3 * Copyright (c) 2007 David Conrad
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "avio_internal.h"
28 #include "avlanguage.h"
34 #include "subtitles.h"
37 #include "libavutil/avstring.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lfg.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/random_seed.h"
45 #include "libavutil/samplefmt.h"
46 #include "libavutil/sha.h"
48 #include "libavcodec/xiph.h"
49 #include "libavcodec/mpeg4audio.h"
50 #include "libavcodec/internal.h"
52 typedef struct ebml_master {
53 int64_t pos; ///< absolute offset in the file where the master's elements start
54 int sizebytes; ///< how many bytes were reserved for the size
57 typedef struct mkv_seekhead_entry {
58 unsigned int elementid;
62 typedef struct mkv_seekhead {
64 int64_t segment_offset; ///< the file offset to the beginning of the segment
65 int reserved_size; ///< -1 if appending to file
67 mkv_seekhead_entry *entries;
74 int64_t cluster_pos; ///< file offset of the cluster containing the block
75 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
76 int64_t duration; ///< duration of the block according to time base
80 int64_t segment_offset;
81 mkv_cuepoint *entries;
90 #define MODE_MATROSKAv2 0x01
91 #define MODE_WEBM 0x02
93 typedef struct MatroskaMuxContext {
98 int64_t segment_offset;
100 int64_t cluster_pos; ///< file offset of the current cluster
102 int64_t duration_offset;
104 mkv_seekhead *main_seekhead;
108 AVPacket cur_audio_pkt;
110 int have_attachments;
112 int reserve_cues_space;
113 int cluster_size_limit;
115 int64_t cluster_time_limit;
117 uint32_t chapter_id_offset;
119 } MatroskaMuxContext;
122 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
123 * offset, 4 bytes for target EBML ID */
124 #define MAX_SEEKENTRY_SIZE 21
126 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
128 #define MAX_CUETRACKPOS_SIZE 42
130 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
131 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
133 /** Seek preroll value for opus */
134 #define OPUS_SEEK_PREROLL 80000000
137 static int ebml_id_size(unsigned int id)
139 return (av_log2(id+1)-1)/7+1;
142 static void put_ebml_id(AVIOContext *pb, unsigned int id)
144 int i = ebml_id_size(id);
146 avio_w8(pb, (uint8_t)(id >> (i*8)));
150 * Write an EBML size meaning "unknown size".
152 * @param bytes The number of bytes the size should occupy (maximum: 8).
154 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
156 av_assert0(bytes <= 8);
157 avio_w8(pb, 0x1ff >> bytes);
158 ffio_fill(pb, 0xff, bytes - 1);
162 * Calculate how many bytes are needed to represent a given number in EBML.
164 static int ebml_num_size(uint64_t num)
167 while ((num+1) >> bytes*7) bytes++;
172 * Write a number in EBML variable length format.
174 * @param bytes The number of bytes that need to be used to write the number.
175 * If zero, any number of bytes can be used.
177 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
179 int i, needed_bytes = ebml_num_size(num);
181 // sizes larger than this are currently undefined in EBML
182 av_assert0(num < (1ULL<<56)-1);
185 // don't care how many bytes are used, so use the min
186 bytes = needed_bytes;
187 // the bytes needed to write the given size would exceed the bytes
188 // that we need to use, so write unknown size. This shouldn't happen.
189 av_assert0(bytes >= needed_bytes);
191 num |= 1ULL << bytes*7;
192 for (i = bytes - 1; i >= 0; i--)
193 avio_w8(pb, (uint8_t)(num >> i*8));
196 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
200 while (tmp>>=8) bytes++;
202 put_ebml_id(pb, elementid);
203 put_ebml_num(pb, bytes, 0);
204 for (i = bytes - 1; i >= 0; i--)
205 avio_w8(pb, (uint8_t)(val >> i*8));
208 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
211 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
213 while (tmp>>=8) bytes++;
215 put_ebml_id(pb, elementid);
216 put_ebml_num(pb, bytes, 0);
217 for (i = bytes - 1; i >= 0; i--)
218 avio_w8(pb, (uint8_t)(val >> i*8));
221 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
223 put_ebml_id(pb, elementid);
224 put_ebml_num(pb, 8, 0);
225 avio_wb64(pb, av_double2int(val));
228 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
229 const void *buf, int size)
231 put_ebml_id(pb, elementid);
232 put_ebml_num(pb, size, 0);
233 avio_write(pb, buf, size);
236 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
238 put_ebml_binary(pb, elementid, str, strlen(str));
242 * Write a void element of a given size. Useful for reserving space in
243 * the file to be written to later.
245 * @param size The number of bytes to reserve, which must be at least 2.
