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/sha.h"
53 #include "libavutil/stereo3d.h"
55 #include "libavcodec/xiph.h"
56 #include "libavcodec/mpeg4audio.h"
58 /* Level 1 elements we create a SeekHead entry for:
59 * Info, Tracks, Chapters, Attachments, Tags and Cues */
60 #define MAX_SEEKHEAD_ENTRIES 6
62 typedef struct ebml_master {
63 int64_t pos; ///< absolute offset in the containing AVIOContext where the master's elements start
64 int sizebytes; ///< how many bytes were reserved for the size
67 typedef struct mkv_seekhead_entry {
72 typedef struct mkv_seekhead {
74 mkv_seekhead_entry entries[MAX_SEEKHEAD_ENTRIES];
79 typedef struct mkv_cuepoint {
83 int64_t cluster_pos; ///< offset of the cluster containing the block relative to the segment
84 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
85 int64_t duration; ///< duration of the block according to time base
88 typedef struct mkv_cues {
89 mkv_cuepoint *entries;
93 typedef struct mkv_track {
97 int64_t sample_rate_offset;
98 int64_t last_timestamp;
100 int64_t duration_offset;
101 int64_t codecpriv_offset;
105 typedef struct mkv_attachment {
110 typedef struct mkv_attachments {
111 mkv_attachment *entries;
115 #define MODE_MATROSKAv2 0x01
116 #define MODE_WEBM 0x02
118 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
119 * range 1 to 126 (inclusive) */
120 #define MAX_TRACKS 126
122 typedef struct MatroskaMuxContext {
123 const AVClass *class;
125 AVIOContext *tags_bc;
127 AVIOContext *info_bc;
129 AVIOContext *tracks_bc;
132 int64_t segment_offset;
133 AVIOContext *cluster_bc;
134 int64_t cluster_pos; ///< file offset of the current cluster
136 int64_t duration_offset;
138 mkv_seekhead seekhead;
141 mkv_attachments *attachments;
143 AVPacket cur_audio_pkt;
145 int have_attachments;
148 int reserve_cues_space;
149 int cluster_size_limit;
151 int64_t cluster_time_limit;
153 int dash_track_number;
157 uint32_t chapter_id_offset;
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 * Calculate how many bytes are needed to represent a given number in EBML.
204 static int ebml_num_size(uint64_t num)
207 while ((num + 1) >> bytes * 7)
213 * Write a number in EBML variable length format.
215 * @param bytes The number of bytes that need to be used to write the number.
216 * If zero, the minimal number of bytes will be used.
218 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
220 int i, needed_bytes = ebml_num_size(num);
222 // sizes larger than this are currently undefined in EBML
223 av_assert0(num < (1ULL << 56) - 1);
226 bytes = needed_bytes;
227 // The bytes needed to write the given size must not exceed
228 // the bytes that we ought to use.
229 av_assert0(bytes >= needed_bytes);
231 num |= 1ULL << bytes * 7;
232 for (i = bytes - 1; i >= 0; i--)
233 avio_w8(pb, (uint8_t)(num >> i * 8));
236 static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
243 put_ebml_id(pb, elementid);
244 put_ebml_num(pb, bytes, 0);
245 for (i = bytes - 1; i >= 0; i--)
246 avio_w8(pb, (uint8_t)(val >> i * 8));
249 static void put_ebml_sint(AVIOContext *pb, uint32_t elementid, int64_t val)
252 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
254 while (tmp>>=8) bytes++;
256 put_ebml_id(pb, elementid);
257 put_ebml_num(pb, bytes, 0);
258 for (i = bytes - 1; i >= 0; i--)
259 avio_w8(pb, (uint8_t)(val >> i * 8));
262 static void put_ebml_float(AVIOContext *pb, uint32_t elementid, double val)
264 put_ebml_id(pb, elementid);
265 put_ebml_num(pb, 8, 0);
266 avio_wb64(pb, av_double2int(val));
269 static void put_ebml_binary(AVIOContext *pb, uint32_t elementid,
270 const void *buf, int size)
272 put_ebml_id(pb, elementid);
273 put_ebml_num(pb, size, 0);
274 avio_write(pb, buf, size);
277 static void put_ebml_string(AVIOContext *pb, uint32_t elementid,
280 put_ebml_binary(pb, elementid, str, strlen(str));
284 * Write a void element of a given size. Useful for reserving space in
285 * the file to be written to later.
287 * @param size The number of bytes to reserve, which must be at least 2.
289 static void put_ebml_void(AVIOContext *pb, int size)
291 av_assert0(size >= 2);
293 put_ebml_id(pb, EBML_ID_VOID);
294 // we need to subtract the length needed to store the size from the
295 // size we need to reserve so 2 cases, we use 8 bytes to store the
296 // size if possible, 1 byte otherwise
299 put_ebml_num(pb, size, 0);
302 put_ebml_num(pb, size, 8);
304 ffio_fill(pb, 0, size);
307 static ebml_master start_ebml_master(AVIOContext *pb, uint32_t elementid,
308 uint64_t expectedsize)
310 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
312 put_ebml_id(pb, elementid);
313 put_ebml_size_unknown(pb, bytes);
314 return (ebml_master) { avio_tell(pb), bytes };
317 static void end_ebml_master(AVIOContext *pb, ebml_master master)
319 int64_t pos = avio_tell(pb);
321 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
323 put_ebml_num(pb, pos - master.pos, master.sizebytes);
324 avio_seek(pb, pos, SEEK_SET);
327 static int start_ebml_master_crc32(AVIOContext **dyn_cp, MatroskaMuxContext *mkv)
331 if (!*dyn_cp && (ret = avio_open_dyn_buf(dyn_cp)) < 0)
335 put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
340 static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp,
341 MatroskaMuxContext *mkv, uint32_t id,
342 int length_size, int keep_buffer)
344 uint8_t *buf, crc[4];
348 size = avio_get_dyn_buf(*dyn_cp, &buf);
349 put_ebml_num(pb, size, length_size);
350 if (mkv->write_crc) {
351 skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
352 AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
353 put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
355 avio_write(pb, buf + skip, size - skip);
358 ffio_reset_dyn_buf(*dyn_cp);
360 ffio_free_dyn_buf(dyn_cp);
365 * Complete ebml master without destroying the buffer, allowing for later updates
367 static void end_ebml_master_crc32_preliminary(AVIOContext *pb, AVIOContext *dyn_cp,
368 uint32_t id, int64_t *pos)
371 int size = avio_get_dyn_buf(dyn_cp, &buf);
373 *pos = avio_tell(pb);
376 put_ebml_num(pb, size, 0);
377 avio_write(pb, buf, size);
380 static void put_xiph_size(AVIOContext *pb, int size)
382 ffio_fill(pb, 255, size / 255);
383 avio_w8(pb, size % 255);
387 * Free the members allocated in the mux context.
389 static void mkv_deinit(AVFormatContext *s)
391 MatroskaMuxContext *mkv = s->priv_data;
393 av_packet_unref(&mkv->cur_audio_pkt);
395 ffio_free_dyn_buf(&mkv->cluster_bc);
396 ffio_free_dyn_buf(&mkv->info_bc);
397 ffio_free_dyn_buf(&mkv->tracks_bc);
398 ffio_free_dyn_buf(&mkv->tags_bc);
400 av_freep(&mkv->cues.entries);
401 if (mkv->attachments) {
402 av_freep(&mkv->attachments->entries);
403 av_freep(&mkv->attachments);
405 av_freep(&mkv->tracks);
409 * Initialize the SeekHead element to be ready to index level 1 Matroska
410 * elements. Enough space to write MAX_SEEKHEAD_ENTRIES SeekHead entries
411 * will be reserved at the current file location.
413 static void mkv_start_seekhead(MatroskaMuxContext *mkv, AVIOContext *pb)
415 mkv->seekhead.filepos = avio_tell(pb);
416 // 21 bytes max for a Seek entry, 6 bytes max for the SeekHead ID
417 // and size, 6 bytes for a CRC32 element, and 2 bytes to guarantee
418 // that an EBML void element will fit afterwards
419 mkv->seekhead.reserved_size = MAX_SEEKHEAD_ENTRIES * MAX_SEEKENTRY_SIZE + 14;
420 put_ebml_void(pb, mkv->seekhead.reserved_size);
423 static void mkv_add_seekhead_entry(MatroskaMuxContext *mkv, uint32_t elementid,
426 mkv_seekhead *seekhead = &mkv->seekhead;
428 av_assert1(seekhead->num_entries < MAX_SEEKHEAD_ENTRIES);
430 seekhead->entries[seekhead->num_entries].elementid = elementid;
431 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - mkv->segment_offset;
435 * Write the SeekHead to the file at the location reserved for it
436 * and seek to destpos afterwards. When error_on_seek_failure
437 * is not set, failure to seek to the position designated for the
438 * SeekHead is not considered an error and it is presumed that
439 * destpos is the current position; failure to seek to destpos
440 * afterwards is always an error.
