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[libav.git] / libavformat / matroska.c
1 /*
2 * Matroska file demuxer (no muxer yet)
3 * Copyright (c) 2003-2004 The ffmpeg Project
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 /**
21 * @file matroska.c
22 * Matroska file demuxer
23 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
24 * with a little help from Moritz Bunkus <moritz@bunkus.org>
25 * Specs available on the matroska project page:
26 * http://www.matroska.org/.
27 */
28
29 #include "avformat.h"
30 /* For codec_get_bmp_id and codec_get_wav_id. */
31 #include "avi.h"
32
33 /* EBML version supported */
34 #define EBML_VERSION 1
35
36 /* top-level master-IDs */
37 #define EBML_ID_HEADER 0x1A45DFA3
38
39 /* IDs in the HEADER master */
40 #define EBML_ID_EBMLVERSION 0x4286
41 #define EBML_ID_EBMLREADVERSION 0x42F7
42 #define EBML_ID_EBMLMAXIDLENGTH 0x42F2
43 #define EBML_ID_EBMLMAXSIZELENGTH 0x42F3
44 #define EBML_ID_DOCTYPE 0x4282
45 #define EBML_ID_DOCTYPEVERSION 0x4287
46 #define EBML_ID_DOCTYPEREADVERSION 0x4285
47
48 /* general EBML types */
49 #define EBML_ID_VOID 0xEC
50
51 /*
52 * Matroska element IDs. max. 32-bit.
53 */
54
55 /* toplevel segment */
56 #define MATROSKA_ID_SEGMENT 0x18538067
57
58 /* matroska top-level master IDs */
59 #define MATROSKA_ID_INFO 0x1549A966
60 #define MATROSKA_ID_TRACKS 0x1654AE6B
61 #define MATROSKA_ID_CUES 0x1C53BB6B
62 #define MATROSKA_ID_TAGS 0x1254C367
63 #define MATROSKA_ID_SEEKHEAD 0x114D9B74
64 #define MATROSKA_ID_CLUSTER 0x1F43B675
65
66 /* IDs in the info master */
67 #define MATROSKA_ID_TIMECODESCALE 0x2AD7B1
68 #define MATROSKA_ID_DURATION 0x4489
69 #define MATROSKA_ID_WRITINGAPP 0x5741
70 #define MATROSKA_ID_MUXINGAPP 0x4D80
71 #define MATROSKA_ID_DATEUTC 0x4461
72
73 /* ID in the tracks master */
74 #define MATROSKA_ID_TRACKENTRY 0xAE
75
76 /* IDs in the trackentry master */
77 #define MATROSKA_ID_TRACKNUMBER 0xD7
78 #define MATROSKA_ID_TRACKUID 0x73C5
79 #define MATROSKA_ID_TRACKTYPE 0x83
80 #define MATROSKA_ID_TRACKAUDIO 0xE1
81 #define MATROSKA_ID_TRACKVIDEO 0xE0
82 #define MATROSKA_ID_CODECID 0x86
83 #define MATROSKA_ID_CODECPRIVATE 0x63A2
84 #define MATROSKA_ID_CODECNAME 0x258688
85 #define MATROSKA_ID_CODECINFOURL 0x3B4040
86 #define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
87 #define MATROSKA_ID_TRACKNAME 0x536E
88 #define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
89 #define MATROSKA_ID_TRACKFLAGENABLED 0xB9
90 #define MATROSKA_ID_TRACKFLAGDEFAULT 0x88
91 #define MATROSKA_ID_TRACKFLAGLACING 0x9C
92 #define MATROSKA_ID_TRACKMINCACHE 0x6DE7
93 #define MATROSKA_ID_TRACKMAXCACHE 0x6DF8
94 #define MATROSKA_ID_TRACKDEFAULTDURATION 0x23E383
95
96 /* IDs in the trackvideo master */
97 #define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
98 #define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0
99 #define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
100 #define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
101 #define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
102 #define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
103 #define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
104 #define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
105 #define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
106
107 /* IDs in the trackaudio master */
108 #define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
109 #define MATROSKA_ID_AUDIOBITDEPTH 0x6264
110 #define MATROSKA_ID_AUDIOCHANNELS 0x9F
111
112 /* ID in the cues master */
113 #define MATROSKA_ID_POINTENTRY 0xBB
114
115 /* IDs in the pointentry master */
116 #define MATROSKA_ID_CUETIME 0xB3
117 #define MATROSKA_ID_CUETRACKPOSITION 0xB7
118
119 /* IDs in the cuetrackposition master */
120 #define MATROSKA_ID_CUETRACK 0xF7
121 #define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
122
123 /* IDs in the tags master */
124 /* TODO */
125
126 /* IDs in the seekhead master */
127 #define MATROSKA_ID_SEEKENTRY 0x4DBB
128
129 /* IDs in the seekpoint master */
130 #define MATROSKA_ID_SEEKID 0x53AB
131 #define MATROSKA_ID_SEEKPOSITION 0x53AC
132
133 /* IDs in the cluster master */
134 #define MATROSKA_ID_CLUSTERTIMECODE 0xE7
135 #define MATROSKA_ID_BLOCKGROUP 0xA0
136
137 /* IDs in the blockgroup master */
138 #define MATROSKA_ID_BLOCK 0xA1
139 #define MATROSKA_ID_BLOCKDURATION 0x9B
140 #define MATROSKA_ID_BLOCKREFERENCE 0xFB
141
142 typedef enum {
143 MATROSKA_TRACK_TYPE_VIDEO = 0x1,
144 MATROSKA_TRACK_TYPE_AUDIO = 0x2,
145 MATROSKA_TRACK_TYPE_COMPLEX = 0x3,
146 MATROSKA_TRACK_TYPE_LOGO = 0x10,
147 MATROSKA_TRACK_TYPE_SUBTITLE = 0x11,
148 MATROSKA_TRACK_TYPE_CONTROL = 0x20,
149 } MatroskaTrackType;
150
151 typedef enum {
152 MATROSKA_EYE_MODE_MONO = 0x0,
153 MATROSKA_EYE_MODE_RIGHT = 0x1,
154 MATROSKA_EYE_MODE_LEFT = 0x2,
155 MATROSKA_EYE_MODE_BOTH = 0x3,
156 } MatroskaEyeMode;
157
158 typedef enum {
159 MATROSKA_ASPECT_RATIO_MODE_FREE = 0x0,
160 MATROSKA_ASPECT_RATIO_MODE_KEEP = 0x1,
161 MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
162 } MatroskaAspectRatioMode;
163
164 /*
165 * These aren't in any way "matroska-form" things,
166 * it's just something I use in the muxer/demuxer.
167 */
168
169 typedef enum {
170 MATROSKA_TRACK_ENABLED = (1<<0),
171 MATROSKA_TRACK_DEFAULT = (1<<1),
172 MATROSKA_TRACK_LACING = (1<<2),
173 MATROSKA_TRACK_SHIFT = (1<<16)
174 } MatroskaTrackFlags;
175
176 typedef enum {
177 MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
178 } MatroskaVideoTrackFlags;
179
180 /*
181 * Matroska Codec IDs. Strings.
182 */
183
184 #define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC "V_MS/VFW/FOURCC"
185 #define MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED "V_UNCOMPRESSED"
186 #define MATROSKA_CODEC_ID_VIDEO_MPEG4_SP "V_MPEG4/ISO/SP"
187 #define MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP "V_MPEG4/ISO/ASP"
188 #define MATROSKA_CODEC_ID_VIDEO_MPEG4_AP "V_MPEG4/ISO/AP"
189 #define MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC "V_MPEG4/ISO/AVC"
190 #define MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3 "V_MPEG4/MS/V3"
191 #define MATROSKA_CODEC_ID_VIDEO_MPEG1 "V_MPEG1"
192 #define MATROSKA_CODEC_ID_VIDEO_MPEG2 "V_MPEG2"
193 #define MATROSKA_CODEC_ID_VIDEO_MJPEG "V_MJPEG"
194 /* TODO: Real/Quicktime */
195
196 #define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM"
197 #define MATROSKA_CODEC_ID_AUDIO_MPEG1_L1 "A_MPEG/L1"
198 #define MATROSKA_CODEC_ID_AUDIO_MPEG1_L2 "A_MPEG/L2"
199 #define MATROSKA_CODEC_ID_AUDIO_MPEG1_L3 "A_MPEG/L3"
200 #define MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE "A_PCM/INT/BIG"
201 #define MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE "A_PCM/INT/LIT"
202 #define MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT "A_PCM/FLOAT/IEEE"
203 #define MATROSKA_CODEC_ID_AUDIO_AC3 "A_AC3"
204 #define MATROSKA_CODEC_ID_AUDIO_DTS "A_DTS"
205 #define MATROSKA_CODEC_ID_AUDIO_VORBIS "A_VORBIS"
206 #define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM"
207 #define MATROSKA_CODEC_ID_AUDIO_MPEG2 "A_AAC/MPEG2/"
208 #define MATROSKA_CODEC_ID_AUDIO_MPEG4 "A_AAC/MPEG4/"
209 /* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
210
211 /* max. depth in the EBML tree structure */
212 #define EBML_MAX_DEPTH 16
213
214 typedef struct Track {
215 MatroskaTrackType type;
216
217 /* Unique track number and track ID. stream_index is the index that
218 * the calling app uses for this track. */
219 uint32_t num,
220 uid,
221 stream_index;
222
223 char *name,
224 *language;
225
226 char *codec_id,
227 *codec_name;
228
229 unsigned char *codec_priv;
230 int codec_priv_size;
231
232 int64_t default_duration;
233 MatroskaTrackFlags flags;
234 } MatroskaTrack;
235
236 typedef struct MatroskaVideoTrack {
237 MatroskaTrack track;
238
239 int pixel_width,
240 pixel_height,
241 display_width,
242 display_height;
243
244 uint32_t fourcc;
245
246 MatroskaAspectRatioMode ar_mode;
247 MatroskaEyeMode eye_mode;
248
249 //..
250 } MatroskaVideoTrack;
251
252 typedef struct MatroskaAudioTrack {
253 MatroskaTrack track;
254
255 int channels,
256 bitdepth,
257 samplerate;
258 //..
259 } MatroskaAudioTrack;
260
261 typedef struct MatroskaSubtitleTrack {
262 MatroskaTrack track;
263
264 //..
