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
27 #include "avlanguage.h"
35 #include "libavutil/avstring.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/intfloat.h"
38 #include "libavutil/intreadwrite.h"
39 #include "libavutil/lfg.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/opt.h"
42 #include "libavutil/random_seed.h"
43 #include "libavutil/samplefmt.h"
45 #include "libavcodec/xiph.h"
46 #include "libavcodec/mpeg4audio.h"
48 typedef struct ebml_master {
49 int64_t pos; ///< absolute offset in the file where the master's elements start
50 int sizebytes; ///< how many bytes were reserved for the size
53 typedef struct mkv_seekhead_entry {
54 unsigned int elementid;
58 typedef struct mkv_seekhead {
60 int64_t segment_offset; ///< the file offset to the beginning of the segment
61 int reserved_size; ///< -1 if appending to file
63 mkv_seekhead_entry *entries;
70 int64_t cluster_pos; ///< file offset of the cluster containing the block
74 int64_t segment_offset;
75 mkv_cuepoint *entries;
83 #define MODE_MATROSKAv2 0x01
84 #define MODE_WEBM 0x02
86 typedef struct MatroskaMuxContext {
91 int64_t segment_offset;
93 int64_t cluster_pos; ///< file offset of the current cluster
95 int64_t duration_offset;
97 mkv_seekhead *main_seekhead;
101 AVPacket cur_audio_pkt;
103 int have_attachments;
105 int reserve_cues_space;
106 int cluster_size_limit;
108 int64_t cluster_time_limit;
110 } MatroskaMuxContext;
113 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
114 * offset, 4 bytes for target EBML ID */
115 #define MAX_SEEKENTRY_SIZE 21
117 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
119 #define MAX_CUETRACKPOS_SIZE 22
121 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
122 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
125 static int ebml_id_size(unsigned int id)
127 return (av_log2(id+1)-1)/7+1;
130 static void put_ebml_id(AVIOContext *pb, unsigned int id)
132 int i = ebml_id_size(id);
134 avio_w8(pb, id >> (i*8));
138 * Write an EBML size meaning "unknown size".
140 * @param bytes The number of bytes the size should occupy (maximum: 8).
142 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
145 avio_w8(pb, 0x1ff >> bytes);
151 * Calculate how many bytes are needed to represent a given number in EBML.
153 static int ebml_num_size(uint64_t num)
156 while ((num+1) >> bytes*7) bytes++;
161 * Write a number in EBML variable length format.
163 * @param bytes The number of bytes that need to be used to write the number.
164 * If zero, any number of bytes can be used.
166 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
168 int i, needed_bytes = ebml_num_size(num);
170 // sizes larger than this are currently undefined in EBML
171 assert(num < (1ULL<<56)-1);
174 // don't care how many bytes are used, so use the min
175 bytes = needed_bytes;
176 // the bytes needed to write the given size would exceed the bytes
177 // that we need to use, so write unknown size. This shouldn't happen.
178 assert(bytes >= needed_bytes);
180 num |= 1ULL << bytes*7;
181 for (i = bytes - 1; i >= 0; i--)
182 avio_w8(pb, num >> i*8);
185 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
189 while (tmp>>=8) bytes++;
191 put_ebml_id(pb, elementid);
192 put_ebml_num(pb, bytes, 0);
193 for (i = bytes - 1; i >= 0; i--)
194 avio_w8(pb, val >> i*8);
197 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
199 put_ebml_id(pb, elementid);
200 put_ebml_num(pb, 8, 0);
201 avio_wb64(pb, av_double2int(val));
204 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
205 const void *buf, int size)
207 put_ebml_id(pb, elementid);
208 put_ebml_num(pb, size, 0);
209 avio_write(pb, buf, size);
212 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
214 put_ebml_binary(pb, elementid, str, strlen(str));
218 * Write a void element of a given size. Useful for reserving space in
219 * the file to be written to later.
221 * @param size The number of bytes to reserve, which must be at least 2.
