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;
91 #define MODE_MATROSKAv2 0x01
92 #define MODE_WEBM 0x02
94 typedef struct MatroskaMuxContext {
99 int64_t segment_offset;
101 int64_t cluster_pos; ///< file offset of the current cluster
103 int64_t duration_offset;
105 mkv_seekhead *main_seekhead;
109 AVPacket cur_audio_pkt;
111 int have_attachments;
113 int reserve_cues_space;
114 int cluster_size_limit;
116 int64_t cluster_time_limit;
118 uint32_t chapter_id_offset;
120 } MatroskaMuxContext;
123 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
124 * offset, 4 bytes for target EBML ID */
125 #define MAX_SEEKENTRY_SIZE 21
127 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
129 #define MAX_CUETRACKPOS_SIZE 42
131 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
132 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
134 /** Seek preroll value for opus */
135 #define OPUS_SEEK_PREROLL 80000000
138 static int ebml_id_size(unsigned int id)
140 return (av_log2(id+1)-1)/7+1;
143 static void put_ebml_id(AVIOContext *pb, unsigned int id)
145 int i = ebml_id_size(id);
147 avio_w8(pb, (uint8_t)(id >> (i*8)));
151 * Write an EBML size meaning "unknown size".
153 * @param bytes The number of bytes the size should occupy (maximum: 8).
155 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
157 av_assert0(bytes <= 8);
158 avio_w8(pb, 0x1ff >> bytes);
159 ffio_fill(pb, 0xff, bytes - 1);
163 * Calculate how many bytes are needed to represent a given number in EBML.
165 static int ebml_num_size(uint64_t num)
168 while ((num+1) >> bytes*7) bytes++;
173 * Write a number in EBML variable length format.
175 * @param bytes The number of bytes that need to be used to write the number.
176 * If zero, any number of bytes can be used.
178 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
180 int i, needed_bytes = ebml_num_size(num);
182 // sizes larger than this are currently undefined in EBML
183 av_assert0(num < (1ULL<<56)-1);
186 // don't care how many bytes are used, so use the min
187 bytes = needed_bytes;
188 // the bytes needed to write the given size would exceed the bytes
189 // that we need to use, so write unknown size. This shouldn't happen.
190 av_assert0(bytes >= needed_bytes);
192 num |= 1ULL << bytes*7;
193 for (i = bytes - 1; i >= 0; i--)
194 avio_w8(pb, (uint8_t)(num >> i*8));
197 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
201 while (tmp>>=8) bytes++;
203 put_ebml_id(pb, elementid);
204 put_ebml_num(pb, bytes, 0);
205 for (i = bytes - 1; i >= 0; i--)
206 avio_w8(pb, (uint8_t)(val >> i*8));
209 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
212 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
214 while (tmp>>=8) bytes++;
216 put_ebml_id(pb, elementid);
217 put_ebml_num(pb, bytes, 0);
218 for (i = bytes - 1; i >= 0; i--)
219 avio_w8(pb, (uint8_t)(val >> i*8));
222 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
224 put_ebml_id(pb, elementid);
225 put_ebml_num(pb, 8, 0);
226 avio_wb64(pb, av_double2int(val));
229 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
230 const void *buf, int size)
232 put_ebml_id(pb, elementid);
233 put_ebml_num(pb, size, 0);
234 avio_write(pb, buf, size);
237 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
239 put_ebml_binary(pb, elementid, str, strlen(str));
243 * Write a void element of a given size. Useful for reserving space in
244 * the file to be written to later.
246 * @param size The number of bytes to reserve, which must be at least 2.
248 static void put_ebml_void(AVIOContext *pb, uint64_t size)
250 int64_t currentpos = avio_tell(pb);
252 av_assert0(size >= 2);
254 put_ebml_id(pb, EBML_ID_VOID);
255 // we need to subtract the length needed to store the size from the
256 // size we need to reserve so 2 cases, we use 8 bytes to store the
257 // size if possible, 1 byte otherwise
259 put_ebml_num(pb, size-1, 0);
261 put_ebml_num(pb, size-9, 8);
262 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
265 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
267 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
268 put_ebml_id(pb, elementid);
269 put_ebml_size_unknown(pb, bytes);
270 return (ebml_master){ avio_tell(pb), bytes };
273 static void end_ebml_master(AVIOContext *pb, ebml_master master)
275 int64_t pos = avio_tell(pb);
277 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
279 put_ebml_num(pb, pos - master.pos, master.sizebytes);
280 avio_seek(pb, pos, SEEK_SET);
283 static void put_xiph_size(AVIOContext *pb, int size)
285 ffio_fill(pb, 255, size / 255);
286 avio_w8(pb, size % 255);
290 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
291 * elements. If a maximum number of elements is specified, enough space
292 * will be reserved at the current file location to write a seek head of
295 * @param segment_offset The absolute offset to the position in the file
296 * where the segment begins.
297 * @param numelements The maximum number of elements that will be indexed
298 * by this seek head, 0 if unlimited.
