3 * Copyright (c) 2007 David Conrad
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "avio_internal.h"
28 #include "avlanguage.h"
34 #include "subtitles.h"
37 #include "libavutil/avstring.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lfg.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/random_seed.h"
45 #include "libavutil/samplefmt.h"
46 #include "libavutil/sha.h"
48 #include "libavcodec/xiph.h"
49 #include "libavcodec/mpeg4audio.h"
50 #include "libavcodec/internal.h"
52 typedef struct ebml_master {
53 int64_t pos; ///< absolute offset in the file where the master's elements start
54 int sizebytes; ///< how many bytes were reserved for the size
57 typedef struct mkv_seekhead_entry {
58 unsigned int elementid;
62 typedef struct mkv_seekhead {
64 int64_t segment_offset; ///< the file offset to the beginning of the segment
65 int reserved_size; ///< -1 if appending to file
67 mkv_seekhead_entry *entries;
75 int64_t cluster_pos; ///< file offset of the cluster containing the block
76 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
77 int64_t duration; ///< duration of the block according to time base
81 int64_t segment_offset;
82 mkv_cuepoint *entries;
92 #define MODE_MATROSKAv2 0x01
93 #define MODE_WEBM 0x02
95 typedef struct MatroskaMuxContext {
100 int64_t segment_offset;
102 int64_t cluster_pos; ///< file offset of the current cluster
104 int64_t duration_offset;
106 mkv_seekhead *main_seekhead;
110 AVPacket cur_audio_pkt;
112 int have_attachments;
114 int reserve_cues_space;
115 int cluster_size_limit;
117 int64_t cluster_time_limit;
119 int dash_track_number;
121 uint32_t chapter_id_offset;
123 } MatroskaMuxContext;
126 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
127 * offset, 4 bytes for target EBML ID */
128 #define MAX_SEEKENTRY_SIZE 21
130 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
132 #define MAX_CUETRACKPOS_SIZE 42
134 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
135 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
137 /** Seek preroll value for opus */
138 #define OPUS_SEEK_PREROLL 80000000
141 static int ebml_id_size(unsigned int id)
143 return (av_log2(id+1)-1)/7+1;
146 static void put_ebml_id(AVIOContext *pb, unsigned int id)
148 int i = ebml_id_size(id);
150 avio_w8(pb, (uint8_t)(id >> (i*8)));
154 * Write an EBML size meaning "unknown size".
156 * @param bytes The number of bytes the size should occupy (maximum: 8).
158 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
160 av_assert0(bytes <= 8);
161 avio_w8(pb, 0x1ff >> bytes);
162 ffio_fill(pb, 0xff, bytes - 1);
166 * Calculate how many bytes are needed to represent a given number in EBML.
168 static int ebml_num_size(uint64_t num)
171 while ((num+1) >> bytes*7) bytes++;
176 * Write a number in EBML variable length format.
178 * @param bytes The number of bytes that need to be used to write the number.
179 * If zero, any number of bytes can be used.
181 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
183 int i, needed_bytes = ebml_num_size(num);
185 // sizes larger than this are currently undefined in EBML
186 av_assert0(num < (1ULL<<56)-1);
189 // don't care how many bytes are used, so use the min
190 bytes = needed_bytes;
191 // the bytes needed to write the given size would exceed the bytes
192 // that we need to use, so write unknown size. This shouldn't happen.
193 av_assert0(bytes >= needed_bytes);
195 num |= 1ULL << bytes*7;
196 for (i = bytes - 1; i >= 0; i--)
197 avio_w8(pb, (uint8_t)(num >> i*8));
200 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
204 while (tmp>>=8) bytes++;
206 put_ebml_id(pb, elementid);
207 put_ebml_num(pb, bytes, 0);
208 for (i = bytes - 1; i >= 0; i--)
209 avio_w8(pb, (uint8_t)(val >> i*8));
212 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
215 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
217 while (tmp>>=8) bytes++;
219 put_ebml_id(pb, elementid);
220 put_ebml_num(pb, bytes, 0);
221 for (i = bytes - 1; i >= 0; i--)
222 avio_w8(pb, (uint8_t)(val >> i*8));
225 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
227 put_ebml_id(pb, elementid);
228 put_ebml_num(pb, 8, 0);
229 avio_wb64(pb, av_double2int(val));
232 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
233 const void *buf, int size)
235 put_ebml_id(pb, elementid);
236 put_ebml_num(pb, size, 0);
237 avio_write(pb, buf, size);
240 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
242 put_ebml_binary(pb, elementid, str, strlen(str));
246 * Write a void element of a given size. Useful for reserving space in
247 * the file to be written to later.
249 * @param size The number of bytes to reserve, which must be at least 2.
