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
29 #include "avlanguage.h"
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/intfloat.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/random_seed.h"
35 #include "libavutil/lfg.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/avstring.h"
38 #include "libavcodec/xiph.h"
39 #include "libavcodec/mpeg4audio.h"
41 typedef struct ebml_master {
42 int64_t pos; ///< absolute offset in the file where the master's elements start
43 int sizebytes; ///< how many bytes were reserved for the size
46 typedef struct mkv_seekhead_entry {
47 unsigned int elementid;
51 typedef struct mkv_seekhead {
53 int64_t segment_offset; ///< the file offset to the beginning of the segment
54 int reserved_size; ///< -1 if appending to file
56 mkv_seekhead_entry *entries;
63 int64_t cluster_pos; ///< file offset of the cluster containing the block
67 int64_t segment_offset;
68 mkv_cuepoint *entries;
76 #define MODE_MATROSKAv2 0x01
77 #define MODE_WEBM 0x02
79 typedef struct MatroskaMuxContext {
83 int64_t segment_offset;
85 int64_t cluster_pos; ///< file offset of the current cluster
87 int64_t duration_offset;
89 mkv_seekhead *main_seekhead;
93 unsigned int audio_buffer_size;
94 AVPacket cur_audio_pkt;
100 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
101 * offset, 4 bytes for target EBML ID */
102 #define MAX_SEEKENTRY_SIZE 21
104 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
106 #define MAX_CUETRACKPOS_SIZE 22
108 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
109 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
112 static int ebml_id_size(unsigned int id)
114 return (av_log2(id+1)-1)/7+1;
117 static void put_ebml_id(AVIOContext *pb, unsigned int id)
119 int i = ebml_id_size(id);
121 avio_w8(pb, id >> (i*8));
125 * Write an EBML size meaning "unknown size".
127 * @param bytes The number of bytes the size should occupy (maximum: 8).
129 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
131 av_assert0(bytes <= 8);
132 avio_w8(pb, 0x1ff >> bytes);
138 * Calculate how many bytes are needed to represent a given number in EBML.
140 static int ebml_num_size(uint64_t num)
143 while ((num+1) >> bytes*7) bytes++;
148 * Write a number in EBML variable length format.
150 * @param bytes The number of bytes that need to be used to write the number.
151 * If zero, any number of bytes can be used.
153 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
155 int i, needed_bytes = ebml_num_size(num);
157 // sizes larger than this are currently undefined in EBML
158 av_assert0(num < (1ULL<<56)-1);
161 // don't care how many bytes are used, so use the min
162 bytes = needed_bytes;
163 // the bytes needed to write the given size would exceed the bytes
164 // that we need to use, so write unknown size. This shouldn't happen.
165 av_assert0(bytes >= needed_bytes);
167 num |= 1ULL << bytes*7;
168 for (i = bytes - 1; i >= 0; i--)
169 avio_w8(pb, num >> i*8);
172 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
176 while (tmp>>=8) bytes++;
178 put_ebml_id(pb, elementid);
179 put_ebml_num(pb, bytes, 0);
180 for (i = bytes - 1; i >= 0; i--)
181 avio_w8(pb, val >> i*8);
184 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
186 put_ebml_id(pb, elementid);
187 put_ebml_num(pb, 8, 0);
188 avio_wb64(pb, av_double2int(val));
191 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
192 const void *buf, int size)
194 put_ebml_id(pb, elementid);
195 put_ebml_num(pb, size, 0);
196 avio_write(pb, buf, size);
199 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
201 put_ebml_binary(pb, elementid, str, strlen(str));
205 * Write a void element of a given size. Useful for reserving space in
206 * the file to be written to later.
208 * @param size The number of bytes to reserve, which must be at least 2.
