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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_NONE, 0 },

  148. };

  149. 

  150. static const CodecTag mov_audio_tags[] = {

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

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

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

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

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

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

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

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

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

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

  161. 

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

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

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

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

  166. /* MP4 tags */

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

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

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

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

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

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

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

  174.     { CODEC_ID_NONE, 0 },

  175. };

  176. 

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

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

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

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

  181. static const char *mov_mdhd_language_map[] = {

  182. /* 0-9 */

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

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

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

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

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

  188. /*?*/

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

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

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

  192. /*                   roman? arabic? */

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

  194. /*==rundi?*/

  195.  NULL, "run",  NULL, "mlg", "epo",  NULL,  NULL,  NULL,  NULL,  NULL,

  196. /* 100 */

  197.  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,

  198.  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,

  199.  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL, "wel", "baq",

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

  201. };

  202. 

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

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

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

  206.  */

  207. 

  208. typedef struct MOV_sample_to_chunk_tbl {

  209.     long first;

  210.     long count;

  211.     long id;

  212. } MOV_sample_to_chunk_tbl;

  213. 

  214. typedef struct {

  215.     uint32_t type;

  216.     int64_t offset;

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

  218. } MOV_atom_t;

  219. 

  220. typedef struct {

  221.     int seed;

  222.     int flags;

  223.     int size;

  224.     void* clrs;

  225. } MOV_ctab_t;

  226. 

  227. typedef struct {

  228.     uint8_t  version;

  229.     uint32_t flags; // 24bit

  230. 

  231.     /* 0x03 ESDescrTag */

  232.     uint16_t es_id;

  233. #define MP4ODescrTag                    0x01

  234. #define MP4IODescrTag                   0x02

  235. #define MP4ESDescrTag                   0x03

  236. #define MP4DecConfigDescrTag            0x04

  237. #define MP4DecSpecificDescrTag          0x05

  238. #define MP4SLConfigDescrTag             0x06

  239. #define MP4ContentIdDescrTag            0x07

  240. #define MP4SupplContentIdDescrTag       0x08

  241. #define MP4IPIPtrDescrTag               0x09

  242. #define MP4IPMPPtrDescrTag              0x0A

  243. #define MP4IPMPDescrTag                 0x0B

  244. #define MP4RegistrationDescrTag         0x0D

  245. #define MP4ESIDIncDescrTag              0x0E

  246. #define MP4ESIDRefDescrTag              0x0F

  247. #define MP4FileIODescrTag               0x10

  248. #define MP4FileODescrTag                0x11

  249. #define MP4ExtProfileLevelDescrTag      0x13

  250. #define MP4ExtDescrTagsStart            0x80

  251. #define MP4ExtDescrTagsEnd              0xFE

  252.     uint8_t  stream_priority;

  253. 

  254.     /* 0x04 DecConfigDescrTag */

  255.     uint8_t  object_type_id;

  256.     uint8_t  stream_type;

  257.     /* XXX: really streamType is

  258.      * only 6bit, followed by:

  259.      * 1bit  upStream

  260.      * 1bit  reserved

  261.      */

  262.     uint32_t buffer_size_db; // 24

  263.     uint32_t max_bitrate;

  264.     uint32_t avg_bitrate;

  265. 

  266.     /* 0x05 DecSpecificDescrTag */

  267.     uint8_t  decoder_cfg_len;

  268.     uint8_t *decoder_cfg;

  269. 

  270.     /* 0x06 SLConfigDescrTag */

  271.     uint8_t  sl_config_len;

  272.     uint8_t *sl_config;

  273. } MOV_esds_t;

  274. 

  275. struct MOVParseTableEntry;

  276. 

  277. typedef struct Time2Sample{

  278.     int count;

  279.     int duration;

  280. }Time2Sample;

  281. 

  282. typedef struct MOVStreamContext {

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

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

  285.     long next_chunk;

  286.     long chunk_count;

  287.     int64_t *chunk_offsets;

  288.     int stts_count;

  289.     Time2Sample *stts_data;

  290.     int ctts_count;

  291.     Time2Sample *ctts_data;

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

  293.     long sample_to_chunk_sz;

  294.     MOV_sample_to_chunk_tbl *sample_to_chunk;

  295.     long sample_to_chunk_index;

  296.     int sample_to_time_index;

  297.     long sample_to_time_sample;

  298.     uint64_t sample_to_time_time;

  299.     int sample_to_ctime_index;

  300.     int sample_to_ctime_sample;

  301.     long sample_size;

  302.     long sample_count;

  303.     long *sample_sizes;

  304.     long keyframe_count;

  305.     long *keyframes;

  306.     int time_scale;

  307.     int time_rate;

  308.     long current_sample;

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

  310.     MOV_esds_t esds;

  311. } MOVStreamContext;

  312. 

  313. typedef struct MOVContext {

  314.     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) */

  315.     AVFormatContext *fc;

  316.     int time_scale;

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

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

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

  320.     int64_t mdat_size;

  321.     int64_t mdat_offset;

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

  323.     int total_streams;

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

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

  326.      */

  327.     MOVStreamContext *streams[MAX_STREAMS];

  328. 

  329.     int64_t next_chunk_offset;

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

  331.     int ctab_size;

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

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

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

  335. 

  336.     AVPaletteControl palette_control;

  337. } MOVContext;

  338. 

  339. 

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

  341. 

  342. /* those functions parse an atom */

  343. /* return code:

  344.  1: found what I wanted, exit

  345.  0: continue to parse next atom

  346.  -1: error occured, exit

  347.  */

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

  349. 

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

  351. typedef struct MOVParseTableEntry {

  352.     uint32_t type;

  353.     mov_parse_function func;

  354. } MOVParseTableEntry;

  355. 

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

  357. {

  358.     int i;

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

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

  361.     if (code > 138) {

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

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

  364.             code >>= 5;

  365.         }

  366.         return 1;

  367.     }

  368.     /* old fashion apple lang code */

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

  370.         return 0;

  371.     if (!mov_mdhd_language_map[code])

  372.         return 0;

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

  374.     return 1;

  375. }

  376. 

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

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

  379. {

  380.     int i, code = 0;

  381. 

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

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

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

  385.             return i;

  386.     }

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

  388.     if (!mp4)

  389.         return 0;

  390.     /* handle undefined as such */

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

  392.         lang = "und";

  393.     /* 5bit ascii */

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

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

  396.         if (c < 0x60)

  397.             return 0;

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

  399.             return 0;

  400.         code <<= 5;

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

  402.     }

  403.     return code;

  404. }

  405. 

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

  407. {

  408.     if (atom.size>1)

  409.         url_fskip(pb, atom.size);

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

  411.     return 0;

  412. }

  413. 

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

  415. {

  416.     int64_t total_size = 0;

  417.     MOV_atom_t a;

  418.     int i;

  419.     int err = 0;

  420. 

  421.     a.offset = atom.offset;

  422. 

  423.     if (atom.size < 0)

  424.         atom.size = 0x7fffffffffffffffLL;

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

  426.         a.size = atom.size;

  427.         a.type=0L;

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

  429.             a.size = get_be32(pb);

  430.             a.type = get_le32(pb);

  431.         }

  432.         total_size += 8;

  433.         a.offset += 8;

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

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

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

  437.             a.offset += 8;

  438.             total_size += 8;

  439.         }

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

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

  442.             if (a.size <= 8)

  443.                 break;

  444.         }

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

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

  447.             /* empty */;

  448. 

  449.         a.size -= 8;

  450. 

  451.         if(a.size < 0)

  452.             break;

  453. 

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

  455.             url_fskip(pb, a.size);

  456.         } else {

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

  458.         }

  459. 

  460.         a.offset += a.size;

  461.         total_size += a.size;

  462.     }

  463. 

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

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

  466.     }

  467. 

  468.     return err;

  469. }

  470. 

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

  472. {

  473. #if 1

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

  475. #else

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

  477.     unsigned int len;

  478.     MOV_ctab_t *t;

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

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

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

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

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

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

  485.     if (len > 0) {

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

  487.         if (t->clrs)

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

  489.     }

  490. #endif

  491. 

  492.     return 0;

  493. }

  494. 

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

  496. {

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

  498.     int len = 0;

  499.     uint32_t type;

  500.     uint32_t ctype;

  501. 

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

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

  504. 

