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
26 #include "avio_internal.h"
27 #include "avlanguage.h"
33 #include "subtitles.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/intfloat.h"
39 #include "libavutil/intreadwrite.h"
40 #include "libavutil/lfg.h"
41 #include "libavutil/mathematics.h"
42 #include "libavutil/opt.h"
43 #include "libavutil/random_seed.h"
44 #include "libavutil/samplefmt.h"
45 #include "libavutil/sha.h"
47 #include "libavcodec/xiph.h"
48 #include "libavcodec/mpeg4audio.h"
49 #include "libavcodec/internal.h"
51 typedef struct ebml_master {
52 int64_t pos; ///< absolute offset in the file where the master's elements start
53 int sizebytes; ///< how many bytes were reserved for the size
56 typedef struct mkv_seekhead_entry {
57 unsigned int elementid;
61 typedef struct mkv_seekhead {
63 int64_t segment_offset; ///< the file offset to the beginning of the segment
64 int reserved_size; ///< -1 if appending to file
66 mkv_seekhead_entry *entries;
73 int64_t cluster_pos; ///< file offset of the cluster containing the block
74 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
75 int64_t duration; ///< duration of the block according to time base
79 int64_t segment_offset;
80 mkv_cuepoint *entries;
89 #define MODE_MATROSKAv2 0x01
90 #define MODE_WEBM 0x02
92 typedef struct MatroskaMuxContext {
97 int64_t segment_offset;
99 int64_t cluster_pos; ///< file offset of the current cluster
101 int64_t duration_offset;
103 mkv_seekhead *main_seekhead;
107 AVPacket cur_audio_pkt;
109 int have_attachments;
111 int reserve_cues_space;
112 int cluster_size_limit;
114 int64_t cluster_time_limit;
116 uint32_t chapter_id_offset;
118 } MatroskaMuxContext;
121 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
122 * offset, 4 bytes for target EBML ID */
123 #define MAX_SEEKENTRY_SIZE 21
125 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
127 #define MAX_CUETRACKPOS_SIZE 42
129 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
130 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
132 /** Seek preroll value for opus */
133 #define OPUS_SEEK_PREROLL 80000000
136 static int ebml_id_size(unsigned int id)
138 return (av_log2(id+1)-1)/7+1;
141 static void put_ebml_id(AVIOContext *pb, unsigned int id)
143 int i = ebml_id_size(id);
145 avio_w8(pb, (uint8_t)(id >> (i*8)));
149 * Write an EBML size meaning "unknown size".
151 * @param bytes The number of bytes the size should occupy (maximum: 8).
153 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
155 av_assert0(bytes <= 8);
156 avio_w8(pb, 0x1ff >> bytes);
157 ffio_fill(pb, 0xff, bytes - 1);
161 * Calculate how many bytes are needed to represent a given number in EBML.
163 static int ebml_num_size(uint64_t num)
166 while ((num+1) >> bytes*7) bytes++;
171 * Write a number in EBML variable length format.
173 * @param bytes The number of bytes that need to be used to write the number.
174 * If zero, any number of bytes can be used.
176 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
178 int i, needed_bytes = ebml_num_size(num);
180 // sizes larger than this are currently undefined in EBML
181 av_assert0(num < (1ULL<<56)-1);
184 // don't care how many bytes are used, so use the min
185 bytes = needed_bytes;
186 // the bytes needed to write the given size would exceed the bytes
187 // that we need to use, so write unknown size. This shouldn't happen.
188 av_assert0(bytes >= needed_bytes);
190 num |= 1ULL << bytes*7;
191 for (i = bytes - 1; i >= 0; i--)
192 avio_w8(pb, (uint8_t)(num >> i*8));
195 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
199 while (tmp>>=8) bytes++;
201 put_ebml_id(pb, elementid);
202 put_ebml_num(pb, bytes, 0);
203 for (i = bytes - 1; i >= 0; i--)
204 avio_w8(pb, (uint8_t)(val >> i*8));
207 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
210 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
212 while (tmp>>=8) bytes++;
214 put_ebml_id(pb, elementid);
215 put_ebml_num(pb, bytes, 0);
216 for (i = bytes - 1; i >= 0; i--)
217 avio_w8(pb, (uint8_t)(val >> i*8));
220 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
222 put_ebml_id(pb, elementid);
223 put_ebml_num(pb, 8, 0);
224 avio_wb64(pb, av_double2int(val));
227 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
228 const void *buf, int size)
230 put_ebml_id(pb, elementid);
231 put_ebml_num(pb, size, 0);
232 avio_write(pb, buf, size);
235 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
237 put_ebml_binary(pb, elementid, str, strlen(str));
241 * Write a void element of a given size. Useful for reserving space in
242 * the file to be written to later.
244 * @param size The number of bytes to reserve, which must be at least 2.
