falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
12577 Commits
32 Branches
582MB
Tree: 13a75d5a76
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '13a75d5a76'
${ noResults }
FFmpeg/libavformat/mov.c

1649 lines
55KB
Raw Blame History 

  1. /*

  2.  * MOV demuxer

  3.  * Copyright (c) 2001 Fabrice Bellard.

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include <limits.h>

  23. 

  24. //#define DEBUG

  25. 

  26. #include "avformat.h"

  27. #include "riff.h"

  28. #include "isom.h"

  29. #include "dv.h"

  30. 

  31. #ifdef CONFIG_ZLIB

  32. #include <zlib.h>

  33. #endif

  34. 

  35. /*

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

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

  38.  *

  39.  * Features and limitations:

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

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

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

  43.  *

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

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

  46.  *

  47.  * Reference documents:

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

  49.  * Apple:

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

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

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

  53.  */

  54. 

  55. #include "qtpalette.h"

  56. 

  57. 

  58. #undef NDEBUG

  59. #include <assert.h>

  60. 

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

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

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

  64.  */

  65. 

  66. typedef struct {

  67.     int first;

  68.     int count;

  69.     int id;

  70. } MOV_stsc_t;

  71. 

  72. typedef struct {

  73.     uint32_t type;

  74.     int64_t offset;

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

  76. } MOV_atom_t;

  77. 

  78. struct MOVParseTableEntry;

  79. 

  80. typedef struct MOVStreamContext {

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

  82.     int next_chunk;

  83.     unsigned int chunk_count;

  84.     int64_t *chunk_offsets;

  85.     unsigned int stts_count;

  86.     MOV_stts_t *stts_data;

  87.     unsigned int ctts_count;

  88.     MOV_stts_t *ctts_data;

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

  90.     unsigned int sample_to_chunk_sz;

  91.     MOV_stsc_t *sample_to_chunk;

  92.     int sample_to_ctime_index;

  93.     int sample_to_ctime_sample;

  94.     unsigned int sample_size;

  95.     unsigned int sample_count;

  96.     int *sample_sizes;

  97.     unsigned int keyframe_count;

  98.     int *keyframes;

  99.     int time_scale;

  100.     int time_rate;

  101.     int current_sample;

  102.     unsigned int bytes_per_frame;

  103.     unsigned int samples_per_frame;

  104.     int dv_audio_container;

  105.     int pseudo_stream_id;

  106.     int16_t audio_cid; ///< stsd audio compression id

  107. } MOVStreamContext;

  108. 

  109. typedef struct MOVContext {

  110.     AVFormatContext *fc;

  111.     int time_scale;

  112.     int64_t duration; /* duration of the longest track */

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

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

  115.     AVPaletteControl palette_control;

  116.     DVDemuxContext *dv_demux;

  117.     AVFormatContext *dv_fctx;

  118.     int isom; /* 1 if file is ISO Media (mp4/3gp) */

  119. } MOVContext;

  120. 

  121. 

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

  123. 

  124. /* those functions parse an atom */

  125. /* return code:

  126.  1: found what I wanted, exit

  127.  0: continue to parse next atom

  128.  -1: error occured, exit

  129.  */

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

  131. typedef struct MOVParseTableEntry {

  132.     uint32_t type;

  133.     int (*parse)(MOVContext *ctx, ByteIOContext *pb, MOV_atom_t atom);

  134. } MOVParseTableEntry;

  135. 

  136. static const MOVParseTableEntry mov_default_parse_table[];

  137. 

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

  139. {

  140.     int64_t total_size = 0;

  141.     MOV_atom_t a;

  142.     int i;

  143.     int err = 0;

  144. 

  145.     a.offset = atom.offset;

  146. 

  147.     if (atom.size < 0)

  148.         atom.size = INT64_MAX;

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

  150.         a.size = atom.size;

  151.         a.type=0;

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

  153.             a.size = get_be32(pb);

  154.             a.type = get_le32(pb);

  155.         }

  156.         total_size += 8;

  157.         a.offset += 8;

  158.         dprintf(c->fc, "type: %08x  %.4s  sz: %"PRIx64"  %"PRIx64"   %"PRIx64"\n",

  159.                 a.type, (char*)&a.type, a.size, atom.size, total_size);

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

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

  162.             a.offset += 8;

  163.             total_size += 8;

  164.         }

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

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

  167.             if (a.size <= 8)

  168.                 break;

  169.         }

  170.         a.size -= 8;

  171.         if(a.size < 0)

  172.             break;

  173.         a.size = FFMIN(a.size, atom.size - total_size);

  174. 

  175.         for (i = 0; mov_default_parse_table[i].type != 0

  176.              && mov_default_parse_table[i].type != a.type; i++)

  177.             /* empty */;

  178. 

  179.         if (mov_default_parse_table[i].type == 0) { /* skip leaf atoms data */

  180.             url_fskip(pb, a.size);

  181.         } else {

  182.             offset_t start_pos = url_ftell(pb);

  183.             int64_t left;

  184.             err = mov_default_parse_table[i].parse(c, pb, a);

  185.             if (c->found_moov && c->found_mdat)

  186.                 break;

  187.             left = a.size - url_ftell(pb) + start_pos;

  188.             if (left > 0) /* skip garbage at atom end */

  189.                 url_fskip(pb, left);

  190.         }

  191. 

  192.         a.offset += a.size;

  193.         total_size += a.size;

  194.     }

  195. 

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

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

  198.     }

  199. 

  200.     return err;

  201. }

  202. 

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

  204. {

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

  206.     uint32_t type;

  207.     uint32_t ctype;

  208. 

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

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

  211. 

  212.     /* component type */

  213.     ctype = get_le32(pb);

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

  215. 

  216.     dprintf(c->fc, "ctype= %c%c%c%c (0x%08x)\n", *((char *)&ctype), ((char *)&ctype)[1],

  217.             ((char *)&ctype)[2], ((char *)&ctype)[3], (int) ctype);

  218.     dprintf(c->fc, "stype= %c%c%c%c\n",

  219.             *((char *)&type), ((char *)&type)[1], ((char *)&type)[2], ((char *)&type)[3]);

  220.     if(!ctype)

  221.         c->isom = 1;

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

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

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

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

  226.     else if(type == MKTAG('m', '1', 'a', ' '))

  227.         st->codec->codec_id = CODEC_ID_MP2;

  228.     else if(type == MKTAG('s', 'u', 'b', 'p')) {

  229.         st->codec->codec_type = CODEC_TYPE_SUBTITLE;

  230.     }

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

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

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

  234. 

  235.     if(atom.size <= 24)

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

  237. 