  505.     /* component type */

  506.     ctype = get_le32(pb);

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

  508. 

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

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

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

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

  513.         c->mp4 = 0;

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

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

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

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

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

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

  520.         c->mp4 = 1;

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

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

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

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

  525.     }

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

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

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

  529. 

  530.     if(atom.size <= 24)

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

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

  533.     /* component name */

  534. 

  535.     if(c->mp4) {

  536.         /* .mp4: C string */

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

  538.     } else {

  539.         /* .mov: PASCAL string */

  540.         len = get_byte(pb);

  541.         url_fskip(pb, len);

  542.     }

  543. 

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

  545.     return 0;

  546. }

  547. 

  548. static int mov_mp4_read_descr_len(ByteIOContext *pb)

  549. {

  550.     int len = 0;

  551.     int count = 4;

  552.     while (count--) {

  553.         int c = get_byte(pb);

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

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

  556.             break;

  557.     }

  558.     return len;

  559. }

  560. 

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

  562. {

  563.     int len;

  564.     *tag = get_byte(pb);

  565.     len = mov_mp4_read_descr_len(pb);

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

  567.     return len;

  568. }

  569. 

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

  571. {

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

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

  574.     int64_t start_pos = url_ftell(pb);

  575.     int tag, len;

  576. 

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

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

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

  580.     if (tag == MP4ESDescrTag) {

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

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

  583.     } else

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

  585. 

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

  587.     if (tag == MP4DecConfigDescrTag) {

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

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

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

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

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

  593. 

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

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

  596.         if (tag == MP4DecSpecificDescrTag) {

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

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

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

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

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

  602.             }

  603.         }

  604.     }

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

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

  607.     return 0;

  608. }

  609. 

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

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

  612. {

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

  614.         return 0;

  615.     c->found_mdat=1;

  616.     c->mdat_offset = atom.offset;

  617.     c->mdat_size = atom.size;

  618.     if(c->found_moov)

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

  620.     url_fskip(pb, atom.size);

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

  622. }

  623. 

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

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

  626. {

  627.     int err;

  628. 

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

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

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

  632.     c->found_moov=1;

  633.     if(c->found_mdat)

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

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

  636. }

  637. 

  638. 

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

  640. {

  641.     int version;

  642.     int lang;

  643. 

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

  645.     if (version > 1)

  646.         return 1; /* unsupported */

  647. 

  648.     get_byte(pb); get_byte(pb);

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

  650. 

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

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

  653. 

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

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

  656. 

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

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

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

  660. 

  661.     return 0;

  662. }

  663. 

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

  665. {

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

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

  668. 

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

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

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

  672. #ifdef DEBUG

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

  674. #endif

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

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

  677. 

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

  679. 

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

  681. 

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

  683. 

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

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

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

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

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

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

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

  691. 

  692.     return 0;

  693. }

  694. 

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

  696. {

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

  698. 

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

  700.         return -1;

  701. 

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

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

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

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

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

  707. 

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

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

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

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

  712.     } else

  713.         url_fskip(pb, atom.size);

  714. 

  715.     return 0;

  716. }

  717. 

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

  719. {

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

  721. 

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

  723.         return -1;

  724. 

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

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

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

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

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

  730. 

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

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

  733.         } else

  734.             url_fskip(pb, atom.size);

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

  736.         mov_read_default(c, pb, atom);

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

  738.         url_fskip(pb, atom.size);

  739.     return 0;

  740. }

  741. 

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

  743. {

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

  745. 

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

  747.         return -1;

  748. 

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

  750. 

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

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

  753. 

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

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

  756.     } else

  757.         url_fskip(pb, atom.size);

  758. 

  759.     return 0;

  760. }

  761. 

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

  763. {

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

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

  766.     unsigned int i, entries;

  767. 

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

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

  770. 

  771.     entries = get_be32(pb);

  772. 

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

  774.         return -1;

  775. 

  776.     sc->chunk_count = entries;

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

  778.     if (!sc->chunk_offsets)

  779.         return -1;

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

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

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

  783.         }

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

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

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

  787.         }

  788.     } else

  789.         return -1;

  790. 

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

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

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

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

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

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

  797.                 c->ni=1;

  798.         }

  799.     }

  800.     return 0;

  801. }

  802. 

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

  804. {

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

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

  807.     int entries, frames_per_sample;

  808.     uint32_t format;

  809.     uint8_t codec_name[32];

  810. 

  811.     /* for palette traversal */

  812.     int color_depth;

  813.     int color_start;

  814.     int color_count;

  815.     int color_end;

  816.     int color_index;

  817.     int color_dec;

  818.     int color_greyscale;

  819.     unsigned char *color_table;

  820.     int j;

  821.     unsigned char r, g, b;

  822. 

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

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

  825. 

  826.     entries = get_be32(pb);

  827. 

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

  829.         enum CodecID id;

  830.         offset_t start_pos = url_ftell(pb);

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

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

  833. 

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

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

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

  837. 

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

  839.         id = codec_get_id(mov_video_tags, format);

  840.         if(id <= 0)

  841.             id = codec_get_id(codec_bmp_tags, format);

  842.         if (id >= 0) {

  843.             AVCodec *codec;

  844.             codec = avcodec_find_decoder(id);

  845.             if (codec)

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

  847.         }

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

  849.                 size,

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

  851.                 st->codec->codec_type);

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

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

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

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

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

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

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

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

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

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

  862.                 get_be16(pb);

  863.                 get_be16(pb);

  864.             }else{

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

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

  867.             }

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

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

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

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

  872. #ifdef DEBUG

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

  874. #endif

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

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

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

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

  879.         }

  880. 

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

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

  883. 

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

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

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

  887. */

  888. 

  889.             /* figure out the palette situation */

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

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

  892. 

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

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

  895.                 (color_depth == 8)) {

  896. 

  897.                 if (color_greyscale) {

  898. 

  899.                     /* compute the greyscale palette */

  900.                     color_count = 1 << color_depth;

  901.                     color_index = 255;

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

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

  904.                         r = g = b = color_index;

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

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

  907.                         color_index -= color_dec;

  908.                         if (color_index < 0)

  909.                             color_index = 0;

  910.                     }

  911. 

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

  913. 

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

  915.                     color_count = 1 << color_depth;

  916.                     if (color_depth == 2)

  917.                         color_table = ff_qt_default_palette_4;

  918.                     else if (color_depth == 4)

  919.                         color_table = ff_qt_default_palette_16;

  920.                     else

  921.                         color_table = ff_qt_default_palette_256;

  922. 

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

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

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

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

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

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

  929.                     }

  930. 

  931.                 } else {

  932. 

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

  934.                     color_start = get_be32(pb);

  935.                     color_count = get_be16(pb);

  936.                     color_end = get_be16(pb);

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

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

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

  940.                          * up front */

  941.                         get_byte(pb);

  942.                         get_byte(pb);

  943.                         r = get_byte(pb);

  944.                         get_byte(pb);

  945.                         g = get_byte(pb);

  946.                         get_byte(pb);

  947.                         b = get_byte(pb);

  948.                         get_byte(pb);

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

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

  951.                     }

  952.                 }

  953. 

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

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

  956.             } else

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

  958. 

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

  960.             if (a.size > 8)

  961.                 mov_read_default(c, pb, a);

  962.             else if (a.size > 0)

  963.                 url_fskip(pb, a.size);

  964.         } else {

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

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

  967.             {

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

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

  970.                get_be16(pb);//Reserved_2

  971.                get_be16(pb);//Reserved_2

  972.                get_be32(pb);//Reserved_4

  973.                get_be16(pb);//TimeScale

  974.                get_be16(pb);//Reserved_2

  975. 

  976.                 //AMRSpecificBox.(10 bytes)

  977. 

  978.                get_be32(pb); //size

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

  980.                get_be32(pb); //vendor

  981.                get_byte(pb); //decoder version

  982.                get_be16(pb); //mode_set

  983.                get_byte(pb); //mode_change_period

  984.                get_byte(pb); //frames_per_sample

  985. 

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

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

  988.                {

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

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

  991.                }

  992.                else //AMR-WB

  993.                {

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

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

  996.                }

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

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

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

  1000.             }

  1001.             else if( st->codec->codec_tag == MKTAG( 'm', 'p', '4', 's' ))

  1002.             {

  1003.                 //This is some stuff for the hint track, lets ignore it!

