3 * Copyright (c) 2007 David Conrad
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "avlanguage.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/intfloat.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/lfg.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/random_seed.h"
40 #include "libavutil/samplefmt.h"
42 #include "libavcodec/xiph.h"
43 #include "libavcodec/mpeg4audio.h"
45 typedef struct ebml_master {
46 int64_t pos; ///< absolute offset in the file where the master's elements start
47 int sizebytes; ///< how many bytes were reserved for the size
50 typedef struct mkv_seekhead_entry {
51 unsigned int elementid;
55 typedef struct mkv_seekhead {
57 int64_t segment_offset; ///< the file offset to the beginning of the segment
58 int reserved_size; ///< -1 if appending to file
60 mkv_seekhead_entry *entries;
67 int64_t cluster_pos; ///< file offset of the cluster containing the block
71 int64_t segment_offset;
72 mkv_cuepoint *entries;
80 #define MODE_MATROSKAv2 0x01
81 #define MODE_WEBM 0x02
83 typedef struct MatroskaMuxContext {
88 int64_t segment_offset;
90 int64_t cluster_pos; ///< file offset of the current cluster
92 int64_t duration_offset;
94 mkv_seekhead *main_seekhead;
98 AVPacket cur_audio_pkt;
100 int have_attachments;
102 int reserve_cues_space;
104 } MatroskaMuxContext;
107 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
108 * offset, 4 bytes for target EBML ID */
109 #define MAX_SEEKENTRY_SIZE 21
111 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
113 #define MAX_CUETRACKPOS_SIZE 22
115 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
116 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
119 static int ebml_id_size(unsigned int id)
121 return (av_log2(id+1)-1)/7+1;
124 static void put_ebml_id(AVIOContext *pb, unsigned int id)
126 int i = ebml_id_size(id);
128 avio_w8(pb, id >> (i*8));
132 * Write an EBML size meaning "unknown size".
134 * @param bytes The number of bytes the size should occupy (maximum: 8).
136 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
139 avio_w8(pb, 0x1ff >> bytes);
145 * Calculate how many bytes are needed to represent a given number in EBML.
147 static int ebml_num_size(uint64_t num)
150 while ((num+1) >> bytes*7) bytes++;
155 * Write a number in EBML variable length format.
157 * @param bytes The number of bytes that need to be used to write the number.
158 * If zero, any number of bytes can be used.
160 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
162 int i, needed_bytes = ebml_num_size(num);
164 // sizes larger than this are currently undefined in EBML
165 assert(num < (1ULL<<56)-1);
168 // don't care how many bytes are used, so use the min
169 bytes = needed_bytes;
170 // the bytes needed to write the given size would exceed the bytes
171 // that we need to use, so write unknown size. This shouldn't happen.
172 assert(bytes >= needed_bytes);
174 num |= 1ULL << bytes*7;
175 for (i = bytes - 1; i >= 0; i--)
176 avio_w8(pb, num >> i*8);
179 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
183 while (tmp>>=8) bytes++;
185 put_ebml_id(pb, elementid);
186 put_ebml_num(pb, bytes, 0);
187 for (i = bytes - 1; i >= 0; i--)
188 avio_w8(pb, val >> i*8);
191 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
193 put_ebml_id(pb, elementid);
194 put_ebml_num(pb, 8, 0);
195 avio_wb64(pb, av_double2int(val));
198 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
199 const void *buf, int size)
201 put_ebml_id(pb, elementid);
202 put_ebml_num(pb, size, 0);
203 avio_write(pb, buf, size);
206 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
208 put_ebml_binary(pb, elementid, str, strlen(str));
212 * Write a void element of a given size. Useful for reserving space in
213 * the file to be written to later.
215 * @param size The number of bytes to reserve, which must be at least 2.
