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 (potentially twice) and Cues */
59 #define MAX_SEEKHEAD_ENTRIES 7
61 #define IS_SEEKABLE(pb, mkv) (((pb)->seekable & AVIO_SEEKABLE_NORMAL) && \
66 DEFAULT_MODE_INFER_NO_SUBS,
67 DEFAULT_MODE_PASSTHROUGH,
70 typedef struct ebml_master {
71 int64_t pos; ///< absolute offset in the containing AVIOContext where the master's elements start
72 int sizebytes; ///< how many bytes were reserved for the size
75 typedef struct ebml_stored_master {
80 typedef struct mkv_seekhead_entry {
85 typedef struct mkv_seekhead {
87 mkv_seekhead_entry entries[MAX_SEEKHEAD_ENTRIES];
92 typedef struct mkv_cuepoint {
95 int64_t cluster_pos; ///< offset of the cluster containing the block relative to the segment
96 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
97 int64_t duration; ///< duration of the block according to time base
100 typedef struct mkv_cues {
101 mkv_cuepoint *entries;
105 typedef struct mkv_track {
112 int64_t sample_rate_offset;
113 int64_t last_timestamp;
115 int64_t duration_offset;
116 int64_t codecpriv_offset;
120 #define MODE_MATROSKAv2 0x01
121 #define MODE_WEBM 0x02
123 typedef struct MatroskaMuxContext {
124 const AVClass *class;
126 ebml_stored_master info;
127 ebml_stored_master track;
128 ebml_stored_master tags;
129 int64_t segment_offset;
130 AVIOContext *cluster_bc;
131 int64_t cluster_pos; ///< file offset of the current Cluster
133 int64_t duration_offset;
136 mkv_seekhead seekhead;
140 AVPacket cur_audio_pkt;
142 unsigned nb_attachments;
148 int reserve_cues_space;
149 int cluster_size_limit;
150 int64_t cluster_time_limit;
155 int dash_track_number;
160 uint32_t segment_uid[4];
161 } MatroskaMuxContext;
163 /** 2 bytes * 7 for EBML IDs, 7 1-byte EBML lengths, 6 1-byte uint,
164 * 8 byte for "matroska" doctype string */
165 #define MAX_EBML_HEADER_SIZE 35
167 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
168 * offset, 4 bytes for target EBML ID */
169 #define MAX_SEEKENTRY_SIZE 21
171 /** 4 * (1-byte EBML ID, 1-byte EBML size, 8-byte uint max) */
172 #define MAX_CUETRACKPOS_SIZE 40
174 /** Seek preroll value for opus */
175 #define OPUS_SEEK_PREROLL 80000000
177 static int ebml_id_size(uint32_t id)
179 return (av_log2(id) + 7U) / 8;
182 static void put_ebml_id(AVIOContext *pb, uint32_t id)
184 int i = ebml_id_size(id);
186 avio_w8(pb, (uint8_t)(id >> (i * 8)));
190 * Write an EBML size meaning "unknown size".
192 * @param bytes The number of bytes the size should occupy (maximum: 8).
194 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
196 av_assert0(bytes <= 8);
197 avio_w8(pb, 0x1ff >> bytes);
198 ffio_fill(pb, 0xff, bytes - 1);
202 * Returns how many bytes are needed to represent a number
203 * as EBML variable length integer.
205 static int ebml_num_size(uint64_t num)
215 * Calculate how many bytes are needed to represent the length field
216 * of an EBML element whose payload has a given length.
218 static int ebml_length_size(uint64_t length)
220 return ebml_num_size(length + 1);
224 * Write a number as EBML variable length integer on `bytes` bytes.
225 * `bytes` is taken literally without checking.
227 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
229 num |= 1ULL << bytes * 7;
230 for (int i = bytes - 1; i >= 0; i--)
231 avio_w8(pb, (uint8_t)(num >> i * 8));
235 * Write a length as EBML variable length integer.
237 * @param bytes The number of bytes that need to be used to write the number.
238 * If zero, the minimal number of bytes will be used.
240 static void put_ebml_length(AVIOContext *pb, uint64_t length, int bytes)
242 int needed_bytes = ebml_length_size(length);
244 // sizes larger than this are currently undefined in EBML
245 av_assert0(length < (1ULL << 56) - 1);
248 bytes = needed_bytes;
249 // The bytes needed to write the given size must not exceed
250 // the bytes that we ought to use.
251 av_assert0(bytes >= needed_bytes);
252 put_ebml_num(pb, length, bytes);
256 * Write a (random) UID with fixed size to make the output more deterministic
258 static void put_ebml_uid(AVIOContext *pb, uint32_t elementid, uint64_t uid)
260 put_ebml_id(pb, elementid);
261 put_ebml_length(pb, 8, 0);
265 static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
272 put_ebml_id(pb, elementid);
273 put_ebml_length(pb, bytes, 0);
274 for (i = bytes - 1; i >= 0; i--)
275 avio_w8(pb, (uint8_t)(val >> i * 8));
278 static void put_ebml_sint(AVIOContext *pb, uint32_t elementid, int64_t val)
281 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
286 put_ebml_id(pb, elementid);
287 put_ebml_length(pb, bytes, 0);
288 for (i = bytes - 1; i >= 0; i--)
289 avio_w8(pb, (uint8_t)(val >> i * 8));
292 static void put_ebml_float(AVIOContext *pb, uint32_t elementid, double val)
294 put_ebml_id(pb, elementid);
295 put_ebml_length(pb, 8, 0);
296 avio_wb64(pb, av_double2int(val));
299 static void put_ebml_binary(AVIOContext *pb, uint32_t elementid,
300 const void *buf, int size)
302 put_ebml_id(pb, elementid);
303 put_ebml_length(pb, size, 0);
304 avio_write(pb, buf, size);
307 static void put_ebml_string(AVIOContext *pb, uint32_t elementid,
310 put_ebml_binary(pb, elementid, str, strlen(str));
314 * Write a void element of a given size. Useful for reserving space in
315 * the file to be written to later.
317 * @param size The number of bytes to reserve, which must be at least 2.
319 static void put_ebml_void(AVIOContext *pb, int size)
321 av_assert0(size >= 2);
323 put_ebml_id(pb, EBML_ID_VOID);
324 // we need to subtract the length needed to store the size from the
325 // size we need to reserve so 2 cases, we use 8 bytes to store the
326 // size if possible, 1 byte otherwise
329 put_ebml_length(pb, size, 0);
332 put_ebml_length(pb, size, 8);
334 ffio_fill(pb, 0, size);
337 static ebml_master start_ebml_master(AVIOContext *pb, uint32_t elementid,
338 uint64_t expectedsize)
340 int bytes = expectedsize ? ebml_length_size(expectedsize) : 8;
342 put_ebml_id(pb, elementid);
343 put_ebml_size_unknown(pb, bytes);
344 return (ebml_master) { avio_tell(pb), bytes };
347 static void end_ebml_master(AVIOContext *pb, ebml_master master)
349 int64_t pos = avio_tell(pb);
351 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
353 put_ebml_length(pb, pos - master.pos, master.sizebytes);
354 avio_seek(pb, pos, SEEK_SET);
357 static void mkv_add_seekhead_entry(MatroskaMuxContext *mkv, uint32_t elementid,
360 mkv_seekhead *seekhead = &mkv->seekhead;
362 av_assert1(seekhead->num_entries < MAX_SEEKHEAD_ENTRIES);
364 seekhead->entries[seekhead->num_entries].elementid = elementid;
365 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - mkv->segment_offset;
368 static int start_ebml_master_crc32(AVIOContext **dyn_cp, MatroskaMuxContext *mkv)
372 if (!*dyn_cp && (ret = avio_open_dyn_buf(dyn_cp)) < 0)
376 put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
381 static int end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp,
382 MatroskaMuxContext *mkv, uint32_t id,
383 int length_size, int keep_buffer,
386 uint8_t *buf, crc[4];
387 int ret, size, skip = 0;
389 size = avio_get_dyn_buf(*dyn_cp, &buf);
390 if ((ret = (*dyn_cp)->error) < 0)
394 mkv_add_seekhead_entry(mkv, id, avio_tell(pb));
397 put_ebml_length(pb, size, length_size);
398 if (mkv->write_crc) {
399 skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
400 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
401 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
403 avio_write(pb, buf + skip, size - skip);
407 ffio_reset_dyn_buf(*dyn_cp);
409 ffio_free_dyn_buf(dyn_cp);
415 * Output EBML master. Keep the buffer if seekable, allowing for later updates.
416 * Furthermore always add a SeekHead Entry for this element.
418 static int end_ebml_master_crc32_tentatively(AVIOContext *pb,
419 ebml_stored_master *elem,
420 MatroskaMuxContext *mkv, uint32_t id)
422 if (IS_SEEKABLE(pb, mkv)) {
424 int size = avio_get_dyn_buf(elem->bc, &buf);
426 if (elem->bc->error < 0)
427 return elem->bc->error;
429 elem->pos = avio_tell(pb);
430 mkv_add_seekhead_entry(mkv, id, elem->pos);
433 put_ebml_length(pb, size, 0);
434 avio_write(pb, buf, size);
438 return end_ebml_master_crc32(pb, &elem->bc, mkv, id, 0, 0, 1);
441 static void put_xiph_size(AVIOContext *pb, int size)
443 ffio_fill(pb, 255, size / 255);
444 avio_w8(pb, size % 255);
448 * Free the members allocated in the mux context.
