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"
35 #include "vorbiscomment.h"
38 #include "libavutil/avstring.h"
39 #include "libavutil/channel_layout.h"
40 #include "libavutil/crc.h"
41 #include "libavutil/dict.h"
42 #include "libavutil/intfloat.h"
43 #include "libavutil/intreadwrite.h"
44 #include "libavutil/lfg.h"
45 #include "libavutil/mastering_display_metadata.h"
46 #include "libavutil/mathematics.h"
47 #include "libavutil/opt.h"
48 #include "libavutil/parseutils.h"
49 #include "libavutil/random_seed.h"
50 #include "libavutil/rational.h"
51 #include "libavutil/samplefmt.h"
52 #include "libavutil/sha.h"
53 #include "libavutil/stereo3d.h"
55 #include "libavcodec/xiph.h"
56 #include "libavcodec/mpeg4audio.h"
57 #include "libavcodec/internal.h"
59 typedef struct ebml_master {
60 int64_t pos; ///< absolute offset in the file where the master's elements start
61 int sizebytes; ///< how many bytes were reserved for the size
64 typedef struct mkv_seekhead_entry {
65 unsigned int elementid;
69 typedef struct mkv_seekhead {
71 int64_t segment_offset; ///< the file offset to the beginning of the segment
72 int reserved_size; ///< -1 if appending to file
74 mkv_seekhead_entry *entries;
78 typedef struct mkv_cuepoint {
82 int64_t cluster_pos; ///< file offset of the cluster containing the block
83 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
84 int64_t duration; ///< duration of the block according to time base
87 typedef struct mkv_cues {
88 int64_t segment_offset;
89 mkv_cuepoint *entries;
93 typedef struct mkv_track {
99 #define MODE_MATROSKAv2 0x01
100 #define MODE_WEBM 0x02
102 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
103 * range 1 to 126 (inclusive) */
104 #define MAX_TRACKS 126
106 typedef struct MatroskaMuxContext {
107 const AVClass *class;
110 AVIOContext *tags_bc;
112 AVIOContext *info_bc;
115 int64_t segment_offset;
117 int64_t cluster_pos; ///< file offset of the current cluster
119 int64_t duration_offset;
121 mkv_seekhead *main_seekhead;
125 AVPacket cur_audio_pkt;
127 int have_attachments;
130 int reserve_cues_space;
131 int cluster_size_limit;
133 int64_t cluster_time_limit;
135 int dash_track_number;
138 uint32_t chapter_id_offset;
141 int64_t last_track_timestamp[MAX_TRACKS];
143 int64_t* stream_durations;
144 int64_t* stream_duration_offsets;
147 } MatroskaMuxContext;
150 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
151 * offset, 4 bytes for target EBML ID */
152 #define MAX_SEEKENTRY_SIZE 21
154 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
156 #define MAX_CUETRACKPOS_SIZE 42
158 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
159 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
161 /** Seek preroll value for opus */
162 #define OPUS_SEEK_PREROLL 80000000
164 static int ebml_id_size(unsigned int id)
166 return (av_log2(id + 1) - 1) / 7 + 1;
169 static void put_ebml_id(AVIOContext *pb, unsigned int id)
171 int i = ebml_id_size(id);
173 avio_w8(pb, (uint8_t)(id >> (i * 8)));
177 * Write an EBML size meaning "unknown size".
179 * @param bytes The number of bytes the size should occupy (maximum: 8).
181 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
183 av_assert0(bytes <= 8);
184 avio_w8(pb, 0x1ff >> bytes);
185 ffio_fill(pb, 0xff, bytes - 1);
189 * Calculate how many bytes are needed to represent a given number in EBML.
191 static int ebml_num_size(uint64_t num)
194 while ((num + 1) >> bytes * 7)
200 * Write a number in EBML variable length format.
202 * @param bytes The number of bytes that need to be used to write the number.
203 * If zero, any number of bytes can be used.
205 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
207 int i, needed_bytes = ebml_num_size(num);
209 // sizes larger than this are currently undefined in EBML
210 av_assert0(num < (1ULL << 56) - 1);
213 // don't care how many bytes are used, so use the min
214 bytes = needed_bytes;
215 // the bytes needed to write the given size would exceed the bytes
216 // that we need to use, so write unknown size. This shouldn't happen.
217 av_assert0(bytes >= needed_bytes);
219 num |= 1ULL << bytes * 7;
220 for (i = bytes - 1; i >= 0; i--)
221 avio_w8(pb, (uint8_t)(num >> i * 8));
224 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
231 put_ebml_id(pb, elementid);
232 put_ebml_num(pb, bytes, 0);
233 for (i = bytes - 1; i >= 0; i--)
234 avio_w8(pb, (uint8_t)(val >> i * 8));
237 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
240 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
242 while (tmp>>=8) bytes++;
244 put_ebml_id(pb, elementid);
245 put_ebml_num(pb, bytes, 0);
246 for (i = bytes - 1; i >= 0; i--)
247 avio_w8(pb, (uint8_t)(val >> i * 8));
250 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
252 put_ebml_id(pb, elementid);
253 put_ebml_num(pb, 8, 0);
254 avio_wb64(pb, av_double2int(val));
257 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
258 const void *buf, int size)
260 put_ebml_id(pb, elementid);
261 put_ebml_num(pb, size, 0);
262 avio_write(pb, buf, size);
265 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
268 put_ebml_binary(pb, elementid, str, strlen(str));
272 * Write a void element of a given size. Useful for reserving space in
273 * the file to be written to later.
275 * @param size The number of bytes to reserve, which must be at least 2.
277 static void put_ebml_void(AVIOContext *pb, uint64_t size)
279 int64_t currentpos = avio_tell(pb);
281 av_assert0(size >= 2);
283 put_ebml_id(pb, EBML_ID_VOID);
284 // we need to subtract the length needed to store the size from the
285 // size we need to reserve so 2 cases, we use 8 bytes to store the
286 // size if possible, 1 byte otherwise
288 put_ebml_num(pb, size - 2, 0);
290 put_ebml_num(pb, size - 9, 8);
291 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
294 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
295 uint64_t expectedsize)
297 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
298 put_ebml_id(pb, elementid);
299 put_ebml_size_unknown(pb, bytes);
300 return (ebml_master) {avio_tell(pb), bytes };
303 static void end_ebml_master(AVIOContext *pb, ebml_master master)
305 int64_t pos = avio_tell(pb);
307 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
309 put_ebml_num(pb, pos - master.pos, master.sizebytes);
310 avio_seek(pb, pos, SEEK_SET);
313 static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, ebml_master *master,
314 unsigned int elementid, uint64_t expectedsize)
318 if (ret = avio_open_dyn_buf(dyn_cp) < 0)
322 *master = start_ebml_master(pb, elementid, expectedsize);
324 *master = start_ebml_master(*dyn_cp, elementid, expectedsize);
329 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
332 uint8_t *buf, crc[4];
336 size = avio_close_dyn_buf(*dyn_cp, &buf);
337 if (mkv->mode != MODE_WEBM) {
338 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf, size) ^ UINT32_MAX);
339 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
341 avio_write(pb, buf, size);
342 end_ebml_master(pb, master);
344 end_ebml_master(*dyn_cp, master);
345 size = avio_close_dyn_buf(*dyn_cp, &buf);
346 avio_write(pb, buf, size);
352 static void put_xiph_size(AVIOContext *pb, int size)
354 ffio_fill(pb, 255, size / 255);
355 avio_w8(pb, size % 255);
359 * Free the members allocated in the mux context.
