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);
547 } else if (codec->codec_id == AV_CODEC_ID_PRORES &&
548 ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == AV_CODEC_ID_PRORES) {
549 avio_wl32(dyn_cp, codec->codec_tag);
551 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
552 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
553 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
555 if (!codec->codec_tag)
556 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
557 if (codec->extradata_size) {
558 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
559 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata+4)) != codec->codec_id
562 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
563 avio_wl32(dyn_cp, codec->codec_tag);
564 for(i=0; i<0x5a-8; i++)
567 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
570 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
571 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
572 avcodec_get_name(codec->codec_id));
574 if (!codec->codec_tag)
575 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
576 if (!codec->codec_tag) {
577 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
578 avcodec_get_name(codec->codec_id));
579 ret = AVERROR(EINVAL);
582 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
585 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
587 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
589 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
590 avcodec_get_name(codec->codec_id));
591 ret = AVERROR(EINVAL);
593 if (!codec->codec_tag)
594 codec->codec_tag = tag;
596 ff_put_wav_header(dyn_cp, codec, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
599 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
601 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
606 static int mkv_write_tracks(AVFormatContext *s)
608 MatroskaMuxContext *mkv = s->priv_data;
609 AVIOContext *pb = s->pb;
611 int i, j, ret, default_stream_exists = 0;
613 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
614 if (ret < 0) return ret;
616 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
617 for (i = 0; i < s->nb_streams; i++) {
618 AVStream *st = s->streams[i];
619 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
621 for (i = 0; i < s->nb_streams; i++) {
622 AVStream *st = s->streams[i];
623 AVCodecContext *codec = st->codec;
624 ebml_master subinfo, track;
627 int bit_depth = av_get_bits_per_sample(codec->codec_id);
628 int sample_rate = codec->sample_rate;
629 int output_sample_rate = 0;
630 int display_width_div = 1;
631 int display_height_div = 1;
632 AVDictionaryEntry *tag;
634 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
635 mkv->have_attachments = 1;
639 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
640 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
642 bit_depth = codec->bits_per_coded_sample;
644 if (codec->codec_id == AV_CODEC_ID_AAC)
645 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
647 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
648 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
649 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
650 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
652 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
653 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
654 tag = av_dict_get(st->metadata, "language", NULL, 0);
655 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
656 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
657 } else if (tag && tag->value) {
658 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
661 // The default value for TRACKFLAGDEFAULT is 1, so add element
662 // if we need to clear it.
663 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
664 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
666 if (st->disposition & AV_DISPOSITION_FORCED)
667 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
669 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
670 const char *codec_id;
671 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
672 codec_id = "D_WEBVTT/CAPTIONS";
673 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
674 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
675 codec_id = "D_WEBVTT/DESCRIPTIONS";
676 native_id = MATROSKA_TRACK_TYPE_METADATA;
677 } else if (st->disposition & AV_DISPOSITION_METADATA) {
678 codec_id = "D_WEBVTT/METADATA";
679 native_id = MATROSKA_TRACK_TYPE_METADATA;
681 codec_id = "D_WEBVTT/SUBTITLES";
682 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
684 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
686 // look for a codec ID string specific to mkv to use,
687 // if none are found, use AVI codes
688 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
689 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
690 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
697 if (codec->codec_id == AV_CODEC_ID_OPUS) {
698 uint64_t codec_delay =av_rescale_q(codec->delay,
699 (AVRational){1, codec->sample_rate},
700 (AVRational){1, 1000000000});
701 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codec_delay);
702 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
706 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
707 codec->codec_id == AV_CODEC_ID_VP9 ||
708 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
709 codec->codec_id == AV_CODEC_ID_VORBIS ||
710 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
711 av_log(s, AV_LOG_ERROR,
712 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
713 return AVERROR(EINVAL);
716 switch (codec->codec_type) {
717 case AVMEDIA_TYPE_VIDEO:
718 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
719 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
720 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
722 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
725 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
726 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
727 || codec->codec_id == AV_CODEC_ID_SVQ1
728 || codec->codec_id == AV_CODEC_ID_SVQ3
729 || codec->codec_id == AV_CODEC_ID_CINEPAK))
733 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
734 else if (!native_id) {
735 // if there is no mkv-specific codec ID, use VFW mode
736 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
737 mkv->tracks[i].write_dts = 1;
740 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
741 // XXX: interlace flag?
