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)
297 mkv_seekhead_entry *entries = seekhead->entries;
300 // don't store more elements than we reserved space for
301 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
304 if ((err = av_reallocp_array(&entries, seekhead->num_entries + 1,
305 sizeof(*entries))) < 0) {
306 seekhead->num_entries = 0;
310 entries[seekhead->num_entries ].elementid = elementid;
311 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
313 seekhead->entries = entries;
318 * Write the seek head to the file and free it. If a maximum number of
319 * elements was specified to mkv_start_seekhead(), the seek head will
320 * be written at the location reserved for it. Otherwise, it is written
321 * at the current location in the file.
323 * @return The file offset where the seekhead was written,
324 * -1 if an error occurred.
326 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
328 ebml_master metaseek, seekentry;
332 currentpos = avio_tell(pb);
334 if (seekhead->reserved_size > 0) {
335 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
341 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
342 for (i = 0; i < seekhead->num_entries; i++) {
343 mkv_seekhead_entry *entry = &seekhead->entries[i];
345 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
347 put_ebml_id(pb, MATROSKA_ID_SEEKID);
348 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
349 put_ebml_id(pb, entry->elementid);
351 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
352 end_ebml_master(pb, seekentry);
354 end_ebml_master(pb, metaseek);
356 if (seekhead->reserved_size > 0) {
357 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
358 put_ebml_void(pb, remaining);
359 avio_seek(pb, currentpos, SEEK_SET);
361 currentpos = seekhead->filepos;
364 av_free(seekhead->entries);
370 static mkv_cues * mkv_start_cues(int64_t segment_offset)
372 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
376 cues->segment_offset = segment_offset;
380 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
382 mkv_cuepoint *entries = cues->entries;
388 if ((err = av_reallocp_array(&entries, cues->num_entries + 1,
389 sizeof(*entries))) < 0) {
390 cues->num_entries = 0;
394 entries[cues->num_entries ].pts = ts;
395 entries[cues->num_entries ].tracknum = stream + 1;
396 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
398 cues->entries = entries;
402 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
404 ebml_master cues_element;
408 currentpos = avio_tell(pb);
409 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
411 for (i = 0; i < cues->num_entries; i++) {
412 ebml_master cuepoint, track_positions;
413 mkv_cuepoint *entry = &cues->entries[i];
414 uint64_t pts = entry->pts;
416 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
417 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
419 // put all the entries from different tracks that have the exact same
420 // timestamp into the same CuePoint
421 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
422 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
423 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
424 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
425 end_ebml_master(pb, track_positions);
428 end_ebml_master(pb, cuepoint);
430 end_ebml_master(pb, cues_element);
435 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
437 uint8_t *header_start[3];
439 int first_header_size;
442 if (codec->codec_id == AV_CODEC_ID_VORBIS)
443 first_header_size = 30;
445 first_header_size = 42;
447 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
448 first_header_size, header_start, header_len) < 0) {
449 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
453 avio_w8(pb, 2); // number packets - 1
454 for (j = 0; j < 2; j++) {
455 put_xiph_size(pb, header_len[j]);
457 for (j = 0; j < 3; j++)
458 avio_write(pb, header_start[j], header_len[j]);
463 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
465 if (codec->extradata && codec->extradata_size == 2)
466 avio_write(pb, codec->extradata, 2);
468 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
472 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
474 MPEG4AudioConfig mp4ac;
476 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
477 codec->extradata_size * 8, 1) < 0) {
478 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
482 *sample_rate = mp4ac.sample_rate;
483 *output_sample_rate = mp4ac.ext_sample_rate;
486 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
490 int ret, codecpriv_size;
492 ret = avio_open_dyn_buf(&dyn_cp);
497 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
498 ret = put_xiph_codecpriv(s, dyn_cp, codec);
499 else if (codec->codec_id == AV_CODEC_ID_FLAC)
500 ret = ff_flac_write_header(dyn_cp, codec, 1);
501 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
502 ret = put_wv_codecpriv(dyn_cp, codec);
503 else if (codec->codec_id == AV_CODEC_ID_H264)
504 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
505 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
506 if (codec->extradata_size < 36) {
507 av_log(s, AV_LOG_ERROR,
508 "Invalid extradata found, ALAC expects a 36-byte "
510 ret = AVERROR_INVALIDDATA;
512 avio_write(dyn_cp, codec->extradata + 12,
513 codec->extradata_size - 12);
515 else if (codec->extradata_size)
516 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
517 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
519 if (!codec->codec_tag)
520 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
521 if (codec->extradata_size)
522 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
