  2102.     MOVContext *mov = (MOVContext *) s->priv_data;

  2103.     for(i=0; i<mov->total_streams; i++)

  2104.         mov_free_stream_context(mov->streams[i]);

  2105.     /* free color tabs */

  2106.     for(i=0; i<mov->ctab_size; i++)

  2107.         av_freep(&mov->ctab[i]);

  2108.     av_freep(&mov->ctab);

  2109.     return 0;

  2110. }

  2111. 

  2112. static AVInputFormat mov_iformat = {

  2113.     "mov,mp4,m4a,3gp,3g2",

  2114.     "QuickTime/MPEG4 format",

  2115.     sizeof(MOVContext),

  2116.     mov_probe,

  2117.     mov_read_header,

  2118.     mov_read_packet,

  2119.     mov_read_close,

  2120. #if defined(MOV_SEEK)

  2121.     mov_read_seek,

  2122. #endif

  2123. };

  2124. 

  2125. int mov_init(void)

  2126. {

  2127.     av_register_input_format(&mov_iformat);

  2128.     return 0;

  2129. }