742 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
743 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
745 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
746 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
747 // save stereo mode flag
748 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
750 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
751 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
756 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
757 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
758 av_log(s, AV_LOG_ERROR,
759 "The specified stereo mode is not valid.\n");
760 return AVERROR(EINVAL);
762 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
769 display_width_div = 2;
775 display_height_div = 2;
780 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
781 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
782 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
783 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
786 if (st->sample_aspect_ratio.num) {
787 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
788 if (d_width > INT_MAX) {
789 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
790 return AVERROR(EINVAL);
792 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
793 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
794 } else if (display_width_div != 1 || display_height_div != 1) {
795 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
796 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
799 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
800 uint32_t color_space = av_le2ne32(codec->codec_tag);
801 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
803 end_ebml_master(pb, subinfo);
806 case AVMEDIA_TYPE_AUDIO:
807 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
810 // no mkv-specific ID, use ACM mode
811 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
813 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
814 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
815 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
816 if (output_sample_rate)
817 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
819 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
820 end_ebml_master(pb, subinfo);
823 case AVMEDIA_TYPE_SUBTITLE:
825 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
826 return AVERROR(ENOSYS);
829 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
830 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
832 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
835 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
836 return AVERROR(EINVAL);
839 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
840 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
841 if (ret < 0) return ret;
844 end_ebml_master(pb, track);
846 // ms precision is the de-facto standard timescale for mkv files
847 avpriv_set_pts_info(st, 64, 1, 1000);
849 end_ebml_master(pb, tracks);
853 static int mkv_write_chapters(AVFormatContext *s)
855 MatroskaMuxContext *mkv = s->priv_data;
856 AVIOContext *pb = s->pb;
857 ebml_master chapters, editionentry;
858 AVRational scale = {1, 1E9};
861 if (!s->nb_chapters || mkv->wrote_chapters)
864 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
865 if (ret < 0) return ret;
867 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
868 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
869 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
870 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
871 for (i = 0; i < s->nb_chapters; i++) {
872 ebml_master chapteratom, chapterdisplay;
873 AVChapter *c = s->chapters[i];
874 AVDictionaryEntry *t = NULL;
876 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
877 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
878 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
879 av_rescale_q(c->start, c->time_base, scale));
880 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
881 av_rescale_q(c->end, c->time_base, scale));
882 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
883 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
884 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
885 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
886 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
887 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
888 end_ebml_master(pb, chapterdisplay);
890 end_ebml_master(pb, chapteratom);
892 end_ebml_master(pb, editionentry);
893 end_ebml_master(pb, chapters);
895 mkv->wrote_chapters = 1;
899 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
901 uint8_t *key = av_strdup(t->key);
903 const uint8_t *lang = NULL;
906 if ((p = strrchr(p, '-')) &&
907 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
914 else if (*p >= 'a' && *p <= 'z')
919 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
920 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
922 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
923 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
924 end_ebml_master(pb, tag);
929 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
930 unsigned int uid, ebml_master *tags)
932 MatroskaMuxContext *mkv = s->priv_data;
933 ebml_master tag, targets;
934 AVDictionaryEntry *t = NULL;
938 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
939 if (ret < 0) return ret;
941 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