223 static void put_ebml_void(AVIOContext *pb, uint64_t size)
225 int64_t currentpos = avio_tell(pb);
229 put_ebml_id(pb, EBML_ID_VOID);
230 // we need to subtract the length needed to store the size from the
231 // size we need to reserve so 2 cases, we use 8 bytes to store the
232 // size if possible, 1 byte otherwise
234 put_ebml_num(pb, size-1, 0);
236 put_ebml_num(pb, size-9, 8);
237 while(avio_tell(pb) < currentpos + size)
241 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
243 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
244 put_ebml_id(pb, elementid);
245 put_ebml_size_unknown(pb, bytes);
246 return (ebml_master){ avio_tell(pb), bytes };
249 static void end_ebml_master(AVIOContext *pb, ebml_master master)
251 int64_t pos = avio_tell(pb);
253 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
255 put_ebml_num(pb, pos - master.pos, master.sizebytes);
256 avio_seek(pb, pos, SEEK_SET);
259 static void put_xiph_size(AVIOContext *pb, int size)
262 for (i = 0; i < size / 255; i++)
264 avio_w8(pb, size % 255);
268 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
269 * elements. If a maximum number of elements is specified, enough space
270 * will be reserved at the current file location to write a seek head of
273 * @param segment_offset The absolute offset to the position in the file
274 * where the segment begins.
275 * @param numelements The maximum number of elements that will be indexed
276 * by this seek head, 0 if unlimited.
278 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
280 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
281 if (new_seekhead == NULL)
284 new_seekhead->segment_offset = segment_offset;
286 if (numelements > 0) {
287 new_seekhead->filepos = avio_tell(pb);
288 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
289 // and size, and 3 bytes to guarantee that an EBML void element
290 // will fit afterwards
291 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
292 new_seekhead->max_entries = numelements;
293 put_ebml_void(pb, new_seekhead->reserved_size);
298 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
302 // don't store more elements than we reserved space for
303 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
306 if ((err = av_reallocp_array(&seekhead->entries, seekhead->num_entries + 1,
307 sizeof(*seekhead->entries))) < 0) {
308 seekhead->num_entries = 0;
312 seekhead->entries[seekhead->num_entries].elementid = elementid;
313 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
319 * Write the seek head to the file and free it. If a maximum number of
320 * elements was specified to mkv_start_seekhead(), the seek head will
321 * be written at the location reserved for it. Otherwise, it is written
322 * at the current location in the file.
324 * @return The file offset where the seekhead was written,
325 * -1 if an error occurred.
327 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
329 ebml_master metaseek, seekentry;
333 currentpos = avio_tell(pb);
335 if (seekhead->reserved_size > 0) {
336 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
342 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
343 for (i = 0; i < seekhead->num_entries; i++) {
344 mkv_seekhead_entry *entry = &seekhead->entries[i];
346 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
348 put_ebml_id(pb, MATROSKA_ID_SEEKID);
349 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
350 put_ebml_id(pb, entry->elementid);
352 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
353 end_ebml_master(pb, seekentry);
355 end_ebml_master(pb, metaseek);
357 if (seekhead->reserved_size > 0) {
358 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
359 put_ebml_void(pb, remaining);
360 avio_seek(pb, currentpos, SEEK_SET);
362 currentpos = seekhead->filepos;
365 av_free(seekhead->entries);
371 static mkv_cues * mkv_start_cues(int64_t segment_offset)
373 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
377 cues->segment_offset = segment_offset;
381 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
388 if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
389 sizeof(*cues->entries))) < 0) {
390 cues->num_entries = 0;
394 cues->entries[cues->num_entries].pts = ts;
395 cues->entries[cues->num_entries].tracknum = stream + 1;
396 cues->entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
401 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
403 ebml_master cues_element;
407 currentpos = avio_tell(pb);
408 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
410 for (i = 0; i < cues->num_entries; i++) {
411 ebml_master cuepoint, track_positions;
412 mkv_cuepoint *entry = &cues->entries[i];
413 uint64_t pts = entry->pts;
415 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
416 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
418 // put all the entries from different tracks that have the exact same
