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 typedef struct mkv_attachment {
104 typedef struct mkv_attachments {
105 mkv_attachment *entries;
109 #define MODE_MATROSKAv2 0x01
110 #define MODE_WEBM 0x02
112 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
113 * range 1 to 126 (inclusive) */
114 #define MAX_TRACKS 126
116 typedef struct MatroskaMuxContext {
117 const AVClass *class;
120 AVIOContext *tags_bc;
122 AVIOContext *info_bc;
125 int64_t segment_offset;
127 int64_t cluster_pos; ///< file offset of the current cluster
129 int64_t duration_offset;
131 mkv_seekhead *main_seekhead;
134 mkv_attachments *attachments;
136 AVPacket cur_audio_pkt;
138 int have_attachments;
141 int reserve_cues_space;
142 int cluster_size_limit;
144 int64_t cluster_time_limit;
146 int dash_track_number;
150 uint32_t chapter_id_offset;
153 int64_t last_track_timestamp[MAX_TRACKS];
155 int64_t* stream_durations;
156 int64_t* stream_duration_offsets;
159 } MatroskaMuxContext;
162 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
163 * offset, 4 bytes for target EBML ID */
164 #define MAX_SEEKENTRY_SIZE 21
166 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
168 #define MAX_CUETRACKPOS_SIZE 42
170 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
171 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
173 /** Seek preroll value for opus */
174 #define OPUS_SEEK_PREROLL 80000000
176 static int ebml_id_size(unsigned int id)
178 return (av_log2(id + 1) - 1) / 7 + 1;
181 static void put_ebml_id(AVIOContext *pb, unsigned int id)
183 int i = ebml_id_size(id);
185 avio_w8(pb, (uint8_t)(id >> (i * 8)));
189 * Write an EBML size meaning "unknown size".
191 * @param bytes The number of bytes the size should occupy (maximum: 8).
193 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
195 av_assert0(bytes <= 8);
196 avio_w8(pb, 0x1ff >> bytes);
197 ffio_fill(pb, 0xff, bytes - 1);
201 * Calculate how many bytes are needed to represent a given number in EBML.
203 static int ebml_num_size(uint64_t num)
206 while ((num + 1) >> bytes * 7)
212 * Write a number in EBML variable length format.
214 * @param bytes The number of bytes that need to be used to write the number.
215 * If zero, any number of bytes can be used.
217 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
219 int i, needed_bytes = ebml_num_size(num);
221 // sizes larger than this are currently undefined in EBML
222 av_assert0(num < (1ULL << 56) - 1);
225 // don't care how many bytes are used, so use the min
226 bytes = needed_bytes;
227 // the bytes needed to write the given size would exceed the bytes
228 // that we need to use, so write unknown size. This shouldn't happen.
229 av_assert0(bytes >= needed_bytes);
231 num |= 1ULL << bytes * 7;
232 for (i = bytes - 1; i >= 0; i--)
233 avio_w8(pb, (uint8_t)(num >> i * 8));
236 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
243 put_ebml_id(pb, elementid);
244 put_ebml_num(pb, bytes, 0);
245 for (i = bytes - 1; i >= 0; i--)
246 avio_w8(pb, (uint8_t)(val >> i * 8));
249 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
252 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
254 while (tmp>>=8) bytes++;
256 put_ebml_id(pb, elementid);
257 put_ebml_num(pb, bytes, 0);
258 for (i = bytes - 1; i >= 0; i--)
259 avio_w8(pb, (uint8_t)(val >> i * 8));
262 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
264 put_ebml_id(pb, elementid);
265 put_ebml_num(pb, 8, 0);
266 avio_wb64(pb, av_double2int(val));
269 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
270 const void *buf, int size)
272 put_ebml_id(pb, elementid);
273 put_ebml_num(pb, size, 0);
274 avio_write(pb, buf, size);
277 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
280 put_ebml_binary(pb, elementid, str, strlen(str));
284 * Write a void element of a given size. Useful for reserving space in
285 * the file to be written to later.
287 * @param size The number of bytes to reserve, which must be at least 2.
289 static void put_ebml_void(AVIOContext *pb, uint64_t size)
291 int64_t currentpos = avio_tell(pb);
293 av_assert0(size >= 2);
295 put_ebml_id(pb, EBML_ID_VOID);
296 // we need to subtract the length needed to store the size from the
297 // size we need to reserve so 2 cases, we use 8 bytes to store the
298 // size if possible, 1 byte otherwise
300 put_ebml_num(pb, size - 2, 0);
302 put_ebml_num(pb, size - 9, 8);
303 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
306 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
307 uint64_t expectedsize)
309 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
310 put_ebml_id(pb, elementid);
311 put_ebml_size_unknown(pb, bytes);
312 return (ebml_master) {avio_tell(pb), bytes };
315 static void end_ebml_master(AVIOContext *pb, ebml_master master)
317 int64_t pos = avio_tell(pb);
319 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
321 put_ebml_num(pb, pos - master.pos, master.sizebytes);
322 avio_seek(pb, pos, SEEK_SET);
325 static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, ebml_master *master,
326 unsigned int elementid, uint64_t expectedsize)
330 if ((ret = avio_open_dyn_buf(dyn_cp)) < 0)
334 *master = start_ebml_master(pb, elementid, expectedsize);
336 *master = start_ebml_master(*dyn_cp, elementid, expectedsize);
341 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
344 uint8_t *buf, crc[4];
348 size = avio_close_dyn_buf(*dyn_cp, &buf);
349 if (mkv->write_crc && mkv->mode != MODE_WEBM) {
350 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf, size) ^ UINT32_MAX);
351 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
353 avio_write(pb, buf, size);
354 end_ebml_master(pb, master);
356 end_ebml_master(*dyn_cp, master);
357 size = avio_close_dyn_buf(*dyn_cp, &buf);
358 avio_write(pb, buf, size);
364 static void put_xiph_size(AVIOContext *pb, int size)
366 ffio_fill(pb, 255, size / 255);
367 avio_w8(pb, size % 255);
371 * Free the members allocated in the mux context.
373 static void mkv_free(MatroskaMuxContext *mkv) {
374 if (mkv->main_seekhead) {
375 av_freep(&mkv->main_seekhead->entries);
376 av_freep(&mkv->main_seekhead);
379 av_freep(&mkv->cues->entries);
380 av_freep(&mkv->cues);
382 if (mkv->attachments) {
383 av_freep(&mkv->attachments->entries);
384 av_freep(&mkv->attachments);
386 av_freep(&mkv->tracks);
387 av_freep(&mkv->stream_durations);
388 av_freep(&mkv->stream_duration_offsets);
392 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
393 * elements. If a maximum number of elements is specified, enough space
394 * will be reserved at the current file location to write a seek head of
397 * @param segment_offset The absolute offset to the position in the file
398 * where the segment begins.
399 * @param numelements The maximum number of elements that will be indexed
400 * by this seek head, 0 if unlimited.
