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 "vorbiscomment.h"
38 #include "libavutil/avstring.h"
39 #include "libavutil/channel_layout.h"
40 #include "libavutil/crc.h"
41 #include "libavutil/dict.h"
42 #include "libavutil/intfloat.h"
43 #include "libavutil/intreadwrite.h"
44 #include "libavutil/lfg.h"
45 #include "libavutil/mastering_display_metadata.h"
46 #include "libavutil/mathematics.h"
47 #include "libavutil/opt.h"
48 #include "libavutil/parseutils.h"
49 #include "libavutil/random_seed.h"
50 #include "libavutil/rational.h"
51 #include "libavutil/samplefmt.h"
52 #include "libavutil/stereo3d.h"
54 #include "libavcodec/xiph.h"
55 #include "libavcodec/mpeg4audio.h"
57 /* Level 1 elements we create a SeekHead entry for:
58 * Info, Tracks, Chapters, Attachments, Tags and Cues */
59 #define MAX_SEEKHEAD_ENTRIES 6
63 DEFAULT_MODE_INFER_NO_SUBS,
64 DEFAULT_MODE_PASSTHROUGH,
67 typedef struct ebml_master {
68 int64_t pos; ///< absolute offset in the containing AVIOContext where the master's elements start
69 int sizebytes; ///< how many bytes were reserved for the size
72 typedef struct mkv_seekhead_entry {
77 typedef struct mkv_seekhead {
79 mkv_seekhead_entry entries[MAX_SEEKHEAD_ENTRIES];
84 typedef struct mkv_cuepoint {
87 int64_t cluster_pos; ///< offset of the cluster containing the block relative to the segment
88 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
89 int64_t duration; ///< duration of the block according to time base
92 typedef struct mkv_cues {
93 mkv_cuepoint *entries;
97 typedef struct mkv_track {
104 int64_t sample_rate_offset;
105 int64_t last_timestamp;
107 int64_t duration_offset;
108 int64_t codecpriv_offset;
112 #define MODE_MATROSKAv2 0x01
113 #define MODE_WEBM 0x02
115 typedef struct MatroskaMuxContext {
116 const AVClass *class;
118 AVIOContext *tags_bc;
120 AVIOContext *info_bc;
122 AVIOContext *tracks_bc;
125 int64_t segment_offset;
126 AVIOContext *cluster_bc;
127 int64_t cluster_pos; ///< file offset of the current cluster
129 int64_t duration_offset;
131 mkv_seekhead seekhead;
135 AVPacket cur_audio_pkt;
137 unsigned nb_attachments;
140 int reserve_cues_space;
141 int cluster_size_limit;
143 int64_t cluster_time_limit;
145 int dash_track_number;
149 uint32_t chapter_id_offset;
155 uint32_t segment_uid[4];
156 } MatroskaMuxContext;
158 /** 2 bytes * 7 for EBML IDs, 7 1-byte EBML lengths, 6 1-byte uint,
159 * 8 byte for "matroska" doctype string */
160 #define MAX_EBML_HEADER_SIZE 35
162 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
163 * offset, 4 bytes for target EBML ID */
164 #define MAX_SEEKENTRY_SIZE 21
166 /** 4 * (1-byte EBML ID, 1-byte EBML size, 8-byte uint max) */
167 #define MAX_CUETRACKPOS_SIZE 40
169 /** Seek preroll value for opus */
170 #define OPUS_SEEK_PREROLL 80000000
172 static int ebml_id_size(uint32_t id)
174 return (av_log2(id) + 7U) / 8;
177 static void put_ebml_id(AVIOContext *pb, uint32_t id)
179 int i = ebml_id_size(id);
181 avio_w8(pb, (uint8_t)(id >> (i * 8)));
185 * Write an EBML size meaning "unknown size".
187 * @param bytes The number of bytes the size should occupy (maximum: 8).
189 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
191 av_assert0(bytes <= 8);
192 avio_w8(pb, 0x1ff >> bytes);
193 ffio_fill(pb, 0xff, bytes - 1);
197 * Returns how many bytes are needed to represent a number
198 * as EBML variable length integer.
200 static int ebml_num_size(uint64_t num)
210 * Calculate how many bytes are needed to represent the length field
211 * of an EBML element whose payload has a given length.
213 static int ebml_length_size(uint64_t length)
215 return ebml_num_size(length + 1);
219 * Write a number as EBML variable length integer on `bytes` bytes.
220 * `bytes` is taken literally without checking.
222 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
224 num |= 1ULL << bytes * 7;
225 for (int i = bytes - 1; i >= 0; i--)
226 avio_w8(pb, (uint8_t)(num >> i * 8));
230 * Write a length as EBML variable length integer.
232 * @param bytes The number of bytes that need to be used to write the number.
233 * If zero, the minimal number of bytes will be used.
235 static void put_ebml_length(AVIOContext *pb, uint64_t length, int bytes)
237 int needed_bytes = ebml_length_size(length);
239 // sizes larger than this are currently undefined in EBML
240 av_assert0(length < (1ULL << 56) - 1);
243 bytes = needed_bytes;
244 // The bytes needed to write the given size must not exceed
245 // the bytes that we ought to use.
246 av_assert0(bytes >= needed_bytes);
247 put_ebml_num(pb, length, bytes);
251 * Write a (random) UID with fixed size to make the output more deterministic
253 static void put_ebml_uid(AVIOContext *pb, uint32_t elementid, uint64_t uid)
255 put_ebml_id(pb, elementid);
256 put_ebml_length(pb, 8, 0);
260 static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
267 put_ebml_id(pb, elementid);
268 put_ebml_length(pb, bytes, 0);
269 for (i = bytes - 1; i >= 0; i--)
270 avio_w8(pb, (uint8_t)(val >> i * 8));
273 static void put_ebml_sint(AVIOContext *pb, uint32_t elementid, int64_t val)
276 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
281 put_ebml_id(pb, elementid);
282 put_ebml_length(pb, bytes, 0);
283 for (i = bytes - 1; i >= 0; i--)
284 avio_w8(pb, (uint8_t)(val >> i * 8));
287 static void put_ebml_float(AVIOContext *pb, uint32_t elementid, double val)
289 put_ebml_id(pb, elementid);
290 put_ebml_length(pb, 8, 0);
291 avio_wb64(pb, av_double2int(val));
294 static void put_ebml_binary(AVIOContext *pb, uint32_t elementid,
295 const void *buf, int size)
297 put_ebml_id(pb, elementid);
298 put_ebml_length(pb, size, 0);
299 avio_write(pb, buf, size);
302 static void put_ebml_string(AVIOContext *pb, uint32_t elementid,
305 put_ebml_binary(pb, elementid, str, strlen(str));
309 * Write a void element of a given size. Useful for reserving space in
310 * the file to be written to later.
312 * @param size The number of bytes to reserve, which must be at least 2.
314 static void put_ebml_void(AVIOContext *pb, int size)
316 av_assert0(size >= 2);
318 put_ebml_id(pb, EBML_ID_VOID);
319 // we need to subtract the length needed to store the size from the
320 // size we need to reserve so 2 cases, we use 8 bytes to store the
321 // size if possible, 1 byte otherwise
324 put_ebml_length(pb, size, 0);
327 put_ebml_length(pb, size, 8);
329 ffio_fill(pb, 0, size);
332 static ebml_master start_ebml_master(AVIOContext *pb, uint32_t elementid,
333 uint64_t expectedsize)
335 int bytes = expectedsize ? ebml_length_size(expectedsize) : 8;
337 put_ebml_id(pb, elementid);
338 put_ebml_size_unknown(pb, bytes);
339 return (ebml_master) { avio_tell(pb), bytes };
342 static void end_ebml_master(AVIOContext *pb, ebml_master master)
344 int64_t pos = avio_tell(pb);
346 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
348 put_ebml_length(pb, pos - master.pos, master.sizebytes);
349 avio_seek(pb, pos, SEEK_SET);
352 static int start_ebml_master_crc32(AVIOContext **dyn_cp, MatroskaMuxContext *mkv)
356 if (!*dyn_cp && (ret = avio_open_dyn_buf(dyn_cp)) < 0)
360 put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
365 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp,
366 MatroskaMuxContext *mkv, uint32_t id,
367 int length_size, int keep_buffer)
369 uint8_t *buf, crc[4];
373 size = avio_get_dyn_buf(*dyn_cp, &buf);
374 put_ebml_length(pb, size, length_size);
375 if (mkv->write_crc) {
376 skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
377 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
378 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
380 avio_write(pb, buf + skip, size - skip);
383 ffio_reset_dyn_buf(*dyn_cp);
385 ffio_free_dyn_buf(dyn_cp);
390 * Complete ebml master without destroying the buffer, allowing for later updates
392 static void end_ebml_master_crc32_preliminary(AVIOContext *pb, AVIOContext *dyn_cp,
393 uint32_t id, int64_t *pos)
396 int size = avio_get_dyn_buf(dyn_cp, &buf);
398 *pos = avio_tell(pb);
401 put_ebml_length(pb, size, 0);
402 avio_write(pb, buf, size);
405 static void put_xiph_size(AVIOContext *pb, int size)
407 ffio_fill(pb, 255, size / 255);
408 avio_w8(pb, size % 255);
412 * Free the members allocated in the mux context.