251 static void put_ebml_void(AVIOContext *pb, uint64_t size)
253 int64_t currentpos = avio_tell(pb);
255 av_assert0(size >= 2);
257 put_ebml_id(pb, EBML_ID_VOID);
258 // we need to subtract the length needed to store the size from the
259 // size we need to reserve so 2 cases, we use 8 bytes to store the
260 // size if possible, 1 byte otherwise
262 put_ebml_num(pb, size-1, 0);
264 put_ebml_num(pb, size-9, 8);
265 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
268 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
270 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
271 put_ebml_id(pb, elementid);
272 put_ebml_size_unknown(pb, bytes);
273 return (ebml_master){ avio_tell(pb), bytes };
276 static void end_ebml_master(AVIOContext *pb, ebml_master master)
278 int64_t pos = avio_tell(pb);
280 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
282 put_ebml_num(pb, pos - master.pos, master.sizebytes);
283 avio_seek(pb, pos, SEEK_SET);
286 static void put_xiph_size(AVIOContext *pb, int size)
288 ffio_fill(pb, 255, size / 255);
289 avio_w8(pb, size % 255);
293 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
294 * elements. If a maximum number of elements is specified, enough space
295 * will be reserved at the current file location to write a seek head of
298 * @param segment_offset The absolute offset to the position in the file
299 * where the segment begins.
300 * @param numelements The maximum number of elements that will be indexed
301 * by this seek head, 0 if unlimited.
303 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
305 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
306 if (new_seekhead == NULL)
309 new_seekhead->segment_offset = segment_offset;
311 if (numelements > 0) {
312 new_seekhead->filepos = avio_tell(pb);
313 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
314 // and size, and 3 bytes to guarantee that an EBML void element
315 // will fit afterwards
316 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
317 new_seekhead->max_entries = numelements;
318 put_ebml_void(pb, new_seekhead->reserved_size);
323 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
325 mkv_seekhead_entry *entries = seekhead->entries;
327 // don't store more elements than we reserved space for
328 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
331 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
333 return AVERROR(ENOMEM);
334 seekhead->entries = entries;
336 seekhead->entries[seekhead->num_entries].elementid = elementid;
337 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
343 * Write the seek head to the file and free it. If a maximum number of
344 * elements was specified to mkv_start_seekhead(), the seek head will
345 * be written at the location reserved for it. Otherwise, it is written
346 * at the current location in the file.
348 * @return The file offset where the seekhead was written,
349 * -1 if an error occurred.
351 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
353 ebml_master metaseek, seekentry;
357 currentpos = avio_tell(pb);
359 if (seekhead->reserved_size > 0) {
360 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
366 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
367 for (i = 0; i < seekhead->num_entries; i++) {
368 mkv_seekhead_entry *entry = &seekhead->entries[i];
370 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
372 put_ebml_id(pb, MATROSKA_ID_SEEKID);
373 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
374 put_ebml_id(pb, entry->elementid);
376 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
377 end_ebml_master(pb, seekentry);
379 end_ebml_master(pb, metaseek);
381 if (seekhead->reserved_size > 0) {
382 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
383 put_ebml_void(pb, remaining);
384 avio_seek(pb, currentpos, SEEK_SET);
386 currentpos = seekhead->filepos;
389 av_freep(&seekhead->entries);
395 static mkv_cues * mkv_start_cues(int64_t segment_offset)
397 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
401 cues->segment_offset = segment_offset;
405 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
406 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
408 mkv_cuepoint *entries = cues->entries;
413 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
415 return AVERROR(ENOMEM);
416 cues->entries = entries;
418 cues->entries[cues->num_entries].pts = ts;
419 cues->entries[cues->num_entries].stream_idx = stream;
420 cues->entries[cues->num_entries].tracknum = tracknum;
421 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
422 cues->entries[cues->num_entries].relative_pos = relative_pos;
423 cues->entries[cues->num_entries++].duration = duration;
428 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
430 ebml_master cues_element;
434 currentpos = avio_tell(pb);
435 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
437 for (i = 0; i < cues->num_entries; i++) {
438 ebml_master cuepoint, track_positions;
439 mkv_cuepoint *entry = &cues->entries[i];
440 uint64_t pts = entry->pts;
442 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
443 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
445 // put all the entries from different tracks that have the exact same
446 // timestamp into the same CuePoint
447 for (j = 0; j < num_tracks; j++)
448 tracks[j].has_cue = 0;
449 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
450 int tracknum = entry[j].stream_idx;
451 av_assert0(tracknum>=0 && tracknum<num_tracks);
452 if (tracks[tracknum].has_cue)
454 tracks[tracknum].has_cue = 1;
455 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
456 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
457 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
458 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
459 if (entry[j].duration != -1)
460 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
461 end_ebml_master(pb, track_positions);
464 end_ebml_master(pb, cuepoint);
466 end_ebml_master(pb, cues_element);
471 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
473 uint8_t *header_start[3];
475 int first_header_size;
478 if (codec->codec_id == AV_CODEC_ID_VORBIS)
479 first_header_size = 30;
481 first_header_size = 42;
483 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
484 first_header_size, header_start, header_len) < 0) {
485 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
489 avio_w8(pb, 2); // number packets - 1
490 for (j = 0; j < 2; j++) {
491 put_xiph_size(pb, header_len[j]);
493 for (j = 0; j < 3; j++)
494 avio_write(pb, header_start[j], header_len[j]);
499 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
501 if (codec->extradata && codec->extradata_size == 2)
502 avio_write(pb, codec->extradata, 2);
504 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
508 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
510 MPEG4AudioConfig mp4ac;
512 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
513 codec->extradata_size * 8, 1) < 0) {
514 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
518 *sample_rate = mp4ac.sample_rate;
519 *output_sample_rate = mp4ac.ext_sample_rate;
522 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
526 int ret, codecpriv_size;
528 ret = avio_open_dyn_buf(&dyn_cp);
533 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
534 ret = put_xiph_codecpriv(s, dyn_cp, codec);
535 else if (codec->codec_id == AV_CODEC_ID_FLAC)