361 static void mkv_free(MatroskaMuxContext *mkv) {
362 if (mkv->main_seekhead) {
363 av_freep(&mkv->main_seekhead->entries);
364 av_freep(&mkv->main_seekhead);
367 av_freep(&mkv->cues->entries);
368 av_freep(&mkv->cues);
370 av_freep(&mkv->tracks);
371 av_freep(&mkv->stream_durations);
372 av_freep(&mkv->stream_duration_offsets);
376 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
377 * elements. If a maximum number of elements is specified, enough space
378 * will be reserved at the current file location to write a seek head of
381 * @param segment_offset The absolute offset to the position in the file
382 * where the segment begins.
383 * @param numelements The maximum number of elements that will be indexed
384 * by this seek head, 0 if unlimited.
386 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
389 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
393 new_seekhead->segment_offset = segment_offset;
395 if (numelements > 0) {
396 new_seekhead->filepos = avio_tell(pb);
397 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
398 // and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
399 // that an EBML void element will fit afterwards
400 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
401 new_seekhead->max_entries = numelements;
402 put_ebml_void(pb, new_seekhead->reserved_size);
407 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
409 mkv_seekhead_entry *entries = seekhead->entries;
411 // don't store more elements than we reserved space for
412 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
415 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
417 return AVERROR(ENOMEM);
418 seekhead->entries = entries;
420 seekhead->entries[seekhead->num_entries].elementid = elementid;
421 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
427 * Write the seek head to the file and free it. If a maximum number of
428 * elements was specified to mkv_start_seekhead(), the seek head will
429 * be written at the location reserved for it. Otherwise, it is written
430 * at the current location in the file.
432 * @return The file offset where the seekhead was written,
433 * -1 if an error occurred.
435 static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
438 mkv_seekhead *seekhead = mkv->main_seekhead;
439 ebml_master metaseek, seekentry;
443 currentpos = avio_tell(pb);
445 if (seekhead->reserved_size > 0) {
446 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
452 if (start_ebml_master_crc32(pb, &dyn_cp, &metaseek, MATROSKA_ID_SEEKHEAD,
453 seekhead->reserved_size) < 0) {
458 for (i = 0; i < seekhead->num_entries; i++) {
459 mkv_seekhead_entry *entry = &seekhead->entries[i];
461 seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
463 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
464 put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
465 put_ebml_id(dyn_cp, entry->elementid);
467 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
468 end_ebml_master(dyn_cp, seekentry);
470 end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
472 if (seekhead->reserved_size > 0) {
473 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
474 put_ebml_void(pb, remaining);
475 avio_seek(pb, currentpos, SEEK_SET);
477 currentpos = seekhead->filepos;
480 av_freep(&mkv->main_seekhead->entries);
481 av_freep(&mkv->main_seekhead);
486 static mkv_cues *mkv_start_cues(int64_t segment_offset)
488 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
492 cues->segment_offset = segment_offset;
496 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
497 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
499 mkv_cuepoint *entries = cues->entries;
504 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
506 return AVERROR(ENOMEM);
507 cues->entries = entries;
509 cues->entries[cues->num_entries].pts = ts;
510 cues->entries[cues->num_entries].stream_idx = stream;
511 cues->entries[cues->num_entries].tracknum = tracknum;
512 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
513 cues->entries[cues->num_entries].relative_pos = relative_pos;
514 cues->entries[cues->num_entries++].duration = duration;
519 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
521 MatroskaMuxContext *mkv = s->priv_data;
522 AVIOContext *dyn_cp, *pb = s->pb;
523 ebml_master cues_element;
527 currentpos = avio_tell(pb);
528 ret = start_ebml_master_crc32(pb, &dyn_cp, &cues_element, MATROSKA_ID_CUES, 0);
532 for (i = 0; i < cues->num_entries; i++) {
533 ebml_master cuepoint, track_positions;
534 mkv_cuepoint *entry = &cues->entries[i];
535 uint64_t pts = entry->pts;
538 // Calculate the number of entries, so we know the element size
539 for (j = 0; j < num_tracks; j++)
540 tracks[j].has_cue = 0;
541 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
542 int tracknum = entry[j].stream_idx;
543 av_assert0(tracknum>=0 && tracknum<num_tracks);
544 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
546 tracks[tracknum].has_cue = 1;
550 cuepoint = start_ebml_master(dyn_cp, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
551 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETIME, pts);
553 // put all the entries from different tracks that have the exact same
554 // timestamp into the same CuePoint
555 for (j = 0; j < num_tracks; j++)
556 tracks[j].has_cue = 0;
557 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
558 int tracknum = entry[j].stream_idx;
559 av_assert0(tracknum>=0 && tracknum<num_tracks);
560 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
562 tracks[tracknum].has_cue = 1;
563 track_positions = start_ebml_master(dyn_cp, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
564 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETRACK , entry[j].tracknum );
565 put_ebml_uint(dyn_cp, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
566 put_ebml_uint(dyn_cp, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
567 if (entry[j].duration != -1)
568 put_ebml_uint(dyn_cp, MATROSKA_ID_CUEDURATION , entry[j].duration);
569 end_ebml_master(dyn_cp, track_positions);
572 end_ebml_master(dyn_cp, cuepoint);
574 end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
579 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
581 const uint8_t *header_start[3];
583 int first_header_size;
586 if (par->codec_id == AV_CODEC_ID_VORBIS)
587 first_header_size = 30;
589 first_header_size = 42;
591 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
592 first_header_size, header_start, header_len) < 0) {
593 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
597 avio_w8(pb, 2); // number packets - 1
598 for (j = 0; j < 2; j++) {
599 put_xiph_size(pb, header_len[j]);
601 for (j = 0; j < 3; j++)
602 avio_write(pb, header_start[j], header_len[j]);
607 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
609 if (par->extradata && par->extradata_size == 2)
610 avio_write(pb, par->extradata, 2);
612 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
616 static int put_flac_codecpriv(AVFormatContext *s,
617 AVIOContext *pb, AVCodecParameters *par)
619 int write_comment = (par->channel_layout &&
620 !(par->channel_layout & ~0x3ffffULL) &&
621 !ff_flac_is_native_layout(par->channel_layout));
622 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
629 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
630 "Lavf" : LIBAVFORMAT_IDENT;
631 AVDictionary *dict = NULL;
632 uint8_t buf[32], *data, *p;
635 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
636 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
638 len = ff_vorbiscomment_length(dict, vendor);
639 if (len >= ((1<<24) - 4))
640 return AVERROR(EINVAL);
642 data = av_malloc(len + 4);
645 return AVERROR(ENOMEM);
649 AV_WB24(data + 1, len);
652 ff_vorbiscomment_write(&p, &dict, vendor);
654 avio_write(pb, data, len + 4);
663 static int get_aac_sample_rates(AVFormatContext *s, AVCodecParameters *par,
664 int *sample_rate, int *output_sample_rate)
666 MPEG4AudioConfig mp4ac;
668 if (avpriv_mpeg4audio_get_config(&mp4ac, par->extradata,
669 par->extradata_size * 8, 1) < 0) {
670 av_log(s, AV_LOG_ERROR,
671 "Error parsing AAC extradata, unable to determine samplerate.\n");
672 return AVERROR(EINVAL);
675 *sample_rate = mp4ac.sample_rate;
676 *output_sample_rate = mp4ac.ext_sample_rate;
680 static int mkv_write_native_codecprivate(AVFormatContext *s,
681 AVCodecParameters *par,
684 switch (par->codec_id) {
685 case AV_CODEC_ID_VORBIS:
686 case AV_CODEC_ID_THEORA:
687 return put_xiph_codecpriv(s, dyn_cp, par);
688 case AV_CODEC_ID_FLAC:
689 return put_flac_codecpriv(s, dyn_cp, par);
690 case AV_CODEC_ID_WAVPACK:
691 return put_wv_codecpriv(dyn_cp, par);
692 case AV_CODEC_ID_H264:
693 return ff_isom_write_avcc(dyn_cp, par->extradata,
694 par->extradata_size);
695 case AV_CODEC_ID_HEVC:
696 ff_isom_write_hvcc(dyn_cp, par->extradata,
697 par->extradata_size, 0);
699 case AV_CODEC_ID_ALAC:
700 if (par->extradata_size < 36) {
701 av_log(s, AV_LOG_ERROR,
702 "Invalid extradata found, ALAC expects a 36-byte "
704 return AVERROR_INVALIDDATA;
706 avio_write(dyn_cp, par->extradata + 12,
707 par->extradata_size - 12);
710 if (par->codec_id == AV_CODEC_ID_PRORES &&
711 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
712 avio_wl32(dyn_cp, par->codec_tag);
713 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
714 avio_write(dyn_cp, par->extradata, par->extradata_size);
720 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
721 AVCodecParameters *par,