247 static void put_ebml_void(AVIOContext *pb, uint64_t size)
249 int64_t currentpos = avio_tell(pb);
251 av_assert0(size >= 2);
253 put_ebml_id(pb, EBML_ID_VOID);
254 // we need to subtract the length needed to store the size from the
255 // size we need to reserve so 2 cases, we use 8 bytes to store the
256 // size if possible, 1 byte otherwise
258 put_ebml_num(pb, size-1, 0);
260 put_ebml_num(pb, size-9, 8);
261 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
264 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
266 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
267 put_ebml_id(pb, elementid);
268 put_ebml_size_unknown(pb, bytes);
269 return (ebml_master){ avio_tell(pb), bytes };
272 static void end_ebml_master(AVIOContext *pb, ebml_master master)
274 int64_t pos = avio_tell(pb);
276 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
278 put_ebml_num(pb, pos - master.pos, master.sizebytes);
279 avio_seek(pb, pos, SEEK_SET);
282 static void put_xiph_size(AVIOContext *pb, int size)
284 ffio_fill(pb, 255, size / 255);
285 avio_w8(pb, size % 255);
289 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
290 * elements. If a maximum number of elements is specified, enough space
291 * will be reserved at the current file location to write a seek head of
294 * @param segment_offset The absolute offset to the position in the file
295 * where the segment begins.
296 * @param numelements The maximum number of elements that will be indexed
297 * by this seek head, 0 if unlimited.
299 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
301 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
302 if (new_seekhead == NULL)
305 new_seekhead->segment_offset = segment_offset;
307 if (numelements > 0) {
308 new_seekhead->filepos = avio_tell(pb);
309 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
310 // and size, and 3 bytes to guarantee that an EBML void element
311 // will fit afterwards
312 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
313 new_seekhead->max_entries = numelements;
314 put_ebml_void(pb, new_seekhead->reserved_size);
319 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
321 mkv_seekhead_entry *entries = seekhead->entries;
323 // don't store more elements than we reserved space for
324 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
327 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
329 return AVERROR(ENOMEM);
330 seekhead->entries = entries;
332 seekhead->entries[seekhead->num_entries].elementid = elementid;
333 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
339 * Write the seek head to the file and free it. If a maximum number of
340 * elements was specified to mkv_start_seekhead(), the seek head will
341 * be written at the location reserved for it. Otherwise, it is written
342 * at the current location in the file.
344 * @return The file offset where the seekhead was written,
345 * -1 if an error occurred.
347 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
349 ebml_master metaseek, seekentry;
353 currentpos = avio_tell(pb);
355 if (seekhead->reserved_size > 0) {
356 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
362 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
363 for (i = 0; i < seekhead->num_entries; i++) {
364 mkv_seekhead_entry *entry = &seekhead->entries[i];
366 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
368 put_ebml_id(pb, MATROSKA_ID_SEEKID);
369 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
370 put_ebml_id(pb, entry->elementid);
372 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
373 end_ebml_master(pb, seekentry);
375 end_ebml_master(pb, metaseek);
377 if (seekhead->reserved_size > 0) {
378 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
379 put_ebml_void(pb, remaining);
380 avio_seek(pb, currentpos, SEEK_SET);
382 currentpos = seekhead->filepos;
385 av_freep(&seekhead->entries);
391 static mkv_cues * mkv_start_cues(int64_t segment_offset)
393 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
397 cues->segment_offset = segment_offset;
401 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos,
404 mkv_cuepoint *entries = cues->entries;
409 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
411 return AVERROR(ENOMEM);
412 cues->entries = entries;
414 cues->entries[cues->num_entries].pts = ts;
415 cues->entries[cues->num_entries].tracknum = stream + 1;
416 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
417 cues->entries[cues->num_entries].relative_pos = relative_pos;
418 cues->entries[cues->num_entries++].duration = duration;
423 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
425 ebml_master cues_element;
429 currentpos = avio_tell(pb);
430 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
432 for (i = 0; i < cues->num_entries; i++) {
433 ebml_master cuepoint, track_positions;
434 mkv_cuepoint *entry = &cues->entries[i];
435 uint64_t pts = entry->pts;
437 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
438 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
440 // put all the entries from different tracks that have the exact same
441 // timestamp into the same CuePoint
442 for (j = 0; j < num_tracks; j++)
443 tracks[j].has_cue = 0;
444 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
445 int tracknum = entry[j].tracknum - 1;
446 av_assert0(tracknum>=0 && tracknum<num_tracks);
447 if (tracks[tracknum].has_cue)
449 tracks[tracknum].has_cue = 1;
450 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
451 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
452 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
453 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
454 if (entry[j].duration != -1)
455 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
456 end_ebml_master(pb, track_positions);
459 end_ebml_master(pb, cuepoint);
461 end_ebml_master(pb, cues_element);
466 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
468 uint8_t *header_start[3];
470 int first_header_size;
473 if (codec->codec_id == AV_CODEC_ID_VORBIS)
474 first_header_size = 30;
476 first_header_size = 42;
478 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
479 first_header_size, header_start, header_len) < 0) {
480 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
484 avio_w8(pb, 2); // number packets - 1
485 for (j = 0; j < 2; j++) {
486 put_xiph_size(pb, header_len[j]);
488 for (j = 0; j < 3; j++)
489 avio_write(pb, header_start[j], header_len[j]);
494 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
496 if (codec->extradata && codec->extradata_size == 2)
497 avio_write(pb, codec->extradata, 2);
499 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
503 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
505 MPEG4AudioConfig mp4ac;
507 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
508 codec->extradata_size * 8, 1) < 0) {
509 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
513 *sample_rate = mp4ac.sample_rate;
514 *output_sample_rate = mp4ac.ext_sample_rate;
517 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