536 ret = ff_flac_write_header(dyn_cp, codec, 1);
537 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
538 ret = put_wv_codecpriv(dyn_cp, codec);
539 else if (codec->codec_id == AV_CODEC_ID_H264)
540 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
541 else if (codec->codec_id == AV_CODEC_ID_HEVC)
542 ret = ff_isom_write_hvcc(dyn_cp, codec->extradata, codec->extradata_size, 0);
543 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
544 if (codec->extradata_size < 36) {
545 av_log(s, AV_LOG_ERROR,
546 "Invalid extradata found, ALAC expects a 36-byte "
548 ret = AVERROR_INVALIDDATA;
550 avio_write(dyn_cp, codec->extradata + 12,
551 codec->extradata_size - 12);
552 } else if (codec->codec_id == AV_CODEC_ID_PRORES &&
553 ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == AV_CODEC_ID_PRORES) {
554 avio_wl32(dyn_cp, codec->codec_tag);
556 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
557 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
558 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
560 if (!codec->codec_tag)
561 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
562 if (codec->extradata_size) {
563 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
564 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata+4)) != codec->codec_id
567 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
568 avio_wl32(dyn_cp, codec->codec_tag);
569 for(i=0; i<0x5a-8; i++)
572 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
575 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
576 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
577 avcodec_get_name(codec->codec_id));
579 if (!codec->codec_tag)
580 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
581 if (!codec->codec_tag) {
582 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
583 avcodec_get_name(codec->codec_id));
584 ret = AVERROR(EINVAL);
587 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
590 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
592 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
594 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
595 avcodec_get_name(codec->codec_id));
596 ret = AVERROR(EINVAL);
598 if (!codec->codec_tag)
599 codec->codec_tag = tag;
601 ff_put_wav_header(dyn_cp, codec, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
604 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
606 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
611 static int mkv_write_tracks(AVFormatContext *s)
613 MatroskaMuxContext *mkv = s->priv_data;
614 AVIOContext *pb = s->pb;
616 int i, j, ret, default_stream_exists = 0;
618 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
619 if (ret < 0) return ret;
621 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
622 for (i = 0; i < s->nb_streams; i++) {
623 AVStream *st = s->streams[i];
624 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
626 for (i = 0; i < s->nb_streams; i++) {
627 AVStream *st = s->streams[i];
628 AVCodecContext *codec = st->codec;
629 ebml_master subinfo, track;
632 int bit_depth = av_get_bits_per_sample(codec->codec_id);
633 int sample_rate = codec->sample_rate;
634 int output_sample_rate = 0;
635 int display_width_div = 1;
636 int display_height_div = 1;
637 AVDictionaryEntry *tag;
639 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
640 mkv->have_attachments = 1;
644 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
645 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
647 bit_depth = codec->bits_per_coded_sample;
649 if (codec->codec_id == AV_CODEC_ID_AAC)
650 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
652 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
653 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
654 mkv->is_dash ? mkv->dash_track_number : i + 1);
655 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
656 mkv->is_dash ? mkv->dash_track_number : i + 1);
657 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
659 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
660 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
661 tag = av_dict_get(st->metadata, "language", NULL, 0);
662 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
663 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
664 } else if (tag && tag->value) {
665 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
668 // The default value for TRACKFLAGDEFAULT is 1, so add element
669 // if we need to clear it.
670 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
671 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
673 if (st->disposition & AV_DISPOSITION_FORCED)
674 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
676 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
677 const char *codec_id;
678 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
679 codec_id = "D_WEBVTT/CAPTIONS";
680 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
681 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
682 codec_id = "D_WEBVTT/DESCRIPTIONS";
683 native_id = MATROSKA_TRACK_TYPE_METADATA;
684 } else if (st->disposition & AV_DISPOSITION_METADATA) {
685 codec_id = "D_WEBVTT/METADATA";
686 native_id = MATROSKA_TRACK_TYPE_METADATA;
688 codec_id = "D_WEBVTT/SUBTITLES";
689 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
691 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
693 // look for a codec ID string specific to mkv to use,
694 // if none are found, use AVI codes
695 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
696 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
697 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
704 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->delay && codec->codec_id == AV_CODEC_ID_OPUS) {
705 // mkv->tracks[i].ts_offset = av_rescale_q(codec->delay,
706 // (AVRational){ 1, codec->sample_rate },
709 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
710 av_rescale_q(codec->delay, (AVRational){ 1, codec->sample_rate },
711 (AVRational){ 1, 1000000000 }));
713 if (codec->codec_id == AV_CODEC_ID_OPUS) {
714 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
717 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
718 codec->codec_id == AV_CODEC_ID_VP9 ||
719 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
720 codec->codec_id == AV_CODEC_ID_VORBIS ||
721 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
722 av_log(s, AV_LOG_ERROR,
723 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
724 return AVERROR(EINVAL);
727 switch (codec->codec_type) {
728 case AVMEDIA_TYPE_VIDEO:
729 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
730 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
731 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
733 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
736 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
737 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
738 || codec->codec_id == AV_CODEC_ID_SVQ1
739 || codec->codec_id == AV_CODEC_ID_SVQ3
740 || codec->codec_id == AV_CODEC_ID_CINEPAK))
744 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
745 else if (!native_id) {
746 // if there is no mkv-specific codec ID, use VFW mode
747 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
748 mkv->tracks[i].write_dts = 1;
751 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
752 // XXX: interlace flag?