944 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
945 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
947 put_ebml_uint(s->pb, elementid, uid);
948 end_ebml_master(s->pb, targets);
950 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
951 if (av_strcasecmp(t->key, "title") &&
952 av_strcasecmp(t->key, "stereo_mode") &&
953 av_strcasecmp(t->key, "encoding_tool"))
954 mkv_write_simpletag(s->pb, t);
956 end_ebml_master(s->pb, tag);
960 static int mkv_check_tag(AVDictionary *m)
962 AVDictionaryEntry *t = NULL;
964 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
965 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
971 static int mkv_write_tags(AVFormatContext *s)
973 MatroskaMuxContext *mkv = s->priv_data;
974 ebml_master tags = {0};
977 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
979 if (mkv_check_tag(s->metadata)) {
980 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
981 if (ret < 0) return ret;
984 for (i = 0; i < s->nb_streams; i++) {
985 AVStream *st = s->streams[i];
987 if (!mkv_check_tag(st->metadata))
990 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
991 if (ret < 0) return ret;
994 for (i = 0; i < s->nb_chapters; i++) {
995 AVChapter *ch = s->chapters[i];
997 if (!mkv_check_tag(ch->metadata))
1000 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
1001 if (ret < 0) return ret;
1005 end_ebml_master(s->pb, tags);
1009 static int mkv_write_attachments(AVFormatContext *s)
1011 MatroskaMuxContext *mkv = s->priv_data;
1012 AVIOContext *pb = s->pb;
1013 ebml_master attachments;
1017 if (!mkv->have_attachments)
1020 av_lfg_init(&c, av_get_random_seed());
1022 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1023 if (ret < 0) return ret;
1025 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1027 for (i = 0; i < s->nb_streams; i++) {
1028 AVStream *st = s->streams[i];
1029 ebml_master attached_file;
1030 AVDictionaryEntry *t;
1031 const char *mimetype = NULL;
1034 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1037 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1039 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1040 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1041 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1042 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1043 return AVERROR(EINVAL);
1045 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1046 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1047 mimetype = t->value;
1048 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1050 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1051 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1052 mimetype = ff_mkv_mime_tags[i].str;
1057 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1058 "it cannot be deduced from the codec id.\n", i);
1059 return AVERROR(EINVAL);
1062 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
1063 struct AVSHA *sha = av_sha_alloc();
1066 return AVERROR(ENOMEM);
1067 av_sha_init(sha, 160);
1068 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1069 av_sha_final(sha, digest);
1071 fileuid = AV_RL64(digest);
1073 fileuid = av_lfg_get(&c);
1075 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1078 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1079 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1080 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1081 end_ebml_master(pb, attached_file);
1083 end_ebml_master(pb, attachments);
1088 static int mkv_write_header(AVFormatContext *s)
1090 MatroskaMuxContext *mkv = s->priv_data;
1091 AVIOContext *pb = s->pb;
1092 ebml_master ebml_header, segment_info;
1093 AVDictionaryEntry *tag;
1096 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1097 else mkv->mode = MODE_MATROSKAv2;
1099 if (s->avoid_negative_ts < 0)
1100 s->avoid_negative_ts = 1;
1102 for (i = 0; i < s->nb_streams; i++)
1103 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1104 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1105 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1106 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1107 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1108 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1109 av_log(s, AV_LOG_ERROR,
1110 "The Matroska muxer does not yet support muxing %s\n",
1111 avcodec_get_name(s->streams[i]->codec->codec_id));
1112 return AVERROR_PATCHWELCOME;
1115 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1117 return AVERROR(ENOMEM);
1119 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1120 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1121 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1122 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1123 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1124 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1125 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 4);
1126 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1127 end_ebml_master(pb, ebml_header);
1129 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1130 mkv->segment_offset = avio_tell(pb);
1132 // we write 2 seek heads - one at the end of the file to point to each
1133 // cluster, and one at the beginning to point to all other level one
1134 // elements (including the seek head at the end of the file), which
1135 // isn't more than 10 elements if we only write one of each other
1136 // currently defined level 1 element
