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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.     int64_t offset;

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

  76. } MOV_atom_t;

  77. 

  78. typedef struct {

  79.     offset_t offset;

  80.     int64_t size;

  81. } MOV_mdat_t;

  82. 

  83. struct MOVParseTableEntry;

  84. 

  85. typedef struct MOVStreamContext {

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

  87.     int next_chunk;

  88.     unsigned int chunk_count;

  89.     int64_t *chunk_offsets;

  90.     unsigned int stts_count;

  91.     MOV_stts_t *stts_data;

  92.     unsigned int ctts_count;

  93.     MOV_stts_t *ctts_data;

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

  95.     unsigned int sample_to_chunk_sz;

  96.     MOV_stsc_t *sample_to_chunk;

  97.     int sample_to_ctime_index;

  98.     int sample_to_ctime_sample;

  99.     unsigned int sample_size;

  100.     unsigned int sample_count;

  101.     int *sample_sizes;

  102.     unsigned int keyframe_count;

  103.     int *keyframes;

  104.     int time_scale;

  105.     int time_rate;

  106.     int current_sample;

  107.     unsigned int bytes_per_frame;

  108.     unsigned int samples_per_frame;

  109.     int dv_audio_container;

  110.     int pseudo_stream_id;

  111. } MOVStreamContext;

  112. 

  113. typedef struct MOVContext {

  114.     AVFormatContext *fc;

  115.     int time_scale;

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

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

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

  119.     AVPaletteControl palette_control;

  120.     MOV_mdat_t *mdat_list;

  121.     int mdat_count;

  122.     DVDemuxContext *dv_demux;

  123.     AVFormatContext *dv_fctx;

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

  125. } MOVContext;

  126. 

  127. 

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

  129. 

  130. /* those functions parse an atom */

  131. /* return code:

  132.  1: found what I wanted, exit

  133.  0: continue to parse next atom

  134.  -1: error occured, exit

  135.  */

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

  137. typedef struct MOVParseTableEntry {

  138.     uint32_t type;

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

  140. } MOVParseTableEntry;

  141. 

  142. static const MOVParseTableEntry mov_default_parse_table[];

  143. 

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

  145. {

  146.     int64_t total_size = 0;

  147.     MOV_atom_t a;

  148.     int i;

  149.     int err = 0;

  150. 

  151.     a.offset = atom.offset;

  152. 

  153.     if (atom.size < 0)

  154.         atom.size = INT64_MAX;

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

  156.         a.size = atom.size;

  157.         a.type=0;

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

  159.             a.size = get_be32(pb);

  160.             a.type = get_le32(pb);

  161.         }

  162.         total_size += 8;

  163.         a.offset += 8;

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

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

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

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

  168.             a.offset += 8;

  169.             total_size += 8;

  170.         }

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

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

  173.             if (a.size <= 8)

  174.                 break;

  175.         }

  176.         a.size -= 8;

  177.         if(a.size < 0)

  178.             break;

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

  180. 

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

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

  183.             /* empty */;

  184. 

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

  186.             url_fskip(pb, a.size);

  187.         } else {

  188.             offset_t start_pos = url_ftell(pb);

  189.             int64_t left;

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

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

  192.                 break;

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

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

  195.                 url_fskip(pb, left);

  196.         }

  197. 

  198.         a.offset += a.size;

  199.         total_size += a.size;

  200.     }

  201. 

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

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

  204.     }

  205. 

  206.     return err;

  207. }

  208. 

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

  210. {

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

  212.     uint32_t type;

  213.     uint32_t ctype;

  214. 

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

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

  217. 

  218.     /* component type */

  219.     ctype = get_le32(pb);

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

  221. 

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

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

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

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

  226.     if(!ctype)

  227.         c->isom = 1;

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

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

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

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

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

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

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

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

  236.         st->codec->codec_id = CODEC_ID_DVD_SUBTITLE;

  237.     }

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

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

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

  241. 

  242.     if(atom.size <= 24)

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

  244. 

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

  246.     return 0;

  247. }

  248. 

  249. static int mp4_read_descr_len(ByteIOContext *pb)

  250. {

  251.     int len = 0;

  252.     int count = 4;

  253.     while (count--) {

  254.         int c = get_byte(pb);

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

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

  257.             break;

  258.     }

  259.     return len;

  260. }

  261. 

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

  263. {

  264.     int len;

  265.     *tag = get_byte(pb);

  266.     len = mp4_read_descr_len(pb);

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

  268.     return len;

  269. }

  270. 

  271. #define MP4ESDescrTag                   0x03

  272. #define MP4DecConfigDescrTag            0x04

  273. #define MP4DecSpecificDescrTag          0x05

  274. 

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

  276. {

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

  278.     int tag, len;

  279. 

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

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

  282.     if (tag == MP4ESDescrTag) {

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

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

  285.     } else

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

  287. 

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

  289.     if (tag == MP4DecConfigDescrTag) {

  290.         int object_type_id = get_byte(pb);

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

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

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

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

  295. 

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

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

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

  299.         if (tag == MP4DecSpecificDescrTag) {

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

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

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

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

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

  305.                 /* from mplayer */

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

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

  308.                 }

  309.             }

  310.         }

  311.     }

  312.     return 0;

  313. }

  314. 

