3 * Copyright (c) 2007 David Conrad
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "avlanguage.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/intfloat.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/lfg.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/random_seed.h"
40 #include "libavutil/samplefmt.h"
42 #include "libavcodec/xiph.h"
43 #include "libavcodec/mpeg4audio.h"
45 typedef struct ebml_master {
46 int64_t pos; ///< absolute offset in the file where the master's elements start
47 int sizebytes; ///< how many bytes were reserved for the size
50 typedef struct mkv_seekhead_entry {
51 unsigned int elementid;
55 typedef struct mkv_seekhead {
57 int64_t segment_offset; ///< the file offset to the beginning of the segment
58 int reserved_size; ///< -1 if appending to file
60 mkv_seekhead_entry *entries;
67 int64_t cluster_pos; ///< file offset of the cluster containing the block
71 int64_t segment_offset;
72 mkv_cuepoint *entries;
80 #define MODE_MATROSKAv2 0x01
81 #define MODE_WEBM 0x02
83 typedef struct MatroskaMuxContext {
88 int64_t segment_offset;
90 int64_t cluster_pos; ///< file offset of the current cluster
92 int64_t duration_offset;
94 mkv_seekhead *main_seekhead;
98 AVPacket cur_audio_pkt;
100 int have_attachments;
102 int reserve_cues_space;
103 int cluster_size_limit;
105 int64_t cluster_time_limit;
107 } MatroskaMuxContext;
110 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
111 * offset, 4 bytes for target EBML ID */
112 #define MAX_SEEKENTRY_SIZE 21
114 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
116 #define MAX_CUETRACKPOS_SIZE 22
118 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
119 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
122 static int ebml_id_size(unsigned int id)
124 return (av_log2(id+1)-1)/7+1;
127 static void put_ebml_id(AVIOContext *pb, unsigned int id)
129 int i = ebml_id_size(id);
131 avio_w8(pb, id >> (i*8));
135 * Write an EBML size meaning "unknown size".
137 * @param bytes The number of bytes the size should occupy (maximum: 8).
139 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
142 avio_w8(pb, 0x1ff >> bytes);
148 * Calculate how many bytes are needed to represent a given number in EBML.
150 static int ebml_num_size(uint64_t num)
153 while ((num+1) >> bytes*7) bytes++;
158 * Write a number in EBML variable length format.
160 * @param bytes The number of bytes that need to be used to write the number.
161 * If zero, any number of bytes can be used.
163 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
165 int i, needed_bytes = ebml_num_size(num);
167 // sizes larger than this are currently undefined in EBML
168 assert(num < (1ULL<<56)-1);
171 // don't care how many bytes are used, so use the min
172 bytes = needed_bytes;
173 // the bytes needed to write the given size would exceed the bytes
174 // that we need to use, so write unknown size. This shouldn't happen.
175 assert(bytes >= needed_bytes);
177 num |= 1ULL << bytes*7;
178 for (i = bytes - 1; i >= 0; i--)
179 avio_w8(pb, num >> i*8);
182 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
186 while (tmp>>=8) bytes++;
188 put_ebml_id(pb, elementid);
189 put_ebml_num(pb, bytes, 0);
190 for (i = bytes - 1; i >= 0; i--)
191 avio_w8(pb, val >> i*8);
194 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
196 put_ebml_id(pb, elementid);
197 put_ebml_num(pb, 8, 0);
198 avio_wb64(pb, av_double2int(val));
201 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
202 const void *buf, int size)
204 put_ebml_id(pb, elementid);
205 put_ebml_num(pb, size, 0);
206 avio_write(pb, buf, size);
209 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
211 put_ebml_binary(pb, elementid, str, strlen(str));
215 * Write a void element of a given size. Useful for reserving space in
216 * the file to be written to later.
218 * @param size The number of bytes to reserve, which must be at least 2.
