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;
139 uint32_t chapter_id_offset;
142 int64_t last_track_timestamp[MAX_TRACKS];
144 int64_t* stream_durations;
145 int64_t* stream_duration_offsets;
148 } MatroskaMuxContext;
151 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
152 * offset, 4 bytes for target EBML ID */
153 #define MAX_SEEKENTRY_SIZE 21
155 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
157 #define MAX_CUETRACKPOS_SIZE 42
159 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
160 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
162 /** Seek preroll value for opus */
163 #define OPUS_SEEK_PREROLL 80000000
165 static int ebml_id_size(unsigned int id)
167 return (av_log2(id + 1) - 1) / 7 + 1;
170 static void put_ebml_id(AVIOContext *pb, unsigned int id)
172 int i = ebml_id_size(id);
174 avio_w8(pb, (uint8_t)(id >> (i * 8)));
178 * Write an EBML size meaning "unknown size".
180 * @param bytes The number of bytes the size should occupy (maximum: 8).
182 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
184 av_assert0(bytes <= 8);
185 avio_w8(pb, 0x1ff >> bytes);
186 ffio_fill(pb, 0xff, bytes - 1);
190 * Calculate how many bytes are needed to represent a given number in EBML.
192 static int ebml_num_size(uint64_t num)
195 while ((num + 1) >> bytes * 7)
201 * Write a number in EBML variable length format.
203 * @param bytes The number of bytes that need to be used to write the number.
204 * If zero, any number of bytes can be used.
206 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
208 int i, needed_bytes = ebml_num_size(num);
210 // sizes larger than this are currently undefined in EBML
211 av_assert0(num < (1ULL << 56) - 1);
214 // don't care how many bytes are used, so use the min
215 bytes = needed_bytes;
216 // the bytes needed to write the given size would exceed the bytes
217 // that we need to use, so write unknown size. This shouldn't happen.
218 av_assert0(bytes >= needed_bytes);
220 num |= 1ULL << bytes * 7;
221 for (i = bytes - 1; i >= 0; i--)
222 avio_w8(pb, (uint8_t)(num >> i * 8));
225 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
232 put_ebml_id(pb, elementid);
233 put_ebml_num(pb, bytes, 0);
234 for (i = bytes - 1; i >= 0; i--)
235 avio_w8(pb, (uint8_t)(val >> i * 8));
238 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
241 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
243 while (tmp>>=8) bytes++;
245 put_ebml_id(pb, elementid);
246 put_ebml_num(pb, bytes, 0);
247 for (i = bytes - 1; i >= 0; i--)
248 avio_w8(pb, (uint8_t)(val >> i * 8));
251 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
253 put_ebml_id(pb, elementid);
254 put_ebml_num(pb, 8, 0);
255 avio_wb64(pb, av_double2int(val));
258 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
259 const void *buf, int size)
261 put_ebml_id(pb, elementid);
262 put_ebml_num(pb, size, 0);
263 avio_write(pb, buf, size);
266 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
269 put_ebml_binary(pb, elementid, str, strlen(str));
273 * Write a void element of a given size. Useful for reserving space in
274 * the file to be written to later.
276 * @param size The number of bytes to reserve, which must be at least 2.
278 static void put_ebml_void(AVIOContext *pb, uint64_t size)
280 int64_t currentpos = avio_tell(pb);
282 av_assert0(size >= 2);
284 put_ebml_id(pb, EBML_ID_VOID);
285 // we need to subtract the length needed to store the size from the
286 // size we need to reserve so 2 cases, we use 8 bytes to store the
287 // size if possible, 1 byte otherwise
289 put_ebml_num(pb, size - 2, 0);
291 put_ebml_num(pb, size - 9, 8);
292 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
295 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
296 uint64_t expectedsize)
298 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
299 put_ebml_id(pb, elementid);
300 put_ebml_size_unknown(pb, bytes);
301 return (ebml_master) {avio_tell(pb), bytes };
304 static void end_ebml_master(AVIOContext *pb, ebml_master master)
306 int64_t pos = avio_tell(pb);
308 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
310 put_ebml_num(pb, pos - master.pos, master.sizebytes);
311 avio_seek(pb, pos, SEEK_SET);
314 static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, ebml_master *master,
315 unsigned int elementid, uint64_t expectedsize)
319 if (ret = avio_open_dyn_buf(dyn_cp) < 0)
323 *master = start_ebml_master(pb, elementid, expectedsize);
325 *master = start_ebml_master(*dyn_cp, elementid, expectedsize);
330 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
333 uint8_t *buf, crc[4];
337 size = avio_close_dyn_buf(*dyn_cp, &buf);
338 if (mkv->write_crc && mkv->mode != MODE_WEBM) {
339 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf, size) ^ UINT32_MAX);
340 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
342 avio_write(pb, buf, size);
343 end_ebml_master(pb, master);
345 end_ebml_master(*dyn_cp, master);
346 size = avio_close_dyn_buf(*dyn_cp, &buf);
347 avio_write(pb, buf, size);
353 static void put_xiph_size(AVIOContext *pb, int size)
355 ffio_fill(pb, 255, size / 255);
356 avio_w8(pb, size % 255);
360 * Free the members allocated in the mux context.
362 static void mkv_free(MatroskaMuxContext *mkv) {
363 if (mkv->main_seekhead) {
364 av_freep(&mkv->main_seekhead->entries);
365 av_freep(&mkv->main_seekhead);
368 av_freep(&mkv->cues->entries);
369 av_freep(&mkv->cues);
371 av_freep(&mkv->tracks);
372 av_freep(&mkv->stream_durations);
373 av_freep(&mkv->stream_duration_offsets);
377 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
378 * elements. If a maximum number of elements is specified, enough space
379 * will be reserved at the current file location to write a seek head of
382 * @param segment_offset The absolute offset to the position in the file
383 * where the segment begins.
384 * @param numelements The maximum number of elements that will be indexed
385 * by this seek head, 0 if unlimited.
387 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
390 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
394 new_seekhead->segment_offset = segment_offset;
396 if (numelements > 0) {
397 new_seekhead->filepos = avio_tell(pb);
398 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
399 // and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
400 // that an EBML void element will fit afterwards
401 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
402 new_seekhead->max_entries = numelements;
403 put_ebml_void(pb, new_seekhead->reserved_size);
408 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
410 mkv_seekhead_entry *entries = seekhead->entries;
412 // don't store more elements than we reserved space for
413 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
416 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
418 return AVERROR(ENOMEM);
419 seekhead->entries = entries;
421 seekhead->entries[seekhead->num_entries].elementid = elementid;
422 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
428 * Write the seek head to the file and free it. If a maximum number of
429 * elements was specified to mkv_start_seekhead(), the seek head will
430 * be written at the location reserved for it. Otherwise, it is written
431 * at the current location in the file.