265 } MatroskaSubtitleTrack;
266
267 typedef struct MatroskaLevel {
268 uint64_t start, length;
269 } MatroskaLevel;
270
271 typedef struct MatroskaDemuxIndex {
272 uint64_t pos; /* of the corresponding *cluster*! */
273 uint16_t track; /* reference to 'num' */
274 uint64_t time; /* in nanoseconds */
275 } MatroskaDemuxIndex;
276
277 typedef struct MatroskaDemuxContext {
278 AVFormatContext *ctx;
279
280 /* ebml stuff */
281 int num_levels;
282 MatroskaLevel levels[EBML_MAX_DEPTH];
283 int level_up;
284
285 /* matroska stuff */
286 char *writing_app,
287 *muxing_app;
288 int64_t created;
289
290 /* timescale in the file */
291 int64_t time_scale;
292
293 /* length, position (time, ns) */
294 int64_t duration,
295 pos;
296
297 /* num_streams is the number of streams that av_new_stream() was called
298 * for ( = that are available to the calling program). */
299 int num_tracks, num_streams;
300 MatroskaTrack *tracks[MAX_STREAMS];
301
302 /* cache for ID peeking */
303 uint32_t peek_id;
304
305 /* byte position of the segment inside the stream */
306 offset_t segment_start;
307
308 /* The packet queue. */
309 AVPacket **packets;
310 int num_packets;
311
312 /* have we already parse metadata/cues/clusters? */
313 int metadata_parsed,
314 index_parsed,
315 done;
316
317 /* The index for seeking. */
318 int num_indexes;
319 MatroskaDemuxIndex *index;
320 } MatroskaDemuxContext;
321
322 /*
323 * The first few functions handle EBML file parsing. The rest
324 * is the document interpretation. Matroska really just is a
325 * EBML file.
326 */
327
328 /*
329 * Return: the amount of levels in the hierarchy that the
330 * current element lies higher than the previous one.
331 * The opposite isn't done - that's auto-done using master
332 * element reading.
333 */
334
335 static int
336 ebml_read_element_level_up (MatroskaDemuxContext *matroska)
337 {
338 ByteIOContext *pb = &matroska->ctx->pb;
339 offset_t pos = url_ftell(pb);
340 int num = 0;
341
342 while (matroska->num_levels > 0) {
343 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
344
345 if (pos >= level->start + level->length) {
346 matroska->num_levels--;
347 num++;
348 } else {
349 break;
350 }
351 }
352
353 return num;
354 }
355
356 /*
357 * Read: an "EBML number", which is defined as a variable-length
358 * array of bytes. The first byte indicates the length by giving a
359 * number of 0-bits followed by a one. The position of the first
360 * "one" bit inside the first byte indicates the length of this
361 * number.
362 * Returns: num. of bytes read. < 0 on error.
363 */
364
365 static int
366 ebml_read_num (MatroskaDemuxContext *matroska,
367 int max_size,
368 uint64_t *number)
369 {
370 ByteIOContext *pb = &matroska->ctx->pb;
371 int len_mask = 0x80, read = 1, n = 1;
372 int64_t total = 0;
373
374 /* the first byte tells us the length in bytes - get_byte() can normally
375 * return 0, but since that's not a valid first ebmlID byte, we can
376 * use it safely here to catch EOS. */
377 if (!(total = get_byte(pb))) {
378 /* we might encounter EOS here */
379 if (!url_feof(pb)) {
380 offset_t pos = url_ftell(pb);
381 av_log(matroska->ctx, AV_LOG_ERROR,
382 "Read error at pos. %llu (0x%llx)\n",
383 pos, pos);
384 }
385 return AVERROR_IO; /* EOS or actual I/O error */
386 }
387
388 /* get the length of the EBML number */
389 while (read <= max_size && !(total & len_mask)) {
390 read++;
391 len_mask >>= 1;
392 }
393 if (read > max_size) {
394 offset_t pos = url_ftell(pb) - 1;
395 av_log(matroska->ctx, AV_LOG_ERROR,
396 "Invalid EBML number size tag 0x%02x at pos %llu (0x%llx)\n",
397 (uint8_t) total, pos, pos);
398 return AVERROR_INVALIDDATA;
399 }
400
401 /* read out length */
402 total &= ~len_mask;
403 while (n++ < read)
404 total = (total << 8) | get_byte(pb);
405
406 *number = total;
407
408 return read;
409 }
410
411 /*
412 * Read: the element content data ID.
413 * Return: the number of bytes read or < 0 on error.
414 */
415
416 static int
417 ebml_read_element_id (MatroskaDemuxContext *matroska,
418 uint32_t *id,
419 int *level_up)
420 {
421 int read;
422 uint64_t total;
423
424 /* if we re-call this, use our cached ID */
425 if (matroska->peek_id != 0) {
426 if (level_up)
427 *level_up = 0;
428 *id = matroska->peek_id;
429 return 0;
430 }
431
432 /* read out the "EBML number", include tag in ID */
433 if ((read = ebml_read_num(matroska, 4, &total)) < 0)
434 return read;
435 *id = matroska->peek_id = total | (1 << (read * 7));
436
437 /* level tracking */
438 if (level_up)
439 *level_up = ebml_read_element_level_up(matroska);
440
441 return read;
442 }
443
444 /*
445 * Read: element content length.
446 * Return: the number of bytes read or < 0 on error.
447 */
448
449 static int
450 ebml_read_element_length (MatroskaDemuxContext *matroska,
451 uint64_t *length)
452 {
453 /* clear cache since we're now beyond that data point */
454 matroska->peek_id = 0;
455
456 /* read out the "EBML number", include tag in ID */
457 return ebml_read_num(matroska, 8, length);
458 }
459
460 /*
461 * Return: the ID of the next element, or 0 on error.
462 * Level_up contains the amount of levels that this
463 * next element lies higher than the previous one.
464 */
465
466 static uint32_t
467 ebml_peek_id (MatroskaDemuxContext *matroska,
468 int *level_up)
469 {
470 uint32_t id;
471
472 assert(level_up != NULL);
473
474 if (ebml_read_element_id(matroska, &id, level_up) < 0)
475 return 0;
476
477 return id;
478 }
479
480 /*
481 * Seek to a given offset.
482 * 0 is success, -1 is failure.
483 */
484
485 static int
486 ebml_read_seek (MatroskaDemuxContext *matroska,
487 offset_t offset)
488 {
489 ByteIOContext *pb = &matroska->ctx->pb;
490
491 /* clear ID cache, if any */
492 matroska->peek_id = 0;
493
494 return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
495 }
496
497 /*
498 * Skip the next element.
499 * 0 is success, -1 is failure.
500 */
501
502 static int
503 ebml_read_skip (MatroskaDemuxContext *matroska)
504 {
505 ByteIOContext *pb = &matroska->ctx->pb;
506 uint32_t id;
507 uint64_t length;
508 int res;
509
510 if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
511 (res = ebml_read_element_length(matroska, &length)) < 0)
512 return res;
513
514 url_fskip(pb, length);
515
516 return 0;
517 }
518
519 /*
520 * Read the next element as an unsigned int.
521 * 0 is success, < 0 is failure.
522 */
523
524 static int
525 ebml_read_uint (MatroskaDemuxContext *matroska,
526 uint32_t *id,
527 uint64_t *num)
528 {
529 ByteIOContext *pb = &matroska->ctx->pb;
530 int n = 0, size, res;
531 uint64_t rlength;
532
533 if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
534 (res = ebml_read_element_length(matroska, &rlength)) < 0)
535 return res;
536 size = rlength;
537 if (size < 1 || size > 8) {
538 offset_t pos = url_ftell(pb);
539 av_log(matroska->ctx, AV_LOG_ERROR,
540 "Invalid uint element size %d at position %lld (0x%llx)\n",
541 size, pos, pos);
542 return AVERROR_INVALIDDATA;
543 }
544
545 /* big-endian ordening; build up number */
546 *num = 0;
547 while (n++ < size)
548 *num = (*num << 8) | get_byte(pb);
549
550 return 0;
551 }
552
553 /*
554 * Read the next element as a signed int.
555 * 0 is success, < 0 is failure.
556 */
557
558 static int
559 ebml_read_sint (MatroskaDemuxContext *matroska,
560 uint32_t *id,
561 int64_t *num)
562 {
563 ByteIOContext *pb = &matroska->ctx->pb;
564 int size, n = 1, negative = 0, res;
565 uint64_t rlength;
566
567 if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
568 (res = ebml_read_element_length(matroska, &rlength)) < 0)
569 return res;
570 size = rlength;
571 if (size < 1 || size > 8) {
572 offset_t pos = url_ftell(pb);
573 av_log(matroska->ctx, AV_LOG_ERROR,
574 "Invalid sint element size %d at position %lld (0x%llx)\n",
575 size, pos, pos);
576 return AVERROR_INVALIDDATA;
577 }
578 if ((*num = get_byte(pb)) & 0x80) {
579 negative = 1;
580 *num &= ~0x80;
581 }
582 *num = 0;
583 while (n++ < size)
584 *num = (*num << 8) | get_byte(pb);
585
586 /* make signed */
587 if (negative)
588 *num = *num - (1LL << ((8 * size) - 1));
589
590 return 0;
591 }
592
593 /*
594 * Read the next element as a float.
595 * 0 is success, < 0 is failure.
596 */
597
598 static int
599 ebml_read_float (MatroskaDemuxContext *matroska,
600 uint32_t *id,
601 double *num)
602 {
603 ByteIOContext *pb = &matroska->ctx->pb;
604 int size, res;
605 uint64_t rlength;
606
607 if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
608 (res = ebml_read_element_length(matroska, &rlength)) < 0)
609 return res;
610 size = rlength;
611
612 if (size != 4 && size != 8 && size != 10) {
613 offset_t pos = url_ftell(pb);
614 av_log(matroska->ctx, AV_LOG_ERROR,
615 "Invalid float element size %d at position %llu (0x%llx)\n",
616 size, pos, pos);
617 return AVERROR_INVALIDDATA;
618 }
619 if (size == 10) {
620 av_log(matroska->ctx, AV_LOG_ERROR,
621 "FIXME! 10-byte floats unimplemented\n");
622 return AVERROR_UNKNOWN;
623 }
624
625 if (size == 4) {
626 float f;
627
628 while (size-- > 0)
629 #ifdef WORDS_BIGENDIAN
630 ((uint8_t *) &f)[3 - size] = get_byte(pb);
631 #else
632 ((uint8_t *) &f)[size] = get_byte(pb);
633 #endif
634
635 *num = f;
636 } else {
637 double d;
638
639 while (size-- > 0)
640 #ifdef WORDS_BIGENDIAN
641 ((uint8_t *) &d)[7 - size] = get_byte(pb);
642 #else
643 ((uint8_t *) &d)[size] = get_byte(pb);
644 #endif
645
646 *num = d;
647 }
648
649 return 0;
650 }
651
652 /*
653 * Read the next element as an ASCII string.