442 * @return 0 on success, < 0 on error.
444 static int mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv,
445 int error_on_seek_failure, int64_t destpos)
447 AVIOContext *dyn_cp = NULL;
448 mkv_seekhead *seekhead = &mkv->seekhead;
449 int64_t remaining, ret64;
452 if ((ret64 = avio_seek(pb, seekhead->filepos, SEEK_SET)) < 0)
453 return error_on_seek_failure ? ret64 : 0;
455 ret = start_ebml_master_crc32(&dyn_cp, mkv);
459 for (i = 0; i < seekhead->num_entries; i++) {
460 mkv_seekhead_entry *entry = &seekhead->entries[i];
461 ebml_master seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY,
464 put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
465 put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
466 put_ebml_id(dyn_cp, entry->elementid);
468 put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
469 end_ebml_master(dyn_cp, seekentry);
471 end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_SEEKHEAD, 0, 0);
473 remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
474 put_ebml_void(pb, remaining);
476 if ((ret64 = avio_seek(pb, destpos, SEEK_SET)) < 0)
482 static int mkv_add_cuepoint(MatroskaMuxContext *mkv, int stream, int tracknum, int64_t ts,
483 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
485 mkv_cues *cues = &mkv->cues;
486 mkv_cuepoint *entries = cues->entries;
491 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
493 return AVERROR(ENOMEM);
494 cues->entries = entries;
496 cues->entries[cues->num_entries].pts = ts;
497 cues->entries[cues->num_entries].stream_idx = stream;
498 cues->entries[cues->num_entries].tracknum = tracknum;
499 cues->entries[cues->num_entries].cluster_pos = cluster_pos - mkv->segment_offset;
500 cues->entries[cues->num_entries].relative_pos = relative_pos;
501 cues->entries[cues->num_entries++].duration = duration;
506 static int mkv_assemble_cues(AVStream **streams, AVIOContext *dyn_cp,
507 mkv_cues *cues, mkv_track *tracks, int num_tracks)
509 AVIOContext *cuepoint;
512 ret = avio_open_dyn_buf(&cuepoint);
516 for (mkv_cuepoint *entry = cues->entries, *end = entry + cues->num_entries;
518 uint64_t pts = entry->pts;
522 put_ebml_uint(cuepoint, MATROSKA_ID_CUETIME, pts);
524 // put all the entries from different tracks that have the exact same
525 // timestamp into the same CuePoint
526 for (int j = 0; j < num_tracks; j++)
527 tracks[j].has_cue = 0;
529 ebml_master track_positions;
530 int idx = entry->stream_idx;
532 av_assert0(idx >= 0 && idx < num_tracks);
533 if (tracks[idx].has_cue && streams[idx]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
535 tracks[idx].has_cue = 1;
536 track_positions = start_ebml_master(cuepoint, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
537 put_ebml_uint(cuepoint, MATROSKA_ID_CUETRACK , entry->tracknum );
538 put_ebml_uint(cuepoint, MATROSKA_ID_CUECLUSTERPOSITION , entry->cluster_pos);
539 put_ebml_uint(cuepoint, MATROSKA_ID_CUERELATIVEPOSITION, entry->relative_pos);
540 if (entry->duration != -1)
541 put_ebml_uint(cuepoint, MATROSKA_ID_CUEDURATION , entry->duration);
542 end_ebml_master(cuepoint, track_positions);
543 } while (++entry < end && entry->pts == pts);
544 size = avio_get_dyn_buf(cuepoint, &buf);
545 put_ebml_binary(dyn_cp, MATROSKA_ID_POINTENTRY, buf, size);
546 ffio_reset_dyn_buf(cuepoint);
548 ffio_free_dyn_buf(&cuepoint);
553 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
555 const uint8_t *header_start[3];
557 int first_header_size;
560 if (par->codec_id == AV_CODEC_ID_VORBIS)
561 first_header_size = 30;
563 first_header_size = 42;
565 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
566 first_header_size, header_start, header_len) < 0) {
567 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
571 avio_w8(pb, 2); // number packets - 1
572 for (j = 0; j < 2; j++) {
573 put_xiph_size(pb, header_len[j]);
575 for (j = 0; j < 3; j++)
576 avio_write(pb, header_start[j], header_len[j]);
581 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
583 if (par->extradata && par->extradata_size == 2)
584 avio_write(pb, par->extradata, 2);
586 avio_wl16(pb, 0x410); // fallback to the most recent version
590 static int put_flac_codecpriv(AVFormatContext *s,
591 AVIOContext *pb, AVCodecParameters *par)
593 int write_comment = (par->channel_layout &&
594 !(par->channel_layout & ~0x3ffffULL) &&
595 !ff_flac_is_native_layout(par->channel_layout));
596 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
603 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
604 "Lavf" : LIBAVFORMAT_IDENT;
605 AVDictionary *dict = NULL;
606 uint8_t buf[32], *data, *p;
609 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
610 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
612 len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
613 if (len >= ((1<<24) - 4)) {
615 return AVERROR(EINVAL);
618 data = av_malloc(len + 4);
621 return AVERROR(ENOMEM);
625 AV_WB24(data + 1, len);
628 ff_vorbiscomment_write(&p, &dict, vendor, NULL, 0);
630 avio_write(pb, data, len + 4);
639 static int get_aac_sample_rates(AVFormatContext *s, uint8_t *extradata, int extradata_size,
640 int *sample_rate, int *output_sample_rate)
642 MPEG4AudioConfig mp4ac;
645 ret = avpriv_mpeg4audio_get_config2(&mp4ac, extradata, extradata_size, 1, s);
646 /* Don't abort if the failure is because of missing extradata. Assume in that
647 * case a bitstream filter will provide the muxer with the extradata in the
649 * Abort however if s->pb is not seekable, as we would not be able to seek back
650 * to write the sample rate elements once the extradata shows up, anyway. */
651 if (ret < 0 && (extradata_size || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL))) {
652 av_log(s, AV_LOG_ERROR,
653 "Error parsing AAC extradata, unable to determine samplerate.\n");
654 return AVERROR(EINVAL);
658 /* This will only happen when this function is called while writing the
659 * header and no extradata is available. The space for this element has
660 * to be reserved for when this function is called again after the
661 * extradata shows up in the first packet, as there's no way to know if
662 * output_sample_rate will be different than sample_rate or not. */
663 *output_sample_rate = *sample_rate;
665 *sample_rate = mp4ac.sample_rate;
666 *output_sample_rate = mp4ac.ext_sample_rate;
671 static int mkv_write_native_codecprivate(AVFormatContext *s, AVIOContext *pb,
672 AVCodecParameters *par,
675 switch (par->codec_id) {
676 case AV_CODEC_ID_VORBIS:
677 case AV_CODEC_ID_THEORA:
678 return put_xiph_codecpriv(s, dyn_cp, par);
679 case AV_CODEC_ID_FLAC:
680 return put_flac_codecpriv(s, dyn_cp, par);
681 case AV_CODEC_ID_WAVPACK:
682 return put_wv_codecpriv(dyn_cp, par);
683 case AV_CODEC_ID_H264:
684 return ff_isom_write_avcc(dyn_cp, par->extradata,
685 par->extradata_size);
686 case AV_CODEC_ID_HEVC:
687 return ff_isom_write_hvcc(dyn_cp, par->extradata,
688 par->extradata_size, 0);
689 case AV_CODEC_ID_AV1:
690 if (par->extradata_size)
691 return ff_isom_write_av1c(dyn_cp, par->extradata,
692 par->extradata_size);
694 put_ebml_void(pb, 4 + 3);
696 case AV_CODEC_ID_ALAC:
697 if (par->extradata_size < 36) {
698 av_log(s, AV_LOG_ERROR,
699 "Invalid extradata found, ALAC expects a 36-byte "
701 return AVERROR_INVALIDDATA;
703 avio_write(dyn_cp, par->extradata + 12,
704 par->extradata_size - 12);
706 case AV_CODEC_ID_AAC:
707 if (par->extradata_size)
708 avio_write(dyn_cp, par->extradata, par->extradata_size);
710 put_ebml_void(pb, MAX_PCE_SIZE + 2 + 4);
713 if (par->codec_id == AV_CODEC_ID_PRORES &&
714 ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
715 avio_wl32(dyn_cp, par->codec_tag);
716 } else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
717 avio_write(dyn_cp, par->extradata, par->extradata_size);
723 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
724 AVCodecParameters *par,
725 int native_id, int qt_id)
729 int ret, codecpriv_size;
731 ret = avio_open_dyn_buf(&dyn_cp);
736 ret = mkv_write_native_codecprivate(s, pb, par, dyn_cp);
737 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
740 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
742 if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
743 && (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
746 avio_wb32(dyn_cp, 0x5a + par->extradata_size);
747 avio_wl32(dyn_cp, par->codec_tag);
748 for(i = 0; i < 0x5a - 8; i++)
751 avio_write(dyn_cp, par->extradata, par->extradata_size);
753 if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
754 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
755 avcodec_get_name(par->codec_id));
758 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
760 if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
761 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
762 avcodec_get_name(par->codec_id));
763 ret = AVERROR(EINVAL);
766 ff_put_bmp_header(dyn_cp, par, 0, 0);
768 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
770 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
772 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
773 avcodec_get_name(par->codec_id));
774 ret = AVERROR(EINVAL);
777 par->codec_tag = tag;
779 ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
782 codecpriv_size = avio_get_dyn_buf(dyn_cp, &codecpriv);
784 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
786 ffio_free_dyn_buf(&dyn_cp);
790 static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
792 uint8_t *colorinfo_ptr;
793 int side_data_size = 0;
794 int ret, colorinfo_size;
795 const uint8_t *side_data;
797 ret = avio_open_dyn_buf(&dyn_cp);
801 if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
802 par->color_trc < AVCOL_TRC_NB) {
803 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
806 if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
807 par->color_space < AVCOL_SPC_NB) {