  1004.                 //Do some mp4 auto detect.

  1005.                 c->mp4=1;

  1006.                 size-=(16);

  1007.                 url_fskip(pb, size); /* The mp4s atom also contians a esds atom that we can skip*/

  1008.             }

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

  1010.             {

  1011.                 MOV_atom_t a;

  1012.                 int mp4_version;

  1013. 

  1014.                 /* Handle mp4 audio tag */

  1015.                 mp4_version=get_be16(pb);/*version*/

  1016.                 get_be16(pb); /*revesion*/

  1017.                 get_be32(pb);

  1018.                 st->codec->channels = get_be16(pb); /* channels */

  1019.                 st->codec->bits_per_sample = get_be16(pb); /* bits per sample */

  1020.                 get_be32(pb);

  1021.                 st->codec->sample_rate = get_be16(pb); /* sample rate, not always correct */

  1022.                 if(st->codec->sample_rate == 1) //nonsese rate? -> ignore

  1023.                     st->codec->sample_rate= 0;

  1024. 

  1025.                 get_be16(pb);

  1026.                 c->mp4=1;

  1027. 

  1028.                 if(mp4_version==1)

  1029.                 {

  1030.                     url_fskip(pb,16);

  1031.                     a.size=size-(16+20+16);

  1032.                 }

  1033.                 else

  1034.                     a.size=size-(16+20);

  1035. 

  1036.                 a.offset=url_ftell(pb);

  1037. 

  1038.                 mov_read_default(c, pb, a);

  1039. 

  1040.                 /* Get correct sample rate from extradata */

  1041.                 if(st->codec->extradata_size) {

  1042.                    const int samplerate_table[] = {

  1043.                      96000, 88200, 64000, 48000, 44100, 32000,

  1044.                      24000, 22050, 16000, 12000, 11025, 8000,

  1045.                      7350, 0, 0, 0

  1046.                    };

  1047.                    unsigned char *px = st->codec->extradata;

  1048.                    // 5 bits objectTypeIndex, 4 bits sampleRateIndex, 4 bits channels

  1049.                    int samplerate_index = ((px[0] & 7) << 1) + ((px[1] >> 7) & 1);

  1050.                    st->codec->sample_rate = samplerate_table[samplerate_index];

  1051.                    st->codec->channels = (px[1] >> 3) & 15;

  1052.                 }

  1053.             }

  1054.             else if( st->codec->codec_tag == MKTAG( 'a', 'l', 'a', 'c' ))

  1055.             {

  1056.                 /* Handle alac audio tag + special extradata */

  1057.                 get_be32(pb); /* version */

  1058.                 get_be32(pb);

  1059.                 st->codec->channels = get_be16(pb); /* channels */

  1060.                 st->codec->bits_per_sample = get_be16(pb); /* bits per sample */

  1061.                 get_be32(pb);

  1062.                 st->codec->sample_rate = get_be16(pb);

  1063.                 get_be16(pb);

  1064. 

  1065.                 /* fetch the 36-byte extradata needed for alac decoding */

  1066.                 st->codec->extradata_size = 36;

  1067.                 st->codec->extradata = (uint8_t*)

  1068.                     av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1069.                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

  1070.             }

  1071.             else if(size>=(16+20))

  1072.             {//16 bytes read, reading atleast 20 more

  1073.                 uint16_t version;

  1074.                 version = get_be16(pb); /* version */

  1075.                 get_be16(pb); /* revision level */

  1076.                 get_be32(pb); /* vendor */

  1077. 

  1078.                 st->codec->channels = get_be16(pb);             /* channel count */

  1079.                 st->codec->bits_per_sample = get_be16(pb);      /* sample size */

  1080. 

  1081.                 /* handle specific s8 codec */

  1082.                 get_be16(pb); /* compression id = 0*/

  1083.                 get_be16(pb); /* packet size = 0 */

  1084. 

  1085.                 st->codec->sample_rate = ((get_be32(pb) >> 16));

  1086. 

  1087.                 switch (st->codec->codec_id) {

  1088.                 case CODEC_ID_PCM_S16BE:

  1089.                     if (st->codec->bits_per_sample == 8)

  1090.                         st->codec->codec_id = CODEC_ID_PCM_S8;

  1091.                     /* fall */

  1092.                 case CODEC_ID_PCM_U8:

  1093.                     st->codec->bit_rate = st->codec->sample_rate * 8;

  1094.                     break;

  1095.                 default:

  1096.                     ;

  1097.                 }

  1098. 

  1099.                 //Read QT version 1 fields. In version 0 theese dont exist

  1100.                 dprintf("version =%d mp4=%d\n",version,c->mp4);

  1101.                 if((version==1) && size>=(16+20+16))

  1102.                 {

  1103.                     get_be32(pb); /* samples per packet */

  1104.                     get_be32(pb); /* bytes per packet */

  1105.                     get_be32(pb); /* bytes per frame */

  1106.                     get_be32(pb); /* bytes per sample */

  1107.                     if(size>(16+20+16))

  1108.                     {

  1109.                         //Optional, additional atom-based fields

  1110.                         MOV_atom_t a = { format, url_ftell(pb), size - (16 + 20 + 16 + 8) };

  1111.                         mov_read_default(c, pb, a);

  1112.                     }

  1113.                 }

  1114.                 else

  1115.                 {

  1116.                     //We should be down to 0 bytes here, but lets make sure.

  1117.                     size-=(16+20);

  1118.                     if(size>0) {

  1119.                         dprintf("skipping 0x%X bytes\n",size-(16+20));

  1120.                         url_fskip(pb, size);

  1121.                     }

  1122.                 }

  1123.             }

  1124.             else

  1125.             {

  1126.                 size-=16;

  1127.                 //Unknown size, but lets do our best and skip the rest.

  1128.                 dprintf("Strange size, skipping 0x%X bytes\n",size);

  1129.                 url_fskip(pb, size);

  1130.             }

  1131.         }

  1132.     }

  1133. 

  1134.     if(st->codec->codec_type==CODEC_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1) {

  1135.         st->codec->sample_rate= sc->time_scale;

  1136.     }

  1137. 

  1138.     return 0;

  1139. }

  1140. 

  1141. static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1142. {

  1143.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1144.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1145.     unsigned int i, entries;

  1146. 

  1147.     get_byte(pb); /* version */

  1148.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1149. 

  1150.     entries = get_be32(pb);

  1151. 

  1152.     if(entries >= UINT_MAX / sizeof(MOV_sample_to_chunk_tbl))

  1153.         return -1;

  1154. 

  1155. #ifdef DEBUG

  1156. av_log(NULL, AV_LOG_DEBUG, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1157. #endif

  1158.     sc->sample_to_chunk_sz = entries;

  1159.     sc->sample_to_chunk = (MOV_sample_to_chunk_tbl*) av_malloc(entries * sizeof(MOV_sample_to_chunk_tbl));

  1160.     if (!sc->sample_to_chunk)

  1161.         return -1;

  1162.     for(i=0; i<entries; i++) {

  1163.         sc->sample_to_chunk[i].first = get_be32(pb);

  1164.         sc->sample_to_chunk[i].count = get_be32(pb);

  1165.         sc->sample_to_chunk[i].id = get_be32(pb);

  1166.     }

  1167.     return 0;

  1168. }

  1169. 

  1170. static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1171. {

  1172.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1173.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1174.     unsigned int i, entries;

  1175. 

  1176.     get_byte(pb); /* version */

  1177.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1178. 

  1179.     entries = get_be32(pb);

  1180. 

  1181.     if(entries >= UINT_MAX / sizeof(long))

  1182.         return -1;

  1183. 

  1184.     sc->keyframe_count = entries;

  1185. #ifdef DEBUG

  1186.     av_log(NULL, AV_LOG_DEBUG, "keyframe_count = %ld\n", sc->keyframe_count);

  1187. #endif

  1188.     sc->keyframes = (long*) av_malloc(entries * sizeof(long));

  1189.     if (!sc->keyframes)

  1190.         return -1;

  1191.     for(i=0; i<entries; i++) {

  1192.         sc->keyframes[i] = get_be32(pb);

  1193. #ifdef DEBUG

  1194. /*        av_log(NULL, AV_LOG_DEBUG, "keyframes[]=%ld\n", sc->keyframes[i]); */

  1195. #endif

  1196.     }

  1197.     return 0;

  1198. }

  1199. 