217 static void put_ebml_void(AVIOContext *pb, uint64_t size)
219 int64_t currentpos = avio_tell(pb);
223 put_ebml_id(pb, EBML_ID_VOID);
224 // we need to subtract the length needed to store the size from the
225 // size we need to reserve so 2 cases, we use 8 bytes to store the
226 // size if possible, 1 byte otherwise
228 put_ebml_num(pb, size-1, 0);
230 put_ebml_num(pb, size-9, 8);
231 while(avio_tell(pb) < currentpos + size)
235 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
237 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
238 put_ebml_id(pb, elementid);
239 put_ebml_size_unknown(pb, bytes);
240 return (ebml_master){ avio_tell(pb), bytes };
243 static void end_ebml_master(AVIOContext *pb, ebml_master master)
245 int64_t pos = avio_tell(pb);
247 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
249 put_ebml_num(pb, pos - master.pos, master.sizebytes);
250 avio_seek(pb, pos, SEEK_SET);
253 static void put_xiph_size(AVIOContext *pb, int size)
256 for (i = 0; i < size / 255; i++)
258 avio_w8(pb, size % 255);
262 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
263 * elements. If a maximum number of elements is specified, enough space
264 * will be reserved at the current file location to write a seek head of
267 * @param segment_offset The absolute offset to the position in the file
268 * where the segment begins.
269 * @param numelements The maximum number of elements that will be indexed
270 * by this seek head, 0 if unlimited.
272 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
274 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
275 if (new_seekhead == NULL)
278 new_seekhead->segment_offset = segment_offset;
280 if (numelements > 0) {
281 new_seekhead->filepos = avio_tell(pb);
282 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
283 // and size, and 3 bytes to guarantee that an EBML void element
284 // will fit afterwards
285 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
286 new_seekhead->max_entries = numelements;
287 put_ebml_void(pb, new_seekhead->reserved_size);
292 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
294 mkv_seekhead_entry *entries = seekhead->entries;
296 // don't store more elements than we reserved space for
297 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
300 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
302 return AVERROR(ENOMEM);
304 entries[seekhead->num_entries ].elementid = elementid;
305 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
307 seekhead->entries = entries;
312 * Write the seek head to the file and free it. If a maximum number of
313 * elements was specified to mkv_start_seekhead(), the seek head will
314 * be written at the location reserved for it. Otherwise, it is written
315 * at the current location in the file.
317 * @return The file offset where the seekhead was written,
318 * -1 if an error occurred.
320 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
322 ebml_master metaseek, seekentry;
326 currentpos = avio_tell(pb);
328 if (seekhead->reserved_size > 0) {
329 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
335 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
336 for (i = 0; i < seekhead->num_entries; i++) {
337 mkv_seekhead_entry *entry = &seekhead->entries[i];
339 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
341 put_ebml_id(pb, MATROSKA_ID_SEEKID);
342 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
343 put_ebml_id(pb, entry->elementid);
345 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
346 end_ebml_master(pb, seekentry);
348 end_ebml_master(pb, metaseek);
350 if (seekhead->reserved_size > 0) {
351 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
352 put_ebml_void(pb, remaining);
353 avio_seek(pb, currentpos, SEEK_SET);
355 currentpos = seekhead->filepos;
358 av_free(seekhead->entries);
364 static mkv_cues * mkv_start_cues(int64_t segment_offset)
366 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
370 cues->segment_offset = segment_offset;
374 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
376 mkv_cuepoint *entries = cues->entries;
381 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
383 return AVERROR(ENOMEM);
385 entries[cues->num_entries ].pts = ts;
386 entries[cues->num_entries ].tracknum = stream + 1;
387 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
389 cues->entries = entries;
393 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
395 ebml_master cues_element;
399 currentpos = avio_tell(pb);
400 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
402 for (i = 0; i < cues->num_entries; i++) {
403 ebml_master cuepoint, track_positions;
404 mkv_cuepoint *entry = &cues->entries[i];
405 uint64_t pts = entry->pts;
407 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
408 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
410 // put all the entries from different tracks that have the exact same
411 // timestamp into the same CuePoint
412 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
413 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
414 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
415 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
416 end_ebml_master(pb, track_positions);
419 end_ebml_master(pb, cuepoint);
421 end_ebml_master(pb, cues_element);
426 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
428 uint8_t *header_start[3];
430 int first_header_size;
