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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.  <0: 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 (url_is_streamed(pb) && 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.     return 0; /* now go for moov */

  394. }

  395. 

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

  397. {

  398.     uint32_t type = get_le32(pb);

  399. 

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

  401.         c->isom = 1;

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

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

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

  405.     return 0;

  406. }

  407. 

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

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

  410. {

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

  412.         return -1;

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

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

  415.     c->found_moov=1;

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

  417. }

  418. 

  419. 

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

  421. {

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

  423.     MOVStreamContext *sc = st->priv_data;

  424.     int version = get_byte(pb);

  425.     int lang;

  426. 

  427.     if (version > 1)

  428.         return 1; /* unsupported */

  429. 

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

  431.     if (version == 1) {

  432.         get_be64(pb);

  433.         get_be64(pb);

  434.     } else {

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

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

  437.     }

  438. 

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

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

  441. 

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

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

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

  445. 

  446.     return 0;

  447. }

  448. 

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

  450. {

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

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

  453. 

  454.     if (version == 1) {

  455.         get_be64(pb);

  456.         get_be64(pb);

  457.     } else {

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

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

  460.     }

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

  462. 

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

  464. 

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

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

  467. 

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

  469. 

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

  471. 

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

  473. 

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

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

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

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

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

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

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

  481. 

  482.     return 0;

  483. }

  484. 

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

  486. {

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

  488. 

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

  490.         return -1;

  491. 

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

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

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

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

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

  497.         return AVERROR(ENOMEM);

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

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

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

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

  502.     return 0;

  503. }

  504. 

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

  506. {

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

  508.     int little_endian = get_be16(pb);

  509. 

  510.     if (little_endian) {

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

  512.         case CODEC_ID_PCM_S24BE:

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

  514.             break;

  515.         case CODEC_ID_PCM_S32BE:

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

  517.             break;

  518.         default:

  519.             break;

  520.         }

  521.     }

  522.     return 0;

  523. }

  524. 

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

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

  527. {

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

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

  530.     uint8_t *buf;

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

  532.         return -1;

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

  534.     if(!buf)

  535.         return -1;

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

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

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

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

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

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

  542.     return 0;

  543. }

  544. 

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

  546. {

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

  548. 

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

  550.         return -1;

  551. 

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

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

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

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

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

  557.             return AVERROR(ENOMEM);

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

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

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

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

  562.             return -1;

  563.     } else

  564.         url_fskip(pb, atom.size);

  565.     return 0;

  566. }

  567. 

  568. /**

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

  570.  * nor size unlike mov_read_extradata.

  571.  */

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

  573. {

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

  575. 

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

  577.         return -1;

  578. 

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

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

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

  582.         return AVERROR(ENOMEM);

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

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

  585.     return 0;

  586. }

  587. 

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

  589. {

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

  591.     MOVStreamContext *sc = st->priv_data;

  592.     unsigned int i, entries;

  593. 

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

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

  596. 

  597.     entries = get_be32(pb);

  598. 

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

  600.         return -1;

  601. 

  602.     sc->chunk_count = entries;

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

  604.     if (!sc->chunk_offsets)

  605.         return -1;

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

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

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

  609.         }

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

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

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

  613.         }

  614.     } else

  615.         return -1;

  616. 

  617.     return 0;

  618. }

  619. 

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

  621. {

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

  623.     MOVStreamContext *sc = st->priv_data;

  624.     int entries, frames_per_sample;

  625.     uint32_t format;

  626.     uint8_t codec_name[32];

  627. 

  628.     /* for palette traversal */

  629.     unsigned int color_depth;

  630.     unsigned int color_start;

  631.     unsigned int color_count;

  632.     unsigned int color_end;

  633.     int color_index;

  634.     int color_dec;

  635.     int color_greyscale;

  636.     const uint8_t *color_table;

  637.     int j, pseudo_stream_id;

  638.     unsigned char r, g, b;

  639. 

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

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

  642. 

  643.     entries = get_be32(pb);

  644. 

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

  646.         enum CodecID id;

  647.         int dref_id;

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

  649.         offset_t start_pos = url_ftell(pb);

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

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

  652. 

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

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

  655.         dref_id = get_be16(pb);

  656. 

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

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

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

  660.            ){

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

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

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

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

  665.             continue;

  666.         }

  667.         sc->pseudo_stream_id= pseudo_stream_id;

  668.         sc->dref_id= dref_id;

  669. 

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

  671.         id = codec_get_id(codec_movaudio_tags, format);

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

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

  674. 

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

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

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

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

  679.             id = codec_get_id(codec_movvideo_tags, format);

  680.             if (id <= 0)

  681.                 id = codec_get_id(codec_bmp_tags, format);

  682.             if (id > 0)

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

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

  685.                 id = codec_get_id(ff_codec_movsubtitle_tags, format);

  686.                 if(id > 0)

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

  688.             }

  689.         }

  690. 