402 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
405 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
409 new_seekhead->segment_offset = segment_offset;
411 if (numelements > 0) {
412 new_seekhead->filepos = avio_tell(pb);
413 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
414 // and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
415 // that an EBML void element will fit afterwards
416 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
417 new_seekhead->max_entries = numelements;
418 put_ebml_void(pb, new_seekhead->reserved_size);
423 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
425 mkv_seekhead_entry *entries = seekhead->entries;
427 // don't store more elements than we reserved space for
428 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
431 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
433 return AVERROR(ENOMEM);
434 seekhead->entries = entries;
436 seekhead->entries[seekhead->num_entries].elementid = elementid;
437 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
443 * Write the seek head to the file and free it. If a maximum number of
444 * elements was specified to mkv_start_seekhead(), the seek head will
445 * be written at the location reserved for it. Otherwise, it is written
446 * at the current location in the file.
448 * @return The file offset where the seekhead was written,
449 * -1 if an error occurred.
451 static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
454 mkv_seekhead *seekhead = mkv->main_seekhead;
455 ebml_master metaseek, seekentry;
459 currentpos = avio_tell(pb);
461 if (seekhead->reserved_size > 0) {
462 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
468 if (start_ebml_master_crc32(pb, &dyn_cp, &metaseek, MATROSKA_ID_SEEKHEAD,
469 seekhead->reserved_size) < 0) {
474 for (i = 0; i < seekhead->num_entries; i++) {
475 mkv_seekhead_entry *entry = &seekhead->entries[i];
477 seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
479 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
480 put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
481 put_ebml_id(dyn_cp, entry->elementid);
483 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
484 end_ebml_master(dyn_cp, seekentry);
486 end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
488 if (seekhead->reserved_size > 0) {
489 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
490 put_ebml_void(pb, remaining);
491 avio_seek(pb, currentpos, SEEK_SET);
493 currentpos = seekhead->filepos;
496 av_freep(&mkv->main_seekhead->entries);
497 av_freep(&mkv->main_seekhead);
502 static mkv_cues *mkv_start_cues(int64_t segment_offset)
504 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
508 cues->segment_offset = segment_offset;
512 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
513 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
515 mkv_cuepoint *entries = cues->entries;
520 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
522 return AVERROR(ENOMEM);
523 cues->entries = entries;
525 cues->entries[cues->num_entries].pts = ts;
526 cues->entries[cues->num_entries].stream_idx = stream;
527 cues->entries[cues->num_entries].tracknum = tracknum;
528 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
529 cues->entries[cues->num_entries].relative_pos = relative_pos;
530 cues->entries[cues->num_entries++].duration = duration;
535 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
537 MatroskaMuxContext *mkv = s->priv_data;
538 AVIOContext *dyn_cp, *pb = s->pb;
539 ebml_master cues_element;
543 currentpos = avio_tell(pb);
544 ret = start_ebml_master_crc32(pb, &dyn_cp, &cues_element, MATROSKA_ID_CUES, 0);
548 for (i = 0; i < cues->num_entries; i++) {
549 ebml_master cuepoint, track_positions;
550 mkv_cuepoint *entry = &cues->entries[i];
551 uint64_t pts = entry->pts;
554 // Calculate the number of entries, so we know the element size
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;
566 cuepoint = start_ebml_master(dyn_cp, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
567 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETIME, pts);
569 // put all the entries from different tracks that have the exact same
570 // timestamp into the same CuePoint
571 for (j = 0; j < num_tracks; j++)
572 tracks[j].has_cue = 0;
573 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
574 int tracknum = entry[j].stream_idx;
575 av_assert0(tracknum>=0 && tracknum<num_tracks);
576 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
578 tracks[tracknum].has_cue = 1;
579 track_positions = start_ebml_master(dyn_cp, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
580 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETRACK , entry[j].tracknum );
581 put_ebml_uint(dyn_cp, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
582 put_ebml_uint(dyn_cp, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
583 if (entry[j].duration != -1)
584 put_ebml_uint(dyn_cp, MATROSKA_ID_CUEDURATION , entry[j].duration);
585 end_ebml_master(dyn_cp, track_positions);
588 end_ebml_master(dyn_cp, cuepoint);
590 end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
595 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
597 const uint8_t *header_start[3];
599 int first_header_size;
602 if (par->codec_id == AV_CODEC_ID_VORBIS)
603 first_header_size = 30;
605 first_header_size = 42;
607 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
608 first_header_size, header_start, header_len) < 0) {
609 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
613 avio_w8(pb, 2); // number packets - 1
614 for (j = 0; j < 2; j++) {
615 put_xiph_size(pb, header_len[j]);
617 for (j = 0; j < 3; j++)
618 avio_write(pb, header_start[j], header_len[j]);
623 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
625 if (par->extradata && par->extradata_size == 2)
626 avio_write(pb, par->extradata, 2);
628 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
632 static int put_flac_codecpriv(AVFormatContext *s,
633 AVIOContext *pb, AVCodecParameters *par)
635 int write_comment = (par->channel_layout &&
636 !(par->channel_layout & ~0x3ffffULL) &&
637 !ff_flac_is_native_layout(par->channel_layout));
638 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
645 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
646 "Lavf" : LIBAVFORMAT_IDENT;
647 AVDictionary *dict = NULL;
648 uint8_t buf[32], *data, *p;
651 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
652 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
654 len = ff_vorbiscomment_length(dict, vendor);
655 if (len >= ((1<<24) - 4))
656 return AVERROR(EINVAL);
658 data = av_malloc(len + 4);
661 return AVERROR(ENOMEM);
665 AV_WB24(data + 1, len);
668 ff_vorbiscomment_write(&p, &dict, vendor);
670 avio_write(pb, data, len + 4);
679 static int get_aac_sample_rates(AVFormatContext *s, AVCodecParameters *par,
680 int *sample_rate, int *output_sample_rate)
682 MPEG4AudioConfig mp4ac;
684 if (avpriv_mpeg4audio_get_config(&mp4ac, par->extradata,
685 par->extradata_size * 8, 1) < 0) {
686 av_log(s, AV_LOG_ERROR,
687 "Error parsing AAC extradata, unable to determine samplerate.\n");
688 return AVERROR(EINVAL);
691 *sample_rate = mp4ac.sample_rate;
692 *output_sample_rate = mp4ac.ext_sample_rate;
696 static int mkv_write_native_codecprivate(AVFormatContext *s,
697 AVCodecParameters *par,
700 switch (par->codec_id) {
701 case AV_CODEC_ID_VORBIS:
702 case AV_CODEC_ID_THEORA:
703 return put_xiph_codecpriv(s, dyn_cp, par);
704 case AV_CODEC_ID_FLAC:
705 return put_flac_codecpriv(s, dyn_cp, par);
706 case AV_CODEC_ID_WAVPACK:
707 return put_wv_codecpriv(dyn_cp, par);
708 case AV_CODEC_ID_H264:
709 return ff_isom_write_avcc(dyn_cp, par->extradata,
710 par->extradata_size);
711 case AV_CODEC_ID_HEVC:
712 ff_isom_write_hvcc(dyn_cp, par->extradata,
713 par->extradata_size, 0);
715 case AV_CODEC_ID_ALAC:
716 if (par->extradata_size < 36) {
717 av_log(s, AV_LOG_ERROR,
718 "Invalid extradata found, ALAC expects a 36-byte "
720 return AVERROR_INVALIDDATA;
722 avio_write(dyn_cp, par->extradata + 12,
723 par->extradata_size - 12);
726 if (par->codec_id == AV_CODEC_ID_PRORES &&
727 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
728 avio_wl32(dyn_cp, par->codec_tag);
729 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
730 avio_write(dyn_cp, par->extradata, par->extradata_size);
736 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
737 AVCodecParameters *par,
738 int native_id, int qt_id)
742 int ret, codecpriv_size;
744 ret = avio_open_dyn_buf(&dyn_cp);
749 ret = mkv_write_native_codecprivate(s, par, dyn_cp);
750 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
753 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
755 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
756 && (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
759 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