300 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
302 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
303 if (new_seekhead == NULL)
306 new_seekhead->segment_offset = segment_offset;
308 if (numelements > 0) {
309 new_seekhead->filepos = avio_tell(pb);
310 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
311 // and size, and 3 bytes to guarantee that an EBML void element
312 // will fit afterwards
313 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
314 new_seekhead->max_entries = numelements;
315 put_ebml_void(pb, new_seekhead->reserved_size);
320 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
322 mkv_seekhead_entry *entries = seekhead->entries;
324 // don't store more elements than we reserved space for
325 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
328 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
330 return AVERROR(ENOMEM);
331 seekhead->entries = entries;
333 seekhead->entries[seekhead->num_entries].elementid = elementid;
334 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
340 * Write the seek head to the file and free it. If a maximum number of
341 * elements was specified to mkv_start_seekhead(), the seek head will
342 * be written at the location reserved for it. Otherwise, it is written
343 * at the current location in the file.
345 * @return The file offset where the seekhead was written,
346 * -1 if an error occurred.
348 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
350 ebml_master metaseek, seekentry;
354 currentpos = avio_tell(pb);
356 if (seekhead->reserved_size > 0) {
357 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
363 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
364 for (i = 0; i < seekhead->num_entries; i++) {
365 mkv_seekhead_entry *entry = &seekhead->entries[i];
367 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
369 put_ebml_id(pb, MATROSKA_ID_SEEKID);
370 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
371 put_ebml_id(pb, entry->elementid);
373 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
374 end_ebml_master(pb, seekentry);
376 end_ebml_master(pb, metaseek);
378 if (seekhead->reserved_size > 0) {
379 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
380 put_ebml_void(pb, remaining);
381 avio_seek(pb, currentpos, SEEK_SET);
383 currentpos = seekhead->filepos;
386 av_freep(&seekhead->entries);
392 static mkv_cues * mkv_start_cues(int64_t segment_offset)
394 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
398 cues->segment_offset = segment_offset;
402 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos,
405 mkv_cuepoint *entries = cues->entries;
410 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
412 return AVERROR(ENOMEM);
413 cues->entries = entries;
415 cues->entries[cues->num_entries].pts = ts;
416 cues->entries[cues->num_entries].tracknum = stream + 1;
417 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
418 cues->entries[cues->num_entries].relative_pos = relative_pos;
419 cues->entries[cues->num_entries++].duration = duration;
424 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
426 ebml_master cues_element;
430 currentpos = avio_tell(pb);
431 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
433 for (i = 0; i < cues->num_entries; i++) {
434 ebml_master cuepoint, track_positions;
435 mkv_cuepoint *entry = &cues->entries[i];
436 uint64_t pts = entry->pts;
438 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
439 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
441 // put all the entries from different tracks that have the exact same
442 // timestamp into the same CuePoint
443 for (j = 0; j < num_tracks; j++)
444 tracks[j].has_cue = 0;
445 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
446 int tracknum = entry[j].tracknum - 1;
447 av_assert0(tracknum>=0 && tracknum<num_tracks);
448 if (tracks[tracknum].has_cue)
450 tracks[tracknum].has_cue = 1;
451 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
452 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
453 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
454 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
455 if (entry[j].duration != -1)
456 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
457 end_ebml_master(pb, track_positions);
460 end_ebml_master(pb, cuepoint);
462 end_ebml_master(pb, cues_element);
467 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
469 uint8_t *header_start[3];
471 int first_header_size;
474 if (codec->codec_id == AV_CODEC_ID_VORBIS)
475 first_header_size = 30;
477 first_header_size = 42;
479 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
480 first_header_size, header_start, header_len) < 0) {
481 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
485 avio_w8(pb, 2); // number packets - 1
486 for (j = 0; j < 2; j++) {
487 put_xiph_size(pb, header_len[j]);
489 for (j = 0; j < 3; j++)
490 avio_write(pb, header_start[j], header_len[j]);
495 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
497 if (codec->extradata && codec->extradata_size == 2)
498 avio_write(pb, codec->extradata, 2);
500 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
504 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
506 MPEG4AudioConfig mp4ac;
508 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
509 codec->extradata_size * 8, 1) < 0) {
510 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
514 *sample_rate = mp4ac.sample_rate;
515 *output_sample_rate = mp4ac.ext_sample_rate;
518 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
522 int ret, codecpriv_size;
524 ret = avio_open_dyn_buf(&dyn_cp);
529 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
530 ret = put_xiph_codecpriv(s, dyn_cp, codec);
531 else if (codec->codec_id == AV_CODEC_ID_FLAC)
532 ret = ff_flac_write_header(dyn_cp, codec, 1);
533 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
534 ret = put_wv_codecpriv(dyn_cp, codec);
535 else if (codec->codec_id == AV_CODEC_ID_H264)
536 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
537 else if (codec->codec_id == AV_CODEC_ID_HEVC)
538 ret = ff_isom_write_hvcc(dyn_cp, codec->extradata, codec->extradata_size, 0);
539 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
540 if (codec->extradata_size < 36) {
541 av_log(s, AV_LOG_ERROR,
542 "Invalid extradata found, ALAC expects a 36-byte "
544 ret = AVERROR_INVALIDDATA;
546 avio_write(dyn_cp, codec->extradata + 12,
547 codec->extradata_size - 12);
548 } else if (codec->codec_id == AV_CODEC_ID_PRORES &&
