3 * Copyright (c) 2007 David Conrad
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "avlanguage.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/dict.h"
33 #include "libavutil/intfloat.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/lfg.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/random_seed.h"
39 #include "libavutil/samplefmt.h"
40 #include "libavutil/sha.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;
81 #define MODE_MATROSKAv2 0x01
82 #define MODE_WEBM 0x02
84 typedef struct MatroskaMuxContext {
89 int64_t segment_offset;
91 int64_t cluster_pos; ///< file offset of the current cluster
93 int64_t duration_offset;
95 mkv_seekhead *main_seekhead;
99 AVPacket cur_audio_pkt;
101 int have_attachments;
103 int reserve_cues_space;
105 } MatroskaMuxContext;
108 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
109 * offset, 4 bytes for target EBML ID */
110 #define MAX_SEEKENTRY_SIZE 21
112 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
114 #define MAX_CUETRACKPOS_SIZE 22
116 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
117 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
120 static int ebml_id_size(unsigned int id)
122 return (av_log2(id+1)-1)/7+1;
125 static void put_ebml_id(AVIOContext *pb, unsigned int id)
127 int i = ebml_id_size(id);
129 avio_w8(pb, (uint8_t)(id >> (i*8)));
133 * Write an EBML size meaning "unknown size".
135 * @param bytes The number of bytes the size should occupy (maximum: 8).
137 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
139 av_assert0(bytes <= 8);
140 avio_w8(pb, 0x1ff >> bytes);
146 * Calculate how many bytes are needed to represent a given number in EBML.
148 static int ebml_num_size(uint64_t num)
151 while ((num+1) >> bytes*7) bytes++;
156 * Write a number in EBML variable length format.
158 * @param bytes The number of bytes that need to be used to write the number.
159 * If zero, any number of bytes can be used.
161 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
163 int i, needed_bytes = ebml_num_size(num);
165 // sizes larger than this are currently undefined in EBML
166 av_assert0(num < (1ULL<<56)-1);
169 // don't care how many bytes are used, so use the min
170 bytes = needed_bytes;
171 // the bytes needed to write the given size would exceed the bytes
172 // that we need to use, so write unknown size. This shouldn't happen.
173 av_assert0(bytes >= needed_bytes);
175 num |= 1ULL << bytes*7;
176 for (i = bytes - 1; i >= 0; i--)
177 avio_w8(pb, (uint8_t)(num >> i*8));
180 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
184 while (tmp>>=8) bytes++;
186 put_ebml_id(pb, elementid);
187 put_ebml_num(pb, bytes, 0);
188 for (i = bytes - 1; i >= 0; i--)
189 avio_w8(pb, (uint8_t)(val >> i*8));
192 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
194 put_ebml_id(pb, elementid);
195 put_ebml_num(pb, 8, 0);
196 avio_wb64(pb, av_double2int(val));
199 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
200 const void *buf, int size)
202 put_ebml_id(pb, elementid);
203 put_ebml_num(pb, size, 0);
204 avio_write(pb, buf, size);
207 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
209 put_ebml_binary(pb, elementid, str, strlen(str));
213 * Write a void element of a given size. Useful for reserving space in
214 * the file to be written to later.
216 * @param size The number of bytes to reserve, which must be at least 2.