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

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

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

  694. 

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

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

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

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

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

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

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

  702. 

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

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

  705. 

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

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

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

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

  710. 

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

  712. 

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

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

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

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

  717.             }

  718. 

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

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

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

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

  723.             /* figure out the palette situation */

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

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

  726. 

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

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

  729.                 (color_depth == 8)) {

  730.                 if (color_greyscale) {

  731.                     /* compute the greyscale palette */

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

  733.                     color_count = 1 << color_depth;

  734.                     color_index = 255;

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

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

  737.                         r = g = b = color_index;

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

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

  740.                         color_index -= color_dec;

  741.                         if (color_index < 0)

  742.                             color_index = 0;

  743.                     }

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

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

  746.                     color_count = 1 << color_depth;

  747.                     if (color_depth == 2)

  748.                         color_table = ff_qt_default_palette_4;

  749.                     else if (color_depth == 4)

  750.                         color_table = ff_qt_default_palette_16;

  751.                     else

  752.                         color_table = ff_qt_default_palette_256;

  753. 

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

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

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

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

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

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

  760.                     }

  761.                 } else {

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

  763.                     color_start = get_be32(pb);

  764.                     color_count = get_be16(pb);

  765.                     color_end = get_be16(pb);

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

  767.                         (color_end <= 255)) {

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

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

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

  771.                              * up front */

  772.                             get_byte(pb);

  773.                             get_byte(pb);

  774.                             r = get_byte(pb);

  775.                             get_byte(pb);

  776.                             g = get_byte(pb);

  777.                             get_byte(pb);

  778.                             b = get_byte(pb);

  779.                             get_byte(pb);

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

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

  782.                         }

  783.                     }

  784.                 }

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

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

  787.             } else

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

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

  790.             int bits_per_sample;

  791.             uint16_t version = get_be16(pb);

  792. 

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

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

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

  796. 

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

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

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

  800. 

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

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

  803. 

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

  805. 

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

  807.             case CODEC_ID_PCM_S8:

  808.             case CODEC_ID_PCM_U8:

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

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

  811.                 break;

  812.             case CODEC_ID_PCM_S16LE:

  813.             case CODEC_ID_PCM_S16BE:

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

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

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

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

  818.                 break;

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

  820.             case CODEC_ID_MACE3:

  821.                 sc->samples_per_frame = 6;

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

  823.                 break;

  824.             case CODEC_ID_MACE6:

  825.                 sc->samples_per_frame = 6;

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

  827.                 break;

  828.             case CODEC_ID_ADPCM_IMA_QT:

  829.                 sc->samples_per_frame = 64;

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

  831.                 break;

  832.             default:

  833.                 break;

  834.             }

  835. 

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

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

  838.             if(!c->isom) {

  839.                 if(version==1) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  853.                 }

  854.             }

  855. 

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

  857.             if (bits_per_sample) {

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

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

  860.             }

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

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

  863.         } else {

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

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

  866.         }

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

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

  869.         if (a.size > 8) {

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

  871.                 return -1;

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

  873.             url_fskip(pb, a.size);

  874.     }

  875. 

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

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

  878. 

  879.     /* special codec parameters handling */

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

  881. #ifdef CONFIG_DV_DEMUXER

  882.     case CODEC_ID_DVAUDIO:

  883.         c->dv_fctx = av_alloc_format_context();

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

  885.         if (!c->dv_demux) {

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

  887.             return -1;

  888.         }

  889.         sc->dv_audio_container = 1;

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

  891.         break;

  892. #endif

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

  894.     case CODEC_ID_AMR_WB:

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

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

  897.         break;

  898.     case CODEC_ID_AMR_NB:

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

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

  901.         break;

  902.     case CODEC_ID_MP2:

  903.     case CODEC_ID_MP3:

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

  905.         st->need_parsing = AVSTREAM_PARSE_FULL;

  906.         break;

  907.     case CODEC_ID_ADPCM_MS:

  908.     case CODEC_ID_ADPCM_IMA_WAV:

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

  910.         break;

  911.     default:

  912.         break;

  913.     }

  914. 

  915.     return 0;

  916. }

  917. 

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

  919. {

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

  921.     MOVStreamContext *sc = st->priv_data;

  922.     unsigned int i, entries;

  923. 

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

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

  926. 

  927.     entries = get_be32(pb);

  928. 

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

  930.         return -1;

  931. 

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

  933. 

  934.     sc->sample_to_chunk_sz = entries;

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

  936.     if (!sc->sample_to_chunk)

  937.         return -1;

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

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

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

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

  942.     }

  943.     return 0;

  944. }

  945. 

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

  947. {

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

  949.     MOVStreamContext *sc = st->priv_data;

  950.     unsigned int i, entries;

  951. 

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

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

  954. 

  955.     entries = get_be32(pb);

  956. 