549 ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == AV_CODEC_ID_PRORES) {
550 avio_wl32(dyn_cp, codec->codec_tag);
552 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
553 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
554 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
556 if (!codec->codec_tag)
557 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
558 if (codec->extradata_size) {
559 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
560 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata+4)) != codec->codec_id
563 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
564 avio_wl32(dyn_cp, codec->codec_tag);
565 for(i=0; i<0x5a-8; i++)
568 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
571 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
572 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
573 avcodec_get_name(codec->codec_id));
575 if (!codec->codec_tag)
576 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
577 if (!codec->codec_tag) {
578 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
579 avcodec_get_name(codec->codec_id));
580 ret = AVERROR(EINVAL);
583 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
586 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
588 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
590 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
591 avcodec_get_name(codec->codec_id));
592 ret = AVERROR(EINVAL);
594 if (!codec->codec_tag)
595 codec->codec_tag = tag;
597 ff_put_wav_header(dyn_cp, codec, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
600 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
602 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
607 static int mkv_write_tracks(AVFormatContext *s)
609 MatroskaMuxContext *mkv = s->priv_data;
610 AVIOContext *pb = s->pb;
612 int i, j, ret, default_stream_exists = 0;
614 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
615 if (ret < 0) return ret;
617 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
618 for (i = 0; i < s->nb_streams; i++) {
619 AVStream *st = s->streams[i];
620 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
622 for (i = 0; i < s->nb_streams; i++) {
623 AVStream *st = s->streams[i];
624 AVCodecContext *codec = st->codec;
625 ebml_master subinfo, track;
628 int bit_depth = av_get_bits_per_sample(codec->codec_id);
629 int sample_rate = codec->sample_rate;
630 int output_sample_rate = 0;
631 int display_width_div = 1;
632 int display_height_div = 1;
633 AVDictionaryEntry *tag;
635 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
636 mkv->have_attachments = 1;
640 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
641 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
643 bit_depth = codec->bits_per_coded_sample;
645 if (codec->codec_id == AV_CODEC_ID_AAC)
646 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
648 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
649 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
650 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
651 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
653 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
654 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
655 tag = av_dict_get(st->metadata, "language", NULL, 0);
656 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
657 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
658 } else if (tag && tag->value) {
659 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
662 // The default value for TRACKFLAGDEFAULT is 1, so add element
663 // if we need to clear it.
664 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
665 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
667 if (st->disposition & AV_DISPOSITION_FORCED)
668 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
670 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
671 const char *codec_id;
672 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
673 codec_id = "D_WEBVTT/CAPTIONS";
674 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
675 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
676 codec_id = "D_WEBVTT/DESCRIPTIONS";
677 native_id = MATROSKA_TRACK_TYPE_METADATA;
678 } else if (st->disposition & AV_DISPOSITION_METADATA) {
679 codec_id = "D_WEBVTT/METADATA";
680 native_id = MATROSKA_TRACK_TYPE_METADATA;
682 codec_id = "D_WEBVTT/SUBTITLES";
683 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
685 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
687 // look for a codec ID string specific to mkv to use,
688 // if none are found, use AVI codes
689 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
690 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
691 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
698 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->delay && codec->codec_id == AV_CODEC_ID_OPUS) {
699 // mkv->tracks[i].ts_offset = av_rescale_q(codec->delay,
700 // (AVRational){ 1, codec->sample_rate },
703 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
704 av_rescale_q(codec->delay, (AVRational){ 1, codec->sample_rate },
705 (AVRational){ 1, 1000000000 }));
707 if (codec->codec_id == AV_CODEC_ID_OPUS) {
708 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
711 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
712 codec->codec_id == AV_CODEC_ID_VP9 ||
713 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
714 codec->codec_id == AV_CODEC_ID_VORBIS ||
715 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
716 av_log(s, AV_LOG_ERROR,
717 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
718 return AVERROR(EINVAL);
721 switch (codec->codec_type) {
722 case AVMEDIA_TYPE_VIDEO:
723 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
724 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
725 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
727 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
730 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
731 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
732 || codec->codec_id == AV_CODEC_ID_SVQ1
733 || codec->codec_id == AV_CODEC_ID_SVQ3
734 || codec->codec_id == AV_CODEC_ID_CINEPAK))
738 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
739 else if (!native_id) {
740 // if there is no mkv-specific codec ID, use VFW mode
741 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
742 mkv->tracks[i].write_dts = 1;
745 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
746 // XXX: interlace flag?
