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FFmpeg/libavformat/mov.c

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  1. /*

  2.  * MOV decoder.

  3.  * Copyright (c) 2001 Fabrice Bellard.

  4.  *

  5.  * This library is free software; you can redistribute it and/or

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

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

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  */

  19. 

  20. #include <limits.h>

  21.  

  22. #include "avformat.h"

  23. #include "avi.h"

  24. 

  25. #ifdef CONFIG_ZLIB

  26. #include <zlib.h>

  27. #endif

  28. 

  29. /*

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

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

  32.  *

  33.  * Features and limitations:

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

  35.  *   the exceptions are .mov with zlib compressed headers ('cmov' section). It shouldn't be hard to implement.

  36.  *   FIXED, Francois Revol, 07/17/2002

  37.  * - ffmpeg has nearly none of the usual QuickTime codecs,

  38.  *   although I succesfully dumped raw and mp3 audio tracks off .mov files.

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

  40.  * - .mp4 parsing is still hazardous, although the format really is QuickTime with some minor changes

  41.  *   (to make .mov parser crash maybe ?), despite what they say in the MPEG FAQ at

  42.  *   http://mpeg.telecomitalialab.com/faq.htm

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

  44.  * - seek is not supported with files that contain edit list

  45.  *

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

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

  48.  *

  49.  * Reference documents:

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

  51.  * Apple:

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

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

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

  55.  */

  56. 

  57. //#define DEBUG

  58. #ifdef DEBUG

  59. #include <stdio.h>

  60. #include <fcntl.h>

  61. #endif

  62. 

  63. #include "qtpalette.h"

  64. 

  65. 

  66. /* Allows seeking (MOV_SPLIT_CHUNKS should also be defined) */

  67. #define MOV_SEEK

  68. 

  69. /* allows chunk splitting - should work now... */

  70. /* in case you can't read a file, try commenting */

  71. #define MOV_SPLIT_CHUNKS

  72. 

  73. /* Special handling for movies created with Minolta Dimaxe Xi*/

  74. /* this fix should not interfere with other .mov files, but just in case*/

  75. #define MOV_MINOLTA_FIX

  76. 

  77. /* some streams in QT (and in MP4 mostly) aren't either video nor audio */

  78. /* so we first list them as this, then clean up the list of streams we give back, */

  79. /* getting rid of these */

  80. #define CODEC_TYPE_MOV_OTHER	(enum CodecType) 2

  81. 

  82. static const CodecTag mov_video_tags[] = {

  83. /*  { CODEC_ID_, MKTAG('c', 'v', 'i', 'd') }, *//* Cinepak */

  84. /*  { CODEC_ID_H263, MKTAG('r', 'a', 'w', ' ') }, *//* Uncompressed RGB */

  85. /*  { CODEC_ID_H263, MKTAG('Y', 'u', 'v', '2') }, *//* Uncompressed YUV422 */

  86. /*    { CODEC_ID_RAWVIDEO, MKTAG('A', 'V', 'U', 'I') }, *//* YUV with alpha-channel (AVID Uncompressed) */

  87. /* Graphics */

  88. /* Animation */

  89. /* Apple video */

  90. /* Kodak Photo CD */

  91.     { CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') }, /* PhotoJPEG */

  92.     { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'e', 'g') }, /* MPEG */

  93.     { CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'a') }, /* Motion-JPEG (format A) */

  94.     { CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'b') }, /* Motion-JPEG (format B) */

  95.     { CODEC_ID_MJPEG, MKTAG('A', 'V', 'D', 'J') }, /* MJPEG with alpha-channel (AVID JFIF meridien compressed) */

  96. /*    { CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') }, *//* MJPEG with alpha-channel (AVID ABVB/Truevision NuVista) */

  97. /*    { CODEC_ID_GIF, MKTAG('g', 'i', 'f', ' ') }, *//* embedded gif files as frames (usually one "click to play movie" frame) */

  98. /* Sorenson video */

  99.     { CODEC_ID_SVQ1, MKTAG('S', 'V', 'Q', '1') }, /* Sorenson Video v1 */

  100.     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') }, /* Sorenson Video v1 */

  101.     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', 'i') }, /* Sorenson Video v1 (from QT specs)*/

  102.     { CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') }, /* Sorenson Video v3 */

  103.     { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },

  104.     { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') }, /* OpenDiVX *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */

  105.     { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },

  106. /*    { CODEC_ID_, MKTAG('I', 'V', '5', '0') }, *//* Indeo 5.0 */

  107.     { CODEC_ID_H263, MKTAG('h', '2', '6', '3') }, /* H263 */

  108.     { CODEC_ID_H263, MKTAG('s', '2', '6', '3') }, /* H263 ?? works */

  109.     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') }, /* DV NTSC */

  110.     { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 'p') }, /* DV PAL */

  111. /*    { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, *//* AVID dv */

  112.     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, /* On2 VP3 */

  113.     { CODEC_ID_RPZA, MKTAG('r', 'p', 'z', 'a') }, /* Apple Video (RPZA) */

  114.     { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') }, /* Cinepak */

  115.     { CODEC_ID_8BPS, MKTAG('8', 'B', 'P', 'S') }, /* Planar RGB (8BPS) */

  116.     { CODEC_ID_SMC, MKTAG('s', 'm', 'c', ' ') }, /* Apple Graphics (SMC) */

  117.     { CODEC_ID_QTRLE, MKTAG('r', 'l', 'e', ' ') }, /* Apple Animation (RLE) */

  118.     { CODEC_ID_QDRAW, MKTAG('q', 'd', 'r', 'w') }, /* QuickDraw */

  119.     { CODEC_ID_NONE, 0 },

  120. };

  121. 

  122. static const CodecTag mov_audio_tags[] = {

  123. /*    { CODEC_ID_PCM_S16BE, MKTAG('N', 'O', 'N', 'E') }, *//* uncompressed */

  124.     { CODEC_ID_PCM_S16BE, MKTAG('t', 'w', 'o', 's') }, /* 16 bits */

  125.     /* { CODEC_ID_PCM_S8, MKTAG('t', 'w', 'o', 's') },*/ /* 8 bits */

  126.     { CODEC_ID_PCM_U8, MKTAG('r', 'a', 'w', ' ') }, /* 8 bits unsigned */

  127.     { CODEC_ID_PCM_S16LE, MKTAG('s', 'o', 'w', 't') }, /*  */

  128.     { CODEC_ID_PCM_MULAW, MKTAG('u', 'l', 'a', 'w') }, /*  */

  129.     { CODEC_ID_PCM_ALAW, MKTAG('a', 'l', 'a', 'w') }, /*  */

  130.     { CODEC_ID_ADPCM_IMA_QT, MKTAG('i', 'm', 'a', '4') }, /* IMA-4 ADPCM */

  131.     { CODEC_ID_MACE3, MKTAG('M', 'A', 'C', '3') }, /* Macintosh Audio Compression and Expansion 3:1 */

  132.     { CODEC_ID_MACE6, MKTAG('M', 'A', 'C', '6') }, /* Macintosh Audio Compression and Expansion 6:1 */

  133. 

  134.     { CODEC_ID_MP2, MKTAG('.', 'm', 'p', '3') }, /* MPEG layer 3 */ /* sample files at http://www.3ivx.com/showcase.html use this tag */

  135.     { CODEC_ID_MP2, 0x6D730055 }, /* MPEG layer 3 */

  136.     { CODEC_ID_MP2, 0x5500736D }, /* MPEG layer 3 *//* XXX: check endianness */

  137. /*    { CODEC_ID_OGG_VORBIS, MKTAG('O', 'g', 'g', 'S') }, *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */

  138. /* MP4 tags */

  139.     { CODEC_ID_MPEG4AAC, MKTAG('m', 'p', '4', 'a') }, /* MPEG-4 AAC */

  140.     /* The standard for mpeg4 audio is still not normalised AFAIK anyway */

  141.     { CODEC_ID_AMR_NB, MKTAG('s', 'a', 'm', 'r') }, /* AMR-NB 3gp */

  142.     { CODEC_ID_AMR_WB, MKTAG('s', 'a', 'w', 'b') }, /* AMR-WB 3gp */

  143.     { CODEC_ID_AC3, MKTAG('m', 's', 0x20, 0x00) }, /* Dolby AC-3 */

  144.     { CODEC_ID_NONE, 0 },

  145. };

  146. 

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

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

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

  150.  */

  151. 

  152. typedef struct MOV_sample_to_chunk_tbl {

  153.     long first;

  154.     long count;

  155.     long id;

  156. } MOV_sample_to_chunk_tbl;

  157. 

  158. typedef struct {

  159.     uint32_t type;

  160.     int64_t offset;

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

  162. } MOV_atom_t;

  163. 

  164. typedef struct {

  165.     int seed;

  166.     int flags;

  167.     int size;

  168.     void* clrs;

  169. } MOV_ctab_t;

  170. 

  171. typedef struct {

  172.     uint8_t  version;

  173.     uint32_t flags; // 24bit

  174. 

  175.     /* 0x03 ESDescrTag */

  176.     uint16_t es_id;

  177. #define MP4ODescrTag			0x01

  178. #define MP4IODescrTag			0x02

  179. #define MP4ESDescrTag			0x03

  180. #define MP4DecConfigDescrTag		0x04

  181. #define MP4DecSpecificDescrTag		0x05

  182. #define MP4SLConfigDescrTag		0x06

  183. #define MP4ContentIdDescrTag		0x07

  184. #define MP4SupplContentIdDescrTag	0x08

  185. #define MP4IPIPtrDescrTag		0x09

  186. #define MP4IPMPPtrDescrTag		0x0A

  187. #define MP4IPMPDescrTag			0x0B

  188. #define MP4RegistrationDescrTag		0x0D

  189. #define MP4ESIDIncDescrTag		0x0E

  190. #define MP4ESIDRefDescrTag		0x0F

  191. #define MP4FileIODescrTag		0x10

  192. #define MP4FileODescrTag		0x11

  193. #define MP4ExtProfileLevelDescrTag	0x13

  194. #define MP4ExtDescrTagsStart		0x80

  195. #define MP4ExtDescrTagsEnd		0xFE

  196.     uint8_t  stream_priority;

  197. 

  198.     /* 0x04 DecConfigDescrTag */

  199.     uint8_t  object_type_id;

  200.     uint8_t  stream_type;

  201.     /* XXX: really streamType is

  202.      * only 6bit, followed by:

  203.      * 1bit  upStream

  204.      * 1bit  reserved

  205.      */

  206.     uint32_t buffer_size_db; // 24

  207.     uint32_t max_bitrate;

  208.     uint32_t avg_bitrate;

  209. 

  210.     /* 0x05 DecSpecificDescrTag */

  211.     uint8_t  decoder_cfg_len;

  212.     uint8_t *decoder_cfg;

  213. 

  214.     /* 0x06 SLConfigDescrTag */

  215.     uint8_t  sl_config_len;

  216.     uint8_t *sl_config;

  217. } MOV_esds_t;

  218. 