450 static void mkv_deinit(AVFormatContext *s)
452 MatroskaMuxContext *mkv = s->priv_data;
454 av_packet_unref(&mkv->cur_audio_pkt);
456 ffio_free_dyn_buf(&mkv->cluster_bc);
457 ffio_free_dyn_buf(&mkv->info.bc);
458 ffio_free_dyn_buf(&mkv->track.bc);
459 ffio_free_dyn_buf(&mkv->tags.bc);
461 av_freep(&mkv->cues.entries);
462 av_freep(&mkv->tracks);
466 * Initialize the SeekHead element to be ready to index level 1 Matroska
467 * elements. Enough space to write MAX_SEEKHEAD_ENTRIES SeekHead entries
468 * will be reserved at the current file location.
470 static void mkv_start_seekhead(MatroskaMuxContext *mkv, AVIOContext *pb)
472 mkv->seekhead.filepos = avio_tell(pb);
473 // 21 bytes max for a Seek entry, 6 bytes max for the SeekHead ID
474 // and size, 6 bytes for a CRC32 element, and 2 bytes to guarantee
475 // that an EBML void element will fit afterwards
476 mkv->seekhead.reserved_size = MAX_SEEKHEAD_ENTRIES * MAX_SEEKENTRY_SIZE + 14;
477 put_ebml_void(pb, mkv->seekhead.reserved_size);
481 * Write the SeekHead to the file at the location reserved for it
482 * and seek to destpos afterwards. When error_on_seek_failure
483 * is not set, failure to seek to the position designated for the
484 * SeekHead is not considered an error and it is presumed that
485 * destpos is the current position; failure to seek to destpos
486 * afterwards is always an error.
488 * @return 0 on success, < 0 on error.
490 static int mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv,
491 int error_on_seek_failure, int64_t destpos)
493 AVIOContext *dyn_cp = NULL;
494 mkv_seekhead *seekhead = &mkv->seekhead;
495 int64_t remaining, ret64;
498 if ((ret64 = avio_seek(pb, seekhead->filepos, SEEK_SET)) < 0)
499 return error_on_seek_failure ? ret64 : 0;
501 ret = start_ebml_master_crc32(&dyn_cp, mkv);
505 for (i = 0; i < seekhead->num_entries; i++) {
506 mkv_seekhead_entry *entry = &seekhead->entries[i];
507 ebml_master seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY,
510 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
511 put_ebml_length(dyn_cp, ebml_id_size(entry->elementid), 0);
512 put_ebml_id(dyn_cp, entry->elementid);
514 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
515 end_ebml_master(dyn_cp, seekentry);
517 ret = end_ebml_master_crc32(pb, &dyn_cp, mkv,
518 MATROSKA_ID_SEEKHEAD, 0, 0, 0);
522 remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
523 put_ebml_void(pb, remaining);
525 if ((ret64 = avio_seek(pb, destpos, SEEK_SET)) < 0)
531 static int mkv_add_cuepoint(MatroskaMuxContext *mkv, int stream, int64_t ts,
532 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
534 mkv_cues *cues = &mkv->cues;
535 mkv_cuepoint *entries = cues->entries;
540 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
542 return AVERROR(ENOMEM);
543 cues->entries = entries;
545 cues->entries[cues->num_entries].pts = ts;
546 cues->entries[cues->num_entries].stream_idx = stream;
547 cues->entries[cues->num_entries].cluster_pos = cluster_pos - mkv->segment_offset;
548 cues->entries[cues->num_entries].relative_pos = relative_pos;
549 cues->entries[cues->num_entries++].duration = duration;
554 static int mkv_assemble_cues(AVStream **streams, AVIOContext *dyn_cp,
555 mkv_cues *cues, mkv_track *tracks, int num_tracks)
557 AVIOContext *cuepoint;
560 ret = avio_open_dyn_buf(&cuepoint);
564 for (mkv_cuepoint *entry = cues->entries, *end = entry + cues->num_entries;
566 uint64_t pts = entry->pts;
570 put_ebml_uint(cuepoint, MATROSKA_ID_CUETIME, pts);
572 // put all the entries from different tracks that have the exact same
573 // timestamp into the same CuePoint
574 for (int j = 0; j < num_tracks; j++)
575 tracks[j].has_cue = 0;
577 ebml_master track_positions;
578 int idx = entry->stream_idx;
580 av_assert0(idx >= 0 && idx < num_tracks);
581 if (tracks[idx].has_cue && streams[idx]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
583 tracks[idx].has_cue = 1;
584 track_positions = start_ebml_master(cuepoint, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
585 put_ebml_uint(cuepoint, MATROSKA_ID_CUETRACK , tracks[idx].track_num);
586 put_ebml_uint(cuepoint, MATROSKA_ID_CUECLUSTERPOSITION , entry->cluster_pos);
587 put_ebml_uint(cuepoint, MATROSKA_ID_CUERELATIVEPOSITION, entry->relative_pos);
588 if (entry->duration != -1)
589 put_ebml_uint(cuepoint, MATROSKA_ID_CUEDURATION , entry->duration);
590 end_ebml_master(cuepoint, track_positions);
591 } while (++entry < end && entry->pts == pts);
592 size = avio_get_dyn_buf(cuepoint, &buf);
593 if ((ret = cuepoint->error) < 0)
595 put_ebml_binary(dyn_cp, MATROSKA_ID_POINTENTRY, buf, size);
596 ffio_reset_dyn_buf(cuepoint);
598 ffio_free_dyn_buf(&cuepoint);
603 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb,
604 const AVCodecParameters *par)
606 const uint8_t *header_start[3];
608 int first_header_size;
611 if (par->codec_id == AV_CODEC_ID_VORBIS)
612 first_header_size = 30;
614 first_header_size = 42;
616 err = avpriv_split_xiph_headers(par->extradata, par->extradata_size,
617 first_header_size, header_start, header_len);
619 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
623 avio_w8(pb, 2); // number packets - 1
624 for (j = 0; j < 2; j++) {
625 put_xiph_size(pb, header_len[j]);
627 for (j = 0; j < 3; j++)
628 avio_write(pb, header_start[j], header_len[j]);
633 static int put_wv_codecpriv(AVIOContext *pb, const AVCodecParameters *par)
635 if (par->extradata && par->extradata_size == 2)
636 avio_write(pb, par->extradata, 2);
638 avio_wl16(pb, 0x410); // fallback to the most recent version
642 static int put_flac_codecpriv(AVFormatContext *s, AVIOContext *pb,
643 const AVCodecParameters *par)
645 int write_comment = (par->channel_layout &&
646 !(par->channel_layout & ~0x3ffffULL) &&
647 !ff_flac_is_native_layout(par->channel_layout));
648 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
655 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
656 "Lavf" : LIBAVFORMAT_IDENT;
657 AVDictionary *dict = NULL;
661 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
662 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
664 len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
665 av_assert1(len < (1 << 24) - 4);
670 ff_vorbiscomment_write(pb, dict, vendor, NULL, 0);
678 static int get_aac_sample_rates(AVFormatContext *s, MatroskaMuxContext *mkv,
679 const uint8_t *extradata, int extradata_size,
680 int *sample_rate, int *output_sample_rate)
682 MPEG4AudioConfig mp4ac;
685 ret = avpriv_mpeg4audio_get_config2(&mp4ac, extradata, extradata_size, 1, s);
686 /* Don't abort if the failure is because of missing extradata. Assume in that
687 * case a bitstream filter will provide the muxer with the extradata in the
689 * Abort however if s->pb is not seekable, as we would not be able to seek back
690 * to write the sample rate elements once the extradata shows up, anyway. */
691 if (ret < 0 && (extradata_size || !IS_SEEKABLE(s->pb, mkv))) {
692 av_log(s, AV_LOG_ERROR,
693 "Error parsing AAC extradata, unable to determine samplerate.\n");
694 return AVERROR(EINVAL);
698 /* This will only happen when this function is called while writing the
699 * header and no extradata is available. The space for this element has
700 * to be reserved for when this function is called again after the
701 * extradata shows up in the first packet, as there's no way to know if
702 * output_sample_rate will be different than sample_rate or not. */
703 *output_sample_rate = *sample_rate;
705 *sample_rate = mp4ac.sample_rate;
706 *output_sample_rate = mp4ac.ext_sample_rate;
711 static int mkv_write_native_codecprivate(AVFormatContext *s, AVIOContext *pb,
712 const AVCodecParameters *par,
715 switch (par->codec_id) {
716 case AV_CODEC_ID_VORBIS:
717 case AV_CODEC_ID_THEORA:
718 return put_xiph_codecpriv(s, dyn_cp, par);
719 case AV_CODEC_ID_FLAC:
720 return put_flac_codecpriv(s, dyn_cp, par);
721 case AV_CODEC_ID_WAVPACK:
722 return put_wv_codecpriv(dyn_cp, par);
723 case AV_CODEC_ID_H264:
724 return ff_isom_write_avcc(dyn_cp, par->extradata,
725 par->extradata_size);
726 case AV_CODEC_ID_HEVC:
727 return ff_isom_write_hvcc(dyn_cp, par->extradata,
728 par->extradata_size, 0);
729 case AV_CODEC_ID_AV1:
730 if (par->extradata_size)
731 return ff_isom_write_av1c(dyn_cp, par->extradata,
732 par->extradata_size);
734 put_ebml_void(pb, 4 + 3);
736 case AV_CODEC_ID_ALAC:
737 if (par->extradata_size < 36) {
738 av_log(s, AV_LOG_ERROR,
739 "Invalid extradata found, ALAC expects a 36-byte "
741 return AVERROR_INVALIDDATA;
743 avio_write(dyn_cp, par->extradata + 12,
744 par->extradata_size - 12);
746 case AV_CODEC_ID_AAC:
747 if (par->extradata_size)
748 avio_write(dyn_cp, par->extradata, par->extradata_size);
750 put_ebml_void(pb, MAX_PCE_SIZE + 2 + 4);
753 if (par->codec_id == AV_CODEC_ID_PRORES &&
754 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
755 avio_wl32(dyn_cp, par->codec_tag);
756 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
757 avio_write(dyn_cp, par->extradata, par->extradata_size);
763 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
764 AVCodecParameters *par,
765 int native_id, int qt_id)
768 MatroskaMuxContext *mkv = s->priv_data;
770 int ret, codecpriv_size;
772 ret = avio_open_dyn_buf(&dyn_cp);
777 ret = mkv_write_native_codecprivate(s, pb, par, dyn_cp);
778 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
781 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
783 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
784 && (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
787 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
788 avio_wl32(dyn_cp, par->codec_tag);
789 for(i = 0; i < 0x5a - 8; i++)
792 avio_write(dyn_cp, par->extradata, par->extradata_size);
794 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
795 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
796 avcodec_get_name(par->codec_id));
799 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
801 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
802 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
803 avcodec_get_name(par->codec_id));
804 ret = AVERROR(EINVAL);
807 ff_put_bmp_header(dyn_cp, par, 0, 0, mkv->flipped_raw_rgb);
809 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
811 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
813 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
