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
28 typedef struct mkv_seekhead_entry {
29 unsigned int elementid;
33 typedef struct mkv_seekhead {
35 offset_t segment_offset; ///< the file offset to the beginning of the segment
36 int reserved_size; ///< -1 if appending to file
38 mkv_seekhead_entry *entries;
45 offset_t cluster_pos; ///< file offset of the cluster containing the block
49 offset_t segment_offset;
50 mkv_cuepoint *entries;
54 typedef struct MatroskaMuxContext {
56 offset_t segment_offset;
59 offset_t cluster_pos; ///< file offset of the current cluster
61 offset_t duration_offset;
63 mkv_seekhead *main_seekhead;
64 mkv_seekhead *cluster_seekhead;
67 struct AVMD5 *md5_ctx;
70 static void put_ebml_id(ByteIOContext *pb, unsigned int id)
73 put_byte(pb, id >> 24);
75 put_byte(pb, id >> 16);
77 put_byte(pb, id >> 8);
81 static int ebml_id_size(unsigned int id)
83 return (av_log2(id+1)-1)/7+1;
87 * Write an EBML size meaning "unknown size"
89 * @param bytes The number of bytes the size should occupy. Maximum of 8.
91 static void put_ebml_size_unknown(ByteIOContext *pb, int bytes)
96 bytes = FFMIN(bytes, 8);
97 for (i = 0; i < bytes*7 + 1; i++)
99 for (i = bytes-1; i >= 0; i--)
100 put_byte(pb, value >> i*8);
103 // XXX: test this thoroughly and get rid of minbytes hack (currently needed to
104 // use up all of the space reserved in start_ebml_master)
105 static void put_ebml_size(ByteIOContext *pb, uint64_t size, int minbytes)
107 int bytes = minbytes;
109 // sizes larger than this are currently undefined in EBML
110 // so write "unknown" size
111 if (size >= (1ULL<<56)-1) {
112 put_ebml_size_unknown(pb, 1);
116 while ((size+1) >> (bytes*7 + 7)) bytes++;
118 put_byte(pb, (0x80 >> bytes) | (size >> bytes*8));
119 for (bytes -= 1; bytes >= 0; bytes--)
120 put_byte(pb, size >> bytes*8);
123 static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
126 while (val >> bytes*8) bytes++;
128 put_ebml_id(pb, elementid);
129 put_ebml_size(pb, bytes, 0);
130 for (bytes -= 1; bytes >= 0; bytes--)
131 put_byte(pb, val >> bytes*8);
134 static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
136 put_ebml_id(pb, elementid);
137 put_ebml_size(pb, 8, 0);
138 put_be64(pb, av_dbl2int(val));
141 static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
142 const uint8_t *buf, int size)
144 put_ebml_id(pb, elementid);
145 put_ebml_size(pb, size, 0);
146 put_buffer(pb, buf, size);
149 static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str)
151 put_ebml_binary(pb, elementid, str, strlen(str));
155 * Writes a void element of a given size. Useful for reserving space in the file to be
158 * @param size The amount of space to reserve, which must be at least 2.
160 static void put_ebml_void(ByteIOContext *pb, uint64_t size)
162 offset_t currentpos = url_ftell(pb);
167 put_ebml_id(pb, EBML_ID_VOID);
168 // we need to subtract the length needed to store the size from the size we need to reserve
169 // so 2 cases, we use 8 bytes to store the size if possible, 1 byte otherwise
171 put_ebml_size(pb, size-1, 0);
173 put_ebml_size(pb, size-9, 7);
174 url_fseek(pb, currentpos + size, SEEK_SET);
177 static offset_t start_ebml_master(ByteIOContext *pb, unsigned int elementid)
179 put_ebml_id(pb, elementid);
180 // XXX: this always reserves the maximum needed space to store any size value
181 // we should be smarter (additional parameter for expected size?)
182 put_ebml_size_unknown(pb, 8);
183 return url_ftell(pb);
186 static void end_ebml_master(ByteIOContext *pb, offset_t start)
188 offset_t pos = url_ftell(pb);
190 url_fseek(pb, start - 8, SEEK_SET);
191 put_ebml_size(pb, pos - start, 7);
192 url_fseek(pb, pos, SEEK_SET);
195 static void put_xiph_size(ByteIOContext *pb, int size)
198 for (i = 0; i < size / 255; i++)
200 put_byte(pb, size % 255);
204 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska elements.
205 * If a maximum number of elements is specified, enough space will be reserved at
206 * the current file location to write a seek head of that size.