654 * 0 is success, < 0 is failure.
655 */
656
657 static int
658 ebml_read_ascii (MatroskaDemuxContext *matroska,
659 uint32_t *id,
660 char **str)
661 {
662 ByteIOContext *pb = &matroska->ctx->pb;
663 int size, res;
664 uint64_t rlength;
665
666 if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
667 (res = ebml_read_element_length(matroska, &rlength)) < 0)
668 return res;
669 size = rlength;
670
671 /* ebml strings are usually not 0-terminated, so we allocate one
672 * byte more, read the string and NULL-terminate it ourselves. */
673 if (size < 0 || !(*str = av_malloc(size + 1))) {
674 av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
675 return AVERROR_NOMEM;
676 }
677 if (get_buffer(pb, (uint8_t *) *str, size) != size) {
678 offset_t pos = url_ftell(pb);
679 av_log(matroska->ctx, AV_LOG_ERROR,
680 "Read error at pos. %llu (0x%llx)\n", pos, pos);
681 return AVERROR_IO;
682 }
683 (*str)[size] = '\0';
684
685 return 0;
686 }
687
688 /*
689 * Read the next element as a UTF-8 string.
690 * 0 is success, < 0 is failure.
691 */
692
693 static int
694 ebml_read_utf8 (MatroskaDemuxContext *matroska,
695 uint32_t *id,
696 char **str)
697 {
698 return ebml_read_ascii(matroska, id, str);
699 }
700
701 /*
702 * Read the next element as a date (nanoseconds since 1/1/2000).
703 * 0 is success, < 0 is failure.
704 */
705
706 static int
707 ebml_read_date (MatroskaDemuxContext *matroska,
708 uint32_t *id,
709 int64_t *date)
710 {
711 return ebml_read_sint(matroska, id, date);
712 }
713
714 /*
715 * Read the next element, but only the header. The contents
716 * are supposed to be sub-elements which can be read separately.
717 * 0 is success, < 0 is failure.
718 */
719
720 static int
721 ebml_read_master (MatroskaDemuxContext *matroska,
722 uint32_t *id)
723 {
724 ByteIOContext *pb = &matroska->ctx->pb;
725 uint64_t length;
726 MatroskaLevel *level;
727 int res;
728
729 if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
730 (res = ebml_read_element_length(matroska, &length)) < 0)
731 return res;
732
733 /* protect... (Heaven forbids that the '>' is true) */
734 if (matroska->num_levels >= EBML_MAX_DEPTH) {
735 av_log(matroska->ctx, AV_LOG_ERROR,
736 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
737 return AVERROR_NOTSUPP;
738 }
739
740 /* remember level */
741 level = &matroska->levels[matroska->num_levels++];
742 level->start = url_ftell(pb);
743 level->length = length;
744
745 return 0;
746 }
747
748 /*
749 * Read the next element as binary data.
750 * 0 is success, < 0 is failure.
751 */
752
753 static int
754 ebml_read_binary (MatroskaDemuxContext *matroska,
755 uint32_t *id,
756 uint8_t **binary,
757 int *size)
758 {
759 ByteIOContext *pb = &matroska->ctx->pb;
760 uint64_t rlength;
761 int res;
762
763 if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
764 (res = ebml_read_element_length(matroska, &rlength)) < 0)
765 return res;
766 *size = rlength;
767
768 if (!(*binary = av_malloc(*size))) {
769 av_log(matroska->ctx, AV_LOG_ERROR,
770 "Memory allocation error\n");
771 return AVERROR_NOMEM;
772 }
773
774 if (get_buffer(pb, *binary, *size) != *size) {
775 offset_t pos = url_ftell(pb);
776 av_log(matroska->ctx, AV_LOG_ERROR,
777 "Read error at pos. %llu (0x%llx)\n", pos, pos);
778 return AVERROR_IO;
779 }
780
781 return 0;
782 }
783
784 /*
785 * Read signed/unsigned "EBML" numbers.
786 * Return: number of bytes processed, < 0 on error.
787 * XXX: use ebml_read_num().
788 */
789
790 static int
791 matroska_ebmlnum_uint (uint8_t *data,
792 uint32_t size,
793 uint64_t *num)
794 {
795 int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
796 uint64_t total;
797
798 if (size <= 0)
799 return AVERROR_INVALIDDATA;
800
801 total = data[0];
802 while (read <= 8 && !(total & len_mask)) {
803 read++;
804 len_mask >>= 1;
805 }
806 if (read > 8)
807 return AVERROR_INVALIDDATA;
808
809 if ((total &= (len_mask - 1)) == len_mask - 1)
810 num_ffs++;
811 if (size < read)
812 return AVERROR_INVALIDDATA;
813 while (n < read) {
814 if (data[n] == 0xff)
815 num_ffs++;
816 total = (total << 8) | data[n];
817 n++;
818 }
819
820 if (!total)
821 return AVERROR_INVALIDDATA;
822
823 if (read == num_ffs)
824 *num = (uint64_t)-1;
825 else
826 *num = total;
827
828 return read;
829 }
830
831 /*
832 * Same as above, but signed.
833 */
834
835 static int
836 matroska_ebmlnum_sint (uint8_t *data,
837 uint32_t size,
838 int64_t *num)
839 {
840 uint64_t unum;
841 int res;
842
843 /* read as unsigned number first */
844 if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
845 return res;
846
847 /* make signed (weird way) */
848 if (unum == (uint64_t)-1)
849 *num = INT64_MAX;
850 else
851 *num = unum - ((1LL << ((7 * res) - 1)) - 1);
852
853 return res;
854 }
855
856 /*
857 * Read an EBML header.
858 * 0 is success, < 0 is failure.
859 */
860
861 static int
862 ebml_read_header (MatroskaDemuxContext *matroska,
863 char **doctype,
864 int *version)
865 {
866 uint32_t id;
867 int level_up, res = 0;
868
869 /* default init */
870 if (doctype)
871 *doctype = NULL;
872 if (version)
873 *version = 1;
874
875 if (!(id = ebml_peek_id(matroska, &level_up)) ||
876 level_up != 0 || id != EBML_ID_HEADER) {
877 av_log(matroska->ctx, AV_LOG_ERROR,
878 "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
879 return AVERROR_INVALIDDATA;
880 }
881 if ((res = ebml_read_master(matroska, &id)) < 0)
882 return res;
883
884 while (res == 0) {
885 if (!(id = ebml_peek_id(matroska, &level_up)))
886 return AVERROR_IO;
887
888 /* end-of-header */
889 if (level_up)
890 break;
891
892 switch (id) {
893 /* is our read version uptodate? */
894 case EBML_ID_EBMLREADVERSION: {
895 uint64_t num;
896
897 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
898 return res;
899 if (num > EBML_VERSION) {
900 av_log(matroska->ctx, AV_LOG_ERROR,
901 "EBML version %llu (> %d) is not supported\n",
902 num, EBML_VERSION);
903 return AVERROR_INVALIDDATA;
904 }
905 break;
906 }
907
908 /* we only handle 8 byte lengths at max */
909 case EBML_ID_EBMLMAXSIZELENGTH: {
910 uint64_t num;
911
912 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
913 return res;
914 if (num > sizeof(uint64_t)) {
915 av_log(matroska->ctx, AV_LOG_ERROR,
916 "Integers of size %llu (> %d) not supported\n",
917 num, sizeof(uint64_t));
918 return AVERROR_INVALIDDATA;
919 }
920 break;
921 }
922
923 /* we handle 4 byte IDs at max */
924 case EBML_ID_EBMLMAXIDLENGTH: {
925 uint64_t num;
926
927 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
928 return res;
929 if (num > sizeof(uint32_t)) {
930 av_log(matroska->ctx, AV_LOG_ERROR,
931 "IDs of size %llu (> %u) not supported\n",
932 num, sizeof(uint32_t));
933 return AVERROR_INVALIDDATA;
934 }
935 break;
936 }
937
938 case EBML_ID_DOCTYPE: {
939 char *text;
940
941 if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
942 return res;
943 if (doctype) {
944 if (*doctype)
945 av_free(*doctype);
946 *doctype = text;
947 } else
948 av_free(text);
949 break;
950 }
951
952 case EBML_ID_DOCTYPEREADVERSION: {
953 uint64_t num;
954
955 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
956 return res;
957 if (version)
958 *version = num;
959 break;
960 }
961
962 default:
963 av_log(matroska->ctx, AV_LOG_INFO,
964 "Unknown data type 0x%x in EBML header", id);
965 /* pass-through */
966
967 case EBML_ID_VOID:
968 /* we ignore these two, as they don't tell us anything we
969 * care about */
970 case EBML_ID_EBMLVERSION:
971 case EBML_ID_DOCTYPEVERSION:
972 res = ebml_read_skip (matroska);
973 break;
974 }
975 }
976
977 return 0;
978 }
979
980 /*
981 * Put one packet in an application-supplied AVPacket struct.
982 * Returns 0 on success or -1 on failure.
983 */
984
985 static int
986 matroska_deliver_packet (MatroskaDemuxContext *matroska,
987 AVPacket *pkt)
988 {
989 if (matroska->num_packets > 0) {
990 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
991 av_free(matroska->packets[0]);
992 if (matroska->num_packets > 1) {
993 memmove(&matroska->packets[0], &matroska->packets[1],
994 (matroska->num_packets - 1) * sizeof(AVPacket *));
995 matroska->packets =
996 av_realloc(matroska->packets, (matroska->num_packets - 1) *
997 sizeof(AVPacket *));
998 } else {
999 av_free(matroska->packets);
1000 matroska->packets = NULL;
1001 }
1002 matroska->num_packets--;
1003 return 0;
1004 }
1005
1006 return -1;
1007 }
1008
1009 /*
1010 * Put a packet into our internal queue. Will be delivered to the
1011 * user/application during the next get_packet() call.