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

  239.     return 0;

  240. }

  241. 

  242. static int mp4_read_descr_len(ByteIOContext *pb)

  243. {

  244.     int len = 0;

  245.     int count = 4;

  246.     while (count--) {

  247.         int c = get_byte(pb);

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

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

  250.             break;

  251.     }

  252.     return len;

  253. }

  254. 

  255. static int mp4_read_descr(MOVContext *c, ByteIOContext *pb, int *tag)

  256. {

  257.     int len;

  258.     *tag = get_byte(pb);

  259.     len = mp4_read_descr_len(pb);

  260.     dprintf(c->fc, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len);

  261.     return len;

  262. }

  263. 

  264. #define MP4ESDescrTag                   0x03

  265. #define MP4DecConfigDescrTag            0x04

  266. #define MP4DecSpecificDescrTag          0x05

  267. 

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

  269. {

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

  271.     int tag, len;

  272. 

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

  274.     len = mp4_read_descr(c, pb, &tag);

  275.     if (tag == MP4ESDescrTag) {

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

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

  278.     } else

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

  280. 

  281.     len = mp4_read_descr(c, pb, &tag);

  282.     if (tag == MP4DecConfigDescrTag) {

  283.         int object_type_id = get_byte(pb);

  284.         get_byte(pb); /* stream type */

  285.         get_be24(pb); /* buffer size db */

  286.         get_be32(pb); /* max bitrate */

  287.         get_be32(pb); /* avg bitrate */

  288. 

  289.         st->codec->codec_id= codec_get_id(ff_mp4_obj_type, object_type_id);

  290.         dprintf(c->fc, "esds object type id %d\n", object_type_id);

  291.         len = mp4_read_descr(c, pb, &tag);

  292.         if (tag == MP4DecSpecificDescrTag) {

  293.             dprintf(c->fc, "Specific MPEG4 header len=%d\n", len);

  294.             st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);

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

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

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

  298.                 /* from mplayer */

  299.                 if ((*st->codec->extradata >> 3) == 29) {

  300.                     st->codec->codec_id = CODEC_ID_MP3ON4;

  301.                 }

  302.             }

  303.         }

  304.     }

  305.     return 0;

  306. }

  307. 

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

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

  310. {

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

  312.         return 0;

  313.     c->found_mdat=1;

  314.     if(c->found_moov)

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

  316.     url_fskip(pb, atom.size);

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

  318. }

  319. 

  320. static int mov_read_ftyp(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  321. {

  322.     uint32_t type = get_le32(pb);

  323. 

  324.     if (type != MKTAG('q','t',' ',' '))

  325.         c->isom = 1;

  326.     av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);

  327.     get_be32(pb); /* minor version */

  328.     url_fskip(pb, atom.size - 8);

  329.     return 0;

  330. }

  331. 

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

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

  334. {

  335.     if (mov_read_default(c, pb, atom) < 0)

  336.         return -1;

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

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

  339.     c->found_moov=1;

  340.     if(c->found_mdat)

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

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

  343. }

  344. 

  345. 

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

  347. {

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

  349.     MOVStreamContext *sc = st->priv_data;

  350.     int version = get_byte(pb);

  351.     int lang;

  352. 

  353.     if (version > 1)

  354.         return 1; /* unsupported */

  355. 

  356.     get_byte(pb); get_byte(pb);

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

  358. 

  359.     if (version == 1) {

  360.         get_be64(pb);

  361.         get_be64(pb);

  362.     } else {

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

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

  365.     }

  366. 

  367.     sc->time_scale = get_be32(pb);

  368.     st->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */

  369. 

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

  371.     ff_mov_lang_to_iso639(lang, st->language);

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

  373. 

  374.     return 0;

  375. }

  376. 

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

  378. {

  379.     int version = get_byte(pb); /* version */

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

  381. 

  382.     if (version == 1) {

  383.         get_be64(pb);

  384.         get_be64(pb);

  385.     } else {

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

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

  388.     }

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

  390. 

  391.     dprintf(c->fc, "time scale = %i\n", c->time_scale);

  392. 

  393.     c->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */

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

  395. 

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

  397. 

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

  399. 

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

  401. 

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

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

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

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

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

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

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

  409. 

  410.     return 0;

  411. }

  412. 

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

  414. {

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

  416. 

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

  418.         return -1;

  419. 

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

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

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

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

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

  425. 

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

  427.         memcpy(st->codec->extradata, "SVQ3", 4); // fake

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

  429.         dprintf(c->fc, "Reading SMI %"PRId64"  %s\n", atom.size, st->codec->extradata + 0x5a);

  430.     } else

  431.         url_fskip(pb, atom.size);

  432. 

  433.     return 0;

  434. }

  435. 

  436. static int mov_read_enda(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  437. {

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

  439.     int little_endian = get_be16(pb);

  440. 

  441.     if (little_endian) {

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

  443.         case CODEC_ID_PCM_S24BE:

  444.             st->codec->codec_id = CODEC_ID_PCM_S24LE;

  445.             break;

  446.         case CODEC_ID_PCM_S32BE:

  447.             st->codec->codec_id = CODEC_ID_PCM_S32LE;

  448.             break;

  449.         default:

  450.             break;

  451.         }

  452.     }

  453.     return 0;

  454. }

  455. 

  456. /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */

  457. static int mov_read_extradata(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  458. {

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

  460.     uint64_t size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;

  461.     uint8_t *buf;

  462.     if(size > INT_MAX || (uint64_t)atom.size > INT_MAX)

  463.         return -1;

  464.     buf= av_realloc(st->codec->extradata, size);

  465.     if(!buf)

  466.         return -1;

  467.     st->codec->extradata= buf;

  468.     buf+= st->codec->extradata_size;

  469.     st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;

  470.     AV_WB32(       buf    , atom.size + 8);

  471.     AV_WL32(       buf + 4, atom.type);

  472.     get_buffer(pb, buf + 8, atom.size);

  473.     return 0;

  474. }

  475. 

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

  477. {

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

  479. 

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

  481.         return -1;

  482. 

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

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

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

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

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

  488. 

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

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

  491.         } else

  492.             url_fskip(pb, atom.size);

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

  494.         if (mov_read_default(c, pb, atom) < 0)

  495.             return -1;

  496.     } else

  497.         url_fskip(pb, atom.size);

  498.     return 0;

  499. }

  500. 

  501. /**

  502.  * This function reads atom content and puts data in extradata without tag

  503.  * nor size unlike mov_read_extradata.

  504.  */

  505. static int mov_read_glbl(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  506. {

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

  508. 

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

  510.         return -1;

  511. 

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

  513. 