524 if (!codec->codec_tag)
525 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
526 if (!codec->codec_tag) {
527 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
531 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
534 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
536 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
538 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
541 if (!codec->codec_tag)
542 codec->codec_tag = tag;
544 ff_put_wav_header(dyn_cp, codec);
547 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
549 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
554 static int mkv_write_tracks(AVFormatContext *s)
556 MatroskaMuxContext *mkv = s->priv_data;
557 AVIOContext *pb = s->pb;
561 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
562 if (ret < 0) return ret;
564 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
565 for (i = 0; i < s->nb_streams; i++) {
566 AVStream *st = s->streams[i];
567 AVCodecContext *codec = st->codec;
568 ebml_master subinfo, track;
571 int bit_depth = av_get_bits_per_sample(codec->codec_id);
572 int sample_rate = codec->sample_rate;
573 int output_sample_rate = 0;
574 AVDictionaryEntry *tag;
576 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
577 mkv->have_attachments = 1;
582 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
584 if (codec->codec_id == AV_CODEC_ID_AAC)
585 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
587 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
588 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
589 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
590 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
592 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
593 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
594 tag = av_dict_get(st->metadata, "language", NULL, 0);
595 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
597 // The default value for TRACKFLAGDEFAULT is 1, so add element
598 // if we need to clear it.
599 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
600 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
602 // look for a codec ID string specific to mkv to use,
603 // if none are found, use AVI codes
604 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
605 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
606 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
612 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
613 codec->codec_id == AV_CODEC_ID_VORBIS)) {
614 av_log(s, AV_LOG_ERROR,
615 "Only VP8 video and Vorbis audio are supported for WebM.\n");
616 return AVERROR(EINVAL);
619 switch (codec->codec_type) {
620 case AVMEDIA_TYPE_VIDEO:
621 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
622 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
625 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
626 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
627 || codec->codec_id == AV_CODEC_ID_SVQ1
628 || codec->codec_id == AV_CODEC_ID_SVQ3
629 || codec->codec_id == AV_CODEC_ID_CINEPAK))
633 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
634 else if (!native_id) {
635 // if there is no mkv-specific codec ID, use VFW mode
636 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
637 mkv->tracks[i].write_dts = 1;
640 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
641 // XXX: interlace flag?
642 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
643 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
644 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
645 uint8_t stereo_fmt = atoi(tag->value);
650 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM
651 || stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
654 case MODE_MATROSKAv2:
655 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
661 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
663 if (st->sample_aspect_ratio.num) {
664 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
665 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
666 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
667 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
669 end_ebml_master(pb, subinfo);
672 case AVMEDIA_TYPE_AUDIO:
673 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
676 // no mkv-specific ID, use ACM mode
677 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
679 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
680 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
681 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
682 if (output_sample_rate)
683 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
685 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
686 end_ebml_master(pb, subinfo);
689 case AVMEDIA_TYPE_SUBTITLE:
690 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
692 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
693 return AVERROR(ENOSYS);
697 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
700 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
701 if (ret < 0) return ret;
703 end_ebml_master(pb, track);
705 // ms precision is the de-facto standard timescale for mkv files
706 avpriv_set_pts_info(st, 64, 1, 1000);
708 end_ebml_master(pb, tracks);
712 static int mkv_write_chapters(AVFormatContext *s)
714 MatroskaMuxContext *mkv = s->priv_data;
715 AVIOContext *pb = s->pb;
716 ebml_master chapters, editionentry;
717 AVRational scale = {1, 1E9};
720 if (!s->nb_chapters || mkv->wrote_chapters)
723 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
724 if (ret < 0) return ret;
726 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