1012 */
1013
1014 static void
1015 matroska_queue_packet (MatroskaDemuxContext *matroska,
1016 AVPacket *pkt)
1017 {
1018 matroska->packets =
1019 av_realloc(matroska->packets, (matroska->num_packets + 1) *
1020 sizeof(AVPacket *));
1021 matroska->packets[matroska->num_packets] = pkt;
1022 matroska->num_packets++;
1023 }
1024
1025 /*
1026 * Autodetecting...
1027 */
1028
1029 static int
1030 matroska_probe (AVProbeData *p)
1031 {
1032 uint64_t total = 0;
1033 int len_mask = 0x80, size = 1, n = 1;
1034 uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1035
1036 if (p->buf_size < 5)
1037 return 0;
1038
1039 /* ebml header? */
1040 if ((p->buf[0] << 24 | p->buf[1] << 16 |
1041 p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1042 return 0;
1043
1044 /* length of header */
1045 total = p->buf[4];
1046 while (size <= 8 && !(total & len_mask)) {
1047 size++;
1048 len_mask >>= 1;
1049 }
1050 if (size > 8)
1051 return 0;
1052 total &= (len_mask - 1);
1053 while (n < size)
1054 total = (total << 8) | p->buf[4 + n++];
1055
1056 /* does the probe data contain the whole header? */
1057 if (p->buf_size < 4 + size + total)
1058 return 0;
1059
1060 /* the header must contain the document type 'matroska'. For now,
1061 * we don't parse the whole header but simply check for the
1062 * availability of that array of characters inside the header.
1063 * Not fully fool-proof, but good enough. */
1064 for (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++)
1065 if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1066 return AVPROBE_SCORE_MAX;
1067
1068 return 0;
1069 }
1070
1071 /*
1072 * From here on, it's all XML-style DTD stuff... Needs no comments.
1073 */
1074
1075 static int
1076 matroska_parse_info (MatroskaDemuxContext *matroska)
1077 {
1078 int res = 0;
1079 uint32_t id;
1080
1081 av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1082
1083 while (res == 0) {
1084 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1085 res = AVERROR_IO;
1086 break;
1087 } else if (matroska->level_up) {
1088 matroska->level_up--;
1089 break;
1090 }
1091
1092 switch (id) {
1093 /* cluster timecode */
1094 case MATROSKA_ID_TIMECODESCALE: {
1095 uint64_t num;
1096 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1097 break;
1098 matroska->time_scale = num;
1099 break;
1100 }
1101
1102 case MATROSKA_ID_DURATION: {
1103 double num;
1104 if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1105 break;
1106 matroska->duration = num * matroska->time_scale;
1107 break;
1108 }
1109
1110 case MATROSKA_ID_WRITINGAPP: {
1111 char *text;
1112 if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1113 break;
1114 matroska->writing_app = text;
1115 break;
1116 }
1117
1118 case MATROSKA_ID_MUXINGAPP: {
1119 char *text;
1120 if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1121 break;
1122 matroska->muxing_app = text;
1123 break;
1124 }
1125
1126 case MATROSKA_ID_DATEUTC: {
1127 int64_t time;
1128 if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1129 break;
1130 matroska->created = time;
1131 break;
1132 }
1133
1134 default:
1135 av_log(matroska->ctx, AV_LOG_INFO,
1136 "Unknown entry 0x%x in info header\n", id);
1137 /* fall-through */
1138
1139 case EBML_ID_VOID:
1140 res = ebml_read_skip(matroska);
1141 break;
1142 }
1143
1144 if (matroska->level_up) {
1145 matroska->level_up--;
1146 break;
1147 }
1148 }
1149
1150 return res;
1151 }
1152
1153 static int
1154 matroska_add_stream (MatroskaDemuxContext *matroska)
1155 {
1156 int res = 0;
1157 uint32_t id;
1158 MatroskaTrack *track;
1159
1160 av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1161
1162 /* Allocate a generic track. As soon as we know its type we'll realloc. */
1163 track = av_mallocz(sizeof(MatroskaTrack));
1164 matroska->num_tracks++;
1165
1166 /* start with the master */
1167 if ((res = ebml_read_master(matroska, &id)) < 0)
1168 return res;
1169
1170 /* try reading the trackentry headers */
1171 while (res == 0) {
1172 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1173 res = AVERROR_IO;
1174 break;
1175 } else if (matroska->level_up > 0) {
1176 matroska->level_up--;
1177 break;
1178 }
1179
1180 switch (id) {
1181 /* track number (unique stream ID) */
1182 case MATROSKA_ID_TRACKNUMBER: {
1183 uint64_t num;
1184 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1185 break;
1186 track->num = num;
1187 break;
1188 }
1189
1190 /* track UID (unique identifier) */
1191 case MATROSKA_ID_TRACKUID: {
1192 uint64_t num;
1193 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1194 break;
1195 track->uid = num;
1196 break;
1197 }
1198
1199 /* track type (video, audio, combined, subtitle, etc.) */
1200 case MATROSKA_ID_TRACKTYPE: {
1201 uint64_t num;
1202 if (track->type != 0) {
1203 av_log(matroska->ctx, AV_LOG_INFO,
1204 "More than one tracktype in an entry - skip\n");
1205 break;
1206 }
1207 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1208 break;
1209 track->type = num;
1210
1211 /* ok, so we're actually going to reallocate this thing */
1212 switch (track->type) {
1213 case MATROSKA_TRACK_TYPE_VIDEO:
1214 track = (MatroskaTrack *)
1215 av_realloc(track, sizeof(MatroskaVideoTrack));
1216 break;
1217 case MATROSKA_TRACK_TYPE_AUDIO:
1218 track = (MatroskaTrack *)
1219 av_realloc(track, sizeof(MatroskaAudioTrack));
1220 ((MatroskaAudioTrack *)track)->channels = 1;
1221 ((MatroskaAudioTrack *)track)->samplerate = 8000;
1222 break;
1223 case MATROSKA_TRACK_TYPE_SUBTITLE:
1224 track = (MatroskaTrack *)
1225 av_realloc(track, sizeof(MatroskaSubtitleTrack));
1226 break;
1227 case MATROSKA_TRACK_TYPE_COMPLEX:
1228 case MATROSKA_TRACK_TYPE_LOGO:
1229 case MATROSKA_TRACK_TYPE_CONTROL:
1230 default:
1231 av_log(matroska->ctx, AV_LOG_INFO,
1232 "Unknown or unsupported track type 0x%x\n",
1233 track->type);
1234 track->type = 0;
1235 break;
1236 }
1237 matroska->tracks[matroska->num_tracks - 1] = track;
1238 break;
1239 }
1240
1241 /* tracktype specific stuff for video */
1242 case MATROSKA_ID_TRACKVIDEO: {
1243 MatroskaVideoTrack *videotrack;
1244 if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1245 av_log(matroska->ctx, AV_LOG_INFO,
1246 "video data in non-video track - ignoring\n");
1247 res = AVERROR_INVALIDDATA;
1248 break;
1249 } else if ((res = ebml_read_master(matroska, &id)) < 0)
1250 break;
1251 videotrack = (MatroskaVideoTrack *)track;
1252
1253 while (res == 0) {
1254 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1255 res = AVERROR_IO;
1256 break;
1257 } else if (matroska->level_up > 0) {
1258 matroska->level_up--;
1259 break;
1260 }
1261
1262 switch (id) {
1263 /* fixme, this should be one-up, but I get it here */
1264 case MATROSKA_ID_TRACKDEFAULTDURATION: {
1265 uint64_t num;
1266 if ((res = ebml_read_uint (matroska, &id,
1267 &num)) < 0)
1268 break;
1269 track->default_duration = num;
1270 break;
1271 }
1272
1273 /* video framerate */
1274 case MATROSKA_ID_VIDEOFRAMERATE: {
1275 double num;
1276 if ((res = ebml_read_float(matroska, &id,
1277 &num)) < 0)
1278 break;
1279 track->default_duration = 1000000000 * (1. / num);
1280 break;
1281 }
1282
1283 /* width of the size to display the video at */
1284 case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1285 uint64_t num;
1286 if ((res = ebml_read_uint(matroska, &id,
1287 &num)) < 0)
1288 break;
1289 videotrack->display_width = num;
1290 break;
1291 }
1292
1293 /* height of the size to display the video at */
1294 case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1295 uint64_t num;
1296 if ((res = ebml_read_uint(matroska, &id,
1297 &num)) < 0)
1298 break;
1299 videotrack->display_height = num;
1300 break;
1301 }
1302
1303 /* width of the video in the file */
1304 case MATROSKA_ID_VIDEOPIXELWIDTH: {
1305 uint64_t num;
1306 if ((res = ebml_read_uint(matroska, &id,
1307 &num)) < 0)
1308 break;
1309 videotrack->pixel_width = num;
1310 break;
1311 }
1312
1313 /* height of the video in the file */
1314 case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1315 uint64_t num;
1316 if ((res = ebml_read_uint(matroska, &id,
1317 &num)) < 0)
1318 break;
1319 videotrack->pixel_height = num;
1320 break;
1321 }
1322
1323 /* whether the video is interlaced */
1324 case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1325 uint64_t num;
1326 if ((res = ebml_read_uint(matroska, &id,
1327 &num)) < 0)
1328 break;
1329 if (num)
1330 track->flags |=
1331 MATROSKA_VIDEOTRACK_INTERLACED;
1332 else
1333 track->flags &=
1334 ~MATROSKA_VIDEOTRACK_INTERLACED;
1335 break;
1336 }
1337
1338 /* stereo mode (whether the video has two streams,
