2 * Matroska file demuxer
3 * Copyright (c) 2003-2008 The FFmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
24 * Matroska file demuxer
25 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
26 * with a little help from Moritz Bunkus <moritz@bunkus.org>
27 * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28 * Specs available on the Matroska project page: http://www.matroska.org/.
32 /* For codec_get_id(). */
36 #include "libavcodec/mpeg4audio.h"
37 #include "libavutil/intfloat_readwrite.h"
38 #include "libavutil/avstring.h"
39 #include "libavutil/lzo.h"
59 typedef const struct EbmlSyntax {
68 const struct EbmlSyntax *n;
88 uint64_t doctype_version;
94 } MatroskaTrackCompression;
99 MatroskaTrackCompression compression;
100 } MatroskaTrackEncoding;
104 uint64_t display_width;
105 uint64_t display_height;
106 uint64_t pixel_width;
107 uint64_t pixel_height;
109 } MatroskaTrackVideo;
113 double out_samplerate;
117 /* real audio header (extracted from extradata) */
125 } MatroskaTrackAudio;
134 uint64_t default_duration;
135 uint64_t flag_default;
136 MatroskaTrackVideo video;
137 MatroskaTrackAudio audio;
147 } MatroskaAttachement;
177 AVFormatContext *ctx;
181 MatroskaLevel levels[EBML_MAX_DEPTH];
188 EbmlList attachments;
193 /* byte position of the segment inside the stream */
194 offset_t segment_start;
196 /* the packet queue */
203 /* What to skip before effectively reading a packet. */
204 int skip_to_keyframe;
205 AVStream *skip_to_stream;
206 } MatroskaDemuxContext;
219 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(*x))
221 static EbmlSyntax ebml_header[] = {
222 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
223 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
224 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
225 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml,doctype), {.s="(none)"} },
226 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
227 { EBML_ID_EBMLVERSION, EBML_NONE },
228 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
229 { EBML_ID_VOID, EBML_NONE },
233 static EbmlSyntax ebml_syntax[] = {
234 { EBML_ID_HEADER, EBML_NEST, 0, 0, {.n=ebml_header} },
238 static EbmlSyntax matroska_info[] = {
239 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
240 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
241 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext,title) },
242 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
243 { MATROSKA_ID_MUXINGAPP, EBML_NONE },
244 { MATROSKA_ID_DATEUTC, EBML_NONE },
245 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
246 { EBML_ID_VOID, EBML_NONE },
250 static EbmlSyntax matroska_track_video[] = {
251 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
252 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
253 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
254 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
255 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
256 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
257 { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
258 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE },
259 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
260 { EBML_ID_VOID, EBML_NONE },
264 static EbmlSyntax matroska_track_audio[] = {
265 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
266 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
267 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
268 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
269 { EBML_ID_VOID, EBML_NONE },
273 static EbmlSyntax matroska_track_encoding_compression[] = {
274 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
275 { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
276 { EBML_ID_VOID, EBML_NONE },
280 static EbmlSyntax matroska_track_encoding[] = {
281 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
282 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
283 { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
284 { EBML_ID_VOID, EBML_NONE },
288 static EbmlSyntax matroska_track_encodings[] = {
289 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
290 { EBML_ID_VOID, EBML_NONE },
294 static EbmlSyntax matroska_track[] = {
295 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack,num) },
296 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack,type) },
297 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack,codec_id) },
298 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack,codec_priv) },
299 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
300 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
301 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
302 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
303 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
304 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
305 { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
306 { MATROSKA_ID_TRACKUID, EBML_NONE },
307 { MATROSKA_ID_TRACKNAME, EBML_NONE },
308 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
309 { MATROSKA_ID_TRACKFLAGFORCED, EBML_NONE },
310 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
311 { MATROSKA_ID_CODECNAME, EBML_NONE },
312 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
313 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
314 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
315 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
316 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
317 { EBML_ID_VOID, EBML_NONE },
321 static EbmlSyntax matroska_tracks[] = {
322 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
323 { EBML_ID_VOID, EBML_NONE },
327 static EbmlSyntax matroska_attachment[] = {
328 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
329 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachement,mime) },
330 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachement,bin) },
331 { MATROSKA_ID_FILEUID, EBML_NONE },