414 static void mkv_deinit(AVFormatContext *s)
416 MatroskaMuxContext *mkv = s->priv_data;
418 av_packet_unref(&mkv->cur_audio_pkt);
420 ffio_free_dyn_buf(&mkv->cluster_bc);
421 ffio_free_dyn_buf(&mkv->info_bc);
422 ffio_free_dyn_buf(&mkv->tracks_bc);
423 ffio_free_dyn_buf(&mkv->tags_bc);
425 av_freep(&mkv->cues.entries);
426 av_freep(&mkv->tracks);
430 * Initialize the SeekHead element to be ready to index level 1 Matroska
431 * elements. Enough space to write MAX_SEEKHEAD_ENTRIES SeekHead entries
432 * will be reserved at the current file location.
434 static void mkv_start_seekhead(MatroskaMuxContext *mkv, AVIOContext *pb)
436 mkv->seekhead.filepos = avio_tell(pb);
437 // 21 bytes max for a Seek entry, 6 bytes max for the SeekHead ID
438 // and size, 6 bytes for a CRC32 element, and 2 bytes to guarantee
439 // that an EBML void element will fit afterwards
440 mkv->seekhead.reserved_size = MAX_SEEKHEAD_ENTRIES * MAX_SEEKENTRY_SIZE + 14;
441 put_ebml_void(pb, mkv->seekhead.reserved_size);
444 static void mkv_add_seekhead_entry(MatroskaMuxContext *mkv, uint32_t elementid,
447 mkv_seekhead *seekhead = &mkv->seekhead;
449 av_assert1(seekhead->num_entries < MAX_SEEKHEAD_ENTRIES);
451 seekhead->entries[seekhead->num_entries].elementid = elementid;
452 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - mkv->segment_offset;
456 * Write the SeekHead to the file at the location reserved for it
457 * and seek to destpos afterwards. When error_on_seek_failure
458 * is not set, failure to seek to the position designated for the
459 * SeekHead is not considered an error and it is presumed that
460 * destpos is the current position; failure to seek to destpos
461 * afterwards is always an error.
463 * @return 0 on success, < 0 on error.
465 static int mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv,
466 int error_on_seek_failure, int64_t destpos)
468 AVIOContext *dyn_cp = NULL;
469 mkv_seekhead *seekhead = &mkv->seekhead;
470 int64_t remaining, ret64;
473 if ((ret64 = avio_seek(pb, seekhead->filepos, SEEK_SET)) < 0)
474 return error_on_seek_failure ? ret64 : 0;
476 ret = start_ebml_master_crc32(&dyn_cp, mkv);
480 for (i = 0; i < seekhead->num_entries; i++) {
481 mkv_seekhead_entry *entry = &seekhead->entries[i];
482 ebml_master seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY,
485 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
486 put_ebml_length(dyn_cp, ebml_id_size(entry->elementid), 0);
487 put_ebml_id(dyn_cp, entry->elementid);
489 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
490 end_ebml_master(dyn_cp, seekentry);
492 end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_SEEKHEAD, 0, 0);
494 remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
495 put_ebml_void(pb, remaining);
497 if ((ret64 = avio_seek(pb, destpos, SEEK_SET)) < 0)
503 static int mkv_add_cuepoint(MatroskaMuxContext *mkv, int stream, int64_t ts,
504 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
506 mkv_cues *cues = &mkv->cues;
507 mkv_cuepoint *entries = cues->entries;
512 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
514 return AVERROR(ENOMEM);
515 cues->entries = entries;
517 cues->entries[cues->num_entries].pts = ts;
518 cues->entries[cues->num_entries].stream_idx = stream;
519 cues->entries[cues->num_entries].cluster_pos = cluster_pos - mkv->segment_offset;
520 cues->entries[cues->num_entries].relative_pos = relative_pos;
521 cues->entries[cues->num_entries++].duration = duration;
526 static int mkv_assemble_cues(AVStream **streams, AVIOContext *dyn_cp,
527 mkv_cues *cues, mkv_track *tracks, int num_tracks)
529 AVIOContext *cuepoint;
532 ret = avio_open_dyn_buf(&cuepoint);
536 for (mkv_cuepoint *entry = cues->entries, *end = entry + cues->num_entries;
538 uint64_t pts = entry->pts;
542 put_ebml_uint(cuepoint, MATROSKA_ID_CUETIME, pts);
544 // put all the entries from different tracks that have the exact same
545 // timestamp into the same CuePoint
546 for (int j = 0; j < num_tracks; j++)
547 tracks[j].has_cue = 0;
549 ebml_master track_positions;
550 int idx = entry->stream_idx;
552 av_assert0(idx >= 0 && idx < num_tracks);
553 if (tracks[idx].has_cue && streams[idx]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
555 tracks[idx].has_cue = 1;
556 track_positions = start_ebml_master(cuepoint, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
557 put_ebml_uint(cuepoint, MATROSKA_ID_CUETRACK , tracks[idx].track_num);
558 put_ebml_uint(cuepoint, MATROSKA_ID_CUECLUSTERPOSITION , entry->cluster_pos);
559 put_ebml_uint(cuepoint, MATROSKA_ID_CUERELATIVEPOSITION, entry->relative_pos);
560 if (entry->duration != -1)
561 put_ebml_uint(cuepoint, MATROSKA_ID_CUEDURATION , entry->duration);
562 end_ebml_master(cuepoint, track_positions);
563 } while (++entry < end && entry->pts == pts);
564 size = avio_get_dyn_buf(cuepoint, &buf);
565 put_ebml_binary(dyn_cp, MATROSKA_ID_POINTENTRY, buf, size);
566 ffio_reset_dyn_buf(cuepoint);
568 ffio_free_dyn_buf(&cuepoint);
573 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb,
574 const AVCodecParameters *par)
576 const uint8_t *header_start[3];
578 int first_header_size;
581 if (par->codec_id == AV_CODEC_ID_VORBIS)
582 first_header_size = 30;
584 first_header_size = 42;
586 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
587 first_header_size, header_start, header_len) < 0) {
588 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
592 avio_w8(pb, 2); // number packets - 1
593 for (j = 0; j < 2; j++) {
594 put_xiph_size(pb, header_len[j]);
596 for (j = 0; j < 3; j++)
597 avio_write(pb, header_start[j], header_len[j]);
602 static int put_wv_codecpriv(AVIOContext *pb, const AVCodecParameters *par)
604 if (par->extradata && par->extradata_size == 2)
605 avio_write(pb, par->extradata, 2);
607 avio_wl16(pb, 0x410); // fallback to the most recent version
611 static int put_flac_codecpriv(AVFormatContext *s, AVIOContext *pb,
612 const AVCodecParameters *par)
614 int write_comment = (par->channel_layout &&
615 !(par->channel_layout & ~0x3ffffULL) &&
616 !ff_flac_is_native_layout(par->channel_layout));
617 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
624 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
625 "Lavf" : LIBAVFORMAT_IDENT;
626 AVDictionary *dict = NULL;
627 uint8_t buf[32], *data, *p;
630 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
631 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
633 len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
634 av_assert1(len < (1 << 24) - 4);
636 data = av_malloc(len + 4);
639 return AVERROR(ENOMEM);
643 AV_WB24(data + 1, len);
646 ff_vorbiscomment_write(&p, &dict, vendor, NULL, 0);
648 avio_write(pb, data, len + 4);
657 static int get_aac_sample_rates(AVFormatContext *s, const uint8_t *extradata,
658 int extradata_size, int *sample_rate,
659 int *output_sample_rate)
661 MPEG4AudioConfig mp4ac;
664 ret = avpriv_mpeg4audio_get_config2(&mp4ac, extradata, extradata_size, 1, s);
665 /* Don't abort if the failure is because of missing extradata. Assume in that
666 * case a bitstream filter will provide the muxer with the extradata in the
668 * Abort however if s->pb is not seekable, as we would not be able to seek back
669 * to write the sample rate elements once the extradata shows up, anyway. */
670 if (ret < 0 && (extradata_size || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL))) {
671 av_log(s, AV_LOG_ERROR,
672 "Error parsing AAC extradata, unable to determine samplerate.\n");
673 return AVERROR(EINVAL);
677 /* This will only happen when this function is called while writing the
678 * header and no extradata is available. The space for this element has
679 * to be reserved for when this function is called again after the
680 * extradata shows up in the first packet, as there's no way to know if
681 * output_sample_rate will be different than sample_rate or not. */
682 *output_sample_rate = *sample_rate;
684 *sample_rate = mp4ac.sample_rate;
685 *output_sample_rate = mp4ac.ext_sample_rate;
690 static int mkv_write_native_codecprivate(AVFormatContext *s, AVIOContext *pb,
691 const AVCodecParameters *par,
694 switch (par->codec_id) {
695 case AV_CODEC_ID_VORBIS:
696 case AV_CODEC_ID_THEORA:
697 return put_xiph_codecpriv(s, dyn_cp, par);
698 case AV_CODEC_ID_FLAC:
699 return put_flac_codecpriv(s, dyn_cp, par);
700 case AV_CODEC_ID_WAVPACK:
701 return put_wv_codecpriv(dyn_cp, par);
702 case AV_CODEC_ID_H264:
703 return ff_isom_write_avcc(dyn_cp, par->extradata,
704 par->extradata_size);
705 case AV_CODEC_ID_HEVC:
706 return ff_isom_write_hvcc(dyn_cp, par->extradata,
707 par->extradata_size, 0);
708 case AV_CODEC_ID_AV1:
709 if (par->extradata_size)
710 return ff_isom_write_av1c(dyn_cp, par->extradata,
711 par->extradata_size);
713 put_ebml_void(pb, 4 + 3);
715 case AV_CODEC_ID_ALAC:
716 if (par->extradata_size < 36) {
717 av_log(s, AV_LOG_ERROR,
718 "Invalid extradata found, ALAC expects a 36-byte "
720 return AVERROR_INVALIDDATA;
722 avio_write(dyn_cp, par->extradata + 12,
723 par->extradata_size - 12);
725 case AV_CODEC_ID_AAC:
726 if (par->extradata_size)
727 avio_write(dyn_cp, par->extradata, par->extradata_size);
729 put_ebml_void(pb, MAX_PCE_SIZE + 2 + 4);
732 if (par->codec_id == AV_CODEC_ID_PRORES &&
733 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
734 avio_wl32(dyn_cp, par->codec_tag);
735 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
736 avio_write(dyn_cp, par->extradata, par->extradata_size);
742 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
743 AVCodecParameters *par,
744 int native_id, int qt_id)
748 int ret, codecpriv_size;
750 ret = avio_open_dyn_buf(&dyn_cp);
755 ret = mkv_write_native_codecprivate(s, pb, par, dyn_cp);
756 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
759 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
761 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
762 && (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
765 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
766 avio_wl32(dyn_cp, par->codec_tag);
767 for(i = 0; i < 0x5a - 8; i++)
770 avio_write(dyn_cp, par->extradata, par->extradata_size);
772 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
773 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
774 avcodec_get_name(par->codec_id));
777 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
779 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
780 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
781 avcodec_get_name(par->codec_id));
782 ret = AVERROR(EINVAL);
785 ff_put_bmp_header(dyn_cp, par, 0, 0);
787 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