722 int native_id, int qt_id)
726 int ret, codecpriv_size;
728 ret = avio_open_dyn_buf(&dyn_cp);
733 ret = mkv_write_native_codecprivate(s, par, dyn_cp);
734 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
737 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
739 if (par->extradata_size) {
740 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
741 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id
744 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
745 avio_wl32(dyn_cp, par->codec_tag);
746 for(i = 0; i < 0x5a - 8; i++)
749 avio_write(dyn_cp, par->extradata, par->extradata_size);
752 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
753 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
754 avcodec_get_name(par->codec_id));
757 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
759 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
760 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
761 avcodec_get_name(par->codec_id));
762 ret = AVERROR(EINVAL);
765 ff_put_bmp_header(dyn_cp, par, ff_codec_bmp_tags, 0, 0);
767 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
769 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
771 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
772 avcodec_get_name(par->codec_id));
773 ret = AVERROR(EINVAL);
776 par->codec_tag = tag;
778 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
781 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
783 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
789 static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
791 uint8_t *colorinfo_ptr;
792 int side_data_size = 0;
793 int ret, colorinfo_size;
794 const uint8_t *side_data = av_stream_get_side_data(
795 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA, &side_data_size);
797 ret = avio_open_dyn_buf(&dyn_cp);
801 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
802 par->color_trc < AVCOL_TRC_NB) {
803 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
806 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
807 par->color_space < AVCOL_SPC_NB) {
808 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
810 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
811 par->color_primaries < AVCOL_PRI_NB) {
812 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
814 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
815 par->color_range < AVCOL_RANGE_NB) {
816 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
818 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
819 ebml_master meta_element = start_ebml_master(
820 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
821 const AVMasteringDisplayMetadata *metadata =
822 (const AVMasteringDisplayMetadata*)side_data;
823 if (metadata->has_primaries) {
824 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
825 av_q2d(metadata->display_primaries[0][0]));
826 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
827 av_q2d(metadata->display_primaries[0][1]));
828 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
829 av_q2d(metadata->display_primaries[1][0]));
830 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
831 av_q2d(metadata->display_primaries[1][1]));
832 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
833 av_q2d(metadata->display_primaries[2][0]));
834 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
835 av_q2d(metadata->display_primaries[2][1]));
836 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
837 av_q2d(metadata->white_point[0]));
838 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
839 av_q2d(metadata->white_point[1]));
841 if (metadata->has_luminance) {
842 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
843 av_q2d(metadata->max_luminance));
844 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
845 av_q2d(metadata->min_luminance));
847 end_ebml_master(dyn_cp, meta_element);
850 colorinfo_size = avio_close_dyn_buf(dyn_cp, &colorinfo_ptr);
851 if (colorinfo_size) {
852 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, 0);
853 avio_write(pb, colorinfo_ptr, colorinfo_size);
854 end_ebml_master(pb, colorinfo);
856 av_free(colorinfo_ptr);
860 static void mkv_write_field_order(AVIOContext *pb, int mode,
861 enum AVFieldOrder field_order)
863 switch (field_order) {
864 case AV_FIELD_UNKNOWN:
865 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
866 MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED);
868 case AV_FIELD_PROGRESSIVE:
869 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
870 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
876 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
877 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
878 if (mode != MODE_WEBM) {
879 switch (field_order) {
881 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
882 MATROSKA_VIDEO_FIELDORDER_TT);
885 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
886 MATROSKA_VIDEO_FIELDORDER_BB);
889 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
890 MATROSKA_VIDEO_FIELDORDER_TB);
893 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
894 MATROSKA_VIDEO_FIELDORDER_BT);
901 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
902 AVStream *st, int mode, int *h_width, int *h_height)
906 AVDictionaryEntry *tag;
907 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
911 // convert metadata into proper side data and add it to the stream
912 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
913 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
914 int stereo_mode = atoi(tag->value);
916 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
917 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
922 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
923 stereo_mode != 10 && stereo_mode != 12) {
924 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
930 // iterate to find the stereo3d side data
931 for (i = 0; i < st->nb_side_data; i++) {
932 AVPacketSideData sd = st->side_data[i];
933 if (sd.type == AV_PKT_DATA_STEREO3D) {
934 AVStereo3D *stereo = (AVStereo3D *)sd.data;
936 switch (stereo->type) {
938 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
940 case AV_STEREO3D_SIDEBYSIDE:
941 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
942 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
943 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
946 case AV_STEREO3D_TOPBOTTOM:
947 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
948 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
952 case AV_STEREO3D_CHECKERBOARD:
953 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
954 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
957 case AV_STEREO3D_LINES:
958 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
959 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
963 case AV_STEREO3D_COLUMNS:
964 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
965 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
969 case AV_STEREO3D_FRAMESEQUENCE:
970 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
971 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
979 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
982 // if webm, do not write unsupported modes
983 if ((mode == MODE_WEBM &&
984 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
985 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
986 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
987 av_log(s, AV_LOG_ERROR,
988 "The specified stereo mode is not valid.\n");
989 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
990 return AVERROR(EINVAL);
993 // write StereoMode if format is valid
994 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
999 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1000 int i, AVIOContext *pb, int default_stream_exists)
1002 AVStream *st = s->streams[i];
1003 AVCodecParameters *par = st->codecpar;
1004 ebml_master subinfo, track;
1007 int bit_depth = av_get_bits_per_sample(par->codec_id);
1008 int sample_rate = par->sample_rate;
1009 int output_sample_rate = 0;
1010 int display_width_div = 1;
1011 int display_height_div = 1;
1013 AVDictionaryEntry *tag;
1015 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1016 mkv->have_attachments = 1;
1020 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
1021 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1022 if (par->bits_per_raw_sample)
1023 bit_depth = par->bits_per_raw_sample;
1025 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1028 bit_depth = par->bits_per_coded_sample;
1031 if (par->codec_id == AV_CODEC_ID_AAC) {
1032 ret = get_aac_sample_rates(s, par, &sample_rate, &output_sample_rate);
1037 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1038 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1039 mkv->is_dash ? mkv->dash_track_number : i + 1);
1040 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1041 mkv->is_dash ? mkv->dash_track_number : i + 1);
1042 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1044 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1045 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1046 tag = av_dict_get(st->metadata, "language", NULL, 0);
1047 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1048 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
1049 } else if (tag && tag->value) {
1050 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
1053 // The default value for TRACKFLAGDEFAULT is 1, so add element
1054 // if we need to clear it.
