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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.     }

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

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

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

  240. 

  241.     if(atom.size <= 24)

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

  243. 

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

  245.     return 0;

  246. }

  247. 

  248. static int mp4_read_descr_len(ByteIOContext *pb)

  249. {

  250.     int len = 0;

  251.     int count = 4;

  252.     while (count--) {

  253.         int c = get_byte(pb);

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

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

  256.             break;

  257.     }

  258.     return len;

  259. }

  260. 

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

  262. {

  263.     int len;

  264.     *tag = get_byte(pb);

  265.     len = mp4_read_descr_len(pb);

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

  267.     return len;

  268. }

  269. 

  270. #define MP4ESDescrTag                   0x03

  271. #define MP4DecConfigDescrTag            0x04

  272. #define MP4DecSpecificDescrTag          0x05

  273. 

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

  275. {

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

  277.     int tag, len;

  278. 

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

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

  281.     if (tag == MP4ESDescrTag) {

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

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

  284.     } else

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

  286. 

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

  288.     if (tag == MP4DecConfigDescrTag) {

  289.         int object_type_id = get_byte(pb);

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

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

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

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

  294. 

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

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

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

  298.         if (tag == MP4DecSpecificDescrTag) {

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

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

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

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

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

  304.                 /* from mplayer */

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

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

  307.                 }

  308.             }

  309.         }

  310.     }

  311.     return 0;

  312. }

  313. 

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

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

  316. {

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

  318.         return 0;

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

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

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

  322.     c->mdat_count++;

  323.     c->found_mdat=1;

  324.     if(c->found_moov)

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

  326.     url_fskip(pb, atom.size);

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

  328. }

  329. 

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

  331. {

  332.     uint32_t type = get_le32(pb);

  333. 

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

  335.         c->isom = 1;

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

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

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

  339.     return 0;

  340. }

  341. 

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

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

  344. {

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

  346.         return -1;

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

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

  349.     c->found_moov=1;

  350.     if(c->found_mdat)

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

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

  353. }

  354. 

  355. 

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

  357. {

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

  359.     MOVStreamContext *sc = st->priv_data;

  360.     int version = get_byte(pb);

  361.     int lang;

  362. 

  363.     if (version > 1)

  364.         return 1; /* unsupported */

  365. 

  366.     get_byte(pb); get_byte(pb);

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

  368. 

  369.     if (version == 1) {

  370.         get_be64(pb);

  371.         get_be64(pb);

  372.     } else {

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

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

  375.     }

  376. 

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

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

  379. 

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

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

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

  383. 

  384.     return 0;

  385. }

  386. 

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

  388. {

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

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

  391. 

  392.     if (version == 1) {

  393.         get_be64(pb);

  394.         get_be64(pb);

  395.     } else {

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

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

  398.     }

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

  400. 

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

  402. 

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

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

  405. 

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

  407. 

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

  409. 

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

  411. 

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

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

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

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

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

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

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

  419. 

  420.     return 0;

  421. }

  422. 

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

  424. {

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

  426. 

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

  428.         return -1;

  429. 

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

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

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

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

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

  435. 

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

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

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

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

  440.     } else

  441.         url_fskip(pb, atom.size);

  442. 

  443.     return 0;

  444. }

  445. 

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

  447. {

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

  449.     int little_endian = get_be16(pb);

  450. 

  451.     if (little_endian) {

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

  453.         case CODEC_ID_PCM_S24BE:

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

  455.             break;

  456.         case CODEC_ID_PCM_S32BE:

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

  458.             break;

  459.         default:

  460.             break;

  461.         }

  462.     }

  463.     return 0;

  464. }

  465. 

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

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

  468. {

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

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

  471.     uint8_t *buf;

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

  473.         return -1;

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

  475.     if(!buf)

  476.         return -1;

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

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

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

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

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

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

  483.     return 0;

  484. }

  485. 

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

  487. {

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

  489. 

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

  491.         return -1;

  492. 

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

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

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

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

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

  498. 

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

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

  501.         } else

  502.             url_fskip(pb, atom.size);

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

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

  505.             return -1;

  506.     } else

  507.         url_fskip(pb, atom.size);

  508.     return 0;

  509. }

  510. 

  511. /**

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

  513.  * nor size unlike mov_read_extradata.

  514.  */

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

  516. {

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

  518. 

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

  520.         return -1;

  521. 

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

  523. 

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

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

  526. 

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

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

  529.     } else

  530.         url_fskip(pb, atom.size);

  531. 

  532.     return 0;

  533. }

  534. 

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

  536. {

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

  538.     MOVStreamContext *sc = st->priv_data;

  539.     unsigned int i, entries;

  540. 

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

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

  543. 

  544.     entries = get_be32(pb);

  545. 

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

  547.         return -1;

  548. 

  549.     sc->chunk_count = entries;

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

  551.     if (!sc->chunk_offsets)

  552.         return -1;

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

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

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

  556.         }

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

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

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

  560.         }

  561.     } else

  562.         return -1;

  563. 

  564.     return 0;

  565. }

  566. 