218 static void put_ebml_void(AVIOContext *pb, uint64_t size)
220 int64_t currentpos = avio_tell(pb);
222 av_assert0(size >= 2);
224 put_ebml_id(pb, EBML_ID_VOID);
225 // we need to subtract the length needed to store the size from the
226 // size we need to reserve so 2 cases, we use 8 bytes to store the
227 // size if possible, 1 byte otherwise
229 put_ebml_num(pb, size-1, 0);
231 put_ebml_num(pb, size-9, 8);
232 while(avio_tell(pb) < currentpos + size)
236 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
238 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
239 put_ebml_id(pb, elementid);
240 put_ebml_size_unknown(pb, bytes);
241 return (ebml_master){ avio_tell(pb), bytes };
244 static void end_ebml_master(AVIOContext *pb, ebml_master master)
246 int64_t pos = avio_tell(pb);
248 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
250 put_ebml_num(pb, pos - master.pos, master.sizebytes);
251 avio_seek(pb, pos, SEEK_SET);
254 static void put_xiph_size(AVIOContext *pb, int size)
257 for (i = 0; i < size / 255; i++)
259 avio_w8(pb, size % 255);
263 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
264 * elements. If a maximum number of elements is specified, enough space
265 * will be reserved at the current file location to write a seek head of
268 * @param segment_offset The absolute offset to the position in the file
269 * where the segment begins.
270 * @param numelements The maximum number of elements that will be indexed
271 * by this seek head, 0 if unlimited.
273 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
275 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
276 if (new_seekhead == NULL)
279 new_seekhead->segment_offset = segment_offset;
281 if (numelements > 0) {
282 new_seekhead->filepos = avio_tell(pb);
283 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
284 // and size, and 3 bytes to guarantee that an EBML void element
285 // will fit afterwards
286 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
287 new_seekhead->max_entries = numelements;
288 put_ebml_void(pb, new_seekhead->reserved_size);
293 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
295 mkv_seekhead_entry *entries = seekhead->entries;
297 // don't store more elements than we reserved space for
298 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
301 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
303 return AVERROR(ENOMEM);
305 entries[seekhead->num_entries ].elementid = elementid;
306 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
308 seekhead->entries = entries;
313 * Write the seek head to the file and free it. If a maximum number of
314 * elements was specified to mkv_start_seekhead(), the seek head will
315 * be written at the location reserved for it. Otherwise, it is written
316 * at the current location in the file.
318 * @return The file offset where the seekhead was written,
319 * -1 if an error occurred.
321 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
323 ebml_master metaseek, seekentry;
327 currentpos = avio_tell(pb);
329 if (seekhead->reserved_size > 0) {
330 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
336 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
337 for (i = 0; i < seekhead->num_entries; i++) {
338 mkv_seekhead_entry *entry = &seekhead->entries[i];
340 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
342 put_ebml_id(pb, MATROSKA_ID_SEEKID);
343 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
344 put_ebml_id(pb, entry->elementid);
346 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
347 end_ebml_master(pb, seekentry);
349 end_ebml_master(pb, metaseek);
351 if (seekhead->reserved_size > 0) {
352 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
353 put_ebml_void(pb, remaining);
354 avio_seek(pb, currentpos, SEEK_SET);
356 currentpos = seekhead->filepos;
359 av_free(seekhead->entries);
365 static mkv_cues * mkv_start_cues(int64_t segment_offset)
367 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
371 cues->segment_offset = segment_offset;
375 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
377 mkv_cuepoint *entries = cues->entries;
382 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
384 return AVERROR(ENOMEM);
386 entries[cues->num_entries ].pts = ts;
387 entries[cues->num_entries ].tracknum = stream + 1;
388 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
390 cues->entries = entries;
394 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
396 ebml_master cues_element;
400 currentpos = avio_tell(pb);
401 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
403 for (i = 0; i < cues->num_entries; i++) {
404 ebml_master cuepoint, track_positions;
405 mkv_cuepoint *entry = &cues->entries[i];
406 uint64_t pts = entry->pts;
408 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
409 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
411 // put all the entries from different tracks that have the exact same
412 // timestamp into the same CuePoint
413 for (j = 0; j < num_tracks; j++)
414 tracks[j].has_cue = 0;
415 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
416 int tracknum = entry[j].tracknum - 1;
417 av_assert0(tracknum>=0 && tracknum<num_tracks);
418 if (tracks[tracknum].has_cue)
420 tracks[tracknum].has_cue = 1;
421 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
422 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
423 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
424 end_ebml_master(pb, track_positions);
427 end_ebml_master(pb, cuepoint);
429 end_ebml_master(pb, cues_element);
434 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
436 uint8_t *header_start[3];
438 int first_header_size;
