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
27 #include "avio_internal.h"
28 #include "avlanguage.h"
34 #include "subtitles.h"
35 #include "vorbiscomment.h"
38 #include "libavutil/avstring.h"
39 #include "libavutil/channel_layout.h"
40 #include "libavutil/dict.h"
41 #include "libavutil/intfloat.h"
42 #include "libavutil/intreadwrite.h"
43 #include "libavutil/lfg.h"
44 #include "libavutil/mathematics.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/random_seed.h"
47 #include "libavutil/rational.h"
48 #include "libavutil/samplefmt.h"
49 #include "libavutil/sha.h"
50 #include "libavutil/stereo3d.h"
52 #include "libavcodec/xiph.h"
53 #include "libavcodec/mpeg4audio.h"
54 #include "libavcodec/internal.h"
56 typedef struct ebml_master {
57 int64_t pos; ///< absolute offset in the file where the master's elements start
58 int sizebytes; ///< how many bytes were reserved for the size
61 typedef struct mkv_seekhead_entry {
62 unsigned int elementid;
66 typedef struct mkv_seekhead {
68 int64_t segment_offset; ///< the file offset to the beginning of the segment
69 int reserved_size; ///< -1 if appending to file
71 mkv_seekhead_entry *entries;
75 typedef struct mkv_cuepoint {
79 int64_t cluster_pos; ///< file offset of the cluster containing the block
80 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
81 int64_t duration; ///< duration of the block according to time base
84 typedef struct mkv_cues {
85 int64_t segment_offset;
86 mkv_cuepoint *entries;
90 typedef struct mkv_track {
96 #define MODE_MATROSKAv2 0x01
97 #define MODE_WEBM 0x02
99 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
100 * range 1 to 126 (inclusive) */
101 #define MAX_TRACKS 126
103 typedef struct MatroskaMuxContext {
104 const AVClass *class;
108 int64_t segment_offset;
110 int64_t cluster_pos; ///< file offset of the current cluster
112 int64_t duration_offset;
114 mkv_seekhead *main_seekhead;
118 AVPacket cur_audio_pkt;
120 int have_attachments;
122 int reserve_cues_space;
123 int cluster_size_limit;
125 int64_t cluster_time_limit;
127 int dash_track_number;
130 uint32_t chapter_id_offset;
133 int64_t last_track_timestamp[MAX_TRACKS];
135 int64_t* stream_durations;
136 int64_t* stream_duration_offsets;
139 } MatroskaMuxContext;
142 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
143 * offset, 4 bytes for target EBML ID */
144 #define MAX_SEEKENTRY_SIZE 21
146 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
148 #define MAX_CUETRACKPOS_SIZE 42
150 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
151 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
153 /** Seek preroll value for opus */
154 #define OPUS_SEEK_PREROLL 80000000
156 static int ebml_id_size(unsigned int id)
158 return (av_log2(id + 1) - 1) / 7 + 1;
161 static void put_ebml_id(AVIOContext *pb, unsigned int id)
163 int i = ebml_id_size(id);
165 avio_w8(pb, (uint8_t)(id >> (i * 8)));
169 * Write an EBML size meaning "unknown size".
171 * @param bytes The number of bytes the size should occupy (maximum: 8).
173 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
175 av_assert0(bytes <= 8);
176 avio_w8(pb, 0x1ff >> bytes);
177 ffio_fill(pb, 0xff, bytes - 1);
181 * Calculate how many bytes are needed to represent a given number in EBML.
183 static int ebml_num_size(uint64_t num)
186 while ((num + 1) >> bytes * 7)
192 * Write a number in EBML variable length format.
194 * @param bytes The number of bytes that need to be used to write the number.
195 * If zero, any number of bytes can be used.
197 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
199 int i, needed_bytes = ebml_num_size(num);
201 // sizes larger than this are currently undefined in EBML
202 av_assert0(num < (1ULL << 56) - 1);
205 // don't care how many bytes are used, so use the min
206 bytes = needed_bytes;
207 // the bytes needed to write the given size would exceed the bytes
208 // that we need to use, so write unknown size. This shouldn't happen.
209 av_assert0(bytes >= needed_bytes);
211 num |= 1ULL << bytes * 7;
212 for (i = bytes - 1; i >= 0; i--)
213 avio_w8(pb, (uint8_t)(num >> i * 8));
216 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
223 put_ebml_id(pb, elementid);
224 put_ebml_num(pb, bytes, 0);
225 for (i = bytes - 1; i >= 0; i--)
226 avio_w8(pb, (uint8_t)(val >> i * 8));
229 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
232 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
234 while (tmp>>=8) bytes++;
236 put_ebml_id(pb, elementid);
237 put_ebml_num(pb, bytes, 0);
238 for (i = bytes - 1; i >= 0; i--)
239 avio_w8(pb, (uint8_t)(val >> i * 8));
242 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
244 put_ebml_id(pb, elementid);
245 put_ebml_num(pb, 8, 0);
246 avio_wb64(pb, av_double2int(val));
249 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
250 const void *buf, int size)
252 put_ebml_id(pb, elementid);
253 put_ebml_num(pb, size, 0);
254 avio_write(pb, buf, size);
257 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
260 put_ebml_binary(pb, elementid, str, strlen(str));
264 * Write a void element of a given size. Useful for reserving space in
265 * the file to be written to later.
267 * @param size The number of bytes to reserve, which must be at least 2.
269 static void put_ebml_void(AVIOContext *pb, uint64_t size)
271 int64_t currentpos = avio_tell(pb);
273 av_assert0(size >= 2);
275 put_ebml_id(pb, EBML_ID_VOID);
276 // we need to subtract the length needed to store the size from the
277 // size we need to reserve so 2 cases, we use 8 bytes to store the
278 // size if possible, 1 byte otherwise
280 put_ebml_num(pb, size - 1, 0);
282 put_ebml_num(pb, size - 9, 8);
283 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
286 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
287 uint64_t expectedsize)
289 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
290 put_ebml_id(pb, elementid);
291 put_ebml_size_unknown(pb, bytes);
292 return (ebml_master) {avio_tell(pb), bytes };
295 static void end_ebml_master(AVIOContext *pb, ebml_master master)
297 int64_t pos = avio_tell(pb);
299 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
301 put_ebml_num(pb, pos - master.pos, master.sizebytes);
302 avio_seek(pb, pos, SEEK_SET);
305 static void put_xiph_size(AVIOContext *pb, int size)
307 ffio_fill(pb, 255, size / 255);
308 avio_w8(pb, size % 255);
312 * Free the members allocated in the mux context.