521 int ret, codecpriv_size;
523 ret = avio_open_dyn_buf(&dyn_cp);
528 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
529 ret = put_xiph_codecpriv(s, dyn_cp, codec);
530 else if (codec->codec_id == AV_CODEC_ID_FLAC)
531 ret = ff_flac_write_header(dyn_cp, codec, 1);
532 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
533 ret = put_wv_codecpriv(dyn_cp, codec);
534 else if (codec->codec_id == AV_CODEC_ID_H264)
535 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
536 else if (codec->codec_id == AV_CODEC_ID_HEVC)
537 ret = ff_isom_write_hvcc(dyn_cp, codec->extradata, codec->extradata_size, 0);
538 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
539 if (codec->extradata_size < 36) {
540 av_log(s, AV_LOG_ERROR,
541 "Invalid extradata found, ALAC expects a 36-byte "
543 ret = AVERROR_INVALIDDATA;
545 avio_write(dyn_cp, codec->extradata + 12,
546 codec->extradata_size - 12);
548 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
549 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
550 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
552 if (!codec->codec_tag)
553 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
554 if (codec->extradata_size) {
555 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
556 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata+4)) != codec->codec_id
559 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
560 avio_wl32(dyn_cp, codec->codec_tag);
561 for(i=0; i<0x5a-8; i++)
564 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
567 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
568 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
569 avcodec_get_name(codec->codec_id));
571 if (!codec->codec_tag)
572 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
573 if (!codec->codec_tag) {
574 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
575 avcodec_get_name(codec->codec_id));
576 ret = AVERROR(EINVAL);
579 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
582 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
584 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
586 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
587 avcodec_get_name(codec->codec_id));
588 ret = AVERROR(EINVAL);
590 if (!codec->codec_tag)
591 codec->codec_tag = tag;
593 ff_put_wav_header(dyn_cp, codec);
596 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
598 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
603 static int mkv_write_tracks(AVFormatContext *s)
605 MatroskaMuxContext *mkv = s->priv_data;
606 AVIOContext *pb = s->pb;
608 int i, j, ret, default_stream_exists = 0;
610 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
611 if (ret < 0) return ret;
613 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
614 for (i = 0; i < s->nb_streams; i++) {
615 AVStream *st = s->streams[i];
616 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
618 for (i = 0; i < s->nb_streams; i++) {
619 AVStream *st = s->streams[i];
620 AVCodecContext *codec = st->codec;
621 ebml_master subinfo, track;
624 int bit_depth = av_get_bits_per_sample(codec->codec_id);
625 int sample_rate = codec->sample_rate;
626 int output_sample_rate = 0;
627 int display_width_div = 1;
628 int display_height_div = 1;
629 AVDictionaryEntry *tag;
631 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
632 mkv->have_attachments = 1;
636 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
637 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
639 bit_depth = codec->bits_per_coded_sample;
641 if (codec->codec_id == AV_CODEC_ID_AAC)
642 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
644 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
645 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
646 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
647 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
649 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
650 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
651 tag = av_dict_get(st->metadata, "language", NULL, 0);
652 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
653 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
654 } else if (tag && tag->value) {
655 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
658 // The default value for TRACKFLAGDEFAULT is 1, so add element
659 // if we need to clear it.
660 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
661 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
663 if (st->disposition & AV_DISPOSITION_FORCED)
664 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
666 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
667 const char *codec_id;
668 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
669 codec_id = "D_WEBVTT/CAPTIONS";
670 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
671 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
672 codec_id = "D_WEBVTT/DESCRIPTIONS";
673 native_id = MATROSKA_TRACK_TYPE_METADATA;
674 } else if (st->disposition & AV_DISPOSITION_METADATA) {
675 codec_id = "D_WEBVTT/METADATA";
676 native_id = MATROSKA_TRACK_TYPE_METADATA;
678 codec_id = "D_WEBVTT/SUBTITLES";
679 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
681 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
683 // look for a codec ID string specific to mkv to use,
684 // if none are found, use AVI codes
685 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
686 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
687 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
694 if (codec->codec_id == AV_CODEC_ID_OPUS) {
695 uint64_t codec_delay =av_rescale_q(codec->delay,
696 (AVRational){1, codec->sample_rate},
697 (AVRational){1, 1000000000});
698 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codec_delay);
699 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
703 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
704 codec->codec_id == AV_CODEC_ID_VP9 ||
705 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
706 codec->codec_id == AV_CODEC_ID_VORBIS ||
707 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
708 av_log(s, AV_LOG_ERROR,
709 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
710 return AVERROR(EINVAL);
713 switch (codec->codec_type) {
714 case AVMEDIA_TYPE_VIDEO:
715 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
716 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
717 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
719 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
722 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
723 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
724 || codec->codec_id == AV_CODEC_ID_SVQ1
725 || codec->codec_id == AV_CODEC_ID_SVQ3
726 || codec->codec_id == AV_CODEC_ID_CINEPAK))
730 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
731 else if (!native_id) {
732 // if there is no mkv-specific codec ID, use VFW mode
733 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
734 mkv->tracks[i].write_dts = 1;
737 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
738 // XXX: interlace flag?