747 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
748 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
750 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
751 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
752 // save stereo mode flag
753 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
755 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
756 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
761 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
762 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
763 av_log(s, AV_LOG_ERROR,
764 "The specified stereo mode is not valid.\n");
765 return AVERROR(EINVAL);
767 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
774 display_width_div = 2;
780 display_height_div = 2;
785 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
786 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
787 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
788 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
791 if (st->sample_aspect_ratio.num) {
792 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
793 if (d_width > INT_MAX) {
794 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
795 return AVERROR(EINVAL);
797 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
798 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
799 } else if (display_width_div != 1 || display_height_div != 1) {
800 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
801 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
804 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
805 uint32_t color_space = av_le2ne32(codec->codec_tag);
806 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
808 end_ebml_master(pb, subinfo);
811 case AVMEDIA_TYPE_AUDIO:
812 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
815 // no mkv-specific ID, use ACM mode
816 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
818 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
819 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
820 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
821 if (output_sample_rate)
822 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
824 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
825 end_ebml_master(pb, subinfo);
828 case AVMEDIA_TYPE_SUBTITLE:
830 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
831 return AVERROR(ENOSYS);
834 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
835 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
837 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
840 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
841 return AVERROR(EINVAL);
844 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
845 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
846 if (ret < 0) return ret;
849 end_ebml_master(pb, track);
851 // ms precision is the de-facto standard timescale for mkv files
852 avpriv_set_pts_info(st, 64, 1, 1000);
854 end_ebml_master(pb, tracks);
858 static int mkv_write_chapters(AVFormatContext *s)
860 MatroskaMuxContext *mkv = s->priv_data;
861 AVIOContext *pb = s->pb;
862 ebml_master chapters, editionentry;
863 AVRational scale = {1, 1E9};
866 if (!s->nb_chapters || mkv->wrote_chapters)
869 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
870 if (ret < 0) return ret;
872 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
873 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
874 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
875 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
876 for (i = 0; i < s->nb_chapters; i++) {
877 ebml_master chapteratom, chapterdisplay;
878 AVChapter *c = s->chapters[i];
879 AVDictionaryEntry *t = NULL;
881 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
882 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
883 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
884 av_rescale_q(c->start, c->time_base, scale));
885 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
886 av_rescale_q(c->end, c->time_base, scale));
887 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
888 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
889 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
890 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
891 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
892 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
893 end_ebml_master(pb, chapterdisplay);
895 end_ebml_master(pb, chapteratom);
897 end_ebml_master(pb, editionentry);
898 end_ebml_master(pb, chapters);
900 mkv->wrote_chapters = 1;
904 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
906 uint8_t *key = av_strdup(t->key);
908 const uint8_t *lang = NULL;
911 if ((p = strrchr(p, '-')) &&
912 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
919 else if (*p >= 'a' && *p <= 'z')
924 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
925 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
927 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
928 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
929 end_ebml_master(pb, tag);
934 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
935 unsigned int uid, ebml_master *tags)
937 MatroskaMuxContext *mkv = s->priv_data;
938 ebml_master tag, targets;
939 AVDictionaryEntry *t = NULL;
943 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
944 if (ret < 0) return ret;
946 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
949 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
950 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
952 put_ebml_uint(s->pb, elementid, uid);
953 end_ebml_master(s->pb, targets);
955 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
956 if (av_strcasecmp(t->key, "title") &&
957 av_strcasecmp(t->key, "stereo_mode") &&
958 av_strcasecmp(t->key, "encoding_tool"))
959 mkv_write_simpletag(s->pb, t);
961 end_ebml_master(s->pb, tag);
965 static int mkv_check_tag(AVDictionary *m)
967 AVDictionaryEntry *t = NULL;
969 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
970 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
976 static int mkv_write_tags(AVFormatContext *s)
978 MatroskaMuxContext *mkv = s->priv_data;
979 ebml_master tags = {0};
982 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
984 if (mkv_check_tag(s->metadata)) {
985 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
986 if (ret < 0) return ret;
989 for (i = 0; i < s->nb_streams; i++) {
990 AVStream *st = s->streams[i];
992 if (!mkv_check_tag(st->metadata))
995 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
996 if (ret < 0) return ret;
999 for (i = 0; i < s->nb_chapters; i++) {