210 static void put_ebml_void(AVIOContext *pb, uint64_t size)
212 int64_t currentpos = avio_tell(pb);
214 av_assert0(size >= 2);
216 put_ebml_id(pb, EBML_ID_VOID);
217 // we need to subtract the length needed to store the size from the
218 // size we need to reserve so 2 cases, we use 8 bytes to store the
219 // size if possible, 1 byte otherwise
221 put_ebml_num(pb, size-1, 0);
223 put_ebml_num(pb, size-9, 8);
224 while(avio_tell(pb) < currentpos + size)
228 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
230 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
231 put_ebml_id(pb, elementid);
232 put_ebml_size_unknown(pb, bytes);
233 return (ebml_master){ avio_tell(pb), bytes };
236 static void end_ebml_master(AVIOContext *pb, ebml_master master)
238 int64_t pos = avio_tell(pb);
240 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
242 put_ebml_num(pb, pos - master.pos, master.sizebytes);
243 avio_seek(pb, pos, SEEK_SET);
246 static void put_xiph_size(AVIOContext *pb, int size)
249 for (i = 0; i < size / 255; i++)
251 avio_w8(pb, size % 255);
255 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
256 * elements. If a maximum number of elements is specified, enough space
257 * will be reserved at the current file location to write a seek head of
260 * @param segment_offset The absolute offset to the position in the file
261 * where the segment begins.
262 * @param numelements The maximum number of elements that will be indexed
263 * by this seek head, 0 if unlimited.
265 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
267 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
268 if (new_seekhead == NULL)
271 new_seekhead->segment_offset = segment_offset;
273 if (numelements > 0) {
274 new_seekhead->filepos = avio_tell(pb);
275 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
276 // and size, and 3 bytes to guarantee that an EBML void element
277 // will fit afterwards
278 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
279 new_seekhead->max_entries = numelements;
280 put_ebml_void(pb, new_seekhead->reserved_size);
285 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
287 mkv_seekhead_entry *entries = seekhead->entries;
289 // don't store more elements than we reserved space for
290 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
293 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
295 return AVERROR(ENOMEM);
297 entries[seekhead->num_entries ].elementid = elementid;
298 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
300 seekhead->entries = entries;
305 * Write the seek head to the file and free it. If a maximum number of
306 * elements was specified to mkv_start_seekhead(), the seek head will
307 * be written at the location reserved for it. Otherwise, it is written
308 * at the current location in the file.
310 * @return The file offset where the seekhead was written,
311 * -1 if an error occurred.
313 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
315 ebml_master metaseek, seekentry;
319 currentpos = avio_tell(pb);
321 if (seekhead->reserved_size > 0) {
322 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
328 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
329 for (i = 0; i < seekhead->num_entries; i++) {
330 mkv_seekhead_entry *entry = &seekhead->entries[i];
332 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
334 put_ebml_id(pb, MATROSKA_ID_SEEKID);
335 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
336 put_ebml_id(pb, entry->elementid);
338 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
339 end_ebml_master(pb, seekentry);
341 end_ebml_master(pb, metaseek);
343 if (seekhead->reserved_size > 0) {
344 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
345 put_ebml_void(pb, remaining);
346 avio_seek(pb, currentpos, SEEK_SET);
348 currentpos = seekhead->filepos;
351 av_free(seekhead->entries);
357 static mkv_cues * mkv_start_cues(int64_t segment_offset)
359 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
363 cues->segment_offset = segment_offset;
367 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
369 mkv_cuepoint *entries = cues->entries;
371 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
373 return AVERROR(ENOMEM);
378 entries[cues->num_entries ].pts = ts;
379 entries[cues->num_entries ].tracknum = stream + 1;
380 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
382 cues->entries = entries;
386 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
388 ebml_master cues_element;
392 currentpos = avio_tell(pb);
393 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
395 for (i = 0; i < cues->num_entries; i++) {
396 ebml_master cuepoint, track_positions;
397 mkv_cuepoint *entry = &cues->entries[i];
398 uint64_t pts = entry->pts;
400 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
401 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
403 // put all the entries from different tracks that have the exact same
404 // timestamp into the same CuePoint
405 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
406 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
407 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
408 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
409 end_ebml_master(pb, track_positions);