314 static void mkv_free(MatroskaMuxContext *mkv) {
315 if (mkv->main_seekhead) {
316 av_freep(&mkv->main_seekhead->entries);
317 av_freep(&mkv->main_seekhead);
320 av_freep(&mkv->cues->entries);
321 av_freep(&mkv->cues);
323 av_freep(&mkv->tracks);
324 av_freep(&mkv->stream_durations);
325 av_freep(&mkv->stream_duration_offsets);
329 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
330 * elements. If a maximum number of elements is specified, enough space
331 * will be reserved at the current file location to write a seek head of
334 * @param segment_offset The absolute offset to the position in the file
335 * where the segment begins.
336 * @param numelements The maximum number of elements that will be indexed
337 * by this seek head, 0 if unlimited.
339 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
342 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
346 new_seekhead->segment_offset = segment_offset;
348 if (numelements > 0) {
349 new_seekhead->filepos = avio_tell(pb);
350 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
351 // and size, and 3 bytes to guarantee that an EBML void element
352 // will fit afterwards
353 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
354 new_seekhead->max_entries = numelements;
355 put_ebml_void(pb, new_seekhead->reserved_size);
360 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
362 mkv_seekhead_entry *entries = seekhead->entries;
364 // don't store more elements than we reserved space for
365 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
368 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
370 return AVERROR(ENOMEM);
371 seekhead->entries = entries;
373 seekhead->entries[seekhead->num_entries].elementid = elementid;
374 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
380 * Write the seek head to the file and free it. If a maximum number of
381 * elements was specified to mkv_start_seekhead(), the seek head will
382 * be written at the location reserved for it. Otherwise, it is written
383 * at the current location in the file.
385 * @return The file offset where the seekhead was written,
386 * -1 if an error occurred.
388 static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
390 mkv_seekhead *seekhead = mkv->main_seekhead;
391 ebml_master metaseek, seekentry;
395 currentpos = avio_tell(pb);
397 if (seekhead->reserved_size > 0) {
398 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
404 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
405 for (i = 0; i < seekhead->num_entries; i++) {
406 mkv_seekhead_entry *entry = &seekhead->entries[i];
408 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
410 put_ebml_id(pb, MATROSKA_ID_SEEKID);
411 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
412 put_ebml_id(pb, entry->elementid);
414 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
415 end_ebml_master(pb, seekentry);
417 end_ebml_master(pb, metaseek);
419 if (seekhead->reserved_size > 0) {
420 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
421 put_ebml_void(pb, remaining);
422 avio_seek(pb, currentpos, SEEK_SET);
424 currentpos = seekhead->filepos;
427 av_freep(&mkv->main_seekhead->entries);
428 av_freep(&mkv->main_seekhead);
433 static mkv_cues *mkv_start_cues(int64_t segment_offset)
435 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
439 cues->segment_offset = segment_offset;
443 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
444 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
446 mkv_cuepoint *entries = cues->entries;
451 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
453 return AVERROR(ENOMEM);
454 cues->entries = entries;
456 cues->entries[cues->num_entries].pts = ts;
457 cues->entries[cues->num_entries].stream_idx = stream;
458 cues->entries[cues->num_entries].tracknum = tracknum;
459 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
460 cues->entries[cues->num_entries].relative_pos = relative_pos;
461 cues->entries[cues->num_entries++].duration = duration;
466 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
468 AVIOContext *pb = s->pb;
469 ebml_master cues_element;
473 currentpos = avio_tell(pb);
474 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
476 for (i = 0; i < cues->num_entries; i++) {
477 ebml_master cuepoint, track_positions;
478 mkv_cuepoint *entry = &cues->entries[i];
479 uint64_t pts = entry->pts;
482 // Calculate the number of entries, so we know the element size
483 for (j = 0; j < num_tracks; j++)
484 tracks[j].has_cue = 0;
485 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
486 int tracknum = entry[j].stream_idx;
487 av_assert0(tracknum>=0 && tracknum<num_tracks);
488 if (tracks[tracknum].has_cue && s->streams[tracknum]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
490 tracks[tracknum].has_cue = 1;
494 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
495 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
497 // put all the entries from different tracks that have the exact same
498 // timestamp into the same CuePoint
499 for (j = 0; j < num_tracks; j++)
500 tracks[j].has_cue = 0;
501 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
502 int tracknum = entry[j].stream_idx;
503 av_assert0(tracknum>=0 && tracknum<num_tracks);
504 if (tracks[tracknum].has_cue && s->streams[tracknum]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
506 tracks[tracknum].has_cue = 1;
507 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
508 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
509 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
510 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
511 if (entry[j].duration != -1)
512 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
513 end_ebml_master(pb, track_positions);
516 end_ebml_master(pb, cuepoint);
518 end_ebml_master(pb, cues_element);
523 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
525 const uint8_t *header_start[3];
527 int first_header_size;
530 if (codec->codec_id == AV_CODEC_ID_VORBIS)
531 first_header_size = 30;
533 first_header_size = 42;
535 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
536 first_header_size, header_start, header_len) < 0) {
537 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
541 avio_w8(pb, 2); // number packets - 1
542 for (j = 0; j < 2; j++) {
543 put_xiph_size(pb, header_len[j]);
545 for (j = 0; j < 3; j++)
546 avio_write(pb, header_start[j], header_len[j]);
551 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
553 if (codec->extradata && codec->extradata_size == 2)
554 avio_write(pb, codec->extradata, 2);
556 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
560 static int put_flac_codecpriv(AVFormatContext *s,
561 AVIOContext *pb, AVCodecContext *codec)
563 int write_comment = (codec->channel_layout &&
564 !(codec->channel_layout & ~0x3ffffULL) &&
565 !ff_flac_is_native_layout(codec->channel_layout));
566 int ret = ff_flac_write_header(pb, codec->extradata, codec->extradata_size,
573 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
574 "Lavf" : LIBAVFORMAT_IDENT;
575 AVDictionary *dict = NULL;
576 uint8_t buf[32], *data, *p;
579 snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
580 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
582 len = ff_vorbiscomment_length(dict, vendor);
583 if (len >= ((1<<24) - 4))
584 return AVERROR(EINVAL);
586 data = av_malloc(len + 4);
589 return AVERROR(ENOMEM);
593 AV_WB24(data + 1, len);
596 ff_vorbiscomment_write(&p, &dict, vendor);
598 avio_write(pb, data, len + 4);
