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 containing AVIOContext where the size field starts
62 ///< for level 1 elements or else where the master's elements start
63 int sizebytes; ///< how many bytes were reserved/shall be used for the size
66 typedef struct mkv_seekhead_entry {
71 typedef struct mkv_seekhead {
73 int64_t segment_offset; ///< the file offset to the beginning of the segment
74 int reserved_size; ///< -1 if appending to file
76 mkv_seekhead_entry *entries;
80 typedef struct mkv_cuepoint {
84 int64_t cluster_pos; ///< file offset of the cluster containing the block
85 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
86 int64_t duration; ///< duration of the block according to time base
89 typedef struct mkv_cues {
90 int64_t segment_offset;
91 mkv_cuepoint *entries;
95 typedef struct mkv_track {
99 int64_t sample_rate_offset;
100 int64_t codecpriv_offset;
104 typedef struct mkv_attachment {
109 typedef struct mkv_attachments {
110 mkv_attachment *entries;
114 #define MODE_MATROSKAv2 0x01
115 #define MODE_WEBM 0x02
117 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
118 * range 1 to 126 (inclusive) */
119 #define MAX_TRACKS 126
121 typedef struct MatroskaMuxContext {
122 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;
132 AVIOContext *cluster_bc;
134 int64_t cluster_pos; ///< file offset of the current cluster
136 int64_t duration_offset;
138 mkv_seekhead *seekhead;
141 mkv_attachments *attachments;
143 AVPacket cur_audio_pkt;
145 int have_attachments;
148 int reserve_cues_space;
149 int cluster_size_limit;
151 int64_t cluster_time_limit;
153 int dash_track_number;
157 uint32_t chapter_id_offset;
160 int64_t last_track_timestamp[MAX_TRACKS];
162 int64_t *stream_durations;
163 int64_t *stream_duration_offsets;
166 } MatroskaMuxContext;
168 /** 2 bytes * 7 for EBML IDs, 7 1-byte EBML lengths, 6 1-byte uint,
169 * 8 byte for "matroska" doctype string */
170 #define MAX_EBML_HEADER_SIZE 35
172 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
173 * offset, 4 bytes for target EBML ID */
174 #define MAX_SEEKENTRY_SIZE 21
176 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 3 8-byte uint max
177 * and one 1-byte uint for the track number (this assumes MAX_TRACKS to be <= 255) */
178 #define MAX_CUETRACKPOS_SIZE 35
180 /** per-cuepoint - 1 1-byte EBML ID, 1 1-byte EBML size, 8-byte uint max */
181 #define MAX_CUEPOINT_CONTENT_SIZE(num_tracks) 10 + MAX_CUETRACKPOS_SIZE * num_tracks
183 /** Seek preroll value for opus */
184 #define OPUS_SEEK_PREROLL 80000000
186 static int ebml_id_size(uint32_t id)
188 return (av_log2(id + 1) - 1) / 7 + 1;
191 static void put_ebml_id(AVIOContext *pb, uint32_t id)
193 int i = ebml_id_size(id);
195 avio_w8(pb, (uint8_t)(id >> (i * 8)));
199 * Write an EBML size meaning "unknown size".
201 * @param bytes The number of bytes the size should occupy (maximum: 8).
203 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
205 av_assert0(bytes <= 8);
206 avio_w8(pb, 0x1ff >> bytes);
207 ffio_fill(pb, 0xff, bytes - 1);
211 * Calculate how many bytes are needed to represent a given number in EBML.
213 static int ebml_num_size(uint64_t num)
216 while ((num + 1) >> bytes * 7)
222 * Write a number in EBML variable length format.
224 * @param bytes The number of bytes that need to be used to write the number.
225 * If zero, any number of bytes can be used.
227 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
229 int i, needed_bytes = ebml_num_size(num);
231 // sizes larger than this are currently undefined in EBML
232 av_assert0(num < (1ULL << 56) - 1);
235 // don't care how many bytes are used, so use the min
236 bytes = needed_bytes;
237 // the bytes needed to write the given size would exceed the bytes
238 // that we need to use, so write unknown size. This shouldn't happen.
239 av_assert0(bytes >= needed_bytes);
241 num |= 1ULL << bytes * 7;
242 for (i = bytes - 1; i >= 0; i--)
243 avio_w8(pb, (uint8_t)(num >> i * 8));
246 static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
253 put_ebml_id(pb, elementid);
254 put_ebml_num(pb, bytes, 0);
255 for (i = bytes - 1; i >= 0; i--)
256 avio_w8(pb, (uint8_t)(val >> i * 8));
259 static void put_ebml_sint(AVIOContext *pb, uint32_t elementid, int64_t val)
262 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
264 while (tmp>>=8) bytes++;
266 put_ebml_id(pb, elementid);
267 put_ebml_num(pb, bytes, 0);
268 for (i = bytes - 1; i >= 0; i--)
269 avio_w8(pb, (uint8_t)(val >> i * 8));
272 static void put_ebml_float(AVIOContext *pb, uint32_t elementid, double val)
274 put_ebml_id(pb, elementid);
275 put_ebml_num(pb, 8, 0);
276 avio_wb64(pb, av_double2int(val));
279 static void put_ebml_binary(AVIOContext *pb, uint32_t elementid,
280 const void *buf, int size)
282 put_ebml_id(pb, elementid);
283 put_ebml_num(pb, size, 0);
284 avio_write(pb, buf, size);
287 static void put_ebml_string(AVIOContext *pb, uint32_t elementid,
290 put_ebml_binary(pb, elementid, str, strlen(str));
294 * Write a void element of a given size. Useful for reserving space in
295 * the file to be written to later.
297 * @param size The number of bytes to reserve, which must be at least 2.
299 static void put_ebml_void(AVIOContext *pb, uint64_t size)
301 int64_t currentpos = avio_tell(pb);
303 av_assert0(size >= 2);
305 put_ebml_id(pb, EBML_ID_VOID);
306 // we need to subtract the length needed to store the size from the
307 // size we need to reserve so 2 cases, we use 8 bytes to store the
308 // size if possible, 1 byte otherwise
310 put_ebml_num(pb, size - 2, 0);
312 put_ebml_num(pb, size - 9, 8);
313 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
316 static ebml_master start_ebml_master(AVIOContext *pb, uint32_t elementid,
317 uint64_t expectedsize)
319 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
321 put_ebml_id(pb, elementid);
322 put_ebml_size_unknown(pb, bytes);
323 return (ebml_master) { avio_tell(pb), bytes };
326 static void end_ebml_master(AVIOContext *pb, ebml_master master)
328 int64_t pos = avio_tell(pb);
330 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
332 put_ebml_num(pb, pos - master.pos, master.sizebytes);
333 avio_seek(pb, pos, SEEK_SET);
336 static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
337 ebml_master *master, uint32_t elementid, uint64_t expectedsize)
339 int ret, bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
341 if ((ret = avio_open_dyn_buf(dyn_cp)) < 0)
344 put_ebml_id(pb, elementid);
345 *master = (ebml_master) { avio_tell(pb), bytes };
347 put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
352 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
355 uint8_t *buf, crc[4];
358 size = avio_close_dyn_buf(*dyn_cp, &buf);
359 put_ebml_num(pb, size, master.sizebytes);
360 if (mkv->write_crc) {
361 skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
362 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
363 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
365 avio_write(pb, buf + skip, size - skip);
372 * Complete ebml master without destroying the buffer, allowing for later updates
374 static void end_ebml_master_crc32_preliminary(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
378 int size = avio_get_dyn_buf(*dyn_cp, &buf);
380 put_ebml_num(pb, size, master.sizebytes);
381 avio_write(pb, buf, size);
384 static void put_xiph_size(AVIOContext *pb, int size)
386 ffio_fill(pb, 255, size / 255);
387 avio_w8(pb, size % 255);
391 * Free the members allocated in the mux context.
