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"
33 #include "vorbiscomment.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/channel_layout.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lfg.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/random_seed.h"
45 #include "libavutil/samplefmt.h"
47 #include "libavcodec/xiph.h"
48 #include "libavcodec/mpeg4audio.h"
50 typedef struct ebml_master {
51 int64_t pos; ///< absolute offset in the file where the master's elements start
52 int sizebytes; ///< how many bytes were reserved for the size
55 typedef struct mkv_seekhead_entry {
56 unsigned int elementid;
60 typedef struct mkv_seekhead {
62 int64_t segment_offset; ///< the file offset to the beginning of the segment
63 int reserved_size; ///< -1 if appending to file
65 mkv_seekhead_entry *entries;
72 int64_t cluster_pos; ///< file offset of the cluster containing the block
76 int64_t segment_offset;
77 mkv_cuepoint *entries;
86 #define MODE_MATROSKAv2 0x01
87 #define MODE_WEBM 0x02
89 typedef struct MatroskaMuxContext {
94 int64_t segment_offset;
96 int64_t cluster_pos; ///< file offset of the current cluster
98 int64_t duration_offset;
100 mkv_seekhead *main_seekhead;
104 AVPacket cur_audio_pkt;
106 int have_attachments;
108 int reserve_cues_space;
109 int cluster_size_limit;
111 int64_t cluster_time_limit;
113 } MatroskaMuxContext;
116 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
117 * offset, 4 bytes for target EBML ID */
118 #define MAX_SEEKENTRY_SIZE 21
120 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
122 #define MAX_CUETRACKPOS_SIZE 22
124 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
125 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
128 static int ebml_id_size(unsigned int id)
130 return (av_log2(id+1)-1)/7+1;
133 static void put_ebml_id(AVIOContext *pb, unsigned int id)
135 int i = ebml_id_size(id);
137 avio_w8(pb, id >> (i*8));
141 * Write an EBML size meaning "unknown size".
143 * @param bytes The number of bytes the size should occupy (maximum: 8).
145 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
148 avio_w8(pb, 0x1ff >> bytes);
154 * Calculate how many bytes are needed to represent a given number in EBML.
156 static int ebml_num_size(uint64_t num)
159 while ((num+1) >> bytes*7) bytes++;
164 * Write a number in EBML variable length format.
166 * @param bytes The number of bytes that need to be used to write the number.
167 * If zero, any number of bytes can be used.
169 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
171 int i, needed_bytes = ebml_num_size(num);
173 // sizes larger than this are currently undefined in EBML
174 assert(num < (1ULL<<56)-1);
177 // don't care how many bytes are used, so use the min
178 bytes = needed_bytes;
179 // the bytes needed to write the given size would exceed the bytes
180 // that we need to use, so write unknown size. This shouldn't happen.
181 assert(bytes >= needed_bytes);
183 num |= 1ULL << bytes*7;
184 for (i = bytes - 1; i >= 0; i--)
185 avio_w8(pb, num >> i*8);
188 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
192 while (tmp>>=8) bytes++;
194 put_ebml_id(pb, elementid);
195 put_ebml_num(pb, bytes, 0);
196 for (i = bytes - 1; i >= 0; i--)
197 avio_w8(pb, val >> i*8);
200 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
202 put_ebml_id(pb, elementid);
203 put_ebml_num(pb, 8, 0);
204 avio_wb64(pb, av_double2int(val));
207 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
208 const void *buf, int size)
210 put_ebml_id(pb, elementid);
211 put_ebml_num(pb, size, 0);
212 avio_write(pb, buf, size);
215 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
217 put_ebml_binary(pb, elementid, str, strlen(str));
221 * Write a void element of a given size. Useful for reserving space in
222 * the file to be written to later.
224 * @param size The number of bytes to reserve, which must be at least 2.