419 // timestamp into the same CuePoint
420 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
421 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
422 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
423 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
424 end_ebml_master(pb, track_positions);
427 end_ebml_master(pb, cuepoint);
429 end_ebml_master(pb, cues_element);
434 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
436 uint8_t *header_start[3];
438 int first_header_size;
441 if (codec->codec_id == AV_CODEC_ID_VORBIS)
442 first_header_size = 30;
444 first_header_size = 42;
446 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
447 first_header_size, header_start, header_len) < 0) {
448 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
452 avio_w8(pb, 2); // number packets - 1
453 for (j = 0; j < 2; j++) {
454 put_xiph_size(pb, header_len[j]);
456 for (j = 0; j < 3; j++)
457 avio_write(pb, header_start[j], header_len[j]);
462 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
464 if (codec->extradata && codec->extradata_size == 2)
465 avio_write(pb, codec->extradata, 2);
467 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
471 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
473 MPEG4AudioConfig mp4ac;
475 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
476 codec->extradata_size * 8, 1) < 0) {
477 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
481 *sample_rate = mp4ac.sample_rate;
482 *output_sample_rate = mp4ac.ext_sample_rate;
485 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
489 int ret, codecpriv_size;
491 ret = avio_open_dyn_buf(&dyn_cp);
496 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
497 ret = put_xiph_codecpriv(s, dyn_cp, codec);
498 else if (codec->codec_id == AV_CODEC_ID_FLAC)
499 ret = ff_flac_write_header(dyn_cp, codec, 1);
500 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
501 ret = put_wv_codecpriv(dyn_cp, codec);
502 else if (codec->codec_id == AV_CODEC_ID_H264)
503 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
504 else if (codec->codec_id == AV_CODEC_ID_HEVC)
505 ret = ff_isom_write_hvcc(dyn_cp, codec->extradata, codec->extradata_size, 0);
506 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
507 if (codec->extradata_size < 36) {
508 av_log(s, AV_LOG_ERROR,
509 "Invalid extradata found, ALAC expects a 36-byte "
511 ret = AVERROR_INVALIDDATA;
513 avio_write(dyn_cp, codec->extradata + 12,
514 codec->extradata_size - 12);
516 else if (codec->extradata_size)
517 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
518 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
520 if (!codec->codec_tag)
521 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
522 if (codec->extradata_size)
523 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
525 if (!codec->codec_tag)
526 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
527 if (!codec->codec_tag) {
528 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
532 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
535 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
537 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
539 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
542 if (!codec->codec_tag)
543 codec->codec_tag = tag;
545 ff_put_wav_header(dyn_cp, codec);
548 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
550 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
555 static int mkv_write_tracks(AVFormatContext *s)
557 MatroskaMuxContext *mkv = s->priv_data;
558 AVIOContext *pb = s->pb;
562 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
563 if (ret < 0) return ret;
565 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
566 for (i = 0; i < s->nb_streams; i++) {
567 AVStream *st = s->streams[i];
568 AVCodecContext *codec = st->codec;
569 ebml_master subinfo, track;
572 int bit_depth = av_get_bits_per_sample(codec->codec_id);
573 int sample_rate = codec->sample_rate;
574 int output_sample_rate = 0;
575 AVDictionaryEntry *tag;
577 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
578 mkv->have_attachments = 1;
583 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
585 if (codec->codec_id == AV_CODEC_ID_AAC)
586 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
588 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
589 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
590 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
591 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
593 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
594 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
595 tag = av_dict_get(st->metadata, "language", NULL, 0);
596 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
598 // The default value for TRACKFLAGDEFAULT is 1, so add element
599 // if we need to clear it.