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

  568. {

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

  570.     MOVStreamContext *sc = st->priv_data;

  571.     int entries, frames_per_sample;

  572.     uint32_t format;

  573.     uint8_t codec_name[32];

  574. 

  575.     /* for palette traversal */

  576.     unsigned int color_depth;

  577.     unsigned int color_start;

  578.     unsigned int color_count;

  579.     unsigned int color_end;

  580.     int color_index;

  581.     int color_dec;

  582.     int color_greyscale;

  583.     const uint8_t *color_table;

  584.     int j, pseudo_stream_id;

  585.     unsigned char r, g, b;

  586. 

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

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

  589. 

  590.     entries = get_be32(pb);

  591. 

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

  593.         enum CodecID id;

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

  595.         offset_t start_pos = url_ftell(pb);

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

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

  598. 

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

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

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

  602. 

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

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

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

  606.                welcome */

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

  608.             continue;

  609.         }

  610.         sc->pseudo_stream_id= pseudo_stream_id;

  611. 

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

  613.         id = codec_get_id(codec_movaudio_tags, format);

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

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

  616. 

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

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

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

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

  621.             id = codec_get_id(codec_movvideo_tags, format);

  622.             if (id <= 0)

  623.                 id = codec_get_id(codec_bmp_tags, format);

  624.             if (id > 0)

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

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

  627.                 id = codec_get_id(ff_codec_movsubtitle_tags, format);

  628.                 if(id > 0)

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

  630.             }

  631.         }

  632. 

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

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

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

  636. 

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

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

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

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

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

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

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

  644. 

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

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

  647. 

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

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

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

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

  652. 

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

  654. 

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

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

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

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

  659.             }

  660. 

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

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

  663. 

  664.             /* figure out the palette situation */

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

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

  667. 

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

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

  670.                 (color_depth == 8)) {

  671.                 if (color_greyscale) {

  672.                     /* compute the greyscale palette */

  673.                     color_count = 1 << color_depth;

  674.                     color_index = 255;

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

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

  677.                         r = g = b = color_index;

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

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

  680.                         color_index -= color_dec;

  681.                         if (color_index < 0)

  682.                             color_index = 0;

  683.                     }

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

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

  686.                     color_count = 1 << color_depth;

  687.                     if (color_depth == 2)

  688.                         color_table = ff_qt_default_palette_4;

  689.                     else if (color_depth == 4)

  690.                         color_table = ff_qt_default_palette_16;

  691.                     else

  692.                         color_table = ff_qt_default_palette_256;

  693. 

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

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

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

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

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

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

  700.                     }

  701.                 } else {

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

  703.                     color_start = get_be32(pb);

  704.                     color_count = get_be16(pb);

  705.                     color_end = get_be16(pb);

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

  707.                         (color_end <= 255)) {

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

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

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

  711.                              * up front */

  712.                             get_byte(pb);

  713.                             get_byte(pb);

  714.                             r = get_byte(pb);

  715.                             get_byte(pb);

  716.                             g = get_byte(pb);

  717.                             get_byte(pb);

  718.                             b = get_byte(pb);

  719.                             get_byte(pb);

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

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

  722.                         }

  723.                     }

  724.                 }

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

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

  727.             } else

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

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

  730.             int bits_per_sample;

  731.             uint16_t version = get_be16(pb);

  732. 

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

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

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

  736. 

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

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

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

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

  741. 

  742.             /* handle specific s8 codec */

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

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

  745. 

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

  747. 

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

  749.             case CODEC_ID_PCM_S8:

  750.             case CODEC_ID_PCM_U8:

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

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

  753.                 break;

  754.             case CODEC_ID_PCM_S16LE:

  755.             case CODEC_ID_PCM_S16BE:

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

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

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

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

  760.                 break;

  761.             default:

  762.                 break;

  763.             }

  764. 

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

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

  767.             if(!c->isom) {

  768.                 if(version==1) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  782.                 }

  783.             }

  784. 

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

  786.             if (bits_per_sample) {

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

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

  789.             }

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

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

  792.         } else {

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

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

  795.         }

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

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

  798.         if (a.size > 8) {

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

  800.                 return -1;

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

  802.             url_fskip(pb, a.size);

  803.     }

  804. 

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

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

  807.     }

  808. 

  809.     /* special codec parameters handling */

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

  811. #ifdef CONFIG_H261_DECODER

  812.     case CODEC_ID_H261:

  813. #endif

  814. #ifdef CONFIG_H263_DECODER

  815.     case CODEC_ID_H263:

  816. #endif

  817. #ifdef CONFIG_MPEG4_DECODER

  818.     case CODEC_ID_MPEG4:

  819. #endif

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

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

  822.         break;

  823. #ifdef CONFIG_LIBFAAD

  824.     case CODEC_ID_AAC:

  825. #endif

  826. #ifdef CONFIG_VORBIS_DECODER

  827.     case CODEC_ID_VORBIS:

  828. #endif

  829.     case CODEC_ID_MP3ON4:

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

  831.         break;