727 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
728 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
729 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
730 for (i = 0; i < s->nb_chapters; i++) {
731 ebml_master chapteratom, chapterdisplay;
732 AVChapter *c = s->chapters[i];
733 AVDictionaryEntry *t = NULL;
735 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
736 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
737 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
738 av_rescale_q(c->start, c->time_base, scale));
739 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
740 av_rescale_q(c->end, c->time_base, scale));
741 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
742 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
743 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
744 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
745 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
746 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
747 end_ebml_master(pb, chapterdisplay);
749 end_ebml_master(pb, chapteratom);
751 end_ebml_master(pb, editionentry);
752 end_ebml_master(pb, chapters);
754 mkv->wrote_chapters = 1;
758 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
760 uint8_t *key = av_strdup(t->key);
762 const uint8_t *lang = NULL;
765 if ((p = strrchr(p, '-')) &&
766 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
773 else if (*p >= 'a' && *p <= 'z')
778 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
779 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
781 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
782 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
783 end_ebml_master(pb, tag);
788 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
789 unsigned int uid, ebml_master *tags)
791 MatroskaMuxContext *mkv = s->priv_data;
792 ebml_master tag, targets;
793 AVDictionaryEntry *t = NULL;
797 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
798 if (ret < 0) return ret;
800 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
803 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
804 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
806 put_ebml_uint(s->pb, elementid, uid);
807 end_ebml_master(s->pb, targets);
809 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
810 if (av_strcasecmp(t->key, "title"))
811 mkv_write_simpletag(s->pb, t);
813 end_ebml_master(s->pb, tag);
817 static int mkv_write_tags(AVFormatContext *s)
819 ebml_master tags = {0};
822 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
824 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
825 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
826 if (ret < 0) return ret;
829 for (i = 0; i < s->nb_streams; i++) {
830 AVStream *st = s->streams[i];
832 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
835 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
836 if (ret < 0) return ret;
839 for (i = 0; i < s->nb_chapters; i++) {
840 AVChapter *ch = s->chapters[i];
842 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
845 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
846 if (ret < 0) return ret;
850 end_ebml_master(s->pb, tags);
854 static int mkv_write_attachments(AVFormatContext *s)
856 MatroskaMuxContext *mkv = s->priv_data;
857 AVIOContext *pb = s->pb;
858 ebml_master attachments;
862 if (!mkv->have_attachments)
865 av_lfg_init(&c, av_get_random_seed());
867 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
868 if (ret < 0) return ret;
870 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
872 for (i = 0; i < s->nb_streams; i++) {
873 AVStream *st = s->streams[i];
874 ebml_master attached_file;
875 AVDictionaryEntry *t;
876 const char *mimetype = NULL;
878 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
881 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
883 if (t = av_dict_get(st->metadata, "title", NULL, 0))
884 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
885 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
886 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
887 return AVERROR(EINVAL);
889 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
890 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
892 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
894 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
895 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
896 mimetype = ff_mkv_mime_tags[i].str;
901 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
902 "it cannot be deduced from the codec id.\n", i);
903 return AVERROR(EINVAL);
906 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
907 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
908 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
909 end_ebml_master(pb, attached_file);
911 end_ebml_master(pb, attachments);
916 static int mkv_write_header(AVFormatContext *s)
918 MatroskaMuxContext *mkv = s->priv_data;
919 AVIOContext *pb = s->pb;
920 ebml_master ebml_header, segment_info;
921 AVDictionaryEntry *tag;
924 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
925 else mkv->mode = MODE_MATROSKAv2;
927 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
929 return AVERROR(ENOMEM);
931 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
932 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
933 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
934 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
935 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
936 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
937 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
