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FFmpeg/libavformat/mov.c

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  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.     char *path;

  75. } MOV_dref_t;

  76. 

  77. typedef struct {

  78.     uint32_t type;

  79.     int64_t offset;

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

  81. } MOV_atom_t;

  82. 

  83. struct MOVParseTableEntry;

  84. 

  85. typedef struct MOVStreamContext {

  86.     ByteIOContext *pb;

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

  88.     int next_chunk;

  89.     unsigned int chunk_count;

  90.     int64_t *chunk_offsets;

  91.     unsigned int stts_count;

  92.     MOV_stts_t *stts_data;

  93.     unsigned int ctts_count;

  94.     MOV_stts_t *ctts_data;

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

  96.     unsigned int sample_to_chunk_sz;

  97.     MOV_stsc_t *sample_to_chunk;

  98.     int sample_to_ctime_index;

  99.     int sample_to_ctime_sample;

  100.     unsigned int sample_size;

  101.     unsigned int sample_count;

  102.     int *sample_sizes;

  103.     unsigned int keyframe_count;

  104.     int *keyframes;

  105.     int time_scale;

  106.     int time_rate;

  107.     int current_sample;

  108.     unsigned int bytes_per_frame;

  109.     unsigned int samples_per_frame;

  110.     int dv_audio_container;

  111.     int pseudo_stream_id;

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

  113.     unsigned drefs_count;

  114.     MOV_dref_t *drefs;

  115.     int dref_id;

  116. } MOVStreamContext;

  117. 

  118. typedef struct MOVContext {

  119.     AVFormatContext *fc;

  120.     int time_scale;

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

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

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

  124.     AVPaletteControl palette_control;

  125.     DVDemuxContext *dv_demux;

  126.     AVFormatContext *dv_fctx;

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

  128. } MOVContext;

  129. 

  130. 

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

  132. 

  133. /* those functions parse an atom */

  134. /* return code:

  135.  1: found what I wanted, exit

  136.  0: continue to parse next atom

  137.  -1: error occured, exit

  138.  */

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

  140. typedef struct MOVParseTableEntry {

  141.     uint32_t type;

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

  143. } MOVParseTableEntry;

  144. 

  145. static const MOVParseTableEntry mov_default_parse_table[];

  146. 

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

  148. {

  149.     int64_t total_size = 0;

  150.     MOV_atom_t a;

  151.     int i;

  152.     int err = 0;

  153. 

  154.     a.offset = atom.offset;

  155. 

  156.     if (atom.size < 0)

  157.         atom.size = INT64_MAX;

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

  159.         a.size = atom.size;

  160.         a.type=0;

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

  162.             a.size = get_be32(pb);

  163.             a.type = get_le32(pb);

  164.         }

  165.         total_size += 8;

  166.         a.offset += 8;

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

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

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

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

  171.             a.offset += 8;

  172.             total_size += 8;

  173.         }

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

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

  176.             if (a.size <= 8)

  177.                 break;

  178.         }

  179.         a.size -= 8;

  180.         if(a.size < 0)

  181.             break;

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

  183. 

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

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

  186.             /* empty */;

  187. 

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

  189.             url_fskip(pb, a.size);

  190.         } else {

  191.             offset_t start_pos = url_ftell(pb);

  192.             int64_t left;

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

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

  195.                 break;

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

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

  198.                 url_fskip(pb, left);

  199.         }

  200. 

  201.         a.offset += a.size;

  202.         total_size += a.size;

  203.     }

  204. 

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

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

  207.     }

  208. 

  209.     return err;

  210. }

  211. 

  212. static int mov_read_dref(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  213. {

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

  215.     MOVStreamContext *sc = st->priv_data;

  216.     int entries, i, j;

  217. 

  218.     get_be32(pb); // version + flags

  219.     entries = get_be32(pb);

  220.     if (entries >= UINT_MAX / sizeof(*sc->drefs))

  221.         return -1;

  222.     sc->drefs_count = entries;

  223.     sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));

  224. 

  225.     for (i = 0; i < sc->drefs_count; i++) {

  226.         MOV_dref_t *dref = &sc->drefs[i];

  227.         uint32_t size = get_be32(pb);

  228.         offset_t next = url_ftell(pb) + size - 4;

  229. 

  230.         dref->type = get_le32(pb);

  231.         get_be32(pb); // version + flags

  232.         dprintf(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);

  233. 

  234.         if (dref->type == MKTAG('a','l','i','s') && size > 150) {

  235.             /* macintosh alias record */

  236.             uint16_t volume_len, len;

  237.             char volume[28];

  238.             int16_t type;

  239. 

  240.             url_fskip(pb, 10);

  241. 

  242.             volume_len = get_byte(pb);

  243.             volume_len = FFMIN(volume_len, 27);

  244.             get_buffer(pb, volume, 27);

  245.             volume[volume_len] = 0;

  246.             av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", volume, volume_len);

  247. 

  248.             url_fskip(pb, 112);

  249. 

  250.             for (type = 0; type != -1 && url_ftell(pb) < next; ) {

  251.                 type = get_be16(pb);

  252.                 len = get_be16(pb);

  253.                 av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);

  254.                 if (len&1)

  255.                     len += 1;

  256.                 if (type == 2) { // absolute path

  257.                     av_free(dref->path);

  258.                     dref->path = av_mallocz(len+1);

  259.                     if (!dref->path)

  260.                         return AVERROR(ENOMEM);

  261.                     get_buffer(pb, dref->path, len);

  262.                     if (len > volume_len && !strncmp(dref->path, volume, volume_len)) {

  263.                         len -= volume_len;

  264.                         memmove(dref->path, dref->path+volume_len, len);

  265.                         dref->path[len] = 0;

  266.                     }

  267.                     for (j = 0; j < len; j++)

  268.                         if (dref->path[j] == ':')

  269.                             dref->path[j] = '/';

  270.                     av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);

  271.                 } else

  272.                     url_fskip(pb, len);

  273.             }

  274.         }

  275.         url_fseek(pb, next, SEEK_SET);

  276.     }

  277.     return 0;

  278. }

  279. 