412 end_ebml_master(pb, cuepoint);
414 end_ebml_master(pb, cues_element);
419 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
421 uint8_t *header_start[3];
423 int first_header_size;
426 if (codec->codec_id == AV_CODEC_ID_VORBIS)
427 first_header_size = 30;
429 first_header_size = 42;
431 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
432 first_header_size, header_start, header_len) < 0) {
433 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
437 avio_w8(pb, 2); // number packets - 1
438 for (j = 0; j < 2; j++) {
439 put_xiph_size(pb, header_len[j]);
441 for (j = 0; j < 3; j++)
442 avio_write(pb, header_start[j], header_len[j]);
447 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
449 MPEG4AudioConfig mp4ac;
451 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
452 codec->extradata_size * 8, 1) < 0) {
453 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
457 *sample_rate = mp4ac.sample_rate;
458 *output_sample_rate = mp4ac.ext_sample_rate;
461 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
465 int ret, codecpriv_size;
467 ret = avio_open_dyn_buf(&dyn_cp);
472 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
473 ret = put_xiph_codecpriv(s, dyn_cp, codec);
474 else if (codec->codec_id == AV_CODEC_ID_FLAC)
475 ret = ff_flac_write_header(dyn_cp, codec, 1);
476 else if (codec->codec_id == AV_CODEC_ID_H264)
477 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
478 else if (codec->codec_id == AV_CODEC_ID_ALAC && (12 < codec->extradata_size))
479 ret = ff_isom_write_avcc(dyn_cp, codec->extradata + 12, codec->extradata_size - 12);
480 else if (codec->extradata_size)
481 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
482 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
484 if (!codec->codec_tag)
485 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
486 if (codec->extradata_size)
487 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
489 if (!codec->codec_tag)
490 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
491 if (!codec->codec_tag) {
492 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
496 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
499 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
501 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
503 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
506 if (!codec->codec_tag)
507 codec->codec_tag = tag;
509 ff_put_wav_header(dyn_cp, codec);
512 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
514 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
519 static int mkv_write_tracks(AVFormatContext *s)
521 MatroskaMuxContext *mkv = s->priv_data;
522 AVIOContext *pb = s->pb;
526 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
527 if (ret < 0) return ret;
529 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
530 for (i = 0; i < s->nb_streams; i++) {
531 AVStream *st = s->streams[i];
532 AVCodecContext *codec = st->codec;
533 ebml_master subinfo, track;
536 int bit_depth = av_get_bits_per_sample(codec->codec_id);
537 int sample_rate = codec->sample_rate;
538 int output_sample_rate = 0;
539 AVDictionaryEntry *tag;
541 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
542 mkv->have_attachments = 1;
547 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
549 if (codec->codec_id == AV_CODEC_ID_AAC)
550 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
552 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
553 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
554 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
555 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
557 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
558 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
559 tag = av_dict_get(st->metadata, "language", NULL, 0);
560 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
563 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
565 // look for a codec ID string specific to mkv to use,
566 // if none are found, use AVI codes
567 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
568 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
569 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
575 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
576 codec->codec_id == AV_CODEC_ID_VORBIS)) {
577 av_log(s, AV_LOG_ERROR,
578 "Only VP8 video and Vorbis audio are supported for WebM.\n");
579 return AVERROR(EINVAL);
582 switch (codec->codec_type) {
583 case AVMEDIA_TYPE_VIDEO:
584 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
585 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
586 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
588 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
591 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
592 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
593 || codec->codec_id == AV_CODEC_ID_SVQ1
594 || codec->codec_id == AV_CODEC_ID_SVQ3
595 || codec->codec_id == AV_CODEC_ID_CINEPAK))
599 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
600 else if (!native_id) {
601 // if there is no mkv-specific codec ID, use VFW mode
602 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
603 mkv->tracks[i].write_dts = 1;
606 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
607 // XXX: interlace flag?