789 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
791 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
792 avcodec_get_name(par->codec_id));
793 ret = AVERROR(EINVAL);
796 par->codec_tag = tag;
798 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
801 codecpriv_size = avio_get_dyn_buf(dyn_cp, &codecpriv);
803 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
805 ffio_free_dyn_buf(&dyn_cp);
809 static int mkv_write_video_color(AVIOContext *pb, const AVCodecParameters *par,
813 uint8_t *colorinfo_ptr;
814 int side_data_size = 0;
815 int ret, colorinfo_size;
816 const uint8_t *side_data;
818 ret = avio_open_dyn_buf(&dyn_cp);
822 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
823 par->color_trc < AVCOL_TRC_NB) {
824 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
827 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
828 par->color_space < AVCOL_SPC_NB) {
829 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
831 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
832 par->color_primaries < AVCOL_PRI_NB) {
833 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
835 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
836 par->color_range < AVCOL_RANGE_NB) {
837 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
839 if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
840 par->chroma_location <= AVCHROMA_LOC_TOP) {
843 avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
844 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
845 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
848 side_data = av_stream_get_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
850 if (side_data_size) {
851 const AVContentLightMetadata *metadata =
852 (const AVContentLightMetadata*)side_data;
853 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXCLL, metadata->MaxCLL);
854 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXFALL, metadata->MaxFALL);
857 side_data = av_stream_get_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
859 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
860 ebml_master meta_element = start_ebml_master(
861 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 10 * (2 + 1 + 8));
862 const AVMasteringDisplayMetadata *metadata =
863 (const AVMasteringDisplayMetadata*)side_data;
864 if (metadata->has_primaries) {
865 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
866 av_q2d(metadata->display_primaries[0][0]));
867 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
868 av_q2d(metadata->display_primaries[0][1]));
869 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
870 av_q2d(metadata->display_primaries[1][0]));
871 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
872 av_q2d(metadata->display_primaries[1][1]));
873 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
874 av_q2d(metadata->display_primaries[2][0]));
875 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
876 av_q2d(metadata->display_primaries[2][1]));
877 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
878 av_q2d(metadata->white_point[0]));
879 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
880 av_q2d(metadata->white_point[1]));
882 if (metadata->has_luminance) {
883 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
884 av_q2d(metadata->max_luminance));
885 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
886 av_q2d(metadata->min_luminance));
888 end_ebml_master(dyn_cp, meta_element);
891 colorinfo_size = avio_get_dyn_buf(dyn_cp, &colorinfo_ptr);
892 if (colorinfo_size) {
893 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, colorinfo_size);
894 avio_write(pb, colorinfo_ptr, colorinfo_size);
895 end_ebml_master(pb, colorinfo);
897 ffio_free_dyn_buf(&dyn_cp);
901 static int mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
904 ebml_master projection;
905 int side_data_size = 0;
908 const AVSphericalMapping *spherical =
909 (const AVSphericalMapping *)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
915 if (spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR &&
916 spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR_TILE &&
917 spherical->projection != AV_SPHERICAL_CUBEMAP) {
918 av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
922 // Maximally 4 8-byte elements with id-length 2 + 1 byte length field
923 // and the private data of the AV_SPHERICAL_EQUIRECTANGULAR_TILE case
924 projection = start_ebml_master(pb, MATROSKA_ID_VIDEOPROJECTION,
925 4 * (2 + 1 + 8) + (2 + 1 + 20));
927 switch (spherical->projection) {
928 case AV_SPHERICAL_EQUIRECTANGULAR:
929 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
930 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
932 case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
933 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
934 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
935 AV_WB32(private, 0); // version + flags
936 AV_WB32(private + 4, spherical->bound_top);
937 AV_WB32(private + 8, spherical->bound_bottom);
938 AV_WB32(private + 12, spherical->bound_left);
939 AV_WB32(private + 16, spherical->bound_right);
940 put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
943 case AV_SPHERICAL_CUBEMAP:
944 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
945 MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
946 AV_WB32(private, 0); // version + flags
947 AV_WB32(private + 4, 0); // layout
948 AV_WB32(private + 8, spherical->padding);
949 put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
957 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW,
958 (double) spherical->yaw / (1 << 16));
959 if (spherical->pitch)
960 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH,
961 (double) spherical->pitch / (1 << 16));
963 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL,
964 (double) spherical->roll / (1 << 16));
966 end_ebml_master(pb, projection);
971 static void mkv_write_field_order(AVIOContext *pb, int mode,
972 enum AVFieldOrder field_order)
974 switch (field_order) {
975 case AV_FIELD_UNKNOWN:
977 case AV_FIELD_PROGRESSIVE:
978 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
979 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
985 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
986 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
987 if (mode != MODE_WEBM) {
988 switch (field_order) {
990 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
991 MATROSKA_VIDEO_FIELDORDER_TT);
994 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
995 MATROSKA_VIDEO_FIELDORDER_BB);
998 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
999 MATROSKA_VIDEO_FIELDORDER_TB);
1002 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1003 MATROSKA_VIDEO_FIELDORDER_BT);
1010 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
1011 AVStream *st, int mode, int *h_width, int *h_height)
1015 const AVDictionaryEntry *tag;
1016 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1020 // convert metadata into proper side data and add it to the stream
1021 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
1022 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
1023 int stereo_mode = atoi(tag->value);
1025 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
1026 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
1031 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1032 stereo_mode != 10 && stereo_mode != 12) {
1033 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
1039 // iterate to find the stereo3d side data
1040 for (i = 0; i < st->nb_side_data; i++) {
1041 AVPacketSideData sd = st->side_data[i];
1042 if (sd.type == AV_PKT_DATA_STEREO3D) {
1043 AVStereo3D *stereo = (AVStereo3D *)sd.data;
1045 switch (stereo->type) {
1046 case AV_STEREO3D_2D:
1047 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
1049 case AV_STEREO3D_SIDEBYSIDE:
1050 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1051 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
1052 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
1055 case AV_STEREO3D_TOPBOTTOM:
1056 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
1057 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1061 case AV_STEREO3D_CHECKERBOARD:
1062 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
1063 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1066 case AV_STEREO3D_LINES:
1067 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
1068 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1072 case AV_STEREO3D_COLUMNS:
1073 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
1074 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1078 case AV_STEREO3D_FRAMESEQUENCE:
1079 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
1080 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1088 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1091 // if webm, do not write unsupported modes
1092 if ((mode == MODE_WEBM &&
1093 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
1094 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
1095 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
1096 av_log(s, AV_LOG_ERROR,
1097 "The specified stereo mode is not valid.\n");
1098 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1099 return AVERROR(EINVAL);
1102 // write StereoMode if format is valid
1103 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1108 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1109 AVStream *st, mkv_track *track, AVIOContext *pb,
1112 AVCodecParameters *par = st->codecpar;
1113 ebml_master subinfo, track_master;
1117 int sample_rate = par->sample_rate;
1118 int output_sample_rate = 0;
1119 int display_width_div = 1;
1120 int display_height_div = 1;
1122 const AVDictionaryEntry *tag;
1124 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1127 if (par->codec_id == AV_CODEC_ID_AAC) {
1128 ret = get_aac_sample_rates(s, par->extradata, par->extradata_size, &sample_rate,
1129 &output_sample_rate);
1134 track_master = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1135 put_ebml_uint(pb, MATROSKA_ID_TRACKNUMBER, track->track_num);
1136 put_ebml_uid (pb, MATROSKA_ID_TRACKUID, track->uid);
1137 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGLACING, 0); // no lacing (yet)
1139 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1140 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1141 tag = av_dict_get(st->metadata, "language", NULL, 0);
1142 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE,
1143 tag && tag->value ? tag->value : "und");
1145 // The default value for TRACKFLAGDEFAULT is 1, so add element
1146 // if we need to clear it.