607 static int get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec,
608 int *sample_rate, int *output_sample_rate)
610 MPEG4AudioConfig mp4ac;
612 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
613 codec->extradata_size * 8, 1) < 0) {
614 av_log(s, AV_LOG_ERROR,
615 "Error parsing AAC extradata, unable to determine samplerate.\n");
616 return AVERROR(EINVAL);
619 *sample_rate = mp4ac.sample_rate;
620 *output_sample_rate = mp4ac.ext_sample_rate;
624 static int mkv_write_native_codecprivate(AVFormatContext *s,
625 AVCodecContext *codec,
628 switch (codec->codec_id) {
629 case AV_CODEC_ID_VORBIS:
630 case AV_CODEC_ID_THEORA:
631 return put_xiph_codecpriv(s, dyn_cp, codec);
632 case AV_CODEC_ID_FLAC:
633 return put_flac_codecpriv(s, dyn_cp, codec);
634 case AV_CODEC_ID_WAVPACK:
635 return put_wv_codecpriv(dyn_cp, codec);
636 case AV_CODEC_ID_H264:
637 return ff_isom_write_avcc(dyn_cp, codec->extradata,
638 codec->extradata_size);
639 case AV_CODEC_ID_HEVC:
640 ff_isom_write_hvcc(dyn_cp, codec->extradata,
641 codec->extradata_size, 0);
643 case AV_CODEC_ID_ALAC:
644 if (codec->extradata_size < 36) {
645 av_log(s, AV_LOG_ERROR,
646 "Invalid extradata found, ALAC expects a 36-byte "
648 return AVERROR_INVALIDDATA;
650 avio_write(dyn_cp, codec->extradata + 12,
651 codec->extradata_size - 12);
654 if (codec->codec_id == AV_CODEC_ID_PRORES &&
655 ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == AV_CODEC_ID_PRORES) {
656 avio_wl32(dyn_cp, codec->codec_tag);
657 } else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
658 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
664 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
665 AVCodecContext *codec, int native_id,
670 int ret, codecpriv_size;
672 ret = avio_open_dyn_buf(&dyn_cp);
677 ret = mkv_write_native_codecprivate(s, codec, dyn_cp);
678 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
680 if (!codec->codec_tag)
681 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
683 if (codec->extradata_size) {
684 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
685 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata + 4)) != codec->codec_id
688 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
689 avio_wl32(dyn_cp, codec->codec_tag);
690 for(i = 0; i < 0x5a - 8; i++)
693 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
696 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
697 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
698 avcodec_get_name(codec->codec_id));
700 if (!codec->codec_tag)
701 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
703 if (!codec->codec_tag && codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
704 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
705 avcodec_get_name(codec->codec_id));
706 ret = AVERROR(EINVAL);
709 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
711 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
713 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
715 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
716 avcodec_get_name(codec->codec_id));
717 ret = AVERROR(EINVAL);
719 if (!codec->codec_tag)
720 codec->codec_tag = tag;
722 ff_put_wav_header(dyn_cp, codec, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
725 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
727 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
734 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
735 AVStream *st, int mode, int *h_width, int *h_height)
739 AVDictionaryEntry *tag;
740 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
744 // convert metadata into proper side data and add it to the stream
745 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
746 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
747 int stereo_mode = atoi(tag->value);
749 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
750 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
755 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
756 stereo_mode != 10 && stereo_mode != 12) {
757 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
763 // iterate to find the stereo3d side data
764 for (i = 0; i < st->nb_side_data; i++) {
765 AVPacketSideData sd = st->side_data[i];
766 if (sd.type == AV_PKT_DATA_STEREO3D) {
767 AVStereo3D *stereo = (AVStereo3D *)sd.data;
769 switch (stereo->type) {
771 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
773 case AV_STEREO3D_SIDEBYSIDE:
774 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
775 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
776 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
779 case AV_STEREO3D_TOPBOTTOM:
780 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
781 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
785 case AV_STEREO3D_CHECKERBOARD:
786 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
787 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
790 case AV_STEREO3D_LINES:
791 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
792 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
796 case AV_STEREO3D_COLUMNS:
797 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
798 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
802 case AV_STEREO3D_FRAMESEQUENCE:
803 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
804 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
812 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
815 // if webm, do not write unsupported modes
816 if ((mode == MODE_WEBM &&
817 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
818 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
819 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
820 av_log(s, AV_LOG_ERROR,
821 "The specified stereo mode is not valid.\n");
822 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
823 return AVERROR(EINVAL);
826 // write StereoMode if format is valid
827 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
832 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
833 int i, AVIOContext *pb, int default_stream_exists)
835 AVStream *st = s->streams[i];
836 AVCodecContext *codec = st->codec;
837 ebml_master subinfo, track;
840 int bit_depth = av_get_bits_per_sample(codec->codec_id);
841 int sample_rate = codec->sample_rate;
842 int output_sample_rate = 0;
843 int display_width_div = 1;
844 int display_height_div = 1;
846 AVDictionaryEntry *tag;
848 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
849 mkv->have_attachments = 1;
853 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
854 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
856 bit_depth = codec->bits_per_coded_sample;
858 if (codec->codec_id == AV_CODEC_ID_AAC) {
859 ret = get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
864 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
865 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
866 mkv->is_dash ? mkv->dash_track_number : i + 1);
867 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
868 mkv->is_dash ? mkv->dash_track_number : i + 1);
869 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
871 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
872 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
873 tag = av_dict_get(st->metadata, "language", NULL, 0);
874 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
875 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
876 } else if (tag && tag->value) {
877 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
880 // The default value for TRACKFLAGDEFAULT is 1, so add element
881 // if we need to clear it.