753 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
754 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
756 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
757 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
758 // save stereo mode flag
759 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
761 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
762 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
767 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
768 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
769 av_log(s, AV_LOG_ERROR,
770 "The specified stereo mode is not valid.\n");
771 return AVERROR(EINVAL);
773 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
780 display_width_div = 2;
786 display_height_div = 2;
791 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
792 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
793 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
794 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
797 if (st->sample_aspect_ratio.num) {
798 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
799 if (d_width > INT_MAX) {
800 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
801 return AVERROR(EINVAL);
803 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
804 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
805 } else if (display_width_div != 1 || display_height_div != 1) {
806 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
807 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
810 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
811 uint32_t color_space = av_le2ne32(codec->codec_tag);
812 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
814 end_ebml_master(pb, subinfo);
817 case AVMEDIA_TYPE_AUDIO:
818 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
821 // no mkv-specific ID, use ACM mode
822 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
824 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
825 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
826 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
827 if (output_sample_rate)
828 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
830 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
831 end_ebml_master(pb, subinfo);
834 case AVMEDIA_TYPE_SUBTITLE:
836 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
837 return AVERROR(ENOSYS);
840 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
841 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
843 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
846 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
847 return AVERROR(EINVAL);
850 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
851 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
852 if (ret < 0) return ret;
855 end_ebml_master(pb, track);
857 // ms precision is the de-facto standard timescale for mkv files
858 avpriv_set_pts_info(st, 64, 1, 1000);
860 end_ebml_master(pb, tracks);
864 static int mkv_write_chapters(AVFormatContext *s)
866 MatroskaMuxContext *mkv = s->priv_data;
867 AVIOContext *pb = s->pb;
868 ebml_master chapters, editionentry;
869 AVRational scale = {1, 1E9};
872 if (!s->nb_chapters || mkv->wrote_chapters)
875 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
876 if (ret < 0) return ret;
878 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
879 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
880 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
881 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
882 for (i = 0; i < s->nb_chapters; i++) {
883 ebml_master chapteratom, chapterdisplay;
884 AVChapter *c = s->chapters[i];
885 AVDictionaryEntry *t = NULL;
887 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
888 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
889 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
890 av_rescale_q(c->start, c->time_base, scale));
891 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
892 av_rescale_q(c->end, c->time_base, scale));
893 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
894 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
895 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
896 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
897 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
898 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
899 end_ebml_master(pb, chapterdisplay);
901 end_ebml_master(pb, chapteratom);
903 end_ebml_master(pb, editionentry);
904 end_ebml_master(pb, chapters);
906 mkv->wrote_chapters = 1;
910 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
912 uint8_t *key = av_strdup(t->key);
914 const uint8_t *lang = NULL;
917 if ((p = strrchr(p, '-')) &&
918 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
925 else if (*p >= 'a' && *p <= 'z')
930 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
931 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
933 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
934 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
935 end_ebml_master(pb, tag);
940 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
941 unsigned int uid, ebml_master *tags)
943 MatroskaMuxContext *mkv = s->priv_data;
944 ebml_master tag, targets;
945 AVDictionaryEntry *t = NULL;
949 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
950 if (ret < 0) return ret;
952 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
955 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
956 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
958 put_ebml_uint(s->pb, elementid, uid);
959 end_ebml_master(s->pb, targets);
961 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
962 if (av_strcasecmp(t->key, "title") &&
963 av_strcasecmp(t->key, "stereo_mode") &&
964 av_strcasecmp(t->key, "encoding_tool"))
965 mkv_write_simpletag(s->pb, t);
967 end_ebml_master(s->pb, tag);
971 static int mkv_check_tag(AVDictionary *m)
973 AVDictionaryEntry *t = NULL;
975 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
976 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
982 static int mkv_write_tags(AVFormatContext *s)
984 MatroskaMuxContext *mkv = s->priv_data;
985 ebml_master tags = {0};
988 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
990 if (mkv_check_tag(s->metadata)) {
991 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
992 if (ret < 0) return ret;
995 for (i = 0; i < s->nb_streams; i++) {
996 AVStream *st = s->streams[i];
998 if (!mkv_check_tag(st->metadata))
1001 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