393 static void mkv_free(MatroskaMuxContext *mkv) {
395 if (mkv->cluster_bc) {
396 avio_close_dyn_buf(mkv->cluster_bc, &buf);
400 avio_close_dyn_buf(mkv->info_bc, &buf);
403 if (mkv->tracks_bc) {
404 avio_close_dyn_buf(mkv->tracks_bc, &buf);
408 avio_close_dyn_buf(mkv->tags_bc, &buf);
412 av_freep(&mkv->seekhead->entries);
413 av_freep(&mkv->seekhead);
416 av_freep(&mkv->cues->entries);
417 av_freep(&mkv->cues);
419 if (mkv->attachments) {
420 av_freep(&mkv->attachments->entries);
421 av_freep(&mkv->attachments);
423 av_freep(&mkv->tracks);
424 av_freep(&mkv->stream_durations);
425 av_freep(&mkv->stream_duration_offsets);
429 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
430 * elements. If a maximum number of elements is specified, enough space
431 * will be reserved at the current file location to write a seek head of
434 * @param segment_offset The absolute offset to the position in the file
435 * where the segment begins.
436 * @param numelements The maximum number of elements that will be indexed
437 * by this seek head, 0 if unlimited.
439 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
442 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
446 new_seekhead->segment_offset = segment_offset;
448 if (numelements > 0) {
449 new_seekhead->filepos = avio_tell(pb);
450 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
451 // and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
452 // that an EBML void element will fit afterwards
453 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
454 new_seekhead->max_entries = numelements;
455 put_ebml_void(pb, new_seekhead->reserved_size);
460 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, uint32_t elementid, uint64_t filepos)
462 mkv_seekhead_entry *entries = seekhead->entries;
464 // don't store more elements than we reserved space for
465 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
468 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
470 return AVERROR(ENOMEM);
471 seekhead->entries = entries;
473 seekhead->entries[seekhead->num_entries].elementid = elementid;
474 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
480 * Write the seek head to the file and free it. If a maximum number of
481 * elements was specified to mkv_start_seekhead(), the seek head will
482 * be written at the location reserved for it. Otherwise, it is written
483 * at the current location in the file.
485 * @return The file offset where the seekhead was written,
486 * -1 if an error occurred.
488 static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
491 mkv_seekhead *seekhead = mkv->seekhead;
492 ebml_master metaseek, seekentry;
496 currentpos = avio_tell(pb);
498 if (seekhead->reserved_size > 0) {
499 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
505 if (start_ebml_master_crc32(pb, &dyn_cp, mkv, &metaseek, MATROSKA_ID_SEEKHEAD,
506 seekhead->reserved_size) < 0) {
511 for (i = 0; i < seekhead->num_entries; i++) {
512 mkv_seekhead_entry *entry = &seekhead->entries[i];
514 seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
516 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
517 put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
518 put_ebml_id(dyn_cp, entry->elementid);
520 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
521 end_ebml_master(dyn_cp, seekentry);
523 end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
525 if (seekhead->reserved_size > 0) {
526 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
527 put_ebml_void(pb, remaining);
528 avio_seek(pb, currentpos, SEEK_SET);
530 currentpos = seekhead->filepos;
533 av_freep(&mkv->seekhead->entries);
534 av_freep(&mkv->seekhead);
539 static mkv_cues *mkv_start_cues(int64_t segment_offset)
541 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
545 cues->segment_offset = segment_offset;
549 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
550 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
552 mkv_cuepoint *entries = cues->entries;
557 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
559 return AVERROR(ENOMEM);
560 cues->entries = entries;
562 cues->entries[cues->num_entries].pts = ts;
563 cues->entries[cues->num_entries].stream_idx = stream;
564 cues->entries[cues->num_entries].tracknum = tracknum;
565 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
566 cues->entries[cues->num_entries].relative_pos = relative_pos;
567 cues->entries[cues->num_entries++].duration = duration;
572 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
574 MatroskaMuxContext *mkv = s->priv_data;
575 AVIOContext *dyn_cp, *pb = s->pb;
576 ebml_master cues_element;
580 currentpos = avio_tell(pb);
581 ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &cues_element, MATROSKA_ID_CUES, 0);
585 for (i = 0; i < cues->num_entries; i++) {
586 ebml_master cuepoint, track_positions;
587 mkv_cuepoint *entry = &cues->entries[i];
588 uint64_t pts = entry->pts;
591 // Calculate the number of entries, so we know the element size
592 for (j = 0; j < num_tracks; j++)
593 tracks[j].has_cue = 0;
594 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
595 int tracknum = entry[j].stream_idx;
596 av_assert0(tracknum>=0 && tracknum<num_tracks);
597 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
599 tracks[tracknum].has_cue = 1;
603 cuepoint = start_ebml_master(dyn_cp, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_CONTENT_SIZE(ctp_nb));
604 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETIME, pts);
606 // put all the entries from different tracks that have the exact same
607 // timestamp into the same CuePoint
608 for (j = 0; j < num_tracks; j++)
609 tracks[j].has_cue = 0;
610 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
611 int tracknum = entry[j].stream_idx;
612 av_assert0(tracknum>=0 && tracknum<num_tracks);
613 if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
615 tracks[tracknum].has_cue = 1;
616 track_positions = start_ebml_master(dyn_cp, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
617 put_ebml_uint(dyn_cp, MATROSKA_ID_CUETRACK , entry[j].tracknum );
618 put_ebml_uint(dyn_cp, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
619 put_ebml_uint(dyn_cp, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
620 if (entry[j].duration != -1)
621 put_ebml_uint(dyn_cp, MATROSKA_ID_CUEDURATION , entry[j].duration);
622 end_ebml_master(dyn_cp, track_positions);
625 end_ebml_master(dyn_cp, cuepoint);
627 end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
632 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
634 const uint8_t *header_start[3];
636 int first_header_size;
639 if (par->codec_id == AV_CODEC_ID_VORBIS)
640 first_header_size = 30;
642 first_header_size = 42;
644 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
645 first_header_size, header_start, header_len) < 0) {
646 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
650 avio_w8(pb, 2); // number packets - 1
651 for (j = 0; j < 2; j++) {
652 put_xiph_size(pb, header_len[j]);
654 for (j = 0; j < 3; j++)
655 avio_write(pb, header_start[j], header_len[j]);
660 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
662 if (par->extradata && par->extradata_size == 2)
663 avio_write(pb, par->extradata, 2);
665 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
669 static int put_flac_codecpriv(AVFormatContext *s,
670 AVIOContext *pb, AVCodecParameters *par)
672 int write_comment = (par->channel_layout &&
673 !(par->channel_layout & ~0x3ffffULL) &&
674 !ff_flac_is_native_layout(par->channel_layout));
675 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
682 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
683 "Lavf" : LIBAVFORMAT_IDENT;
684 AVDictionary *dict = NULL;
685 uint8_t buf[32], *data, *p;
688 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
689 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
691 len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
692 if (len >= ((1<<24) - 4)) {
694 return AVERROR(EINVAL);
697 data = av_malloc(len + 4);
700 return AVERROR(ENOMEM);
704 AV_WB24(data + 1, len);
707 ff_vorbiscomment_write(&p, &dict, vendor, NULL, 0);
709 avio_write(pb, data, len + 4);
718 static int get_aac_sample_rates(AVFormatContext *s, uint8_t *extradata, int extradata_size,
719 int *sample_rate, int *output_sample_rate)
721 MPEG4AudioConfig mp4ac;
724 ret = avpriv_mpeg4audio_get_config(&mp4ac, extradata,
725 extradata_size * 8, 1);
726 /* Don't abort if the failure is because of missing extradata. Assume in that
727 * case a bitstream filter will provide the muxer with the extradata in the
729 * Abort however if s->pb is not seekable, as we would not be able to seek back
730 * to write the sample rate elements once the extradata shows up, anyway. */
731 if (ret < 0 && (extradata_size || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL))) {
732 av_log(s, AV_LOG_ERROR,
733 "Error parsing AAC extradata, unable to determine samplerate.\n");
734 return AVERROR(EINVAL);
738 /* This will only happen when this function is called while writing the
739 * header and no extradata is available. The space for this element has
740 * to be reserved for when this function is called again after the
741 * extradata shows up in the first packet, as there's no way to know if
742 * output_sample_rate will be different than sample_rate or not. */
743 *output_sample_rate = *sample_rate;
745 *sample_rate = mp4ac.sample_rate;
746 *output_sample_rate = mp4ac.ext_sample_rate;
751 static int mkv_write_native_codecprivate(AVFormatContext *s, AVIOContext *pb,
752 AVCodecParameters *par,
755 switch (par->codec_id) {
756 case AV_CODEC_ID_VORBIS:
757 case AV_CODEC_ID_THEORA:
758 return put_xiph_codecpriv(s, dyn_cp, par);
759 case AV_CODEC_ID_FLAC:
760 return put_flac_codecpriv(s, dyn_cp, par);
761 case AV_CODEC_ID_WAVPACK:
762 return put_wv_codecpriv(dyn_cp, par);
763 case AV_CODEC_ID_H264:
764 return ff_isom_write_avcc(dyn_cp, par->extradata,
765 par->extradata_size);
766 case AV_CODEC_ID_HEVC:
767 ff_isom_write_hvcc(dyn_cp, par->extradata,
768 par->extradata_size, 0);
770 case AV_CODEC_ID_AV1:
771 if (par->extradata_size)
772 return ff_isom_write_av1c(dyn_cp, par->extradata,
773 par->extradata_size);
775 put_ebml_void(pb, 4 + 3);
777 case AV_CODEC_ID_ALAC:
778 if (par->extradata_size < 36) {
779 av_log(s, AV_LOG_ERROR,
780 "Invalid extradata found, ALAC expects a 36-byte "
782 return AVERROR_INVALIDDATA;
784 avio_write(dyn_cp, par->extradata + 12,
785 par->extradata_size - 12);
787 case AV_CODEC_ID_AAC:
788 if (par->extradata_size)
789 avio_write(dyn_cp, par->extradata, par->extradata_size);
791 put_ebml_void(pb, MAX_PCE_SIZE + 2 + 4);
794 if (par->codec_id == AV_CODEC_ID_PRORES &&