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

  958.         return -1;

  959. 

  960.     sc->keyframe_count = entries;

  961. 

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

  963. 

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

  965.     if (!sc->keyframes)

  966.         return -1;

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

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

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

  970.     }

  971.     return 0;

  972. }

  973. 

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

  975. {

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

  977.     MOVStreamContext *sc = st->priv_data;

  978.     unsigned int i, entries, sample_size;

  979. 

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

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

  982. 

  983.     sample_size = get_be32(pb);

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

  985.         sc->sample_size = sample_size;

  986.     entries = get_be32(pb);

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

  988.         return -1;

  989. 

  990.     sc->sample_count = entries;

  991.     if (sample_size)

  992.         return 0;

  993. 

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

  995. 

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

  997.     if (!sc->sample_sizes)

  998.         return -1;

  999.     for(i=0; i<entries; i++)

  1000.         sc->sample_sizes[i] = get_be32(pb);

  1001.     return 0;

  1002. }

  1003. 

  1004. static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1005. {

  1006.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1007.     MOVStreamContext *sc = st->priv_data;

  1008.     unsigned int i, entries;

  1009.     int64_t duration=0;

  1010.     int64_t total_sample_count=0;

  1011. 

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

  1013.     get_be24(pb); /* flags */

  1014.     entries = get_be32(pb);

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

  1016.         return -1;

  1017. 

  1018.     sc->stts_count = entries;

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

  1020.     if (!sc->stts_data)

  1021.         return -1;

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

  1023. 

  1024.     sc->time_rate=0;

  1025. 

  1026.     for(i=0; i<entries; i++) {

  1027.         int sample_duration;

  1028.         int sample_count;

  1029. 

  1030.         sample_count=get_be32(pb);

  1031.         sample_duration = get_be32(pb);

  1032.         sc->stts_data[i].count= sample_count;

  1033.         sc->stts_data[i].duration= sample_duration;

  1034. 

  1035.         sc->time_rate= ff_gcd(sc->time_rate, sample_duration);

  1036. 

  1037.         dprintf(c->fc, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);

  1038. 

  1039.         duration+=(int64_t)sample_duration*sample_count;

  1040.         total_sample_count+=sample_count;

  1041.     }

  1042. 

  1043.     st->nb_frames= total_sample_count;

  1044.     if(duration)

  1045.         st->duration= duration;

  1046.     return 0;

  1047. }

  1048. 

  1049. static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1050. {

  1051.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1052.     MOVStreamContext *sc = st->priv_data;

  1053.     unsigned int i, entries;

  1054. 

  1055.     get_byte(pb); /* version */

  1056.     get_be24(pb); /* flags */

  1057.     entries = get_be32(pb);

  1058.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  1059.         return -1;

  1060. 

  1061.     sc->ctts_count = entries;

  1062.     sc->ctts_data = av_malloc(entries * sizeof(MOV_stts_t));

  1063.     if (!sc->ctts_data)

  1064.         return -1;

  1065.     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1066. 

  1067.     for(i=0; i<entries; i++) {

  1068.         int count    =get_be32(pb);

  1069.         int duration =get_be32(pb);

  1070. 

  1071.         if (duration < 0) {

  1072.             av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");

  1073.             sc->ctts_count = 0;

  1074.             url_fskip(pb, 8 * (entries - i - 1));

  1075.             break;

  1076.         }

  1077.         sc->ctts_data[i].count   = count;

  1078.         sc->ctts_data[i].duration= duration;

  1079. 

  1080.         sc->time_rate= ff_gcd(sc->time_rate, duration);

  1081.     }

  1082.     return 0;

  1083. }

  1084. 

  1085. static void mov_build_index(MOVContext *mov, AVStream *st)

  1086. {

  1087.     MOVStreamContext *sc = st->priv_data;

  1088.     offset_t current_offset;

  1089.     int64_t current_dts = 0;

  1090.     unsigned int stts_index = 0;

  1091.     unsigned int stsc_index = 0;

  1092.     unsigned int stss_index = 0;

  1093.     unsigned int i, j;

  1094. 

  1095.     if (sc->sample_sizes || st->codec->codec_type == CODEC_TYPE_VIDEO ||

  1096.         sc->audio_cid == -2) {

  1097.         unsigned int current_sample = 0;

  1098.         unsigned int stts_sample = 0;

  1099.         unsigned int keyframe, sample_size;

  1100.         unsigned int distance = 0;

  1101.         int key_off = sc->keyframes && sc->keyframes[0] == 1;

  1102. 