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

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

  516. 

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

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

  519.     } else

  520.         url_fskip(pb, atom.size);

  521. 

  522.     return 0;

  523. }

  524. 

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

  526. {

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

  528.     MOVStreamContext *sc = st->priv_data;

  529.     unsigned int i, entries;

  530. 

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

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

  533. 

  534.     entries = get_be32(pb);

  535. 

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

  537.         return -1;

  538. 

  539.     sc->chunk_count = entries;

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

  541.     if (!sc->chunk_offsets)

  542.         return -1;

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

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

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

  546.         }

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

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

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

  550.         }

  551.     } else

  552.         return -1;

  553. 

  554.     return 0;

  555. }

  556. 

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

  558. {

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

  560.     MOVStreamContext *sc = st->priv_data;

  561.     int entries, frames_per_sample;

  562.     uint32_t format;

  563.     uint8_t codec_name[32];

  564. 

  565.     /* for palette traversal */

  566.     unsigned int color_depth;

  567.     unsigned int color_start;

  568.     unsigned int color_count;

  569.     unsigned int color_end;

  570.     int color_index;

  571.     int color_dec;

  572.     int color_greyscale;

  573.     const uint8_t *color_table;

  574.     int j, pseudo_stream_id;

  575.     unsigned char r, g, b;

  576. 

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

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

  579. 

  580.     entries = get_be32(pb);

  581. 

  582.     for(pseudo_stream_id=0; pseudo_stream_id<entries; pseudo_stream_id++) { //Parsing Sample description table

  583.         enum CodecID id;

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

  585.         offset_t start_pos = url_ftell(pb);

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

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

  588. 

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

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

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

  592. 

  593.         if (st->codec->codec_tag &&

  594.             (c->fc->video_codec_id ? codec_get_id(codec_movvideo_tags, format) != c->fc->video_codec_id

  595.                                    : st->codec->codec_tag != MKTAG('j', 'p', 'e', 'g'))

  596.            ){

  597.             /* multiple fourcc, we skip jpeg, this isnt correct, we should export it as

  598.                seperate AVStream but this needs a few changes in the mov demuxer, patch

  599.                welcome */

  600.             url_fskip(pb, size - (url_ftell(pb) - start_pos));

  601.             continue;

  602.         }

  603.         sc->pseudo_stream_id= pseudo_stream_id;

  604. 

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

  606.         id = codec_get_id(codec_movaudio_tags, format);

  607.         if (id<=0 && (format&0xFFFF) == 'm' + ('s'<<8))

  608.             id = codec_get_id(codec_wav_tags, bswap_32(format)&0xFFFF);

  609. 

  610.         if (st->codec->codec_type != CODEC_TYPE_VIDEO && id > 0) {

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

  612.         } else if (st->codec->codec_type != CODEC_TYPE_AUDIO && /* do not overwrite codec type */

  613.                    format && format != MKTAG('m', 'p', '4', 's')) { /* skip old asf mpeg4 tag */

  614.             id = codec_get_id(codec_movvideo_tags, format);

  615.             if (id <= 0)

  616.                 id = codec_get_id(codec_bmp_tags, format);

  617.             if (id > 0)

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

  619.             else if(st->codec->codec_type == CODEC_TYPE_DATA){

  620.                 id = codec_get_id(ff_codec_movsubtitle_tags, format);

  621.                 if(id > 0)

  622.                     st->codec->codec_type = CODEC_TYPE_SUBTITLE;

  623.             }

  624.         }

  625. 

  626.         dprintf(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,

  627.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,

  628.                 (format >> 24) & 0xff, st->codec->codec_type);

  629. 

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

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

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

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

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

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

  636.             get_be32(pb); /* spatial quality */

  637. 

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

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

  640. 

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

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

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

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

  645. 

  646.             dprintf(c->fc, "frames/samples = %d\n", frames_per_sample);

  647. 

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

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

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

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

  652.             }

  653. 

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

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

  656. 

  657.             /* figure out the palette situation */

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

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

  660. 

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

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

  663.                 (color_depth == 8)) {

  664.                 if (color_greyscale) {

  665.                     /* compute the greyscale palette */

  666.                     color_count = 1 << color_depth;

  667.                     color_index = 255;

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

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

  670.                         r = g = b = color_index;

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

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

  673.                         color_index -= color_dec;

  674.                         if (color_index < 0)

  675.                             color_index = 0;

  676.                     }

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

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

  679.                     color_count = 1 << color_depth;

  680.                     if (color_depth == 2)

  681.                         color_table = ff_qt_default_palette_4;

  682.                     else if (color_depth == 4)

  683.                         color_table = ff_qt_default_palette_16;

  684.                     else

  685.                         color_table = ff_qt_default_palette_256;

  686. 

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

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

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

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

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

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

  693.                     }

  694.                 } else {

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

  696.                     color_start = get_be32(pb);

  697.                     color_count = get_be16(pb);

  698.                     color_end = get_be16(pb);

  699.                     if ((color_start <= 255) &&

  700.                         (color_end <= 255)) {

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

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

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

  704.                              * up front */

  705.                             get_byte(pb);

  706.                             get_byte(pb);

  707.                             r = get_byte(pb);

  708.                             get_byte(pb);

  709.                             g = get_byte(pb);

  710.                             get_byte(pb);

  711.                             b = get_byte(pb);

  712.                             get_byte(pb);

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

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

  715.                         }

  716.                     }

  717.                 }

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

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

  720.             } else

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

  722.         } else if(st->codec->codec_type==CODEC_TYPE_AUDIO) {

  723.             int bits_per_sample;

  724.             uint16_t version = get_be16(pb);

  725. 

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

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

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

  729. 

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

  731.             dprintf(c->fc, "audio channels %d\n", st->codec->channels);

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

  733. 

  734.             sc->audio_cid = get_be16(pb);

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

  736. 

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

  738. 

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

  740.             case CODEC_ID_PCM_S8:

  741.             case CODEC_ID_PCM_U8:

  742.                 if (st->codec->bits_per_sample == 16)

  743.                     st->codec->codec_id = CODEC_ID_PCM_S16BE;

  744.                 break;

  745.             case CODEC_ID_PCM_S16LE:

  746.             case CODEC_ID_PCM_S16BE:

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

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

  749.                 else if (st->codec->bits_per_sample == 24)

  750.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  751.                 break;

  752.             /* set values for old format before stsd version 1 appeared */

  753.             case CODEC_ID_MACE3:

  754.                 sc->samples_per_frame = 6;

  755.                 sc->bytes_per_frame = 2*st->codec->channels;

  756.                 break;

  757.             case CODEC_ID_MACE6:

  758.                 sc->samples_per_frame = 6;

  759.                 sc->bytes_per_frame = 1*st->codec->channels;

  760.                 break;

  761.             case CODEC_ID_ADPCM_IMA_QT:

  762.                 sc->samples_per_frame = 64;

  763.                 sc->bytes_per_frame = 34*st->codec->channels;

  764.                 break;

  765.             default:

  766.                 break;

  767.             }

  768. 