246 static void put_ebml_void(AVIOContext *pb, uint64_t size)
248 int64_t currentpos = avio_tell(pb);
250 av_assert0(size >= 2);
252 put_ebml_id(pb, EBML_ID_VOID);
253 // we need to subtract the length needed to store the size from the
254 // size we need to reserve so 2 cases, we use 8 bytes to store the
255 // size if possible, 1 byte otherwise
257 put_ebml_num(pb, size-1, 0);
259 put_ebml_num(pb, size-9, 8);
260 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
263 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
265 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
266 put_ebml_id(pb, elementid);
267 put_ebml_size_unknown(pb, bytes);
268 return (ebml_master){ avio_tell(pb), bytes };
271 static void end_ebml_master(AVIOContext *pb, ebml_master master)
273 int64_t pos = avio_tell(pb);
275 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
277 put_ebml_num(pb, pos - master.pos, master.sizebytes);
278 avio_seek(pb, pos, SEEK_SET);
281 static void put_xiph_size(AVIOContext *pb, int size)
283 ffio_fill(pb, 255, size / 255);
284 avio_w8(pb, size % 255);
288 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
289 * elements. If a maximum number of elements is specified, enough space
290 * will be reserved at the current file location to write a seek head of
293 * @param segment_offset The absolute offset to the position in the file
294 * where the segment begins.
295 * @param numelements The maximum number of elements that will be indexed
296 * by this seek head, 0 if unlimited.
298 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
300 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
301 if (new_seekhead == NULL)
304 new_seekhead->segment_offset = segment_offset;
306 if (numelements > 0) {
307 new_seekhead->filepos = avio_tell(pb);
308 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
309 // and size, and 3 bytes to guarantee that an EBML void element
310 // will fit afterwards
311 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
312 new_seekhead->max_entries = numelements;
313 put_ebml_void(pb, new_seekhead->reserved_size);
318 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
320 mkv_seekhead_entry *entries = seekhead->entries;
322 // don't store more elements than we reserved space for
323 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
326 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
328 return AVERROR(ENOMEM);
329 seekhead->entries = entries;
331 seekhead->entries[seekhead->num_entries].elementid = elementid;
332 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
338 * Write the seek head to the file and free it. If a maximum number of
339 * elements was specified to mkv_start_seekhead(), the seek head will
340 * be written at the location reserved for it. Otherwise, it is written
341 * at the current location in the file.
343 * @return The file offset where the seekhead was written,
344 * -1 if an error occurred.
346 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
348 ebml_master metaseek, seekentry;
352 currentpos = avio_tell(pb);
354 if (seekhead->reserved_size > 0) {
355 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
361 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
362 for (i = 0; i < seekhead->num_entries; i++) {
363 mkv_seekhead_entry *entry = &seekhead->entries[i];
365 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
367 put_ebml_id(pb, MATROSKA_ID_SEEKID);
368 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
369 put_ebml_id(pb, entry->elementid);
371 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
372 end_ebml_master(pb, seekentry);
374 end_ebml_master(pb, metaseek);
376 if (seekhead->reserved_size > 0) {
377 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
378 put_ebml_void(pb, remaining);
379 avio_seek(pb, currentpos, SEEK_SET);
381 currentpos = seekhead->filepos;
384 av_freep(&seekhead->entries);
390 static mkv_cues * mkv_start_cues(int64_t segment_offset)
392 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
396 cues->segment_offset = segment_offset;
400 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos,
403 mkv_cuepoint *entries = cues->entries;
408 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
410 return AVERROR(ENOMEM);
411 cues->entries = entries;
413 cues->entries[cues->num_entries].pts = ts;
414 cues->entries[cues->num_entries].tracknum = stream + 1;
415 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
416 cues->entries[cues->num_entries].relative_pos = relative_pos;
417 cues->entries[cues->num_entries++].duration = duration;
422 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
424 ebml_master cues_element;
428 currentpos = avio_tell(pb);
429 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
431 for (i = 0; i < cues->num_entries; i++) {
432 ebml_master cuepoint, track_positions;
433 mkv_cuepoint *entry = &cues->entries[i];
434 uint64_t pts = entry->pts;
436 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
437 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
439 // put all the entries from different tracks that have the exact same
440 // timestamp into the same CuePoint
441 for (j = 0; j < num_tracks; j++)
442 tracks[j].has_cue = 0;
443 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
444 int tracknum = entry[j].tracknum - 1;
445 av_assert0(tracknum>=0 && tracknum<num_tracks);
446 if (tracks[tracknum].has_cue)
448 tracks[tracknum].has_cue = 1;
449 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
450 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
451 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
452 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
453 if (entry[j].duration != -1)
454 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
455 end_ebml_master(pb, track_positions);
458 end_ebml_master(pb, cuepoint);
460 end_ebml_master(pb, cues_element);
465 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
467 uint8_t *header_start[3];
469 int first_header_size;
472 if (codec->codec_id == AV_CODEC_ID_VORBIS)
473 first_header_size = 30;
475 first_header_size = 42;
477 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
478 first_header_size, header_start, header_len) < 0) {
479 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
483 avio_w8(pb, 2); // number packets - 1
484 for (j = 0; j < 2; j++) {
485 put_xiph_size(pb, header_len[j]);
487 for (j = 0; j < 3; j++)
488 avio_write(pb, header_start[j], header_len[j]);
493 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
495 if (codec->extradata && codec->extradata_size == 2)
496 avio_write(pb, codec->extradata, 2);
498 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
502 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
504 MPEG4AudioConfig mp4ac;
506 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
507 codec->extradata_size * 8, 1) < 0) {
508 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
512 *sample_rate = mp4ac.sample_rate;
513 *output_sample_rate = mp4ac.ext_sample_rate;