  1103.         st->nb_frames = sc->sample_count;

  1104.         for (i = 0; i < sc->chunk_count; i++) {

  1105.             current_offset = sc->chunk_offsets[i];

  1106.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1107.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1108.                 stsc_index++;

  1109.             for (j = 0; j < sc->sample_to_chunk[stsc_index].count; j++) {

  1110.                 if (current_sample >= sc->sample_count) {

  1111.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1112.                     goto out;

  1113.                 }

  1114.                 keyframe = !sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index];

  1115.                 if (keyframe) {

  1116.                     distance = 0;

  1117.                     if (stss_index + 1 < sc->keyframe_count)

  1118.                         stss_index++;

  1119.                 }

  1120.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1121.                 dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1122.                         "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1123.                         current_offset, current_dts, sample_size, distance, keyframe);

  1124.                 if(sc->sample_to_chunk[stsc_index].id - 1 == sc->pseudo_stream_id)

  1125.                     av_add_index_entry(st, current_offset, current_dts, sample_size, distance,

  1126.                                     keyframe ? AVINDEX_KEYFRAME : 0);

  1127.                 current_offset += sample_size;

  1128.                 assert(sc->stts_data[stts_index].duration % sc->time_rate == 0);

  1129.                 current_dts += sc->stts_data[stts_index].duration / sc->time_rate;

  1130.                 distance++;

  1131.                 stts_sample++;

  1132.                 current_sample++;

  1133.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1134.                     stts_sample = 0;

  1135.                     stts_index++;

  1136.                 }

  1137.             }

  1138.         }

  1139.     } else { /* read whole chunk */

  1140.         unsigned int chunk_samples, chunk_size, chunk_duration;

  1141.         unsigned int frames = 1;

  1142.         for (i = 0; i < sc->chunk_count; i++) {

  1143.             current_offset = sc->chunk_offsets[i];

  1144.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1145.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1146.                 stsc_index++;

  1147.             chunk_samples = sc->sample_to_chunk[stsc_index].count;

  1148.             /* get chunk size, beware of alaw/ulaw/mace */

  1149.             if (sc->samples_per_frame > 0 &&

  1150.                 (chunk_samples * sc->bytes_per_frame % sc->samples_per_frame == 0)) {

  1151.                 if (sc->samples_per_frame < 1024)

  1152.                     chunk_size = chunk_samples * sc->bytes_per_frame / sc->samples_per_frame;

  1153.                 else {

  1154.                     chunk_size = sc->bytes_per_frame;

  1155.                     frames = chunk_samples / sc->samples_per_frame;

  1156.                     chunk_samples = sc->samples_per_frame;

  1157.                 }

  1158.             } else if (sc->sample_size > 1 || st->codec->bits_per_sample == 8) {

  1159.                 chunk_size = chunk_samples * sc->sample_size;

  1160.             } else {

  1161.                 av_log(mov->fc, AV_LOG_ERROR, "could not determine chunk size, report problem\n");

  1162.                 goto out;

  1163.             }

  1164.             for (j = 0; j < frames; j++) {

  1165.                 av_add_index_entry(st, current_offset, current_dts, chunk_size, 0, AVINDEX_KEYFRAME);

  1166.                 /* get chunk duration */

  1167.                 chunk_duration = 0;

  1168.                 while (chunk_samples > 0) {

  1169.                     if (chunk_samples < sc->stts_data[stts_index].count) {

  1170.                         chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1171.                         sc->stts_data[stts_index].count -= chunk_samples;

  1172.                         break;

  1173.                     } else {

  1174.                         chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1175.                         chunk_samples -= sc->stts_data[stts_index].count;

  1176.                         if (stts_index + 1 < sc->stts_count)

  1177.                             stts_index++;

  1178.                     }

  1179.                 }

  1180.                 current_offset += sc->bytes_per_frame;

  1181.                 dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", size %d, "

  1182.                         "duration %d\n", st->index, i, current_offset, current_dts, chunk_size, chunk_duration);

  1183.                 assert(chunk_duration % sc->time_rate == 0);

  1184.                 current_dts += chunk_duration / sc->time_rate;

  1185.             }

  1186.         }

  1187.     }

  1188.  out:

  1189.     /* adjust sample count to avindex entries */

  1190.     sc->sample_count = st->nb_index_entries;

  1191. }

  1192. 

  1193. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1194. {

  1195.     AVStream *st;

  1196.     MOVStreamContext *sc;

  1197.     int ret;

  1198. 

  1199.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1200.     if (!st) return AVERROR(ENOMEM);

  1201.     sc = av_mallocz(sizeof(MOVStreamContext));

  1202.     if (!sc) return AVERROR(ENOMEM);

  1203. 

  1204.     st->priv_data = sc;

  1205.     st->codec->codec_type = CODEC_TYPE_DATA;

  1206.     st->start_time = 0; /* XXX: check */

  1207. 

  1208.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  1209.         return ret;

  1210. 