1055 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1056 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1058 if (st->disposition & AV_DISPOSITION_FORCED)
1059 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1061 if (mkv->mode == MODE_WEBM && par->codec_id == AV_CODEC_ID_WEBVTT) {
1062 const char *codec_id;
1063 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1064 codec_id = "D_WEBVTT/CAPTIONS";
1065 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1066 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1067 codec_id = "D_WEBVTT/DESCRIPTIONS";
1068 native_id = MATROSKA_TRACK_TYPE_METADATA;
1069 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1070 codec_id = "D_WEBVTT/METADATA";
1071 native_id = MATROSKA_TRACK_TYPE_METADATA;
1073 codec_id = "D_WEBVTT/SUBTITLES";
1074 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1076 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1078 // look for a codec ID string specific to mkv to use,
1079 // if none are found, use AVI codes
1080 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1081 if (ff_mkv_codec_tags[j].id == par->codec_id) {
1082 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1087 if (par->codec_id == AV_CODEC_ID_RAWVIDEO && !par->codec_tag) {
1088 if (mkv->allow_raw_vfw) {
1091 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1092 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1093 return AVERROR(EINVAL);
1098 if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1099 int64_t codecdelay = av_rescale_q(par->initial_padding,
1100 (AVRational){ 1, 48000 },
1101 (AVRational){ 1, 1000000000 });
1102 if (codecdelay < 0) {
1103 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1104 return AVERROR(EINVAL);
1106 // mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1107 // (AVRational){ 1, par->sample_rate },
1110 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1112 if (par->codec_id == AV_CODEC_ID_OPUS) {
1113 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1116 if (mkv->mode == MODE_WEBM && !(par->codec_id == AV_CODEC_ID_VP8 ||
1117 par->codec_id == AV_CODEC_ID_VP9 ||
1118 par->codec_id == AV_CODEC_ID_OPUS ||
1119 par->codec_id == AV_CODEC_ID_VORBIS ||
1120 par->codec_id == AV_CODEC_ID_WEBVTT)) {
1121 av_log(s, AV_LOG_ERROR,
1122 "Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1123 return AVERROR(EINVAL);
1126 switch (par->codec_type) {
1127 case AVMEDIA_TYPE_VIDEO:
1128 mkv->have_video = 1;
1129 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1131 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1132 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1133 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1135 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->time_base.num / st->time_base.den);
1138 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1139 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1140 par->codec_id == AV_CODEC_ID_SVQ1 ||
1141 par->codec_id == AV_CODEC_ID_SVQ3 ||
1142 par->codec_id == AV_CODEC_ID_CINEPAK))
1146 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1147 else if (!native_id) {
1148 // if there is no mkv-specific codec ID, use VFW mode
1149 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1150 mkv->tracks[i].write_dts = 1;
1151 s->internal->avoid_negative_ts_use_pts = 0;
1154 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1156 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1157 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1159 mkv_write_field_order(pb, mkv->mode, par->field_order);
1161 // check both side data and metadata for stereo information,
1162 // write the result to the bitstream if any is found
1163 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1165 &display_height_div);
1169 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1170 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1171 (par->format == AV_PIX_FMT_YUVA420P)) {
1172 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1175 // write DisplayWidth and DisplayHeight, they contain the size of
1176 // a single source view and/or the display aspect ratio
1177 if (st->sample_aspect_ratio.num) {
1178 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1179 if (d_width > INT_MAX) {
1180 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1181 return AVERROR(EINVAL);
1183 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1184 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1185 } else if (display_width_div != 1 || display_height_div != 1) {
1186 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1187 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1190 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1191 uint32_t color_space = av_le2ne32(par->codec_tag);
1192 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1194 if (s->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
1195 ret = mkv_write_video_color(pb, par, st);
1199 end_ebml_master(pb, subinfo);
1202 case AVMEDIA_TYPE_AUDIO:
1203 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1206 // no mkv-specific ID, use ACM mode
1207 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1209 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1210 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1211 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1212 if (output_sample_rate)
1213 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1215 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1216 end_ebml_master(pb, subinfo);
1219 case AVMEDIA_TYPE_SUBTITLE:
1221 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1222 return AVERROR(ENOSYS);
1225 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1226 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1228 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1231 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1232 return AVERROR(EINVAL);
1235 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1236 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1241 end_ebml_master(pb, track);
1246 static int mkv_write_tracks(AVFormatContext *s)
1248 MatroskaMuxContext *mkv = s->priv_data;
1249 AVIOContext *dyn_cp, *pb = s->pb;
1251 int i, ret, default_stream_exists = 0;
1253 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1257 ret = start_ebml_master_crc32(pb, &dyn_cp, &tracks, MATROSKA_ID_TRACKS, 0);
1261 for (i = 0; i < s->nb_streams; i++) {
1262 AVStream *st = s->streams[i];
1263 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1265 for (i = 0; i < s->nb_streams; i++) {
1266 ret = mkv_write_track(s, mkv, i, dyn_cp, default_stream_exists);
1270 end_ebml_master_crc32(pb, &dyn_cp, mkv, tracks);
1274 static int mkv_write_chapters(AVFormatContext *s)
1276 MatroskaMuxContext *mkv = s->priv_data;
1277 AVIOContext *dyn_cp, *pb = s->pb;
1278 ebml_master chapters, editionentry;
1279 AVRational scale = {1, 1E9};
1282 if (!s->nb_chapters || mkv->wrote_chapters)
1285 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1286 if (ret < 0) return ret;
1288 ret = start_ebml_master_crc32(pb, &dyn_cp, &chapters, MATROSKA_ID_CHAPTERS, 0);
1289 if (ret < 0) return ret;
1291 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1292 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1293 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1294 for (i = 0; i < s->nb_chapters; i++) {
1295 ebml_master chapteratom, chapterdisplay;
1296 AVChapter *c = s->chapters[i];
1297 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1298 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1299 AVDictionaryEntry *t = NULL;
1300 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1301 av_log(s, AV_LOG_ERROR,
1302 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1303 chapterstart, chapterend);
1304 return AVERROR_INVALIDDATA;