433 if (codec->codec_id == AV_CODEC_ID_VORBIS)
434 first_header_size = 30;
436 first_header_size = 42;
438 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
439 first_header_size, header_start, header_len) < 0) {
440 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
444 avio_w8(pb, 2); // number packets - 1
445 for (j = 0; j < 2; j++) {
446 put_xiph_size(pb, header_len[j]);
448 for (j = 0; j < 3; j++)
449 avio_write(pb, header_start[j], header_len[j]);
454 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
456 if (codec->extradata && codec->extradata_size == 2)
457 avio_write(pb, codec->extradata, 2);
459 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
463 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
465 MPEG4AudioConfig mp4ac;
467 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
468 codec->extradata_size * 8, 1) < 0) {
469 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
473 *sample_rate = mp4ac.sample_rate;
474 *output_sample_rate = mp4ac.ext_sample_rate;
477 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
481 int ret, codecpriv_size;
483 ret = avio_open_dyn_buf(&dyn_cp);
488 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
489 ret = put_xiph_codecpriv(s, dyn_cp, codec);
490 else if (codec->codec_id == AV_CODEC_ID_FLAC)
491 ret = ff_flac_write_header(dyn_cp, codec, 1);
492 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
493 ret = put_wv_codecpriv(dyn_cp, codec);
494 else if (codec->codec_id == AV_CODEC_ID_H264)
495 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
496 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
497 if (codec->extradata_size < 36) {
498 av_log(s, AV_LOG_ERROR,
499 "Invalid extradata found, ALAC expects a 36-byte "
501 ret = AVERROR_INVALIDDATA;
503 avio_write(dyn_cp, codec->extradata + 12,
504 codec->extradata_size - 12);
506 else if (codec->extradata_size)
507 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
508 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
510 if (!codec->codec_tag)
511 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
512 if (codec->extradata_size)
513 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
515 if (!codec->codec_tag)
516 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
517 if (!codec->codec_tag) {
518 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
522 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
525 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
527 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
529 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
532 if (!codec->codec_tag)
533 codec->codec_tag = tag;
535 ff_put_wav_header(dyn_cp, codec);
538 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
540 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
545 static int mkv_write_tracks(AVFormatContext *s)
547 MatroskaMuxContext *mkv = s->priv_data;
548 AVIOContext *pb = s->pb;
552 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
553 if (ret < 0) return ret;
555 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
556 for (i = 0; i < s->nb_streams; i++) {
557 AVStream *st = s->streams[i];
558 AVCodecContext *codec = st->codec;
559 ebml_master subinfo, track;
562 int bit_depth = av_get_bits_per_sample(codec->codec_id);
563 int sample_rate = codec->sample_rate;
564 int output_sample_rate = 0;
565 AVDictionaryEntry *tag;
567 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
568 mkv->have_attachments = 1;
573 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
575 if (codec->codec_id == AV_CODEC_ID_AAC)
576 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
578 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
579 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
580 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
581 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
583 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
584 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
585 tag = av_dict_get(st->metadata, "language", NULL, 0);
586 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
589 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
591 // look for a codec ID string specific to mkv to use,
592 // if none are found, use AVI codes
593 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
594 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
595 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
601 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
602 codec->codec_id == AV_CODEC_ID_VORBIS)) {
603 av_log(s, AV_LOG_ERROR,
604 "Only VP8 video and Vorbis audio are supported for WebM.\n");
605 return AVERROR(EINVAL);
608 switch (codec->codec_type) {
609 case AVMEDIA_TYPE_VIDEO:
610 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
611 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
614 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
615 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
616 || codec->codec_id == AV_CODEC_ID_SVQ1
617 || codec->codec_id == AV_CODEC_ID_SVQ3
618 || codec->codec_id == AV_CODEC_ID_CINEPAK))
622 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
623 else if (!native_id) {
624 // if there is no mkv-specific codec ID, use VFW mode
625 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
626 mkv->tracks[i].write_dts = 1;
629 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
630 // XXX: interlace flag?