  769.             //Read QT version 1 fields. In version 0 these do not exist.

  770.             dprintf(c->fc, "version =%d, isom =%d\n",version,c->isom);

  771.             if(!c->isom) {

  772.                 if(version==1) {

  773.                     sc->samples_per_frame = get_be32(pb);

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

  775.                     sc->bytes_per_frame = get_be32(pb);

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

  777.                 } else if(version==2) {

  778.                     get_be32(pb); /* sizeof struct only */

  779.                     st->codec->sample_rate = av_int2dbl(get_be64(pb)); /* float 64 */

  780.                     st->codec->channels = get_be32(pb);

  781.                     get_be32(pb); /* always 0x7F000000 */

  782.                     get_be32(pb); /* bits per channel if sound is uncompressed */

  783.                     get_be32(pb); /* lcpm format specific flag */

  784.                     get_be32(pb); /* bytes per audio packet if constant */

  785.                     get_be32(pb); /* lpcm frames per audio packet if constant */

  786.                 }

  787.             }

  788. 

  789.             bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);

  790.             if (bits_per_sample) {

  791.                 st->codec->bits_per_sample = bits_per_sample;

  792.                 sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;

  793.             }

  794.         } else if(st->codec->codec_type==CODEC_TYPE_SUBTITLE){

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

  796.         } else {

  797.             /* other codec type, just skip (rtp, mp4s, tmcd ...) */

  798.             url_fskip(pb, size - (url_ftell(pb) - start_pos));

  799.         }

  800.         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */

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

  802.         if (a.size > 8) {

  803.             if (mov_read_default(c, pb, a) < 0)

  804.                 return -1;

  805.         } else if (a.size > 0)

  806.             url_fskip(pb, a.size);

  807.     }

  808. 

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

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

  811.     }

  812. 

  813.     /* special codec parameters handling */

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

  815. #ifdef CONFIG_H261_DECODER

  816.     case CODEC_ID_H261:

  817. #endif

  818. #ifdef CONFIG_H263_DECODER

  819.     case CODEC_ID_H263:

  820. #endif

  821. #ifdef CONFIG_MPEG4_DECODER

  822.     case CODEC_ID_MPEG4:

  823. #endif

  824.         st->codec->width= 0; /* let decoder init width/height */

  825.         st->codec->height= 0;

  826.         break;

  827. #ifdef CONFIG_LIBFAAD

  828.     case CODEC_ID_AAC:

  829. #endif

  830. #ifdef CONFIG_VORBIS_DECODER

  831.     case CODEC_ID_VORBIS:

  832. #endif

  833.     case CODEC_ID_MP3ON4:

  834.         st->codec->sample_rate= 0; /* let decoder init parameters properly */

  835.         break;

  836. #ifdef CONFIG_DV_DEMUXER

  837.     case CODEC_ID_DVAUDIO:

  838.         c->dv_fctx = av_alloc_format_context();

  839.         c->dv_demux = dv_init_demux(c->dv_fctx);

  840.         if (!c->dv_demux) {

  841.             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");

  842.             return -1;

  843.         }

  844.         sc->dv_audio_container = 1;

  845.         st->codec->codec_id = CODEC_ID_PCM_S16LE;

  846.         break;

  847. #endif

  848.     /* no ifdef since parameters are always those */

  849.     case CODEC_ID_AMR_WB:

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

  851.         st->codec->channels= 1; /* really needed */

  852.         break;

  853.     case CODEC_ID_AMR_NB:

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

  855.         st->codec->channels= 1; /* really needed */

  856.         break;

  857.     case CODEC_ID_MP2:

  858.     case CODEC_ID_MP3:

  859.         st->codec->codec_type = CODEC_TYPE_AUDIO; /* force type after stsd for m1a hdlr */

  860.         st->need_parsing = AVSTREAM_PARSE_FULL;

  861.         break;

  862.     case CODEC_ID_ADPCM_MS:

  863.     case CODEC_ID_ADPCM_IMA_WAV:

  864.         st->codec->block_align = sc->bytes_per_frame;

  865.         break;

  866.     default:

  867.         break;

  868.     }

  869. 

  870.     return 0;

  871. }

  872. 

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

  874. {

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

  876.     MOVStreamContext *sc = st->priv_data;

  877.     unsigned int i, entries;

  878. 

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

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

  881. 

  882.     entries = get_be32(pb);

  883. 

  884.     if(entries >= UINT_MAX / sizeof(MOV_stsc_t))

  885.         return -1;

  886. 

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

  888. 

  889.     sc->sample_to_chunk_sz = entries;

  890.     sc->sample_to_chunk = av_malloc(entries * sizeof(MOV_stsc_t));

  891.     if (!sc->sample_to_chunk)

  892.         return -1;

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

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

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

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

  897.     }

  898.     return 0;

  899. }

  900. 

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

  902. {

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

  904.     MOVStreamContext *sc = st->priv_data;

  905.     unsigned int i, entries;

  906. 

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

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

  909. 

  910.     entries = get_be32(pb);

  911. 

  912.     if(entries >= UINT_MAX / sizeof(int))

  913.         return -1;

  914. 

  915.     sc->keyframe_count = entries;

  916. 

  917.     dprintf(c->fc, "keyframe_count = %d\n", sc->keyframe_count);

  918. 

  919.     sc->keyframes = av_malloc(entries * sizeof(int));

  920.     if (!sc->keyframes)

  921.         return -1;

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

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

  924.         //dprintf(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);

  925.     }

  926.     return 0;

  927. }

  928. 

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

  930. {

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

  932.     MOVStreamContext *sc = st->priv_data;

  933.     unsigned int i, entries, sample_size;

  934. 

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

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

  937. 

  938.     sample_size = get_be32(pb);

  939.     if (!sc->sample_size) /* do not overwrite value computed in stsd */

  940.         sc->sample_size = sample_size;

  941.     entries = get_be32(pb);

  942.     if(entries >= UINT_MAX / sizeof(int))

  943.         return -1;

  944. 

  945.     sc->sample_count = entries;

  946.     if (sample_size)

  947.         return 0;

  948. 

  949.     dprintf(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, sc->sample_count);

  950. 

