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
29 #include "avlanguage.h"
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/sha.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/intfloat.h"
34 #include "libavutil/mathematics.h"
35 #include "libavutil/random_seed.h"
36 #include "libavutil/lfg.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/avstring.h"
39 #include "libavcodec/xiph.h"
40 #include "libavcodec/mpeg4audio.h"
42 typedef struct ebml_master {
43 int64_t pos; ///< absolute offset in the file where the master's elements start
44 int sizebytes; ///< how many bytes were reserved for the size
47 typedef struct mkv_seekhead_entry {
48 unsigned int elementid;
52 typedef struct mkv_seekhead {
54 int64_t segment_offset; ///< the file offset to the beginning of the segment
55 int reserved_size; ///< -1 if appending to file
57 mkv_seekhead_entry *entries;
64 int64_t cluster_pos; ///< file offset of the cluster containing the block
68 int64_t segment_offset;
69 mkv_cuepoint *entries;
78 #define MODE_MATROSKAv2 0x01
79 #define MODE_WEBM 0x02
81 typedef struct MatroskaMuxContext {
85 int64_t segment_offset;
87 int64_t cluster_pos; ///< file offset of the current cluster
89 int64_t duration_offset;
91 mkv_seekhead *main_seekhead;
95 unsigned int audio_buffer_size;
96 AVPacket cur_audio_pkt;
102 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
103 * offset, 4 bytes for target EBML ID */
104 #define MAX_SEEKENTRY_SIZE 21
106 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
108 #define MAX_CUETRACKPOS_SIZE 22
110 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
111 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
114 static int ebml_id_size(unsigned int id)
116 return (av_log2(id+1)-1)/7+1;
119 static void put_ebml_id(AVIOContext *pb, unsigned int id)
121 int i = ebml_id_size(id);
123 avio_w8(pb, (uint8_t)(id >> (i*8)));
127 * Write an EBML size meaning "unknown size".
129 * @param bytes The number of bytes the size should occupy (maximum: 8).
131 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
133 av_assert0(bytes <= 8);
134 avio_w8(pb, 0x1ff >> bytes);
140 * Calculate how many bytes are needed to represent a given number in EBML.
142 static int ebml_num_size(uint64_t num)
145 while ((num+1) >> bytes*7) bytes++;
150 * Write a number in EBML variable length format.
152 * @param bytes The number of bytes that need to be used to write the number.
153 * If zero, any number of bytes can be used.
155 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
157 int i, needed_bytes = ebml_num_size(num);
159 // sizes larger than this are currently undefined in EBML
160 av_assert0(num < (1ULL<<56)-1);
163 // don't care how many bytes are used, so use the min
164 bytes = needed_bytes;
165 // the bytes needed to write the given size would exceed the bytes
166 // that we need to use, so write unknown size. This shouldn't happen.
167 av_assert0(bytes >= needed_bytes);
169 num |= 1ULL << bytes*7;
170 for (i = bytes - 1; i >= 0; i--)
171 avio_w8(pb, (uint8_t)(num >> i*8));
174 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
178 while (tmp>>=8) bytes++;
180 put_ebml_id(pb, elementid);
181 put_ebml_num(pb, bytes, 0);
182 for (i = bytes - 1; i >= 0; i--)
183 avio_w8(pb, (uint8_t)(val >> i*8));
186 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
188 put_ebml_id(pb, elementid);
189 put_ebml_num(pb, 8, 0);
190 avio_wb64(pb, av_double2int(val));
193 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
194 const void *buf, int size)
196 put_ebml_id(pb, elementid);
197 put_ebml_num(pb, size, 0);
198 avio_write(pb, buf, size);
201 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
203 put_ebml_binary(pb, elementid, str, strlen(str));
207 * Write a void element of a given size. Useful for reserving space in
208 * the file to be written to later.
210 * @param size The number of bytes to reserve, which must be at least 2.