808 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
810 if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
811 par->color_primaries < AVCOL_PRI_NB) {
812 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
814 if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
815 par->color_range < AVCOL_RANGE_NB) {
816 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
818 if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
819 par->chroma_location <= AVCHROMA_LOC_TOP) {
822 avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
823 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
824 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
827 side_data = av_stream_get_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
829 if (side_data_size) {
830 const AVContentLightMetadata *metadata =
831 (const AVContentLightMetadata*)side_data;
832 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXCLL, metadata->MaxCLL);
833 put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMAXFALL, metadata->MaxFALL);
836 side_data = av_stream_get_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
838 if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
839 ebml_master meta_element = start_ebml_master(
840 dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
841 const AVMasteringDisplayMetadata *metadata =
842 (const AVMasteringDisplayMetadata*)side_data;
843 if (metadata->has_primaries) {
844 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
845 av_q2d(metadata->display_primaries[0][0]));
846 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
847 av_q2d(metadata->display_primaries[0][1]));
848 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
849 av_q2d(metadata->display_primaries[1][0]));
850 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
851 av_q2d(metadata->display_primaries[1][1]));
852 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
853 av_q2d(metadata->display_primaries[2][0]));
854 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
855 av_q2d(metadata->display_primaries[2][1]));
856 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
857 av_q2d(metadata->white_point[0]));
858 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
859 av_q2d(metadata->white_point[1]));
861 if (metadata->has_luminance) {
862 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
863 av_q2d(metadata->max_luminance));
864 put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
865 av_q2d(metadata->min_luminance));
867 end_ebml_master(dyn_cp, meta_element);
870 colorinfo_size = avio_get_dyn_buf(dyn_cp, &colorinfo_ptr);
871 if (colorinfo_size) {
872 ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, colorinfo_size);
873 avio_write(pb, colorinfo_ptr, colorinfo_size);
874 end_ebml_master(pb, colorinfo);
876 ffio_free_dyn_buf(&dyn_cp);
880 static int mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
883 ebml_master projection;
884 int side_data_size = 0;
887 const AVSphericalMapping *spherical =
888 (const AVSphericalMapping *)av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
894 if (spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR &&
895 spherical->projection != AV_SPHERICAL_EQUIRECTANGULAR_TILE &&
896 spherical->projection != AV_SPHERICAL_CUBEMAP) {
897 av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
901 // Maximally 4 8-byte elements with id-length 2 + 1 byte length field
902 // and the private data of the AV_SPHERICAL_EQUIRECTANGULAR_TILE case
903 projection = start_ebml_master(pb, MATROSKA_ID_VIDEOPROJECTION,
904 4 * (2 + 1 + 8) + (2 + 1 + 20));
906 switch (spherical->projection) {
907 case AV_SPHERICAL_EQUIRECTANGULAR:
908 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
909 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
911 case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
912 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
913 MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
914 AV_WB32(private, 0); // version + flags
915 AV_WB32(private + 4, spherical->bound_top);
916 AV_WB32(private + 8, spherical->bound_bottom);
917 AV_WB32(private + 12, spherical->bound_left);
918 AV_WB32(private + 16, spherical->bound_right);
919 put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
922 case AV_SPHERICAL_CUBEMAP:
923 put_ebml_uint(pb, MATROSKA_ID_VIDEOPROJECTIONTYPE,
924 MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
925 AV_WB32(private, 0); // version + flags
926 AV_WB32(private + 4, 0); // layout
927 AV_WB32(private + 8, spherical->padding);
928 put_ebml_binary(pb, MATROSKA_ID_VIDEOPROJECTIONPRIVATE,
936 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW,
937 (double) spherical->yaw / (1 << 16));
938 if (spherical->pitch)
939 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH,
940 (double) spherical->pitch / (1 << 16));
942 put_ebml_float(pb, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL,
943 (double) spherical->roll / (1 << 16));
945 end_ebml_master(pb, projection);
950 static void mkv_write_field_order(AVIOContext *pb, int mode,
951 enum AVFieldOrder field_order)
953 switch (field_order) {
954 case AV_FIELD_UNKNOWN:
956 case AV_FIELD_PROGRESSIVE:
957 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
958 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
964 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
965 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
966 if (mode != MODE_WEBM) {
967 switch (field_order) {
969 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
970 MATROSKA_VIDEO_FIELDORDER_TT);
973 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
974 MATROSKA_VIDEO_FIELDORDER_BB);
977 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
978 MATROSKA_VIDEO_FIELDORDER_TB);
981 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
982 MATROSKA_VIDEO_FIELDORDER_BT);
989 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
990 AVStream *st, int mode, int *h_width, int *h_height)
994 AVDictionaryEntry *tag;
995 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
999 // convert metadata into proper side data and add it to the stream
1000 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
1001 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
1002 int stereo_mode = atoi(tag->value);
1004 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
1005 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
1010 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1011 stereo_mode != 10 && stereo_mode != 12) {
1012 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
1018 // iterate to find the stereo3d side data
1019 for (i = 0; i < st->nb_side_data; i++) {
1020 AVPacketSideData sd = st->side_data[i];
1021 if (sd.type == AV_PKT_DATA_STEREO3D) {
1022 AVStereo3D *stereo = (AVStereo3D *)sd.data;
1024 switch (stereo->type) {
1025 case AV_STEREO3D_2D:
1026 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
1028 case AV_STEREO3D_SIDEBYSIDE:
1029 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1030 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
1031 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
1034 case AV_STEREO3D_TOPBOTTOM:
1035 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
1036 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1040 case AV_STEREO3D_CHECKERBOARD:
1041 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
1042 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1045 case AV_STEREO3D_LINES:
1046 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
1047 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1051 case AV_STEREO3D_COLUMNS:
1052 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
1053 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1057 case AV_STEREO3D_FRAMESEQUENCE:
1058 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
1059 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1067 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1070 // if webm, do not write unsupported modes
1071 if ((mode == MODE_WEBM &&
1072 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
1073 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
1074 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
1075 av_log(s, AV_LOG_ERROR,
1076 "The specified stereo mode is not valid.\n");
1077 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1078 return AVERROR(EINVAL);
1081 // write StereoMode if format is valid
1082 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1087 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1088 int i, AVIOContext *pb, int default_stream_exists)
1090 AVStream *st = s->streams[i];
1091 AVCodecParameters *par = st->codecpar;
1092 ebml_master subinfo, track;
1096 int sample_rate = par->sample_rate;
1097 int output_sample_rate = 0;
1098 int display_width_div = 1;
1099 int display_height_div = 1;
1101 AVDictionaryEntry *tag;
1103 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1104 mkv->have_attachments = 1;
1108 if (par->codec_id == AV_CODEC_ID_AAC) {
1109 ret = get_aac_sample_rates(s, par->extradata, par->extradata_size, &sample_rate,
1110 &output_sample_rate);
1115 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1116 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1117 mkv->is_dash ? mkv->dash_track_number : i + 1);
1118 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1119 mkv->is_dash ? mkv->dash_track_number : i + 1);
1120 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1122 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1123 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1124 tag = av_dict_get(st->metadata, "language", NULL, 0);
1125 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE,
1126 tag && tag->value ? tag->value : "und");
1128 // The default value for TRACKFLAGDEFAULT is 1, so add element
1129 // if we need to clear it.