608 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
609 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
611 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
612 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
613 // save stereo mode flag
614 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
616 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
617 if (!strcmp(tag->value, matroska_video_stereo_mode[j])){
622 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
623 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
624 av_log(s, AV_LOG_ERROR,
625 "The specified stereo mode is not valid.\n");
626 return AVERROR(EINVAL);
628 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
631 if (st->sample_aspect_ratio.num) {
632 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
633 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
634 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
635 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
638 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
639 uint32_t color_space = av_le2ne32(codec->codec_tag);
640 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
642 end_ebml_master(pb, subinfo);
645 case AVMEDIA_TYPE_AUDIO:
646 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
649 // no mkv-specific ID, use ACM mode
650 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
652 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
653 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
654 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
655 if (output_sample_rate)
656 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
658 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
659 end_ebml_master(pb, subinfo);
662 case AVMEDIA_TYPE_SUBTITLE:
663 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
665 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
666 return AVERROR(ENOSYS);
670 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
673 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
674 if (ret < 0) return ret;
676 end_ebml_master(pb, track);
678 // ms precision is the de-facto standard timescale for mkv files
679 avpriv_set_pts_info(st, 64, 1, 1000);
681 end_ebml_master(pb, tracks);
685 static int mkv_write_chapters(AVFormatContext *s)
687 MatroskaMuxContext *mkv = s->priv_data;
688 AVIOContext *pb = s->pb;
689 ebml_master chapters, editionentry;
690 AVRational scale = {1, 1E9};
696 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
697 if (ret < 0) return ret;
699 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
700 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
701 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
702 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
703 for (i = 0; i < s->nb_chapters; i++) {
704 ebml_master chapteratom, chapterdisplay;
705 AVChapter *c = s->chapters[i];
706 AVDictionaryEntry *t = NULL;
708 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
709 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
710 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
711 av_rescale_q(c->start, c->time_base, scale));
712 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
713 av_rescale_q(c->end, c->time_base, scale));
714 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
715 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
716 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
717 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
718 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
719 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
720 end_ebml_master(pb, chapterdisplay);
722 end_ebml_master(pb, chapteratom);
724 end_ebml_master(pb, editionentry);
725 end_ebml_master(pb, chapters);
729 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
731 uint8_t *key = av_strdup(t->key);
733 const uint8_t *lang = NULL;
736 if ((p = strrchr(p, '-')) &&
737 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
744 else if (*p >= 'a' && *p <= 'z')
749 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
750 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
752 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
753 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
754 end_ebml_master(pb, tag);
759 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
760 unsigned int uid, ebml_master *tags)
762 MatroskaMuxContext *mkv = s->priv_data;
763 ebml_master tag, targets;
764 AVDictionaryEntry *t = NULL;
768 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
769 if (ret < 0) return ret;
771 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
774 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
775 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
777 put_ebml_uint(s->pb, elementid, uid);
778 end_ebml_master(s->pb, targets);
780 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
781 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
782 mkv_write_simpletag(s->pb, t);
784 end_ebml_master(s->pb, tag);
788 static int mkv_write_tags(AVFormatContext *s)
790 ebml_master tags = {0};
793 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
795 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
796 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
797 if (ret < 0) return ret;
800 for (i = 0; i < s->nb_streams; i++) {
801 AVStream *st = s->streams[i];
803 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