433 * @return The file offset where the seekhead was written,
434 * -1 if an error occurred.
436 static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
439 mkv_seekhead *seekhead = mkv->main_seekhead;
440 ebml_master metaseek, seekentry;
444 currentpos = avio_tell(pb);
446 if (seekhead->reserved_size > 0) {
447 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
453 if (start_ebml_master_crc32(pb, &dyn_cp, &metaseek, MATROSKA_ID_SEEKHEAD,
454 seekhead->reserved_size) < 0) {
459 for (i = 0; i < seekhead->num_entries; i++) {
460 mkv_seekhead_entry *entry = &seekhead->entries[i];
462 seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
464 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
465 put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
466 put_ebml_id(dyn_cp, entry->elementid);
468 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
469 end_ebml_master(dyn_cp, seekentry);
471 end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
473 if (seekhead->reserved_size > 0) {
474 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
475 put_ebml_void(pb, remaining);
476 avio_seek(pb, currentpos, SEEK_SET);
478 currentpos = seekhead->filepos;
481 av_freep(&mkv->main_seekhead->entries);
482 av_freep(&mkv->main_seekhead);
487 static mkv_cues *mkv_start_cues(int64_t segment_offset)
489 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
493 cues->segment_offset = segment_offset;
497 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
498 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
500 mkv_cuepoint *entries = cues->entries;
505 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
507 return AVERROR(ENOMEM);
508 cues->entries = entries;
510 cues->entries[cues->num_entries].pts = ts;
511 cues->entries[cues->num_entries].stream_idx = stream;
512 cues->entries[cues->num_entries].tracknum = tracknum;
513 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
514 cues->entries[cues->num_entries].relative_pos = relative_pos;
515 cues->entries[cues->num_entries++].duration = duration;
520 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
522 MatroskaMuxContext *mkv = s->priv_data;
523 AVIOContext *dyn_cp, *pb = s->pb;
524 ebml_master cues_element;
528 currentpos = avio_tell(pb);
529 ret = start_ebml_master_crc32(pb, &dyn_cp, &cues_element, MATROSKA_ID_CUES, 0);
533 for (i = 0; i < cues->num_entries; i++) {
534 ebml_master cuepoint, track_positions;
535 mkv_cuepoint *entry = &cues->entries[i];
536 uint64_t pts = entry->pts;
539 // Calculate the number of entries, so we know the element size
540 for (j = 0; j < num_tracks; j++)
541 tracks[j].has_cue = 0;
542 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
543 int tracknum = entry[j].stream_idx;
544 av_assert0(tracknum>=0 && tracknum<num_tracks);
545 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
547 tracks[tracknum].has_cue = 1;
551 cuepoint = start_ebml_master(dyn_cp, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
552 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETIME, pts);
554 // put all the entries from different tracks that have the exact same
555 // timestamp into the same CuePoint
556 for (j = 0; j < num_tracks; j++)
557 tracks[j].has_cue = 0;
558 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
559 int tracknum = entry[j].stream_idx;
560 av_assert0(tracknum>=0 && tracknum<num_tracks);
561 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
563 tracks[tracknum].has_cue = 1;
564 track_positions = start_ebml_master(dyn_cp, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
565 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETRACK , entry[j].tracknum );
566 put_ebml_uint(dyn_cp, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
567 put_ebml_uint(dyn_cp, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
568 if (entry[j].duration != -1)
569 put_ebml_uint(dyn_cp, MATROSKA_ID_CUEDURATION , entry[j].duration);
570 end_ebml_master(dyn_cp, track_positions);
573 end_ebml_master(dyn_cp, cuepoint);
575 end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
580 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
582 const uint8_t *header_start[3];
584 int first_header_size;
587 if (par->codec_id == AV_CODEC_ID_VORBIS)
588 first_header_size = 30;
590 first_header_size = 42;
592 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
593 first_header_size, header_start, header_len) < 0) {
594 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
598 avio_w8(pb, 2); // number packets - 1
599 for (j = 0; j < 2; j++) {
600 put_xiph_size(pb, header_len[j]);
602 for (j = 0; j < 3; j++)
603 avio_write(pb, header_start[j], header_len[j]);
608 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
610 if (par->extradata && par->extradata_size == 2)
611 avio_write(pb, par->extradata, 2);
613 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
617 static int put_flac_codecpriv(AVFormatContext *s,
618 AVIOContext *pb, AVCodecParameters *par)
620 int write_comment = (par->channel_layout &&
621 !(par->channel_layout & ~0x3ffffULL) &&
622 !ff_flac_is_native_layout(par->channel_layout));
623 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
630 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
631 "Lavf" : LIBAVFORMAT_IDENT;
632 AVDictionary *dict = NULL;
633 uint8_t buf[32], *data, *p;
636 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
637 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
639 len = ff_vorbiscomment_length(dict, vendor);
640 if (len >= ((1<<24) - 4))
641 return AVERROR(EINVAL);
643 data = av_malloc(len + 4);
646 return AVERROR(ENOMEM);
650 AV_WB24(data + 1, len);
653 ff_vorbiscomment_write(&p, &dict, vendor);
655 avio_write(pb, data, len + 4);
664 static int get_aac_sample_rates(AVFormatContext *s, AVCodecParameters *par,
665 int *sample_rate, int *output_sample_rate)
667 MPEG4AudioConfig mp4ac;
669 if (avpriv_mpeg4audio_get_config(&mp4ac, par->extradata,
670 par->extradata_size * 8, 1) < 0) {
671 av_log(s, AV_LOG_ERROR,
672 "Error parsing AAC extradata, unable to determine samplerate.\n");
673 return AVERROR(EINVAL);
676 *sample_rate = mp4ac.sample_rate;
677 *output_sample_rate = mp4ac.ext_sample_rate;
681 static int mkv_write_native_codecprivate(AVFormatContext *s,
682 AVCodecParameters *par,
685 switch (par->codec_id) {
686 case AV_CODEC_ID_VORBIS:
687 case AV_CODEC_ID_THEORA:
688 return put_xiph_codecpriv(s, dyn_cp, par);
689 case AV_CODEC_ID_FLAC:
690 return put_flac_codecpriv(s, dyn_cp, par);
691 case AV_CODEC_ID_WAVPACK:
692 return put_wv_codecpriv(dyn_cp, par);
693 case AV_CODEC_ID_H264:
694 return ff_isom_write_avcc(dyn_cp, par->extradata,
695 par->extradata_size);
696 case AV_CODEC_ID_HEVC:
697 ff_isom_write_hvcc(dyn_cp, par->extradata,
698 par->extradata_size, 0);
700 case AV_CODEC_ID_ALAC:
701 if (par->extradata_size < 36) {
702 av_log(s, AV_LOG_ERROR,
703 "Invalid extradata found, ALAC expects a 36-byte "
705 return AVERROR_INVALIDDATA;
707 avio_write(dyn_cp, par->extradata + 12,
708 par->extradata_size - 12);
711 if (par->codec_id == AV_CODEC_ID_PRORES &&
712 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
713 avio_wl32(dyn_cp, par->codec_tag);
714 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
715 avio_write(dyn_cp, par->extradata, par->extradata_size);
721 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
722 AVCodecParameters *par,
723 int native_id, int qt_id)
727 int ret, codecpriv_size;
729 ret = avio_open_dyn_buf(&dyn_cp);
734 ret = mkv_write_native_codecprivate(s, par, dyn_cp);
735 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
738 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
740 if (par->extradata_size) {
741 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
742 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id
745 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
746 avio_wl32(dyn_cp, par->codec_tag);
747 for(i = 0; i < 0x5a - 8; i++)
750 avio_write(dyn_cp, par->extradata, par->extradata_size);
753 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
754 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
755 avcodec_get_name(par->codec_id));
758 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
760 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
761 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
762 avcodec_get_name(par->codec_id));
763 ret = AVERROR(EINVAL);
766 ff_put_bmp_header(dyn_cp, par, ff_codec_bmp_tags, 0, 0);
