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 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
624 mkv->have_attachments = 1;
629 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
631 if (codec->codec_id == AV_CODEC_ID_AAC)
632 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
634 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
635 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
636 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
637 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
639 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
640 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
641 tag = av_dict_get(st->metadata, "language", NULL, 0);
642 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
644 // The default value for TRACKFLAGDEFAULT is 1, so add element
645 // if we need to clear it.
646 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
647 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
649 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->delay) {
650 mkv->tracks[i].ts_offset = av_rescale_q(codec->delay,
651 (AVRational){ 1, codec->sample_rate },
654 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
655 av_rescale_q(codec->delay, (AVRational){ 1, codec->sample_rate },
656 (AVRational){ 1, 1000000000 }));
659 // look for a codec ID string specific to mkv to use,
660 // if none are found, use AVI codes
661 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
662 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
663 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
669 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
670 codec->codec_id == AV_CODEC_ID_VORBIS)) {
671 av_log(s, AV_LOG_ERROR,
672 "Only VP8 video and Vorbis audio are supported for WebM.\n");
673 return AVERROR(EINVAL);
676 switch (codec->codec_type) {
677 case AVMEDIA_TYPE_VIDEO:
678 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
679 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
682 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
683 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
684 || codec->codec_id == AV_CODEC_ID_SVQ1
685 || codec->codec_id == AV_CODEC_ID_SVQ3
686 || codec->codec_id == AV_CODEC_ID_CINEPAK))
690 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
691 else if (!native_id) {
692 // if there is no mkv-specific codec ID, use VFW mode
693 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
694 mkv->tracks[i].write_dts = 1;
697 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
698 // XXX: interlace flag?
699 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
700 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
701 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
702 uint8_t stereo_fmt = atoi(tag->value);
707 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM
708 || stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
711 case MODE_MATROSKAv2:
712 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
718 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
720 if (st->sample_aspect_ratio.num) {
721 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
722 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
723 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
724 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
726 end_ebml_master(pb, subinfo);
729 case AVMEDIA_TYPE_AUDIO:
730 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
733 // no mkv-specific ID, use ACM mode
734 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
736 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
737 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
738 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
739 if (output_sample_rate)
740 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
742 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
743 end_ebml_master(pb, subinfo);
746 case AVMEDIA_TYPE_SUBTITLE:
747 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
749 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
750 return AVERROR(ENOSYS);
754 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
757 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
758 if (ret < 0) return ret;
760 end_ebml_master(pb, track);
762 // ms precision is the de-facto standard timescale for mkv files
763 avpriv_set_pts_info(st, 64, 1, 1000);
765 end_ebml_master(pb, tracks);
769 static int mkv_write_chapters(AVFormatContext *s)
771 MatroskaMuxContext *mkv = s->priv_data;
772 AVIOContext *pb = s->pb;
773 ebml_master chapters, editionentry;
774 AVRational scale = {1, 1E9};
777 if (!s->nb_chapters || mkv->wrote_chapters)
780 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
781 if (ret < 0) return ret;
783 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
784 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
785 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
786 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
787 for (i = 0; i < s->nb_chapters; i++) {
788 ebml_master chapteratom, chapterdisplay;
789 AVChapter *c = s->chapters[i];
790 AVDictionaryEntry *t = NULL;
792 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
793 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
794 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
795 av_rescale_q(c->start, c->time_base, scale));
796 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
797 av_rescale_q(c->end, c->time_base, scale));
798 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
799 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