  1200. static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1201. {

  1202.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1203.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1204.     unsigned int i, entries;

  1205. 

  1206.     get_byte(pb); /* version */

  1207.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1208. 

  1209.     sc->sample_size = get_be32(pb);

  1210.     entries = get_be32(pb);

  1211.     if(entries >= UINT_MAX / sizeof(long))

  1212.         return -1;

  1213. 

  1214.     sc->sample_count = entries;

  1215. #ifdef DEBUG

  1216.     av_log(NULL, AV_LOG_DEBUG, "sample_size = %ld sample_count = %ld\n", sc->sample_size, sc->sample_count);

  1217. #endif

  1218.     if(sc->sample_size)

  1219.         return 0; /* there isn't any table following */

  1220.     sc->sample_sizes = (long*) av_malloc(entries * sizeof(long));

  1221.     if (!sc->sample_sizes)

  1222.         return -1;

  1223.     for(i=0; i<entries; i++) {

  1224.         sc->sample_sizes[i] = get_be32(pb);

  1225. #ifdef DEBUG

  1226.         av_log(NULL, AV_LOG_DEBUG, "sample_sizes[]=%ld\n", sc->sample_sizes[i]);

  1227. #endif

  1228.     }

  1229.     return 0;

  1230. }

  1231. 

  1232. static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1233. {

  1234.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1235.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1236.     unsigned int i, entries;

  1237.     int64_t duration=0;

  1238.     int64_t total_sample_count=0;

  1239. 

  1240.     get_byte(pb); /* version */

  1241.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1242.     entries = get_be32(pb);

  1243.     if(entries >= UINT_MAX / sizeof(Time2Sample))

  1244.         return -1;

  1245. 

  1246.     sc->stts_count = entries;

  1247.     sc->stts_data = av_malloc(entries * sizeof(Time2Sample));

  1248. 

  1249. #ifdef DEBUG

  1250. av_log(NULL, AV_LOG_DEBUG, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);

  1251. #endif

  1252. 

  1253.     sc->time_rate=0;

  1254. 

  1255.     for(i=0; i<entries; i++) {

  1256.         int sample_duration;

  1257.         int sample_count;

  1258. 

  1259.         sample_count=get_be32(pb);

  1260.         sample_duration = get_be32(pb);

  1261.         sc->stts_data[i].count= sample_count;

  1262.         sc->stts_data[i].duration= sample_duration;

  1263. 

  1264.         sc->time_rate= ff_gcd(sc->time_rate, sample_duration);

  1265. 

  1266.         dprintf("sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);

  1267. 

  1268.         duration+=sample_duration*sample_count;

  1269.         total_sample_count+=sample_count;

  1270.     }

  1271. 

  1272.     st->nb_frames= total_sample_count;

  1273.     if(duration)

  1274.         st->duration= duration;

  1275.     return 0;

  1276. }

  1277. 

  1278. static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1279. {

  1280.     unsigned int i, entries;

  1281. 

  1282.     get_byte(pb); /* version */

  1283.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1284.     entries = get_be32(pb);

  1285.     if(entries >= UINT_MAX / sizeof(Time2Sample))

  1286.         return -1;

  1287. 

  1288.     c->streams[c->fc->nb_streams-1]->ctts_count = entries;

  1289.     c->streams[c->fc->nb_streams-1]->ctts_data = av_malloc(entries * sizeof(Time2Sample));

  1290. 

  1291.     dprintf("track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1292. 

  1293.     for(i=0; i<entries; i++) {

  1294.         c->streams[c->fc->nb_streams - 1]->ctts_data[i].count= get_be32(pb);

  1295.         c->streams[c->fc->nb_streams - 1]->ctts_data[i].duration= get_be32(pb);

  1296.     }

  1297.     return 0;

  1298. }

  1299. 

  1300. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1301. {

  1302.     AVStream *st;

  1303.     MOVStreamContext *sc;

  1304. 

  1305.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1306.     if (!st) return -2;

  1307.     sc = (MOVStreamContext*) av_mallocz(sizeof(MOVStreamContext));

  1308.     if (!sc) {

  1309.         av_free(st);

  1310.         return -1;

  1311.     }

  1312. 

  1313.     sc->sample_to_chunk_index = -1;

  1314.     st->priv_data = sc;

  1315.     st->codec->codec_type = CODEC_TYPE_MOV_OTHER;

  1316.     st->start_time = 0; /* XXX: check */

  1317.     c->streams[c->fc->nb_streams-1] = sc;

  1318. 

  1319.     return mov_read_default(c, pb, atom);

  1320. }

  1321. 

  1322. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1323. {

  1324.     AVStream *st;

  1325. 

  1326.     st = c->fc->streams[c->fc->nb_streams-1];

  1327. 

  1328.     get_byte(pb); /* version */

  1329. 

  1330.     get_byte(pb); get_byte(pb);

  1331.     get_byte(pb); /* flags */

  1332.     /*

  1333.     MOV_TRACK_ENABLED 0x0001

  1334.     MOV_TRACK_IN_MOVIE 0x0002

  1335.     MOV_TRACK_IN_PREVIEW 0x0004

  1336.     MOV_TRACK_IN_POSTER 0x0008

  1337.     */

  1338. 

  1339.     get_be32(pb); /* creation time */

  1340.     get_be32(pb); /* modification time */

  1341.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1342.     get_be32(pb); /* reserved */

  1343.     st->start_time = 0; /* check */

  1344.     get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

  1345.     get_be32(pb); /* reserved */

  1346.     get_be32(pb); /* reserved */

  1347. 

  1348.     get_be16(pb); /* layer */

  1349.     get_be16(pb); /* alternate group */

  1350.     get_be16(pb); /* volume */

  1351.     get_be16(pb); /* reserved */

  1352. 

  1353.     url_fskip(pb, 36); /* display matrix */

  1354. 

  1355.     /* those are fixed-point */

  1356.     /*st->codec->width =*/ get_be32(pb) >> 16; /* track width */

  1357.     /*st->codec->height =*/ get_be32(pb) >> 16; /* track height */

  1358. 

  1359.     return 0;

  1360. }

  1361. 

  1362. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1363. /* like the files created with Adobe Premiere 5.0, for samples see */

  1364. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1365. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1366. {

  1367.     int err;

  1368. 

  1369.     if (atom.size < 8)

  1370.         return 0; /* continue */

  1371.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1372.         url_fskip(pb, atom.size - 4);

  1373.         return 0;

  1374.     }

  1375.     atom.type = get_le32(pb);

  1376.     atom.offset += 8;

  1377.     atom.size -= 8;

  1378.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1379.         url_fskip(pb, atom.size);

  1380.         return 0;

  1381.     }

  1382.     err = mov_read_mdat(c, pb, atom);

  1383.     return err;

  1384. }

  1385. 

  1386. 

  1387. #ifdef CONFIG_ZLIB

  1388. static int null_read_packet(void *opaque, uint8_t *buf, int buf_size)

  1389. {

  1390.     return -1;

  1391. }

  1392. 

  1393. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1394. {

  1395.     ByteIOContext ctx;

  1396.     uint8_t *cmov_data;

  1397.     uint8_t *moov_data; /* uncompressed data */

  1398.     long cmov_len, moov_len;

  1399.     int ret;

  1400. 

  1401.     get_be32(pb); /* dcom atom */

  1402.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1403.         return -1;

  1404.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1405.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1406.         return -1;

  1407.     }

  1408.     get_be32(pb); /* cmvd atom */

  1409.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1410.         return -1;

  1411.     moov_len = get_be32(pb); /* uncompressed size */

  1412.     cmov_len = atom.size - 6 * 4;

  1413. 

  1414.     cmov_data = (uint8_t *) av_malloc(cmov_len);

  1415.     if (!cmov_data)

  1416.         return -1;

  1417.     moov_data = (uint8_t *) av_malloc(moov_len);

  1418.     if (!moov_data) {

  1419.         av_free(cmov_data);

  1420.         return -1;

  1421.     }

  1422.     get_buffer(pb, cmov_data, cmov_len);

  1423.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1424.         return -1;

  1425.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, null_read_packet, NULL, NULL) != 0)

  1426.         return -1;

  1427.     ctx.buf_end = ctx.buffer + moov_len;

  1428.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1429.     atom.offset = 0;

  1430.     atom.size = moov_len;

  1431. #ifdef DEBUG

  1432. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1433. #endif

  1434.     ret = mov_read_default(c, &ctx, atom);

  1435.     av_free(moov_data);

  1436.     av_free(cmov_data);

  1437. 