768 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
770 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
772 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
773 avcodec_get_name(par->codec_id));
774 ret = AVERROR(EINVAL);
777 par->codec_tag = tag;
779 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
782 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
784 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
790 static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
792 uint8_t *colorinfo_ptr;
793 int side_data_size = 0;
794 int ret, colorinfo_size;
795 const uint8_t *side_data = av_stream_get_side_data(
796 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA, &side_data_size);
798 ret = avio_open_dyn_buf(&dyn_cp);
802 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
803 par->color_trc < AVCOL_TRC_NB) {
804 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
807 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
808 par->color_space < AVCOL_SPC_NB) {
809 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
811 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
812 par->color_primaries < AVCOL_PRI_NB) {
813 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
815 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
816 par->color_range < AVCOL_RANGE_NB) {
817 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
819 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
820 ebml_master meta_element = start_ebml_master(
821 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
822 const AVMasteringDisplayMetadata *metadata =
823 (const AVMasteringDisplayMetadata*)side_data;
824 if (metadata->has_primaries) {
825 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
826 av_q2d(metadata->display_primaries[0][0]));
827 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
828 av_q2d(metadata->display_primaries[0][1]));
829 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
830 av_q2d(metadata->display_primaries[1][0]));
831 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
832 av_q2d(metadata->display_primaries[1][1]));
833 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
834 av_q2d(metadata->display_primaries[2][0]));
835 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
836 av_q2d(metadata->display_primaries[2][1]));
837 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
838 av_q2d(metadata->white_point[0]));
839 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
840 av_q2d(metadata->white_point[1]));
842 if (metadata->has_luminance) {
843 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
844 av_q2d(metadata->max_luminance));
845 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
846 av_q2d(metadata->min_luminance));
848 end_ebml_master(dyn_cp, meta_element);
851 colorinfo_size = avio_close_dyn_buf(dyn_cp, &colorinfo_ptr);
852 if (colorinfo_size) {
853 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, 0);
854 avio_write(pb, colorinfo_ptr, colorinfo_size);
855 end_ebml_master(pb, colorinfo);
857 av_free(colorinfo_ptr);
861 static void mkv_write_field_order(AVIOContext *pb, int mode,
862 enum AVFieldOrder field_order)
864 switch (field_order) {
865 case AV_FIELD_UNKNOWN:
866 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
867 MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED);
869 case AV_FIELD_PROGRESSIVE:
870 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
871 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
877 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
878 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
879 if (mode != MODE_WEBM) {
880 switch (field_order) {
882 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
883 MATROSKA_VIDEO_FIELDORDER_TT);
886 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
887 MATROSKA_VIDEO_FIELDORDER_BB);
890 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
891 MATROSKA_VIDEO_FIELDORDER_TB);
894 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
895 MATROSKA_VIDEO_FIELDORDER_BT);
902 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
903 AVStream *st, int mode, int *h_width, int *h_height)
907 AVDictionaryEntry *tag;
908 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
912 // convert metadata into proper side data and add it to the stream
913 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
914 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
915 int stereo_mode = atoi(tag->value);
917 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
918 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
923 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
924 stereo_mode != 10 && stereo_mode != 12) {
925 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
931 // iterate to find the stereo3d side data
932 for (i = 0; i < st->nb_side_data; i++) {
933 AVPacketSideData sd = st->side_data[i];
934 if (sd.type == AV_PKT_DATA_STEREO3D) {
935 AVStereo3D *stereo = (AVStereo3D *)sd.data;
937 switch (stereo->type) {
939 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
941 case AV_STEREO3D_SIDEBYSIDE:
942 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
943 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
944 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
947 case AV_STEREO3D_TOPBOTTOM:
948 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
949 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
953 case AV_STEREO3D_CHECKERBOARD:
954 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
955 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
958 case AV_STEREO3D_LINES:
959 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
960 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
964 case AV_STEREO3D_COLUMNS:
965 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
966 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
970 case AV_STEREO3D_FRAMESEQUENCE:
971 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
972 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
980 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
983 // if webm, do not write unsupported modes
984 if ((mode == MODE_WEBM &&
985 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
986 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
987 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
988 av_log(s, AV_LOG_ERROR,
989 "The specified stereo mode is not valid.\n");
990 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
991 return AVERROR(EINVAL);
994 // write StereoMode if format is valid
995 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1000 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1001 int i, AVIOContext *pb, int default_stream_exists)
1003 AVStream *st = s->streams[i];
1004 AVCodecParameters *par = st->codecpar;
1005 ebml_master subinfo, track;
1008 int bit_depth = av_get_bits_per_sample(par->codec_id);
1009 int sample_rate = par->sample_rate;
1010 int output_sample_rate = 0;
1011 int display_width_div = 1;
1012 int display_height_div = 1;
1014 AVDictionaryEntry *tag;
1016 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1017 mkv->have_attachments = 1;
1021 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
1022 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1023 if (par->bits_per_raw_sample)
1024 bit_depth = par->bits_per_raw_sample;
1026 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1029 bit_depth = par->bits_per_coded_sample;
1032 if (par->codec_id == AV_CODEC_ID_AAC) {
1033 ret = get_aac_sample_rates(s, par, &sample_rate, &output_sample_rate);
1038 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1039 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1040 mkv->is_dash ? mkv->dash_track_number : i + 1);
1041 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1042 mkv->is_dash ? mkv->dash_track_number : i + 1);
1043 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1045 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1046 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1047 tag = av_dict_get(st->metadata, "language", NULL, 0);
1048 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1049 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
1050 } else if (tag && tag->value) {
1051 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
1054 // The default value for TRACKFLAGDEFAULT is 1, so add element
1055 // if we need to clear it.