1000 AVChapter *ch = s->chapters[i];
1002 if (!mkv_check_tag(ch->metadata))
1005 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
1006 if (ret < 0) return ret;
1010 end_ebml_master(s->pb, tags);
1014 static int mkv_write_attachments(AVFormatContext *s)
1016 MatroskaMuxContext *mkv = s->priv_data;
1017 AVIOContext *pb = s->pb;
1018 ebml_master attachments;
1022 if (!mkv->have_attachments)
1025 av_lfg_init(&c, av_get_random_seed());
1027 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1028 if (ret < 0) return ret;
1030 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1032 for (i = 0; i < s->nb_streams; i++) {
1033 AVStream *st = s->streams[i];
1034 ebml_master attached_file;
1035 AVDictionaryEntry *t;
1036 const char *mimetype = NULL;
1039 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1042 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1044 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1045 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1046 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1047 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1048 return AVERROR(EINVAL);
1050 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1051 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1052 mimetype = t->value;
1053 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1055 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1056 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1057 mimetype = ff_mkv_mime_tags[i].str;
1062 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1063 "it cannot be deduced from the codec id.\n", i);
1064 return AVERROR(EINVAL);
1067 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
1068 struct AVSHA *sha = av_sha_alloc();
1071 return AVERROR(ENOMEM);
1072 av_sha_init(sha, 160);
1073 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1074 av_sha_final(sha, digest);
1076 fileuid = AV_RL64(digest);
1078 fileuid = av_lfg_get(&c);
1080 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1083 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1084 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1085 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1086 end_ebml_master(pb, attached_file);
1088 end_ebml_master(pb, attachments);
1093 static int mkv_write_header(AVFormatContext *s)
1095 MatroskaMuxContext *mkv = s->priv_data;
1096 AVIOContext *pb = s->pb;
1097 ebml_master ebml_header, segment_info;
1098 AVDictionaryEntry *tag;
1099 int ret, i, version = 2;
1101 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1102 else mkv->mode = MODE_MATROSKAv2;
1104 if (s->avoid_negative_ts < 0)
1105 s->avoid_negative_ts = 1;
1107 if (mkv->mode != MODE_WEBM ||
1108 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1109 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1112 for (i = 0; i < s->nb_streams; i++) {
1113 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1114 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1115 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1116 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1117 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1118 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1119 av_log(s, AV_LOG_ERROR,
1120 "The Matroska muxer does not yet support muxing %s\n",
1121 avcodec_get_name(s->streams[i]->codec->codec_id));
1122 return AVERROR_PATCHWELCOME;
1124 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_OPUS ||
1125 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1126 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1130 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1132 return AVERROR(ENOMEM);
1134 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1135 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1136 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1137 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1138 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1139 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1140 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1141 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1142 end_ebml_master(pb, ebml_header);
1144 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1145 mkv->segment_offset = avio_tell(pb);
1147 // we write 2 seek heads - one at the end of the file to point to each
1148 // cluster, and one at the beginning to point to all other level one
1149 // elements (including the seek head at the end of the file), which
1150 // isn't more than 10 elements if we only write one of each other
1151 // currently defined level 1 element
1152 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1153 if (!mkv->main_seekhead)
1154 return AVERROR(ENOMEM);
1156 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1157 if (ret < 0) return ret;
1159 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1160 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1161 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1162 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1163 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1164 uint32_t segment_uid[4];
1167 av_lfg_init(&lfg, av_get_random_seed());
1169 for (i = 0; i < 4; i++)
1170 segment_uid[i] = av_lfg_get(&lfg);
1172 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1173 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1174 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1176 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1177 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1179 const char *ident = "Lavf";
1180 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1181 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1184 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1185 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1186 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1187 uint8_t date_utc_buf[8];
1188 AV_WB64(date_utc_buf, date_utc);
1189 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1192 // reserve space for the duration
1194 mkv->duration_offset = avio_tell(pb);
1195 put_ebml_void(pb, 11); // assumes double-precision float to be written
1196 end_ebml_master(pb, segment_info);
1198 ret = mkv_write_tracks(s);
1199 if (ret < 0) return ret;
1201 for (i = 0; i < s->nb_chapters; i++)
1202 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1204 if (mkv->mode != MODE_WEBM) {
1205 ret = mkv_write_chapters(s);
1206 if (ret < 0) return ret;
1208 ret = mkv_write_tags(s);
1209 if (ret < 0) return ret;
1211 ret = mkv_write_attachments(s);
1212 if (ret < 0) return ret;
1215 if (!s->pb->seekable)
1216 mkv_write_seekhead(pb, mkv->main_seekhead);