441 if (codec->codec_id == AV_CODEC_ID_VORBIS)
442 first_header_size = 30;
444 first_header_size = 42;
446 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
447 first_header_size, header_start, header_len) < 0) {
448 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
452 avio_w8(pb, 2); // number packets - 1
453 for (j = 0; j < 2; j++) {
454 put_xiph_size(pb, header_len[j]);
456 for (j = 0; j < 3; j++)
457 avio_write(pb, header_start[j], header_len[j]);
462 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
464 MPEG4AudioConfig mp4ac;
466 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
467 codec->extradata_size * 8, 1) < 0) {
468 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
472 *sample_rate = mp4ac.sample_rate;
473 *output_sample_rate = mp4ac.ext_sample_rate;
476 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
480 int ret, codecpriv_size;
482 ret = avio_open_dyn_buf(&dyn_cp);
487 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
488 ret = put_xiph_codecpriv(s, dyn_cp, codec);
489 else if (codec->codec_id == AV_CODEC_ID_FLAC)
490 ret = ff_flac_write_header(dyn_cp, codec, 1);
491 else if (codec->codec_id == AV_CODEC_ID_H264)
492 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
493 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
494 if (codec->extradata_size < 36) {
495 av_log(s, AV_LOG_ERROR,
496 "Invalid extradata found, ALAC expects a 36-byte "
498 ret = AVERROR_INVALIDDATA;
500 avio_write(dyn_cp, codec->extradata + 12,
501 codec->extradata_size - 12);
503 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
504 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
505 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
507 if (!codec->codec_tag)
508 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
509 if (codec->extradata_size)
510 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
512 if (!codec->codec_tag)
513 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
514 if (!codec->codec_tag) {
515 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
516 avcodec_get_name(codec->codec_id));
517 ret = AVERROR(EINVAL);
520 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
523 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
525 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
527 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
528 avcodec_get_name(codec->codec_id));
529 ret = AVERROR(EINVAL);
531 if (!codec->codec_tag)
532 codec->codec_tag = tag;
534 ff_put_wav_header(dyn_cp, codec);
537 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
539 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
544 static int mkv_write_tracks(AVFormatContext *s)
546 MatroskaMuxContext *mkv = s->priv_data;
547 AVIOContext *pb = s->pb;
549 int i, j, ret, default_stream_exists = 0;
551 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
552 if (ret < 0) return ret;
554 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
555 for (i = 0; i < s->nb_streams; i++) {
556 AVStream *st = s->streams[i];
557 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
559 for (i = 0; i < s->nb_streams; i++) {
560 AVStream *st = s->streams[i];
561 AVCodecContext *codec = st->codec;
562 ebml_master subinfo, track;
565 int bit_depth = av_get_bits_per_sample(codec->codec_id);
566 int sample_rate = codec->sample_rate;
567 int output_sample_rate = 0;
568 AVDictionaryEntry *tag;
570 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
571 mkv->have_attachments = 1;
576 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
578 bit_depth = codec->bits_per_coded_sample;
580 if (codec->codec_id == AV_CODEC_ID_AAC)
581 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
583 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
584 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
585 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
586 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
588 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
589 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
590 tag = av_dict_get(st->metadata, "language", NULL, 0);
591 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
593 if (default_stream_exists) {
594 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
596 if (st->disposition & AV_DISPOSITION_FORCED)
597 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
599 // look for a codec ID string specific to mkv to use,
600 // if none are found, use AVI codes
601 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
602 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
603 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
609 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
610 codec->codec_id == AV_CODEC_ID_VORBIS)) {
611 av_log(s, AV_LOG_ERROR,
612 "Only VP8 video and Vorbis audio are supported for WebM.\n");
613 return AVERROR(EINVAL);
616 switch (codec->codec_type) {
617 case AVMEDIA_TYPE_VIDEO:
618 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
619 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
620 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
622 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
625 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
626 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
627 || codec->codec_id == AV_CODEC_ID_SVQ1
628 || codec->codec_id == AV_CODEC_ID_SVQ3
629 || codec->codec_id == AV_CODEC_ID_CINEPAK))
633 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
634 else if (!native_id) {
635 // if there is no mkv-specific codec ID, use VFW mode
636 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
637 mkv->tracks[i].write_dts = 1;
640 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
641 // XXX: interlace flag?