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

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

  317. {

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

  319.         return 0;

  320.     c->mdat_list = av_realloc(c->mdat_list, (c->mdat_count + 1) * sizeof(*c->mdat_list));

  321.     c->mdat_list[c->mdat_count].offset = atom.offset;

  322.     c->mdat_list[c->mdat_count].size = atom.size;

  323.     c->mdat_count++;

  324.     c->found_mdat=1;

  325.     if(c->found_moov)

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

  327.     url_fskip(pb, atom.size);

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

  329. }

  330. 

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

  332. {

  333.     uint32_t type = get_le32(pb);

  334. 

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

  336.         c->isom = 1;

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

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

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

  340.     return 0;

  341. }

  342. 

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

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

  345. {

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

  347.         return -1;

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

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

  350.     c->found_moov=1;

  351.     if(c->found_mdat)

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

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

  354. }

  355. 

  356. 

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

  358. {

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

  360.     MOVStreamContext *sc = st->priv_data;

  361.     int version = get_byte(pb);

  362.     int lang;

  363. 

  364.     if (version > 1)

  365.         return 1; /* unsupported */

  366. 

  367.     get_byte(pb); get_byte(pb);

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

  369. 

  370.     if (version == 1) {

  371.         get_be64(pb);

  372.         get_be64(pb);

  373.     } else {

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

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

  376.     }

  377. 

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

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

  380. 

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

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

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

  384. 

  385.     return 0;

  386. }

  387. 

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

  389. {

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

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

  392. 

  393.     if (version == 1) {

  394.         get_be64(pb);

  395.         get_be64(pb);

  396.     } else {

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

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

  399.     }

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

  401. 

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

  403. 

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

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

  406. 

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

  408. 

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

  410. 

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

  412. 

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

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

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

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

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

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

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

  420. 

  421.     return 0;

  422. }

  423. 

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

  425. {

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

  427. 

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

  429.         return -1;

  430. 

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

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

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

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

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

  436. 

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

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

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

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

  441.     } else

  442.         url_fskip(pb, atom.size);

  443. 

  444.     return 0;

  445. }

  446. 

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

  448. {

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

  450.     int little_endian = get_be16(pb);

  451. 

  452.     if (little_endian) {

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

  454.         case CODEC_ID_PCM_S24BE:

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

  456.             break;

  457.         case CODEC_ID_PCM_S32BE:

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

  459.             break;

  460.         default:

  461.             break;

  462.         }

  463.     }

  464.     return 0;

  465. }

  466. 

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

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

  469. {

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

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

  472.     uint8_t *buf;

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

  474.         return -1;

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

  476.     if(!buf)

  477.         return -1;

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

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

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

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

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

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

  484.     return 0;

  485. }

  486. 

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

  488. {

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

  490. 

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

  492.         return -1;

  493. 

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

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

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

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

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

  499. 

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

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

  502.         } else

  503.             url_fskip(pb, atom.size);

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

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

  506.             return -1;

  507.     } else

  508.         url_fskip(pb, atom.size);

  509.     return 0;

  510. }

  511. 

  512. /**

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

  514.  * nor size unlike mov_read_extradata.

  515.  */

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

  517. {

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

  519. 

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

  521.         return -1;

  522. 

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

  524. 

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

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

  527. 

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

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

  530.     } else

  531.         url_fskip(pb, atom.size);

  532. 

  533.     return 0;

  534. }

  535. 

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

  537. {

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

  539.     MOVStreamContext *sc = st->priv_data;

  540.     unsigned int i, entries;

  541. 

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

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

  544. 

  545.     entries = get_be32(pb);

  546. 

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

  548.         return -1;

  549. 

  550.     sc->chunk_count = entries;

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

  552.     if (!sc->chunk_offsets)

  553.         return -1;

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

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

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

  557.         }

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

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

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

  561.         }

  562.     } else

  563.         return -1;

  564. 

  565.     return 0;

  566. }

  567. 

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

  569. {

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

  571.     MOVStreamContext *sc = st->priv_data;

  572.     int entries, frames_per_sample;

  573.     uint32_t format;

  574.     uint8_t codec_name[32];

  575. 

  576.     /* for palette traversal */

  577.     unsigned int color_depth;

  578.     unsigned int color_start;

  579.     unsigned int color_count;

  580.     unsigned int color_end;

  581.     int color_index;

  582.     int color_dec;

  583.     int color_greyscale;

  584.     const uint8_t *color_table;

  585.     int j, pseudo_stream_id;

  586.     unsigned char r, g, b;

  587. 

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

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

  590. 

  591.     entries = get_be32(pb);

  592. 

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

  594.         enum CodecID id;

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

  596.         offset_t start_pos = url_ftell(pb);

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

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

  599. 

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

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

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

  603. 

  604.         if (st->codec->codec_tag && st->codec->codec_tag != MKTAG('j', 'p', 'e', 'g')) {

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

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

  607.                welcome */

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

  609.             continue;

  610.         }

  611.         sc->pseudo_stream_id= pseudo_stream_id;

  612. 

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

  614.         id = codec_get_id(codec_movaudio_tags, format);

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

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

  617. 

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

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

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

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

  622.             id = codec_get_id(codec_movvideo_tags, format);

  623.             if (id <= 0)

  624.                 id = codec_get_id(codec_bmp_tags, format);

  625.             if (id > 0)

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

  627.         }

  628. 

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

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

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

  632. 

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

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

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

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

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

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

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

  640. 

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

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

  643. 

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

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

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

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

  648. 

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

  650. 

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

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

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

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

  655.             }

  656. 

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

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

  659. 

  660.             /* figure out the palette situation */

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

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

  663. 