814 avcodec_get_name(par->codec_id));
815 ret = AVERROR(EINVAL);
818 par->codec_tag = tag;
820 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
824 codecpriv_size = avio_get_dyn_buf(dyn_cp, &codecpriv);
825 if ((ret = dyn_cp->error) >= 0 && codecpriv_size)
826 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
829 ffio_free_dyn_buf(&dyn_cp);
833 static void mkv_write_video_color(AVIOContext *pb, const AVStream *st,
834 const AVCodecParameters *par)
836 /* 18 Elements with two bytes ID, one byte length field, 8 bytes payload
837 * a master element with two bytes ID and one byte length field
838 * plus another byte to stay clear of the end. */
839 uint8_t colour[(2 + 1 + 8) * 18 + (2 + 1) + 1];
840 AVIOContext buf, *dyn_cp = &buf;
842 const void *side_data;
844 ffio_init_context(dyn_cp, colour, sizeof(colour), 1, NULL, NULL, NULL, NULL);
846 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
847 par->color_trc < AVCOL_TRC_NB) {
848 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
851 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
852 par->color_space < AVCOL_SPC_NB) {
853 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
855 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
856 par->color_primaries < AVCOL_PRI_NB) {
857 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
859 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
860 par->color_range < AVCOL_RANGE_NB) {
861 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
863 if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
864 par->chroma_location <= AVCHROMA_LOC_TOP) {
867 avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
868 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
869 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
872 side_data = av_stream_get_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
875 const AVContentLightMetadata *metadata = side_data;
876 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXCLL, metadata->MaxCLL);
877 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXFALL, metadata->MaxFALL);
880 side_data = av_stream_get_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
883 ebml_master meta_element = start_ebml_master(
884 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 10 * (2 + 1 + 8));
885 const AVMasteringDisplayMetadata *metadata = side_data;
886 if (metadata->has_primaries) {
887 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
888 av_q2d(metadata->display_primaries[0][0]));
889 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
890 av_q2d(metadata->display_primaries[0][1]));
891 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
892 av_q2d(metadata->display_primaries[1][0]));
893 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
894 av_q2d(metadata->display_primaries[1][1]));
895 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
896 av_q2d(metadata->display_primaries[2][0]));
897 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
898 av_q2d(metadata->display_primaries[2][1]));
899 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
900 av_q2d(metadata->white_point[0]));
901 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
902 av_q2d(metadata->white_point[1]));
904 if (metadata->has_luminance) {
905 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
906 av_q2d(metadata->max_luminance));
907 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
908 av_q2d(metadata->min_luminance));
910 end_ebml_master(dyn_cp, meta_element);
913 colorinfo_size = avio_tell(dyn_cp);
915 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLOR, colour, colorinfo_size);
918 static void mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
921 ebml_master projection;
924 const AVSphericalMapping *spherical =
925 (const AVSphericalMapping *)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
931 if (spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR &&
932 spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR_TILE &&
933 spherical->projection != AV_SPHERICAL_CUBEMAP) {
934 av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
938 // Maximally 4 8-byte elements with id-length 2 + 1 byte length field
939 // and the private data of the AV_SPHERICAL_EQUIRECTANGULAR_TILE case
940 projection = start_ebml_master(pb, MATROSKA_ID_VIDEOPROJECTION,
941 4 * (2 + 1 + 8) + (2 + 1 + 20));
943 switch (spherical->projection) {
944 case AV_SPHERICAL_EQUIRECTANGULAR:
945 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
946 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
948 case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
949 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
950 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
951 AV_WB32(private, 0); // version + flags
952 AV_WB32(private + 4, spherical->bound_top);
953 AV_WB32(private + 8, spherical->bound_bottom);
954 AV_WB32(private + 12, spherical->bound_left);
955 AV_WB32(private + 16, spherical->bound_right);
956 put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
959 case AV_SPHERICAL_CUBEMAP:
960 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
961 MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
962 AV_WB32(private, 0); // version + flags
963 AV_WB32(private + 4, 0); // layout
964 AV_WB32(private + 8, spherical->padding);
965 put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
973 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW,
974 (double) spherical->yaw / (1 << 16));
975 if (spherical->pitch)
976 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH,
977 (double) spherical->pitch / (1 << 16));
979 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL,
980 (double) spherical->roll / (1 << 16));
982 end_ebml_master(pb, projection);
985 static void mkv_write_field_order(AVIOContext *pb, int mode,
986 enum AVFieldOrder field_order)
988 switch (field_order) {
989 case AV_FIELD_UNKNOWN:
991 case AV_FIELD_PROGRESSIVE:
992 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
993 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
999 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1000 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
1001 if (mode != MODE_WEBM) {
1002 switch (field_order) {
1004 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1005 MATROSKA_VIDEO_FIELDORDER_TT);
1008 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1009 MATROSKA_VIDEO_FIELDORDER_BB);
1012 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1013 MATROSKA_VIDEO_FIELDORDER_TB);
1016 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1017 MATROSKA_VIDEO_FIELDORDER_BT);
1024 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
1025 AVStream *st, int mode, int *h_width, int *h_height)
1027 const AVDictionaryEntry *tag;
1028 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1029 const AVStereo3D *stereo;
1033 // convert metadata into proper side data and add it to the stream
1034 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
1035 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
1036 int stereo_mode = atoi(tag->value);
1038 for (int i = 0; i < MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
1039 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
1044 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1045 stereo_mode != 10 && stereo_mode != 12) {
1046 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
1052 stereo = (const AVStereo3D*)av_stream_get_side_data(st, AV_PKT_DATA_STEREO3D,
1055 switch (stereo->type) {
1056 case AV_STEREO3D_2D:
1057 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
1059 case AV_STEREO3D_SIDEBYSIDE:
1060 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1061 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
1062 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
1065 case AV_STEREO3D_TOPBOTTOM:
1066 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
1067 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1071 case AV_STEREO3D_CHECKERBOARD:
1072 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
1073 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1076 case AV_STEREO3D_LINES:
1077 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
1078 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1082 case AV_STEREO3D_COLUMNS:
1083 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
1084 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1088 case AV_STEREO3D_FRAMESEQUENCE:
1089 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
1090 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1096 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1099 // if webm, do not write unsupported modes
1100 if ((mode == MODE_WEBM &&
1101 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
1102 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
1103 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
1104 av_log(s, AV_LOG_ERROR,
1105 "The specified stereo mode is not valid.\n");
1106 return AVERROR(EINVAL);
1109 // write StereoMode if format is valid
1110 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1115 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1116 AVStream *st, mkv_track *track, AVIOContext *pb,
1119 AVCodecParameters *par = st->codecpar;
1120 ebml_master subinfo, track_master;
1124 int sample_rate = par->sample_rate;
1125 int output_sample_rate = 0;
1126 int display_width_div = 1;
1127 int display_height_div = 1;
1129 const AVDictionaryEntry *tag;
1131 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1134 if (par->codec_id == AV_CODEC_ID_AAC) {
1135 ret = get_aac_sample_rates(s, mkv, par->extradata, par->extradata_size,
1136 &sample_rate, &output_sample_rate);
1141 track_master = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1142 put_ebml_uint(pb, MATROSKA_ID_TRACKNUMBER, track->track_num);
1143 put_ebml_uid (pb, MATROSKA_ID_TRACKUID, track->uid);
1144 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGLACING, 0); // no lacing (yet)
1146 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1147 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1148 tag = av_dict_get(st->metadata, "language", NULL, 0);
1149 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE,
1150 tag && tag->value[0] ? tag->value : "und");
1152 // The default value for TRACKFLAGDEFAULT is 1, so add element
1153 // if we need to clear it.