  219. struct MOVParseTableEntry;

  220. 

  221. typedef struct MOVStreamContext {

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

  223.     int is_ff_stream; /* Is this stream presented to ffmpeg ? i.e. is this an audio or video stream ? */

  224.     long next_chunk;

  225.     long chunk_count;

  226.     int64_t *chunk_offsets;

  227.     int32_t stts_count;

  228.     uint64_t *stts_data;            /* concatenated data from the time-to-sample atom (count|duration) */

  229.     int32_t edit_count;             /* number of 'edit' (elst atom) */

  230.     long sample_to_chunk_sz;

  231.     MOV_sample_to_chunk_tbl *sample_to_chunk;

  232.     long sample_to_chunk_index;

  233.     long sample_size;

  234.     long sample_count;

  235.     long *sample_sizes;

  236.     long keyframe_count;

  237.     long *keyframes;

  238.     int time_scale;

  239.     long current_sample;

  240.     long left_in_chunk; /* how many samples before next chunk */

  241.     /* specific MPEG4 header which is added at the beginning of the stream */

  242.     unsigned int header_len;

  243.     uint8_t *header_data;

  244.     MOV_esds_t esds;

  245. } MOVStreamContext;

  246. 

  247. typedef struct MOVContext {

  248.     int mp4; /* set to 1 as soon as we are sure that the file is an .mp4 file (even some header parsing depends on this) */

  249.     AVFormatContext *fc;

  250.     int time_scale;

  251.     int duration; /* duration of the longest track */

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

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

  254.     int64_t mdat_size;

  255.     int64_t mdat_offset;

  256.     int total_streams;

  257.     /* some streams listed here aren't presented to the ffmpeg API, since they aren't either video nor audio

  258.      * but we need the info to be able to skip data from those streams in the 'mdat' section

  259.      */

  260.     MOVStreamContext *streams[MAX_STREAMS];

  261. 

  262.     int64_t next_chunk_offset;

  263.     MOVStreamContext *partial; /* != 0 : there is still to read in the current chunk */

  264.     int ctab_size;

  265.     MOV_ctab_t **ctab;           /* color tables */

  266.     const struct MOVParseTableEntry *parse_table; /* could be eventually used to change the table */

  267.     /* NOTE: for recursion save to/ restore from local variable! */

  268. 

  269.     AVPaletteControl palette_control;

  270. } MOVContext;

  271. 

  272. 

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

  274. 

  275. /* those functions parse an atom */

  276. /* return code:

  277.  1: found what I wanted, exit

  278.  0: continue to parse next atom

  279.  -1: error occured, exit

  280.  */

  281. typedef int (*mov_parse_function)(MOVContext *ctx, ByteIOContext *pb, MOV_atom_t atom);

  282. 

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

  284. typedef struct MOVParseTableEntry {

  285.     uint32_t type;

  286.     mov_parse_function func;

  287. } MOVParseTableEntry;

  288. 

  289. #ifdef DEBUG

  290. /*

  291.  * XXX: static sux, even more in a multithreaded environment...

  292.  * Avoid them. This is here just to help debugging.

  293.  */

  294. static int debug_indent = 0;

  295. void print_atom(const char *str, MOV_atom_t atom)

  296. {

  297.     unsigned int tag, i;

  298.     tag = (unsigned int) atom.type;

  299.     i=debug_indent;

  300.     if(tag == 0) tag = MKTAG('N', 'U', 'L', 'L');

  301.     while(i--)

  302.         av_log(NULL, AV_LOG_DEBUG, "|");

  303.     av_log(NULL, AV_LOG_DEBUG, "parse:");

  304.     av_log(NULL, AV_LOG_DEBUG, " %s: tag=%c%c%c%c offset=0x%x size=0x%x\n",

  305.            str, tag & 0xff,

  306.            (tag >> 8) & 0xff,

  307.            (tag >> 16) & 0xff,

  308.            (tag >> 24) & 0xff,

  309.            (unsigned int)atom.offset,

  310. 	   (unsigned int)atom.size);

  311.     assert((unsigned int)atom.size < 0x7fffffff);// catching errors

  312. }

  313. #else

  314. #define print_atom(a,b)

  315. #endif

  316. 

  317. 

  318. static int mov_read_leaf(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  319. {

  320.     print_atom("leaf", atom);

  321. 

  322.     if (atom.size>1)

  323.         url_fskip(pb, atom.size);

  324. /*        url_seek(pb, atom_offset+atom.size, SEEK_SET); */

  325.     return 0;

  326. }

  327. 

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

  329. {

  330.     int64_t total_size = 0;

  331.     MOV_atom_t a;

  332.     int i;

  333.     int err = 0;

  334. 

  335. #ifdef DEBUG

  336.     print_atom("default", atom);

  337.     debug_indent++;

  338. #endif

  339. 

  340.     a.offset = atom.offset;

  341. 

  342.     if (atom.size < 0)

  343. 	atom.size = 0x7fffffffffffffffLL;

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

  345. 	a.size = atom.size;

  346. 	a.type=0L;

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

  348. 	    a.size = get_be32(pb);

  349.             a.type = get_le32(pb);

  350.         }

  351. 	total_size += 8;

  352.         a.offset += 8;

  353. 	//av_log(NULL, AV_LOG_DEBUG, "type: %08x  %.4s  sz: %Lx  %Lx   %Lx\n", type, (char*)&type, size, atom.size, total_size);

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

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

  356.             a.offset += 8;

  357.             total_size += 8;

  358.         }

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

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

  361. 	    if (a.size <= 8)

  362.                 break;

  363. 	}

  364. 	for (i = 0; c->parse_table[i].type != 0L

  365. 	     && c->parse_table[i].type != a.type; i++)

  366. 	    /* empty */;

  367. 

  368. 	a.size -= 8;

  369. //        av_log(NULL, AV_LOG_DEBUG, " i=%ld\n", i);

  370. 	if (c->parse_table[i].type == 0) { /* skip leaf atoms data */

  371. //            url_seek(pb, atom.offset+atom.size, SEEK_SET);

  372. #ifdef DEBUG

  373.             print_atom("unknown", a);

  374. #endif

  375.             url_fskip(pb, a.size);

  376. 	} else {

  377. #ifdef DEBUG

  378. 	    //char b[5] = { type & 0xff, (type >> 8) & 0xff, (type >> 16) & 0xff, (type >> 24) & 0xff, 0 };

  379. 	    //print_atom(b, type, offset, size);

  380. #endif

  381. 	    err = (c->parse_table[i].func)(c, pb, a);

  382. 	}

  383. 

  384. 	a.offset += a.size;

  385.         total_size += a.size;

  386.     }

  387. 

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

  389. 	//av_log(NULL, AV_LOG_DEBUG, "RESET  %Ld  %Ld  err:%d\n", atom.size, total_size, err);

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

  391.     }

  392. 

  393. #ifdef DEBUG

  394.     debug_indent--;

  395. #endif

  396.     return err;

  397. }

  398. 

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

  400. {

  401.     unsigned int len;

  402.     MOV_ctab_t *t;

  403.     //url_fskip(pb, atom.size); // for now

  404.     c->ctab = av_realloc(c->ctab, ++c->ctab_size);

  405.     t = c->ctab[c->ctab_size];

  406.     t->seed = get_be32(pb);

  407.     t->flags = get_be16(pb);

  408.     t->size = get_be16(pb) + 1;

  409.     len = 2 * t->size * 4;

  410.     if (len > 0) {

  411. 	t->clrs = av_malloc(len); // 16bit A R G B

  412. 	if (t->clrs)

  413. 	    get_buffer(pb, t->clrs, len);

  414.     }

  415. 

  416.     return 0;

  417. }

  418. 

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

  420. {

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

  422.     int len = 0;

  423.     uint32_t type;

  424.     uint32_t ctype;

  425. 

  426.     print_atom("hdlr", atom);

  427. 

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

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

  430. 

  431.     /* component type */

  432.     ctype = get_le32(pb);

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

  434. 

  435. #ifdef DEBUG

  436.     av_log(NULL, AV_LOG_DEBUG, "ctype= %c%c%c%c (0x%08lx)\n", *((char *)&ctype), ((char *)&ctype)[1], ((char *)&ctype)[2], ((char *)&ctype)[3], (long) ctype);

  437.     av_log(NULL, AV_LOG_DEBUG, "stype= %c%c%c%c\n", *((char *)&type), ((char *)&type)[1], ((char *)&type)[2], ((char *)&type)[3]);

  438. #endif

  439. #ifdef DEBUG

  440. /* XXX: yeah this is ugly... */

  441.     if(ctype == MKTAG('m', 'h', 'l', 'r')) { /* MOV */

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

  443.             puts("hdlr: vide");

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

  445.             puts("hdlr: soun");

  446.     } else if(ctype == 0) { /* MP4 */

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

  448.             puts("hdlr: vide");

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

  450.             puts("hdlr: soun");

  451.         else if(type == MKTAG('o', 'd', 's', 'm'))

  452.             puts("hdlr: odsm");

  453.         else if(type == MKTAG('s', 'd', 's', 'm'))

  454.             puts("hdlr: sdsm");

  455.     } else puts("hdlr: meta");

  456. #endif

  457. 

  458.     if(ctype == MKTAG('m', 'h', 'l', 'r')) { /* MOV */

  459.         /* helps parsing the string hereafter... */

  460.         c->mp4 = 0;

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

  462.             st->codec.codec_type = CODEC_TYPE_VIDEO;

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

  464.             st->codec.codec_type = CODEC_TYPE_AUDIO;

  465.     } else if(ctype == 0) { /* MP4 */

  466.         /* helps parsing the string hereafter... */

  467.         c->mp4 = 1;

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

  469.             st->codec.codec_type = CODEC_TYPE_VIDEO;

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

  471.             st->codec.codec_type = CODEC_TYPE_AUDIO;

  472.     }

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

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

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

  476. 

  477.     if(atom.size <= 24)

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

  479.     /* XXX: MP4 uses a C string, not a pascal one */

  480.     /* component name */

  481. 

  482.     if(c->mp4) {

  483.         /* .mp4: C string */

  484.         while(get_byte(pb) && (++len < (atom.size - 24)));

  485.     } else {

  486.         /* .mov: PASCAL string */

  487. #ifdef DEBUG

  488.         char* buf;

  489. #endif

  490.         len = get_byte(pb);

  491. #ifdef DEBUG

  492. 	buf = (uint8_t*) av_malloc(len+1);

  493. 	if (buf) {

  494. 	    get_buffer(pb, buf, len);

  495. 	    buf[len] = '\0';

  496. 	    av_log(NULL, AV_LOG_DEBUG, "**buf='%s'\n", buf);

  497. 	    av_free(buf);

  498. 	} else

  499. #endif

  500. 	    url_fskip(pb, len);

  501.     }

  502. 

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

  504.     return 0;

  505. }

  506. 