332 { EBML_ID_VOID, EBML_NONE },
336 static EbmlSyntax matroska_attachments[] = {
337 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
338 { EBML_ID_VOID, EBML_NONE },
342 static EbmlSyntax matroska_chapter_display[] = {
343 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
344 { EBML_ID_VOID, EBML_NONE },
348 static EbmlSyntax matroska_chapter_entry[] = {
349 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
350 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
351 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
352 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
353 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
354 { EBML_ID_VOID, EBML_NONE },
358 static EbmlSyntax matroska_chapter[] = {
359 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
360 { MATROSKA_ID_EDITIONUID, EBML_NONE },
361 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
362 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
363 { EBML_ID_VOID, EBML_NONE },
367 static EbmlSyntax matroska_chapters[] = {
368 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
369 { EBML_ID_VOID, EBML_NONE },
373 static EbmlSyntax matroska_index_pos[] = {
374 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
375 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
376 { EBML_ID_VOID, EBML_NONE },
380 static EbmlSyntax matroska_index_entry[] = {
381 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex,time) },
382 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
383 { EBML_ID_VOID, EBML_NONE },
387 static EbmlSyntax matroska_index[] = {
388 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
389 { EBML_ID_VOID, EBML_NONE },
393 static EbmlSyntax matroska_tags[] = {
394 { EBML_ID_VOID, EBML_NONE },
398 static EbmlSyntax matroska_seekhead_entry[] = {
399 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
400 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
401 { EBML_ID_VOID, EBML_NONE },
405 static EbmlSyntax matroska_seekhead[] = {
406 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
407 { EBML_ID_VOID, EBML_NONE },
411 static EbmlSyntax matroska_segment[] = {
412 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, {.n=matroska_info } },
413 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, {.n=matroska_tracks } },
414 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, {.n=matroska_attachments} },
415 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, {.n=matroska_chapters } },
416 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, {.n=matroska_index } },
417 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, {.n=matroska_tags } },
418 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, {.n=matroska_seekhead } },
419 { MATROSKA_ID_CLUSTER, EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
420 { EBML_ID_VOID, EBML_NONE },
424 static EbmlSyntax matroska_segments[] = {
425 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, {.n=matroska_segment } },
429 static EbmlSyntax matroska_blockgroup[] = {
430 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
431 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
432 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
433 { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
434 { EBML_ID_VOID, EBML_NONE },
438 static EbmlSyntax matroska_cluster[] = {
439 { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
440 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
441 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
442 { EBML_ID_VOID, EBML_NONE },
446 static EbmlSyntax matroska_clusters[] = {
447 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, {.n=matroska_cluster} },
452 * Return: Whether we reached the end of a level in the hierarchy or not.
454 static int ebml_level_end(MatroskaDemuxContext *matroska)
456 ByteIOContext *pb = matroska->ctx->pb;
457 offset_t pos = url_ftell(pb);
459 if (matroska->num_levels > 0) {
460 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
461 if (pos - level->start >= level->length) {
462 matroska->num_levels--;
470 * Read: an "EBML number", which is defined as a variable-length
471 * array of bytes. The first byte indicates the length by giving a
472 * number of 0-bits followed by a one. The position of the first
473 * "one" bit inside the first byte indicates the length of this
475 * Returns: number of bytes read, < 0 on error
477 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
478 int max_size, uint64_t *number)
480 int len_mask = 0x80, read = 1, n = 1;
483 /* The first byte tells us the length in bytes - get_byte() can normally
484 * return 0, but since that's not a valid first ebmlID byte, we can
485 * use it safely here to catch EOS. */
486 if (!(total = get_byte(pb))) {
487 /* we might encounter EOS here */
489 offset_t pos = url_ftell(pb);
490 av_log(matroska->ctx, AV_LOG_ERROR,
491 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
494 return AVERROR(EIO); /* EOS or actual I/O error */
497 /* get the length of the EBML number */
498 while (read <= max_size && !(total & len_mask)) {
502 if (read > max_size) {
503 offset_t pos = url_ftell(pb) - 1;
504 av_log(matroska->ctx, AV_LOG_ERROR,
505 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
506 (uint8_t) total, pos, pos);
507 return AVERROR_INVALIDDATA;
510 /* read out length */
513 total = (total << 8) | get_byte(pb);
521 * Read the next element as an unsigned int.
522 * 0 is success, < 0 is failure.
524 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
528 if (size < 1 || size > 8)
529 return AVERROR_INVALIDDATA;
531 /* big-endian ordering; build up number */
534 *num = (*num << 8) | get_byte(pb);
540 * Read the next element as a float.
541 * 0 is success, < 0 is failure.
543 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
546 *num= av_int2flt(get_be32(pb));
548 *num= av_int2dbl(get_be64(pb));
550 return AVERROR_INVALIDDATA;
556 * Read the next element as an ASCII string.
557 * 0 is success, < 0 is failure.