938 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
939 end_ebml_master(pb, ebml_header);
941 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
942 mkv->segment_offset = avio_tell(pb);
944 // we write 2 seek heads - one at the end of the file to point to each
945 // cluster, and one at the beginning to point to all other level one
946 // elements (including the seek head at the end of the file), which
947 // isn't more than 10 elements if we only write one of each other
948 // currently defined level 1 element
949 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
950 if (!mkv->main_seekhead)
951 return AVERROR(ENOMEM);
953 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
954 if (ret < 0) return ret;
956 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
957 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
958 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
959 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
960 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
961 uint32_t segment_uid[4];
964 av_lfg_init(&lfg, av_get_random_seed());
966 for (i = 0; i < 4; i++)
967 segment_uid[i] = av_lfg_get(&lfg);
969 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
970 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
971 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
974 // reserve space for the duration
976 mkv->duration_offset = avio_tell(pb);
977 put_ebml_void(pb, 11); // assumes double-precision float to be written
978 end_ebml_master(pb, segment_info);
980 ret = mkv_write_tracks(s);
981 if (ret < 0) return ret;
983 if (mkv->mode != MODE_WEBM) {
984 ret = mkv_write_chapters(s);
985 if (ret < 0) return ret;
987 ret = mkv_write_tags(s);
988 if (ret < 0) return ret;
990 ret = mkv_write_attachments(s);
991 if (ret < 0) return ret;
994 if (!s->pb->seekable)
995 mkv_write_seekhead(pb, mkv->main_seekhead);
997 mkv->cues = mkv_start_cues(mkv->segment_offset);
998 if (mkv->cues == NULL)
999 return AVERROR(ENOMEM);
1001 if (pb->seekable && mkv->reserve_cues_space) {
1002 mkv->cues_pos = avio_tell(pb);
1003 put_ebml_void(pb, mkv->reserve_cues_space);
1006 av_init_packet(&mkv->cur_audio_pkt);
1007 mkv->cur_audio_pkt.size = 0;
1011 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1012 // after 4k and on a keyframe
1014 if (mkv->cluster_time_limit < 0)
1015 mkv->cluster_time_limit = 5000;
1016 if (mkv->cluster_size_limit < 0)
1017 mkv->cluster_size_limit = 5 * 1024 * 1024;
1019 if (mkv->cluster_time_limit < 0)
1020 mkv->cluster_time_limit = 1000;
1021 if (mkv->cluster_size_limit < 0)
1022 mkv->cluster_size_limit = 32 * 1024;
1028 static int mkv_blockgroup_size(int pkt_size)
1030 int size = pkt_size + 4;
1031 size += ebml_num_size(size);
1032 size += 2; // EBML ID for block and block duration
1033 size += 8; // max size of block duration
1034 size += ebml_num_size(size);
1035 size += 1; // blockgroup EBML ID
1039 static int ass_get_duration(const uint8_t *p)
1041 int sh, sm, ss, sc, eh, em, es, ec;
1042 uint64_t start, end;
1044 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1045 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1047 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1048 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1052 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1054 MatroskaMuxContext *mkv = s->priv_data;
1055 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1056 uint8_t *start, *end, *data = pkt->data;
1057 ebml_master blockgroup;
1061 int duration = ass_get_duration(data);
1062 max_duration = FFMAX(duration, max_duration);
1063 end = memchr(data, '\n', data_size);
1064 size = line_size = end ? end-data+1 : data_size;
1065 size -= end ? (end[-1]=='\r')+1 : 0;
1067 for (i=0; i<3; i++, start++)
1068 if (!(start = memchr(start, ',', size-(start-data))))
1069 return max_duration;
1070 size -= start - data;
1071 sscanf(data, "Dialogue: %d,", &layer);
1072 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1073 s->streams[pkt->stream_index]->nb_frames, layer);
1074 size = FFMIN(i+size, sizeof(buffer));
1075 memcpy(buffer+i, start, size-i);
1077 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1078 "pts %" PRId64 ", duration %d\n",
1079 avio_tell(pb), size, pkt->pts, duration);
1080 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1081 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1082 put_ebml_num(pb, size+4, 0);
1083 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1084 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1086 avio_write(pb, buffer, size);
1087 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1088 end_ebml_master(pb, blockgroup);
1091 data_size -= line_size;
1094 return max_duration;
1097 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1104 dst = av_malloc(srclen);
1106 return AVERROR(ENOMEM);
1108 while (srclen >= WV_HEADER_SIZE) {
1111 ret = ff_wv_parse_header(&header, src);
1114 src += WV_HEADER_SIZE;
1115 srclen -= WV_HEADER_SIZE;
1117 if (srclen < header.blocksize) {
1118 ret = AVERROR_INVALIDDATA;
1122 if (header.initial) {
1123 AV_WL32(dst + offset, header.samples);
1126 AV_WL32(dst + offset, header.flags);
1127 AV_WL32(dst + offset + 4, header.crc);
1130 if (!(header.initial && header.final)) {
1131 AV_WL32(dst + offset, header.blocksize);
1135 memcpy(dst + offset, src, header.blocksize);
1136 src += header.blocksize;
1137 srclen -= header.blocksize;
1138 offset += header.blocksize;
1150 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1151 unsigned int blockid, AVPacket *pkt, int flags)
1153 MatroskaMuxContext *mkv = s->priv_data;