739 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
740 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
742 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
743 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
744 // save stereo mode flag
745 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
747 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
748 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
753 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
754 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
755 av_log(s, AV_LOG_ERROR,
756 "The specified stereo mode is not valid.\n");
757 return AVERROR(EINVAL);
759 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
766 display_width_div = 2;
772 display_height_div = 2;
777 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
778 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
779 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
780 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
783 if (st->sample_aspect_ratio.num) {
784 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
785 if (d_width > INT_MAX) {
786 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
787 return AVERROR(EINVAL);
789 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
790 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
791 } else if (display_width_div != 1 || display_height_div != 1) {
792 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
793 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
796 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
797 uint32_t color_space = av_le2ne32(codec->codec_tag);
798 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
800 end_ebml_master(pb, subinfo);
803 case AVMEDIA_TYPE_AUDIO:
804 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
807 // no mkv-specific ID, use ACM mode
808 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
810 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
811 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
812 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
813 if (output_sample_rate)
814 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
816 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
817 end_ebml_master(pb, subinfo);
820 case AVMEDIA_TYPE_SUBTITLE:
822 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
823 return AVERROR(ENOSYS);
826 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
827 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
829 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
832 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
833 return AVERROR(EINVAL);
836 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
837 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
838 if (ret < 0) return ret;
841 end_ebml_master(pb, track);
843 // ms precision is the de-facto standard timescale for mkv files
844 avpriv_set_pts_info(st, 64, 1, 1000);
846 end_ebml_master(pb, tracks);
850 static int mkv_write_chapters(AVFormatContext *s)
852 MatroskaMuxContext *mkv = s->priv_data;
853 AVIOContext *pb = s->pb;
854 ebml_master chapters, editionentry;
855 AVRational scale = {1, 1E9};
858 if (!s->nb_chapters || mkv->wrote_chapters)
861 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
862 if (ret < 0) return ret;
864 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
865 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
866 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
867 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
868 for (i = 0; i < s->nb_chapters; i++) {
869 ebml_master chapteratom, chapterdisplay;
870 AVChapter *c = s->chapters[i];
871 AVDictionaryEntry *t = NULL;
873 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
874 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
875 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
876 av_rescale_q(c->start, c->time_base, scale));
877 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
878 av_rescale_q(c->end, c->time_base, scale));
879 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
880 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
881 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
882 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
883 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
884 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
885 end_ebml_master(pb, chapterdisplay);
887 end_ebml_master(pb, chapteratom);
889 end_ebml_master(pb, editionentry);
890 end_ebml_master(pb, chapters);
892 mkv->wrote_chapters = 1;
896 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
898 uint8_t *key = av_strdup(t->key);
900 const uint8_t *lang = NULL;
903 if ((p = strrchr(p, '-')) &&
904 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
911 else if (*p >= 'a' && *p <= 'z')
916 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
917 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
919 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
920 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
921 end_ebml_master(pb, tag);
926 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
927 unsigned int uid, ebml_master *tags)
929 MatroskaMuxContext *mkv = s->priv_data;
930 ebml_master tag, targets;
931 AVDictionaryEntry *t = NULL;
935 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
936 if (ret < 0) return ret;
938 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
941 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
942 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
944 put_ebml_uint(s->pb, elementid, uid);
945 end_ebml_master(s->pb, targets);
947 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
948 if (av_strcasecmp(t->key, "title") &&
949 av_strcasecmp(t->key, "stereo_mode") &&
950 av_strcasecmp(t->key, "encoding_tool"))
951 mkv_write_simpletag(s->pb, t);
953 end_ebml_master(s->pb, tag);
957 static int mkv_check_tag(AVDictionary *m)
959 AVDictionaryEntry *t = NULL;
961 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
962 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
968 static int mkv_write_tags(AVFormatContext *s)
970 MatroskaMuxContext *mkv = s->priv_data;
971 ebml_master tags = {0};
974 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
976 if (mkv_check_tag(s->metadata)) {
977 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
978 if (ret < 0) return ret;
981 for (i = 0; i < s->nb_streams; i++) {
982 AVStream *st = s->streams[i];
984 if (!mkv_check_tag(st->metadata))
987 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
988 if (ret < 0) return ret;