212 static void put_ebml_void(AVIOContext *pb, uint64_t size)
214 int64_t currentpos = avio_tell(pb);
216 av_assert0(size >= 2);
218 put_ebml_id(pb, EBML_ID_VOID);
219 // we need to subtract the length needed to store the size from the
220 // size we need to reserve so 2 cases, we use 8 bytes to store the
221 // size if possible, 1 byte otherwise
223 put_ebml_num(pb, size-1, 0);
225 put_ebml_num(pb, size-9, 8);
226 while(avio_tell(pb) < currentpos + size)
230 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
232 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
233 put_ebml_id(pb, elementid);
234 put_ebml_size_unknown(pb, bytes);
235 return (ebml_master){ avio_tell(pb), bytes };
238 static void end_ebml_master(AVIOContext *pb, ebml_master master)
240 int64_t pos = avio_tell(pb);
242 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
244 put_ebml_num(pb, pos - master.pos, master.sizebytes);
245 avio_seek(pb, pos, SEEK_SET);
248 static void put_xiph_size(AVIOContext *pb, int size)
251 for (i = 0; i < size / 255; i++)
253 avio_w8(pb, size % 255);
257 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
258 * elements. If a maximum number of elements is specified, enough space
259 * will be reserved at the current file location to write a seek head of
262 * @param segment_offset The absolute offset to the position in the file
263 * where the segment begins.
264 * @param numelements The maximum number of elements that will be indexed
265 * by this seek head, 0 if unlimited.
267 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
269 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
270 if (new_seekhead == NULL)
273 new_seekhead->segment_offset = segment_offset;
275 if (numelements > 0) {
276 new_seekhead->filepos = avio_tell(pb);
277 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
278 // and size, and 3 bytes to guarantee that an EBML void element
279 // will fit afterwards
280 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
281 new_seekhead->max_entries = numelements;
282 put_ebml_void(pb, new_seekhead->reserved_size);
287 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
289 mkv_seekhead_entry *entries = seekhead->entries;
291 // don't store more elements than we reserved space for
292 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
295 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
297 return AVERROR(ENOMEM);
299 entries[seekhead->num_entries ].elementid = elementid;
300 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
302 seekhead->entries = entries;
307 * Write the seek head to the file and free it. If a maximum number of
308 * elements was specified to mkv_start_seekhead(), the seek head will
309 * be written at the location reserved for it. Otherwise, it is written
310 * at the current location in the file.
312 * @return The file offset where the seekhead was written,
313 * -1 if an error occurred.
315 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
317 ebml_master metaseek, seekentry;
321 currentpos = avio_tell(pb);
323 if (seekhead->reserved_size > 0) {
324 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
330 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
331 for (i = 0; i < seekhead->num_entries; i++) {
332 mkv_seekhead_entry *entry = &seekhead->entries[i];
334 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
336 put_ebml_id(pb, MATROSKA_ID_SEEKID);
337 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
338 put_ebml_id(pb, entry->elementid);
340 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
341 end_ebml_master(pb, seekentry);
343 end_ebml_master(pb, metaseek);
345 if (seekhead->reserved_size > 0) {
346 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
347 put_ebml_void(pb, remaining);
348 avio_seek(pb, currentpos, SEEK_SET);
350 currentpos = seekhead->filepos;
353 av_free(seekhead->entries);
359 static mkv_cues * mkv_start_cues(int64_t segment_offset)
361 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
365 cues->segment_offset = segment_offset;
369 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
371 mkv_cuepoint *entries = cues->entries;
376 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
378 return AVERROR(ENOMEM);
380 entries[cues->num_entries ].pts = ts;
381 entries[cues->num_entries ].tracknum = stream + 1;
382 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
384 cues->entries = entries;
388 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
390 ebml_master cues_element;
394 currentpos = avio_tell(pb);
395 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
397 for (i = 0; i < cues->num_entries; i++) {
398 ebml_master cuepoint, track_positions;
399 mkv_cuepoint *entry = &cues->entries[i];
400 uint64_t pts = entry->pts;
402 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
403 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
405 // put all the entries from different tracks that have the exact same
406 // timestamp into the same CuePoint
407 for (j = 0; j < num_tracks; j++)
408 tracks[j].has_cue = 0;
409 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
410 int tracknum = entry[j].tracknum - 1;
411 av_assert0(tracknum>=0 && tracknum<num_tracks);
412 if (tracks[tracknum].has_cue)
414 tracks[tracknum].has_cue = 1;
415 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
416 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
417 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
418 end_ebml_master(pb, track_positions);
421 end_ebml_master(pb, cuepoint);
423 end_ebml_master(pb, cues_element);
428 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
430 uint8_t *header_start[3];
432 int first_header_size;