  1438.     return ret;

  1439. }

  1440. #endif

  1441. 

  1442. /* edit list atom */

  1443. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1444. {

  1445.   int i, edit_count;

  1446. 

  1447.   get_byte(pb); /* version */

  1448.   get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1449.   edit_count= c->streams[c->fc->nb_streams-1]->edit_count = get_be32(pb);     /* entries */

  1450. 

  1451.   for(i=0; i<edit_count; i++){

  1452.     get_be32(pb); /* Track duration */

  1453.     get_be32(pb); /* Media time */

  1454.     get_be32(pb); /* Media rate */

  1455.   }

  1456.   dprintf("track[%i].edit_count = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->edit_count);

  1457.   return 0;

  1458. }

  1459. 

  1460. static const MOVParseTableEntry mov_default_parse_table[] = {

  1461. /* mp4 atoms */

  1462. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1463. { MKTAG( 'c', 'p', 'r', 't' ), mov_read_default },

  1464. { MKTAG( 'c', 'r', 'h', 'd' ), mov_read_default },

  1465. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1466. { MKTAG( 'd', 'i', 'n', 'f' ), mov_read_default }, /* data information */

  1467. { MKTAG( 'd', 'p', 'n', 'd' ), mov_read_leaf },

  1468. { MKTAG( 'd', 'r', 'e', 'f' ), mov_read_leaf },

  1469. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1470. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1471. { MKTAG( 'f', 'r', 'e', 'e' ), mov_read_leaf },

  1472. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1473. { MKTAG( 'h', 'i', 'n', 't' ), mov_read_leaf },

  1474. { MKTAG( 'h', 'm', 'h', 'd' ), mov_read_leaf },

  1475. { MKTAG( 'i', 'o', 'd', 's' ), mov_read_leaf },

  1476. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1477. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1478. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1479. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1480. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1481. { MKTAG( 'm', 'p', '4', 'a' ), mov_read_default },

  1482. { MKTAG( 'm', 'p', '4', 's' ), mov_read_default },

  1483. { MKTAG( 'm', 'p', '4', 'v' ), mov_read_default },

  1484. { MKTAG( 'm', 'p', 'o', 'd' ), mov_read_leaf },

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

  1486. { MKTAG( 'n', 'm', 'h', 'd' ), mov_read_leaf },

  1487. { MKTAG( 'o', 'd', 'h', 'd' ), mov_read_default },

  1488. { MKTAG( 's', 'd', 'h', 'd' ), mov_read_default },

  1489. { MKTAG( 's', 'k', 'i', 'p' ), mov_read_leaf },

  1490. { MKTAG( 's', 'm', 'h', 'd' ), mov_read_leaf }, /* sound media info header */

  1491. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1492. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_avcC },

  1493. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1494. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1495. { MKTAG( 's', 't', 'd', 'p' ), mov_read_default },

  1496. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1497. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1498. { MKTAG( 's', 't', 's', 'h' ), mov_read_default },

  1499. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1500. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1501. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1502. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1503. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1504. { MKTAG( 't', 'r', 'e', 'f' ), mov_read_default }, /* not really */

  1505. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_leaf },

  1506. { MKTAG( 'u', 'r', 'l', ' ' ), mov_read_leaf },

  1507. { MKTAG( 'u', 'r', 'n', ' ' ), mov_read_leaf },

  1508. { MKTAG( 'u', 'u', 'i', 'd' ), mov_read_leaf },

  1509. { MKTAG( 'v', 'm', 'h', 'd' ), mov_read_leaf }, /* video media info header */

  1510. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1511. /* extra mp4 */

  1512. { MKTAG( 'M', 'D', 'E', 'S' ), mov_read_leaf },

  1513. /* QT atoms */

  1514. { MKTAG( 'c', 'h', 'a', 'p' ), mov_read_leaf },

  1515. { MKTAG( 'c', 'l', 'i', 'p' ), mov_read_default },

  1516. { MKTAG( 'c', 'r', 'g', 'n' ), mov_read_leaf },

  1517. { MKTAG( 'c', 't', 'a', 'b' ), mov_read_ctab },

  1518. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1519. { MKTAG( 'k', 'm', 'a', 't' ), mov_read_leaf },

  1520. { MKTAG( 'm', 'a', 't', 't' ), mov_read_default },

  1521. { MKTAG( 'r', 'd', 'r', 'f' ), mov_read_leaf },

  1522. { MKTAG( 'r', 'm', 'd', 'a' ), mov_read_default },

  1523. { MKTAG( 'r', 'm', 'd', 'r' ), mov_read_leaf },

  1524. { MKTAG( 'r', 'm', 'r', 'a' ), mov_read_default },

  1525. { MKTAG( 's', 'c', 'p', 't' ), mov_read_leaf },

  1526. { MKTAG( 's', 's', 'r', 'c' ), mov_read_leaf },

  1527. { MKTAG( 's', 'y', 'n', 'c' ), mov_read_leaf },

  1528. { MKTAG( 't', 'c', 'm', 'd' ), mov_read_leaf },

  1529. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1530. //{ MKTAG( 'r', 'm', 'q', 'u' ), mov_read_leaf },

  1531. #ifdef CONFIG_ZLIB

  1532. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1533. #else

  1534. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_leaf },

  1535. #endif

  1536. { 0L, mov_read_leaf }

  1537. };

  1538. 

  1539. static void mov_free_stream_context(MOVStreamContext *sc)

  1540. {

  1541.     if(sc) {

  1542.         av_freep(&sc->chunk_offsets);

  1543.         av_freep(&sc->sample_to_chunk);

  1544.         av_freep(&sc->sample_sizes);

  1545.         av_freep(&sc->keyframes);

  1546.         av_freep(&sc->stts_data);

  1547.         av_freep(&sc->ctts_data);

  1548.         av_freep(&sc);

  1549.     }

  1550. }

  1551. 

  1552. static inline uint32_t mov_to_tag(uint8_t *buf)

  1553. {

  1554.     return MKTAG(buf[0], buf[1], buf[2], buf[3]);

  1555. }

  1556. 

  1557. static inline uint32_t to_be32(uint8_t *buf)

  1558. {

  1559.     return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];

  1560. }

  1561. 

  1562. /* XXX: is it sufficient ? */

  1563. static int mov_probe(AVProbeData *p)

  1564. {

  1565.     unsigned int offset;

  1566.     uint32_t tag;

  1567.     int score = 0;

  1568. 

  1569.     /* check file header */

  1570.     if (p->buf_size <= 12)

  1571.         return 0;

  1572.     offset = 0;

  1573.     for(;;) {

  1574.         /* ignore invalid offset */

  1575.         if ((offset + 8) > (unsigned int)p->buf_size)

  1576.             return score;

  1577.         tag = mov_to_tag(p->buf + offset + 4);

  1578.         switch(tag) {

  1579.         /* check for obvious tags */

  1580.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1581.         case MKTAG( 'm', 'd', 'a', 't' ):

  1582.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1583.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1584.             return AVPROBE_SCORE_MAX;

  1585.         /* those are more common words, so rate then a bit less */

  1586.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1587.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1588.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1589.         case MKTAG( 'p', 'i', 'c', 't' ):

  1590.             return AVPROBE_SCORE_MAX - 5;

  1591.         case MKTAG( 'f', 't', 'y', 'p' ):

  1592.         case MKTAG( 's', 'k', 'i', 'p' ):

  1593.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1594.             offset = to_be32(p->buf+offset) + offset;

  1595.             /* if we only find those cause probedata is too small at least rate them */

  1596.             score = AVPROBE_SCORE_MAX - 50;

  1597.             break;

  1598.         default:

  1599.             /* unrecognized tag */

  1600.             return score;

  1601.         }

  1602.     }

  1603.     return score;

  1604. }

  1605. 

  1606. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1607. {

  1608.     MOVContext *mov = (MOVContext *) s->priv_data;

  1609.     ByteIOContext *pb = &s->pb;

  1610.     int i, j, nb, err;

  1611.     MOV_atom_t atom = { 0, 0, 0 };

  1612. 