559 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
562 /* EBML strings are usually not 0-terminated, so we allocate one
563 * byte more, read the string and NULL-terminate it ourselves. */
564 if (!(*str = av_malloc(size + 1)))
565 return AVERROR(ENOMEM);
566 if (get_buffer(pb, (uint8_t *) *str, size) != size) {
576 * Read the next element as binary data.
577 * 0 is success, < 0 is failure.
579 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
582 if (!(bin->data = av_malloc(length)))
583 return AVERROR(ENOMEM);
586 bin->pos = url_ftell(pb);
587 if (get_buffer(pb, bin->data, length) != length)
594 * Read the next element, but only the header. The contents
595 * are supposed to be sub-elements which can be read separately.
596 * 0 is success, < 0 is failure.
598 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
600 ByteIOContext *pb = matroska->ctx->pb;
601 MatroskaLevel *level;
603 if (matroska->num_levels >= EBML_MAX_DEPTH) {
604 av_log(matroska->ctx, AV_LOG_ERROR,
605 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
606 return AVERROR(ENOSYS);
609 level = &matroska->levels[matroska->num_levels++];
610 level->start = url_ftell(pb);
611 level->length = length;
617 * Read signed/unsigned "EBML" numbers.
618 * Return: number of bytes processed, < 0 on error
620 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
621 uint8_t *data, uint32_t size, uint64_t *num)
624 init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
625 return ebml_read_num(matroska, &pb, 8, num);
629 * Same as above, but signed.
631 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
632 uint8_t *data, uint32_t size, int64_t *num)
637 /* read as unsigned number first */
638 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
641 /* make signed (weird way) */
642 *num = unum - ((1LL << (7*res - 1)) - 1);
647 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
648 EbmlSyntax *syntax, void *data);
650 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
651 uint32_t id, void *data)
654 for (i=0; syntax[i].id; i++)
655 if (id == syntax[i].id)
658 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
659 return ebml_parse_elem(matroska, &syntax[i], data);
662 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
666 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
668 return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
671 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
676 for (i=0; syntax[i].id; i++)
677 switch (syntax[i].type) {
679 *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
682 *(double *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
686 *(char **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
690 while (!res && !ebml_level_end(matroska))
691 res = ebml_parse(matroska, syntax, data);
696 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
697 EbmlSyntax *syntax, void *data)
699 ByteIOContext *pb = matroska->ctx->pb;
700 uint32_t id = syntax->id;
704 data = (char *)data + syntax->data_offset;
705 if (syntax->list_elem_size) {
706 EbmlList *list = data;
707 list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
708 data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
709 memset(data, 0, syntax->list_elem_size);
713 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
714 if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
717 switch (syntax->type) {
718 case EBML_UINT: res = ebml_read_uint (pb, length, data); break;
719 case EBML_FLOAT: res = ebml_read_float (pb, length, data); break;
721 case EBML_UTF8: res = ebml_read_ascii (pb, length, data); break;
722 case EBML_BIN: res = ebml_read_binary(pb, length, data); break;
723 case EBML_NEST: if ((res=ebml_read_master(matroska, length)) < 0)
725 if (id == MATROSKA_ID_SEGMENT)
726 matroska->segment_start = url_ftell(matroska->ctx->pb);
727 return ebml_parse_nest(matroska, syntax->def.n, data);
728 case EBML_PASS: return ebml_parse_id(matroska, syntax->def.n, id, data);
729 case EBML_STOP: *(int *)data = 1; return 1;
730 default: url_fskip(pb, length); return 0;
732 if (res == AVERROR_INVALIDDATA)
733 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
734 else if (res == AVERROR(EIO))
735 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
739 static void ebml_free(EbmlSyntax *syntax, void *data)
742 for (i=0; syntax[i].id; i++) {
743 void *data_off = (char *)data + syntax[i].data_offset;
744 switch (syntax[i].type) {
746 case EBML_UTF8: av_freep(data_off); break;
747 case EBML_BIN: av_freep(&((EbmlBin *)data_off)->data); break;
749 if (syntax[i].list_elem_size) {
750 EbmlList *list = data_off;
751 char *ptr = list->elem;
752 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
753 ebml_free(syntax[i].def.n, ptr);
756 ebml_free(syntax[i].def.n, data_off);
766 static int matroska_probe(AVProbeData *p)
769 int len_mask = 0x80, size = 1, n = 1;
770 char probe_data[] = "matroska";
773 if (AV_RB32(p->buf) != EBML_ID_HEADER)
776 /* length of header */
778 while (size <= 8 && !(total & len_mask)) {
784 total &= (len_mask - 1);
786 total = (total << 8) | p->buf[4 + n++];
788 /* Does the probe data contain the whole header? */
789 if (p->buf_size < 4 + size + total)
792 /* The header must contain the document type 'matroska'. For now,
793 * we don't parse the whole header but simply check for the
794 * availability of that array of characters inside the header.