795 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
796 avio_wl32(dyn_cp, par->codec_tag);
797 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
798 avio_write(dyn_cp, par->extradata, par->extradata_size);
804 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
805 AVCodecParameters *par,
806 int native_id, int qt_id)
810 int ret, codecpriv_size;
812 ret = avio_open_dyn_buf(&dyn_cp);
817 ret = mkv_write_native_codecprivate(s, pb, par, dyn_cp);
818 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
821 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
823 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
824 && (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
827 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
828 avio_wl32(dyn_cp, par->codec_tag);
829 for(i = 0; i < 0x5a - 8; i++)
832 avio_write(dyn_cp, par->extradata, par->extradata_size);
834 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
835 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
836 avcodec_get_name(par->codec_id));
839 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
841 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
842 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
843 avcodec_get_name(par->codec_id));
844 ret = AVERROR(EINVAL);
847 ff_put_bmp_header(dyn_cp, par, 0, 0);
849 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
851 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
853 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
854 avcodec_get_name(par->codec_id));
855 ret = AVERROR(EINVAL);
858 par->codec_tag = tag;
860 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
863 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
865 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
871 static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
873 uint8_t *colorinfo_ptr;
874 int side_data_size = 0;
875 int ret, colorinfo_size;
876 const uint8_t *side_data;
878 ret = avio_open_dyn_buf(&dyn_cp);
882 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
883 par->color_trc < AVCOL_TRC_NB) {
884 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
887 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
888 par->color_space < AVCOL_SPC_NB) {
889 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
891 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
892 par->color_primaries < AVCOL_PRI_NB) {
893 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
895 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
896 par->color_range < AVCOL_RANGE_NB) {
897 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
899 if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
900 par->chroma_location <= AVCHROMA_LOC_TOP) {
903 avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
904 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
905 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
908 side_data = av_stream_get_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
910 if (side_data_size) {
911 const AVContentLightMetadata *metadata =
912 (const AVContentLightMetadata*)side_data;
913 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXCLL, metadata->MaxCLL);
914 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXFALL, metadata->MaxFALL);
917 side_data = av_stream_get_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
919 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
920 ebml_master meta_element = start_ebml_master(
921 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
922 const AVMasteringDisplayMetadata *metadata =
923 (const AVMasteringDisplayMetadata*)side_data;
924 if (metadata->has_primaries) {
925 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
926 av_q2d(metadata->display_primaries[0][0]));
927 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
928 av_q2d(metadata->display_primaries[0][1]));
929 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
930 av_q2d(metadata->display_primaries[1][0]));
931 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
932 av_q2d(metadata->display_primaries[1][1]));
933 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
934 av_q2d(metadata->display_primaries[2][0]));
935 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
936 av_q2d(metadata->display_primaries[2][1]));
937 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
938 av_q2d(metadata->white_point[0]));
939 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
940 av_q2d(metadata->white_point[1]));
942 if (metadata->has_luminance) {
943 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
944 av_q2d(metadata->max_luminance));
945 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
946 av_q2d(metadata->min_luminance));
948 end_ebml_master(dyn_cp, meta_element);
951 colorinfo_size = avio_close_dyn_buf(dyn_cp, &colorinfo_ptr);
952 if (colorinfo_size) {
953 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, colorinfo_size);
954 avio_write(pb, colorinfo_ptr, colorinfo_size);
955 end_ebml_master(pb, colorinfo);
957 av_free(colorinfo_ptr);
961 static int mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
966 int side_data_size = 0;
967 int ret, projection_size;
968 uint8_t *projection_ptr;
971 const AVSphericalMapping *spherical =
972 (const AVSphericalMapping *)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
978 ret = avio_open_dyn_buf(&dyn_cp);
982 switch (spherical->projection) {
983 case AV_SPHERICAL_EQUIRECTANGULAR:
984 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
985 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
987 case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
988 ffio_init_context(&b, private, 20, 1, NULL, NULL, NULL, NULL);
989 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
990 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
991 avio_wb32(&b, 0); // version + flags
992 avio_wb32(&b, spherical->bound_top);
993 avio_wb32(&b, spherical->bound_bottom);
994 avio_wb32(&b, spherical->bound_left);
995 avio_wb32(&b, spherical->bound_right);
996 put_ebml_binary(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
997 private, avio_tell(&b));
999 case AV_SPHERICAL_CUBEMAP:
1000 ffio_init_context(&b, private, 12, 1, NULL, NULL, NULL, NULL);
1001 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
1002 MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
1003 avio_wb32(&b, 0); // version + flags
1004 avio_wb32(&b, 0); // layout
1005 avio_wb32(&b, spherical->padding);
1006 put_ebml_binary(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
1007 private, avio_tell(&b));
1010 av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
1015 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW,
1016 (double) spherical->yaw / (1 << 16));
1017 if (spherical->pitch)
1018 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH,
1019 (double) spherical->pitch / (1 << 16));
1020 if (spherical->roll)
1021 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL,
1022 (double) spherical->roll / (1 << 16));
1025 projection_size = avio_close_dyn_buf(dyn_cp, &projection_ptr);
1026 if (projection_size) {
1027 ebml_master projection = start_ebml_master(pb,
1028 MATROSKA_ID_VIDEOPROJECTION,
1030 avio_write(pb, projection_ptr, projection_size);
1031 end_ebml_master(pb, projection);
1033 av_freep(&projection_ptr);
1038 static void mkv_write_field_order(AVIOContext *pb, int mode,
1039 enum AVFieldOrder field_order)
1041 switch (field_order) {
1042 case AV_FIELD_UNKNOWN:
1044 case AV_FIELD_PROGRESSIVE:
1045 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1046 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
1052 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1053 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
1054 if (mode != MODE_WEBM) {
1055 switch (field_order) {
1057 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1058 MATROSKA_VIDEO_FIELDORDER_TT);
1061 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1062 MATROSKA_VIDEO_FIELDORDER_BB);
1065 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1066 MATROSKA_VIDEO_FIELDORDER_TB);
1069 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1070 MATROSKA_VIDEO_FIELDORDER_BT);
1077 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
1078 AVStream *st, int mode, int *h_width, int *h_height)
1082 AVDictionaryEntry *tag;
1083 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1087 // convert metadata into proper side data and add it to the stream
1088 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
1089 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
1090 int stereo_mode = atoi(tag->value);
1092 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
1093 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
1098 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1099 stereo_mode != 10 && stereo_mode != 12) {
1100 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
1106 // iterate to find the stereo3d side data
1107 for (i = 0; i < st->nb_side_data; i++) {
1108 AVPacketSideData sd = st->side_data[i];
1109 if (sd.type == AV_PKT_DATA_STEREO3D) {
1110 AVStereo3D *stereo = (AVStereo3D *)sd.data;
1112 switch (stereo->type) {
1113 case AV_STEREO3D_2D:
1114 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
1116 case AV_STEREO3D_SIDEBYSIDE:
1117 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1118 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
1119 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
1122 case AV_STEREO3D_TOPBOTTOM:
1123 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
1124 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1128 case AV_STEREO3D_CHECKERBOARD:
1129 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
1130 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1133 case AV_STEREO3D_LINES:
1134 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
1135 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1139 case AV_STEREO3D_COLUMNS:
1140 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
1141 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1145 case AV_STEREO3D_FRAMESEQUENCE:
1146 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
1147 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1155 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1158 // if webm, do not write unsupported modes
1159 if ((mode == MODE_WEBM &&
1160 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
1161 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
1162 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
1163 av_log(s, AV_LOG_ERROR,
1164 "The specified stereo mode is not valid.\n");
1165 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1166 return AVERROR(EINVAL);
1169 // write StereoMode if format is valid