516 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
520 int ret, codecpriv_size;
522 ret = avio_open_dyn_buf(&dyn_cp);
527 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
528 ret = put_xiph_codecpriv(s, dyn_cp, codec);
529 else if (codec->codec_id == AV_CODEC_ID_FLAC)
530 ret = ff_flac_write_header(dyn_cp, codec, 1);
531 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
532 ret = put_wv_codecpriv(dyn_cp, codec);
533 else if (codec->codec_id == AV_CODEC_ID_H264)
534 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
535 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
536 if (codec->extradata_size < 36) {
537 av_log(s, AV_LOG_ERROR,
538 "Invalid extradata found, ALAC expects a 36-byte "
540 ret = AVERROR_INVALIDDATA;
542 avio_write(dyn_cp, codec->extradata + 12,
543 codec->extradata_size - 12);
545 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
546 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
547 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
549 if (!codec->codec_tag)
550 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
551 if (codec->extradata_size) {
552 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
553 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata+4)) != codec->codec_id
556 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
557 avio_wl32(dyn_cp, codec->codec_tag);
558 for(i=0; i<0x5a-8; i++)
561 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
564 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
565 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
566 avcodec_get_name(codec->codec_id));
568 if (!codec->codec_tag)
569 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
570 if (!codec->codec_tag) {
571 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
572 avcodec_get_name(codec->codec_id));
573 ret = AVERROR(EINVAL);
576 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
579 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
581 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
583 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
584 avcodec_get_name(codec->codec_id));
585 ret = AVERROR(EINVAL);
587 if (!codec->codec_tag)
588 codec->codec_tag = tag;
590 ff_put_wav_header(dyn_cp, codec);
593 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
595 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
600 static int mkv_write_tracks(AVFormatContext *s)
602 MatroskaMuxContext *mkv = s->priv_data;
603 AVIOContext *pb = s->pb;
605 int i, j, ret, default_stream_exists = 0;
607 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
608 if (ret < 0) return ret;
610 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
611 for (i = 0; i < s->nb_streams; i++) {
612 AVStream *st = s->streams[i];
613 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
615 for (i = 0; i < s->nb_streams; i++) {
616 AVStream *st = s->streams[i];
617 AVCodecContext *codec = st->codec;
618 ebml_master subinfo, track;
621 int bit_depth = av_get_bits_per_sample(codec->codec_id);
622 int sample_rate = codec->sample_rate;
623 int output_sample_rate = 0;
624 int display_width_div = 1;
625 int display_height_div = 1;
626 AVDictionaryEntry *tag;
628 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
629 mkv->have_attachments = 1;
633 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
634 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
636 bit_depth = codec->bits_per_coded_sample;
638 if (codec->codec_id == AV_CODEC_ID_AAC)
639 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
641 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
642 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
643 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
644 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
646 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
647 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
648 tag = av_dict_get(st->metadata, "language", NULL, 0);
649 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
650 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
651 } else if (tag && tag->value) {
652 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
655 // The default value for TRACKFLAGDEFAULT is 1, so add element
656 // if we need to clear it.
657 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
658 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
660 if (st->disposition & AV_DISPOSITION_FORCED)
661 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
663 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
664 const char *codec_id;
665 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
666 codec_id = "D_WEBVTT/CAPTIONS";
667 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
668 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
669 codec_id = "D_WEBVTT/DESCRIPTIONS";
670 native_id = MATROSKA_TRACK_TYPE_METADATA;
671 } else if (st->disposition & AV_DISPOSITION_METADATA) {
672 codec_id = "D_WEBVTT/METADATA";
673 native_id = MATROSKA_TRACK_TYPE_METADATA;
675 codec_id = "D_WEBVTT/SUBTITLES";
676 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
678 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
680 // look for a codec ID string specific to mkv to use,
681 // if none are found, use AVI codes
682 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
683 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
684 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
691 if (codec->codec_id == AV_CODEC_ID_OPUS) {
692 uint64_t codec_delay =av_rescale_q(codec->delay,
693 (AVRational){1, codec->sample_rate},
694 (AVRational){1, 1000000000});
695 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codec_delay);
696 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
700 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
701 codec->codec_id == AV_CODEC_ID_VP9 ||
702 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
703 codec->codec_id == AV_CODEC_ID_VORBIS ||
704 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
705 av_log(s, AV_LOG_ERROR,
706 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
707 return AVERROR(EINVAL);
710 switch (codec->codec_type) {
711 case AVMEDIA_TYPE_VIDEO:
712 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
713 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
714 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
716 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
719 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
720 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
721 || codec->codec_id == AV_CODEC_ID_SVQ1
722 || codec->codec_id == AV_CODEC_ID_SVQ3
723 || codec->codec_id == AV_CODEC_ID_CINEPAK))
727 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
728 else if (!native_id) {
729 // if there is no mkv-specific codec ID, use VFW mode
730 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
731 mkv->tracks[i].write_dts = 1;
734 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
735 // XXX: interlace flag?
