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
28 #include "avio_internal.h"
29 #include "avlanguage.h"
35 #include "subtitles.h"
36 #include "vorbiscomment.h"
39 #include "libavutil/avstring.h"
40 #include "libavutil/channel_layout.h"
41 #include "libavutil/crc.h"
42 #include "libavutil/dict.h"
43 #include "libavutil/intfloat.h"
44 #include "libavutil/intreadwrite.h"
45 #include "libavutil/lfg.h"
46 #include "libavutil/mastering_display_metadata.h"
47 #include "libavutil/mathematics.h"
48 #include "libavutil/opt.h"
49 #include "libavutil/parseutils.h"
50 #include "libavutil/random_seed.h"
51 #include "libavutil/rational.h"
52 #include "libavutil/samplefmt.h"
53 #include "libavutil/sha.h"
54 #include "libavutil/stereo3d.h"
56 #include "libavcodec/xiph.h"
57 #include "libavcodec/mpeg4audio.h"
58 #include "libavcodec/internal.h"
60 typedef struct ebml_master {
61 int64_t pos; ///< absolute offset in the file where the master's elements start
62 int sizebytes; ///< how many bytes were reserved for the size
65 typedef struct mkv_seekhead_entry {
66 unsigned int elementid;
70 typedef struct mkv_seekhead {
72 int64_t segment_offset; ///< the file offset to the beginning of the segment
73 int reserved_size; ///< -1 if appending to file
75 mkv_seekhead_entry *entries;
79 typedef struct mkv_cuepoint {
83 int64_t cluster_pos; ///< file offset of the cluster containing the block
84 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
85 int64_t duration; ///< duration of the block according to time base
88 typedef struct mkv_cues {
89 int64_t segment_offset;
90 mkv_cuepoint *entries;
94 typedef struct mkv_track {
98 int64_t sample_rate_offset;
99 int64_t codecpriv_offset;
103 typedef struct mkv_attachment {
108 typedef struct mkv_attachments {
109 mkv_attachment *entries;
113 #define MODE_MATROSKAv2 0x01
114 #define MODE_WEBM 0x02
116 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
117 * range 1 to 126 (inclusive) */
118 #define MAX_TRACKS 126
120 typedef struct MatroskaMuxContext {
121 const AVClass *class;
124 AVIOContext *tags_bc;
126 AVIOContext *info_bc;
128 AVIOContext *tracks_bc;
129 ebml_master tracks_master;
131 int64_t segment_offset;
133 int64_t cluster_pos; ///< file offset of the current cluster
135 int64_t duration_offset;
137 mkv_seekhead *main_seekhead;
140 mkv_attachments *attachments;
142 AVPacket cur_audio_pkt;
144 int have_attachments;
147 int reserve_cues_space;
148 int cluster_size_limit;
150 int64_t cluster_time_limit;
152 int dash_track_number;
156 uint32_t chapter_id_offset;
159 int64_t last_track_timestamp[MAX_TRACKS];
161 int64_t* stream_durations;
162 int64_t* stream_duration_offsets;
165 } MatroskaMuxContext;
168 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
169 * offset, 4 bytes for target EBML ID */
170 #define MAX_SEEKENTRY_SIZE 21
172 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
174 #define MAX_CUETRACKPOS_SIZE 42
176 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
177 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
179 /** Seek preroll value for opus */
180 #define OPUS_SEEK_PREROLL 80000000
182 static int ebml_id_size(unsigned int id)
184 return (av_log2(id + 1) - 1) / 7 + 1;
187 static void put_ebml_id(AVIOContext *pb, unsigned int id)
189 int i = ebml_id_size(id);
191 avio_w8(pb, (uint8_t)(id >> (i * 8)));
195 * Write an EBML size meaning "unknown size".
197 * @param bytes The number of bytes the size should occupy (maximum: 8).
199 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
201 av_assert0(bytes <= 8);
202 avio_w8(pb, 0x1ff >> bytes);
203 ffio_fill(pb, 0xff, bytes - 1);
207 * Calculate how many bytes are needed to represent a given number in EBML.
209 static int ebml_num_size(uint64_t num)
212 while ((num + 1) >> bytes * 7)
218 * Write a number in EBML variable length format.
220 * @param bytes The number of bytes that need to be used to write the number.
221 * If zero, any number of bytes can be used.
223 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
225 int i, needed_bytes = ebml_num_size(num);
227 // sizes larger than this are currently undefined in EBML
228 av_assert0(num < (1ULL << 56) - 1);
231 // don't care how many bytes are used, so use the min
232 bytes = needed_bytes;
233 // the bytes needed to write the given size would exceed the bytes
234 // that we need to use, so write unknown size. This shouldn't happen.
235 av_assert0(bytes >= needed_bytes);
237 num |= 1ULL << bytes * 7;
238 for (i = bytes - 1; i >= 0; i--)
239 avio_w8(pb, (uint8_t)(num >> i * 8));
242 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
249 put_ebml_id(pb, elementid);
250 put_ebml_num(pb, bytes, 0);
251 for (i = bytes - 1; i >= 0; i--)
252 avio_w8(pb, (uint8_t)(val >> i * 8));
255 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
258 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
260 while (tmp>>=8) bytes++;
262 put_ebml_id(pb, elementid);
263 put_ebml_num(pb, bytes, 0);
264 for (i = bytes - 1; i >= 0; i--)
265 avio_w8(pb, (uint8_t)(val >> i * 8));
268 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
270 put_ebml_id(pb, elementid);
271 put_ebml_num(pb, 8, 0);
272 avio_wb64(pb, av_double2int(val));
275 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
276 const void *buf, int size)
278 put_ebml_id(pb, elementid);
279 put_ebml_num(pb, size, 0);
280 avio_write(pb, buf, size);
283 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
286 put_ebml_binary(pb, elementid, str, strlen(str));
290 * Write a void element of a given size. Useful for reserving space in
291 * the file to be written to later.
293 * @param size The number of bytes to reserve, which must be at least 2.
295 static void put_ebml_void(AVIOContext *pb, uint64_t size)
297 int64_t currentpos = avio_tell(pb);
299 av_assert0(size >= 2);
301 put_ebml_id(pb, EBML_ID_VOID);
302 // we need to subtract the length needed to store the size from the
303 // size we need to reserve so 2 cases, we use 8 bytes to store the
304 // size if possible, 1 byte otherwise
306 put_ebml_num(pb, size - 2, 0);
308 put_ebml_num(pb, size - 9, 8);
309 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
312 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
313 uint64_t expectedsize)
315 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
316 put_ebml_id(pb, elementid);
317 put_ebml_size_unknown(pb, bytes);
318 return (ebml_master) {avio_tell(pb), bytes };
321 static void end_ebml_master(AVIOContext *pb, ebml_master master)
323 int64_t pos = avio_tell(pb);
325 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
327 put_ebml_num(pb, pos - master.pos, master.sizebytes);
328 avio_seek(pb, pos, SEEK_SET);
331 static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
332 ebml_master *master, unsigned int elementid, uint64_t expectedsize)
336 if ((ret = avio_open_dyn_buf(dyn_cp)) < 0)
339 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
340 *master = start_ebml_master(pb, elementid, expectedsize);
341 if (mkv->write_crc && mkv->mode != MODE_WEBM)
342 put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
344 *master = start_ebml_master(*dyn_cp, elementid, expectedsize);
349 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
352 uint8_t *buf, crc[4];
355 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
356 size = avio_close_dyn_buf(*dyn_cp, &buf);
357 if (mkv->write_crc && mkv->mode != MODE_WEBM) {
358 skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
359 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
360 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
362 avio_write(pb, buf + skip, size - skip);
363 end_ebml_master(pb, master);
365 end_ebml_master(*dyn_cp, master);
366 size = avio_close_dyn_buf(*dyn_cp, &buf);
367 avio_write(pb, buf, size);
374 * Complete ebml master whithout destroying the buffer, allowing for later updates
376 static void end_ebml_master_crc32_preliminary(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
379 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
382 int size = avio_get_dyn_buf(*dyn_cp, &buf);
384 avio_write(pb, buf, size);
385 end_ebml_master(pb, master);
389 static void put_xiph_size(AVIOContext *pb, int size)
391 ffio_fill(pb, 255, size / 255);
392 avio_w8(pb, size % 255);
396 * Free the members allocated in the mux context.