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

  281. {

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

  283.     uint32_t type;

  284.     uint32_t ctype;

  285. 

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

  287.     get_be24(pb); /* flags */

  288. 

  289.     /* component type */

  290.     ctype = get_le32(pb);

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

  292. 

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

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

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

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

  297.     if(!ctype)

  298.         c->isom = 1;

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

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

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

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

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

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

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

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

  307.     }

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

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

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

  311. 

  312.     if(atom.size <= 24)

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

  314. 

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

  316.     return 0;

  317. }

  318. 

  319. static int mp4_read_descr_len(ByteIOContext *pb)

  320. {

  321.     int len = 0;

  322.     int count = 4;

  323.     while (count--) {

  324.         int c = get_byte(pb);

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

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

  327.             break;

  328.     }

  329.     return len;

  330. }

  331. 

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

  333. {

  334.     int len;

  335.     *tag = get_byte(pb);

  336.     len = mp4_read_descr_len(pb);

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

  338.     return len;

  339. }

  340. 

  341. #define MP4ESDescrTag                   0x03

  342. #define MP4DecConfigDescrTag            0x04

  343. #define MP4DecSpecificDescrTag          0x05

  344. 

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

  346. {

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

  348.     int tag, len;

  349. 

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

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

  352.     if (tag == MP4ESDescrTag) {

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

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

  355.     } else

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

  357. 

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

  359.     if (tag == MP4DecConfigDescrTag) {

  360.         int object_type_id = get_byte(pb);

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

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

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

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

  365. 

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

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

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

  369.         if (tag == MP4DecSpecificDescrTag) {

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

  371.             if((uint64_t)len > (1<<30))

  372.                 return -1;

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

  374.             if (!st->codec->extradata)

  375.                 return AVERROR(ENOMEM);

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

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

  378.             /* from mplayer */

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

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

  381.             }

  382.         }

  383.     }

  384.     return 0;

  385. }

  386. 

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

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

  389. {

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

  391.         return 0;

  392.     c->found_mdat=1;

  393.     if(c->found_moov)

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

  395.     url_fskip(pb, atom.size);

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

  397. }

  398. 

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

  400. {

  401.     uint32_t type = get_le32(pb);

  402. 

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

  404.         c->isom = 1;

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

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

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

  408.     return 0;

  409. }

  410. 

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

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

  413. {

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

  415.         return -1;

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

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

  418.     c->found_moov=1;

  419.     if(c->found_mdat)

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

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

  422. }

  423. 

  424. 

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

  426. {

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

  428.     MOVStreamContext *sc = st->priv_data;

  429.     int version = get_byte(pb);

  430.     int lang;

  431. 

  432.     if (version > 1)

  433.         return 1; /* unsupported */

  434. 

  435.     get_be24(pb); /* flags */

  436.     if (version == 1) {

  437.         get_be64(pb);

  438.         get_be64(pb);

  439.     } else {

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

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

  442.     }

  443. 

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

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

  446. 

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

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

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

  450. 

  451.     return 0;

  452. }

  453. 

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

  455. {

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

  457.     get_be24(pb); /* flags */

  458. 

  459.     if (version == 1) {

  460.         get_be64(pb);

  461.         get_be64(pb);

  462.     } else {

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

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

  465.     }

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

  467. 

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

  469. 

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

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

  472. 

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

  474. 

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

  476. 

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

  478. 

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

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

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

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

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

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

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

  486. 

  487.     return 0;

  488. }

  489. 

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

  491. {

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

  493. 

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

  495.         return -1;

  496. 

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

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

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

  500.     st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);

  501.     if (!st->codec->extradata)

  502.         return AVERROR(ENOMEM);

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

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

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

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

  507.     return 0;

  508. }

  509. 

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

  511. {

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

  513.     int little_endian = get_be16(pb);

  514. 

  515.     if (little_endian) {

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

  517.         case CODEC_ID_PCM_S24BE:

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

  519.             break;

  520.         case CODEC_ID_PCM_S32BE:

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

  522.             break;

  523.         default:

  524.             break;

  525.         }

  526.     }

  527.     return 0;

  528. }

  529. 

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

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

  532. {

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

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

  535.     uint8_t *buf;

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

  537.         return -1;

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

  539.     if(!buf)

  540.         return -1;

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

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

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

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

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

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

  547.     return 0;

  548. }

  549. 

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

  551. {

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

  553. 

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

  555.         return -1;

  556. 

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

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

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

  560.         st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);

  561.         if (!st->codec->extradata)

  562.             return AVERROR(ENOMEM);

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

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

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

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

  567.             return -1;

  568.     } else

  569.         url_fskip(pb, atom.size);

  570.     return 0;

  571. }

  572. 

  573. /**

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

  575.  * nor size unlike mov_read_extradata.

  576.  */

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

  578. {

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

  580. 

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

  582.         return -1;

  583. 

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

  585.     st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);

  586.     if (!st->codec->extradata)

  587.         return AVERROR(ENOMEM);

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

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

  590.     return 0;

  591. }

  592. 

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

  594. {

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

  596.     MOVStreamContext *sc = st->priv_data;

  597.     unsigned int i, entries;

  598. 

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

  600.     get_be24(pb); /* flags */

  601. 

  602.     entries = get_be32(pb);

  603. 

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

  605.         return -1;

  606. 

  607.     sc->chunk_count = entries;

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

  609.     if (!sc->chunk_offsets)

  610.         return -1;

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

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

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

  614.         }

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

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

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

  618.         }

  619.     } else

  620.         return -1;

  621. 

  622.     return 0;

  623. }

  624. 

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

  626. {

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

  628.     MOVStreamContext *sc = st->priv_data;

  629.     int entries, frames_per_sample;

  630.     uint32_t format;

  631.     uint8_t codec_name[32];

  632. 

  633.     /* for palette traversal */

  634.     unsigned int color_depth;

  635.     unsigned int color_start;

  636.     unsigned int color_count;

  637.     unsigned int color_end;

  638.     int color_index;

  639.     int color_dec;

  640.     int color_greyscale;

  641.     const uint8_t *color_table;

  642.     int j, pseudo_stream_id;

  643.     unsigned char r, g, b;

  644. 