1137 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1138 if (!mkv->main_seekhead)
1139 return AVERROR(ENOMEM);
1141 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1142 if (ret < 0) return ret;
1144 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1145 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1146 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1147 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1148 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1149 uint32_t segment_uid[4];
1152 av_lfg_init(&lfg, av_get_random_seed());
1154 for (i = 0; i < 4; i++)
1155 segment_uid[i] = av_lfg_get(&lfg);
1157 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1158 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1159 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1161 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1162 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1164 const char *ident = "Lavf";
1165 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1166 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1169 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1170 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1171 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1172 uint8_t date_utc_buf[8];
1173 AV_WB64(date_utc_buf, date_utc);
1174 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1177 // reserve space for the duration
1179 mkv->duration_offset = avio_tell(pb);
1180 put_ebml_void(pb, 11); // assumes double-precision float to be written
1181 end_ebml_master(pb, segment_info);
1183 ret = mkv_write_tracks(s);
1184 if (ret < 0) return ret;
1186 for (i = 0; i < s->nb_chapters; i++)
1187 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1189 if (mkv->mode != MODE_WEBM) {
1190 ret = mkv_write_chapters(s);
1191 if (ret < 0) return ret;
1193 ret = mkv_write_tags(s);
1194 if (ret < 0) return ret;
1196 ret = mkv_write_attachments(s);
1197 if (ret < 0) return ret;
1200 if (!s->pb->seekable)
1201 mkv_write_seekhead(pb, mkv->main_seekhead);
1203 mkv->cues = mkv_start_cues(mkv->segment_offset);
1204 if (mkv->cues == NULL)
1205 return AVERROR(ENOMEM);
1207 if (pb->seekable && mkv->reserve_cues_space) {
1208 mkv->cues_pos = avio_tell(pb);
1209 put_ebml_void(pb, mkv->reserve_cues_space);
1212 av_init_packet(&mkv->cur_audio_pkt);
1213 mkv->cur_audio_pkt.size = 0;
1214 mkv->cluster_pos = -1;
1218 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1219 // after 4k and on a keyframe
1221 if (mkv->cluster_time_limit < 0)
1222 mkv->cluster_time_limit = 5000;
1223 if (mkv->cluster_size_limit < 0)
1224 mkv->cluster_size_limit = 5 * 1024 * 1024;
1226 if (mkv->cluster_time_limit < 0)
1227 mkv->cluster_time_limit = 1000;
1228 if (mkv->cluster_size_limit < 0)
1229 mkv->cluster_size_limit = 32 * 1024;
1235 static int mkv_blockgroup_size(int pkt_size)
1237 int size = pkt_size + 4;
1238 size += ebml_num_size(size);
1239 size += 2; // EBML ID for block and block duration
1240 size += 8; // max size of block duration
1241 size += ebml_num_size(size);
1242 size += 1; // blockgroup EBML ID
1246 static int ass_get_duration(const uint8_t *p)
1248 int sh, sm, ss, sc, eh, em, es, ec;
1249 uint64_t start, end;
1251 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1252 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1254 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1255 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1260 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1262 MatroskaMuxContext *mkv = s->priv_data;
1263 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1264 uint8_t *start, *end, *data = pkt->data;
1265 ebml_master blockgroup;
1269 int duration = ass_get_duration(data);
1270 max_duration = FFMAX(duration, max_duration);
1271 end = memchr(data, '\n', data_size);
1272 size = line_size = end ? end-data+1 : data_size;
1273 size -= end ? (end[-1]=='\r')+1 : 0;
1275 for (i=0; i<3; i++, start++)
1276 if (!(start = memchr(start, ',', size-(start-data))))
1277 return max_duration;
1278 size -= start - data;
1279 sscanf(data, "Dialogue: %d,", &layer);
1280 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1281 s->streams[pkt->stream_index]->nb_frames, layer);
1282 size = FFMIN(i+size, sizeof(buffer));
1283 memcpy(buffer+i, start, size-i);
1285 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1286 "pts %" PRId64 ", duration %d\n",
1287 avio_tell(pb), size, pkt->pts, duration);
1288 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1289 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1290 put_ebml_num(pb, size+4, 0);
1291 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1292 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1294 avio_write(pb, buffer, size);
1295 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1296 end_ebml_master(pb, blockgroup);
1299 data_size -= line_size;
1302 return max_duration;
1306 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1313 dst = av_malloc(srclen);
1315 return AVERROR(ENOMEM);
1317 while (srclen >= WV_HEADER_SIZE) {
1320 ret = ff_wv_parse_header(&header, src);
1323 src += WV_HEADER_SIZE;
1324 srclen -= WV_HEADER_SIZE;
1326 if (srclen < header.blocksize) {
1327 ret = AVERROR_INVALIDDATA;
1331 if (header.initial) {
1332 AV_WL32(dst + offset, header.samples);
1335 AV_WL32(dst + offset, header.flags);
1336 AV_WL32(dst + offset + 4, header.crc);
1339 if (!(header.initial && header.final)) {
1340 AV_WL32(dst + offset, header.blocksize);
