FFmpeg  1.2.12
matroskaenc.c
Go to the documentation of this file.
1 /*
2  * Matroska muxer
3  * Copyright (c) 2007 David Conrad
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "internal.h"
24 #include "riff.h"
25 #include "isom.h"
26 #include "matroska.h"
27 #include "avc.h"
28 #include "flacenc.h"
29 #include "avlanguage.h"
30 #include "subtitles.h"
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/sha.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/intfloat.h"
35 #include "libavutil/mathematics.h"
36 #include "libavutil/random_seed.h"
37 #include "libavutil/lfg.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/avstring.h"
40 #include "libavcodec/xiph.h"
41 #include "libavcodec/mpeg4audio.h"
42 
43 typedef struct ebml_master {
44  int64_t pos;
45  int sizebytes;
46 } ebml_master;
47 
48 typedef struct mkv_seekhead_entry {
49  unsigned int elementid;
50  uint64_t segmentpos;
52 
53 typedef struct mkv_seekhead {
54  int64_t filepos;
55  int64_t segment_offset;
60 } mkv_seekhead;
61 
62 typedef struct {
63  uint64_t pts;
64  int tracknum;
65  int64_t cluster_pos;
66 } mkv_cuepoint;
67 
68 typedef struct {
69  int64_t segment_offset;
72 } mkv_cues;
73 
74 typedef struct {
75  int write_dts;
76  int has_cue;
77 } mkv_track;
78 
79 #define MODE_MATROSKAv2 0x01
80 #define MODE_WEBM 0x02
81 
82 typedef struct MatroskaMuxContext {
83  int mode;
86  int64_t segment_offset;
88  int64_t cluster_pos;
89  int64_t cluster_pts;
90  int64_t duration_offset;
91  int64_t duration;
95 
96  unsigned int audio_buffer_size;
98 
101 
102 
105 #define MAX_SEEKENTRY_SIZE 21
106 
109 #define MAX_CUETRACKPOS_SIZE 22
110 
112 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
113 
114 
115 static int ebml_id_size(unsigned int id)
116 {
117  return (av_log2(id+1)-1)/7+1;
118 }
119 
120 static void put_ebml_id(AVIOContext *pb, unsigned int id)
121 {
122  int i = ebml_id_size(id);
123  while (i--)
124  avio_w8(pb, (uint8_t)(id >> (i*8)));
125 }
126 
132 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
133 {
134  av_assert0(bytes <= 8);
135  avio_w8(pb, 0x1ff >> bytes);
136  while (--bytes)
137  avio_w8(pb, 0xff);
138 }
139 
143 static int ebml_num_size(uint64_t num)
144 {
145  int bytes = 1;
146  while ((num+1) >> bytes*7) bytes++;
147  return bytes;
148 }
149 
156 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
157 {
158  int i, needed_bytes = ebml_num_size(num);
159 
160  // sizes larger than this are currently undefined in EBML
161  av_assert0(num < (1ULL<<56)-1);
162 
163  if (bytes == 0)
164  // don't care how many bytes are used, so use the min
165  bytes = needed_bytes;
166  // the bytes needed to write the given size would exceed the bytes
167  // that we need to use, so write unknown size. This shouldn't happen.