226 static void put_ebml_void(AVIOContext *pb, uint64_t size)
228 int64_t currentpos = avio_tell(pb);
232 put_ebml_id(pb, EBML_ID_VOID);
233 // we need to subtract the length needed to store the size from the
234 // size we need to reserve so 2 cases, we use 8 bytes to store the
235 // size if possible, 1 byte otherwise
237 put_ebml_num(pb, size-1, 0);
239 put_ebml_num(pb, size-9, 8);
240 while(avio_tell(pb) < currentpos + size)
244 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
246 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
247 put_ebml_id(pb, elementid);
248 put_ebml_size_unknown(pb, bytes);
249 return (ebml_master){ avio_tell(pb), bytes };
252 static void end_ebml_master(AVIOContext *pb, ebml_master master)
254 int64_t pos = avio_tell(pb);
256 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
258 put_ebml_num(pb, pos - master.pos, master.sizebytes);
259 avio_seek(pb, pos, SEEK_SET);
262 static void put_xiph_size(AVIOContext *pb, int size)
265 for (i = 0; i < size / 255; i++)
267 avio_w8(pb, size % 255);
271 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
272 * elements. If a maximum number of elements is specified, enough space
273 * will be reserved at the current file location to write a seek head of
276 * @param segment_offset The absolute offset to the position in the file
277 * where the segment begins.
278 * @param numelements The maximum number of elements that will be indexed
279 * by this seek head, 0 if unlimited.
281 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
283 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
284 if (new_seekhead == NULL)
287 new_seekhead->segment_offset = segment_offset;
289 if (numelements > 0) {
290 new_seekhead->filepos = avio_tell(pb);
291 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
292 // and size, and 3 bytes to guarantee that an EBML void element
293 // will fit afterwards
294 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
295 new_seekhead->max_entries = numelements;
296 put_ebml_void(pb, new_seekhead->reserved_size);
301 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
305 // don't store more elements than we reserved space for
306 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
309 if ((err = av_reallocp_array(&seekhead->entries, seekhead->num_entries + 1,
310 sizeof(*seekhead->entries))) < 0) {
311 seekhead->num_entries = 0;
315 seekhead->entries[seekhead->num_entries].elementid = elementid;
316 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
322 * Write the seek head to the file and free it. If a maximum number of
323 * elements was specified to mkv_start_seekhead(), the seek head will
324 * be written at the location reserved for it. Otherwise, it is written
325 * at the current location in the file.
327 * @return The file offset where the seekhead was written,
328 * -1 if an error occurred.
330 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
332 ebml_master metaseek, seekentry;
336 currentpos = avio_tell(pb);
338 if (seekhead->reserved_size > 0) {
339 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
345 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
346 for (i = 0; i < seekhead->num_entries; i++) {
347 mkv_seekhead_entry *entry = &seekhead->entries[i];
349 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
351 put_ebml_id(pb, MATROSKA_ID_SEEKID);
352 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
353 put_ebml_id(pb, entry->elementid);
355 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
356 end_ebml_master(pb, seekentry);
358 end_ebml_master(pb, metaseek);
360 if (seekhead->reserved_size > 0) {
361 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
362 put_ebml_void(pb, remaining);
363 avio_seek(pb, currentpos, SEEK_SET);
365 currentpos = seekhead->filepos;
368 av_free(seekhead->entries);
374 static mkv_cues * mkv_start_cues(int64_t segment_offset)
376 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
380 cues->segment_offset = segment_offset;
384 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
391 if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
392 sizeof(*cues->entries))) < 0) {
393 cues->num_entries = 0;
397 cues->entries[cues->num_entries].pts = ts;
398 cues->entries[cues->num_entries].tracknum = stream + 1;
399 cues->entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
404 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
406 ebml_master cues_element;
410 currentpos = avio_tell(pb);
411 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
413 for (i = 0; i < cues->num_entries; i++) {
414 ebml_master cuepoint, track_positions;
415 mkv_cuepoint *entry = &cues->entries[i];
416 uint64_t pts = entry->pts;
418 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
419 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
421 // put all the entries from different tracks that have the exact same
422 // timestamp into the same CuePoint
423 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
424 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
425 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
426 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
427 end_ebml_master(pb, track_positions);
430 end_ebml_master(pb, cuepoint);
432 end_ebml_master(pb, cues_element);
437 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