435 if (codec->codec_id == AV_CODEC_ID_VORBIS)
436 first_header_size = 30;
438 first_header_size = 42;
440 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
441 first_header_size, header_start, header_len) < 0) {
442 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
446 avio_w8(pb, 2); // number packets - 1
447 for (j = 0; j < 2; j++) {
448 put_xiph_size(pb, header_len[j]);
450 for (j = 0; j < 3; j++)
451 avio_write(pb, header_start[j], header_len[j]);
456 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
458 MPEG4AudioConfig mp4ac;
460 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
461 codec->extradata_size * 8, 1) < 0) {
462 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
466 *sample_rate = mp4ac.sample_rate;
467 *output_sample_rate = mp4ac.ext_sample_rate;
470 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
474 int ret, codecpriv_size;
476 ret = avio_open_dyn_buf(&dyn_cp);
481 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
482 ret = put_xiph_codecpriv(s, dyn_cp, codec);
483 else if (codec->codec_id == AV_CODEC_ID_FLAC)
484 ret = ff_flac_write_header(dyn_cp, codec, 1);
485 else if (codec->codec_id == AV_CODEC_ID_H264)
486 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
487 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
488 if (codec->extradata_size < 36) {
489 av_log(s, AV_LOG_ERROR,
490 "Invalid extradata found, ALAC expects a 36-byte "
492 ret = AVERROR_INVALIDDATA;
494 avio_write(dyn_cp, codec->extradata + 12,
495 codec->extradata_size - 12);
497 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
498 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
499 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
501 if (!codec->codec_tag)
502 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
503 if (codec->extradata_size)
504 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
506 if (!codec->codec_tag)
507 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
508 if (!codec->codec_tag) {
509 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
510 avcodec_get_name(codec->codec_id));
511 ret = AVERROR(EINVAL);
514 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
517 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
519 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
521 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
522 avcodec_get_name(codec->codec_id));
523 ret = AVERROR(EINVAL);
525 if (!codec->codec_tag)
526 codec->codec_tag = tag;
528 ff_put_wav_header(dyn_cp, codec);
531 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
533 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
538 static int mkv_write_tracks(AVFormatContext *s)
540 MatroskaMuxContext *mkv = s->priv_data;
541 AVIOContext *pb = s->pb;
543 int i, j, ret, default_stream_exists = 0;
545 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
546 if (ret < 0) return ret;
548 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
549 for (i = 0; i < s->nb_streams; i++) {
550 AVStream *st = s->streams[i];
551 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
553 for (i = 0; i < s->nb_streams; i++) {
554 AVStream *st = s->streams[i];
555 AVCodecContext *codec = st->codec;
556 ebml_master subinfo, track;
559 int bit_depth = av_get_bits_per_sample(codec->codec_id);
560 int sample_rate = codec->sample_rate;
561 int output_sample_rate = 0;
562 AVDictionaryEntry *tag;
564 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
565 mkv->have_attachments = 1;
570 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
572 bit_depth = codec->bits_per_coded_sample;
574 if (codec->codec_id == AV_CODEC_ID_AAC)
575 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
577 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
578 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
579 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
580 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
582 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
583 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
584 tag = av_dict_get(st->metadata, "language", NULL, 0);
585 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
587 if (default_stream_exists) {
588 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
590 if (st->disposition & AV_DISPOSITION_FORCED)
591 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
593 // look for a codec ID string specific to mkv to use,
594 // if none are found, use AVI codes
595 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
596 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
597 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
603 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
604 codec->codec_id == AV_CODEC_ID_VORBIS)) {
605 av_log(s, AV_LOG_ERROR,
606 "Only VP8 video and Vorbis audio are supported for WebM.\n");
607 return AVERROR(EINVAL);
610 switch (codec->codec_type) {
611 case AVMEDIA_TYPE_VIDEO:
612 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
613 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
614 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
616 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
619 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
620 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
621 || codec->codec_id == AV_CODEC_ID_SVQ1
622 || codec->codec_id == AV_CODEC_ID_SVQ3
623 || codec->codec_id == AV_CODEC_ID_CINEPAK))
627 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
628 else if (!native_id) {
629 // if there is no mkv-specific codec ID, use VFW mode
630 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
631 mkv->tracks[i].write_dts = 1;
634 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
635 // XXX: interlace flag?