168  av_assert0(bytes >= needed_bytes);
169 
170  num |= 1ULL << bytes*7;
171  for (i = bytes - 1; i >= 0; i--)
172  avio_w8(pb, (uint8_t)(num >> i*8));
173 }
174 
175 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
176 {
177  int i, bytes = 1;
178  uint64_t tmp = val;
179  while (tmp>>=8) bytes++;
180 
181  put_ebml_id(pb, elementid);
182  put_ebml_num(pb, bytes, 0);
183  for (i = bytes - 1; i >= 0; i--)
184  avio_w8(pb, (uint8_t)(val >> i*8));
185 }
186 
187 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
188 {
189  put_ebml_id(pb, elementid);
190  put_ebml_num(pb, 8, 0);
191  avio_wb64(pb, av_double2int(val));
192 }
193 
194 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
195  const void *buf, int size)
196 {
197  put_ebml_id(pb, elementid);
198  put_ebml_num(pb, size, 0);
199  avio_write(pb, buf, size);
200 }
201 
202 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
203 {
204  put_ebml_binary(pb, elementid, str, strlen(str));
205 }
206 
213 static void put_ebml_void(AVIOContext *pb, uint64_t size)
214 {
215  int64_t currentpos = avio_tell(pb);
216 
217  av_assert0(size >= 2);
218 
220  // we need to subtract the length needed to store the size from the
221  // size we need to reserve so 2 cases, we use 8 bytes to store the
222  // size if possible, 1 byte otherwise
223  if (size < 10)
224  put_ebml_num(pb, size-1, 0);
225  else
226  put_ebml_num(pb, size-9, 8);
227  while(avio_tell(pb) < currentpos + size)
228  avio_w8(pb, 0);
229 }
230 
231 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
232 {
233  int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
234  put_ebml_id(pb, elementid);
235  put_ebml_size_unknown(pb, bytes);
236  return (ebml_master){ avio_tell(pb), bytes };
237 }
238 
239 static void end_ebml_master(AVIOContext *pb, ebml_master master)
240 {
241  int64_t pos = avio_tell(pb);
242 
243  if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
244  return;
245  put_ebml_num(pb, pos - master.pos, master.sizebytes);
246  avio_seek(pb, pos, SEEK_SET);
247 }
248 
249 static void put_xiph_size(AVIOContext *pb, int size)
250 {
251  int i;
252  for (i = 0; i < size / 255; i++)
253  avio_w8(pb, 255);
254  avio_w8(pb, size % 255);
255 }
256 
268 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
269 {
270  mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
271  if (new_seekhead == NULL)
272  return NULL;
273 
274  new_seekhead->segment_offset = segment_offset;
275 
276  if (numelements > 0) {
277  new_seekhead->filepos = avio_tell(pb);
278  // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
279  // and size, and 3 bytes to guarantee that an EBML void element
280  // will fit afterwards
281  new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
282  new_seekhead->max_entries = numelements;
283  put_ebml_void(pb, new_seekhead->reserved_size);
284  }
285  return new_seekhead;
286 }
287 
288 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
289 {
290  mkv_seekhead_entry *entries = seekhead->entries;
291 
292  // don't store more elements than we reserved space for
293  if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
294  return -1;
295 
296  entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
297  if (entries == NULL)
298  return AVERROR(ENOMEM);
299 
300  entries[seekhead->num_entries ].elementid = elementid;
301  entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
302 
303  seekhead->entries = entries;
304  return 0;
305 }
306 
316 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
317 {
318  ebml_master metaseek, seekentry;
319  int64_t currentpos;
320  int i;
321 
322  currentpos = avio_tell(pb);
323 
324  if (seekhead->reserved_size > 0) {
325  if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
326  currentpos = -1;
327  goto fail;
328  }
329  }
330 
331  metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
332  for (i = 0; i < seekhead->num_entries; i++) {
333  mkv_seekhead_entry *entry = &seekhead->entries[i];
334 
336 
338  put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
339  put_ebml_id(pb, entry->elementid);
340 
342  end_ebml_master(pb, seekentry);
343  }
344  end_ebml_master(pb, metaseek);
345 
346  if (seekhead->reserved_size > 0) {
347  uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
348  put_ebml_void(pb, remaining);
349  avio_seek(pb, currentpos, SEEK_SET);
350 
351  currentpos = seekhead->filepos;
352  }
353 fail:
354  av_free(seekhead->entries);
355  av_free(seekhead);
356 
357  return currentpos;
358 }
359 
360 static mkv_cues * mkv_start_cues(int64_t segment_offset)
361 {
362  mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
363  if (cues == NULL)
364  return NULL;
365 
366  cues->segment_offset = segment_offset;
367  return cues;
368 }
369 
370 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
371 {
372  mkv_cuepoint *entries = cues->entries;
373 
374  if (ts < 0)
375  return 0;
376 
377  entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
378  if (entries == NULL)
379  return AVERROR(ENOMEM);
380 
381  entries[cues->num_entries ].pts = ts;