1130 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1131 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1133 if (st->disposition & AV_DISPOSITION_FORCED)
1134 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1136 if (mkv->mode == MODE_WEBM) {
1137 const char *codec_id;
1138 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1139 for (j = 0; ff_webm_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1140 if (ff_webm_codec_tags[j].id == par->codec_id) {
1141 codec_id = ff_webm_codec_tags[j].str;
1146 } else if (par->codec_id == AV_CODEC_ID_WEBVTT) {
1147 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1148 codec_id = "D_WEBVTT/CAPTIONS";
1149 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1150 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1151 codec_id = "D_WEBVTT/DESCRIPTIONS";
1152 native_id = MATROSKA_TRACK_TYPE_METADATA;
1153 } else if (st->disposition & AV_DISPOSITION_METADATA) {
1154 codec_id = "D_WEBVTT/METADATA";
1155 native_id = MATROSKA_TRACK_TYPE_METADATA;
1157 codec_id = "D_WEBVTT/SUBTITLES";
1158 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1163 av_log(s, AV_LOG_ERROR,
1164 "Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1165 return AVERROR(EINVAL);
1168 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1170 // look for a codec ID string specific to mkv to use,
1171 // if none are found, use AVI codes
1172 if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
1173 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1174 if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
1175 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1181 if (mkv->allow_raw_vfw) {
1184 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1185 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1186 return AVERROR(EINVAL);
1191 switch (par->codec_type) {
1192 case AVMEDIA_TYPE_VIDEO:
1193 mkv->have_video = 1;
1194 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1196 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1197 && av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1198 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1199 else if( st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0
1200 && av_cmp_q(av_inv_q(st->r_frame_rate), st->time_base) > 0)
1201 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->r_frame_rate.den / st->r_frame_rate.num);
1204 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1205 ((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1206 par->codec_id == AV_CODEC_ID_SVQ1 ||
1207 par->codec_id == AV_CODEC_ID_SVQ3 ||
1208 par->codec_id == AV_CODEC_ID_CINEPAK))
1212 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1213 else if (!native_id) {
1214 // if there is no mkv-specific codec ID, use VFW mode
1215 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1216 mkv->tracks[i].write_dts = 1;
1217 s->internal->avoid_negative_ts_use_pts = 0;
1220 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1222 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1223 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1225 mkv_write_field_order(pb, mkv->mode, par->field_order);
1227 // check both side data and metadata for stereo information,
1228 // write the result to the bitstream if any is found
1229 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1231 &display_height_div);
1235 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1236 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1237 (par->format == AV_PIX_FMT_YUVA420P)) {
1238 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1241 // write DisplayWidth and DisplayHeight, they contain the size of
1242 // a single source view and/or the display aspect ratio
1243 if (st->sample_aspect_ratio.num) {
1244 int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1245 if (d_width > INT_MAX) {
1246 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1247 return AVERROR(EINVAL);
1249 if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
1250 if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
1251 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1252 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1254 AVRational display_aspect_ratio;
1255 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
1256 par->width * (int64_t)st->sample_aspect_ratio.num,
1257 par->height * (int64_t)st->sample_aspect_ratio.den,
1259 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
1260 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
1261 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
1264 } else if (display_width_div != 1 || display_height_div != 1) {
1265 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1266 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1267 } else if (mkv->mode != MODE_WEBM)
1268 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1270 if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1271 uint32_t color_space = av_le2ne32(par->codec_tag);
1272 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1274 ret = mkv_write_video_color(pb, par, st);
1277 ret = mkv_write_video_projection(s, pb, st);
1280 end_ebml_master(pb, subinfo);
1283 case AVMEDIA_TYPE_AUDIO:
1284 if (par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1285 int64_t codecdelay = av_rescale_q(par->initial_padding,
1286 (AVRational){ 1, 48000 },
1287 (AVRational){ 1, 1000000000 });
1288 if (codecdelay < 0) {
1289 av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1290 return AVERROR(EINVAL);
1292 // mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1293 // (AVRational){ 1, par->sample_rate },
1296 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1298 if (par->codec_id == AV_CODEC_ID_OPUS)
1299 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1301 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1304 // no mkv-specific ID, use ACM mode
1305 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1307 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1308 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1310 mkv->tracks[i].sample_rate_offset = avio_tell(pb);
1311 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1312 if (output_sample_rate)
1313 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1315 bit_depth = av_get_bits_per_sample(par->codec_id);
1316 if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1317 if (par->bits_per_raw_sample)
1318 bit_depth = par->bits_per_raw_sample;
1320 bit_depth = av_get_bytes_per_sample(par->format) << 3;
1323 bit_depth = par->bits_per_coded_sample;
1325 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1326 end_ebml_master(pb, subinfo);
1329 case AVMEDIA_TYPE_SUBTITLE:
1331 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1332 return AVERROR(ENOSYS);
1335 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1336 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1338 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1341 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1342 return AVERROR(EINVAL);
1345 if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1346 mkv->tracks[i].codecpriv_offset = avio_tell(pb);
1347 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1352 end_ebml_master(pb, track);
1357 static int mkv_write_tracks(AVFormatContext *s)
1359 MatroskaMuxContext *mkv = s->priv_data;
1360 AVIOContext *pb = s->pb;
1361 int i, ret, default_stream_exists = 0;
1363 mkv_add_seekhead_entry(mkv, MATROSKA_ID_TRACKS, avio_tell(pb));
1365 ret = start_ebml_master_crc32(&mkv->tracks_bc, mkv);
1369 for (i = 0; i < s->nb_streams; i++) {
1370 AVStream *st = s->streams[i];
1371 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1373 for (i = 0; i < s->nb_streams; i++) {
1374 ret = mkv_write_track(s, mkv, i, mkv->tracks_bc, default_stream_exists);
1379 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1380 end_ebml_master_crc32_preliminary(pb, mkv->tracks_bc,
1381 MATROSKA_ID_TRACKS, &mkv->tracks_pos);
1383 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, MATROSKA_ID_TRACKS, 0, 0);
1388 static int mkv_write_chapters(AVFormatContext *s)
1390 MatroskaMuxContext *mkv = s->priv_data;
1391 AVIOContext *dyn_cp = NULL, *pb = s->pb;
1392 ebml_master editionentry;
1393 AVRational scale = {1, 1E9};
1396 if (!s->nb_chapters || mkv->wrote_chapters)
1399 mkv_add_seekhead_entry(mkv, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1401 ret = start_ebml_master_crc32(&dyn_cp, mkv);
1402 if (ret < 0) return ret;
1404 editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1405 if (mkv->mode != MODE_WEBM) {
1406 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1407 put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1409 for (i = 0; i < s->nb_chapters; i++) {
1410 ebml_master chapteratom, chapterdisplay;
1411 AVChapter *c = s->chapters[i];
1412 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1413 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1414 AVDictionaryEntry *t = NULL;
1415 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1416 av_log(s, AV_LOG_ERROR,
1417 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1418 chapterstart, chapterend);
1419 return AVERROR_INVALIDDATA;
1422 chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1423 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID,
1424 (uint32_t)c->id + (uint64_t)mkv->chapter_id_offset);
1425 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1426 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1427 if (mkv->mode != MODE_WEBM) {
1428 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1429 put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1431 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1432 chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1433 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1434 put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1435 end_ebml_master(dyn_cp, chapterdisplay);