991 for (i = 0; i < s->nb_chapters; i++) {
992 AVChapter *ch = s->chapters[i];
994 if (!mkv_check_tag(ch->metadata))
997 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
998 if (ret < 0) return ret;
1002 end_ebml_master(s->pb, tags);
1006 static int mkv_write_attachments(AVFormatContext *s)
1008 MatroskaMuxContext *mkv = s->priv_data;
1009 AVIOContext *pb = s->pb;
1010 ebml_master attachments;
1014 if (!mkv->have_attachments)
1017 av_lfg_init(&c, av_get_random_seed());
1019 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1020 if (ret < 0) return ret;
1022 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1024 for (i = 0; i < s->nb_streams; i++) {
1025 AVStream *st = s->streams[i];
1026 ebml_master attached_file;
1027 AVDictionaryEntry *t;
1028 const char *mimetype = NULL;
1031 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1034 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1036 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1037 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1038 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1039 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1040 return AVERROR(EINVAL);
1042 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1043 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1044 mimetype = t->value;
1045 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1047 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1048 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1049 mimetype = ff_mkv_mime_tags[i].str;
1054 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1055 "it cannot be deduced from the codec id.\n", i);
1056 return AVERROR(EINVAL);
1059 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
1060 struct AVSHA *sha = av_sha_alloc();
1063 return AVERROR(ENOMEM);
1064 av_sha_init(sha, 160);
1065 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1066 av_sha_final(sha, digest);
1068 fileuid = AV_RL64(digest);
1070 fileuid = av_lfg_get(&c);
1072 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1075 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1076 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1077 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1078 end_ebml_master(pb, attached_file);
1080 end_ebml_master(pb, attachments);
1085 static int mkv_write_header(AVFormatContext *s)
1087 MatroskaMuxContext *mkv = s->priv_data;
1088 AVIOContext *pb = s->pb;
1089 ebml_master ebml_header, segment_info;
1090 AVDictionaryEntry *tag;
1093 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1094 else mkv->mode = MODE_MATROSKAv2;
1096 if (s->avoid_negative_ts < 0)
1097 s->avoid_negative_ts = 1;
1099 for (i = 0; i < s->nb_streams; i++)
1100 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1101 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1102 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1103 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1104 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1105 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1106 av_log(s, AV_LOG_ERROR,
1107 "The Matroska muxer does not yet support muxing %s\n",
1108 avcodec_get_name(s->streams[i]->codec->codec_id));
1109 return AVERROR_PATCHWELCOME;
1112 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1114 return AVERROR(ENOMEM);
1116 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1117 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1118 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1119 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1120 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1121 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1122 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 4);
1123 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1124 end_ebml_master(pb, ebml_header);
1126 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1127 mkv->segment_offset = avio_tell(pb);
1129 // we write 2 seek heads - one at the end of the file to point to each
1130 // cluster, and one at the beginning to point to all other level one
1131 // elements (including the seek head at the end of the file), which
1132 // isn't more than 10 elements if we only write one of each other
1133 // currently defined level 1 element
1134 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1135 if (!mkv->main_seekhead)
1136 return AVERROR(ENOMEM);
1138 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1139 if (ret < 0) return ret;
1141 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1142 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1143 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1144 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1145 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1146 uint32_t segment_uid[4];
1149 av_lfg_init(&lfg, av_get_random_seed());
1151 for (i = 0; i < 4; i++)
1152 segment_uid[i] = av_lfg_get(&lfg);
1154 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1155 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1156 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1158 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1159 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1161 const char *ident = "Lavf";
1162 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1163 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1166 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1167 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1168 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1169 uint8_t date_utc_buf[8];
1170 AV_WB64(date_utc_buf, date_utc);
1171 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1174 // reserve space for the duration
1176 mkv->duration_offset = avio_tell(pb);
1177 put_ebml_void(pb, 11); // assumes double-precision float to be written
1178 end_ebml_master(pb, segment_info);
1180 ret = mkv_write_tracks(s);
1181 if (ret < 0) return ret;
1183 for (i = 0; i < s->nb_chapters; i++)
1184 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1186 if (mkv->mode != MODE_WEBM) {
1187 ret = mkv_write_chapters(s);
1188 if (ret < 0) return ret;
1190 ret = mkv_write_tags(s);
1191 if (ret < 0) return ret;
1193 ret = mkv_write_attachments(s);
1194 if (ret < 0) return ret;
1197 if (!s->pb->seekable)
1198 mkv_write_seekhead(pb, mkv->main_seekhead);
1200 mkv->cues = mkv_start_cues(mkv->segment_offset);
1201 if (mkv->cues == NULL)
1202 return AVERROR(ENOMEM);
1204 if (pb->seekable && mkv->reserve_cues_space) {
1205 mkv->cues_pos = avio_tell(pb);
1206 put_ebml_void(pb, mkv->reserve_cues_space);