1148 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, 0);
1150 if (st->disposition & AV_DISPOSITION_FORCED)
1151 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1153 if (mkv->mode == MODE_WEBM) {
1154 const char *codec_id;
1155 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1156 for (j = 0; ff_webm_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1157 if (ff_webm_codec_tags[j].id == par->codec_id) {
1158 codec_id = ff_webm_codec_tags[j].str;
1163 } else if (par->codec_id == AV_CODEC_ID_WEBVTT) {
1164 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1165 codec_id = "D_WEBVTT/CAPTIONS";
1166 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1167 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1168 codec_id = "D_WEBVTT/DESCRIPTIONS";
1169 native_id = MATROSKA_TRACK_TYPE_METADATA;
1170 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1171 codec_id = "D_WEBVTT/METADATA";
1172 native_id = MATROSKA_TRACK_TYPE_METADATA;
1174 codec_id = "D_WEBVTT/SUBTITLES";
1175 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1180 av_log(s, AV_LOG_ERROR,
1181 "Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1182 return AVERROR(EINVAL);
1185 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1187 // look for a codec ID string specific to mkv to use,
1188 // if none are found, use AVI codes
1189 if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
1190 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1191 if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
1192 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1198 if (mkv->allow_raw_vfw) {
1201 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1202 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1203 return AVERROR(EINVAL);
1208 switch (par->codec_type) {
1209 case AVMEDIA_TYPE_VIDEO:
1210 mkv->have_video = 1;
1211 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1213 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1214 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1215 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1216 else if( st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0
1217 && av_cmp_q(av_inv_q(st->r_frame_rate), st->time_base) > 0)
1218 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->r_frame_rate.den / st->r_frame_rate.num);
1221 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1222 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1223 par->codec_id == AV_CODEC_ID_SVQ1 ||
1224 par->codec_id == AV_CODEC_ID_SVQ3 ||
1225 par->codec_id == AV_CODEC_ID_CINEPAK))
1229 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1230 else if (!native_id) {
1231 // if there is no mkv-specific codec ID, use VFW mode
1232 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1233 track->write_dts = 1;
1234 s->internal->avoid_negative_ts_use_pts = 0;
1237 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1239 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1240 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1242 mkv_write_field_order(pb, mkv->mode, par->field_order);
1244 // check both side data and metadata for stereo information,
1245 // write the result to the bitstream if any is found
1246 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1248 &display_height_div);
1252 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1253 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1254 (par->format == AV_PIX_FMT_YUVA420P)) {
1255 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1258 // write DisplayWidth and DisplayHeight, they contain the size of
1259 // a single source view and/or the display aspect ratio
1260 if (st->sample_aspect_ratio.num) {
1261 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1262 if (d_width > INT_MAX) {
1263 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1264 return AVERROR(EINVAL);
1266 if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
1267 if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
1268 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1269 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1271 AVRational display_aspect_ratio;
1272 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
1273 par->width * (int64_t)st->sample_aspect_ratio.num,
1274 par->height * (int64_t)st->sample_aspect_ratio.den,
1276 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
1277 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
1278 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
1281 } else if (display_width_div != 1 || display_height_div != 1) {
1282 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1283 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1284 } else if (mkv->mode != MODE_WEBM)
1285 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1287 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1288 uint32_t color_space = av_le2ne32(par->codec_tag);
1289 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1291 ret = mkv_write_video_color(pb, par, st);
1294 ret = mkv_write_video_projection(s, pb, st);
1297 end_ebml_master(pb, subinfo);
1300 case AVMEDIA_TYPE_AUDIO:
1301 if (par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1302 int64_t codecdelay = av_rescale_q(par->initial_padding,
1303 (AVRational){ 1, 48000 },
1304 (AVRational){ 1, 1000000000 });
1305 if (codecdelay < 0) {
1306 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1307 return AVERROR(EINVAL);
1309 // track->ts_offset = av_rescale_q(par->initial_padding,
1310 // (AVRational){ 1, par->sample_rate },
1313 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1315 if (par->codec_id == AV_CODEC_ID_OPUS)
1316 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1318 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1321 // no mkv-specific ID, use ACM mode
1322 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1324 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 6 + 4 * 9);
1325 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1327 track->sample_rate_offset = avio_tell(pb);
1328 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1329 if (output_sample_rate)
1330 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1332 bit_depth = av_get_bits_per_sample(par->codec_id);
1333 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1334 if (par->bits_per_raw_sample)
1335 bit_depth = par->bits_per_raw_sample;
1337 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1340 bit_depth = par->bits_per_coded_sample;
1342 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1343 end_ebml_master(pb, subinfo);
1346 case AVMEDIA_TYPE_SUBTITLE:
1348 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1349 return AVERROR(ENOSYS);
1352 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1353 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1355 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1358 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1359 return AVERROR(EINVAL);
1362 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1363 track->codecpriv_offset = avio_tell(pb);
1364 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1369 end_ebml_master(pb, track_master);
1374 static int mkv_write_tracks(AVFormatContext *s)
1376 MatroskaMuxContext *mkv = s->priv_data;
1377 AVIOContext *pb = s->pb;
1378 int i, ret, video_default_idx, audio_default_idx, subtitle_default_idx;
1380 if (mkv->nb_attachments == s->nb_streams)
1383 mkv_add_seekhead_entry(mkv, MATROSKA_ID_TRACKS, avio_tell(pb));
1385 ret = start_ebml_master_crc32(&mkv->tracks_bc, mkv);
1389 if (mkv->default_mode != DEFAULT_MODE_PASSTHROUGH) {
1390 int video_idx, audio_idx, subtitle_idx;
1392 video_idx = video_default_idx =
1393 audio_idx = audio_default_idx =
1394 subtitle_idx = subtitle_default_idx = -1;
1396 for (i = s->nb_streams - 1; i >= 0; i--) {
1397 AVStream *st = s->streams[i];
1399 switch (st->codecpar->codec_type) {
1400 #define CASE(type, variable) \
1401 case AVMEDIA_TYPE_ ## type: \
1402 variable ## _idx = i; \
1403 if (st->disposition & AV_DISPOSITION_DEFAULT) \
1404 variable ## _default_idx = i; \
1408 CASE(SUBTITLE, subtitle)
1413 video_default_idx = FFMAX(video_default_idx, video_idx);
1414 audio_default_idx = FFMAX(audio_default_idx, audio_idx);
1415 if (mkv->default_mode != DEFAULT_MODE_INFER_NO_SUBS)
1416 subtitle_default_idx = FFMAX(subtitle_default_idx, subtitle_idx);
1418 for (i = 0; i < s->nb_streams; i++) {
1419 AVStream *st = s->streams[i];
1420 int is_default = mkv->default_mode == DEFAULT_MODE_PASSTHROUGH ?