882 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
883 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
885 if (st->disposition & AV_DISPOSITION_FORCED)
886 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
888 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
889 const char *codec_id;
890 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
891 codec_id = "D_WEBVTT/CAPTIONS";
892 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
893 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
894 codec_id = "D_WEBVTT/DESCRIPTIONS";
895 native_id = MATROSKA_TRACK_TYPE_METADATA;
896 } else if (st->disposition & AV_DISPOSITION_METADATA) {
897 codec_id = "D_WEBVTT/METADATA";
898 native_id = MATROSKA_TRACK_TYPE_METADATA;
900 codec_id = "D_WEBVTT/SUBTITLES";
901 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
903 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
905 // look for a codec ID string specific to mkv to use,
906 // if none are found, use AVI codes
907 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
908 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
909 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
914 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->codec_tag) {
915 if (mkv->allow_raw_vfw) {
918 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
919 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
920 return AVERROR(EINVAL);
925 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->initial_padding && codec->codec_id == AV_CODEC_ID_OPUS) {
926 int64_t codecdelay = av_rescale_q(codec->initial_padding,
927 (AVRational){ 1, 48000 },
928 (AVRational){ 1, 1000000000 });
929 if (codecdelay < 0) {
930 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
931 return AVERROR(EINVAL);
933 // mkv->tracks[i].ts_offset = av_rescale_q(codec->initial_padding,
934 // (AVRational){ 1, codec->sample_rate },
937 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
939 if (codec->codec_id == AV_CODEC_ID_OPUS) {
940 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
943 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
944 codec->codec_id == AV_CODEC_ID_VP9 ||
945 codec->codec_id == AV_CODEC_ID_OPUS ||
946 codec->codec_id == AV_CODEC_ID_VORBIS ||
947 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
948 av_log(s, AV_LOG_ERROR,
949 "Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
950 return AVERROR(EINVAL);
953 switch (codec->codec_type) {
954 case AVMEDIA_TYPE_VIDEO:
955 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
957 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
958 && av_cmp_q(av_inv_q(st->avg_frame_rate), codec->time_base) > 0)
959 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
961 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * codec->time_base.num / codec->time_base.den);
964 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
965 ((!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id) && codec->codec_id != AV_CODEC_ID_RAWVIDEO) ||
966 codec->codec_id == AV_CODEC_ID_SVQ1 ||
967 codec->codec_id == AV_CODEC_ID_SVQ3 ||
968 codec->codec_id == AV_CODEC_ID_CINEPAK))
972 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
973 else if (!native_id) {
974 // if there is no mkv-specific codec ID, use VFW mode
975 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
976 mkv->tracks[i].write_dts = 1;
977 s->internal->avoid_negative_ts_use_pts = 0;
980 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
981 // XXX: interlace flag?
982 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
983 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
985 // check both side data and metadata for stereo information,
986 // write the result to the bitstream if any is found
987 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
989 &display_height_div);
993 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
994 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
995 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
996 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
999 // write DisplayWidth and DisplayHeight, they contain the size of
1000 // a single source view and/or the display aspect ratio
1001 if (st->sample_aspect_ratio.num) {
1002 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1003 if (d_width > INT_MAX) {
1004 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1005 return AVERROR(EINVAL);
1007 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1008 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
1009 } else if (display_width_div != 1 || display_height_div != 1) {
1010 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
1011 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
1014 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
1015 uint32_t color_space = av_le2ne32(codec->codec_tag);
1016 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1019 end_ebml_master(pb, subinfo);
1022 case AVMEDIA_TYPE_AUDIO:
1023 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1026 // no mkv-specific ID, use ACM mode
1027 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1029 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1030 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
1031 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1032 if (output_sample_rate)
1033 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1035 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1036 end_ebml_master(pb, subinfo);
1039 case AVMEDIA_TYPE_SUBTITLE:
1041 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
1042 return AVERROR(ENOSYS);
1045 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
1046 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1048 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1051 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1052 return AVERROR(EINVAL);
1055 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
1056 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
1061 end_ebml_master(pb, track);
1066 static int mkv_write_tracks(AVFormatContext *s)
1068 MatroskaMuxContext *mkv = s->priv_data;
1069 AVIOContext *pb = s->pb;
1071 int i, ret, default_stream_exists = 0;
1073 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1077 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
1078 for (i = 0; i < s->nb_streams; i++) {
1079 AVStream *st = s->streams[i];
1080 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1082 for (i = 0; i < s->nb_streams; i++) {
1083 ret = mkv_write_track(s, mkv, i, pb, default_stream_exists);
1087 end_ebml_master(pb, tracks);
1091 static int mkv_write_chapters(AVFormatContext *s)
1093 MatroskaMuxContext *mkv = s->priv_data;
1094 AVIOContext *pb = s->pb;
1095 ebml_master chapters, editionentry;
1096 AVRational scale = {1, 1E9};
1099 if (!s->nb_chapters || mkv->wrote_chapters)
1102 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1103 if (ret < 0) return ret;
1105 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
1106 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
1107 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1108 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1109 for (i = 0; i < s->nb_chapters; i++) {
1110 ebml_master chapteratom, chapterdisplay;
1111 AVChapter *c = s->chapters[i];
1112 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1113 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1114 AVDictionaryEntry *t = NULL;
1115 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1116 av_log(s, AV_LOG_ERROR,
1117 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1118 chapterstart, chapterend);
1119 return AVERROR_INVALIDDATA;
1122 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