1209 av_init_packet(&mkv->cur_audio_pkt);
1210 mkv->cur_audio_pkt.size = 0;
1211 mkv->cluster_pos = -1;
1215 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1216 // after 4k and on a keyframe
1218 if (mkv->cluster_time_limit < 0)
1219 mkv->cluster_time_limit = 5000;
1220 if (mkv->cluster_size_limit < 0)
1221 mkv->cluster_size_limit = 5 * 1024 * 1024;
1223 if (mkv->cluster_time_limit < 0)
1224 mkv->cluster_time_limit = 1000;
1225 if (mkv->cluster_size_limit < 0)
1226 mkv->cluster_size_limit = 32 * 1024;
1232 static int mkv_blockgroup_size(int pkt_size)
1234 int size = pkt_size + 4;
1235 size += ebml_num_size(size);
1236 size += 2; // EBML ID for block and block duration
1237 size += 8; // max size of block duration
1238 size += ebml_num_size(size);
1239 size += 1; // blockgroup EBML ID
1243 static int ass_get_duration(const uint8_t *p)
1245 int sh, sm, ss, sc, eh, em, es, ec;
1246 uint64_t start, end;
1248 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1249 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1251 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1252 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1257 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1259 MatroskaMuxContext *mkv = s->priv_data;
1260 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1261 uint8_t *start, *end, *data = pkt->data;
1262 ebml_master blockgroup;
1266 int duration = ass_get_duration(data);
1267 max_duration = FFMAX(duration, max_duration);
1268 end = memchr(data, '\n', data_size);
1269 size = line_size = end ? end-data+1 : data_size;
1270 size -= end ? (end[-1]=='\r')+1 : 0;
1272 for (i=0; i<3; i++, start++)
1273 if (!(start = memchr(start, ',', size-(start-data))))
1274 return max_duration;
1275 size -= start - data;
1276 sscanf(data, "Dialogue: %d,", &layer);
1277 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1278 s->streams[pkt->stream_index]->nb_frames, layer);
1279 size = FFMIN(i+size, sizeof(buffer));
1280 memcpy(buffer+i, start, size-i);
1282 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1283 "pts %" PRId64 ", duration %d\n",
1284 avio_tell(pb), size, pkt->pts, duration);
1285 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1286 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1287 put_ebml_num(pb, size+4, 0);
1288 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1289 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1291 avio_write(pb, buffer, size);
1292 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1293 end_ebml_master(pb, blockgroup);
1296 data_size -= line_size;
1299 return max_duration;
1303 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1310 dst = av_malloc(srclen);
1312 return AVERROR(ENOMEM);
1314 while (srclen >= WV_HEADER_SIZE) {
1317 ret = ff_wv_parse_header(&header, src);
1320 src += WV_HEADER_SIZE;
1321 srclen -= WV_HEADER_SIZE;
1323 if (srclen < header.blocksize) {
1324 ret = AVERROR_INVALIDDATA;
1328 if (header.initial) {
1329 AV_WL32(dst + offset, header.samples);
1332 AV_WL32(dst + offset, header.flags);
1333 AV_WL32(dst + offset + 4, header.crc);
1336 if (!(header.initial && header.final)) {
1337 AV_WL32(dst + offset, header.blocksize);
1341 memcpy(dst + offset, src, header.blocksize);
1342 src += header.blocksize;
1343 srclen -= header.blocksize;
1344 offset += header.blocksize;
1356 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1357 unsigned int blockid, AVPacket *pkt, int flags)
1359 MatroskaMuxContext *mkv = s->priv_data;
1360 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1361 uint8_t *data = NULL, *side_data = NULL;
1362 int offset = 0, size = pkt->size, side_data_size = 0;
1363 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1364 uint64_t additional_id = 0;
1365 int64_t discard_padding = 0;
1366 ebml_master block_group, block_additions, block_more;
1368 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1369 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1370 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1371 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1372 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1373 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1374 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1375 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1376 /* extradata is Annex B, assume the bitstream is too and convert it */
1377 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1378 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1379 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1381 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1387 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1388 /* Matroska specification requires to remove the first QuickTime atom
1394 side_data = av_packet_get_side_data(pkt,
1395 AV_PKT_DATA_SKIP_SAMPLES,
1398 if (side_data && side_data_size >= 10) {
1399 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1400 (AVRational){1, codec->sample_rate},
1401 (AVRational){1, 1000000000});
1404 side_data = av_packet_get_side_data(pkt,
1405 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1408 additional_id = AV_RB64(side_data);
1410 side_data_size -= 8;
1413 if ((side_data_size && additional_id == 1) || discard_padding) {
1414 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1415 blockid = MATROSKA_ID_BLOCK;
1418 put_ebml_id(pb, blockid);
1419 put_ebml_num(pb, size+4, 0);
1420 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1421 avio_wb16(pb, ts - mkv->cluster_pts);
1423 avio_write(pb, data + offset, size);
1424 if (data != pkt->data)
1427 if (discard_padding) {
1428 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1431 if (side_data_size && additional_id == 1) {
1432 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1433 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1434 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1435 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1436 put_ebml_num(pb, side_data_size, 0);
1437 avio_write(pb, side_data, side_data_size);
1438 end_ebml_master(pb, block_more);
1439 end_ebml_master(pb, block_additions);
1441 if ((side_data_size && additional_id == 1) || discard_padding) {
1442 end_ebml_master(pb, block_group);
1446 static int srt_get_duration(uint8_t **buf)
1448 int i, duration = 0;
1450 for (i=0; i<2 && !duration; i++) {
1451 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1452 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1453 &s_hour, &s_min, &s_sec, &s_hsec,
1454 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1455 s_min += 60*s_hour; e_min += 60*e_hour;