1002 if (ret < 0) return ret;
1005 for (i = 0; i < s->nb_chapters; i++) {
1006 AVChapter *ch = s->chapters[i];
1008 if (!mkv_check_tag(ch->metadata))
1011 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
1012 if (ret < 0) return ret;
1016 end_ebml_master(s->pb, tags);
1020 static int mkv_write_attachments(AVFormatContext *s)
1022 MatroskaMuxContext *mkv = s->priv_data;
1023 AVIOContext *pb = s->pb;
1024 ebml_master attachments;
1028 if (!mkv->have_attachments)
1031 av_lfg_init(&c, av_get_random_seed());
1033 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1034 if (ret < 0) return ret;
1036 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1038 for (i = 0; i < s->nb_streams; i++) {
1039 AVStream *st = s->streams[i];
1040 ebml_master attached_file;
1041 AVDictionaryEntry *t;
1042 const char *mimetype = NULL;
1045 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1048 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1050 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1051 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1052 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1053 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1054 return AVERROR(EINVAL);
1056 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1057 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1058 mimetype = t->value;
1059 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1061 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1062 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1063 mimetype = ff_mkv_mime_tags[i].str;
1068 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1069 "it cannot be deduced from the codec id.\n", i);
1070 return AVERROR(EINVAL);
1073 if (s->flags & AVFMT_FLAG_BITEXACT) {
1074 struct AVSHA *sha = av_sha_alloc();
1077 return AVERROR(ENOMEM);
1078 av_sha_init(sha, 160);
1079 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1080 av_sha_final(sha, digest);
1082 fileuid = AV_RL64(digest);
1084 fileuid = av_lfg_get(&c);
1086 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1089 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1090 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1091 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1092 end_ebml_master(pb, attached_file);
1094 end_ebml_master(pb, attachments);
1099 static int mkv_write_header(AVFormatContext *s)
1101 MatroskaMuxContext *mkv = s->priv_data;
1102 AVIOContext *pb = s->pb;
1103 ebml_master ebml_header, segment_info;
1104 AVDictionaryEntry *tag;
1105 int ret, i, version = 2;
1107 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1108 else mkv->mode = MODE_MATROSKAv2;
1110 if (s->avoid_negative_ts < 0)
1111 s->avoid_negative_ts = 1;
1113 if (mkv->mode != MODE_WEBM ||
1114 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1115 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1118 for (i = 0; i < s->nb_streams; i++) {
1119 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1120 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1121 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1122 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1123 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1124 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1125 av_log(s, AV_LOG_ERROR,
1126 "The Matroska muxer does not yet support muxing %s\n",
1127 avcodec_get_name(s->streams[i]->codec->codec_id));
1128 return AVERROR_PATCHWELCOME;
1130 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_OPUS ||
1131 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1132 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1136 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1138 return AVERROR(ENOMEM);
1140 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1141 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1142 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1143 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1144 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1145 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1146 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1147 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1148 end_ebml_master(pb, ebml_header);
1150 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1151 mkv->segment_offset = avio_tell(pb);
1153 // we write 2 seek heads - one at the end of the file to point to each
1154 // cluster, and one at the beginning to point to all other level one
1155 // elements (including the seek head at the end of the file), which
1156 // isn't more than 10 elements if we only write one of each other
1157 // currently defined level 1 element
1158 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1159 if (!mkv->main_seekhead)
1160 return AVERROR(ENOMEM);
1162 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1163 if (ret < 0) return ret;
1165 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1166 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1167 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1168 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1169 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1170 uint32_t segment_uid[4];
1173 av_lfg_init(&lfg, av_get_random_seed());
1175 for (i = 0; i < 4; i++)
1176 segment_uid[i] = av_lfg_get(&lfg);
1178 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1179 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1180 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1182 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1183 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1185 const char *ident = "Lavf";
1186 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1187 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1190 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1191 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1192 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1193 uint8_t date_utc_buf[8];
1194 AV_WB64(date_utc_buf, date_utc);
1195 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1198 // reserve space for the duration
1200 mkv->duration_offset = avio_tell(pb);
1201 put_ebml_void(pb, 11); // assumes double-precision float to be written
1202 end_ebml_master(pb, segment_info);
1204 ret = mkv_write_tracks(s);
1205 if (ret < 0) return ret;
1207 for (i = 0; i < s->nb_chapters; i++)
1208 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1210 if (mkv->mode != MODE_WEBM) {
1211 ret = mkv_write_chapters(s);
1212 if (ret < 0) return ret;
1214 ret = mkv_write_tags(s);
1215 if (ret < 0) return ret;