  832. #ifdef CONFIG_DV_DEMUXER

  833.     case CODEC_ID_DVAUDIO:

  834.         c->dv_fctx = av_alloc_format_context();

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

  836.         if (!c->dv_demux) {

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

  838.             return -1;

  839.         }

  840.         sc->dv_audio_container = 1;

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

  842.         break;

  843. #endif

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

  845.     case CODEC_ID_AMR_WB:

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

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

  848.         break;

  849.     case CODEC_ID_AMR_NB:

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

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

  852.         break;

  853.     case CODEC_ID_MP2:

  854.     case CODEC_ID_MP3:

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

  856.         st->need_parsing = AVSTREAM_PARSE_FULL;

  857.         break;

  858.     case CODEC_ID_ADPCM_MS:

  859.     case CODEC_ID_ADPCM_IMA_WAV:

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

  861.         break;

  862.     default:

  863.         break;

  864.     }

  865. 

  866.     return 0;

  867. }

  868. 

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

  870. {

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

  872.     MOVStreamContext *sc = st->priv_data;

  873.     unsigned int i, entries;

  874. 

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

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

  877. 

  878.     entries = get_be32(pb);

  879. 

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

  881.         return -1;

  882. 

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

  884. 

  885.     sc->sample_to_chunk_sz = entries;

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

  887.     if (!sc->sample_to_chunk)

  888.         return -1;

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

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

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

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

  893.     }

  894.     return 0;

  895. }

  896. 

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

  898. {

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

  900.     MOVStreamContext *sc = st->priv_data;

  901.     unsigned int i, entries;

  902. 

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

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

  905. 

  906.     entries = get_be32(pb);

  907. 

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

  909.         return -1;

  910. 

  911.     sc->keyframe_count = entries;

  912. 

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

  914. 

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

  916.     if (!sc->keyframes)

  917.         return -1;

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

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

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

  921.     }

  922.     return 0;

  923. }

  924. 

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

  926. {

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

  928.     MOVStreamContext *sc = st->priv_data;

  929.     unsigned int i, entries, sample_size;

  930. 

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

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

  933. 

  934.     sample_size = get_be32(pb);

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

  936.         sc->sample_size = sample_size;

  937.     entries = get_be32(pb);

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

  939.         return -1;

  940. 

  941.     sc->sample_count = entries;

  942.     if (sample_size)

  943.         return 0;

  944. 

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

  946. 

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

  948.     if (!sc->sample_sizes)

  949.         return -1;

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

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

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

  953.     }

  954.     return 0;

  955. }

  956. 

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

  958. {

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

  960.     MOVStreamContext *sc = st->priv_data;

  961.     unsigned int i, entries;

  962.     int64_t duration=0;

  963.     int64_t total_sample_count=0;

  964. 

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

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

  967.     entries = get_be32(pb);

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

  969.         return -1;

  970. 

  971.     sc->stts_count = entries;

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

  973.     if (!sc->stts_data)

  974.         return -1;

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

  976. 

  977.     sc->time_rate=0;

  978. 

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

  980.         int sample_duration;

  981.         int sample_count;

  982. 

  983.         sample_count=get_be32(pb);

  984.         sample_duration = get_be32(pb);

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

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

  987. 

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

  989. 

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

  991. 

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

  993.         total_sample_count+=sample_count;

  994.     }

  995. 

  996.     st->nb_frames= total_sample_count;

  997.     if(duration)

  998.         st->duration= duration;

  999.     return 0;

  1000. }

  1001. 

  1002. static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1003. {

  1004.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1005.     MOVStreamContext *sc = st->priv_data;

  1006.     unsigned int i, entries;

  1007. 

  1008.     get_byte(pb); /* version */

  1009.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1010.     entries = get_be32(pb);

  1011.     if(entries >= UINT_MAX / sizeof(MOV_stts_t))

  1012.         return -1;

  1013. 

  1014.     sc->ctts_count = entries;

  1015.     sc->ctts_data = av_malloc(entries * sizeof(MOV_stts_t));

  1016.     if (!sc->ctts_data)

  1017.         return -1;

  1018.     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1019. 

  1020.     for(i=0; i<entries; i++) {

  1021.         int count    =get_be32(pb);

  1022.         int duration =get_be32(pb);

  1023. 

  1024.         if (duration < 0) {

  1025.             av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");

  1026.             sc->ctts_count = 0;

  1027.             url_fskip(pb, 8 * (entries - i - 1));

  1028.             break;

  1029.         }

  1030.         sc->ctts_data[i].count   = count;

  1031.         sc->ctts_data[i].duration= duration;

  1032. 

  1033.         sc->time_rate= ff_gcd(sc->time_rate, duration);

  1034.     }

  1035.     return 0;

  1036. }

  1037. 

  1038. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1039. {

  1040.     AVStream *st;

  1041.     MOVStreamContext *sc;

  1042. 

  1043.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1044.     if (!st) return -2;

  1045.     sc = av_mallocz(sizeof(MOVStreamContext));

  1046.     if (!sc) {

  1047.         av_free(st);

  1048.         return -1;

  1049.     }

  1050. 