1456 s_sec += 60*s_min; e_sec += 60*e_min;
1457 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1458 duration = e_hsec - s_hsec;
1460 *buf += ff_subtitles_next_line(*buf);
1465 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1467 ebml_master blockgroup;
1468 AVPacket pkt2 = *pkt;
1469 int64_t duration = srt_get_duration(&pkt2.data);
1470 pkt2.size -= pkt2.data - pkt->data;
1472 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1473 mkv_blockgroup_size(pkt2.size));
1474 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1475 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1476 end_ebml_master(pb, blockgroup);
1481 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1483 MatroskaMuxContext *mkv = s->priv_data;
1484 ebml_master blockgroup;
1485 int id_size, settings_size, size;
1486 uint8_t *id, *settings;
1487 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1488 const int flags = 0;
1491 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1495 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1498 size = id_size + 1 + settings_size + 1 + pkt->size;
1500 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1501 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1502 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1504 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1506 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1507 put_ebml_num(pb, size+4, 0);
1508 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1509 avio_wb16(pb, ts - mkv->cluster_pts);
1511 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1513 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1514 end_ebml_master(pb, blockgroup);
1516 return pkt->duration;
1519 static void mkv_flush_dynbuf(AVFormatContext *s)
1521 MatroskaMuxContext *mkv = s->priv_data;
1528 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1529 avio_write(s->pb, dyn_buf, bufsize);
1534 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1536 MatroskaMuxContext *mkv = s->priv_data;
1537 AVIOContext *pb = s->pb;
1538 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1539 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1540 int duration = pkt->duration;
1542 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1543 int64_t relative_packet_pos;
1545 if (ts == AV_NOPTS_VALUE) {
1546 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1547 return AVERROR(EINVAL);
1550 if (!s->pb->seekable) {
1552 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1553 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1560 if (mkv->cluster_pos == -1) {
1561 mkv->cluster_pos = avio_tell(s->pb);
1562 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1563 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1564 mkv->cluster_pts = FFMAX(0, ts);
1567 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1569 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1570 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1572 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1573 duration = mkv_write_ass_blocks(s, pb, pkt);
1575 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1576 duration = mkv_write_srt_blocks(s, pb, pkt);
1577 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1578 duration = mkv_write_vtt_blocks(s, pb, pkt);
1580 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1581 /* For backward compatibility, prefer convergence_duration. */
1582 if (pkt->convergence_duration > 0) {
1583 duration = pkt->convergence_duration;
1585 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1586 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1587 end_ebml_master(pb, blockgroup);
1590 if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) || codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1591 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos,
1592 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);
1593 if (ret < 0) return ret;
1596 mkv->duration = FFMAX(mkv->duration, ts + duration);
1600 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1602 MatroskaMuxContext *mkv = s->priv_data;
1603 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1604 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1606 int64_t cluster_time;
1610 if (mkv->tracks[pkt->stream_index].write_dts)
1611 cluster_time = pkt->dts - mkv->cluster_pts;
1613 cluster_time = pkt->pts - mkv->cluster_pts;
1615 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1616 // after 4k and on a keyframe
1617 if (s->pb->seekable) {
1619 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1622 cluster_size = avio_tell(pb);
1625 if (mkv->cluster_pos != -1 &&
1626 (cluster_size > mkv->cluster_size_limit ||
1627 cluster_time > mkv->cluster_time_limit ||
1628 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1629 cluster_size > 4 * 1024))) {
1630 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1631 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1632 avio_tell(pb), pkt->pts, pkt->dts);
1633 end_ebml_master(pb, mkv->cluster);
1634 mkv->cluster_pos = -1;
1636 mkv_flush_dynbuf(s);
1640 // check if we have an audio packet cached
1641 if (mkv->cur_audio_pkt.size > 0) {
1642 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1643 av_free_packet(&mkv->cur_audio_pkt);
1645 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1650 // buffer an audio packet to ensure the packet containing the video
1651 // keyframe's timecode is contained in the same cluster for WebM
1652 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1653 mkv->cur_audio_pkt = *pkt;
1655 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1656 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1658 ret = av_dup_packet(&mkv->cur_audio_pkt);
1659 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1660 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1663 ret = mkv_write_packet_internal(s, pkt);
1667 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1669 MatroskaMuxContext *mkv = s->priv_data;
1671 if (s->pb->seekable)
1676 if (mkv->cluster_pos != -1) {
1677 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1678 " bytes\n", avio_tell(pb));
1679 end_ebml_master(pb, mkv->cluster);
1680 mkv->cluster_pos = -1;
1682 mkv_flush_dynbuf(s);
1687 return mkv_write_packet(s, pkt);
1690 static int mkv_write_trailer(AVFormatContext *s)
1692 MatroskaMuxContext *mkv = s->priv_data;
1693 AVIOContext *pb = s->pb;
1694 int64_t currentpos, cuespos;
1697 // check if we have an audio packet cached
1698 if (mkv->cur_audio_pkt.size > 0) {