631 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
632 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
633 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
634 uint8_t stereo_fmt = atoi(tag->value);
639 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM
640 || stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
643 case MODE_MATROSKAv2:
644 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
650 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
652 if (st->sample_aspect_ratio.num) {
653 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
654 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
655 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
656 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
658 end_ebml_master(pb, subinfo);
661 case AVMEDIA_TYPE_AUDIO:
662 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
665 // no mkv-specific ID, use ACM mode
666 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
668 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
669 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
670 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
671 if (output_sample_rate)
672 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
674 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
675 end_ebml_master(pb, subinfo);
678 case AVMEDIA_TYPE_SUBTITLE:
679 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
681 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
682 return AVERROR(ENOSYS);
686 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
689 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
690 if (ret < 0) return ret;
692 end_ebml_master(pb, track);
694 // ms precision is the de-facto standard timescale for mkv files
695 avpriv_set_pts_info(st, 64, 1, 1000);
697 end_ebml_master(pb, tracks);
701 static int mkv_write_chapters(AVFormatContext *s)
703 MatroskaMuxContext *mkv = s->priv_data;
704 AVIOContext *pb = s->pb;
705 ebml_master chapters, editionentry;
706 AVRational scale = {1, 1E9};
712 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
713 if (ret < 0) return ret;
715 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
716 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
717 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
718 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
719 for (i = 0; i < s->nb_chapters; i++) {
720 ebml_master chapteratom, chapterdisplay;
721 AVChapter *c = s->chapters[i];
722 AVDictionaryEntry *t = NULL;
724 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
725 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
726 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
727 av_rescale_q(c->start, c->time_base, scale));
728 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
729 av_rescale_q(c->end, c->time_base, scale));
730 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
731 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
732 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
733 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
734 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
735 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
736 end_ebml_master(pb, chapterdisplay);
738 end_ebml_master(pb, chapteratom);
740 end_ebml_master(pb, editionentry);
741 end_ebml_master(pb, chapters);
745 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
747 uint8_t *key = av_strdup(t->key);
749 const uint8_t *lang = NULL;
752 if ((p = strrchr(p, '-')) &&
753 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
760 else if (*p >= 'a' && *p <= 'z')
765 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
766 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
768 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
769 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
770 end_ebml_master(pb, tag);
775 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
776 unsigned int uid, ebml_master *tags)
778 MatroskaMuxContext *mkv = s->priv_data;
779 ebml_master tag, targets;
780 AVDictionaryEntry *t = NULL;
784 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
785 if (ret < 0) return ret;
787 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
790 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
791 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
793 put_ebml_uint(s->pb, elementid, uid);
794 end_ebml_master(s->pb, targets);
796 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
797 if (av_strcasecmp(t->key, "title"))
798 mkv_write_simpletag(s->pb, t);
800 end_ebml_master(s->pb, tag);
804 static int mkv_write_tags(AVFormatContext *s)
806 ebml_master tags = {0};
809 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
811 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
812 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
813 if (ret < 0) return ret;
816 for (i = 0; i < s->nb_streams; i++) {
817 AVStream *st = s->streams[i];
819 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
822 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
823 if (ret < 0) return ret;
826 for (i = 0; i < s->nb_chapters; i++) {
827 AVChapter *ch = s->chapters[i];
829 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
832 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
833 if (ret < 0) return ret;
837 end_ebml_master(s->pb, tags);
841 static int mkv_write_attachments(AVFormatContext *s)
843 MatroskaMuxContext *mkv = s->priv_data;
844 AVIOContext *pb = s->pb;
845 ebml_master attachments;
849 if (!mkv->have_attachments)
852 av_lfg_init(&c, av_get_random_seed());
854 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
855 if (ret < 0) return ret;
857 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
859 for (i = 0; i < s->nb_streams; i++) {
860 AVStream *st = s->streams[i];
861 ebml_master attached_file;
862 AVDictionaryEntry *t;
863 const char *mimetype = NULL;
865 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