806 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
807 if (ret < 0) return ret;
810 for (i = 0; i < s->nb_chapters; i++) {
811 AVChapter *ch = s->chapters[i];
813 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
816 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
817 if (ret < 0) return ret;
821 end_ebml_master(s->pb, tags);
825 static int mkv_write_attachments(AVFormatContext *s)
827 MatroskaMuxContext *mkv = s->priv_data;
828 AVIOContext *pb = s->pb;
829 ebml_master attachments;
833 if (!mkv->have_attachments)
836 av_lfg_init(&c, av_get_random_seed());
838 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
839 if (ret < 0) return ret;
841 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
843 for (i = 0; i < s->nb_streams; i++) {
844 AVStream *st = s->streams[i];
845 ebml_master attached_file;
846 AVDictionaryEntry *t;
847 const char *mimetype = NULL;
849 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
852 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
854 if (t = av_dict_get(st->metadata, "title", NULL, 0))
855 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
856 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
857 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
858 return AVERROR(EINVAL);
860 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
861 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
863 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
865 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
866 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
867 mimetype = ff_mkv_mime_tags[i].str;
872 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
873 "it cannot be deduced from the codec id.\n", i);
874 return AVERROR(EINVAL);
877 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
878 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
879 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
880 end_ebml_master(pb, attached_file);
882 end_ebml_master(pb, attachments);
887 static int mkv_write_header(AVFormatContext *s)
889 MatroskaMuxContext *mkv = s->priv_data;
890 AVIOContext *pb = s->pb;
891 ebml_master ebml_header, segment_info;
892 AVDictionaryEntry *tag;
895 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
896 else mkv->mode = MODE_MATROSKAv2;
898 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
900 return AVERROR(ENOMEM);
902 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
903 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
904 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
905 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
906 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
907 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
908 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
909 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
910 end_ebml_master(pb, ebml_header);
912 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
913 mkv->segment_offset = avio_tell(pb);
915 // we write 2 seek heads - one at the end of the file to point to each
916 // cluster, and one at the beginning to point to all other level one
917 // elements (including the seek head at the end of the file), which
918 // isn't more than 10 elements if we only write one of each other
919 // currently defined level 1 element
920 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
921 if (!mkv->main_seekhead)
922 return AVERROR(ENOMEM);
924 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
925 if (ret < 0) return ret;
927 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
928 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
929 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
930 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
931 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
932 uint32_t segment_uid[4];
935 av_lfg_init(&lfg, av_get_random_seed());
937 for (i = 0; i < 4; i++)
938 segment_uid[i] = av_lfg_get(&lfg);
940 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
941 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
942 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
945 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
946 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
947 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
948 uint8_t date_utc_buf[8];
949 AV_WB64(date_utc_buf, date_utc);
950 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
953 // reserve space for the duration
955 mkv->duration_offset = avio_tell(pb);
956 put_ebml_void(pb, 11); // assumes double-precision float to be written
957 end_ebml_master(pb, segment_info);
959 ret = mkv_write_tracks(s);
960 if (ret < 0) return ret;
962 if (mkv->mode != MODE_WEBM) {
963 ret = mkv_write_chapters(s);
964 if (ret < 0) return ret;
966 ret = mkv_write_tags(s);
967 if (ret < 0) return ret;
969 ret = mkv_write_attachments(s);
970 if (ret < 0) return ret;
973 if (!s->pb->seekable)
974 mkv_write_seekhead(pb, mkv->main_seekhead);
976 mkv->cues = mkv_start_cues(mkv->segment_offset);
977 if (mkv->cues == NULL)
978 return AVERROR(ENOMEM);
980 av_init_packet(&mkv->cur_audio_pkt);
981 mkv->cur_audio_pkt.size = 0;
982 mkv->audio_buffer_size = 0;
983 mkv->cluster_pos = -1;
989 static int mkv_blockgroup_size(int pkt_size)
991 int size = pkt_size + 4;
992 size += ebml_num_size(size);
993 size += 2; // EBML ID for block and block duration