1170 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1175 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1176 int i, AVIOContext *pb, int default_stream_exists)
1178 AVStream *st = s->streams[i];
1179 AVCodecParameters *par = st->codecpar;
1180 ebml_master subinfo, track;
1183 int bit_depth = av_get_bits_per_sample(par->codec_id);
1184 int sample_rate = par->sample_rate;
1185 int output_sample_rate = 0;
1186 int display_width_div = 1;
1187 int display_height_div = 1;
1189 AVDictionaryEntry *tag;
1191 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1192 mkv->have_attachments = 1;
1196 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
1197 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1198 if (par->bits_per_raw_sample)
1199 bit_depth = par->bits_per_raw_sample;
1201 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1204 bit_depth = par->bits_per_coded_sample;
1207 if (par->codec_id == AV_CODEC_ID_AAC) {
1208 ret = get_aac_sample_rates(s, par->extradata, par->extradata_size, &sample_rate,
1209 &output_sample_rate);
1214 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1215 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1216 mkv->is_dash ? mkv->dash_track_number : i + 1);
1217 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1218 mkv->is_dash ? mkv->dash_track_number : i + 1);
1219 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1221 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1222 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1223 tag = av_dict_get(st->metadata, "language", NULL, 0);
1224 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1225 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
1226 } else if (tag && tag->value) {
1227 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
1230 // The default value for TRACKFLAGDEFAULT is 1, so add element
1231 // if we need to clear it.
1232 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1233 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1235 if (st->disposition & AV_DISPOSITION_FORCED)
1236 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1238 if (mkv->mode == MODE_WEBM) {
1239 const char *codec_id;
1240 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1241 for (j = 0; ff_webm_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1242 if (ff_webm_codec_tags[j].id == par->codec_id) {
1243 codec_id = ff_webm_codec_tags[j].str;
1248 } else if (par->codec_id == AV_CODEC_ID_WEBVTT) {
1249 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1250 codec_id = "D_WEBVTT/CAPTIONS";
1251 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1252 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1253 codec_id = "D_WEBVTT/DESCRIPTIONS";
1254 native_id = MATROSKA_TRACK_TYPE_METADATA;
1255 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1256 codec_id = "D_WEBVTT/METADATA";
1257 native_id = MATROSKA_TRACK_TYPE_METADATA;
1259 codec_id = "D_WEBVTT/SUBTITLES";
1260 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1265 av_log(s, AV_LOG_ERROR,
1266 "Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1267 return AVERROR(EINVAL);
1270 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1272 // look for a codec ID string specific to mkv to use,
1273 // if none are found, use AVI codes
1274 if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
1275 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1276 if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
1277 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1283 if (mkv->allow_raw_vfw) {
1286 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1287 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1288 return AVERROR(EINVAL);
1293 if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1294 int64_t codecdelay = av_rescale_q(par->initial_padding,
1295 (AVRational){ 1, 48000 },
1296 (AVRational){ 1, 1000000000 });
1297 if (codecdelay < 0) {
1298 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1299 return AVERROR(EINVAL);
1301 // mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1302 // (AVRational){ 1, par->sample_rate },
1305 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1307 if (par->codec_id == AV_CODEC_ID_OPUS) {
1308 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1311 switch (par->codec_type) {
1312 case AVMEDIA_TYPE_VIDEO:
1313 mkv->have_video = 1;
1314 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1316 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1317 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1318 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1321 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1322 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1323 par->codec_id == AV_CODEC_ID_SVQ1 ||
1324 par->codec_id == AV_CODEC_ID_SVQ3 ||
1325 par->codec_id == AV_CODEC_ID_CINEPAK))
1329 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1330 else if (!native_id) {
1331 // if there is no mkv-specific codec ID, use VFW mode
1332 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1333 mkv->tracks[i].write_dts = 1;
1334 s->internal->avoid_negative_ts_use_pts = 0;
1337 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1339 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1340 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1342 mkv_write_field_order(pb, mkv->mode, par->field_order);
1344 // check both side data and metadata for stereo information,
1345 // write the result to the bitstream if any is found
1346 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1348 &display_height_div);
1352 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1353 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1354 (par->format == AV_PIX_FMT_YUVA420P)) {
1355 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1358 // write DisplayWidth and DisplayHeight, they contain the size of
1359 // a single source view and/or the display aspect ratio
1360 if (st->sample_aspect_ratio.num) {
1361 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1362 if (d_width > INT_MAX) {
1363 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1364 return AVERROR(EINVAL);
1366 if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
1367 if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
1368 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1369 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1371 AVRational display_aspect_ratio;
1372 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
1373 par->width * (int64_t)st->sample_aspect_ratio.num,
1374 par->height * (int64_t)st->sample_aspect_ratio.den,
1376 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
1377 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
1378 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
1381 } else if (display_width_div != 1 || display_height_div != 1) {
1382 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1383 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1384 } else if (mkv->mode != MODE_WEBM)
1385 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1387 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1388 uint32_t color_space = av_le2ne32(par->codec_tag);
1389 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1391 ret = mkv_write_video_color(pb, par, st);
1394 ret = mkv_write_video_projection(s, pb, st);
1397 end_ebml_master(pb, subinfo);
1400 case AVMEDIA_TYPE_AUDIO:
1401 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1404 // no mkv-specific ID, use ACM mode
1405 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1407 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1408 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1410 mkv->tracks[i].sample_rate_offset = avio_tell(pb);
1411 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1412 if (output_sample_rate)
1413 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1415 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1416 end_ebml_master(pb, subinfo);
1419 case AVMEDIA_TYPE_SUBTITLE:
1421 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1422 return AVERROR(ENOSYS);
1425 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1426 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1428 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1431 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1432 return AVERROR(EINVAL);
1435 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1436 mkv->tracks[i].codecpriv_offset = avio_tell(pb);
1437 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1442 end_ebml_master(pb, track);
1447 static int mkv_write_tracks(AVFormatContext *s)
1449 MatroskaMuxContext *mkv = s->priv_data;
1450 AVIOContext *pb = s->pb;
1451 int i, ret, default_stream_exists = 0;
1453 ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1457 ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, &mkv->tracks_master, MATROSKA_ID_TRACKS, 0);
1461 for (i = 0; i < s->nb_streams; i++) {
1462 AVStream *st = s->streams[i];
1463 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1465 for (i = 0; i < s->nb_streams; i++) {
1466 ret = mkv_write_track(s, mkv, i, mkv->tracks_bc, default_stream_exists);
1471 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1472 end_ebml_master_crc32_preliminary(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
1474 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
1479 static int mkv_write_chapters(AVFormatContext *s)
1481 MatroskaMuxContext *mkv = s->priv_data;
1482 AVIOContext *dyn_cp, *pb = s->pb;
1483 ebml_master chapters, editionentry;
1484 AVRational scale = {1, 1E9};
1487 if (!s->nb_chapters || mkv->wrote_chapters)
1490 ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1491 if (ret < 0) return ret;
1493 ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &chapters, MATROSKA_ID_CHAPTERS, 0);
1494 if (ret < 0) return ret;
1496 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1497 if (mkv->mode != MODE_WEBM) {
1498 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1499 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1501 for (i = 0; i < s->nb_chapters; i++) {
1502 ebml_master chapteratom, chapterdisplay;
1503 AVChapter *c = s->chapters[i];
1504 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1505 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1506 AVDictionaryEntry *t = NULL;
1507 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1508 av_log(s, AV_LOG_ERROR,
1509 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1510 chapterstart, chapterend);
1511 return AVERROR_INVALIDDATA;
1514 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1515 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1516 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1517 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1518 if (mkv->mode != MODE_WEBM) {