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

  646.     get_be24(pb); /* flags */

  647. 

  648.     entries = get_be32(pb);

  649. 

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

  651.         enum CodecID id;

  652.         int dref_id;

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

  654.         offset_t start_pos = url_ftell(pb);

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

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

  657. 

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

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

  660.         dref_id = get_be16(pb);

  661. 

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

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

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

  665.            ){

  666.             /* Multiple fourcc, we skip JPEG. This is not correct, we should

  667.              * export it as a separate AVStream but this needs a few changes

  668.              * in the MOV demuxer, patch welcome. */

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

  670.             continue;

  671.         }

  672.         sc->pseudo_stream_id= pseudo_stream_id;

  673.         sc->dref_id= dref_id;

  674. 

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

  676.         id = codec_get_id(codec_movaudio_tags, format);

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

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

  679. 

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

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

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

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

  684.             id = codec_get_id(codec_movvideo_tags, format);

  685.             if (id <= 0)

  686.                 id = codec_get_id(codec_bmp_tags, format);

  687.             if (id > 0)

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

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

  690.                 id = codec_get_id(ff_codec_movsubtitle_tags, format);

  691.                 if(id > 0)

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

  693.             }

  694.         }

  695. 

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

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

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

  699. 

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

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

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

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

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

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

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

  707. 

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

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

  710. 

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

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

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

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

  715. 

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

  717. 

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

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

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

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

  722.             }

  723. 

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

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

  726.             dprintf(c->fc, "depth %d, ctab id %d\n",

  727.                    st->codec->bits_per_sample, st->codec->color_table_id);

  728.             /* figure out the palette situation */

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

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

  731. 

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

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

  734.                 (color_depth == 8)) {

  735.                 if (color_greyscale) {

  736.                     /* compute the greyscale palette */

  737.                     st->codec->bits_per_sample = color_depth;

  738.                     color_count = 1 << color_depth;

  739.                     color_index = 255;

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

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

  742.                         r = g = b = color_index;

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

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

  745.                         color_index -= color_dec;

  746.                         if (color_index < 0)

  747.                             color_index = 0;

  748.                     }

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

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

  751.                     color_count = 1 << color_depth;

  752.                     if (color_depth == 2)

  753.                         color_table = ff_qt_default_palette_4;

  754.                     else if (color_depth == 4)

  755.                         color_table = ff_qt_default_palette_16;

  756.                     else

  757.                         color_table = ff_qt_default_palette_256;

  758. 

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

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

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

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

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

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

  765.                     }

  766.                 } else {

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

  768.                     color_start = get_be32(pb);

  769.                     color_count = get_be16(pb);

  770.                     color_end = get_be16(pb);

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

  772.                         (color_end <= 255)) {

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

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

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

  776.                              * up front */

  777.                             get_byte(pb);

  778.                             get_byte(pb);

  779.                             r = get_byte(pb);

  780.                             get_byte(pb);

  781.                             g = get_byte(pb);

  782.                             get_byte(pb);

  783.                             b = get_byte(pb);

  784.                             get_byte(pb);

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

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

  787.                         }

  788.                     }

  789.                 }

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

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

  792.             } else

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

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

  795.             int bits_per_sample;

  796.             uint16_t version = get_be16(pb);

  797. 

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

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

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

  801. 

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

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

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

  805. 

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

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

  808. 

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

  810. 

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

  812.             case CODEC_ID_PCM_S8:

  813.             case CODEC_ID_PCM_U8:

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

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

  816.                 break;

  817.             case CODEC_ID_PCM_S16LE:

  818.             case CODEC_ID_PCM_S16BE:

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

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

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

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

  823.                 break;

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

  825.             case CODEC_ID_MACE3:

  826.                 sc->samples_per_frame = 6;

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

  828.                 break;

  829.             case CODEC_ID_MACE6:

  830.                 sc->samples_per_frame = 6;

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

  832.                 break;

  833.             case CODEC_ID_ADPCM_IMA_QT:

  834.                 sc->samples_per_frame = 64;

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

  836.                 break;

  837.             default:

  838.                 break;

  839.             }

  840. 

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

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

  843.             if(!c->isom) {

  844.                 if(version==1) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  858.                 }

  859.             }

  860. 

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

  862.             if (bits_per_sample) {

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

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

  865.             }

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

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

  868.         } else {

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

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

  871.         }

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

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

  874.         if (a.size > 8) {

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

  876.                 return -1;

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

  878.             url_fskip(pb, a.size);

  879.     }

  880. 

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

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

  883. 

  884.     /* special codec parameters handling */

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

  886. #ifdef CONFIG_DV_DEMUXER

  887.     case CODEC_ID_DVAUDIO:

  888.         c->dv_fctx = av_alloc_format_context();

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

  890.         if (!c->dv_demux) {

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

  892.             return -1;

  893.         }

  894.         sc->dv_audio_container = 1;

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

  896.         break;

  897. #endif

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

  899.     case CODEC_ID_AMR_WB:

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

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

  902.         break;

  903.     case CODEC_ID_AMR_NB:

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

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

  906.         break;

  907.     case CODEC_ID_MP2:

  908.     case CODEC_ID_MP3:

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

  910.         st->need_parsing = AVSTREAM_PARSE_FULL;

  911.         break;

  912.     case CODEC_ID_ADPCM_MS:

  913.     case CODEC_ID_ADPCM_IMA_WAV:

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

  915.         break;

  916.     default:

  917.         break;

  918.     }

  919. 

  920.     return 0;

  921. }

  922. 

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

  924. {

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

  926.     MOVStreamContext *sc = st->priv_data;

  927.     unsigned int i, entries;

  928. 

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

  930.     get_be24(pb); /* flags */

  931. 

  932.     entries = get_be32(pb);

  933. 

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

  935.         return -1;

  936. 

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

  938. 