800 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
801 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
802 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
803 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
804 end_ebml_master(pb, chapterdisplay);
806 end_ebml_master(pb, chapteratom);
808 end_ebml_master(pb, editionentry);
809 end_ebml_master(pb, chapters);
811 mkv->wrote_chapters = 1;
815 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
817 uint8_t *key = av_strdup(t->key);
819 const uint8_t *lang = NULL;
822 if ((p = strrchr(p, '-')) &&
823 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
830 else if (*p >= 'a' && *p <= 'z')
835 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
836 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
838 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
839 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
840 end_ebml_master(pb, tag);
845 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
846 unsigned int uid, ebml_master *tags)
848 MatroskaMuxContext *mkv = s->priv_data;
849 ebml_master tag, targets;
850 AVDictionaryEntry *t = NULL;
854 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
855 if (ret < 0) return ret;
857 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
860 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
861 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
863 put_ebml_uint(s->pb, elementid, uid);
864 end_ebml_master(s->pb, targets);
866 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
867 if (av_strcasecmp(t->key, "title") &&
868 av_strcasecmp(t->key, "encoding_tool"))
869 mkv_write_simpletag(s->pb, t);
871 end_ebml_master(s->pb, tag);
875 static int mkv_write_tags(AVFormatContext *s)
877 ebml_master tags = {0};
880 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
882 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
883 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
884 if (ret < 0) return ret;
887 for (i = 0; i < s->nb_streams; i++) {
888 AVStream *st = s->streams[i];
890 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
893 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
894 if (ret < 0) return ret;
897 for (i = 0; i < s->nb_chapters; i++) {
898 AVChapter *ch = s->chapters[i];
900 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
903 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
904 if (ret < 0) return ret;
908 end_ebml_master(s->pb, tags);
912 static int mkv_write_attachments(AVFormatContext *s)
914 MatroskaMuxContext *mkv = s->priv_data;
915 AVIOContext *pb = s->pb;
916 ebml_master attachments;
920 if (!mkv->have_attachments)
923 av_lfg_init(&c, av_get_random_seed());
925 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
926 if (ret < 0) return ret;
928 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
930 for (i = 0; i < s->nb_streams; i++) {
931 AVStream *st = s->streams[i];
932 ebml_master attached_file;
933 AVDictionaryEntry *t;
934 const char *mimetype = NULL;
936 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
939 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
941 if (t = av_dict_get(st->metadata, "title", NULL, 0))
942 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
943 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
944 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
945 return AVERROR(EINVAL);
947 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
948 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
950 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
952 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
953 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
954 mimetype = ff_mkv_mime_tags[i].str;
959 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
960 "it cannot be deduced from the codec id.\n", i);
961 return AVERROR(EINVAL);
964 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
965 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
966 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
967 end_ebml_master(pb, attached_file);
969 end_ebml_master(pb, attachments);
974 static int mkv_write_header(AVFormatContext *s)
976 MatroskaMuxContext *mkv = s->priv_data;
977 AVIOContext *pb = s->pb;
978 ebml_master ebml_header, segment_info;
979 AVDictionaryEntry *tag;
982 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
983 else mkv->mode = MODE_MATROSKAv2;
985 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
987 return AVERROR(ENOMEM);
989 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
990 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
991 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
992 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
993 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
994 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
995 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
996 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
997 end_ebml_master(pb, ebml_header);
999 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1000 mkv->segment_offset = avio_tell(pb);
1002 // we write 2 seek heads - one at the end of the file to point to each
1003 // cluster, and one at the beginning to point to all other level one
1004 // elements (including the seek head at the end of the file), which
1005 // isn't more than 10 elements if we only write one of each other
1006 // currently defined level 1 element
1007 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1008 if (!mkv->main_seekhead)
1009 return AVERROR(ENOMEM);