1056 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1057 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1059 if (st->disposition & AV_DISPOSITION_FORCED)
1060 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1062 if (mkv->mode == MODE_WEBM && par->codec_id == AV_CODEC_ID_WEBVTT) {
1063 const char *codec_id;
1064 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1065 codec_id = "D_WEBVTT/CAPTIONS";
1066 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1067 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1068 codec_id = "D_WEBVTT/DESCRIPTIONS";
1069 native_id = MATROSKA_TRACK_TYPE_METADATA;
1070 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1071 codec_id = "D_WEBVTT/METADATA";
1072 native_id = MATROSKA_TRACK_TYPE_METADATA;
1074 codec_id = "D_WEBVTT/SUBTITLES";
1075 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1077 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1079 // look for a codec ID string specific to mkv to use,
1080 // if none are found, use AVI codes
1081 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1082 if (ff_mkv_codec_tags[j].id == par->codec_id) {
1083 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1088 if (par->codec_id == AV_CODEC_ID_RAWVIDEO && !par->codec_tag) {
1089 if (mkv->allow_raw_vfw) {
1092 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1093 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1094 return AVERROR(EINVAL);
1099 if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1100 int64_t codecdelay = av_rescale_q(par->initial_padding,
1101 (AVRational){ 1, 48000 },
1102 (AVRational){ 1, 1000000000 });
1103 if (codecdelay < 0) {
1104 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1105 return AVERROR(EINVAL);
1107 // mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1108 // (AVRational){ 1, par->sample_rate },
1111 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1113 if (par->codec_id == AV_CODEC_ID_OPUS) {
1114 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1117 if (mkv->mode == MODE_WEBM && !(par->codec_id == AV_CODEC_ID_VP8 ||
1118 par->codec_id == AV_CODEC_ID_VP9 ||
1119 par->codec_id == AV_CODEC_ID_OPUS ||
1120 par->codec_id == AV_CODEC_ID_VORBIS ||
1121 par->codec_id == AV_CODEC_ID_WEBVTT)) {
1122 av_log(s, AV_LOG_ERROR,
1123 "Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1124 return AVERROR(EINVAL);
1127 switch (par->codec_type) {
1128 case AVMEDIA_TYPE_VIDEO:
1129 mkv->have_video = 1;
1130 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1132 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1133 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1134 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1136 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->time_base.num / st->time_base.den);
1139 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1140 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1141 par->codec_id == AV_CODEC_ID_SVQ1 ||
1142 par->codec_id == AV_CODEC_ID_SVQ3 ||
1143 par->codec_id == AV_CODEC_ID_CINEPAK))
1147 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1148 else if (!native_id) {
1149 // if there is no mkv-specific codec ID, use VFW mode
1150 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1151 mkv->tracks[i].write_dts = 1;
1152 s->internal->avoid_negative_ts_use_pts = 0;
1155 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1157 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1158 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1160 mkv_write_field_order(pb, mkv->mode, par->field_order);
1162 // check both side data and metadata for stereo information,
1163 // write the result to the bitstream if any is found
1164 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1166 &display_height_div);
1170 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1171 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1172 (par->format == AV_PIX_FMT_YUVA420P)) {
1173 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1176 // write DisplayWidth and DisplayHeight, they contain the size of
1177 // a single source view and/or the display aspect ratio
1178 if (st->sample_aspect_ratio.num) {
1179 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1180 if (d_width > INT_MAX) {
1181 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1182 return AVERROR(EINVAL);
1184 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1185 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1186 } else if (display_width_div != 1 || display_height_div != 1) {
1187 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1188 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1191 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1192 uint32_t color_space = av_le2ne32(par->codec_tag);
1193 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1195 if (s->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
1196 ret = mkv_write_video_color(pb, par, st);
1200 end_ebml_master(pb, subinfo);
1203 case AVMEDIA_TYPE_AUDIO:
1204 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1207 // no mkv-specific ID, use ACM mode
1208 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1210 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1211 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1212 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1213 if (output_sample_rate)
1214 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1216 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1217 end_ebml_master(pb, subinfo);
1220 case AVMEDIA_TYPE_SUBTITLE:
1222 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1223 return AVERROR(ENOSYS);
1226 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1227 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1229 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1232 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1233 return AVERROR(EINVAL);
1236 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1237 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1242 end_ebml_master(pb, track);
1247 static int mkv_write_tracks(AVFormatContext *s)
1249 MatroskaMuxContext *mkv = s->priv_data;
1250 AVIOContext *dyn_cp, *pb = s->pb;
1252 int i, ret, default_stream_exists = 0;
1254 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1258 ret = start_ebml_master_crc32(pb, &dyn_cp, &tracks, MATROSKA_ID_TRACKS, 0);
1262 for (i = 0; i < s->nb_streams; i++) {
1263 AVStream *st = s->streams[i];
1264 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1266 for (i = 0; i < s->nb_streams; i++) {
1267 ret = mkv_write_track(s, mkv, i, dyn_cp, default_stream_exists);
1271 end_ebml_master_crc32(pb, &dyn_cp, mkv, tracks);
1275 static int mkv_write_chapters(AVFormatContext *s)
1277 MatroskaMuxContext *mkv = s->priv_data;
1278 AVIOContext *dyn_cp, *pb = s->pb;
1279 ebml_master chapters, editionentry;
1280 AVRational scale = {1, 1E9};
1283 if (!s->nb_chapters || mkv->wrote_chapters)
1286 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1287 if (ret < 0) return ret;
1289 ret = start_ebml_master_crc32(pb, &dyn_cp, &chapters, MATROSKA_ID_CHAPTERS, 0);
1290 if (ret < 0) return ret;
1292 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1293 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1294 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1295 for (i = 0; i < s->nb_chapters; i++) {
1296 ebml_master chapteratom, chapterdisplay;
1297 AVChapter *c = s->chapters[i];
1298 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1299 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1300 AVDictionaryEntry *t = NULL;
1301 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1302 av_log(s, AV_LOG_ERROR,
1303 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1304 chapterstart, chapterend);
1305 return AVERROR_INVALIDDATA;