1123 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1124 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1125 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1126 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1127 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1128 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1129 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
1130 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
1131 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
1132 end_ebml_master(pb, chapterdisplay);
1134 end_ebml_master(pb, chapteratom);
1136 end_ebml_master(pb, editionentry);
1137 end_ebml_master(pb, chapters);
1139 mkv->wrote_chapters = 1;
1143 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1145 uint8_t *key = av_strdup(t->key);
1147 const uint8_t *lang = NULL;
1151 return AVERROR(ENOMEM);
1153 if ((p = strrchr(p, '-')) &&
1154 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1161 else if (*p >= 'a' && *p <= 'z')
1166 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1167 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1169 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1170 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1171 end_ebml_master(pb, tag);
1177 static int mkv_write_tag_targets(AVFormatContext *s,
1178 unsigned int elementid, unsigned int uid,
1179 ebml_master *tags, ebml_master* tag)
1181 MatroskaMuxContext *mkv = s->priv_data;
1182 ebml_master targets;
1186 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1187 if (ret < 0) return ret;
1189 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
1192 *tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
1193 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
1195 put_ebml_uint(s->pb, elementid, uid);
1196 end_ebml_master(s->pb, targets);
1200 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1201 unsigned int uid, ebml_master *tags)
1205 AVDictionaryEntry *t = NULL;
1207 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1211 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1212 if (av_strcasecmp(t->key, "title") &&
1213 av_strcasecmp(t->key, "stereo_mode") &&
1214 av_strcasecmp(t->key, "creation_time") &&
1215 av_strcasecmp(t->key, "encoding_tool") &&
1216 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1217 av_strcasecmp(t->key, "language"))) {
1218 ret = mkv_write_simpletag(s->pb, t);
1224 end_ebml_master(s->pb, tag);
1228 static int mkv_check_tag(AVDictionary *m)
1230 AVDictionaryEntry *t = NULL;
1232 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1233 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
1239 static int mkv_write_tags(AVFormatContext *s)
1241 MatroskaMuxContext *mkv = s->priv_data;
1242 ebml_master tags = {0};
1245 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1247 if (mkv_check_tag(s->metadata)) {
1248 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
1249 if (ret < 0) return ret;
1252 for (i = 0; i < s->nb_streams; i++) {
1253 AVStream *st = s->streams[i];
1255 if (!mkv_check_tag(st->metadata))
1258 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
1259 if (ret < 0) return ret;
1262 if (!mkv->is_live) {
1263 for (i = 0; i < s->nb_streams; i++) {
1264 ebml_master tag_target;
1267 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags, &tag_target);
1269 tag = start_ebml_master(s->pb, MATROSKA_ID_SIMPLETAG, 0);
1270 put_ebml_string(s->pb, MATROSKA_ID_TAGNAME, "DURATION");
1271 mkv->stream_duration_offsets[i] = avio_tell(s->pb);
1273 // Reserve space to write duration as a 20-byte string.
1274 // 2 (ebml id) + 1 (data size) + 20 (data)
1275 put_ebml_void(s->pb, 23);
1276 end_ebml_master(s->pb, tag);
1277 end_ebml_master(s->pb, tag_target);
1281 for (i = 0; i < s->nb_chapters; i++) {
1282 AVChapter *ch = s->chapters[i];
1284 if (!mkv_check_tag(ch->metadata))
1287 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
1288 if (ret < 0) return ret;
1292 end_ebml_master(s->pb, tags);
1296 static int mkv_write_attachments(AVFormatContext *s)
1298 MatroskaMuxContext *mkv = s->priv_data;
1299 AVIOContext *pb = s->pb;
1300 ebml_master attachments;
1304 if (!mkv->have_attachments)
1307 av_lfg_init(&c, av_get_random_seed());
1309 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1310 if (ret < 0) return ret;
1312 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1314 for (i = 0; i < s->nb_streams; i++) {
1315 AVStream *st = s->streams[i];
1316 ebml_master attached_file;
1317 AVDictionaryEntry *t;
1318 const char *mimetype = NULL;
1321 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1324 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1326 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1327 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1328 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1329 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1330 return AVERROR(EINVAL);
1332 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1333 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1334 mimetype = t->value;
1335 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1337 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1338 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1339 mimetype = ff_mkv_mime_tags[i].str;
1342 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1343 if (ff_mkv_image_mime_tags[i].id == st->codec->codec_id) {
1344 mimetype = ff_mkv_image_mime_tags[i].str;
1349 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1350 "it cannot be deduced from the codec id.\n", i);
1351 return AVERROR(EINVAL);
1354 if (s->flags & AVFMT_FLAG_BITEXACT) {
1355 struct AVSHA *sha = av_sha_alloc();
1358 return AVERROR(ENOMEM);
1359 av_sha_init(sha, 160);
1360 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1361 av_sha_final(sha, digest);
1363 fileuid = AV_RL64(digest);
1365 fileuid = av_lfg_get(&c);
1367 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1370 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1371 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1372 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1373 end_ebml_master(pb, attached_file);
1375 end_ebml_master(pb, attachments);
1380 static int mkv_write_header(AVFormatContext *s)
1382 MatroskaMuxContext *mkv = s->priv_data;
1383 AVIOContext *pb = s->pb;
1384 ebml_master ebml_header, segment_info;
1385 AVDictionaryEntry *tag;
1386 int ret, i, version = 2;
1387 int64_t creation_time;
1389 if (!strcmp(s->oformat->name, "webm"))
1390 mkv->mode = MODE_WEBM;
1392 mkv->mode = MODE_MATROSKAv2;
1394 if (mkv->mode != MODE_WEBM ||
1395 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1396 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1399 for (i = 0; i < s->nb_streams; i++) {
1400 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1401 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1402 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1403 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1404 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1405 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1406 av_log(s, AV_LOG_ERROR,
1407 "The Matroska muxer does not yet support muxing %s\n",
1408 avcodec_get_name(s->streams[i]->codec->codec_id));
1409 return AVERROR_PATCHWELCOME;
1411 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_OPUS ||
1412 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1413 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1417 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1419 ret = AVERROR(ENOMEM);
1422 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1423 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1424 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1425 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1426 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1427 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1428 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1429 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1430 end_ebml_master(pb, ebml_header);