1155 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, 0);
1157 if (st->disposition & AV_DISPOSITION_FORCED)
1158 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1160 if (mkv->mode == MODE_WEBM) {
1161 const char *codec_id;
1162 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1163 for (j = 0; ff_webm_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1164 if (ff_webm_codec_tags[j].id == par->codec_id) {
1165 codec_id = ff_webm_codec_tags[j].str;
1170 } else if (par->codec_id == AV_CODEC_ID_WEBVTT) {
1171 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1172 codec_id = "D_WEBVTT/CAPTIONS";
1173 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1174 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1175 codec_id = "D_WEBVTT/DESCRIPTIONS";
1176 native_id = MATROSKA_TRACK_TYPE_METADATA;
1177 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1178 codec_id = "D_WEBVTT/METADATA";
1179 native_id = MATROSKA_TRACK_TYPE_METADATA;
1181 codec_id = "D_WEBVTT/SUBTITLES";
1182 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1187 av_log(s, AV_LOG_ERROR,
1188 "Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1189 return AVERROR(EINVAL);
1192 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1194 if (st->disposition & AV_DISPOSITION_COMMENT)
1195 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGCOMMENTARY, 1);
1196 // look for a codec ID string specific to mkv to use,
1197 // if none are found, use AVI codes
1198 if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
1199 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1200 if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
1201 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1207 if (mkv->allow_raw_vfw) {
1210 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1211 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1212 return AVERROR(EINVAL);
1217 switch (par->codec_type) {
1218 case AVMEDIA_TYPE_VIDEO:
1219 mkv->have_video = 1;
1220 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1222 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1223 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1224 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1225 else if( st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0
1226 && av_cmp_q(av_inv_q(st->r_frame_rate), st->time_base) > 0)
1227 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->r_frame_rate.den / st->r_frame_rate.num);
1230 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1231 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1232 par->codec_id == AV_CODEC_ID_SVQ1 ||
1233 par->codec_id == AV_CODEC_ID_SVQ3 ||
1234 par->codec_id == AV_CODEC_ID_CINEPAK))
1238 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1239 else if (!native_id) {
1240 // if there is no mkv-specific codec ID, use VFW mode
1241 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1242 track->write_dts = 1;
1243 s->internal->avoid_negative_ts_use_pts = 0;
1246 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1248 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1249 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1251 mkv_write_field_order(pb, mkv->mode, par->field_order);
1253 // check both side data and metadata for stereo information,
1254 // write the result to the bitstream if any is found
1255 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1257 &display_height_div);
1261 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1262 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1263 (par->format == AV_PIX_FMT_YUVA420P)) {
1264 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1267 // write DisplayWidth and DisplayHeight, they contain the size of
1268 // a single source view and/or the display aspect ratio
1269 if (st->sample_aspect_ratio.num) {
1270 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1271 if (d_width > INT_MAX) {
1272 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1273 return AVERROR(EINVAL);
1275 if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
1276 if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
1277 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1278 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1280 AVRational display_aspect_ratio;
1281 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
1282 par->width * (int64_t)st->sample_aspect_ratio.num,
1283 par->height * (int64_t)st->sample_aspect_ratio.den,
1285 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
1286 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
1287 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
1290 } else if (display_width_div != 1 || display_height_div != 1) {
1291 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1292 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1293 } else if (mkv->mode != MODE_WEBM)
1294 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1296 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1297 uint32_t color_space = av_le2ne32(par->codec_tag);
1298 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1300 mkv_write_video_color(pb, st, par);
1301 mkv_write_video_projection(s, pb, st);
1303 end_ebml_master(pb, subinfo);
1306 case AVMEDIA_TYPE_AUDIO:
1307 if (par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1308 int64_t codecdelay = av_rescale_q(par->initial_padding,
1309 (AVRational){ 1, 48000 },
1310 (AVRational){ 1, 1000000000 });
1311 if (codecdelay < 0) {
1312 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1313 return AVERROR(EINVAL);
1315 // track->ts_offset = av_rescale_q(par->initial_padding,
1316 // (AVRational){ 1, par->sample_rate },
1319 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1321 if (par->codec_id == AV_CODEC_ID_OPUS)
1322 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1324 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1327 // no mkv-specific ID, use ACM mode
1328 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1330 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 6 + 4 * 9);
1331 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1333 track->sample_rate_offset = avio_tell(pb);
1334 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1335 if (output_sample_rate)
1336 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1338 bit_depth = av_get_bits_per_sample(par->codec_id);
1339 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1340 if (par->bits_per_raw_sample)
1341 bit_depth = par->bits_per_raw_sample;
1343 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1346 bit_depth = par->bits_per_coded_sample;
1348 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1349 end_ebml_master(pb, subinfo);
1352 case AVMEDIA_TYPE_SUBTITLE:
1354 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1355 return AVERROR(ENOSYS);
1358 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1359 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1361 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1364 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1365 return AVERROR(EINVAL);
1368 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1369 track->codecpriv_offset = avio_tell(pb);
1370 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1375 end_ebml_master(pb, track_master);
1380 static int mkv_write_tracks(AVFormatContext *s)
1382 MatroskaMuxContext *mkv = s->priv_data;
1383 AVIOContext *pb = s->pb;
1384 int i, ret, video_default_idx, audio_default_idx, subtitle_default_idx;
1386 if (mkv->nb_attachments == s->nb_streams)
1389 ret = start_ebml_master_crc32(&mkv->track.bc, mkv);
1393 if (mkv->default_mode != DEFAULT_MODE_PASSTHROUGH) {
1394 int video_idx, audio_idx, subtitle_idx;
1396 video_idx = video_default_idx =
1397 audio_idx = audio_default_idx =
1398 subtitle_idx = subtitle_default_idx = -1;
1400 for (i = s->nb_streams - 1; i >= 0; i--) {
1401 AVStream *st = s->streams[i];
1403 switch (st->codecpar->codec_type) {
1404 #define CASE(type, variable) \
1405 case AVMEDIA_TYPE_ ## type: \
1406 variable ## _idx = i; \
1407 if (st->disposition & AV_DISPOSITION_DEFAULT) \
1408 variable ## _default_idx = i; \
1412 CASE(SUBTITLE, subtitle)
1417 video_default_idx = FFMAX(video_default_idx, video_idx);
1418 audio_default_idx = FFMAX(audio_default_idx, audio_idx);
1419 if (mkv->default_mode != DEFAULT_MODE_INFER_NO_SUBS)
1420 subtitle_default_idx = FFMAX(subtitle_default_idx, subtitle_idx);
1422 for (i = 0; i < s->nb_streams; i++) {
1423 AVStream *st = s->streams[i];
1424 int is_default = mkv->default_mode == DEFAULT_MODE_PASSTHROUGH ?
1425 st->disposition & AV_DISPOSITION_DEFAULT :
1426 i == video_default_idx || i == audio_default_idx ||
1427 i == subtitle_default_idx;
1428 ret = mkv_write_track(s, mkv, st, &mkv->tracks[i],
1429 mkv->track.bc, is_default);
1434 return end_ebml_master_crc32_tentatively(pb, &mkv->track, mkv,
1435 MATROSKA_ID_TRACKS);
1438 static int mkv_write_simpletag(AVIOContext *pb, const AVDictionaryEntry *t)
1440 uint8_t *key = av_strdup(t->key);
1442 const uint8_t *lang = NULL;
1446 return AVERROR(ENOMEM);
1448 if ((p = strrchr(p, '-')) &&
1449 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1456 else if (*p >= 'a' && *p <= 'z')
1461 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1462 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1464 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1465 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1466 end_ebml_master(pb, tag);
1472 static int mkv_write_tag_targets(MatroskaMuxContext *mkv, AVIOContext **pb,
1473 ebml_master *tag, uint32_t elementid, uint64_t uid)
1475 ebml_master targets;
1479 ret = start_ebml_master_crc32(pb, mkv);
1484 *tag = start_ebml_master(*pb, MATROSKA_ID_TAG, 0);
1485 targets = start_ebml_master(*pb, MATROSKA_ID_TAGTARGETS, 4 + 1 + 8);
1487 put_ebml_uid(*pb, elementid, uid);
1488 end_ebml_master(*pb, targets);
1492 static int mkv_check_tag_name(const char *name, uint32_t elementid)
1494 return av_strcasecmp(name, "title") &&
1495 av_strcasecmp(name, "stereo_mode") &&
1496 av_strcasecmp(name, "creation_time") &&
1497 av_strcasecmp(name, "encoding_tool") &&
1498 av_strcasecmp(name, "duration") &&
1499 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1500 av_strcasecmp(name, "language")) &&
1501 (elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1502 (av_strcasecmp(name, "filename") &&
1503 av_strcasecmp(name, "mimetype")));
1506 static int mkv_write_tag(MatroskaMuxContext *mkv, const AVDictionary *m,
1507 AVIOContext **pb, ebml_master *tag,
1508 uint32_t elementid, uint64_t uid)
1510 const AVDictionaryEntry *t = NULL;
1514 ret = mkv_write_tag_targets(mkv, pb, tag ? tag : &tag2, elementid, uid);
1518 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1519 if (mkv_check_tag_name(t->key, elementid)) {
1520 ret = mkv_write_simpletag(*pb, t);
1527 end_ebml_master(*pb, tag2);
1532 static int mkv_check_tag(const AVDictionary *m, uint32_t elementid)
1534 const AVDictionaryEntry *t = NULL;
1536 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1537 if (mkv_check_tag_name(t->key, elementid))
1543 static int mkv_write_tags(AVFormatContext *s)
1545 MatroskaMuxContext *mkv = s->priv_data;
1546 ebml_master tag, *tagp = IS_SEEKABLE(s->pb, mkv) ? &tag : NULL;
1549 mkv->wrote_tags = 1;
1551 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1553 if (mkv_check_tag(s->metadata, 0)) {
1554 ret = mkv_write_tag(mkv, s->metadata, &mkv->tags.bc, NULL, 0, 0);
1559 for (i = 0; i < s->nb_streams; i++) {
1560 const AVStream *st = s->streams[i];
1561 mkv_track *track = &mkv->tracks[i];
1563 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1566 if (!tagp && !mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1569 ret = mkv_write_tag(mkv, st->metadata, &mkv->tags.bc, tagp,
1570 MATROSKA_ID_TAGTARGETS_TRACKUID, track->uid);
1575 AVIOContext *pb = mkv->tags.bc;
1576 ebml_master simpletag;
1578 simpletag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG,
1580 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1581 track->duration_offset = avio_tell(pb);
1583 // Reserve space to write duration as a 20-byte string.