439 uint8_t *header_start[3];
441 int first_header_size;
444 if (codec->codec_id == AV_CODEC_ID_VORBIS)
445 first_header_size = 30;
447 first_header_size = 42;
449 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
450 first_header_size, header_start, header_len) < 0) {
451 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
455 avio_w8(pb, 2); // number packets - 1
456 for (j = 0; j < 2; j++) {
457 put_xiph_size(pb, header_len[j]);
459 for (j = 0; j < 3; j++)
460 avio_write(pb, header_start[j], header_len[j]);
465 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
467 if (codec->extradata && codec->extradata_size == 2)
468 avio_write(pb, codec->extradata, 2);
470 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
474 static int put_flac_codecpriv(AVFormatContext *s,
475 AVIOContext *pb, AVCodecContext *codec)
477 int write_comment = (codec->channel_layout &&
478 !(codec->channel_layout & ~0x3ffffULL) &&
479 !ff_flac_is_native_layout(codec->channel_layout));
480 int ret = ff_flac_write_header(pb, codec, !write_comment);
486 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
487 "Libav" : LIBAVFORMAT_IDENT;
488 AVDictionary *dict = NULL;
489 uint8_t buf[32], *data, *p;
492 snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
493 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
495 len = ff_vorbiscomment_length(dict, vendor);
496 data = av_malloc(len + 4);
499 return AVERROR(ENOMEM);
503 AV_WB24(data + 1, len);
506 ff_vorbiscomment_write(&p, &dict, vendor);
508 avio_write(pb, data, len + 4);
517 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
519 MPEG4AudioConfig mp4ac;
521 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
522 codec->extradata_size * 8, 1) < 0) {
523 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
527 *sample_rate = mp4ac.sample_rate;
528 *output_sample_rate = mp4ac.ext_sample_rate;
531 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
535 int ret, codecpriv_size;
537 ret = avio_open_dyn_buf(&dyn_cp);
542 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
543 ret = put_xiph_codecpriv(s, dyn_cp, codec);
544 else if (codec->codec_id == AV_CODEC_ID_FLAC)
545 ret = put_flac_codecpriv(s, dyn_cp, codec);
546 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
547 ret = put_wv_codecpriv(dyn_cp, codec);
548 else if (codec->codec_id == AV_CODEC_ID_H264)
549 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
550 else if (codec->codec_id == AV_CODEC_ID_HEVC)
551 ret = ff_isom_write_hvcc(dyn_cp, codec->extradata, codec->extradata_size, 0);
552 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
553 if (codec->extradata_size < 36) {
554 av_log(s, AV_LOG_ERROR,
555 "Invalid extradata found, ALAC expects a 36-byte "
557 ret = AVERROR_INVALIDDATA;
559 avio_write(dyn_cp, codec->extradata + 12,
560 codec->extradata_size - 12);
562 else if (codec->extradata_size)
563 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
564 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
566 if (!codec->codec_tag)
567 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
568 if (codec->extradata_size)
569 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
571 if (!codec->codec_tag)
572 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
573 if (!codec->codec_tag) {
574 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
578 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
581 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
583 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
585 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
588 if (!codec->codec_tag)
589 codec->codec_tag = tag;
591 ff_put_wav_header(dyn_cp, codec);
594 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
596 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
601 static int mkv_write_tracks(AVFormatContext *s)
603 MatroskaMuxContext *mkv = s->priv_data;
604 AVIOContext *pb = s->pb;
608 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
609 if (ret < 0) return ret;
611 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
612 for (i = 0; i < s->nb_streams; i++) {
613 AVStream *st = s->streams[i];
614 AVCodecContext *codec = st->codec;
615 ebml_master subinfo, track;
618 int bit_depth = av_get_bits_per_sample(codec->codec_id);
619 int sample_rate = codec->sample_rate;
620 int output_sample_rate = 0;
621 AVDictionaryEntry *tag;
623 // ms precision is the de-facto standard timescale for mkv files
624 avpriv_set_pts_info(st, 64, 1, 1000);
626 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
627 mkv->have_attachments = 1;
632 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
634 if (codec->codec_id == AV_CODEC_ID_AAC)
635 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
637 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
638 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
639 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
640 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
642 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
643 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
644 tag = av_dict_get(st->metadata, "language", NULL, 0);
645 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
647 // The default value for TRACKFLAGDEFAULT is 1, so add element
648 // if we need to clear it.