398 static void mkv_free(MatroskaMuxContext *mkv) {
401 avio_close_dyn_buf(mkv->dyn_bc, &buf);
405 avio_close_dyn_buf(mkv->info_bc, &buf);
408 if (mkv->tracks_bc) {
409 avio_close_dyn_buf(mkv->tracks_bc, &buf);
413 avio_close_dyn_buf(mkv->tags_bc, &buf);
416 if (mkv->main_seekhead) {
417 av_freep(&mkv->main_seekhead->entries);
418 av_freep(&mkv->main_seekhead);
421 av_freep(&mkv->cues->entries);
422 av_freep(&mkv->cues);
424 if (mkv->attachments) {
425 av_freep(&mkv->attachments->entries);
426 av_freep(&mkv->attachments);
428 av_freep(&mkv->tracks);
429 av_freep(&mkv->stream_durations);
430 av_freep(&mkv->stream_duration_offsets);
434 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
435 * elements. If a maximum number of elements is specified, enough space
436 * will be reserved at the current file location to write a seek head of
439 * @param segment_offset The absolute offset to the position in the file
440 * where the segment begins.
441 * @param numelements The maximum number of elements that will be indexed
442 * by this seek head, 0 if unlimited.
444 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
447 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
451 new_seekhead->segment_offset = segment_offset;
453 if (numelements > 0) {
454 new_seekhead->filepos = avio_tell(pb);
455 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
456 // and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
457 // that an EBML void element will fit afterwards
458 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
459 new_seekhead->max_entries = numelements;
460 put_ebml_void(pb, new_seekhead->reserved_size);
465 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
467 mkv_seekhead_entry *entries = seekhead->entries;
469 // don't store more elements than we reserved space for
470 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
473 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
475 return AVERROR(ENOMEM);
476 seekhead->entries = entries;
478 seekhead->entries[seekhead->num_entries].elementid = elementid;
479 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
485 * Write the seek head to the file and free it. If a maximum number of
486 * elements was specified to mkv_start_seekhead(), the seek head will
487 * be written at the location reserved for it. Otherwise, it is written
488 * at the current location in the file.
490 * @return The file offset where the seekhead was written,
491 * -1 if an error occurred.
493 static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
496 mkv_seekhead *seekhead = mkv->main_seekhead;
497 ebml_master metaseek, seekentry;
501 currentpos = avio_tell(pb);
503 if (seekhead->reserved_size > 0) {
504 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
510 if (start_ebml_master_crc32(pb, &dyn_cp, mkv, &metaseek, MATROSKA_ID_SEEKHEAD,
511 seekhead->reserved_size) < 0) {
516 for (i = 0; i < seekhead->num_entries; i++) {
517 mkv_seekhead_entry *entry = &seekhead->entries[i];
519 seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
521 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
522 put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
523 put_ebml_id(dyn_cp, entry->elementid);
525 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
526 end_ebml_master(dyn_cp, seekentry);
528 end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
530 if (seekhead->reserved_size > 0) {
531 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
532 put_ebml_void(pb, remaining);
533 avio_seek(pb, currentpos, SEEK_SET);
535 currentpos = seekhead->filepos;
538 av_freep(&mkv->main_seekhead->entries);
539 av_freep(&mkv->main_seekhead);
544 static mkv_cues *mkv_start_cues(int64_t segment_offset)
546 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
550 cues->segment_offset = segment_offset;
554 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
555 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
557 mkv_cuepoint *entries = cues->entries;
562 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
564 return AVERROR(ENOMEM);
565 cues->entries = entries;
567 cues->entries[cues->num_entries].pts = ts;
568 cues->entries[cues->num_entries].stream_idx = stream;
569 cues->entries[cues->num_entries].tracknum = tracknum;
570 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
571 cues->entries[cues->num_entries].relative_pos = relative_pos;
572 cues->entries[cues->num_entries++].duration = duration;
577 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
579 MatroskaMuxContext *mkv = s->priv_data;
580 AVIOContext *dyn_cp, *pb = s->pb;
581 ebml_master cues_element;
585 currentpos = avio_tell(pb);
586 ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &cues_element, MATROSKA_ID_CUES, 0);
590 for (i = 0; i < cues->num_entries; i++) {
591 ebml_master cuepoint, track_positions;
592 mkv_cuepoint *entry = &cues->entries[i];
593 uint64_t pts = entry->pts;
596 // Calculate the number of entries, so we know the element size
597 for (j = 0; j < num_tracks; j++)
598 tracks[j].has_cue = 0;
599 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
600 int tracknum = entry[j].stream_idx;
601 av_assert0(tracknum>=0 && tracknum<num_tracks);
602 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
604 tracks[tracknum].has_cue = 1;
608 cuepoint = start_ebml_master(dyn_cp, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
609 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETIME, pts);
611 // put all the entries from different tracks that have the exact same
612 // timestamp into the same CuePoint
613 for (j = 0; j < num_tracks; j++)
614 tracks[j].has_cue = 0;
615 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
616 int tracknum = entry[j].stream_idx;
617 av_assert0(tracknum>=0 && tracknum<num_tracks);
618 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
620 tracks[tracknum].has_cue = 1;
621 track_positions = start_ebml_master(dyn_cp, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
622 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETRACK , entry[j].tracknum );
623 put_ebml_uint(dyn_cp, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
624 put_ebml_uint(dyn_cp, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
625 if (entry[j].duration != -1)
626 put_ebml_uint(dyn_cp, MATROSKA_ID_CUEDURATION , entry[j].duration);
627 end_ebml_master(dyn_cp, track_positions);
630 end_ebml_master(dyn_cp, cuepoint);
632 end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
637 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
639 const uint8_t *header_start[3];
641 int first_header_size;
644 if (par->codec_id == AV_CODEC_ID_VORBIS)
645 first_header_size = 30;
647 first_header_size = 42;
649 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
650 first_header_size, header_start, header_len) < 0) {
651 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
655 avio_w8(pb, 2); // number packets - 1
656 for (j = 0; j < 2; j++) {
657 put_xiph_size(pb, header_len[j]);
659 for (j = 0; j < 3; j++)
660 avio_write(pb, header_start[j], header_len[j]);
665 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
667 if (par->extradata && par->extradata_size == 2)
668 avio_write(pb, par->extradata, 2);
670 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
674 static int put_flac_codecpriv(AVFormatContext *s,
675 AVIOContext *pb, AVCodecParameters *par)
677 int write_comment = (par->channel_layout &&
678 !(par->channel_layout & ~0x3ffffULL) &&
679 !ff_flac_is_native_layout(par->channel_layout));
680 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
687 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
688 "Lavf" : LIBAVFORMAT_IDENT;
689 AVDictionary *dict = NULL;
690 uint8_t buf[32], *data, *p;
693 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
694 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
696 len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
697 if (len >= ((1<<24) - 4)) {
699 return AVERROR(EINVAL);
702 data = av_malloc(len + 4);
705 return AVERROR(ENOMEM);
709 AV_WB24(data + 1, len);
712 ff_vorbiscomment_write(&p, &dict, vendor, NULL, 0);
714 avio_write(pb, data, len + 4);
723 static int get_aac_sample_rates(AVFormatContext *s, uint8_t *extradata, int extradata_size,
724 int *sample_rate, int *output_sample_rate)
726 MPEG4AudioConfig mp4ac;
729 ret = avpriv_mpeg4audio_get_config(&mp4ac, extradata,
730 extradata_size * 8, 1);
731 /* Don't abort if the failure is because of missing extradata. Assume in that
732 * case a bitstream filter will provide the muxer with the extradata in the
734 * Abort however if s->pb is not seekable, as we would not be able to seek back
735 * to write the sample rate elements once the extradata shows up, anyway. */
736 if (ret < 0 && (extradata_size || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL))) {
737 av_log(s, AV_LOG_ERROR,
738 "Error parsing AAC extradata, unable to determine samplerate.\n");
739 return AVERROR(EINVAL);
743 /* This will only happen when this function is called while writing the
744 * header and no extradata is available. The space for this element has
745 * to be reserved for when this function is called again after the
746 * extradata shows up in the first packet, as there's no way to know if
747 * output_sample_rate will be different than sample_rate or not. */
748 *output_sample_rate = *sample_rate;
750 *sample_rate = mp4ac.sample_rate;
751 *output_sample_rate = mp4ac.ext_sample_rate;
756 static int mkv_write_native_codecprivate(AVFormatContext *s, AVIOContext *pb,
757 AVCodecParameters *par,
760 switch (par->codec_id) {
761 case AV_CODEC_ID_VORBIS:
762 case AV_CODEC_ID_THEORA:
763 return put_xiph_codecpriv(s, dyn_cp, par);
764 case AV_CODEC_ID_FLAC:
765 return put_flac_codecpriv(s, dyn_cp, par);
766 case AV_CODEC_ID_WAVPACK:
767 return put_wv_codecpriv(dyn_cp, par);
768 case AV_CODEC_ID_H264:
769 return ff_isom_write_avcc(dyn_cp, par->extradata,
770 par->extradata_size);
771 case AV_CODEC_ID_HEVC:
772 ff_isom_write_hvcc(dyn_cp, par->extradata,
773 par->extradata_size, 0);
775 case AV_CODEC_ID_AV1:
776 if (par->extradata_size)
777 return ff_isom_write_av1c(dyn_cp, par->extradata,
778 par->extradata_size);
780 put_ebml_void(pb, 4 + 3);
782 case AV_CODEC_ID_ALAC:
783 if (par->extradata_size < 36) {
784 av_log(s, AV_LOG_ERROR,
785 "Invalid extradata found, ALAC expects a 36-byte "
787 return AVERROR_INVALIDDATA;
789 avio_write(dyn_cp, par->extradata + 12,
790 par->extradata_size - 12);
792 case AV_CODEC_ID_AAC:
793 if (par->extradata_size)
794 avio_write(dyn_cp, par->extradata, par->extradata_size);
796 put_ebml_void(pb, MAX_PCE_SIZE + 2 + 4);
799 if (par->codec_id == AV_CODEC_ID_PRORES &&
800 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
801 avio_wl32(dyn_cp, par->codec_tag);