1218 mkv->cues = mkv_start_cues(mkv->segment_offset);
1219 if (mkv->cues == NULL)
1220 return AVERROR(ENOMEM);
1222 if (pb->seekable && mkv->reserve_cues_space) {
1223 mkv->cues_pos = avio_tell(pb);
1224 put_ebml_void(pb, mkv->reserve_cues_space);
1227 av_init_packet(&mkv->cur_audio_pkt);
1228 mkv->cur_audio_pkt.size = 0;
1229 mkv->cluster_pos = -1;
1233 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1234 // after 4k and on a keyframe
1236 if (mkv->cluster_time_limit < 0)
1237 mkv->cluster_time_limit = 5000;
1238 if (mkv->cluster_size_limit < 0)
1239 mkv->cluster_size_limit = 5 * 1024 * 1024;
1241 if (mkv->cluster_time_limit < 0)
1242 mkv->cluster_time_limit = 1000;
1243 if (mkv->cluster_size_limit < 0)
1244 mkv->cluster_size_limit = 32 * 1024;
1250 static int mkv_blockgroup_size(int pkt_size)
1252 int size = pkt_size + 4;
1253 size += ebml_num_size(size);
1254 size += 2; // EBML ID for block and block duration
1255 size += 8; // max size of block duration
1256 size += ebml_num_size(size);
1257 size += 1; // blockgroup EBML ID
1261 static int ass_get_duration(const uint8_t *p)
1263 int sh, sm, ss, sc, eh, em, es, ec;
1264 uint64_t start, end;
1266 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1267 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1269 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1270 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1275 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1277 MatroskaMuxContext *mkv = s->priv_data;
1278 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1279 uint8_t *start, *end, *data = pkt->data;
1280 ebml_master blockgroup;
1284 int duration = ass_get_duration(data);
1285 max_duration = FFMAX(duration, max_duration);
1286 end = memchr(data, '\n', data_size);
1287 size = line_size = end ? end-data+1 : data_size;
1288 size -= end ? (end[-1]=='\r')+1 : 0;
1290 for (i=0; i<3; i++, start++)
1291 if (!(start = memchr(start, ',', size-(start-data))))
1292 return max_duration;
1293 size -= start - data;
1294 sscanf(data, "Dialogue: %d,", &layer);
1295 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1296 s->streams[pkt->stream_index]->nb_frames, layer);
1297 size = FFMIN(i+size, sizeof(buffer));
1298 memcpy(buffer+i, start, size-i);
1300 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1301 "pts %" PRId64 ", duration %d\n",
1302 avio_tell(pb), size, pkt->pts, duration);
1303 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1304 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1305 put_ebml_num(pb, size+4, 0);
1306 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1307 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1309 avio_write(pb, buffer, size);
1310 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1311 end_ebml_master(pb, blockgroup);
1314 data_size -= line_size;
1317 return max_duration;
1321 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1328 dst = av_malloc(srclen);
1330 return AVERROR(ENOMEM);
1332 while (srclen >= WV_HEADER_SIZE) {
1335 ret = ff_wv_parse_header(&header, src);
1338 src += WV_HEADER_SIZE;
1339 srclen -= WV_HEADER_SIZE;
1341 if (srclen < header.blocksize) {
1342 ret = AVERROR_INVALIDDATA;
1346 if (header.initial) {
1347 AV_WL32(dst + offset, header.samples);
1350 AV_WL32(dst + offset, header.flags);
1351 AV_WL32(dst + offset + 4, header.crc);
1354 if (!(header.initial && header.final)) {
1355 AV_WL32(dst + offset, header.blocksize);
1359 memcpy(dst + offset, src, header.blocksize);
1360 src += header.blocksize;
1361 srclen -= header.blocksize;
1362 offset += header.blocksize;
1374 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1375 unsigned int blockid, AVPacket *pkt, int flags)
1377 MatroskaMuxContext *mkv = s->priv_data;
1378 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1379 uint8_t *data = NULL, *side_data = NULL;
1380 int offset = 0, size = pkt->size, side_data_size = 0;
1381 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1382 uint64_t additional_id = 0;
1383 int64_t discard_padding = 0;
1384 ebml_master block_group, block_additions, block_more;
1386 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1387 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1388 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1389 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1390 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1391 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1392 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1393 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1394 /* extradata is Annex B, assume the bitstream is too and convert it */
1395 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1396 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1397 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1399 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1405 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1406 /* Matroska specification requires to remove the first QuickTime atom
1412 side_data = av_packet_get_side_data(pkt,
1413 AV_PKT_DATA_SKIP_SAMPLES,
1416 if (side_data && side_data_size >= 10) {
1417 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1418 (AVRational){1, codec->sample_rate},
1419 (AVRational){1, 1000000000});
1422 side_data = av_packet_get_side_data(pkt,
1423 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1426 additional_id = AV_RB64(side_data);
1428 side_data_size -= 8;
1431 if ((side_data_size && additional_id == 1) || discard_padding) {
1432 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1433 blockid = MATROSKA_ID_BLOCK;
1436 put_ebml_id(pb, blockid);
1437 put_ebml_num(pb, size+4, 0);
1438 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1439 avio_wb16(pb, ts - mkv->cluster_pts);
1441 avio_write(pb, data + offset, size);
1442 if (data != pkt->data)
1445 if (discard_padding) {
1446 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1449 if (side_data_size && additional_id == 1) {
1450 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1451 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1452 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1453 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1454 put_ebml_num(pb, side_data_size, 0);
1455 avio_write(pb, side_data, side_data_size);
1456 end_ebml_master(pb, block_more);
1457 end_ebml_master(pb, block_additions);
1459 if ((side_data_size && additional_id == 1) || discard_padding) {
1460 end_ebml_master(pb, block_group);
1464 static int srt_get_duration(uint8_t **buf)
1466 int i, duration = 0;
1468 for (i=0; i<2 && !duration; i++) {