760 avio_wl32(dyn_cp, par->codec_tag);
761 for(i = 0; i < 0x5a - 8; i++)
764 avio_write(dyn_cp, par->extradata, par->extradata_size);
766 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
767 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
768 avcodec_get_name(par->codec_id));
771 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
773 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
774 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
775 avcodec_get_name(par->codec_id));
776 ret = AVERROR(EINVAL);
779 ff_put_bmp_header(dyn_cp, par, ff_codec_bmp_tags, 0, 0);
781 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
783 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
785 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
786 avcodec_get_name(par->codec_id));
787 ret = AVERROR(EINVAL);
790 par->codec_tag = tag;
792 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
795 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
797 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
803 static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
805 uint8_t *colorinfo_ptr;
806 int side_data_size = 0;
807 int ret, colorinfo_size;
808 const uint8_t *side_data = av_stream_get_side_data(
809 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA, &side_data_size);
811 ret = avio_open_dyn_buf(&dyn_cp);
815 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
816 par->color_trc < AVCOL_TRC_NB) {
817 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
820 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
821 par->color_space < AVCOL_SPC_NB) {
822 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
824 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
825 par->color_primaries < AVCOL_PRI_NB) {
826 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
828 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
829 par->color_range < AVCOL_RANGE_NB) {
830 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
832 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
833 ebml_master meta_element = start_ebml_master(
834 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
835 const AVMasteringDisplayMetadata *metadata =
836 (const AVMasteringDisplayMetadata*)side_data;
837 if (metadata->has_primaries) {
838 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
839 av_q2d(metadata->display_primaries[0][0]));
840 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
841 av_q2d(metadata->display_primaries[0][1]));
842 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
843 av_q2d(metadata->display_primaries[1][0]));
844 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
845 av_q2d(metadata->display_primaries[1][1]));
846 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
847 av_q2d(metadata->display_primaries[2][0]));
848 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
849 av_q2d(metadata->display_primaries[2][1]));
850 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
851 av_q2d(metadata->white_point[0]));
852 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
853 av_q2d(metadata->white_point[1]));
855 if (metadata->has_luminance) {
856 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
857 av_q2d(metadata->max_luminance));
858 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
859 av_q2d(metadata->min_luminance));
861 end_ebml_master(dyn_cp, meta_element);
864 colorinfo_size = avio_close_dyn_buf(dyn_cp, &colorinfo_ptr);
865 if (colorinfo_size) {
866 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, 0);
867 avio_write(pb, colorinfo_ptr, colorinfo_size);
868 end_ebml_master(pb, colorinfo);
870 av_free(colorinfo_ptr);
874 static void mkv_write_field_order(AVIOContext *pb, int mode,
875 enum AVFieldOrder field_order)
877 switch (field_order) {
878 case AV_FIELD_UNKNOWN:
880 case AV_FIELD_PROGRESSIVE:
881 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
882 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
888 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
889 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
890 if (mode != MODE_WEBM) {
891 switch (field_order) {
893 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
894 MATROSKA_VIDEO_FIELDORDER_TT);
897 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
898 MATROSKA_VIDEO_FIELDORDER_BB);
901 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
902 MATROSKA_VIDEO_FIELDORDER_TB);
905 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
906 MATROSKA_VIDEO_FIELDORDER_BT);
913 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
914 AVStream *st, int mode, int *h_width, int *h_height)
918 AVDictionaryEntry *tag;
919 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
923 // convert metadata into proper side data and add it to the stream
924 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
925 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
926 int stereo_mode = atoi(tag->value);
928 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
929 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
934 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
935 stereo_mode != 10 && stereo_mode != 12) {
936 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
942 // iterate to find the stereo3d side data
943 for (i = 0; i < st->nb_side_data; i++) {
944 AVPacketSideData sd = st->side_data[i];
945 if (sd.type == AV_PKT_DATA_STEREO3D) {
946 AVStereo3D *stereo = (AVStereo3D *)sd.data;
948 switch (stereo->type) {
950 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
952 case AV_STEREO3D_SIDEBYSIDE:
953 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
954 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
955 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
958 case AV_STEREO3D_TOPBOTTOM:
959 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
960 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
964 case AV_STEREO3D_CHECKERBOARD:
965 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
966 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
969 case AV_STEREO3D_LINES:
970 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
971 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
975 case AV_STEREO3D_COLUMNS:
976 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
977 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
981 case AV_STEREO3D_FRAMESEQUENCE:
982 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
983 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
991 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
994 // if webm, do not write unsupported modes
995 if ((mode == MODE_WEBM &&
996 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
997 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
998 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
999 av_log(s, AV_LOG_ERROR,
1000 "The specified stereo mode is not valid.\n");
1001 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1002 return AVERROR(EINVAL);
1005 // write StereoMode if format is valid
1006 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1011 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1012 int i, AVIOContext *pb, int default_stream_exists)
1014 AVStream *st = s->streams[i];
1015 AVCodecParameters *par = st->codecpar;
1016 ebml_master subinfo, track;
1019 int bit_depth = av_get_bits_per_sample(par->codec_id);
1020 int sample_rate = par->sample_rate;
1021 int output_sample_rate = 0;
1022 int display_width_div = 1;
1023 int display_height_div = 1;
1025 AVDictionaryEntry *tag;
1027 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1028 mkv->have_attachments = 1;
1032 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
1033 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1034 if (par->bits_per_raw_sample)
1035 bit_depth = par->bits_per_raw_sample;
1037 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1040 bit_depth = par->bits_per_coded_sample;
1043 if (par->codec_id == AV_CODEC_ID_AAC) {
1044 ret = get_aac_sample_rates(s, par, &sample_rate, &output_sample_rate);
1049 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1050 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1051 mkv->is_dash ? mkv->dash_track_number : i + 1);
1052 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1053 mkv->is_dash ? mkv->dash_track_number : i + 1);
1054 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1056 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1057 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1058 tag = av_dict_get(st->metadata, "language", NULL, 0);
1059 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1060 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
1061 } else if (tag && tag->value) {
1062 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
1065 // The default value for TRACKFLAGDEFAULT is 1, so add element
1066 // if we need to clear it.