  1211.     /* sanity checks */

  1212.     if(!sc->stts_count || !sc->chunk_count || !sc->sample_to_chunk_sz ||

  1213.        (!sc->sample_size && !sc->sample_count)){

  1214.         av_log(c->fc, AV_LOG_ERROR, "missing mandatory atoms, broken header\n");

  1215.         sc->sample_count = 0; //ignore track

  1216.         return 0;

  1217.     }

  1218.     if(!sc->time_rate)

  1219.         sc->time_rate=1;

  1220.     if(!sc->time_scale)

  1221.         sc->time_scale= c->time_scale;

  1222.     av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);

  1223. 

  1224.     if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)

  1225.         st->codec->frame_size = av_rescale(sc->time_rate, st->codec->sample_rate, sc->time_scale);

  1226. 

  1227.     if(st->duration != AV_NOPTS_VALUE){

  1228.         assert(st->duration % sc->time_rate == 0);

  1229.         st->duration /= sc->time_rate;

  1230.     }

  1231.     sc->ffindex = st->index;

  1232.     mov_build_index(c, st);

  1233. 

  1234.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  1235.         if (url_fopen(&sc->pb, sc->drefs[sc->dref_id-1].path, URL_RDONLY) < 0)

  1236.             av_log(c->fc, AV_LOG_ERROR, "stream %d, error opening external essence: %s\n",

  1237.                    st->index, strerror(errno));

  1238.     } else

  1239.         sc->pb = c->fc->pb;

  1240. 

  1241.     switch (st->codec->codec_id) {

  1242. #ifdef CONFIG_H261_DECODER

  1243.     case CODEC_ID_H261:

  1244. #endif

  1245. #ifdef CONFIG_H263_DECODER

  1246.     case CODEC_ID_H263:

  1247. #endif

  1248. #ifdef CONFIG_MPEG4_DECODER

  1249.     case CODEC_ID_MPEG4:

  1250. #endif

  1251.         st->codec->width= 0; /* let decoder init width/height */

  1252.         st->codec->height= 0;

  1253.         break;

  1254. #ifdef CONFIG_LIBFAAD

  1255.     case CODEC_ID_AAC:

  1256. #endif

  1257. #ifdef CONFIG_VORBIS_DECODER

  1258.     case CODEC_ID_VORBIS:

  1259. #endif

  1260.     case CODEC_ID_MP3ON4:

  1261.         st->codec->sample_rate= 0; /* let decoder init parameters properly */

  1262.         break;

  1263.     }

  1264. 

  1265.     /* Do not need those anymore. */

  1266.     av_freep(&sc->chunk_offsets);

  1267.     av_freep(&sc->sample_to_chunk);

  1268.     av_freep(&sc->sample_sizes);

  1269.     av_freep(&sc->keyframes);

  1270.     av_freep(&sc->stts_data);

  1271. 

  1272.     return 0;

  1273. }

  1274. 

  1275. static void mov_parse_udta_string(ByteIOContext *pb, char *str, int size)

  1276. {

  1277.     uint16_t str_size = get_be16(pb); /* string length */;

  1278. 

  1279.     get_be16(pb); /* skip language */

  1280.     get_buffer(pb, str, FFMIN(size, str_size));

  1281. }

  1282. 

  1283. static int mov_read_udta(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1284. {

  1285.     uint64_t end = url_ftell(pb) + atom.size;

  1286. 

  1287.     while (url_ftell(pb) + 8 < end) {

  1288.         uint32_t tag_size = get_be32(pb);

  1289.         uint32_t tag      = get_le32(pb);

  1290.         uint64_t next     = url_ftell(pb) + tag_size - 8;

  1291. 

  1292.         if (next > end) // stop if tag_size is wrong

  1293.             break;

  1294. 

  1295.         switch (tag) {

  1296.         case MKTAG(0xa9,'n','a','m'):

  1297.             mov_parse_udta_string(pb, c->fc->title,     sizeof(c->fc->title));

  1298.             break;

  1299.         case MKTAG(0xa9,'w','r','t'):

  1300.             mov_parse_udta_string(pb, c->fc->author,    sizeof(c->fc->author));

  1301.             break;

  1302.         case MKTAG(0xa9,'c','p','y'):

  1303.             mov_parse_udta_string(pb, c->fc->copyright, sizeof(c->fc->copyright));

  1304.             break;

  1305.         case MKTAG(0xa9,'i','n','f'):

  1306.             mov_parse_udta_string(pb, c->fc->comment,   sizeof(c->fc->comment));

  1307.             break;

  1308.         default:

  1309.             break;

  1310.         }

  1311. 

  1312.         url_fseek(pb, next, SEEK_SET);

  1313.     }

  1314. 

  1315.     return 0;

  1316. }

  1317. 

  1318. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1319. {

  1320.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1321.     int version = get_byte(pb);

  1322. 

  1323.     get_be24(pb); /* flags */

  1324.     /*

  1325.     MOV_TRACK_ENABLED 0x0001

  1326.     MOV_TRACK_IN_MOVIE 0x0002

  1327.     MOV_TRACK_IN_PREVIEW 0x0004

  1328.     MOV_TRACK_IN_POSTER 0x0008

  1329.     */

  1330. 