1308 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1309 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1310 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1311 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1312 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1313 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1314 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1315 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1316 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1317 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1318 end_ebml_master(dyn_cp, chapterdisplay);
1320 end_ebml_master(dyn_cp, chapteratom);
1322 end_ebml_master(dyn_cp, editionentry);
1323 end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
1325 mkv->wrote_chapters = 1;
1329 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1331 uint8_t *key = av_strdup(t->key);
1333 const uint8_t *lang = NULL;
1337 return AVERROR(ENOMEM);
1339 if ((p = strrchr(p, '-')) &&
1340 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1347 else if (*p >= 'a' && *p <= 'z')
1352 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1353 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1355 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1356 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1357 end_ebml_master(pb, tag);
1363 static int mkv_write_tag_targets(AVFormatContext *s,
1364 unsigned int elementid, unsigned int uid,
1365 ebml_master *tags, ebml_master* tag)
1368 MatroskaMuxContext *mkv = s->priv_data;
1369 ebml_master targets;
1373 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1374 if (ret < 0) return ret;
1376 start_ebml_master_crc32(s->pb, &mkv->tags_bc, tags, MATROSKA_ID_TAGS, 0);
1380 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1381 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1383 put_ebml_uint(pb, elementid, uid);
1384 end_ebml_master(pb, targets);
1388 static int mkv_check_tag_name(const char *name, unsigned int elementid)
1390 return av_strcasecmp(name, "title") &&
1391 av_strcasecmp(name, "stereo_mode") &&
1392 av_strcasecmp(name, "creation_time") &&
1393 av_strcasecmp(name, "encoding_tool") &&
1394 av_strcasecmp(name, "duration") &&
1395 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1396 av_strcasecmp(name, "language"));
1399 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1400 unsigned int uid, ebml_master *tags)
1402 MatroskaMuxContext *mkv = s->priv_data;
1405 AVDictionaryEntry *t = NULL;
1407 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1411 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1412 if (mkv_check_tag_name(t->key, elementid)) {
1413 ret = mkv_write_simpletag(mkv->tags_bc, t);
1419 end_ebml_master(mkv->tags_bc, tag);
1423 static int mkv_check_tag(AVDictionary *m, unsigned int elementid)
1425 AVDictionaryEntry *t = NULL;
1427 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1428 if (mkv_check_tag_name(t->key, elementid))
1434 static int mkv_write_tags(AVFormatContext *s)
1436 MatroskaMuxContext *mkv = s->priv_data;
1439 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1441 if (mkv_check_tag(s->metadata, 0)) {
1442 ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
1443 if (ret < 0) return ret;
1446 for (i = 0; i < s->nb_streams; i++) {
1447 AVStream *st = s->streams[i];
1449 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1452 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
1453 if (ret < 0) return ret;
1456 if (s->pb->seekable && !mkv->is_live) {
1457 for (i = 0; i < s->nb_streams; i++) {
1459 ebml_master tag_target;
1462 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
1465 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1466 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1467 mkv->stream_duration_offsets[i] = avio_tell(pb);
1469 // Reserve space to write duration as a 20-byte string.
1470 // 2 (ebml id) + 1 (data size) + 20 (data)
1471 put_ebml_void(pb, 23);
1472 end_ebml_master(pb, tag);
1473 end_ebml_master(pb, tag_target);
1477 for (i = 0; i < s->nb_chapters; i++) {
1478 AVChapter *ch = s->chapters[i];
1480 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1483 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
1484 if (ret < 0) return ret;
1487 if (mkv->tags.pos) {
1488 if (s->pb->seekable && !mkv->is_live)
1489 put_ebml_void(s->pb, avio_tell(mkv->tags_bc) + ((mkv->write_crc && mkv->mode != MODE_WEBM) ? 2 /* ebml id + data size */ + 4 /* CRC32 */ : 0));
1491 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1496 static int mkv_write_attachments(AVFormatContext *s)
1498 MatroskaMuxContext *mkv = s->priv_data;
1499 AVIOContext *dyn_cp, *pb = s->pb;
1500 ebml_master attachments;
1504 if (!mkv->have_attachments)
1507 av_lfg_init(&c, av_get_random_seed());
1509 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1510 if (ret < 0) return ret;
1512 ret = start_ebml_master_crc32(pb, &dyn_cp, &attachments, MATROSKA_ID_ATTACHMENTS, 0);
1513 if (ret < 0) return ret;
1515 for (i = 0; i < s->nb_streams; i++) {
1516 AVStream *st = s->streams[i];
1517 ebml_master attached_file;
1518 AVDictionaryEntry *t;
1519 const char *mimetype = NULL;
1522 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1525 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1527 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1528 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1529 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1530 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1531 return AVERROR(EINVAL);
1533 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1534 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1535 mimetype = t->value;
1536 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1538 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1539 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1540 mimetype = ff_mkv_mime_tags[i].str;
1543 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1544 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1545 mimetype = ff_mkv_image_mime_tags[i].str;
1550 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1551 "it cannot be deduced from the codec id.\n", i);
1552 return AVERROR(EINVAL);
1555 if (s->flags & AVFMT_FLAG_BITEXACT) {
1556 struct AVSHA *sha = av_sha_alloc();
1559 return AVERROR(ENOMEM);
1560 av_sha_init(sha, 160);
1561 av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1562 av_sha_final(sha, digest);
1564 fileuid = AV_RL64(digest);
1566 fileuid = av_lfg_get(&c);
1568 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1571 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1572 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1573 put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1574 end_ebml_master(dyn_cp, attached_file);
1576 end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
1581 static int64_t get_metadata_duration(AVFormatContext *s)
1587 AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1588 if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1589 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1593 for (i = 0; i < s->nb_streams; i++) {
1595 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1597 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1598 max = FFMAX(max, us);
1601 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1605 static int mkv_write_header(AVFormatContext *s)
1607 MatroskaMuxContext *mkv = s->priv_data;
1608 AVIOContext *pb = s->pb;
1609 ebml_master ebml_header;
1610 AVDictionaryEntry *tag;
1611 int ret, i, version = 2;
1612 int64_t creation_time;
1614 if (!strcmp(s->oformat->name, "webm"))
1615 mkv->mode = MODE_WEBM;
1617 mkv->mode = MODE_MATROSKAv2;
1619 if (mkv->mode != MODE_WEBM ||
1620 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1621 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1624 for (i = 0; i < s->nb_streams; i++) {