1344 memcpy(dst + offset, src, header.blocksize);
1345 src += header.blocksize;
1346 srclen -= header.blocksize;
1347 offset += header.blocksize;
1359 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1360 unsigned int blockid, AVPacket *pkt, int flags)
1362 MatroskaMuxContext *mkv = s->priv_data;
1363 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1364 uint8_t *data = NULL, *side_data = NULL;
1365 int offset = 0, size = pkt->size, side_data_size = 0;
1366 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1367 uint64_t additional_id = 0;
1368 int64_t discard_padding = 0;
1369 ebml_master block_group, block_additions, block_more;
1371 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1372 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1373 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1374 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1375 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1376 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1377 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1378 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1379 /* extradata is Annex B, assume the bitstream is too and convert it */
1380 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1381 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1382 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1384 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1390 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1391 /* Matroska specification requires to remove the first QuickTime atom
1397 side_data = av_packet_get_side_data(pkt,
1398 AV_PKT_DATA_SKIP_SAMPLES,
1401 if (side_data && side_data_size >= 10) {
1402 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1403 (AVRational){1, codec->sample_rate},
1404 (AVRational){1, 1000000000});
1407 side_data = av_packet_get_side_data(pkt,
1408 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1411 additional_id = AV_RB64(side_data);
1413 side_data_size -= 8;
1416 if ((side_data_size && additional_id == 1) || discard_padding) {
1417 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1418 blockid = MATROSKA_ID_BLOCK;
1421 put_ebml_id(pb, blockid);
1422 put_ebml_num(pb, size+4, 0);
1423 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1424 avio_wb16(pb, ts - mkv->cluster_pts);
1426 avio_write(pb, data + offset, size);
1427 if (data != pkt->data)
1430 if (discard_padding) {
1431 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1434 if (side_data_size && additional_id == 1) {
1435 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1436 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1437 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1438 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1439 put_ebml_num(pb, side_data_size, 0);
1440 avio_write(pb, side_data, side_data_size);
1441 end_ebml_master(pb, block_more);
1442 end_ebml_master(pb, block_additions);
1444 if ((side_data_size && additional_id == 1) || discard_padding) {
1445 end_ebml_master(pb, block_group);
1449 static int srt_get_duration(uint8_t **buf)
1451 int i, duration = 0;
1453 for (i=0; i<2 && !duration; i++) {
1454 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1455 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1456 &s_hour, &s_min, &s_sec, &s_hsec,
1457 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1458 s_min += 60*s_hour; e_min += 60*e_hour;
1459 s_sec += 60*s_min; e_sec += 60*e_min;
1460 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1461 duration = e_hsec - s_hsec;
1463 *buf += ff_subtitles_next_line(*buf);
1468 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1470 ebml_master blockgroup;
1471 AVPacket pkt2 = *pkt;
1472 int64_t duration = srt_get_duration(&pkt2.data);
1473 pkt2.size -= pkt2.data - pkt->data;
1475 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1476 mkv_blockgroup_size(pkt2.size));
1477 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1478 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1479 end_ebml_master(pb, blockgroup);
1484 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1486 MatroskaMuxContext *mkv = s->priv_data;
1487 ebml_master blockgroup;
1488 int id_size, settings_size, size;
1489 uint8_t *id, *settings;
1490 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1491 const int flags = 0;
1494 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1498 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1501 size = id_size + 1 + settings_size + 1 + pkt->size;
1503 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1504 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1505 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1507 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1509 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1510 put_ebml_num(pb, size+4, 0);
1511 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1512 avio_wb16(pb, ts - mkv->cluster_pts);
1514 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1516 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1517 end_ebml_master(pb, blockgroup);
1519 return pkt->duration;
1522 static void mkv_flush_dynbuf(AVFormatContext *s)
1524 MatroskaMuxContext *mkv = s->priv_data;
1531 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1532 avio_write(s->pb, dyn_buf, bufsize);
1537 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1539 MatroskaMuxContext *mkv = s->priv_data;
1540 AVIOContext *pb = s->pb;