1339 * where one is for the left eye and the other for
1340 * the right eye, which creates a 3D-like
1341 * effect) */
1342 case MATROSKA_ID_VIDEOSTEREOMODE: {
1343 uint64_t num;
1344 if ((res = ebml_read_uint(matroska, &id,
1345 &num)) < 0)
1346 break;
1347 if (num != MATROSKA_EYE_MODE_MONO &&
1348 num != MATROSKA_EYE_MODE_LEFT &&
1349 num != MATROSKA_EYE_MODE_RIGHT &&
1350 num != MATROSKA_EYE_MODE_BOTH) {
1351 av_log(matroska->ctx, AV_LOG_INFO,
1352 "Ignoring unknown eye mode 0x%x\n",
1353 (uint32_t) num);
1354 break;
1355 }
1356 videotrack->eye_mode = num;
1357 break;
1358 }
1359
1360 /* aspect ratio behaviour */
1361 case MATROSKA_ID_VIDEOASPECTRATIO: {
1362 uint64_t num;
1363 if ((res = ebml_read_uint(matroska, &id,
1364 &num)) < 0)
1365 break;
1366 if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1367 num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1368 num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1369 av_log(matroska->ctx, AV_LOG_INFO,
1370 "Ignoring unknown aspect ratio 0x%x\n",
1371 (uint32_t) num);
1372 break;
1373 }
1374 videotrack->ar_mode = num;
1375 break;
1376 }
1377
1378 /* colourspace (only matters for raw video)
1379 * fourcc */
1380 case MATROSKA_ID_VIDEOCOLOURSPACE: {
1381 uint64_t num;
1382 if ((res = ebml_read_uint(matroska, &id,
1383 &num)) < 0)
1384 break;
1385 videotrack->fourcc = num;
1386 break;
1387 }
1388
1389 default:
1390 av_log(matroska->ctx, AV_LOG_INFO,
1391 "Unknown video track header entry "
1392 "0x%x - ignoring\n", id);
1393 /* pass-through */
1394
1395 case EBML_ID_VOID:
1396 res = ebml_read_skip(matroska);
1397 break;
1398 }
1399
1400 if (matroska->level_up) {
1401 matroska->level_up--;
1402 break;
1403 }
1404 }
1405 break;
1406 }
1407
1408 /* tracktype specific stuff for audio */
1409 case MATROSKA_ID_TRACKAUDIO: {
1410 MatroskaAudioTrack *audiotrack;
1411 if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1412 av_log(matroska->ctx, AV_LOG_INFO,
1413 "audio data in non-audio track - ignoring\n");
1414 res = AVERROR_INVALIDDATA;
1415 break;
1416 } else if ((res = ebml_read_master(matroska, &id)) < 0)
1417 break;
1418 audiotrack = (MatroskaAudioTrack *)track;
1419
1420 while (res == 0) {
1421 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1422 res = AVERROR_IO;
1423 break;
1424 } else if (matroska->level_up > 0) {
1425 matroska->level_up--;
1426 break;
1427 }
1428
1429 switch (id) {
1430 /* samplerate */
1431 case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1432 double num;
1433 if ((res = ebml_read_float(matroska, &id,
1434 &num)) < 0)
1435 break;
1436 audiotrack->samplerate = num;
1437 break;
1438 }
1439
1440 /* bitdepth */
1441 case MATROSKA_ID_AUDIOBITDEPTH: {
1442 uint64_t num;
1443 if ((res = ebml_read_uint(matroska, &id,
1444 &num)) < 0)
1445 break;
1446 audiotrack->bitdepth = num;
1447 break;
1448 }
1449
1450 /* channels */
1451 case MATROSKA_ID_AUDIOCHANNELS: {
1452 uint64_t num;
1453 if ((res = ebml_read_uint(matroska, &id,
1454 &num)) < 0)
1455 break;
1456 audiotrack->channels = num;
1457 break;
1458 }
1459
1460 default:
1461 av_log(matroska->ctx, AV_LOG_INFO,
1462 "Unknown audio track header entry "
1463 "0x%x - ignoring\n", id);
1464 /* pass-through */
1465
1466 case EBML_ID_VOID:
1467 res = ebml_read_skip(matroska);
1468 break;
1469 }
1470
1471 if (matroska->level_up) {
1472 matroska->level_up--;
1473 break;
1474 }
1475 }
1476 break;
1477 }
1478
1479 /* codec identifier */
1480 case MATROSKA_ID_CODECID: {
1481 char *text;
1482 if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1483 break;
1484 track->codec_id = text;
1485 break;
1486 }
1487
1488 /* codec private data */
1489 case MATROSKA_ID_CODECPRIVATE: {
1490 uint8_t *data;
1491 int size;
1492 if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1493 break;
1494 track->codec_priv = data;
1495 track->codec_priv_size = size;
1496 break;
1497 }
1498
1499 /* name of the codec */
1500 case MATROSKA_ID_CODECNAME: {
1501 char *text;
1502 if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1503 break;
1504 track->codec_name = text;
1505 break;
1506 }
1507
1508 /* name of this track */
1509 case MATROSKA_ID_TRACKNAME: {
1510 char *text;
1511 if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1512 break;
1513 track->name = text;
1514 break;
1515 }
1516
1517 /* language (matters for audio/subtitles, mostly) */
1518 case MATROSKA_ID_TRACKLANGUAGE: {
1519 char *text;
1520 if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1521 break;
1522 track->language = text;
1523 break;
1524 }
1525
1526 /* whether this is actually used */
1527 case MATROSKA_ID_TRACKFLAGENABLED: {
1528 uint64_t num;
1529 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1530 break;
1531 if (num)
1532 track->flags |= MATROSKA_TRACK_ENABLED;
1533 else
1534 track->flags &= ~MATROSKA_TRACK_ENABLED;
1535 break;
1536 }
1537
1538 /* whether it's the default for this track type */
1539 case MATROSKA_ID_TRACKFLAGDEFAULT: {
1540 uint64_t num;
1541 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1542 break;
1543 if (num)
1544 track->flags |= MATROSKA_TRACK_DEFAULT;
1545 else
1546 track->flags &= ~MATROSKA_TRACK_DEFAULT;
1547 break;
1548 }
1549
1550 /* lacing (like MPEG, where blocks don't end/start on frame
1551 * boundaries) */
1552 case MATROSKA_ID_TRACKFLAGLACING: {
1553 uint64_t num;
1554 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1555 break;
1556 if (num)
1557 track->flags |= MATROSKA_TRACK_LACING;
1558 else
1559 track->flags &= ~MATROSKA_TRACK_LACING;
1560 break;
1561 }
1562
1563 /* default length (in time) of one data block in this track */
1564 case MATROSKA_ID_TRACKDEFAULTDURATION: {
1565 uint64_t num;
1566 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1567 break;
1568 track->default_duration = num;
1569 break;
1570 }
1571
1572 default:
1573 av_log(matroska->ctx, AV_LOG_INFO,
1574 "Unknown track header entry 0x%x - ignoring\n", id);
1575 /* pass-through */
1576
1577 case EBML_ID_VOID:
1578 /* we ignore these because they're nothing useful. */
1579 case MATROSKA_ID_CODECINFOURL:
1580 case MATROSKA_ID_CODECDOWNLOADURL:
1581 case MATROSKA_ID_TRACKMINCACHE:
1582 case MATROSKA_ID_TRACKMAXCACHE:
1583 res = ebml_read_skip(matroska);
1584 break;
1585 }
1586
1587 if (matroska->level_up) {
1588 matroska->level_up--;
1589 break;
1590 }
1591 }
1592
1593 return res;
1594 }
1595
1596 static int
1597 matroska_parse_tracks (MatroskaDemuxContext *matroska)
1598 {
1599 int res = 0;
1600 uint32_t id;
1601
1602 av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1603
1604 while (res == 0) {
1605 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1606 res = AVERROR_IO;
1607 break;
1608 } else if (matroska->level_up) {
1609 matroska->level_up--;
1610 break;
1611 }
1612
1613 switch (id) {
1614 /* one track within the "all-tracks" header */
1615 case MATROSKA_ID_TRACKENTRY:
1616 res = matroska_add_stream(matroska);
1617 break;
1618
1619 default:
1620 av_log(matroska->ctx, AV_LOG_INFO,
1621 "Unknown entry 0x%x in track header\n", id);
1622 /* fall-through */
1623
1624 case EBML_ID_VOID:
1625 res = ebml_read_skip(matroska);
1626 break;
1627 }
1628
1629 if (matroska->level_up) {
1630 matroska->level_up--;
1631 break;
1632 }
1633 }
1634
1635 return res;
1636 }
1637
1638 static int
1639 matroska_parse_index (MatroskaDemuxContext *matroska)
1640 {
1641 int res = 0;
1642 uint32_t id;
1643 MatroskaDemuxIndex idx;
1644
1645 av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1646
1647 while (res == 0) {
1648 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1649 res = AVERROR_IO;
1650 break;
1651 } else if (matroska->level_up) {
1652 matroska->level_up--;
1653 break;
1654 }
1655
1656 switch (id) {
1657 /* one single index entry ('point') */
1658 case MATROSKA_ID_POINTENTRY:
1659 if ((res = ebml_read_master(matroska, &id)) < 0)
1660 break;
1661
1662 /* in the end, we hope to fill one entry with a
1663 * timestamp, a file position and a tracknum */
1664 idx.pos = (uint64_t) -1;
1665 idx.time = (uint64_t) -1;
1666 idx.track = (uint16_t) -1;
1667
1668 while (res == 0) {
1669 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1670 res = AVERROR_IO;
1671 break;
1672 } else if (matroska->level_up) {
1673 matroska->level_up--;
1674 break;
1675 }
1676
1677 switch (id) {
1678 /* one single index entry ('point') */
1679 case MATROSKA_ID_CUETIME: {
1680 int64_t time;
1681 if ((res = ebml_read_uint(matroska, &id,
1682 &time)) < 0)
1683 break;
1684 idx.time = time * matroska->time_scale;
1685 break;
1686 }
1687
1688 /* position in the file + track to which it
1689 * belongs */