636 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
637 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
639 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
640 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
641 // save stereo mode flag
642 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
644 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
645 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
650 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
651 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
652 av_log(s, AV_LOG_ERROR,
653 "The specified stereo mode is not valid.\n");
654 return AVERROR(EINVAL);
656 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
659 if (st->sample_aspect_ratio.num) {
660 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
661 if (d_width > INT_MAX) {
662 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
663 return AVERROR(EINVAL);
665 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
666 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
669 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
670 uint32_t color_space = av_le2ne32(codec->codec_tag);
671 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
673 end_ebml_master(pb, subinfo);
676 case AVMEDIA_TYPE_AUDIO:
677 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
680 // no mkv-specific ID, use ACM mode
681 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
683 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
684 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
685 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
686 if (output_sample_rate)
687 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
689 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
690 end_ebml_master(pb, subinfo);
693 case AVMEDIA_TYPE_SUBTITLE:
694 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
696 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
697 return AVERROR(ENOSYS);
701 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
704 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
705 if (ret < 0) return ret;
707 end_ebml_master(pb, track);
709 // ms precision is the de-facto standard timescale for mkv files
710 avpriv_set_pts_info(st, 64, 1, 1000);
712 end_ebml_master(pb, tracks);
716 static int mkv_write_chapters(AVFormatContext *s)
718 MatroskaMuxContext *mkv = s->priv_data;
719 AVIOContext *pb = s->pb;
720 ebml_master chapters, editionentry;
721 AVRational scale = {1, 1E9};
727 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
728 if (ret < 0) return ret;
730 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
731 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
732 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
733 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
734 for (i = 0; i < s->nb_chapters; i++) {
735 ebml_master chapteratom, chapterdisplay;
736 AVChapter *c = s->chapters[i];
737 AVDictionaryEntry *t = NULL;
739 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
740 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
741 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
742 av_rescale_q(c->start, c->time_base, scale));
743 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
744 av_rescale_q(c->end, c->time_base, scale));
745 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
746 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
747 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
748 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
749 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
750 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
751 end_ebml_master(pb, chapterdisplay);
753 end_ebml_master(pb, chapteratom);
755 end_ebml_master(pb, editionentry);
756 end_ebml_master(pb, chapters);
760 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
762 uint8_t *key = av_strdup(t->key);
764 const uint8_t *lang = NULL;
767 if ((p = strrchr(p, '-')) &&
768 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
775 else if (*p >= 'a' && *p <= 'z')
780 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
781 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
783 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
784 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
785 end_ebml_master(pb, tag);
790 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
791 unsigned int uid, ebml_master *tags)
793 MatroskaMuxContext *mkv = s->priv_data;
794 ebml_master tag, targets;
795 AVDictionaryEntry *t = NULL;
799 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
800 if (ret < 0) return ret;
802 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
805 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
806 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
808 put_ebml_uint(s->pb, elementid, uid);
809 end_ebml_master(s->pb, targets);
811 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
812 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
813 mkv_write_simpletag(s->pb, t);
815 end_ebml_master(s->pb, tag);
819 static int mkv_write_tags(AVFormatContext *s)
821 ebml_master tags = {0};
824 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
826 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
827 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
828 if (ret < 0) return ret;
831 for (i = 0; i < s->nb_streams; i++) {
832 AVStream *st = s->streams[i];
834 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
837 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
838 if (ret < 0) return ret;
841 for (i = 0; i < s->nb_chapters; i++) {
842 AVChapter *ch = s->chapters[i];
844 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
847 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
848 if (ret < 0) return ret;
852 end_ebml_master(s->pb, tags);
856 static int mkv_write_attachments(AVFormatContext *s)
858 MatroskaMuxContext *mkv = s->priv_data;
859 AVIOContext *pb = s->pb;
860 ebml_master attachments;