382  entries[cues->num_entries ].tracknum = stream + 1;
383  entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
384 
385  cues->entries = entries;
386  return 0;
387 }
388 
389 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
390 {
391  ebml_master cues_element;
392  int64_t currentpos;
393  int i, j;
394 
395  currentpos = avio_tell(pb);
396  cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
397 
398  for (i = 0; i < cues->num_entries; i++) {
399  ebml_master cuepoint, track_positions;
400  mkv_cuepoint *entry = &cues->entries[i];
401  uint64_t pts = entry->pts;
402 
403  cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
405 
406  // put all the entries from different tracks that have the exact same
407  // timestamp into the same CuePoint
408  for (j = 0; j < num_tracks; j++)
409  tracks[j].has_cue = 0;
410  for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
411  int tracknum = entry[j].tracknum - 1;
412  av_assert0(tracknum>=0 && tracknum<num_tracks);
413  if (tracks[tracknum].has_cue)
414  continue;
415  tracks[tracknum].has_cue = 1;
417  put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
418  put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
419  end_ebml_master(pb, track_positions);
420  }
421  i += j - 1;
422  end_ebml_master(pb, cuepoint);
423  }
424  end_ebml_master(pb, cues_element);
425 
426  return currentpos;
427 }
428 
430 {
431  uint8_t *header_start[3];
432  int header_len[3];
433  int first_header_size;
434  int j;
435 
436  if (codec->codec_id == AV_CODEC_ID_VORBIS)
437  first_header_size = 30;
438  else
439  first_header_size = 42;
440 
442  first_header_size, header_start, header_len) < 0) {
443  av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
444  return -1;
445  }
446 
447  avio_w8(pb, 2); // number packets - 1
448  for (j = 0; j < 2; j++) {
449  put_xiph_size(pb, header_len[j]);
450  }
451  for (j = 0; j < 3; j++)
452  avio_write(pb, header_start[j], header_len[j]);
453 
454  return 0;
455 }
456 
457 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
458 {
459  MPEG4AudioConfig mp4ac;
460 
461  if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
462  codec->extradata_size * 8, 1) < 0) {
463  av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
464  return;
465  }
466 
467  *sample_rate = mp4ac.sample_rate;
468  *output_sample_rate = mp4ac.ext_sample_rate;
469 }
470 
471 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
472 {
473  AVIOContext *dyn_cp;
474  uint8_t *codecpriv;
475  int ret, codecpriv_size;
476 
477  ret = avio_open_dyn_buf(&dyn_cp);
478  if(ret < 0)
479  return ret;
480 
481  if (native_id) {
482  if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
483  ret = put_xiph_codecpriv(s, dyn_cp, codec);
484  else if (codec->codec_id == AV_CODEC_ID_FLAC)
485  ret = ff_flac_write_header(dyn_cp, codec, 1);
486  else if (codec->codec_id == AV_CODEC_ID_H264)
487  ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
488  else if (codec->codec_id == AV_CODEC_ID_ALAC) {
489  if (codec->extradata_size < 36) {
490  av_log(s, AV_LOG_ERROR,
491  "Invalid extradata found, ALAC expects a 36-byte "
492  "QuickTime atom.");
493  ret = AVERROR_INVALIDDATA;
494  } else
495  avio_write(dyn_cp, codec->extradata + 12,
496  codec->extradata_size - 12);
497  }
498  else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
499  avio_write(dyn_cp, codec->extradata, codec->extradata_size);
500  } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
501  if (qt_id) {
502  if (!codec->codec_tag)
504  if (codec->extradata_size) {
507  ) {
508  int i;
509  avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
510  avio_wl32(dyn_cp, codec->codec_tag);
511  for(i=0; i<0x5a-8; i++)
512  avio_w8(dyn_cp, 0);
513  }
514  avio_write(dyn_cp, codec->extradata, codec->extradata_size);
515  }
516  } else {
517  if (!codec->codec_tag)
519  if (!codec->codec_tag) {
520  av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
521  avcodec_get_name(codec->codec_id));
522  ret = AVERROR(EINVAL);
523  }
524 
525  ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
526  }
527 
528  } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
529  unsigned int tag;
531  if (!tag) {
532  av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
533  avcodec_get_name(codec->codec_id));
534  ret = AVERROR(EINVAL);
535  }
536  if (!codec->codec_tag)
537  codec->codec_tag = tag;
538 
539  ff_put_wav_header(dyn_cp, codec);
540  }
541 
542  codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
543  if (codecpriv_size)
544  put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
545  av_free(codecpriv);
546  return ret;
547 }
548 
550 {
551  MatroskaMuxContext *mkv = s->priv_data;
552  AVIOContext *pb = s->pb;
553  ebml_master tracks;
554  int i, j, ret, default_stream_exists = 0;
555 
557  if (ret < 0) return ret;
558 
559  tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
560  for (i = 0; i < s->nb_streams; i++) {
561  AVStream *st = s->streams[i];
562  default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
563  }