1690 case MATROSKA_ID_CUETRACKPOSITION:
1691 if ((res = ebml_read_master(matroska, &id)) < 0)
1692 break;
1693
1694 while (res == 0) {
1695 if (!(id = ebml_peek_id (matroska,
1696 &matroska->level_up))) {
1697 res = AVERROR_IO;
1698 break;
1699 } else if (matroska->level_up) {
1700 matroska->level_up--;
1701 break;
1702 }
1703
1704 switch (id) {
1705 /* track number */
1706 case MATROSKA_ID_CUETRACK: {
1707 uint64_t num;
1708 if ((res = ebml_read_uint(matroska,
1709 &id, &num)) < 0)
1710 break;
1711 idx.track = num;
1712 break;
1713 }
1714
1715 /* position in file */
1716 case MATROSKA_ID_CUECLUSTERPOSITION: {
1717 uint64_t num;
1718 if ((res = ebml_read_uint(matroska,
1719 &id, &num)) < 0)
1720 break;
1721 idx.pos = num;
1722 break;
1723 }
1724
1725 default:
1726 av_log(matroska->ctx, AV_LOG_INFO,
1727 "Unknown entry 0x%x in "
1728 "CuesTrackPositions\n", id);
1729 /* fall-through */
1730
1731 case EBML_ID_VOID:
1732 res = ebml_read_skip(matroska);
1733 break;
1734 }
1735
1736 if (matroska->level_up) {
1737 matroska->level_up--;
1738 break;
1739 }
1740 }
1741
1742 break;
1743
1744 default:
1745 av_log(matroska->ctx, AV_LOG_INFO,
1746 "Unknown entry 0x%x in cuespoint "
1747 "index\n", id);
1748 /* fall-through */
1749
1750 case EBML_ID_VOID:
1751 res = ebml_read_skip(matroska);
1752 break;
1753 }
1754
1755 if (matroska->level_up) {
1756 matroska->level_up--;
1757 break;
1758 }
1759 }
1760
1761 /* so let's see if we got what we wanted */
1762 if (idx.pos != (uint64_t) -1 &&
1763 idx.time != (uint64_t) -1 &&
1764 idx.track != (uint16_t) -1) {
1765 if (matroska->num_indexes % 32 == 0) {
1766 /* re-allocate bigger index */
1767 matroska->index =
1768 av_realloc(matroska->index,
1769 (matroska->num_indexes + 32) *
1770 sizeof(MatroskaDemuxIndex));
1771 }
1772 matroska->index[matroska->num_indexes] = idx;
1773 matroska->num_indexes++;
1774 }
1775 break;
1776
1777 default:
1778 av_log(matroska->ctx, AV_LOG_INFO,
1779 "Unknown entry 0x%x in cues header\n", id);
1780 /* fall-through */
1781
1782 case EBML_ID_VOID:
1783 res = ebml_read_skip(matroska);
1784 break;
1785 }
1786
1787 if (matroska->level_up) {
1788 matroska->level_up--;
1789 break;
1790 }
1791 }
1792
1793 return res;
1794 }
1795
1796 static int
1797 matroska_parse_metadata (MatroskaDemuxContext *matroska)
1798 {
1799 int res = 0;
1800 uint32_t id;
1801
1802 while (res == 0) {
1803 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1804 res = AVERROR_IO;
1805 break;
1806 } else if (matroska->level_up) {
1807 matroska->level_up--;
1808 break;
1809 }
1810
1811 switch (id) {
1812 /* Hm, this is unsupported... */
1813 default:
1814 av_log(matroska->ctx, AV_LOG_INFO,
1815 "Unknown entry 0x%x in metadata header\n", id);
1816 /* fall-through */
1817
1818 case EBML_ID_VOID:
1819 res = ebml_read_skip(matroska);
1820 break;
1821 }
1822
1823 if (matroska->level_up) {
1824 matroska->level_up--;
1825 break;
1826 }
1827 }
1828
1829 return res;
1830 }
1831
1832 static int
1833 matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1834 {
1835 int res = 0;
1836 uint32_t id;
1837
1838 av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1839
1840 while (res == 0) {
1841 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1842 res = AVERROR_IO;
1843 break;
1844 } else if (matroska->level_up) {
1845 matroska->level_up--;
1846 break;
1847 }
1848
1849 switch (id) {
1850 case MATROSKA_ID_SEEKENTRY: {
1851 uint32_t seek_id = 0, peek_id_cache = 0;
1852 uint64_t seek_pos = (uint64_t) -1, t;
1853
1854 if ((res = ebml_read_master(matroska, &id)) < 0)
1855 break;
1856
1857 while (res == 0) {
1858 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1859 res = AVERROR_IO;
1860 break;
1861 } else if (matroska->level_up) {
1862 matroska->level_up--;
1863 break;
1864 }
1865
1866 switch (id) {
1867 case MATROSKA_ID_SEEKID:
1868 res = ebml_read_uint(matroska, &id, &t);
1869 seek_id = t;
1870 break;
1871
1872 case MATROSKA_ID_SEEKPOSITION:
1873 res = ebml_read_uint(matroska, &id, &seek_pos);
1874 break;
1875
1876 default:
1877 av_log(matroska->ctx, AV_LOG_INFO,
1878 "Unknown seekhead ID 0x%x\n", id);
1879 /* fall-through */
1880
1881 case EBML_ID_VOID:
1882 res = ebml_read_skip(matroska);
1883 break;
1884 }
1885
1886 if (matroska->level_up) {
1887 matroska->level_up--;
1888 break;
1889 }
1890 }
1891
1892 if (!seek_id || seek_pos == (uint64_t) -1) {
1893 av_log(matroska->ctx, AV_LOG_INFO,
1894 "Incomplete seekhead entry (0x%x/%llu)\n",
1895 seek_id, seek_pos);
1896 break;
1897 }
1898
1899 switch (seek_id) {
1900 case MATROSKA_ID_CUES:
1901 case MATROSKA_ID_TAGS: {
1902 uint32_t level_up = matroska->level_up;
1903 offset_t before_pos;
1904 uint64_t length;
1905 MatroskaLevel level;
1906
1907 /* remember the peeked ID and the current position */
1908 peek_id_cache = matroska->peek_id;
1909 before_pos = url_ftell(&matroska->ctx->pb);
1910
1911 /* seek */
1912 if ((res = ebml_read_seek(matroska, seek_pos +
1913 matroska->segment_start)) < 0)
1914 return res;
1915
1916 /* we don't want to lose our seekhead level, so we add
1917 * a dummy. This is a crude hack. */
1918 if (matroska->num_levels == EBML_MAX_DEPTH) {
1919 av_log(matroska->ctx, AV_LOG_INFO,
1920 "Max EBML element depth (%d) reached, "
1921 "cannot parse further.\n", EBML_MAX_DEPTH);
1922 return AVERROR_UNKNOWN;
1923 }
1924
1925 level.start = 0;
1926 level.length = (uint64_t)-1;
1927 matroska->levels[matroska->num_levels] = level;
1928 matroska->num_levels++;
1929
1930 /* check ID */
1931 if (!(id = ebml_peek_id (matroska,
1932 &matroska->level_up)))
1933 break;
1934 if (id != seek_id) {
1935 av_log(matroska->ctx, AV_LOG_INFO,
1936 "We looked for ID=0x%x but got "
1937 "ID=0x%x (pos=%llu)",
1938 seek_id, id, seek_pos +
1939 matroska->segment_start);
1940 goto finish;
1941 }
1942
1943 /* read master + parse */
1944 if ((res = ebml_read_master(matroska, &id)) < 0)
1945 break;
1946 switch (id) {
1947 case MATROSKA_ID_CUES:
1948 if (!(res = matroska_parse_index(matroska)) ||
1949 url_feof(&matroska->ctx->pb)) {
1950 matroska->index_parsed = 1;
1951 res = 0;
1952 }
1953 break;
1954 case MATROSKA_ID_TAGS:
1955 if (!(res = matroska_parse_metadata(matroska)) ||
1956 url_feof(&matroska->ctx->pb)) {
1957 matroska->metadata_parsed = 1;
1958 res = 0;
1959 }
1960 break;
1961 }
1962 if (res < 0)
1963 break;
1964
1965 finish:
1966 /* remove dummy level */
1967 while (matroska->num_levels) {
1968 matroska->num_levels--;
1969 length =
1970 matroska->levels[matroska->num_levels].length;
1971 if (length == (uint64_t)-1)
1972 break;
1973 }
1974
1975 /* seek back */
1976 if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1977 return res;
1978 matroska->peek_id = peek_id_cache;
1979 matroska->level_up = level_up;
1980 break;
1981 }
1982
1983 default:
1984 av_log(matroska->ctx, AV_LOG_INFO,
1985 "Ignoring seekhead entry for ID=0x%x\n",
1986 seek_id);
1987 break;
1988 }
1989
1990 break;
1991 }
1992
1993 default:
1994 av_log(matroska->ctx, AV_LOG_INFO,
1995 "Unknown seekhead ID 0x%x\n", id);
1996 /* fall-through */
1997
1998 case EBML_ID_VOID:
1999 res = ebml_read_skip(matroska);
2000 break;
2001 }
2002
2003 if (matroska->level_up) {
2004 matroska->level_up--;
2005 break;
2006 }
2007 }
2008
2009 return res;
2010 }
2011
2012 static int
2013 matroska_read_header (AVFormatContext *s,
2014 AVFormatParameters *ap)
2015 {
2016 MatroskaDemuxContext *matroska = s->priv_data;
2017 char *doctype;
2018 int version, last_level, res = 0;
2019 uint32_t id;
2020
2021 matroska->ctx = s;
2022
2023 /* First read the EBML header. */
2024 doctype = NULL;
2025 if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2026 return res;
2027 if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2028 av_log(matroska->ctx, AV_LOG_ERROR,
2029 "Wrong EBML doctype ('%s' != 'matroska').\n",
2030 doctype ? doctype : "(none)");
2031 if (doctype)
2032 av_free(doctype);
2033 return AVERROR_NOFMT;
2034 }
2035 av_free(doctype);
2036 if (version != 1) {
2037 av_log(matroska->ctx, AV_LOG_ERROR,
2038 "Matroska demuxer version 1 too old for file version %d\n",
2039 version);
2040 return AVERROR_NOFMT;
2041 }
2042
2043 /* The next thing is a segment. */
2044 while (1) {
2045 if (!(id = ebml_peek_id(matroska, &last_level)))
2046 return AVERROR_IO;
2047 if (id == MATROSKA_ID_SEGMENT)
2048 break;
2049
2050 /* oi! */
2051 av_log(matroska->ctx, AV_LOG_INFO,
2052 "Expected a Segment ID (0x%x), but received 0x%x!\n",
2053 MATROSKA_ID_SEGMENT, id);
2054 if ((res = ebml_read_skip(matroska)) < 0)
2055 return res;
2056 }
2057
2058 /* We now have a Matroska segment.