  939.     sc->sample_to_chunk_sz = entries;

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

  941.     if (!sc->sample_to_chunk)

  942.         return -1;

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

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

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

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

  947.     }

  948.     return 0;

  949. }

  950. 

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

  952. {

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

  954.     MOVStreamContext *sc = st->priv_data;

  955.     unsigned int i, entries;

  956. 

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

  958.     get_be24(pb); /* flags */

  959. 

  960.     entries = get_be32(pb);

  961. 

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

  963.         return -1;

  964. 

  965.     sc->keyframe_count = entries;

  966. 

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

  968. 

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

  970.     if (!sc->keyframes)

  971.         return -1;

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

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

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

  975.     }

  976.     return 0;

  977. }

  978. 

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

  980. {

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

  982.     MOVStreamContext *sc = st->priv_data;

  983.     unsigned int i, entries, sample_size;

  984. 

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

  986.     get_be24(pb); /* flags */

  987. 

  988.     sample_size = get_be32(pb);

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

  990.         sc->sample_size = sample_size;

  991.     entries = get_be32(pb);

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

  993.         return -1;

  994. 

  995.     sc->sample_count = entries;

  996.     if (sample_size)

  997.         return 0;

  998. 

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

  1000. 

  1001.     sc->sample_sizes = av_malloc(entries * sizeof(int));

  1002.     if (!sc->sample_sizes)

  1003.         return -1;

  1004.     for(i=0; i<entries; i++) {

  1005.         sc->sample_sizes[i] = get_be32(pb);

  1006.         dprintf(c->fc, "sample_sizes[]=%d\n", sc->sample_sizes[i]);

  1007.     }

  1008.     return 0;

  1009. }

  1010. 

  1011. static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1012. {

  1013.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1014.     MOVStreamContext *sc = st->priv_data;

  1015.     unsigned int i, entries;

  1016.     int64_t duration=0;

  1017.     int64_t total_sample_count=0;

  1018. 

  1019.     get_byte(pb); /* version */

  1020.     get_be24(pb); /* flags */

  1021.     entries = get_be32(pb);

  1022.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  1023.         return -1;

  1024. 

  1025.     sc->stts_count = entries;

  1026.     sc->stts_data = av_malloc(entries * sizeof(MOV_stts_t));

  1027.     if (!sc->stts_data)

  1028.         return -1;

  1029.     dprintf(c->fc, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);

  1030. 

  1031.     sc->time_rate=0;

  1032. 

  1033.     for(i=0; i<entries; i++) {

  1034.         int sample_duration;

  1035.         int sample_count;

  1036. 

  1037.         sample_count=get_be32(pb);

  1038.         sample_duration = get_be32(pb);

  1039.         sc->stts_data[i].count= sample_count;

  1040.         sc->stts_data[i].duration= sample_duration;

  1041. 

  1042.         sc->time_rate= ff_gcd(sc->time_rate, sample_duration);

  1043. 

  1044.         dprintf(c->fc, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);

  1045. 

  1046.         duration+=(int64_t)sample_duration*sample_count;

  1047.         total_sample_count+=sample_count;

  1048.     }

  1049. 

  1050.     st->nb_frames= total_sample_count;

  1051.     if(duration)

  1052.         st->duration= duration;

  1053.     return 0;

  1054. }

  1055. 

  1056. static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1057. {

  1058.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1059.     MOVStreamContext *sc = st->priv_data;

  1060.     unsigned int i, entries;

  1061. 

  1062.     get_byte(pb); /* version */

  1063.     get_be24(pb); /* flags */

  1064.     entries = get_be32(pb);

  1065.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  1066.         return -1;

  1067. 

  1068.     sc->ctts_count = entries;

  1069.     sc->ctts_data = av_malloc(entries * sizeof(MOV_stts_t));

  1070.     if (!sc->ctts_data)

  1071.         return -1;

  1072.     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1073. 

  1074.     for(i=0; i<entries; i++) {

  1075.         int count    =get_be32(pb);

  1076.         int duration =get_be32(pb);

  1077. 

  1078.         if (duration < 0) {

  1079.             av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");

  1080.             sc->ctts_count = 0;

  1081.             url_fskip(pb, 8 * (entries - i - 1));

  1082.             break;

  1083.         }

  1084.         sc->ctts_data[i].count   = count;

  1085.         sc->ctts_data[i].duration= duration;

  1086. 

  1087.         sc->time_rate= ff_gcd(sc->time_rate, duration);

  1088.     }

  1089.     return 0;

  1090. }

  1091. 

  1092. static void mov_build_index(MOVContext *mov, AVStream *st);

  1093. 

  1094. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1095. {

  1096.     AVStream *st;

  1097.     MOVStreamContext *sc;

  1098.     int ret;

  1099. 

  1100.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1101.     if (!st) return -2;

  1102.     sc = av_mallocz(sizeof(MOVStreamContext));

  1103.     if (!sc) {

  1104.         av_free(st);

  1105.         return -1;

  1106.     }

  1107. 

  1108.     st->priv_data = sc;

  1109.     st->codec->codec_type = CODEC_TYPE_DATA;

  1110.     st->start_time = 0; /* XXX: check */

  1111. 

  1112.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  1113.         return ret;

  1114. 

  1115.     /* sanity checks */

  1116.     if(!sc->stts_count || !sc->chunk_count || !sc->sample_to_chunk_sz ||

  1117.        (!sc->sample_size && !sc->sample_count)){

  1118.         av_log(c->fc, AV_LOG_ERROR, "missing mandatory atoms, broken header\n");

  1119.         sc->sample_count = 0; //ignore track

  1120.         return 0;

  1121.     }

  1122.     if(!sc->time_rate)

  1123.         sc->time_rate=1;

  1124.     if(!sc->time_scale)

  1125.         sc->time_scale= c->time_scale;

  1126.     av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);

  1127. 

  1128.     if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)

  1129.         st->codec->frame_size = av_rescale(sc->time_rate, st->codec->sample_rate, sc->time_scale);

  1130. 