564  for (i = 0; i < s->nb_streams; i++) {
565  AVStream *st = s->streams[i];
566  AVCodecContext *codec = st->codec;
567  ebml_master subinfo, track;
568  int native_id = 0;
569  int qt_id = 0;
570  int bit_depth = av_get_bits_per_sample(codec->codec_id);
571  int sample_rate = codec->sample_rate;
572  int output_sample_rate = 0;
574 
575  if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
576  mkv->have_attachments = 1;
577  continue;
578  }
579 
580  if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
581  bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
582  if (!bit_depth)
583  bit_depth = codec->bits_per_coded_sample;
584 
585  if (codec->codec_id == AV_CODEC_ID_AAC)
586  get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
587 
590  put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
591  put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
592 
593  if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
595  tag = av_dict_get(st->metadata, "language", NULL, 0);
596  put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
597 
598  if (default_stream_exists) {
600  }
603 
604  // look for a codec ID string specific to mkv to use,
605  // if none are found, use AVI codes
606  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
607  if (ff_mkv_codec_tags[j].id == codec->codec_id) {
609  native_id = 1;
610  break;
611  }
612  }
613 
614  if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
615  codec->codec_id == AV_CODEC_ID_VORBIS)) {
616  av_log(s, AV_LOG_ERROR,
617  "Only VP8 video and Vorbis audio are supported for WebM.\n");
618  return AVERROR(EINVAL);
619  }
620 
621  switch (codec->codec_type) {
622  case AVMEDIA_TYPE_VIDEO:
624  if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
626  else
628 
629  if (!native_id &&
632  || codec->codec_id == AV_CODEC_ID_SVQ1
633  || codec->codec_id == AV_CODEC_ID_SVQ3
634  || codec->codec_id == AV_CODEC_ID_CINEPAK))
635  qt_id = 1;
636 
637  if (qt_id)
638  put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
639  else if (!native_id) {
640  // if there is no mkv-specific codec ID, use VFW mode
641  put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
642  mkv->tracks[i].write_dts = 1;
643  }
644 
645  subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
646  // XXX: interlace flag?
649 
650  if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
651  (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
652  // save stereo mode flag
653  uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
654 
655  for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
656  if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
657  st_mode = j;
658  break;
659  }
660 
661  if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
662  || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
663  av_log(s, AV_LOG_ERROR,
664  "The specified stereo mode is not valid.\n");
665  return AVERROR(EINVAL);
666  } else
668  }
669 
670  if (st->sample_aspect_ratio.num) {
671  int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
672  if (d_width > INT_MAX) {
673  av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
674  return AVERROR(EINVAL);
675  }
678  }
679 
680  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
681  uint32_t color_space = av_le2ne32(codec->codec_tag);
682  put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
683  }
684  end_ebml_master(pb, subinfo);
685  break;
686 
687  case AVMEDIA_TYPE_AUDIO:
689 
690  if (!native_id)
691  // no mkv-specific ID, use ACM mode
692  put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
693 
694  subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
697  if (output_sample_rate)
698  put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
699  if (bit_depth)
701  end_ebml_master(pb, subinfo);
702  break;
703 
706  if (!native_id) {
707  av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
708  return AVERROR(ENOSYS);
709  }
710  break;
711  default:
712  av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
713  break;
714  }
715  ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
716  if (ret < 0) return ret;
717 
718  end_ebml_master(pb, track);
719 
720  // ms precision is the de-facto standard timescale for mkv files
721  avpriv_set_pts_info(st, 64, 1, 1000);
722  }
723  end_ebml_master(pb, tracks);
724  return 0;
725 }
726 
728 {
729  MatroskaMuxContext *mkv = s->priv_data;
730  AVIOContext *pb = s->pb;
731  ebml_master chapters, editionentry;
732  AVRational scale = {1, 1E9};
733  int i, ret;
734 
735  if (!s->nb_chapters)
736  return 0;
737 
739  if (ret < 0) return ret;
740 
741  chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
742  editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
745  for (i = 0; i < s->nb_chapters; i++) {
746  ebml_master chapteratom, chapterdisplay;
747  AVChapter *c = s->chapters[i];
749 
750  chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
753  av_rescale_q(c->start, c->time_base, scale));
755  av_rescale_q(c->end, c->time_base, scale));
758  if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