994 size += 8; // max size of block duration
995 size += ebml_num_size(size);
996 size += 1; // blockgroup EBML ID
1000 static int ass_get_duration(const uint8_t *p)
1002 int sh, sm, ss, sc, eh, em, es, ec;
1003 uint64_t start, end;
1005 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1006 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1008 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1009 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1013 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1015 MatroskaMuxContext *mkv = s->priv_data;
1016 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1017 uint8_t *start, *end, *data = pkt->data;
1018 ebml_master blockgroup;
1022 int duration = ass_get_duration(data);
1023 max_duration = FFMAX(duration, max_duration);
1024 end = memchr(data, '\n', data_size);
1025 size = line_size = end ? end-data+1 : data_size;
1026 size -= end ? (end[-1]=='\r')+1 : 0;
1028 for (i=0; i<3; i++, start++)
1029 if (!(start = memchr(start, ',', size-(start-data))))
1030 return max_duration;
1031 size -= start - data;
1032 sscanf(data, "Dialogue: %d,", &layer);
1033 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1034 s->streams[pkt->stream_index]->nb_frames, layer);
1035 size = FFMIN(i+size, sizeof(buffer));
1036 memcpy(buffer+i, start, size-i);
1038 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1039 "pts %" PRId64 ", duration %d\n",
1040 avio_tell(pb), size, pkt->pts, duration);
1041 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1042 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1043 put_ebml_num(pb, size+4, 0);
1044 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1045 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1047 avio_write(pb, buffer, size);
1048 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1049 end_ebml_master(pb, blockgroup);
1052 data_size -= line_size;
1055 return max_duration;
1058 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1059 unsigned int blockid, AVPacket *pkt, int flags)
1061 MatroskaMuxContext *mkv = s->priv_data;
1062 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1063 uint8_t *data = NULL;
1064 int size = pkt->size;
1065 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1067 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1068 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1069 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1070 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1071 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1072 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1075 put_ebml_id(pb, blockid);
1076 put_ebml_num(pb, size+4, 0);
1077 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1078 avio_wb16(pb, ts - mkv->cluster_pts);
1080 avio_write(pb, data, size);
1081 if (data != pkt->data)
1085 static int srt_get_duration(uint8_t **buf)
1087 int i, duration = 0;
1089 for (i=0; i<2 && !duration; i++) {
1090 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1091 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1092 &s_hour, &s_min, &s_sec, &s_hsec,
1093 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1094 s_min += 60*s_hour; e_min += 60*e_hour;
1095 s_sec += 60*s_min; e_sec += 60*e_min;
1096 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1097 duration = e_hsec - s_hsec;
1099 *buf += strcspn(*buf, "\n") + 1;
1104 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1106 ebml_master blockgroup;
1107 AVPacket pkt2 = *pkt;
1108 int64_t duration = srt_get_duration(&pkt2.data);
1109 pkt2.size -= pkt2.data - pkt->data;
1111 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1112 mkv_blockgroup_size(pkt2.size));
1113 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1114 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1115 end_ebml_master(pb, blockgroup);
1120 static void mkv_flush_dynbuf(AVFormatContext *s)
1122 MatroskaMuxContext *mkv = s->priv_data;
1129 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1130 avio_write(s->pb, dyn_buf, bufsize);
1135 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1137 MatroskaMuxContext *mkv = s->priv_data;
1138 AVIOContext *pb = s->pb;
1139 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1140 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1141 int duration = pkt->duration;
1143 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1145 if (ts == AV_NOPTS_VALUE) {
1146 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1147 return AVERROR(EINVAL);
1150 if (!s->pb->seekable) {
1152 avio_open_dyn_buf(&mkv->dyn_bc);
1156 if (mkv->cluster_pos == -1) {
1157 mkv->cluster_pos = avio_tell(s->pb);
1158 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1159 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1160 mkv->cluster_pts = FFMAX(0, ts);
1163 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1164 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1165 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1166 duration = mkv_write_ass_blocks(s, pb, pkt);
1167 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1168 duration = mkv_write_srt_blocks(s, pb, pkt);
1170 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1171 duration = pkt->convergence_duration;
1172 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1173 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1174 end_ebml_master(pb, blockgroup);