1519 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1520 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1522 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1523 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1524 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1525 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1526 end_ebml_master(dyn_cp, chapterdisplay);
1528 end_ebml_master(dyn_cp, chapteratom);
1530 end_ebml_master(dyn_cp, editionentry);
1531 end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
1533 mkv->wrote_chapters = 1;
1537 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1539 uint8_t *key = av_strdup(t->key);
1541 const uint8_t *lang = NULL;
1545 return AVERROR(ENOMEM);
1547 if ((p = strrchr(p, '-')) &&
1548 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1555 else if (*p >= 'a' && *p <= 'z')
1560 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1561 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1563 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1564 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1565 end_ebml_master(pb, tag);
1571 static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
1572 unsigned int uid, ebml_master *tags,
1576 MatroskaMuxContext *mkv = s->priv_data;
1577 ebml_master targets;
1581 ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1582 if (ret < 0) return ret;
1584 start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, tags, MATROSKA_ID_TAGS, 0);
1588 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1589 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1591 put_ebml_uint(pb, elementid, uid);
1592 end_ebml_master(pb, targets);
1596 static int mkv_check_tag_name(const char *name, uint32_t elementid)
1598 return av_strcasecmp(name, "title") &&
1599 av_strcasecmp(name, "stereo_mode") &&
1600 av_strcasecmp(name, "creation_time") &&
1601 av_strcasecmp(name, "encoding_tool") &&
1602 av_strcasecmp(name, "duration") &&
1603 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1604 av_strcasecmp(name, "language")) &&
1605 (elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1606 (av_strcasecmp(name, "filename") &&
1607 av_strcasecmp(name, "mimetype")));
1610 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, uint32_t elementid,
1611 unsigned int uid, ebml_master *tags)
1613 MatroskaMuxContext *mkv = s->priv_data;
1616 AVDictionaryEntry *t = NULL;
1618 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1622 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1623 if (mkv_check_tag_name(t->key, elementid)) {
1624 ret = mkv_write_simpletag(mkv->tags_bc, t);
1630 end_ebml_master(mkv->tags_bc, tag);
1634 static int mkv_check_tag(AVDictionary *m, uint32_t elementid)
1636 AVDictionaryEntry *t = NULL;
1638 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1639 if (mkv_check_tag_name(t->key, elementid))
1645 static int mkv_write_tags(AVFormatContext *s)
1647 MatroskaMuxContext *mkv = s->priv_data;
1650 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1652 if (mkv_check_tag(s->metadata, 0)) {
1653 ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
1654 if (ret < 0) return ret;
1657 for (i = 0; i < s->nb_streams; i++) {
1658 AVStream *st = s->streams[i];
1660 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1663 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1666 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
1667 if (ret < 0) return ret;
1670 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
1671 for (i = 0; i < s->nb_streams; i++) {
1673 AVStream *st = s->streams[i];
1674 ebml_master tag_target;
1677 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1680 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
1683 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1684 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1685 mkv->stream_duration_offsets[i] = avio_tell(pb);
1687 // Reserve space to write duration as a 20-byte string.
1688 // 2 (ebml id) + 1 (data size) + 20 (data)
1689 put_ebml_void(pb, 23);
1690 end_ebml_master(pb, tag);
1691 end_ebml_master(pb, tag_target);
1695 if (mkv->mode != MODE_WEBM) {
1696 for (i = 0; i < s->nb_chapters; i++) {
1697 AVChapter *ch = s->chapters[i];
1699 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1702 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
1708 if (mkv->have_attachments && mkv->mode != MODE_WEBM) {
1709 for (i = 0; i < mkv->attachments->num_entries; i++) {
1710 mkv_attachment *attachment = &mkv->attachments->entries[i];
1711 AVStream *st = s->streams[attachment->stream_idx];
1713 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1716 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid, &mkv->tags);
1722 if (mkv->tags.pos) {
1723 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1724 end_ebml_master_crc32_preliminary(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1726 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1731 static int mkv_write_attachments(AVFormatContext *s)
1733 MatroskaMuxContext *mkv = s->priv_data;
1734 AVIOContext *dyn_cp, *pb = s->pb;
1735 ebml_master attachments;
1739 if (!mkv->have_attachments)
1742 mkv->attachments = av_mallocz(sizeof(*mkv->attachments));
1743 if (!mkv->attachments)
1744 return AVERROR(ENOMEM);
1746 av_lfg_init(&c, av_get_random_seed());
1748 ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1749 if (ret < 0) return ret;
1751 ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &attachments, MATROSKA_ID_ATTACHMENTS, 0);
1752 if (ret < 0) return ret;
1754 for (i = 0; i < s->nb_streams; i++) {
1755 AVStream *st = s->streams[i];
1756 ebml_master attached_file;
1757 mkv_attachment *attachment = mkv->attachments->entries;
1758 AVDictionaryEntry *t;
1759 const char *mimetype = NULL;
1762 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1765 attachment = av_realloc_array(attachment, mkv->attachments->num_entries + 1, sizeof(mkv_attachment));
1767 return AVERROR(ENOMEM);
1768 mkv->attachments->entries = attachment;
1770 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1772 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1773 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1774 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1775 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1776 return AVERROR(EINVAL);
1778 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1779 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1780 mimetype = t->value;
1781 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1783 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1784 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1785 mimetype = ff_mkv_mime_tags[i].str;
1788 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1789 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1790 mimetype = ff_mkv_image_mime_tags[i].str;
1795 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1796 "it cannot be deduced from the codec id.\n", i);
1797 return AVERROR(EINVAL);
1800 if (s->flags & AVFMT_FLAG_BITEXACT) {
1801 struct AVSHA *sha = av_sha_alloc();
1804 return AVERROR(ENOMEM);
1805 av_sha_init(sha, 160);
1806 av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1807 av_sha_final(sha, digest);
1809 fileuid = AV_RL32(digest);
1811 fileuid = av_lfg_get(&c);
1813 av_log(s, AV_LOG_VERBOSE, "Using %.8"PRIx32" for attachment %d\n",
1814 fileuid, mkv->attachments->num_entries);
1816 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1817 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1818 put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1819 end_ebml_master(dyn_cp, attached_file);
1821 mkv->attachments->entries[mkv->attachments->num_entries].stream_idx = i;
1822 mkv->attachments->entries[mkv->attachments->num_entries++].fileuid = fileuid;
1824 end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
1829 static int64_t get_metadata_duration(AVFormatContext *s)
1835 AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1836 if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1837 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1841 for (i = 0; i < s->nb_streams; i++) {
1843 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1845 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1846 max = FFMAX(max, us);
1849 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1853 static int mkv_write_header(AVFormatContext *s)
1855 MatroskaMuxContext *mkv = s->priv_data;
1856 AVIOContext *pb = s->pb;
1857 ebml_master ebml_header;
1858 AVDictionaryEntry *tag;
1859 int ret, i, version = 2;
1860 int64_t creation_time;
1862 if (!strcmp(s->oformat->name, "webm")) {
1863 mkv->mode = MODE_WEBM;
1866 mkv->mode = MODE_MATROSKAv2;
1868 if (mkv->mode != MODE_WEBM ||
1869 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1870 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1873 for (i = 0; i < s->nb_streams; i++) {
1874 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1875 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1876 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1880 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1882 ret = AVERROR(ENOMEM);
1885 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, MAX_EBML_HEADER_SIZE);
1886 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1887 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1888 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1889 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1890 put_ebml_string(pb, EBML_ID_DOCTYPE , s->oformat->name);
1891 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1892 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION, 2);
1893 end_ebml_master(pb, ebml_header);
1895 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1896 mkv->segment_offset = avio_tell(pb);
1898 // we write a seek head at the beginning to point to all other level
1899 // one elements, which aren't more than 10 elements as we write only one
1900 // of every other currently defined level 1 element
1901 mkv->seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1902 if (!mkv->seekhead) {
1903 ret = AVERROR(ENOMEM);
1907 ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1908 if (ret < 0) goto fail;
1910 ret = start_ebml_master_crc32(pb, &mkv->info_bc, mkv, &mkv->info, MATROSKA_ID_INFO, 0);
1915 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1916 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1917 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1918 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1919 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1920 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1921 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1923 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1925 if (mkv->mode != MODE_WEBM) {