759  chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
762  end_ebml_master(pb, chapterdisplay);
763  }
764  end_ebml_master(pb, chapteratom);
765  }
766  end_ebml_master(pb, editionentry);
767  end_ebml_master(pb, chapters);
768  return 0;
769 }
770 
772 {
773  uint8_t *key = av_strdup(t->key);
774  uint8_t *p = key;
775  const uint8_t *lang = NULL;
777 
778  if ((p = strrchr(p, '-')) &&
779  (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
780  *p = 0;
781 
782  p = key;
783  while (*p) {
784  if (*p == ' ')
785  *p = '_';
786  else if (*p >= 'a' && *p <= 'z')
787  *p -= 'a' - 'A';
788  p++;
789  }
790 
793  if (lang)
796  end_ebml_master(pb, tag);
797 
798  av_freep(&key);
799 }
800 
801 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
802  unsigned int uid, ebml_master *tags)
803 {
804  MatroskaMuxContext *mkv = s->priv_data;
805  ebml_master tag, targets;
807  int ret;
808 
809  if (!tags->pos) {
811  if (ret < 0) return ret;
812 
813  *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
814  }
815 
816  tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
817  targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
818  if (elementid)
819  put_ebml_uint(s->pb, elementid, uid);
820  end_ebml_master(s->pb, targets);
821 
822  while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
823  if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
824  mkv_write_simpletag(s->pb, t);
825 
826  end_ebml_master(s->pb, tag);
827  return 0;
828 }
829 
831 {
833 
834  while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
835  if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
836  return 1;
837 
838  return 0;
839 }
840 
842 {
843  ebml_master tags = {0};
844  int i, ret;
845 
847 
848  if (mkv_check_tag(s->metadata)) {
849  ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
850  if (ret < 0) return ret;
851  }
852 
853  for (i = 0; i < s->nb_streams; i++) {
854  AVStream *st = s->streams[i];
855 
856  if (!mkv_check_tag(st->metadata))
857  continue;
858 
859  ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
860  if (ret < 0) return ret;
861  }
862 
863  for (i = 0; i < s->nb_chapters; i++) {
864  AVChapter *ch = s->chapters[i];
865 
866  if (!mkv_check_tag(ch->metadata))
867  continue;
868 
869  ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
870  if (ret < 0) return ret;
871  }
872 
873  if (tags.pos)
874  end_ebml_master(s->pb, tags);
875  return 0;
876 }
877 
879 {
880  MatroskaMuxContext *mkv = s->priv_data;
881  AVIOContext *pb = s->pb;
882  ebml_master attachments;
883  AVLFG c;
884  int i, ret;
885 
886  if (!mkv->have_attachments)
887  return 0;
888 
890 
892  if (ret < 0) return ret;
893 
894  attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
895 
896  for (i = 0; i < s->nb_streams; i++) {
897  AVStream *st = s->streams[i];
898  ebml_master attached_file;
900  const char *mimetype = NULL;
901  uint64_t fileuid;
902 
904  continue;
905 
906  attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
907 
908  if (t = av_dict_get(st->metadata, "title", NULL, 0))
910  if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
911  av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
912  return AVERROR(EINVAL);
913  }
915  if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
916  mimetype = t->value;
917  else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
918  int i;
919  for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
920  if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
921  mimetype = ff_mkv_mime_tags[i].str;
922  break;
923  }
924  }
925  if (!mimetype) {
926  av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
927  "it cannot be deduced from the codec id.\n", i);
928  return AVERROR(EINVAL);
929  }
930 
931  if (st->codec->flags & CODEC_FLAG_BITEXACT) {
932  struct AVSHA *sha = av_sha_alloc();
933  uint8_t digest[20];
934  if (!sha)
935  return AVERROR(ENOMEM);
936  av_sha_init(sha, 160);
938  av_sha_final(sha, digest);
939  av_free(sha);
940  fileuid = AV_RL64(digest);
941  } else {
942  fileuid = av_lfg_get(&c);
943  }
944  av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
945  fileuid, i);
946 
949  put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
950  end_ebml_master(pb, attached_file);
951  }
952  end_ebml_master(pb, attachments);
953 
954  return 0;
955 }
956 
958 {
959  MatroskaMuxContext *mkv = s->priv_data;
960  AVIOContext *pb = s->pb;
961  ebml_master ebml_header, segment_info;
963  int ret, i;
964 
965  if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
966  else mkv->mode = MODE_MATROSKAv2;
967 
968  if (s->avoid_negative_ts < 0)
969  s->avoid_negative_ts = 1;
970 
971  for (i = 0; i < s->nb_streams; i++)
972  if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
973  s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
975  s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
976  s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
977  s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
978  av_log(s, AV_LOG_ERROR,