1432 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1433 mkv->segment_offset = avio_tell(pb);
1435 // we write 2 seek heads - one at the end of the file to point to each
1436 // cluster, and one at the beginning to point to all other level one
1437 // elements (including the seek head at the end of the file), which
1438 // isn't more than 10 elements if we only write one of each other
1439 // currently defined level 1 element
1440 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1441 if (!mkv->main_seekhead) {
1442 ret = AVERROR(ENOMEM);
1446 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1447 if (ret < 0) goto fail;
1449 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1450 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1451 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1452 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1453 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1454 uint32_t segment_uid[4];
1457 av_lfg_init(&lfg, av_get_random_seed());
1459 for (i = 0; i < 4; i++)
1460 segment_uid[i] = av_lfg_get(&lfg);
1462 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1463 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1464 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1466 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1467 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1469 const char *ident = "Lavf";
1470 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1471 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1474 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1475 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1476 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1477 uint8_t date_utc_buf[8];
1478 AV_WB64(date_utc_buf, date_utc);
1479 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1482 // reserve space for the duration
1484 mkv->duration_offset = avio_tell(pb);
1485 if (!mkv->is_live) {
1486 put_ebml_void(pb, 11); // assumes double-precision float to be written
1488 end_ebml_master(pb, segment_info);
1490 // initialize stream_duration fields
1491 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1492 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1494 ret = mkv_write_tracks(s);
1498 for (i = 0; i < s->nb_chapters; i++)
1499 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1501 if (mkv->mode != MODE_WEBM) {
1502 ret = mkv_write_chapters(s);
1506 ret = mkv_write_tags(s);
1510 ret = mkv_write_attachments(s);
1515 if (!s->pb->seekable && !mkv->is_live)
1516 mkv_write_seekhead(pb, mkv);
1518 mkv->cues = mkv_start_cues(mkv->segment_offset);
1520 ret = AVERROR(ENOMEM);
1523 if (pb->seekable && mkv->reserve_cues_space) {
1524 mkv->cues_pos = avio_tell(pb);
1525 put_ebml_void(pb, mkv->reserve_cues_space);
1528 av_init_packet(&mkv->cur_audio_pkt);
1529 mkv->cur_audio_pkt.size = 0;
1530 mkv->cluster_pos = -1;
1534 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1535 // after 4k and on a keyframe
1537 if (mkv->cluster_time_limit < 0)
1538 mkv->cluster_time_limit = 5000;
1539 if (mkv->cluster_size_limit < 0)
1540 mkv->cluster_size_limit = 5 * 1024 * 1024;
1542 if (mkv->cluster_time_limit < 0)
1543 mkv->cluster_time_limit = 1000;
1544 if (mkv->cluster_size_limit < 0)
1545 mkv->cluster_size_limit = 32 * 1024;
1554 static int mkv_blockgroup_size(int pkt_size)
1556 int size = pkt_size + 4;
1557 size += ebml_num_size(size);
1558 size += 2; // EBML ID for block and block duration
1559 size += 8; // max size of block duration
1560 size += ebml_num_size(size);
1561 size += 1; // blockgroup EBML ID
1565 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1572 dst = av_malloc(srclen);
1574 return AVERROR(ENOMEM);
1576 while (srclen >= WV_HEADER_SIZE) {
1579 ret = ff_wv_parse_header(&header, src);
1582 src += WV_HEADER_SIZE;
1583 srclen -= WV_HEADER_SIZE;
1585 if (srclen < header.blocksize) {
1586 ret = AVERROR_INVALIDDATA;
1590 if (header.initial) {
1591 AV_WL32(dst + offset, header.samples);
1594 AV_WL32(dst + offset, header.flags);
1595 AV_WL32(dst + offset + 4, header.crc);
1598 if (!(header.initial && header.final)) {
1599 AV_WL32(dst + offset, header.blocksize);
1603 memcpy(dst + offset, src, header.blocksize);
1604 src += header.blocksize;
1605 srclen -= header.blocksize;
1606 offset += header.blocksize;
1618 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1619 unsigned int blockid, AVPacket *pkt, int keyframe)
1621 MatroskaMuxContext *mkv = s->priv_data;
1622 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1623 uint8_t *data = NULL, *side_data = NULL;
1624 int offset = 0, size = pkt->size, side_data_size = 0;
1625 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1626 uint64_t additional_id = 0;
1627 int64_t discard_padding = 0;
1628 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
1629 ebml_master block_group, block_additions, block_more;
1631 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1632 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
1633 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
1635 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1636 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1637 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1638 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1639 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1640 /* extradata is Annex B, assume the bitstream is too and convert it */
1641 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1642 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1643 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1645 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1651 if (codec->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
1652 /* Matroska specification requires to remove the first QuickTime atom
1658 side_data = av_packet_get_side_data(pkt,
1659 AV_PKT_DATA_SKIP_SAMPLES,
1662 if (side_data && side_data_size >= 10) {
1663 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1664 (AVRational){1, codec->sample_rate},
1665 (AVRational){1, 1000000000});
1668 side_data = av_packet_get_side_data(pkt,
1669 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1672 additional_id = AV_RB64(side_data);
1674 side_data_size -= 8;
1677 if ((side_data_size && additional_id == 1) || discard_padding) {
1678 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1679 blockid = MATROSKA_ID_BLOCK;
1682 put_ebml_id(pb, blockid);
1683 put_ebml_num(pb, size + 4, 0);
1684 // this assumes stream_index is less than 126
1685 avio_w8(pb, 0x80 | track_number);
1686 avio_wb16(pb, ts - mkv->cluster_pts);
1687 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
1688 avio_write(pb, data + offset, size);
1689 if (data != pkt->data)
1692 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
1693 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
1694 mkv->last_track_timestamp[track_number - 1]);
1696 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
1698 if (discard_padding) {
1699 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1702 if (side_data_size && additional_id == 1) {
1703 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1704 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1705 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1706 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1707 put_ebml_num(pb, side_data_size, 0);
1708 avio_write(pb, side_data, side_data_size);
1709 end_ebml_master(pb, block_more);
1710 end_ebml_master(pb, block_additions);
1712 if ((side_data_size && additional_id == 1) || discard_padding) {
1713 end_ebml_master(pb, block_group);
1717 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1719 MatroskaMuxContext *mkv = s->priv_data;