220 static void put_ebml_void(AVIOContext *pb, uint64_t size)
222 int64_t currentpos = avio_tell(pb);
226 put_ebml_id(pb, EBML_ID_VOID);
227 // we need to subtract the length needed to store the size from the
228 // size we need to reserve so 2 cases, we use 8 bytes to store the
229 // size if possible, 1 byte otherwise
231 put_ebml_num(pb, size-1, 0);
233 put_ebml_num(pb, size-9, 8);
234 while(avio_tell(pb) < currentpos + size)
238 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
240 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
241 put_ebml_id(pb, elementid);
242 put_ebml_size_unknown(pb, bytes);
243 return (ebml_master){ avio_tell(pb), bytes };
246 static void end_ebml_master(AVIOContext *pb, ebml_master master)
248 int64_t pos = avio_tell(pb);
250 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
252 put_ebml_num(pb, pos - master.pos, master.sizebytes);
253 avio_seek(pb, pos, SEEK_SET);
256 static void put_xiph_size(AVIOContext *pb, int size)
259 for (i = 0; i < size / 255; i++)
261 avio_w8(pb, size % 255);
265 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
266 * elements. If a maximum number of elements is specified, enough space
267 * will be reserved at the current file location to write a seek head of
270 * @param segment_offset The absolute offset to the position in the file
271 * where the segment begins.
272 * @param numelements The maximum number of elements that will be indexed
273 * by this seek head, 0 if unlimited.
275 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
277 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
278 if (new_seekhead == NULL)
281 new_seekhead->segment_offset = segment_offset;
283 if (numelements > 0) {
284 new_seekhead->filepos = avio_tell(pb);
285 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
286 // and size, and 3 bytes to guarantee that an EBML void element
287 // will fit afterwards
288 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
289 new_seekhead->max_entries = numelements;
290 put_ebml_void(pb, new_seekhead->reserved_size);
295 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
299 // don't store more elements than we reserved space for
300 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
303 if ((err = av_reallocp_array(&seekhead->entries, seekhead->num_entries + 1,
304 sizeof(*seekhead->entries))) < 0) {
305 seekhead->num_entries = 0;
309 seekhead->entries[seekhead->num_entries].elementid = elementid;
310 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
316 * Write the seek head to the file and free it. If a maximum number of
317 * elements was specified to mkv_start_seekhead(), the seek head will
318 * be written at the location reserved for it. Otherwise, it is written
319 * at the current location in the file.
321 * @return The file offset where the seekhead was written,
322 * -1 if an error occurred.
324 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
326 ebml_master metaseek, seekentry;
330 currentpos = avio_tell(pb);
332 if (seekhead->reserved_size > 0) {
333 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
339 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
340 for (i = 0; i < seekhead->num_entries; i++) {
341 mkv_seekhead_entry *entry = &seekhead->entries[i];
343 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
345 put_ebml_id(pb, MATROSKA_ID_SEEKID);
346 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
347 put_ebml_id(pb, entry->elementid);
349 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
350 end_ebml_master(pb, seekentry);
352 end_ebml_master(pb, metaseek);
354 if (seekhead->reserved_size > 0) {
355 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
356 put_ebml_void(pb, remaining);
357 avio_seek(pb, currentpos, SEEK_SET);
359 currentpos = seekhead->filepos;
362 av_free(seekhead->entries);
368 static mkv_cues * mkv_start_cues(int64_t segment_offset)
370 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
374 cues->segment_offset = segment_offset;
378 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
385 if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
386 sizeof(*cues->entries))) < 0) {
387 cues->num_entries = 0;
391 cues->entries[cues->num_entries].pts = ts;
392 cues->entries[cues->num_entries].tracknum = stream + 1;
393 cues->entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
398 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
400 ebml_master cues_element;
404 currentpos = avio_tell(pb);
405 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
407 for (i = 0; i < cues->num_entries; i++) {
408 ebml_master cuepoint, track_positions;
409 mkv_cuepoint *entry = &cues->entries[i];
410 uint64_t pts = entry->pts;
412 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
413 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
415 // put all the entries from different tracks that have the exact same
416 // timestamp into the same CuePoint
417 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
418 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
419 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
420 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
421 end_ebml_master(pb, track_positions);
424 end_ebml_master(pb, cuepoint);
426 end_ebml_master(pb, cues_element);
431 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
433 uint8_t *header_start[3];
435 int first_header_size;
438 if (codec->codec_id == AV_CODEC_ID_VORBIS)
439 first_header_size = 30;