1437 end_ebml_master(dyn_cp, chapteratom);
1439 end_ebml_master(dyn_cp, editionentry);
1440 end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CHAPTERS, 0, 0);
1442 mkv->wrote_chapters = 1;
1446 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1448 uint8_t *key = av_strdup(t->key);
1450 const uint8_t *lang = NULL;
1454 return AVERROR(ENOMEM);
1456 if ((p = strrchr(p, '-')) &&
1457 (lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1464 else if (*p >= 'a' && *p <= 'z')
1469 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1470 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1472 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1473 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1474 end_ebml_master(pb, tag);
1480 static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
1481 uint64_t uid, ebml_master *tag)
1484 MatroskaMuxContext *mkv = s->priv_data;
1485 ebml_master targets;
1488 if (!mkv->tags_bc) {
1489 mkv_add_seekhead_entry(mkv, MATROSKA_ID_TAGS, avio_tell(s->pb));
1491 ret = start_ebml_master_crc32(&mkv->tags_bc, mkv);
1497 *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1498 targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1500 put_ebml_uint(pb, elementid, uid);
1501 end_ebml_master(pb, targets);
1505 static int mkv_check_tag_name(const char *name, uint32_t elementid)
1507 return av_strcasecmp(name, "title") &&
1508 av_strcasecmp(name, "stereo_mode") &&
1509 av_strcasecmp(name, "creation_time") &&
1510 av_strcasecmp(name, "encoding_tool") &&
1511 av_strcasecmp(name, "duration") &&
1512 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1513 av_strcasecmp(name, "language")) &&
1514 (elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1515 (av_strcasecmp(name, "filename") &&
1516 av_strcasecmp(name, "mimetype")));
1519 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, uint32_t elementid,
1522 MatroskaMuxContext *mkv = s->priv_data;
1525 AVDictionaryEntry *t = NULL;
1527 ret = mkv_write_tag_targets(s, elementid, uid, &tag);
1531 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1532 if (mkv_check_tag_name(t->key, elementid)) {
1533 ret = mkv_write_simpletag(mkv->tags_bc, t);
1539 end_ebml_master(mkv->tags_bc, tag);
1543 static int mkv_check_tag(AVDictionary *m, uint32_t elementid)
1545 AVDictionaryEntry *t = NULL;
1547 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1548 if (mkv_check_tag_name(t->key, elementid))
1554 static int mkv_write_tags(AVFormatContext *s)
1556 MatroskaMuxContext *mkv = s->priv_data;
1559 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1561 if (mkv_check_tag(s->metadata, 0)) {
1562 ret = mkv_write_tag(s, s->metadata, 0, 0);
1563 if (ret < 0) return ret;
1566 for (i = 0; i < s->nb_streams; i++) {
1567 AVStream *st = s->streams[i];
1569 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1572 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1575 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1);
1576 if (ret < 0) return ret;
1579 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
1580 for (i = 0; i < s->nb_streams; i++) {
1582 AVStream *st = s->streams[i];
1583 ebml_master tag_target;
1586 if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1589 ret = mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID,
1590 i + 1, &tag_target);
1595 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1596 put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1597 mkv->tracks[i].duration_offset = avio_tell(pb);
1599 // Reserve space to write duration as a 20-byte string.
1600 // 2 (ebml id) + 1 (data size) + 20 (data)
1601 put_ebml_void(pb, 23);
1602 end_ebml_master(pb, tag);
1603 end_ebml_master(pb, tag_target);
1607 if (mkv->mode != MODE_WEBM) {
1608 for (i = 0; i < s->nb_chapters; i++) {
1609 AVChapter *ch = s->chapters[i];
1611 if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1614 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID,
1615 (uint32_t)ch->id + (uint64_t)mkv->chapter_id_offset);
1621 if (mkv->have_attachments && mkv->mode != MODE_WEBM) {
1622 for (i = 0; i < mkv->attachments->num_entries; i++) {
1623 mkv_attachment *attachment = &mkv->attachments->entries[i];
1624 AVStream *st = s->streams[attachment->stream_idx];
1626 if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1629 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid);
1636 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1637 end_ebml_master_crc32_preliminary(s->pb, mkv->tags_bc,
1638 MATROSKA_ID_TAGS, &mkv->tags_pos);
1640 end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS, 0, 0);
1645 static int mkv_write_attachments(AVFormatContext *s)
1647 MatroskaMuxContext *mkv = s->priv_data;
1648 AVIOContext *dyn_cp = NULL, *pb = s->pb;
1652 if (!mkv->have_attachments)
1655 mkv->attachments = av_mallocz(sizeof(*mkv->attachments));
1656 if (!mkv->attachments)
1657 return AVERROR(ENOMEM);
1659 av_lfg_init(&c, av_get_random_seed());
1661 mkv_add_seekhead_entry(mkv, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1663 ret = start_ebml_master_crc32(&dyn_cp, mkv);
1664 if (ret < 0) return ret;
1666 for (i = 0; i < s->nb_streams; i++) {
1667 AVStream *st = s->streams[i];
1668 ebml_master attached_file;
1669 mkv_attachment *attachment = mkv->attachments->entries;
1670 AVDictionaryEntry *t;
1671 const char *mimetype = NULL;
1674 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1677 attachment = av_realloc_array(attachment, mkv->attachments->num_entries + 1, sizeof(mkv_attachment));
1679 return AVERROR(ENOMEM);
1680 mkv->attachments->entries = attachment;
1682 attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1684 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1685 put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1686 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1687 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1688 return AVERROR(EINVAL);
1690 put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1691 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1692 mimetype = t->value;
1693 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1695 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1696 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1697 mimetype = ff_mkv_mime_tags[i].str;
1700 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1701 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1702 mimetype = ff_mkv_image_mime_tags[i].str;
1707 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1708 "it cannot be deduced from the codec id.\n", i);
1709 return AVERROR(EINVAL);
1712 if (s->flags & AVFMT_FLAG_BITEXACT) {
1713 struct AVSHA *sha = av_sha_alloc();
1716 return AVERROR(ENOMEM);
1717 av_sha_init(sha, 160);
1718 av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1719 av_sha_final(sha, digest);
1721 fileuid = AV_RL32(digest);
1723 fileuid = av_lfg_get(&c);
1725 av_log(s, AV_LOG_VERBOSE, "Using %.8"PRIx32" for attachment %d\n",
1726 fileuid, mkv->attachments->num_entries);
1728 put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1729 put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1730 put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1731 end_ebml_master(dyn_cp, attached_file);
1733 mkv->attachments->entries[mkv->attachments->num_entries].stream_idx = i;
1734 mkv->attachments->entries[mkv->attachments->num_entries++].fileuid = fileuid;
1736 end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS, 0, 0);
1741 static int64_t get_metadata_duration(AVFormatContext *s)
1747 AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1748 if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1749 av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1753 for (i = 0; i < s->nb_streams; i++) {
1755 AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1757 if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1758 max = FFMAX(max, us);
1761 av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1765 static int mkv_write_header(AVFormatContext *s)
1767 MatroskaMuxContext *mkv = s->priv_data;
1768 AVIOContext *pb = s->pb;
1769 ebml_master ebml_header;
1770 AVDictionaryEntry *tag;
1771 int ret, i, version = 2;
1772 int64_t creation_time;
1774 if (!strcmp(s->oformat->name, "webm")) {
1775 mkv->mode = MODE_WEBM;
1778 mkv->mode = MODE_MATROSKAv2;
1780 if (mkv->mode != MODE_WEBM ||
1781 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1782 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1785 for (i = 0; i < s->nb_streams; i++) {
1786 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1787 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1788 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1792 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1794 return AVERROR(ENOMEM);
1796 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, MAX_EBML_HEADER_SIZE);
1797 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1798 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1799 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1800 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1801 put_ebml_string(pb, EBML_ID_DOCTYPE , s->oformat->name);
1802 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1803 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION, 2);
1804 end_ebml_master(pb, ebml_header);
1806 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1807 mkv->segment_offset = avio_tell(pb);
1809 // we write a seek head at the beginning to point to all other level
1810 // one elements (except Clusters).