600 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
601 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
603 // look for a codec ID string specific to mkv to use,
604 // if none are found, use AVI codes
605 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
606 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
607 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
613 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
614 codec->codec_id == AV_CODEC_ID_VORBIS)) {
615 av_log(s, AV_LOG_ERROR,
616 "Only VP8 video and Vorbis audio are supported for WebM.\n");
617 return AVERROR(EINVAL);
620 switch (codec->codec_type) {
621 case AVMEDIA_TYPE_VIDEO:
622 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
623 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
626 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
627 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
628 || codec->codec_id == AV_CODEC_ID_SVQ1
629 || codec->codec_id == AV_CODEC_ID_SVQ3
630 || codec->codec_id == AV_CODEC_ID_CINEPAK))
634 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
635 else if (!native_id) {
636 // if there is no mkv-specific codec ID, use VFW mode
637 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
638 mkv->tracks[i].write_dts = 1;
641 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
642 // XXX: interlace flag?
643 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
644 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
645 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
646 uint8_t stereo_fmt = atoi(tag->value);
651 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM
652 || stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
655 case MODE_MATROSKAv2:
656 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
662 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
664 if (st->sample_aspect_ratio.num) {
665 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
666 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
667 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
668 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
670 end_ebml_master(pb, subinfo);
673 case AVMEDIA_TYPE_AUDIO:
674 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
677 // no mkv-specific ID, use ACM mode
678 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
680 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
681 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
682 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
683 if (output_sample_rate)
684 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
686 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
687 end_ebml_master(pb, subinfo);
690 case AVMEDIA_TYPE_SUBTITLE:
691 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
693 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
694 return AVERROR(ENOSYS);
698 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
701 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
702 if (ret < 0) return ret;
704 end_ebml_master(pb, track);
706 // ms precision is the de-facto standard timescale for mkv files
707 avpriv_set_pts_info(st, 64, 1, 1000);
709 end_ebml_master(pb, tracks);
713 static int mkv_write_chapters(AVFormatContext *s)
715 MatroskaMuxContext *mkv = s->priv_data;
716 AVIOContext *pb = s->pb;
717 ebml_master chapters, editionentry;
718 AVRational scale = {1, 1E9};
721 if (!s->nb_chapters || mkv->wrote_chapters)
724 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
725 if (ret < 0) return ret;
727 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
728 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
729 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
730 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
731 for (i = 0; i < s->nb_chapters; i++) {
732 ebml_master chapteratom, chapterdisplay;
733 AVChapter *c = s->chapters[i];
734 AVDictionaryEntry *t = NULL;
736 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
737 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
738 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
739 av_rescale_q(c->start, c->time_base, scale));
740 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
741 av_rescale_q(c->end, c->time_base, scale));
742 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
743 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
744 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
745 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
746 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
747 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
748 end_ebml_master(pb, chapterdisplay);
750 end_ebml_master(pb, chapteratom);
752 end_ebml_master(pb, editionentry);
753 end_ebml_master(pb, chapters);
755 mkv->wrote_chapters = 1;
759 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
761 uint8_t *key = av_strdup(t->key);
763 const uint8_t *lang = NULL;
766 if ((p = strrchr(p, '-')) &&
767 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
774 else if (*p >= 'a' && *p <= 'z')
779 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
780 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
782 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
783 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
784 end_ebml_master(pb, tag);