441 first_header_size = 42;
443 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
444 first_header_size, header_start, header_len) < 0) {
445 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
449 avio_w8(pb, 2); // number packets - 1
450 for (j = 0; j < 2; j++) {
451 put_xiph_size(pb, header_len[j]);
453 for (j = 0; j < 3; j++)
454 avio_write(pb, header_start[j], header_len[j]);
459 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
461 if (codec->extradata && codec->extradata_size == 2)
462 avio_write(pb, codec->extradata, 2);
464 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
468 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
470 MPEG4AudioConfig mp4ac;
472 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
473 codec->extradata_size * 8, 1) < 0) {
474 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
478 *sample_rate = mp4ac.sample_rate;
479 *output_sample_rate = mp4ac.ext_sample_rate;
482 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
486 int ret, codecpriv_size;
488 ret = avio_open_dyn_buf(&dyn_cp);
493 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
494 ret = put_xiph_codecpriv(s, dyn_cp, codec);
495 else if (codec->codec_id == AV_CODEC_ID_FLAC)
496 ret = ff_flac_write_header(dyn_cp, codec, 1);
497 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
498 ret = put_wv_codecpriv(dyn_cp, codec);
499 else if (codec->codec_id == AV_CODEC_ID_H264)
500 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
501 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
502 if (codec->extradata_size < 36) {
503 av_log(s, AV_LOG_ERROR,
504 "Invalid extradata found, ALAC expects a 36-byte "
506 ret = AVERROR_INVALIDDATA;
508 avio_write(dyn_cp, codec->extradata + 12,
509 codec->extradata_size - 12);
511 else if (codec->extradata_size)
512 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
513 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
515 if (!codec->codec_tag)
516 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
517 if (codec->extradata_size)
518 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
520 if (!codec->codec_tag)
521 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
522 if (!codec->codec_tag) {
523 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
527 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
530 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
532 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
534 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
537 if (!codec->codec_tag)
538 codec->codec_tag = tag;
540 ff_put_wav_header(dyn_cp, codec);
543 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
545 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
550 static int mkv_write_tracks(AVFormatContext *s)
552 MatroskaMuxContext *mkv = s->priv_data;
553 AVIOContext *pb = s->pb;
557 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
558 if (ret < 0) return ret;
560 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
561 for (i = 0; i < s->nb_streams; i++) {
562 AVStream *st = s->streams[i];
563 AVCodecContext *codec = st->codec;
564 ebml_master subinfo, track;
567 int bit_depth = av_get_bits_per_sample(codec->codec_id);
568 int sample_rate = codec->sample_rate;
569 int output_sample_rate = 0;
570 AVDictionaryEntry *tag;
572 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
573 mkv->have_attachments = 1;
578 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
580 if (codec->codec_id == AV_CODEC_ID_AAC)
581 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
583 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
584 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
585 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
586 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
588 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
589 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
590 tag = av_dict_get(st->metadata, "language", NULL, 0);
591 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
593 // The default value for TRACKFLAGDEFAULT is 1, so add element
594 // if we need to clear it.
595 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
596 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
598 // look for a codec ID string specific to mkv to use,
599 // if none are found, use AVI codes
600 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
601 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
602 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
608 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
609 codec->codec_id == AV_CODEC_ID_VORBIS)) {
610 av_log(s, AV_LOG_ERROR,
611 "Only VP8 video and Vorbis audio are supported for WebM.\n");
612 return AVERROR(EINVAL);
615 switch (codec->codec_type) {
616 case AVMEDIA_TYPE_VIDEO:
617 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
618 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
621 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
622 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
623 || codec->codec_id == AV_CODEC_ID_SVQ1
624 || codec->codec_id == AV_CODEC_ID_SVQ3
625 || codec->codec_id == AV_CODEC_ID_CINEPAK))
629 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
630 else if (!native_id) {
631 // if there is no mkv-specific codec ID, use VFW mode
632 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
633 mkv->tracks[i].write_dts = 1;
636 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
637 // XXX: interlace flag?