979  "The Matroska muxer does not yet support muxing %s\n",
981  return AVERROR_PATCHWELCOME;
982  }
983 
984  mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
985  if (!mkv->tracks)
986  return AVERROR(ENOMEM);
987 
988  ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
996  end_ebml_master(pb, ebml_header);
997 
999  mkv->segment_offset = avio_tell(pb);
1000 
1001  // we write 2 seek heads - one at the end of the file to point to each
1002  // cluster, and one at the beginning to point to all other level one
1003  // elements (including the seek head at the end of the file), which
1004  // isn't more than 10 elements if we only write one of each other
1005  // currently defined level 1 element
1006  mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1007  if (!mkv->main_seekhead)
1008  return AVERROR(ENOMEM);
1009 
1011  if (ret < 0) return ret;
1012 
1013  segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1015  if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1017  if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1018  uint32_t segment_uid[4];
1019  AVLFG lfg;
1020 
1022 
1023  for (i = 0; i < 4; i++)
1024  segment_uid[i] = av_lfg_get(&lfg);
1025 
1028  put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1029  }
1030 
1031  if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1032  // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1033  int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1034  uint8_t date_utc_buf[8];
1035  AV_WB64(date_utc_buf, date_utc);
1036  put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1037  }
1038 
1039  // reserve space for the duration
1040  mkv->duration = 0;
1041  mkv->duration_offset = avio_tell(pb);
1042  put_ebml_void(pb, 11); // assumes double-precision float to be written
1043  end_ebml_master(pb, segment_info);
1044 
1045  ret = mkv_write_tracks(s);
1046  if (ret < 0) return ret;
1047 
1048  if (mkv->mode != MODE_WEBM) {
1049  ret = mkv_write_chapters(s);
1050  if (ret < 0) return ret;
1051 
1052  ret = mkv_write_tags(s);
1053  if (ret < 0) return ret;
1054 
1055  ret = mkv_write_attachments(s);
1056  if (ret < 0) return ret;
1057  }
1058 
1059  if (!s->pb->seekable)
1061 
1062  mkv->cues = mkv_start_cues(mkv->segment_offset);
1063  if (mkv->cues == NULL)
1064  return AVERROR(ENOMEM);
1065 
1067  mkv->cur_audio_pkt.size = 0;
1068  mkv->audio_buffer_size = 0;
1069  mkv->cluster_pos = -1;
1070 
1071  avio_flush(pb);
1072  return 0;
1073 }
1074 
1075 static int mkv_blockgroup_size(int pkt_size)
1076 {
1077  int size = pkt_size + 4;
1078  size += ebml_num_size(size);
1079  size += 2; // EBML ID for block and block duration
1080  size += 8; // max size of block duration
1081  size += ebml_num_size(size);
1082  size += 1; // blockgroup EBML ID
1083  return size;
1084 }
1085 
1086 static int ass_get_duration(const uint8_t *p)
1087 {
1088  int sh, sm, ss, sc, eh, em, es, ec;
1089  uint64_t start, end;
1090 
1091  if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1092  &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1093  return 0;
1094  start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1095  end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1096  return end - start;
1097 }
1098 
1100 {
1101  MatroskaMuxContext *mkv = s->priv_data;
1102  int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1103  uint8_t *start, *end, *data = pkt->data;
1104  ebml_master blockgroup;
1105  char buffer[2048];
1106 
1107  while (data_size) {
1108  int duration = ass_get_duration(data);
1109  max_duration = FFMAX(duration, max_duration);
1110  end = memchr(data, '\n', data_size);
1111  size = line_size = end ? end-data+1 : data_size;
1112  size -= end ? (end[-1]=='\r')+1 : 0;
1113  start = data;
1114  for (i=0; i<3; i++, start++)
1115  if (!(start = memchr(start, ',', size-(start-data))))
1116  return max_duration;
1117  size -= start - data;
1118  sscanf(data, "Dialogue: %d,", &layer);
1119  i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1120  s->streams[pkt->stream_index]->nb_frames, layer);
1121  size = FFMIN(i+size, sizeof(buffer));
1122  memcpy(buffer+i, start, size-i);
1123 
1124  av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1125  "pts %" PRId64 ", duration %d\n",
1126  avio_tell(pb), size, pkt->pts, duration);
1129  put_ebml_num(pb, size+4, 0);
1130  avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1131  avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1132  avio_w8(pb, 0);
1133  avio_write(pb, buffer, size);
1135  end_ebml_master(pb, blockgroup);
1136 
1137  data += line_size;
1138  data_size -= line_size;
1139  }
1140 
1141  return max_duration;
1142 }
1143 
1145  unsigned int blockid, AVPacket *pkt, int flags)
1146 {
1147  MatroskaMuxContext *mkv = s->priv_data;
1148  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1149  uint8_t *data = NULL;
1150  int offset = 0, size = pkt->size;
1151  int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1152 