868 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
870 if (t = av_dict_get(st->metadata, "title", NULL, 0))
871 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
872 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
873 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
874 return AVERROR(EINVAL);
876 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
877 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
879 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
881 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
882 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
883 mimetype = ff_mkv_mime_tags[i].str;
888 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
889 "it cannot be deduced from the codec id.\n", i);
890 return AVERROR(EINVAL);
893 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
894 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
895 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
896 end_ebml_master(pb, attached_file);
898 end_ebml_master(pb, attachments);
903 static int mkv_write_header(AVFormatContext *s)
905 MatroskaMuxContext *mkv = s->priv_data;
906 AVIOContext *pb = s->pb;
907 ebml_master ebml_header, segment_info;
908 AVDictionaryEntry *tag;
911 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
912 else mkv->mode = MODE_MATROSKAv2;
914 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
916 return AVERROR(ENOMEM);
918 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
919 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
920 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
921 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
922 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
923 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
924 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
925 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
926 end_ebml_master(pb, ebml_header);
928 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
929 mkv->segment_offset = avio_tell(pb);
931 // we write 2 seek heads - one at the end of the file to point to each
932 // cluster, and one at the beginning to point to all other level one
933 // elements (including the seek head at the end of the file), which
934 // isn't more than 10 elements if we only write one of each other
935 // currently defined level 1 element
936 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
937 if (!mkv->main_seekhead)
938 return AVERROR(ENOMEM);
940 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
941 if (ret < 0) return ret;
943 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
944 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
945 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
946 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
947 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
948 uint32_t segment_uid[4];
951 av_lfg_init(&lfg, av_get_random_seed());
953 for (i = 0; i < 4; i++)
954 segment_uid[i] = av_lfg_get(&lfg);
956 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
957 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
958 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
961 // reserve space for the duration
963 mkv->duration_offset = avio_tell(pb);
964 put_ebml_void(pb, 11); // assumes double-precision float to be written
965 end_ebml_master(pb, segment_info);
967 ret = mkv_write_tracks(s);
968 if (ret < 0) return ret;
970 if (mkv->mode != MODE_WEBM) {
971 ret = mkv_write_chapters(s);
972 if (ret < 0) return ret;
974 ret = mkv_write_tags(s);
975 if (ret < 0) return ret;
977 ret = mkv_write_attachments(s);
978 if (ret < 0) return ret;
981 if (!s->pb->seekable)
982 mkv_write_seekhead(pb, mkv->main_seekhead);
984 mkv->cues = mkv_start_cues(mkv->segment_offset);
985 if (mkv->cues == NULL)
986 return AVERROR(ENOMEM);
988 if (pb->seekable && mkv->reserve_cues_space) {
989 mkv->cues_pos = avio_tell(pb);
990 put_ebml_void(pb, mkv->reserve_cues_space);
993 av_init_packet(&mkv->cur_audio_pkt);
994 mkv->cur_audio_pkt.size = 0;
1000 static int mkv_blockgroup_size(int pkt_size)
1002 int size = pkt_size + 4;
1003 size += ebml_num_size(size);
1004 size += 2; // EBML ID for block and block duration
1005 size += 8; // max size of block duration
1006 size += ebml_num_size(size);
1007 size += 1; // blockgroup EBML ID
1011 static int ass_get_duration(const uint8_t *p)
1013 int sh, sm, ss, sc, eh, em, es, ec;
1014 uint64_t start, end;
1016 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1017 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1019 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
1020 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
1024 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1026 MatroskaMuxContext *mkv = s->priv_data;
1027 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1028 uint8_t *start, *end, *data = pkt->data;
1029 ebml_master blockgroup;
1033 int duration = ass_get_duration(data);
1034 max_duration = FFMAX(duration, max_duration);
1035 end = memchr(data, '\n', data_size);
1036 size = line_size = end ? end-data+1 : data_size;
1037 size -= end ? (end[-1]=='\r')+1 : 0;
1039 for (i=0; i<3; i++, start++)
1040 if (!(start = memchr(start, ',', size-(start-data))))
1041 return max_duration;
1042 size -= start - data;
1043 sscanf(data, "Dialogue: %d,", &layer);
1044 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1045 s->streams[pkt->stream_index]->nb_frames, layer);
1046 size = FFMIN(i+size, sizeof(buffer));
1047 memcpy(buffer+i, start, size-i);
1049 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1050 "pts %" PRId64 ", duration %d\n",
1051 avio_tell(pb), size, pkt->pts, duration);
1052 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1053 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1054 put_ebml_num(pb, size+4, 0);
1055 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1056 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1058 avio_write(pb, buffer, size);