1011 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1012 if (ret < 0) return ret;
1014 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1015 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1016 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1017 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1018 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1019 uint32_t segment_uid[4];
1022 av_lfg_init(&lfg, av_get_random_seed());
1024 for (i = 0; i < 4; i++)
1025 segment_uid[i] = av_lfg_get(&lfg);
1027 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1028 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1029 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1031 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1032 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1035 // reserve space for the duration
1037 mkv->duration_offset = avio_tell(pb);
1038 put_ebml_void(pb, 11); // assumes double-precision float to be written
1039 end_ebml_master(pb, segment_info);
1041 ret = mkv_write_tracks(s);
1042 if (ret < 0) return ret;
1044 if (mkv->mode != MODE_WEBM) {
1045 ret = mkv_write_chapters(s);
1046 if (ret < 0) return ret;
1048 ret = mkv_write_tags(s);
1049 if (ret < 0) return ret;
1051 ret = mkv_write_attachments(s);
1052 if (ret < 0) return ret;
1055 if (!s->pb->seekable)
1056 mkv_write_seekhead(pb, mkv->main_seekhead);
1058 mkv->cues = mkv_start_cues(mkv->segment_offset);
1059 if (mkv->cues == NULL)
1060 return AVERROR(ENOMEM);
1062 if (pb->seekable && mkv->reserve_cues_space) {
1063 mkv->cues_pos = avio_tell(pb);
1064 put_ebml_void(pb, mkv->reserve_cues_space);
1067 av_init_packet(&mkv->cur_audio_pkt);
1068 mkv->cur_audio_pkt.size = 0;
1072 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1073 // after 4k and on a keyframe
1075 if (mkv->cluster_time_limit < 0)
1076 mkv->cluster_time_limit = 5000;
1077 if (mkv->cluster_size_limit < 0)
1078 mkv->cluster_size_limit = 5 * 1024 * 1024;
1080 if (mkv->cluster_time_limit < 0)
1081 mkv->cluster_time_limit = 1000;
1082 if (mkv->cluster_size_limit < 0)
1083 mkv->cluster_size_limit = 32 * 1024;
1089 static int mkv_blockgroup_size(int pkt_size)
1091 int size = pkt_size + 4;
1092 size += ebml_num_size(size);
1093 size += 2; // EBML ID for block and block duration
1094 size += 8; // max size of block duration
1095 size += ebml_num_size(size);
1096 size += 1; // blockgroup EBML ID
1100 static int ass_get_duration(const uint8_t *p)
1102 int sh, sm, ss, sc, eh, em, es, ec;
1103 uint64_t start, end;
1105 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1106 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1108 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1109 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1113 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1115 MatroskaMuxContext *mkv = s->priv_data;
1116 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1117 uint8_t *start, *end, *data = pkt->data;
1118 ebml_master blockgroup;
1122 int duration = ass_get_duration(data);
1123 max_duration = FFMAX(duration, max_duration);
1124 end = memchr(data, '\n', data_size);
1125 size = line_size = end ? end-data+1 : data_size;
1126 size -= end ? (end[-1]=='\r')+1 : 0;
1128 for (i=0; i<3; i++, start++)
1129 if (!(start = memchr(start, ',', size-(start-data))))
1130 return max_duration;
1131 size -= start - data;
1132 sscanf(data, "Dialogue: %d,", &layer);
1133 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1134 s->streams[pkt->stream_index]->nb_frames, layer);
1135 size = FFMIN(i+size, sizeof(buffer));
1136 memcpy(buffer+i, start, size-i);
1138 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1139 "pts %" PRId64 ", duration %d\n",
1140 avio_tell(pb), size, pkt->pts, duration);
1141 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1142 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1143 put_ebml_num(pb, size+4, 0);
1144 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1145 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1147 avio_write(pb, buffer, size);
1148 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1149 end_ebml_master(pb, blockgroup);
1152 data_size -= line_size;
1155 return max_duration;
1158 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1165 dst = av_malloc(srclen);
1167 return AVERROR(ENOMEM);
1169 while (srclen >= WV_HEADER_SIZE) {
1172 ret = ff_wv_parse_header(&header, src);
1175 src += WV_HEADER_SIZE;
1176 srclen -= WV_HEADER_SIZE;
1178 if (srclen < header.blocksize) {
1179 ret = AVERROR_INVALIDDATA;
1183 if (header.initial) {
1184 AV_WL32(dst + offset, header.samples);
1187 AV_WL32(dst + offset, header.flags);
1188 AV_WL32(dst + offset + 4, header.crc);
1191 if (!(header.initial && header.final)) {
1192 AV_WL32(dst + offset, header.blocksize);
1196 memcpy(dst + offset, src, header.blocksize);
1197 src += header.blocksize;
1198 srclen -= header.blocksize;
1199 offset += header.blocksize;
1211 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1212 unsigned int blockid, AVPacket *pkt, int flags)
1214 MatroskaMuxContext *mkv = s->priv_data;
1215 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1216 uint8_t *data = NULL;
1217 int offset = 0, size = pkt->size;
1218 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1220 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1221 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1222 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1223 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1224 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1225 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1226 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1227 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1228 /* extradata is Annex B, assume the bitstream is too and convert it */