638 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
639 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
640 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
641 uint8_t stereo_fmt = atoi(tag->value);
646 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM
647 || stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
650 case MODE_MATROSKAv2:
651 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
657 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
659 if (st->sample_aspect_ratio.num) {
660 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
661 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
662 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
663 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
665 end_ebml_master(pb, subinfo);
668 case AVMEDIA_TYPE_AUDIO:
669 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
672 // no mkv-specific ID, use ACM mode
673 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
675 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
676 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
677 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
678 if (output_sample_rate)
679 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
681 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
682 end_ebml_master(pb, subinfo);
685 case AVMEDIA_TYPE_SUBTITLE:
686 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
688 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
689 return AVERROR(ENOSYS);
693 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
696 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
697 if (ret < 0) return ret;
699 end_ebml_master(pb, track);
701 // ms precision is the de-facto standard timescale for mkv files
702 avpriv_set_pts_info(st, 64, 1, 1000);
704 end_ebml_master(pb, tracks);
708 static int mkv_write_chapters(AVFormatContext *s)
710 MatroskaMuxContext *mkv = s->priv_data;
711 AVIOContext *pb = s->pb;
712 ebml_master chapters, editionentry;
713 AVRational scale = {1, 1E9};
716 if (!s->nb_chapters || mkv->wrote_chapters)
719 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
720 if (ret < 0) return ret;
722 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
723 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
724 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
725 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
726 for (i = 0; i < s->nb_chapters; i++) {
727 ebml_master chapteratom, chapterdisplay;
728 AVChapter *c = s->chapters[i];
729 AVDictionaryEntry *t = NULL;
731 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
732 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
733 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
734 av_rescale_q(c->start, c->time_base, scale));
735 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
736 av_rescale_q(c->end, c->time_base, scale));
737 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
738 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
739 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
740 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
741 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
742 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
743 end_ebml_master(pb, chapterdisplay);
745 end_ebml_master(pb, chapteratom);
747 end_ebml_master(pb, editionentry);
748 end_ebml_master(pb, chapters);
750 mkv->wrote_chapters = 1;
754 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
756 uint8_t *key = av_strdup(t->key);
758 const uint8_t *lang = NULL;
761 if ((p = strrchr(p, '-')) &&
762 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
769 else if (*p >= 'a' && *p <= 'z')
774 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
775 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
777 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
778 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
779 end_ebml_master(pb, tag);
784 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
785 unsigned int uid, ebml_master *tags)
787 MatroskaMuxContext *mkv = s->priv_data;
788 ebml_master tag, targets;
789 AVDictionaryEntry *t = NULL;
793 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
794 if (ret < 0) return ret;
796 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
799 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
800 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
802 put_ebml_uint(s->pb, elementid, uid);
803 end_ebml_master(s->pb, targets);
805 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
806 if (av_strcasecmp(t->key, "title"))
807 mkv_write_simpletag(s->pb, t);
809 end_ebml_master(s->pb, tag);
813 static int mkv_write_tags(AVFormatContext *s)
815 ebml_master tags = {0};
818 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
820 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
821 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
822 if (ret < 0) return ret;