649 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
650 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
652 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->delay) {
653 mkv->tracks[i].ts_offset = av_rescale_q(codec->delay,
654 (AVRational){ 1, codec->sample_rate },
657 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
658 av_rescale_q(codec->delay, (AVRational){ 1, codec->sample_rate },
659 (AVRational){ 1, 1000000000 }));
662 // look for a codec ID string specific to mkv to use,
663 // if none are found, use AVI codes
664 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
665 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
666 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
672 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
673 codec->codec_id == AV_CODEC_ID_VP9 ||
674 codec->codec_id == AV_CODEC_ID_OPUS ||
675 codec->codec_id == AV_CODEC_ID_VORBIS)) {
676 av_log(s, AV_LOG_ERROR,
677 "Only VP8 or VP9 video and Vorbis or Opus audio are supported for WebM.\n");
678 return AVERROR(EINVAL);
681 switch (codec->codec_type) {
682 case AVMEDIA_TYPE_VIDEO:
683 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
684 if (st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0)
685 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9 / av_q2d(st->avg_frame_rate));
688 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
689 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
690 || codec->codec_id == AV_CODEC_ID_SVQ1
691 || codec->codec_id == AV_CODEC_ID_SVQ3
692 || codec->codec_id == AV_CODEC_ID_CINEPAK))
696 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
697 else if (!native_id) {
698 // if there is no mkv-specific codec ID, use VFW mode
699 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
700 mkv->tracks[i].write_dts = 1;
703 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
704 // XXX: interlace flag?
705 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
706 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
707 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
708 uint8_t stereo_fmt = atoi(tag->value);
713 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM
714 || stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
717 case MODE_MATROSKAv2:
718 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
724 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
726 if (st->sample_aspect_ratio.num) {
727 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
728 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
729 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
730 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
732 end_ebml_master(pb, subinfo);
735 case AVMEDIA_TYPE_AUDIO:
736 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
739 // no mkv-specific ID, use ACM mode
740 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
742 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
743 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
744 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
745 if (output_sample_rate)
746 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
748 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
749 end_ebml_master(pb, subinfo);
752 case AVMEDIA_TYPE_SUBTITLE:
753 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
755 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
756 return AVERROR(ENOSYS);
760 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
763 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
764 if (ret < 0) return ret;
766 end_ebml_master(pb, track);
768 end_ebml_master(pb, tracks);
772 static int mkv_write_chapters(AVFormatContext *s)
774 MatroskaMuxContext *mkv = s->priv_data;
775 AVIOContext *pb = s->pb;
776 ebml_master chapters, editionentry;
777 AVRational scale = {1, 1E9};
780 if (!s->nb_chapters || mkv->wrote_chapters)
783 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
784 if (ret < 0) return ret;
786 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
787 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
788 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
789 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
790 for (i = 0; i < s->nb_chapters; i++) {
791 ebml_master chapteratom, chapterdisplay;
792 AVChapter *c = s->chapters[i];
793 AVDictionaryEntry *t = NULL;
795 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
796 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
797 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
798 av_rescale_q(c->start, c->time_base, scale));
799 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
800 av_rescale_q(c->end, c->time_base, scale));
801 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
802 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
803 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
804 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
805 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
806 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
807 end_ebml_master(pb, chapterdisplay);
809 end_ebml_master(pb, chapteratom);
811 end_ebml_master(pb, editionentry);
812 end_ebml_master(pb, chapters);
814 mkv->wrote_chapters = 1;
818 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
820 uint8_t *key = av_strdup(t->key);
822 const uint8_t *lang = NULL;
825 if ((p = strrchr(p, '-')) &&
826 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