1217 ret = mkv_write_attachments(s);
1218 if (ret < 0) return ret;
1221 if (!s->pb->seekable)
1222 mkv_write_seekhead(pb, mkv->main_seekhead);
1224 mkv->cues = mkv_start_cues(mkv->segment_offset);
1225 if (mkv->cues == NULL)
1226 return AVERROR(ENOMEM);
1228 if (pb->seekable && mkv->reserve_cues_space) {
1229 mkv->cues_pos = avio_tell(pb);
1230 put_ebml_void(pb, mkv->reserve_cues_space);
1233 av_init_packet(&mkv->cur_audio_pkt);
1234 mkv->cur_audio_pkt.size = 0;
1235 mkv->cluster_pos = -1;
1239 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1240 // after 4k and on a keyframe
1242 if (mkv->cluster_time_limit < 0)
1243 mkv->cluster_time_limit = 5000;
1244 if (mkv->cluster_size_limit < 0)
1245 mkv->cluster_size_limit = 5 * 1024 * 1024;
1247 if (mkv->cluster_time_limit < 0)
1248 mkv->cluster_time_limit = 1000;
1249 if (mkv->cluster_size_limit < 0)
1250 mkv->cluster_size_limit = 32 * 1024;
1256 static int mkv_blockgroup_size(int pkt_size)
1258 int size = pkt_size + 4;
1259 size += ebml_num_size(size);
1260 size += 2; // EBML ID for block and block duration
1261 size += 8; // max size of block duration
1262 size += ebml_num_size(size);
1263 size += 1; // blockgroup EBML ID
1267 static int ass_get_duration(const uint8_t *p)
1269 int sh, sm, ss, sc, eh, em, es, ec;
1270 uint64_t start, end;
1272 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1273 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1275 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1276 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1281 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1283 MatroskaMuxContext *mkv = s->priv_data;
1284 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1285 uint8_t *start, *end, *data = pkt->data;
1286 ebml_master blockgroup;
1290 int duration = ass_get_duration(data);
1291 max_duration = FFMAX(duration, max_duration);
1292 end = memchr(data, '\n', data_size);
1293 size = line_size = end ? end-data+1 : data_size;
1294 size -= end ? (end[-1]=='\r')+1 : 0;
1296 for (i=0; i<3; i++, start++)
1297 if (!(start = memchr(start, ',', size-(start-data))))
1298 return max_duration;
1299 size -= start - data;
1300 sscanf(data, "Dialogue: %d,", &layer);
1301 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1302 s->streams[pkt->stream_index]->nb_frames, layer);
1303 size = FFMIN(i+size, sizeof(buffer));
1304 memcpy(buffer+i, start, size-i);
1306 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1307 "pts %" PRId64 ", duration %d\n",
1308 avio_tell(pb), size, pkt->pts, duration);
1309 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1310 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1311 put_ebml_num(pb, size+4, 0);
1312 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1313 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1315 avio_write(pb, buffer, size);
1316 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1317 end_ebml_master(pb, blockgroup);
1320 data_size -= line_size;
1323 return max_duration;
1327 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1334 dst = av_malloc(srclen);
1336 return AVERROR(ENOMEM);
1338 while (srclen >= WV_HEADER_SIZE) {
1341 ret = ff_wv_parse_header(&header, src);
1344 src += WV_HEADER_SIZE;
1345 srclen -= WV_HEADER_SIZE;
1347 if (srclen < header.blocksize) {
1348 ret = AVERROR_INVALIDDATA;
1352 if (header.initial) {
1353 AV_WL32(dst + offset, header.samples);
1356 AV_WL32(dst + offset, header.flags);
1357 AV_WL32(dst + offset + 4, header.crc);
1360 if (!(header.initial && header.final)) {
1361 AV_WL32(dst + offset, header.blocksize);
1365 memcpy(dst + offset, src, header.blocksize);
1366 src += header.blocksize;
1367 srclen -= header.blocksize;
1368 offset += header.blocksize;
1380 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1381 unsigned int blockid, AVPacket *pkt, int flags)
1383 MatroskaMuxContext *mkv = s->priv_data;
1384 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1385 uint8_t *data = NULL, *side_data = NULL;
1386 int offset = 0, size = pkt->size, side_data_size = 0;
1387 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1388 uint64_t additional_id = 0;
1389 int64_t discard_padding = 0;
1390 ebml_master block_group, block_additions, block_more;
1392 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1393 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1394 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1395 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1396 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1397 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1398 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1399 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1400 /* extradata is Annex B, assume the bitstream is too and convert it */
1401 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1402 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1403 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1405 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1411 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1412 /* Matroska specification requires to remove the first QuickTime atom
1418 side_data = av_packet_get_side_data(pkt,
1419 AV_PKT_DATA_SKIP_SAMPLES,
1422 if (side_data && side_data_size >= 10) {
1423 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1424 (AVRational){1, codec->sample_rate},
1425 (AVRational){1, 1000000000});
1428 side_data = av_packet_get_side_data(pkt,
1429 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1432 additional_id = AV_RB64(side_data);
1434 side_data_size -= 8;
1437 if ((side_data_size && additional_id == 1) || discard_padding) {
1438 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1439 blockid = MATROSKA_ID_BLOCK;
1442 put_ebml_id(pb, blockid);
1443 put_ebml_num(pb, size+4, 0);
1444 // this assumes stream_index is less than 126
1445 avio_w8(pb, 0x80 | (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1)));
1446 avio_wb16(pb, ts - mkv->cluster_pts);
1448 avio_write(pb, data + offset, size);
1449 if (data != pkt->data)
1452 if (discard_padding) {
1453 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1456 if (side_data_size && additional_id == 1) {
1457 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1458 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1459 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1460 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1461 put_ebml_num(pb, side_data_size, 0);
1462 avio_write(pb, side_data, side_data_size);
1463 end_ebml_master(pb, block_more);
1464 end_ebml_master(pb, block_additions);