1625 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
1626 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
1627 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
1628 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
1629 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
1630 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
1631 av_log(s, AV_LOG_ERROR,
1632 "The Matroska muxer does not yet support muxing %s\n",
1633 avcodec_get_name(s->streams[i]->codecpar->codec_id));
1634 return AVERROR_PATCHWELCOME;
1636 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1637 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1638 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1642 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1644 ret = AVERROR(ENOMEM);
1647 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1648 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1649 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1650 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1651 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1652 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1653 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1654 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1655 end_ebml_master(pb, ebml_header);
1657 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1658 mkv->segment_offset = avio_tell(pb);
1660 // we write 2 seek heads - one at the end of the file to point to each
1661 // cluster, and one at the beginning to point to all other level one
1662 // elements (including the seek head at the end of the file), which
1663 // isn't more than 10 elements if we only write one of each other
1664 // currently defined level 1 element
1665 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1666 if (!mkv->main_seekhead) {
1667 ret = AVERROR(ENOMEM);
1671 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1672 if (ret < 0) goto fail;
1674 ret = start_ebml_master_crc32(pb, &mkv->info_bc, &mkv->info, MATROSKA_ID_INFO, 0);
1679 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1680 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1681 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1682 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1683 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1684 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1685 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1687 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1689 if (mkv->mode != MODE_WEBM) {
1690 uint32_t segment_uid[4];
1693 av_lfg_init(&lfg, av_get_random_seed());
1695 for (i = 0; i < 4; i++)
1696 segment_uid[i] = av_lfg_get(&lfg);
1698 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1701 const char *ident = "Lavf";
1702 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1703 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1706 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1707 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1708 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1709 uint8_t date_utc_buf[8];
1710 AV_WB64(date_utc_buf, date_utc);
1711 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1714 // reserve space for the duration
1716 mkv->duration_offset = avio_tell(pb);
1717 if (!mkv->is_live) {
1718 int64_t metadata_duration = get_metadata_duration(s);
1720 if (s->duration > 0) {
1721 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1722 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1723 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1724 } else if (metadata_duration > 0) {
1725 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1726 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1727 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1729 put_ebml_void(pb, 11); // assumes double-precision float to be written
1732 if (s->pb->seekable)
1733 put_ebml_void(s->pb, avio_tell(pb) + ((mkv->write_crc && mkv->mode != MODE_WEBM) ? 2 /* ebml id + data size */ + 4 /* CRC32 */ : 0));
1735 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
1738 // initialize stream_duration fields
1739 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1740 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1742 ret = mkv_write_tracks(s);
1746 for (i = 0; i < s->nb_chapters; i++)
1747 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1749 if (mkv->mode != MODE_WEBM) {
1750 ret = mkv_write_chapters(s);
1754 ret = mkv_write_tags(s);
1758 ret = mkv_write_attachments(s);
1763 if (!s->pb->seekable && !mkv->is_live)
1764 mkv_write_seekhead(pb, mkv);
1766 mkv->cues = mkv_start_cues(mkv->segment_offset);
1768 ret = AVERROR(ENOMEM);
1771 if (pb->seekable && mkv->reserve_cues_space) {
1772 mkv->cues_pos = avio_tell(pb);
1773 put_ebml_void(pb, mkv->reserve_cues_space);
1776 av_init_packet(&mkv->cur_audio_pkt);
1777 mkv->cur_audio_pkt.size = 0;
1778 mkv->cluster_pos = -1;
1782 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1783 // after 4k and on a keyframe
1785 if (mkv->cluster_time_limit < 0)
1786 mkv->cluster_time_limit = 5000;
1787 if (mkv->cluster_size_limit < 0)
1788 mkv->cluster_size_limit = 5 * 1024 * 1024;
1790 if (mkv->cluster_time_limit < 0)
1791 mkv->cluster_time_limit = 1000;
1792 if (mkv->cluster_size_limit < 0)
1793 mkv->cluster_size_limit = 32 * 1024;
1802 static int mkv_blockgroup_size(int pkt_size)
1804 int size = pkt_size + 4;
1805 size += ebml_num_size(size);
1806 size += 2; // EBML ID for block and block duration
1807 size += 8; // max size of block duration
1808 size += ebml_num_size(size);
1809 size += 1; // blockgroup EBML ID
1813 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1820 dst = av_malloc(srclen);
1822 return AVERROR(ENOMEM);
1824 while (srclen >= WV_HEADER_SIZE) {
1827 ret = ff_wv_parse_header(&header, src);
1830 src += WV_HEADER_SIZE;
1831 srclen -= WV_HEADER_SIZE;
1833 if (srclen < header.blocksize) {
1834 ret = AVERROR_INVALIDDATA;
1838 if (header.initial) {
1839 AV_WL32(dst + offset, header.samples);
1842 AV_WL32(dst + offset, header.flags);
1843 AV_WL32(dst + offset + 4, header.crc);
1846 if (!(header.initial && header.final)) {
1847 AV_WL32(dst + offset, header.blocksize);
1851 memcpy(dst + offset, src, header.blocksize);
1852 src += header.blocksize;
1853 srclen -= header.blocksize;
1854 offset += header.blocksize;
1866 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1867 unsigned int blockid, AVPacket *pkt, int keyframe)
1869 MatroskaMuxContext *mkv = s->priv_data;
1870 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
1871 uint8_t *data = NULL, *side_data = NULL;
1872 int offset = 0, size = pkt->size, side_data_size = 0;
1873 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1874 uint64_t additional_id = 0;
1875 int64_t discard_padding = 0;
1876 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
1877 ebml_master block_group, block_additions, block_more;
1879 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1880 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
1881 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
1883 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
1884 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1885 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1886 else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
1887 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1888 /* extradata is Annex B, assume the bitstream is too and convert it */
1889 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1890 else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
1891 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1893 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1899 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