833 else if (*p >= 'a' && *p <= 'z')
838 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
839 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
841 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
842 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
843 end_ebml_master(pb, tag);
848 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
849 unsigned int uid, ebml_master *tags)
851 MatroskaMuxContext *mkv = s->priv_data;
852 ebml_master tag, targets;
853 AVDictionaryEntry *t = NULL;
857 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
858 if (ret < 0) return ret;
860 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
863 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
864 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
866 put_ebml_uint(s->pb, elementid, uid);
867 end_ebml_master(s->pb, targets);
869 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
870 if (av_strcasecmp(t->key, "title") &&
871 av_strcasecmp(t->key, "encoding_tool"))
872 mkv_write_simpletag(s->pb, t);
874 end_ebml_master(s->pb, tag);
878 static int mkv_write_tags(AVFormatContext *s)
880 ebml_master tags = {0};
883 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
885 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
886 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
887 if (ret < 0) return ret;
890 for (i = 0; i < s->nb_streams; i++) {
891 AVStream *st = s->streams[i];
893 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
896 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
897 if (ret < 0) return ret;
900 for (i = 0; i < s->nb_chapters; i++) {
901 AVChapter *ch = s->chapters[i];
903 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
906 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
907 if (ret < 0) return ret;
911 end_ebml_master(s->pb, tags);
915 static int mkv_write_attachments(AVFormatContext *s)
917 MatroskaMuxContext *mkv = s->priv_data;
918 AVIOContext *pb = s->pb;
919 ebml_master attachments;
923 if (!mkv->have_attachments)
926 av_lfg_init(&c, av_get_random_seed());
928 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
929 if (ret < 0) return ret;
931 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
933 for (i = 0; i < s->nb_streams; i++) {
934 AVStream *st = s->streams[i];
935 ebml_master attached_file;
936 AVDictionaryEntry *t;
937 const char *mimetype = NULL;
939 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
942 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
944 if (t = av_dict_get(st->metadata, "title", NULL, 0))
945 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
946 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
947 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
948 return AVERROR(EINVAL);
950 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
951 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
953 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
955 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
956 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
957 mimetype = ff_mkv_mime_tags[i].str;
962 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
963 "it cannot be deduced from the codec id.\n", i);
964 return AVERROR(EINVAL);
967 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
968 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
969 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
970 end_ebml_master(pb, attached_file);
972 end_ebml_master(pb, attachments);
977 static int mkv_write_header(AVFormatContext *s)
979 MatroskaMuxContext *mkv = s->priv_data;
980 AVIOContext *pb = s->pb;
981 ebml_master ebml_header, segment_info;
982 AVDictionaryEntry *tag;
985 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
986 else mkv->mode = MODE_MATROSKAv2;
988 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
990 return AVERROR(ENOMEM);
992 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
993 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
994 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
995 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
996 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
997 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
998 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
999 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1000 end_ebml_master(pb, ebml_header);
1002 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1003 mkv->segment_offset = avio_tell(pb);
1005 // we write 2 seek heads - one at the end of the file to point to each
1006 // cluster, and one at the beginning to point to all other level one
1007 // elements (including the seek head at the end of the file), which
1008 // isn't more than 10 elements if we only write one of each other
1009 // currently defined level 1 element
1010 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1011 if (!mkv->main_seekhead)
1012 return AVERROR(ENOMEM);
1014 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1015 if (ret < 0) return ret;
1017 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1018 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1019 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1020 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1021 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1022 uint32_t segment_uid[4];
1025 av_lfg_init(&lfg, av_get_random_seed());
1027 for (i = 0; i < 4; i++)