1720 ebml_master blockgroup;
1721 int id_size, settings_size, size;
1722 uint8_t *id, *settings;
1723 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1724 const int flags = 0;
1727 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1731 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1734 size = id_size + 1 + settings_size + 1 + pkt->size;
1736 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1737 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
1738 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1740 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1742 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1743 put_ebml_num(pb, size + 4, 0);
1744 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1745 avio_wb16(pb, ts - mkv->cluster_pts);
1747 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1749 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1750 end_ebml_master(pb, blockgroup);
1752 return pkt->duration;
1755 static void mkv_flush_dynbuf(AVFormatContext *s)
1757 MatroskaMuxContext *mkv = s->priv_data;
1764 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1765 avio_write(s->pb, dyn_buf, bufsize);
1770 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
1772 MatroskaMuxContext *mkv = s->priv_data;
1775 if (s->pb->seekable) {
1781 av_log(s, AV_LOG_DEBUG,
1782 "Starting new cluster at offset %" PRIu64 " bytes, "
1783 "pts %" PRIu64 "dts %" PRIu64 "\n",
1784 avio_tell(pb), pkt->pts, pkt->dts);
1785 end_ebml_master(pb, mkv->cluster);
1786 mkv->cluster_pos = -1;
1788 mkv_flush_dynbuf(s);
1792 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
1794 MatroskaMuxContext *mkv = s->priv_data;
1795 AVIOContext *pb = s->pb;
1796 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1797 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1798 int duration = pkt->duration;
1800 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1801 int64_t relative_packet_pos;
1802 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
1804 if (ts == AV_NOPTS_VALUE) {
1805 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1806 return AVERROR(EINVAL);
1808 ts += mkv->tracks[pkt->stream_index].ts_offset;
1810 if (mkv->cluster_pos != -1) {
1811 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
1812 if ((int16_t)cluster_time != cluster_time) {
1813 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
1814 mkv_start_new_cluster(s, pkt);
1818 if (!s->pb->seekable) {
1820 ret = avio_open_dyn_buf(&mkv->dyn_bc);
1822 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1829 if (mkv->cluster_pos == -1) {
1830 mkv->cluster_pos = avio_tell(s->pb);
1831 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1832 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1833 mkv->cluster_pts = FFMAX(0, ts);
1836 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1838 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1839 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
1840 if (s->pb->seekable && (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
1841 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
1842 if (ret < 0) return ret;
1845 if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1846 duration = mkv_write_vtt_blocks(s, pb, pkt);
1848 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1849 mkv_blockgroup_size(pkt->size));
1851 #if FF_API_CONVERGENCE_DURATION
1852 FF_DISABLE_DEPRECATION_WARNINGS
1853 /* For backward compatibility, prefer convergence_duration. */
1854 if (pkt->convergence_duration > 0) {
1855 duration = pkt->convergence_duration;
1857 FF_ENABLE_DEPRECATION_WARNINGS
1859 /* All subtitle blocks are considered to be keyframes. */
1860 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
1861 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1862 end_ebml_master(pb, blockgroup);
1865 if (s->pb->seekable) {
1866 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
1867 mkv->cluster_pos, relative_packet_pos, duration);
1873 mkv->duration = FFMAX(mkv->duration, ts + duration);
1875 if (mkv->stream_durations)
1876 mkv->stream_durations[pkt->stream_index] =
1877 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
1882 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1884 MatroskaMuxContext *mkv = s->priv_data;
1885 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1886 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1888 int64_t cluster_time;
1890 int start_new_cluster;
1892 if (mkv->tracks[pkt->stream_index].write_dts)
1893 cluster_time = pkt->dts - mkv->cluster_pts;
1895 cluster_time = pkt->pts - mkv->cluster_pts;
1896 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1898 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1899 // after 4k and on a keyframe
1900 if (s->pb->seekable) {
1901 cluster_size = avio_tell(s->pb) - mkv->cluster_pos;
1903 cluster_size = avio_tell(mkv->dyn_bc);
1906 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
1907 // WebM DASH specification states that the first block of every cluster
1908 // has to be a key frame. So for DASH video, we only create a cluster
1909 // on seeing key frames.
1910 start_new_cluster = keyframe;
1911 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
1912 (mkv->cluster_pos == -1 ||
1913 cluster_time > mkv->cluster_time_limit)) {
1914 // For DASH audio, we create a Cluster based on cluster_time_limit
1915 start_new_cluster = 1;
1916 } else if (!mkv->is_dash &&
1917 (cluster_size > mkv->cluster_size_limit ||
1918 cluster_time > mkv->cluster_time_limit ||
1919 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1920 cluster_size > 4 * 1024))) {
1921 start_new_cluster = 1;
1923 start_new_cluster = 0;
1926 if (mkv->cluster_pos != -1 && start_new_cluster) {
1927 mkv_start_new_cluster(s, pkt);
1930 // check if we have an audio packet cached
1931 if (mkv->cur_audio_pkt.size > 0) {
1932 // for DASH audio, a CuePoint has to be added when there is a new cluster.
1933 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
1934 mkv->is_dash ? start_new_cluster : 0);
1935 av_packet_unref(&mkv->cur_audio_pkt);
1937 av_log(s, AV_LOG_ERROR,
1938 "Could not write cached audio packet ret:%d\n", ret);
1943 // buffer an audio packet to ensure the packet containing the video
1944 // keyframe's timecode is contained in the same cluster for WebM
1945 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1946 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
1948 ret = mkv_write_packet_internal(s, pkt, 0);
1952 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1954 MatroskaMuxContext *mkv = s->priv_data;
1956 if (s->pb->seekable)
1961 if (mkv->cluster_pos != -1) {
1962 av_log(s, AV_LOG_DEBUG,
1963 "Flushing cluster at offset %" PRIu64 " bytes\n",
1965 end_ebml_master(pb, mkv->cluster);
1966 mkv->cluster_pos = -1;
1968 mkv_flush_dynbuf(s);
1973 return mkv_write_packet(s, pkt);
1976 static int mkv_write_trailer(AVFormatContext *s)
1978 MatroskaMuxContext *mkv = s->priv_data;
1979 AVIOContext *pb = s->pb;
1980 int64_t currentpos, cuespos;
1983 // check if we have an audio packet cached
1984 if (mkv->cur_audio_pkt.size > 0) {
1985 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
1986 av_packet_unref(&mkv->cur_audio_pkt);
1988 av_log(s, AV_LOG_ERROR,
1989 "Could not write cached audio packet ret:%d\n", ret);
1995 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1996 mkv_flush_dynbuf(s);
1997 } else if (mkv->cluster_pos != -1) {
1998 end_ebml_master(pb, mkv->cluster);
2001 if (mkv->mode != MODE_WEBM) {
2002 ret = mkv_write_chapters(s);
2008 if (mkv->cues->num_entries) {
2009 if (mkv->reserve_cues_space) {
2012 currentpos = avio_tell(pb);
2013 avio_seek(pb, mkv->cues_pos, SEEK_SET);
2015 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2016 cues_end = avio_tell(pb);