  1131.     if(st->duration != AV_NOPTS_VALUE){

  1132.         assert(st->duration % sc->time_rate == 0);

  1133.         st->duration /= sc->time_rate;

  1134.     }

  1135.     sc->ffindex = st->index;

  1136.     mov_build_index(c, st);

  1137. 

  1138.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  1139.         if (url_fopen(&sc->pb, sc->drefs[sc->dref_id-1].path, URL_RDONLY) < 0)

  1140.             av_log(c->fc, AV_LOG_ERROR, "stream %d, error opening external essence: %s\n",

  1141.                    st->index, strerror(errno));

  1142.     } else

  1143.         sc->pb = c->fc->pb;

  1144. 

  1145.     switch (st->codec->codec_id) {

  1146. #ifdef CONFIG_H261_DECODER

  1147.     case CODEC_ID_H261:

  1148. #endif

  1149. #ifdef CONFIG_H263_DECODER

  1150.     case CODEC_ID_H263:

  1151. #endif

  1152. #ifdef CONFIG_MPEG4_DECODER

  1153.     case CODEC_ID_MPEG4:

  1154. #endif

  1155.         st->codec->width= 0; /* let decoder init width/height */

  1156.         st->codec->height= 0;

  1157.         break;

  1158. #ifdef CONFIG_LIBFAAD

  1159.     case CODEC_ID_AAC:

  1160. #endif

  1161. #ifdef CONFIG_VORBIS_DECODER

  1162.     case CODEC_ID_VORBIS:

  1163. #endif

  1164.     case CODEC_ID_MP3ON4:

  1165.         st->codec->sample_rate= 0; /* let decoder init parameters properly */

  1166.         break;

  1167.     }

  1168.     return 0;

  1169. }

  1170. 

  1171. static void mov_parse_udta_string(ByteIOContext *pb, char *str, int size)

  1172. {

  1173.     uint16_t str_size = get_be16(pb); /* string length */;

  1174. 

  1175.     get_be16(pb); /* skip language */

  1176.     get_buffer(pb, str, FFMIN(size, str_size));

  1177. }

  1178. 

  1179. static int mov_read_udta(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1180. {

  1181.     uint64_t end = url_ftell(pb) + atom.size;

  1182. 

  1183.     while (url_ftell(pb) + 8 < end) {

  1184.         uint32_t tag_size = get_be32(pb);

  1185.         uint32_t tag      = get_le32(pb);

  1186.         uint64_t next     = url_ftell(pb) + tag_size - 8;

  1187. 

  1188.         if (next > end) // stop if tag_size is wrong

  1189.             break;

  1190. 

  1191.         switch (tag) {

  1192.         case MKTAG(0xa9,'n','a','m'):

  1193.             mov_parse_udta_string(pb, c->fc->title,     sizeof(c->fc->title));

  1194.             break;

  1195.         case MKTAG(0xa9,'w','r','t'):

  1196.             mov_parse_udta_string(pb, c->fc->author,    sizeof(c->fc->author));

  1197.             break;

  1198.         case MKTAG(0xa9,'c','p','y'):

  1199.             mov_parse_udta_string(pb, c->fc->copyright, sizeof(c->fc->copyright));

  1200.             break;

  1201.         case MKTAG(0xa9,'i','n','f'):

  1202.             mov_parse_udta_string(pb, c->fc->comment,   sizeof(c->fc->comment));

  1203.             break;

  1204.         default:

  1205.             break;

  1206.         }

  1207. 

  1208.         url_fseek(pb, next, SEEK_SET);

  1209.     }

  1210. 

  1211.     return 0;

  1212. }

  1213. 

  1214. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1215. {

  1216.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1217.     int version = get_byte(pb);

  1218. 

  1219.     get_be24(pb); /* flags */

  1220.     /*

  1221.     MOV_TRACK_ENABLED 0x0001

  1222.     MOV_TRACK_IN_MOVIE 0x0002

  1223.     MOV_TRACK_IN_PREVIEW 0x0004

  1224.     MOV_TRACK_IN_POSTER 0x0008

  1225.     */

  1226. 

  1227.     if (version == 1) {

  1228.         get_be64(pb);

  1229.         get_be64(pb);

  1230.     } else {

  1231.         get_be32(pb); /* creation time */

  1232.         get_be32(pb); /* modification time */

  1233.     }

  1234.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1235.     get_be32(pb); /* reserved */

  1236.     st->start_time = 0; /* check */

  1237.     (version == 1) ? get_be64(pb) : get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

  1238.     get_be32(pb); /* reserved */

  1239.     get_be32(pb); /* reserved */

  1240. 

  1241.     get_be16(pb); /* layer */

  1242.     get_be16(pb); /* alternate group */

  1243.     get_be16(pb); /* volume */

  1244.     get_be16(pb); /* reserved */

  1245. 

  1246.     url_fskip(pb, 36); /* display matrix */

  1247. 

  1248.     /* those are fixed-point */

  1249.     get_be32(pb); /* track width */

  1250.     get_be32(pb); /* track height */

  1251. 

  1252.     return 0;

  1253. }

  1254. 

  1255. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1256. /* like the files created with Adobe Premiere 5.0, for samples see */

  1257. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1258. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1259. {

  1260.     int err;

  1261. 

  1262.     if (atom.size < 8)

  1263.         return 0; /* continue */

  1264.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1265.         url_fskip(pb, atom.size - 4);

  1266.         return 0;

  1267.     }

  1268.     atom.type = get_le32(pb);

  1269.     atom.offset += 8;

  1270.     atom.size -= 8;

  1271.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1272.         url_fskip(pb, atom.size);

  1273.         return 0;

  1274.     }

  1275.     err = mov_read_mdat(c, pb, atom);

  1276.     return err;

  1277. }

  1278. 

  1279. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1280. {

  1281. #ifdef CONFIG_ZLIB

  1282.     ByteIOContext ctx;

  1283.     uint8_t *cmov_data;

  1284.     uint8_t *moov_data; /* uncompressed data */

  1285.     long cmov_len, moov_len;

  1286.     int ret;

  1287. 