1229 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1230 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1231 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1233 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1239 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1240 /* Matroska specification requires to remove the first QuickTime atom
1246 put_ebml_id(pb, blockid);
1247 put_ebml_num(pb, size+4, 0);
1248 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1249 avio_wb16(pb, ts - mkv->cluster_pts);
1251 avio_write(pb, data + offset, size);
1252 if (data != pkt->data)
1256 static int srt_get_duration(uint8_t **buf)
1258 int i, duration = 0;
1260 for (i=0; i<2 && !duration; i++) {
1261 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1262 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1263 &s_hour, &s_min, &s_sec, &s_hsec,
1264 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1265 s_min += 60*s_hour; e_min += 60*e_hour;
1266 s_sec += 60*s_min; e_sec += 60*e_min;
1267 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1268 duration = e_hsec - s_hsec;
1270 *buf += strcspn(*buf, "\n") + 1;
1275 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1277 ebml_master blockgroup;
1278 AVPacket pkt2 = *pkt;
1279 int64_t duration = srt_get_duration(&pkt2.data);
1280 pkt2.size -= pkt2.data - pkt->data;
1282 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1283 mkv_blockgroup_size(pkt2.size));
1284 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1285 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1286 end_ebml_master(pb, blockgroup);
1291 static void mkv_flush_dynbuf(AVFormatContext *s)
1293 MatroskaMuxContext *mkv = s->priv_data;
1300 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1301 avio_write(s->pb, dyn_buf, bufsize);
1306 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1308 MatroskaMuxContext *mkv = s->priv_data;
1309 AVIOContext *pb = s->pb;
1310 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1311 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1312 int duration = pkt->duration;
1314 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1316 if (ts == AV_NOPTS_VALUE) {
1317 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1318 return AVERROR(EINVAL);
1320 ts += mkv->tracks[pkt->stream_index].ts_offset;
1322 if (!s->pb->seekable) {
1324 avio_open_dyn_buf(&mkv->dyn_bc);
1328 if (!mkv->cluster_pos) {
1329 mkv->cluster_pos = avio_tell(s->pb);
1330 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1331 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1332 mkv->cluster_pts = FFMAX(0, ts);
1335 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1336 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1337 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1338 duration = mkv_write_ass_blocks(s, pb, pkt);
1339 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1340 duration = mkv_write_srt_blocks(s, pb, pkt);
1342 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1343 duration = pkt->convergence_duration;
1344 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1345 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1346 end_ebml_master(pb, blockgroup);
1349 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1350 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1351 if (ret < 0) return ret;
1354 mkv->duration = FFMAX(mkv->duration, ts + duration);
1358 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1360 MatroskaMuxContext *mkv = s->priv_data;
1361 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1362 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1364 int64_t cluster_time;
1368 if (mkv->tracks[pkt->stream_index].write_dts)
1369 cluster_time = pkt->dts - mkv->cluster_pts;
1371 cluster_time = pkt->pts - mkv->cluster_pts;
1372 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1374 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1375 // after 4k and on a keyframe
1376 if (s->pb->seekable) {
1378 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1381 cluster_size = avio_tell(pb);
1384 if (mkv->cluster_pos &&
1385 (cluster_size > mkv->cluster_size_limit ||
1386 cluster_time > mkv->cluster_time_limit ||
1387 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1388 cluster_size > 4 * 1024))) {
1389 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1390 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1391 avio_tell(pb), pkt->pts, pkt->dts);
1392 end_ebml_master(pb, mkv->cluster);
1393 mkv->cluster_pos = 0;
1395 mkv_flush_dynbuf(s);
1399 // check if we have an audio packet cached
1400 if (mkv->cur_audio_pkt.size > 0) {
1401 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1402 av_free_packet(&mkv->cur_audio_pkt);
1404 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1409 // buffer an audio packet to ensure the packet containing the video
1410 // keyframe's timecode is contained in the same cluster for WebM
1411 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1412 mkv->cur_audio_pkt = *pkt;
1414 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1415 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1417 ret = av_dup_packet(&mkv->cur_audio_pkt);
1419 ret = mkv_write_packet_internal(s, pkt);
1423 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1425 MatroskaMuxContext *mkv = s->priv_data;