1059 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1060 end_ebml_master(pb, blockgroup);
1063 data_size -= line_size;
1066 return max_duration;
1069 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1076 dst = av_malloc(srclen);
1078 return AVERROR(ENOMEM);
1080 while (srclen >= WV_HEADER_SIZE) {
1083 ret = ff_wv_parse_header(&header, src);
1086 src += WV_HEADER_SIZE;
1087 srclen -= WV_HEADER_SIZE;
1089 if (srclen < header.blocksize) {
1090 ret = AVERROR_INVALIDDATA;
1094 if (header.initial) {
1095 AV_WL32(dst + offset, header.samples);
1098 AV_WL32(dst + offset, header.flags);
1099 AV_WL32(dst + offset + 4, header.crc);
1102 if (!(header.initial && header.final)) {
1103 AV_WL32(dst + offset, header.blocksize);
1107 memcpy(dst + offset, src, header.blocksize);
1108 src += header.blocksize;
1109 srclen -= header.blocksize;
1110 offset += header.blocksize;
1122 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1123 unsigned int blockid, AVPacket *pkt, int flags)
1125 MatroskaMuxContext *mkv = s->priv_data;
1126 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1127 uint8_t *data = NULL;
1128 int offset = 0, size = pkt->size;
1129 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1131 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1132 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1133 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1134 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1135 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1136 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1137 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1138 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1140 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1146 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1147 /* Matroska specification requires to remove the first QuickTime atom
1153 put_ebml_id(pb, blockid);
1154 put_ebml_num(pb, size+4, 0);
1155 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1156 avio_wb16(pb, ts - mkv->cluster_pts);
1158 avio_write(pb, data + offset, size);
1159 if (data != pkt->data)
1163 static int srt_get_duration(uint8_t **buf)
1165 int i, duration = 0;
1167 for (i=0; i<2 && !duration; i++) {
1168 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1169 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1170 &s_hour, &s_min, &s_sec, &s_hsec,
1171 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1172 s_min += 60*s_hour; e_min += 60*e_hour;
1173 s_sec += 60*s_min; e_sec += 60*e_min;
1174 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1175 duration = e_hsec - s_hsec;
1177 *buf += strcspn(*buf, "\n") + 1;
1182 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1184 ebml_master blockgroup;
1185 AVPacket pkt2 = *pkt;
1186 int64_t duration = srt_get_duration(&pkt2.data);
1187 pkt2.size -= pkt2.data - pkt->data;
1189 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1190 mkv_blockgroup_size(pkt2.size));
1191 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1192 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1193 end_ebml_master(pb, blockgroup);
1198 static void mkv_flush_dynbuf(AVFormatContext *s)
1200 MatroskaMuxContext *mkv = s->priv_data;
1207 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1208 avio_write(s->pb, dyn_buf, bufsize);
1213 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1215 MatroskaMuxContext *mkv = s->priv_data;
1216 AVIOContext *pb = s->pb;
1217 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1218 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1219 int duration = pkt->duration;
1221 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1223 if (ts == AV_NOPTS_VALUE) {
1224 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1225 return AVERROR(EINVAL);
1228 if (!s->pb->seekable) {
1230 avio_open_dyn_buf(&mkv->dyn_bc);
1234 if (!mkv->cluster_pos) {
1235 mkv->cluster_pos = avio_tell(s->pb);
1236 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1237 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1238 mkv->cluster_pts = FFMAX(0, ts);
1241 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1242 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1243 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1244 duration = mkv_write_ass_blocks(s, pb, pkt);
1245 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1246 duration = mkv_write_srt_blocks(s, pb, pkt);
1248 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1249 duration = pkt->convergence_duration;
1250 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1251 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1252 end_ebml_master(pb, blockgroup);
1255 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1256 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1257 if (ret < 0) return ret;
1260 mkv->duration = FFMAX(mkv->duration, ts + duration);
1264 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1266 MatroskaMuxContext *mkv = s->priv_data;
1267 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1268 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1270 int cluster_size_limit;
1271 int64_t cluster_time;
1272 int64_t cluster_time_limit;
1276 if (mkv->tracks[pkt->stream_index].write_dts)
1277 cluster_time = pkt->dts - mkv->cluster_pts;
1279 cluster_time = pkt->pts - mkv->cluster_pts;
1281 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1282 // after 4k and on a keyframe
1283 if (s->pb->seekable) {
1285 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1286 cluster_time_limit = 5000;
1287 cluster_size_limit = 5 * 1024 * 1024;
1290 cluster_size = avio_tell(pb);
1291 cluster_time_limit = 1000;
1292 cluster_size_limit = 32 * 1024;
1295 if (mkv->cluster_pos &&
1296 (cluster_size > cluster_size_limit ||
1297 cluster_time > cluster_time_limit ||
1298 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1299 cluster_size > 4 * 1024))) {