1926 uint32_t segment_uid[4];
1929 av_lfg_init(&lfg, av_get_random_seed());
1931 for (i = 0; i < 4; i++)
1932 segment_uid[i] = av_lfg_get(&lfg);
1934 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1937 const char *ident = "Lavf";
1938 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1939 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1942 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1943 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1944 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1945 uint8_t date_utc_buf[8];
1946 AV_WB64(date_utc_buf, date_utc);
1947 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1950 // reserve space for the duration
1952 mkv->duration_offset = avio_tell(pb);
1953 if (!mkv->is_live) {
1954 int64_t metadata_duration = get_metadata_duration(s);
1956 if (s->duration > 0) {
1957 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1958 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1959 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1960 } else if (metadata_duration > 0) {
1961 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1962 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1963 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1965 put_ebml_void(pb, 11); // assumes double-precision float to be written
1968 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1969 end_ebml_master_crc32_preliminary(s->pb, &mkv->info_bc, mkv, mkv->info);
1971 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
1974 // initialize stream_duration fields
1975 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1976 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1977 if (!mkv->stream_durations || !mkv->stream_duration_offsets) {
1978 ret = AVERROR(ENOMEM);
1982 ret = mkv_write_tracks(s);
1986 for (i = 0; i < s->nb_chapters; i++)
1987 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1989 ret = mkv_write_chapters(s);
1993 if (mkv->mode != MODE_WEBM) {
1994 ret = mkv_write_attachments(s);
1999 ret = mkv_write_tags(s);
2003 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
2004 mkv_write_seekhead(pb, mkv);
2006 mkv->cues = mkv_start_cues(mkv->segment_offset);
2008 ret = AVERROR(ENOMEM);
2012 if (s->metadata_header_padding > 0) {
2013 if (s->metadata_header_padding == 1)
2014 s->metadata_header_padding++;
2015 put_ebml_void(pb, s->metadata_header_padding);
2018 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && mkv->reserve_cues_space) {
2019 mkv->cues_pos = avio_tell(pb);
2020 if (mkv->reserve_cues_space == 1)
2021 mkv->reserve_cues_space++;
2022 put_ebml_void(pb, mkv->reserve_cues_space);
2025 av_init_packet(&mkv->cur_audio_pkt);
2026 mkv->cur_audio_pkt.size = 0;
2027 mkv->cluster_pos = -1;
2031 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2032 // after 4k and on a keyframe
2033 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
2034 if (mkv->cluster_time_limit < 0)
2035 mkv->cluster_time_limit = 5000;
2036 if (mkv->cluster_size_limit < 0)
2037 mkv->cluster_size_limit = 5 * 1024 * 1024;
2039 if (mkv->cluster_time_limit < 0)
2040 mkv->cluster_time_limit = 1000;
2041 if (mkv->cluster_size_limit < 0)
2042 mkv->cluster_size_limit = 32 * 1024;
2051 static int mkv_blockgroup_size(int pkt_size)
2053 int size = pkt_size + 4;
2054 size += ebml_num_size(size);
2055 size += 2; // EBML ID for block and block duration
2056 size += 9; // max size of block duration incl. length field
2060 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
2067 dst = av_malloc(srclen);
2069 return AVERROR(ENOMEM);
2071 while (srclen >= WV_HEADER_SIZE) {
2074 ret = ff_wv_parse_header(&header, src);
2077 src += WV_HEADER_SIZE;
2078 srclen -= WV_HEADER_SIZE;
2080 if (srclen < header.blocksize) {
2081 ret = AVERROR_INVALIDDATA;
2085 if (header.initial) {
2086 AV_WL32(dst + offset, header.samples);
2089 AV_WL32(dst + offset, header.flags);
2090 AV_WL32(dst + offset + 4, header.crc);
2093 if (!(header.initial && header.final)) {
2094 AV_WL32(dst + offset, header.blocksize);
2098 memcpy(dst + offset, src, header.blocksize);
2099 src += header.blocksize;
2100 srclen -= header.blocksize;
2101 offset += header.blocksize;
2113 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
2114 uint32_t blockid, AVPacket *pkt, int keyframe)
2116 MatroskaMuxContext *mkv = s->priv_data;
2117 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2118 uint8_t *data = NULL, *side_data = NULL;
2119 int offset = 0, size = pkt->size, side_data_size = 0;
2120 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2121 uint64_t additional_id = 0;
2122 int64_t discard_padding = 0;
2123 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
2124 ebml_master block_group, block_additions, block_more;
2126 ts += mkv->tracks[pkt->stream_index].ts_offset;
2128 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2129 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
2130 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
2132 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
2133 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
2134 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
2135 else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
2136 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
2137 /* extradata is Annex B, assume the bitstream is too and convert it */
2138 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
2139 else if (par->codec_id == AV_CODEC_ID_AV1)
2140 ff_av1_filter_obus_buf(pkt->data, &data, &size);
2141 else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
2142 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
2144 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
2150 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
2151 /* Matroska specification requires to remove the first QuickTime atom
2157 side_data = av_packet_get_side_data(pkt,
2158 AV_PKT_DATA_SKIP_SAMPLES,
2161 if (side_data && side_data_size >= 10) {
2162 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
2163 (AVRational){1, par->sample_rate},
2164 (AVRational){1, 1000000000});
2167 side_data = av_packet_get_side_data(pkt,
2168 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2171 additional_id = AV_RB64(side_data);
2173 side_data_size -= 8;
2176 if ((side_data_size && additional_id == 1) || discard_padding) {
2177 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
2178 blockid = MATROSKA_ID_BLOCK;
2181 put_ebml_id(pb, blockid);
2182 put_ebml_num(pb, size + 4, 0);
2183 // this assumes stream_index is less than 126
2184 avio_w8(pb, 0x80 | track_number);
2185 avio_wb16(pb, ts - mkv->cluster_pts);
2186 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
2187 avio_write(pb, data + offset, size);
2188 if (data != pkt->data)
2191 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
2192 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
2193 mkv->last_track_timestamp[track_number - 1]);
2195 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
2197 if (discard_padding) {
2198 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
2201 if (side_data_size && additional_id == 1) {
2202 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2203 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2204 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
2205 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
2206 put_ebml_num(pb, side_data_size, 0);
2207 avio_write(pb, side_data, side_data_size);
2208 end_ebml_master(pb, block_more);
2209 end_ebml_master(pb, block_additions);
2211 if ((side_data_size && additional_id == 1) || discard_padding) {
2212 end_ebml_master(pb, block_group);
2216 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
2218 MatroskaMuxContext *mkv = s->priv_data;
2219 ebml_master blockgroup;
2220 int id_size, settings_size, size;
2221 uint8_t *id, *settings;
2222 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2223 const int flags = 0;
2226 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2230 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2233 size = id_size + 1 + settings_size + 1 + pkt->size;
2235 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2236 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
2237 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
2239 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
2241 put_ebml_id(pb, MATROSKA_ID_BLOCK);
2242 put_ebml_num(pb, size + 4, 0);
2243 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
2244 avio_wb16(pb, ts - mkv->cluster_pts);
2246 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2248 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2249 end_ebml_master(pb, blockgroup);
2251 return pkt->duration;
2254 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
2256 MatroskaMuxContext *mkv = s->priv_data;
2258 end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, mkv->cluster);
2259 mkv->cluster_pos = -1;
2260 av_log(s, AV_LOG_DEBUG,
2261 "Starting new cluster at offset %" PRIu64 " bytes, "
2262 "pts %" PRIu64 ", dts %" PRIu64 "\n",
2263 avio_tell(s->pb), pkt->pts, pkt->dts);
2267 static int mkv_check_new_extra_data(AVFormatContext *s, AVPacket *pkt)
2269 MatroskaMuxContext *mkv = s->priv_data;
2270 mkv_track *track = &mkv->tracks[pkt->stream_index];
2271 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2273 int side_data_size = 0, ret;
2275 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
2278 switch (par->codec_id) {
2279 case AV_CODEC_ID_AAC:
2280 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2281 int filler, output_sample_rate = 0;
2283 ret = get_aac_sample_rates(s, side_data, side_data_size, &track->sample_rate,
2284 &output_sample_rate);
2287 if (!output_sample_rate)
2288 output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
2289 av_freep(&par->extradata);
2290 ret = ff_alloc_extradata(par, side_data_size);
2293 memcpy(par->extradata, side_data, side_data_size);
2294 curpos = avio_tell(mkv->tracks_bc);
2295 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2296 mkv_write_codecprivate(s, mkv->tracks_bc, par, 1, 0);
2297 filler = MAX_PCE_SIZE + 2 + 4 - (avio_tell(mkv->tracks_bc) - track->codecpriv_offset);
2299 put_ebml_void(mkv->tracks_bc, filler);
2300 avio_seek(mkv->tracks_bc, track->sample_rate_offset, SEEK_SET);
2301 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
2302 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
2303 avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2304 } else if (!par->extradata_size && !track->sample_rate) {
2305 // No extradata (codecpar or packet side data).