  507. static int mov_mp4_read_descr_len(ByteIOContext *pb)

  508. {

  509.     int len = 0;

  510.     int count = 4;

  511.     while (count--) {

  512.         int c = get_byte(pb);

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

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

  515. 	    break;

  516.     }

  517.     return len;

  518. }

  519. 

  520. static int mov_mp4_read_descr(ByteIOContext *pb, int *tag)

  521. {

  522.     int len;

  523.     *tag = get_byte(pb);

  524.     len = mov_mp4_read_descr_len(pb);

  525. #ifdef DEBUG

  526.     av_log(NULL, AV_LOG_DEBUG, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len);

  527. #endif

  528.     return len;

  529. }

  530. 

  531. static inline unsigned int get_be24(ByteIOContext *s)

  532. {

  533.     unsigned int val;

  534.     val = get_byte(s) << 16;

  535.     val |= get_byte(s) << 8;

  536.     val |= get_byte(s);

  537.     return val;

  538. }

  539. 

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

  541. {

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

  543.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  544.     int64_t start_pos = url_ftell(pb);

  545.     int tag, len;

  546. 

  547.     print_atom("esds", atom);

  548. 

  549.     /* Well, broken but suffisant for some MP4 streams */

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

  551.     len = mov_mp4_read_descr(pb, &tag);

  552.     if (tag == MP4ESDescrTag) {

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

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

  555.     } else

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

  557. 

  558.     len = mov_mp4_read_descr(pb, &tag);

  559.     if (tag == MP4DecConfigDescrTag) {

  560. 	sc->esds.object_type_id = get_byte(pb);

  561. 	sc->esds.stream_type = get_byte(pb);

  562. 	sc->esds.buffer_size_db = get_be24(pb);

  563. 	sc->esds.max_bitrate = get_be32(pb);

  564. 	sc->esds.avg_bitrate = get_be32(pb);

  565. 

  566. 	len = mov_mp4_read_descr(pb, &tag);

  567. 	//av_log(NULL, AV_LOG_DEBUG, "LEN %d  TAG %d  m:%d a:%d\n", len, tag, sc->esds.max_bitrate, sc->esds.avg_bitrate);

  568. 	if (tag == MP4DecSpecificDescrTag) {

  569. #ifdef DEBUG

  570. 	    av_log(NULL, AV_LOG_DEBUG, "Specific MPEG4 header len=%d\n", len);

  571. #endif

  572. 	    st->codec.extradata = (uint8_t*) av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);

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

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

  575. 		st->codec.extradata_size = len;

  576. 	    }

  577. 	}

  578.     }

  579.     /* in any case, skip garbage */

  580.     url_fskip(pb, atom.size - ((url_ftell(pb) - start_pos)));

  581.     return 0;

  582. }

  583. 

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

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

  586. {

  587.     print_atom("mdat", atom);

  588. 

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

  590.         return 0;

  591.     c->found_mdat=1;

  592.     c->mdat_offset = atom.offset;

  593.     c->mdat_size = atom.size;

  594.     if(c->found_moov)

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

  596.     url_fskip(pb, atom.size);

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

  598. }

  599. 

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

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

  602. {

  603.     int err;

  604. 

  605.     print_atom("moov", atom);

  606. 

  607.     err = mov_read_default(c, pb, atom);

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

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

  610.     c->found_moov=1;

  611.     if(c->found_mdat)

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

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

  614. }

  615. 

  616. 

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

  618. {

  619.     print_atom("mdhd", atom);

  620. 

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

  622. 

  623.     get_byte(pb); get_byte(pb);

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

  625. 

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

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

  628. 

  629.     c->streams[c->fc->nb_streams-1]->time_scale = get_be32(pb);

  630. 

  631. #ifdef DEBUG

  632.     av_log(NULL, AV_LOG_DEBUG, "track[%i].time_scale = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->time_scale); /* time scale */

  633. #endif

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

  635. 

  636.     get_be16(pb); /* language */

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

  638. 

  639.     return 0;

  640. }

  641. 

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

  643. {

  644.     print_atom("mvhd", atom);

  645. 

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

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

  648. 

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

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

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

  652. #ifdef DEBUG

  653.     av_log(NULL, AV_LOG_DEBUG, "time scale = %i\n", c->time_scale);

  654. #endif

  655.     c->duration = get_be32(pb); /* duration */

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

  657. 

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

  659. 

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

  661. 

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

  663. 

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

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

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

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

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

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

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

  671. 

  672.     return 0;

  673. }

  674. 

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

  676. {

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

  678. 

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

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

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

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

  683.     st->codec.extradata = (uint8_t*) av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  684. 

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

  686. 	strcpy(st->codec.extradata, "SVQ3"); // fake

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

  688. 	//av_log(NULL, AV_LOG_DEBUG, "Reading SMI %Ld  %s\n", atom.size, (char*)st->codec.extradata + 0x5a);

  689.     } else

  690. 	url_fskip(pb, atom.size);

  691. 

  692.     return 0;

  693. }

  694. 

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

  696. {

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

  698.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  699.     int entries, i;

  700. 

  701.     print_atom("stco", atom);

  702. 

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

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

  705. 

  706.     entries = get_be32(pb);

  707.     sc->chunk_count = entries;

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

  709.     if (!sc->chunk_offsets)

  710.         return -1;

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

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

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

  714.         }

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

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

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

  718.         }

  719.     } else

  720.         return -1;

  721. #ifdef DEBUG

  722. /*

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

  724.         av_log(NULL, AV_LOG_DEBUG, "chunk offset=0x%Lx\n", sc->chunk_offsets[i]);

  725.     }

  726. */

  727. #endif

  728.     return 0;

  729. }

  730. 

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

  732. {

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

  734.     //MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  735.     int entries, frames_per_sample;

  736.     uint32_t format;

  737. 

  738.     /* for palette traversal */

  739.     int color_depth;

  740.     int color_start;

  741.     int color_count;

  742.     int color_end;

  743.     int color_index;

  744.     int color_dec;

  745.     int color_greyscale;

  746.     unsigned char *color_table;

  747.     int j;

  748.     unsigned char r, g, b;

  749. 

  750.     print_atom("stsd", atom);

  751. 

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

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

  754. 

  755.     entries = get_be32(pb);

  756. 

  757.     while(entries--) { //Parsing Sample description table

  758.         enum CodecID id;

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

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

  761. 

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

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

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

  765. 

  766.         /* for MPEG4: set codec type by looking for it */

  767.         id = codec_get_id(mov_video_tags, format);

  768.         if (id >= 0) {

  769.             AVCodec *codec;

  770. 	    codec = avcodec_find_decoder(id);

  771.             if (codec)

  772. 		st->codec.codec_type = codec->type;

  773.         }

  774. #ifdef DEBUG

  775.         av_log(NULL, AV_LOG_DEBUG, "size=%d 4CC= %c%c%c%c codec_type=%d\n",

  776.                size,

  777.                (format >> 0) & 0xff,

  778.                (format >> 8) & 0xff,

  779.                (format >> 16) & 0xff,

  780.                (format >> 24) & 0xff,

  781.                st->codec.codec_type);

  782. #endif

  783. 	st->codec.codec_tag = format;

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

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

  786.             st->codec.codec_id = id;

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

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

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

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

  791.             get_be32(pb); /* spacial quality */

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

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

  794. #if 1

  795.             if (st->codec.codec_id == CODEC_ID_MPEG4) {

  796.                 /* in some MPEG4 the width/height are not correct, so

  797.                    we ignore this info */

  798.                 st->codec.width = 0;

  799.                 st->codec.height = 0;

  800.             }

  801. #endif

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

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

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

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

  806. #ifdef DEBUG

  807. 	    av_log(NULL, AV_LOG_DEBUG, "frames/samples = %d\n", frames_per_sample);

  808. #endif

  809. 	    get_buffer(pb, (uint8_t *)st->codec.codec_name, 32); /* codec name */

  810. 

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

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

  813. 

  814. /*          These are set in mov_read_stts and might already be set!

  815.             st->codec.frame_rate      = 25;

  816.             st->codec.frame_rate_base = 1;

  817. */

  818. 	    size -= (16+8*4+2+32+2*2);

  819. #if 0

  820. 	    while (size >= 8) {

  821. 		MOV_atom_t a;

  822.                 int64_t start_pos;

  823. 

  824. 		a.size = get_be32(pb);

  825. 		a.type = get_le32(pb);

  826. 		size -= 8;

  827. #ifdef DEBUG

  828.                 av_log(NULL, AV_LOG_DEBUG, "VIDEO: atom_type=%c%c%c%c atom.size=%Ld size_left=%d\n",

  829.                        (a.type >> 0) & 0xff,

  830.                        (a.type >> 8) & 0xff,

  831.                        (a.type >> 16) & 0xff,

  832.                        (a.type >> 24) & 0xff,

  833. 		       a.size, size);

  834. #endif

  835.                 start_pos = url_ftell(pb);

  836. 

  837. 		switch(a.type) {

  838.                 case MKTAG('e', 's', 'd', 's'):

  839.                     {

  840.                         int tag, len;

  841.                         /* Well, broken but suffisant for some MP4 streams */

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

  843. 			len = mov_mp4_read_descr(pb, &tag);

  844.                         if (tag == 0x03) {

  845.                             /* MP4ESDescrTag */

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

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

  848. 			    len = mov_mp4_read_descr(pb, &tag);

  849.                             if (tag != 0x04)

  850.                                 goto fail;

  851.                             /* MP4DecConfigDescrTag */

  852.                             get_byte(pb); /* objectTypeId */

  853.                             get_be32(pb); /* streamType + buffer size */

  854. 			    get_be32(pb); /* max bit rate */

  855.                             get_be32(pb); /* avg bit rate */

  856.                             len = mov_mp4_read_descr(pb, &tag);

  857.                             if (tag != 0x05)

  858.                                 goto fail;

  859.                             /* MP4DecSpecificDescrTag */

  860. #ifdef DEBUG

  861.                             av_log(NULL, AV_LOG_DEBUG, "Specific MPEG4 header len=%d\n", len);

  862. #endif

  863.                             sc->header_data = av_mallocz(len);

  864.                             if (sc->header_data) {

  865.                                 get_buffer(pb, sc->header_data, len);

  866. 				sc->header_len = len;

  867.                             }

  868.                         }

  869.                         /* in any case, skip garbage */

  870.                     }

  871.                     break;

  872.                 default:

  873.                     break;

  874.                 }

  875. 	    fail:

  876. 		av_log(NULL, AV_LOG_DEBUG, "ATOMENEWSIZE %Ld   %d\n", atom.size, url_ftell(pb) - start_pos);

  877. 		if (atom.size > 8) {

  878. 		    url_fskip(pb, (atom.size - 8) -

  879. 			      ((url_ftell(pb) - start_pos)));

  880. 		    size -= atom.size - 8;

  881. 		}

  882. 	    }

  883.             if (size > 0) {

  884.                 /* unknown extension */

  885.                 url_fskip(pb, size);

  886.             }

  887. #else

  888. 

  889.             /* figure out the palette situation */

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

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

  892. 