1421 st->disposition & AV_DISPOSITION_DEFAULT :
1422 i == video_default_idx || i == audio_default_idx ||
1423 i == subtitle_default_idx;
1424 ret = mkv_write_track(s, mkv, st, &mkv->tracks[i],
1425 mkv->tracks_bc, is_default);
1430 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1431 end_ebml_master_crc32_preliminary(pb, mkv->tracks_bc,
1432 MATROSKA_ID_TRACKS, &mkv->tracks_pos);
1434 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, MATROSKA_ID_TRACKS, 0, 0);
1439 static int mkv_write_chapters(AVFormatContext *s)
1441 MatroskaMuxContext *mkv = s->priv_data;
1442 AVIOContext *dyn_cp = NULL, *pb = s->pb;
1443 ebml_master editionentry;
1444 AVRational scale = {1, 1E9};
1447 if (!s->nb_chapters || mkv->wrote_chapters)
1450 mkv_add_seekhead_entry(mkv, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1452 ret = start_ebml_master_crc32(&dyn_cp, mkv);
1456 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1457 if (mkv->mode != MODE_WEBM)
1458 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1460 for (i = 0; i < s->nb_chapters; i++) {
1461 ebml_master chapteratom, chapterdisplay;
1462 const AVChapter *c = s->chapters[i];
1463 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1464 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1465 const AVDictionaryEntry *t;
1466 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1467 av_log(s, AV_LOG_ERROR,
1468 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1469 chapterstart, chapterend);
1470 return AVERROR_INVALIDDATA;
1473 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1474 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID,
1475 (uint32_t)c->id + (uint64_t)mkv->chapter_id_offset);
1476 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1477 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1478 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1479 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1480 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1481 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1482 end_ebml_master(dyn_cp, chapterdisplay);
1484 end_ebml_master(dyn_cp, chapteratom);
1486 end_ebml_master(dyn_cp, editionentry);
1487 end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CHAPTERS, 0, 0);
1489 mkv->wrote_chapters = 1;
1493 static int mkv_write_simpletag(AVIOContext *pb, const AVDictionaryEntry *t)
1495 uint8_t *key = av_strdup(t->key);
1497 const uint8_t *lang = NULL;
1501 return AVERROR(ENOMEM);
1503 if ((p = strrchr(p, '-')) &&
1504 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1511 else if (*p >= 'a' && *p <= 'z')
1516 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1517 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1519 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1520 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1521 end_ebml_master(pb, tag);
1527 static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
1528 uint64_t uid, ebml_master *tag)
1531 MatroskaMuxContext *mkv = s->priv_data;
1532 ebml_master targets;
1535 if (!mkv->tags_bc) {
1536 mkv_add_seekhead_entry(mkv, MATROSKA_ID_TAGS, avio_tell(s->pb));
1538 ret = start_ebml_master_crc32(&mkv->tags_bc, mkv);
1544 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1545 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 4 + 1 + 8);
1547 put_ebml_uid(pb, elementid, uid);
1548 end_ebml_master(pb, targets);
1552 static int mkv_check_tag_name(const char *name, uint32_t elementid)
1554 return av_strcasecmp(name, "title") &&
1555 av_strcasecmp(name, "stereo_mode") &&
1556 av_strcasecmp(name, "creation_time") &&
1557 av_strcasecmp(name, "encoding_tool") &&
1558 av_strcasecmp(name, "duration") &&
1559 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1560 av_strcasecmp(name, "language")) &&
1561 (elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1562 (av_strcasecmp(name, "filename") &&
1563 av_strcasecmp(name, "mimetype")));
1566 static int mkv_write_tag(AVFormatContext *s, const AVDictionary *m,
1567 uint32_t elementid, uint64_t uid, ebml_master *tag)
1569 MatroskaMuxContext *mkv = s->priv_data;
1570 const AVDictionaryEntry *t = NULL;
1574 ret = mkv_write_tag_targets(s, elementid, uid, tag ? tag : &tag2);
1578 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1579 if (mkv_check_tag_name(t->key, elementid)) {
1580 ret = mkv_write_simpletag(mkv->tags_bc, t);
1587 end_ebml_master(mkv->tags_bc, tag2);
1592 static int mkv_check_tag(const AVDictionary *m, uint32_t elementid)
1594 const AVDictionaryEntry *t = NULL;
1596 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1597 if (mkv_check_tag_name(t->key, elementid))
1603 static int mkv_write_tags(AVFormatContext *s)
1605 MatroskaMuxContext *mkv = s->priv_data;
1606 ebml_master tag, *tagp;
1609 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1611 if (mkv_check_tag(s->metadata, 0)) {
1612 ret = mkv_write_tag(s, s->metadata, 0, 0, NULL);
1617 tagp = (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live ? &tag : NULL;
1618 for (i = 0; i < s->nb_streams; i++) {
1619 const AVStream *st = s->streams[i];
1620 mkv_track *track = &mkv->tracks[i];
1622 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1625 if (!tagp && !mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1628 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID,
1634 AVIOContext *pb = mkv->tags_bc;
1635 ebml_master simpletag;
1637 simpletag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG,
1639 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1640 track->duration_offset = avio_tell(pb);
1642 // Reserve space to write duration as a 20-byte string.
1643 // 2 (ebml id) + 1 (data size) + 20 (data)
1644 put_ebml_void(pb, 23);
1645 end_ebml_master(pb, simpletag);
1646 end_ebml_master(pb, tag);
1650 if (mkv->mode != MODE_WEBM) {
1651 for (i = 0; i < s->nb_chapters; i++) {
1652 AVChapter *ch = s->chapters[i];
1654 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1657 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID,
1658 (uint32_t)ch->id + (uint64_t)mkv->chapter_id_offset,
1665 if (mkv->nb_attachments && mkv->mode != MODE_WEBM) {
1666 for (i = 0; i < s->nb_streams; i++) {
1667 const mkv_track *track = &mkv->tracks[i];
1668 const AVStream *st = s->streams[i];
1670 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1673 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1676 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID,
1684 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1685 end_ebml_master_crc32_preliminary(s->pb, mkv->tags_bc,
1686 MATROSKA_ID_TAGS, &mkv->tags_pos);
1688 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS, 0, 0);
1693 static int mkv_write_attachments(AVFormatContext *s)
1695 MatroskaMuxContext *mkv = s->priv_data;
1696 AVIOContext *dyn_cp = NULL, *pb = s->pb;
1699 if (!mkv->nb_attachments)
1702 mkv_add_seekhead_entry(mkv, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1704 ret = start_ebml_master_crc32(&dyn_cp, mkv);
1708 for (i = 0; i < s->nb_streams; i++) {
1709 const AVStream *st = s->streams[i];
1710 mkv_track *track = &mkv->tracks[i];
1711 ebml_master attached_file;
1712 const AVDictionaryEntry *t;
1713 const char *mimetype = NULL;
1715 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1718 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1720 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1721 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1722 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1723 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1724 return AVERROR(EINVAL);
1726 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1727 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1728 mimetype = t->value;
1729 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1730 const AVCodecDescriptor *desc = avcodec_descriptor_get(st->codecpar->codec_id);
1731 if (desc && desc->mime_types) {
1732 mimetype = desc->mime_types[0];
1733 } else if (st->codecpar->codec_id == AV_CODEC_ID_TEXT)
1734 mimetype = "text/plain";
1737 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1738 "it cannot be deduced from the codec id.\n", i);
1739 return AVERROR(EINVAL);
1742 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1743 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1744 put_ebml_uid(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
1745 end_ebml_master(dyn_cp, attached_file);
1747 end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS, 0, 0);
1752 static int64_t get_metadata_duration(AVFormatContext *s)
1754 const AVDictionaryEntry *duration = av_dict_get(s->metadata, "DURATION",
1759 if (duration && (av_parse_time(&us, duration->value, 1) == 0) && us > 0) {
1760 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1764 for (unsigned i = 0; i < s->nb_streams; i++) {
1766 duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1768 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1769 max = FFMAX(max, us);
1772 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1776 static int mkv_write_header(AVFormatContext *s)
1778 MatroskaMuxContext *mkv = s->priv_data;
1779 AVIOContext *pb = s->pb;
1780 ebml_master ebml_header;
1781 const AVDictionaryEntry *tag;
1782 int ret, i, version = 2;
1783 int64_t creation_time;
1785 if (mkv->mode != MODE_WEBM ||
1786 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1787 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1790 for (i = 0; i < s->nb_streams; i++) {
1791 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1792 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1793 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1797 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, MAX_EBML_HEADER_SIZE);
1798 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1799 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1800 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1801 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1802 put_ebml_string(pb, EBML_ID_DOCTYPE , s->oformat->name);
1803 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1804 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION, 2);
1805 end_ebml_master(pb, ebml_header);
1807 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1808 mkv->segment_offset = avio_tell(pb);
1810 // we write a seek head at the beginning to point to all other level
1811 // one elements (except Clusters).