1307 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1308 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1309 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1310 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1311 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1312 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1313 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1314 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1315 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1316 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1317 end_ebml_master(dyn_cp, chapterdisplay);
1319 end_ebml_master(dyn_cp, chapteratom);
1321 end_ebml_master(dyn_cp, editionentry);
1322 end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
1324 mkv->wrote_chapters = 1;
1328 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1330 uint8_t *key = av_strdup(t->key);
1332 const uint8_t *lang = NULL;
1336 return AVERROR(ENOMEM);
1338 if ((p = strrchr(p, '-')) &&
1339 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1346 else if (*p >= 'a' && *p <= 'z')
1351 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1352 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1354 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1355 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1356 end_ebml_master(pb, tag);
1362 static int mkv_write_tag_targets(AVFormatContext *s,
1363 unsigned int elementid, unsigned int uid,
1364 ebml_master *tags, ebml_master* tag)
1367 MatroskaMuxContext *mkv = s->priv_data;
1368 ebml_master targets;
1372 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1373 if (ret < 0) return ret;
1375 start_ebml_master_crc32(s->pb, &mkv->tags_bc, tags, MATROSKA_ID_TAGS, 0);
1379 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1380 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1382 put_ebml_uint(pb, elementid, uid);
1383 end_ebml_master(pb, targets);
1387 static int mkv_check_tag_name(const char *name, unsigned int elementid)
1389 return av_strcasecmp(name, "title") &&
1390 av_strcasecmp(name, "stereo_mode") &&
1391 av_strcasecmp(name, "creation_time") &&
1392 av_strcasecmp(name, "encoding_tool") &&
1393 av_strcasecmp(name, "duration") &&
1394 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1395 av_strcasecmp(name, "language"));
1398 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1399 unsigned int uid, ebml_master *tags)
1401 MatroskaMuxContext *mkv = s->priv_data;
1404 AVDictionaryEntry *t = NULL;
1406 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1410 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1411 if (mkv_check_tag_name(t->key, elementid)) {
1412 ret = mkv_write_simpletag(mkv->tags_bc, t);
1418 end_ebml_master(mkv->tags_bc, tag);
1422 static int mkv_check_tag(AVDictionary *m, unsigned int elementid)
1424 AVDictionaryEntry *t = NULL;
1426 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1427 if (mkv_check_tag_name(t->key, elementid))
1433 static int mkv_write_tags(AVFormatContext *s)
1435 MatroskaMuxContext *mkv = s->priv_data;
1438 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1440 if (mkv_check_tag(s->metadata, 0)) {
1441 ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
1442 if (ret < 0) return ret;
1445 for (i = 0; i < s->nb_streams; i++) {
1446 AVStream *st = s->streams[i];
1448 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1451 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
1452 if (ret < 0) return ret;
1455 if (s->pb->seekable && !mkv->is_live) {
1456 for (i = 0; i < s->nb_streams; i++) {
1458 ebml_master tag_target;
1461 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
1464 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1465 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1466 mkv->stream_duration_offsets[i] = avio_tell(pb);
1468 // Reserve space to write duration as a 20-byte string.
1469 // 2 (ebml id) + 1 (data size) + 20 (data)
1470 put_ebml_void(pb, 23);
1471 end_ebml_master(pb, tag);
1472 end_ebml_master(pb, tag_target);
1476 for (i = 0; i < s->nb_chapters; i++) {
1477 AVChapter *ch = s->chapters[i];
1479 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1482 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
1483 if (ret < 0) return ret;
1486 if (mkv->tags.pos) {
1487 if (s->pb->seekable && !mkv->is_live)
1488 put_ebml_void(s->pb, avio_tell(mkv->tags_bc) + ((mkv->mode != MODE_WEBM) ? 2 /* ebml id + data size */ + 4 /* CRC32 */ : 0));
1490 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1495 static int mkv_write_attachments(AVFormatContext *s)
1497 MatroskaMuxContext *mkv = s->priv_data;
1498 AVIOContext *dyn_cp, *pb = s->pb;
1499 ebml_master attachments;
1503 if (!mkv->have_attachments)
1506 av_lfg_init(&c, av_get_random_seed());
1508 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1509 if (ret < 0) return ret;
1511 ret = start_ebml_master_crc32(pb, &dyn_cp, &attachments, MATROSKA_ID_ATTACHMENTS, 0);
1512 if (ret < 0) return ret;
1514 for (i = 0; i < s->nb_streams; i++) {
1515 AVStream *st = s->streams[i];
1516 ebml_master attached_file;
1517 AVDictionaryEntry *t;
1518 const char *mimetype = NULL;
1521 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1524 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1526 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1527 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1528 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1529 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1530 return AVERROR(EINVAL);
1532 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1533 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1534 mimetype = t->value;
1535 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1537 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1538 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1539 mimetype = ff_mkv_mime_tags[i].str;
1542 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1543 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1544 mimetype = ff_mkv_image_mime_tags[i].str;
1549 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1550 "it cannot be deduced from the codec id.\n", i);
1551 return AVERROR(EINVAL);
1554 if (s->flags & AVFMT_FLAG_BITEXACT) {
1555 struct AVSHA *sha = av_sha_alloc();
1558 return AVERROR(ENOMEM);
1559 av_sha_init(sha, 160);
1560 av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1561 av_sha_final(sha, digest);
1563 fileuid = AV_RL64(digest);
1565 fileuid = av_lfg_get(&c);
1567 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1570 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1571 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1572 put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1573 end_ebml_master(dyn_cp, attached_file);
1575 end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
1580 static int64_t get_metadata_duration(AVFormatContext *s)
1586 AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1587 if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1588 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1592 for (i = 0; i < s->nb_streams; i++) {
1594 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1596 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1597 max = FFMAX(max, us);
1600 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1604 static int mkv_write_header(AVFormatContext *s)
1606 MatroskaMuxContext *mkv = s->priv_data;
1607 AVIOContext *pb = s->pb;
1608 ebml_master ebml_header;
1609 AVDictionaryEntry *tag;
1610 int ret, i, version = 2;
1611 int64_t creation_time;
1613 if (!strcmp(s->oformat->name, "webm"))
1614 mkv->mode = MODE_WEBM;
1616 mkv->mode = MODE_MATROSKAv2;
1618 if (mkv->mode != MODE_WEBM ||
1619 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1620 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1623 for (i = 0; i < s->nb_streams; i++) {