1300 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1301 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1302 avio_tell(pb), pkt->pts, pkt->dts);
1303 end_ebml_master(pb, mkv->cluster);
1304 mkv->cluster_pos = 0;
1306 mkv_flush_dynbuf(s);
1309 // check if we have an audio packet cached
1310 if (mkv->cur_audio_pkt.size > 0) {
1311 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1312 av_free_packet(&mkv->cur_audio_pkt);
1314 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1319 // buffer an audio packet to ensure the packet containing the video
1320 // keyframe's timecode is contained in the same cluster for WebM
1321 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1322 mkv->cur_audio_pkt = *pkt;
1324 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1325 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1327 ret = av_dup_packet(&mkv->cur_audio_pkt);
1329 ret = mkv_write_packet_internal(s, pkt);
1333 static int mkv_write_trailer(AVFormatContext *s)
1335 MatroskaMuxContext *mkv = s->priv_data;
1336 AVIOContext *pb = s->pb;
1337 int64_t currentpos, cuespos;
1340 // check if we have an audio packet cached
1341 if (mkv->cur_audio_pkt.size > 0) {
1342 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1343 av_free_packet(&mkv->cur_audio_pkt);
1345 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1351 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1352 mkv_flush_dynbuf(s);
1353 } else if (mkv->cluster_pos) {
1354 end_ebml_master(pb, mkv->cluster);
1358 if (mkv->cues->num_entries) {
1359 if (mkv->reserve_cues_space) {
1362 currentpos = avio_tell(pb);
1363 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1365 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1366 cues_end = avio_tell(pb);
1367 if (cues_end > cuespos + mkv->reserve_cues_space) {
1368 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1369 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1370 cues_end - cuespos);
1371 return AVERROR(EINVAL);
1374 if (cues_end < cuespos + mkv->reserve_cues_space)
1375 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1377 avio_seek(pb, currentpos, SEEK_SET);
1379 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1382 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1383 if (ret < 0) return ret;
1386 mkv_write_seekhead(pb, mkv->main_seekhead);
1388 // update the duration
1389 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1390 currentpos = avio_tell(pb);
1391 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1392 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1394 avio_seek(pb, currentpos, SEEK_SET);
1397 end_ebml_master(pb, mkv->segment);
1398 av_free(mkv->tracks);
1399 av_freep(&mkv->cues->entries);
1400 av_freep(&mkv->cues);
1405 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1408 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1409 if (ff_mkv_codec_tags[i].id == codec_id)
1412 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1413 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1414 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1421 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1422 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1423 static const AVOption options[] = {
1424 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning "
1425 "of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1429 #if CONFIG_MATROSKA_MUXER
1430 static const AVClass matroska_class = {
1431 .class_name = "matroska muxer",
1432 .item_name = av_default_item_name,
1434 .version = LIBAVUTIL_VERSION_INT,
1437 AVOutputFormat ff_matroska_muxer = {
1439 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1440 .mime_type = "video/x-matroska",
1441 .extensions = "mkv",
1442 .priv_data_size = sizeof(MatroskaMuxContext),
1443 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1444 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1445 .video_codec = CONFIG_LIBX264_ENCODER ?
1446 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1447 .write_header = mkv_write_header,
1448 .write_packet = mkv_write_packet,
1449 .write_trailer = mkv_write_trailer,
1450 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1452 .codec_tag = (const AVCodecTag* const []){
1453 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1455 .subtitle_codec = AV_CODEC_ID_SSA,
1456 .query_codec = mkv_query_codec,
1457 .priv_class = &matroska_class,
1461 #if CONFIG_WEBM_MUXER
1462 static const AVClass webm_class = {
1463 .class_name = "webm muxer",
1464 .item_name = av_default_item_name,
1466 .version = LIBAVUTIL_VERSION_INT,
1469 AVOutputFormat ff_webm_muxer = {
1471 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1472 .mime_type = "video/webm",
1473 .extensions = "webm",
1474 .priv_data_size = sizeof(MatroskaMuxContext),
1475 .audio_codec = AV_CODEC_ID_VORBIS,
1476 .video_codec = AV_CODEC_ID_VP8,
1477 .write_header = mkv_write_header,
1478 .write_packet = mkv_write_packet,
1479 .write_trailer = mkv_write_trailer,
1480 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1482 .priv_class = &webm_class,
1486 #if CONFIG_MATROSKA_AUDIO_MUXER
1487 static const AVClass mka_class = {
1488 .class_name = "matroska audio muxer",
1489 .item_name = av_default_item_name,
1491 .version = LIBAVUTIL_VERSION_INT,
1493 AVOutputFormat ff_matroska_audio_muxer = {
1495 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1496 .mime_type = "audio/x-matroska",
1497 .extensions = "mka",
1498 .priv_data_size = sizeof(MatroskaMuxContext),
1499 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1500 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1501 .video_codec = AV_CODEC_ID_NONE,
1502 .write_header = mkv_write_header,
1503 .write_packet = mkv_write_packet,
1504 .write_trailer = mkv_write_trailer,
1505 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
1506 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1507 .priv_class = &mka_class,