1812 mkv_start_seekhead(mkv, pb);
1814 mkv_add_seekhead_entry(mkv, MATROSKA_ID_INFO, avio_tell(pb));
1816 ret = start_ebml_master_crc32(&mkv->info_bc, mkv);
1821 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1822 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1823 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1824 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1825 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1826 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1827 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1829 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1831 if (mkv->mode != MODE_WEBM)
1832 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, mkv->segment_uid, 16);
1834 const char *ident = "Lavf";
1835 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1836 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1839 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1840 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1841 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1842 uint8_t date_utc_buf[8];
1843 AV_WB64(date_utc_buf, date_utc);
1844 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1847 // reserve space for the duration
1849 mkv->duration_offset = avio_tell(pb);
1850 if (!mkv->is_live) {
1851 int64_t metadata_duration = get_metadata_duration(s);
1853 if (s->duration > 0) {
1854 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1855 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1856 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1857 } else if (metadata_duration > 0) {
1858 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1859 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1860 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1862 put_ebml_void(pb, 11); // assumes double-precision float to be written
1865 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1866 end_ebml_master_crc32_preliminary(s->pb, mkv->info_bc,
1867 MATROSKA_ID_INFO, &mkv->info_pos);
1869 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, MATROSKA_ID_INFO, 0, 0);
1872 ret = mkv_write_tracks(s);
1876 for (i = 0; i < s->nb_chapters; i++)
1877 if (!s->chapters[i]->id) {
1878 mkv->chapter_id_offset = 1;
1882 ret = mkv_write_chapters(s);
1886 if (mkv->mode != MODE_WEBM) {
1887 ret = mkv_write_attachments(s);
1892 ret = mkv_write_tags(s);
1896 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) || mkv->is_live) {
1897 ret = mkv_write_seekhead(pb, mkv, 0, avio_tell(pb));
1902 if (s->metadata_header_padding > 0) {
1903 if (s->metadata_header_padding == 1)
1904 s->metadata_header_padding++;
1905 put_ebml_void(pb, s->metadata_header_padding);
1908 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && mkv->reserve_cues_space) {
1909 mkv->cues_pos = avio_tell(pb);
1910 if (mkv->reserve_cues_space == 1)
1911 mkv->reserve_cues_space++;
1912 put_ebml_void(pb, mkv->reserve_cues_space);
1915 av_init_packet(&mkv->cur_audio_pkt);
1916 mkv->cur_audio_pkt.size = 0;
1917 mkv->cluster_pos = -1;
1919 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1920 // after 4k and on a keyframe
1921 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
1922 if (mkv->cluster_time_limit < 0)
1923 mkv->cluster_time_limit = 5000;
1924 if (mkv->cluster_size_limit < 0)
1925 mkv->cluster_size_limit = 5 * 1024 * 1024;
1927 if (mkv->cluster_time_limit < 0)
1928 mkv->cluster_time_limit = 1000;
1929 if (mkv->cluster_size_limit < 0)
1930 mkv->cluster_size_limit = 32 * 1024;
1936 static int mkv_blockgroup_size(int pkt_size, int track_num_size)
1938 int size = pkt_size + track_num_size + 3;
1939 size += ebml_length_size(size);
1940 size += 2; // EBML ID for block and block duration
1941 size += 9; // max size of block duration incl. length field
1945 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1952 dst = av_malloc(srclen);
1954 return AVERROR(ENOMEM);
1956 while (srclen >= WV_HEADER_SIZE) {
1959 ret = ff_wv_parse_header(&header, src);
1962 src += WV_HEADER_SIZE;
1963 srclen -= WV_HEADER_SIZE;
1965 if (srclen < header.blocksize) {
1966 ret = AVERROR_INVALIDDATA;
1970 if (header.initial) {
1971 AV_WL32(dst + offset, header.samples);
1974 AV_WL32(dst + offset, header.flags);
1975 AV_WL32(dst + offset + 4, header.crc);
1978 if (!(header.initial && header.final)) {
1979 AV_WL32(dst + offset, header.blocksize);
1983 memcpy(dst + offset, src, header.blocksize);
1984 src += header.blocksize;
1985 srclen -= header.blocksize;
1986 offset += header.blocksize;
1998 static int mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1999 uint32_t blockid, const AVPacket *pkt, int keyframe)
2001 MatroskaMuxContext *mkv = s->priv_data;
2002 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2003 mkv_track *track = &mkv->tracks[pkt->stream_index];
2004 uint8_t *data = NULL, *side_data = NULL;
2005 int err = 0, offset = 0, size = pkt->size, side_data_size = 0;
2006 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2007 uint64_t additional_id;
2008 int64_t discard_padding = 0;
2009 unsigned track_number = track->track_num;
2010 ebml_master block_group, block_additions, block_more;
2012 ts += track->ts_offset;
2014 /* The following string is identical to the one in mkv_write_vtt_blocks
2015 * so that only one copy needs to exist in binaries. */
2016 av_log(s, AV_LOG_DEBUG,
2017 "Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
2018 "duration %" PRId64 " at relative offset %" PRId64 " in cluster "
2019 "at offset %" PRId64 ". TrackNumber %u, keyframe %d\n",
2020 pkt->size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
2021 mkv->cluster_pos, track_number, keyframe != 0);
2023 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
2024 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
2025 err = ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
2026 } else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
2027 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
2028 /* extradata is Annex B, assume the bitstream is too and convert it */
2029 err = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
2030 } else if (par->codec_id == AV_CODEC_ID_AV1) {
2031 err = ff_av1_filter_obus_buf(pkt->data, &data, &size, &offset);
2032 } else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
2033 err = mkv_strip_wavpack(pkt->data, &data, &size);
2038 av_log(s, AV_LOG_ERROR, "Error when reformatting data of "
2039 "a packet from stream %d.\n", pkt->stream_index);
2043 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
2044 /* Matroska specification requires to remove the first QuickTime atom
2050 side_data = av_packet_get_side_data(pkt,
2051 AV_PKT_DATA_SKIP_SAMPLES,
2053 if (side_data && side_data_size >= 10) {
2054 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
2055 (AVRational){1, par->sample_rate},
2056 (AVRational){1, 1000000000});
2059 side_data = av_packet_get_side_data(pkt,
2060 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2063 // Only the Codec-specific BlockMore (id == 1) is currently supported.
2064 if (side_data_size < 8 || (additional_id = AV_RB64(side_data)) != 1) {
2068 side_data_size -= 8;
2072 if (side_data_size || discard_padding) {
2073 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
2074 blockid = MATROSKA_ID_BLOCK;
2077 put_ebml_id(pb, blockid);
2078 put_ebml_length(pb, size + track->track_num_size + 3, 0);
2079 put_ebml_num(pb, track_number, track->track_num_size);
2080 avio_wb16(pb, ts - mkv->cluster_pts);
2081 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
2082 avio_write(pb, data + offset, size);
2083 if (data != pkt->data)
2086 if (blockid == MATROSKA_ID_BLOCK && !keyframe)
2087 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE, track->last_timestamp - ts);
2088 track->last_timestamp = ts;
2090 if (discard_padding)
2091 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
2093 if (side_data_size) {
2094 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2095 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2096 /* Until dbc50f8a our demuxer used a wrong default value
2097 * of BlockAddID, so we write it unconditionally. */
2098 put_ebml_uint (pb, MATROSKA_ID_BLOCKADDID, additional_id);
2099 put_ebml_binary(pb, MATROSKA_ID_BLOCKADDITIONAL,
2100 side_data, side_data_size);
2101 end_ebml_master(pb, block_more);
2102 end_ebml_master(pb, block_additions);
2104 if (side_data_size || discard_padding)
2105 end_ebml_master(pb, block_group);
2110 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, const AVPacket *pkt)
2112 MatroskaMuxContext *mkv = s->priv_data;
2113 mkv_track *track = &mkv->tracks[pkt->stream_index];
2114 ebml_master blockgroup;
2115 int id_size, settings_size, size;
2116 uint8_t *id, *settings;
2117 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2118 const int flags = 0;
2121 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2125 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2128 size = id_size + 1 + settings_size + 1 + pkt->size;
2130 /* The following string is identical to the one in mkv_write_block so that
2131 * only one copy needs to exist in binaries. */
2132 av_log(s, AV_LOG_DEBUG,
2133 "Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
2134 "duration %" PRId64 " at relative offset %" PRId64 " in cluster "
2135 "at offset %" PRId64 ". TrackNumber %u, keyframe %d\n",
2136 size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
2137 mkv->cluster_pos, track->track_num, 1);
2139 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2140 mkv_blockgroup_size(size, track->track_num_size));
2142 put_ebml_id(pb, MATROSKA_ID_BLOCK);
2143 put_ebml_length(pb, size + track->track_num_size + 3, 0);
2144 put_ebml_num(pb, track->track_num, track->track_num_size);
2145 avio_wb16(pb, ts - mkv->cluster_pts);
2147 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2149 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2150 end_ebml_master(pb, blockgroup);
2152 return pkt->duration;
2155 static void mkv_end_cluster(AVFormatContext *s)
2157 MatroskaMuxContext *mkv = s->priv_data;
2159 end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, MATROSKA_ID_CLUSTER, 0, 1);
2160 if (!mkv->have_video) {
2161 for (unsigned i = 0; i < s->nb_streams; i++)
2162 mkv->tracks[i].has_cue = 0;
2164 mkv->cluster_pos = -1;
2165 avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
2168 static int mkv_check_new_extra_data(AVFormatContext *s, const AVPacket *pkt)
2170 MatroskaMuxContext *mkv = s->priv_data;
2171 mkv_track *track = &mkv->tracks[pkt->stream_index];
2172 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2174 int side_data_size = 0, ret;
2176 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
2179 switch (par->codec_id) {
2180 case AV_CODEC_ID_AAC:
2181 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2182 int filler, output_sample_rate = 0;
2183 ret = get_aac_sample_rates(s, side_data, side_data_size, &track->sample_rate,
2184 &output_sample_rate);
2187 if (!output_sample_rate)
2188 output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
2189 ret = ff_alloc_extradata(par, side_data_size);
2192 memcpy(par->extradata, side_data, side_data_size);
2193 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2194 mkv_write_codecprivate(s, mkv->tracks_bc, par, 1, 0);
2195 filler = MAX_PCE_SIZE + 2 + 4 - (avio_tell(mkv->tracks_bc) - track->codecpriv_offset);
2197 put_ebml_void(mkv->tracks_bc, filler);
2198 avio_seek(mkv->tracks_bc, track->sample_rate_offset, SEEK_SET);
2199 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
2200 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
2201 } else if (!par->extradata_size && !track->sample_rate) {
2202 // No extradata (codecpar or packet side data).