642 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
643 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
645 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
646 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
647 // save stereo mode flag
648 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
650 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
651 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
656 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
657 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
658 av_log(s, AV_LOG_ERROR,
659 "The specified stereo mode is not valid.\n");
660 return AVERROR(EINVAL);
662 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
665 if (st->sample_aspect_ratio.num) {
666 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
667 if (d_width > INT_MAX) {
668 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
669 return AVERROR(EINVAL);
671 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
672 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
675 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
676 uint32_t color_space = av_le2ne32(codec->codec_tag);
677 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
679 end_ebml_master(pb, subinfo);
682 case AVMEDIA_TYPE_AUDIO:
683 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
686 // no mkv-specific ID, use ACM mode
687 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
689 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
690 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
691 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
692 if (output_sample_rate)
693 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
695 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
696 end_ebml_master(pb, subinfo);
699 case AVMEDIA_TYPE_SUBTITLE:
700 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
702 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
703 return AVERROR(ENOSYS);
707 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
708 return AVERROR(EINVAL);
710 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
711 if (ret < 0) return ret;
713 end_ebml_master(pb, track);
715 // ms precision is the de-facto standard timescale for mkv files
716 avpriv_set_pts_info(st, 64, 1, 1000);
718 end_ebml_master(pb, tracks);
722 static int mkv_write_chapters(AVFormatContext *s)
724 MatroskaMuxContext *mkv = s->priv_data;
725 AVIOContext *pb = s->pb;
726 ebml_master chapters, editionentry;
727 AVRational scale = {1, 1E9};
733 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
734 if (ret < 0) return ret;
736 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
737 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
738 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
739 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
740 for (i = 0; i < s->nb_chapters; i++) {
741 ebml_master chapteratom, chapterdisplay;
742 AVChapter *c = s->chapters[i];
743 AVDictionaryEntry *t = NULL;
745 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
746 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
747 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
748 av_rescale_q(c->start, c->time_base, scale));
749 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
750 av_rescale_q(c->end, c->time_base, scale));
751 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
752 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
753 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
754 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
755 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
756 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
757 end_ebml_master(pb, chapterdisplay);
759 end_ebml_master(pb, chapteratom);
761 end_ebml_master(pb, editionentry);
762 end_ebml_master(pb, chapters);
766 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
768 uint8_t *key = av_strdup(t->key);
770 const uint8_t *lang = NULL;
773 if ((p = strrchr(p, '-')) &&
774 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
781 else if (*p >= 'a' && *p <= 'z')
786 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
787 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
789 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
790 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
791 end_ebml_master(pb, tag);
796 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
797 unsigned int uid, ebml_master *tags)
799 MatroskaMuxContext *mkv = s->priv_data;
800 ebml_master tag, targets;
801 AVDictionaryEntry *t = NULL;
805 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
806 if (ret < 0) return ret;
808 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
811 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
812 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
814 put_ebml_uint(s->pb, elementid, uid);
815 end_ebml_master(s->pb, targets);
817 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
818 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
819 mkv_write_simpletag(s->pb, t);
821 end_ebml_master(s->pb, tag);
825 static int mkv_write_tags(AVFormatContext *s)
827 ebml_master tags = {0};