  1051.     st->priv_data = sc;

  1052.     st->codec->codec_type = CODEC_TYPE_DATA;

  1053.     st->start_time = 0; /* XXX: check */

  1054. 

  1055.     return mov_read_default(c, pb, atom);

  1056. }

  1057. 

  1058. static void mov_parse_udta_string(ByteIOContext *pb, char *str, int size)

  1059. {

  1060.     uint16_t str_size = get_be16(pb); /* string length */;

  1061. 

  1062.     get_be16(pb); /* skip language */

  1063.     get_buffer(pb, str, FFMIN(size, str_size));

  1064. }

  1065. 

  1066. static int mov_read_udta(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1067. {

  1068.     uint64_t end = url_ftell(pb) + atom.size;

  1069. 

  1070.     while (url_ftell(pb) + 8 < end) {

  1071.         uint32_t tag_size = get_be32(pb);

  1072.         uint32_t tag      = get_le32(pb);

  1073.         uint64_t next     = url_ftell(pb) + tag_size - 8;

  1074. 

  1075.         if (next > end) // stop if tag_size is wrong

  1076.             break;

  1077. 

  1078.         switch (tag) {

  1079.         case MKTAG(0xa9,'n','a','m'):

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

  1081.             break;

  1082.         case MKTAG(0xa9,'w','r','t'):

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

  1084.             break;

  1085.         case MKTAG(0xa9,'c','p','y'):

  1086.             mov_parse_udta_string(pb, c->fc->copyright, sizeof(c->fc->copyright));

  1087.             break;

  1088.         case MKTAG(0xa9,'i','n','f'):

  1089.             mov_parse_udta_string(pb, c->fc->comment,   sizeof(c->fc->comment));

  1090.             break;

  1091.         default:

  1092.             break;

  1093.         }

  1094. 

  1095.         url_fseek(pb, next, SEEK_SET);

  1096.     }

  1097. 

  1098.     return 0;

  1099. }

  1100. 

  1101. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1102. {

  1103.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1104.     int version = get_byte(pb);

  1105. 

  1106.     get_byte(pb); get_byte(pb);

  1107.     get_byte(pb); /* flags */

  1108.     /*

  1109.     MOV_TRACK_ENABLED 0x0001

  1110.     MOV_TRACK_IN_MOVIE 0x0002

  1111.     MOV_TRACK_IN_PREVIEW 0x0004

  1112.     MOV_TRACK_IN_POSTER 0x0008

  1113.     */

  1114. 

  1115.     if (version == 1) {

  1116.         get_be64(pb);

  1117.         get_be64(pb);

  1118.     } else {

  1119.         get_be32(pb); /* creation time */

  1120.         get_be32(pb); /* modification time */

  1121.     }

  1122.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1123.     get_be32(pb); /* reserved */

  1124.     st->start_time = 0; /* check */

  1125.     (version == 1) ? get_be64(pb) : get_be32(pb); /* highlevel (considering edits) duration in movie timebase */

  1126.     get_be32(pb); /* reserved */

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

  1128. 

  1129.     get_be16(pb); /* layer */

  1130.     get_be16(pb); /* alternate group */

  1131.     get_be16(pb); /* volume */

  1132.     get_be16(pb); /* reserved */

  1133. 

  1134.     url_fskip(pb, 36); /* display matrix */

  1135. 

  1136.     /* those are fixed-point */

  1137.     get_be32(pb); /* track width */

  1138.     get_be32(pb); /* track height */

  1139. 

  1140.     return 0;

  1141. }

  1142. 

  1143. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1144. /* like the files created with Adobe Premiere 5.0, for samples see */

  1145. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1146. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1147. {

  1148.     int err;

  1149. 

  1150.     if (atom.size < 8)

  1151.         return 0; /* continue */

  1152.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1153.         url_fskip(pb, atom.size - 4);

  1154.         return 0;

  1155.     }

  1156.     atom.type = get_le32(pb);

  1157.     atom.offset += 8;

  1158.     atom.size -= 8;

  1159.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1160.         url_fskip(pb, atom.size);

  1161.         return 0;

  1162.     }

  1163.     err = mov_read_mdat(c, pb, atom);

  1164.     return err;

  1165. }

  1166. 

  1167. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1168. {

  1169. #ifdef CONFIG_ZLIB

  1170.     ByteIOContext ctx;

  1171.     uint8_t *cmov_data;

  1172.     uint8_t *moov_data; /* uncompressed data */

  1173.     long cmov_len, moov_len;

  1174.     int ret;

  1175. 

  1176.     get_be32(pb); /* dcom atom */

  1177.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1178.         return -1;

  1179.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1180.         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");

  1181.         return -1;

  1182.     }

  1183.     get_be32(pb); /* cmvd atom */

  1184.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1185.         return -1;

  1186.     moov_len = get_be32(pb); /* uncompressed size */

  1187.     cmov_len = atom.size - 6 * 4;

  1188. 