864 if (!mkv->have_attachments)
867 av_lfg_init(&c, av_get_random_seed());
869 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
870 if (ret < 0) return ret;
872 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
874 for (i = 0; i < s->nb_streams; i++) {
875 AVStream *st = s->streams[i];
876 ebml_master attached_file;
877 AVDictionaryEntry *t;
878 const char *mimetype = NULL;
881 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
884 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
886 if (t = av_dict_get(st->metadata, "title", NULL, 0))
887 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
888 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
889 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
890 return AVERROR(EINVAL);
892 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
893 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
895 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
897 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
898 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
899 mimetype = ff_mkv_mime_tags[i].str;
904 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
905 "it cannot be deduced from the codec id.\n", i);
906 return AVERROR(EINVAL);
909 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
910 struct AVSHA *sha = av_sha_alloc();
913 return AVERROR(ENOMEM);
914 av_sha_init(sha, 160);
915 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
916 av_sha_final(sha, digest);
918 fileuid = AV_RL64(digest);
920 fileuid = av_lfg_get(&c);
922 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
925 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
926 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
927 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
928 end_ebml_master(pb, attached_file);
930 end_ebml_master(pb, attachments);
935 static int mkv_write_header(AVFormatContext *s)
937 MatroskaMuxContext *mkv = s->priv_data;
938 AVIOContext *pb = s->pb;
939 ebml_master ebml_header, segment_info;
940 AVDictionaryEntry *tag;
943 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
944 else mkv->mode = MODE_MATROSKAv2;
946 if (s->avoid_negative_ts < 0)
947 s->avoid_negative_ts = 1;
949 for (i = 0; i < s->nb_streams; i++)
950 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
951 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
952 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
953 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
954 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
955 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
956 av_log(s, AV_LOG_ERROR,
957 "The Matroska muxer does not yet support muxing %s\n",
958 avcodec_get_name(s->streams[i]->codec->codec_id));
959 return AVERROR_PATCHWELCOME;
962 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
964 return AVERROR(ENOMEM);
966 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
967 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
968 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
969 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
970 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
971 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
972 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
973 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
974 end_ebml_master(pb, ebml_header);
976 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
977 mkv->segment_offset = avio_tell(pb);
979 // we write 2 seek heads - one at the end of the file to point to each
980 // cluster, and one at the beginning to point to all other level one
981 // elements (including the seek head at the end of the file), which
982 // isn't more than 10 elements if we only write one of each other
983 // currently defined level 1 element
984 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
985 if (!mkv->main_seekhead)
986 return AVERROR(ENOMEM);
988 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
989 if (ret < 0) return ret;
991 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
992 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
993 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
994 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
995 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
996 uint32_t segment_uid[4];
999 av_lfg_init(&lfg, av_get_random_seed());
1001 for (i = 0; i < 4; i++)
1002 segment_uid[i] = av_lfg_get(&lfg);
1004 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1005 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1006 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1009 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1010 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1011 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1012 uint8_t date_utc_buf[8];
1013 AV_WB64(date_utc_buf, date_utc);
1014 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1017 // reserve space for the duration
1019 mkv->duration_offset = avio_tell(pb);
1020 put_ebml_void(pb, 11); // assumes double-precision float to be written
1021 end_ebml_master(pb, segment_info);
1023 ret = mkv_write_tracks(s);
1024 if (ret < 0) return ret;
1026 if (mkv->mode != MODE_WEBM) {
1027 ret = mkv_write_chapters(s);
1028 if (ret < 0) return ret;
1030 ret = mkv_write_tags(s);
1031 if (ret < 0) return ret;
1033 ret = mkv_write_attachments(s);
1034 if (ret < 0) return ret;
1037 if (!s->pb->seekable)
1038 mkv_write_seekhead(pb, mkv->main_seekhead);
1040 mkv->cues = mkv_start_cues(mkv->segment_offset);
1041 if (mkv->cues == NULL)
1042 return AVERROR(ENOMEM);
1044 av_init_packet(&mkv->cur_audio_pkt);
1045 mkv->cur_audio_pkt.size = 0;
1046 mkv->audio_buffer_size = 0;
1047 mkv->cluster_pos = -1;
1053 static int mkv_blockgroup_size(int pkt_size)
1055 int size = pkt_size + 4;
1056 size += ebml_num_size(size);
1057 size += 2; // EBML ID for block and block duration
1058 size += 8; // max size of block duration
1059 size += ebml_num_size(size);