795 * Not fully fool-proof, but good enough. */
796 for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
797 if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
798 return AVPROBE_SCORE_MAX;
803 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
806 MatroskaTrack *tracks = matroska->tracks.elem;
809 for (i=0; i < matroska->tracks.nb_elem; i++)
810 if (tracks[i].num == num)
813 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
817 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
818 MatroskaTrack *track)
820 MatroskaTrackEncoding *encodings = track->encodings.elem;
821 uint8_t* data = *buf;
822 int isize = *buf_size;
823 uint8_t* pkt_data = NULL;
824 int pkt_size = isize;
828 switch (encodings[0].compression.algo) {
829 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
830 return encodings[0].compression.settings.size;
831 case MATROSKA_TRACK_ENCODING_COMP_LZO:
833 olen = pkt_size *= 3;
834 pkt_data = av_realloc(pkt_data,
835 pkt_size+LZO_OUTPUT_PADDING);
836 result = lzo1x_decode(pkt_data, &olen, data, &isize);
837 } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
843 case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
844 z_stream zstream = {0};
845 if (inflateInit(&zstream) != Z_OK)
847 zstream.next_in = data;
848 zstream.avail_in = isize;
851 pkt_data = av_realloc(pkt_data, pkt_size);
852 zstream.avail_out = pkt_size - zstream.total_out;
853 zstream.next_out = pkt_data + zstream.total_out;
854 result = inflate(&zstream, Z_NO_FLUSH);
855 } while (result==Z_OK && pkt_size<10000000);
856 pkt_size = zstream.total_out;
857 inflateEnd(&zstream);
858 if (result != Z_STREAM_END)
864 case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
865 bz_stream bzstream = {0};
866 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
868 bzstream.next_in = data;
869 bzstream.avail_in = isize;
872 pkt_data = av_realloc(pkt_data, pkt_size);
873 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
874 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
875 result = BZ2_bzDecompress(&bzstream);
876 } while (result==BZ_OK && pkt_size<10000000);
877 pkt_size = bzstream.total_out_lo32;
878 BZ2_bzDecompressEnd(&bzstream);
879 if (result != BZ_STREAM_END)
887 *buf_size = pkt_size;
894 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
896 EbmlList *seekhead_list = &matroska->seekhead;
897 MatroskaSeekhead *seekhead = seekhead_list->elem;
898 uint32_t level_up = matroska->level_up;
899 offset_t before_pos = url_ftell(matroska->ctx->pb);
903 for (i=0; i<seekhead_list->nb_elem; i++) {
904 offset_t offset = seekhead[i].pos + matroska->segment_start;
906 if (seekhead[i].pos <= before_pos
907 || seekhead[i].id == MATROSKA_ID_SEEKHEAD
908 || seekhead[i].id == MATROSKA_ID_CLUSTER)
912 if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
915 /* We don't want to lose our seekhead level, so we add
916 * a dummy. This is a crude hack. */
917 if (matroska->num_levels == EBML_MAX_DEPTH) {
918 av_log(matroska->ctx, AV_LOG_INFO,
919 "Max EBML element depth (%d) reached, "
920 "cannot parse further.\n", EBML_MAX_DEPTH);
925 level.length = (uint64_t)-1;
926 matroska->levels[matroska->num_levels] = level;
927 matroska->num_levels++;
929 ebml_parse(matroska, matroska_segment, matroska);
931 /* remove dummy level */
932 while (matroska->num_levels) {
933 uint64_t length = matroska->levels[--matroska->num_levels].length;
934 if (length == (uint64_t)-1)
940 url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
941 matroska->level_up = level_up;
944 static int matroska_aac_profile(char *codec_id)
946 static const char *aac_profiles[] = { "MAIN", "LC", "SSR" };
949 for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
950 if (strstr(codec_id, aac_profiles[profile]))
955 static int matroska_aac_sri(int samplerate)
959 for (sri=0; sri<ARRAY_SIZE(ff_mpeg4audio_sample_rates); sri++)
960 if (ff_mpeg4audio_sample_rates[sri] == samplerate)
965 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
967 MatroskaDemuxContext *matroska = s->priv_data;
968 EbmlList *attachements_list = &matroska->attachments;
969 MatroskaAttachement *attachements;
970 EbmlList *chapters_list = &matroska->chapters;
971 MatroskaChapter *chapters;
972 MatroskaTrack *tracks;
973 EbmlList *index_list;
974 MatroskaIndex *index;
981 /* First read the EBML header. */
982 if (ebml_parse(matroska, ebml_syntax, &ebml)
983 || ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
984 || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
985 || ebml.doctype_version > 2) {
986 av_log(matroska->ctx, AV_LOG_ERROR,
987 "EBML header using unsupported features\n"
988 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
989 ebml.version, ebml.doctype, ebml.doctype_version);
990 return AVERROR_NOFMT;
992 ebml_free(ebml_syntax, &ebml);
994 /* The next thing is a segment. */