830 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
832 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
833 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
834 if (ret < 0) return ret;
837 for (i = 0; i < s->nb_streams; i++) {
838 AVStream *st = s->streams[i];
840 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
843 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
844 if (ret < 0) return ret;
847 for (i = 0; i < s->nb_chapters; i++) {
848 AVChapter *ch = s->chapters[i];
850 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
853 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
854 if (ret < 0) return ret;
858 end_ebml_master(s->pb, tags);
862 static int mkv_write_attachments(AVFormatContext *s)
864 MatroskaMuxContext *mkv = s->priv_data;
865 AVIOContext *pb = s->pb;
866 ebml_master attachments;
870 if (!mkv->have_attachments)
873 av_lfg_init(&c, av_get_random_seed());
875 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
876 if (ret < 0) return ret;
878 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
880 for (i = 0; i < s->nb_streams; i++) {
881 AVStream *st = s->streams[i];
882 ebml_master attached_file;
883 AVDictionaryEntry *t;
884 const char *mimetype = NULL;
887 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
890 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
892 if (t = av_dict_get(st->metadata, "title", NULL, 0))
893 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
894 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
895 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
896 return AVERROR(EINVAL);
898 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
899 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
901 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
903 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
904 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
905 mimetype = ff_mkv_mime_tags[i].str;
910 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
911 "it cannot be deduced from the codec id.\n", i);
912 return AVERROR(EINVAL);
915 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
916 struct AVSHA *sha = av_sha_alloc();
919 return AVERROR(ENOMEM);
920 av_sha_init(sha, 160);
921 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
922 av_sha_final(sha, digest);
924 fileuid = AV_RL64(digest);
926 fileuid = av_lfg_get(&c);
928 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
931 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
932 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
933 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
934 end_ebml_master(pb, attached_file);
936 end_ebml_master(pb, attachments);
941 static int mkv_write_header(AVFormatContext *s)
943 MatroskaMuxContext *mkv = s->priv_data;
944 AVIOContext *pb = s->pb;
945 ebml_master ebml_header, segment_info;
946 AVDictionaryEntry *tag;
949 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
950 else mkv->mode = MODE_MATROSKAv2;
952 if (s->avoid_negative_ts < 0)
953 s->avoid_negative_ts = 1;
955 for (i = 0; i < s->nb_streams; i++)
956 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
957 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
958 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
959 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
960 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
961 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
962 av_log(s, AV_LOG_ERROR,
963 "The Matroska muxer does not yet support muxing %s\n",
964 avcodec_get_name(s->streams[i]->codec->codec_id));
965 return AVERROR_PATCHWELCOME;
968 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
970 return AVERROR(ENOMEM);
972 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
973 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
974 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
975 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
976 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
977 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
978 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
979 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
980 end_ebml_master(pb, ebml_header);
982 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
983 mkv->segment_offset = avio_tell(pb);
985 // we write 2 seek heads - one at the end of the file to point to each
986 // cluster, and one at the beginning to point to all other level one
987 // elements (including the seek head at the end of the file), which
988 // isn't more than 10 elements if we only write one of each other
989 // currently defined level 1 element
990 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
991 if (!mkv->main_seekhead)
992 return AVERROR(ENOMEM);
994 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
995 if (ret < 0) return ret;
997 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
998 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
999 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1000 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1001 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1002 uint32_t segment_uid[4];
1005 av_lfg_init(&lfg, av_get_random_seed());