802 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
803 avio_write(dyn_cp, par->extradata, par->extradata_size);
809 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
810 AVCodecParameters *par,
811 int native_id, int qt_id)
815 int ret, codecpriv_size;
817 ret = avio_open_dyn_buf(&dyn_cp);
822 ret = mkv_write_native_codecprivate(s, pb, par, dyn_cp);
823 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
826 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
828 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
829 && (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
832 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
833 avio_wl32(dyn_cp, par->codec_tag);
834 for(i = 0; i < 0x5a - 8; i++)
837 avio_write(dyn_cp, par->extradata, par->extradata_size);
839 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
840 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
841 avcodec_get_name(par->codec_id));
844 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
846 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
847 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
848 avcodec_get_name(par->codec_id));
849 ret = AVERROR(EINVAL);
852 ff_put_bmp_header(dyn_cp, par, 0, 0);
854 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
856 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
858 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
859 avcodec_get_name(par->codec_id));
860 ret = AVERROR(EINVAL);
863 par->codec_tag = tag;
865 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
868 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
870 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
876 static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
878 uint8_t *colorinfo_ptr;
879 int side_data_size = 0;
880 int ret, colorinfo_size;
881 const uint8_t *side_data;
883 ret = avio_open_dyn_buf(&dyn_cp);
887 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
888 par->color_trc < AVCOL_TRC_NB) {
889 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
892 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
893 par->color_space < AVCOL_SPC_NB) {
894 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
896 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
897 par->color_primaries < AVCOL_PRI_NB) {
898 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
900 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
901 par->color_range < AVCOL_RANGE_NB) {
902 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
904 if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
905 par->chroma_location <= AVCHROMA_LOC_TOP) {
908 avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
909 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
910 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
913 side_data = av_stream_get_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
915 if (side_data_size) {
916 const AVContentLightMetadata *metadata =
917 (const AVContentLightMetadata*)side_data;
918 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXCLL, metadata->MaxCLL);
919 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXFALL, metadata->MaxFALL);
922 side_data = av_stream_get_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
924 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
925 ebml_master meta_element = start_ebml_master(
926 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
927 const AVMasteringDisplayMetadata *metadata =
928 (const AVMasteringDisplayMetadata*)side_data;
929 if (metadata->has_primaries) {
930 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
931 av_q2d(metadata->display_primaries[0][0]));
932 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
933 av_q2d(metadata->display_primaries[0][1]));
934 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
935 av_q2d(metadata->display_primaries[1][0]));
936 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
937 av_q2d(metadata->display_primaries[1][1]));
938 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
939 av_q2d(metadata->display_primaries[2][0]));
940 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
941 av_q2d(metadata->display_primaries[2][1]));
942 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
943 av_q2d(metadata->white_point[0]));
944 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
945 av_q2d(metadata->white_point[1]));
947 if (metadata->has_luminance) {
948 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
949 av_q2d(metadata->max_luminance));
950 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
951 av_q2d(metadata->min_luminance));
953 end_ebml_master(dyn_cp, meta_element);
956 colorinfo_size = avio_close_dyn_buf(dyn_cp, &colorinfo_ptr);
957 if (colorinfo_size) {
958 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, colorinfo_size);
959 avio_write(pb, colorinfo_ptr, colorinfo_size);
960 end_ebml_master(pb, colorinfo);
962 av_free(colorinfo_ptr);
966 static int mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
971 int side_data_size = 0;
972 int ret, projection_size;
973 uint8_t *projection_ptr;
976 const AVSphericalMapping *spherical =
977 (const AVSphericalMapping *)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
983 ret = avio_open_dyn_buf(&dyn_cp);
987 switch (spherical->projection) {
988 case AV_SPHERICAL_EQUIRECTANGULAR:
989 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
990 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
992 case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
993 ffio_init_context(&b, private, 20, 1, NULL, NULL, NULL, NULL);
994 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
995 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
996 avio_wb32(&b, 0); // version + flags
997 avio_wb32(&b, spherical->bound_top);
998 avio_wb32(&b, spherical->bound_bottom);
999 avio_wb32(&b, spherical->bound_left);
1000 avio_wb32(&b, spherical->bound_right);
1001 put_ebml_binary(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
1002 private, avio_tell(&b));
1004 case AV_SPHERICAL_CUBEMAP:
1005 ffio_init_context(&b, private, 12, 1, NULL, NULL, NULL, NULL);
1006 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
1007 MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
1008 avio_wb32(&b, 0); // version + flags
1009 avio_wb32(&b, 0); // layout
1010 avio_wb32(&b, spherical->padding);
1011 put_ebml_binary(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
1012 private, avio_tell(&b));
1015 av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
1020 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW,
1021 (double) spherical->yaw / (1 << 16));
1022 if (spherical->pitch)
1023 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH,
1024 (double) spherical->pitch / (1 << 16));
1025 if (spherical->roll)
1026 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL,
1027 (double) spherical->roll / (1 << 16));
1030 projection_size = avio_close_dyn_buf(dyn_cp, &projection_ptr);
1031 if (projection_size) {
1032 ebml_master projection = start_ebml_master(pb,
1033 MATROSKA_ID_VIDEOPROJECTION,
1035 avio_write(pb, projection_ptr, projection_size);
1036 end_ebml_master(pb, projection);
1038 av_freep(&projection_ptr);
1043 static void mkv_write_field_order(AVIOContext *pb, int mode,
1044 enum AVFieldOrder field_order)
1046 switch (field_order) {
1047 case AV_FIELD_UNKNOWN:
1049 case AV_FIELD_PROGRESSIVE:
1050 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1051 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
1057 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1058 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
1059 if (mode != MODE_WEBM) {
1060 switch (field_order) {
1062 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1063 MATROSKA_VIDEO_FIELDORDER_TT);
1066 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1067 MATROSKA_VIDEO_FIELDORDER_BB);
1070 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1071 MATROSKA_VIDEO_FIELDORDER_TB);
1074 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1075 MATROSKA_VIDEO_FIELDORDER_BT);
1082 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
1083 AVStream *st, int mode, int *h_width, int *h_height)
1087 AVDictionaryEntry *tag;
1088 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1092 // convert metadata into proper side data and add it to the stream
1093 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
1094 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
1095 int stereo_mode = atoi(tag->value);
1097 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
1098 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
1103 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1104 stereo_mode != 10 && stereo_mode != 12) {
1105 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
1111 // iterate to find the stereo3d side data
1112 for (i = 0; i < st->nb_side_data; i++) {
1113 AVPacketSideData sd = st->side_data[i];
1114 if (sd.type == AV_PKT_DATA_STEREO3D) {
1115 AVStereo3D *stereo = (AVStereo3D *)sd.data;
1117 switch (stereo->type) {
1118 case AV_STEREO3D_2D:
1119 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
1121 case AV_STEREO3D_SIDEBYSIDE:
1122 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1123 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
1124 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
1127 case AV_STEREO3D_TOPBOTTOM:
1128 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
1129 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1133 case AV_STEREO3D_CHECKERBOARD:
1134 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
1135 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1138 case AV_STEREO3D_LINES:
1139 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
1140 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1144 case AV_STEREO3D_COLUMNS:
1145 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
1146 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1150 case AV_STEREO3D_FRAMESEQUENCE:
1151 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
1152 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1160 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1163 // if webm, do not write unsupported modes
1164 if ((mode == MODE_WEBM &&
1165 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
1166 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
1167 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
1168 av_log(s, AV_LOG_ERROR,
1169 "The specified stereo mode is not valid.\n");
1170 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1171 return AVERROR(EINVAL);
1174 // write StereoMode if format is valid
1175 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1180 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1181 int i, AVIOContext *pb, int default_stream_exists)