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

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

  666.                 (color_depth == 8)) {

  667.                 if (color_greyscale) {

  668.                     /* compute the greyscale palette */

  669.                     color_count = 1 << color_depth;

  670.                     color_index = 255;

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

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

  673.                         r = g = b = color_index;

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

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

  676.                         color_index -= color_dec;

  677.                         if (color_index < 0)

  678.                             color_index = 0;

  679.                     }

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

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

  682.                     color_count = 1 << color_depth;

  683.                     if (color_depth == 2)

  684.                         color_table = ff_qt_default_palette_4;

  685.                     else if (color_depth == 4)

  686.                         color_table = ff_qt_default_palette_16;

  687.                     else

  688.                         color_table = ff_qt_default_palette_256;

  689. 

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

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

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

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

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

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

  696.                     }

  697.                 } else {

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

  699.                     color_start = get_be32(pb);

  700.                     color_count = get_be16(pb);

  701.                     color_end = get_be16(pb);

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

  703.                         (color_end <= 255)) {

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

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

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

  707.                              * up front */

  708.                             get_byte(pb);

  709.                             get_byte(pb);

  710.                             r = get_byte(pb);

  711.                             get_byte(pb);

  712.                             g = get_byte(pb);

  713.                             get_byte(pb);

  714.                             b = get_byte(pb);

  715.                             get_byte(pb);

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

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

  718.                         }

  719.                     }

  720.                 }

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

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

  723.             } else

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

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

  726.             int bits_per_sample;

  727.             uint16_t version = get_be16(pb);

  728. 

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

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

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

  732. 

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

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

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

  736.             /* do we need to force to 16 for AMR ? */

  737. 

  738.             /* handle specific s8 codec */

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

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

  741. 

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

  743. 

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

  745.             case CODEC_ID_PCM_S8:

  746.             case CODEC_ID_PCM_U8:

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

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

  749.                 break;

  750.             case CODEC_ID_PCM_S16LE:

  751.             case CODEC_ID_PCM_S16BE:

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

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

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

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

  756.                 break;

  757.             default:

  758.                 break;

  759.             }

  760. 

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

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

  763.             if(!c->isom) {

  764.                 if(version==1) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  778.                 }

  779.             }

  780. 

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

  782.             if (bits_per_sample) {

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

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

  785.             }

  786.         } else {

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

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

  789.         }

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

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

  792.         if (a.size > 8) {

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

  794.                 return -1;

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

  796.             url_fskip(pb, a.size);

  797.     }

  798. 

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

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

  801.     }

  802. 

  803.     /* special codec parameters handling */

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

  805. #ifdef CONFIG_H261_DECODER

  806.     case CODEC_ID_H261:

  807. #endif

  808. #ifdef CONFIG_H263_DECODER

  809.     case CODEC_ID_H263:

  810. #endif

  811. #ifdef CONFIG_MPEG4_DECODER

  812.     case CODEC_ID_MPEG4:

  813. #endif

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

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

  816.         break;

  817. #ifdef CONFIG_LIBFAAD

  818.     case CODEC_ID_AAC:

  819. #endif

  820. #ifdef CONFIG_VORBIS_DECODER

  821.     case CODEC_ID_VORBIS:

  822. #endif

  823.     case CODEC_ID_MP3ON4:

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

  825.         break;

  826. #ifdef CONFIG_DV_DEMUXER

  827.     case CODEC_ID_DVAUDIO:

  828.         c->dv_fctx = av_alloc_format_context();

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

  830.         if (!c->dv_demux) {

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

  832.             return -1;

  833.         }

  834.         sc->dv_audio_container = 1;

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

  836.         break;

  837. #endif

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

  839.     case CODEC_ID_AMR_WB:

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

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

  842.         break;

  843.     case CODEC_ID_AMR_NB:

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

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

  846.         break;

  847.     case CODEC_ID_MP2:

  848.     case CODEC_ID_MP3:

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

  850.         st->need_parsing = AVSTREAM_PARSE_FULL;

  851.         break;

  852.     case CODEC_ID_ADPCM_MS:

  853.     case CODEC_ID_ADPCM_IMA_WAV:

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

  855.         break;

  856.     default:

  857.         break;

  858.     }

  859. 

  860.     return 0;

  861. }

  862. 

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

  864. {

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

  866.     MOVStreamContext *sc = st->priv_data;

  867.     unsigned int i, entries;

  868. 

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

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

  871. 

  872.     entries = get_be32(pb);

  873. 

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

  875.         return -1;

  876. 

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

  878. 

  879.     sc->sample_to_chunk_sz = entries;

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

  881.     if (!sc->sample_to_chunk)

  882.         return -1;

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

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

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

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

  887.     }

  888.     return 0;

  889. }

  890. 

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

  892. {

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

  894.     MOVStreamContext *sc = st->priv_data;

  895.     unsigned int i, entries;

  896. 

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

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

  899. 

  900.     entries = get_be32(pb);

  901. 

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

  903.         return -1;

  904. 

  905.     sc->keyframe_count = entries;

  906. 

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

  908. 

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

  910.     if (!sc->keyframes)

  911.         return -1;

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

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

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

  915.     }

  916.     return 0;

  917. }

  918. 

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

  920. {

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

  922.     MOVStreamContext *sc = st->priv_data;

  923.     unsigned int i, entries, sample_size;

  924. 

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

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

  927. 

  928.     sample_size = get_be32(pb);

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

  930.         sc->sample_size = sample_size;

  931.     entries = get_be32(pb);

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

  933.         return -1;

  934. 