1067 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1068 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1070 if (st->disposition & AV_DISPOSITION_FORCED)
1071 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1073 if (mkv->mode == MODE_WEBM && par->codec_id == AV_CODEC_ID_WEBVTT) {
1074 const char *codec_id;
1075 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1076 codec_id = "D_WEBVTT/CAPTIONS";
1077 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1078 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1079 codec_id = "D_WEBVTT/DESCRIPTIONS";
1080 native_id = MATROSKA_TRACK_TYPE_METADATA;
1081 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1082 codec_id = "D_WEBVTT/METADATA";
1083 native_id = MATROSKA_TRACK_TYPE_METADATA;
1085 codec_id = "D_WEBVTT/SUBTITLES";
1086 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1088 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1090 // look for a codec ID string specific to mkv to use,
1091 // if none are found, use AVI codes
1092 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1093 if (ff_mkv_codec_tags[j].id == par->codec_id) {
1094 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1099 if (par->codec_id == AV_CODEC_ID_RAWVIDEO && !par->codec_tag) {
1100 if (mkv->allow_raw_vfw) {
1103 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1104 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1105 return AVERROR(EINVAL);
1110 if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1111 int64_t codecdelay = av_rescale_q(par->initial_padding,
1112 (AVRational){ 1, 48000 },
1113 (AVRational){ 1, 1000000000 });
1114 if (codecdelay < 0) {
1115 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1116 return AVERROR(EINVAL);
1118 // mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1119 // (AVRational){ 1, par->sample_rate },
1122 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1124 if (par->codec_id == AV_CODEC_ID_OPUS) {
1125 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1128 if (mkv->mode == MODE_WEBM && !(par->codec_id == AV_CODEC_ID_VP8 ||
1129 par->codec_id == AV_CODEC_ID_VP9 ||
1130 par->codec_id == AV_CODEC_ID_OPUS ||
1131 par->codec_id == AV_CODEC_ID_VORBIS ||
1132 par->codec_id == AV_CODEC_ID_WEBVTT)) {
1133 av_log(s, AV_LOG_ERROR,
1134 "Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1135 return AVERROR(EINVAL);
1138 switch (par->codec_type) {
1139 case AVMEDIA_TYPE_VIDEO:
1140 mkv->have_video = 1;
1141 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1143 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1144 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1145 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1147 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->time_base.num / st->time_base.den);
1150 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1151 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1152 par->codec_id == AV_CODEC_ID_SVQ1 ||
1153 par->codec_id == AV_CODEC_ID_SVQ3 ||
1154 par->codec_id == AV_CODEC_ID_CINEPAK))
1158 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1159 else if (!native_id) {
1160 // if there is no mkv-specific codec ID, use VFW mode
1161 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1162 mkv->tracks[i].write_dts = 1;
1163 s->internal->avoid_negative_ts_use_pts = 0;
1166 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1168 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1169 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1171 mkv_write_field_order(pb, mkv->mode, par->field_order);
1173 // check both side data and metadata for stereo information,
1174 // write the result to the bitstream if any is found
1175 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1177 &display_height_div);
1181 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1182 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1183 (par->format == AV_PIX_FMT_YUVA420P)) {
1184 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1187 // write DisplayWidth and DisplayHeight, they contain the size of
1188 // a single source view and/or the display aspect ratio
1189 if (st->sample_aspect_ratio.num) {
1190 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1191 if (d_width > INT_MAX) {
1192 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1193 return AVERROR(EINVAL);
1195 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1196 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1197 } else if (display_width_div != 1 || display_height_div != 1) {
1198 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1199 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1201 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1203 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1204 uint32_t color_space = av_le2ne32(par->codec_tag);
1205 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1207 if (s->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
1208 ret = mkv_write_video_color(pb, par, st);
1212 end_ebml_master(pb, subinfo);
1215 case AVMEDIA_TYPE_AUDIO:
1216 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1219 // no mkv-specific ID, use ACM mode
1220 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1222 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1223 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1224 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1225 if (output_sample_rate)
1226 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1228 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1229 end_ebml_master(pb, subinfo);
1232 case AVMEDIA_TYPE_SUBTITLE:
1234 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1235 return AVERROR(ENOSYS);
1238 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1239 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1241 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1244 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1245 return AVERROR(EINVAL);
1248 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1249 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1254 end_ebml_master(pb, track);
1259 static int mkv_write_tracks(AVFormatContext *s)
1261 MatroskaMuxContext *mkv = s->priv_data;
1262 AVIOContext *dyn_cp, *pb = s->pb;
1264 int i, ret, default_stream_exists = 0;
1266 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1270 ret = start_ebml_master_crc32(pb, &dyn_cp, &tracks, MATROSKA_ID_TRACKS, 0);
1274 for (i = 0; i < s->nb_streams; i++) {
1275 AVStream *st = s->streams[i];
1276 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1278 for (i = 0; i < s->nb_streams; i++) {
1279 ret = mkv_write_track(s, mkv, i, dyn_cp, default_stream_exists);
1283 end_ebml_master_crc32(pb, &dyn_cp, mkv, tracks);
1287 static int mkv_write_chapters(AVFormatContext *s)
1289 MatroskaMuxContext *mkv = s->priv_data;
1290 AVIOContext *dyn_cp, *pb = s->pb;
1291 ebml_master chapters, editionentry;
1292 AVRational scale = {1, 1E9};
1295 if (!s->nb_chapters || mkv->wrote_chapters)
1298 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1299 if (ret < 0) return ret;
1301 ret = start_ebml_master_crc32(pb, &dyn_cp, &chapters, MATROSKA_ID_CHAPTERS, 0);
1302 if (ret < 0) return ret;
1304 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1305 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1306 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1307 for (i = 0; i < s->nb_chapters; i++) {
1308 ebml_master chapteratom, chapterdisplay;
1309 AVChapter *c = s->chapters[i];
1310 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1311 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1312 AVDictionaryEntry *t = NULL;
1313 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1314 av_log(s, AV_LOG_ERROR,
1315 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1316 chapterstart, chapterend);
1317 return AVERROR_INVALIDDATA;