2203 av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
2204 return AVERROR(EINVAL);
2207 case AV_CODEC_ID_FLAC:
2208 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2209 uint8_t *old_extradata = par->extradata;
2210 if (side_data_size != par->extradata_size) {
2211 av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
2213 return AVERROR(EINVAL);
2215 par->extradata = side_data;
2216 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2217 mkv_write_codecprivate(s, mkv->tracks_bc, par, 1, 0);
2218 par->extradata = old_extradata;
2221 // FIXME: Remove the following once libaom starts propagating extradata during init()
2222 // See https://bugs.chromium.org/p/aomedia/issues/detail?id=2012
2223 case AV_CODEC_ID_AV1:
2224 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live &&
2225 !par->extradata_size) {
2226 AVIOContext *dyn_cp;
2229 ret = avio_open_dyn_buf(&dyn_cp);
2232 ff_isom_write_av1c(dyn_cp, side_data, side_data_size);
2233 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
2234 if (!codecpriv_size) {
2236 return AVERROR_INVALIDDATA;
2238 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2239 // Do not write the OBUs as we don't have space saved for them
2240 put_ebml_binary(mkv->tracks_bc, MATROSKA_ID_CODECPRIVATE, codecpriv, 4);
2242 ret = ff_alloc_extradata(par, side_data_size);
2245 memcpy(par->extradata, side_data, side_data_size);
2246 } else if (!par->extradata_size)
2247 return AVERROR_INVALIDDATA;
2251 av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
2258 static int mkv_write_packet_internal(AVFormatContext *s, const AVPacket *pkt)
2260 MatroskaMuxContext *mkv = s->priv_data;
2262 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2263 mkv_track *track = &mkv->tracks[pkt->stream_index];
2264 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2265 int duration = pkt->duration;
2267 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2268 int64_t relative_packet_pos;
2270 if (ts == AV_NOPTS_VALUE) {
2271 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2272 return AVERROR(EINVAL);
2274 ts += track->ts_offset;
2276 if (mkv->cluster_pos != -1) {
2277 int64_t cluster_time = ts - mkv->cluster_pts;
2278 if ((int16_t)cluster_time != cluster_time) {
2280 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2284 if (mkv->cluster_pos == -1) {
2285 ret = start_ebml_master_crc32(&mkv->cluster_bc, mkv);
2288 mkv->cluster_pos = avio_tell(s->pb);
2289 put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2290 mkv->cluster_pts = FFMAX(0, ts);
2291 av_log(s, AV_LOG_DEBUG,
2292 "Starting new cluster with timestamp "
2293 "%" PRId64 " at offset %" PRId64 " bytes\n",
2294 mkv->cluster_pts, mkv->cluster_pos);
2296 pb = mkv->cluster_bc;
2298 relative_packet_pos = avio_tell(pb);
2300 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2301 ret = mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2304 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && keyframe &&
2305 (par->codec_type == AVMEDIA_TYPE_VIDEO || !mkv->have_video && !track->has_cue)) {
2306 ret = mkv_add_cuepoint(mkv, pkt->stream_index, ts,
2307 mkv->cluster_pos, relative_packet_pos, -1);
2313 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2314 duration = mkv_write_vtt_blocks(s, pb, pkt);
2316 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2317 mkv_blockgroup_size(pkt->size,
2318 track->track_num_size));
2320 #if FF_API_CONVERGENCE_DURATION
2321 FF_DISABLE_DEPRECATION_WARNINGS
2322 /* For backward compatibility, prefer convergence_duration. */
2323 if (pkt->convergence_duration > 0) {
2324 duration = pkt->convergence_duration;
2326 FF_ENABLE_DEPRECATION_WARNINGS
2328 /* All subtitle blocks are considered to be keyframes. */
2329 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2330 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2331 end_ebml_master(pb, blockgroup);
2334 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
2335 ret = mkv_add_cuepoint(mkv, pkt->stream_index, ts,
2336 mkv->cluster_pos, relative_packet_pos, duration);
2342 mkv->duration = FFMAX(mkv->duration, ts + duration);
2343 track->duration = FFMAX(track->duration, ts + duration);
2348 static int mkv_write_packet(AVFormatContext *s, const AVPacket *pkt)
2350 MatroskaMuxContext *mkv = s->priv_data;
2351 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2352 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2354 int64_t cluster_time;
2356 int start_new_cluster;
2358 ret = mkv_check_new_extra_data(s, pkt);
2362 if (mkv->cluster_pos != -1) {
2363 if (mkv->tracks[pkt->stream_index].write_dts)
2364 cluster_time = pkt->dts - mkv->cluster_pts;
2366 cluster_time = pkt->pts - mkv->cluster_pts;
2367 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2369 cluster_size = avio_tell(mkv->cluster_bc);
2371 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2372 // WebM DASH specification states that the first block of
2373 // every Cluster has to be a key frame. So for DASH video,
2374 // we only create a Cluster on seeing key frames.
2375 start_new_cluster = keyframe;
2376 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2377 cluster_time > mkv->cluster_time_limit) {
2378 // For DASH audio, we create a Cluster based on cluster_time_limit.
2379 start_new_cluster = 1;
2380 } else if (!mkv->is_dash &&
2381 (cluster_size > mkv->cluster_size_limit ||
2382 cluster_time > mkv->cluster_time_limit ||
2383 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2384 cluster_size > 4 * 1024))) {
2385 start_new_cluster = 1;
2387 start_new_cluster = 0;
2389 if (start_new_cluster)
2393 if (!mkv->cluster_pos)
2394 avio_write_marker(s->pb,
2395 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2396 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2398 // check if we have an audio packet cached
2399 if (mkv->cur_audio_pkt.size > 0) {
2400 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
2401 av_packet_unref(&mkv->cur_audio_pkt);
2403 av_log(s, AV_LOG_ERROR,
2404 "Could not write cached audio packet ret:%d\n", ret);
2409 // buffer an audio packet to ensure the packet containing the video
2410 // keyframe's timecode is contained in the same cluster for WebM
2411 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2413 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2415 ret = mkv_write_packet_internal(s, pkt);
2419 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2421 MatroskaMuxContext *mkv = s->priv_data;
2424 if (mkv->cluster_pos != -1) {
2426 av_log(s, AV_LOG_DEBUG,
2427 "Flushing cluster at offset %" PRIu64 " bytes\n",
2432 return mkv_write_packet(s, pkt);
2435 static int mkv_write_trailer(AVFormatContext *s)
2437 MatroskaMuxContext *mkv = s->priv_data;
2438 AVIOContext *pb = s->pb;
2441 // check if we have an audio packet cached
2442 if (mkv->cur_audio_pkt.size > 0) {
2443 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
2445 av_log(s, AV_LOG_ERROR,
2446 "Could not write cached audio packet ret:%d\n", ret);
2451 if (mkv->cluster_pos != -1) {
2452 end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv,
2453 MATROSKA_ID_CLUSTER, 0, 0);
2456 ret = mkv_write_chapters(s);
2461 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2462 int64_t endpos, ret64;
2464 endpos = avio_tell(pb);
2466 if (mkv->cues.num_entries) {
2467 AVIOContext *cues = NULL;
2469 int64_t cuespos = endpos;
2470 int length_size = 0;
2472 ret = start_ebml_master_crc32(&cues, mkv);
2476 ret = mkv_assemble_cues(s->streams, cues, &mkv->cues,
2477 mkv->tracks, s->nb_streams);
2479 ffio_free_dyn_buf(&cues);
2483 if (mkv->reserve_cues_space) {
2484 size = avio_tell(cues);
2485 length_size = ebml_length_size(size);
2486 size += 4 + length_size;
2487 if (mkv->reserve_cues_space < size) {
2488 av_log(s, AV_LOG_WARNING,
2489 "Insufficient space reserved for Cues: "
2490 "%d < %"PRIu64". No Cues will be output.\n",
2491 mkv->reserve_cues_space, size);
2492 mkv->reserve_cues_space = -1;
2493 ffio_free_dyn_buf(&cues);
2496 cuespos = mkv->cues_pos;
2497 if ((ret64 = avio_seek(pb, mkv->cues_pos, SEEK_SET)) < 0) {
2498 ffio_free_dyn_buf(&cues);
2501 if (mkv->reserve_cues_space == size + 1) {
2502 /* There is no way to reserve a single byte because
2503 * the minimal size of an EBML Void element is 2
2504 * (1 byte ID, 1 byte length field). This problem
2505 * is solved by writing the Cues' length field on
2506 * one byte more than necessary. */
2512 mkv_add_seekhead_entry(mkv, MATROSKA_ID_CUES, cuespos);
2513 end_ebml_master_crc32(pb, &cues, mkv, MATROSKA_ID_CUES,
2515 if (mkv->reserve_cues_space) {
2516 if (size < mkv->reserve_cues_space)
2517 put_ebml_void(pb, mkv->reserve_cues_space - size);
2519 endpos = avio_tell(pb);
2523 ret = mkv_write_seekhead(pb, mkv, 1, mkv->info_pos);
2527 // update the duration
2528 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2529 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2530 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2531 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, MATROSKA_ID_INFO, 0, 0);
2533 if (mkv->tracks_bc) {
2534 // write Tracks master
2535 avio_seek(pb, mkv->tracks_pos, SEEK_SET);
2536 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv,
2537 MATROSKA_ID_TRACKS, 0, 0);
2540 // update stream durations
2543 for (i = 0; i < s->nb_streams; ++i) {
2544 const AVStream *st = s->streams[i];
2545 const mkv_track *track = &mkv->tracks[i];
2547 if (track->duration_offset > 0) {
2548 double duration_sec = track->duration * av_q2d(st->time_base);
2549 char duration_string[20] = "";
2551 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2554 avio_seek(mkv->tags_bc, track->duration_offset, SEEK_SET);
