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
27 #include "avio_internal.h"
28 #include "avlanguage.h"
34 #include "subtitles.h"
35 #include "vorbiscomment.h"
38 #include "libavutil/avstring.h"
39 #include "libavutil/channel_layout.h"
40 #include "libavutil/dict.h"
41 #include "libavutil/intfloat.h"
42 #include "libavutil/intreadwrite.h"
43 #include "libavutil/lfg.h"
44 #include "libavutil/mathematics.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/random_seed.h"
47 #include "libavutil/samplefmt.h"
48 #include "libavutil/sha.h"
49 #include "libavutil/stereo3d.h"
51 #include "libavcodec/xiph.h"
52 #include "libavcodec/mpeg4audio.h"
53 #include "libavcodec/internal.h"
55 typedef struct ebml_master {
56 int64_t pos; ///< absolute offset in the file where the master's elements start
57 int sizebytes; ///< how many bytes were reserved for the size
60 typedef struct mkv_seekhead_entry {
61 unsigned int elementid;
65 typedef struct mkv_seekhead {
67 int64_t segment_offset; ///< the file offset to the beginning of the segment
68 int reserved_size; ///< -1 if appending to file
70 mkv_seekhead_entry *entries;
74 typedef struct mkv_cuepoint {
78 int64_t cluster_pos; ///< file offset of the cluster containing the block
79 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
80 int64_t duration; ///< duration of the block according to time base
83 typedef struct mkv_cues {
84 int64_t segment_offset;
85 mkv_cuepoint *entries;
89 typedef struct mkv_track {
95 #define MODE_MATROSKAv2 0x01
96 #define MODE_WEBM 0x02
98 typedef struct MatroskaMuxContext {
103 int64_t segment_offset;
105 int64_t cluster_pos; ///< file offset of the current cluster
107 int64_t duration_offset;
109 mkv_seekhead *main_seekhead;
113 AVPacket cur_audio_pkt;
115 int have_attachments;
117 int reserve_cues_space;
118 int cluster_size_limit;
120 int64_t cluster_time_limit;
122 int dash_track_number;
125 uint32_t chapter_id_offset;
129 } MatroskaMuxContext;
132 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
133 * offset, 4 bytes for target EBML ID */
134 #define MAX_SEEKENTRY_SIZE 21
136 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
138 #define MAX_CUETRACKPOS_SIZE 42
140 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
141 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
143 /** Seek preroll value for opus */
144 #define OPUS_SEEK_PREROLL 80000000
146 static int ebml_id_size(unsigned int id)
148 return (av_log2(id + 1) - 1) / 7 + 1;
151 static void put_ebml_id(AVIOContext *pb, unsigned int id)
153 int i = ebml_id_size(id);
155 avio_w8(pb, (uint8_t)(id >> (i * 8)));
159 * Write an EBML size meaning "unknown size".
161 * @param bytes The number of bytes the size should occupy (maximum: 8).
163 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
165 av_assert0(bytes <= 8);
166 avio_w8(pb, 0x1ff >> bytes);
167 ffio_fill(pb, 0xff, bytes - 1);
171 * Calculate how many bytes are needed to represent a given number in EBML.
173 static int ebml_num_size(uint64_t num)
176 while ((num + 1) >> bytes * 7)
182 * Write a number in EBML variable length format.
184 * @param bytes The number of bytes that need to be used to write the number.
185 * If zero, any number of bytes can be used.
187 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
189 int i, needed_bytes = ebml_num_size(num);
191 // sizes larger than this are currently undefined in EBML
192 av_assert0(num < (1ULL << 56) - 1);
195 // don't care how many bytes are used, so use the min
196 bytes = needed_bytes;
197 // the bytes needed to write the given size would exceed the bytes
198 // that we need to use, so write unknown size. This shouldn't happen.