789 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
790 unsigned int uid, ebml_master *tags)
792 MatroskaMuxContext *mkv = s->priv_data;
793 ebml_master tag, targets;
794 AVDictionaryEntry *t = NULL;
798 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
799 if (ret < 0) return ret;
801 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
804 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
805 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
807 put_ebml_uint(s->pb, elementid, uid);
808 end_ebml_master(s->pb, targets);
810 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
811 if (av_strcasecmp(t->key, "title") &&
812 av_strcasecmp(t->key, "encoding_tool"))
813 mkv_write_simpletag(s->pb, t);
815 end_ebml_master(s->pb, tag);
819 static int mkv_write_tags(AVFormatContext *s)
821 ebml_master tags = {0};
824 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
826 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
827 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
828 if (ret < 0) return ret;
831 for (i = 0; i < s->nb_streams; i++) {
832 AVStream *st = s->streams[i];
834 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
837 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
838 if (ret < 0) return ret;
841 for (i = 0; i < s->nb_chapters; i++) {
842 AVChapter *ch = s->chapters[i];
844 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
847 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
848 if (ret < 0) return ret;
852 end_ebml_master(s->pb, tags);
856 static int mkv_write_attachments(AVFormatContext *s)
858 MatroskaMuxContext *mkv = s->priv_data;
859 AVIOContext *pb = s->pb;
860 ebml_master attachments;
864 if (!mkv->have_attachments)
867 av_lfg_init(&c, av_get_random_seed());
869 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
870 if (ret < 0) return ret;
872 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
874 for (i = 0; i < s->nb_streams; i++) {
875 AVStream *st = s->streams[i];
876 ebml_master attached_file;
877 AVDictionaryEntry *t;
878 const char *mimetype = NULL;
880 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
883 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
885 if (t = av_dict_get(st->metadata, "title", NULL, 0))
886 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
887 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
888 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
889 return AVERROR(EINVAL);
891 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
892 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
894 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
896 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
897 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
898 mimetype = ff_mkv_mime_tags[i].str;
903 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
904 "it cannot be deduced from the codec id.\n", i);
905 return AVERROR(EINVAL);
908 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
909 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
910 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
911 end_ebml_master(pb, attached_file);
913 end_ebml_master(pb, attachments);
918 static int mkv_write_header(AVFormatContext *s)
920 MatroskaMuxContext *mkv = s->priv_data;
921 AVIOContext *pb = s->pb;
922 ebml_master ebml_header, segment_info;
923 AVDictionaryEntry *tag;
926 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
927 else mkv->mode = MODE_MATROSKAv2;
929 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
931 return AVERROR(ENOMEM);
933 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
934 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
935 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
936 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
937 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
938 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
939 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
940 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
941 end_ebml_master(pb, ebml_header);
943 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
944 mkv->segment_offset = avio_tell(pb);
946 // we write 2 seek heads - one at the end of the file to point to each
947 // cluster, and one at the beginning to point to all other level one
948 // elements (including the seek head at the end of the file), which
949 // isn't more than 10 elements if we only write one of each other
950 // currently defined level 1 element
951 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
952 if (!mkv->main_seekhead)
953 return AVERROR(ENOMEM);
955 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
956 if (ret < 0) return ret;
958 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
959 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
960 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
961 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
962 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
963 uint32_t segment_uid[4];
966 av_lfg_init(&lfg, av_get_random_seed());
968 for (i = 0; i < 4; i++)
969 segment_uid[i] = av_lfg_get(&lfg);
971 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
972 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
973 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