1541 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1542 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1543 int duration = pkt->duration;
1545 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1546 int64_t relative_packet_pos;
1548 if (ts == AV_NOPTS_VALUE) {
1549 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1550 return AVERROR(EINVAL);
1553 if (!s->pb->seekable) {
1555 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1556 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1563 if (mkv->cluster_pos == -1) {
1564 mkv->cluster_pos = avio_tell(s->pb);
1565 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1566 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1567 mkv->cluster_pts = FFMAX(0, ts);
1570 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1572 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1573 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1575 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1576 duration = mkv_write_ass_blocks(s, pb, pkt);
1578 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1579 duration = mkv_write_srt_blocks(s, pb, pkt);
1580 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1581 duration = mkv_write_vtt_blocks(s, pb, pkt);
1583 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1584 /* For backward compatibility, prefer convergence_duration. */
1585 if (pkt->convergence_duration > 0) {
1586 duration = pkt->convergence_duration;
1588 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1589 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1590 end_ebml_master(pb, blockgroup);
1593 if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) || codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1594 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos,
1595 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);
1596 if (ret < 0) return ret;
1599 mkv->duration = FFMAX(mkv->duration, ts + duration);
1603 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1605 MatroskaMuxContext *mkv = s->priv_data;
1606 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1607 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1609 int64_t cluster_time;
1613 if (mkv->tracks[pkt->stream_index].write_dts)
1614 cluster_time = pkt->dts - mkv->cluster_pts;
1616 cluster_time = pkt->pts - mkv->cluster_pts;
1618 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1619 // after 4k and on a keyframe
1620 if (s->pb->seekable) {
1622 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1625 cluster_size = avio_tell(pb);
1628 if (mkv->cluster_pos != -1 &&
1629 (cluster_size > mkv->cluster_size_limit ||
1630 cluster_time > mkv->cluster_time_limit ||
1631 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1632 cluster_size > 4 * 1024))) {
1633 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1634 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1635 avio_tell(pb), pkt->pts, pkt->dts);
1636 end_ebml_master(pb, mkv->cluster);
1637 mkv->cluster_pos = -1;
1639 mkv_flush_dynbuf(s);
1643 // check if we have an audio packet cached
1644 if (mkv->cur_audio_pkt.size > 0) {
1645 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1646 av_free_packet(&mkv->cur_audio_pkt);
1648 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1653 // buffer an audio packet to ensure the packet containing the video
1654 // keyframe's timecode is contained in the same cluster for WebM
1655 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1656 mkv->cur_audio_pkt = *pkt;
1658 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1659 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1661 ret = av_dup_packet(&mkv->cur_audio_pkt);
1662 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1663 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1666 ret = mkv_write_packet_internal(s, pkt);
1670 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1672 MatroskaMuxContext *mkv = s->priv_data;
1674 if (s->pb->seekable)
1679 if (mkv->cluster_pos != -1) {
1680 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1681 " bytes\n", avio_tell(pb));
1682 end_ebml_master(pb, mkv->cluster);
1683 mkv->cluster_pos = -1;
1685 mkv_flush_dynbuf(s);
1690 return mkv_write_packet(s, pkt);
1693 static int mkv_write_trailer(AVFormatContext *s)
1695 MatroskaMuxContext *mkv = s->priv_data;
1696 AVIOContext *pb = s->pb;
1697 int64_t currentpos, cuespos;
1700 // check if we have an audio packet cached
1701 if (mkv->cur_audio_pkt.size > 0) {
1702 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1703 av_free_packet(&mkv->cur_audio_pkt);
1705 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1711 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1712 mkv_flush_dynbuf(s);
1713 } else if (mkv->cluster_pos != -1) {
1714 end_ebml_master(pb, mkv->cluster);
1717 if (mkv->mode != MODE_WEBM) {
1718 ret = mkv_write_chapters(s);
1719 if (ret < 0) return ret;
1723 if (mkv->cues->num_entries) {
1724 if (mkv->reserve_cues_space) {
1727 currentpos = avio_tell(pb);
1728 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1730 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1731 cues_end = avio_tell(pb);
1732 if (cues_end > cuespos + mkv->reserve_cues_space) {
1733 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1734 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1735 cues_end - cuespos);
1736 return AVERROR(EINVAL);
1739 if (cues_end < cuespos + mkv->reserve_cues_space)