2306 av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
2307 return AVERROR(EINVAL);
2310 case AV_CODEC_ID_FLAC:
2311 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2312 AVCodecParameters *codecpriv_par;
2314 if (side_data_size != par->extradata_size) {
2315 av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
2317 return AVERROR(EINVAL);
2319 codecpriv_par = avcodec_parameters_alloc();
2321 return AVERROR(ENOMEM);
2322 ret = avcodec_parameters_copy(codecpriv_par, par);
2324 avcodec_parameters_free(&codecpriv_par);
2327 memcpy(codecpriv_par->extradata, side_data, side_data_size);
2328 curpos = avio_tell(mkv->tracks_bc);
2329 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2330 mkv_write_codecprivate(s, mkv->tracks_bc, codecpriv_par, 1, 0);
2331 avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2332 avcodec_parameters_free(&codecpriv_par);
2335 // FIXME: Remove the following once libaom starts propagating extradata during init()
2336 // See https://bugs.chromium.org/p/aomedia/issues/detail?id=2012
2337 case AV_CODEC_ID_AV1:
2338 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live &&
2339 !par->extradata_size) {
2340 AVIOContext *dyn_cp;
2344 ret = avio_open_dyn_buf(&dyn_cp);
2347 ff_isom_write_av1c(dyn_cp, side_data, side_data_size);
2348 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
2349 if (!codecpriv_size) {
2351 return AVERROR_INVALIDDATA;
2353 curpos = avio_tell(mkv->tracks_bc);
2354 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2355 // Do not write the OBUs as we don't have space saved for them
2356 put_ebml_binary(mkv->tracks_bc, MATROSKA_ID_CODECPRIVATE, codecpriv, 4);
2358 avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2359 ret = ff_alloc_extradata(par, side_data_size);
2362 memcpy(par->extradata, side_data, side_data_size);
2363 } else if (!par->extradata_size)
2364 return AVERROR_INVALIDDATA;
2368 av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
2375 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2377 MatroskaMuxContext *mkv = s->priv_data;
2378 AVIOContext *pb = s->pb;
2379 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2380 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2381 int duration = pkt->duration;
2383 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2384 int64_t relative_packet_pos;
2385 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
2387 if (ts == AV_NOPTS_VALUE) {
2388 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2389 return AVERROR(EINVAL);
2391 ts += mkv->tracks[pkt->stream_index].ts_offset;
2393 if (mkv->cluster_pos != -1) {
2394 int64_t cluster_time = ts - mkv->cluster_pts;
2395 if ((int16_t)cluster_time != cluster_time) {
2396 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2397 mkv_start_new_cluster(s, pkt);
2401 if (mkv->cluster_pos == -1) {
2402 mkv->cluster_pos = avio_tell(s->pb);
2403 ret = start_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, &mkv->cluster, MATROSKA_ID_CLUSTER, 0);
2406 put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2407 mkv->cluster_pts = FFMAX(0, ts);
2409 pb = mkv->cluster_bc;
2411 relative_packet_pos = avio_tell(pb);
2413 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2414 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2415 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2416 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
2417 if (ret < 0) return ret;
2420 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2421 duration = mkv_write_vtt_blocks(s, pb, pkt);
2423 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2424 mkv_blockgroup_size(pkt->size));
2426 #if FF_API_CONVERGENCE_DURATION
2427 FF_DISABLE_DEPRECATION_WARNINGS
2428 /* For backward compatibility, prefer convergence_duration. */
2429 if (pkt->convergence_duration > 0) {
2430 duration = pkt->convergence_duration;
2432 FF_ENABLE_DEPRECATION_WARNINGS
2434 /* All subtitle blocks are considered to be keyframes. */
2435 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2436 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2437 end_ebml_master(pb, blockgroup);
2440 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
2441 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
2442 mkv->cluster_pos, relative_packet_pos, duration);
2448 mkv->duration = FFMAX(mkv->duration, ts + duration);
2450 if (mkv->stream_durations)
2451 mkv->stream_durations[pkt->stream_index] =
2452 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
2457 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2459 MatroskaMuxContext *mkv = s->priv_data;
2460 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2461 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2463 int64_t cluster_time;
2465 int start_new_cluster;
2467 ret = mkv_check_new_extra_data(s, pkt);
2471 if (mkv->tracks[pkt->stream_index].write_dts)
2472 cluster_time = pkt->dts - mkv->cluster_pts;
2474 cluster_time = pkt->pts - mkv->cluster_pts;
2475 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2477 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2478 // after 4k and on a keyframe
2479 cluster_size = avio_tell(mkv->cluster_bc);
2481 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2482 // WebM DASH specification states that the first block of every cluster
2483 // has to be a key frame. So for DASH video, we only create a cluster
2484 // on seeing key frames.
2485 start_new_cluster = keyframe;
2486 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2487 (mkv->cluster_pos == -1 ||
2488 cluster_time > mkv->cluster_time_limit)) {
2489 // For DASH audio, we create a Cluster based on cluster_time_limit
2490 start_new_cluster = 1;
2491 } else if (!mkv->is_dash &&
2492 (cluster_size > mkv->cluster_size_limit ||
2493 cluster_time > mkv->cluster_time_limit ||
2494 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2495 cluster_size > 4 * 1024))) {
2496 start_new_cluster = 1;
2498 start_new_cluster = 0;
2501 if (mkv->cluster_pos != -1 && start_new_cluster) {
2502 mkv_start_new_cluster(s, pkt);
2505 if (!mkv->cluster_pos)
2506 avio_write_marker(s->pb,
2507 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2508 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2510 // check if we have an audio packet cached
2511 if (mkv->cur_audio_pkt.size > 0) {
2512 // for DASH audio, a CuePoint has to be added when there is a new cluster.