975 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
976 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
979 // reserve space for the duration
981 mkv->duration_offset = avio_tell(pb);
982 put_ebml_void(pb, 11); // assumes double-precision float to be written
983 end_ebml_master(pb, segment_info);
985 ret = mkv_write_tracks(s);
986 if (ret < 0) return ret;
988 if (mkv->mode != MODE_WEBM) {
989 ret = mkv_write_chapters(s);
990 if (ret < 0) return ret;
992 ret = mkv_write_tags(s);
993 if (ret < 0) return ret;
995 ret = mkv_write_attachments(s);
996 if (ret < 0) return ret;
999 if (!s->pb->seekable)
1000 mkv_write_seekhead(pb, mkv->main_seekhead);
1002 mkv->cues = mkv_start_cues(mkv->segment_offset);
1003 if (mkv->cues == NULL)
1004 return AVERROR(ENOMEM);
1006 if (pb->seekable && mkv->reserve_cues_space) {
1007 mkv->cues_pos = avio_tell(pb);
1008 put_ebml_void(pb, mkv->reserve_cues_space);
1011 av_init_packet(&mkv->cur_audio_pkt);
1012 mkv->cur_audio_pkt.size = 0;
1016 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1017 // after 4k and on a keyframe
1019 if (mkv->cluster_time_limit < 0)
1020 mkv->cluster_time_limit = 5000;
1021 if (mkv->cluster_size_limit < 0)
1022 mkv->cluster_size_limit = 5 * 1024 * 1024;
1024 if (mkv->cluster_time_limit < 0)
1025 mkv->cluster_time_limit = 1000;
1026 if (mkv->cluster_size_limit < 0)
1027 mkv->cluster_size_limit = 32 * 1024;
1033 static int mkv_blockgroup_size(int pkt_size)
1035 int size = pkt_size + 4;
1036 size += ebml_num_size(size);
1037 size += 2; // EBML ID for block and block duration
1038 size += 8; // max size of block duration
1039 size += ebml_num_size(size);
1040 size += 1; // blockgroup EBML ID
1044 static int ass_get_duration(const uint8_t *p)
1046 int sh, sm, ss, sc, eh, em, es, ec;
1047 uint64_t start, end;
1049 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1050 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1052 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1053 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1057 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1059 MatroskaMuxContext *mkv = s->priv_data;
1060 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1061 uint8_t *start, *end, *data = pkt->data;
1062 ebml_master blockgroup;
1066 int duration = ass_get_duration(data);
1067 max_duration = FFMAX(duration, max_duration);
1068 end = memchr(data, '\n', data_size);
1069 size = line_size = end ? end-data+1 : data_size;
1070 size -= end ? (end[-1]=='\r')+1 : 0;
1072 for (i=0; i<3; i++, start++)
1073 if (!(start = memchr(start, ',', size-(start-data))))
1074 return max_duration;
1075 size -= start - data;
1076 sscanf(data, "Dialogue: %d,", &layer);
1077 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1078 s->streams[pkt->stream_index]->nb_frames, layer);
1079 size = FFMIN(i+size, sizeof(buffer));
1080 memcpy(buffer+i, start, size-i);
1082 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1083 "pts %" PRId64 ", duration %d\n",
1084 avio_tell(pb), size, pkt->pts, duration);
1085 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1086 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1087 put_ebml_num(pb, size+4, 0);
1088 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1089 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1091 avio_write(pb, buffer, size);
1092 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1093 end_ebml_master(pb, blockgroup);
1096 data_size -= line_size;
1099 return max_duration;
1102 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1109 dst = av_malloc(srclen);
1111 return AVERROR(ENOMEM);
1113 while (srclen >= WV_HEADER_SIZE) {
1116 ret = ff_wv_parse_header(&header, src);
1119 src += WV_HEADER_SIZE;
1120 srclen -= WV_HEADER_SIZE;
1122 if (srclen < header.blocksize) {
1123 ret = AVERROR_INVALIDDATA;
1127 if (header.initial) {
1128 AV_WL32(dst + offset, header.samples);
1131 AV_WL32(dst + offset, header.flags);
1132 AV_WL32(dst + offset + 4, header.crc);
1135 if (!(header.initial && header.final)) {
1136 AV_WL32(dst + offset, header.blocksize);
1140 memcpy(dst + offset, src, header.blocksize);
1141 src += header.blocksize;
1142 srclen -= header.blocksize;
1143 offset += header.blocksize;
1155 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1156 unsigned int blockid, AVPacket *pkt, int flags)
1158 MatroskaMuxContext *mkv = s->priv_data;
1159 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1160 uint8_t *data = NULL;
1161 int offset = 0, size = pkt->size;
1162 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1164 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1165 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1166 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1167 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1168 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1169 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1170 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1171 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1172 /* extradata is Annex B, assume the bitstream is too and convert it */
1173 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1174 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1175 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1177 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1183 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1184 /* Matroska specification requires to remove the first QuickTime atom