1900 /* Matroska specification requires to remove the first QuickTime atom
1906 side_data = av_packet_get_side_data(pkt,
1907 AV_PKT_DATA_SKIP_SAMPLES,
1910 if (side_data && side_data_size >= 10) {
1911 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1912 (AVRational){1, par->sample_rate},
1913 (AVRational){1, 1000000000});
1916 side_data = av_packet_get_side_data(pkt,
1917 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1920 additional_id = AV_RB64(side_data);
1922 side_data_size -= 8;
1925 if ((side_data_size && additional_id == 1) || discard_padding) {
1926 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1927 blockid = MATROSKA_ID_BLOCK;
1930 put_ebml_id(pb, blockid);
1931 put_ebml_num(pb, size + 4, 0);
1932 // this assumes stream_index is less than 126
1933 avio_w8(pb, 0x80 | track_number);
1934 avio_wb16(pb, ts - mkv->cluster_pts);
1935 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
1936 avio_write(pb, data + offset, size);
1937 if (data != pkt->data)
1940 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
1941 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
1942 mkv->last_track_timestamp[track_number - 1]);
1944 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
1946 if (discard_padding) {
1947 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1950 if (side_data_size && additional_id == 1) {
1951 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1952 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1953 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1954 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1955 put_ebml_num(pb, side_data_size, 0);
1956 avio_write(pb, side_data, side_data_size);
1957 end_ebml_master(pb, block_more);
1958 end_ebml_master(pb, block_additions);
1960 if ((side_data_size && additional_id == 1) || discard_padding) {
1961 end_ebml_master(pb, block_group);
1965 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1967 MatroskaMuxContext *mkv = s->priv_data;
1968 ebml_master blockgroup;
1969 int id_size, settings_size, size;
1970 uint8_t *id, *settings;
1971 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1972 const int flags = 0;
1975 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1979 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1982 size = id_size + 1 + settings_size + 1 + pkt->size;
1984 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1985 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
1986 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1988 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1990 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1991 put_ebml_num(pb, size + 4, 0);
1992 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1993 avio_wb16(pb, ts - mkv->cluster_pts);
1995 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1997 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1998 end_ebml_master(pb, blockgroup);
2000 return pkt->duration;
2003 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
2005 MatroskaMuxContext *mkv = s->priv_data;
2007 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2008 mkv->cluster_pos = -1;
2009 if (s->pb->seekable)
2010 av_log(s, AV_LOG_DEBUG,
2011 "Starting new cluster at offset %" PRIu64 " bytes, "
2012 "pts %" PRIu64 "dts %" PRIu64 "\n",
2013 avio_tell(s->pb), pkt->pts, pkt->dts);
2015 av_log(s, AV_LOG_DEBUG, "Starting new cluster, "
2016 "pts %" PRIu64 "dts %" PRIu64 "\n",
2017 pkt->pts, pkt->dts);
2021 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2023 MatroskaMuxContext *mkv = s->priv_data;
2024 AVIOContext *pb = s->pb;
2025 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2026 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2027 int duration = pkt->duration;
2029 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2030 int64_t relative_packet_pos;
2031 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
2033 if (ts == AV_NOPTS_VALUE) {
2034 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2035 return AVERROR(EINVAL);
2037 ts += mkv->tracks[pkt->stream_index].ts_offset;
2039 if (mkv->cluster_pos != -1) {
2040 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
2041 if ((int16_t)cluster_time != cluster_time) {
2042 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2043 mkv_start_new_cluster(s, pkt);
2047 if (mkv->cluster_pos == -1) {
2048 mkv->cluster_pos = avio_tell(s->pb);
2049 ret = start_ebml_master_crc32(s->pb, &mkv->dyn_bc, &mkv->cluster, MATROSKA_ID_CLUSTER, 0);
2052 put_ebml_uint(mkv->dyn_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2053 mkv->cluster_pts = FFMAX(0, ts);
2057 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos + avio_tell(pb);
2059 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2060 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2061 if (s->pb->seekable && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2062 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
2063 if (ret < 0) return ret;
2066 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2067 duration = mkv_write_vtt_blocks(s, pb, pkt);
2069 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2070 mkv_blockgroup_size(pkt->size));
2072 #if FF_API_CONVERGENCE_DURATION
2073 FF_DISABLE_DEPRECATION_WARNINGS
2074 /* For backward compatibility, prefer convergence_duration. */
2075 if (pkt->convergence_duration > 0) {
2076 duration = pkt->convergence_duration;
2078 FF_ENABLE_DEPRECATION_WARNINGS
2080 /* All subtitle blocks are considered to be keyframes. */
2081 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2082 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2083 end_ebml_master(pb, blockgroup);
2086 if (s->pb->seekable) {
2087 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
2088 mkv->cluster_pos, relative_packet_pos, duration);
2094 mkv->duration = FFMAX(mkv->duration, ts + duration);
2096 if (mkv->stream_durations)
2097 mkv->stream_durations[pkt->stream_index] =
2098 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
2103 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2105 MatroskaMuxContext *mkv = s->priv_data;
2106 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2107 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2109 int64_t cluster_time;
2111 int start_new_cluster;
2113 if (mkv->tracks[pkt->stream_index].write_dts)
2114 cluster_time = pkt->dts - mkv->cluster_pts;
2116 cluster_time = pkt->pts - mkv->cluster_pts;
2117 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2119 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2120 // after 4k and on a keyframe
2121 cluster_size = avio_tell(mkv->dyn_bc);
2123 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2124 // WebM DASH specification states that the first block of every cluster
2125 // has to be a key frame. So for DASH video, we only create a cluster
2126 // on seeing key frames.
2127 start_new_cluster = keyframe;
2128 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2129 (mkv->cluster_pos == -1 ||
2130 cluster_time > mkv->cluster_time_limit)) {
2131 // For DASH audio, we create a Cluster based on cluster_time_limit
2132 start_new_cluster = 1;
2133 } else if (!mkv->is_dash &&
2134 (cluster_size > mkv->cluster_size_limit ||
2135 cluster_time > mkv->cluster_time_limit ||
2136 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2137 cluster_size > 4 * 1024))) {
2138 start_new_cluster = 1;
2140 start_new_cluster = 0;
2143 if (mkv->cluster_pos != -1 && start_new_cluster) {
2144 mkv_start_new_cluster(s, pkt);
2147 if (!mkv->cluster_pos)
2148 avio_write_marker(s->pb,
2149 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2150 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2152 // check if we have an audio packet cached
2153 if (mkv->cur_audio_pkt.size > 0) {
2154 // for DASH audio, a CuePoint has to be added when there is a new cluster.