1183 AVStream *st = s->streams[i];
1184 AVCodecParameters *par = st->codecpar;
1185 ebml_master subinfo, track;
1188 int bit_depth = av_get_bits_per_sample(par->codec_id);
1189 int sample_rate = par->sample_rate;
1190 int output_sample_rate = 0;
1191 int display_width_div = 1;
1192 int display_height_div = 1;
1194 AVDictionaryEntry *tag;
1196 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1197 mkv->have_attachments = 1;
1201 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
1202 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1203 if (par->bits_per_raw_sample)
1204 bit_depth = par->bits_per_raw_sample;
1206 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1209 bit_depth = par->bits_per_coded_sample;
1212 if (par->codec_id == AV_CODEC_ID_AAC) {
1213 ret = get_aac_sample_rates(s, par->extradata, par->extradata_size, &sample_rate,
1214 &output_sample_rate);
1219 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1220 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1221 mkv->is_dash ? mkv->dash_track_number : i + 1);
1222 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1223 mkv->is_dash ? mkv->dash_track_number : i + 1);
1224 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1226 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1227 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1228 tag = av_dict_get(st->metadata, "language", NULL, 0);
1229 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1230 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
1231 } else if (tag && tag->value) {
1232 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
1235 // The default value for TRACKFLAGDEFAULT is 1, so add element
1236 // if we need to clear it.
1237 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1238 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1240 if (st->disposition & AV_DISPOSITION_FORCED)
1241 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1243 if (mkv->mode == MODE_WEBM) {
1244 const char *codec_id;
1245 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1246 for (j = 0; ff_webm_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1247 if (ff_webm_codec_tags[j].id == par->codec_id) {
1248 codec_id = ff_webm_codec_tags[j].str;
1253 } else if (par->codec_id == AV_CODEC_ID_WEBVTT) {
1254 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1255 codec_id = "D_WEBVTT/CAPTIONS";
1256 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1257 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1258 codec_id = "D_WEBVTT/DESCRIPTIONS";
1259 native_id = MATROSKA_TRACK_TYPE_METADATA;
1260 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1261 codec_id = "D_WEBVTT/METADATA";
1262 native_id = MATROSKA_TRACK_TYPE_METADATA;
1264 codec_id = "D_WEBVTT/SUBTITLES";
1265 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1270 av_log(s, AV_LOG_ERROR,
1271 "Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1272 return AVERROR(EINVAL);
1275 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1277 // look for a codec ID string specific to mkv to use,
1278 // if none are found, use AVI codes
1279 if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
1280 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1281 if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
1282 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1288 if (mkv->allow_raw_vfw) {
1291 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1292 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1293 return AVERROR(EINVAL);
1298 if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1299 int64_t codecdelay = av_rescale_q(par->initial_padding,
1300 (AVRational){ 1, 48000 },
1301 (AVRational){ 1, 1000000000 });
1302 if (codecdelay < 0) {
1303 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1304 return AVERROR(EINVAL);
1306 // mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1307 // (AVRational){ 1, par->sample_rate },
1310 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1312 if (par->codec_id == AV_CODEC_ID_OPUS) {
1313 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1316 switch (par->codec_type) {
1317 case AVMEDIA_TYPE_VIDEO:
1318 mkv->have_video = 1;
1319 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1321 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1322 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1323 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1326 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1327 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1328 par->codec_id == AV_CODEC_ID_SVQ1 ||
1329 par->codec_id == AV_CODEC_ID_SVQ3 ||
1330 par->codec_id == AV_CODEC_ID_CINEPAK))
1334 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1335 else if (!native_id) {
1336 // if there is no mkv-specific codec ID, use VFW mode
1337 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1338 mkv->tracks[i].write_dts = 1;
1339 s->internal->avoid_negative_ts_use_pts = 0;
1342 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1344 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1345 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1347 mkv_write_field_order(pb, mkv->mode, par->field_order);
1349 // check both side data and metadata for stereo information,
1350 // write the result to the bitstream if any is found
1351 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1353 &display_height_div);
1357 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1358 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1359 (par->format == AV_PIX_FMT_YUVA420P)) {
1360 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1363 // write DisplayWidth and DisplayHeight, they contain the size of
1364 // a single source view and/or the display aspect ratio
1365 if (st->sample_aspect_ratio.num) {
1366 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1367 if (d_width > INT_MAX) {
1368 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1369 return AVERROR(EINVAL);
1371 if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
1372 if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
1373 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1374 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1376 AVRational display_aspect_ratio;
1377 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
1378 par->width * (int64_t)st->sample_aspect_ratio.num,
1379 par->height * (int64_t)st->sample_aspect_ratio.den,
1381 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
1382 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
1383 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
1386 } else if (display_width_div != 1 || display_height_div != 1) {
1387 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1388 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1389 } else if (mkv->mode != MODE_WEBM)
1390 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1392 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1393 uint32_t color_space = av_le2ne32(par->codec_tag);
1394 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1396 ret = mkv_write_video_color(pb, par, st);
1399 ret = mkv_write_video_projection(s, pb, st);
1402 end_ebml_master(pb, subinfo);
1405 case AVMEDIA_TYPE_AUDIO:
1406 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1409 // no mkv-specific ID, use ACM mode
1410 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1412 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1413 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1415 mkv->tracks[i].sample_rate_offset = avio_tell(pb);
1416 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1417 if (output_sample_rate)
1418 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1420 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1421 end_ebml_master(pb, subinfo);
1424 case AVMEDIA_TYPE_SUBTITLE:
1426 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1427 return AVERROR(ENOSYS);
1430 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1431 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1433 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1436 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1437 return AVERROR(EINVAL);
1440 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1441 mkv->tracks[i].codecpriv_offset = avio_tell(pb);
1442 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1447 end_ebml_master(pb, track);
1452 static int mkv_write_tracks(AVFormatContext *s)
1454 MatroskaMuxContext *mkv = s->priv_data;
1455 AVIOContext *pb = s->pb;
1456 int i, ret, default_stream_exists = 0;
1458 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1462 ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, &mkv->tracks_master, MATROSKA_ID_TRACKS, 0);
1466 for (i = 0; i < s->nb_streams; i++) {
1467 AVStream *st = s->streams[i];
1468 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1470 for (i = 0; i < s->nb_streams; i++) {
1471 ret = mkv_write_track(s, mkv, i, mkv->tracks_bc, default_stream_exists);
1476 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1477 end_ebml_master_crc32_preliminary(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
1479 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
1484 static int mkv_write_chapters(AVFormatContext *s)
1486 MatroskaMuxContext *mkv = s->priv_data;
1487 AVIOContext *dyn_cp, *pb = s->pb;
1488 ebml_master chapters, editionentry;
1489 AVRational scale = {1, 1E9};
1492 if (!s->nb_chapters || mkv->wrote_chapters)
1495 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1496 if (ret < 0) return ret;
1498 ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &chapters, MATROSKA_ID_CHAPTERS, 0);
1499 if (ret < 0) return ret;
1501 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1502 if (mkv->mode != MODE_WEBM) {
1503 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1504 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1506 for (i = 0; i < s->nb_chapters; i++) {
1507 ebml_master chapteratom, chapterdisplay;
1508 AVChapter *c = s->chapters[i];
1509 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1510 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1511 AVDictionaryEntry *t = NULL;
1512 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1513 av_log(s, AV_LOG_ERROR,
1514 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1515 chapterstart, chapterend);
1516 return AVERROR_INVALIDDATA;
1519 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1520 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1521 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1522 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1523 if (mkv->mode != MODE_WEBM) {