  1331.     if (version == 1) {

  1332.         get_be64(pb);

  1333.         get_be64(pb);

  1334.     } else {

  1335.         get_be32(pb); /* creation time */

  1336.         get_be32(pb); /* modification time */

  1337.     }

  1338.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1339.     get_be32(pb); /* reserved */

  1340.     st->start_time = 0; /* check */

  1341.     (version == 1) ? get_be64(pb) : get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

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

  1343.     get_be32(pb); /* reserved */

  1344. 

  1345.     get_be16(pb); /* layer */

  1346.     get_be16(pb); /* alternate group */

  1347.     get_be16(pb); /* volume */

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

  1349. 

  1350.     url_fskip(pb, 36); /* display matrix */

  1351. 

  1352.     /* those are fixed-point */

  1353.     get_be32(pb); /* track width */

  1354.     get_be32(pb); /* track height */

  1355. 

  1356.     return 0;

  1357. }

  1358. 

  1359. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1360. /* like the files created with Adobe Premiere 5.0, for samples see */

  1361. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1362. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1363. {

  1364.     int err;

  1365. 

  1366.     if (atom.size < 8)

  1367.         return 0; /* continue */

  1368.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1369.         url_fskip(pb, atom.size - 4);

  1370.         return 0;

  1371.     }

  1372.     atom.type = get_le32(pb);

  1373.     atom.offset += 8;

  1374.     atom.size -= 8;

  1375.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1376.         url_fskip(pb, atom.size);

  1377.         return 0;

  1378.     }

  1379.     err = mov_read_mdat(c, pb, atom);

  1380.     return err;

  1381. }

  1382. 

  1383. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1384. {

  1385. #ifdef CONFIG_ZLIB

  1386.     ByteIOContext ctx;

  1387.     uint8_t *cmov_data;

  1388.     uint8_t *moov_data; /* uncompressed data */

  1389.     long cmov_len, moov_len;

  1390.     int ret;

  1391. 

  1392.     get_be32(pb); /* dcom atom */

  1393.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1394.         return -1;

  1395.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1396.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1397.         return -1;

  1398.     }

  1399.     get_be32(pb); /* cmvd atom */

  1400.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1401.         return -1;

  1402.     moov_len = get_be32(pb); /* uncompressed size */

  1403.     cmov_len = atom.size - 6 * 4;

  1404. 

  1405.     cmov_data = av_malloc(cmov_len);

  1406.     if (!cmov_data)

  1407.         return -1;

  1408.     moov_data = av_malloc(moov_len);

  1409.     if (!moov_data) {

  1410.         av_free(cmov_data);

  1411.         return -1;

  1412.     }

  1413.     get_buffer(pb, cmov_data, cmov_len);

  1414.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1415.         return -1;

  1416.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  1417.         return -1;

  1418.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1419.     atom.offset = 0;

  1420.     atom.size = moov_len;

  1421. #ifdef DEBUG

  1422. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1423. #endif

  1424.     ret = mov_read_default(c, &ctx, atom);

  1425.     av_free(moov_data);

  1426.     av_free(cmov_data);

  1427.     return ret;

  1428. #else

  1429.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  1430.     return -1;

  1431. #endif

  1432. }

  1433. 

  1434. /* edit list atom */

  1435. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1436. {

  1437.     MOVStreamContext *sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  1438.     int i, edit_count;

  1439. 

  1440.     get_byte(pb); /* version */

  1441.     get_be24(pb); /* flags */

  1442.     edit_count= sc->edit_count = get_be32(pb);     /* entries */

  1443. 

  1444.     for(i=0; i<edit_count; i++){

  1445.         int time;

  1446.         get_be32(pb); /* Track duration */

  1447.         time = get_be32(pb); /* Media time */

  1448.         get_be32(pb); /* Media rate */

  1449.         if (time != 0)

  1450.             av_log(c->fc, AV_LOG_WARNING, "edit list not starting at 0, "

  1451.                    "a/v desync might occur, patch welcome\n");

  1452.     }

  1453.     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, sc->edit_count);

  1454.     return 0;

  1455. }

  1456. 

  1457. static const MOVParseTableEntry mov_default_parse_table[] = {

  1458. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1459. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1460. { MKTAG( 'd', 'i', 'n', 'f' ), mov_read_default },

  1461. { MKTAG( 'd', 'r', 'e', 'f' ), mov_read_dref },

  1462. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1463. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1464. { MKTAG( 'e', 'n', 'd', 'a' ), mov_read_enda },

  1465. { MKTAG( 'f', 'i', 'e', 'l' ), mov_read_extradata },

  1466. { MKTAG( 'f', 't', 'y', 'p' ), mov_read_ftyp },

  1467. { MKTAG( 'g', 'l', 'b', 'l' ), mov_read_glbl },

  1468. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1469. { MKTAG( 'j', 'p', '2', 'h' ), mov_read_extradata },

  1470. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1471. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1472. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1473. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1474. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1475. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1476. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1477. { MKTAG( 'a', 'l', 'a', 'c' ), mov_read_extradata }, /* alac specific atom */

  1478. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_glbl },

  1479. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1480. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1481. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1482. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1483. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1484. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1485. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1486. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1487. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1488. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_udta },

  1489. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1490. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1491. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1492. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1493. { 0, NULL }

  1494. };

  1495. 