  1288.     get_be32(pb); /* dcom atom */

  1289.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1290.         return -1;

  1291.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1292.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1293.         return -1;

  1294.     }

  1295.     get_be32(pb); /* cmvd atom */

  1296.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1297.         return -1;

  1298.     moov_len = get_be32(pb); /* uncompressed size */

  1299.     cmov_len = atom.size - 6 * 4;

  1300. 

  1301.     cmov_data = av_malloc(cmov_len);

  1302.     if (!cmov_data)

  1303.         return -1;

  1304.     moov_data = av_malloc(moov_len);

  1305.     if (!moov_data) {

  1306.         av_free(cmov_data);

  1307.         return -1;

  1308.     }

  1309.     get_buffer(pb, cmov_data, cmov_len);

  1310.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1311.         return -1;

  1312.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  1313.         return -1;

  1314.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1315.     atom.offset = 0;

  1316.     atom.size = moov_len;

  1317. #ifdef DEBUG

  1318. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1319. #endif

  1320.     ret = mov_read_default(c, &ctx, atom);

  1321.     av_free(moov_data);

  1322.     av_free(cmov_data);

  1323.     return ret;

  1324. #else

  1325.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  1326.     return -1;

  1327. #endif

  1328. }

  1329. 

  1330. /* edit list atom */

  1331. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1332. {

  1333.     MOVStreamContext *sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  1334.     int i, edit_count;

  1335. 

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

  1337.     get_be24(pb); /* flags */

  1338.     edit_count= sc->edit_count = get_be32(pb);     /* entries */

  1339. 

  1340.     for(i=0; i<edit_count; i++){

  1341.         int time;

  1342.         get_be32(pb); /* Track duration */

  1343.         time = get_be32(pb); /* Media time */

  1344.         get_be32(pb); /* Media rate */

  1345.         if (time != 0)

  1346.             av_log(c->fc, AV_LOG_WARNING, "edit list not starting at 0, "

  1347.                    "a/v desync might occur, patch welcome\n");

  1348.     }

  1349.     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, sc->edit_count);

  1350.     return 0;

  1351. }

  1352. 

  1353. static const MOVParseTableEntry mov_default_parse_table[] = {

  1354. /* mp4 atoms */

  1355. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1356. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1357. { MKTAG( 'd', 'i', 'n', 'f' ), mov_read_default },

  1358. { MKTAG( 'd', 'r', 'e', 'f' ), mov_read_dref },

  1359. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1360. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1361. { MKTAG( 'e', 'n', 'd', 'a' ), mov_read_enda },

  1362. { MKTAG( 'f', 'i', 'e', 'l' ), mov_read_extradata },

  1363. { MKTAG( 'f', 't', 'y', 'p' ), mov_read_ftyp },

  1364. { MKTAG( 'g', 'l', 'b', 'l' ), mov_read_glbl },

  1365. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1366. { MKTAG( 'j', 'p', '2', 'h' ), mov_read_extradata },

  1367. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1368. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1369. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1370. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1371. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1372. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1373. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1374. { MKTAG( 'a', 'l', 'a', 'c' ), mov_read_extradata }, /* alac specific atom */

  1375. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_glbl },

  1376. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1377. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1378. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1379. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1380. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1381. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1382. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1383. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1384. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1385. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_udta },

  1386. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1387. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1388. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1389. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1390. { 0, NULL }

  1391. };

  1392. 

  1393. /* XXX: is it sufficient ? */

  1394. static int mov_probe(AVProbeData *p)

  1395. {

  1396.     unsigned int offset;

  1397.     uint32_t tag;

  1398.     int score = 0;

  1399. 

  1400.     /* check file header */

  1401.     offset = 0;

  1402.     for(;;) {

  1403.         /* ignore invalid offset */

  1404.         if ((offset + 8) > (unsigned int)p->buf_size)

  1405.             return score;

  1406.         tag = AV_RL32(p->buf + offset + 4);

  1407.         switch(tag) {

  1408.         /* check for obvious tags */

  1409.         case MKTAG( 'j', 'P', ' ', ' ' ): /* jpeg 2000 signature */

  1410.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1411.         case MKTAG( 'm', 'd', 'a', 't' ):

  1412.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1413.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1414.             return AVPROBE_SCORE_MAX;

  1415.         /* those are more common words, so rate then a bit less */

  1416.         case MKTAG( 'e', 'd', 'i', 'w' ): /* xdcam files have reverted first tags */

  1417.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1418.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1419.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1420.         case MKTAG( 'p', 'i', 'c', 't' ):

  1421.             return AVPROBE_SCORE_MAX - 5;

  1422.         case MKTAG(0x82,0x82,0x7f,0x7d ):

  1423.         case MKTAG( 'f', 't', 'y', 'p' ):

  1424.         case MKTAG( 's', 'k', 'i', 'p' ):

  1425.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1426.             offset = AV_RB32(p->buf+offset) + offset;

  1427.             /* if we only find those cause probedata is too small at least rate them */

  1428.             score = AVPROBE_SCORE_MAX - 50;

  1429.             break;

  1430.         default:

  1431.             /* unrecognized tag */

  1432.             return score;

  1433.         }

  1434.     }

  1435.     return score;

  1436. }

  1437. 

  1438. static void mov_build_index(MOVContext *mov, AVStream *st)

  1439. {

  1440.     MOVStreamContext *sc = st->priv_data;

  1441.     offset_t current_offset;

  1442.     int64_t current_dts = 0;

  1443.     unsigned int stts_index = 0;

  1444.     unsigned int stsc_index = 0;

  1445.     unsigned int stss_index = 0;

  1446.     unsigned int i, j;

  1447. 

  1448.     if (sc->sample_sizes || st->codec->codec_type == CODEC_TYPE_VIDEO ||

  1449.         sc->audio_cid == -2) {

  1450.         unsigned int current_sample = 0;

  1451.         unsigned int stts_sample = 0;

  1452.         unsigned int keyframe, sample_size;

  1453.         unsigned int distance = 0;

  1454.         int key_off = sc->keyframes && sc->keyframes[0] == 1;

  1455. 