2155 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2156 mkv->is_dash ? start_new_cluster : 0);
2157 av_packet_unref(&mkv->cur_audio_pkt);
2159 av_log(s, AV_LOG_ERROR,
2160 "Could not write cached audio packet ret:%d\n", ret);
2165 // buffer an audio packet to ensure the packet containing the video
2166 // keyframe's timecode is contained in the same cluster for WebM
2167 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2168 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2170 ret = mkv_write_packet_internal(s, pkt, 0);
2174 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2176 MatroskaMuxContext *mkv = s->priv_data;
2179 if (mkv->cluster_pos != -1) {
2180 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2181 mkv->cluster_pos = -1;
2182 if (s->pb->seekable)
2183 av_log(s, AV_LOG_DEBUG,
2184 "Flushing cluster at offset %" PRIu64 " bytes\n",
2187 av_log(s, AV_LOG_DEBUG, "Flushing cluster\n");
2192 return mkv_write_packet(s, pkt);
2195 static int mkv_write_trailer(AVFormatContext *s)
2197 MatroskaMuxContext *mkv = s->priv_data;
2198 AVIOContext *pb = s->pb;
2199 int64_t currentpos, cuespos;
2202 // check if we have an audio packet cached
2203 if (mkv->cur_audio_pkt.size > 0) {
2204 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2205 av_packet_unref(&mkv->cur_audio_pkt);
2207 av_log(s, AV_LOG_ERROR,
2208 "Could not write cached audio packet ret:%d\n", ret);
2214 end_ebml_master_crc32(pb, &mkv->dyn_bc, mkv, mkv->cluster);
2217 if (mkv->mode != MODE_WEBM) {
2218 ret = mkv_write_chapters(s);
2224 if (mkv->cues->num_entries) {
2225 if (mkv->reserve_cues_space) {
2228 currentpos = avio_tell(pb);
2229 avio_seek(pb, mkv->cues_pos, SEEK_SET);
2231 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2232 cues_end = avio_tell(pb);
2233 if (cues_end > cuespos + mkv->reserve_cues_space) {
2234 av_log(s, AV_LOG_ERROR,
2235 "Insufficient space reserved for cues: %d "
2236 "(needed: %" PRId64 ").\n",
2237 mkv->reserve_cues_space, cues_end - cuespos);
2238 return AVERROR(EINVAL);
2241 if (cues_end < cuespos + mkv->reserve_cues_space)
2242 put_ebml_void(pb, mkv->reserve_cues_space -
2243 (cues_end - cuespos));
2245 avio_seek(pb, currentpos, SEEK_SET);
2247 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2250 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2256 mkv_write_seekhead(pb, mkv);
2258 // update the duration
2259 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2260 currentpos = avio_tell(pb);
2261 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2262 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2263 avio_seek(pb, mkv->info.pos, SEEK_SET);
2264 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
2266 // update stream durations
2267 if (mkv->stream_durations) {
2269 for (i = 0; i < s->nb_streams; ++i) {
2270 AVStream *st = s->streams[i];
2271 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2272 char duration_string[20] = "";
2274 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2275 mkv->stream_durations[i]);
2277 if (!mkv->is_live && mkv->stream_duration_offsets[i] > 0) {
2278 avio_seek(mkv->tags_bc, mkv->stream_duration_offsets[i], SEEK_SET);
2280 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2281 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2282 fmod(duration_sec, 60));
2284 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2288 if (mkv->tags.pos && !mkv->is_live) {
2289 avio_seek(pb, mkv->tags.pos, SEEK_SET);
2290 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
2293 avio_seek(pb, currentpos, SEEK_SET);
2296 if (!mkv->is_live) {
2297 end_ebml_master(pb, mkv->segment);
2304 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2307 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2308 if (ff_mkv_codec_tags[i].id == codec_id)
2311 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2312 enum AVMediaType type = avcodec_get_type(codec_id);
2313 // mkv theoretically supports any video/audio through VFW/ACM
2314 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2321 static int mkv_init(struct AVFormatContext *s)
2325 if (s->avoid_negative_ts < 0) {
2326 s->avoid_negative_ts = 1;
2327 s->internal->avoid_negative_ts_use_pts = 1;
2330 for (i = 0; i < s->nb_streams; i++) {
2331 // ms precision is the de-facto standard timescale for mkv files
2332 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2338 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2341 AVStream *st = s->streams[pkt->stream_index];
2343 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2344 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2345 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2346 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2347 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2353 static const AVCodecTag additional_audio_tags[] = {
2354 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2355 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
2356 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2357 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2358 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2359 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2360 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2361 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2362 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2363 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2364 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2365 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2366 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2369 static const AVCodecTag additional_video_tags[] = {
2370 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2371 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2372 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2373 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
2374 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
2375 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2378 static const AVCodecTag additional_subtitle_tags[] = {
2379 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2380 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2381 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2384 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2385 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2386 static const AVOption options[] = {
2387 { "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 },
2388 { "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 },
2389 { "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 },
2390 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2391 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2392 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2393 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2394 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2398 #if CONFIG_MATROSKA_MUXER
2399 static const AVClass matroska_class = {
2400 .class_name = "matroska muxer",
2401 .item_name = av_default_item_name,
2403 .version = LIBAVUTIL_VERSION_INT,
2406 AVOutputFormat ff_matroska_muxer = {
2408 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2409 .mime_type = "video/x-matroska",
2410 .extensions = "mkv",
2411 .priv_data_size = sizeof(MatroskaMuxContext),
2412 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2413 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2414 .video_codec = CONFIG_LIBX264_ENCODER ?
2415 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2417 .write_header = mkv_write_header,
2418 .write_packet = mkv_write_flush_packet,
2419 .write_trailer = mkv_write_trailer,
2420 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2421 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2422 .codec_tag = (const AVCodecTag* const []){
2423 ff_codec_bmp_tags, ff_codec_wav_tags,
2424 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2426 .subtitle_codec = AV_CODEC_ID_ASS,
2427 .query_codec = mkv_query_codec,
2428 .check_bitstream = mkv_check_bitstream,
2429 .priv_class = &matroska_class,
2433 #if CONFIG_WEBM_MUXER
2434 static const AVClass webm_class = {
2435 .class_name = "webm muxer",
2436 .item_name = av_default_item_name,
2438 .version = LIBAVUTIL_VERSION_INT,
2441 AVOutputFormat ff_webm_muxer = {
2443 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2444 .mime_type = "video/webm",
2445 .extensions = "webm",
2446 .priv_data_size = sizeof(MatroskaMuxContext),
2447 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2448 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2449 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2451 .write_header = mkv_write_header,
2452 .write_packet = mkv_write_flush_packet,
2453 .write_trailer = mkv_write_trailer,
2454 .check_bitstream = mkv_check_bitstream,
2455 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2456 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2457 .priv_class = &webm_class,
2461 #if CONFIG_MATROSKA_AUDIO_MUXER
2462 static const AVClass mka_class = {
2463 .class_name = "matroska audio muxer",
2464 .item_name = av_default_item_name,
2466 .version = LIBAVUTIL_VERSION_INT,
2468 AVOutputFormat ff_matroska_audio_muxer = {
2470 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2471 .mime_type = "audio/x-matroska",
2472 .extensions = "mka",
2473 .priv_data_size = sizeof(MatroskaMuxContext),
2474 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2475 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2476 .video_codec = AV_CODEC_ID_NONE,
2478 .write_header = mkv_write_header,
2479 .write_packet = mkv_write_flush_packet,
2480 .write_trailer = mkv_write_trailer,
2481 .check_bitstream = mkv_check_bitstream,
2482 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2484 .codec_tag = (const AVCodecTag* const []){
2485 ff_codec_wav_tags, additional_audio_tags, 0
2487 .priv_class = &mka_class,