  935.     sc->sample_count = entries;

  936.     if (sample_size)

  937.         return 0;

  938. 

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

  940. 

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

  942.     if (!sc->sample_sizes)

  943.         return -1;

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

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

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

  947.     }

  948.     return 0;

  949. }

  950. 

  951. static int mov_read_stts(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.     int64_t duration=0;

  957.     int64_t total_sample_count=0;

  958. 

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

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

  961.     entries = get_be32(pb);

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

  963.         return -1;

  964. 

  965.     sc->stts_count = entries;

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

  967.     if (!sc->stts_data)

  968.         return -1;

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

  970. 

  971.     sc->time_rate=0;

  972. 

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

  974.         int sample_duration;

  975.         int sample_count;

  976. 

  977.         sample_count=get_be32(pb);

  978.         sample_duration = get_be32(pb);

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

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

  981. 

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

  983. 

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

  985. 

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

  987.         total_sample_count+=sample_count;

  988.     }

  989. 

  990.     st->nb_frames= total_sample_count;

  991.     if(duration)

  992.         st->duration= duration;

  993.     return 0;

  994. }

  995. 

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

  997. {

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

  999.     MOVStreamContext *sc = st->priv_data;

  1000.     unsigned int i, entries;

  1001. 

  1002.     get_byte(pb); /* version */

  1003.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1004.     entries = get_be32(pb);

  1005.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  1006.         return -1;

  1007. 

  1008.     sc->ctts_count = entries;

  1009.     sc->ctts_data = av_malloc(entries * sizeof(MOV_stts_t));

  1010.     if (!sc->ctts_data)

  1011.         return -1;

  1012.     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1013. 

  1014.     for(i=0; i<entries; i++) {

  1015.         int count    =get_be32(pb);

  1016.         int duration =get_be32(pb);

  1017. 

  1018.         if (duration < 0) {

  1019.             av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");

  1020.             sc->ctts_count = 0;

  1021.             url_fskip(pb, 8 * (entries - i - 1));

  1022.             break;

  1023.         }

  1024.         sc->ctts_data[i].count   = count;

  1025.         sc->ctts_data[i].duration= duration;

  1026. 

  1027.         sc->time_rate= ff_gcd(sc->time_rate, duration);

  1028.     }

  1029.     return 0;

  1030. }

  1031. 

  1032. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1033. {

  1034.     AVStream *st;

  1035.     MOVStreamContext *sc;

  1036. 

  1037.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1038.     if (!st) return -2;

  1039.     sc = av_mallocz(sizeof(MOVStreamContext));

  1040.     if (!sc) {

  1041.         av_free(st);

  1042.         return -1;

  1043.     }

  1044. 

  1045.     st->priv_data = sc;

  1046.     st->codec->codec_type = CODEC_TYPE_DATA;

  1047.     st->start_time = 0; /* XXX: check */

  1048. 

  1049.     return mov_read_default(c, pb, atom);

  1050. }

  1051. 

  1052. static void mov_parse_udta_string(ByteIOContext *pb, char *str, int size)

  1053. {

  1054.     uint16_t str_size = get_be16(pb); /* string length */;

  1055. 

  1056.     get_be16(pb); /* skip language */

  1057.     get_buffer(pb, str, FFMIN(size, str_size));

  1058. }

  1059. 

  1060. static int mov_read_udta(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1061. {

  1062.     uint64_t end = url_ftell(pb) + atom.size;

  1063. 

  1064.     while (url_ftell(pb) + 8 < end) {

  1065.         uint32_t tag_size = get_be32(pb);

  1066.         uint32_t tag      = get_le32(pb);

  1067.         uint64_t next     = url_ftell(pb) + tag_size - 8;

  1068. 

  1069.         if (next > end) // stop if tag_size is wrong

  1070.             break;

  1071. 

  1072.         switch (tag) {

  1073.         case MKTAG(0xa9,'n','a','m'):

  1074.             mov_parse_udta_string(pb, c->fc->title,     sizeof(c->fc->title));

  1075.             break;

  1076.         case MKTAG(0xa9,'w','r','t'):

  1077.             mov_parse_udta_string(pb, c->fc->author,    sizeof(c->fc->author));

  1078.             break;

  1079.         case MKTAG(0xa9,'c','p','y'):

  1080.             mov_parse_udta_string(pb, c->fc->copyright, sizeof(c->fc->copyright));

  1081.             break;

  1082.         case MKTAG(0xa9,'i','n','f'):

  1083.             mov_parse_udta_string(pb, c->fc->comment,   sizeof(c->fc->comment));

  1084.             break;

  1085.         default:

  1086.             break;

  1087.         }

  1088. 

  1089.         url_fseek(pb, next, SEEK_SET);

  1090.     }

  1091. 

  1092.     return 0;

  1093. }

  1094. 

  1095. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1096. {

  1097.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1098.     int version = get_byte(pb);

  1099. 

  1100.     get_byte(pb); get_byte(pb);

  1101.     get_byte(pb); /* flags */

  1102.     /*

  1103.     MOV_TRACK_ENABLED 0x0001

  1104.     MOV_TRACK_IN_MOVIE 0x0002

  1105.     MOV_TRACK_IN_PREVIEW 0x0004

  1106.     MOV_TRACK_IN_POSTER 0x0008

  1107.     */

  1108. 