1624 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
1625 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
1626 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
1627 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
1628 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
1629 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
1630 av_log(s, AV_LOG_ERROR,
1631 "The Matroska muxer does not yet support muxing %s\n",
1632 avcodec_get_name(s->streams[i]->codecpar->codec_id));
1633 return AVERROR_PATCHWELCOME;
1635 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1636 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1637 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1641 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1643 ret = AVERROR(ENOMEM);
1646 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1647 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1648 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1649 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1650 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1651 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1652 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1653 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1654 end_ebml_master(pb, ebml_header);
1656 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1657 mkv->segment_offset = avio_tell(pb);
1659 // we write 2 seek heads - one at the end of the file to point to each
1660 // cluster, and one at the beginning to point to all other level one
1661 // elements (including the seek head at the end of the file), which
1662 // isn't more than 10 elements if we only write one of each other
1663 // currently defined level 1 element
1664 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1665 if (!mkv->main_seekhead) {
1666 ret = AVERROR(ENOMEM);
1670 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1671 if (ret < 0) goto fail;
1673 ret = start_ebml_master_crc32(pb, &mkv->info_bc, &mkv->info, MATROSKA_ID_INFO, 0);
1678 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1679 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1680 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1681 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1682 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1683 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1684 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1686 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1688 if (mkv->mode != MODE_WEBM) {
1689 uint32_t segment_uid[4];
1692 av_lfg_init(&lfg, av_get_random_seed());
1694 for (i = 0; i < 4; i++)
1695 segment_uid[i] = av_lfg_get(&lfg);
1697 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1700 const char *ident = "Lavf";
1701 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1702 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1705 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1706 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1707 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1708 uint8_t date_utc_buf[8];
1709 AV_WB64(date_utc_buf, date_utc);
1710 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1713 // reserve space for the duration
1715 mkv->duration_offset = avio_tell(pb);
1716 if (!mkv->is_live) {
1717 int64_t metadata_duration = get_metadata_duration(s);
1719 if (s->duration > 0) {
1720 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1721 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1722 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1723 } else if (metadata_duration > 0) {
1724 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1725 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1726 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1728 put_ebml_void(pb, 11); // assumes double-precision float to be written
1731 if (s->pb->seekable)
1732 put_ebml_void(s->pb, avio_tell(pb) + ((mkv->mode != MODE_WEBM) ? 2 /* ebml id + data size */ + 4 /* CRC32 */ : 0));
1734 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
1737 // initialize stream_duration fields
1738 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1739 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1741 ret = mkv_write_tracks(s);
1745 for (i = 0; i < s->nb_chapters; i++)
1746 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1748 if (mkv->mode != MODE_WEBM) {
1749 ret = mkv_write_chapters(s);
1753 ret = mkv_write_tags(s);
1757 ret = mkv_write_attachments(s);
1762 if (!s->pb->seekable && !mkv->is_live)
1763 mkv_write_seekhead(pb, mkv);
1765 mkv->cues = mkv_start_cues(mkv->segment_offset);
1767 ret = AVERROR(ENOMEM);
1770 if (pb->seekable && mkv->reserve_cues_space) {
1771 mkv->cues_pos = avio_tell(pb);
1772 put_ebml_void(pb, mkv->reserve_cues_space);
1775 av_init_packet(&mkv->cur_audio_pkt);
1776 mkv->cur_audio_pkt.size = 0;
1777 mkv->cluster_pos = -1;
1781 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1782 // after 4k and on a keyframe
1784 if (mkv->cluster_time_limit < 0)
1785 mkv->cluster_time_limit = 5000;
1786 if (mkv->cluster_size_limit < 0)
1787 mkv->cluster_size_limit = 5 * 1024 * 1024;
1789 if (mkv->cluster_time_limit < 0)
1790 mkv->cluster_time_limit = 1000;
1791 if (mkv->cluster_size_limit < 0)
1792 mkv->cluster_size_limit = 32 * 1024;
1801 static int mkv_blockgroup_size(int pkt_size)
1803 int size = pkt_size + 4;
1804 size += ebml_num_size(size);
1805 size += 2; // EBML ID for block and block duration
1806 size += 8; // max size of block duration
1807 size += ebml_num_size(size);
1808 size += 1; // blockgroup EBML ID
1812 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1819 dst = av_malloc(srclen);
1821 return AVERROR(ENOMEM);
1823 while (srclen >= WV_HEADER_SIZE) {
1826 ret = ff_wv_parse_header(&header, src);
1829 src += WV_HEADER_SIZE;
1830 srclen -= WV_HEADER_SIZE;
1832 if (srclen < header.blocksize) {
1833 ret = AVERROR_INVALIDDATA;
1837 if (header.initial) {
1838 AV_WL32(dst + offset, header.samples);
1841 AV_WL32(dst + offset, header.flags);
1842 AV_WL32(dst + offset + 4, header.crc);
1845 if (!(header.initial && header.final)) {
1846 AV_WL32(dst + offset, header.blocksize);
1850 memcpy(dst + offset, src, header.blocksize);
1851 src += header.blocksize;
1852 srclen -= header.blocksize;
1853 offset += header.blocksize;
1865 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1866 unsigned int blockid, AVPacket *pkt, int keyframe)
1868 MatroskaMuxContext *mkv = s->priv_data;
1869 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
1870 uint8_t *data = NULL, *side_data = NULL;
1871 int offset = 0, size = pkt->size, side_data_size = 0;
1872 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1873 uint64_t additional_id = 0;
1874 int64_t discard_padding = 0;
1875 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
1876 ebml_master block_group, block_additions, block_more;
1878 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1879 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
1880 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
1882 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
1883 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1884 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1885 else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
1886 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1887 /* extradata is Annex B, assume the bitstream is too and convert it */
1888 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1889 else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
1890 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1892 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1898 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