1524 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1525 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1527 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1528 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1529 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1530 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1531 end_ebml_master(dyn_cp, chapterdisplay);
1533 end_ebml_master(dyn_cp, chapteratom);
1535 end_ebml_master(dyn_cp, editionentry);
1536 end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
1538 mkv->wrote_chapters = 1;
1542 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1544 uint8_t *key = av_strdup(t->key);
1546 const uint8_t *lang = NULL;
1550 return AVERROR(ENOMEM);
1552 if ((p = strrchr(p, '-')) &&
1553 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1560 else if (*p >= 'a' && *p <= 'z')
1565 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1566 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1568 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1569 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1570 end_ebml_master(pb, tag);
1576 static int mkv_write_tag_targets(AVFormatContext *s,
1577 unsigned int elementid, unsigned int uid,
1578 ebml_master *tags, ebml_master* tag)
1581 MatroskaMuxContext *mkv = s->priv_data;
1582 ebml_master targets;
1586 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1587 if (ret < 0) return ret;
1589 start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, tags, MATROSKA_ID_TAGS, 0);
1593 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1594 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1596 put_ebml_uint(pb, elementid, uid);
1597 end_ebml_master(pb, targets);
1601 static int mkv_check_tag_name(const char *name, unsigned int elementid)
1603 return av_strcasecmp(name, "title") &&
1604 av_strcasecmp(name, "stereo_mode") &&
1605 av_strcasecmp(name, "creation_time") &&
1606 av_strcasecmp(name, "encoding_tool") &&
1607 av_strcasecmp(name, "duration") &&
1608 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1609 av_strcasecmp(name, "language")) &&
1610 (elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1611 (av_strcasecmp(name, "filename") &&
1612 av_strcasecmp(name, "mimetype")));
1615 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1616 unsigned int uid, ebml_master *tags)
1618 MatroskaMuxContext *mkv = s->priv_data;
1621 AVDictionaryEntry *t = NULL;
1623 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1627 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1628 if (mkv_check_tag_name(t->key, elementid)) {
1629 ret = mkv_write_simpletag(mkv->tags_bc, t);
1635 end_ebml_master(mkv->tags_bc, tag);
1639 static int mkv_check_tag(AVDictionary *m, unsigned int elementid)
1641 AVDictionaryEntry *t = NULL;
1643 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1644 if (mkv_check_tag_name(t->key, elementid))
1650 static int mkv_write_tags(AVFormatContext *s)
1652 MatroskaMuxContext *mkv = s->priv_data;
1655 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1657 if (mkv_check_tag(s->metadata, 0)) {
1658 ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
1659 if (ret < 0) return ret;
1662 for (i = 0; i < s->nb_streams; i++) {
1663 AVStream *st = s->streams[i];
1665 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1668 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1671 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
1672 if (ret < 0) return ret;
1675 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
1676 for (i = 0; i < s->nb_streams; i++) {
1678 AVStream *st = s->streams[i];
1679 ebml_master tag_target;
1682 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1685 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
1688 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1689 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1690 mkv->stream_duration_offsets[i] = avio_tell(pb);
1692 // Reserve space to write duration as a 20-byte string.
1693 // 2 (ebml id) + 1 (data size) + 20 (data)
1694 put_ebml_void(pb, 23);
1695 end_ebml_master(pb, tag);
1696 end_ebml_master(pb, tag_target);
1700 if (mkv->mode != MODE_WEBM) {
1701 for (i = 0; i < s->nb_chapters; i++) {
1702 AVChapter *ch = s->chapters[i];
1704 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1707 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
1713 if (mkv->have_attachments && mkv->mode != MODE_WEBM) {
1714 for (i = 0; i < mkv->attachments->num_entries; i++) {
1715 mkv_attachment *attachment = &mkv->attachments->entries[i];
1716 AVStream *st = s->streams[attachment->stream_idx];
1718 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1721 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid, &mkv->tags);
1727 if (mkv->tags.pos) {
1728 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1729 end_ebml_master_crc32_preliminary(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1731 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1736 static int mkv_write_attachments(AVFormatContext *s)
1738 MatroskaMuxContext *mkv = s->priv_data;
1739 AVIOContext *dyn_cp, *pb = s->pb;
1740 ebml_master attachments;
1744 if (!mkv->have_attachments)
1747 mkv->attachments = av_mallocz(sizeof(*mkv->attachments));
1748 if (!mkv->attachments)
1749 return AVERROR(ENOMEM);
1751 av_lfg_init(&c, av_get_random_seed());
1753 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1754 if (ret < 0) return ret;
1756 ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &attachments, MATROSKA_ID_ATTACHMENTS, 0);
1757 if (ret < 0) return ret;
1759 for (i = 0; i < s->nb_streams; i++) {
1760 AVStream *st = s->streams[i];
1761 ebml_master attached_file;
1762 mkv_attachment *attachment = mkv->attachments->entries;
1763 AVDictionaryEntry *t;
1764 const char *mimetype = NULL;
1767 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1770 attachment = av_realloc_array(attachment, mkv->attachments->num_entries + 1, sizeof(mkv_attachment));
1772 return AVERROR(ENOMEM);
1773 mkv->attachments->entries = attachment;
1775 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1777 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1778 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1779 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1780 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1781 return AVERROR(EINVAL);
1783 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1784 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1785 mimetype = t->value;
1786 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1788 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1789 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1790 mimetype = ff_mkv_mime_tags[i].str;
1793 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1794 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1795 mimetype = ff_mkv_image_mime_tags[i].str;
1800 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1801 "it cannot be deduced from the codec id.\n", i);
1802 return AVERROR(EINVAL);
1805 if (s->flags & AVFMT_FLAG_BITEXACT) {
1806 struct AVSHA *sha = av_sha_alloc();
1809 return AVERROR(ENOMEM);
1810 av_sha_init(sha, 160);
1811 av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1812 av_sha_final(sha, digest);
1814 fileuid = AV_RL32(digest);
1816 fileuid = av_lfg_get(&c);
1818 av_log(s, AV_LOG_VERBOSE, "Using %.8"PRIx32" for attachment %d\n",
1819 fileuid, mkv->attachments->num_entries);
1821 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1822 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1823 put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1824 end_ebml_master(dyn_cp, attached_file);
1826 mkv->attachments->entries[mkv->attachments->num_entries].stream_idx = i;
1827 mkv->attachments->entries[mkv->attachments->num_entries++].fileuid = fileuid;
1829 end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
1834 static int64_t get_metadata_duration(AVFormatContext *s)
1840 AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1841 if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1842 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1846 for (i = 0; i < s->nb_streams; i++) {
1848 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1850 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1851 max = FFMAX(max, us);
1854 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1858 static int mkv_write_header(AVFormatContext *s)
1860 MatroskaMuxContext *mkv = s->priv_data;
1861 AVIOContext *pb = s->pb;
1862 ebml_master ebml_header;
1863 AVDictionaryEntry *tag;
1864 int ret, i, version = 2;
1865 int64_t creation_time;
1867 if (!strcmp(s->oformat->name, "webm"))
1868 mkv->mode = MODE_WEBM;
1870 mkv->mode = MODE_MATROSKAv2;
1872 if (mkv->mode != MODE_WEBM ||
1873 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1874 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1877 for (i = 0; i < s->nb_streams; i++) {
1878 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1879 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1880 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1884 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1886 ret = AVERROR(ENOMEM);
1889 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1890 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1891 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1892 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1893 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1894 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1895 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1896 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1897 end_ebml_master(pb, ebml_header);
1899 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1900 mkv->segment_offset = avio_tell(pb);
1902 // we write 2 seek heads - one at the end of the file to point to each
1903 // cluster, and one at the beginning to point to all other level one
1904 // elements (including the seek head at the end of the file), which
1905 // isn't more than 10 elements if we only write one of each other
1906 // currently defined level 1 element
1907 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1908 if (!mkv->main_seekhead) {
1909 ret = AVERROR(ENOMEM);
1913 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1914 if (ret < 0) goto fail;
1916 ret = start_ebml_master_crc32(pb, &mkv->info_bc, mkv, &mkv->info, MATROSKA_ID_INFO, 0);
1921 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1922 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1923 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1924 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1925 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1926 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1927 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1929 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1931 if (mkv->mode != MODE_WEBM) {