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

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

  895.                 (color_depth == 8)) {

  896. 

  897.                 if (color_greyscale) {

  898. 

  899.                     /* compute the greyscale palette */

  900.                     color_count = 1 << color_depth;

  901.                     color_index = 255;

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

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

  904.                         r = g = b = color_index;

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

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

  907.                         color_index -= color_dec;

  908.                         if (color_index < 0)

  909.                             color_index = 0;

  910.                     }

  911. 

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

  913. 

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

  915.                     color_count = 1 << color_depth;

  916.                     if (color_depth == 2)

  917.                         color_table = ff_qt_default_palette_4;

  918.                     else if (color_depth == 4)

  919.                         color_table = ff_qt_default_palette_16;

  920.                     else

  921.                         color_table = ff_qt_default_palette_256;

  922. 

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

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

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

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

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

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

  929.                     }

  930. 

  931.                 } else {

  932. 

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

  934.                     color_start = get_be32(pb);

  935.                     color_count = get_be16(pb);

  936.                     color_end = get_be16(pb);

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

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

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

  940.                          * up front */

  941.                         get_byte(pb);

  942.                         get_byte(pb);

  943.                         r = get_byte(pb);

  944.                         get_byte(pb);

  945.                         g = get_byte(pb);

  946.                         get_byte(pb);

  947.                         b = get_byte(pb);

  948.                         get_byte(pb);

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

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

  951.                     }

  952.                 }

  953. 

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

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

  956.             } else

  957.                 st->codec.palctrl = NULL;

  958. 

  959.             a.size = size;

  960. 	    mov_read_default(c, pb, a);

  961. #endif

  962. 	} else {

  963.             st->codec.codec_id = codec_get_id(mov_audio_tags, format);

  964. 	    if(st->codec.codec_id==CODEC_ID_AMR_NB || st->codec.codec_id==CODEC_ID_AMR_WB) //from TS26.244

  965. 	    {

  966. #ifdef DEBUG

  967.                av_log(NULL, AV_LOG_DEBUG, "AMR-NB or AMR-WB audio identified!!\n");

  968. #endif

  969.                get_be32(pb);get_be32(pb); //Reserved_8

  970.                get_be16(pb);//Reserved_2

  971.                get_be16(pb);//Reserved_2

  972.                get_be32(pb);//Reserved_4

  973.                get_be16(pb);//TimeScale

  974.                get_be16(pb);//Reserved_2

  975. 

  976.                 //AMRSpecificBox.(10 bytes)

  977.                

  978.                get_be32(pb); //size

  979.                get_be32(pb); //type=='damr'

  980.                get_be32(pb); //vendor

  981.                get_byte(pb); //decoder version

  982.                get_be16(pb); //mode_set

  983.                get_byte(pb); //mode_change_period

  984.                get_byte(pb); //frames_per_sample

  985. 

  986.                st->duration = AV_NOPTS_VALUE;//Not possible to get from this info, must count number of AMR frames

  987.                if(st->codec.codec_id==CODEC_ID_AMR_NB)

  988.                {

  989.                    st->codec.sample_rate=8000;

  990.                    st->codec.channels=1;

  991.                }

  992.                else //AMR-WB

  993.                {

  994.                    st->codec.sample_rate=16000;

  995.                    st->codec.channels=1;

  996.                }

  997.                st->codec.bits_per_sample=16;

  998.                st->codec.bit_rate=0; /*It is not possible to tell this before we have 

  999.                                        an audio frame and even then every frame can be different*/

  1000. 	    }

  1001.             else if( st->codec.codec_tag == MKTAG( 'm', 'p', '4', 's' ))

  1002.             {

  1003.                 //This is some stuff for the hint track, lets ignore it!

  1004.                 //Do some mp4 auto detect.

  1005.                 c->mp4=1;

  1006.                 size-=(16);

  1007.                 url_fskip(pb, size); /* The mp4s atom also contians a esds atom that we can skip*/

  1008.             }

  1009.             else if( st->codec.codec_tag == MKTAG( 'm', 'p', '4', 'a' ))

  1010.             {

  1011.                 /* Handle mp4 audio tag */

  1012.                 get_be32(pb); /* version */

  1013.                 get_be32(pb);

  1014.                 st->codec.channels = get_be16(pb); /* channels */

  1015.                 st->codec.bits_per_sample = get_be16(pb); /* bits per sample */

  1016.                 get_be32(pb);

  1017.                 st->codec.sample_rate = get_be16(pb); /* sample rate, not always correct */

  1018.                 get_be16(pb);

  1019.                 c->mp4=1;

  1020. 		{

  1021.                 MOV_atom_t a = { format, url_ftell(pb), size - (20 + 20 + 8) };

  1022.                 mov_read_default(c, pb, a);

  1023. 		}

  1024.                 /* Get correct sample rate from extradata */

  1025.                 if(st->codec.extradata_size) {

  1026.                    const int samplerate_table[] = {

  1027.                      96000, 88200, 64000, 48000, 44100, 32000, 

  1028.                      24000, 22050, 16000, 12000, 11025, 8000,

  1029.                      7350, 0, 0, 0

  1030.                    };

  1031.                    unsigned char *px = st->codec.extradata;

  1032.                    // 5 bits objectTypeIndex, 4 bits sampleRateIndex, 4 bits channels

  1033.                    int samplerate_index = ((px[0] & 7) << 1) + ((px[1] >> 7) & 1);

  1034.                    st->codec.sample_rate = samplerate_table[samplerate_index];

  1035.                 }

  1036.             }

  1037. 	    else if(size>=(16+20))

  1038. 	    {//16 bytes read, reading atleast 20 more

  1039. #ifdef DEBUG

  1040.                 av_log(NULL, AV_LOG_DEBUG, "audio size=0x%X\n",size);

  1041. #endif

  1042.                 uint16_t version = get_be16(pb); /* version */

  1043.                 get_be16(pb); /* revision level */

  1044.                 get_be32(pb); /* vendor */

  1045. 

  1046.                 st->codec.channels = get_be16(pb);		/* channel count */

  1047. 	        st->codec.bits_per_sample = get_be16(pb);	/* sample size */

  1048. 

  1049.                 /* handle specific s8 codec */

  1050.                 get_be16(pb); /* compression id = 0*/

  1051.                 get_be16(pb); /* packet size = 0 */

  1052. 

  1053.                 st->codec.sample_rate = ((get_be32(pb) >> 16));

  1054. 	        //av_log(NULL, AV_LOG_DEBUG, "CODECID %d  %d  %.4s\n", st->codec.codec_id, CODEC_ID_PCM_S16BE, (char*)&format);

  1055. 

  1056. 	        switch (st->codec.codec_id) {

  1057. 	        case CODEC_ID_PCM_S16BE:

  1058. 		    if (st->codec.bits_per_sample == 8)

  1059. 		        st->codec.codec_id = CODEC_ID_PCM_S8;

  1060.                     /* fall */

  1061. 	        case CODEC_ID_PCM_U8:

  1062. 		    st->codec.bit_rate = st->codec.sample_rate * 8;

  1063. 		    break;

  1064. 	        default:

  1065.                     ;

  1066. 	        }

  1067. 

  1068.                 //Read QT version 1 fields. In version 0 theese dont exist

  1069. #ifdef DEBUG

  1070.                 av_log(NULL, AV_LOG_DEBUG, "version =%d mp4=%d\n",version,c->mp4);

  1071.                 av_log(NULL, AV_LOG_DEBUG, "size-(16+20+16)=%d\n",size-(16+20+16));

  1072. #endif

  1073.                 if((version==1) && size>=(16+20+16))

  1074.                 {

  1075.                     get_be32(pb); /* samples per packet */

  1076.                     get_be32(pb); /* bytes per packet */

  1077.                     get_be32(pb); /* bytes per frame */

  1078.                     get_be32(pb); /* bytes per sample */

  1079.                     if(size>(16+20+16))

  1080.                     {

  1081.                         //Optional, additional atom-based fields

  1082. #ifdef DEBUG

  1083.                         av_log(NULL, AV_LOG_DEBUG, "offest=0x%X, sizeleft=%d=0x%x,format=%c%c%c%c\n",(int)url_ftell(pb),size - (16 + 20 + 16 ),size - (16 + 20 + 16 ),

  1084.                             (format >> 0) & 0xff,

  1085.                             (format >> 8) & 0xff,

  1086.                             (format >> 16) & 0xff,

  1087.                             (format >> 24) & 0xff);

  1088. #endif

  1089.                         MOV_atom_t a = { format, url_ftell(pb), size - (16 + 20 + 16 + 8) };

  1090.                         mov_read_default(c, pb, a);

  1091.                     }

  1092.                 }

  1093.                 else

  1094.                 {

  1095.                     //We should be down to 0 bytes here, but lets make sure.

  1096.                     size-=(16+20);

  1097. #ifdef DEBUG

  1098.                     if(size>0)

  1099.                         av_log(NULL, AV_LOG_DEBUG, "skipping 0x%X bytes\n",size-(16+20));

  1100. #endif

  1101.                     url_fskip(pb, size);

  1102.                 }

  1103.             }

  1104.             else

  1105.             {

  1106.                 size-=16;

  1107.                 //Unknown size, but lets do our best and skip the rest.

  1108. #ifdef DEBUG

  1109.                 av_log(NULL, AV_LOG_DEBUG, "Strange size, skipping 0x%X bytes\n",size);

  1110. #endif

  1111.                 url_fskip(pb, size);

  1112.             }

  1113.         }

  1114.     }

  1115. 

  1116.     return 0;

  1117. }

  1118. 

  1119. static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1120. {

  1121.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1122.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1123.     int entries, i;

  1124. 

  1125.     print_atom("stsc", atom);

  1126. 

  1127.     get_byte(pb); /* version */

  1128.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1129. 

  1130.     entries = get_be32(pb);

  1131. #ifdef DEBUG

  1132. av_log(NULL, AV_LOG_DEBUG, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1133. #endif

  1134.     sc->sample_to_chunk_sz = entries;

  1135.     sc->sample_to_chunk = (MOV_sample_to_chunk_tbl*) av_malloc(entries * sizeof(MOV_sample_to_chunk_tbl));

  1136.     if (!sc->sample_to_chunk)

  1137.         return -1;

  1138.     for(i=0; i<entries; i++) {

  1139.         sc->sample_to_chunk[i].first = get_be32(pb);

  1140.         sc->sample_to_chunk[i].count = get_be32(pb);

  1141.         sc->sample_to_chunk[i].id = get_be32(pb);

  1142. #ifdef DEBUG

  1143. /*        av_log(NULL, AV_LOG_DEBUG, "sample_to_chunk first=%ld count=%ld, id=%ld\n", sc->sample_to_chunk[i].first, sc->sample_to_chunk[i].count, sc->sample_to_chunk[i].id); */

  1144. #endif

  1145.     }

  1146.     return 0;

  1147. }

  1148. 

  1149. static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1150. {

  1151.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1152.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1153.     int entries, i;

  1154. 