  1456.         st->nb_frames = sc->sample_count;

  1457.         for (i = 0; i < sc->chunk_count; i++) {

  1458.             current_offset = sc->chunk_offsets[i];

  1459.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1460.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1461.                 stsc_index++;

  1462.             for (j = 0; j < sc->sample_to_chunk[stsc_index].count; j++) {

  1463.                 if (current_sample >= sc->sample_count) {

  1464.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1465.                     goto out;

  1466.                 }

  1467.                 keyframe = !sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index];

  1468.                 if (keyframe) {

  1469.                     distance = 0;

  1470.                     if (stss_index + 1 < sc->keyframe_count)

  1471.                         stss_index++;

  1472.                 }

  1473.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1474.                 dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1475.                         "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1476.                         current_offset, current_dts, sample_size, distance, keyframe);

  1477.                 if(sc->sample_to_chunk[stsc_index].id - 1 == sc->pseudo_stream_id)

  1478.                     av_add_index_entry(st, current_offset, current_dts, sample_size, distance,

  1479.                                     keyframe ? AVINDEX_KEYFRAME : 0);

  1480.                 current_offset += sample_size;

  1481.                 assert(sc->stts_data[stts_index].duration % sc->time_rate == 0);

  1482.                 current_dts += sc->stts_data[stts_index].duration / sc->time_rate;

  1483.                 distance++;

  1484.                 stts_sample++;

  1485.                 current_sample++;

  1486.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1487.                     stts_sample = 0;

  1488.                     stts_index++;

  1489.                 }

  1490.             }

  1491.         }

  1492.     } else { /* read whole chunk */

  1493.         unsigned int chunk_samples, chunk_size, chunk_duration;

  1494.         unsigned int frames = 1;

  1495.         for (i = 0; i < sc->chunk_count; i++) {

  1496.             current_offset = sc->chunk_offsets[i];

  1497.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1498.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1499.                 stsc_index++;

  1500.             chunk_samples = sc->sample_to_chunk[stsc_index].count;

  1501.             /* get chunk size, beware of alaw/ulaw/mace */

  1502.             if (sc->samples_per_frame > 0 &&

  1503.                 (chunk_samples * sc->bytes_per_frame % sc->samples_per_frame == 0)) {

  1504.                 if (sc->samples_per_frame < 1024)

  1505.                     chunk_size = chunk_samples * sc->bytes_per_frame / sc->samples_per_frame;

  1506.                 else {

  1507.                     chunk_size = sc->bytes_per_frame;

  1508.                     frames = chunk_samples / sc->samples_per_frame;

  1509.                     chunk_samples = sc->samples_per_frame;

  1510.                 }

  1511.             } else if (sc->sample_size > 1 || st->codec->bits_per_sample == 8) {

  1512.                 chunk_size = chunk_samples * sc->sample_size;

  1513.             } else {

  1514.                 av_log(mov->fc, AV_LOG_ERROR, "could not determine chunk size, report problem\n");

  1515.                 goto out;

  1516.             }

  1517.             for (j = 0; j < frames; j++) {

  1518.                 av_add_index_entry(st, current_offset, current_dts, chunk_size, 0, AVINDEX_KEYFRAME);

  1519.                 /* get chunk duration */

  1520.                 chunk_duration = 0;

  1521.                 while (chunk_samples > 0) {

  1522.                     if (chunk_samples < sc->stts_data[stts_index].count) {

  1523.                         chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1524.                         sc->stts_data[stts_index].count -= chunk_samples;

  1525.                         break;

  1526.                     } else {

  1527.                         chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1528.                         chunk_samples -= sc->stts_data[stts_index].count;

  1529.                         if (stts_index + 1 < sc->stts_count)

  1530.                             stts_index++;

  1531.                     }

  1532.                 }

  1533.                 current_offset += sc->bytes_per_frame;

  1534.                 dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", size %d, "

  1535.                         "duration %d\n", st->index, i, current_offset, current_dts, chunk_size, chunk_duration);

  1536.                 assert(chunk_duration % sc->time_rate == 0);

  1537.                 current_dts += chunk_duration / sc->time_rate;

  1538.             }

  1539.         }

  1540.     }

  1541.  out:

  1542.     /* adjust sample count to avindex entries */

  1543.     sc->sample_count = st->nb_index_entries;

  1544. }

  1545. 

  1546. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1547. {

  1548.     MOVContext *mov = s->priv_data;

  1549.     ByteIOContext *pb = s->pb;

  1550.     int i, err;

  1551.     MOV_atom_t atom = { 0, 0, 0 };

  1552. 

  1553.     mov->fc = s;

  1554. 

  1555.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1556.         atom.size = url_fsize(pb);

  1557.     else

  1558.         atom.size = INT64_MAX;

  1559. 

  1560.     /* check MOV header */

  1561.     err = mov_read_default(mov, pb, atom);

  1562.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1563.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1564.                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1565.         return -1;

  1566.     }

  1567.     dprintf(mov->fc, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1568. 

  1569.     for(i=0; i<s->nb_streams; i++) {

  1570.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1571.         /* Do not need those anymore. */

  1572.         av_freep(&sc->chunk_offsets);

  1573.         av_freep(&sc->sample_to_chunk);

  1574.         av_freep(&sc->sample_sizes);

  1575.         av_freep(&sc->keyframes);

  1576.         av_freep(&sc->stts_data);

  1577.     }

  1578.     return 0;

  1579. }

  1580. 

  1581. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1582. {

  1583.     MOVContext *mov = s->priv_data;

  1584.     MOVStreamContext *sc = 0;

  1585.     AVIndexEntry *sample = 0;

  1586.     int64_t best_dts = INT64_MAX;

  1587.     int i;

  1588. 