  951.     sc->sample_sizes = av_malloc(entries * sizeof(int));

  952.     if (!sc->sample_sizes)

  953.         return -1;

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

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

  956.         dprintf(c->fc, "sample_sizes[]=%d\n", sc->sample_sizes[i]);

  957.     }

  958.     return 0;

  959. }

  960. 

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

  962. {

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

  964.     MOVStreamContext *sc = st->priv_data;

  965.     unsigned int i, entries;

  966.     int64_t duration=0;

  967.     int64_t total_sample_count=0;

  968. 

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

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

  971.     entries = get_be32(pb);

  972.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  973.         return -1;

  974. 

  975.     sc->stts_count = entries;

  976.     sc->stts_data = av_malloc(entries * sizeof(MOV_stts_t));

  977.     if (!sc->stts_data)

  978.         return -1;

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

  980. 

  981.     sc->time_rate=0;

  982. 

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

  984.         int sample_duration;

  985.         int sample_count;

  986. 

  987.         sample_count=get_be32(pb);

  988.         sample_duration = get_be32(pb);

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

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

  991. 

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

  993. 

  994.         dprintf(c->fc, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);

  995. 

  996.         duration+=(int64_t)sample_duration*sample_count;

  997.         total_sample_count+=sample_count;

  998.     }

  999. 

  1000.     st->nb_frames= total_sample_count;

  1001.     if(duration)

  1002.         st->duration= duration;

  1003.     return 0;

  1004. }

  1005. 

  1006. static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1007. {

  1008.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1009.     MOVStreamContext *sc = st->priv_data;

  1010.     unsigned int i, entries;

  1011. 

  1012.     get_byte(pb); /* version */

  1013.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1014.     entries = get_be32(pb);

  1015.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  1016.         return -1;

  1017. 

  1018.     sc->ctts_count = entries;

  1019.     sc->ctts_data = av_malloc(entries * sizeof(MOV_stts_t));

  1020.     if (!sc->ctts_data)

  1021.         return -1;

  1022.     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1023. 

  1024.     for(i=0; i<entries; i++) {

  1025.         int count    =get_be32(pb);

  1026.         int duration =get_be32(pb);

  1027. 

  1028.         if (duration < 0) {

  1029.             av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");

  1030.             sc->ctts_count = 0;

  1031.             url_fskip(pb, 8 * (entries - i - 1));

  1032.             break;

  1033.         }

  1034.         sc->ctts_data[i].count   = count;

  1035.         sc->ctts_data[i].duration= duration;

  1036. 

  1037.         sc->time_rate= ff_gcd(sc->time_rate, duration);

  1038.     }

  1039.     return 0;

  1040. }

  1041. 

  1042. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1043. {

  1044.     AVStream *st;

  1045.     MOVStreamContext *sc;

  1046. 

  1047.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1048.     if (!st) return -2;

  1049.     sc = av_mallocz(sizeof(MOVStreamContext));

  1050.     if (!sc) {

  1051.         av_free(st);

  1052.         return -1;

  1053.     }

  1054. 

  1055.     st->priv_data = sc;

  1056.     st->codec->codec_type = CODEC_TYPE_DATA;

  1057.     st->start_time = 0; /* XXX: check */

  1058. 

  1059.     return mov_read_default(c, pb, atom);

  1060. }

  1061. 

  1062. static void mov_parse_udta_string(ByteIOContext *pb, char *str, int size)

  1063. {

  1064.     uint16_t str_size = get_be16(pb); /* string length */;

  1065. 

  1066.     get_be16(pb); /* skip language */

  1067.     get_buffer(pb, str, FFMIN(size, str_size));

  1068. }

  1069. 

  1070. static int mov_read_udta(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1071. {

  1072.     uint64_t end = url_ftell(pb) + atom.size;

  1073. 

  1074.     while (url_ftell(pb) + 8 < end) {

  1075.         uint32_t tag_size = get_be32(pb);

  1076.         uint32_t tag      = get_le32(pb);

  1077.         uint64_t next     = url_ftell(pb) + tag_size - 8;

  1078. 

  1079.         if (next > end) // stop if tag_size is wrong

  1080.             break;

  1081. 

  1082.         switch (tag) {

  1083.         case MKTAG(0xa9,'n','a','m'):

  1084.             mov_parse_udta_string(pb, c->fc->title,     sizeof(c->fc->title));

  1085.             break;

  1086.         case MKTAG(0xa9,'w','r','t'):

  1087.             mov_parse_udta_string(pb, c->fc->author,    sizeof(c->fc->author));

  1088.             break;

  1089.         case MKTAG(0xa9,'c','p','y'):

  1090.             mov_parse_udta_string(pb, c->fc->copyright, sizeof(c->fc->copyright));

  1091.             break;

  1092.         case MKTAG(0xa9,'i','n','f'):

  1093.             mov_parse_udta_string(pb, c->fc->comment,   sizeof(c->fc->comment));

  1094.             break;

  1095.         default:

  1096.             break;

  1097.         }

  1098. 

  1099.         url_fseek(pb, next, SEEK_SET);

  1100.     }

  1101. 

  1102.     return 0;

  1103. }

  1104. 

  1105. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1106. {

  1107.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1108.     int version = get_byte(pb);

  1109. 

  1110.     get_byte(pb); get_byte(pb);

  1111.     get_byte(pb); /* flags */

  1112.     /*

  1113.     MOV_TRACK_ENABLED 0x0001

  1114.     MOV_TRACK_IN_MOVIE 0x0002

  1115.     MOV_TRACK_IN_PREVIEW 0x0004

  1116.     MOV_TRACK_IN_POSTER 0x0008

  1117.     */

  1118. 

  1119.     if (version == 1) {

  1120.         get_be64(pb);

  1121.         get_be64(pb);

  1122.     } else {

  1123.         get_be32(pb); /* creation time */

  1124.         get_be32(pb); /* modification time */

  1125.     }

  1126.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1127.     get_be32(pb); /* reserved */

  1128.     st->start_time = 0; /* check */

  1129.     (version == 1) ? get_be64(pb) : get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

  1130.     get_be32(pb); /* reserved */

  1131.     get_be32(pb); /* reserved */

  1132. 

  1133.     get_be16(pb); /* layer */

  1134.     get_be16(pb); /* alternate group */

  1135.     get_be16(pb); /* volume */

  1136.     get_be16(pb); /* reserved */

  1137. 

  1138.     url_fskip(pb, 36); /* display matrix */

  1139. 

  1140.     /* those are fixed-point */

  1141.     get_be32(pb); /* track width */

  1142.     get_be32(pb); /* track height */

  1143. 

  1144.     return 0;

  1145. }

  1146. 