  1109.     if (version == 1) {

  1110.         get_be64(pb);

  1111.         get_be64(pb);

  1112.     } else {

  1113.         get_be32(pb); /* creation time */

  1114.         get_be32(pb); /* modification time */

  1115.     }

  1116.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1117.     get_be32(pb); /* reserved */

  1118.     st->start_time = 0; /* check */

  1119.     (version == 1) ? get_be64(pb) : get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

  1120.     get_be32(pb); /* reserved */

  1121.     get_be32(pb); /* reserved */

  1122. 

  1123.     get_be16(pb); /* layer */

  1124.     get_be16(pb); /* alternate group */

  1125.     get_be16(pb); /* volume */

  1126.     get_be16(pb); /* reserved */

  1127. 

  1128.     url_fskip(pb, 36); /* display matrix */

  1129. 

  1130.     /* those are fixed-point */

  1131.     get_be32(pb); /* track width */

  1132.     get_be32(pb); /* track height */

  1133. 

  1134.     return 0;

  1135. }

  1136. 

  1137. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1138. /* like the files created with Adobe Premiere 5.0, for samples see */

  1139. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1140. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1141. {

  1142.     int err;

  1143. 

  1144.     if (atom.size < 8)

  1145.         return 0; /* continue */

  1146.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1147.         url_fskip(pb, atom.size - 4);

  1148.         return 0;

  1149.     }

  1150.     atom.type = get_le32(pb);

  1151.     atom.offset += 8;

  1152.     atom.size -= 8;

  1153.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1154.         url_fskip(pb, atom.size);

  1155.         return 0;

  1156.     }

  1157.     err = mov_read_mdat(c, pb, atom);

  1158.     return err;

  1159. }

  1160. 

  1161. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1162. {

  1163. #ifdef CONFIG_ZLIB

  1164.     ByteIOContext ctx;

  1165.     uint8_t *cmov_data;

  1166.     uint8_t *moov_data; /* uncompressed data */

  1167.     long cmov_len, moov_len;

  1168.     int ret;

  1169. 

  1170.     get_be32(pb); /* dcom atom */

  1171.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1172.         return -1;

  1173.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1174.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1175.         return -1;

  1176.     }

  1177.     get_be32(pb); /* cmvd atom */

  1178.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1179.         return -1;

  1180.     moov_len = get_be32(pb); /* uncompressed size */

  1181.     cmov_len = atom.size - 6 * 4;

  1182. 

  1183.     cmov_data = av_malloc(cmov_len);

  1184.     if (!cmov_data)

  1185.         return -1;

  1186.     moov_data = av_malloc(moov_len);

  1187.     if (!moov_data) {

  1188.         av_free(cmov_data);

  1189.         return -1;

  1190.     }

  1191.     get_buffer(pb, cmov_data, cmov_len);

  1192.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1193.         return -1;

  1194.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  1195.         return -1;

  1196.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1197.     atom.offset = 0;

  1198.     atom.size = moov_len;

  1199. #ifdef DEBUG

  1200. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1201. #endif

  1202.     ret = mov_read_default(c, &ctx, atom);

  1203.     av_free(moov_data);

  1204.     av_free(cmov_data);

  1205.     return ret;

  1206. #else

  1207.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  1208.     return -1;

  1209. #endif

  1210. }

  1211. 

  1212. /* edit list atom */

  1213. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1214. {

  1215.     MOVStreamContext *sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  1216.     int i, edit_count;

  1217. 

  1218.     get_byte(pb); /* version */

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

  1220.     edit_count= sc->edit_count = get_be32(pb);     /* entries */

  1221. 

  1222.     for(i=0; i<edit_count; i++){

  1223.         get_be32(pb); /* Track duration */

  1224.         get_be32(pb); /* Media time */

  1225.         get_be32(pb); /* Media rate */

  1226.     }

  1227.     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, sc->edit_count);

  1228.     return 0;

  1229. }

  1230. 

  1231. static const MOVParseTableEntry mov_default_parse_table[] = {

  1232. /* mp4 atoms */

  1233. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1234. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1235. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1236. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1237. { MKTAG( 'e', 'n', 'd', 'a' ), mov_read_enda },

  1238. { MKTAG( 'f', 'i', 'e', 'l' ), mov_read_extradata },

  1239. { MKTAG( 'f', 't', 'y', 'p' ), mov_read_ftyp },

  1240. { MKTAG( 'g', 'l', 'b', 'l' ), mov_read_glbl },

  1241. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1242. { MKTAG( 'j', 'p', '2', 'h' ), mov_read_extradata },

  1243. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1244. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1245. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1246. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1247. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1248. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1249. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1250. { MKTAG( 'a', 'l', 'a', 'c' ), mov_read_extradata }, /* alac specific atom */

  1251. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_glbl },

  1252. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1253. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1254. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1255. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1256. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1257. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1258. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1259. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1260. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1261. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_udta },

  1262. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1263. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1264. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1265. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1266. { 0, NULL }

  1267. };

  1268. 

  1269. /* XXX: is it sufficient ? */

  1270. static int mov_probe(AVProbeData *p)

  1271. {

  1272.     unsigned int offset;

  1273.     uint32_t tag;

  1274.     int score = 0;

  1275. 