  1155.     print_atom("stss", atom);

  1156. 

  1157.     get_byte(pb); /* version */

  1158.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1159. 

  1160.     entries = get_be32(pb);

  1161.     sc->keyframe_count = entries;

  1162. #ifdef DEBUG

  1163.     av_log(NULL, AV_LOG_DEBUG, "keyframe_count = %ld\n", sc->keyframe_count);

  1164. #endif

  1165.     sc->keyframes = (long*) av_malloc(entries * sizeof(long));

  1166.     if (!sc->keyframes)

  1167.         return -1;

  1168.     for(i=0; i<entries; i++) {

  1169.         sc->keyframes[i] = get_be32(pb);

  1170. #ifdef DEBUG

  1171. /*        av_log(NULL, AV_LOG_DEBUG, "keyframes[]=%ld\n", sc->keyframes[i]); */

  1172. #endif

  1173.     }

  1174.     return 0;

  1175. }

  1176. 

  1177. static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1178. {

  1179.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1180.     MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1181.     int entries, i;

  1182. 

  1183.     print_atom("stsz", atom);

  1184. 

  1185.     get_byte(pb); /* version */

  1186.     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1187. 

  1188.     sc->sample_size = get_be32(pb);

  1189.     entries = get_be32(pb);

  1190.     sc->sample_count = entries;

  1191. #ifdef DEBUG

  1192.     av_log(NULL, AV_LOG_DEBUG, "sample_size = %ld sample_count = %ld\n", sc->sample_size, sc->sample_count);

  1193. #endif

  1194.     if(sc->sample_size)

  1195.         return 0; /* there isn't any table following */

  1196.     sc->sample_sizes = (long*) av_malloc(entries * sizeof(long));

  1197.     if (!sc->sample_sizes)

  1198.         return -1;

  1199.     for(i=0; i<entries; i++) {

  1200.         sc->sample_sizes[i] = get_be32(pb);

  1201. #ifdef DEBUG

  1202. /*        av_log(NULL, AV_LOG_DEBUG, "sample_sizes[]=%ld\n", sc->sample_sizes[i]); */

  1203. #endif

  1204.     }

  1205.     return 0;

  1206. }

  1207. 

  1208. static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1209. {

  1210.     AVStream *st = c->fc->streams[c->fc->nb_streams-1];

  1211.     //MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;

  1212.     int entries, i;

  1213.     int64_t duration=0;

  1214.     int64_t total_sample_count=0;

  1215. 

  1216.     print_atom("stts", atom);

  1217. 

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

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

  1220.     entries = get_be32(pb);

  1221. 

  1222.     c->streams[c->fc->nb_streams-1]->stts_count = entries;

  1223.     c->streams[c->fc->nb_streams-1]->stts_data = (uint64_t*) av_malloc(entries * sizeof(uint64_t));

  1224. 

  1225. #ifdef DEBUG

  1226. av_log(NULL, AV_LOG_DEBUG, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);

  1227. #endif

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

  1229.         int32_t sample_duration;

  1230.         int32_t sample_count;

  1231. 

  1232.         sample_count=get_be32(pb);

  1233.         sample_duration = get_be32(pb);

  1234.         c->streams[c->fc->nb_streams - 1]->stts_data[i] = (uint64_t)sample_count<<32 | (uint64_t)sample_duration;

  1235. #ifdef DEBUG

  1236.         av_log(NULL, AV_LOG_DEBUG, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);

  1237. #endif

  1238.         duration+=sample_duration*sample_count;

  1239.         total_sample_count+=sample_count;

  1240. 

  1241. #if 0 //We calculate an average instead, needed by .mp4-files created with nec e606 3g phone

  1242. 

  1243.         if (!i && st->codec.codec_type==CODEC_TYPE_VIDEO) {

  1244.             st->codec.frame_rate_base = sample_duration ? sample_duration : 1;

  1245.             st->codec.frame_rate = c->streams[c->fc->nb_streams-1]->time_scale;

  1246. #ifdef DEBUG

  1247.             av_log(NULL, AV_LOG_DEBUG, "VIDEO FRAME RATE= %i (sd= %i)\n", st->codec.frame_rate, sample_duration);

  1248. #endif

  1249.         }

  1250. #endif

  1251.     }

  1252. 

  1253.     /*The stsd atom which contain codec type sometimes comes after the stts so we cannot check for codec_type*/

  1254.     if(duration>0)

  1255.     {

  1256.         av_reduce(

  1257.             &st->codec.frame_rate, 

  1258.             &st->codec.frame_rate_base, 

  1259.             c->streams[c->fc->nb_streams-1]->time_scale * total_sample_count,

  1260.             duration,

  1261.             INT_MAX

  1262.         );

  1263. 

  1264. #ifdef DEBUG

  1265.         av_log(NULL, AV_LOG_DEBUG, "FRAME RATE average (video or audio)= %f (tot sample count= %i ,tot dur= %i timescale=%d)\n", (float)st->codec.frame_rate/st->codec.frame_rate_base,total_sample_count,duration,c->streams[c->fc->nb_streams-1]->time_scale);

  1266. #endif

  1267.     }

  1268.     else

  1269.     {

  1270.         st->codec.frame_rate_base = 1;

  1271.         st->codec.frame_rate = c->streams[c->fc->nb_streams-1]->time_scale;

  1272.     }

  1273.     return 0;

  1274. }

  1275. 

  1276. static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1277. {

  1278.     AVStream *st;

  1279.     MOVStreamContext *sc;

  1280. 

  1281.     print_atom("trak", atom);

  1282. 

  1283.     st = av_new_stream(c->fc, c->fc->nb_streams);

  1284.     if (!st) return -2;

  1285.     sc = (MOVStreamContext*) av_mallocz(sizeof(MOVStreamContext));

  1286.     if (!sc) {

  1287. 	av_free(st);

  1288.         return -1;

  1289.     }

  1290. 

  1291.     sc->sample_to_chunk_index = -1;

  1292.     st->priv_data = sc;

  1293.     st->codec.codec_type = CODEC_TYPE_MOV_OTHER;

  1294.     st->start_time = 0; /* XXX: check */

  1295.     st->duration = (c->duration * (int64_t)AV_TIME_BASE) / c->time_scale;

  1296.     c->streams[c->fc->nb_streams-1] = sc;

  1297. 

  1298.     return mov_read_default(c, pb, atom);

  1299. }

  1300. 

  1301. static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1302. {

  1303.     AVStream *st;

  1304. 

  1305.     print_atom("tkhd", atom);

  1306. 

  1307.     st = c->fc->streams[c->fc->nb_streams-1];

  1308. 

  1309.     get_byte(pb); /* version */

  1310. 

  1311.     get_byte(pb); get_byte(pb);

  1312.     get_byte(pb); /* flags */

  1313.     /*

  1314.     MOV_TRACK_ENABLED 0x0001

  1315.     MOV_TRACK_IN_MOVIE 0x0002

  1316.     MOV_TRACK_IN_PREVIEW 0x0004

  1317.     MOV_TRACK_IN_POSTER 0x0008

  1318.     */

  1319. 

  1320.     get_be32(pb); /* creation time */

  1321.     get_be32(pb); /* modification time */

  1322.     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/

  1323.     get_be32(pb); /* reserved */

  1324.     st->start_time = 0; /* check */

  1325.     st->duration = (get_be32(pb) * (int64_t)AV_TIME_BASE) / c->time_scale; /* duration */

  1326.     get_be32(pb); /* reserved */

  1327.     get_be32(pb); /* reserved */

  1328. 

  1329.     get_be16(pb); /* layer */

  1330.     get_be16(pb); /* alternate group */

  1331.     get_be16(pb); /* volume */

  1332.     get_be16(pb); /* reserved */

  1333. 

  1334.     url_fskip(pb, 36); /* display matrix */

  1335. 

  1336.     /* those are fixed-point */

  1337.     st->codec.width = get_be32(pb) >> 16; /* track width */

  1338.     st->codec.height = get_be32(pb) >> 16; /* track height */

  1339. 

  1340.     return 0;

  1341. }

  1342. 

  1343. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  1344. /* like the files created with Adobe Premiere 5.0, for samples see */

  1345. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  1346. static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1347. {

  1348.     int err;

  1349. 

  1350. #ifdef DEBUG

  1351.     print_atom("wide", atom);

  1352.     debug_indent++;

  1353. #endif

  1354.     if (atom.size < 8)

  1355.         return 0; /* continue */

  1356.     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  1357.         url_fskip(pb, atom.size - 4);

  1358.         return 0;

  1359.     }

  1360.     atom.type = get_le32(pb);

  1361.     atom.offset += 8;

  1362.     atom.size -= 8;

  1363.     if (atom.type != MKTAG('m', 'd', 'a', 't')) {

  1364.         url_fskip(pb, atom.size);

  1365.         return 0;

  1366.     }

  1367.     err = mov_read_mdat(c, pb, atom);

  1368. #ifdef DEBUG

  1369.     debug_indent--;

  1370. #endif

  1371.     return err;

  1372. }

  1373. 

  1374. 

  1375. #ifdef CONFIG_ZLIB

  1376. static int null_read_packet(void *opaque, uint8_t *buf, int buf_size)

  1377. {

  1378.     return -1;

  1379. }

  1380. 

  1381. static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1382. {

  1383.     ByteIOContext ctx;

  1384.     uint8_t *cmov_data;

  1385.     uint8_t *moov_data; /* uncompressed data */

  1386.     long cmov_len, moov_len;

  1387.     int ret;

  1388. 

  1389.     print_atom("cmov", atom);

  1390. 

  1391.     get_be32(pb); /* dcom atom */

  1392.     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))

  1393.         return -1;

  1394.     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {

  1395.         av_log(NULL, AV_LOG_DEBUG, "unknown compression for cmov atom !");

  1396.         return -1;

  1397.     }

  1398.     get_be32(pb); /* cmvd atom */

  1399.     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))

  1400.         return -1;

  1401.     moov_len = get_be32(pb); /* uncompressed size */

  1402.     cmov_len = atom.size - 6 * 4;

  1403. 

  1404.     cmov_data = (uint8_t *) av_malloc(cmov_len);

  1405.     if (!cmov_data)

  1406.         return -1;

  1407.     moov_data = (uint8_t *) av_malloc(moov_len);

  1408.     if (!moov_data) {

  1409.         av_free(cmov_data);

  1410.         return -1;

  1411.     }

  1412.     get_buffer(pb, cmov_data, cmov_len);

  1413.     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  1414.         return -1;

  1415.     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, null_read_packet, NULL, NULL) != 0)

  1416.         return -1;

  1417.     ctx.buf_end = ctx.buffer + moov_len;

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

  1419.     atom.offset = 0;

  1420.     atom.size = moov_len;

  1421. #ifdef DEBUG

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

  1423. #endif

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

  1425.     av_free(moov_data);

  1426.     av_free(cmov_data);

  1427. 

  1428.     return ret;

  1429. }

  1430. #endif

  1431. 