2059 * Seeks are from the beginning of the segment,
2060 * after the segment ID/length. */
2061 if ((res = ebml_read_master(matroska, &id)) < 0)
2062 return res;
2063 matroska->segment_start = url_ftell(&s->pb);
2064
2065 matroska->time_scale = 1000000;
2066 /* we've found our segment, start reading the different contents in here */
2067 while (res == 0) {
2068 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2069 res = AVERROR_IO;
2070 break;
2071 } else if (matroska->level_up) {
2072 matroska->level_up--;
2073 break;
2074 }
2075
2076 switch (id) {
2077 /* stream info */
2078 case MATROSKA_ID_INFO: {
2079 if ((res = ebml_read_master(matroska, &id)) < 0)
2080 break;
2081 res = matroska_parse_info(matroska);
2082 break;
2083 }
2084
2085 /* track info headers */
2086 case MATROSKA_ID_TRACKS: {
2087 if ((res = ebml_read_master(matroska, &id)) < 0)
2088 break;
2089 res = matroska_parse_tracks(matroska);
2090 break;
2091 }
2092
2093 /* stream index */
2094 case MATROSKA_ID_CUES: {
2095 if (!matroska->index_parsed) {
2096 if ((res = ebml_read_master(matroska, &id)) < 0)
2097 break;
2098 res = matroska_parse_index(matroska);
2099 } else
2100 res = ebml_read_skip(matroska);
2101 break;
2102 }
2103
2104 /* metadata */
2105 case MATROSKA_ID_TAGS: {
2106 if (!matroska->metadata_parsed) {
2107 if ((res = ebml_read_master(matroska, &id)) < 0)
2108 break;
2109 res = matroska_parse_metadata(matroska);
2110 } else
2111 res = ebml_read_skip(matroska);
2112 break;
2113 }
2114
2115 /* file index (if seekable, seek to Cues/Tags to parse it) */
2116 case MATROSKA_ID_SEEKHEAD: {
2117 if ((res = ebml_read_master(matroska, &id)) < 0)
2118 break;
2119 res = matroska_parse_seekhead(matroska);
2120 break;
2121 }
2122
2123 case MATROSKA_ID_CLUSTER: {
2124 /* Do not read the master - this will be done in the next
2125 * call to matroska_read_packet. */
2126 res = 1;
2127 break;
2128 }
2129
2130 default:
2131 av_log(matroska->ctx, AV_LOG_INFO,
2132 "Unknown matroska file header ID 0x%x\n", id);
2133 /* fall-through */
2134
2135 case EBML_ID_VOID:
2136 res = ebml_read_skip(matroska);
2137 break;
2138 }
2139
2140 if (matroska->level_up) {
2141 matroska->level_up--;
2142 break;
2143 }
2144 }
2145
2146 if (res < 0)
2147 return res;
2148
2149 /* Have we found a cluster? */
2150 if (res == 1) {
2151 int i;
2152 enum CodecID codec_id;
2153 MatroskaTrack *track;
2154 AVStream *st;
2155 void *extradata = NULL;
2156 int extradata_size = 0;
2157
2158 for (i = 0; i < matroska->num_tracks; i++) {
2159 track = matroska->tracks[i];
2160
2161 /* libavformat does not really support subtitles.
2162 * Also apply some sanity checks. */
2163 if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2164 (track->codec_id == NULL))
2165 continue;
2166
2167 /* Set the FourCC from the CodecID. */
2168 /* This is the MS compatibility mode which stores a
2169 * BITMAPINFOHEADER in the CodecPrivate. */
2170 if (!strcmp(track->codec_id,
2171 MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2172 (track->codec_priv_size >= 40) &&
2173 (track->codec_priv != NULL)) {
2174 unsigned char *p;
2175
2176 /* Offset of biCompression. Stored in LE. */
2177 p = (unsigned char *)track->codec_priv + 16;
2178 ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2179 (p[2] << 16) | (p[1] << 8) | p[0];
2180 codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
2181
2182 } else if (!strcmp(track->codec_id,
2183 MATROSKA_CODEC_ID_VIDEO_MPEG4_SP) ||
2184 !strcmp(track->codec_id,
2185 MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP) ||
2186 !strcmp(track->codec_id,
2187 MATROSKA_CODEC_ID_VIDEO_MPEG4_AP))
2188 codec_id = CODEC_ID_MPEG4;
2189 else if (!strcmp(track->codec_id,
2190 MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC))
2191 codec_id = CODEC_ID_H264;
2192 /* else if (!strcmp(track->codec_id, */
2193 /* MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED)) */
2194 /* codec_id = CODEC_ID_???; */
2195 else if (!strcmp(track->codec_id,
2196 MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3))
2197 codec_id = CODEC_ID_MSMPEG4V3;
2198 else if (!strcmp(track->codec_id,
2199 MATROSKA_CODEC_ID_VIDEO_MPEG1) ||
2200 !strcmp(track->codec_id,
2201 MATROSKA_CODEC_ID_VIDEO_MPEG2))
2202 codec_id = CODEC_ID_MPEG2VIDEO;
2203
2204 /* This is the MS compatibility mode which stores a
2205 * WAVEFORMATEX in the CodecPrivate. */
2206 else if (!strcmp(track->codec_id,
2207 MATROSKA_CODEC_ID_AUDIO_ACM) &&
2208 (track->codec_priv_size >= 18) &&
2209 (track->codec_priv != NULL)) {
2210 unsigned char *p;
2211 uint16_t tag;
2212
2213 /* Offset of wFormatTag. Stored in LE. */
2214 p = (unsigned char *)track->codec_priv;
2215 tag = (p[1] << 8) | p[0];
2216 codec_id = codec_get_wav_id(tag);
2217
2218 } else if (!strcmp(track->codec_id,
2219 MATROSKA_CODEC_ID_AUDIO_MPEG1_L1) ||
2220 !strcmp(track->codec_id,
2221 MATROSKA_CODEC_ID_AUDIO_MPEG1_L2) ||
2222 !strcmp(track->codec_id,
2223 MATROSKA_CODEC_ID_AUDIO_MPEG1_L3))
2224 codec_id = CODEC_ID_MP3;
2225 else if (!strcmp(track->codec_id,
2226 MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE))
2227 codec_id = CODEC_ID_PCM_U16BE;
2228 else if (!strcmp(track->codec_id,
2229 MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE))
2230 codec_id = CODEC_ID_PCM_U16LE;
2231 /* else if (!strcmp(track->codec_id, */
2232 /* MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT)) */
2233 /* codec_id = CODEC_ID_PCM_???; */
2234 else if (!strcmp(track->codec_id,
2235 MATROSKA_CODEC_ID_AUDIO_AC3))
2236 codec_id = CODEC_ID_AC3;
2237 else if (!strcmp(track->codec_id,
2238 MATROSKA_CODEC_ID_AUDIO_DTS))
2239 codec_id = CODEC_ID_DTS;
2240 /* No such codec id so far. */
2241 /* else if (!strcmp(track->codec_id, */
2242 /* MATROSKA_CODEC_ID_AUDIO_DTS)) */
2243 /* codec_id = CODEC_ID_DTS; */
2244 else if (!strcmp(track->codec_id,
2245 MATROSKA_CODEC_ID_AUDIO_VORBIS)) {
2246 extradata_size = track->codec_priv_size;
2247 if(extradata_size) {
2248 extradata = av_malloc(extradata_size);
2249 if(extradata == NULL)
2250 return AVERROR_NOMEM;
2251 memcpy(extradata, track->codec_priv, extradata_size);
2252 }
2253 codec_id = CODEC_ID_VORBIS;
2254 } else if (!strcmp(track->codec_id,
2255 MATROSKA_CODEC_ID_AUDIO_MPEG2) ||
2256 !strcmp(track->codec_id,
2257 MATROSKA_CODEC_ID_AUDIO_MPEG4))
2258 codec_id = CODEC_ID_AAC;
2259 else
2260 codec_id = CODEC_ID_NONE;
2261
2262 if (codec_id == CODEC_ID_NONE) {
2263 av_log(matroska->ctx, AV_LOG_INFO,
2264 "Unknown/unsupported CodecID %s.\n",
2265 track->codec_id);
2266 }
2267
2268 track->stream_index = matroska->num_streams;
2269
2270 matroska->num_streams++;
2271 st = av_new_stream(s, track->stream_index);
2272 if (st == NULL)
2273 return AVERROR_NOMEM;
2274 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
2275
2276 st->codec->codec_id = codec_id;
2277
2278 if(extradata){
2279 st->codec->extradata = extradata;
2280 st->codec->extradata_size = extradata_size;
2281 } else if(track->codec_priv && track->codec_priv_size > 0){
2282 st->codec->extradata = av_malloc(track->codec_priv_size);
2283 if(st->codec->extradata == NULL)
2284 return AVERROR_NOMEM;
2285 st->codec->extradata_size = track->codec_priv_size;
2286 memcpy(st->codec->extradata, track->codec_priv,
2287 track->codec_priv_size);
2288 }
2289
2290 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2291 MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2292
2293 st->codec->codec_type = CODEC_TYPE_VIDEO;
2294 st->codec->codec_tag = videotrack->fourcc;
2295 st->codec->width = videotrack->pixel_width;
2296 st->codec->height = videotrack->pixel_height;
2297 if (videotrack->display_width == 0)
2298 st->codec->sample_aspect_ratio.num =
2299 videotrack->pixel_width;
2300 else
2301 st->codec->sample_aspect_ratio.num =
2302 videotrack->display_width;
2303 if (videotrack->display_height == 0)
2304 st->codec->sample_aspect_ratio.num =
2305 videotrack->pixel_height;
2306 else
2307 st->codec->sample_aspect_ratio.num =
2308 videotrack->display_height;
2309
2310 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2311 MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2312
2313 st->codec->codec_type = CODEC_TYPE_AUDIO;
2314 st->codec->sample_rate = audiotrack->samplerate;
2315 st->codec->channels = audiotrack->channels;
2316 }
2317
2318 /* What do we do with private data? E.g. for Vorbis. */
2319 }
2320 }
2321
2322 return 0;
2323 }
2324
2325 static int
2326 matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2327 int num)
2328 {
2329 int i;
2330
2331 for (i = 0; i < matroska->num_tracks; i++)
2332 if (matroska->tracks[i]->num == num)
2333 return i;
2334
2335 return -1;
2336 }
2337
2338 static int
2339 matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2340 uint64_t cluster_time)
2341 {
2342 int res = 0;
2343 uint32_t id;
2344 AVPacket *pkt;
2345 int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2346
2347 av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2348
2349 while (res == 0) {
2350 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2351 res = AVERROR_IO;
2352 break;
2353 } else if (matroska->level_up) {
2354 matroska->level_up--;
2355 break;
2356 }
2357
2358 switch (id) {
2359 /* one block inside the group. Note, block parsing is one
2360 * of the harder things, so this code is a bit complicated.