208 * @param segment_offset the absolute offset into the file that the segment begins
209 * @param numelements the maximum number of elements that will be indexed by this
210 * seek head, 0 if unlimited.
212 static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements)
214 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
215 if (new_seekhead == NULL)
218 new_seekhead->segment_offset = segment_offset;
220 if (numelements > 0) {
221 new_seekhead->filepos = url_ftell(pb);
222 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID and size,
223 // and 3 bytes to guarantee that an EBML void element will fit afterwards
224 // XXX: 28 bytes right now because begin_ebml_master() reserves more than necessary
225 new_seekhead->reserved_size = numelements * 28 + 13;
226 new_seekhead->max_entries = numelements;
227 put_ebml_void(pb, new_seekhead->reserved_size);
232 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
234 mkv_seekhead_entry *entries = seekhead->entries;
235 int new_entry = seekhead->num_entries;
237 // don't store more elements than we reserved space for
238 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
241 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
245 entries[new_entry].elementid = elementid;
246 entries[new_entry].segmentpos = filepos - seekhead->segment_offset;
248 seekhead->entries = entries;
249 seekhead->num_entries++;
255 * Write the seek head to the file and free it. If a maximum number of elements was
256 * specified to mkv_start_seekhead(), the seek head will be written at the location
257 * reserved for it. Otherwise, it is written at the current location in the file.
259 * @return the file offset where the seekhead was written
261 static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
263 offset_t metaseek, seekentry, currentpos;
266 currentpos = url_ftell(pb);
268 if (seekhead->reserved_size > 0)
269 url_fseek(pb, seekhead->filepos, SEEK_SET);
271 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD);
272 for (i = 0; i < seekhead->num_entries; i++) {
273 mkv_seekhead_entry *entry = &seekhead->entries[i];
275 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY);
277 put_ebml_id(pb, MATROSKA_ID_SEEKID);
278 put_ebml_size(pb, ebml_id_size(entry->elementid), 0);
279 put_ebml_id(pb, entry->elementid);
281 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
282 end_ebml_master(pb, seekentry);
284 end_ebml_master(pb, metaseek);
286 if (seekhead->reserved_size > 0) {
287 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb);
288 put_ebml_void(pb, remaining);
289 url_fseek(pb, currentpos, SEEK_SET);
291 currentpos = seekhead->filepos;
293 av_free(seekhead->entries);
299 static mkv_cues * mkv_start_cues(offset_t segment_offset)
301 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
305 cues->segment_offset = segment_offset;
309 static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, offset_t cluster_pos)
311 mkv_cuepoint *entries = cues->entries;
312 int new_entry = cues->num_entries;
314 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
318 entries[new_entry].pts = pkt->pts;
319 entries[new_entry].tracknum = pkt->stream_index + 1;
320 entries[new_entry].cluster_pos = cluster_pos - cues->segment_offset;
322 cues->entries = entries;
327 static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues)
329 offset_t currentpos, cues_element;
332 currentpos = url_ftell(pb);
333 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES);
335 for (i = 0; i < cues->num_entries; i++) {
336 offset_t cuepoint, track_positions;
337 mkv_cuepoint *entry = &cues->entries[i];
338 uint64_t pts = entry->pts;
340 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY);
341 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
343 // put all the entries from different tracks that have the exact same
344 // timestamp into the same CuePoint
345 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
346 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION);
347 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
348 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
349 end_ebml_master(pb, track_positions);
352 end_ebml_master(pb, cuepoint);
354 end_ebml_master(pb, cues_element);
356 av_free(cues->entries);
361 static int put_xiph_codecpriv(ByteIOContext *pb, AVCodecContext *codec)
363 offset_t codecprivate;