  1432. /* edit list atom */

  1433. static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)

  1434. {

  1435.   int i, edit_count;

  1436.   print_atom("elst", atom);

  1437. 

  1438.   get_byte(pb); /* version */

  1439.   get_byte(pb); get_byte(pb); get_byte(pb); /* flags */

  1440.   edit_count= c->streams[c->fc->nb_streams-1]->edit_count = get_be32(pb);     /* entries */

  1441.   

  1442.   for(i=0; i<edit_count; i++){

  1443.     get_be32(pb); /* Track duration */

  1444.     get_be32(pb); /* Media time */

  1445.     get_be32(pb); /* Media rate */

  1446.   }

  1447. #ifdef DEBUG

  1448.   av_log(NULL, AV_LOG_DEBUG, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->edit_count);

  1449. #endif

  1450.   return 0;

  1451. }

  1452. 

  1453. static const MOVParseTableEntry mov_default_parse_table[] = {

  1454. /* mp4 atoms */

  1455. { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },

  1456. { MKTAG( 'c', 'p', 'r', 't' ), mov_read_default },

  1457. { MKTAG( 'c', 'r', 'h', 'd' ), mov_read_default },

  1458. { MKTAG( 'c', 't', 't', 's' ), mov_read_leaf }, /* composition time to sample */

  1459. { MKTAG( 'd', 'i', 'n', 'f' ), mov_read_default }, /* data information */

  1460. { MKTAG( 'd', 'p', 'n', 'd' ), mov_read_leaf },

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

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

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

  1464. { MKTAG( 'f', 'r', 'e', 'e' ), mov_read_leaf },

  1465. { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },

  1466. { MKTAG( 'h', 'i', 'n', 't' ), mov_read_leaf },

  1467. { MKTAG( 'h', 'm', 'h', 'd' ), mov_read_leaf },

  1468. { MKTAG( 'i', 'o', 'd', 's' ), mov_read_leaf },

  1469. { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },

  1470. { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },

  1471. { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },

  1472. { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },

  1473. { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },

  1474. { MKTAG( 'm', 'p', '4', 'a' ), mov_read_default },

  1475. { MKTAG( 'm', 'p', '4', 's' ), mov_read_default },

  1476. { MKTAG( 'm', 'p', '4', 'v' ), mov_read_default },

  1477. { MKTAG( 'm', 'p', 'o', 'd' ), mov_read_leaf },

  1478. { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },

  1479. { MKTAG( 'n', 'm', 'h', 'd' ), mov_read_leaf },

  1480. { MKTAG( 'o', 'd', 'h', 'd' ), mov_read_default },

  1481. { MKTAG( 's', 'd', 'h', 'd' ), mov_read_default },

  1482. { MKTAG( 's', 'k', 'i', 'p' ), mov_read_leaf },

  1483. { MKTAG( 's', 'm', 'h', 'd' ), mov_read_leaf }, /* sound media info header */

  1484. { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorrenson extension ??? */

  1485. { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },

  1486. { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },

  1487. { MKTAG( 's', 't', 'd', 'p' ), mov_read_default },

  1488. { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },

  1489. { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */

  1490. { MKTAG( 's', 't', 's', 'h' ), mov_read_default },

  1491. { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */

  1492. { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */

  1493. { MKTAG( 's', 't', 't', 's' ), mov_read_stts },

  1494. { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */

  1495. { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },

  1496. { MKTAG( 't', 'r', 'e', 'f' ), mov_read_default }, /* not really */

  1497. { MKTAG( 'u', 'd', 't', 'a' ), mov_read_leaf },

  1498. { MKTAG( 'u', 'r', 'l', ' ' ), mov_read_leaf },

  1499. { MKTAG( 'u', 'r', 'n', ' ' ), mov_read_leaf },

  1500. { MKTAG( 'u', 'u', 'i', 'd' ), mov_read_default },

  1501. { MKTAG( 'v', 'm', 'h', 'd' ), mov_read_leaf }, /* video media info header */

  1502. { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_default },

  1503. /* extra mp4 */

  1504. { MKTAG( 'M', 'D', 'E', 'S' ), mov_read_leaf },

  1505. /* QT atoms */

  1506. { MKTAG( 'c', 'h', 'a', 'p' ), mov_read_leaf },

  1507. { MKTAG( 'c', 'l', 'i', 'p' ), mov_read_default },

  1508. { MKTAG( 'c', 'r', 'g', 'n' ), mov_read_leaf },

  1509. { MKTAG( 'c', 't', 'a', 'b' ), mov_read_ctab },

  1510. { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },

  1511. { MKTAG( 'k', 'm', 'a', 't' ), mov_read_leaf },

  1512. { MKTAG( 'm', 'a', 't', 't' ), mov_read_default },

  1513. { MKTAG( 'r', 'd', 'r', 'f' ), mov_read_leaf },

  1514. { MKTAG( 'r', 'm', 'd', 'a' ), mov_read_default },

  1515. { MKTAG( 'r', 'm', 'd', 'r' ), mov_read_leaf },

  1516. { MKTAG( 'r', 'm', 'r', 'a' ), mov_read_default },

  1517. { MKTAG( 's', 'c', 'p', 't' ), mov_read_leaf },

  1518. { MKTAG( 's', 's', 'r', 'c' ), mov_read_leaf },

  1519. { MKTAG( 's', 'y', 'n', 'c' ), mov_read_leaf },

  1520. { MKTAG( 't', 'c', 'm', 'd' ), mov_read_leaf },

  1521. { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */

  1522. //{ MKTAG( 'r', 'm', 'q', 'u' ), mov_read_leaf },

  1523. #ifdef CONFIG_ZLIB

  1524. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },

  1525. #else

  1526. { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_leaf },

  1527. #endif

  1528. { 0L, mov_read_leaf }

  1529. };

  1530. 

  1531. static void mov_free_stream_context(MOVStreamContext *sc)

  1532. {

  1533.     if(sc) {

  1534.         av_free(sc->chunk_offsets);

  1535.         av_free(sc->sample_to_chunk);

  1536.         av_free(sc->sample_sizes);

  1537.         av_free(sc->keyframes);

  1538.         av_free(sc->header_data);

  1539.         av_free(sc->stts_data);        

  1540.         av_free(sc);

  1541.     }

  1542. }

  1543. 

  1544. static inline uint32_t mov_to_tag(uint8_t *buf)

  1545. {

  1546.     return MKTAG(buf[0], buf[1], buf[2], buf[3]);

  1547. }

  1548. 

  1549. static inline uint32_t to_be32(uint8_t *buf)

  1550. {

  1551.     return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];

  1552. }

  1553. 

  1554. /* XXX: is it sufficient ? */

  1555. static int mov_probe(AVProbeData *p)

  1556. {

  1557.     unsigned int offset;

  1558.     uint32_t tag;

  1559. 

  1560.     /* check file header */

  1561.     if (p->buf_size <= 12)

  1562.         return 0;

  1563.     offset = 0;

  1564.     for(;;) {

  1565.         /* ignore invalid offset */

  1566.         if ((offset + 8) > (unsigned int)p->buf_size)

  1567.             return 0;

  1568.         tag = mov_to_tag(p->buf + offset + 4);

  1569.         switch(tag) {

  1570.         case MKTAG( 'm', 'o', 'o', 'v' ):

  1571.         case MKTAG( 'w', 'i', 'd', 'e' ):

  1572.         case MKTAG( 'f', 'r', 'e', 'e' ):

  1573.         case MKTAG( 'm', 'd', 'a', 't' ):

  1574.         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */

  1575.         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */

  1576.             return AVPROBE_SCORE_MAX;

  1577.         case MKTAG( 'f', 't', 'y', 'p' ):

  1578.         case MKTAG( 's', 'k', 'i', 'p' ):

  1579.             offset = to_be32(p->buf+offset) + offset;

  1580.             break;

  1581.         default:

  1582.             /* unrecognized tag */

  1583.             return 0;

  1584.         }

  1585.     }

  1586.     return 0;

  1587. }

  1588. 

  1589. static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1590. {

  1591.     MOVContext *mov = (MOVContext *) s->priv_data;

  1592.     ByteIOContext *pb = &s->pb;

  1593.     int i, j, nb, err;

  1594.     MOV_atom_t atom = { 0, 0, 0 };

  1595. 

  1596.     mov->fc = s;

  1597.     mov->parse_table = mov_default_parse_table;

  1598. #if 0

  1599.     /* XXX: I think we should auto detect */

  1600.     if(s->iformat->name[1] == 'p')

  1601.         mov->mp4 = 1;

  1602. #endif

  1603.     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  1604. 	atom.size = url_filesize(url_fileno(pb));

  1605.     else

  1606. 	atom.size = 0x7FFFFFFFFFFFFFFFLL;

  1607. 

  1608. #ifdef DEBUG

  1609.     av_log(NULL, AV_LOG_DEBUG, "filesz=%Ld\n", atom.size);

  1610. #endif

  1611. 

  1612.     /* check MOV header */

  1613.     err = mov_read_default(mov, pb, atom);

  1614.     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {

  1615. 	av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%lld\n",

  1616. 		err, mov->found_moov, mov->found_mdat, url_ftell(pb));

  1617. 	return -1;

  1618.     }

  1619. #ifdef DEBUG

  1620.     av_log(NULL, AV_LOG_DEBUG, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));

  1621. #endif

  1622.     /* some cleanup : make sure we are on the mdat atom */

  1623.     if(!url_is_streamed(pb) && (url_ftell(pb) != mov->mdat_offset))

  1624.         url_fseek(pb, mov->mdat_offset, SEEK_SET);

  1625. 

  1626.     mov->next_chunk_offset = mov->mdat_offset; /* initialise reading */

  1627. 

  1628. #ifdef DEBUG

  1629.     av_log(NULL, AV_LOG_DEBUG, "mdat_reset_offset=%d\n", (int) url_ftell(pb));

  1630. #endif

  1631. 

  1632. #ifdef DEBUG

  1633.     av_log(NULL, AV_LOG_DEBUG, "streams= %d\n", s->nb_streams);

  1634. #endif

  1635.     mov->total_streams = nb = s->nb_streams;

  1636. 

  1637. #if 1

  1638.     for(i=0; i<s->nb_streams;) {

  1639.         if(s->streams[i]->codec.codec_type == CODEC_TYPE_MOV_OTHER) {/* not audio, not video, delete */

  1640.             av_free(s->streams[i]);

  1641.             for(j=i+1; j<s->nb_streams; j++)

  1642.                 s->streams[j-1] = s->streams[j];

  1643.             s->nb_streams--;

  1644.         } else

  1645.             i++;

  1646.     }

  1647.     for(i=0; i<s->nb_streams;i++) {

  1648.         MOVStreamContext *sc;

  1649.         sc = (MOVStreamContext *)s->streams[i]->priv_data;

  1650.         sc->ffindex = i;

  1651.         sc->is_ff_stream = 1;

  1652.     }

  1653. #endif

  1654. #ifdef DEBUG

  1655.     av_log(NULL, AV_LOG_DEBUG, "real streams= %d\n", s->nb_streams);

  1656. #endif

  1657.     return 0;

  1658. }

  1659. 