2017 if (cues_end > cuespos + mkv->reserve_cues_space) {
2018 av_log(s, AV_LOG_ERROR,
2019 "Insufficient space reserved for cues: %d "
2020 "(needed: %" PRId64 ").\n",
2021 mkv->reserve_cues_space, cues_end - cuespos);
2022 return AVERROR(EINVAL);
2025 if (cues_end < cuespos + mkv->reserve_cues_space)
2026 put_ebml_void(pb, mkv->reserve_cues_space -
2027 (cues_end - cuespos));
2029 avio_seek(pb, currentpos, SEEK_SET);
2031 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2034 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2040 mkv_write_seekhead(pb, mkv);
2042 // update the duration
2043 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2044 currentpos = avio_tell(pb);
2045 avio_seek(pb, mkv->duration_offset, SEEK_SET);
2046 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
2048 // update stream durations
2049 if (mkv->stream_durations) {
2051 for (i = 0; i < s->nb_streams; ++i) {
2052 AVStream *st = s->streams[i];
2053 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2054 char duration_string[20] = "";
2056 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2057 mkv->stream_durations[i]);
2059 if (!mkv->is_live && mkv->stream_duration_offsets[i] > 0) {
2060 avio_seek(pb, mkv->stream_duration_offsets[i], SEEK_SET);
2062 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2063 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2064 fmod(duration_sec, 60));
2066 put_ebml_binary(pb, MATROSKA_ID_TAGSTRING, duration_string, 20);
2071 avio_seek(pb, currentpos, SEEK_SET);
2074 if (!mkv->is_live) {
2075 end_ebml_master(pb, mkv->segment);
2082 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2085 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2086 if (ff_mkv_codec_tags[i].id == codec_id)
2089 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2090 enum AVMediaType type = avcodec_get_type(codec_id);
2091 // mkv theoretically supports any video/audio through VFW/ACM
2092 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2099 static int mkv_init(struct AVFormatContext *s)
2103 if (s->avoid_negative_ts < 0) {
2104 s->avoid_negative_ts = 1;
2105 s->internal->avoid_negative_ts_use_pts = 1;
2108 for (i = 0; i < s->nb_streams; i++) {
2109 // ms precision is the de-facto standard timescale for mkv files
2110 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2116 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2119 AVStream *st = s->streams[pkt->stream_index];
2121 if (st->codec->codec_id == AV_CODEC_ID_AAC)
2122 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2123 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2128 static const AVCodecTag additional_audio_tags[] = {
2129 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2130 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
2131 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2132 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2133 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2134 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2135 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2136 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2137 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2138 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2139 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2140 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2141 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2144 static const AVCodecTag additional_video_tags[] = {
2145 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2146 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2147 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2148 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
2149 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
2150 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2153 static const AVCodecTag additional_subtitle_tags[] = {
2154 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2155 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2156 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2159 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2160 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2161 static const AVOption options[] = {
2162 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
2163 { "cluster_size_limit", "Store at most the provided amount of bytes in a cluster. ", OFFSET(cluster_size_limit), AV_OPT_TYPE_INT , { .i64 = -1 }, -1, INT_MAX, FLAGS },
2164 { "cluster_time_limit", "Store at most the provided number of milliseconds in a cluster.", OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
2165 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2166 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2167 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2168 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2172 #if CONFIG_MATROSKA_MUXER
2173 static const AVClass matroska_class = {
2174 .class_name = "matroska muxer",
2175 .item_name = av_default_item_name,
2177 .version = LIBAVUTIL_VERSION_INT,
2180 AVOutputFormat ff_matroska_muxer = {
2182 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2183 .mime_type = "video/x-matroska",
2184 .extensions = "mkv",
2185 .priv_data_size = sizeof(MatroskaMuxContext),
2186 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2187 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2188 .video_codec = CONFIG_LIBX264_ENCODER ?
2189 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2191 .write_header = mkv_write_header,
2192 .write_packet = mkv_write_flush_packet,
2193 .write_trailer = mkv_write_trailer,
2194 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2195 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2196 .codec_tag = (const AVCodecTag* const []){
2197 ff_codec_bmp_tags, ff_codec_wav_tags,
2198 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2200 .subtitle_codec = AV_CODEC_ID_ASS,
2201 .query_codec = mkv_query_codec,
2202 .check_bitstream = mkv_check_bitstream,
2203 .priv_class = &matroska_class,
2207 #if CONFIG_WEBM_MUXER
2208 static const AVClass webm_class = {
2209 .class_name = "webm muxer",
2210 .item_name = av_default_item_name,
2212 .version = LIBAVUTIL_VERSION_INT,
2215 AVOutputFormat ff_webm_muxer = {
2217 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2218 .mime_type = "video/webm",
2219 .extensions = "webm",
2220 .priv_data_size = sizeof(MatroskaMuxContext),
2221 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2222 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2223 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2225 .write_header = mkv_write_header,
2226 .write_packet = mkv_write_flush_packet,
2227 .write_trailer = mkv_write_trailer,
2228 .check_bitstream = mkv_check_bitstream,
2229 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2230 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2231 .priv_class = &webm_class,
2235 #if CONFIG_MATROSKA_AUDIO_MUXER
2236 static const AVClass mka_class = {
2237 .class_name = "matroska audio muxer",
2238 .item_name = av_default_item_name,
2240 .version = LIBAVUTIL_VERSION_INT,
2242 AVOutputFormat ff_matroska_audio_muxer = {
2244 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2245 .mime_type = "audio/x-matroska",
2246 .extensions = "mka",
2247 .priv_data_size = sizeof(MatroskaMuxContext),
2248 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2249 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2250 .video_codec = AV_CODEC_ID_NONE,
2252 .write_header = mkv_write_header,
2253 .write_packet = mkv_write_flush_packet,
2254 .write_trailer = mkv_write_trailer,
2255 .check_bitstream = mkv_check_bitstream,
2256 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2258 .codec_tag = (const AVCodecTag* const []){
2259 ff_codec_wav_tags, additional_audio_tags, 0
2261 .priv_class = &mka_class,