995 if (ebml_parse(matroska, matroska_segments, matroska) < 0)
997 matroska_execute_seekhead(matroska);
999 if (matroska->duration)
1000 matroska->ctx->duration = matroska->duration * matroska->time_scale
1001 * 1000 / AV_TIME_BASE;
1002 if (matroska->title)
1003 strncpy(matroska->ctx->title, matroska->title,
1004 sizeof(matroska->ctx->title)-1);
1006 tracks = matroska->tracks.elem;
1007 for (i=0; i < matroska->tracks.nb_elem; i++) {
1008 MatroskaTrack *track = &tracks[i];
1009 enum CodecID codec_id = CODEC_ID_NONE;
1010 EbmlList *encodings_list = &tracks->encodings;
1011 MatroskaTrackEncoding *encodings = encodings_list->elem;
1012 uint8_t *extradata = NULL;
1013 int extradata_size = 0;
1014 int extradata_offset = 0;
1016 /* Apply some sanity checks. */
1017 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1018 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1019 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1020 av_log(matroska->ctx, AV_LOG_INFO,
1021 "Unknown or unsupported track type %"PRIu64"\n",
1025 if (track->codec_id == NULL)
1028 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1029 if (!track->default_duration)
1030 track->default_duration = 1000000000/track->video.frame_rate;
1031 if (!track->video.display_width)
1032 track->video.display_width = track->video.pixel_width;
1033 if (!track->video.display_height)
1034 track->video.display_height = track->video.pixel_height;
1035 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1036 if (!track->audio.out_samplerate)
1037 track->audio.out_samplerate = track->audio.samplerate;
1039 if (encodings_list->nb_elem > 1) {
1040 av_log(matroska->ctx, AV_LOG_ERROR,
1041 "Multiple combined encodings no supported");
1042 } else if (encodings_list->nb_elem == 1) {
1043 if (encodings[0].type ||
1044 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1046 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1049 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1051 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1052 encodings[0].scope = 0;
1053 av_log(matroska->ctx, AV_LOG_ERROR,
1054 "Unsupported encoding type");
1055 } else if (track->codec_priv.size && encodings[0].scope&2) {
1056 uint8_t *codec_priv = track->codec_priv.data;
1057 int offset = matroska_decode_buffer(&track->codec_priv.data,
1058 &track->codec_priv.size,
1061 track->codec_priv.data = NULL;
1062 track->codec_priv.size = 0;
1063 av_log(matroska->ctx, AV_LOG_ERROR,
1064 "Failed to decode codec private data\n");
1065 } else if (offset > 0) {
1066 track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1067 memcpy(track->codec_priv.data,
1068 encodings[0].compression.settings.data, offset);
1069 memcpy(track->codec_priv.data+offset, codec_priv,
1070 track->codec_priv.size);
1071 track->codec_priv.size += offset;
1073 if (codec_priv != track->codec_priv.data)
1074 av_free(codec_priv);
1078 for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1079 if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1080 strlen(ff_mkv_codec_tags[j].str))){
1081 codec_id= ff_mkv_codec_tags[j].id;
1086 st = track->stream = av_new_stream(s, 0);
1088 return AVERROR(ENOMEM);
1090 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1091 && track->codec_priv.size >= 40
1092 && track->codec_priv.data != NULL) {
1093 track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1094 codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1095 } else if (!strcmp(track->codec_id, "A_MS/ACM")
1096 && track->codec_priv.size >= 18
1097 && track->codec_priv.data != NULL) {
1098 uint16_t tag = AV_RL16(track->codec_priv.data);
1099 codec_id = codec_get_id(codec_wav_tags, tag);
1100 } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1101 && (track->codec_priv.size >= 86)
1102 && (track->codec_priv.data != NULL)) {
1103 track->video.fourcc = AV_RL32(track->codec_priv.data);
1104 codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1105 } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1106 int profile = matroska_aac_profile(track->codec_id);
1107 int sri = matroska_aac_sri(track->audio.samplerate);
1108 extradata = av_malloc(5);
1109 if (extradata == NULL)
1110 return AVERROR(ENOMEM);
1111 extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1112 extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1113 if (strstr(track->codec_id, "SBR")) {
1114 sri = matroska_aac_sri(track->audio.out_samplerate);
1115 extradata[2] = 0x56;
1116 extradata[3] = 0xE5;
1117 extradata[4] = 0x80 | (sri<<3);
1121 } else if (codec_id == CODEC_ID_TTA) {
1123 extradata_size = 30;
1124 extradata = av_mallocz(extradata_size);
1125 if (extradata == NULL)
1126 return AVERROR(ENOMEM);
1127 init_put_byte(&b, extradata, extradata_size, 1,
1128 NULL, NULL, NULL, NULL);
1129 put_buffer(&b, "TTA1", 4);
1131 put_le16(&b, track->audio.channels);