1466 if ((side_data_size && additional_id == 1) || discard_padding) {
1467 end_ebml_master(pb, block_group);
1471 static int srt_get_duration(uint8_t **buf)
1473 int i, duration = 0;
1475 for (i=0; i<2 && !duration; i++) {
1476 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1477 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1478 &s_hour, &s_min, &s_sec, &s_hsec,
1479 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1480 s_min += 60*s_hour; e_min += 60*e_hour;
1481 s_sec += 60*s_min; e_sec += 60*e_min;
1482 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1483 duration = e_hsec - s_hsec;
1485 *buf += ff_subtitles_next_line(*buf);
1490 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1492 ebml_master blockgroup;
1493 AVPacket pkt2 = *pkt;
1494 int64_t duration = srt_get_duration(&pkt2.data);
1495 pkt2.size -= pkt2.data - pkt->data;
1497 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1498 mkv_blockgroup_size(pkt2.size));
1499 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1500 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1501 end_ebml_master(pb, blockgroup);
1506 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1508 MatroskaMuxContext *mkv = s->priv_data;
1509 ebml_master blockgroup;
1510 int id_size, settings_size, size;
1511 uint8_t *id, *settings;
1512 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1513 const int flags = 0;
1516 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1520 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1523 size = id_size + 1 + settings_size + 1 + pkt->size;
1525 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1526 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1527 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1529 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1531 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1532 put_ebml_num(pb, size+4, 0);
1533 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1534 avio_wb16(pb, ts - mkv->cluster_pts);
1536 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1538 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1539 end_ebml_master(pb, blockgroup);
1541 return pkt->duration;
1544 static void mkv_flush_dynbuf(AVFormatContext *s)
1546 MatroskaMuxContext *mkv = s->priv_data;
1553 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1554 avio_write(s->pb, dyn_buf, bufsize);
1559 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
1561 MatroskaMuxContext *mkv = s->priv_data;
1562 AVIOContext *pb = s->pb;
1563 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1564 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1565 int duration = pkt->duration;
1567 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1568 int64_t relative_packet_pos;
1570 if (ts == AV_NOPTS_VALUE) {
1571 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1572 return AVERROR(EINVAL);
1574 ts += mkv->tracks[pkt->stream_index].ts_offset;
1576 if (!s->pb->seekable) {
1578 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1579 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1586 if (mkv->cluster_pos == -1) {
1587 mkv->cluster_pos = avio_tell(s->pb);
1588 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1589 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1590 mkv->cluster_pts = FFMAX(0, ts);
1593 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1595 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1596 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1598 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1599 duration = mkv_write_ass_blocks(s, pb, pkt);
1601 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1602 duration = mkv_write_srt_blocks(s, pb, pkt);
1603 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1604 duration = mkv_write_vtt_blocks(s, pb, pkt);
1606 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1607 /* For backward compatibility, prefer convergence_duration. */
1608 if (pkt->convergence_duration > 0) {
1609 duration = pkt->convergence_duration;
1611 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1612 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1613 end_ebml_master(pb, blockgroup);
1616 if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) ||
1617 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ||
1619 ret = mkv_add_cuepoint(mkv->cues,
1621 mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1,
1622 ts, mkv->cluster_pos, relative_packet_pos,
1623 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);
1624 if (ret < 0) return ret;
1627 mkv->duration = FFMAX(mkv->duration, ts + duration);
1631 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1633 MatroskaMuxContext *mkv = s->priv_data;
1634 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1635 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1637 int64_t cluster_time;
1640 int start_new_cluster;
1642 if (mkv->tracks[pkt->stream_index].write_dts)
1643 cluster_time = pkt->dts - mkv->cluster_pts;
1645 cluster_time = pkt->pts - mkv->cluster_pts;
1646 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1648 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1649 // after 4k and on a keyframe
1650 if (s->pb->seekable) {
1652 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1655 cluster_size = avio_tell(pb);
1658 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
1659 // WebM DASH specification states that the first block of every cluster
1660 // has to be a key frame. So for DASH video, we only create a cluster
1661 // on seeing key frames.
1662 start_new_cluster = keyframe;
1663 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
1664 cluster_time > mkv->cluster_time_limit) {
1665 // For DASH audio, we create a Cluster based on cluster_time_limit
1666 start_new_cluster = 1;
1667 } else if (!mkv->is_dash &&
1668 (cluster_size > mkv->cluster_size_limit ||
1669 cluster_time > mkv->cluster_time_limit ||
1670 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1671 cluster_size > 4 * 1024))) {
1672 start_new_cluster = 1;
1674 start_new_cluster = 0;
1677 if (mkv->cluster_pos != -1 && start_new_cluster) {
1678 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1679 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1680 avio_tell(pb), pkt->pts, pkt->dts);
1681 end_ebml_master(pb, mkv->cluster);
1682 mkv->cluster_pos = -1;
1684 mkv_flush_dynbuf(s);
1688 // check if we have an audio packet cached
1689 if (mkv->cur_audio_pkt.size > 0) {
1690 // for DASH audio, a CuePoint has to be added when there is a new cluster.