1153  av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1154  "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1155  avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1156  if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1157  (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1158  ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1159  else
1160  data = pkt->data;
1161 
1162  if (codec->codec_id == AV_CODEC_ID_PRORES) {
1163  /* Matroska specification requires to remove the first QuickTime atom
1164  */
1165  size -= 8;
1166  offset = 8;
1167  }
1168 
1169  put_ebml_id(pb, blockid);
1170  put_ebml_num(pb, size+4, 0);
1171  avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1172  avio_wb16(pb, ts - mkv->cluster_pts);
1173  avio_w8(pb, flags);
1174  avio_write(pb, data + offset, size);
1175  if (data != pkt->data)
1176  av_free(data);
1177 }
1178 
1179 static int srt_get_duration(uint8_t **buf)
1180 {
1181  int i, duration = 0;
1182 
1183  for (i=0; i<2 && !duration; i++) {
1184  int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1185  if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1186  &s_hour, &s_min, &s_sec, &s_hsec,
1187  &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1188  s_min += 60*s_hour; e_min += 60*e_hour;
1189  s_sec += 60*s_min; e_sec += 60*e_min;
1190  s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1191  duration = e_hsec - s_hsec;
1192  }
1193  *buf += ff_subtitles_next_line(*buf);
1194  }
1195  return duration;
1196 }
1197 
1199 {
1200  ebml_master blockgroup;
1201  AVPacket pkt2 = *pkt;
1202  int64_t duration = srt_get_duration(&pkt2.data);
1203  pkt2.size -= pkt2.data - pkt->data;
1204 
1205  blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1206  mkv_blockgroup_size(pkt2.size));
1207  mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1209  end_ebml_master(pb, blockgroup);
1210 
1211  return duration;
1212 }
1213 
1215 {
1216  MatroskaMuxContext *mkv = s->priv_data;
1217  int bufsize;
1218  uint8_t *dyn_buf;
1219 
1220  if (!mkv->dyn_bc)
1221  return;
1222 
1223  bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1224  avio_write(s->pb, dyn_buf, bufsize);
1225  av_free(dyn_buf);
1226  mkv->dyn_bc = NULL;
1227 }
1228 
1230 {
1231  MatroskaMuxContext *mkv = s->priv_data;
1232  AVIOContext *pb = s->pb;
1233  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1234  int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1235  int duration = pkt->duration;
1236  int ret;
1237  int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1238 
1239  if (ts == AV_NOPTS_VALUE) {
1240  av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1241  return AVERROR(EINVAL);
1242  }
1243 
1244  if (!s->pb->seekable) {
1245  if (!mkv->dyn_bc) {
1246  if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1247  av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1248  return ret;
1249  }
1250  }
1251  pb = mkv->dyn_bc;
1252  }
1253 
1254  if (mkv->cluster_pos == -1) {
1255  mkv->cluster_pos = avio_tell(s->pb);
1258  mkv->cluster_pts = FFMAX(0, ts);
1259  }
1260 
1261  if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1262  mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1263  } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1264  duration = mkv_write_ass_blocks(s, pb, pkt);
1265  } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1266  duration = mkv_write_srt_blocks(s, pb, pkt);
1267  } else {
1269  /* For backward compatibility, prefer convergence_duration. */
1270  if (pkt->convergence_duration > 0) {
1271  duration = pkt->convergence_duration;
1272  }
1273  mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1275  end_ebml_master(pb, blockgroup);
1276  }
1277 
1278  if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1279  ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1280  if (ret < 0) return ret;
1281  }
1282 
1283  mkv->duration = FFMAX(mkv->duration, ts + duration);
1284  return 0;
1285 }
1286 
1288 {
1289  uint8_t *data = mkv->cur_audio_pkt.data;
1290  mkv->cur_audio_pkt = *pkt;
1291  mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
1292  if (!mkv->cur_audio_pkt.data)
1293  return AVERROR(ENOMEM);
1294 
1295  memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
1296  mkv->cur_audio_pkt.size = pkt->size;
1297  return 0;
1298 }
1299 
1301 {
1302  MatroskaMuxContext *mkv = s->priv_data;
1303  AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1304  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1305  int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1306  int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1307  int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1308 
1309  // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1310  // after 4k and on a keyframe
1311  if (mkv->cluster_pos != -1 &&
1312  ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1313  || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1314  || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1315  av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1316  " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1317  end_ebml_master(pb, mkv->cluster);