1060 size += 1; // blockgroup EBML ID
1064 static int ass_get_duration(const uint8_t *p)
1066 int sh, sm, ss, sc, eh, em, es, ec;
1067 uint64_t start, end;
1069 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1070 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1072 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1073 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1077 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1079 MatroskaMuxContext *mkv = s->priv_data;
1080 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1081 uint8_t *start, *end, *data = pkt->data;
1082 ebml_master blockgroup;
1086 int duration = ass_get_duration(data);
1087 max_duration = FFMAX(duration, max_duration);
1088 end = memchr(data, '\n', data_size);
1089 size = line_size = end ? end-data+1 : data_size;
1090 size -= end ? (end[-1]=='\r')+1 : 0;
1092 for (i=0; i<3; i++, start++)
1093 if (!(start = memchr(start, ',', size-(start-data))))
1094 return max_duration;
1095 size -= start - data;
1096 sscanf(data, "Dialogue: %d,", &layer);
1097 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1098 s->streams[pkt->stream_index]->nb_frames, layer);
1099 size = FFMIN(i+size, sizeof(buffer));
1100 memcpy(buffer+i, start, size-i);
1102 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1103 "pts %" PRId64 ", duration %d\n",
1104 avio_tell(pb), size, pkt->pts, duration);
1105 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1106 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1107 put_ebml_num(pb, size+4, 0);
1108 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1109 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1111 avio_write(pb, buffer, size);
1112 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1113 end_ebml_master(pb, blockgroup);
1116 data_size -= line_size;
1119 return max_duration;
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);
1140 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1141 /* Matroska specification requires to remove the first QuickTime atom
1147 put_ebml_id(pb, blockid);
1148 put_ebml_num(pb, size+4, 0);
1149 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1150 avio_wb16(pb, ts - mkv->cluster_pts);
1152 avio_write(pb, data + offset, size);
1153 if (data != pkt->data)
1157 static int srt_get_duration(uint8_t **buf)
1159 int i, duration = 0;
1161 for (i=0; i<2 && !duration; i++) {
1162 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1163 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1164 &s_hour, &s_min, &s_sec, &s_hsec,
1165 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1166 s_min += 60*s_hour; e_min += 60*e_hour;
1167 s_sec += 60*s_min; e_sec += 60*e_min;
1168 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1169 duration = e_hsec - s_hsec;
1171 *buf += strcspn(*buf, "\n") + 1;
1176 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1178 ebml_master blockgroup;
1179 AVPacket pkt2 = *pkt;
1180 int64_t duration = srt_get_duration(&pkt2.data);
1181 pkt2.size -= pkt2.data - pkt->data;
1183 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1184 mkv_blockgroup_size(pkt2.size));
1185 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1186 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1187 end_ebml_master(pb, blockgroup);
1192 static void mkv_flush_dynbuf(AVFormatContext *s)
1194 MatroskaMuxContext *mkv = s->priv_data;
1201 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1202 avio_write(s->pb, dyn_buf, bufsize);
1207 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1209 MatroskaMuxContext *mkv = s->priv_data;
1210 AVIOContext *pb = s->pb;
1211 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1212 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1213 int duration = pkt->duration;
1215 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1217 if (ts == AV_NOPTS_VALUE) {
1218 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1219 return AVERROR(EINVAL);
1222 if (!s->pb->seekable) {
1224 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1225 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1232 if (mkv->cluster_pos == -1) {
1233 mkv->cluster_pos = avio_tell(s->pb);
1234 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1235 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1236 mkv->cluster_pts = FFMAX(0, ts);
1239 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1240 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1241 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1242 duration = mkv_write_ass_blocks(s, pb, pkt);
1243 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1244 duration = mkv_write_srt_blocks(s, pb, pkt);
1246 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1247 /* For backward compatibility, prefer convergence_duration. */
1248 if (pkt->convergence_duration > 0) {
1249 duration = pkt->convergence_duration;
1251 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1252 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1253 end_ebml_master(pb, blockgroup);
1256 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1257 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1258 if (ret < 0) return ret;
1261 mkv->duration = FFMAX(mkv->duration, ts + duration);
1265 static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
1267 uint8_t *data = mkv->cur_audio_pkt.data;
1268 mkv->cur_audio_pkt = *pkt;
1269 mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
1270 if (!mkv->cur_audio_pkt.data)
1271 return AVERROR(ENOMEM);
1273 memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
1274 mkv->cur_audio_pkt.size = pkt->size;
1278 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1280 MatroskaMuxContext *mkv = s->priv_data;
1281 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1282 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1283 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1284 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1285 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1287 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1288 // after 4k and on a keyframe