2513 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2514 mkv->is_dash ? start_new_cluster : 0);
2515 av_packet_unref(&mkv->cur_audio_pkt);
2517 av_log(s, AV_LOG_ERROR,
2518 "Could not write cached audio packet ret:%d\n", ret);
2523 // buffer an audio packet to ensure the packet containing the video
2524 // keyframe's timecode is contained in the same cluster for WebM
2525 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2527 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2529 ret = mkv_write_packet_internal(s, pkt, 0);
2533 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2535 MatroskaMuxContext *mkv = s->priv_data;
2538 if (mkv->cluster_pos != -1) {
2539 end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, mkv->cluster);
2540 mkv->cluster_pos = -1;
2541 av_log(s, AV_LOG_DEBUG,
2542 "Flushing cluster at offset %" PRIu64 " bytes\n",
2548 return mkv_write_packet(s, pkt);
2551 static int mkv_write_trailer(AVFormatContext *s)
2553 MatroskaMuxContext *mkv = s->priv_data;
2554 AVIOContext *pb = s->pb;
2555 int64_t currentpos, cuespos;
2558 // check if we have an audio packet cached
2559 if (mkv->cur_audio_pkt.size > 0) {
2560 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2561 av_packet_unref(&mkv->cur_audio_pkt);
2563 av_log(s, AV_LOG_ERROR,
2564 "Could not write cached audio packet ret:%d\n", ret);
2569 if (mkv->cluster_bc) {
2570 end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv, mkv->cluster);
2573 ret = mkv_write_chapters(s);
2578 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2579 if (mkv->cues->num_entries) {
2580 if (mkv->reserve_cues_space) {
2583 currentpos = avio_tell(pb);
2584 avio_seek(pb, mkv->cues_pos, SEEK_SET);
2586 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2587 cues_end = avio_tell(pb);
2588 if (cues_end > cuespos + mkv->reserve_cues_space) {
2589 av_log(s, AV_LOG_ERROR,
2590 "Insufficient space reserved for cues: %d "
2591 "(needed: %" PRId64 ").\n",
2592 mkv->reserve_cues_space, cues_end - cuespos);
2593 return AVERROR(EINVAL);
2596 if (cues_end < cuespos + mkv->reserve_cues_space)
2597 put_ebml_void(pb, mkv->reserve_cues_space -
2598 (cues_end - cuespos));
2600 avio_seek(pb, currentpos, SEEK_SET);
2602 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2605 ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_CUES,
2611 mkv_write_seekhead(pb, mkv);
2613 // update the duration
2614 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2615 currentpos = avio_tell(pb);
2616 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2617 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2618 avio_seek(pb, mkv->info.pos, SEEK_SET);
2619 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
2621 // write tracks master
2622 avio_seek(pb, mkv->tracks_master.pos, SEEK_SET);
2623 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
2625 // update stream durations
2626 if (!mkv->is_live && mkv->stream_durations) {
2628 int64_t curr = avio_tell(mkv->tags_bc);
2629 for (i = 0; i < s->nb_streams; ++i) {
2630 AVStream *st = s->streams[i];
2632 if (mkv->stream_duration_offsets[i] > 0) {
2633 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2634 char duration_string[20] = "";
2636 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2637 mkv->stream_durations[i]);
2639 avio_seek(mkv->tags_bc, mkv->stream_duration_offsets[i], SEEK_SET);
2641 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2642 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2643 fmod(duration_sec, 60));
2645 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2648 avio_seek(mkv->tags_bc, curr, SEEK_SET);
2650 if (mkv->tags.pos && !mkv->is_live) {
2651 avio_seek(pb, mkv->tags.pos, SEEK_SET);
2652 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
2655 avio_seek(pb, currentpos, SEEK_SET);
2658 if (!mkv->is_live) {
2659 end_ebml_master(pb, mkv->segment);
2666 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2669 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2670 if (ff_mkv_codec_tags[i].id == codec_id)
2673 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2674 enum AVMediaType type = avcodec_get_type(codec_id);
2675 // mkv theoretically supports any video/audio through VFW/ACM
2676 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2683 static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
2686 for (i = 0; ff_webm_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2687 if (ff_webm_codec_tags[i].id == codec_id)
2693 static int mkv_init(struct AVFormatContext *s)
2697 if (s->nb_streams > MAX_TRACKS) {
2698 av_log(s, AV_LOG_ERROR,
2699 "At most %d streams are supported for muxing in Matroska\n",
2701 return AVERROR(EINVAL);
2704 for (i = 0; i < s->nb_streams; i++) {
2705 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
2706 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
2707 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
2708 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
2709 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
2710 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
2711 av_log(s, AV_LOG_ERROR,
2712 "The Matroska muxer does not yet support muxing %s\n",
2713 avcodec_get_name(s->streams[i]->codecpar->codec_id));
2714 return AVERROR_PATCHWELCOME;
2718 if (s->avoid_negative_ts < 0) {
2719 s->avoid_negative_ts = 1;
2720 s->internal->avoid_negative_ts_use_pts = 1;
2723 for (i = 0; i < s->nb_streams; i++) {
2724 // ms precision is the de-facto standard timescale for mkv files
2725 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2731 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2734 AVStream *st = s->streams[pkt->stream_index];
2736 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2737 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2738 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2739 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2740 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2746 static const AVCodecTag additional_audio_tags[] = {
2747 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2748 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2749 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2750 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2751 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2752 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2753 { AV_CODEC_ID_QDMC, 0xFFFFFFFF },
2754 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2755 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2756 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2757 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2758 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2759 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2762 static const AVCodecTag additional_video_tags[] = {
2763 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2764 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2765 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2766 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2769 static const AVCodecTag additional_subtitle_tags[] = {
2770 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2771 { AV_CODEC_ID_DVD_SUBTITLE, 0xFFFFFFFF },
2772 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2773 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2776 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2777 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2778 static const AVOption options[] = {
2779 { "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 },
2780 { "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 },
2781 { "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 },
2782 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2783 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2784 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2785 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2786 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2790 #if CONFIG_MATROSKA_MUXER
2791 static const AVClass matroska_class = {
2792 .class_name = "matroska muxer",
2793 .item_name = av_default_item_name,
2795 .version = LIBAVUTIL_VERSION_INT,
2798 AVOutputFormat ff_matroska_muxer = {
2800 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2801 .mime_type = "video/x-matroska",
2802 .extensions = "mkv",
2803 .priv_data_size = sizeof(MatroskaMuxContext),
2804 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2805 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2806 .video_codec = CONFIG_LIBX264_ENCODER ?
2807 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2809 .write_header = mkv_write_header,
2810 .write_packet = mkv_write_flush_packet,
2811 .write_trailer = mkv_write_trailer,
2812 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2813 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2814 .codec_tag = (const AVCodecTag* const []){
2815 ff_codec_bmp_tags, ff_codec_wav_tags,
2816 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2818 .subtitle_codec = AV_CODEC_ID_ASS,
2819 .query_codec = mkv_query_codec,
2820 .check_bitstream = mkv_check_bitstream,
2821 .priv_class = &matroska_class,
2825 #if CONFIG_WEBM_MUXER
2826 static const AVClass webm_class = {
2827 .class_name = "webm muxer",
2828 .item_name = av_default_item_name,
2830 .version = LIBAVUTIL_VERSION_INT,
2833 AVOutputFormat ff_webm_muxer = {
2835 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2836 .mime_type = "video/webm",
2837 .extensions = "webm",
2838 .priv_data_size = sizeof(MatroskaMuxContext),
2839 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2840 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2841 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2843 .write_header = mkv_write_header,
2844 .write_packet = mkv_write_flush_packet,
2845 .write_trailer = mkv_write_trailer,
2846 .query_codec = webm_query_codec,
2847 .check_bitstream = mkv_check_bitstream,
2848 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2849 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2850 .priv_class = &webm_class,
2854 #if CONFIG_MATROSKA_AUDIO_MUXER
2855 static const AVClass mka_class = {
2856 .class_name = "matroska audio muxer",
2857 .item_name = av_default_item_name,
2859 .version = LIBAVUTIL_VERSION_INT,
2861 AVOutputFormat ff_matroska_audio_muxer = {
2863 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2864 .mime_type = "audio/x-matroska",
2865 .extensions = "mka",
2866 .priv_data_size = sizeof(MatroskaMuxContext),
2867 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2868 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2869 .video_codec = AV_CODEC_ID_NONE,
2871 .write_header = mkv_write_header,
2872 .write_packet = mkv_write_flush_packet,
2873 .write_trailer = mkv_write_trailer,
2874 .check_bitstream = mkv_check_bitstream,
2875 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2877 .codec_tag = (const AVCodecTag* const []){
2878 ff_codec_wav_tags, additional_audio_tags, 0
2880 .priv_class = &mka_class,