736 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
737 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
739 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
740 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
741 // save stereo mode flag
742 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
744 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
745 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
750 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
751 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
752 av_log(s, AV_LOG_ERROR,
753 "The specified stereo mode is not valid.\n");
754 return AVERROR(EINVAL);
756 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
763 display_width_div = 2;
769 display_height_div = 2;
774 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
775 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
776 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
777 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
780 if (st->sample_aspect_ratio.num) {
781 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
782 if (d_width > INT_MAX) {
783 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
784 return AVERROR(EINVAL);
786 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
787 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
788 } else if (display_width_div != 1 || display_height_div != 1) {
789 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
790 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
793 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
794 uint32_t color_space = av_le2ne32(codec->codec_tag);
795 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
797 end_ebml_master(pb, subinfo);
800 case AVMEDIA_TYPE_AUDIO:
801 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
804 // no mkv-specific ID, use ACM mode
805 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
807 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
808 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
809 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
810 if (output_sample_rate)
811 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
813 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
814 end_ebml_master(pb, subinfo);
817 case AVMEDIA_TYPE_SUBTITLE:
819 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
820 return AVERROR(ENOSYS);
823 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
824 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
826 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
829 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
830 return AVERROR(EINVAL);
833 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
834 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
835 if (ret < 0) return ret;
838 end_ebml_master(pb, track);
840 // ms precision is the de-facto standard timescale for mkv files
841 avpriv_set_pts_info(st, 64, 1, 1000);
843 end_ebml_master(pb, tracks);
847 static int mkv_write_chapters(AVFormatContext *s)
849 MatroskaMuxContext *mkv = s->priv_data;
850 AVIOContext *pb = s->pb;
851 ebml_master chapters, editionentry;
852 AVRational scale = {1, 1E9};
855 if (!s->nb_chapters || mkv->wrote_chapters)
858 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
859 if (ret < 0) return ret;
861 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
862 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
863 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
864 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
865 for (i = 0; i < s->nb_chapters; i++) {
866 ebml_master chapteratom, chapterdisplay;
867 AVChapter *c = s->chapters[i];
868 AVDictionaryEntry *t = NULL;
870 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
871 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
872 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
873 av_rescale_q(c->start, c->time_base, scale));
874 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
875 av_rescale_q(c->end, c->time_base, scale));
876 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
877 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
878 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
879 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
880 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
881 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
882 end_ebml_master(pb, chapterdisplay);
884 end_ebml_master(pb, chapteratom);
886 end_ebml_master(pb, editionentry);
887 end_ebml_master(pb, chapters);
889 mkv->wrote_chapters = 1;
893 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
895 uint8_t *key = av_strdup(t->key);
897 const uint8_t *lang = NULL;
900 if ((p = strrchr(p, '-')) &&
901 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
908 else if (*p >= 'a' && *p <= 'z')
913 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
914 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
916 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
917 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
918 end_ebml_master(pb, tag);
923 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
924 unsigned int uid, ebml_master *tags)
926 MatroskaMuxContext *mkv = s->priv_data;
927 ebml_master tag, targets;
928 AVDictionaryEntry *t = NULL;
932 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
933 if (ret < 0) return ret;
935 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
938 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
939 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
941 put_ebml_uint(s->pb, elementid, uid);
942 end_ebml_master(s->pb, targets);
944 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
945 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
946 mkv_write_simpletag(s->pb, t);
948 end_ebml_master(s->pb, tag);
952 static int mkv_check_tag(AVDictionary *m)
954 AVDictionaryEntry *t = NULL;
956 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
957 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
963 static int mkv_write_tags(AVFormatContext *s)
965 MatroskaMuxContext *mkv = s->priv_data;
966 ebml_master tags = {0};
969 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
971 if (mkv_check_tag(s->metadata)) {
972 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
973 if (ret < 0) return ret;
976 for (i = 0; i < s->nb_streams; i++) {
977 AVStream *st = s->streams[i];
979 if (!mkv_check_tag(st->metadata))