1469 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1470 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1471 &s_hour, &s_min, &s_sec, &s_hsec,
1472 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1473 s_min += 60*s_hour; e_min += 60*e_hour;
1474 s_sec += 60*s_min; e_sec += 60*e_min;
1475 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1476 duration = e_hsec - s_hsec;
1478 *buf += ff_subtitles_next_line(*buf);
1483 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1485 ebml_master blockgroup;
1486 AVPacket pkt2 = *pkt;
1487 int64_t duration = srt_get_duration(&pkt2.data);
1488 pkt2.size -= pkt2.data - pkt->data;
1490 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1491 mkv_blockgroup_size(pkt2.size));
1492 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1493 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1494 end_ebml_master(pb, blockgroup);
1499 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1501 MatroskaMuxContext *mkv = s->priv_data;
1502 ebml_master blockgroup;
1503 int id_size, settings_size, size;
1504 uint8_t *id, *settings;
1505 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1506 const int flags = 0;
1509 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1513 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1516 size = id_size + 1 + settings_size + 1 + pkt->size;
1518 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1519 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1520 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1522 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1524 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1525 put_ebml_num(pb, size+4, 0);
1526 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1527 avio_wb16(pb, ts - mkv->cluster_pts);
1529 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1531 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1532 end_ebml_master(pb, blockgroup);
1534 return pkt->duration;
1537 static void mkv_flush_dynbuf(AVFormatContext *s)
1539 MatroskaMuxContext *mkv = s->priv_data;
1546 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1547 avio_write(s->pb, dyn_buf, bufsize);
1552 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1554 MatroskaMuxContext *mkv = s->priv_data;
1555 AVIOContext *pb = s->pb;
1556 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1557 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1558 int duration = pkt->duration;
1560 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1561 int64_t relative_packet_pos;
1563 if (ts == AV_NOPTS_VALUE) {
1564 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1565 return AVERROR(EINVAL);
1567 ts += mkv->tracks[pkt->stream_index].ts_offset;
1569 if (!s->pb->seekable) {
1571 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1572 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1579 if (mkv->cluster_pos == -1) {
1580 mkv->cluster_pos = avio_tell(s->pb);
1581 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1582 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1583 mkv->cluster_pts = FFMAX(0, ts);
1586 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1588 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1589 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1591 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1592 duration = mkv_write_ass_blocks(s, pb, pkt);
1594 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1595 duration = mkv_write_srt_blocks(s, pb, pkt);
1596 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1597 duration = mkv_write_vtt_blocks(s, pb, pkt);
1599 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1600 /* For backward compatibility, prefer convergence_duration. */
1601 if (pkt->convergence_duration > 0) {
1602 duration = pkt->convergence_duration;
1604 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1605 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1606 end_ebml_master(pb, blockgroup);
1609 if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) || codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1610 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos,
1611 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);
1612 if (ret < 0) return ret;
1615 mkv->duration = FFMAX(mkv->duration, ts + duration);
1619 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1621 MatroskaMuxContext *mkv = s->priv_data;
1622 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1623 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1625 int64_t cluster_time;
1629 if (mkv->tracks[pkt->stream_index].write_dts)
1630 cluster_time = pkt->dts - mkv->cluster_pts;
1632 cluster_time = pkt->pts - mkv->cluster_pts;
1633 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1635 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1636 // after 4k and on a keyframe
1637 if (s->pb->seekable) {
1639 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1642 cluster_size = avio_tell(pb);
1645 if (mkv->cluster_pos != -1 &&
1646 (cluster_size > mkv->cluster_size_limit ||
1647 cluster_time > mkv->cluster_time_limit ||
1648 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1649 cluster_size > 4 * 1024))) {
1650 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1651 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1652 avio_tell(pb), pkt->pts, pkt->dts);
1653 end_ebml_master(pb, mkv->cluster);
1654 mkv->cluster_pos = -1;
1656 mkv_flush_dynbuf(s);
1660 // check if we have an audio packet cached
1661 if (mkv->cur_audio_pkt.size > 0) {
1662 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1663 av_free_packet(&mkv->cur_audio_pkt);
1665 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1670 // buffer an audio packet to ensure the packet containing the video
1671 // keyframe's timecode is contained in the same cluster for WebM
1672 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1673 mkv->cur_audio_pkt = *pkt;
1675 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1676 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1678 ret = av_dup_packet(&mkv->cur_audio_pkt);
1679 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1680 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1683 ret = mkv_write_packet_internal(s, pkt);
1687 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1689 MatroskaMuxContext *mkv = s->priv_data;
1691 if (s->pb->seekable)
1696 if (mkv->cluster_pos != -1) {
1697 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1698 " bytes\n", avio_tell(pb));
1699 end_ebml_master(pb, mkv->cluster);
1700 mkv->cluster_pos = -1;
1702 mkv_flush_dynbuf(s);
1707 return mkv_write_packet(s, pkt);
1710 static int mkv_write_trailer(AVFormatContext *s)