2556 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2557 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2558 fmod(duration_sec, 60));
2560 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2564 avio_seek(pb, mkv->tags_pos, SEEK_SET);
2565 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS, 0, 0);
2568 avio_seek(pb, endpos, SEEK_SET);
2572 end_ebml_master(pb, mkv->segment);
2574 return mkv->reserve_cues_space < 0 ? AVERROR(EINVAL) : 0;
2577 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2580 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2581 if (ff_mkv_codec_tags[i].id == codec_id)
2584 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2585 enum AVMediaType type = avcodec_get_type(codec_id);
2586 // mkv theoretically supports any video/audio through VFW/ACM
2587 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2594 static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
2597 for (i = 0; ff_webm_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2598 if (ff_webm_codec_tags[i].id == codec_id)
2604 static uint64_t mkv_get_uid(const mkv_track *tracks, int i, AVLFG *c)
2609 uid = (uint64_t)av_lfg_get(c) << 32;
2610 uid |= av_lfg_get(c);
2613 for (k = 0; k < i; k++) {
2614 if (tracks[k].uid == uid)
2622 static int mkv_init(struct AVFormatContext *s)
2624 MatroskaMuxContext *mkv = s->priv_data;
2626 unsigned nb_tracks = 0;
2629 for (i = 0; i < s->nb_streams; i++) {
2630 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
2631 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
2632 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
2633 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
2634 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
2635 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
2636 av_log(s, AV_LOG_ERROR,
2637 "The Matroska muxer does not yet support muxing %s\n",
2638 avcodec_get_name(s->streams[i]->codecpar->codec_id));
2639 return AVERROR_PATCHWELCOME;
2643 if (s->avoid_negative_ts < 0) {
2644 s->avoid_negative_ts = 1;
2645 s->internal->avoid_negative_ts_use_pts = 1;
2648 if (!strcmp(s->oformat->name, "webm")) {
2649 mkv->mode = MODE_WEBM;
2652 mkv->mode = MODE_MATROSKAv2;
2654 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
2656 return AVERROR(ENOMEM);
2658 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
2659 av_lfg_init(&c, av_get_random_seed());
2661 // Calculate the SegmentUID now in order not to waste our random seed.
2662 for (i = 0; i < 4; i++)
2663 mkv->segment_uid[i] = av_lfg_get(&c);
2666 for (i = 0; i < s->nb_streams; i++) {
2667 AVStream *st = s->streams[i];
2668 mkv_track *track = &mkv->tracks[i];
2670 if (s->flags & AVFMT_FLAG_BITEXACT) {
2673 track->uid = mkv_get_uid(mkv->tracks, i, &c);
2676 // ms precision is the de-facto standard timescale for mkv files
2677 avpriv_set_pts_info(st, 64, 1, 1000);
2679 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
2680 if (mkv->mode == MODE_WEBM) {
2681 av_log(s, AV_LOG_WARNING, "Stream %d will be ignored "
2682 "as WebM doesn't support attachments.\n", i);
2684 mkv->nb_attachments++;
2689 track->track_num = mkv->is_dash ? mkv->dash_track_number : nb_tracks;
2690 track->track_num_size = ebml_num_size(track->track_num);
2693 if (mkv->is_dash && nb_tracks != 1)
2694 return AVERROR(EINVAL);
2699 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2702 AVStream *st = s->streams[pkt->stream_index];
2704 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2705 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2706 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2707 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2708 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2714 static const AVCodecTag additional_audio_tags[] = {
2715 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2716 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2717 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2718 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2719 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2720 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2721 { AV_CODEC_ID_QDMC, 0xFFFFFFFF },
2722 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2723 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2724 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2725 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2726 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2727 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2730 static const AVCodecTag additional_video_tags[] = {
2731 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2732 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2733 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2734 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2737 static const AVCodecTag additional_subtitle_tags[] = {
2738 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2739 { AV_CODEC_ID_DVD_SUBTITLE, 0xFFFFFFFF },
2740 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2741 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2744 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2745 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2746 static const AVOption options[] = {
2747 { "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 },
2748 { "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 },
2749 { "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 },
2750 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2751 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
2752 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2753 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2754 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2755 { "default_mode", "Controls how a track's FlagDefault is inferred", OFFSET(default_mode), AV_OPT_TYPE_INT, { .i64 = DEFAULT_MODE_INFER }, DEFAULT_MODE_INFER, DEFAULT_MODE_PASSTHROUGH, FLAGS, "default_mode" },
2756 { "infer", "For each track type, mark the first track of disposition default as default; if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER }, 0, 0, FLAGS, "default_mode" },
2757 { "infer_no_subs", "For each track type, mark the first track of disposition default as default; for audio and video: if none exists, mark the first track as default.", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_INFER_NO_SUBS }, 0, 0, FLAGS, "default_mode" },
2758 { "passthrough", "Use the disposition flag as-is", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_PASSTHROUGH }, 0, 0, FLAGS, "default_mode" },
2762 #if CONFIG_MATROSKA_MUXER
2763 static const AVClass matroska_class = {
2764 .class_name = "matroska muxer",
2765 .item_name = av_default_item_name,
2767 .version = LIBAVUTIL_VERSION_INT,
2770 AVOutputFormat ff_matroska_muxer = {
2772 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2773 .mime_type = "video/x-matroska",
2774 .extensions = "mkv",
2775 .priv_data_size = sizeof(MatroskaMuxContext),
2776 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2777 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2778 .video_codec = CONFIG_LIBX264_ENCODER ?
2779 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2781 .deinit = mkv_deinit,
2782 .write_header = mkv_write_header,
2783 .write_packet = mkv_write_flush_packet,
2784 .write_trailer = mkv_write_trailer,
2785 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2786 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2787 .codec_tag = (const AVCodecTag* const []){
2788 ff_codec_bmp_tags, ff_codec_wav_tags,
2789 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2791 .subtitle_codec = AV_CODEC_ID_ASS,
2792 .query_codec = mkv_query_codec,
2793 .check_bitstream = mkv_check_bitstream,
2794 .priv_class = &matroska_class,
2798 #if CONFIG_WEBM_MUXER
2799 static const AVClass webm_class = {
2800 .class_name = "webm muxer",
2801 .item_name = av_default_item_name,
2803 .version = LIBAVUTIL_VERSION_INT,
2806 AVOutputFormat ff_webm_muxer = {
2808 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2809 .mime_type = "video/webm",
2810 .extensions = "webm",
2811 .priv_data_size = sizeof(MatroskaMuxContext),
2812 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2813 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2814 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2816 .deinit = mkv_deinit,
2817 .write_header = mkv_write_header,
2818 .write_packet = mkv_write_flush_packet,
2819 .write_trailer = mkv_write_trailer,
2820 .query_codec = webm_query_codec,
2821 .check_bitstream = mkv_check_bitstream,
2822 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2823 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2824 .priv_class = &webm_class,
2828 #if CONFIG_MATROSKA_AUDIO_MUXER
2829 static const AVClass mka_class = {
2830 .class_name = "matroska audio muxer",
2831 .item_name = av_default_item_name,
2833 .version = LIBAVUTIL_VERSION_INT,
2835 AVOutputFormat ff_matroska_audio_muxer = {
2837 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2838 .mime_type = "audio/x-matroska",
2839 .extensions = "mka",
2840 .priv_data_size = sizeof(MatroskaMuxContext),
2841 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2842 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2843 .video_codec = AV_CODEC_ID_NONE,
2845 .deinit = mkv_deinit,
2846 .write_header = mkv_write_header,
2847 .write_packet = mkv_write_flush_packet,
2848 .write_trailer = mkv_write_trailer,
2849 .check_bitstream = mkv_check_bitstream,
2850 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2852 .codec_tag = (const AVCodecTag* const []){
2853 ff_codec_wav_tags, additional_audio_tags, 0
2855 .priv_class = &mka_class,