982 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
983 if (ret < 0) return ret;
986 for (i = 0; i < s->nb_chapters; i++) {
987 AVChapter *ch = s->chapters[i];
989 if (!mkv_check_tag(ch->metadata))
992 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
993 if (ret < 0) return ret;
997 end_ebml_master(s->pb, tags);
1001 static int mkv_write_attachments(AVFormatContext *s)
1003 MatroskaMuxContext *mkv = s->priv_data;
1004 AVIOContext *pb = s->pb;
1005 ebml_master attachments;
1009 if (!mkv->have_attachments)
1012 av_lfg_init(&c, av_get_random_seed());
1014 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1015 if (ret < 0) return ret;
1017 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1019 for (i = 0; i < s->nb_streams; i++) {
1020 AVStream *st = s->streams[i];
1021 ebml_master attached_file;
1022 AVDictionaryEntry *t;
1023 const char *mimetype = NULL;
1026 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1029 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1031 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1032 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1033 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1034 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1035 return AVERROR(EINVAL);
1037 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1038 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1039 mimetype = t->value;
1040 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1042 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1043 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1044 mimetype = ff_mkv_mime_tags[i].str;
1049 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1050 "it cannot be deduced from the codec id.\n", i);
1051 return AVERROR(EINVAL);
1054 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
1055 struct AVSHA *sha = av_sha_alloc();
1058 return AVERROR(ENOMEM);
1059 av_sha_init(sha, 160);
1060 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1061 av_sha_final(sha, digest);
1063 fileuid = AV_RL64(digest);
1065 fileuid = av_lfg_get(&c);
1067 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1070 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1071 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1072 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1073 end_ebml_master(pb, attached_file);
1075 end_ebml_master(pb, attachments);
1080 static int mkv_write_header(AVFormatContext *s)
1082 MatroskaMuxContext *mkv = s->priv_data;
1083 AVIOContext *pb = s->pb;
1084 ebml_master ebml_header, segment_info;
1085 AVDictionaryEntry *tag;
1088 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1089 else mkv->mode = MODE_MATROSKAv2;
1091 if (s->avoid_negative_ts < 0)
1092 s->avoid_negative_ts = 1;
1094 for (i = 0; i < s->nb_streams; i++)
1095 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1096 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1097 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1098 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1099 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1100 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1101 av_log(s, AV_LOG_ERROR,
1102 "The Matroska muxer does not yet support muxing %s\n",
1103 avcodec_get_name(s->streams[i]->codec->codec_id));
1104 return AVERROR_PATCHWELCOME;
1107 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1109 return AVERROR(ENOMEM);
1111 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1112 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1113 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1114 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1115 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1116 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1117 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 4);
1118 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1119 end_ebml_master(pb, ebml_header);
1121 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1122 mkv->segment_offset = avio_tell(pb);
1124 // we write 2 seek heads - one at the end of the file to point to each
1125 // cluster, and one at the beginning to point to all other level one
1126 // elements (including the seek head at the end of the file), which
1127 // isn't more than 10 elements if we only write one of each other
1128 // currently defined level 1 element
1129 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1130 if (!mkv->main_seekhead)
1131 return AVERROR(ENOMEM);
1133 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1134 if (ret < 0) return ret;
1136 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1137 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1138 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1139 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1140 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1141 uint32_t segment_uid[4];
1144 av_lfg_init(&lfg, av_get_random_seed());
1146 for (i = 0; i < 4; i++)
1147 segment_uid[i] = av_lfg_get(&lfg);
1149 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1150 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1151 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1153 const char *ident = "Lavf";
1154 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1155 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1158 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1159 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1160 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1161 uint8_t date_utc_buf[8];
1162 AV_WB64(date_utc_buf, date_utc);
1163 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1166 // reserve space for the duration
1168 mkv->duration_offset = avio_tell(pb);
1169 put_ebml_void(pb, 11); // assumes double-precision float to be written
1170 end_ebml_master(pb, segment_info);
1172 ret = mkv_write_tracks(s);
1173 if (ret < 0) return ret;
1175 for (i = 0; i < s->nb_chapters; i++)
1176 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1178 if (mkv->mode != MODE_WEBM) {
1179 ret = mkv_write_chapters(s);
1180 if (ret < 0) return ret;
1182 ret = mkv_write_tags(s);
1183 if (ret < 0) return ret;
1185 ret = mkv_write_attachments(s);
1186 if (ret < 0) return ret;
1189 if (!s->pb->seekable)
1190 mkv_write_seekhead(pb, mkv->main_seekhead);
1192 mkv->cues = mkv_start_cues(mkv->segment_offset);
1193 if (mkv->cues == NULL)
1194 return AVERROR(ENOMEM);
1196 if (pb->seekable && mkv->reserve_cues_space) {
1197 mkv->cues_pos = avio_tell(pb);