  1147. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1148. /* like the files created with Adobe Premiere 5.0, for samples see */

  1149. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1150. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1151. {

  1152.     int err;

  1153. 

  1154.     if (atom.size < 8)

  1155.         return 0; /* continue */

  1156.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1157.         url_fskip(pb, atom.size - 4);

  1158.         return 0;

  1159.     }

  1160.     atom.type = get_le32(pb);

  1161.     atom.offset += 8;

  1162.     atom.size -= 8;

  1163.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1164.         url_fskip(pb, atom.size);

  1165.         return 0;

  1166.     }

  1167.     err = mov_read_mdat(c, pb, atom);

  1168.     return err;

  1169. }

  1170. 

  1171. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1172. {

  1173. #ifdef CONFIG_ZLIB

  1174.     ByteIOContext ctx;

  1175.     uint8_t *cmov_data;

  1176.     uint8_t *moov_data; /* uncompressed data */

  1177.     long cmov_len, moov_len;

  1178.     int ret;

  1179. 

  1180.     get_be32(pb); /* dcom atom */

  1181.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1182.         return -1;

  1183.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1184.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1185.         return -1;

  1186.     }

  1187.     get_be32(pb); /* cmvd atom */

  1188.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1189.         return -1;

  1190.     moov_len = get_be32(pb); /* uncompressed size */

  1191.     cmov_len = atom.size - 6 * 4;

  1192. 

  1193.     cmov_data = av_malloc(cmov_len);

  1194.     if (!cmov_data)

  1195.         return -1;

  1196.     moov_data = av_malloc(moov_len);

  1197.     if (!moov_data) {

  1198.         av_free(cmov_data);

  1199.         return -1;

  1200.     }

  1201.     get_buffer(pb, cmov_data, cmov_len);

  1202.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1203.         return -1;

  1204.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  1205.         return -1;

  1206.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1207.     atom.offset = 0;

  1208.     atom.size = moov_len;

  1209. #ifdef DEBUG

  1210. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1211. #endif

  1212.     ret = mov_read_default(c, &ctx, atom);

  1213.     av_free(moov_data);

  1214.     av_free(cmov_data);

  1215.     return ret;

  1216. #else

  1217.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  1218.     return -1;

  1219. #endif

  1220. }

  1221. 

  1222. /* edit list atom */

  1223. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1224. {

  1225.     MOVStreamContext *sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  1226.     int i, edit_count;

  1227. 

  1228.     get_byte(pb); /* version */

  1229.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1230.     edit_count= sc->edit_count = get_be32(pb);     /* entries */

  1231. 

  1232.     for(i=0; i<edit_count; i++){

  1233.         int time;

  1234.         get_be32(pb); /* Track duration */

  1235.         time = get_be32(pb); /* Media time */

  1236.         get_be32(pb); /* Media rate */

  1237.         if (time != 0)

  1238.             av_log(c->fc, AV_LOG_WARNING, "edit list not starting at 0, "

  1239.                    "a/v desync might occur, patch welcome\n");

  1240.     }

  1241.     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, sc->edit_count);

  1242.     return 0;

  1243. }

  1244. 

  1245. static const MOVParseTableEntry mov_default_parse_table[] = {

  1246. /* mp4 atoms */

  1247. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1248. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1249. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1250. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1251. { MKTAG( 'e', 'n', 'd', 'a' ), mov_read_enda },

  1252. { MKTAG( 'f', 'i', 'e', 'l' ), mov_read_extradata },

  1253. { MKTAG( 'f', 't', 'y', 'p' ), mov_read_ftyp },

  1254. { MKTAG( 'g', 'l', 'b', 'l' ), mov_read_glbl },

  1255. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1256. { MKTAG( 'j', 'p', '2', 'h' ), mov_read_extradata },

  1257. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1258. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1259. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1260. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1261. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1262. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1263. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1264. { MKTAG( 'a', 'l', 'a', 'c' ), mov_read_extradata }, /* alac specific atom */

  1265. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_glbl },

  1266. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1267. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1268. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1269. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1270. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1271. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1272. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1273. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1274. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1275. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_udta },

  1276. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1277. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1278. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1279. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1280. { 0, NULL }

  1281. };

  1282. 

  1283. /* XXX: is it sufficient ? */

  1284. static int mov_probe(AVProbeData *p)

  1285. {

  1286.     unsigned int offset;

  1287.     uint32_t tag;

  1288.     int score = 0;

  1289. 

  1290.     /* check file header */

  1291.     offset = 0;

  1292.     for(;;) {

  1293.         /* ignore invalid offset */

  1294.         if ((offset + 8) > (unsigned int)p->buf_size)

  1295.             return score;

  1296.         tag = AV_RL32(p->buf + offset + 4);

  1297.         switch(tag) {

  1298.         /* check for obvious tags */

  1299.         case MKTAG( 'j', 'P', ' ', ' ' ): /* jpeg 2000 signature */

  1300.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1301.         case MKTAG( 'm', 'd', 'a', 't' ):

  1302.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1303.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1304.             return AVPROBE_SCORE_MAX;

  1305.         /* those are more common words, so rate then a bit less */

  1306.         case MKTAG( 'e', 'd', 'i', 'w' ): /* xdcam files have reverted first tags */

  1307.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1308.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1309.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1310.         case MKTAG( 'p', 'i', 'c', 't' ):

  1311.             return AVPROBE_SCORE_MAX - 5;

  1312.         case MKTAG( 'f', 't', 'y', 'p' ):

  1313.         case MKTAG( 's', 'k', 'i', 'p' ):

  1314.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1315.             offset = AV_RB32(p->buf+offset) + offset;

  1316.             /* if we only find those cause probedata is too small at least rate them */

  1317.             score = AVPROBE_SCORE_MAX - 50;

  1318.             break;

  1319.         default:

  1320.             /* unrecognized tag */

  1321.             return score;

  1322.         }

  1323.     }

  1324.     return score;

  1325. }

  1326. 

  1327. static void mov_build_index(MOVContext *mov, AVStream *st)

  1328. {

  1329.     MOVStreamContext *sc = st->priv_data;

  1330.     offset_t current_offset;

  1331.     int64_t current_dts = 0;

  1332.     unsigned int stts_index = 0;

  1333.     unsigned int stsc_index = 0;

  1334.     unsigned int stss_index = 0;

  1335.     unsigned int i, j;

  1336. 

  1337.     if (sc->sample_sizes || st->codec->codec_type == CODEC_TYPE_VIDEO ||

  1338.         sc->audio_cid == -2) {

  1339.         unsigned int current_sample = 0;

  1340.         unsigned int stts_sample = 0;

  1341.         unsigned int keyframe, sample_size;

  1342.         unsigned int distance = 0;

  1343. 