1932 uint32_t segment_uid[4];
1935 av_lfg_init(&lfg, av_get_random_seed());
1937 for (i = 0; i < 4; i++)
1938 segment_uid[i] = av_lfg_get(&lfg);
1940 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1943 const char *ident = "Lavf";
1944 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1945 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1948 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1949 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1950 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1951 uint8_t date_utc_buf[8];
1952 AV_WB64(date_utc_buf, date_utc);
1953 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1956 // reserve space for the duration
1958 mkv->duration_offset = avio_tell(pb);
1959 if (!mkv->is_live) {
1960 int64_t metadata_duration = get_metadata_duration(s);
1962 if (s->duration > 0) {
1963 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1964 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1965 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1966 } else if (metadata_duration > 0) {
1967 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1968 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1969 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1971 put_ebml_void(pb, 11); // assumes double-precision float to be written
1974 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1975 end_ebml_master_crc32_preliminary(s->pb, &mkv->info_bc, mkv, mkv->info);
1977 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
1980 // initialize stream_duration fields
1981 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1982 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1983 if (!mkv->stream_durations || !mkv->stream_duration_offsets) {
1984 ret = AVERROR(ENOMEM);
1988 ret = mkv_write_tracks(s);
1992 for (i = 0; i < s->nb_chapters; i++)
1993 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1995 ret = mkv_write_chapters(s);
1999 if (mkv->mode != MODE_WEBM) {
2000 ret = mkv_write_attachments(s);
2005 ret = mkv_write_tags(s);
2009 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
2010 mkv_write_seekhead(pb, mkv);
2012 mkv->cues = mkv_start_cues(mkv->segment_offset);
2014 ret = AVERROR(ENOMEM);
2018 if (s->metadata_header_padding > 0) {
2019 if (s->metadata_header_padding == 1)
2020 s->metadata_header_padding++;
2021 put_ebml_void(pb, s->metadata_header_padding);
2024 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && mkv->reserve_cues_space) {
2025 mkv->cues_pos = avio_tell(pb);
2026 if (mkv->reserve_cues_space == 1)
2027 mkv->reserve_cues_space++;
2028 put_ebml_void(pb, mkv->reserve_cues_space);
2031 av_init_packet(&mkv->cur_audio_pkt);
2032 mkv->cur_audio_pkt.size = 0;
2033 mkv->cluster_pos = -1;
2037 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2038 // after 4k and on a keyframe
2039 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
2040 if (mkv->cluster_time_limit < 0)
2041 mkv->cluster_time_limit = 5000;
2042 if (mkv->cluster_size_limit < 0)
2043 mkv->cluster_size_limit = 5 * 1024 * 1024;
2045 if (mkv->cluster_time_limit < 0)
2046 mkv->cluster_time_limit = 1000;
2047 if (mkv->cluster_size_limit < 0)
2048 mkv->cluster_size_limit = 32 * 1024;
2057 static int mkv_blockgroup_size(int pkt_size)
2059 int size = pkt_size + 4;
2060 size += ebml_num_size(size);
2061 size += 2; // EBML ID for block and block duration
2062 size += 8; // max size of block duration
2063 size += ebml_num_size(size);
2064 size += 1; // blockgroup EBML ID
2068 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
2075 dst = av_malloc(srclen);
2077 return AVERROR(ENOMEM);
2079 while (srclen >= WV_HEADER_SIZE) {
2082 ret = ff_wv_parse_header(&header, src);
2085 src += WV_HEADER_SIZE;
2086 srclen -= WV_HEADER_SIZE;
2088 if (srclen < header.blocksize) {
2089 ret = AVERROR_INVALIDDATA;
2093 if (header.initial) {
2094 AV_WL32(dst + offset, header.samples);
2097 AV_WL32(dst + offset, header.flags);
2098 AV_WL32(dst + offset + 4, header.crc);
2101 if (!(header.initial && header.final)) {
2102 AV_WL32(dst + offset, header.blocksize);
2106 memcpy(dst + offset, src, header.blocksize);
2107 src += header.blocksize;
2108 srclen -= header.blocksize;
2109 offset += header.blocksize;
2121 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
2122 unsigned int blockid, AVPacket *pkt, int keyframe)
2124 MatroskaMuxContext *mkv = s->priv_data;
2125 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2126 uint8_t *data = NULL, *side_data = NULL;
2127 int offset = 0, size = pkt->size, side_data_size = 0;
2128 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2129 uint64_t additional_id = 0;
2130 int64_t discard_padding = 0;
2131 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
2132 ebml_master block_group, block_additions, block_more;
2134 ts += mkv->tracks[pkt->stream_index].ts_offset;
2136 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2137 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
2138 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
2140 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
2141 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
2142 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
2143 else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
2144 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
2145 /* extradata is Annex B, assume the bitstream is too and convert it */
2146 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
2147 else if (par->codec_id == AV_CODEC_ID_AV1)
2148 ff_av1_filter_obus_buf(pkt->data, &data, &size);
2149 else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
2150 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
2152 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
2158 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
2159 /* Matroska specification requires to remove the first QuickTime atom
2165 side_data = av_packet_get_side_data(pkt,
2166 AV_PKT_DATA_SKIP_SAMPLES,
2169 if (side_data && side_data_size >= 10) {
2170 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
2171 (AVRational){1, par->sample_rate},
2172 (AVRational){1, 1000000000});
2175 side_data = av_packet_get_side_data(pkt,
2176 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2179 additional_id = AV_RB64(side_data);
2181 side_data_size -= 8;
2184 if ((side_data_size && additional_id == 1) || discard_padding) {
2185 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
2186 blockid = MATROSKA_ID_BLOCK;
2189 put_ebml_id(pb, blockid);
2190 put_ebml_num(pb, size + 4, 0);
2191 // this assumes stream_index is less than 126
2192 avio_w8(pb, 0x80 | track_number);
2193 avio_wb16(pb, ts - mkv->cluster_pts);
2194 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
2195 avio_write(pb, data + offset, size);
2196 if (data != pkt->data)
2199 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
2200 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
2201 mkv->last_track_timestamp[track_number - 1]);
2203 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
2205 if (discard_padding) {
2206 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
2209 if (side_data_size && additional_id == 1) {
2210 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2211 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2212 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
2213 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
2214 put_ebml_num(pb, side_data_size, 0);
2215 avio_write(pb, side_data, side_data_size);
2216 end_ebml_master(pb, block_more);
2217 end_ebml_master(pb, block_additions);
2219 if ((side_data_size && additional_id == 1) || discard_padding) {
2220 end_ebml_master(pb, block_group);
2224 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
2226 MatroskaMuxContext *mkv = s->priv_data;
2227 ebml_master blockgroup;
2228 int id_size, settings_size, size;
2229 uint8_t *id, *settings;
2230 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2231 const int flags = 0;
2234 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2238 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2241 size = id_size + 1 + settings_size + 1 + pkt->size;
2243 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2244 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
2245 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
2247 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
2249 put_ebml_id(pb, MATROSKA_ID_BLOCK);
2250 put_ebml_num(pb, size + 4, 0);
2251 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
2252 avio_wb16(pb, ts - mkv->cluster_pts);
2254 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2256 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2257 end_ebml_master(pb, blockgroup);
2259 return pkt->duration;
2262 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
2264 MatroskaMuxContext *mkv = s->priv_data;
2266 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2267 mkv->cluster_pos = -1;
2268 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
2269 av_log(s, AV_LOG_DEBUG,
2270 "Starting new cluster at offset %" PRIu64 " bytes, "
2271 "pts %" PRIu64 "dts %" PRIu64 "\n",
2272 avio_tell(s->pb), pkt->pts, pkt->dts);
2274 av_log(s, AV_LOG_DEBUG, "Starting new cluster, "
2275 "pts %" PRIu64 "dts %" PRIu64 "\n",
2276 pkt->pts, pkt->dts);
2280 static int mkv_check_new_extra_data(AVFormatContext *s, AVPacket *pkt)
2282 MatroskaMuxContext *mkv = s->priv_data;
2283 mkv_track *track = &mkv->tracks[pkt->stream_index];
2284 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2286 int side_data_size = 0, ret;
2288 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
2291 switch (par->codec_id) {
2292 case AV_CODEC_ID_AAC:
2293 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2294 int filler, output_sample_rate = 0;
2296 ret = get_aac_sample_rates(s, side_data, side_data_size, &track->sample_rate,
2297 &output_sample_rate);
2300 if (!output_sample_rate)
2301 output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
2302 av_freep(&par->extradata);
2303 ret = ff_alloc_extradata(par, side_data_size);
2306 memcpy(par->extradata, side_data, side_data_size);
2307 curpos = avio_tell(mkv->tracks_bc);
2308 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2309 mkv_write_codecprivate(s, mkv->tracks_bc, par, 1, 0);
2310 filler = MAX_PCE_SIZE + 2 + 4 - (avio_tell(mkv->tracks_bc) - track->codecpriv_offset);
2312 put_ebml_void(mkv->tracks_bc, filler);
2313 avio_seek(mkv->tracks_bc, track->sample_rate_offset, SEEK_SET);
2314 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
2315 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
2316 avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2317 } else if (!par->extradata_size && !track->sample_rate) {
2318 // No extradata (codecpar or packet side data).