  1189.     cmov_data = av_malloc(cmov_len);

  1190.     if (!cmov_data)

  1191.         return -1;

  1192.     moov_data = av_malloc(moov_len);

  1193.     if (!moov_data) {

  1194.         av_free(cmov_data);

  1195.         return -1;

  1196.     }

  1197.     get_buffer(pb, cmov_data, cmov_len);

  1198.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1199.         return -1;

  1200.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  1201.         return -1;

  1202.     atom.type = MKTAG( 'm', 'o', 'o', 'v' );

  1203.     atom.offset = 0;

  1204.     atom.size = moov_len;

  1205. #ifdef DEBUG

  1206. //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }

  1207. #endif

  1208.     ret = mov_read_default(c, &ctx, atom);

  1209.     av_free(moov_data);

  1210.     av_free(cmov_data);

  1211.     return ret;

  1212. #else

  1213.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  1214.     return -1;

  1215. #endif

  1216. }

  1217. 

  1218. /* edit list atom */

  1219. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1220. {

  1221.     MOVStreamContext *sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  1222.     int i, edit_count;

  1223. 

  1224.     get_byte(pb); /* version */

  1225.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1226.     edit_count= sc->edit_count = get_be32(pb);     /* entries */

  1227. 

  1228.     for(i=0; i<edit_count; i++){

  1229.         get_be32(pb); /* Track duration */

  1230.         get_be32(pb); /* Media time */

  1231.         get_be32(pb); /* Media rate */

  1232.     }

  1233.     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, sc->edit_count);

  1234.     return 0;

  1235. }

  1236. 

  1237. static const MOVParseTableEntry mov_default_parse_table[] = {

  1238. /* mp4 atoms */

  1239. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1240. { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */

  1241. { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },

  1242. { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },

  1243. { MKTAG( 'e', 'n', 'd', 'a' ), mov_read_enda },

  1244. { MKTAG( 'f', 'i', 'e', 'l' ), mov_read_extradata },

  1245. { MKTAG( 'f', 't', 'y', 'p' ), mov_read_ftyp },

  1246. { MKTAG( 'g', 'l', 'b', 'l' ), mov_read_glbl },

  1247. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1248. { MKTAG( 'j', 'p', '2', 'h' ), mov_read_extradata },

  1249. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1250. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1251. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1252. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1253. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1254. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1255. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */

  1256. { MKTAG( 'a', 'l', 'a', 'c' ), mov_read_extradata }, /* alac specific atom */

  1257. { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_glbl },

  1258. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1259. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1260. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1261. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1262. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1263. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1264. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1265. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1266. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1267. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_udta },

  1268. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },

  1269. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1270. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1271. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1272. { 0, NULL }

  1273. };

  1274. 

  1275. /* XXX: is it sufficient ? */

  1276. static int mov_probe(AVProbeData *p)

  1277. {

  1278.     unsigned int offset;

  1279.     uint32_t tag;

  1280.     int score = 0;

  1281. 

  1282.     /* check file header */

  1283.     offset = 0;

  1284.     for(;;) {

  1285.         /* ignore invalid offset */

  1286.         if ((offset + 8) > (unsigned int)p->buf_size)

  1287.             return score;

  1288.         tag = AV_RL32(p->buf + offset + 4);

  1289.         switch(tag) {

  1290.         /* check for obvious tags */

  1291.         case MKTAG( 'j', 'P', ' ', ' ' ): /* jpeg 2000 signature */

  1292.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1293.         case MKTAG( 'm', 'd', 'a', 't' ):

  1294.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1295.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1296.             return AVPROBE_SCORE_MAX;

  1297.         /* those are more common words, so rate then a bit less */

  1298.         case MKTAG( 'e', 'd', 'i', 'w' ): /* xdcam files have reverted first tags */

  1299.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1300.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1301.         case MKTAG( 'j', 'u', 'n', 'k' ):

  1302.         case MKTAG( 'p', 'i', 'c', 't' ):

  1303.             return AVPROBE_SCORE_MAX - 5;

  1304.         case MKTAG( 'f', 't', 'y', 'p' ):

  1305.         case MKTAG( 's', 'k', 'i', 'p' ):

  1306.         case MKTAG( 'u', 'u', 'i', 'd' ):

  1307.             offset = AV_RB32(p->buf+offset) + offset;

  1308.             /* if we only find those cause probedata is too small at least rate them */

  1309.             score = AVPROBE_SCORE_MAX - 50;

  1310.             break;

  1311.         default:

  1312.             /* unrecognized tag */

  1313.             return score;

  1314.         }

  1315.     }

  1316.     return score;

  1317. }

  1318. 

  1319. static void mov_build_index(MOVContext *mov, AVStream *st)

  1320. {

  1321.     MOVStreamContext *sc = st->priv_data;

  1322.     offset_t current_offset;

  1323.     int64_t current_dts = 0;

  1324.     unsigned int stts_index = 0;

  1325.     unsigned int stsc_index = 0;

  1326.     unsigned int stss_index = 0;

  1327.     unsigned int i, j, k;

  1328. 