1154 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1155 uint8_t *data = NULL;
1156 int offset = 0, size = pkt->size;
1157 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1159 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1160 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1161 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1162 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1163 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1164 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1165 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1166 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1168 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1174 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1175 /* Matroska specification requires to remove the first QuickTime atom
1181 put_ebml_id(pb, blockid);
1182 put_ebml_num(pb, size+4, 0);
1183 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1184 avio_wb16(pb, ts - mkv->cluster_pts);
1186 avio_write(pb, data + offset, size);
1187 if (data != pkt->data)
1191 static int srt_get_duration(uint8_t **buf)
1193 int i, duration = 0;
1195 for (i=0; i<2 && !duration; i++) {
1196 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1197 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1198 &s_hour, &s_min, &s_sec, &s_hsec,
1199 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1200 s_min += 60*s_hour; e_min += 60*e_hour;
1201 s_sec += 60*s_min; e_sec += 60*e_min;
1202 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1203 duration = e_hsec - s_hsec;
1205 *buf += strcspn(*buf, "\n") + 1;
1210 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1212 ebml_master blockgroup;
1213 AVPacket pkt2 = *pkt;
1214 int64_t duration = srt_get_duration(&pkt2.data);
1215 pkt2.size -= pkt2.data - pkt->data;
1217 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1218 mkv_blockgroup_size(pkt2.size));
1219 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1220 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1221 end_ebml_master(pb, blockgroup);
1226 static void mkv_flush_dynbuf(AVFormatContext *s)
1228 MatroskaMuxContext *mkv = s->priv_data;
1235 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1236 avio_write(s->pb, dyn_buf, bufsize);
1241 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1243 MatroskaMuxContext *mkv = s->priv_data;
1244 AVIOContext *pb = s->pb;
1245 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1246 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1247 int duration = pkt->duration;
1249 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1251 if (ts == AV_NOPTS_VALUE) {
1252 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1253 return AVERROR(EINVAL);
1256 if (!s->pb->seekable) {
1258 avio_open_dyn_buf(&mkv->dyn_bc);
1262 if (!mkv->cluster_pos) {
1263 mkv->cluster_pos = avio_tell(s->pb);
1264 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1265 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1266 mkv->cluster_pts = FFMAX(0, ts);
1269 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1270 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1271 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1272 duration = mkv_write_ass_blocks(s, pb, pkt);
1273 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1274 duration = mkv_write_srt_blocks(s, pb, pkt);
1276 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1277 duration = pkt->convergence_duration;
1278 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1279 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1280 end_ebml_master(pb, blockgroup);
1283 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1284 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1285 if (ret < 0) return ret;
1288 mkv->duration = FFMAX(mkv->duration, ts + duration);
1292 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1294 MatroskaMuxContext *mkv = s->priv_data;
1295 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1296 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1298 int64_t cluster_time;
1302 if (mkv->tracks[pkt->stream_index].write_dts)
1303 cluster_time = pkt->dts - mkv->cluster_pts;
1305 cluster_time = pkt->pts - mkv->cluster_pts;
1307 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1308 // after 4k and on a keyframe
1309 if (s->pb->seekable) {
1311 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1314 cluster_size = avio_tell(pb);
1317 if (mkv->cluster_pos &&
1318 (cluster_size > mkv->cluster_size_limit ||
1319 cluster_time > mkv->cluster_time_limit ||
1320 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1321 cluster_size > 4 * 1024))) {
1322 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1323 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1324 avio_tell(pb), pkt->pts, pkt->dts);
1325 end_ebml_master(pb, mkv->cluster);
1326 mkv->cluster_pos = 0;
1328 mkv_flush_dynbuf(s);
1332 // check if we have an audio packet cached
1333 if (mkv->cur_audio_pkt.size > 0) {
1334 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1335 av_free_packet(&mkv->cur_audio_pkt);
1337 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1342 // buffer an audio packet to ensure the packet containing the video
1343 // keyframe's timecode is contained in the same cluster for WebM
1344 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1345 mkv->cur_audio_pkt = *pkt;
1347 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1348 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1350 ret = av_dup_packet(&mkv->cur_audio_pkt);
1352 ret = mkv_write_packet_internal(s, pkt);