1691 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
1692 mkv->is_dash ? start_new_cluster : 0);
1693 av_free_packet(&mkv->cur_audio_pkt);
1695 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1700 // buffer an audio packet to ensure the packet containing the video
1701 // keyframe's timecode is contained in the same cluster for WebM
1702 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1703 mkv->cur_audio_pkt = *pkt;
1705 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1706 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1708 ret = av_dup_packet(&mkv->cur_audio_pkt);
1709 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1710 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1713 ret = mkv_write_packet_internal(s, pkt, 0);
1717 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1719 MatroskaMuxContext *mkv = s->priv_data;
1721 if (s->pb->seekable)
1726 if (mkv->cluster_pos != -1) {
1727 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1728 " bytes\n", avio_tell(pb));
1729 end_ebml_master(pb, mkv->cluster);
1730 mkv->cluster_pos = -1;
1732 mkv_flush_dynbuf(s);
1737 return mkv_write_packet(s, pkt);
1740 static int mkv_write_trailer(AVFormatContext *s)
1742 MatroskaMuxContext *mkv = s->priv_data;
1743 AVIOContext *pb = s->pb;
1744 int64_t currentpos, cuespos;
1747 // check if we have an audio packet cached
1748 if (mkv->cur_audio_pkt.size > 0) {
1749 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
1750 av_free_packet(&mkv->cur_audio_pkt);
1752 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1758 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1759 mkv_flush_dynbuf(s);
1760 } else if (mkv->cluster_pos != -1) {
1761 end_ebml_master(pb, mkv->cluster);
1764 if (mkv->mode != MODE_WEBM) {
1765 ret = mkv_write_chapters(s);
1766 if (ret < 0) return ret;
1770 if (mkv->cues->num_entries) {
1771 if (mkv->reserve_cues_space) {
1774 currentpos = avio_tell(pb);
1775 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1777 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1778 cues_end = avio_tell(pb);
1779 if (cues_end > cuespos + mkv->reserve_cues_space) {
1780 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1781 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1782 cues_end - cuespos);
1783 return AVERROR(EINVAL);
1786 if (cues_end < cuespos + mkv->reserve_cues_space)
1787 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1789 avio_seek(pb, currentpos, SEEK_SET);
1791 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1794 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1795 if (ret < 0) return ret;
1798 mkv_write_seekhead(pb, mkv->main_seekhead);
1800 // update the duration
1801 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1802 currentpos = avio_tell(pb);
1803 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1804 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1806 avio_seek(pb, currentpos, SEEK_SET);
1809 end_ebml_master(pb, mkv->segment);
1810 av_freep(&mkv->tracks);
1811 av_freep(&mkv->cues->entries);
1812 av_freep(&mkv->cues);
1817 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1820 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1821 if (ff_mkv_codec_tags[i].id == codec_id)
1824 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1825 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1826 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1833 static const AVCodecTag additional_audio_tags[] = {
1834 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1835 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1836 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1837 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1838 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1839 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1840 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1841 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1842 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1843 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1844 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1845 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1846 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1849 static const AVCodecTag additional_video_tags[] = {
1850 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1851 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1852 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1853 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1854 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1855 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1858 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1859 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1860 static const AVOption options[] = {
1861 { "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 },
1862 { "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 },
1863 { "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 },
1864 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
1865 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
1869 #if CONFIG_MATROSKA_MUXER
1870 static const AVClass matroska_class = {
1871 .class_name = "matroska muxer",
1872 .item_name = av_default_item_name,
1874 .version = LIBAVUTIL_VERSION_INT,
1877 AVOutputFormat ff_matroska_muxer = {
1879 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1880 .mime_type = "video/x-matroska",
1881 .extensions = "mkv",
1882 .priv_data_size = sizeof(MatroskaMuxContext),
1883 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1884 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1885 .video_codec = CONFIG_LIBX264_ENCODER ?
1886 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1887 .write_header = mkv_write_header,
1888 .write_packet = mkv_write_flush_packet,
1889 .write_trailer = mkv_write_trailer,
1890 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1891 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1892 .codec_tag = (const AVCodecTag* const []){
1893 ff_codec_bmp_tags, ff_codec_wav_tags,
1894 additional_audio_tags, additional_video_tags, 0
1897 .subtitle_codec = AV_CODEC_ID_SSA,
1899 .subtitle_codec = AV_CODEC_ID_ASS,
1901 .query_codec = mkv_query_codec,
1902 .priv_class = &matroska_class,
1906 #if CONFIG_WEBM_MUXER
1907 static const AVClass webm_class = {
1908 .class_name = "webm muxer",
1909 .item_name = av_default_item_name,
1911 .version = LIBAVUTIL_VERSION_INT,
1914 AVOutputFormat ff_webm_muxer = {
1916 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1917 .mime_type = "video/webm",
1918 .extensions = "webm",
1919 .priv_data_size = sizeof(MatroskaMuxContext),
1920 .audio_codec = AV_CODEC_ID_VORBIS,
1921 .video_codec = AV_CODEC_ID_VP8,
1922 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1923 .write_header = mkv_write_header,
1924 .write_packet = mkv_write_flush_packet,
1925 .write_trailer = mkv_write_trailer,
1926 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1927 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1928 .priv_class = &webm_class,
1932 #if CONFIG_MATROSKA_AUDIO_MUXER
1933 static const AVClass mka_class = {
1934 .class_name = "matroska audio muxer",
1935 .item_name = av_default_item_name,
1937 .version = LIBAVUTIL_VERSION_INT,
1939 AVOutputFormat ff_matroska_audio_muxer = {
1941 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1942 .mime_type = "audio/x-matroska",
1943 .extensions = "mka",
1944 .priv_data_size = sizeof(MatroskaMuxContext),
1945 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1946 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1947 .video_codec = AV_CODEC_ID_NONE,
1948 .write_header = mkv_write_header,
1949 .write_packet = mkv_write_flush_packet,
1950 .write_trailer = mkv_write_trailer,
1951 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1953 .codec_tag = (const AVCodecTag* const []){
1954 ff_codec_wav_tags, additional_audio_tags, 0
1956 .priv_class = &mka_class,