1584 // 2 (ebml id) + 1 (data size) + 20 (data)
1585 put_ebml_void(pb, 23);
1586 end_ebml_master(pb, simpletag);
1587 end_ebml_master(pb, tag);
1591 if (mkv->nb_attachments && mkv->mode != MODE_WEBM) {
1592 for (i = 0; i < s->nb_streams; i++) {
1593 const mkv_track *track = &mkv->tracks[i];
1594 const AVStream *st = s->streams[i];
1596 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1599 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1602 ret = mkv_write_tag(mkv, st->metadata, &mkv->tags.bc, NULL,
1603 MATROSKA_ID_TAGTARGETS_ATTACHUID, track->uid);
1610 return end_ebml_master_crc32_tentatively(s->pb, &mkv->tags, mkv,
1616 static int mkv_write_chapters(AVFormatContext *s)
1618 MatroskaMuxContext *mkv = s->priv_data;
1619 AVIOContext *dyn_cp = NULL, *dyn_tags = NULL, **tags, *pb = s->pb;
1620 ebml_master editionentry;
1621 uint64_t chapter_id_offset = 0;
1622 AVRational scale = {1, 1E9};
1625 if (!s->nb_chapters || mkv->wrote_chapters)
1628 for (i = 0; i < s->nb_chapters; i++)
1629 if (!s->chapters[i]->id) {
1630 chapter_id_offset = 1;
1634 ret = start_ebml_master_crc32(&dyn_cp, mkv);
1638 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1639 if (mkv->mode != MODE_WEBM) {
1640 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1641 /* If mkv_write_tags() has already been called, then any tags
1642 * corresponding to chapters will be put into a new Tags element. */
1643 tags = mkv->wrote_tags ? &dyn_tags : &mkv->tags.bc;
1647 for (i = 0; i < s->nb_chapters; i++) {
1648 ebml_master chapteratom, chapterdisplay;
1649 const AVChapter *c = s->chapters[i];
1650 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1651 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1652 const AVDictionaryEntry *t;
1653 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1654 av_log(s, AV_LOG_ERROR,
1655 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1656 chapterstart, chapterend);
1657 ret = AVERROR_INVALIDDATA;
1661 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1662 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID,
1663 (uint32_t)c->id + chapter_id_offset);
1664 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1665 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1666 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1667 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1668 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1669 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1670 end_ebml_master(dyn_cp, chapterdisplay);
1672 end_ebml_master(dyn_cp, chapteratom);
1674 if (tags && mkv_check_tag(c->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID)) {
1675 ret = mkv_write_tag(mkv, c->metadata, tags, NULL,
1676 MATROSKA_ID_TAGTARGETS_CHAPTERUID,
1677 (uint32_t)c->id + chapter_id_offset);
1682 end_ebml_master(dyn_cp, editionentry);
1683 mkv->wrote_chapters = 1;
1685 ret = end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CHAPTERS, 0, 0, 1);
1689 return end_ebml_master_crc32(pb, &dyn_tags, mkv,
1690 MATROSKA_ID_TAGS, 0, 0, 1);
1695 /* tags == &mkv->tags.bc can only happen if mkv->tags.bc was
1696 * initially NULL, so we never free older tags. */
1697 ffio_free_dyn_buf(tags);
1699 ffio_free_dyn_buf(&dyn_cp);
1703 static const char *get_mimetype(const AVStream *st)
1705 const AVDictionaryEntry *t;
1707 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1709 if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
1710 const AVCodecDescriptor *desc = avcodec_descriptor_get(st->codecpar->codec_id);
1711 if (desc && desc->mime_types) {
1712 return desc->mime_types[0];
1713 } else if (st->codecpar->codec_id == AV_CODEC_ID_TEXT)
1714 return "text/plain";
1720 static int mkv_write_attachments(AVFormatContext *s)
1722 MatroskaMuxContext *mkv = s->priv_data;
1723 AVIOContext *dyn_cp = NULL, *pb = s->pb;
1726 if (!mkv->nb_attachments)
1729 ret = start_ebml_master_crc32(&dyn_cp, mkv);
1733 for (i = 0; i < s->nb_streams; i++) {
1734 const AVStream *st = s->streams[i];
1735 mkv_track *track = &mkv->tracks[i];
1736 ebml_master attached_file;
1737 const AVDictionaryEntry *t;
1738 const char *mimetype;
1740 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1743 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1745 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1746 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1747 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1748 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1749 return AVERROR(EINVAL);
1751 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1753 mimetype = get_mimetype(st);
1754 av_assert0(mimetype);
1755 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1756 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1757 put_ebml_uid(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
1758 end_ebml_master(dyn_cp, attached_file);
1760 return end_ebml_master_crc32(pb, &dyn_cp, mkv,
1761 MATROSKA_ID_ATTACHMENTS, 0, 0, 1);
1764 static int64_t get_metadata_duration(AVFormatContext *s)
1766 const AVDictionaryEntry *duration = av_dict_get(s->metadata, "DURATION",
1771 if (duration && (av_parse_time(&us, duration->value, 1) == 0) && us > 0) {
1772 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1776 for (unsigned i = 0; i < s->nb_streams; i++) {
1778 duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1780 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1781 max = FFMAX(max, us);
1784 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1788 static int mkv_write_header(AVFormatContext *s)
1790 MatroskaMuxContext *mkv = s->priv_data;
1791 AVIOContext *pb = s->pb;
1792 ebml_master ebml_header;
1793 const AVDictionaryEntry *tag;
1794 int ret, i, version = 2;
1795 int64_t creation_time;
1797 if (mkv->mode != MODE_WEBM ||
1798 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1799 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1802 for (i = 0; i < s->nb_streams; i++) {
1803 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1804 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1805 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1809 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, MAX_EBML_HEADER_SIZE);
1810 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1811 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1812 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1813 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1814 put_ebml_string(pb, EBML_ID_DOCTYPE , s->oformat->name);
1815 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1816 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION, 2);
1817 end_ebml_master(pb, ebml_header);
1819 put_ebml_id(pb, MATROSKA_ID_SEGMENT);
1820 put_ebml_size_unknown(pb, 8);
1821 mkv->segment_offset = avio_tell(pb);
1823 // We write a SeekHead at the beginning to point to all other level
1824 // one elements (except Clusters).