1899 /* Matroska specification requires to remove the first QuickTime atom
1905 side_data = av_packet_get_side_data(pkt,
1906 AV_PKT_DATA_SKIP_SAMPLES,
1909 if (side_data && side_data_size >= 10) {
1910 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1911 (AVRational){1, par->sample_rate},
1912 (AVRational){1, 1000000000});
1915 side_data = av_packet_get_side_data(pkt,
1916 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1919 additional_id = AV_RB64(side_data);
1921 side_data_size -= 8;
1924 if ((side_data_size && additional_id == 1) || discard_padding) {
1925 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1926 blockid = MATROSKA_ID_BLOCK;
1929 put_ebml_id(pb, blockid);
1930 put_ebml_num(pb, size + 4, 0);
1931 // this assumes stream_index is less than 126
1932 avio_w8(pb, 0x80 | track_number);
1933 avio_wb16(pb, ts - mkv->cluster_pts);
1934 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
1935 avio_write(pb, data + offset, size);
1936 if (data != pkt->data)
1939 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
1940 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
1941 mkv->last_track_timestamp[track_number - 1]);
1943 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
1945 if (discard_padding) {
1946 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1949 if (side_data_size && additional_id == 1) {
1950 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1951 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1952 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1953 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1954 put_ebml_num(pb, side_data_size, 0);
1955 avio_write(pb, side_data, side_data_size);
1956 end_ebml_master(pb, block_more);
1957 end_ebml_master(pb, block_additions);
1959 if ((side_data_size && additional_id == 1) || discard_padding) {
1960 end_ebml_master(pb, block_group);
1964 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1966 MatroskaMuxContext *mkv = s->priv_data;
1967 ebml_master blockgroup;
1968 int id_size, settings_size, size;
1969 uint8_t *id, *settings;
1970 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1971 const int flags = 0;
1974 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1978 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1981 size = id_size + 1 + settings_size + 1 + pkt->size;
1983 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1984 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
1985 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1987 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1989 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1990 put_ebml_num(pb, size + 4, 0);
1991 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1992 avio_wb16(pb, ts - mkv->cluster_pts);
1994 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1996 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1997 end_ebml_master(pb, blockgroup);
1999 return pkt->duration;
2002 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
2004 MatroskaMuxContext *mkv = s->priv_data;
2006 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2007 mkv->cluster_pos = -1;
2008 if (s->pb->seekable)
2009 av_log(s, AV_LOG_DEBUG,
2010 "Starting new cluster at offset %" PRIu64 " bytes, "
2011 "pts %" PRIu64 "dts %" PRIu64 "\n",
2012 avio_tell(s->pb), pkt->pts, pkt->dts);
2014 av_log(s, AV_LOG_DEBUG, "Starting new cluster, "
2015 "pts %" PRIu64 "dts %" PRIu64 "\n",
2016 pkt->pts, pkt->dts);
2020 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2022 MatroskaMuxContext *mkv = s->priv_data;
2023 AVIOContext *pb = s->pb;
2024 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2025 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2026 int duration = pkt->duration;
2028 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2029 int64_t relative_packet_pos;
2030 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
2032 if (ts == AV_NOPTS_VALUE) {
2033 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2034 return AVERROR(EINVAL);
2036 ts += mkv->tracks[pkt->stream_index].ts_offset;
2038 if (mkv->cluster_pos != -1) {
2039 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
2040 if ((int16_t)cluster_time != cluster_time) {
2041 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2042 mkv_start_new_cluster(s, pkt);
2046 if (mkv->cluster_pos == -1) {
2047 mkv->cluster_pos = avio_tell(s->pb);
2048 ret = start_ebml_master_crc32(s->pb, &mkv->dyn_bc, &mkv->cluster, MATROSKA_ID_CLUSTER, 0);
2051 put_ebml_uint(mkv->dyn_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2052 mkv->cluster_pts = FFMAX(0, ts);
2056 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos + avio_tell(pb);
2058 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2059 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2060 if (s->pb->seekable && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2061 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
2062 if (ret < 0) return ret;
2065 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2066 duration = mkv_write_vtt_blocks(s, pb, pkt);
2068 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2069 mkv_blockgroup_size(pkt->size));
2071 #if FF_API_CONVERGENCE_DURATION
2072 FF_DISABLE_DEPRECATION_WARNINGS
2073 /* For backward compatibility, prefer convergence_duration. */
2074 if (pkt->convergence_duration > 0) {
2075 duration = pkt->convergence_duration;
2077 FF_ENABLE_DEPRECATION_WARNINGS
2079 /* All subtitle blocks are considered to be keyframes. */
2080 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2081 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2082 end_ebml_master(pb, blockgroup);
2085 if (s->pb->seekable) {
2086 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
2087 mkv->cluster_pos, relative_packet_pos, duration);
2093 mkv->duration = FFMAX(mkv->duration, ts + duration);
2095 if (mkv->stream_durations)
2096 mkv->stream_durations[pkt->stream_index] =
2097 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
2102 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2104 MatroskaMuxContext *mkv = s->priv_data;
2105 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2106 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2108 int64_t cluster_time;
2110 int start_new_cluster;
2112 if (mkv->tracks[pkt->stream_index].write_dts)
2113 cluster_time = pkt->dts - mkv->cluster_pts;
2115 cluster_time = pkt->pts - mkv->cluster_pts;
2116 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2118 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2119 // after 4k and on a keyframe
2120 cluster_size = avio_tell(mkv->dyn_bc);
2122 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2123 // WebM DASH specification states that the first block of every cluster
2124 // has to be a key frame. So for DASH video, we only create a cluster
2125 // on seeing key frames.
2126 start_new_cluster = keyframe;
2127 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2128 (mkv->cluster_pos == -1 ||
2129 cluster_time > mkv->cluster_time_limit)) {
2130 // For DASH audio, we create a Cluster based on cluster_time_limit
2131 start_new_cluster = 1;
2132 } else if (!mkv->is_dash &&
2133 (cluster_size > mkv->cluster_size_limit ||
2134 cluster_time > mkv->cluster_time_limit ||
2135 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2136 cluster_size > 4 * 1024))) {
2137 start_new_cluster = 1;
2139 start_new_cluster = 0;
2142 if (mkv->cluster_pos != -1 && start_new_cluster) {
2143 mkv_start_new_cluster(s, pkt);
2146 if (!mkv->cluster_pos)
2147 avio_write_marker(s->pb,
2148 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2149 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2151 // check if we have an audio packet cached
2152 if (mkv->cur_audio_pkt.size > 0) {
2153 // for DASH audio, a CuePoint has to be added when there is a new cluster.