1007 for (i = 0; i < 4; i++)
1008 segment_uid[i] = av_lfg_get(&lfg);
1010 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1011 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1012 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1015 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1016 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1017 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1018 uint8_t date_utc_buf[8];
1019 AV_WB64(date_utc_buf, date_utc);
1020 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1023 // reserve space for the duration
1025 mkv->duration_offset = avio_tell(pb);
1026 put_ebml_void(pb, 11); // assumes double-precision float to be written
1027 end_ebml_master(pb, segment_info);
1029 ret = mkv_write_tracks(s);
1030 if (ret < 0) return ret;
1032 if (mkv->mode != MODE_WEBM) {
1033 ret = mkv_write_chapters(s);
1034 if (ret < 0) return ret;
1036 ret = mkv_write_tags(s);
1037 if (ret < 0) return ret;
1039 ret = mkv_write_attachments(s);
1040 if (ret < 0) return ret;
1043 if (!s->pb->seekable)
1044 mkv_write_seekhead(pb, mkv->main_seekhead);
1046 mkv->cues = mkv_start_cues(mkv->segment_offset);
1047 if (mkv->cues == NULL)
1048 return AVERROR(ENOMEM);
1050 if (pb->seekable && mkv->reserve_cues_space) {
1051 mkv->cues_pos = avio_tell(pb);
1052 put_ebml_void(pb, mkv->reserve_cues_space);
1055 av_init_packet(&mkv->cur_audio_pkt);
1056 mkv->cur_audio_pkt.size = 0;
1057 mkv->cluster_pos = -1;
1063 static int mkv_blockgroup_size(int pkt_size)
1065 int size = pkt_size + 4;
1066 size += ebml_num_size(size);
1067 size += 2; // EBML ID for block and block duration
1068 size += 8; // max size of block duration
1069 size += ebml_num_size(size);
1070 size += 1; // blockgroup EBML ID
1074 static int ass_get_duration(const uint8_t *p)
1076 int sh, sm, ss, sc, eh, em, es, ec;
1077 uint64_t start, end;
1079 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1080 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1082 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1083 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1088 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1090 MatroskaMuxContext *mkv = s->priv_data;
1091 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1092 uint8_t *start, *end, *data = pkt->data;
1093 ebml_master blockgroup;
1097 int duration = ass_get_duration(data);
1098 max_duration = FFMAX(duration, max_duration);
1099 end = memchr(data, '\n', data_size);
1100 size = line_size = end ? end-data+1 : data_size;
1101 size -= end ? (end[-1]=='\r')+1 : 0;
1103 for (i=0; i<3; i++, start++)
1104 if (!(start = memchr(start, ',', size-(start-data))))
1105 return max_duration;
1106 size -= start - data;
1107 sscanf(data, "Dialogue: %d,", &layer);
1108 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1109 s->streams[pkt->stream_index]->nb_frames, layer);
1110 size = FFMIN(i+size, sizeof(buffer));
1111 memcpy(buffer+i, start, size-i);
1113 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1114 "pts %" PRId64 ", duration %d\n",
1115 avio_tell(pb), size, pkt->pts, duration);
1116 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1117 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1118 put_ebml_num(pb, size+4, 0);
1119 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1120 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1122 avio_write(pb, buffer, size);
1123 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1124 end_ebml_master(pb, blockgroup);
1127 data_size -= line_size;
1130 return max_duration;
1134 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1135 unsigned int blockid, AVPacket *pkt, int flags)
1137 MatroskaMuxContext *mkv = s->priv_data;
1138 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1139 uint8_t *data = NULL;
1140 int offset = 0, size = pkt->size;
1141 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1143 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1144 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1145 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1146 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1147 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1148 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1152 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1153 /* Matroska specification requires to remove the first QuickTime atom
1159 put_ebml_id(pb, blockid);
1160 put_ebml_num(pb, size+4, 0);
1161 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1162 avio_wb16(pb, ts - mkv->cluster_pts);
1164 avio_write(pb, data + offset, size);
1165 if (data != pkt->data)
1169 static int srt_get_duration(uint8_t **buf)
1171 int i, duration = 0;
1173 for (i=0; i<2 && !duration; i++) {
1174 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1175 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1176 &s_hour, &s_min, &s_sec, &s_hsec,
1177 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1178 s_min += 60*s_hour; e_min += 60*e_hour;
1179 s_sec += 60*s_min; e_sec += 60*e_min;
1180 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1181 duration = e_hsec - s_hsec;
1183 *buf += strcspn(*buf, "\n") + 1;