1811 mkv_start_seekhead(mkv, pb);
1813 mkv_add_seekhead_entry(mkv, MATROSKA_ID_INFO, avio_tell(pb));
1815 ret = start_ebml_master_crc32(&mkv->info_bc, mkv);
1820 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1821 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1822 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1823 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1824 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1825 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1826 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1828 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1830 if (mkv->mode != MODE_WEBM) {
1831 uint32_t segment_uid[4];
1834 av_lfg_init(&lfg, av_get_random_seed());
1836 for (i = 0; i < 4; i++)
1837 segment_uid[i] = av_lfg_get(&lfg);
1839 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1842 const char *ident = "Lavf";
1843 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1844 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1847 if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1848 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1849 int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1850 uint8_t date_utc_buf[8];
1851 AV_WB64(date_utc_buf, date_utc);
1852 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1855 // reserve space for the duration
1857 mkv->duration_offset = avio_tell(pb);
1858 if (!mkv->is_live) {
1859 int64_t metadata_duration = get_metadata_duration(s);
1861 if (s->duration > 0) {
1862 int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1863 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1864 av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1865 } else if (metadata_duration > 0) {
1866 int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1867 put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1868 av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1870 put_ebml_void(pb, 11); // assumes double-precision float to be written
1873 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1874 end_ebml_master_crc32_preliminary(s->pb, mkv->info_bc,
1875 MATROSKA_ID_INFO, &mkv->info_pos);
1877 end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, MATROSKA_ID_INFO, 0, 0);
1880 ret = mkv_write_tracks(s);
1884 for (i = 0; i < s->nb_chapters; i++)
1885 if (!s->chapters[i]->id) {
1886 mkv->chapter_id_offset = 1;
1890 ret = mkv_write_chapters(s);
1894 if (mkv->mode != MODE_WEBM) {
1895 ret = mkv_write_attachments(s);
1900 ret = mkv_write_tags(s);
1904 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
1905 ret = mkv_write_seekhead(pb, mkv, 0, avio_tell(pb));
1910 if (s->metadata_header_padding > 0) {
1911 if (s->metadata_header_padding == 1)
1912 s->metadata_header_padding++;
1913 put_ebml_void(pb, s->metadata_header_padding);
1916 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && mkv->reserve_cues_space) {
1917 mkv->cues_pos = avio_tell(pb);
1918 if (mkv->reserve_cues_space == 1)
1919 mkv->reserve_cues_space++;
1920 put_ebml_void(pb, mkv->reserve_cues_space);
1923 av_init_packet(&mkv->cur_audio_pkt);
1924 mkv->cur_audio_pkt.size = 0;
1925 mkv->cluster_pos = -1;
1927 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1928 // after 4k and on a keyframe
1929 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
1930 if (mkv->cluster_time_limit < 0)
1931 mkv->cluster_time_limit = 5000;
1932 if (mkv->cluster_size_limit < 0)
1933 mkv->cluster_size_limit = 5 * 1024 * 1024;
1935 if (mkv->cluster_time_limit < 0)
1936 mkv->cluster_time_limit = 1000;
1937 if (mkv->cluster_size_limit < 0)
1938 mkv->cluster_size_limit = 32 * 1024;
1944 static int mkv_blockgroup_size(int pkt_size)
1946 int size = pkt_size + 4;
1947 size += ebml_num_size(size);
1948 size += 2; // EBML ID for block and block duration
1949 size += 9; // max size of block duration incl. length field
1953 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1960 dst = av_malloc(srclen);
1962 return AVERROR(ENOMEM);
1964 while (srclen >= WV_HEADER_SIZE) {
1967 ret = ff_wv_parse_header(&header, src);
1970 src += WV_HEADER_SIZE;
1971 srclen -= WV_HEADER_SIZE;
1973 if (srclen < header.blocksize) {
1974 ret = AVERROR_INVALIDDATA;
1978 if (header.initial) {
1979 AV_WL32(dst + offset, header.samples);
1982 AV_WL32(dst + offset, header.flags);
1983 AV_WL32(dst + offset + 4, header.crc);
1986 if (!(header.initial && header.final)) {
1987 AV_WL32(dst + offset, header.blocksize);
1991 memcpy(dst + offset, src, header.blocksize);
1992 src += header.blocksize;
1993 srclen -= header.blocksize;
1994 offset += header.blocksize;
2006 static int mkv_write_block(AVFormatContext *s, AVIOContext *pb,
2007 uint32_t blockid, AVPacket *pkt, int keyframe)
2009 MatroskaMuxContext *mkv = s->priv_data;
2010 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2011 mkv_track *track = &mkv->tracks[pkt->stream_index];
2012 uint8_t *data = NULL, *side_data = NULL;
2013 int err = 0, offset = 0, size = pkt->size, side_data_size = 0;
2014 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2015 uint64_t additional_id;
2016 int64_t discard_padding = 0;
2017 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
2018 ebml_master block_group, block_additions, block_more;
2020 ts += track->ts_offset;
2022 /* The following string is identical to the one in mkv_write_vtt_blocks
2023 * so that only one copy needs to exist in binaries. */
2024 av_log(s, AV_LOG_DEBUG,
2025 "Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
2026 "duration %" PRId64 " at relative offset %" PRId64 " in cluster "
2027 "at offset %" PRId64 ". TrackNumber %d, keyframe %d\n",
2028 pkt->size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
2029 mkv->cluster_pos, track_number, keyframe != 0);
2031 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
2032 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
2033 err = ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
2034 } else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
2035 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1)) {
2036 /* extradata is Annex B, assume the bitstream is too and convert it */
2037 err = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
2038 } else if (par->codec_id == AV_CODEC_ID_AV1) {
2039 err = ff_av1_filter_obus_buf(pkt->data, &data, &size, &offset);
2040 } else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
2041 err = mkv_strip_wavpack(pkt->data, &data, &size);
2046 av_log(s, AV_LOG_ERROR, "Error when reformatting data of "
2047 "a packet from stream %d.\n", pkt->stream_index);
2051 if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
2052 /* Matroska specification requires to remove the first QuickTime atom
2058 side_data = av_packet_get_side_data(pkt,
2059 AV_PKT_DATA_SKIP_SAMPLES,
2061 if (side_data && side_data_size >= 10) {
2062 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
2063 (AVRational){1, par->sample_rate},
2064 (AVRational){1, 1000000000});
2067 side_data = av_packet_get_side_data(pkt,
2068 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2071 // Only the Codec-specific BlockMore (id == 1) is currently supported.
2072 if (side_data_size < 8 || (additional_id = AV_RB64(side_data)) != 1) {
2076 side_data_size -= 8;
2080 if (side_data_size || discard_padding) {
2081 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
2082 blockid = MATROSKA_ID_BLOCK;
2085 put_ebml_id(pb, blockid);
2086 put_ebml_num(pb, size + 4, 0);
2087 // this assumes stream_index is less than 126
2088 avio_w8(pb, 0x80 | track_number);
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);
2098 track->last_timestamp = ts;
2100 if (discard_padding) {
2101 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
2104 if (side_data_size) {
2105 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2106 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2107 /* Until dbc50f8a our demuxer used a wrong default value
2108 * of BlockAddID, so we write it unconditionally. */
2109 put_ebml_uint (pb, MATROSKA_ID_BLOCKADDID, additional_id);
2110 put_ebml_binary(pb, MATROSKA_ID_BLOCKADDITIONAL,
2111 side_data, side_data_size);
2112 end_ebml_master(pb, block_more);
2113 end_ebml_master(pb, block_additions);
2115 if (side_data_size || discard_padding) {
2116 end_ebml_master(pb, block_group);
2122 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
2124 MatroskaMuxContext *mkv = s->priv_data;
2125 ebml_master blockgroup;
2126 int id_size, settings_size, size;
2127 uint8_t *id, *settings;
2128 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2129 const int flags = 0;
2132 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2136 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2139 size = id_size + 1 + settings_size + 1 + pkt->size;
2141 /* The following string is identical to the one in mkv_write_block so that
2142 * only one copy needs to exist in binaries. */
2143 av_log(s, AV_LOG_DEBUG,
2144 "Writing block of size %d with pts %" PRId64 ", dts %" PRId64 ", "
2145 "duration %" PRId64 " at relative offset %" PRId64 " in cluster "
2146 "at offset %" PRId64 ". TrackNumber %d, keyframe %d\n",
2147 size, pkt->pts, pkt->dts, pkt->duration, avio_tell(pb),
2148 mkv->cluster_pos, pkt->stream_index + 1, 1);
2150 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
2152 put_ebml_id(pb, MATROSKA_ID_BLOCK);
2153 put_ebml_num(pb, size + 4, 0);
2154 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
2155 avio_wb16(pb, ts - mkv->cluster_pts);
2157 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2159 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2160 end_ebml_master(pb, blockgroup);
2162 return pkt->duration;
2165 static void mkv_end_cluster(AVFormatContext *s)
2167 MatroskaMuxContext *mkv = s->priv_data;
2169 end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, MATROSKA_ID_CLUSTER, 0, 1);
2170 mkv->cluster_pos = -1;
2171 avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
2174 static int mkv_check_new_extra_data(AVFormatContext *s, AVPacket *pkt)
2176 MatroskaMuxContext *mkv = s->priv_data;
2177 mkv_track *track = &mkv->tracks[pkt->stream_index];
2178 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2180 int side_data_size = 0, ret;
2182 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
2185 switch (par->codec_id) {
2186 case AV_CODEC_ID_AAC:
2187 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2188 int filler, output_sample_rate = 0;
2189 ret = get_aac_sample_rates(s, side_data, side_data_size, &track->sample_rate,
2190 &output_sample_rate);
2193 if (!output_sample_rate)
2194 output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
2195 ret = ff_alloc_extradata(par, side_data_size);
2198 memcpy(par->extradata, side_data, side_data_size);
2199 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2200 mkv_write_codecprivate(s, mkv->tracks_bc, par, 1, 0);
2201 filler = MAX_PCE_SIZE + 2 + 4 - (avio_tell(mkv->tracks_bc) - track->codecpriv_offset);
2203 put_ebml_void(mkv->tracks_bc, filler);
2204 avio_seek(mkv->tracks_bc, track->sample_rate_offset, SEEK_SET);
2205 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
2206 put_ebml_float(mkv->tracks_bc, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
2207 } else if (!par->extradata_size && !track->sample_rate) {
2208 // No extradata (codecpar or packet side data).