  1344.         st->nb_frames = sc->sample_count;

  1345.         for (i = 0; i < sc->chunk_count; i++) {

  1346.             current_offset = sc->chunk_offsets[i];

  1347.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1348.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1349.                 stsc_index++;

  1350.             for (j = 0; j < sc->sample_to_chunk[stsc_index].count; j++) {

  1351.                 if (current_sample >= sc->sample_count) {

  1352.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1353.                     goto out;

  1354.                 }

  1355.                 keyframe = !sc->keyframe_count || current_sample + 1 == sc->keyframes[stss_index];

  1356.                 if (keyframe) {

  1357.                     distance = 0;

  1358.                     if (stss_index + 1 < sc->keyframe_count)

  1359.                         stss_index++;

  1360.                 }

  1361.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1362.                 dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1363.                         "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1364.                         current_offset, current_dts, sample_size, distance, keyframe);

  1365.                 if(sc->sample_to_chunk[stsc_index].id - 1 == sc->pseudo_stream_id)

  1366.                     av_add_index_entry(st, current_offset, current_dts, sample_size, distance,

  1367.                                     keyframe ? AVINDEX_KEYFRAME : 0);

  1368.                 current_offset += sample_size;

  1369.                 assert(sc->stts_data[stts_index].duration % sc->time_rate == 0);

  1370.                 current_dts += sc->stts_data[stts_index].duration / sc->time_rate;

  1371.                 distance++;

  1372.                 stts_sample++;

  1373.                 current_sample++;

  1374.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1375.                     stts_sample = 0;

  1376.                     stts_index++;

  1377.                 }

  1378.             }

  1379.         }

  1380.     } else { /* read whole chunk */

  1381.         unsigned int chunk_samples, chunk_size, chunk_duration;

  1382.         unsigned int frames = 1;

  1383.         for (i = 0; i < sc->chunk_count; i++) {

  1384.             current_offset = sc->chunk_offsets[i];

  1385.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1386.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1387.                 stsc_index++;

  1388.             chunk_samples = sc->sample_to_chunk[stsc_index].count;

  1389.             /* get chunk size, beware of alaw/ulaw/mace */

  1390.             if (sc->samples_per_frame > 0 &&

  1391.                 (chunk_samples * sc->bytes_per_frame % sc->samples_per_frame == 0)) {

  1392.                 if (sc->samples_per_frame < 1024)

  1393.                     chunk_size = chunk_samples * sc->bytes_per_frame / sc->samples_per_frame;

  1394.                 else {

  1395.                     chunk_size = sc->bytes_per_frame;

  1396.                     frames = chunk_samples / sc->samples_per_frame;

  1397.                     chunk_samples = sc->samples_per_frame;

  1398.                 }

  1399.             } else if (sc->sample_size > 1 || st->codec->bits_per_sample == 8) {

  1400.                 chunk_size = chunk_samples * sc->sample_size;

  1401.             } else {

  1402.                 av_log(mov->fc, AV_LOG_ERROR, "could not determine chunk size, report problem\n");

  1403.                 goto out;

  1404.             }

  1405.             for (j = 0; j < frames; j++) {

  1406.             av_add_index_entry(st, current_offset, current_dts, chunk_size, 0, AVINDEX_KEYFRAME);

  1407.             /* get chunk duration */

  1408.             chunk_duration = 0;

  1409.             while (chunk_samples > 0) {

  1410.                 if (chunk_samples < sc->stts_data[stts_index].count) {

  1411.                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1412.                     sc->stts_data[stts_index].count -= chunk_samples;

  1413.                     break;

  1414.                 } else {

  1415.                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1416.                     chunk_samples -= sc->stts_data[stts_index].count;

  1417.                     if (stts_index + 1 < sc->stts_count)

  1418.                         stts_index++;

  1419.                 }

  1420.             }

  1421.             current_offset += sc->bytes_per_frame;

  1422.             dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", size %d, "

  1423.                     "duration %d\n", st->index, i, current_offset, current_dts, chunk_size, chunk_duration);

  1424.             assert(chunk_duration % sc->time_rate == 0);

  1425.             current_dts += chunk_duration / sc->time_rate;

  1426.             }

  1427.         }

  1428.     }

  1429.  out:

  1430.     /* adjust sample count to avindex entries */

  1431.     sc->sample_count = st->nb_index_entries;

  1432. }

  1433. 

  1434. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1435. {

  1436.     MOVContext *mov = s->priv_data;

  1437.     ByteIOContext *pb = s->pb;

  1438.     int i, err;

  1439.     MOV_atom_t atom = { 0, 0, 0 };

  1440. 

  1441.     mov->fc = s;

  1442. 

  1443.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1444.         atom.size = url_fsize(pb);

  1445.     else

  1446.         atom.size = INT64_MAX;

  1447. 

  1448.     /* check MOV header */

  1449.     err = mov_read_default(mov, pb, atom);

  1450.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1451.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1452.                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1453.         return -1;

  1454.     }

  1455.     dprintf(mov->fc, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1456. 

  1457.     for(i=0; i<s->nb_streams; i++) {

  1458.         AVStream *st = s->streams[i];

  1459.         MOVStreamContext *sc = st->priv_data;

  1460.         /* sanity checks */

  1461.         if(!sc->stts_count || !sc->chunk_count || !sc->sample_to_chunk_sz ||

  1462.            (!sc->sample_size && !sc->sample_count)){

  1463.             av_log(s, AV_LOG_ERROR, "missing mandatory atoms, broken header\n");

  1464.             sc->sample_count = 0; //ignore track

  1465.             continue;

  1466.         }

  1467.         if(!sc->time_rate)

  1468.             sc->time_rate=1;

  1469.         if(!sc->time_scale)

  1470.             sc->time_scale= mov->time_scale;

  1471.         av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);

  1472. 

  1473.         if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)

  1474.             st->codec->frame_size = sc->stts_data[0].duration;

  1475. 

  1476.         if(st->duration != AV_NOPTS_VALUE){

  1477.             assert(st->duration % sc->time_rate == 0);

  1478.             st->duration /= sc->time_rate;

  1479.         }

  1480.         sc->ffindex = i;

  1481.         mov_build_index(mov, st);

  1482.     }

  1483. 

  1484.     for(i=0; i<s->nb_streams; i++) {

  1485.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1486.         /* Do not need those anymore. */

  1487.         av_freep(&sc->chunk_offsets);

  1488.         av_freep(&sc->sample_to_chunk);

  1489.         av_freep(&sc->sample_sizes);

  1490.         av_freep(&sc->keyframes);

  1491.         av_freep(&sc->stts_data);

  1492.     }

  1493.     return 0;

  1494. }

  1495. 