  1329.     if (sc->sample_sizes || st->codec->codec_type == CODEC_TYPE_VIDEO || sc->dv_audio_container) {

  1330.         unsigned int current_sample = 0;

  1331.         unsigned int stts_sample = 0;

  1332.         unsigned int keyframe, sample_size;

  1333.         unsigned int distance = 0;

  1334. 

  1335.         st->nb_frames = sc->sample_count;

  1336.         for (i = 0; i < sc->chunk_count; i++) {

  1337.             current_offset = sc->chunk_offsets[i];

  1338.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1339.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1340.                 stsc_index++;

  1341.             for (j = 0; j < sc->sample_to_chunk[stsc_index].count; j++) {

  1342.                 if (current_sample >= sc->sample_count) {

  1343.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1344.                     goto out;

  1345.                 }

  1346.                 keyframe = !sc->keyframe_count || current_sample + 1 == sc->keyframes[stss_index];

  1347.                 if (keyframe) {

  1348.                     distance = 0;

  1349.                     if (stss_index + 1 < sc->keyframe_count)

  1350.                         stss_index++;

  1351.                 }

  1352.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1353.                 dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1354.                         "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1355.                         current_offset, current_dts, sample_size, distance, keyframe);

  1356.                 if(sc->sample_to_chunk[stsc_index].id - 1 == sc->pseudo_stream_id)

  1357.                     av_add_index_entry(st, current_offset, current_dts, sample_size, distance,

  1358.                                     keyframe ? AVINDEX_KEYFRAME : 0);

  1359.                 current_offset += sample_size;

  1360.                 assert(sc->stts_data[stts_index].duration % sc->time_rate == 0);

  1361.                 current_dts += sc->stts_data[stts_index].duration / sc->time_rate;

  1362.                 distance++;

  1363.                 stts_sample++;

  1364.                 current_sample++;

  1365.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1366.                     stts_sample = 0;

  1367.                     stts_index++;

  1368.                 }

  1369.             }

  1370.         }

  1371.     } else { /* read whole chunk */

  1372.         unsigned int chunk_samples, chunk_size, chunk_duration;

  1373.         for (i = 0; i < sc->chunk_count; i++) {

  1374.             current_offset = sc->chunk_offsets[i];

  1375.             if (stsc_index + 1 < sc->sample_to_chunk_sz &&

  1376.                 i + 1 == sc->sample_to_chunk[stsc_index + 1].first)

  1377.                 stsc_index++;

  1378.             chunk_samples = sc->sample_to_chunk[stsc_index].count;

  1379.             /* get chunk size */

  1380.             if (sc->sample_size > 1 ||

  1381.                 st->codec->codec_id == CODEC_ID_PCM_U8 || st->codec->codec_id == CODEC_ID_PCM_S8)

  1382.                 chunk_size = chunk_samples * sc->sample_size;

  1383.             else if (sc->samples_per_frame > 0 &&

  1384.                      (chunk_samples * sc->bytes_per_frame % sc->samples_per_frame == 0))

  1385.                 chunk_size = chunk_samples * sc->bytes_per_frame / sc->samples_per_frame;

  1386.             else { /* workaround to find nearest next chunk offset */

  1387.                 chunk_size = INT_MAX;

  1388.                 for (j = 0; j < mov->fc->nb_streams; j++) {

  1389.                     MOVStreamContext *msc = mov->fc->streams[j]->priv_data;

  1390.                     for (k = msc->next_chunk; k < msc->chunk_count; k++) {

  1391.                         if (msc->chunk_offsets[k] > current_offset &&

  1392.                             msc->chunk_offsets[k] - current_offset < chunk_size) {

  1393.                             chunk_size = msc->chunk_offsets[k] - current_offset;

  1394.                             msc->next_chunk = k;

  1395.                             break;

  1396.                         }

  1397.                     }

  1398.                 }

  1399.                 /* check for last chunk */

  1400.                 if (chunk_size == INT_MAX)

  1401.                     for (j = 0; j < mov->mdat_count; j++) {

  1402.                         dprintf(mov->fc, "mdat %d, offset %"PRIx64", size %"PRId64", current offset %"PRIx64"\n",

  1403.                                 j, mov->mdat_list[j].offset, mov->mdat_list[j].size, current_offset);

  1404.                         if (mov->mdat_list[j].offset <= current_offset &&

  1405.                             mov->mdat_list[j].offset + mov->mdat_list[j].size > current_offset)

  1406.                             chunk_size = mov->mdat_list[j].offset + mov->mdat_list[j].size - current_offset;

  1407.                     }

  1408.                 assert(chunk_size != INT_MAX);

  1409.                 for (j = 0; j < mov->fc->nb_streams; j++) {

  1410.                     MOVStreamContext *msc = mov->fc->streams[j]->priv_data;

  1411.                     msc->next_chunk = 0;

  1412.                 }

  1413.             }

  1414.             av_add_index_entry(st, current_offset, current_dts, chunk_size, 0, AVINDEX_KEYFRAME);

  1415.             /* get chunk duration */

  1416.             chunk_duration = 0;