1198 put_ebml_void(pb, mkv->reserve_cues_space);
1201 av_init_packet(&mkv->cur_audio_pkt);
1202 mkv->cur_audio_pkt.size = 0;
1203 mkv->cluster_pos = -1;
1207 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1208 // after 4k and on a keyframe
1210 if (mkv->cluster_time_limit < 0)
1211 mkv->cluster_time_limit = 5000;
1212 if (mkv->cluster_size_limit < 0)
1213 mkv->cluster_size_limit = 5 * 1024 * 1024;
1215 if (mkv->cluster_time_limit < 0)
1216 mkv->cluster_time_limit = 1000;
1217 if (mkv->cluster_size_limit < 0)
1218 mkv->cluster_size_limit = 32 * 1024;
1224 static int mkv_blockgroup_size(int pkt_size)
1226 int size = pkt_size + 4;
1227 size += ebml_num_size(size);
1228 size += 2; // EBML ID for block and block duration
1229 size += 8; // max size of block duration
1230 size += ebml_num_size(size);
1231 size += 1; // blockgroup EBML ID
1235 static int ass_get_duration(const uint8_t *p)
1237 int sh, sm, ss, sc, eh, em, es, ec;
1238 uint64_t start, end;
1240 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1241 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1243 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1244 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1249 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1251 MatroskaMuxContext *mkv = s->priv_data;
1252 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1253 uint8_t *start, *end, *data = pkt->data;
1254 ebml_master blockgroup;
1258 int duration = ass_get_duration(data);
1259 max_duration = FFMAX(duration, max_duration);
1260 end = memchr(data, '\n', data_size);
1261 size = line_size = end ? end-data+1 : data_size;
1262 size -= end ? (end[-1]=='\r')+1 : 0;
1264 for (i=0; i<3; i++, start++)
1265 if (!(start = memchr(start, ',', size-(start-data))))
1266 return max_duration;
1267 size -= start - data;
1268 sscanf(data, "Dialogue: %d,", &layer);
1269 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1270 s->streams[pkt->stream_index]->nb_frames, layer);
1271 size = FFMIN(i+size, sizeof(buffer));
1272 memcpy(buffer+i, start, size-i);
1274 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1275 "pts %" PRId64 ", duration %d\n",
1276 avio_tell(pb), size, pkt->pts, duration);
1277 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1278 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1279 put_ebml_num(pb, size+4, 0);
1280 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1281 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1283 avio_write(pb, buffer, size);
1284 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1285 end_ebml_master(pb, blockgroup);
1288 data_size -= line_size;
1291 return max_duration;
1295 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1302 dst = av_malloc(srclen);
1304 return AVERROR(ENOMEM);
1306 while (srclen >= WV_HEADER_SIZE) {
1309 ret = ff_wv_parse_header(&header, src);
1312 src += WV_HEADER_SIZE;
1313 srclen -= WV_HEADER_SIZE;
1315 if (srclen < header.blocksize) {
1316 ret = AVERROR_INVALIDDATA;
1320 if (header.initial) {
1321 AV_WL32(dst + offset, header.samples);
1324 AV_WL32(dst + offset, header.flags);
1325 AV_WL32(dst + offset + 4, header.crc);
1328 if (!(header.initial && header.final)) {
1329 AV_WL32(dst + offset, header.blocksize);
1333 memcpy(dst + offset, src, header.blocksize);
1334 src += header.blocksize;
1335 srclen -= header.blocksize;
1336 offset += header.blocksize;
1348 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1349 unsigned int blockid, AVPacket *pkt, int flags)
1351 MatroskaMuxContext *mkv = s->priv_data;
1352 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1353 uint8_t *data = NULL, *side_data = NULL;
1354 int offset = 0, size = pkt->size, side_data_size = 0;
1355 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1356 uint64_t additional_id = 0;
1357 int64_t discard_padding = 0;
1358 ebml_master block_group, block_additions, block_more;
1360 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1361 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1362 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1363 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1364 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1365 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1366 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1367 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1369 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1375 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1376 /* Matroska specification requires to remove the first QuickTime atom
1382 side_data = av_packet_get_side_data(pkt,
1383 AV_PKT_DATA_SKIP_SAMPLES,
1386 if (side_data && side_data_size >= 10) {
1387 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1388 (AVRational){1, codec->sample_rate},
1389 (AVRational){1, 1000000000});
1392 side_data = av_packet_get_side_data(pkt,
1393 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1396 additional_id = AV_RB64(side_data);
1398 side_data_size -= 8;
1401 if ((side_data_size && additional_id == 1) || discard_padding) {
1402 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1403 blockid = MATROSKA_ID_BLOCK;
1406 put_ebml_id(pb, blockid);
1407 put_ebml_num(pb, size+4, 0);
1408 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1409 avio_wb16(pb, ts - mkv->cluster_pts);
1411 avio_write(pb, data + offset, size);
1412 if (data != pkt->data)
1415 if (discard_padding) {
1416 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1419 if (side_data_size && additional_id == 1) {
1420 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1421 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1422 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1423 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1424 put_ebml_num(pb, side_data_size, 0);
1425 avio_write(pb, side_data, side_data_size);
1426 end_ebml_master(pb, block_more);
1427 end_ebml_master(pb, block_additions);
1429 if ((side_data_size && additional_id == 1) || discard_padding) {
1430 end_ebml_master(pb, block_group);
1434 static int srt_get_duration(uint8_t **buf)
1436 int i, duration = 0;
1438 for (i=0; i<2 && !duration; i++) {
1439 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1440 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1441 &s_hour, &s_min, &s_sec, &s_hsec,
1442 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1443 s_min += 60*s_hour; e_min += 60*e_hour;
1444 s_sec += 60*s_min; e_sec += 60*e_min;