1188 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1190 ebml_master blockgroup;
1191 AVPacket pkt2 = *pkt;
1192 int64_t duration = srt_get_duration(&pkt2.data);
1193 pkt2.size -= pkt2.data - pkt->data;
1195 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1196 mkv_blockgroup_size(pkt2.size));
1197 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1198 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1199 end_ebml_master(pb, blockgroup);
1204 static void mkv_flush_dynbuf(AVFormatContext *s)
1206 MatroskaMuxContext *mkv = s->priv_data;
1213 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1214 avio_write(s->pb, dyn_buf, bufsize);
1219 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1221 MatroskaMuxContext *mkv = s->priv_data;
1222 AVIOContext *pb = s->pb;
1223 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1224 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1225 int duration = pkt->duration;
1227 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1229 if (ts == AV_NOPTS_VALUE) {
1230 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1231 return AVERROR(EINVAL);
1234 if (!s->pb->seekable) {
1236 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1237 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1244 if (mkv->cluster_pos == -1) {
1245 mkv->cluster_pos = avio_tell(s->pb);
1246 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1247 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1248 mkv->cluster_pts = FFMAX(0, ts);
1251 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1252 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1254 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1255 duration = mkv_write_ass_blocks(s, pb, pkt);
1257 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1258 duration = mkv_write_srt_blocks(s, pb, pkt);
1260 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1261 /* For backward compatibility, prefer convergence_duration. */
1262 if (pkt->convergence_duration > 0) {
1263 duration = pkt->convergence_duration;
1265 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1266 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1267 end_ebml_master(pb, blockgroup);
1270 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1271 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1272 if (ret < 0) return ret;
1275 mkv->duration = FFMAX(mkv->duration, ts + duration);
1279 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1281 MatroskaMuxContext *mkv = s->priv_data;
1282 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1283 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1284 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1285 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1286 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1288 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1289 // after 4k and on a keyframe
1290 if (mkv->cluster_pos != -1 &&
1291 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1292 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1293 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1294 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1295 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1296 end_ebml_master(pb, mkv->cluster);
1297 mkv->cluster_pos = -1;
1299 mkv_flush_dynbuf(s);
1302 // check if we have an audio packet cached
1303 if (mkv->cur_audio_pkt.size > 0) {
1304 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1305 av_free_packet(&mkv->cur_audio_pkt);
1307 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1312 // buffer an audio packet to ensure the packet containing the video
1313 // keyframe's timecode is contained in the same cluster for WebM
1314 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1315 mkv->cur_audio_pkt = *pkt;
1316 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1317 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1319 ret = mkv_write_packet_internal(s, pkt);
1323 static int mkv_write_trailer(AVFormatContext *s)
1325 MatroskaMuxContext *mkv = s->priv_data;
1326 AVIOContext *pb = s->pb;
1327 int64_t currentpos, cuespos;
1330 // check if we have an audio packet cached
1331 if (mkv->cur_audio_pkt.size > 0) {
1332 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1333 av_free_packet(&mkv->cur_audio_pkt);
1335 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1341 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1342 mkv_flush_dynbuf(s);
1343 } else if (mkv->cluster_pos != -1) {
1344 end_ebml_master(pb, mkv->cluster);
1348 if (mkv->cues->num_entries) {
1349 if (mkv->reserve_cues_space) {
1352 currentpos = avio_tell(pb);
1353 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1355 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1356 cues_end = avio_tell(pb);
1357 if (cues_end > cuespos + mkv->reserve_cues_space) {
1358 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1359 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1360 cues_end - cuespos);
1361 return AVERROR(EINVAL);
1364 if (cues_end < cuespos + mkv->reserve_cues_space)
1365 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1367 avio_seek(pb, currentpos, SEEK_SET);