  1276.     /* check file header */

  1277.     offset = 0;

  1278.     for(;;) {

  1279.         /* ignore invalid offset */

  1280.         if ((offset + 8) > (unsigned int)p->buf_size)

  1281.             return score;

  1282.         tag = AV_RL32(p->buf + offset + 4);

  1283.         switch(tag) {

  1284.         /* check for obvious tags */

  1285.         case MKTAG( 'j', 'P', ' ', ' ' ): /* jpeg 2000 signature */

  1286.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1287.         case MKTAG( 'm', 'd', 'a', 't' ):

  1288.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1289.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1290.             return AVPROBE_SCORE_MAX;

  1291.         /* those are more common words, so rate then a bit less */

  1292.         case MKTAG( 'e', 'd', 'i', 'w' ): /* xdcam files have reverted first tags */

  1293.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1294.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1295.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1296.         case MKTAG( 'p', 'i', 'c', 't' ):

  1297.             return AVPROBE_SCORE_MAX - 5;

  1298.         case MKTAG( 'f', 't', 'y', 'p' ):

  1299.         case MKTAG( 's', 'k', 'i', 'p' ):

  1300.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1301.             offset = AV_RB32(p->buf+offset) + offset;

  1302.             /* if we only find those cause probedata is too small at least rate them */

  1303.             score = AVPROBE_SCORE_MAX - 50;

  1304.             break;

  1305.         default:

  1306.             /* unrecognized tag */

  1307.             return score;

  1308.         }

  1309.     }

  1310.     return score;

  1311. }

  1312. 

  1313. static void mov_build_index(MOVContext *mov, AVStream *st)

  1314. {

  1315.     MOVStreamContext *sc = st->priv_data;

  1316.     offset_t current_offset;

  1317.     int64_t current_dts = 0;

  1318.     unsigned int stts_index = 0;

  1319.     unsigned int stsc_index = 0;

  1320.     unsigned int stss_index = 0;

  1321.     unsigned int i, j, k;

  1322. 

  1323.     if (sc->sample_sizes || st->codec->codec_type == CODEC_TYPE_VIDEO || sc->dv_audio_container) {

  1324.         unsigned int current_sample = 0;

  1325.         unsigned int stts_sample = 0;

  1326.         unsigned int keyframe, sample_size;

  1327.         unsigned int distance = 0;

  1328. 

  1329.         st->nb_frames = sc->sample_count;

  1330.         for (i = 0; i < sc->chunk_count; i++) {

  1331.             current_offset = sc->chunk_offsets[i];

  1332.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1333.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1334.                 stsc_index++;

  1335.             for (j = 0; j < sc->sample_to_chunk[stsc_index].count; j++) {

  1336.                 if (current_sample >= sc->sample_count) {

  1337.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1338.                     goto out;

  1339.                 }

  1340.                 keyframe = !sc->keyframe_count || current_sample + 1 == sc->keyframes[stss_index];

  1341.                 if (keyframe) {

  1342.                     distance = 0;

  1343.                     if (stss_index + 1 < sc->keyframe_count)

  1344.                         stss_index++;

  1345.                 }

  1346.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1347.                 dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1348.                         "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1349.                         current_offset, current_dts, sample_size, distance, keyframe);

  1350.                 if(sc->sample_to_chunk[stsc_index].id - 1 == sc->pseudo_stream_id)

  1351.                     av_add_index_entry(st, current_offset, current_dts, sample_size, distance,

  1352.                                     keyframe ? AVINDEX_KEYFRAME : 0);

  1353.                 current_offset += sample_size;

  1354.                 assert(sc->stts_data[stts_index].duration % sc->time_rate == 0);

  1355.                 current_dts += sc->stts_data[stts_index].duration / sc->time_rate;

  1356.                 distance++;

  1357.                 stts_sample++;

  1358.                 current_sample++;

  1359.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1360.                     stts_sample = 0;

  1361.                     stts_index++;

  1362.                 }

  1363.             }

  1364.         }

  1365.     } else { /* read whole chunk */

  1366.         unsigned int chunk_samples, chunk_size, chunk_duration;

  1367.         for (i = 0; i < sc->chunk_count; i++) {

  1368.             current_offset = sc->chunk_offsets[i];

  1369.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1370.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1371.                 stsc_index++;

  1372.             chunk_samples = sc->sample_to_chunk[stsc_index].count;

  1373.             /* get chunk size */

  1374.             if (sc->sample_size > 1 ||

  1375.                 st->codec->codec_id == CODEC_ID_PCM_U8 || st->codec->codec_id == CODEC_ID_PCM_S8)

  1376.                 chunk_size = chunk_samples * sc->sample_size;

  1377.             else if (sc->samples_per_frame > 0 &&

  1378.                      (chunk_samples * sc->bytes_per_frame % sc->samples_per_frame == 0))

  1379.                 chunk_size = chunk_samples * sc->bytes_per_frame / sc->samples_per_frame;

  1380.             else { /* workaround to find nearest next chunk offset */

  1381.                 chunk_size = INT_MAX;

  1382.                 for (j = 0; j < mov->fc->nb_streams; j++) {

  1383.                     MOVStreamContext *msc = mov->fc->streams[j]->priv_data;

  1384.                     for (k = msc->next_chunk; k < msc->chunk_count; k++) {

  1385.                         if (msc->chunk_offsets[k] > current_offset &&

  1386.                             msc->chunk_offsets[k] - current_offset < chunk_size) {

  1387.                             chunk_size = msc->chunk_offsets[k] - current_offset;

  1388.                             msc->next_chunk = k;

  1389.                             break;

  1390.                         }

  1391.                     }

  1392.                 }

  1393.                 /* check for last chunk */

  1394.                 if (chunk_size == INT_MAX)

  1395.                     for (j = 0; j < mov->mdat_count; j++) {

  1396.                         dprintf(mov->fc, "mdat %d, offset %"PRIx64", size %"PRId64", current offset %"PRIx64"\n",