1320 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1321 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1322 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1323 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1324 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1325 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1326 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1327 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1328 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1329 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1330 end_ebml_master(dyn_cp, chapterdisplay);
1332 end_ebml_master(dyn_cp, chapteratom);
1334 end_ebml_master(dyn_cp, editionentry);
1335 end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
1337 mkv->wrote_chapters = 1;
1341 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1343 uint8_t *key = av_strdup(t->key);
1345 const uint8_t *lang = NULL;
1349 return AVERROR(ENOMEM);
1351 if ((p = strrchr(p, '-')) &&
1352 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1359 else if (*p >= 'a' && *p <= 'z')
1364 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1365 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1367 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1368 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1369 end_ebml_master(pb, tag);
1375 static int mkv_write_tag_targets(AVFormatContext *s,
1376 unsigned int elementid, unsigned int uid,
1377 ebml_master *tags, ebml_master* tag)
1380 MatroskaMuxContext *mkv = s->priv_data;
1381 ebml_master targets;
1385 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1386 if (ret < 0) return ret;
1388 start_ebml_master_crc32(s->pb, &mkv->tags_bc, tags, MATROSKA_ID_TAGS, 0);
1392 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1393 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1395 put_ebml_uint(pb, elementid, uid);
1396 end_ebml_master(pb, targets);
1400 static int mkv_check_tag_name(const char *name, unsigned int elementid)
1402 return av_strcasecmp(name, "title") &&
1403 av_strcasecmp(name, "stereo_mode") &&
1404 av_strcasecmp(name, "creation_time") &&
1405 av_strcasecmp(name, "encoding_tool") &&
1406 av_strcasecmp(name, "duration") &&
1407 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1408 av_strcasecmp(name, "language")) &&
1409 (elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1410 (av_strcasecmp(name, "filename") &&
1411 av_strcasecmp(name, "mimetype")));
1414 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1415 unsigned int uid, ebml_master *tags)
1417 MatroskaMuxContext *mkv = s->priv_data;
1420 AVDictionaryEntry *t = NULL;
1422 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1426 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1427 if (mkv_check_tag_name(t->key, elementid)) {
1428 ret = mkv_write_simpletag(mkv->tags_bc, t);
1434 end_ebml_master(mkv->tags_bc, tag);
1438 static int mkv_check_tag(AVDictionary *m, unsigned int elementid)
1440 AVDictionaryEntry *t = NULL;
1442 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1443 if (mkv_check_tag_name(t->key, elementid))
1449 static int mkv_write_tags(AVFormatContext *s)
1451 MatroskaMuxContext *mkv = s->priv_data;
1454 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1456 if (mkv_check_tag(s->metadata, 0)) {
1457 ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
1458 if (ret < 0) return ret;
1461 for (i = 0; i < s->nb_streams; i++) {
1462 AVStream *st = s->streams[i];
1464 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1467 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1470 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
1471 if (ret < 0) return ret;
1474 if (s->pb->seekable && !mkv->is_live) {
1475 for (i = 0; i < s->nb_streams; i++) {
1477 AVStream *st = s->streams[i];
1478 ebml_master tag_target;
1481 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1484 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
1487 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1488 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1489 mkv->stream_duration_offsets[i] = avio_tell(pb);
1491 // Reserve space to write duration as a 20-byte string.
1492 // 2 (ebml id) + 1 (data size) + 20 (data)
1493 put_ebml_void(pb, 23);
1494 end_ebml_master(pb, tag);
1495 end_ebml_master(pb, tag_target);
1499 for (i = 0; i < s->nb_chapters; i++) {
1500 AVChapter *ch = s->chapters[i];
1502 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1505 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
1506 if (ret < 0) return ret;
1509 if (mkv->have_attachments) {
1510 for (i = 0; i < mkv->attachments->num_entries; i++) {
1511 mkv_attachment *attachment = &mkv->attachments->entries[i];
1512 AVStream *st = s->streams[attachment->stream_idx];
1514 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1517 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid, &mkv->tags);
1523 if (mkv->tags.pos) {
1524 if (s->pb->seekable && !mkv->is_live)
1525 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));
1527 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1532 static int mkv_write_attachments(AVFormatContext *s)
1534 MatroskaMuxContext *mkv = s->priv_data;
1535 AVIOContext *dyn_cp, *pb = s->pb;
1536 ebml_master attachments;
1540 if (!mkv->have_attachments)
1543 mkv->attachments = av_mallocz(sizeof(*mkv->attachments));
1544 if (!mkv->attachments)
1547 av_lfg_init(&c, av_get_random_seed());
1549 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1550 if (ret < 0) return ret;
1552 ret = start_ebml_master_crc32(pb, &dyn_cp, &attachments, MATROSKA_ID_ATTACHMENTS, 0);
1553 if (ret < 0) return ret;
1555 for (i = 0; i < s->nb_streams; i++) {
1556 AVStream *st = s->streams[i];
1557 ebml_master attached_file;
1558 mkv_attachment *attachment = mkv->attachments->entries;
1559 AVDictionaryEntry *t;
1560 const char *mimetype = NULL;
1563 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1566 attachment = av_realloc_array(attachment, mkv->attachments->num_entries + 1, sizeof(mkv_attachment));
1568 return AVERROR(ENOMEM);
1569 mkv->attachments->entries = attachment;
1571 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1573 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1574 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1575 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1576 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1577 return AVERROR(EINVAL);
1579 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1580 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1581 mimetype = t->value;
1582 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1584 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1585 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1586 mimetype = ff_mkv_mime_tags[i].str;
1589 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1590 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1591 mimetype = ff_mkv_image_mime_tags[i].str;
1596 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1597 "it cannot be deduced from the codec id.\n", i);
1598 return AVERROR(EINVAL);
1601 if (s->flags & AVFMT_FLAG_BITEXACT) {
1602 struct AVSHA *sha = av_sha_alloc();
1605 return AVERROR(ENOMEM);
1606 av_sha_init(sha, 160);
1607 av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1608 av_sha_final(sha, digest);
1610 fileuid = AV_RL32(digest);
1612 fileuid = av_lfg_get(&c);
1614 av_log(s, AV_LOG_VERBOSE, "Using %.8"PRIx32" for attachment %d\n",
1615 fileuid, mkv->attachments->num_entries);
1617 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1618 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1619 put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1620 end_ebml_master(dyn_cp, attached_file);
1622 mkv->attachments->entries[mkv->attachments->num_entries].stream_idx = i;
1623 mkv->attachments->entries[mkv->attachments->num_entries++].fileuid = fileuid;
1625 end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
1630 static int64_t get_metadata_duration(AVFormatContext *s)
1636 AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1637 if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1638 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1642 for (i = 0; i < s->nb_streams; i++) {
1644 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1646 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1647 max = FFMAX(max, us);