  1417.             while (chunk_samples > 0) {

  1418.                 if (chunk_samples < sc->stts_data[stts_index].count) {

  1419.                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1420.                     sc->stts_data[stts_index].count -= chunk_samples;

  1421.                     break;

  1422.                 } else {

  1423.                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;

  1424.                     chunk_samples -= sc->stts_data[stts_index].count;

  1425.                     if (stts_index + 1 < sc->stts_count) {

  1426.                         stts_index++;

  1427.                     }

  1428.                 }

  1429.             }

  1430.             dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", size %d, "

  1431.                     "duration %d\n", st->index, i, current_offset, current_dts, chunk_size, chunk_duration);

  1432.             assert(chunk_duration % sc->time_rate == 0);

  1433.             current_dts += chunk_duration / sc->time_rate;

  1434.         }

  1435.     }

  1436.  out:

  1437.     /* adjust sample count to avindex entries */

  1438.     sc->sample_count = st->nb_index_entries;

  1439. }

  1440. 

  1441. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1442. {

  1443.     MOVContext *mov = s->priv_data;

  1444.     ByteIOContext *pb = s->pb;

  1445.     int i, err;

  1446.     MOV_atom_t atom = { 0, 0, 0 };

  1447. 

  1448.     mov->fc = s;

  1449. 

  1450.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1451.         atom.size = url_fsize(pb);

  1452.     else

  1453.         atom.size = INT64_MAX;

  1454. 

  1455.     /* check MOV header */

  1456.     err = mov_read_default(mov, pb, atom);

  1457.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1458.         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",

  1459.                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1460.         return -1;

  1461.     }

  1462.     dprintf(mov->fc, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1463. 

  1464.     for(i=0; i<s->nb_streams; i++) {

  1465.         AVStream *st = s->streams[i];

  1466.         MOVStreamContext *sc = st->priv_data;

  1467.         /* sanity checks */

  1468.         if(!sc->stts_count || !sc->chunk_count || !sc->sample_to_chunk_sz ||

  1469.            (!sc->sample_size && !sc->sample_count)){

  1470.             av_log(s, AV_LOG_ERROR, "missing mandatory atoms, broken header\n");

  1471.             sc->sample_count = 0; //ignore track

  1472.             continue;

  1473.         }

  1474.         if(!sc->time_rate)

  1475.             sc->time_rate=1;

  1476.         if(!sc->time_scale)

  1477.             sc->time_scale= mov->time_scale;

  1478.         av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);

  1479. 

  1480.         if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)

  1481.             st->codec->frame_size = sc->stts_data[0].duration;

  1482. 

  1483.         if(st->duration != AV_NOPTS_VALUE){

  1484.             assert(st->duration % sc->time_rate == 0);

  1485.             st->duration /= sc->time_rate;

  1486.         }

  1487.         sc->ffindex = i;

  1488.         mov_build_index(mov, st);

  1489.     }

  1490. 

  1491.     for(i=0; i<s->nb_streams; i++) {

  1492.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1493.         /* Do not need those anymore. */

  1494.         av_freep(&sc->chunk_offsets);

  1495.         av_freep(&sc->sample_to_chunk);

  1496.         av_freep(&sc->sample_sizes);

  1497.         av_freep(&sc->keyframes);

  1498.         av_freep(&sc->stts_data);

  1499.     }

  1500.     av_freep(&mov->mdat_list);

  1501.     return 0;

  1502. }

  1503. 

  1504. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1505. {

  1506.     MOVContext *mov = s->priv_data;

  1507.     MOVStreamContext *sc = 0;

  1508.     AVIndexEntry *sample = 0;

  1509.     int64_t best_dts = INT64_MAX;

  1510.     int i;

  1511. 

  1512.     for (i = 0; i < s->nb_streams; i++) {

  1513.         AVStream *st = s->streams[i];

  1514.         MOVStreamContext *msc = st->priv_data;

  1515.         if (st->discard != AVDISCARD_ALL && msc->current_sample < msc->sample_count) {

  1516.             AVIndexEntry *current_sample = &st->index_entries[msc->current_sample];

  1517.             int64_t dts = av_rescale(current_sample->timestamp * (int64_t)msc->time_rate,

  1518.                                      AV_TIME_BASE, msc->time_scale);

  1519.             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  1520.             if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||

  1521.                 (!url_is_streamed(s->pb) &&

  1522.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  1523.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))) {

  1524.                 sample = current_sample;

  1525.                 best_dts = dts;

  1526.                 sc = msc;

  1527.             }

  1528.         }

  1529.     }

  1530.     if (!sample)

  1531.         return -1;

  1532.     /* must be done just before reading, to avoid infinite loop on sample */

  1533.     sc->current_sample++;

  1534.     if (url_fseek(s->pb, sample->pos, SEEK_SET) != sample->pos) {

  1535.         av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  1536.                sc->ffindex, sample->pos);

  1537.         return -1;

  1538.     }

  1539. #ifdef CONFIG_DV_DEMUXER

  1540.     if (sc->dv_audio_container) {

  1541.         dv_get_packet(mov->dv_demux, pkt);