2154 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2155 mkv->is_dash ? start_new_cluster : 0);
2156 av_packet_unref(&mkv->cur_audio_pkt);
2158 av_log(s, AV_LOG_ERROR,
2159 "Could not write cached audio packet ret:%d\n", ret);
2164 // buffer an audio packet to ensure the packet containing the video
2165 // keyframe's timecode is contained in the same cluster for WebM
2166 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2167 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2169 ret = mkv_write_packet_internal(s, pkt, 0);
2173 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2175 MatroskaMuxContext *mkv = s->priv_data;
2178 if (mkv->cluster_pos != -1) {
2179 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2180 mkv->cluster_pos = -1;
2181 if (s->pb->seekable)
2182 av_log(s, AV_LOG_DEBUG,
2183 "Flushing cluster at offset %" PRIu64 " bytes\n",
2186 av_log(s, AV_LOG_DEBUG, "Flushing cluster\n");
2191 return mkv_write_packet(s, pkt);
2194 static int mkv_write_trailer(AVFormatContext *s)
2196 MatroskaMuxContext *mkv = s->priv_data;
2197 AVIOContext *pb = s->pb;
2198 int64_t currentpos, cuespos;
2201 // check if we have an audio packet cached
2202 if (mkv->cur_audio_pkt.size > 0) {
2203 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2204 av_packet_unref(&mkv->cur_audio_pkt);
2206 av_log(s, AV_LOG_ERROR,
2207 "Could not write cached audio packet ret:%d\n", ret);
2213 end_ebml_master_crc32(pb, &mkv->dyn_bc, mkv, mkv->cluster);
2216 if (mkv->mode != MODE_WEBM) {
2217 ret = mkv_write_chapters(s);
2223 if (mkv->cues->num_entries) {
2224 if (mkv->reserve_cues_space) {
2227 currentpos = avio_tell(pb);
2228 avio_seek(pb, mkv->cues_pos, SEEK_SET);
2230 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2231 cues_end = avio_tell(pb);
2232 if (cues_end > cuespos + mkv->reserve_cues_space) {
2233 av_log(s, AV_LOG_ERROR,
2234 "Insufficient space reserved for cues: %d "
2235 "(needed: %" PRId64 ").\n",
2236 mkv->reserve_cues_space, cues_end - cuespos);
2237 return AVERROR(EINVAL);
2240 if (cues_end < cuespos + mkv->reserve_cues_space)
2241 put_ebml_void(pb, mkv->reserve_cues_space -
2242 (cues_end - cuespos));
2244 avio_seek(pb, currentpos, SEEK_SET);
2246 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2249 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2255 mkv_write_seekhead(pb, mkv);
2257 // update the duration
2258 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2259 currentpos = avio_tell(pb);
2260 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2261 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2262 avio_seek(pb, mkv->info.pos, SEEK_SET);
2263 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
2265 // update stream durations
2266 if (mkv->stream_durations) {
2268 for (i = 0; i < s->nb_streams; ++i) {
2269 AVStream *st = s->streams[i];
2270 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2271 char duration_string[20] = "";
2273 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2274 mkv->stream_durations[i]);
2276 if (!mkv->is_live && mkv->stream_duration_offsets[i] > 0) {
2277 avio_seek(mkv->tags_bc, mkv->stream_duration_offsets[i], SEEK_SET);
2279 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2280 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2281 fmod(duration_sec, 60));
2283 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2287 if (mkv->tags.pos && !mkv->is_live) {
2288 avio_seek(pb, mkv->tags.pos, SEEK_SET);
2289 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
2292 avio_seek(pb, currentpos, SEEK_SET);
2295 if (!mkv->is_live) {
2296 end_ebml_master(pb, mkv->segment);
2303 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2306 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2307 if (ff_mkv_codec_tags[i].id == codec_id)
2310 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2311 enum AVMediaType type = avcodec_get_type(codec_id);
2312 // mkv theoretically supports any video/audio through VFW/ACM
2313 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2320 static int mkv_init(struct AVFormatContext *s)
2324 if (s->avoid_negative_ts < 0) {
2325 s->avoid_negative_ts = 1;
2326 s->internal->avoid_negative_ts_use_pts = 1;
2329 for (i = 0; i < s->nb_streams; i++) {
2330 // ms precision is the de-facto standard timescale for mkv files
2331 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2337 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2340 AVStream *st = s->streams[pkt->stream_index];
2342 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2343 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2344 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2345 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2346 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2352 static const AVCodecTag additional_audio_tags[] = {
2353 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2354 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
2355 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2356 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2357 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2358 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2359 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2360 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2361 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2362 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2363 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2364 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2365 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2368 static const AVCodecTag additional_video_tags[] = {
2369 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2370 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2371 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2372 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
2373 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
2374 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2377 static const AVCodecTag additional_subtitle_tags[] = {
2378 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2379 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2380 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2383 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2384 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2385 static const AVOption options[] = {
2386 { "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 },
2387 { "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 },
2388 { "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 },
2389 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2390 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2391 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2392 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2396 #if CONFIG_MATROSKA_MUXER
2397 static const AVClass matroska_class = {
2398 .class_name = "matroska muxer",
2399 .item_name = av_default_item_name,
2401 .version = LIBAVUTIL_VERSION_INT,
2404 AVOutputFormat ff_matroska_muxer = {
2406 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2407 .mime_type = "video/x-matroska",
2408 .extensions = "mkv",
2409 .priv_data_size = sizeof(MatroskaMuxContext),
2410 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2411 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2412 .video_codec = CONFIG_LIBX264_ENCODER ?
2413 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2415 .write_header = mkv_write_header,
2416 .write_packet = mkv_write_flush_packet,
2417 .write_trailer = mkv_write_trailer,
2418 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2419 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2420 .codec_tag = (const AVCodecTag* const []){
2421 ff_codec_bmp_tags, ff_codec_wav_tags,
2422 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2424 .subtitle_codec = AV_CODEC_ID_ASS,
2425 .query_codec = mkv_query_codec,
2426 .check_bitstream = mkv_check_bitstream,
2427 .priv_class = &matroska_class,
2431 #if CONFIG_WEBM_MUXER
2432 static const AVClass webm_class = {
2433 .class_name = "webm muxer",
2434 .item_name = av_default_item_name,
2436 .version = LIBAVUTIL_VERSION_INT,
2439 AVOutputFormat ff_webm_muxer = {
2441 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2442 .mime_type = "video/webm",
2443 .extensions = "webm",
2444 .priv_data_size = sizeof(MatroskaMuxContext),
2445 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2446 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2447 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2449 .write_header = mkv_write_header,
2450 .write_packet = mkv_write_flush_packet,
2451 .write_trailer = mkv_write_trailer,
2452 .check_bitstream = mkv_check_bitstream,
2453 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2454 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2455 .priv_class = &webm_class,
2459 #if CONFIG_MATROSKA_AUDIO_MUXER
2460 static const AVClass mka_class = {
2461 .class_name = "matroska audio muxer",
2462 .item_name = av_default_item_name,
2464 .version = LIBAVUTIL_VERSION_INT,
2466 AVOutputFormat ff_matroska_audio_muxer = {
2468 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2469 .mime_type = "audio/x-matroska",
2470 .extensions = "mka",
2471 .priv_data_size = sizeof(MatroskaMuxContext),
2472 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2473 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2474 .video_codec = AV_CODEC_ID_NONE,
2476 .write_header = mkv_write_header,
2477 .write_packet = mkv_write_flush_packet,
2478 .write_trailer = mkv_write_trailer,
2479 .check_bitstream = mkv_check_bitstream,
2480 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2482 .codec_tag = (const AVCodecTag* const []){
2483 ff_codec_wav_tags, additional_audio_tags, 0
2485 .priv_class = &mka_class,