1190 put_ebml_id(pb, blockid);
1191 put_ebml_num(pb, size+4, 0);
1192 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1193 avio_wb16(pb, ts - mkv->cluster_pts);
1195 avio_write(pb, data + offset, size);
1196 if (data != pkt->data)
1200 static int srt_get_duration(uint8_t **buf)
1202 int i, duration = 0;
1204 for (i=0; i<2 && !duration; i++) {
1205 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1206 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1207 &s_hour, &s_min, &s_sec, &s_hsec,
1208 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1209 s_min += 60*s_hour; e_min += 60*e_hour;
1210 s_sec += 60*s_min; e_sec += 60*e_min;
1211 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1212 duration = e_hsec - s_hsec;
1214 *buf += strcspn(*buf, "\n") + 1;
1219 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1221 ebml_master blockgroup;
1222 AVPacket pkt2 = *pkt;
1223 int64_t duration = srt_get_duration(&pkt2.data);
1224 pkt2.size -= pkt2.data - pkt->data;
1226 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1227 mkv_blockgroup_size(pkt2.size));
1228 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1229 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1230 end_ebml_master(pb, blockgroup);
1235 static void mkv_flush_dynbuf(AVFormatContext *s)
1237 MatroskaMuxContext *mkv = s->priv_data;
1244 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1245 avio_write(s->pb, dyn_buf, bufsize);
1250 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1252 MatroskaMuxContext *mkv = s->priv_data;
1253 AVIOContext *pb = s->pb;
1254 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1255 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1256 int duration = pkt->duration;
1258 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1260 if (ts == AV_NOPTS_VALUE) {
1261 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1262 return AVERROR(EINVAL);
1265 if (!s->pb->seekable) {
1267 avio_open_dyn_buf(&mkv->dyn_bc);
1271 if (!mkv->cluster_pos) {
1272 mkv->cluster_pos = avio_tell(s->pb);
1273 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1274 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1275 mkv->cluster_pts = FFMAX(0, ts);
1278 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1279 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1280 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1281 duration = mkv_write_ass_blocks(s, pb, pkt);
1282 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1283 duration = mkv_write_srt_blocks(s, pb, pkt);
1285 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1286 duration = pkt->convergence_duration;
1287 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1288 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1289 end_ebml_master(pb, blockgroup);
1292 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1293 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1294 if (ret < 0) return ret;
1297 mkv->duration = FFMAX(mkv->duration, ts + duration);
1301 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1303 MatroskaMuxContext *mkv = s->priv_data;
1304 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1305 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1307 int64_t cluster_time;
1311 if (mkv->tracks[pkt->stream_index].write_dts)
1312 cluster_time = pkt->dts - mkv->cluster_pts;
1314 cluster_time = pkt->pts - mkv->cluster_pts;
1316 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1317 // after 4k and on a keyframe
1318 if (s->pb->seekable) {
1320 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1323 cluster_size = avio_tell(pb);
1326 if (mkv->cluster_pos &&
1327 (cluster_size > mkv->cluster_size_limit ||
1328 cluster_time > mkv->cluster_time_limit ||
1329 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1330 cluster_size > 4 * 1024))) {
1331 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1332 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1333 avio_tell(pb), pkt->pts, pkt->dts);
1334 end_ebml_master(pb, mkv->cluster);
1335 mkv->cluster_pos = 0;
1337 mkv_flush_dynbuf(s);
1341 // check if we have an audio packet cached
1342 if (mkv->cur_audio_pkt.size > 0) {
1343 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1344 av_free_packet(&mkv->cur_audio_pkt);
1346 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1351 // buffer an audio packet to ensure the packet containing the video
1352 // keyframe's timecode is contained in the same cluster for WebM
1353 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1354 mkv->cur_audio_pkt = *pkt;
1356 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1357 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1359 ret = av_dup_packet(&mkv->cur_audio_pkt);
1361 ret = mkv_write_packet_internal(s, pkt);
1365 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1367 MatroskaMuxContext *mkv = s->priv_data;
1369 if (s->pb->seekable)
1374 if (mkv->cluster_pos) {
1375 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1376 " bytes\n", avio_tell(pb));
1377 end_ebml_master(pb, mkv->cluster);
1378 mkv->cluster_pos = 0;
1380 mkv_flush_dynbuf(s);