1650 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1654 static int mkv_write_header(AVFormatContext *s)
1656 MatroskaMuxContext *mkv = s->priv_data;
1657 AVIOContext *pb = s->pb;
1658 ebml_master ebml_header;
1659 AVDictionaryEntry *tag;
1660 int ret, i, version = 2;
1661 int64_t creation_time;
1663 if (!strcmp(s->oformat->name, "webm"))
1664 mkv->mode = MODE_WEBM;
1666 mkv->mode = MODE_MATROSKAv2;
1668 if (mkv->mode != MODE_WEBM ||
1669 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1670 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1673 for (i = 0; i < s->nb_streams; i++) {
1674 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
1675 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
1676 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
1677 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
1678 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
1679 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
1680 av_log(s, AV_LOG_ERROR,
1681 "The Matroska muxer does not yet support muxing %s\n",
1682 avcodec_get_name(s->streams[i]->codecpar->codec_id));
1683 return AVERROR_PATCHWELCOME;
1685 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1686 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1687 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1691 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1693 ret = AVERROR(ENOMEM);
1696 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1697 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1698 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1699 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1700 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1701 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1702 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1703 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1704 end_ebml_master(pb, ebml_header);
1706 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1707 mkv->segment_offset = avio_tell(pb);
1709 // we write 2 seek heads - one at the end of the file to point to each
1710 // cluster, and one at the beginning to point to all other level one
1711 // elements (including the seek head at the end of the file), which
1712 // isn't more than 10 elements if we only write one of each other
1713 // currently defined level 1 element
1714 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1715 if (!mkv->main_seekhead) {
1716 ret = AVERROR(ENOMEM);
1720 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1721 if (ret < 0) goto fail;
1723 ret = start_ebml_master_crc32(pb, &mkv->info_bc, &mkv->info, MATROSKA_ID_INFO, 0);
1728 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1729 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1730 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1731 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1732 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1733 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1734 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1736 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1738 if (mkv->mode != MODE_WEBM) {
1739 uint32_t segment_uid[4];
1742 av_lfg_init(&lfg, av_get_random_seed());
1744 for (i = 0; i < 4; i++)
1745 segment_uid[i] = av_lfg_get(&lfg);
1747 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1750 const char *ident = "Lavf";
1751 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1752 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1755 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1756 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1757 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1758 uint8_t date_utc_buf[8];
1759 AV_WB64(date_utc_buf, date_utc);
1760 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1763 // reserve space for the duration
1765 mkv->duration_offset = avio_tell(pb);
1766 if (!mkv->is_live) {
1767 int64_t metadata_duration = get_metadata_duration(s);
1769 if (s->duration > 0) {
1770 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1771 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1772 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1773 } else if (metadata_duration > 0) {
1774 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1775 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1776 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1778 put_ebml_void(pb, 11); // assumes double-precision float to be written
1781 if (s->pb->seekable)
1782 put_ebml_void(s->pb, avio_tell(pb) + ((mkv->write_crc && mkv->mode != MODE_WEBM) ? 2 /* ebml id + data size */ + 4 /* CRC32 */ : 0));
1784 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
1787 // initialize stream_duration fields
1788 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1789 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1791 ret = mkv_write_tracks(s);
1795 for (i = 0; i < s->nb_chapters; i++)
1796 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1798 if (mkv->mode != MODE_WEBM) {
1799 ret = mkv_write_chapters(s);
1803 ret = mkv_write_attachments(s);
1807 ret = mkv_write_tags(s);
1812 if (!s->pb->seekable && !mkv->is_live)
1813 mkv_write_seekhead(pb, mkv);
1815 mkv->cues = mkv_start_cues(mkv->segment_offset);
1817 ret = AVERROR(ENOMEM);
1820 if (pb->seekable && mkv->reserve_cues_space) {
1821 mkv->cues_pos = avio_tell(pb);
1822 put_ebml_void(pb, mkv->reserve_cues_space);
1825 av_init_packet(&mkv->cur_audio_pkt);
1826 mkv->cur_audio_pkt.size = 0;
1827 mkv->cluster_pos = -1;
1831 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1832 // after 4k and on a keyframe
1834 if (mkv->cluster_time_limit < 0)
1835 mkv->cluster_time_limit = 5000;
1836 if (mkv->cluster_size_limit < 0)
1837 mkv->cluster_size_limit = 5 * 1024 * 1024;
1839 if (mkv->cluster_time_limit < 0)
1840 mkv->cluster_time_limit = 1000;
1841 if (mkv->cluster_size_limit < 0)
1842 mkv->cluster_size_limit = 32 * 1024;
1851 static int mkv_blockgroup_size(int pkt_size)
1853 int size = pkt_size + 4;
1854 size += ebml_num_size(size);
1855 size += 2; // EBML ID for block and block duration
1856 size += 8; // max size of block duration
1857 size += ebml_num_size(size);
1858 size += 1; // blockgroup EBML ID
1862 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1869 dst = av_malloc(srclen);
1871 return AVERROR(ENOMEM);
1873 while (srclen >= WV_HEADER_SIZE) {
1876 ret = ff_wv_parse_header(&header, src);
1879 src += WV_HEADER_SIZE;
1880 srclen -= WV_HEADER_SIZE;
1882 if (srclen < header.blocksize) {
1883 ret = AVERROR_INVALIDDATA;
1887 if (header.initial) {
1888 AV_WL32(dst + offset, header.samples);
1891 AV_WL32(dst + offset, header.flags);
1892 AV_WL32(dst + offset + 4, header.crc);
1895 if (!(header.initial && header.final)) {
1896 AV_WL32(dst + offset, header.blocksize);
1900 memcpy(dst + offset, src, header.blocksize);
1901 src += header.blocksize;
1902 srclen -= header.blocksize;
1903 offset += header.blocksize;
1915 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1916 unsigned int blockid, AVPacket *pkt, int keyframe)
1918 MatroskaMuxContext *mkv = s->priv_data;
1919 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
1920 uint8_t *data = NULL, *side_data = NULL;
1921 int offset = 0, size = pkt->size, side_data_size = 0;
1922 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1923 uint64_t additional_id = 0;
1924 int64_t discard_padding = 0;
1925 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
1926 ebml_master block_group, block_additions, block_more;
1928 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1929 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
1930 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
1932 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
1933 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1934 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1935 else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
1936 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1937 /* extradata is Annex B, assume the bitstream is too and convert it */