1825 mkv_start_seekhead(mkv, pb);
1827 ret = start_ebml_master_crc32(&mkv->info.bc, mkv);
1832 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1833 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1834 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1835 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1836 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1837 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1838 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1840 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1842 if (mkv->mode != MODE_WEBM)
1843 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, mkv->segment_uid, 16);
1845 const char *ident = "Lavf";
1846 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1847 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1850 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1851 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1852 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1853 uint8_t date_utc_buf[8];
1854 AV_WB64(date_utc_buf, date_utc);
1855 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1858 // reserve space for the duration
1860 mkv->duration_offset = avio_tell(pb);
1861 if (!mkv->is_live) {
1862 int64_t metadata_duration = get_metadata_duration(s);
1864 if (s->duration > 0) {
1865 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1866 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1867 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1868 } else if (metadata_duration > 0) {
1869 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1870 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1871 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1872 } else if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
1873 put_ebml_void(pb, 11); // assumes double-precision float to be written
1876 ret = end_ebml_master_crc32_tentatively(s->pb, &mkv->info,
1877 mkv, MATROSKA_ID_INFO);
1882 ret = mkv_write_tracks(s);
1886 ret = mkv_write_chapters(s);
1890 if (mkv->mode != MODE_WEBM) {
1891 ret = mkv_write_attachments(s);
1896 /* Must come after mkv_write_chapters() to write chapter tags
1897 * into the same Tags element as the other tags. */
1898 ret = mkv_write_tags(s);
1902 if (!IS_SEEKABLE(pb, mkv)) {
1903 ret = mkv_write_seekhead(pb, mkv, 0, avio_tell(pb));
1908 if (s->metadata_header_padding > 0) {
1909 if (s->metadata_header_padding == 1)
1910 s->metadata_header_padding++;
1911 put_ebml_void(pb, s->metadata_header_padding);
1914 if (mkv->reserve_cues_space) {
1915 if (IS_SEEKABLE(pb, mkv)) {
1916 mkv->cues_pos = avio_tell(pb);
1917 if (mkv->reserve_cues_space == 1)
1918 mkv->reserve_cues_space++;
1919 put_ebml_void(pb, mkv->reserve_cues_space);
1921 mkv->reserve_cues_space = -1;
1924 av_init_packet(&mkv->cur_audio_pkt);
1925 mkv->cur_audio_pkt.size = 0;
1926 mkv->cluster_pos = -1;
1928 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1929 // after 4k and on a keyframe
1930 if (IS_SEEKABLE(pb, mkv)) {
1931 if (mkv->cluster_time_limit < 0)
1932 mkv->cluster_time_limit = 5000;
1933 if (mkv->cluster_size_limit < 0)
1934 mkv->cluster_size_limit = 5 * 1024 * 1024;
1936 if (mkv->cluster_time_limit < 0)
1937 mkv->cluster_time_limit = 1000;
1938 if (mkv->cluster_size_limit < 0)
1939 mkv->cluster_size_limit = 32 * 1024;
1945 static int mkv_blockgroup_size(int pkt_size, int track_num_size)
1947 int size = pkt_size + track_num_size + 3;
1948 size += ebml_length_size(size);
1949 size += 2; // EBML ID for block and block duration
1950 size += 9; // max size of block duration incl. length field
1954 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1961 dst = av_malloc(srclen);
1963 return AVERROR(ENOMEM);
1965 while (srclen >= WV_HEADER_SIZE) {
1968 ret = ff_wv_parse_header(&header, src);
1971 src += WV_HEADER_SIZE;
1972 srclen -= WV_HEADER_SIZE;
1974 if (srclen < header.blocksize) {
1975 ret = AVERROR_INVALIDDATA;
1979 if (header.initial) {
1980 AV_WL32(dst + offset, header.samples);
1983 AV_WL32(dst + offset, header.flags);
1984 AV_WL32(dst + offset + 4, header.crc);
1987 if (!(header.initial && header.final)) {
1988 AV_WL32(dst + offset, header.blocksize);
1992 memcpy(dst + offset, src, header.blocksize);
1993 src += header.blocksize;
1994 srclen -= header.blocksize;
1995 offset += header.blocksize;
2007 static int mkv_write_block(AVFormatContext *s, AVIOContext *pb,
2008 uint32_t blockid, const AVPacket *pkt, int keyframe)
2010 MatroskaMuxContext *mkv = s->priv_data;
2011 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2012 mkv_track *track = &mkv->tracks[pkt->stream_index];
2013 uint8_t *data = NULL, *side_data = NULL;
2014 int err = 0, offset = 0, size = pkt->size, side_data_size;
2015 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2016 uint64_t additional_id;
2017 int64_t discard_padding = 0;
2018 unsigned track_number = track->track_num;
2019 ebml_master block_group, block_additions, block_more;
2021 ts += track->ts_offset;
2023 /* The following string is identical to the one in mkv_write_vtt_blocks
2024 * so that only one copy needs to exist in binaries. */
2025 av_log(s, AV_LOG_DEBUG,
2026 "Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
2027 "duration %" PRId64 " at relative offset %" PRId64 " in cluster "
2028 "at offset %" PRId64 ". TrackNumber %u, keyframe %d\n",
2029 pkt->size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
2030 mkv->cluster_pos, track_number, keyframe != 0);
2032 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
2033 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
2034 err = ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
2035 } else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
2036 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
2037 /* extradata is Annex B, assume the bitstream is too and convert it */
2038 err = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
2039 } else if (par->codec_id == AV_CODEC_ID_AV1) {
2040 err = ff_av1_filter_obus_buf(pkt->data, &data, &size, &offset);
2041 } else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
2042 err = mkv_strip_wavpack(pkt->data, &data, &size);
2047 av_log(s, AV_LOG_ERROR, "Error when reformatting data of "
2048 "a packet from stream %d.\n", pkt->stream_index);
2052 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
2053 /* Matroska specification requires to remove the first QuickTime atom
2059 side_data = av_packet_get_side_data(pkt,
2060 AV_PKT_DATA_SKIP_SAMPLES,
2062 if (side_data && side_data_size >= 10) {
2063 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
2064 (AVRational){1, par->sample_rate},
2065 (AVRational){1, 1000000000});
2068 side_data = av_packet_get_side_data(pkt,
2069 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2072 // Only the Codec-specific BlockMore (id == 1) is currently supported.
2073 if (side_data_size < 8 || (additional_id = AV_RB64(side_data)) != 1) {
2077 side_data_size -= 8;
2081 if (side_data_size || discard_padding) {
2082 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
2083 blockid = MATROSKA_ID_BLOCK;
2086 put_ebml_id(pb, blockid);
2087 put_ebml_length(pb, size + track->track_num_size + 3, 0);
2088 put_ebml_num(pb, track_number, track->track_num_size);
2089 avio_wb16(pb, ts - mkv->cluster_pts);
2090 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
2091 avio_write(pb, data + offset, size);
2092 if (data != pkt->data)
2095 if (blockid == MATROSKA_ID_BLOCK && !keyframe)
2096 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE, track->last_timestamp - ts);
2097 track->last_timestamp = ts;
2099 if (discard_padding)
2100 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
2102 if (side_data_size) {
2103 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2104 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2105 /* Until dbc50f8a our demuxer used a wrong default value
2106 * of BlockAddID, so we write it unconditionally. */
2107 put_ebml_uint (pb, MATROSKA_ID_BLOCKADDID, additional_id);
2108 put_ebml_binary(pb, MATROSKA_ID_BLOCKADDITIONAL,
2109 side_data, side_data_size);
2110 end_ebml_master(pb, block_more);
2111 end_ebml_master(pb, block_additions);
2113 if (side_data_size || discard_padding)
2114 end_ebml_master(pb, block_group);
2119 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, const AVPacket *pkt)
2121 MatroskaMuxContext *mkv = s->priv_data;
2122 mkv_track *track = &mkv->tracks[pkt->stream_index];
2123 ebml_master blockgroup;
2124 int id_size, settings_size, size;
2125 const char *id, *settings;
2126 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2127 const int flags = 0;
2129 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2133 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2135 settings = settings ? settings : "";
2137 size = id_size + 1 + settings_size + 1 + pkt->size;
2139 /* The following string is identical to the one in mkv_write_block so that
2140 * only one copy needs to exist in binaries. */
2141 av_log(s, AV_LOG_DEBUG,
2142 "Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
2143 "duration %" PRId64 " at relative offset %" PRId64 " in cluster "
2144 "at offset %" PRId64 ". TrackNumber %u, keyframe %d\n",
2145 size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
2146 mkv->cluster_pos, track->track_num, 1);
2148 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2149 mkv_blockgroup_size(size, track->track_num_size));
2151 put_ebml_id(pb, MATROSKA_ID_BLOCK);
2152 put_ebml_length(pb, size + track->track_num_size + 3, 0);
2153 put_ebml_num(pb, track->track_num, track->track_num_size);
2154 avio_wb16(pb, ts - mkv->cluster_pts);
2156 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2158 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2159 end_ebml_master(pb, blockgroup);
2161 return pkt->duration;
2164 static int mkv_end_cluster(AVFormatContext *s)
2166 MatroskaMuxContext *mkv = s->priv_data;
2169 if (!mkv->have_video) {
2170 for (unsigned i = 0; i < s->nb_streams; i++)
2171 mkv->tracks[i].has_cue = 0;
2173 mkv->cluster_pos = -1;
2174 ret = end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv,
2175 MATROSKA_ID_CLUSTER, 0, 1, 0);
2179 avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
2183 static int mkv_check_new_extra_data(AVFormatContext *s, const AVPacket *pkt)
2185 MatroskaMuxContext *mkv = s->priv_data;
2186 mkv_track *track = &mkv->tracks[pkt->stream_index];
2187 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2189 int side_data_size, ret;
2191 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
2194 switch (par->codec_id) {
2195 case AV_CODEC_ID_AAC:
2196 if (side_data_size && mkv->track.bc) {
2197 int filler, output_sample_rate = 0;
2198 ret = get_aac_sample_rates(s, mkv, side_data, side_data_size,
2199 &track->sample_rate, &output_sample_rate);
2202 if (!output_sample_rate)
2203 output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
2204 ret = ff_alloc_extradata(par, side_data_size);
2207 memcpy(par->extradata, side_data, side_data_size);
2208 avio_seek(mkv->track.bc, track->codecpriv_offset, SEEK_SET);
2209 mkv_write_codecprivate(s, mkv->track.bc, par, 1, 0);
2210 filler = MAX_PCE_SIZE + 2 + 4 - (avio_tell(mkv->track.bc) - track->codecpriv_offset);
2212 put_ebml_void(mkv->track.bc, filler);
2213 avio_seek(mkv->track.bc, track->sample_rate_offset, SEEK_SET);
2214 put_ebml_float(mkv->track.bc, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
2215 put_ebml_float(mkv->track.bc, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
2216 } else if (!par->extradata_size && !track->sample_rate) {
2217 // No extradata (codecpar or packet side data).