2209 av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
2210 return AVERROR(EINVAL);
2213 case AV_CODEC_ID_FLAC:
2214 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2215 AVCodecParameters *codecpriv_par;
2216 if (side_data_size != par->extradata_size) {
2217 av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
2219 return AVERROR(EINVAL);
2221 codecpriv_par = avcodec_parameters_alloc();
2223 return AVERROR(ENOMEM);
2224 ret = avcodec_parameters_copy(codecpriv_par, par);
2226 avcodec_parameters_free(&codecpriv_par);
2229 memcpy(codecpriv_par->extradata, side_data, side_data_size);
2230 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2231 mkv_write_codecprivate(s, mkv->tracks_bc, codecpriv_par, 1, 0);
2232 avcodec_parameters_free(&codecpriv_par);
2235 // FIXME: Remove the following once libaom starts propagating extradata during init()
2236 // See https://bugs.chromium.org/p/aomedia/issues/detail?id=2012
2237 case AV_CODEC_ID_AV1:
2238 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live &&
2239 !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_close_dyn_buf(dyn_cp, &codecpriv);
2248 if (!codecpriv_size) {
2250 return AVERROR_INVALIDDATA;
2252 avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2253 // Do not write the OBUs as we don't have space saved for them
2254 put_ebml_binary(mkv->tracks_bc, MATROSKA_ID_CODECPRIVATE, codecpriv, 4);
2256 ret = ff_alloc_extradata(par, side_data_size);
2259 memcpy(par->extradata, side_data, side_data_size);
2260 } else if (!par->extradata_size)
2261 return AVERROR_INVALIDDATA;
2265 av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
2272 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2274 MatroskaMuxContext *mkv = s->priv_data;
2276 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2277 mkv_track *track = &mkv->tracks[pkt->stream_index];
2278 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2279 int duration = pkt->duration;
2281 int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
2282 int64_t relative_packet_pos;
2283 int tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
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) {
2295 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2299 if (mkv->cluster_pos == -1) {
2300 ret = start_ebml_master_crc32(&mkv->cluster_bc, mkv);
2303 mkv->cluster_pos = avio_tell(s->pb);
2304 put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2305 mkv->cluster_pts = FFMAX(0, ts);
2306 av_log(s, AV_LOG_DEBUG,
2307 "Starting new cluster with timestamp "
2308 "%" PRId64 " at offset %" PRId64 " bytes\n",
2309 mkv->cluster_pts, mkv->cluster_pos);
2311 pb = mkv->cluster_bc;
2313 relative_packet_pos = avio_tell(pb);
2315 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2316 ret = mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2319 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2320 ret = mkv_add_cuepoint(mkv, pkt->stream_index, tracknum, ts,
2321 mkv->cluster_pos, relative_packet_pos, -1);
2322 if (ret < 0) return ret;
2325 if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2326 duration = mkv_write_vtt_blocks(s, pb, pkt);
2328 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2329 mkv_blockgroup_size(pkt->size));
2331 #if FF_API_CONVERGENCE_DURATION
2332 FF_DISABLE_DEPRECATION_WARNINGS
2333 /* For backward compatibility, prefer convergence_duration. */
2334 if (pkt->convergence_duration > 0) {
2335 duration = pkt->convergence_duration;
2337 FF_ENABLE_DEPRECATION_WARNINGS
2339 /* All subtitle blocks are considered to be keyframes. */
2340 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2341 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2342 end_ebml_master(pb, blockgroup);
2345 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
2346 ret = mkv_add_cuepoint(mkv, pkt->stream_index, tracknum, ts,
2347 mkv->cluster_pos, relative_packet_pos, duration);
2353 mkv->duration = FFMAX(mkv->duration, ts + duration);
2354 track->duration = FFMAX(track->duration, ts + duration);
2359 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2361 MatroskaMuxContext *mkv = s->priv_data;
2362 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2363 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2365 int64_t cluster_time;
2367 int start_new_cluster;
2369 ret = mkv_check_new_extra_data(s, pkt);
2373 if (mkv->tracks[pkt->stream_index].write_dts)
2374 cluster_time = pkt->dts - mkv->cluster_pts;
2376 cluster_time = pkt->pts - mkv->cluster_pts;
2377 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2379 cluster_size = avio_tell(mkv->cluster_bc);
2381 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2382 // WebM DASH specification states that the first block of every cluster
2383 // has to be a key frame. So for DASH video, we only create a cluster
2384 // on seeing key frames.
2385 start_new_cluster = keyframe;
2386 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2387 (mkv->cluster_pos == -1 ||
2388 cluster_time > mkv->cluster_time_limit)) {
2389 // For DASH audio, we create a Cluster based on cluster_time_limit
2390 start_new_cluster = 1;
2391 } else if (!mkv->is_dash &&
2392 (cluster_size > mkv->cluster_size_limit ||
2393 cluster_time > mkv->cluster_time_limit ||
2394 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2395 cluster_size > 4 * 1024))) {
2396 start_new_cluster = 1;
2398 start_new_cluster = 0;
2401 if (mkv->cluster_pos != -1 && start_new_cluster) {
2405 if (!mkv->cluster_pos)
2406 avio_write_marker(s->pb,
2407 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2408 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2410 // check if we have an audio packet cached
2411 if (mkv->cur_audio_pkt.size > 0) {
2412 // for DASH audio, a CuePoint has to be added when there is a new cluster.