1712 MatroskaMuxContext *mkv = s->priv_data;
1713 AVIOContext *pb = s->pb;
1714 int64_t currentpos, cuespos;
1717 // check if we have an audio packet cached
1718 if (mkv->cur_audio_pkt.size > 0) {
1719 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1720 av_free_packet(&mkv->cur_audio_pkt);
1722 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1728 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1729 mkv_flush_dynbuf(s);
1730 } else if (mkv->cluster_pos != -1) {
1731 end_ebml_master(pb, mkv->cluster);
1734 if (mkv->mode != MODE_WEBM) {
1735 ret = mkv_write_chapters(s);
1736 if (ret < 0) return ret;
1740 if (mkv->cues->num_entries) {
1741 if (mkv->reserve_cues_space) {
1744 currentpos = avio_tell(pb);
1745 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1747 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1748 cues_end = avio_tell(pb);
1749 if (cues_end > cuespos + mkv->reserve_cues_space) {
1750 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1751 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1752 cues_end - cuespos);
1753 return AVERROR(EINVAL);
1756 if (cues_end < cuespos + mkv->reserve_cues_space)
1757 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1759 avio_seek(pb, currentpos, SEEK_SET);
1761 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1764 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1765 if (ret < 0) return ret;
1768 mkv_write_seekhead(pb, mkv->main_seekhead);
1770 // update the duration
1771 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1772 currentpos = avio_tell(pb);
1773 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1774 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1776 avio_seek(pb, currentpos, SEEK_SET);
1779 end_ebml_master(pb, mkv->segment);
1780 av_freep(&mkv->tracks);
1781 av_freep(&mkv->cues->entries);
1782 av_freep(&mkv->cues);
1787 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1790 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1791 if (ff_mkv_codec_tags[i].id == codec_id)
1794 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1795 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1796 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1803 static const AVCodecTag additional_audio_tags[] = {
1804 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1805 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1806 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1807 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1808 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1809 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1810 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1811 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1812 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1813 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1814 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1815 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1816 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1819 static const AVCodecTag additional_video_tags[] = {
1820 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1821 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1822 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1823 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1824 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1825 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1828 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1829 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1830 static const AVOption options[] = {
1831 { "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 },
1832 { "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 },
1833 { "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 },
1837 #if CONFIG_MATROSKA_MUXER
1838 static const AVClass matroska_class = {
1839 .class_name = "matroska muxer",
1840 .item_name = av_default_item_name,
1842 .version = LIBAVUTIL_VERSION_INT,
1845 AVOutputFormat ff_matroska_muxer = {
1847 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1848 .mime_type = "video/x-matroska",
1849 .extensions = "mkv",
1850 .priv_data_size = sizeof(MatroskaMuxContext),
1851 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1852 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1853 .video_codec = CONFIG_LIBX264_ENCODER ?
1854 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1855 .write_header = mkv_write_header,
1856 .write_packet = mkv_write_flush_packet,
1857 .write_trailer = mkv_write_trailer,
1858 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1859 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1860 .codec_tag = (const AVCodecTag* const []){
1861 ff_codec_bmp_tags, ff_codec_wav_tags,
1862 additional_audio_tags, additional_video_tags, 0
1865 .subtitle_codec = AV_CODEC_ID_SSA,
1867 .subtitle_codec = AV_CODEC_ID_ASS,
1869 .query_codec = mkv_query_codec,
1870 .priv_class = &matroska_class,
1874 #if CONFIG_WEBM_MUXER
1875 static const AVClass webm_class = {
1876 .class_name = "webm muxer",
1877 .item_name = av_default_item_name,
1879 .version = LIBAVUTIL_VERSION_INT,
1882 AVOutputFormat ff_webm_muxer = {
1884 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1885 .mime_type = "video/webm",
1886 .extensions = "webm",
1887 .priv_data_size = sizeof(MatroskaMuxContext),
1888 .audio_codec = AV_CODEC_ID_VORBIS,
1889 .video_codec = AV_CODEC_ID_VP8,
1890 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1891 .write_header = mkv_write_header,
1892 .write_packet = mkv_write_flush_packet,
1893 .write_trailer = mkv_write_trailer,
1894 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1895 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1896 .priv_class = &webm_class,
1900 #if CONFIG_MATROSKA_AUDIO_MUXER
1901 static const AVClass mka_class = {
1902 .class_name = "matroska audio muxer",
1903 .item_name = av_default_item_name,
1905 .version = LIBAVUTIL_VERSION_INT,
1907 AVOutputFormat ff_matroska_audio_muxer = {
1909 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1910 .mime_type = "audio/x-matroska",
1911 .extensions = "mka",
1912 .priv_data_size = sizeof(MatroskaMuxContext),
1913 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1914 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1915 .video_codec = AV_CODEC_ID_NONE,
1916 .write_header = mkv_write_header,
1917 .write_packet = mkv_write_flush_packet,
1918 .write_trailer = mkv_write_trailer,
1919 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1921 .codec_tag = (const AVCodecTag* const []){
1922 ff_codec_wav_tags, additional_audio_tags, 0
1924 .priv_class = &mka_class,