1445 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1446 duration = e_hsec - s_hsec;
1448 *buf += ff_subtitles_next_line(*buf);
1453 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1455 ebml_master blockgroup;
1456 AVPacket pkt2 = *pkt;
1457 int64_t duration = srt_get_duration(&pkt2.data);
1458 pkt2.size -= pkt2.data - pkt->data;
1460 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1461 mkv_blockgroup_size(pkt2.size));
1462 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1463 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1464 end_ebml_master(pb, blockgroup);
1469 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1471 MatroskaMuxContext *mkv = s->priv_data;
1472 ebml_master blockgroup;
1473 int id_size, settings_size, size;
1474 uint8_t *id, *settings;
1475 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1476 const int flags = 0;
1479 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1483 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1486 size = id_size + 1 + settings_size + 1 + pkt->size;
1488 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1489 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1490 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1492 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1494 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1495 put_ebml_num(pb, size+4, 0);
1496 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1497 avio_wb16(pb, ts - mkv->cluster_pts);
1499 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1501 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1502 end_ebml_master(pb, blockgroup);
1504 return pkt->duration;
1507 static void mkv_flush_dynbuf(AVFormatContext *s)
1509 MatroskaMuxContext *mkv = s->priv_data;
1516 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1517 avio_write(s->pb, dyn_buf, bufsize);
1522 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1524 MatroskaMuxContext *mkv = s->priv_data;
1525 AVIOContext *pb = s->pb;
1526 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1527 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1528 int duration = pkt->duration;
1530 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1531 int64_t relative_packet_pos;
1533 if (ts == AV_NOPTS_VALUE) {
1534 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1535 return AVERROR(EINVAL);
1538 if (!s->pb->seekable) {
1540 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1541 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1548 if (mkv->cluster_pos == -1) {
1549 mkv->cluster_pos = avio_tell(s->pb);
1550 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1551 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1552 mkv->cluster_pts = FFMAX(0, ts);
1555 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1557 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1558 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1560 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1561 duration = mkv_write_ass_blocks(s, pb, pkt);
1563 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1564 duration = mkv_write_srt_blocks(s, pb, pkt);
1565 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1566 duration = mkv_write_vtt_blocks(s, pb, pkt);
1568 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1569 /* For backward compatibility, prefer convergence_duration. */
1570 if (pkt->convergence_duration > 0) {
1571 duration = pkt->convergence_duration;
1573 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1574 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1575 end_ebml_master(pb, blockgroup);
1578 if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) || codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1579 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos,
1580 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);
1581 if (ret < 0) return ret;
1584 mkv->duration = FFMAX(mkv->duration, ts + duration);
1588 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1590 MatroskaMuxContext *mkv = s->priv_data;
1591 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1592 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1594 int64_t cluster_time;
1598 if (mkv->tracks[pkt->stream_index].write_dts)
1599 cluster_time = pkt->dts - mkv->cluster_pts;
1601 cluster_time = pkt->pts - mkv->cluster_pts;
1603 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1604 // after 4k and on a keyframe
1605 if (s->pb->seekable) {
1607 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1610 cluster_size = avio_tell(pb);
1613 if (mkv->cluster_pos != -1 &&
1614 (cluster_size > mkv->cluster_size_limit ||
1615 cluster_time > mkv->cluster_time_limit ||
1616 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1617 cluster_size > 4 * 1024))) {
1618 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1619 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1620 avio_tell(pb), pkt->pts, pkt->dts);
1621 end_ebml_master(pb, mkv->cluster);
1622 mkv->cluster_pos = -1;
1624 mkv_flush_dynbuf(s);
1628 // check if we have an audio packet cached
1629 if (mkv->cur_audio_pkt.size > 0) {
1630 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1631 av_free_packet(&mkv->cur_audio_pkt);
1633 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1638 // buffer an audio packet to ensure the packet containing the video
1639 // keyframe's timecode is contained in the same cluster for WebM
1640 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1641 mkv->cur_audio_pkt = *pkt;
1643 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1644 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1646 ret = av_dup_packet(&mkv->cur_audio_pkt);
1647 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1648 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1651 ret = mkv_write_packet_internal(s, pkt);
1655 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1657 MatroskaMuxContext *mkv = s->priv_data;
1659 if (s->pb->seekable)
1664 if (mkv->cluster_pos != -1) {
1665 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1666 " bytes\n", avio_tell(pb));
1667 end_ebml_master(pb, mkv->cluster);
1668 mkv->cluster_pos = -1;
1670 mkv_flush_dynbuf(s);
1675 return mkv_write_packet(s, pkt);
1678 static int mkv_write_trailer(AVFormatContext *s)
1680 MatroskaMuxContext *mkv = s->priv_data;
1681 AVIOContext *pb = s->pb;
1682 int64_t currentpos, cuespos;
1685 // check if we have an audio packet cached