1177 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1178 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1179 if (ret < 0) return ret;
1182 mkv->duration = FFMAX(mkv->duration, ts + duration);
1186 static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
1188 uint8_t *data = mkv->cur_audio_pkt.data;
1189 mkv->cur_audio_pkt = *pkt;
1190 mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
1191 if (!mkv->cur_audio_pkt.data)
1192 return AVERROR(ENOMEM);
1194 memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
1195 mkv->cur_audio_pkt.size = pkt->size;
1199 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1201 MatroskaMuxContext *mkv = s->priv_data;
1202 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1203 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1204 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1205 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1206 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1208 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1209 // after 4k and on a keyframe
1210 if (mkv->cluster_pos != -1 &&
1211 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1212 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1213 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1214 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1215 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1216 end_ebml_master(pb, mkv->cluster);
1217 mkv->cluster_pos = -1;
1219 mkv_flush_dynbuf(s);
1222 // check if we have an audio packet cached
1223 if (mkv->cur_audio_pkt.size > 0) {
1224 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1225 mkv->cur_audio_pkt.size = 0;
1227 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1232 // buffer an audio packet to ensure the packet containing the video
1233 // keyframe's timecode is contained in the same cluster for WebM
1234 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
1235 ret = mkv_copy_packet(mkv, pkt);
1237 ret = mkv_write_packet_internal(s, pkt);
1241 static int mkv_write_trailer(AVFormatContext *s)
1243 MatroskaMuxContext *mkv = s->priv_data;
1244 AVIOContext *pb = s->pb;
1245 int64_t currentpos, cuespos;
1248 // check if we have an audio packet cached
1249 if (mkv->cur_audio_pkt.size > 0) {
1250 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1251 mkv->cur_audio_pkt.size = 0;
1253 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1259 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1260 mkv_flush_dynbuf(s);
1261 } else if (mkv->cluster_pos != -1) {
1262 end_ebml_master(pb, mkv->cluster);
1266 if (mkv->cues->num_entries) {
1267 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1269 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1270 if (ret < 0) return ret;
1273 mkv_write_seekhead(pb, mkv->main_seekhead);
1275 // update the duration
1276 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1277 currentpos = avio_tell(pb);
1278 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1279 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1281 avio_seek(pb, currentpos, SEEK_SET);
1284 end_ebml_master(pb, mkv->segment);
1285 av_free(mkv->tracks);
1286 av_freep(&mkv->cues->entries);
1287 av_freep(&mkv->cues);
1288 av_destruct_packet(&mkv->cur_audio_pkt);
1293 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1296 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1297 if (ff_mkv_codec_tags[i].id == codec_id)
1300 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1301 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1302 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1309 #if CONFIG_MATROSKA_MUXER
1310 AVOutputFormat ff_matroska_muxer = {
1312 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1313 .mime_type = "video/x-matroska",
1314 .extensions = "mkv",
1315 .priv_data_size = sizeof(MatroskaMuxContext),
1316 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1317 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1318 .video_codec = CONFIG_LIBX264_ENCODER ?
1319 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1320 .write_header = mkv_write_header,
1321 .write_packet = mkv_write_packet,
1322 .write_trailer = mkv_write_trailer,
1323 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1325 .subtitle_codec = AV_CODEC_ID_SSA,
1326 .query_codec = mkv_query_codec,
1330 #if CONFIG_WEBM_MUXER
1331 AVOutputFormat ff_webm_muxer = {
1333 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1334 .mime_type = "video/webm",
1335 .extensions = "webm",
1336 .priv_data_size = sizeof(MatroskaMuxContext),
1337 .audio_codec = AV_CODEC_ID_VORBIS,
1338 .video_codec = AV_CODEC_ID_VP8,
1339 .write_header = mkv_write_header,
1340 .write_packet = mkv_write_packet,
1341 .write_trailer = mkv_write_trailer,
1342 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1347 #if CONFIG_MATROSKA_AUDIO_MUXER
1348 AVOutputFormat ff_matroska_audio_muxer = {
1350 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1351 .mime_type = "audio/x-matroska",
1352 .extensions = "mka",
1353 .priv_data_size = sizeof(MatroskaMuxContext),
1354 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1355 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1356 .video_codec = AV_CODEC_ID_NONE,
1357 .write_header = mkv_write_header,
1358 .write_packet = mkv_write_packet,
1359 .write_trailer = mkv_write_trailer,
1360 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,