2361 * See http://www.matroska.org/ for documentation. */
2362 case MATROSKA_ID_BLOCK: {
2363 uint8_t *data, *origdata;
2364 int size;
2365 uint64_t time;
2366 uint32_t *lace_size = NULL;
2367 int n, track, flags, laces = 0;
2368 uint64_t num;
2369 int64_t pos= url_ftell(&matroska->ctx->pb);
2370
2371 if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2372 break;
2373 origdata = data;
2374
2375 /* first byte(s): blocknum */
2376 if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2377 av_log(matroska->ctx, AV_LOG_ERROR,
2378 "EBML block data error\n");
2379 av_free(origdata);
2380 break;
2381 }
2382 data += n;
2383 size -= n;
2384
2385 /* fetch track from num */
2386 track = matroska_find_track_by_num(matroska, num);
2387 if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2388 av_log(matroska->ctx, AV_LOG_INFO,
2389 "Invalid stream %d or size %u\n", track, size);
2390 av_free(origdata);
2391 break;
2392 }
2393 if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2394 av_free(origdata);
2395 break;
2396 }
2397
2398 /* time (relative to cluster time) */
2399 time = ((data[0] << 8) | data[1]) * matroska->time_scale;
2400 data += 2;
2401 size -= 2;
2402 flags = *data;
2403 data += 1;
2404 size -= 1;
2405 switch ((flags & 0x06) >> 1) {
2406 case 0x0: /* no lacing */
2407 laces = 1;
2408 lace_size = av_mallocz(sizeof(int));
2409 lace_size[0] = size;
2410 break;
2411
2412 case 0x1: /* xiph lacing */
2413 case 0x2: /* fixed-size lacing */
2414 case 0x3: /* EBML lacing */
2415 if (size == 0) {
2416 res = -1;
2417 break;
2418 }
2419 laces = (*data) + 1;
2420 data += 1;
2421 size -= 1;
2422 lace_size = av_mallocz(laces * sizeof(int));
2423
2424 switch ((flags & 0x06) >> 1) {
2425 case 0x1: /* xiph lacing */ {
2426 uint8_t temp;
2427 uint32_t total = 0;
2428 for (n = 0; res == 0 && n < laces - 1; n++) {
2429 while (1) {
2430 if (size == 0) {
2431 res = -1;
2432 break;
2433 }
2434 temp = *data;
2435 lace_size[n] += temp;
2436 data += 1;
2437 size -= 1;
2438 if (temp != 0xff)
2439 break;
2440 }
2441 total += lace_size[n];
2442 }
2443 lace_size[n] = size - total;
2444 break;
2445 }
2446
2447 case 0x2: /* fixed-size lacing */
2448 for (n = 0; n < laces; n++)
2449 lace_size[n] = size / laces;
2450 break;
2451
2452 case 0x3: /* EBML lacing */ {
2453 uint32_t total;
2454 n = matroska_ebmlnum_uint(data, size, &num);
2455 if (n < 0) {
2456 av_log(matroska->ctx, AV_LOG_INFO,
2457 "EBML block data error\n");
2458 break;
2459 }
2460 data += n;
2461 size -= n;
2462 total = lace_size[0] = num;
2463 for (n = 1; res == 0 && n < laces - 1; n++) {
2464 int64_t snum;
2465 int r;
2466 r = matroska_ebmlnum_sint (data, size,
2467 &snum);
2468 if (r < 0) {
2469 av_log(matroska->ctx, AV_LOG_INFO,
2470 "EBML block data error\n");
2471 break;
2472 }
2473 data += r;
2474 size -= r;
2475 lace_size[n] = lace_size[n - 1] + snum;
2476 total += lace_size[n];
2477 }
2478 lace_size[n] = size - total;
2479 break;
2480 }
2481 }
2482 break;
2483 }
2484
2485 if (res == 0) {
2486 for (n = 0; n < laces; n++) {
2487 uint64_t timecode = 0;
2488
2489 pkt = av_mallocz(sizeof(AVPacket));
2490 /* XXX: prevent data copy... */
2491 if (av_new_packet(pkt,lace_size[n]) < 0) {
2492 res = AVERROR_NOMEM;
2493 break;
2494 }
2495 if (cluster_time != (uint64_t)-1) {
2496 if (time < 0 && (-time) > cluster_time)
2497 timecode = cluster_time;
2498 else
2499 timecode = cluster_time + time;
2500 }
2501 /* FIXME: duration */
2502
2503 memcpy(pkt->data, data, lace_size[n]);
2504 data += lace_size[n];
2505 if (n == 0)
2506 pkt->flags = is_keyframe;
2507 pkt->stream_index =
2508 matroska->tracks[track]->stream_index;
2509
2510 pkt->pts = timecode / 1000000; /* ns to ms */
2511 pkt->pos= pos;
2512
2513 matroska_queue_packet(matroska, pkt);
2514 }
2515 }
2516
2517 av_free(lace_size);
2518 av_free(origdata);
2519 break;
2520 }
2521
2522 case MATROSKA_ID_BLOCKDURATION: {
2523 uint64_t num;
2524 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2525 break;
2526 av_log(matroska->ctx, AV_LOG_INFO,
2527 "FIXME: implement support for BlockDuration\n");
2528 break;
2529 }
2530
2531 case MATROSKA_ID_BLOCKREFERENCE:
2532 /* We've found a reference, so not even the first frame in
2533 * the lace is a key frame. */
2534 is_keyframe = 0;
2535 if (last_num_packets != matroska->num_packets)
2536 matroska->packets[last_num_packets]->flags = 0;
2537 res = ebml_read_skip(matroska);
2538 break;
2539
2540 default:
2541 av_log(matroska->ctx, AV_LOG_INFO,
2542 "Unknown entry 0x%x in blockgroup data\n", id);
2543 /* fall-through */
2544
2545 case EBML_ID_VOID:
2546 res = ebml_read_skip(matroska);
2547 break;
2548 }
2549
2550 if (matroska->level_up) {
2551 matroska->level_up--;
2552 break;
2553 }
2554 }
2555
2556 return res;
2557 }
2558
2559 static int
2560 matroska_parse_cluster (MatroskaDemuxContext *matroska)
2561 {
2562 int res = 0;
2563 uint32_t id;
2564 uint64_t cluster_time = 0;
2565
2566 av_log(matroska->ctx, AV_LOG_DEBUG,
2567 "parsing cluster at %lld\n", url_ftell(&matroska->ctx->pb));
2568
2569 while (res == 0) {
2570 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2571 res = AVERROR_IO;
2572 break;
2573 } else if (matroska->level_up) {
2574 matroska->level_up--;
2575 break;
2576 }
2577
2578 switch (id) {
2579 /* cluster timecode */
2580 case MATROSKA_ID_CLUSTERTIMECODE: {
2581 uint64_t num;
2582 if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2583 break;
2584 cluster_time = num * matroska->time_scale;
2585 break;
2586 }
2587
2588 /* a group of blocks inside a cluster */
2589 case MATROSKA_ID_BLOCKGROUP:
2590 if ((res = ebml_read_master(matroska, &id)) < 0)
2591 break;
2592 res = matroska_parse_blockgroup(matroska, cluster_time);
2593 break;
2594
2595 default:
2596 av_log(matroska->ctx, AV_LOG_INFO,
2597 "Unknown entry 0x%x in cluster data\n", id);
2598 /* fall-through */
2599
2600 case EBML_ID_VOID:
2601 res = ebml_read_skip(matroska);
2602 break;
2603 }
2604
2605 if (matroska->level_up) {
2606 matroska->level_up--;
2607 break;
2608 }
2609 }
2610
2611 return res;
2612 }
2613
2614 static int
2615 matroska_read_packet (AVFormatContext *s,
2616 AVPacket *pkt)
2617 {
2618 MatroskaDemuxContext *matroska = s->priv_data;
2619 int res = 0;
2620 uint32_t id;
2621
2622 /* Do we still have a packet queued? */
2623 if (matroska_deliver_packet(matroska, pkt) == 0)
2624 return 0;
2625
2626 /* Have we already reached the end? */
2627 if (matroska->done)
2628 return AVERROR_IO;
2629
2630 while (res == 0) {
2631 if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2632 res = AVERROR_IO;
2633 break;
2634 } else if (matroska->level_up) {
2635 matroska->level_up--;
2636 break;
2637 }
2638
2639 switch (id) {
2640 case MATROSKA_ID_CLUSTER:
2641 if ((res = ebml_read_master(matroska, &id)) < 0)
2642 break;
2643 if ((res = matroska_parse_cluster(matroska)) == 0)
2644 res = 1; /* Parsed one cluster, let's get out. */
2645 break;
2646
2647 default:
2648 case EBML_ID_VOID:
2649 res = ebml_read_skip(matroska);
2650 break;
2651 }
2652
2653 if (matroska->level_up) {
2654 matroska->level_up--;
2655 break;
2656 }
2657 }
2658
2659 if (res == -1)
2660 matroska->done = 1;
2661
2662 return matroska_deliver_packet(matroska, pkt);
2663 }
2664
2665 static int
2666 matroska_read_close (AVFormatContext *s)
2667 {
2668 MatroskaDemuxContext *matroska = s->priv_data;
2669 int n = 0;
2670
2671 if (matroska->writing_app)
2672 av_free(matroska->writing_app);
2673 if (matroska->muxing_app)
2674 av_free(matroska->muxing_app);
2675 if (matroska->index)
2676 av_free(matroska->index);
2677
2678 if (matroska->packets != NULL) {
2679 for (n = 0; n < matroska->num_packets; n++) {
2680 av_free_packet(matroska->packets[n]);
2681 av_free(matroska->packets[n]);
2682 }
2683 av_free(matroska->packets);
2684 }
2685
2686 for (n = 0; n < matroska->num_tracks; n++) {
2687 MatroskaTrack *track = matroska->tracks[n];
2688 if (track->codec_id)
2689 av_free(track->codec_id);
2690 if (track->codec_name)
2691 av_free(track->codec_name);
2692 if (track->codec_priv)
2693 av_free(track->codec_priv);
2694 if (track->name)
2695 av_free(track->name);
2696 if (track->language)
2697 av_free(track->language);
2698
2699 av_free(track);
2700 }
2701
2702 for (n = 0; n < s->nb_streams; n++) {
2703 av_free(s->streams[n]->codec->extradata);
2704 }
2705
2706 memset(matroska, 0, sizeof(MatroskaDemuxContext));
2707
2708 return 0;
2709 }
2710
2711 static AVInputFormat matroska_iformat = {
2712 "matroska",
2713 "Matroska file format",
2714 sizeof(MatroskaDemuxContext),
2715 matroska_probe,
2716 matroska_read_header,
2717 matroska_read_packet,
2718 matroska_read_close,
2719 };
2720
2721 int
2722 matroska_init(void)
2723 {
2724 av_register_input_format(&matroska_iformat);
2725 return 0;
2726 }
Libav master