1699 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1700 av_free_packet(&mkv->cur_audio_pkt);
1702 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1708 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1709 mkv_flush_dynbuf(s);
1710 } else if (mkv->cluster_pos != -1) {
1711 end_ebml_master(pb, mkv->cluster);
1714 if (mkv->mode != MODE_WEBM) {
1715 ret = mkv_write_chapters(s);
1716 if (ret < 0) return ret;
1720 if (mkv->cues->num_entries) {
1721 if (mkv->reserve_cues_space) {
1724 currentpos = avio_tell(pb);
1725 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1727 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1728 cues_end = avio_tell(pb);
1729 if (cues_end > cuespos + mkv->reserve_cues_space) {
1730 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1731 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1732 cues_end - cuespos);
1733 return AVERROR(EINVAL);
1736 if (cues_end < cuespos + mkv->reserve_cues_space)
1737 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1739 avio_seek(pb, currentpos, SEEK_SET);
1741 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1744 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1745 if (ret < 0) return ret;
1748 mkv_write_seekhead(pb, mkv->main_seekhead);
1750 // update the duration
1751 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1752 currentpos = avio_tell(pb);
1753 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1754 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1756 avio_seek(pb, currentpos, SEEK_SET);
1759 end_ebml_master(pb, mkv->segment);
1760 av_freep(&mkv->tracks);
1761 av_freep(&mkv->cues->entries);
1762 av_freep(&mkv->cues);
1767 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1770 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1771 if (ff_mkv_codec_tags[i].id == codec_id)
1774 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1775 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1776 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1783 static const AVCodecTag additional_audio_tags[] = {
1784 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1785 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1786 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1787 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1788 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1789 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1790 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1791 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1792 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1793 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1794 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1795 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1796 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1799 static const AVCodecTag additional_video_tags[] = {
1800 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1801 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1802 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1803 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1804 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1805 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1808 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1809 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1810 static const AVOption options[] = {
1811 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1812 { "cluster_size_limit", "Store at most the provided amount of bytes in a cluster. ", OFFSET(cluster_size_limit), AV_OPT_TYPE_INT , { .i64 = -1 }, -1, INT_MAX, FLAGS },
1813 { "cluster_time_limit", "Store at most the provided number of milliseconds in a cluster.", OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
1817 #if CONFIG_MATROSKA_MUXER
1818 static const AVClass matroska_class = {
1819 .class_name = "matroska muxer",
1820 .item_name = av_default_item_name,
1822 .version = LIBAVUTIL_VERSION_INT,
1825 AVOutputFormat ff_matroska_muxer = {
1827 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1828 .mime_type = "video/x-matroska",
1829 .extensions = "mkv",
1830 .priv_data_size = sizeof(MatroskaMuxContext),
1831 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1832 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1833 .video_codec = CONFIG_LIBX264_ENCODER ?
1834 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1835 .write_header = mkv_write_header,
1836 .write_packet = mkv_write_flush_packet,
1837 .write_trailer = mkv_write_trailer,
1838 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1839 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1840 .codec_tag = (const AVCodecTag* const []){
1841 ff_codec_bmp_tags, ff_codec_wav_tags,
1842 additional_audio_tags, additional_video_tags, 0
1845 .subtitle_codec = AV_CODEC_ID_SSA,
1847 .subtitle_codec = AV_CODEC_ID_ASS,
1849 .query_codec = mkv_query_codec,
1850 .priv_class = &matroska_class,
1854 #if CONFIG_WEBM_MUXER
1855 static const AVClass webm_class = {
1856 .class_name = "webm muxer",
1857 .item_name = av_default_item_name,
1859 .version = LIBAVUTIL_VERSION_INT,
1862 AVOutputFormat ff_webm_muxer = {
1864 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1865 .mime_type = "video/webm",
1866 .extensions = "webm",
1867 .priv_data_size = sizeof(MatroskaMuxContext),
1868 .audio_codec = AV_CODEC_ID_VORBIS,
1869 .video_codec = AV_CODEC_ID_VP8,
1870 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1871 .write_header = mkv_write_header,
1872 .write_packet = mkv_write_flush_packet,
1873 .write_trailer = mkv_write_trailer,
1874 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1875 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1876 .priv_class = &webm_class,
1880 #if CONFIG_MATROSKA_AUDIO_MUXER
1881 static const AVClass mka_class = {
1882 .class_name = "matroska audio muxer",
1883 .item_name = av_default_item_name,
1885 .version = LIBAVUTIL_VERSION_INT,
1887 AVOutputFormat ff_matroska_audio_muxer = {
1889 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1890 .mime_type = "audio/x-matroska",
1891 .extensions = "mka",
1892 .priv_data_size = sizeof(MatroskaMuxContext),
1893 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1894 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1895 .video_codec = AV_CODEC_ID_NONE,
1896 .write_header = mkv_write_header,
1897 .write_packet = mkv_write_flush_packet,
1898 .write_trailer = mkv_write_trailer,
1899 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1901 .codec_tag = (const AVCodecTag* const []){
1902 ff_codec_wav_tags, additional_audio_tags, 0
1904 .priv_class = &mka_class,