  1397.                                 j, mov->mdat_list[j].offset, mov->mdat_list[j].size, current_offset);

  1398.                         if (mov->mdat_list[j].offset <= current_offset &&

  1399.                             mov->mdat_list[j].offset + mov->mdat_list[j].size > current_offset)

  1400.                             chunk_size = mov->mdat_list[j].offset + mov->mdat_list[j].size - current_offset;

  1401.                     }

  1402.                 assert(chunk_size != INT_MAX);

  1403.                 for (j = 0; j < mov->fc->nb_streams; j++) {

  1404.                     MOVStreamContext *msc = mov->fc->streams[j]->priv_data;

  1405.                     msc->next_chunk = 0;

  1406.                 }

  1407.             }

  1408.             av_add_index_entry(st, current_offset, current_dts, chunk_size, 0, AVINDEX_KEYFRAME);

  1409.             /* get chunk duration */

  1410.             chunk_duration = 0;

  1411.             while (chunk_samples > 0) {

  1412.                 if (chunk_samples < sc->stts_data[stts_index].count) {

  1413.                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1414.                     sc->stts_data[stts_index].count -= chunk_samples;

  1415.                     break;

  1416.                 } else {

  1417.                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1418.                     chunk_samples -= sc->stts_data[stts_index].count;

  1419.                     if (stts_index + 1 < sc->stts_count) {

  1420.                         stts_index++;

  1421.                     }

  1422.                 }

  1423.             }

  1424.             dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", size %d, "

  1425.                     "duration %d\n", st->index, i, current_offset, current_dts, chunk_size, chunk_duration);

  1426.             assert(chunk_duration % sc->time_rate == 0);

  1427.             current_dts += chunk_duration / sc->time_rate;

  1428.         }

  1429.     }

  1430.  out:

  1431.     /* adjust sample count to avindex entries */

  1432.     sc->sample_count = st->nb_index_entries;

  1433. }

  1434. 

  1435. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1436. {

  1437.     MOVContext *mov = s->priv_data;

  1438.     ByteIOContext *pb = s->pb;

  1439.     int i, err;

  1440.     MOV_atom_t atom = { 0, 0, 0 };

  1441. 

  1442.     mov->fc = s;

  1443. 

  1444.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1445.         atom.size = url_fsize(pb);

  1446.     else

  1447.         atom.size = INT64_MAX;

  1448. 

  1449.     /* check MOV header */

  1450.     err = mov_read_default(mov, pb, atom);

  1451.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1452.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1453.                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1454.         return -1;

  1455.     }

  1456.     dprintf(mov->fc, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1457. 

  1458.     for(i=0; i<s->nb_streams; i++) {

  1459.         AVStream *st = s->streams[i];

  1460.         MOVStreamContext *sc = st->priv_data;

  1461.         /* sanity checks */

  1462.         if(!sc->stts_count || !sc->chunk_count || !sc->sample_to_chunk_sz ||

  1463.            (!sc->sample_size && !sc->sample_count)){

  1464.             av_log(s, AV_LOG_ERROR, "missing mandatory atoms, broken header\n");

  1465.             sc->sample_count = 0; //ignore track

  1466.             continue;

  1467.         }

  1468.         if(!sc->time_rate)

  1469.             sc->time_rate=1;

  1470.         if(!sc->time_scale)

  1471.             sc->time_scale= mov->time_scale;

  1472.         av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);

  1473. 

  1474.         if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)

  1475.             st->codec->frame_size = sc->stts_data[0].duration;

  1476. 

  1477.         if(st->duration != AV_NOPTS_VALUE){

  1478.             assert(st->duration % sc->time_rate == 0);

  1479.             st->duration /= sc->time_rate;

  1480.         }

  1481.         sc->ffindex = i;

  1482.         mov_build_index(mov, st);

  1483.     }

  1484. 

  1485.     for(i=0; i<s->nb_streams; i++) {

  1486.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1487.         /* Do not need those anymore. */

  1488.         av_freep(&sc->chunk_offsets);

  1489.         av_freep(&sc->sample_to_chunk);

  1490.         av_freep(&sc->sample_sizes);

  1491.         av_freep(&sc->keyframes);

  1492.         av_freep(&sc->stts_data);

  1493.     }

  1494.     av_freep(&mov->mdat_list);

  1495.     return 0;

  1496. }

  1497. 

  1498. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1499. {

  1500.     MOVContext *mov = s->priv_data;

  1501.     MOVStreamContext *sc = 0;

  1502.     AVIndexEntry *sample = 0;

  1503.     int64_t best_dts = INT64_MAX;

  1504.     int i;

  1505. 

  1506.     for (i = 0; i < s->nb_streams; i++) {

  1507.         AVStream *st = s->streams[i];

  1508.         MOVStreamContext *msc = st->priv_data;

  1509.         if (st->discard != AVDISCARD_ALL && msc->current_sample < msc->sample_count) {

  1510.             AVIndexEntry *current_sample = &st->index_entries[msc->current_sample];

  1511.             int64_t dts = av_rescale(current_sample->timestamp * (int64_t)msc->time_rate,

  1512.                                      AV_TIME_BASE, msc->time_scale);

  1513.             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  1514.             if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||

  1515.                 (!url_is_streamed(s->pb) &&

  1516.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  1517.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))) {

  1518.                 sample = current_sample;

  1519.                 best_dts = dts;

  1520.                 sc = msc;

  1521.             }

  1522.         }

  1523.     }

  1524.     if (!sample)

  1525.         return -1;