  1496. static int mov_probe(AVProbeData *p)

  1497. {

  1498.     unsigned int offset;

  1499.     uint32_t tag;

  1500.     int score = 0;

  1501. 

  1502.     /* check file header */

  1503.     offset = 0;

  1504.     for(;;) {

  1505.         /* ignore invalid offset */

  1506.         if ((offset + 8) > (unsigned int)p->buf_size)

  1507.             return score;

  1508.         tag = AV_RL32(p->buf + offset + 4);

  1509.         switch(tag) {

  1510.         /* check for obvious tags */

  1511.         case MKTAG( 'j', 'P', ' ', ' ' ): /* jpeg 2000 signature */

  1512.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1513.         case MKTAG( 'm', 'd', 'a', 't' ):

  1514.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1515.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1516.             return AVPROBE_SCORE_MAX;

  1517.         /* those are more common words, so rate then a bit less */

  1518.         case MKTAG( 'e', 'd', 'i', 'w' ): /* xdcam files have reverted first tags */

  1519.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1520.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1521.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1522.         case MKTAG( 'p', 'i', 'c', 't' ):

  1523.             return AVPROBE_SCORE_MAX - 5;

  1524.         case MKTAG(0x82,0x82,0x7f,0x7d ):

  1525.         case MKTAG( 'f', 't', 'y', 'p' ):

  1526.         case MKTAG( 's', 'k', 'i', 'p' ):

  1527.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1528.             offset = AV_RB32(p->buf+offset) + offset;

  1529.             /* if we only find those cause probedata is too small at least rate them */

  1530.             score = AVPROBE_SCORE_MAX - 50;

  1531.             break;

  1532.         default:

  1533.             /* unrecognized tag */

  1534.             return score;

  1535.         }

  1536.     }

  1537.     return score;

  1538. }

  1539. 

  1540. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1541. {

  1542.     MOVContext *mov = s->priv_data;

  1543.     ByteIOContext *pb = s->pb;

  1544.     int err;

  1545.     MOV_atom_t atom = { 0, 0, 0 };

  1546. 

  1547.     mov->fc = s;

  1548. 

  1549.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1550.         atom.size = url_fsize(pb);

  1551.     else

  1552.         atom.size = INT64_MAX;

  1553. 

  1554.     /* check MOV header */

  1555.     err = mov_read_default(mov, pb, atom);

  1556.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1557.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1558.                err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1559.         return -1;

  1560.     }

  1561.     dprintf(mov->fc, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1562. 

  1563.     return 0;

  1564. }

  1565. 

  1566. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1567. {

  1568.     MOVContext *mov = s->priv_data;

  1569.     MOVStreamContext *sc = 0;

  1570.     AVIndexEntry *sample = 0;

  1571.     int64_t best_dts = INT64_MAX;

  1572.     int i;

  1573. 

  1574.     for (i = 0; i < s->nb_streams; i++) {

  1575.         AVStream *st = s->streams[i];

  1576.         MOVStreamContext *msc = st->priv_data;

  1577.         if (st->discard != AVDISCARD_ALL && msc->pb && msc->current_sample < msc->sample_count) {

  1578.             AVIndexEntry *current_sample = &st->index_entries[msc->current_sample];

  1579.             int64_t dts = av_rescale(current_sample->timestamp * (int64_t)msc->time_rate,

  1580.                                      AV_TIME_BASE, msc->time_scale);

  1581.             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  1582.             if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||

  1583.                 (!url_is_streamed(s->pb) &&

  1584.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  1585.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  1586.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  1587.                 sample = current_sample;

  1588.                 best_dts = dts;

  1589.                 sc = msc;

  1590.             }

  1591.         }

  1592.     }

  1593.     if (!sample)

  1594.         return -1;

  1595.     /* must be done just before reading, to avoid infinite loop on sample */

  1596.     sc->current_sample++;

  1597.     if (url_fseek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  1598.         av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  1599.                sc->ffindex, sample->pos);

  1600.         return -1;

  1601.     }

  1602.     av_get_packet(sc->pb, pkt, sample->size);

  1603. #ifdef CONFIG_DV_DEMUXER

  1604.     if (mov->dv_demux && sc->dv_audio_container) {

  1605.         dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  1606.         av_free(pkt->data);

  1607.         pkt->size = 0;