1132 put_le16(&b, track->audio.bitdepth);
1133 put_le32(&b, track->audio.out_samplerate);
1134 put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1135 } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1136 codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1137 extradata_offset = 26;
1138 track->codec_priv.size -= extradata_offset;
1139 } else if (codec_id == CODEC_ID_RA_144) {
1140 track->audio.out_samplerate = 8000;
1141 track->audio.channels = 1;
1142 } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1143 codec_id == CODEC_ID_ATRAC3) {
1146 init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1147 0, NULL, NULL, NULL, NULL);
1149 track->audio.coded_framesize = get_be32(&b);
1151 track->audio.sub_packet_h = get_be16(&b);
1152 track->audio.frame_size = get_be16(&b);
1153 track->audio.sub_packet_size = get_be16(&b);
1154 track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1155 if (codec_id == CODEC_ID_RA_288) {
1156 st->codec->block_align = track->audio.coded_framesize;
1157 track->codec_priv.size = 0;
1159 st->codec->block_align = track->audio.sub_packet_size;
1160 extradata_offset = 78;
1161 track->codec_priv.size -= extradata_offset;
1165 if (codec_id == CODEC_ID_NONE)
1166 av_log(matroska->ctx, AV_LOG_INFO,
1167 "Unknown/unsupported CodecID %s.\n", track->codec_id);
1169 av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1171 st->codec->codec_id = codec_id;
1173 if (strcmp(track->language, "und"))
1174 av_strlcpy(st->language, track->language, 4);
1176 if (track->flag_default)
1177 st->disposition |= AV_DISPOSITION_DEFAULT;
1179 if (track->default_duration)
1180 av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1181 track->default_duration, 1000000000, 30000);
1184 st->codec->extradata = extradata;
1185 st->codec->extradata_size = extradata_size;
1186 } else if(track->codec_priv.data && track->codec_priv.size > 0){
1187 st->codec->extradata = av_malloc(track->codec_priv.size);
1188 if(st->codec->extradata == NULL)
1189 return AVERROR(ENOMEM);
1190 st->codec->extradata_size = track->codec_priv.size;
1191 memcpy(st->codec->extradata,
1192 track->codec_priv.data + extradata_offset,
1193 track->codec_priv.size);
1196 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1197 st->codec->codec_type = CODEC_TYPE_VIDEO;
1198 st->codec->codec_tag = track->video.fourcc;
1199 st->codec->width = track->video.pixel_width;
1200 st->codec->height = track->video.pixel_height;
1201 av_reduce(&st->codec->sample_aspect_ratio.num,
1202 &st->codec->sample_aspect_ratio.den,
1203 st->codec->height * track->video.display_width,
1204 st->codec-> width * track->video.display_height,
1206 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1207 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1208 st->codec->codec_type = CODEC_TYPE_AUDIO;
1209 st->codec->sample_rate = track->audio.out_samplerate;
1210 st->codec->channels = track->audio.channels;
1211 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1212 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1216 attachements = attachements_list->elem;
1217 for (j=0; j<attachements_list->nb_elem; j++) {
1218 if (!(attachements[j].filename && attachements[j].mime &&
1219 attachements[j].bin.data && attachements[j].bin.size > 0)) {
1220 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1222 AVStream *st = av_new_stream(s, 0);
1225 st->filename = av_strdup(attachements[j].filename);
1226 st->codec->codec_id = CODEC_ID_NONE;
1227 st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1228 st->codec->extradata = av_malloc(attachements[j].bin.size);
1229 if(st->codec->extradata == NULL)
1231 st->codec->extradata_size = attachements[j].bin.size;
1232 memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1234 for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1235 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1236 strlen(ff_mkv_mime_tags[i].str))) {
1237 st->codec->codec_id = ff_mkv_mime_tags[i].id;
1244 chapters = chapters_list->elem;
1245 for (i=0; i<chapters_list->nb_elem; i++)
1246 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1247 ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1248 chapters[i].start, chapters[i].end,
1251 index_list = &matroska->index;
1252 index = index_list->elem;
1253 for (i=0; i<index_list->nb_elem; i++) {
1254 EbmlList *pos_list = &index[i].pos;
1255 MatroskaIndexPos *pos = pos_list->elem;
1256 for (j=0; j<pos_list->nb_elem; j++) {
1257 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1259 if (track && track->stream)
1260 av_add_index_entry(track->stream,
1261 pos[j].pos + matroska->segment_start,
1262 index[i].time*matroska->time_scale/AV_TIME_BASE,
1263 0, 0, AVINDEX_KEYFRAME);
1271 * Put a packet into our internal queue. Will be delivered to the
1272 * user/application during the next get_packet() call.