2319 av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
2320 return AVERROR(EINVAL);
2323 case AV_CODEC_ID_FLAC:
2324 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2325 AVCodecParameters *codecpriv_par;
2327 if (side_data_size != par->extradata_size) {
2328 av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
2330 return AVERROR(EINVAL);
2332 codecpriv_par = avcodec_parameters_alloc();
2334 return AVERROR(ENOMEM);
2335 ret = avcodec_parameters_copy(codecpriv_par, par);
2337 avcodec_parameters_free(&codecpriv_par);
2340 memcpy(codecpriv_par->extradata, side_data, side_data_size);
2341 curpos = avio_tell(mkv->tracks_bc);
2342 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2343 mkv_write_codecprivate(s, mkv->tracks_bc, codecpriv_par, 1, 0);
2344 avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2345 avcodec_parameters_free(&codecpriv_par);
2348 // FIXME: Remove the following once libaom starts propagating extradata during init()
2349 // See https://bugs.chromium.org/p/aomedia/issues/detail?id=2012
2350 case AV_CODEC_ID_AV1:
2351 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live &&
2352 !par->extradata_size) {
2353 AVIOContext *dyn_cp;
2357 ret = avio_open_dyn_buf(&dyn_cp);
2360 ff_isom_write_av1c(dyn_cp, side_data, side_data_size);
2361 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
2362 if (!codecpriv_size) {
2364 return AVERROR_INVALIDDATA;
2366 curpos = avio_tell(mkv->tracks_bc);
2367 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2368 // Do not write the OBUs as we don't have space saved for them
2369 put_ebml_binary(mkv->tracks_bc, MATROSKA_ID_CODECPRIVATE, codecpriv, 4);
2371 avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2372 ret = ff_alloc_extradata(par, side_data_size);
2375 memcpy(par->extradata, side_data, side_data_size);
2376 } else if (!par->extradata_size)
2377 return AVERROR_INVALIDDATA;
2381 av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
2388 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2390 MatroskaMuxContext *mkv = s->priv_data;
2391 AVIOContext *pb = s->pb;
2392 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2393 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2394 int duration = pkt->duration;
2396 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2397 int64_t relative_packet_pos;
2398 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
2400 if (ts == AV_NOPTS_VALUE) {
2401 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2402 return AVERROR(EINVAL);
2404 ts += mkv->tracks[pkt->stream_index].ts_offset;
2406 if (mkv->cluster_pos != -1) {
2407 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
2408 if ((int16_t)cluster_time != cluster_time) {
2409 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2410 mkv_start_new_cluster(s, pkt);
2414 if (mkv->cluster_pos == -1) {
2415 mkv->cluster_pos = avio_tell(s->pb);
2416 ret = start_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, &mkv->cluster, MATROSKA_ID_CLUSTER, 0);
2419 put_ebml_uint(mkv->dyn_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2420 mkv->cluster_pts = FFMAX(0, ts);
2424 relative_packet_pos = avio_tell(pb);
2426 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2427 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2428 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2429 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
2430 if (ret < 0) return ret;
2433 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2434 duration = mkv_write_vtt_blocks(s, pb, pkt);
2436 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2437 mkv_blockgroup_size(pkt->size));
2439 #if FF_API_CONVERGENCE_DURATION
2440 FF_DISABLE_DEPRECATION_WARNINGS
2441 /* For backward compatibility, prefer convergence_duration. */
2442 if (pkt->convergence_duration > 0) {
2443 duration = pkt->convergence_duration;
2445 FF_ENABLE_DEPRECATION_WARNINGS
2447 /* All subtitle blocks are considered to be keyframes. */
2448 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2449 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2450 end_ebml_master(pb, blockgroup);
2453 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
2454 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
2455 mkv->cluster_pos, relative_packet_pos, duration);
2461 mkv->duration = FFMAX(mkv->duration, ts + duration);
2463 if (mkv->stream_durations)
2464 mkv->stream_durations[pkt->stream_index] =
2465 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
2470 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2472 MatroskaMuxContext *mkv = s->priv_data;
2473 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2474 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2476 int64_t cluster_time;
2478 int start_new_cluster;
2480 ret = mkv_check_new_extra_data(s, pkt);
2484 if (mkv->tracks[pkt->stream_index].write_dts)
2485 cluster_time = pkt->dts - mkv->cluster_pts;
2487 cluster_time = pkt->pts - mkv->cluster_pts;
2488 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2490 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2491 // after 4k and on a keyframe
2492 cluster_size = avio_tell(mkv->dyn_bc);
2494 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2495 // WebM DASH specification states that the first block of every cluster
2496 // has to be a key frame. So for DASH video, we only create a cluster
2497 // on seeing key frames.
2498 start_new_cluster = keyframe;
2499 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2500 (mkv->cluster_pos == -1 ||
2501 cluster_time > mkv->cluster_time_limit)) {
2502 // For DASH audio, we create a Cluster based on cluster_time_limit
2503 start_new_cluster = 1;
2504 } else if (!mkv->is_dash &&
2505 (cluster_size > mkv->cluster_size_limit ||
2506 cluster_time > mkv->cluster_time_limit ||
2507 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2508 cluster_size > 4 * 1024))) {
2509 start_new_cluster = 1;
2511 start_new_cluster = 0;
2514 if (mkv->cluster_pos != -1 && start_new_cluster) {
2515 mkv_start_new_cluster(s, pkt);
2518 if (!mkv->cluster_pos)
2519 avio_write_marker(s->pb,
2520 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2521 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2523 // check if we have an audio packet cached
2524 if (mkv->cur_audio_pkt.size > 0) {
2525 // for DASH audio, a CuePoint has to be added when there is a new cluster.