1369 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1372 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1373 if (ret < 0) return ret;
1376 mkv_write_seekhead(pb, mkv->main_seekhead);
1378 // update the duration
1379 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1380 currentpos = avio_tell(pb);
1381 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1382 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1384 avio_seek(pb, currentpos, SEEK_SET);
1387 end_ebml_master(pb, mkv->segment);
1388 av_free(mkv->tracks);
1389 av_freep(&mkv->cues->entries);
1390 av_freep(&mkv->cues);
1395 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1398 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1399 if (ff_mkv_codec_tags[i].id == codec_id)
1402 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1403 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1404 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1411 const AVCodecTag additional_audio_tags[] = {
1412 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1413 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1414 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1415 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1416 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1417 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1418 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1419 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1420 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1421 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1422 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1423 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1424 { AV_CODEC_ID_WAVPACK, 0xFFFFFFFF },
1425 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1428 const AVCodecTag additional_video_tags[] = {
1429 { AV_CODEC_ID_PRORES, 0xFFFFFFFF },
1430 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1431 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1432 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1433 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1434 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1435 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1438 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1439 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1440 static const AVOption options[] = {
1441 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning "
1442 "of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1446 #if CONFIG_MATROSKA_MUXER
1447 static const AVClass matroska_class = {
1448 .class_name = "matroska muxer",
1449 .item_name = av_default_item_name,
1451 .version = LIBAVUTIL_VERSION_INT,
1454 AVOutputFormat ff_matroska_muxer = {
1456 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1457 .mime_type = "video/x-matroska",
1458 .extensions = "mkv",
1459 .priv_data_size = sizeof(MatroskaMuxContext),
1460 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1461 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1462 .video_codec = CONFIG_LIBX264_ENCODER ?
1463 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1464 .write_header = mkv_write_header,
1465 .write_packet = mkv_write_packet,
1466 .write_trailer = mkv_write_trailer,
1467 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1469 .codec_tag = (const AVCodecTag* const []){
1470 ff_codec_bmp_tags, ff_codec_wav_tags,
1471 additional_audio_tags, additional_video_tags, 0
1474 .subtitle_codec = AV_CODEC_ID_SSA,
1476 .subtitle_codec = AV_CODEC_ID_ASS,
1478 .query_codec = mkv_query_codec,
1479 .priv_class = &matroska_class,
1483 #if CONFIG_WEBM_MUXER
1484 static const AVClass webm_class = {
1485 .class_name = "webm muxer",
1486 .item_name = av_default_item_name,
1488 .version = LIBAVUTIL_VERSION_INT,
1491 AVOutputFormat ff_webm_muxer = {
1493 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1494 .mime_type = "video/webm",
1495 .extensions = "webm",
1496 .priv_data_size = sizeof(MatroskaMuxContext),
1497 .audio_codec = AV_CODEC_ID_VORBIS,
1498 .video_codec = AV_CODEC_ID_VP8,
1499 .write_header = mkv_write_header,
1500 .write_packet = mkv_write_packet,
1501 .write_trailer = mkv_write_trailer,
1502 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1504 .priv_class = &webm_class,
1508 #if CONFIG_MATROSKA_AUDIO_MUXER
1509 static const AVClass mka_class = {
1510 .class_name = "matroska audio muxer",
1511 .item_name = av_default_item_name,
1513 .version = LIBAVUTIL_VERSION_INT,
1515 AVOutputFormat ff_matroska_audio_muxer = {
1517 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1518 .mime_type = "audio/x-matroska",
1519 .extensions = "mka",
1520 .priv_data_size = sizeof(MatroskaMuxContext),
1521 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1522 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1523 .video_codec = AV_CODEC_ID_NONE,
1524 .write_header = mkv_write_header,
1525 .write_packet = mkv_write_packet,
1526 .write_trailer = mkv_write_trailer,
1527 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
1528 .codec_tag = (const AVCodecTag* const []){
1529 ff_codec_wav_tags, additional_audio_tags, 0
1531 .priv_class = &mka_class,