  1613.     mov->fc = s;

  1614.     mov->parse_table = mov_default_parse_table;

  1615. 

  1616.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1617.         atom.size = url_fsize(pb);

  1618.     else

  1619.         atom.size = 0x7FFFFFFFFFFFFFFFLL;

  1620. 

  1621.     /* check MOV header */

  1622.     err = mov_read_default(mov, pb, atom);

  1623.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1624.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1625.                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1626.         return -1;

  1627.     }

  1628.     dprintf("on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1629. 

  1630.     /* some cleanup : make sure we are on the mdat atom */

  1631.     if(!url_is_streamed(pb) && (url_ftell(pb) != mov->mdat_offset))

  1632.         url_fseek(pb, mov->mdat_offset, SEEK_SET);

  1633. 

  1634.     mov->next_chunk_offset = mov->mdat_offset; /* initialise reading */

  1635.     mov->total_streams = nb = s->nb_streams;

  1636. 

  1637. #if 1

  1638.     for(i=0; i<s->nb_streams;) {

  1639.         if(s->streams[i]->codec->codec_type == CODEC_TYPE_MOV_OTHER) {/* not audio, not video, delete */

  1640.             av_free(s->streams[i]);

  1641.             for(j=i+1; j<s->nb_streams; j++)

  1642.                 s->streams[j-1] = s->streams[j];

  1643.             s->nb_streams--;

  1644.         } else

  1645.             i++;

  1646.     }

  1647.     for(i=0; i<s->nb_streams;i++) {

  1648.         MOVStreamContext *sc = (MOVStreamContext *)s->streams[i]->priv_data;

  1649. 

  1650.         if(!sc->time_rate)

  1651.             sc->time_rate=1;

  1652.         av_set_pts_info(s->streams[i], 64, sc->time_rate, sc->time_scale);

  1653. 

  1654.         if(s->streams[i]->duration != AV_NOPTS_VALUE){

  1655.             assert(s->streams[i]->duration % sc->time_rate == 0);

  1656.             s->streams[i]->duration /= sc->time_rate;

  1657.         }

  1658. 

  1659.         sc->ffindex = i;

  1660.         sc->is_ff_stream = 1;

  1661.     }

  1662. #endif

  1663.     return 0;

  1664. }

  1665. 

  1666. /* Yes, this is ugly... I didn't write the specs of QT :p */

  1667. /* XXX:remove useless commented code sometime */

  1668. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1669. {

  1670.     MOVContext *mov = (MOVContext *) s->priv_data;

  1671.     MOVStreamContext *sc;

  1672.     AVStream *st;

  1673.     int64_t offset = INT64_MAX;

  1674.     int64_t best_dts = INT64_MAX;

  1675.     int i, a, b, m;

  1676.     int size;

  1677.     int idx;

  1678.     size = 0x0FFFFFFF;

  1679. 

  1680.     if (mov->partial) {

  1681.         sc = mov->partial;

  1682.         idx = sc->sample_to_chunk_index;

  1683. 

  1684.         if (idx < 0) return 0;

  1685.         dprintf("sc[ffid %d]->sample_size = %ld\n", sc->ffindex, sc->sample_size);

  1686.         //size = sc->sample_sizes[sc->current_sample];

  1687.         // that ain't working...

  1688.         //size = (sc->sample_size)?sc->sample_size:sc->sample_sizes[sc->current_sample];

  1689.         size = (sc->sample_size > 1)?sc->sample_size:sc->sample_sizes[sc->current_sample];

  1690. 

  1691.         sc->current_sample++;

  1692.         sc->left_in_chunk--;

  1693. 

  1694.         if (sc->left_in_chunk <= 0)

  1695.             mov->partial = 0;

  1696.         offset = mov->next_chunk_offset;

  1697.         /* extract the sample */

  1698. 

  1699.         goto readchunk;

  1700.     }

  1701. 

  1702. again:

  1703.     sc = 0;

  1704.     if(offset == INT64_MAX)

  1705.         best_dts= INT64_MAX;

  1706.     for(i=0; i<mov->total_streams; i++) {

  1707.         MOVStreamContext *msc = mov->streams[i];

  1708. 

  1709.         if ((msc->next_chunk < msc->chunk_count) && msc->next_chunk >= 0){

  1710.             if (msc->sample_to_time_index < msc->stts_count && mov->ni) {

  1711.                 int64_t dts;

  1712.                 int index= msc->sample_to_time_index;

  1713.                 int sample= msc->sample_to_time_sample;

  1714.                 int time= msc->sample_to_time_time;

  1715.                 int duration = msc->stts_data[index].duration;

  1716.                 int count = msc->stts_data[index].count;

  1717.                 if (sample + count < msc->current_sample) {

  1718.                     sample += count;

  1719.                     time   += count*duration;

  1720.                     index ++;

  1721.                     duration = msc->stts_data[index].duration;

  1722.                 }

  1723.                 dts = time + (msc->current_sample-1 - sample) * (int64_t)duration;

  1724.                 dts = av_rescale(dts, AV_TIME_BASE, msc->time_scale);

  1725.                 dprintf("stream: %d dts: %Ld best_dts: %Ld offset: %Ld \n", i, dts, best_dts, offset);

  1726.                 if(dts < best_dts){

  1727.                     best_dts= dts;

  1728.                     sc = msc;

  1729.                     offset = msc->chunk_offsets[msc->next_chunk];

  1730.                 }

  1731.             }else{

  1732.                 if ((msc->chunk_offsets[msc->next_chunk] < offset)) {

  1733.                     sc = msc;

  1734.                     offset = msc->chunk_offsets[msc->next_chunk];

  1735.                 }

  1736.             }

  1737.         }

  1738.     }

  1739.     if (!sc || offset==INT64_MAX)

  1740.         return -1;

  1741. 

  1742.     sc->next_chunk++;

  1743. 

  1744.     if(mov->next_chunk_offset < offset) { /* some meta data */

  1745.         url_fskip(&s->pb, (offset - mov->next_chunk_offset));

  1746.         mov->next_chunk_offset = offset;

  1747.     }

  1748. 

  1749.     if(!sc->is_ff_stream || (s->streams[sc->ffindex]->discard >= AVDISCARD_ALL)) {

  1750.         url_fskip(&s->pb, (offset - mov->next_chunk_offset));

  1751.         mov->next_chunk_offset = offset;

  1752.         offset = INT64_MAX;

  1753.         goto again;

  1754.     }

  1755. 

  1756.     /* now get the chunk size... */

  1757. 

  1758.     for(i=0; i<mov->total_streams; i++) {

  1759.         MOVStreamContext *msc = mov->streams[i];

  1760.         if ((msc->next_chunk < msc->chunk_count)

  1761.             && msc->chunk_offsets[msc->next_chunk] - offset < size

  1762.             && msc->chunk_offsets[msc->next_chunk] > offset)

  1763.             size = msc->chunk_offsets[msc->next_chunk] - offset;

  1764.     }

  1765. 

  1766. #ifdef MOV_MINOLTA_FIX

  1767.     //Make sure that size is according to sample_size (Needed by .mov files

  1768.     //created on a Minolta Dimage Xi where audio chunks contains waste data in the end)

  1769.     //Maybe we should really not only check sc->sample_size, but also sc->sample_sizes

  1770.     //but I have no such movies

  1771.     if (sc->sample_size > 0) {

  1772.         int foundsize=0;

  1773.         for(i=0; i<(sc->sample_to_chunk_sz); i++) {

  1774.             if( (sc->sample_to_chunk[i].first)<=(sc->next_chunk) )

  1775.             {

  1776.                 // I can't figure out why for PCM audio sample_size is always 1

  1777.                 // (it should actually be channels*bits_per_second/8) but it is.

  1778.                 AVCodecContext* cod = s->streams[sc->ffindex]->codec;

  1779.                 if (sc->sample_size == 1 && (cod->codec_id == CODEC_ID_PCM_S16BE || cod->codec_id == CODEC_ID_PCM_S16LE))

  1780.                     foundsize=(sc->sample_to_chunk[i].count*cod->channels*cod->bits_per_sample)/8;

  1781.                 else

  1782.                     foundsize=sc->sample_to_chunk[i].count*sc->sample_size;

  1783.             }

  1784.             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);

  1785.         }

  1786.         if( (foundsize>0) && (foundsize<size) )

  1787.         {

  1788.             size=foundsize;

  1789.         }

  1790.     }

  1791. #endif //MOV_MINOLTA_FIX

  1792. 