  1496. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1497. {

  1498.     MOVContext *mov = s->priv_data;

  1499.     MOVStreamContext *sc = 0;

  1500.     AVIndexEntry *sample = 0;

  1501.     int64_t best_dts = INT64_MAX;

  1502.     int i;

  1503. 

  1504.     for (i = 0; i < s->nb_streams; i++) {

  1505.         AVStream *st = s->streams[i];

  1506.         MOVStreamContext *msc = st->priv_data;

  1507.         if (st->discard != AVDISCARD_ALL && msc->current_sample < msc->sample_count) {

  1508.             AVIndexEntry *current_sample = &st->index_entries[msc->current_sample];

  1509.             int64_t dts = av_rescale(current_sample->timestamp * (int64_t)msc->time_rate,

  1510.                                      AV_TIME_BASE, msc->time_scale);

  1511.             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  1512.             if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||

  1513.                 (!url_is_streamed(s->pb) &&

  1514.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  1515.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))) {

  1516.                 sample = current_sample;

  1517.                 best_dts = dts;

  1518.                 sc = msc;

  1519.             }

  1520.         }

  1521.     }

  1522.     if (!sample)

  1523.         return -1;

  1524.     /* must be done just before reading, to avoid infinite loop on sample */

  1525.     sc->current_sample++;

  1526.     if (url_fseek(s->pb, sample->pos, SEEK_SET) != sample->pos) {

  1527.         av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  1528.                sc->ffindex, sample->pos);

  1529.         return -1;

  1530.     }

  1531.     av_get_packet(s->pb, pkt, sample->size);

  1532. #ifdef CONFIG_DV_DEMUXER

  1533.     if (mov->dv_demux && sc->dv_audio_container) {

  1534.         dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  1535.         av_free(pkt->data);

  1536.         pkt->size = 0;

  1537.         if (dv_get_packet(mov->dv_demux, pkt) < 0)

  1538.             return -1;

  1539.     }

  1540. #endif

  1541.     pkt->stream_index = sc->ffindex;

  1542.     pkt->dts = sample->timestamp;

  1543.     if (sc->ctts_data) {

  1544.         assert(sc->ctts_data[sc->sample_to_ctime_index].duration % sc->time_rate == 0);

  1545.         pkt->pts = pkt->dts + sc->ctts_data[sc->sample_to_ctime_index].duration / sc->time_rate;

  1546.         /* update ctts context */

  1547.         sc->sample_to_ctime_sample++;

  1548.         if (sc->sample_to_ctime_index < sc->ctts_count &&

  1549.             sc->ctts_data[sc->sample_to_ctime_index].count == sc->sample_to_ctime_sample) {

  1550.             sc->sample_to_ctime_index++;

  1551.             sc->sample_to_ctime_sample = 0;

  1552.         }

  1553.     } else {

  1554.         pkt->pts = pkt->dts;

  1555.     }

  1556.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? PKT_FLAG_KEY : 0;

  1557.     pkt->pos = sample->pos;

  1558.     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  1559.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  1560.     return 0;

  1561. }

  1562. 

  1563. static int mov_seek_stream(AVStream *st, int64_t timestamp, int flags)

  1564. {

  1565.     MOVStreamContext *sc = st->priv_data;

  1566.     int sample, time_sample;

  1567.     int i;

  1568. 

  1569.     sample = av_index_search_timestamp(st, timestamp, flags);

  1570.     dprintf(st->codec, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  1571.     if (sample < 0) /* not sure what to do */

  1572.         return -1;

  1573.     sc->current_sample = sample;

  1574.     dprintf(st->codec, "stream %d, found sample %d\n", st->index, sc->current_sample);

  1575.     /* adjust ctts index */

  1576.     if (sc->ctts_data) {

  1577.         time_sample = 0;

  1578.         for (i = 0; i < sc->ctts_count; i++) {

  1579.             int next = time_sample + sc->ctts_data[i].count;

  1580.             if (next > sc->current_sample) {

  1581.                 sc->sample_to_ctime_index = i;

  1582.                 sc->sample_to_ctime_sample = sc->current_sample - time_sample;

  1583.                 break;

  1584.             }

  1585.             time_sample = next;

  1586.         }

  1587.     }

  1588.     return sample;

  1589. }

  1590. 

  1591. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1592. {

  1593.     AVStream *st;

  1594.     int64_t seek_timestamp, timestamp;

  1595.     int sample;

  1596.     int i;

  1597. 

  1598.     if (stream_index >= s->nb_streams)

  1599.         return -1;

  1600. 

  1601.     st = s->streams[stream_index];

  1602.     sample = mov_seek_stream(st, sample_time, flags);

  1603.     if (sample < 0)

  1604.         return -1;

  1605. 

  1606.     /* adjust seek timestamp to found sample timestamp */

  1607.     seek_timestamp = st->index_entries[sample].timestamp;

  1608. 

  1609.     for (i = 0; i < s->nb_streams; i++) {

  1610.         st = s->streams[i];

  1611.         if (stream_index == i || st->discard == AVDISCARD_ALL)

  1612.             continue;

  1613. 

  1614.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  1615.         mov_seek_stream(st, timestamp, flags);

  1616.     }

  1617.     return 0;

  1618. }

  1619. 

  1620. static int mov_read_close(AVFormatContext *s)

  1621. {

  1622.     int i;

  1623.     MOVContext *mov = s->priv_data;

  1624.     for(i=0; i<s->nb_streams; i++) {

  1625.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1626.         av_freep(&sc->ctts_data);

  1627.     }

  1628.     if(mov->dv_demux){

  1629.         for(i=0; i<mov->dv_fctx->nb_streams; i++){

  1630.             av_freep(&mov->dv_fctx->streams[i]->codec);

  1631.             av_freep(&mov->dv_fctx->streams[i]);

  1632.         }

  1633.         av_freep(&mov->dv_fctx);

  1634.         av_freep(&mov->dv_demux);

  1635.     }

  1636.     return 0;

  1637. }

  1638. 

  1639. AVInputFormat mov_demuxer = {

  1640.     "mov,mp4,m4a,3gp,3g2,mj2",

  1641.     "QuickTime/MPEG4/Motion JPEG 2000 format",

  1642.     sizeof(MOVContext),

  1643.     mov_probe,

  1644.     mov_read_header,

  1645.     mov_read_packet,

  1646.     mov_read_close,

  1647.     mov_read_seek,

  1648. };