1938 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1939 else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
1940 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1942 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1948 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
1949 /* Matroska specification requires to remove the first QuickTime atom
1955 side_data = av_packet_get_side_data(pkt,
1956 AV_PKT_DATA_SKIP_SAMPLES,
1959 if (side_data && side_data_size >= 10) {
1960 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1961 (AVRational){1, par->sample_rate},
1962 (AVRational){1, 1000000000});
1965 side_data = av_packet_get_side_data(pkt,
1966 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1969 additional_id = AV_RB64(side_data);
1971 side_data_size -= 8;
1974 if ((side_data_size && additional_id == 1) || discard_padding) {
1975 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1976 blockid = MATROSKA_ID_BLOCK;
1979 put_ebml_id(pb, blockid);
1980 put_ebml_num(pb, size + 4, 0);
1981 // this assumes stream_index is less than 126
1982 avio_w8(pb, 0x80 | track_number);
1983 avio_wb16(pb, ts - mkv->cluster_pts);
1984 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
1985 avio_write(pb, data + offset, size);
1986 if (data != pkt->data)
1989 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
1990 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
1991 mkv->last_track_timestamp[track_number - 1]);
1993 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
1995 if (discard_padding) {
1996 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1999 if (side_data_size && additional_id == 1) {
2000 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2001 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2002 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
2003 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
2004 put_ebml_num(pb, side_data_size, 0);
2005 avio_write(pb, side_data, side_data_size);
2006 end_ebml_master(pb, block_more);
2007 end_ebml_master(pb, block_additions);
2009 if ((side_data_size && additional_id == 1) || discard_padding) {
2010 end_ebml_master(pb, block_group);
2014 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
2016 MatroskaMuxContext *mkv = s->priv_data;
2017 ebml_master blockgroup;
2018 int id_size, settings_size, size;
2019 uint8_t *id, *settings;
2020 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2021 const int flags = 0;
2024 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2028 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2031 size = id_size + 1 + settings_size + 1 + pkt->size;
2033 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2034 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
2035 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
2037 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
2039 put_ebml_id(pb, MATROSKA_ID_BLOCK);
2040 put_ebml_num(pb, size + 4, 0);
2041 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
2042 avio_wb16(pb, ts - mkv->cluster_pts);
2044 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2046 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2047 end_ebml_master(pb, blockgroup);
2049 return pkt->duration;
2052 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
2054 MatroskaMuxContext *mkv = s->priv_data;
2056 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2057 mkv->cluster_pos = -1;
2058 if (s->pb->seekable)
2059 av_log(s, AV_LOG_DEBUG,
2060 "Starting new cluster at offset %" PRIu64 " bytes, "
2061 "pts %" PRIu64 "dts %" PRIu64 "\n",
2062 avio_tell(s->pb), pkt->pts, pkt->dts);
2064 av_log(s, AV_LOG_DEBUG, "Starting new cluster, "
2065 "pts %" PRIu64 "dts %" PRIu64 "\n",
2066 pkt->pts, pkt->dts);
2070 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2072 MatroskaMuxContext *mkv = s->priv_data;
2073 AVIOContext *pb = s->pb;
2074 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2075 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2076 int duration = pkt->duration;
2078 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2079 int64_t relative_packet_pos;
2080 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
2082 if (ts == AV_NOPTS_VALUE) {
2083 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2084 return AVERROR(EINVAL);
2086 ts += mkv->tracks[pkt->stream_index].ts_offset;
2088 if (mkv->cluster_pos != -1) {
2089 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
2090 if ((int16_t)cluster_time != cluster_time) {
2091 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2092 mkv_start_new_cluster(s, pkt);
2096 if (mkv->cluster_pos == -1) {
2097 mkv->cluster_pos = avio_tell(s->pb);
2098 ret = start_ebml_master_crc32(s->pb, &mkv->dyn_bc, &mkv->cluster, MATROSKA_ID_CLUSTER, 0);
2101 put_ebml_uint(mkv->dyn_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2102 mkv->cluster_pts = FFMAX(0, ts);
2106 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos + avio_tell(pb);
2108 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2109 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2110 if (s->pb->seekable && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2111 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
2112 if (ret < 0) return ret;
2115 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2116 duration = mkv_write_vtt_blocks(s, pb, pkt);
2118 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2119 mkv_blockgroup_size(pkt->size));
2121 #if FF_API_CONVERGENCE_DURATION
2122 FF_DISABLE_DEPRECATION_WARNINGS
2123 /* For backward compatibility, prefer convergence_duration. */
2124 if (pkt->convergence_duration > 0) {
2125 duration = pkt->convergence_duration;
2127 FF_ENABLE_DEPRECATION_WARNINGS
2129 /* All subtitle blocks are considered to be keyframes. */
2130 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2131 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2132 end_ebml_master(pb, blockgroup);
2135 if (s->pb->seekable) {
2136 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
2137 mkv->cluster_pos, relative_packet_pos, duration);
2143 mkv->duration = FFMAX(mkv->duration, ts + duration);
2145 if (mkv->stream_durations)
2146 mkv->stream_durations[pkt->stream_index] =
2147 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
2152 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2154 MatroskaMuxContext *mkv = s->priv_data;
2155 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2156 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2158 int64_t cluster_time;
2160 int start_new_cluster;
2162 if (mkv->tracks[pkt->stream_index].write_dts)
2163 cluster_time = pkt->dts - mkv->cluster_pts;
2165 cluster_time = pkt->pts - mkv->cluster_pts;
2166 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2168 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2169 // after 4k and on a keyframe
2170 cluster_size = avio_tell(mkv->dyn_bc);
2172 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2173 // WebM DASH specification states that the first block of every cluster
2174 // has to be a key frame. So for DASH video, we only create a cluster
2175 // on seeing key frames.
2176 start_new_cluster = keyframe;
2177 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2178 (mkv->cluster_pos == -1 ||
2179 cluster_time > mkv->cluster_time_limit)) {
2180 // For DASH audio, we create a Cluster based on cluster_time_limit
2181 start_new_cluster = 1;
2182 } else if (!mkv->is_dash &&
2183 (cluster_size > mkv->cluster_size_limit ||
2184 cluster_time > mkv->cluster_time_limit ||
2185 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2186 cluster_size > 4 * 1024))) {
2187 start_new_cluster = 1;
2189 start_new_cluster = 0;
2192 if (mkv->cluster_pos != -1 && start_new_cluster) {
2193 mkv_start_new_cluster(s, pkt);
2196 if (!mkv->cluster_pos)
2197 avio_write_marker(s->pb,
2198 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2199 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2201 // check if we have an audio packet cached
2202 if (mkv->cur_audio_pkt.size > 0) {
2203 // for DASH audio, a CuePoint has to be added when there is a new cluster.