  1793.     idx = sc->sample_to_chunk_index;

  1794.     if (idx + 1 < sc->sample_to_chunk_sz && sc->next_chunk >= sc->sample_to_chunk[idx + 1].first)

  1795.         idx++;

  1796.     sc->sample_to_chunk_index = idx;

  1797.     /* split chunks into samples */

  1798.     if (sc->sample_size == 0 || sc->sample_size > 100) {

  1799.         if (idx >= 0 && sc->sample_to_chunk[idx].count != 1) {

  1800.             mov->partial = sc;

  1801.             /* we'll have to get those samples before next chunk */

  1802.             sc->left_in_chunk = sc->sample_to_chunk[idx].count - 1;

  1803.             size = (sc->sample_size > 1)?sc->sample_size:sc->sample_sizes[sc->current_sample];

  1804.         }

  1805. 

  1806.         sc->current_sample++;

  1807.     }else if(idx + 1 < sc->sample_to_chunk_sz){

  1808.         sc->current_sample += sc->sample_size * sc->sample_to_chunk[idx].count;

  1809.     }

  1810. 

  1811. readchunk:

  1812.     dprintf("chunk: %lli -> %lli (%i)\n", offset, offset + size, size);

  1813.     if(size == 0x0FFFFFFF)

  1814.         size = mov->mdat_size + mov->mdat_offset - offset;

  1815.     if(size < 0)

  1816.         return -1;

  1817.     if(size == 0)

  1818.         return -1;

  1819.     url_fseek(&s->pb, offset, SEEK_SET);

  1820. 

  1821.     av_get_packet(&s->pb, pkt, size);

  1822.     pkt->stream_index = sc->ffindex;

  1823. 

  1824.     // If the keyframes table exists, mark any samples that are in the table as key frames.

  1825.     // If no table exists, treat very sample as a key frame.

  1826.     if (sc->keyframes) {

  1827.         a = 0;

  1828.         b = sc->keyframe_count - 1;

  1829. 

  1830.         while (a < b) {

  1831.             m = (a + b + 1) >> 1;

  1832.             if (sc->keyframes[m] > sc->current_sample) {

  1833.                 b = m - 1;

  1834.             } else {

  1835.                 a = m;

  1836.             }

  1837.         }

  1838. 

  1839.         if (sc->keyframes[a] == sc->current_sample)

  1840.             pkt->flags |= PKT_FLAG_KEY;

  1841.     }

  1842.     else

  1843.         pkt->flags |= PKT_FLAG_KEY;

  1844. 

  1845.     mov->next_chunk_offset = offset + size;

  1846. 

  1847.     /* find the corresponding dts */

  1848.     if (sc && sc->sample_to_time_index < sc->stts_count && pkt) {

  1849.       unsigned int count;

  1850.       uint64_t dts, pts;

  1851.       unsigned int duration = sc->stts_data[sc->sample_to_time_index].duration;

  1852.       count = sc->stts_data[sc->sample_to_time_index].count;

  1853.       if ((sc->sample_to_time_sample + count) < sc->current_sample) {

  1854.         sc->sample_to_time_sample += count;

  1855.         sc->sample_to_time_time   += count*duration;

  1856.         sc->sample_to_time_index ++;

  1857.         duration = sc->stts_data[sc->sample_to_time_index].duration;

  1858.       }

  1859.       dts = sc->sample_to_time_time + (sc->current_sample-1 - sc->sample_to_time_sample) * (int64_t)duration;

  1860.         /* find the corresponding pts */

  1861.         if (sc->sample_to_ctime_index < sc->ctts_count) {

  1862.             int duration = sc->ctts_data[sc->sample_to_ctime_index].duration;

  1863.             int count = sc->ctts_data[sc->sample_to_ctime_index].count;

  1864. 

  1865.             if ((sc->sample_to_ctime_sample + count) < sc->current_sample) {

  1866.                 sc->sample_to_ctime_sample += count;

  1867.                 sc->sample_to_ctime_index ++;

  1868.                 duration = sc->ctts_data[sc->sample_to_ctime_index].duration;

  1869.             }

  1870.             pts = dts + duration;

  1871.         }else

  1872.             pts = dts;

  1873. 

  1874.         st= s->streams[ sc->ffindex ];

  1875.         assert(pts % st->time_base.num == 0);

  1876.         assert(dts % st->time_base.num == 0);

  1877. 

  1878.         pkt->pts = pts / st->time_base.num;

  1879.         pkt->dts = dts / st->time_base.num;

  1880.         dprintf("stream #%d smp #%ld dts = %lld pts = %lld (smp:%ld time:%lld idx:%d ent:%d count:%d dur:%d)\n"

  1881.                 , pkt->stream_index, sc->current_sample-1, pkt->dts, pkt->pts

  1882.                 , sc->sample_to_time_sample

  1883.                 , sc->sample_to_time_time

  1884.                 , sc->sample_to_time_index

  1885.                 , sc->stts_count

  1886.                 , count

  1887.                 , duration);

  1888.     }

  1889. 

  1890.     return 0;

  1891. }

  1892. 

  1893. #if defined(MOV_SEEK)

  1894. /**

  1895.  * Seek method based on the one described in the Appendix C of QTFileFormat.pdf

  1896.  */

  1897. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1898. {

  1899.     MOVContext* mov = (MOVContext *) s->priv_data;

  1900.     MOVStreamContext* sc;

  1901.     int32_t i, a, b, m;

  1902.     int64_t start_time;

  1903.     int32_t seek_sample, sample;

  1904.     int32_t duration;

  1905.     int32_t count;

  1906.     int32_t chunk;

  1907.     int32_t left_in_chunk;

  1908.     int64_t chunk_file_offset;

  1909.     int64_t sample_file_offset;

  1910.     int32_t first_chunk_sample;

  1911.     int32_t sample_to_chunk_idx;

  1912.     int sample_to_time_index;

  1913.     long sample_to_time_sample = 0;

  1914.     uint64_t sample_to_time_time = 0;

  1915.     int mov_idx;

  1916. 

  1917.     // Find the corresponding mov stream

  1918.     for (mov_idx = 0; mov_idx < mov->total_streams; mov_idx++)

  1919.         if (mov->streams[mov_idx]->ffindex == stream_index)

  1920.             break;

  1921.     if (mov_idx == mov->total_streams) {

  1922.         av_log(s, AV_LOG_ERROR, "mov: requested stream was not found in mov streams (idx=%i)\n", stream_index);

  1923.         return -1;

  1924.     }

  1925.     sc = mov->streams[mov_idx];

  1926. 

  1927.     sample_time *= s->streams[stream_index]->time_base.num;

  1928. 

  1929.     // Step 1. Find the edit that contains the requested time (elst)

  1930.     if (sc->edit_count && 0) {

  1931.         // FIXME should handle edit list

  1932.         av_log(s, AV_LOG_ERROR, "mov: does not handle seeking in files that contain edit list (c:%d)\n", sc->edit_count);

  1933.         return -1;

  1934.     }

  1935. 

  1936.     // Step 2. Find the corresponding sample using the Time-to-sample atom (stts) */

  1937.     dprintf("Searching for time %li in stream #%i (time_scale=%i)\n", (long)sample_time, mov_idx, sc->time_scale);

  1938.     start_time = 0; // FIXME use elst atom

  1939.     sample = 1; // sample are 0 based in table

  1940. 

  1941.     for (i = 0; i < sc->stts_count; i++) {

  1942.         count = sc->stts_data[i].count;

  1943.         duration = sc->stts_data[i].duration;

  1944.         if ((start_time + count*duration) > sample_time) {

  1945.             sample_to_time_time = start_time;

  1946.             sample_to_time_index = i;

  1947.             sample_to_time_sample = sample;

  1948.             sample += (sample_time - start_time) / duration;

  1949.             break;

  1950.         }

  1951.         sample += count;

  1952.         start_time += count * duration;

  1953.     }

  1954.     sample_to_time_time = start_time;

  1955.     sample_to_time_index = i;

  1956.     /* NOTE: despite what qt doc say, the dt value (Display Time in qt vocabulary) computed with the stts atom

  1957.        is a decoding time stamp (dts) not a presentation time stamp. And as usual dts != pts for stream with b frames */

  1958. 