825 for (i = 0; i < s->nb_streams; i++) {
826 AVStream *st = s->streams[i];
828 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
831 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
832 if (ret < 0) return ret;
835 for (i = 0; i < s->nb_chapters; i++) {
836 AVChapter *ch = s->chapters[i];
838 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
841 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
842 if (ret < 0) return ret;
846 end_ebml_master(s->pb, tags);
850 static int mkv_write_attachments(AVFormatContext *s)
852 MatroskaMuxContext *mkv = s->priv_data;
853 AVIOContext *pb = s->pb;
854 ebml_master attachments;
858 if (!mkv->have_attachments)
861 av_lfg_init(&c, av_get_random_seed());
863 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
864 if (ret < 0) return ret;
866 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
868 for (i = 0; i < s->nb_streams; i++) {
869 AVStream *st = s->streams[i];
870 ebml_master attached_file;
871 AVDictionaryEntry *t;
872 const char *mimetype = NULL;
874 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
877 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
879 if (t = av_dict_get(st->metadata, "title", NULL, 0))
880 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
881 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
882 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
883 return AVERROR(EINVAL);
885 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
886 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
888 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
890 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
891 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
892 mimetype = ff_mkv_mime_tags[i].str;
897 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
898 "it cannot be deduced from the codec id.\n", i);
899 return AVERROR(EINVAL);
902 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
903 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
904 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
905 end_ebml_master(pb, attached_file);
907 end_ebml_master(pb, attachments);
912 static int mkv_write_header(AVFormatContext *s)
914 MatroskaMuxContext *mkv = s->priv_data;
915 AVIOContext *pb = s->pb;
916 ebml_master ebml_header, segment_info;
917 AVDictionaryEntry *tag;
920 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
921 else mkv->mode = MODE_MATROSKAv2;
923 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
925 return AVERROR(ENOMEM);
927 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
928 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
929 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
930 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
931 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
932 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
933 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
934 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
935 end_ebml_master(pb, ebml_header);
937 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
938 mkv->segment_offset = avio_tell(pb);
940 // we write 2 seek heads - one at the end of the file to point to each
941 // cluster, and one at the beginning to point to all other level one
942 // elements (including the seek head at the end of the file), which
943 // isn't more than 10 elements if we only write one of each other
944 // currently defined level 1 element
945 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
946 if (!mkv->main_seekhead)
947 return AVERROR(ENOMEM);
949 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
950 if (ret < 0) return ret;
952 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
953 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
954 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
955 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
956 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
957 uint32_t segment_uid[4];
960 av_lfg_init(&lfg, av_get_random_seed());
962 for (i = 0; i < 4; i++)
963 segment_uid[i] = av_lfg_get(&lfg);
965 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
966 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
967 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
970 // reserve space for the duration
972 mkv->duration_offset = avio_tell(pb);
973 put_ebml_void(pb, 11); // assumes double-precision float to be written
974 end_ebml_master(pb, segment_info);
976 ret = mkv_write_tracks(s);
977 if (ret < 0) return ret;
979 if (mkv->mode != MODE_WEBM) {
980 ret = mkv_write_chapters(s);
981 if (ret < 0) return ret;
983 ret = mkv_write_tags(s);
984 if (ret < 0) return ret;
986 ret = mkv_write_attachments(s);
987 if (ret < 0) return ret;
990 if (!s->pb->seekable)
991 mkv_write_seekhead(pb, mkv->main_seekhead);
993 mkv->cues = mkv_start_cues(mkv->segment_offset);
994 if (mkv->cues == NULL)
995 return AVERROR(ENOMEM);
997 if (pb->seekable && mkv->reserve_cues_space) {