1318  mkv->cluster_pos = -1;
1319  if (mkv->dyn_bc)
1320  mkv_flush_dynbuf(s);
1321  }
1322 
1323  // check if we have an audio packet cached
1324  if (mkv->cur_audio_pkt.size > 0) {
1325  ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1326  mkv->cur_audio_pkt.size = 0;
1327  if (ret < 0) {
1328  av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1329  return ret;
1330  }
1331  }
1332 
1333  // buffer an audio packet to ensure the packet containing the video
1334  // keyframe's timecode is contained in the same cluster for WebM
1335  if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
1336  ret = mkv_copy_packet(mkv, pkt);
1337  else
1338  ret = mkv_write_packet_internal(s, pkt);
1339  return ret;
1340 }
1341 
1343 {
1344  MatroskaMuxContext *mkv = s->priv_data;
1345  AVIOContext *pb = s->pb;
1346  int64_t currentpos, cuespos;
1347  int ret;
1348 
1349  // check if we have an audio packet cached
1350  if (mkv->cur_audio_pkt.size > 0) {
1351  ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1352  mkv->cur_audio_pkt.size = 0;
1353  if (ret < 0) {
1354  av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1355  return ret;
1356  }
1357  }
1358 
1359  if (mkv->dyn_bc) {
1360  end_ebml_master(mkv->dyn_bc, mkv->cluster);
1361  mkv_flush_dynbuf(s);
1362  } else if (mkv->cluster_pos != -1) {
1363  end_ebml_master(pb, mkv->cluster);
1364  }
1365 
1366  if (pb->seekable) {
1367  if (mkv->cues->num_entries) {
1368  cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1369 
1371  if (ret < 0) return ret;
1372  }
1373 
1375 
1376  // update the duration
1377  av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1378  currentpos = avio_tell(pb);
1379  avio_seek(pb, mkv->duration_offset, SEEK_SET);
1381 
1382  avio_seek(pb, currentpos, SEEK_SET);
1383  }
1384 
1385  end_ebml_master(pb, mkv->segment);
1386  av_free(mkv->tracks);
1387  av_freep(&mkv->cues->entries);
1388  av_freep(&mkv->cues);
1390 
1391  return 0;
1392 }
1393 
1394 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1395 {
1396  int i;
1397  for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1398  if (ff_mkv_codec_tags[i].id == codec_id)
1399  return 1;
1400 
1401  if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1402  enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1403  if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1404  return 1;
1405  }
1406 
1407  return 0;
1408 }
1409 
1411  { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1412  { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1413  { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1414  { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1415  { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1416  { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1417  { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1418  { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1419  { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1420  { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1421  { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1422  { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1423  { AV_CODEC_ID_WAVPACK, 0xFFFFFFFF },
1424  { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1425 };
1426 
1428  { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1429  { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1430  { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1431  { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1432  { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1433  { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1434 };
1435 
1436 #if CONFIG_MATROSKA_MUXER
1437 AVOutputFormat ff_matroska_muxer = {
1438  .name = "matroska",
1439  .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1440  .mime_type = "video/x-matroska",
1441  .extensions = "mkv",
1442  .priv_data_size = sizeof(MatroskaMuxContext),
1443  .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1445  .video_codec = CONFIG_LIBX264_ENCODER ?
1452  .codec_tag = (const AVCodecTag* const []){
1455  },
1456  .subtitle_codec = AV_CODEC_ID_SSA,
1457  .query_codec = mkv_query_codec,
1458 };
1459 #endif
1460 
1461 #if CONFIG_WEBM_MUXER
1462 AVOutputFormat ff_webm_muxer = {
1463  .name = "webm",
1464  .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1465  .mime_type = "video/webm",
1466  .extensions = "webm",
1467  .priv_data_size = sizeof(MatroskaMuxContext),
1468  .audio_codec = AV_CODEC_ID_VORBIS,
1469  .video_codec = AV_CODEC_ID_VP8,
1475 };
1476 #endif
1477 
1478 #if CONFIG_MATROSKA_AUDIO_MUXER
1479 AVOutputFormat ff_matroska_audio_muxer = {
1480  .name = "matroska",
1481  .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1482  .mime_type = "audio/x-matroska",
1483  .extensions = "mka",
1484  .priv_data_size = sizeof(MatroskaMuxContext),
1485  .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1486  AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1487  .video_codec = AV_CODEC_ID_NONE,
1492  .codec_tag = (const AVCodecTag* const []){
1494  },
1495 };
1496 #endif