  1959.     dprintf("Found time %li at sample #%u\n", (long)sample_time, sample);

  1960.     if (sample > sc->sample_count) {

  1961.         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);

  1962.         return -1;

  1963.     }

  1964. 

  1965.     // Step 3. Find the prior sync. sample using the Sync sample atom (stss)

  1966.     if (sc->keyframes) {

  1967.         a = 0;

  1968.         b = sc->keyframe_count - 1;

  1969.         while (a < b) {

  1970.             m = (a + b + 1) >> 1;

  1971.             if (sc->keyframes[m] > sample) {

  1972.                 b = m - 1;

  1973.             } else {

  1974.                 a = m;

  1975.             }

  1976.         }

  1977.         // for low latency prob: always use the previous keyframe, just uncomment the next line

  1978.         // if (a) a--;

  1979.         seek_sample = sc->keyframes[a];

  1980.     }

  1981.     else

  1982.         seek_sample = sample; // else all samples are key frames

  1983.     dprintf("Found nearest keyframe at sample #%i \n", seek_sample);

  1984. 

  1985.     // Step 4. Find the chunk of the sample using the Sample-to-chunk-atom (stsc)

  1986.     for (first_chunk_sample = 1, i = 0; i < (sc->sample_to_chunk_sz - 1); i++) {

  1987.         b = (sc->sample_to_chunk[i + 1].first - sc->sample_to_chunk[i].first) * sc->sample_to_chunk[i].count;

  1988.         if (seek_sample >= first_chunk_sample && seek_sample < (first_chunk_sample + b))

  1989.             break;

  1990.         first_chunk_sample += b;

  1991.     }

  1992.     chunk = sc->sample_to_chunk[i].first + (seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count;

  1993.     left_in_chunk = sc->sample_to_chunk[i].count - (seek_sample - first_chunk_sample) % sc->sample_to_chunk[i].count;

  1994.     first_chunk_sample += ((seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count) * sc->sample_to_chunk[i].count;

  1995.     sample_to_chunk_idx = i;

  1996.     dprintf("Sample was found in chunk #%i at sample offset %i (idx %i)\n", chunk, seek_sample - first_chunk_sample, sample_to_chunk_idx);

  1997. 

  1998.     // Step 5. Find the offset of the chunk using the chunk offset atom

  1999.     if (!sc->chunk_offsets) {

  2000.         av_log(s, AV_LOG_ERROR, "mov: no chunk offset atom, unable to seek\n");

  2001.         return -1;

  2002.     }

  2003.     if (chunk > sc->chunk_count) {

  2004.         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);

  2005.         return -1;

  2006.     }

  2007.     chunk_file_offset = sc->chunk_offsets[chunk - 1];

  2008.     dprintf("Chunk file offset is #%llu \n", chunk_file_offset);

  2009. 

  2010.     // Step 6. Find the byte offset within the chunk using the sample size atom

  2011.     sample_file_offset = chunk_file_offset;

  2012.     if (sc->sample_size)

  2013.         sample_file_offset += (seek_sample - first_chunk_sample) * sc->sample_size;

  2014.     else {

  2015.         for (i = 0; i < (seek_sample - first_chunk_sample); i++) {

  2016.         sample_file_offset += sc->sample_sizes[first_chunk_sample + i - 1];

  2017.         }

  2018.     }

  2019.     dprintf("Sample file offset is #%llu \n", sample_file_offset);

  2020. 

  2021.     // Step 6. Update the parser

  2022.     mov->partial = sc;

  2023.     mov->next_chunk_offset = sample_file_offset;

  2024.     // Update current stream state

  2025.     sc->current_sample = seek_sample - 1;  // zero based

  2026.     sc->left_in_chunk = left_in_chunk;

  2027.     sc->next_chunk = chunk; // +1 -1 (zero based)

  2028.     sc->sample_to_chunk_index = sample_to_chunk_idx;

  2029. 

  2030.     // Update other streams

  2031.     for (i = 0; i<mov->total_streams; i++) {

  2032.         MOVStreamContext *msc;

  2033.         if (i == mov_idx) continue;

  2034.         // Find the nearest 'next' chunk

  2035.         msc = mov->streams[i];

  2036.         a = 0;

  2037.         b = msc->chunk_count - 1;

  2038.         while (a < b) {

  2039.             m = (a + b + 1) >> 1;

  2040.             if (msc->chunk_offsets[m] > chunk_file_offset) {

  2041.                 b = m - 1;

  2042.             } else {

  2043.                 a = m;

  2044.             }

  2045.         }

  2046.         msc->next_chunk = a;

  2047.         if (msc->chunk_offsets[a] < chunk_file_offset && a < (msc->chunk_count-1))

  2048.             msc->next_chunk ++;

  2049.         dprintf("Nearest next chunk for stream #%i is #%li @%lli\n", i, msc->next_chunk+1, msc->chunk_offsets[msc->next_chunk]);

  2050. 

  2051.         // Compute sample count and index in the sample_to_chunk table (what a pity)

  2052.         msc->sample_to_chunk_index = 0;

  2053.         msc->current_sample = 0;

  2054.         for(;  msc->sample_to_chunk_index < (msc->sample_to_chunk_sz - 1)

  2055.             && msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first <= (1 + msc->next_chunk); msc->sample_to_chunk_index++) {

  2056.             msc->current_sample += (msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first - msc->sample_to_chunk[msc->sample_to_chunk_index].first) \

  2057.             * msc->sample_to_chunk[msc->sample_to_chunk_index].count;

  2058.         }

  2059.         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;

  2060.         msc->left_in_chunk = msc->sample_to_chunk[msc->sample_to_chunk_index].count - 1;

  2061.         // Find corresponding position in stts (used later to compute dts)

  2062.         sample = 0;

  2063.         start_time = 0;

  2064.         for (msc->sample_to_time_index = 0; msc->sample_to_time_index < msc->stts_count; msc->sample_to_time_index++) {

  2065.             count = msc->stts_data[msc->sample_to_time_index].count;

  2066.             duration = msc->stts_data[msc->sample_to_time_index].duration;

  2067.             if ((sample + count - 1) > msc->current_sample) {

  2068.                 msc->sample_to_time_time = start_time;

  2069.                 msc->sample_to_time_sample = sample;

  2070.                 break;

  2071.             }

  2072.             sample += count;

  2073.             start_time += count * duration;

  2074.         }

  2075.         sample = 0;

  2076.         for (msc->sample_to_ctime_index = 0; msc->sample_to_ctime_index < msc->ctts_count; msc->sample_to_ctime_index++) {

  2077.             count = msc->ctts_data[msc->sample_to_ctime_index].count;

  2078.             duration = msc->ctts_data[msc->sample_to_ctime_index].duration;

  2079.             if ((sample + count - 1) > msc->current_sample) {

  2080.                 msc->sample_to_ctime_sample = sample;

  2081.                 break;

  2082.             }

  2083.             sample += count;

  2084.         }

  2085.         dprintf("Next Sample for stream #%i is #%li @%li\n", i, msc->current_sample + 1, msc->sample_to_chunk_index + 1);

  2086.     }

  2087.     return 0;

  2088. }

  2089. #endif

  2090. 

  2091. static int mov_read_close(AVFormatContext *s)

  2092. {

  2093.     int i;

  2094.     MOVContext *mov = (MOVContext *) s->priv_data;

  2095.     for(i=0; i<mov->total_streams; i++)

  2096.         mov_free_stream_context(mov->streams[i]);

  2097.     /* free color tabs */

  2098.     for(i=0; i<mov->ctab_size; i++)

  2099.         av_freep(&mov->ctab[i]);

  2100.     av_freep(&mov->ctab);

  2101.     return 0;

  2102. }

  2103. 

  2104. static AVInputFormat mov_iformat = {

  2105.     "mov,mp4,m4a,3gp,3g2",

  2106.     "QuickTime/MPEG4 format",

  2107.     sizeof(MOVContext),

  2108.     mov_probe,

  2109.     mov_read_header,

  2110.     mov_read_packet,

  2111.     mov_read_close,

  2112. #if defined(MOV_SEEK)

  2113.     mov_read_seek,

  2114. #endif

  2115. };

  2116. 

  2117. int mov_init(void)

  2118. {

  2119.     av_register_input_format(&mov_iformat);

  2120.     return 0;

  2121. }