1356 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1358 MatroskaMuxContext *mkv = s->priv_data;
1360 if (s->pb->seekable)
1365 if (mkv->cluster_pos) {
1366 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1367 " bytes\n", avio_tell(pb));
1368 end_ebml_master(pb, mkv->cluster);
1369 mkv->cluster_pos = 0;
1371 mkv_flush_dynbuf(s);
1376 return mkv_write_packet(s, pkt);
1379 static int mkv_write_trailer(AVFormatContext *s)
1381 MatroskaMuxContext *mkv = s->priv_data;
1382 AVIOContext *pb = s->pb;
1383 int64_t currentpos, cuespos;
1386 // check if we have an audio packet cached
1387 if (mkv->cur_audio_pkt.size > 0) {
1388 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1389 av_free_packet(&mkv->cur_audio_pkt);
1391 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1397 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1398 mkv_flush_dynbuf(s);
1399 } else if (mkv->cluster_pos) {
1400 end_ebml_master(pb, mkv->cluster);
1403 if (mkv->mode != MODE_WEBM) {
1404 ret = mkv_write_chapters(s);
1405 if (ret < 0) return ret;
1409 if (mkv->cues->num_entries) {
1410 if (mkv->reserve_cues_space) {
1413 currentpos = avio_tell(pb);
1414 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1416 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1417 cues_end = avio_tell(pb);
1418 if (cues_end > cuespos + mkv->reserve_cues_space) {
1419 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1420 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1421 cues_end - cuespos);
1422 return AVERROR(EINVAL);
1425 if (cues_end < cuespos + mkv->reserve_cues_space)
1426 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1428 avio_seek(pb, currentpos, SEEK_SET);
1430 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1433 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1434 if (ret < 0) return ret;
1437 mkv_write_seekhead(pb, mkv->main_seekhead);
1439 // update the duration
1440 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1441 currentpos = avio_tell(pb);
1442 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1443 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1445 avio_seek(pb, currentpos, SEEK_SET);
1448 end_ebml_master(pb, mkv->segment);
1449 av_free(mkv->tracks);
1450 av_freep(&mkv->cues->entries);
1451 av_freep(&mkv->cues);
1456 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1459 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1460 if (ff_mkv_codec_tags[i].id == codec_id)
1463 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1464 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1465 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1472 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1473 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1474 static const AVOption options[] = {
1475 { "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 },
1476 { "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 },
1477 { "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 },
1481 #if CONFIG_MATROSKA_MUXER
1482 static const AVClass matroska_class = {
1483 .class_name = "matroska muxer",
1484 .item_name = av_default_item_name,
1486 .version = LIBAVUTIL_VERSION_INT,
1489 AVOutputFormat ff_matroska_muxer = {
1491 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1492 .mime_type = "video/x-matroska",
1493 .extensions = "mkv",
1494 .priv_data_size = sizeof(MatroskaMuxContext),
1495 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1496 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1497 .video_codec = CONFIG_LIBX264_ENCODER ?
1498 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1499 .write_header = mkv_write_header,
1500 .write_packet = mkv_write_flush_packet,
1501 .write_trailer = mkv_write_trailer,
1502 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1503 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1504 .codec_tag = (const AVCodecTag* const []){
1505 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1507 .subtitle_codec = AV_CODEC_ID_SSA,
1508 .query_codec = mkv_query_codec,
1509 .priv_class = &matroska_class,
1513 #if CONFIG_WEBM_MUXER
1514 static const AVClass webm_class = {
1515 .class_name = "webm muxer",
1516 .item_name = av_default_item_name,
1518 .version = LIBAVUTIL_VERSION_INT,
1521 AVOutputFormat ff_webm_muxer = {
1523 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1524 .mime_type = "video/webm",
1525 .extensions = "webm",
1526 .priv_data_size = sizeof(MatroskaMuxContext),
1527 .audio_codec = AV_CODEC_ID_VORBIS,
1528 .video_codec = AV_CODEC_ID_VP8,
1529 .write_header = mkv_write_header,
1530 .write_packet = mkv_write_flush_packet,
1531 .write_trailer = mkv_write_trailer,
1532 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1533 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1534 .priv_class = &webm_class,
1538 #if CONFIG_MATROSKA_AUDIO_MUXER
1539 static const AVClass mka_class = {
1540 .class_name = "matroska audio muxer",
1541 .item_name = av_default_item_name,
1543 .version = LIBAVUTIL_VERSION_INT,
1545 AVOutputFormat ff_matroska_audio_muxer = {
1547 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1548 .mime_type = "audio/x-matroska",
1549 .extensions = "mka",
1550 .priv_data_size = sizeof(MatroskaMuxContext),
1551 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1552 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1553 .video_codec = AV_CODEC_ID_NONE,
1554 .write_header = mkv_write_header,
1555 .write_packet = mkv_write_flush_packet,
1556 .write_trailer = mkv_write_trailer,
1557 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1559 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1560 .priv_class = &mka_class,