1740 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1742 avio_seek(pb, currentpos, SEEK_SET);
1744 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1747 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1748 if (ret < 0) return ret;
1751 mkv_write_seekhead(pb, mkv->main_seekhead);
1753 // update the duration
1754 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1755 currentpos = avio_tell(pb);
1756 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1757 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1759 avio_seek(pb, currentpos, SEEK_SET);
1762 end_ebml_master(pb, mkv->segment);
1763 av_freep(&mkv->tracks);
1764 av_freep(&mkv->cues->entries);
1765 av_freep(&mkv->cues);
1770 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1773 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1774 if (ff_mkv_codec_tags[i].id == codec_id)
1777 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1778 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1779 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1786 static const AVCodecTag additional_audio_tags[] = {
1787 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1788 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1789 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1790 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1791 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1792 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1793 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1794 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1795 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1796 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1797 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1798 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1799 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1802 static const AVCodecTag additional_video_tags[] = {
1803 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1804 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1805 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1806 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1807 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1808 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1811 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1812 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1813 static const AVOption options[] = {
1814 { "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 },
1815 { "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 },
1816 { "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 },
1820 #if CONFIG_MATROSKA_MUXER
1821 static const AVClass matroska_class = {
1822 .class_name = "matroska muxer",
1823 .item_name = av_default_item_name,
1825 .version = LIBAVUTIL_VERSION_INT,
1828 AVOutputFormat ff_matroska_muxer = {
1830 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1831 .mime_type = "video/x-matroska",
1832 .extensions = "mkv",
1833 .priv_data_size = sizeof(MatroskaMuxContext),
1834 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1835 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1836 .video_codec = CONFIG_LIBX264_ENCODER ?
1837 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1838 .write_header = mkv_write_header,
1839 .write_packet = mkv_write_flush_packet,
1840 .write_trailer = mkv_write_trailer,
1841 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1842 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1843 .codec_tag = (const AVCodecTag* const []){
1844 ff_codec_bmp_tags, ff_codec_wav_tags,
1845 additional_audio_tags, additional_video_tags, 0
1848 .subtitle_codec = AV_CODEC_ID_SSA,
1850 .subtitle_codec = AV_CODEC_ID_ASS,
1852 .query_codec = mkv_query_codec,
1853 .priv_class = &matroska_class,
1857 #if CONFIG_WEBM_MUXER
1858 static const AVClass webm_class = {
1859 .class_name = "webm muxer",
1860 .item_name = av_default_item_name,
1862 .version = LIBAVUTIL_VERSION_INT,
1865 AVOutputFormat ff_webm_muxer = {
1867 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1868 .mime_type = "video/webm",
1869 .extensions = "webm",
1870 .priv_data_size = sizeof(MatroskaMuxContext),
1871 .audio_codec = AV_CODEC_ID_VORBIS,
1872 .video_codec = AV_CODEC_ID_VP8,
1873 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1874 .write_header = mkv_write_header,
1875 .write_packet = mkv_write_flush_packet,
1876 .write_trailer = mkv_write_trailer,
1877 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1878 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1879 .priv_class = &webm_class,
1883 #if CONFIG_MATROSKA_AUDIO_MUXER
1884 static const AVClass mka_class = {
1885 .class_name = "matroska audio muxer",
1886 .item_name = av_default_item_name,
1888 .version = LIBAVUTIL_VERSION_INT,
1890 AVOutputFormat ff_matroska_audio_muxer = {
1892 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1893 .mime_type = "audio/x-matroska",
1894 .extensions = "mka",
1895 .priv_data_size = sizeof(MatroskaMuxContext),
1896 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1897 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1898 .video_codec = AV_CODEC_ID_NONE,
1899 .write_header = mkv_write_header,
1900 .write_packet = mkv_write_flush_packet,
1901 .write_trailer = mkv_write_trailer,
1902 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1904 .codec_tag = (const AVCodecTag* const []){
1905 ff_codec_wav_tags, additional_audio_tags, 0
1907 .priv_class = &mka_class,