1427 if (s->pb->seekable)
1432 if (mkv->cluster_pos) {
1433 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1434 " bytes\n", avio_tell(pb));
1435 end_ebml_master(pb, mkv->cluster);
1436 mkv->cluster_pos = 0;
1438 mkv_flush_dynbuf(s);
1443 return mkv_write_packet(s, pkt);
1446 static int mkv_write_trailer(AVFormatContext *s)
1448 MatroskaMuxContext *mkv = s->priv_data;
1449 AVIOContext *pb = s->pb;
1450 int64_t currentpos, cuespos;
1453 // check if we have an audio packet cached
1454 if (mkv->cur_audio_pkt.size > 0) {
1455 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1456 av_free_packet(&mkv->cur_audio_pkt);
1458 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1464 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1465 mkv_flush_dynbuf(s);
1466 } else if (mkv->cluster_pos) {
1467 end_ebml_master(pb, mkv->cluster);
1470 if (mkv->mode != MODE_WEBM) {
1471 ret = mkv_write_chapters(s);
1472 if (ret < 0) return ret;
1476 if (mkv->cues->num_entries) {
1477 if (mkv->reserve_cues_space) {
1480 currentpos = avio_tell(pb);
1481 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1483 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1484 cues_end = avio_tell(pb);
1485 if (cues_end > cuespos + mkv->reserve_cues_space) {
1486 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1487 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1488 cues_end - cuespos);
1489 return AVERROR(EINVAL);
1492 if (cues_end < cuespos + mkv->reserve_cues_space)
1493 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1495 avio_seek(pb, currentpos, SEEK_SET);
1497 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1500 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1501 if (ret < 0) return ret;
1504 mkv_write_seekhead(pb, mkv->main_seekhead);
1506 // update the duration
1507 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1508 currentpos = avio_tell(pb);
1509 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1510 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1512 avio_seek(pb, currentpos, SEEK_SET);
1515 end_ebml_master(pb, mkv->segment);
1516 av_free(mkv->tracks);
1517 av_freep(&mkv->cues->entries);
1518 av_freep(&mkv->cues);
1523 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1526 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1527 if (ff_mkv_codec_tags[i].id == codec_id)
1530 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1531 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1532 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1539 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1540 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1541 static const AVOption options[] = {
1542 { "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 },
1543 { "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 },
1544 { "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 },
1548 #if CONFIG_MATROSKA_MUXER
1549 static const AVClass matroska_class = {
1550 .class_name = "matroska muxer",
1551 .item_name = av_default_item_name,
1553 .version = LIBAVUTIL_VERSION_INT,
1556 AVOutputFormat ff_matroska_muxer = {
1558 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1559 .mime_type = "video/x-matroska",
1560 .extensions = "mkv",
1561 .priv_data_size = sizeof(MatroskaMuxContext),
1562 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1563 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1564 .video_codec = CONFIG_LIBX264_ENCODER ?
1565 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1566 .write_header = mkv_write_header,
1567 .write_packet = mkv_write_flush_packet,
1568 .write_trailer = mkv_write_trailer,
1569 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1570 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1571 .codec_tag = (const AVCodecTag* const []){
1572 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1574 .subtitle_codec = AV_CODEC_ID_SSA,
1575 .query_codec = mkv_query_codec,
1576 .priv_class = &matroska_class,
1580 #if CONFIG_WEBM_MUXER
1581 static const AVClass webm_class = {
1582 .class_name = "webm muxer",
1583 .item_name = av_default_item_name,
1585 .version = LIBAVUTIL_VERSION_INT,
1588 AVOutputFormat ff_webm_muxer = {
1590 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1591 .mime_type = "video/webm",
1592 .extensions = "webm",
1593 .priv_data_size = sizeof(MatroskaMuxContext),
1594 .audio_codec = AV_CODEC_ID_VORBIS,
1595 .video_codec = AV_CODEC_ID_VP8,
1596 .write_header = mkv_write_header,
1597 .write_packet = mkv_write_flush_packet,
1598 .write_trailer = mkv_write_trailer,
1599 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1600 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1601 .priv_class = &webm_class,
1605 #if CONFIG_MATROSKA_AUDIO_MUXER
1606 static const AVClass mka_class = {
1607 .class_name = "matroska audio muxer",
1608 .item_name = av_default_item_name,
1610 .version = LIBAVUTIL_VERSION_INT,
1612 AVOutputFormat ff_matroska_audio_muxer = {
1614 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1615 .mime_type = "audio/x-matroska",
1616 .extensions = "mka",
1617 .priv_data_size = sizeof(MatroskaMuxContext),
1618 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1619 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1620 .video_codec = AV_CODEC_ID_NONE,
1621 .write_header = mkv_write_header,
1622 .write_packet = mkv_write_flush_packet,
1623 .write_trailer = mkv_write_trailer,
1624 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1626 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1627 .priv_class = &mka_class,