  1608.         if (dv_get_packet(mov->dv_demux, pkt) < 0)

  1609.             return -1;

  1610.     }

  1611. #endif

  1612.     pkt->stream_index = sc->ffindex;

  1613.     pkt->dts = sample->timestamp;

  1614.     if (sc->ctts_data) {

  1615.         assert(sc->ctts_data[sc->sample_to_ctime_index].duration % sc->time_rate == 0);

  1616.         pkt->pts = pkt->dts + sc->ctts_data[sc->sample_to_ctime_index].duration / sc->time_rate;

  1617.         /* update ctts context */

  1618.         sc->sample_to_ctime_sample++;

  1619.         if (sc->sample_to_ctime_index < sc->ctts_count &&

  1620.             sc->ctts_data[sc->sample_to_ctime_index].count == sc->sample_to_ctime_sample) {

  1621.             sc->sample_to_ctime_index++;

  1622.             sc->sample_to_ctime_sample = 0;

  1623.         }

  1624.     } else {

  1625.         pkt->pts = pkt->dts;

  1626.     }

  1627.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? PKT_FLAG_KEY : 0;

  1628.     pkt->pos = sample->pos;

  1629.     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  1630.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  1631.     return 0;

  1632. }

  1633. 

  1634. static int mov_seek_stream(AVStream *st, int64_t timestamp, int flags)

  1635. {

  1636.     MOVStreamContext *sc = st->priv_data;

  1637.     int sample, time_sample;

  1638.     int i;

  1639. 

  1640.     sample = av_index_search_timestamp(st, timestamp, flags);

  1641.     dprintf(st->codec, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  1642.     if (sample < 0) /* not sure what to do */

  1643.         return -1;

  1644.     sc->current_sample = sample;

  1645.     dprintf(st->codec, "stream %d, found sample %d\n", st->index, sc->current_sample);

  1646.     /* adjust ctts index */

  1647.     if (sc->ctts_data) {

  1648.         time_sample = 0;

  1649.         for (i = 0; i < sc->ctts_count; i++) {

  1650.             int next = time_sample + sc->ctts_data[i].count;

  1651.             if (next > sc->current_sample) {

  1652.                 sc->sample_to_ctime_index = i;

  1653.                 sc->sample_to_ctime_sample = sc->current_sample - time_sample;

  1654.                 break;

  1655.             }

  1656.             time_sample = next;

  1657.         }

  1658.     }

  1659.     return sample;

  1660. }

  1661. 

  1662. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1663. {

  1664.     AVStream *st;

  1665.     int64_t seek_timestamp, timestamp;

  1666.     int sample;

  1667.     int i;

  1668. 

  1669.     if (stream_index >= s->nb_streams)

  1670.         return -1;

  1671. 

  1672.     st = s->streams[stream_index];

  1673.     sample = mov_seek_stream(st, sample_time, flags);

  1674.     if (sample < 0)

  1675.         return -1;

  1676. 

  1677.     /* adjust seek timestamp to found sample timestamp */

  1678.     seek_timestamp = st->index_entries[sample].timestamp;

  1679. 

  1680.     for (i = 0; i < s->nb_streams; i++) {

  1681.         st = s->streams[i];

  1682.         if (stream_index == i || st->discard == AVDISCARD_ALL)

  1683.             continue;

  1684. 

  1685.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  1686.         mov_seek_stream(st, timestamp, flags);

  1687.     }

  1688.     return 0;

  1689. }

  1690. 

  1691. static int mov_read_close(AVFormatContext *s)

  1692. {

  1693.     int i, j;

  1694.     MOVContext *mov = s->priv_data;

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

  1696.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1697.         av_freep(&sc->ctts_data);

  1698.         for (j=0; j<sc->drefs_count; j++)

  1699.             av_freep(&sc->drefs[j].path);

  1700.         av_freep(&sc->drefs);

  1701.         if (sc->pb && sc->pb != s->pb)

  1702.             url_fclose(sc->pb);

  1703.     }

  1704.     if(mov->dv_demux){

  1705.         for(i=0; i<mov->dv_fctx->nb_streams; i++){

  1706.             av_freep(&mov->dv_fctx->streams[i]->codec);

  1707.             av_freep(&mov->dv_fctx->streams[i]);

  1708.         }

  1709.         av_freep(&mov->dv_fctx);

  1710.         av_freep(&mov->dv_demux);

  1711.     }

  1712.     return 0;

  1713. }

  1714. 

  1715. AVInputFormat mov_demuxer = {

  1716.     "mov,mp4,m4a,3gp,3g2,mj2",

  1717.     "QuickTime/MPEG4/Motion JPEG 2000 format",

  1718.     sizeof(MOVContext),

  1719.     mov_probe,

  1720.     mov_read_header,

  1721.     mov_read_packet,

  1722.     mov_read_close,

  1723.     mov_read_seek,

  1724. };