364 uint8_t *header_start[3];
366 int first_header_size;
369 if (codec->codec_id == CODEC_ID_VORBIS)
370 first_header_size = 30;
372 first_header_size = 42;
374 if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
375 first_header_size, header_start, header_len) < 0) {
376 av_log(codec, AV_LOG_ERROR, "Extradata corrupt.\n");
380 codecprivate = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
381 put_byte(pb, 2); // number packets - 1
382 for (j = 0; j < 2; j++) {
383 put_xiph_size(pb, header_len[j]);
385 for (j = 0; j < 3; j++)
386 put_buffer(pb, header_start[j], header_len[j]);
387 end_ebml_master(pb, codecprivate);
392 #define FLAC_STREAMINFO_SIZE 34
394 static int put_flac_codecpriv(ByteIOContext *pb, AVCodecContext *codec)
396 offset_t codecpriv = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
398 // if the extradata_size is greater than FLAC_STREAMINFO_SIZE,
399 // assume that it's in Matroska's format already
400 if (codec->extradata_size < FLAC_STREAMINFO_SIZE) {
401 av_log(codec, AV_LOG_ERROR, "Invalid FLAC extradata\n");
403 } else if (codec->extradata_size == FLAC_STREAMINFO_SIZE) {
404 // only the streaminfo packet
406 put_xiph_size(pb, codec->extradata_size);
407 av_log(codec, AV_LOG_ERROR, "Only one packet\n");
409 put_buffer(pb, codec->extradata, codec->extradata_size);
410 end_ebml_master(pb, codecpriv);
414 static void get_aac_sample_rates(AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
416 static const int aac_sample_rates[] = {
417 96000, 88200, 64000, 48000, 44100, 32000,
418 24000, 22050, 16000, 12000, 11025, 8000,
422 if (codec->extradata_size < 2) {
423 av_log(codec, AV_LOG_WARNING, "no aac extradata, unable to determine sample rate\n");
427 sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
429 av_log(codec, AV_LOG_WARNING, "aac samplerate index out of bounds\n");
432 *sample_rate = aac_sample_rates[sri];
434 // if sbr, get output sample rate as well
435 if (codec->extradata_size == 5) {
436 sri = (codec->extradata[4] >> 3) & 0xF;
438 av_log(codec, AV_LOG_WARNING, "aac output samplerate index out of bounds\n");
441 *output_sample_rate = aac_sample_rates[sri];
445 static int mkv_write_tracks(AVFormatContext *s)
447 MatroskaMuxContext *mkv = s->priv_data;
448 ByteIOContext *pb = &s->pb;
452 if (mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb)) < 0)
455 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS);
456 for (i = 0; i < s->nb_streams; i++) {
457 AVStream *st = s->streams[i];
458 AVCodecContext *codec = st->codec;
459 offset_t subinfo, track;
461 int bit_depth = av_get_bits_per_sample(codec->codec_id);
462 int sample_rate = codec->sample_rate;
463 int output_sample_rate = 0;
465 if (codec->codec_id == CODEC_ID_AAC)
466 get_aac_sample_rates(codec, &sample_rate, &output_sample_rate);
468 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY);
469 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
470 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
471 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
474 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, st->language);
476 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, "und");
478 // look for a codec id string specific to mkv to use, if none are found, use AVI codes
479 for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
480 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
481 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
488 if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) {
489 if (put_xiph_codecpriv(pb, codec) < 0)
491 } else if (codec->codec_id == CODEC_ID_FLAC) {
492 if (put_flac_codecpriv(pb, codec) < 0)
494 } else if (codec->extradata_size) {
495 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codec->extradata, codec->extradata_size);
499 switch (codec->codec_type) {
500 case CODEC_TYPE_VIDEO:
501 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
505 // if there is no mkv-specific codec id, use VFW mode
506 if (!codec->codec_tag)
507 codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
509 put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC);
510 bmp_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
511 put_bmp_header(pb, codec, codec_bmp_tags, 0);
512 end_ebml_master(pb, bmp_header);
514 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO);
515 // XXX: interlace flag?