2218 av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
2219 return AVERROR(EINVAL);
2222 case AV_CODEC_ID_FLAC:
2223 if (side_data_size && mkv->track.bc) {
2224 uint8_t *old_extradata = par->extradata;
2225 if (side_data_size != par->extradata_size) {
2226 av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
2228 return AVERROR(EINVAL);
2230 par->extradata = side_data;
2231 avio_seek(mkv->track.bc, track->codecpriv_offset, SEEK_SET);
2232 mkv_write_codecprivate(s, mkv->track.bc, par, 1, 0);
2233 par->extradata = old_extradata;
2236 // FIXME: Remove the following once libaom starts propagating extradata during init()
2237 // See https://bugs.chromium.org/p/aomedia/issues/detail?id=2012
2238 case AV_CODEC_ID_AV1:
2239 if (side_data_size && mkv->track.bc && !par->extradata_size) {
2240 AVIOContext *dyn_cp;
2243 ret = avio_open_dyn_buf(&dyn_cp);
2246 ff_isom_write_av1c(dyn_cp, side_data, side_data_size);
2247 codecpriv_size = avio_get_dyn_buf(dyn_cp, &codecpriv);
2248 if ((ret = dyn_cp->error) < 0 ||
2249 !codecpriv_size && (ret = AVERROR_INVALIDDATA)) {
2250 ffio_free_dyn_buf(&dyn_cp);
2253 avio_seek(mkv->track.bc, track->codecpriv_offset, SEEK_SET);
2254 // Do not write the OBUs as we don't have space saved for them
2255 put_ebml_binary(mkv->track.bc, MATROSKA_ID_CODECPRIVATE, codecpriv, 4);
2256 ffio_free_dyn_buf(&dyn_cp);
2257 ret = ff_alloc_extradata(par, side_data_size);
2260 memcpy(par->extradata, side_data, side_data_size);
2261 } else if (!par->extradata_size)
2262 return AVERROR_INVALIDDATA;
2266 av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
2273 static int mkv_write_packet_internal(AVFormatContext *s, const AVPacket *pkt)
2275 MatroskaMuxContext *mkv = s->priv_data;
2277 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2278 mkv_track *track = &mkv->tracks[pkt->stream_index];
2279 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2280 int duration = pkt->duration;
2282 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2283 int64_t relative_packet_pos;
2285 if (ts == AV_NOPTS_VALUE) {
2286 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2287 return AVERROR(EINVAL);
2289 ts += track->ts_offset;
2291 if (mkv->cluster_pos != -1) {
2292 int64_t cluster_time = ts - mkv->cluster_pts;
2293 if ((int16_t)cluster_time != cluster_time) {
2294 ret = mkv_end_cluster(s);
2297 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2301 if (mkv->cluster_pos == -1) {
2302 ret = start_ebml_master_crc32(&mkv->cluster_bc, mkv);
2305 mkv->cluster_pos = avio_tell(s->pb);
2306 put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2307 mkv->cluster_pts = FFMAX(0, ts);
2308 av_log(s, AV_LOG_DEBUG,
2309 "Starting new cluster with timestamp "
2310 "%" PRId64 " at offset %" PRId64 " bytes\n",
2311 mkv->cluster_pts, mkv->cluster_pos);
2313 pb = mkv->cluster_bc;
2315 relative_packet_pos = avio_tell(pb);
2317 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2318 ret = mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2321 if (keyframe && IS_SEEKABLE(s->pb, mkv) &&
2322 (par->codec_type == AVMEDIA_TYPE_VIDEO || !mkv->have_video && !track->has_cue)) {
2323 ret = mkv_add_cuepoint(mkv, pkt->stream_index, ts,
2324 mkv->cluster_pos, relative_packet_pos, -1);
2330 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2331 duration = mkv_write_vtt_blocks(s, pb, pkt);
2333 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2334 mkv_blockgroup_size(pkt->size,
2335 track->track_num_size));
2337 #if FF_API_CONVERGENCE_DURATION
2338 FF_DISABLE_DEPRECATION_WARNINGS
2339 /* For backward compatibility, prefer convergence_duration. */
2340 if (pkt->convergence_duration > 0) {
2341 duration = pkt->convergence_duration;
2343 FF_ENABLE_DEPRECATION_WARNINGS
2345 /* All subtitle blocks are considered to be keyframes. */
2346 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2347 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2348 end_ebml_master(pb, blockgroup);
2351 if (IS_SEEKABLE(s->pb, mkv)) {
2352 ret = mkv_add_cuepoint(mkv, pkt->stream_index, ts,
2353 mkv->cluster_pos, relative_packet_pos, duration);
2359 mkv->duration = FFMAX(mkv->duration, ts + duration);
2360 track->duration = FFMAX(track->duration, ts + duration);
2365 static int mkv_write_packet(AVFormatContext *s, const AVPacket *pkt)
2367 MatroskaMuxContext *mkv = s->priv_data;
2368 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2369 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2371 int64_t cluster_time;
2373 int start_new_cluster;
2375 ret = mkv_check_new_extra_data(s, pkt);
2379 if (mkv->cluster_pos != -1) {
2380 if (mkv->tracks[pkt->stream_index].write_dts)
2381 cluster_time = pkt->dts - mkv->cluster_pts;
2383 cluster_time = pkt->pts - mkv->cluster_pts;
2384 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2386 cluster_size = avio_tell(mkv->cluster_bc);
2388 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2389 // WebM DASH specification states that the first block of
2390 // every Cluster has to be a key frame. So for DASH video,
2391 // we only create a Cluster on seeing key frames.
2392 start_new_cluster = keyframe;
2393 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2394 cluster_time > mkv->cluster_time_limit) {
2395 // For DASH audio, we create a Cluster based on cluster_time_limit.
2396 start_new_cluster = 1;
2397 } else if (!mkv->is_dash &&
2398 (cluster_size > mkv->cluster_size_limit ||
2399 cluster_time > mkv->cluster_time_limit ||
2400 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2401 cluster_size > 4 * 1024))) {
2402 start_new_cluster = 1;
2404 start_new_cluster = 0;
2406 if (start_new_cluster) {
2407 ret = mkv_end_cluster(s);
2413 if (!mkv->cluster_pos)
2414 avio_write_marker(s->pb,
2415 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2416 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2418 // check if we have an audio packet cached
2419 if (mkv->cur_audio_pkt.size > 0) {
2420 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
2421 av_packet_unref(&mkv->cur_audio_pkt);
2423 av_log(s, AV_LOG_ERROR,
2424 "Could not write cached audio packet ret:%d\n", ret);
2429 // buffer an audio packet to ensure the packet containing the video
2430 // keyframe's timecode is contained in the same cluster for WebM
2431 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2433 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2435 ret = mkv_write_packet_internal(s, pkt);
2439 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2441 MatroskaMuxContext *mkv = s->priv_data;
2444 if (mkv->cluster_pos != -1) {
2445 int ret = mkv_end_cluster(s);
2448 av_log(s, AV_LOG_DEBUG,
2449 "Flushing cluster at offset %" PRIu64 " bytes\n",
2454 return mkv_write_packet(s, pkt);
2457 static int mkv_write_trailer(AVFormatContext *s)
2459 MatroskaMuxContext *mkv = s->priv_data;
2460 AVIOContext *pb = s->pb;
2461 int64_t endpos, ret64;
2464 // check if we have an audio packet cached
2465 if (mkv->cur_audio_pkt.size > 0) {
2466 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
2468 av_log(s, AV_LOG_ERROR,
2469 "Could not write cached audio packet ret:%d\n", ret);
2474 if (mkv->cluster_pos != -1) {
2475 ret = end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv,
2476 MATROSKA_ID_CLUSTER, 0, 0, 0);
2481 ret = mkv_write_chapters(s);
2485 if (!IS_SEEKABLE(pb, mkv))
2488 endpos = avio_tell(pb);
2490 if (mkv->cues.num_entries && mkv->reserve_cues_space >= 0) {
2491 AVIOContext *cues = NULL;
2493 int length_size = 0;
2495 ret = start_ebml_master_crc32(&cues, mkv);
2499 ret = mkv_assemble_cues(s->streams, cues, &mkv->cues,
2500 mkv->tracks, s->nb_streams);
2502 ffio_free_dyn_buf(&cues);
2506 if (mkv->reserve_cues_space) {
2507 size = avio_tell(cues);
2508 length_size = ebml_length_size(size);
2509 size += 4 + length_size;
2510 if (mkv->reserve_cues_space < size) {
2511 av_log(s, AV_LOG_WARNING,
2512 "Insufficient space reserved for Cues: "
2513 "%d < %"PRIu64". No Cues will be output.\n",
2514 mkv->reserve_cues_space, size);
2515 ret2 = AVERROR(EINVAL);
2518 if ((ret64 = avio_seek(pb, mkv->cues_pos, SEEK_SET)) < 0) {
2519 ffio_free_dyn_buf(&cues);
2522 if (mkv->reserve_cues_space == size + 1) {
2523 /* There is no way to reserve a single byte because
2524 * the minimal size of an EBML Void element is 2
2525 * (1 byte ID, 1 byte length field). This problem
2526 * is solved by writing the Cues' length field on
2527 * one byte more than necessary. */
2533 ret = end_ebml_master_crc32(pb, &cues, mkv, MATROSKA_ID_CUES,
2537 if (mkv->reserve_cues_space) {
2538 if (size < mkv->reserve_cues_space)
2539 put_ebml_void(pb, mkv->reserve_cues_space - size);
2541 endpos = avio_tell(pb);
2545 /* Lengths greater than (1ULL << 56) - 1 can't be represented
2546 * via an EBML number, so leave the unknown length field. */
2547 if (endpos - mkv->segment_offset < (1ULL << 56) - 1) {
2548 if ((ret64 = avio_seek(pb, mkv->segment_offset - 8, SEEK_SET)) < 0)
2550 put_ebml_length(pb, endpos - mkv->segment_offset, 8);
2553 ret = mkv_write_seekhead(pb, mkv, 1, mkv->info.pos);
2558 // update the duration
2559 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2560 avio_seek(mkv->info.bc, mkv->duration_offset, SEEK_SET);
2561 put_ebml_float(mkv->info.bc, MATROSKA_ID_DURATION, mkv->duration);
2562 ret = end_ebml_master_crc32(pb, &mkv->info.bc, mkv,
2563 MATROSKA_ID_INFO, 0, 0, 0);
2568 if (mkv->track.bc) {
2569 // write Tracks master
2570 avio_seek(pb, mkv->track.pos, SEEK_SET);
2571 ret = end_ebml_master_crc32(pb, &mkv->track.bc, mkv,
2572 MATROSKA_ID_TRACKS, 0, 0, 0);
2577 // update stream durations
2580 for (i = 0; i < s->nb_streams; ++i) {
2581 const AVStream *st = s->streams[i];
2582 const mkv_track *track = &mkv->tracks[i];