1686 if (mkv->cur_audio_pkt.size > 0) {
1687 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1688 av_free_packet(&mkv->cur_audio_pkt);
1690 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1696 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1697 mkv_flush_dynbuf(s);
1698 } else if (mkv->cluster_pos != -1) {
1699 end_ebml_master(pb, mkv->cluster);
1702 if (mkv->mode != MODE_WEBM) {
1703 ret = mkv_write_chapters(s);
1704 if (ret < 0) return ret;
1708 if (mkv->cues->num_entries) {
1709 if (mkv->reserve_cues_space) {
1712 currentpos = avio_tell(pb);
1713 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1715 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1716 cues_end = avio_tell(pb);
1717 if (cues_end > cuespos + mkv->reserve_cues_space) {
1718 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1719 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1720 cues_end - cuespos);
1721 return AVERROR(EINVAL);
1724 if (cues_end < cuespos + mkv->reserve_cues_space)
1725 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1727 avio_seek(pb, currentpos, SEEK_SET);
1729 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1732 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1733 if (ret < 0) return ret;
1736 mkv_write_seekhead(pb, mkv->main_seekhead);
1738 // update the duration
1739 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1740 currentpos = avio_tell(pb);
1741 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1742 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1744 avio_seek(pb, currentpos, SEEK_SET);
1747 end_ebml_master(pb, mkv->segment);
1748 av_freep(&mkv->tracks);
1749 av_freep(&mkv->cues->entries);
1750 av_freep(&mkv->cues);
1755 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1758 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1759 if (ff_mkv_codec_tags[i].id == codec_id)
1762 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1763 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1764 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1771 static const AVCodecTag additional_audio_tags[] = {
1772 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1773 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1774 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1775 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1776 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1777 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1778 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1779 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1780 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1781 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1782 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1783 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1784 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1787 static const AVCodecTag additional_video_tags[] = {
1788 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1789 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1790 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1791 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1792 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1793 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1796 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1797 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1798 static const AVOption options[] = {
1799 { "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 },
1800 { "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 },
1801 { "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 },
1805 #if CONFIG_MATROSKA_MUXER
1806 static const AVClass matroska_class = {
1807 .class_name = "matroska muxer",
1808 .item_name = av_default_item_name,
1810 .version = LIBAVUTIL_VERSION_INT,
1813 AVOutputFormat ff_matroska_muxer = {
1815 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1816 .mime_type = "video/x-matroska",
1817 .extensions = "mkv",
1818 .priv_data_size = sizeof(MatroskaMuxContext),
1819 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1820 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1821 .video_codec = CONFIG_LIBX264_ENCODER ?
1822 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1823 .write_header = mkv_write_header,
1824 .write_packet = mkv_write_flush_packet,
1825 .write_trailer = mkv_write_trailer,
1826 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1827 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1828 .codec_tag = (const AVCodecTag* const []){
1829 ff_codec_bmp_tags, ff_codec_wav_tags,
1830 additional_audio_tags, additional_video_tags, 0
1833 .subtitle_codec = AV_CODEC_ID_SSA,
1835 .subtitle_codec = AV_CODEC_ID_ASS,
1837 .query_codec = mkv_query_codec,
1838 .priv_class = &matroska_class,
1842 #if CONFIG_WEBM_MUXER
1843 static const AVClass webm_class = {
1844 .class_name = "webm muxer",
1845 .item_name = av_default_item_name,
1847 .version = LIBAVUTIL_VERSION_INT,
1850 AVOutputFormat ff_webm_muxer = {
1852 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1853 .mime_type = "video/webm",
1854 .extensions = "webm",
1855 .priv_data_size = sizeof(MatroskaMuxContext),
1856 .audio_codec = AV_CODEC_ID_VORBIS,
1857 .video_codec = AV_CODEC_ID_VP8,
1858 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1859 .write_header = mkv_write_header,
1860 .write_packet = mkv_write_flush_packet,
1861 .write_trailer = mkv_write_trailer,
1862 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1863 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1864 .priv_class = &webm_class,
1868 #if CONFIG_MATROSKA_AUDIO_MUXER
1869 static const AVClass mka_class = {
1870 .class_name = "matroska audio muxer",
1871 .item_name = av_default_item_name,
1873 .version = LIBAVUTIL_VERSION_INT,
1875 AVOutputFormat ff_matroska_audio_muxer = {
1877 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1878 .mime_type = "audio/x-matroska",
1879 .extensions = "mka",
1880 .priv_data_size = sizeof(MatroskaMuxContext),
1881 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1882 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1883 .video_codec = AV_CODEC_ID_NONE,
1884 .write_header = mkv_write_header,
1885 .write_packet = mkv_write_flush_packet,
1886 .write_trailer = mkv_write_trailer,
1887 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1889 .codec_tag = (const AVCodecTag* const []){
1890 ff_codec_wav_tags, additional_audio_tags, 0
1892 .priv_class = &mka_class,