  1589.     for (i = 0; i < s->nb_streams; i++) {

  1590.         AVStream *st = s->streams[i];

  1591.         MOVStreamContext *msc = st->priv_data;

  1592.         if (st->discard != AVDISCARD_ALL && msc->pb && msc->current_sample < msc->sample_count) {

  1593.             AVIndexEntry *current_sample = &st->index_entries[msc->current_sample];

  1594.             int64_t dts = av_rescale(current_sample->timestamp * (int64_t)msc->time_rate,

  1595.                                      AV_TIME_BASE, msc->time_scale);

  1596.             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  1597.             if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||

  1598.                 (!url_is_streamed(s->pb) &&

  1599.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  1600.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  1601.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  1602.                 sample = current_sample;

  1603.                 best_dts = dts;

  1604.                 sc = msc;

  1605.             }

  1606.         }

  1607.     }

  1608.     if (!sample)

  1609.         return -1;

  1610.     /* must be done just before reading, to avoid infinite loop on sample */

  1611.     sc->current_sample++;

  1612.     if (url_fseek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  1613.         av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  1614.                sc->ffindex, sample->pos);

  1615.         return -1;

  1616.     }

  1617.     av_get_packet(sc->pb, pkt, sample->size);

  1618. #ifdef CONFIG_DV_DEMUXER

  1619.     if (mov->dv_demux && sc->dv_audio_container) {

  1620.         dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  1621.         av_free(pkt->data);

  1622.         pkt->size = 0;

  1623.         if (dv_get_packet(mov->dv_demux, pkt) < 0)

  1624.             return -1;

  1625.     }

  1626. #endif

  1627.     pkt->stream_index = sc->ffindex;

  1628.     pkt->dts = sample->timestamp;

  1629.     if (sc->ctts_data) {

  1630.         assert(sc->ctts_data[sc->sample_to_ctime_index].duration % sc->time_rate == 0);

  1631.         pkt->pts = pkt->dts + sc->ctts_data[sc->sample_to_ctime_index].duration / sc->time_rate;

  1632.         /* update ctts context */

  1633.         sc->sample_to_ctime_sample++;

  1634.         if (sc->sample_to_ctime_index < sc->ctts_count &&

  1635.             sc->ctts_data[sc->sample_to_ctime_index].count == sc->sample_to_ctime_sample) {

  1636.             sc->sample_to_ctime_index++;

  1637.             sc->sample_to_ctime_sample = 0;

  1638.         }

  1639.     } else {

  1640.         pkt->pts = pkt->dts;

  1641.     }

  1642.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? PKT_FLAG_KEY : 0;

  1643.     pkt->pos = sample->pos;

  1644.     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  1645.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  1646.     return 0;

  1647. }

  1648. 

  1649. static int mov_seek_stream(AVStream *st, int64_t timestamp, int flags)

  1650. {

  1651.     MOVStreamContext *sc = st->priv_data;

  1652.     int sample, time_sample;

  1653.     int i;

  1654. 

  1655.     sample = av_index_search_timestamp(st, timestamp, flags);

  1656.     dprintf(st->codec, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  1657.     if (sample < 0) /* not sure what to do */

  1658.         return -1;

  1659.     sc->current_sample = sample;

  1660.     dprintf(st->codec, "stream %d, found sample %d\n", st->index, sc->current_sample);

  1661.     /* adjust ctts index */

  1662.     if (sc->ctts_data) {

  1663.         time_sample = 0;

  1664.         for (i = 0; i < sc->ctts_count; i++) {

  1665.             int next = time_sample + sc->ctts_data[i].count;

  1666.             if (next > sc->current_sample) {

  1667.                 sc->sample_to_ctime_index = i;

  1668.                 sc->sample_to_ctime_sample = sc->current_sample - time_sample;

  1669.                 break;

  1670.             }

  1671.             time_sample = next;

  1672.         }

  1673.     }

  1674.     return sample;

  1675. }

  1676. 

  1677. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1678. {

  1679.     AVStream *st;

  1680.     int64_t seek_timestamp, timestamp;

  1681.     int sample;

  1682.     int i;

  1683. 

  1684.     if (stream_index >= s->nb_streams)

  1685.         return -1;

  1686. 

  1687.     st = s->streams[stream_index];

  1688.     sample = mov_seek_stream(st, sample_time, flags);

  1689.     if (sample < 0)

  1690.         return -1;

  1691. 

  1692.     /* adjust seek timestamp to found sample timestamp */

  1693.     seek_timestamp = st->index_entries[sample].timestamp;

  1694. 

  1695.     for (i = 0; i < s->nb_streams; i++) {

  1696.         st = s->streams[i];

  1697.         if (stream_index == i || st->discard == AVDISCARD_ALL)

  1698.             continue;

  1699. 

  1700.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  1701.         mov_seek_stream(st, timestamp, flags);

  1702.     }

  1703.     return 0;

  1704. }

  1705. 

  1706. static int mov_read_close(AVFormatContext *s)

  1707. {

  1708.     int i, j;

  1709.     MOVContext *mov = s->priv_data;

  1710.     for(i=0; i<s->nb_streams; i++) {

  1711.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1712.         av_freep(&sc->ctts_data);

  1713.         for (j=0; j<sc->drefs_count; j++)

  1714.             av_freep(&sc->drefs[j].path);

  1715.         av_freep(&sc->drefs);

  1716.         if (sc->pb && sc->pb != s->pb)

  1717.             url_fclose(sc->pb);

  1718.     }

  1719.     if(mov->dv_demux){

  1720.         for(i=0; i<mov->dv_fctx->nb_streams; i++){

  1721.             av_freep(&mov->dv_fctx->streams[i]->codec);

  1722.             av_freep(&mov->dv_fctx->streams[i]);

  1723.         }

  1724.         av_freep(&mov->dv_fctx);

  1725.         av_freep(&mov->dv_demux);

  1726.     }

  1727.     return 0;

  1728. }

  1729. 

  1730. AVInputFormat mov_demuxer = {

  1731.     "mov,mp4,m4a,3gp,3g2,mj2",

  1732.     "QuickTime/MPEG4/Motion JPEG 2000 format",

  1733.     sizeof(MOVContext),

  1734.     mov_probe,

  1735.     mov_read_header,

  1736.     mov_read_packet,

  1737.     mov_read_close,

  1738.     mov_read_seek,

  1739. };