998 mkv->cues_pos = avio_tell(pb);
999 put_ebml_void(pb, mkv->reserve_cues_space);
1002 av_init_packet(&mkv->cur_audio_pkt);
1003 mkv->cur_audio_pkt.size = 0;
1007 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1008 // after 4k and on a keyframe
1010 if (mkv->cluster_time_limit < 0)
1011 mkv->cluster_time_limit = 5000;
1012 if (mkv->cluster_size_limit < 0)
1013 mkv->cluster_size_limit = 5 * 1024 * 1024;
1015 if (mkv->cluster_time_limit < 0)
1016 mkv->cluster_time_limit = 1000;
1017 if (mkv->cluster_size_limit < 0)
1018 mkv->cluster_size_limit = 32 * 1024;
1024 static int mkv_blockgroup_size(int pkt_size)
1026 int size = pkt_size + 4;
1027 size += ebml_num_size(size);
1028 size += 2; // EBML ID for block and block duration
1029 size += 8; // max size of block duration
1030 size += ebml_num_size(size);
1031 size += 1; // blockgroup EBML ID
1035 static int ass_get_duration(const uint8_t *p)
1037 int sh, sm, ss, sc, eh, em, es, ec;
1038 uint64_t start, end;
1040 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1041 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1043 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1044 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1048 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1050 MatroskaMuxContext *mkv = s->priv_data;
1051 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1052 uint8_t *start, *end, *data = pkt->data;
1053 ebml_master blockgroup;
1057 int duration = ass_get_duration(data);
1058 max_duration = FFMAX(duration, max_duration);
1059 end = memchr(data, '\n', data_size);
1060 size = line_size = end ? end-data+1 : data_size;
1061 size -= end ? (end[-1]=='\r')+1 : 0;
1063 for (i=0; i<3; i++, start++)
1064 if (!(start = memchr(start, ',', size-(start-data))))
1065 return max_duration;
1066 size -= start - data;
1067 sscanf(data, "Dialogue: %d,", &layer);
1068 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1069 s->streams[pkt->stream_index]->nb_frames, layer);
1070 size = FFMIN(i+size, sizeof(buffer));
1071 memcpy(buffer+i, start, size-i);
1073 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1074 "pts %" PRId64 ", duration %d\n",
1075 avio_tell(pb), size, pkt->pts, duration);
1076 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1077 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1078 put_ebml_num(pb, size+4, 0);
1079 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1080 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1082 avio_write(pb, buffer, size);
1083 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1084 end_ebml_master(pb, blockgroup);
1087 data_size -= line_size;
1090 return max_duration;
1093 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1100 dst = av_malloc(srclen);
1102 return AVERROR(ENOMEM);
1104 while (srclen >= WV_HEADER_SIZE) {
1107 ret = ff_wv_parse_header(&header, src);
1110 src += WV_HEADER_SIZE;
1111 srclen -= WV_HEADER_SIZE;
1113 if (srclen < header.blocksize) {
1114 ret = AVERROR_INVALIDDATA;
1118 if (header.initial) {
1119 AV_WL32(dst + offset, header.samples);
1122 AV_WL32(dst + offset, header.flags);
1123 AV_WL32(dst + offset + 4, header.crc);
1126 if (!(header.initial && header.final)) {
1127 AV_WL32(dst + offset, header.blocksize);
1131 memcpy(dst + offset, src, header.blocksize);
1132 src += header.blocksize;
1133 srclen -= header.blocksize;
1134 offset += header.blocksize;
1146 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1147 unsigned int blockid, AVPacket *pkt, int flags)
1149 MatroskaMuxContext *mkv = s->priv_data;
1150 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1151 uint8_t *data = NULL;
1152 int offset = 0, size = pkt->size;
1153 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1155 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1156 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1157 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1158 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1159 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1160 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1161 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1162 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1164 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1170 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1171 /* Matroska specification requires to remove the first QuickTime atom
1177 put_ebml_id(pb, blockid);
1178 put_ebml_num(pb, size+4, 0);
1179 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1180 avio_wb16(pb, ts - mkv->cluster_pts);
1182 avio_write(pb, data + offset, size);
1183 if (data != pkt->data)
1187 static int srt_get_duration(uint8_t **buf)
1189 int i, duration = 0;
1191 for (i=0; i<2 && !duration; i++) {
1192 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1193 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1194 &s_hour, &s_min, &s_sec, &s_hsec,