1028 segment_uid[i] = av_lfg_get(&lfg);
1030 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1031 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1032 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1034 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1035 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1038 // reserve space for the duration
1040 mkv->duration_offset = avio_tell(pb);
1041 put_ebml_void(pb, 11); // assumes double-precision float to be written
1042 end_ebml_master(pb, segment_info);
1044 ret = mkv_write_tracks(s);
1045 if (ret < 0) return ret;
1047 if (mkv->mode != MODE_WEBM) {
1048 ret = mkv_write_chapters(s);
1049 if (ret < 0) return ret;
1051 ret = mkv_write_tags(s);
1052 if (ret < 0) return ret;
1054 ret = mkv_write_attachments(s);
1055 if (ret < 0) return ret;
1058 if (!s->pb->seekable)
1059 mkv_write_seekhead(pb, mkv->main_seekhead);
1061 mkv->cues = mkv_start_cues(mkv->segment_offset);
1062 if (mkv->cues == NULL)
1063 return AVERROR(ENOMEM);
1065 if (pb->seekable && mkv->reserve_cues_space) {
1066 mkv->cues_pos = avio_tell(pb);
1067 put_ebml_void(pb, mkv->reserve_cues_space);
1070 av_init_packet(&mkv->cur_audio_pkt);
1071 mkv->cur_audio_pkt.size = 0;
1075 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1076 // after 4k and on a keyframe
1078 if (mkv->cluster_time_limit < 0)
1079 mkv->cluster_time_limit = 5000;
1080 if (mkv->cluster_size_limit < 0)
1081 mkv->cluster_size_limit = 5 * 1024 * 1024;
1083 if (mkv->cluster_time_limit < 0)
1084 mkv->cluster_time_limit = 1000;
1085 if (mkv->cluster_size_limit < 0)
1086 mkv->cluster_size_limit = 32 * 1024;
1092 static int mkv_blockgroup_size(int pkt_size)
1094 int size = pkt_size + 4;
1095 size += ebml_num_size(size);
1096 size += 2; // EBML ID for block and block duration
1097 size += 8; // max size of block duration
1098 size += ebml_num_size(size);
1099 size += 1; // blockgroup EBML ID
1103 static int ass_get_duration(const uint8_t *p)
1105 int sh, sm, ss, sc, eh, em, es, ec;
1106 uint64_t start, end;
1108 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1109 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1111 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1112 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1116 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1118 MatroskaMuxContext *mkv = s->priv_data;
1119 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1120 uint8_t *start, *end, *data = pkt->data;
1121 ebml_master blockgroup;
1125 int duration = ass_get_duration(data);
1126 max_duration = FFMAX(duration, max_duration);
1127 end = memchr(data, '\n', data_size);
1128 size = line_size = end ? end-data+1 : data_size;
1129 size -= end ? (end[-1]=='\r')+1 : 0;
1131 for (i=0; i<3; i++, start++)
1132 if (!(start = memchr(start, ',', size-(start-data))))
1133 return max_duration;
1134 size -= start - data;
1135 sscanf(data, "Dialogue: %d,", &layer);
1136 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1137 s->streams[pkt->stream_index]->nb_frames, layer);
1138 size = FFMIN(i+size, sizeof(buffer));
1139 memcpy(buffer+i, start, size-i);
1141 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1142 "pts %" PRId64 ", duration %d\n",
1143 avio_tell(pb), size, pkt->pts, duration);
1144 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1145 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1146 put_ebml_num(pb, size+4, 0);
1147 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1148 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1150 avio_write(pb, buffer, size);
1151 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1152 end_ebml_master(pb, blockgroup);
1155 data_size -= line_size;
1158 return max_duration;
1161 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1168 dst = av_malloc(srclen);
1170 return AVERROR(ENOMEM);
1172 while (srclen >= WV_HEADER_SIZE) {
1175 ret = ff_wv_parse_header(&header, src);
1178 src += WV_HEADER_SIZE;
1179 srclen -= WV_HEADER_SIZE;
1181 if (srclen < header.blocksize) {
1182 ret = AVERROR_INVALIDDATA;
1186 if (header.initial) {
1187 AV_WL32(dst + offset, header.samples);
1190 AV_WL32(dst + offset, header.flags);
1191 AV_WL32(dst + offset + 4, header.crc);
1194 if (!(header.initial && header.final)) {
1195 AV_WL32(dst + offset, header.blocksize);
1199 memcpy(dst + offset, src, header.blocksize);
1200 src += header.blocksize;
1201 srclen -= header.blocksize;
1202 offset += header.blocksize;
1214 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1215 unsigned int blockid, AVPacket *pkt, int flags)
1217 MatroskaMuxContext *mkv = s->priv_data;
1218 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1219 uint8_t *data = NULL;
1220 int offset = 0, size = pkt->size;
1221 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1223 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1224 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1225 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1226 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1227 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1228 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1229 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1230 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1231 /* extradata is Annex B, assume the bitstream is too and convert it */