  1660. /* Yes, this is ugly... I didn't write the specs of QT :p */

  1661. /* XXX:remove useless commented code sometime */

  1662. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  1663. {

  1664.     MOVContext *mov = (MOVContext *) s->priv_data;

  1665.     MOVStreamContext *sc;

  1666.     int64_t offset = 0x0FFFFFFFFFFFFFFFLL;

  1667.     int i, a, b, m;

  1668.     int size;

  1669.     size = 0x0FFFFFFF;

  1670. 

  1671. #ifdef MOV_SPLIT_CHUNKS

  1672.     if (mov->partial) {

  1673. 

  1674.         int idx;

  1675. 

  1676. 	sc = mov->partial;

  1677. 	idx = sc->sample_to_chunk_index;

  1678. 

  1679.         if (idx < 0) return 0;

  1680. 	size = sc->sample_sizes[sc->current_sample];

  1681. 

  1682.         sc->current_sample++;

  1683.         sc->left_in_chunk--;

  1684. 

  1685.         if (sc->left_in_chunk <= 0)

  1686.             mov->partial = 0;

  1687.         offset = mov->next_chunk_offset;

  1688.         /* extract the sample */

  1689. 

  1690.         goto readchunk;

  1691.     }

  1692. #endif

  1693. 

  1694. again:

  1695.     sc = 0;

  1696.     for(i=0; i<mov->total_streams; i++) {

  1697. 	MOVStreamContext *msc = mov->streams[i];

  1698. 	//av_log(NULL, AV_LOG_DEBUG, "MOCHUNK %ld  %d   %p  pos:%Ld\n", mov->streams[i]->next_chunk, mov->total_streams, mov->streams[i], url_ftell(&s->pb));

  1699.         if ((msc->next_chunk < msc->chunk_count) && msc->next_chunk >= 0

  1700. 	   && (msc->chunk_offsets[msc->next_chunk] < offset)) {

  1701. 	    sc = msc;

  1702. 	    offset = msc->chunk_offsets[msc->next_chunk];

  1703. 	    //av_log(NULL, AV_LOG_DEBUG, "SELETED  %Ld  i:%d\n", offset, i);

  1704.         }

  1705.     }

  1706.     if (!sc || offset==0x0FFFFFFFFFFFFFFFLL)

  1707. 	return -1;

  1708. 

  1709.     sc->next_chunk++;

  1710. 

  1711.     if(mov->next_chunk_offset < offset) { /* some meta data */

  1712.         url_fskip(&s->pb, (offset - mov->next_chunk_offset));

  1713.         mov->next_chunk_offset = offset;

  1714.     }

  1715. 

  1716. //av_log(NULL, AV_LOG_DEBUG, "chunk: [%i] %lli -> %lli\n", st_id, mov->next_chunk_offset, offset);

  1717.     if(!sc->is_ff_stream) {

  1718.         url_fskip(&s->pb, (offset - mov->next_chunk_offset));

  1719.         mov->next_chunk_offset = offset;

  1720. 	offset = 0x0FFFFFFFFFFFFFFFLL;

  1721.         goto again;

  1722.     }

  1723. 

  1724.     /* now get the chunk size... */

  1725. 

  1726.     for(i=0; i<mov->total_streams; i++) {

  1727. 	MOVStreamContext *msc = mov->streams[i];

  1728. 	if ((msc->next_chunk < msc->chunk_count)

  1729. 	    && ((msc->chunk_offsets[msc->next_chunk] - offset) < size))

  1730. 	    size = msc->chunk_offsets[msc->next_chunk] - offset;

  1731.     }

  1732. 

  1733. #ifdef MOV_MINOLTA_FIX

  1734.     //Make sure that size is according to sample_size (Needed by .mov files 

  1735.     //created on a Minolta Dimage Xi where audio chunks contains waste data in the end)

  1736.     //Maybe we should really not only check sc->sample_size, but also sc->sample_sizes

  1737.     //but I have no such movies

  1738.     if (sc->sample_size > 0) { 

  1739.         int foundsize=0;

  1740.         for(i=0; i<(sc->sample_to_chunk_sz); i++) {

  1741.             if( (sc->sample_to_chunk[i].first)<=(sc->next_chunk) && (sc->sample_size>0) )

  1742.             {

  1743. 		// I can't figure out why for PCM audio sample_size is always 1

  1744. 		// (it should actually be channels*bits_per_second/8) but it is.

  1745. 		AVCodecContext* cod = &s->streams[sc->ffindex]->codec;

  1746.                 if (sc->sample_size == 1 && (cod->codec_id == CODEC_ID_PCM_S16BE || cod->codec_id == CODEC_ID_PCM_S16LE))

  1747. 		    foundsize=(sc->sample_to_chunk[i].count*cod->channels*cod->bits_per_sample)/8;

  1748. 		else

  1749. 		    foundsize=sc->sample_to_chunk[i].count*sc->sample_size;

  1750.             }

  1751. #ifdef DEBUG

  1752.             /*av_log(NULL, AV_LOG_DEBUG, "sample_to_chunk first=%ld count=%ld, id=%ld\n", sc->sample_to_chunk[i].first, sc->sample_to_chunk[i].count, sc->sample_to_chunk[i].id);*/

  1753. #endif

  1754.         }

  1755.         if( (foundsize>0) && (foundsize<size) )

  1756.         {

  1757. #ifdef DEBUG

  1758.             /*av_log(NULL, AV_LOG_DEBUG, "this size should actually be %d\n",foundsize);*/

  1759. #endif

  1760.             size=foundsize;

  1761.         }

  1762.     }

  1763. #endif //MOV_MINOLTA_FIX

  1764. 

  1765. #ifdef MOV_SPLIT_CHUNKS

  1766.     /* split chunks into samples */

  1767.     if (sc->sample_size == 0) {

  1768.         int idx = sc->sample_to_chunk_index;

  1769.         if ((idx + 1 < sc->sample_to_chunk_sz)

  1770. 	    && (sc->next_chunk >= sc->sample_to_chunk[idx + 1].first))

  1771.            idx++;

  1772.         sc->sample_to_chunk_index = idx;

  1773.         if (idx >= 0 && sc->sample_to_chunk[idx].count != 1) {

  1774. 	    mov->partial = sc;

  1775.             /* we'll have to get those samples before next chunk */

  1776.             sc->left_in_chunk = sc->sample_to_chunk[idx].count - 1;

  1777.             size = sc->sample_sizes[sc->current_sample];

  1778.         }

  1779. 

  1780.         sc->current_sample++;

  1781.     }

  1782. #endif

  1783. 

  1784. readchunk:

  1785. //av_log(NULL, AV_LOG_DEBUG, "chunk: [%i] %lli -> %lli (%i)\n", st_id, offset, offset + size, size);

  1786.     if(size == 0x0FFFFFFF)

  1787.         size = mov->mdat_size + mov->mdat_offset - offset;

  1788.     if(size < 0)

  1789.         return -1;

  1790.     if(size == 0)

  1791.         return -1;

  1792.     url_fseek(&s->pb, offset, SEEK_SET);

  1793. 

  1794.     //av_log(NULL, AV_LOG_DEBUG, "READCHUNK hlen: %d  %d off: %Ld   pos:%Ld\n", size, sc->header_len, offset, url_ftell(&s->pb));

  1795.     if (sc->header_len > 0) {

  1796.         av_new_packet(pkt, size + sc->header_len);

  1797.         memcpy(pkt->data, sc->header_data, sc->header_len);

  1798.         get_buffer(&s->pb, pkt->data + sc->header_len, size);

  1799.         /* free header */

  1800.         av_freep(&sc->header_data);

  1801.         sc->header_len = 0;

  1802.     } else {

  1803.         av_new_packet(pkt, size);

  1804.         get_buffer(&s->pb, pkt->data, pkt->size);

  1805.     }

  1806.     pkt->stream_index = sc->ffindex;

  1807.     

  1808.     // If the keyframes table exists, mark any samples that are in the table as key frames.

  1809.     // If no table exists, treat very sample as a key frame.

  1810.     if (sc->keyframes) {        

  1811.         a = 0;

  1812.         b = sc->keyframe_count - 1;

  1813.         

  1814.         while (a < b) {

  1815.             m = (a + b + 1) >> 1;

  1816.             if (sc->keyframes[m] > sc->current_sample) {

  1817.                 b = m - 1;

  1818.             } else {

  1819.                 a = m;

  1820.             }    

  1821.         }

  1822.         

  1823.         if (sc->keyframes[a] == sc->current_sample)

  1824.             pkt->flags |= PKT_FLAG_KEY;

  1825.     }

  1826.     else

  1827.         pkt->flags |= PKT_FLAG_KEY;

  1828. 

  1829. #ifdef DEBUG

  1830. /*

  1831.     av_log(NULL, AV_LOG_DEBUG, "Packet (%d, %d, %ld) ", pkt->stream_index, st_id, pkt->size);

  1832.     for(i=0; i<8; i++)

  1833.         av_log(NULL, AV_LOG_DEBUG, "%02x ", pkt->data[i]);

  1834.     for(i=0; i<8; i++)

  1835.         av_log(NULL, AV_LOG_DEBUG, "%c ", (pkt->data[i]) & 0x7F);

  1836.     puts("");

  1837. */

  1838. #endif

  1839. 

  1840.     mov->next_chunk_offset = offset + size;

  1841. 

  1842.     return 0;

  1843. }

  1844. 

  1845. #if defined(MOV_SPLIT_CHUNKS) && defined(MOV_SEEK)

  1846. /**

  1847.  * Seek method based on the one described in the Appendix C of QTFileFormat.pdf

  1848.  */

  1849. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

  1850. {

  1851.     MOVContext* mov = (MOVContext *) s->priv_data;

  1852.     MOVStreamContext* sc;

  1853.     int32_t i, a, b, m;

  1854.     int64_t sample_time;

  1855.     int64_t start_time;

  1856.     int32_t seek_sample, sample;

  1857.     int32_t duration;

  1858.     int32_t count;

  1859.     int32_t chunk;

  1860.     int32_t left_in_chunk;

  1861.     int64_t chunk_file_offset;

  1862.     int64_t sample_file_offset;

  1863.     int32_t first_chunk_sample;

  1864.     int32_t sample_to_chunk_idx;

  1865.     int mov_idx;

  1866. 

  1867.     // Find the corresponding mov stream

  1868.     for (mov_idx = 0; mov_idx < mov->total_streams; mov_idx++)

  1869.         if (mov->streams[mov_idx]->ffindex == stream_index)

  1870.             break;

  1871.     if (mov_idx == mov->total_streams) {

  1872.         av_log(s, AV_LOG_ERROR, "mov: requested stream was not found in mov streams (idx=%i)\n", stream_index);

  1873.         return -1;

  1874.     }

  1875.     sc = mov->streams[mov_idx];

  1876. 