2413 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2414 mkv->is_dash ? start_new_cluster : 0);
2415 av_packet_unref(&mkv->cur_audio_pkt);
2417 av_log(s, AV_LOG_ERROR,
2418 "Could not write cached audio packet ret:%d\n", ret);
2423 // buffer an audio packet to ensure the packet containing the video
2424 // keyframe's timecode is contained in the same cluster for WebM
2425 if (codec_type == AVMEDIA_TYPE_AUDIO) {
2427 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2429 ret = mkv_write_packet_internal(s, pkt, 0);
2433 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2435 MatroskaMuxContext *mkv = s->priv_data;
2438 if (mkv->cluster_pos != -1) {
2440 av_log(s, AV_LOG_DEBUG,
2441 "Flushing cluster at offset %" PRIu64 " bytes\n",
2446 return mkv_write_packet(s, pkt);
2449 static int mkv_write_trailer(AVFormatContext *s)
2451 MatroskaMuxContext *mkv = s->priv_data;
2452 AVIOContext *pb = s->pb;
2455 // check if we have an audio packet cached
2456 if (mkv->cur_audio_pkt.size > 0) {
2457 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2459 av_log(s, AV_LOG_ERROR,
2460 "Could not write cached audio packet ret:%d\n", ret);
2465 if (mkv->cluster_bc) {
2466 end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv,
2467 MATROSKA_ID_CLUSTER, 0, 0);
2470 ret = mkv_write_chapters(s);
2475 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2476 int64_t endpos, ret64;
2478 endpos = avio_tell(pb);
2480 if (mkv->cues.num_entries) {
2481 AVIOContext *cues = NULL;
2483 int64_t cuespos = endpos;
2484 int length_size = 0;
2486 ret = start_ebml_master_crc32(&cues, mkv);
2490 ret = mkv_assemble_cues(s->streams, cues, &mkv->cues,
2491 mkv->tracks, s->nb_streams);
2493 ffio_free_dyn_buf(&cues);
2497 if (mkv->reserve_cues_space) {
2498 size = avio_tell(cues);
2499 length_size = ebml_num_size(size);
2500 size += 4 + length_size;
2501 if (mkv->reserve_cues_space < size) {
2502 av_log(s, AV_LOG_WARNING,
2503 "Insufficient space reserved for Cues: "
2504 "%d < %"PRIu64". No Cues will be output.\n",
2505 mkv->reserve_cues_space, size);
2506 mkv->reserve_cues_space = -1;
2507 ffio_free_dyn_buf(&cues);
2510 cuespos = mkv->cues_pos;
2511 if ((ret64 = avio_seek(pb, mkv->cues_pos, SEEK_SET)) < 0) {
2512 ffio_free_dyn_buf(&cues);
2515 if (mkv->reserve_cues_space == size + 1) {
2516 /* There is no way to reserve a single byte because
2517 * the minimal size of an EBML Void element is 2
2518 * (1 byte ID, 1 byte length field). This problem
2519 * is solved by writing the Cues' length field on
2520 * one byte more than necessary. */
2526 mkv_add_seekhead_entry(mkv, MATROSKA_ID_CUES, cuespos);
2527 end_ebml_master_crc32(pb, &cues, mkv, MATROSKA_ID_CUES,
2529 if (mkv->reserve_cues_space) {
2530 if (size < mkv->reserve_cues_space)
2531 put_ebml_void(pb, mkv->reserve_cues_space - size);
2533 endpos = avio_tell(pb);
2537 ret = mkv_write_seekhead(pb, mkv, 1, mkv->info_pos);
2541 // update the duration
2542 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2543 avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2544 put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2545 end_ebml_master_crc32(pb, &mkv->info_bc, mkv, MATROSKA_ID_INFO, 0, 0);
2547 // write tracks master
2548 avio_seek(pb, mkv->tracks_pos, SEEK_SET);
2549 end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, MATROSKA_ID_TRACKS, 0, 0);
2551 // update stream durations
2554 for (i = 0; i < s->nb_streams; ++i) {
2555 AVStream *st = s->streams[i];
2556 mkv_track *track = &mkv->tracks[i];
2558 if (track->duration_offset > 0) {
2559 double duration_sec = track->duration * av_q2d(st->time_base);
2560 char duration_string[20] = "";
2562 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2565 avio_seek(mkv->tags_bc, track->duration_offset, SEEK_SET);
2567 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2568 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2569 fmod(duration_sec, 60));
2571 put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2575 avio_seek(pb, mkv->tags_pos, SEEK_SET);
2576 end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS, 0, 0);
2579 avio_seek(pb, endpos, SEEK_SET);
2582 if (!mkv->is_live) {
2583 end_ebml_master(pb, mkv->segment);
2586 return mkv->reserve_cues_space < 0 ? AVERROR(EINVAL) : 0;
2589 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2592 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2593 if (ff_mkv_codec_tags[i].id == codec_id)
2596 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2597 enum AVMediaType type = avcodec_get_type(codec_id);
2598 // mkv theoretically supports any video/audio through VFW/ACM
2599 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2606 static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
2609 for (i = 0; ff_webm_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2610 if (ff_webm_codec_tags[i].id == codec_id)
2616 static int mkv_init(struct AVFormatContext *s)
2620 if (s->nb_streams > MAX_TRACKS) {
2621 av_log(s, AV_LOG_ERROR,
2622 "At most %d streams are supported for muxing in Matroska\n",
2624 return AVERROR(EINVAL);
2627 for (i = 0; i < s->nb_streams; i++) {
2628 if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
2629 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
2630 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
2631 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
2632 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
2633 s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
2634 av_log(s, AV_LOG_ERROR,
2635 "The Matroska muxer does not yet support muxing %s\n",
2636 avcodec_get_name(s->streams[i]->codecpar->codec_id));
2637 return AVERROR_PATCHWELCOME;
2641 if (s->avoid_negative_ts < 0) {
2642 s->avoid_negative_ts = 1;
2643 s->internal->avoid_negative_ts_use_pts = 1;
2646 for (i = 0; i < s->nb_streams; i++) {
2647 // ms precision is the de-facto standard timescale for mkv files
2648 avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2654 static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2657 AVStream *st = s->streams[pkt->stream_index];
2659 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2660 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2661 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2662 } else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2663 ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2669 static const AVCodecTag additional_audio_tags[] = {
2670 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2671 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2672 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2673 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2674 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2675 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2676 { AV_CODEC_ID_QDMC, 0xFFFFFFFF },
2677 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2678 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2679 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2680 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2681 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2682 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2685 static const AVCodecTag additional_video_tags[] = {
2686 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2687 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2688 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2689 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2692 static const AVCodecTag additional_subtitle_tags[] = {
2693 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2694 { AV_CODEC_ID_DVD_SUBTITLE, 0xFFFFFFFF },
2695 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2696 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2699 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2700 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2701 static const AVOption options[] = {
2702 { "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 },
2703 { "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 },
2704 { "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 },
2705 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2706 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2707 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2708 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2709 { "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2713 #if CONFIG_MATROSKA_MUXER
2714 static const AVClass matroska_class = {
2715 .class_name = "matroska muxer",
2716 .item_name = av_default_item_name,
2718 .version = LIBAVUTIL_VERSION_INT,
2721 AVOutputFormat ff_matroska_muxer = {
2723 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2724 .mime_type = "video/x-matroska",
2725 .extensions = "mkv",
2726 .priv_data_size = sizeof(MatroskaMuxContext),
2727 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2728 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2729 .video_codec = CONFIG_LIBX264_ENCODER ?
2730 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2732 .deinit = mkv_deinit,
2733 .write_header = mkv_write_header,
2734 .write_packet = mkv_write_flush_packet,
2735 .write_trailer = mkv_write_trailer,
2736 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2737 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2738 .codec_tag = (const AVCodecTag* const []){
2739 ff_codec_bmp_tags, ff_codec_wav_tags,
2740 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2742 .subtitle_codec = AV_CODEC_ID_ASS,
2743 .query_codec = mkv_query_codec,
2744 .check_bitstream = mkv_check_bitstream,
2745 .priv_class = &matroska_class,
2749 #if CONFIG_WEBM_MUXER
2750 static const AVClass webm_class = {
2751 .class_name = "webm muxer",
2752 .item_name = av_default_item_name,
2754 .version = LIBAVUTIL_VERSION_INT,
2757 AVOutputFormat ff_webm_muxer = {
2759 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2760 .mime_type = "video/webm",
2761 .extensions = "webm",
2762 .priv_data_size = sizeof(MatroskaMuxContext),
2763 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2764 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2765 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2767 .deinit = mkv_deinit,
2768 .write_header = mkv_write_header,
2769 .write_packet = mkv_write_flush_packet,
2770 .write_trailer = mkv_write_trailer,
2771 .query_codec = webm_query_codec,
2772 .check_bitstream = mkv_check_bitstream,
2773 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2774 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2775 .priv_class = &webm_class,
2779 #if CONFIG_MATROSKA_AUDIO_MUXER
2780 static const AVClass mka_class = {
2781 .class_name = "matroska audio muxer",
2782 .item_name = av_default_item_name,
2784 .version = LIBAVUTIL_VERSION_INT,
2786 AVOutputFormat ff_matroska_audio_muxer = {
2788 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2789 .mime_type = "audio/x-matroska",
2790 .extensions = "mka",
2791 .priv_data_size = sizeof(MatroskaMuxContext),
2792 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2793 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2794 .video_codec = AV_CODEC_ID_NONE,
2796 .deinit = mkv_deinit,
2797 .write_header = mkv_write_header,
2798 .write_packet = mkv_write_flush_packet,
2799 .write_trailer = mkv_write_trailer,
2800 .check_bitstream = mkv_check_bitstream,
2801 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2803 .codec_tag = (const AVCodecTag* const []){
2804 ff_codec_wav_tags, additional_audio_tags, 0
2806 .priv_class = &mka_class,