1232 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1233 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1234 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1236 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1242 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1243 /* Matroska specification requires to remove the first QuickTime atom
1249 put_ebml_id(pb, blockid);
1250 put_ebml_num(pb, size+4, 0);
1251 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1252 avio_wb16(pb, ts - mkv->cluster_pts);
1254 avio_write(pb, data + offset, size);
1255 if (data != pkt->data)
1259 static int srt_get_duration(uint8_t **buf)
1261 int i, duration = 0;
1263 for (i=0; i<2 && !duration; i++) {
1264 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1265 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1266 &s_hour, &s_min, &s_sec, &s_hsec,
1267 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1268 s_min += 60*s_hour; e_min += 60*e_hour;
1269 s_sec += 60*s_min; e_sec += 60*e_min;
1270 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1271 duration = e_hsec - s_hsec;
1273 *buf += strcspn(*buf, "\n") + 1;
1278 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1280 ebml_master blockgroup;
1281 AVPacket pkt2 = *pkt;
1282 int64_t duration = srt_get_duration(&pkt2.data);
1283 pkt2.size -= pkt2.data - pkt->data;
1285 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1286 mkv_blockgroup_size(pkt2.size));
1287 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1288 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1289 end_ebml_master(pb, blockgroup);
1294 static void mkv_flush_dynbuf(AVFormatContext *s)
1296 MatroskaMuxContext *mkv = s->priv_data;
1303 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1304 avio_write(s->pb, dyn_buf, bufsize);
1309 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1311 MatroskaMuxContext *mkv = s->priv_data;
1312 AVIOContext *pb = s->pb;
1313 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1314 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1315 int duration = pkt->duration;
1317 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1319 if (ts == AV_NOPTS_VALUE) {
1320 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1321 return AVERROR(EINVAL);
1323 ts += mkv->tracks[pkt->stream_index].ts_offset;
1325 if (!s->pb->seekable) {
1327 avio_open_dyn_buf(&mkv->dyn_bc);
1331 if (!mkv->cluster_pos) {
1332 mkv->cluster_pos = avio_tell(s->pb);
1333 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1334 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1335 mkv->cluster_pts = FFMAX(0, ts);
1338 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1339 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1340 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1341 duration = mkv_write_ass_blocks(s, pb, pkt);
1342 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1343 duration = mkv_write_srt_blocks(s, pb, pkt);
1345 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1346 duration = pkt->convergence_duration;
1347 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1348 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1349 end_ebml_master(pb, blockgroup);
1352 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1353 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1354 if (ret < 0) return ret;
1357 mkv->duration = FFMAX(mkv->duration, ts + duration);
1361 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1363 MatroskaMuxContext *mkv = s->priv_data;
1364 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1365 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1367 int64_t cluster_time;
1371 if (mkv->tracks[pkt->stream_index].write_dts)
1372 cluster_time = pkt->dts - mkv->cluster_pts;
1374 cluster_time = pkt->pts - mkv->cluster_pts;
1375 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1377 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1378 // after 4k and on a keyframe
1379 if (s->pb->seekable) {
1381 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1384 cluster_size = avio_tell(pb);
1387 if (mkv->cluster_pos &&
1388 (cluster_size > mkv->cluster_size_limit ||
1389 cluster_time > mkv->cluster_time_limit ||
1390 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1391 cluster_size > 4 * 1024))) {
1392 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1393 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1394 avio_tell(pb), pkt->pts, pkt->dts);
1395 end_ebml_master(pb, mkv->cluster);
1396 mkv->cluster_pos = 0;
1398 mkv_flush_dynbuf(s);
1402 // check if we have an audio packet cached
1403 if (mkv->cur_audio_pkt.size > 0) {
1404 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1405 av_free_packet(&mkv->cur_audio_pkt);
1407 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1412 // buffer an audio packet to ensure the packet containing the video
1413 // keyframe's timecode is contained in the same cluster for WebM
1414 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1415 mkv->cur_audio_pkt = *pkt;
1417 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1418 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1420 ret = av_dup_packet(&mkv->cur_audio_pkt);
1422 ret = mkv_write_packet_internal(s, pkt);
1426 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1428 MatroskaMuxContext *mkv = s->priv_data;
1430 if (s->pb->seekable)
1435 if (mkv->cluster_pos) {
1436 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1437 " bytes\n", avio_tell(pb));