1274 static void matroska_queue_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
1277 av_realloc(matroska->packets, (matroska->num_packets + 1) *
1278 sizeof(AVPacket *));
1279 matroska->packets[matroska->num_packets] = pkt;
1280 matroska->num_packets++;
1284 * Put one packet in an application-supplied AVPacket struct.
1285 * Returns 0 on success or -1 on failure.
1287 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1290 if (matroska->num_packets > 0) {
1291 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1292 av_free(matroska->packets[0]);
1293 if (matroska->num_packets > 1) {
1294 memmove(&matroska->packets[0], &matroska->packets[1],
1295 (matroska->num_packets - 1) * sizeof(AVPacket *));
1297 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1298 sizeof(AVPacket *));
1300 av_freep(&matroska->packets);
1302 matroska->num_packets--;
1310 * Free all packets in our internal queue.
1312 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1314 if (matroska->packets) {
1316 for (n = 0; n < matroska->num_packets; n++) {
1317 av_free_packet(matroska->packets[n]);
1318 av_free(matroska->packets[n]);
1320 av_free(matroska->packets);
1321 matroska->packets = NULL;
1322 matroska->num_packets = 0;
1326 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1327 int size, int64_t pos, uint64_t cluster_time,
1328 uint64_t duration, int is_keyframe)
1330 MatroskaTrack *track;
1335 uint32_t *lace_size = NULL;
1336 int n, flags, laces = 0;
1339 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1340 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1346 track = matroska_find_track_by_num(matroska, num);
1347 if (size <= 3 || !track || !track->stream) {
1348 av_log(matroska->ctx, AV_LOG_INFO,
1349 "Invalid stream %"PRIu64" or size %u\n", num, size);
1353 if (st->discard >= AVDISCARD_ALL)
1355 if (duration == AV_NOPTS_VALUE)
1356 duration = track->default_duration / matroska->time_scale;
1358 block_time = AV_RB16(data);
1362 if (is_keyframe == -1)
1363 is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1365 if (matroska->skip_to_keyframe) {
1366 if (!is_keyframe || st != matroska->skip_to_stream)
1368 matroska->skip_to_keyframe = 0;
1371 switch ((flags & 0x06) >> 1) {
1372 case 0x0: /* no lacing */
1374 lace_size = av_mallocz(sizeof(int));
1375 lace_size[0] = size;
1378 case 0x1: /* Xiph lacing */
1379 case 0x2: /* fixed-size lacing */
1380 case 0x3: /* EBML lacing */
1381 assert(size>0); // size <=3 is checked before size-=3 above
1382 laces = (*data) + 1;
1385 lace_size = av_mallocz(laces * sizeof(int));
1387 switch ((flags & 0x06) >> 1) {
1388 case 0x1: /* Xiph lacing */ {
1391 for (n = 0; res == 0 && n < laces - 1; n++) {
1398 lace_size[n] += temp;
1404 total += lace_size[n];
1406 lace_size[n] = size - total;
1410 case 0x2: /* fixed-size lacing */
1411 for (n = 0; n < laces; n++)
1412 lace_size[n] = size / laces;
1415 case 0x3: /* EBML lacing */ {
1417 n = matroska_ebmlnum_uint(matroska, data, size, &num);
1419 av_log(matroska->ctx, AV_LOG_INFO,
1420 "EBML block data error\n");
1425 total = lace_size[0] = num;
1426 for (n = 1; res == 0 && n < laces - 1; n++) {
1429 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1431 av_log(matroska->ctx, AV_LOG_INFO,
1432 "EBML block data error\n");
1437 lace_size[n] = lace_size[n - 1] + snum;
1438 total += lace_size[n];
1440 lace_size[n] = size - total;
1448 uint64_t timecode = AV_NOPTS_VALUE;
1450 if (cluster_time != (uint64_t)-1
1451 && (block_time >= 0 || cluster_time >= -block_time))
1452 timecode = cluster_time + block_time;
1454 for (n = 0; n < laces; n++) {
1455 if (st->codec->codec_id == CODEC_ID_RA_288 ||
1456 st->codec->codec_id == CODEC_ID_COOK ||
1457 st->codec->codec_id == CODEC_ID_ATRAC3) {
1458 int a = st->codec->block_align;
1459 int sps = track->audio.sub_packet_size;
1460 int cfs = track->audio.coded_framesize;