2584 if (track->duration_offset > 0) {
2585 double duration_sec = track->duration * av_q2d(st->time_base);
2586 char duration_string[20] = "";
2588 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2591 avio_seek(mkv->tags.bc, track->duration_offset, SEEK_SET);
2593 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2594 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2595 fmod(duration_sec, 60));
2597 put_ebml_binary(mkv->tags.bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2601 avio_seek(pb, mkv->tags.pos, SEEK_SET);
2602 ret = end_ebml_master_crc32(pb, &mkv->tags.bc, mkv,
2603 MATROSKA_ID_TAGS, 0, 0, 0);
2608 avio_seek(pb, endpos, SEEK_SET);
2613 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2616 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2617 if (ff_mkv_codec_tags[i].id == codec_id)
2620 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2621 enum AVMediaType type = avcodec_get_type(codec_id);
2622 // mkv theoretically supports any video/audio through VFW/ACM
2623 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2630 static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
2633 for (i = 0; ff_webm_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2634 if (ff_webm_codec_tags[i].id == codec_id)
2640 static uint64_t mkv_get_uid(const mkv_track *tracks, int i, AVLFG *c)
2645 uid = (uint64_t)av_lfg_get(c) << 32;
2646 uid |= av_lfg_get(c);
2649 for (k = 0; k < i; k++) {
2650 if (tracks[k].uid == uid)
2658 static int mkv_init(struct AVFormatContext *s)
2660 MatroskaMuxContext *mkv = s->priv_data;
2662 unsigned nb_tracks = 0;
2665 for (i = 0; i < s->nb_streams; i++) {
2666 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
2667 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
2668 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
2669 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
2670 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
2671 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
2672 av_log(s, AV_LOG_ERROR,
2673 "The Matroska muxer does not yet support muxing %s\n",
2674 avcodec_get_name(s->streams[i]->codecpar->codec_id));
2675 return AVERROR_PATCHWELCOME;
2679 if (s->avoid_negative_ts < 0) {
2680 s->avoid_negative_ts = 1;
2681 s->internal->avoid_negative_ts_use_pts = 1;
2684 if (!strcmp(s->oformat->name, "webm")) {
2685 mkv->mode = MODE_WEBM;
2688 mkv->mode = MODE_MATROSKAv2;
2690 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
2692 return AVERROR(ENOMEM);
2694 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
2695 av_lfg_init(&c, av_get_random_seed());
2697 // Calculate the SegmentUID now in order not to waste our random seed.
2698 for (i = 0; i < 4; i++)
2699 mkv->segment_uid[i] = av_lfg_get(&c);
2702 for (i = 0; i < s->nb_streams; i++) {
2703 AVStream *st = s->streams[i];
2704 mkv_track *track = &mkv->tracks[i];
2706 if (s->flags & AVFMT_FLAG_BITEXACT) {
2709 track->uid = mkv_get_uid(mkv->tracks, i, &c);
2712 // ms precision is the de-facto standard timescale for mkv files
2713 avpriv_set_pts_info(st, 64, 1, 1000);
2715 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
2716 if (mkv->mode == MODE_WEBM) {
2717 av_log(s, AV_LOG_WARNING, "Stream %d will be ignored "
2718 "as WebM doesn't support attachments.\n", i);
2719 } else if (!get_mimetype(st)) {
2720 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype "
2721 "tag and it cannot be deduced from the codec id.\n", i);
2722 return AVERROR(EINVAL);
2724 mkv->nb_attachments++;
2729 track->track_num = mkv->is_dash ? mkv->dash_track_number : nb_tracks;
2730 track->track_num_size = ebml_num_size(track->track_num);
2733 if (mkv->is_dash && nb_tracks != 1)
2734 return AVERROR(EINVAL);
2739 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2742 AVStream *st = s->streams[pkt->stream_index];
2744 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2745 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2746 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2747 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2748 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2754 static const AVCodecTag additional_audio_tags[] = {
2755 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2756 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2757 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2758 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2759 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2760 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2761 { AV_CODEC_ID_QDMC, 0xFFFFFFFF },
2762 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2763 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2764 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2765 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2766 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2767 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2770 static const AVCodecTag additional_video_tags[] = {
2771 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2772 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2773 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2774 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2777 static const AVCodecTag additional_subtitle_tags[] = {
2778 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2779 { AV_CODEC_ID_DVD_SUBTITLE, 0xFFFFFFFF },
2780 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2781 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2784 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2785 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2786 static const AVOption options[] = {
2787 { "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 },
2788 { "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 },
2789 { "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 },
2790 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2791 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
2792 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2793 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2794 { "flipped_raw_rgb", "Raw RGB bitmaps in VFW mode are stored bottom-up", OFFSET(flipped_raw_rgb), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2795 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2796 { "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" },
2797 { "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" },
2798 { "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" },
2799 { "passthrough", "Use the disposition flag as-is", 0, AV_OPT_TYPE_CONST, { .i64 = DEFAULT_MODE_PASSTHROUGH }, 0, 0, FLAGS, "default_mode" },
2803 #if CONFIG_MATROSKA_MUXER
2804 static const AVClass matroska_class = {
2805 .class_name = "matroska muxer",
2806 .item_name = av_default_item_name,
2808 .version = LIBAVUTIL_VERSION_INT,
2811 AVOutputFormat ff_matroska_muxer = {
2813 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2814 .mime_type = "video/x-matroska",
2815 .extensions = "mkv",
2816 .priv_data_size = sizeof(MatroskaMuxContext),
2817 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2818 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2819 .video_codec = CONFIG_LIBX264_ENCODER ?
2820 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2822 .deinit = mkv_deinit,
2823 .write_header = mkv_write_header,
2824 .write_packet = mkv_write_flush_packet,
2825 .write_trailer = mkv_write_trailer,
2826 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2827 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2828 .codec_tag = (const AVCodecTag* const []){
2829 ff_codec_bmp_tags, ff_codec_wav_tags,
2830 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2832 .subtitle_codec = AV_CODEC_ID_ASS,
2833 .query_codec = mkv_query_codec,
2834 .check_bitstream = mkv_check_bitstream,
2835 .priv_class = &matroska_class,
2839 #if CONFIG_WEBM_MUXER
2840 static const AVClass webm_class = {
2841 .class_name = "webm muxer",
2842 .item_name = av_default_item_name,
2844 .version = LIBAVUTIL_VERSION_INT,
2847 AVOutputFormat ff_webm_muxer = {
2849 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2850 .mime_type = "video/webm",
2851 .extensions = "webm",
2852 .priv_data_size = sizeof(MatroskaMuxContext),
2853 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2854 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2855 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2857 .deinit = mkv_deinit,
2858 .write_header = mkv_write_header,
2859 .write_packet = mkv_write_flush_packet,
2860 .write_trailer = mkv_write_trailer,
2861 .query_codec = webm_query_codec,
2862 .check_bitstream = mkv_check_bitstream,
2863 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2864 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2865 .priv_class = &webm_class,
2869 #if CONFIG_MATROSKA_AUDIO_MUXER
2870 static const AVClass mka_class = {
2871 .class_name = "matroska audio muxer",
2872 .item_name = av_default_item_name,
2874 .version = LIBAVUTIL_VERSION_INT,
2876 AVOutputFormat ff_matroska_audio_muxer = {
2878 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2879 .mime_type = "audio/x-matroska",
2880 .extensions = "mka",
2881 .priv_data_size = sizeof(MatroskaMuxContext),
2882 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2883 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2884 .video_codec = AV_CODEC_ID_NONE,
2886 .deinit = mkv_deinit,
2887 .write_header = mkv_write_header,
2888 .write_packet = mkv_write_flush_packet,
2889 .write_trailer = mkv_write_trailer,
2890 .check_bitstream = mkv_check_bitstream,
2891 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2893 .codec_tag = (const AVCodecTag* const []){
2894 ff_codec_wav_tags, additional_audio_tags, 0
2896 .priv_class = &mka_class,