2526 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2527 mkv->is_dash ? start_new_cluster : 0);
2528 av_packet_unref(&mkv->cur_audio_pkt);
2530 av_log(s, AV_LOG_ERROR,
2531 "Could not write cached audio packet ret:%d\n", ret);
2536 // buffer an audio packet to ensure the packet containing the video
2537 // keyframe's timecode is contained in the same cluster for WebM
2538 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2540 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2542 ret = mkv_write_packet_internal(s, pkt, 0);
2546 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2548 MatroskaMuxContext *mkv = s->priv_data;
2551 if (mkv->cluster_pos != -1) {
2552 end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2553 mkv->cluster_pos = -1;
2554 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
2555 av_log(s, AV_LOG_DEBUG,
2556 "Flushing cluster at offset %" PRIu64 " bytes\n",
2559 av_log(s, AV_LOG_DEBUG, "Flushing cluster\n");
2564 return mkv_write_packet(s, pkt);
2567 static int mkv_write_trailer(AVFormatContext *s)
2569 MatroskaMuxContext *mkv = s->priv_data;
2570 AVIOContext *pb = s->pb;
2571 int64_t currentpos, cuespos;
2574 // check if we have an audio packet cached
2575 if (mkv->cur_audio_pkt.size > 0) {
2576 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2577 av_packet_unref(&mkv->cur_audio_pkt);
2579 av_log(s, AV_LOG_ERROR,
2580 "Could not write cached audio packet ret:%d\n", ret);
2586 end_ebml_master_crc32(pb, &mkv->dyn_bc, mkv, mkv->cluster);
2589 ret = mkv_write_chapters(s);
2594 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2595 if (mkv->cues->num_entries) {
2596 if (mkv->reserve_cues_space) {
2599 currentpos = avio_tell(pb);
2600 avio_seek(pb, mkv->cues_pos, SEEK_SET);
2602 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2603 cues_end = avio_tell(pb);
2604 if (cues_end > cuespos + mkv->reserve_cues_space) {
2605 av_log(s, AV_LOG_ERROR,
2606 "Insufficient space reserved for cues: %d "
2607 "(needed: %" PRId64 ").\n",
2608 mkv->reserve_cues_space, cues_end - cuespos);
2609 return AVERROR(EINVAL);
2612 if (cues_end < cuespos + mkv->reserve_cues_space)
2613 put_ebml_void(pb, mkv->reserve_cues_space -
2614 (cues_end - cuespos));
2616 avio_seek(pb, currentpos, SEEK_SET);
2618 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2621 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2627 mkv_write_seekhead(pb, mkv);
2629 // update the duration
2630 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2631 currentpos = avio_tell(pb);
2632 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2633 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2634 avio_seek(pb, mkv->info.pos, SEEK_SET);
2635 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
2637 // write tracks master
2638 avio_seek(pb, mkv->tracks_master.pos, SEEK_SET);
2639 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
2641 // update stream durations
2642 if (!mkv->is_live && mkv->stream_durations) {
2644 int64_t curr = avio_tell(mkv->tags_bc);
2645 for (i = 0; i < s->nb_streams; ++i) {
2646 AVStream *st = s->streams[i];
2648 if (mkv->stream_duration_offsets[i] > 0) {
2649 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2650 char duration_string[20] = "";
2652 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2653 mkv->stream_durations[i]);
2655 avio_seek(mkv->tags_bc, mkv->stream_duration_offsets[i], SEEK_SET);
2657 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2658 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2659 fmod(duration_sec, 60));
2661 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2664 avio_seek(mkv->tags_bc, curr, SEEK_SET);
2666 if (mkv->tags.pos && !mkv->is_live) {
2667 avio_seek(pb, mkv->tags.pos, SEEK_SET);
2668 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
2671 avio_seek(pb, currentpos, SEEK_SET);
2674 if (!mkv->is_live) {
2675 end_ebml_master(pb, mkv->segment);
2682 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2685 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2686 if (ff_mkv_codec_tags[i].id == codec_id)
2689 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2690 enum AVMediaType type = avcodec_get_type(codec_id);
2691 // mkv theoretically supports any video/audio through VFW/ACM
2692 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2699 static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
2702 for (i = 0; ff_webm_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2703 if (ff_webm_codec_tags[i].id == codec_id)
2709 static int mkv_init(struct AVFormatContext *s)
2713 if (s->nb_streams > MAX_TRACKS) {
2714 av_log(s, AV_LOG_ERROR,
2715 "At most %d streams are supported for muxing in Matroska\n",
2717 return AVERROR(EINVAL);
2720 for (i = 0; i < s->nb_streams; i++) {
2721 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
2722 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
2723 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
2724 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
2725 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
2726 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
2727 av_log(s, AV_LOG_ERROR,
2728 "The Matroska muxer does not yet support muxing %s\n",
2729 avcodec_get_name(s->streams[i]->codecpar->codec_id));
2730 return AVERROR_PATCHWELCOME;
2734 if (s->avoid_negative_ts < 0) {
2735 s->avoid_negative_ts = 1;
2736 s->internal->avoid_negative_ts_use_pts = 1;
2739 for (i = 0; i < s->nb_streams; i++) {
2740 // ms precision is the de-facto standard timescale for mkv files
2741 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2747 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2750 AVStream *st = s->streams[pkt->stream_index];
2752 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2753 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2754 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2755 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2756 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2762 static const AVCodecTag additional_audio_tags[] = {
2763 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2764 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2765 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2766 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2767 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2768 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2769 { AV_CODEC_ID_QDMC, 0xFFFFFFFF },
2770 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2771 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2772 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2773 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2774 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2775 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2778 static const AVCodecTag additional_video_tags[] = {
2779 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2780 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2781 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2782 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2785 static const AVCodecTag additional_subtitle_tags[] = {
2786 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2787 { AV_CODEC_ID_DVD_SUBTITLE, 0xFFFFFFFF },
2788 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2789 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2792 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2793 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2794 static const AVOption options[] = {
2795 { "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 },
2796 { "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 },
2797 { "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 },
2798 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2799 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2800 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2801 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2802 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2806 #if CONFIG_MATROSKA_MUXER
2807 static const AVClass matroska_class = {
2808 .class_name = "matroska muxer",
2809 .item_name = av_default_item_name,
2811 .version = LIBAVUTIL_VERSION_INT,
2814 AVOutputFormat ff_matroska_muxer = {
2816 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2817 .mime_type = "video/x-matroska",
2818 .extensions = "mkv",
2819 .priv_data_size = sizeof(MatroskaMuxContext),
2820 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2821 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2822 .video_codec = CONFIG_LIBX264_ENCODER ?
2823 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2825 .write_header = mkv_write_header,
2826 .write_packet = mkv_write_flush_packet,
2827 .write_trailer = mkv_write_trailer,
2828 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2829 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2830 .codec_tag = (const AVCodecTag* const []){
2831 ff_codec_bmp_tags, ff_codec_wav_tags,
2832 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2834 .subtitle_codec = AV_CODEC_ID_ASS,
2835 .query_codec = mkv_query_codec,
2836 .check_bitstream = mkv_check_bitstream,
2837 .priv_class = &matroska_class,
2841 #if CONFIG_WEBM_MUXER
2842 static const AVClass webm_class = {
2843 .class_name = "webm muxer",
2844 .item_name = av_default_item_name,
2846 .version = LIBAVUTIL_VERSION_INT,
2849 AVOutputFormat ff_webm_muxer = {
2851 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2852 .mime_type = "video/webm",
2853 .extensions = "webm",
2854 .priv_data_size = sizeof(MatroskaMuxContext),
2855 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2856 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2857 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2859 .write_header = mkv_write_header,
2860 .write_packet = mkv_write_flush_packet,
2861 .write_trailer = mkv_write_trailer,
2862 .query_codec = webm_query_codec,
2863 .check_bitstream = mkv_check_bitstream,
2864 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2865 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2866 .priv_class = &webm_class,
2870 #if CONFIG_MATROSKA_AUDIO_MUXER
2871 static const AVClass mka_class = {
2872 .class_name = "matroska audio muxer",
2873 .item_name = av_default_item_name,
2875 .version = LIBAVUTIL_VERSION_INT,
2877 AVOutputFormat ff_matroska_audio_muxer = {
2879 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2880 .mime_type = "audio/x-matroska",
2881 .extensions = "mka",
2882 .priv_data_size = sizeof(MatroskaMuxContext),
2883 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2884 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2885 .video_codec = AV_CODEC_ID_NONE,
2887 .write_header = mkv_write_header,
2888 .write_packet = mkv_write_flush_packet,
2889 .write_trailer = mkv_write_trailer,
2890 .check_bitstream = mkv_check_bitstream,
2891 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2893 .codec_tag = (const AVCodecTag* const []){
2894 ff_codec_wav_tags, additional_audio_tags, 0
2896 .priv_class = &mka_class,