2204 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2205 mkv->is_dash ? start_new_cluster : 0);
2206 av_packet_unref(&mkv->cur_audio_pkt);
2208 av_log(s, AV_LOG_ERROR,
2209 "Could not write cached audio packet ret:%d\n", ret);
2214 // buffer an audio packet to ensure the packet containing the video
2215 // keyframe's timecode is contained in the same cluster for WebM
2216 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2217 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2219 ret = mkv_write_packet_internal(s, pkt, 0);
2223 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2225 MatroskaMuxContext *mkv = s->priv_data;
2228 if (mkv->cluster_pos != -1) {
2229 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2230 mkv->cluster_pos = -1;
2231 if (s->pb->seekable)
2232 av_log(s, AV_LOG_DEBUG,
2233 "Flushing cluster at offset %" PRIu64 " bytes\n",
2236 av_log(s, AV_LOG_DEBUG, "Flushing cluster\n");
2241 return mkv_write_packet(s, pkt);
2244 static int mkv_write_trailer(AVFormatContext *s)
2246 MatroskaMuxContext *mkv = s->priv_data;
2247 AVIOContext *pb = s->pb;
2248 int64_t currentpos, cuespos;
2251 // check if we have an audio packet cached
2252 if (mkv->cur_audio_pkt.size > 0) {
2253 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2254 av_packet_unref(&mkv->cur_audio_pkt);
2256 av_log(s, AV_LOG_ERROR,
2257 "Could not write cached audio packet ret:%d\n", ret);
2263 end_ebml_master_crc32(pb, &mkv->dyn_bc, mkv, mkv->cluster);
2266 if (mkv->mode != MODE_WEBM) {
2267 ret = mkv_write_chapters(s);
2273 if (mkv->cues->num_entries) {
2274 if (mkv->reserve_cues_space) {
2277 currentpos = avio_tell(pb);
2278 avio_seek(pb, mkv->cues_pos, SEEK_SET);
2280 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2281 cues_end = avio_tell(pb);
2282 if (cues_end > cuespos + mkv->reserve_cues_space) {
2283 av_log(s, AV_LOG_ERROR,
2284 "Insufficient space reserved for cues: %d "
2285 "(needed: %" PRId64 ").\n",
2286 mkv->reserve_cues_space, cues_end - cuespos);
2287 return AVERROR(EINVAL);
2290 if (cues_end < cuespos + mkv->reserve_cues_space)
2291 put_ebml_void(pb, mkv->reserve_cues_space -
2292 (cues_end - cuespos));
2294 avio_seek(pb, currentpos, SEEK_SET);
2296 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2299 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2305 mkv_write_seekhead(pb, mkv);
2307 // update the duration
2308 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2309 currentpos = avio_tell(pb);
2310 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2311 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2312 avio_seek(pb, mkv->info.pos, SEEK_SET);
2313 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
2315 // update stream durations
2316 if (!mkv->is_live && mkv->stream_durations) {
2318 int64_t curr = avio_tell(mkv->tags_bc);
2319 for (i = 0; i < s->nb_streams; ++i) {
2320 AVStream *st = s->streams[i];
2322 if (mkv->stream_duration_offsets[i] > 0) {
2323 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2324 char duration_string[20] = "";
2326 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2327 mkv->stream_durations[i]);
2329 avio_seek(mkv->tags_bc, mkv->stream_duration_offsets[i], SEEK_SET);
2331 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2332 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2333 fmod(duration_sec, 60));
2335 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2338 avio_seek(mkv->tags_bc, curr, SEEK_SET);
2340 if (mkv->tags.pos && !mkv->is_live) {
2341 avio_seek(pb, mkv->tags.pos, SEEK_SET);
2342 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
2345 avio_seek(pb, currentpos, SEEK_SET);
2348 if (!mkv->is_live) {
2349 end_ebml_master(pb, mkv->segment);
2356 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2359 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2360 if (ff_mkv_codec_tags[i].id == codec_id)
2363 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2364 enum AVMediaType type = avcodec_get_type(codec_id);
2365 // mkv theoretically supports any video/audio through VFW/ACM
2366 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2373 static int mkv_init(struct AVFormatContext *s)
2377 if (s->avoid_negative_ts < 0) {
2378 s->avoid_negative_ts = 1;
2379 s->internal->avoid_negative_ts_use_pts = 1;
2382 for (i = 0; i < s->nb_streams; i++) {
2383 // ms precision is the de-facto standard timescale for mkv files
2384 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2390 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2393 AVStream *st = s->streams[pkt->stream_index];
2395 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2396 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2397 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2398 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2399 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2405 static const AVCodecTag additional_audio_tags[] = {
2406 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2407 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
2408 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2409 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2410 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2411 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2412 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2413 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2414 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2415 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2416 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2417 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2418 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2421 static const AVCodecTag additional_video_tags[] = {
2422 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2423 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2424 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2425 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
2426 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
2427 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2430 static const AVCodecTag additional_subtitle_tags[] = {
2431 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2432 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2433 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2436 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2437 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2438 static const AVOption options[] = {
2439 { "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 },
2440 { "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 },
2441 { "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 },
2442 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2443 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2444 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2445 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2446 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2450 #if CONFIG_MATROSKA_MUXER
2451 static const AVClass matroska_class = {
2452 .class_name = "matroska muxer",
2453 .item_name = av_default_item_name,
2455 .version = LIBAVUTIL_VERSION_INT,
2458 AVOutputFormat ff_matroska_muxer = {
2460 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2461 .mime_type = "video/x-matroska",
2462 .extensions = "mkv",
2463 .priv_data_size = sizeof(MatroskaMuxContext),
2464 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2465 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2466 .video_codec = CONFIG_LIBX264_ENCODER ?
2467 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2469 .write_header = mkv_write_header,
2470 .write_packet = mkv_write_flush_packet,
2471 .write_trailer = mkv_write_trailer,
2472 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2473 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2474 .codec_tag = (const AVCodecTag* const []){
2475 ff_codec_bmp_tags, ff_codec_wav_tags,
2476 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2478 .subtitle_codec = AV_CODEC_ID_ASS,
2479 .query_codec = mkv_query_codec,
2480 .check_bitstream = mkv_check_bitstream,
2481 .priv_class = &matroska_class,
2485 #if CONFIG_WEBM_MUXER
2486 static const AVClass webm_class = {
2487 .class_name = "webm muxer",
2488 .item_name = av_default_item_name,
2490 .version = LIBAVUTIL_VERSION_INT,
2493 AVOutputFormat ff_webm_muxer = {
2495 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2496 .mime_type = "video/webm",
2497 .extensions = "webm",
2498 .priv_data_size = sizeof(MatroskaMuxContext),
2499 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2500 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2501 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2503 .write_header = mkv_write_header,
2504 .write_packet = mkv_write_flush_packet,
2505 .write_trailer = mkv_write_trailer,
2506 .check_bitstream = mkv_check_bitstream,
2507 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2508 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2509 .priv_class = &webm_class,
2513 #if CONFIG_MATROSKA_AUDIO_MUXER
2514 static const AVClass mka_class = {
2515 .class_name = "matroska audio muxer",
2516 .item_name = av_default_item_name,
2518 .version = LIBAVUTIL_VERSION_INT,
2520 AVOutputFormat ff_matroska_audio_muxer = {
2522 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2523 .mime_type = "audio/x-matroska",
2524 .extensions = "mka",
2525 .priv_data_size = sizeof(MatroskaMuxContext),
2526 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2527 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2528 .video_codec = AV_CODEC_ID_NONE,
2530 .write_header = mkv_write_header,
2531 .write_packet = mkv_write_flush_packet,
2532 .write_trailer = mkv_write_trailer,
2533 .check_bitstream = mkv_check_bitstream,
2534 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2536 .codec_tag = (const AVCodecTag* const []){
2537 ff_codec_wav_tags, additional_audio_tags, 0
2539 .priv_class = &mka_class,