  1877.     // Step 1. Find the edit that contains the requested time (elst)

  1878.     if (sc->edit_count) {

  1879.         // FIXME should handle edit list

  1880.         av_log(s, AV_LOG_ERROR, "mov: does not handle seeking in files that contain edit list (c:%d)\n", sc->edit_count);

  1881.         return -1;

  1882.     }

  1883. 

  1884.     // Step 2. Find the corresponding sample using the Time-to-sample atom (stts) */

  1885. #ifdef DEBUG

  1886.   av_log(s, AV_LOG_DEBUG, "Searching for time %li in stream #%i (time_scale=%i)\n", (long)timestamp, mov_idx, sc->time_scale);

  1887. #endif

  1888.     // convert timestamp from time_base unit to timescale unit

  1889.     sample_time = av_rescale( timestamp,

  1890.                             (int64_t)sc->time_scale * s->streams[stream_index]->time_base.num,

  1891.                             (int64_t)s->streams[stream_index]->time_base.den);

  1892.     start_time = 0; // FIXME use elst atom

  1893.     sample = 1; // sample are 0 based in table

  1894. #ifdef DEBUG

  1895.     av_log(s, AV_LOG_DEBUG, "Searching for sample_time %li \n", (long)sample_time);

  1896. #endif

  1897.     for (i = 0; i < sc->stts_count; i++) {

  1898.         count = (uint32_t)(sc->stts_data[i]>>32);

  1899.         duration = (uint32_t)(sc->stts_data[i]&0xffff);

  1900. //av_log(s, AV_LOG_DEBUG, "> sample_time %lli \n", (long)sample_time);                

  1901. //av_log(s, AV_LOG_DEBUG, "> count=%i duration=%i\n", count, duration);        

  1902.         if ((start_time + count*duration) > sample_time) {

  1903.             sample += (sample_time - start_time) / duration;

  1904.             break;

  1905.         }

  1906.         sample += count;

  1907.         start_time += count * duration;

  1908.     }   

  1909.     /* NOTE: despite what qt doc say, the dt value (Display Time in qt vocabulary) computed with the stts atom

  1910.        is a decoding time stamp (dts) not a presentation time stamp. And as usual dts != pts for stream with b frames */

  1911. 

  1912. #ifdef DEBUG

  1913.     av_log(s, AV_LOG_DEBUG, "Found time %li at sample #%u\n", (long)sample_time, sample);

  1914. #endif

  1915.     if (sample > sc->sample_count) {

  1916.         av_log(s, AV_LOG_ERROR, "mov: sample pos is too high, unable to seek (req. sample=%i, sample count=%ld)\n", sample, sc->sample_count);

  1917.         return -1;

  1918.     }

  1919. 

  1920.     // Step 3. Find the prior sync. sample using the Sync sample atom (stss)

  1921.     if (sc->keyframes) {

  1922.         a = 0;

  1923.         b = sc->keyframe_count - 1;

  1924.         while (a < b) {

  1925.             m = (a + b + 1) >> 1;

  1926.             if (sc->keyframes[m] > sample) {

  1927.                 b = m - 1;

  1928.             } else {

  1929.                 a = m;

  1930.             }

  1931. #ifdef DEBUG

  1932.          // av_log(s, AV_LOG_DEBUG, "a=%i (%i) b=%i (%i) m=%i (%i) stream #%i\n", a, sc->keyframes[a], b, sc->keyframes[b], m, sc->keyframes[m], mov_idx);

  1933. #endif

  1934.         }

  1935.         seek_sample = sc->keyframes[a];

  1936.     }

  1937.     else

  1938.         seek_sample = sample; // else all samples are key frames

  1939. #ifdef DEBUG

  1940.     av_log(s, AV_LOG_DEBUG, "Found nearest keyframe at sample #%i \n", seek_sample);

  1941. #endif

  1942. 

  1943.     // Step 4. Find the chunk of the sample using the Sample-to-chunk-atom (stsc)

  1944.     for (first_chunk_sample = 1, i = 0; i < (sc->sample_to_chunk_sz - 1); i++) {

  1945.         b = (sc->sample_to_chunk[i + 1].first - sc->sample_to_chunk[i].first) * sc->sample_to_chunk[i].count;

  1946.         if (seek_sample >= first_chunk_sample && seek_sample < (first_chunk_sample + b))

  1947.             break;

  1948.         first_chunk_sample += b;

  1949.     }

  1950.     chunk = sc->sample_to_chunk[i].first + (seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count;

  1951.     left_in_chunk = sc->sample_to_chunk[i].count - (seek_sample - first_chunk_sample) % sc->sample_to_chunk[i].count;

  1952.     first_chunk_sample += ((seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count) * sc->sample_to_chunk[i].count;

  1953.     sample_to_chunk_idx = i;

  1954. #ifdef DEBUG

  1955.     av_log(s, AV_LOG_DEBUG, "Sample was found in chunk #%i at sample offset %i (idx %i)\n", chunk, seek_sample - first_chunk_sample, sample_to_chunk_idx);

  1956. #endif

  1957. 

  1958.     // Step 5. Find the offset of the chunk using the chunk offset atom

  1959.     if (!sc->chunk_offsets) {

  1960.         av_log(s, AV_LOG_ERROR, "mov: no chunk offset atom, unable to seek\n");

  1961.         return -1;

  1962.     }

  1963.     if (chunk > sc->chunk_count) {

  1964.         av_log(s, AV_LOG_ERROR, "mov: chunk offset atom too short, unable to seek (req. chunk=%i, chunk count=%li)\n", chunk, sc->chunk_count);

  1965.         return -1;

  1966.     }

  1967.     chunk_file_offset = sc->chunk_offsets[chunk - 1];

  1968. #ifdef DEBUG

  1969.     av_log(s, AV_LOG_DEBUG, "Chunk file offset is #%llu \n", chunk_file_offset);

  1970. #endif

  1971. 

  1972.     // Step 6. Find the byte offset within the chunk using the sample size atom

  1973.     sample_file_offset = chunk_file_offset;

  1974.     if (sc->sample_size)

  1975.         sample_file_offset += (seek_sample - first_chunk_sample) * sc->sample_size;

  1976.     else {

  1977.         for (i = 0; i < (seek_sample - first_chunk_sample); i++) {

  1978.         sample_file_offset += sc->sample_sizes[first_chunk_sample + i - 1];

  1979.         }

  1980.     }

  1981. #ifdef DEBUG

  1982.     av_log(s, AV_LOG_DEBUG, "Sample file offset is #%llu \n", sample_file_offset);

  1983. #endif

  1984. 

  1985.     // Step 6. Update the parser

  1986.     mov->partial = sc;

  1987.     mov->next_chunk_offset = sample_file_offset;

  1988.     // Update current stream state

  1989.     sc->current_sample = seek_sample - 1;  // zero based

  1990.     sc->left_in_chunk = left_in_chunk;

  1991.     sc->next_chunk = chunk; // +1 -1 (zero based)

  1992.     sc->sample_to_chunk_index = sample_to_chunk_idx;

  1993. 

  1994.     // Update other streams    

  1995.     for (i = 0; i<mov->total_streams; i++) {

  1996.         MOVStreamContext *msc;

  1997.         if (i == mov_idx) continue;

  1998.         // Find the nearest 'next' chunk

  1999.         msc = mov->streams[i];

  2000.         a = 0;

  2001.         b = msc->chunk_count - 1;

  2002.         while (a < b) {

  2003.             m = (a + b + 1) >> 1;

  2004.             if (msc->chunk_offsets[m] > chunk_file_offset) {

  2005.                 b = m - 1;

  2006.             } else {

  2007.                 a = m;

  2008.             }

  2009. #ifdef DEBUG            

  2010. /*            av_log(s, AV_LOG_DEBUG, "a=%i (%li) b=%i (%li) m=%i (%li) stream #%i\n"

  2011.             , a, (long)msc->chunk_offsets[a], b, (long)msc->chunk_offsets[b], m, (long)msc->chunk_offsets[m],  i); */

  2012. #endif                  

  2013.         }

  2014.         msc->next_chunk = a;

  2015.         if (msc->chunk_offsets[a] < chunk_file_offset && a < (msc->chunk_count-1))

  2016.             msc->next_chunk ++;

  2017. #ifdef DEBUG        

  2018.         av_log(s, AV_LOG_DEBUG, "Nearest next chunk for stream #%i is #%i @%lli\n", i, msc->next_chunk+1, msc->chunk_offsets[msc->next_chunk]);

  2019. #endif        

  2020.         // Compute sample count and index in the sample_to_chunk table (what a pity)

  2021.         msc->sample_to_chunk_index = 0;

  2022.         msc->current_sample = 0;

  2023.         for(;  msc->sample_to_chunk_index < (msc->sample_to_chunk_sz - 1)

  2024.             && msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first <= (1 + msc->next_chunk); msc->sample_to_chunk_index++) {

  2025.             msc->current_sample += (msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first - msc->sample_to_chunk[msc->sample_to_chunk_index].first) \

  2026.             * msc->sample_to_chunk[msc->sample_to_chunk_index].count;

  2027.         }

  2028.         msc->current_sample += (msc->next_chunk - (msc->sample_to_chunk[msc->sample_to_chunk_index].first - 1)) * sc->sample_to_chunk[msc->sample_to_chunk_index].count;

  2029.         msc->left_in_chunk = msc->sample_to_chunk[msc->sample_to_chunk_index].count - 1;

  2030. #ifdef DEBUG        

  2031.         av_log(s, AV_LOG_DEBUG, "Next Sample for stream #%i is #%i @%i\n", i, msc->current_sample + 1, msc->sample_to_chunk_index + 1);

  2032. #endif        

  2033.     }                

  2034.     return 0;

  2035. }

  2036. #endif

  2037. 

  2038. static int mov_read_close(AVFormatContext *s)

  2039. {

  2040.     int i;

  2041.     MOVContext *mov = (MOVContext *) s->priv_data;

  2042.     for(i=0; i<mov->total_streams; i++)

  2043.         mov_free_stream_context(mov->streams[i]);

  2044.     /* free color tabs */

  2045.     for(i=0; i<mov->ctab_size; i++)

  2046. 	av_freep(&mov->ctab[i]);

  2047.     av_freep(&mov->ctab);

  2048.     return 0;

  2049. }

  2050. 

  2051. static AVInputFormat mov_iformat = {

  2052.     "mov,mp4,m4a,3gp",

  2053.     "QuickTime/MPEG4 format",

  2054.     sizeof(MOVContext),

  2055.     mov_probe,

  2056.     mov_read_header,

  2057.     mov_read_packet,

  2058.     mov_read_close,

  2059. #if defined(MOV_SPLIT_CHUNKS) && defined(MOV_SEEK)

  2060.     mov_read_seek,

  2061. #endif    

  2062. };

  2063. 

  2064. int mov_init(void)

  2065. {

  2066.     av_register_input_format(&mov_iformat);

  2067.     return 0;

  2068. }