1195 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1196 s_min += 60*s_hour; e_min += 60*e_hour;
1197 s_sec += 60*s_min; e_sec += 60*e_min;
1198 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1199 duration = e_hsec - s_hsec;
1201 *buf += strcspn(*buf, "\n") + 1;
1206 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1208 ebml_master blockgroup;
1209 AVPacket pkt2 = *pkt;
1210 int64_t duration = srt_get_duration(&pkt2.data);
1211 pkt2.size -= pkt2.data - pkt->data;
1213 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1214 mkv_blockgroup_size(pkt2.size));
1215 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1216 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1217 end_ebml_master(pb, blockgroup);
1222 static void mkv_flush_dynbuf(AVFormatContext *s)
1224 MatroskaMuxContext *mkv = s->priv_data;
1231 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1232 avio_write(s->pb, dyn_buf, bufsize);
1237 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1239 MatroskaMuxContext *mkv = s->priv_data;
1240 AVIOContext *pb = s->pb;
1241 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1242 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1243 int duration = pkt->duration;
1245 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1247 if (ts == AV_NOPTS_VALUE) {
1248 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1249 return AVERROR(EINVAL);
1252 if (!s->pb->seekable) {
1254 avio_open_dyn_buf(&mkv->dyn_bc);
1258 if (!mkv->cluster_pos) {
1259 mkv->cluster_pos = avio_tell(s->pb);
1260 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1261 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1262 mkv->cluster_pts = FFMAX(0, ts);
1265 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1266 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1267 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1268 duration = mkv_write_ass_blocks(s, pb, pkt);
1269 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1270 duration = mkv_write_srt_blocks(s, pb, pkt);
1272 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1273 duration = pkt->convergence_duration;
1274 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1275 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1276 end_ebml_master(pb, blockgroup);
1279 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1280 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1281 if (ret < 0) return ret;
1284 mkv->duration = FFMAX(mkv->duration, ts + duration);
1288 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1290 MatroskaMuxContext *mkv = s->priv_data;
1291 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1292 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1294 int64_t cluster_time;
1298 if (mkv->tracks[pkt->stream_index].write_dts)
1299 cluster_time = pkt->dts - mkv->cluster_pts;
1301 cluster_time = pkt->pts - mkv->cluster_pts;
1303 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1304 // after 4k and on a keyframe
1305 if (s->pb->seekable) {
1307 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1310 cluster_size = avio_tell(pb);
1313 if (mkv->cluster_pos &&
1314 (cluster_size > mkv->cluster_size_limit ||
1315 cluster_time > mkv->cluster_time_limit ||
1316 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1317 cluster_size > 4 * 1024))) {
1318 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1319 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1320 avio_tell(pb), pkt->pts, pkt->dts);
1321 end_ebml_master(pb, mkv->cluster);
1322 mkv->cluster_pos = 0;
1324 mkv_flush_dynbuf(s);
1328 // check if we have an audio packet cached
1329 if (mkv->cur_audio_pkt.size > 0) {
1330 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1331 av_free_packet(&mkv->cur_audio_pkt);
1333 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1338 // buffer an audio packet to ensure the packet containing the video
1339 // keyframe's timecode is contained in the same cluster for WebM
1340 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1341 mkv->cur_audio_pkt = *pkt;
1343 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1344 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1346 ret = av_dup_packet(&mkv->cur_audio_pkt);
1348 ret = mkv_write_packet_internal(s, pkt);
1352 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1354 MatroskaMuxContext *mkv = s->priv_data;
1356 if (s->pb->seekable)
1361 if (mkv->cluster_pos) {
1362 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1363 " bytes\n", avio_tell(pb));
1364 end_ebml_master(pb, mkv->cluster);
1365 mkv->cluster_pos = 0;
1367 mkv_flush_dynbuf(s);
1372 return mkv_write_packet(s, pkt);
1375 static int mkv_write_trailer(AVFormatContext *s)
1377 MatroskaMuxContext *mkv = s->priv_data;
1378 AVIOContext *pb = s->pb;
1379 int64_t currentpos, cuespos;
1382 // check if we have an audio packet cached
1383 if (mkv->cur_audio_pkt.size > 0) {
1384 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1385 av_free_packet(&mkv->cur_audio_pkt);