1461 int h = track->audio.sub_packet_h;
1462 int y = track->audio.sub_packet_cnt;
1463 int w = track->audio.frame_size;
1466 if (!track->audio.pkt_cnt) {
1467 if (st->codec->codec_id == CODEC_ID_RA_288)
1468 for (x=0; x<h/2; x++)
1469 memcpy(track->audio.buf+x*2*w+y*cfs,
1472 for (x=0; x<w/sps; x++)
1473 memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1475 if (++track->audio.sub_packet_cnt >= h) {
1476 track->audio.sub_packet_cnt = 0;
1477 track->audio.pkt_cnt = h*w / a;
1480 while (track->audio.pkt_cnt) {
1481 pkt = av_mallocz(sizeof(AVPacket));
1482 av_new_packet(pkt, a);
1483 memcpy(pkt->data, track->audio.buf
1484 + a * (h*w / a - track->audio.pkt_cnt--), a);
1486 pkt->stream_index = st->index;
1487 matroska_queue_packet(matroska, pkt);
1490 MatroskaTrackEncoding *encodings = track->encodings.elem;
1491 int offset = 0, pkt_size = lace_size[n];
1492 uint8_t *pkt_data = data;
1494 if (encodings && encodings->scope & 1) {
1495 offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1500 pkt = av_mallocz(sizeof(AVPacket));
1501 /* XXX: prevent data copy... */
1502 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1504 res = AVERROR(ENOMEM);
1509 memcpy (pkt->data, encodings->compression.settings.data, offset);
1510 memcpy (pkt->data+offset, pkt_data, pkt_size);
1512 if (pkt_data != data)
1516 pkt->flags = is_keyframe;
1517 pkt->stream_index = st->index;
1519 pkt->pts = timecode;
1521 pkt->duration = duration;
1523 matroska_queue_packet(matroska, pkt);
1526 if (timecode != AV_NOPTS_VALUE)
1527 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1528 data += lace_size[n];
1536 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1538 MatroskaCluster cluster = { 0 };
1539 EbmlList *blocks_list;
1540 MatroskaBlock *blocks;
1542 if (matroska->has_cluster_id){
1543 /* For the first cluster we parse, its ID was already read as
1544 part of matroska_read_header(), so don't read it again */
1545 res = ebml_parse_id(matroska, matroska_clusters,
1546 MATROSKA_ID_CLUSTER, &cluster);
1547 matroska->has_cluster_id = 0;
1549 res = ebml_parse(matroska, matroska_clusters, &cluster);
1550 blocks_list = &cluster.blocks;
1551 blocks = blocks_list->elem;
1552 for (i=0; !res && i<blocks_list->nb_elem; i++)
1553 if (blocks[i].bin.size > 0)
1554 res=matroska_parse_block(matroska,
1555 blocks[i].bin.data, blocks[i].bin.size,
1556 blocks[i].bin.pos, cluster.timecode,
1557 blocks[i].duration, !blocks[i].reference);
1558 ebml_free(matroska_cluster, &cluster);
1562 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1564 MatroskaDemuxContext *matroska = s->priv_data;
1566 while (matroska_deliver_packet(matroska, pkt)) {
1568 return AVERROR(EIO);
1569 if (matroska_parse_cluster(matroska) < 0)
1576 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1577 int64_t timestamp, int flags)
1579 MatroskaDemuxContext *matroska = s->priv_data;
1580 AVStream *st = s->streams[stream_index];
1583 index = av_index_search_timestamp(st, timestamp, flags);
1587 matroska_clear_queue(matroska);
1589 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
1590 matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1591 matroska->skip_to_stream = st;
1592 av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1596 static int matroska_read_close(AVFormatContext *s)
1598 MatroskaDemuxContext *matroska = s->priv_data;
1599 MatroskaTrack *tracks = matroska->tracks.elem;
1602 matroska_clear_queue(matroska);
1604 for (n=0; n < matroska->tracks.nb_elem; n++)
1605 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1606 av_free(tracks[n].audio.buf);
1607 ebml_free(matroska_segment, matroska);
1612 AVInputFormat matroska_demuxer = {
1614 NULL_IF_CONFIG_SMALL("Matroska file format"),
1615 sizeof(MatroskaDemuxContext),
1617 matroska_read_header,
1618 matroska_read_packet,
1619 matroska_read_close,