516 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
517 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
518 if (codec->sample_aspect_ratio.num) {
519 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->sample_aspect_ratio.num);
520 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->sample_aspect_ratio.den);
522 end_ebml_master(pb, subinfo);
525 case CODEC_TYPE_AUDIO:
526 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
530 // no mkv-specific ID, use ACM mode
531 codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id);
532 if (!codec->codec_tag) {
533 av_log(s, AV_LOG_ERROR, "no codec id found for stream %d", i);
537 put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_AUDIO_ACM);
538 wav_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
539 put_wav_header(pb, codec);
540 end_ebml_master(pb, wav_header);
542 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO);
543 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
544 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
545 if (output_sample_rate)
546 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
548 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
549 end_ebml_master(pb, subinfo);
552 case CODEC_TYPE_SUBTITLE:
553 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
556 av_log(s, AV_LOG_ERROR, "Only audio and video are supported for Matroska.");
559 end_ebml_master(pb, track);
561 // ms precision is the de-facto standard timescale for mkv files
562 av_set_pts_info(st, 64, 1, 1000);
564 end_ebml_master(pb, tracks);
568 static int mkv_write_header(AVFormatContext *s)
570 MatroskaMuxContext *mkv = s->priv_data;
571 ByteIOContext *pb = &s->pb;
572 offset_t ebml_header, segment_info;
574 mkv->md5_ctx = av_mallocz(av_md5_size);
575 av_md5_init(mkv->md5_ctx);
577 ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
578 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
579 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
580 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
581 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
582 put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska");
583 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
584 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
585 end_ebml_master(pb, ebml_header);
587 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT);
588 mkv->segment_offset = url_ftell(pb);
590 // we write 2 seek heads - one at the end of the file to point to each cluster, and
591 // one at the beginning to point to all other level one elements (including the seek
592 // head at the end of the file), which isn't more than 10 elements if we only write one
593 // of each other currently defined level 1 element
594 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
595 mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
597 if (mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb)) < 0)
600 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO);
601 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
602 if (strlen(s->title))
603 put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
604 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
605 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
606 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
608 // reserve space to write the segment UID later
609 mkv->segment_uid = url_ftell(pb);
610 put_ebml_void(pb, 19);
613 // reserve space for the duration
615 mkv->duration_offset = url_ftell(pb);
616 put_ebml_void(pb, 11); // assumes double-precision float to be written
617 end_ebml_master(pb, segment_info);
619 if (mkv_write_tracks(s) < 0)
622 if (mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)) < 0)
625 mkv->cluster_pos = url_ftell(pb);
626 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
627 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
628 mkv->cluster_pts = 0;
630 mkv->cues = mkv_start_cues(mkv->segment_offset);
631 if (mkv->cues == NULL)
637 static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
639 MatroskaMuxContext *mkv = s->priv_data;
640 ByteIOContext *pb = &s->pb;
642 av_log(s, AV_LOG_DEBUG, "Writing block at offset %llu, size %d, pts %lld, dts %lld, duration %d, flags %d\n",
643 url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
644 put_ebml_id(pb, blockid);
645 put_ebml_size(pb, pkt->size + 4, 0);
646 put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
647 put_be16(pb, pkt->pts - mkv->cluster_pts);
649 put_buffer(pb, pkt->data, pkt->size);
652 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
654 MatroskaMuxContext *mkv = s->priv_data;
655 ByteIOContext *pb = &s->pb;
656 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
657 int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
659 // start a new cluster every 5 MB or 5 sec
660 if (url_ftell(pb) > mkv->cluster + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
661 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %llu bytes, pts %llu\n", url_ftell(pb), pkt->pts);
662 end_ebml_master(pb, mkv->cluster);
664 if (mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)) < 0)
667 mkv->cluster_pos = url_ftell(pb);
668 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
669 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
670 mkv->cluster_pts = pkt->pts;
671 av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
674 if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
675 mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
677 offset_t blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP);
678 mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
679 put_ebml_uint(pb, MATROSKA_ID_DURATION, pkt->duration);
680 end_ebml_master(pb, blockgroup);
683 if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
684 if (mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos) < 0)
688 mkv->duration = pkt->pts + pkt->duration;
692 static int mkv_write_trailer(AVFormatContext *s)
694 MatroskaMuxContext *mkv = s->priv_data;
695 ByteIOContext *pb = &s->pb;
696 offset_t currentpos, second_seekhead, cuespos;
698 end_ebml_master(pb, mkv->cluster);
700 cuespos = mkv_write_cues(pb, mkv->cues);
701 second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
703 mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
704 mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
705 mkv_write_seekhead(pb, mkv->main_seekhead);
707 // update the duration
708 av_log(s, AV_LOG_DEBUG, "end duration = %llu\n", mkv->duration);
709 currentpos = url_ftell(pb);
710 url_fseek(pb, mkv->duration_offset, SEEK_SET);
711 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
713 // write the md5sum of some frames as the segment UID
714 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
715 uint8_t segment_uid[16];
716 av_md5_final(mkv->md5_ctx, segment_uid);
717 url_fseek(pb, mkv->segment_uid, SEEK_SET);
718 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
720 url_fseek(pb, currentpos, SEEK_SET);
722 end_ebml_master(pb, mkv->segment);
723 av_free(mkv->md5_ctx);
727 AVOutputFormat matroska_muxer = {
729 "Matroska File Format",
732 sizeof(MatroskaMuxContext),
738 .codec_tag = (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
741 AVOutputFormat matroska_audio_muxer = {
743 "Matroska File Format",
746 sizeof(MatroskaMuxContext),
752 .codec_tag = (const AVCodecTag*[]){codec_wav_tags, 0},