1289 if (mkv->cluster_pos != -1 &&
1290 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1291 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1292 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1293 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1294 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1295 end_ebml_master(pb, mkv->cluster);
1296 mkv->cluster_pos = -1;
1298 mkv_flush_dynbuf(s);
1301 // check if we have an audio packet cached
1302 if (mkv->cur_audio_pkt.size > 0) {
1303 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1304 mkv->cur_audio_pkt.size = 0;
1306 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1311 // buffer an audio packet to ensure the packet containing the video
1312 // keyframe's timecode is contained in the same cluster for WebM
1313 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
1314 ret = mkv_copy_packet(mkv, pkt);
1316 ret = mkv_write_packet_internal(s, pkt);
1320 static int mkv_write_trailer(AVFormatContext *s)
1322 MatroskaMuxContext *mkv = s->priv_data;
1323 AVIOContext *pb = s->pb;
1324 int64_t currentpos, cuespos;
1327 // check if we have an audio packet cached
1328 if (mkv->cur_audio_pkt.size > 0) {
1329 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1330 mkv->cur_audio_pkt.size = 0;
1332 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1338 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1339 mkv_flush_dynbuf(s);
1340 } else if (mkv->cluster_pos != -1) {
1341 end_ebml_master(pb, mkv->cluster);
1345 if (mkv->cues->num_entries) {
1346 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1348 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1349 if (ret < 0) return ret;
1352 mkv_write_seekhead(pb, mkv->main_seekhead);
1354 // update the duration
1355 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1356 currentpos = avio_tell(pb);
1357 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1358 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1360 avio_seek(pb, currentpos, SEEK_SET);
1363 end_ebml_master(pb, mkv->segment);
1364 av_free(mkv->tracks);
1365 av_freep(&mkv->cues->entries);
1366 av_freep(&mkv->cues);
1367 av_destruct_packet(&mkv->cur_audio_pkt);
1372 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1375 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1376 if (ff_mkv_codec_tags[i].id == codec_id)
1379 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1380 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1381 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1388 const AVCodecTag additional_audio_tags[] = {
1389 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1390 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1391 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1392 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1393 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1394 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1395 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1396 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1397 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1398 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1399 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1400 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1401 { AV_CODEC_ID_WAVPACK, 0xFFFFFFFF },
1402 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1405 const AVCodecTag additional_video_tags[] = {
1406 { AV_CODEC_ID_PRORES, 0xFFFFFFFF },
1407 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1408 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1409 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1410 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1411 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1412 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1415 #if CONFIG_MATROSKA_MUXER
1416 AVOutputFormat ff_matroska_muxer = {
1418 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1419 .mime_type = "video/x-matroska",
1420 .extensions = "mkv",
1421 .priv_data_size = sizeof(MatroskaMuxContext),
1422 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1423 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1424 .video_codec = CONFIG_LIBX264_ENCODER ?
1425 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1426 .write_header = mkv_write_header,
1427 .write_packet = mkv_write_packet,
1428 .write_trailer = mkv_write_trailer,
1429 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1431 .codec_tag = (const AVCodecTag* const []){
1432 ff_codec_bmp_tags, ff_codec_wav_tags,
1433 additional_audio_tags, additional_video_tags, 0
1435 .subtitle_codec = AV_CODEC_ID_SSA,
1436 .query_codec = mkv_query_codec,
1440 #if CONFIG_WEBM_MUXER
1441 AVOutputFormat ff_webm_muxer = {
1443 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1444 .mime_type = "video/webm",
1445 .extensions = "webm",
1446 .priv_data_size = sizeof(MatroskaMuxContext),
1447 .audio_codec = AV_CODEC_ID_VORBIS,
1448 .video_codec = AV_CODEC_ID_VP8,
1449 .write_header = mkv_write_header,
1450 .write_packet = mkv_write_packet,
1451 .write_trailer = mkv_write_trailer,
1452 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1457 #if CONFIG_MATROSKA_AUDIO_MUXER
1458 AVOutputFormat ff_matroska_audio_muxer = {
1460 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1461 .mime_type = "audio/x-matroska",
1462 .extensions = "mka",
1463 .priv_data_size = sizeof(MatroskaMuxContext),
1464 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1465 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1466 .video_codec = AV_CODEC_ID_NONE,
1467 .write_header = mkv_write_header,
1468 .write_packet = mkv_write_packet,
1469 .write_trailer = mkv_write_trailer,
1470 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
1471 .codec_tag = (const AVCodecTag* const []){
1472 ff_codec_wav_tags, additional_audio_tags, 0