1385 return mkv_write_packet(s, pkt);
1388 static int mkv_write_trailer(AVFormatContext *s)
1390 MatroskaMuxContext *mkv = s->priv_data;
1391 AVIOContext *pb = s->pb;
1392 int64_t currentpos, cuespos;
1395 // check if we have an audio packet cached
1396 if (mkv->cur_audio_pkt.size > 0) {
1397 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1398 av_free_packet(&mkv->cur_audio_pkt);
1400 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1406 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1407 mkv_flush_dynbuf(s);
1408 } else if (mkv->cluster_pos) {
1409 end_ebml_master(pb, mkv->cluster);
1412 if (mkv->mode != MODE_WEBM) {
1413 ret = mkv_write_chapters(s);
1414 if (ret < 0) return ret;
1418 if (mkv->cues->num_entries) {
1419 if (mkv->reserve_cues_space) {
1422 currentpos = avio_tell(pb);
1423 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1425 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1426 cues_end = avio_tell(pb);
1427 if (cues_end > cuespos + mkv->reserve_cues_space) {
1428 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1429 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1430 cues_end - cuespos);
1431 return AVERROR(EINVAL);
1434 if (cues_end < cuespos + mkv->reserve_cues_space)
1435 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1437 avio_seek(pb, currentpos, SEEK_SET);
1439 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1442 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1443 if (ret < 0) return ret;
1446 mkv_write_seekhead(pb, mkv->main_seekhead);
1448 // update the duration
1449 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1450 currentpos = avio_tell(pb);
1451 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1452 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1454 avio_seek(pb, currentpos, SEEK_SET);
1457 end_ebml_master(pb, mkv->segment);
1458 av_free(mkv->tracks);
1459 av_freep(&mkv->cues->entries);
1460 av_freep(&mkv->cues);
1465 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1468 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1469 if (ff_mkv_codec_tags[i].id == codec_id)
1472 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1473 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1474 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1481 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1482 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1483 static const AVOption options[] = {
1484 { "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 },
1485 { "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 },
1486 { "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 },
1490 #if CONFIG_MATROSKA_MUXER
1491 static const AVClass matroska_class = {
1492 .class_name = "matroska muxer",
1493 .item_name = av_default_item_name,
1495 .version = LIBAVUTIL_VERSION_INT,
1498 AVOutputFormat ff_matroska_muxer = {
1500 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1501 .mime_type = "video/x-matroska",
1502 .extensions = "mkv",
1503 .priv_data_size = sizeof(MatroskaMuxContext),
1504 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1505 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1506 .video_codec = CONFIG_LIBX264_ENCODER ?
1507 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1508 .write_header = mkv_write_header,
1509 .write_packet = mkv_write_flush_packet,
1510 .write_trailer = mkv_write_trailer,
1511 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1512 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1513 .codec_tag = (const AVCodecTag* const []){
1514 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1516 .subtitle_codec = AV_CODEC_ID_SSA,
1517 .query_codec = mkv_query_codec,
1518 .priv_class = &matroska_class,
1522 #if CONFIG_WEBM_MUXER
1523 static const AVClass webm_class = {
1524 .class_name = "webm muxer",
1525 .item_name = av_default_item_name,
1527 .version = LIBAVUTIL_VERSION_INT,
1530 AVOutputFormat ff_webm_muxer = {
1532 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1533 .mime_type = "video/webm",
1534 .extensions = "webm",
1535 .priv_data_size = sizeof(MatroskaMuxContext),
1536 .audio_codec = AV_CODEC_ID_VORBIS,
1537 .video_codec = AV_CODEC_ID_VP8,
1538 .write_header = mkv_write_header,
1539 .write_packet = mkv_write_flush_packet,
1540 .write_trailer = mkv_write_trailer,
1541 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1542 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1543 .priv_class = &webm_class,
1547 #if CONFIG_MATROSKA_AUDIO_MUXER
1548 static const AVClass mka_class = {
1549 .class_name = "matroska audio muxer",
1550 .item_name = av_default_item_name,
1552 .version = LIBAVUTIL_VERSION_INT,
1554 AVOutputFormat ff_matroska_audio_muxer = {
1556 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1557 .mime_type = "audio/x-matroska",
1558 .extensions = "mka",
1559 .priv_data_size = sizeof(MatroskaMuxContext),
1560 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1561 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1562 .video_codec = AV_CODEC_ID_NONE,
1563 .write_header = mkv_write_header,
1564 .write_packet = mkv_write_flush_packet,
1565 .write_trailer = mkv_write_trailer,
1566 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1568 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1569 .priv_class = &mka_class,