  1542.         dprintf(s, "dv audio pkt size %d\n", pkt->size);

  1543.     } else {

  1544. #endif

  1545.         av_get_packet(s->pb, pkt, sample->size);

  1546. #ifdef CONFIG_DV_DEMUXER

  1547.         if (mov->dv_demux) {

  1548.             void *pkt_destruct_func = pkt->destruct;

  1549.             dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  1550.             pkt->destruct = pkt_destruct_func;

  1551.         }

  1552.     }

  1553. #endif

  1554.     pkt->stream_index = sc->ffindex;

  1555.     pkt->dts = sample->timestamp;

  1556.     if (sc->ctts_data) {

  1557.         assert(sc->ctts_data[sc->sample_to_ctime_index].duration % sc->time_rate == 0);

  1558.         pkt->pts = pkt->dts + sc->ctts_data[sc->sample_to_ctime_index].duration / sc->time_rate;

  1559.         /* update ctts context */

  1560.         sc->sample_to_ctime_sample++;

  1561.         if (sc->sample_to_ctime_index < sc->ctts_count &&

  1562.             sc->ctts_data[sc->sample_to_ctime_index].count == sc->sample_to_ctime_sample) {

  1563.             sc->sample_to_ctime_index++;

  1564.             sc->sample_to_ctime_sample = 0;

  1565.         }

  1566.     } else {

  1567.         pkt->pts = pkt->dts;

  1568.     }

  1569.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? PKT_FLAG_KEY : 0;

  1570.     pkt->pos = sample->pos;

  1571.     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  1572.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  1573.     return 0;

  1574. }

  1575. 

  1576. static int mov_seek_stream(AVStream *st, int64_t timestamp, int flags)

  1577. {

  1578.     MOVStreamContext *sc = st->priv_data;

  1579.     int sample, time_sample;

  1580.     int i;

  1581. 

  1582.     sample = av_index_search_timestamp(st, timestamp, flags);

  1583.     dprintf(st->codec, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  1584.     if (sample < 0) /* not sure what to do */

  1585.         return -1;

  1586.     sc->current_sample = sample;

  1587.     dprintf(st->codec, "stream %d, found sample %d\n", st->index, sc->current_sample);

  1588.     /* adjust ctts index */

  1589.     if (sc->ctts_data) {

  1590.         time_sample = 0;

  1591.         for (i = 0; i < sc->ctts_count; i++) {

  1592.             int next = time_sample + sc->ctts_data[i].count;

  1593.             if (next > sc->current_sample) {

  1594.                 sc->sample_to_ctime_index = i;

  1595.                 sc->sample_to_ctime_sample = sc->current_sample - time_sample;

  1596.                 break;

  1597.             }

  1598.             time_sample = next;

  1599.         }

  1600.     }

  1601.     return sample;

  1602. }

  1603. 

  1604. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1605. {

  1606.     AVStream *st;

  1607.     int64_t seek_timestamp, timestamp;

  1608.     int sample;

  1609.     int i;

  1610. 

  1611.     if (stream_index >= s->nb_streams)

  1612.         return -1;

  1613. 

  1614.     st = s->streams[stream_index];

  1615.     sample = mov_seek_stream(st, sample_time, flags);

  1616.     if (sample < 0)

  1617.         return -1;

  1618. 

  1619.     /* adjust seek timestamp to found sample timestamp */

  1620.     seek_timestamp = st->index_entries[sample].timestamp;

  1621. 

  1622.     for (i = 0; i < s->nb_streams; i++) {

  1623.         st = s->streams[i];

  1624.         if (stream_index == i || st->discard == AVDISCARD_ALL)

  1625.             continue;

  1626. 

  1627.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  1628.         mov_seek_stream(st, timestamp, flags);

  1629.     }

  1630.     return 0;

  1631. }

  1632. 

  1633. static int mov_read_close(AVFormatContext *s)

  1634. {

  1635.     int i;

  1636.     MOVContext *mov = s->priv_data;

  1637.     for(i=0; i<s->nb_streams; i++) {

  1638.         MOVStreamContext *sc = s->streams[i]->priv_data;

  1639.         av_freep(&sc->ctts_data);

  1640.     }

  1641.     if(mov->dv_demux){

  1642.         for(i=0; i<mov->dv_fctx->nb_streams; i++){

  1643.             av_freep(&mov->dv_fctx->streams[i]->codec);

  1644.             av_freep(&mov->dv_fctx->streams[i]);

  1645.         }

  1646.         av_freep(&mov->dv_fctx);

  1647.         av_freep(&mov->dv_demux);

  1648.     }

  1649.     return 0;

  1650. }

  1651. 

  1652. AVInputFormat mov_demuxer = {

  1653.     "mov,mp4,m4a,3gp,3g2,mj2",

  1654.     "QuickTime/MPEG4/Motion JPEG 2000 format",

  1655.     sizeof(MOVContext),

  1656.     mov_probe,

  1657.     mov_read_header,

  1658.     mov_read_packet,

  1659.     mov_read_close,

  1660.     mov_read_seek,

  1661. };