  1526.     /* must be done just before reading, to avoid infinite loop on sample */

  1527.     sc->current_sample++;

  1528.     if (url_fseek(s->pb, sample->pos, SEEK_SET) != sample->pos) {

  1529.         av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  1530.                sc->ffindex, sample->pos);

  1531.         return -1;

  1532.     }

  1533. #ifdef CONFIG_DV_DEMUXER

  1534.     if (sc->dv_audio_container) {

  1535.         dv_get_packet(mov->dv_demux, pkt);

  1536.         dprintf(s, "dv audio pkt size %d\n", pkt->size);

  1537.     } else {

  1538. #endif

  1539.         av_get_packet(s->pb, pkt, sample->size);

  1540. #ifdef CONFIG_DV_DEMUXER

  1541.         if (mov->dv_demux) {

  1542.             void *pkt_destruct_func = pkt->destruct;

  1543.             dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  1544.             pkt->destruct = pkt_destruct_func;

  1545.         }

  1546.     }

  1547. #endif

  1548.     pkt->stream_index = sc->ffindex;

  1549.     pkt->dts = sample->timestamp;

  1550.     if (sc->ctts_data) {

  1551.         assert(sc->ctts_data[sc->sample_to_ctime_index].duration % sc->time_rate == 0);

  1552.         pkt->pts = pkt->dts + sc->ctts_data[sc->sample_to_ctime_index].duration / sc->time_rate;

  1553.         /* update ctts context */

  1554.         sc->sample_to_ctime_sample++;

  1555.         if (sc->sample_to_ctime_index < sc->ctts_count &&

  1556.             sc->ctts_data[sc->sample_to_ctime_index].count == sc->sample_to_ctime_sample) {

  1557.             sc->sample_to_ctime_index++;

  1558.             sc->sample_to_ctime_sample = 0;

  1559.         }

  1560.     } else {

  1561.         pkt->pts = pkt->dts;

  1562.     }

  1563.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? PKT_FLAG_KEY : 0;

  1564.     pkt->pos = sample->pos;

  1565.     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  1566.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  1567.     return 0;

  1568. }

  1569. 

  1570. static int mov_seek_stream(AVStream *st, int64_t timestamp, int flags)

  1571. {

  1572.     MOVStreamContext *sc = st->priv_data;

  1573.     int sample, time_sample;

  1574.     int i;

  1575. 

  1576.     sample = av_index_search_timestamp(st, timestamp, flags);

  1577.     dprintf(st->codec, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  1578.     if (sample < 0) /* not sure what to do */

  1579.         return -1;

  1580.     sc->current_sample = sample;

  1581.     dprintf(st->codec, "stream %d, found sample %d\n", st->index, sc->current_sample);

  1582.     /* adjust ctts index */

  1583.     if (sc->ctts_data) {

  1584.         time_sample = 0;

  1585.         for (i = 0; i < sc->ctts_count; i++) {

  1586.             int next = time_sample + sc->ctts_data[i].count;

  1587.             if (next > sc->current_sample) {

  1588.                 sc->sample_to_ctime_index = i;

  1589.                 sc->sample_to_ctime_sample = sc->current_sample - time_sample;

  1590.                 break;

  1591.             }

  1592.             time_sample = next;

  1593.         }

  1594.     }

  1595.     return sample;

  1596. }

  1597. 

  1598. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1599. {

  1600.     AVStream *st;

  1601.     int64_t seek_timestamp, timestamp;

  1602.     int sample;

  1603.     int i;

  1604. 

  1605.     if (stream_index >= s->nb_streams)

  1606.         return -1;

  1607. 

  1608.     st = s->streams[stream_index];

  1609.     sample = mov_seek_stream(st, sample_time, flags);

  1610.     if (sample < 0)

  1611.         return -1;

  1612. 

  1613.     /* adjust seek timestamp to found sample timestamp */

  1614.     seek_timestamp = st->index_entries[sample].timestamp;

  1615. 

  1616.     for (i = 0; i < s->nb_streams; i++) {

  1617.         st = s->streams[i];

  1618.         if (stream_index == i || st->discard == AVDISCARD_ALL)

  1619.             continue;

  1620. 

  1621.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  1622.         mov_seek_stream(st, timestamp, flags);

  1623.     }

  1624.     return 0;

  1625. }

  1626. 

  1627. static int mov_read_close(AVFormatContext *s)

  1628. {

  1629.     int i;

  1630.     MOVContext *mov = s->priv_data;

  1631.     for(i=0; i<s->nb_streams; i++) {

  1632.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1633.         av_freep(&sc->ctts_data);

  1634.     }

  1635.     if(mov->dv_demux){

  1636.         for(i=0; i<mov->dv_fctx->nb_streams; i++){

  1637.             av_freep(&mov->dv_fctx->streams[i]->codec);

  1638.             av_freep(&mov->dv_fctx->streams[i]);

  1639.         }

  1640.         av_freep(&mov->dv_fctx);

  1641.         av_freep(&mov->dv_demux);

  1642.     }

  1643.     return 0;

  1644. }

  1645. 

  1646. AVInputFormat mov_demuxer = {

  1647.     "mov,mp4,m4a,3gp,3g2,mj2",

  1648.     "QuickTime/MPEG4/Motion JPEG 2000 format",

  1649.     sizeof(MOVContext),

  1650.     mov_probe,

  1651.     mov_read_header,

  1652.     mov_read_packet,

  1653.     mov_read_close,

  1654.     mov_read_seek,

  1655. };