1387 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1393 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1394 mkv_flush_dynbuf(s);
1395 } else if (mkv->cluster_pos) {
1396 end_ebml_master(pb, mkv->cluster);
1399 if (mkv->mode != MODE_WEBM) {
1400 ret = mkv_write_chapters(s);
1401 if (ret < 0) return ret;
1405 if (mkv->cues->num_entries) {
1406 if (mkv->reserve_cues_space) {
1409 currentpos = avio_tell(pb);
1410 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1412 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1413 cues_end = avio_tell(pb);
1414 if (cues_end > cuespos + mkv->reserve_cues_space) {
1415 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1416 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1417 cues_end - cuespos);
1418 return AVERROR(EINVAL);
1421 if (cues_end < cuespos + mkv->reserve_cues_space)
1422 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1424 avio_seek(pb, currentpos, SEEK_SET);
1426 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1429 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1430 if (ret < 0) return ret;
1433 mkv_write_seekhead(pb, mkv->main_seekhead);
1435 // update the duration
1436 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1437 currentpos = avio_tell(pb);
1438 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1439 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1441 avio_seek(pb, currentpos, SEEK_SET);
1444 end_ebml_master(pb, mkv->segment);
1445 av_free(mkv->tracks);
1446 av_freep(&mkv->cues->entries);
1447 av_freep(&mkv->cues);
1452 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1455 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1456 if (ff_mkv_codec_tags[i].id == codec_id)
1459 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1460 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1461 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1468 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1469 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1470 static const AVOption options[] = {
1471 { "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 },
1472 { "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 },
1473 { "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 },
1477 #if CONFIG_MATROSKA_MUXER
1478 static const AVClass matroska_class = {
1479 .class_name = "matroska muxer",
1480 .item_name = av_default_item_name,
1482 .version = LIBAVUTIL_VERSION_INT,
1485 AVOutputFormat ff_matroska_muxer = {
1487 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1488 .mime_type = "video/x-matroska",
1489 .extensions = "mkv",
1490 .priv_data_size = sizeof(MatroskaMuxContext),
1491 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1492 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1493 .video_codec = CONFIG_LIBX264_ENCODER ?
1494 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1495 .write_header = mkv_write_header,
1496 .write_packet = mkv_write_flush_packet,
1497 .write_trailer = mkv_write_trailer,
1498 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1499 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1500 .codec_tag = (const AVCodecTag* const []){
1501 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1503 .subtitle_codec = AV_CODEC_ID_SSA,
1504 .query_codec = mkv_query_codec,
1505 .priv_class = &matroska_class,
1509 #if CONFIG_WEBM_MUXER
1510 static const AVClass webm_class = {
1511 .class_name = "webm muxer",
1512 .item_name = av_default_item_name,
1514 .version = LIBAVUTIL_VERSION_INT,
1517 AVOutputFormat ff_webm_muxer = {
1519 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1520 .mime_type = "video/webm",
1521 .extensions = "webm",
1522 .priv_data_size = sizeof(MatroskaMuxContext),
1523 .audio_codec = AV_CODEC_ID_VORBIS,
1524 .video_codec = AV_CODEC_ID_VP8,
1525 .write_header = mkv_write_header,
1526 .write_packet = mkv_write_flush_packet,
1527 .write_trailer = mkv_write_trailer,
1528 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1529 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1530 .priv_class = &webm_class,
1534 #if CONFIG_MATROSKA_AUDIO_MUXER
1535 static const AVClass mka_class = {
1536 .class_name = "matroska audio muxer",
1537 .item_name = av_default_item_name,
1539 .version = LIBAVUTIL_VERSION_INT,
1541 AVOutputFormat ff_matroska_audio_muxer = {
1543 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1544 .mime_type = "audio/x-matroska",
1545 .extensions = "mka",
1546 .priv_data_size = sizeof(MatroskaMuxContext),
1547 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1548 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1549 .video_codec = AV_CODEC_ID_NONE,
1550 .write_header = mkv_write_header,
1551 .write_packet = mkv_write_flush_packet,
1552 .write_trailer = mkv_write_trailer,
1553 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1555 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1556 .priv_class = &mka_class,