1438 end_ebml_master(pb, mkv->cluster);
1439 mkv->cluster_pos = 0;
1441 mkv_flush_dynbuf(s);
1446 return mkv_write_packet(s, pkt);
1449 static int mkv_write_trailer(AVFormatContext *s)
1451 MatroskaMuxContext *mkv = s->priv_data;
1452 AVIOContext *pb = s->pb;
1453 int64_t currentpos, cuespos;
1456 // check if we have an audio packet cached
1457 if (mkv->cur_audio_pkt.size > 0) {
1458 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1459 av_free_packet(&mkv->cur_audio_pkt);
1461 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1467 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1468 mkv_flush_dynbuf(s);
1469 } else if (mkv->cluster_pos) {
1470 end_ebml_master(pb, mkv->cluster);
1473 if (mkv->mode != MODE_WEBM) {
1474 ret = mkv_write_chapters(s);
1475 if (ret < 0) return ret;
1479 if (mkv->cues->num_entries) {
1480 if (mkv->reserve_cues_space) {
1483 currentpos = avio_tell(pb);
1484 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1486 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1487 cues_end = avio_tell(pb);
1488 if (cues_end > cuespos + mkv->reserve_cues_space) {
1489 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1490 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1491 cues_end - cuespos);
1492 return AVERROR(EINVAL);
1495 if (cues_end < cuespos + mkv->reserve_cues_space)
1496 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1498 avio_seek(pb, currentpos, SEEK_SET);
1500 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1503 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1504 if (ret < 0) return ret;
1507 mkv_write_seekhead(pb, mkv->main_seekhead);
1509 // update the duration
1510 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1511 currentpos = avio_tell(pb);
1512 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1513 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1515 avio_seek(pb, currentpos, SEEK_SET);
1518 end_ebml_master(pb, mkv->segment);
1519 av_free(mkv->tracks);
1520 av_freep(&mkv->cues->entries);
1521 av_freep(&mkv->cues);
1526 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1529 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1530 if (ff_mkv_codec_tags[i].id == codec_id)
1533 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1534 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1535 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1542 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1543 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1544 static const AVOption options[] = {
1545 { "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 },
1546 { "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 },
1547 { "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 },
1551 #if CONFIG_MATROSKA_MUXER
1552 static const AVClass matroska_class = {
1553 .class_name = "matroska muxer",
1554 .item_name = av_default_item_name,
1556 .version = LIBAVUTIL_VERSION_INT,
1559 AVOutputFormat ff_matroska_muxer = {
1561 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1562 .mime_type = "video/x-matroska",
1563 .extensions = "mkv",
1564 .priv_data_size = sizeof(MatroskaMuxContext),
1565 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1566 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1567 .video_codec = CONFIG_LIBX264_ENCODER ?
1568 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1569 .write_header = mkv_write_header,
1570 .write_packet = mkv_write_flush_packet,
1571 .write_trailer = mkv_write_trailer,
1572 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1573 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1574 .codec_tag = (const AVCodecTag* const []){
1575 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1577 .subtitle_codec = AV_CODEC_ID_SSA,
1578 .query_codec = mkv_query_codec,
1579 .priv_class = &matroska_class,
1583 #if CONFIG_WEBM_MUXER
1584 static const AVClass webm_class = {
1585 .class_name = "webm muxer",
1586 .item_name = av_default_item_name,
1588 .version = LIBAVUTIL_VERSION_INT,
1591 AVOutputFormat ff_webm_muxer = {
1593 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1594 .mime_type = "video/webm",
1595 .extensions = "webm",
1596 .priv_data_size = sizeof(MatroskaMuxContext),
1597 .audio_codec = AV_CODEC_ID_VORBIS,
1598 .video_codec = AV_CODEC_ID_VP8,
1599 .write_header = mkv_write_header,
1600 .write_packet = mkv_write_flush_packet,
1601 .write_trailer = mkv_write_trailer,
1602 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1603 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1604 .priv_class = &webm_class,
1608 #if CONFIG_MATROSKA_AUDIO_MUXER
1609 static const AVClass mka_class = {
1610 .class_name = "matroska audio muxer",
1611 .item_name = av_default_item_name,
1613 .version = LIBAVUTIL_VERSION_INT,
1615 AVOutputFormat ff_matroska_audio_muxer = {
1617 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1618 .mime_type = "audio/x-matroska",
1619 .extensions = "mka",
1620 .priv_data_size = sizeof(MatroskaMuxContext),
1621 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1622 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1623 .video_codec = AV_CODEC_ID_NONE,
1624 .write_header = mkv_write_header,
1625 .write_packet = mkv_write_flush_packet,
1626 .write_trailer = mkv_write_trailer,
1627 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1629 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1630 .priv_class = &mka_class,