199 av_assert0(bytes >= needed_bytes);
201 num |= 1ULL << bytes * 7;
202 for (i = bytes - 1; i >= 0; i--)
203 avio_w8(pb, (uint8_t)(num >> i * 8));
206 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
213 put_ebml_id(pb, elementid);
214 put_ebml_num(pb, bytes, 0);
215 for (i = bytes - 1; i >= 0; i--)
216 avio_w8(pb, (uint8_t)(val >> i * 8));
219 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
222 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
224 while (tmp>>=8) bytes++;
226 put_ebml_id(pb, elementid);
227 put_ebml_num(pb, bytes, 0);
228 for (i = bytes - 1; i >= 0; i--)
229 avio_w8(pb, (uint8_t)(val >> i * 8));
232 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
234 put_ebml_id(pb, elementid);
235 put_ebml_num(pb, 8, 0);
236 avio_wb64(pb, av_double2int(val));
239 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
240 const void *buf, int size)
242 put_ebml_id(pb, elementid);
243 put_ebml_num(pb, size, 0);
244 avio_write(pb, buf, size);
247 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
250 put_ebml_binary(pb, elementid, str, strlen(str));
254 * Write a void element of a given size. Useful for reserving space in
255 * the file to be written to later.
257 * @param size The number of bytes to reserve, which must be at least 2.
259 static void put_ebml_void(AVIOContext *pb, uint64_t size)
261 int64_t currentpos = avio_tell(pb);
263 av_assert0(size >= 2);
265 put_ebml_id(pb, EBML_ID_VOID);
266 // we need to subtract the length needed to store the size from the
267 // size we need to reserve so 2 cases, we use 8 bytes to store the
268 // size if possible, 1 byte otherwise
270 put_ebml_num(pb, size - 1, 0);
272 put_ebml_num(pb, size - 9, 8);
273 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
276 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
277 uint64_t expectedsize)
279 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
280 put_ebml_id(pb, elementid);
281 put_ebml_size_unknown(pb, bytes);
282 return (ebml_master) {avio_tell(pb), bytes };
285 static void end_ebml_master(AVIOContext *pb, ebml_master master)
287 int64_t pos = avio_tell(pb);
289 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
291 put_ebml_num(pb, pos - master.pos, master.sizebytes);
292 avio_seek(pb, pos, SEEK_SET);
295 static void put_xiph_size(AVIOContext *pb, int size)
297 ffio_fill(pb, 255, size / 255);
298 avio_w8(pb, size % 255);
302 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
303 * elements. If a maximum number of elements is specified, enough space
304 * will be reserved at the current file location to write a seek head of
307 * @param segment_offset The absolute offset to the position in the file
308 * where the segment begins.
309 * @param numelements The maximum number of elements that will be indexed
310 * by this seek head, 0 if unlimited.
312 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
315 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
319 new_seekhead->segment_offset = segment_offset;
321 if (numelements > 0) {
322 new_seekhead->filepos = avio_tell(pb);
323 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
324 // and size, and 3 bytes to guarantee that an EBML void element
325 // will fit afterwards
326 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
327 new_seekhead->max_entries = numelements;
328 put_ebml_void(pb, new_seekhead->reserved_size);
333 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
335 mkv_seekhead_entry *entries = seekhead->entries;
337 // don't store more elements than we reserved space for
338 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
341 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
343 return AVERROR(ENOMEM);
344 seekhead->entries = entries;
346 seekhead->entries[seekhead->num_entries].elementid = elementid;
347 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
353 * Write the seek head to the file and free it. If a maximum number of
354 * elements was specified to mkv_start_seekhead(), the seek head will
355 * be written at the location reserved for it. Otherwise, it is written
356 * at the current location in the file.
358 * @return The file offset where the seekhead was written,
359 * -1 if an error occurred.
361 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
363 ebml_master metaseek, seekentry;
367 currentpos = avio_tell(pb);
369 if (seekhead->reserved_size > 0) {
370 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
376 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
377 for (i = 0; i < seekhead->num_entries; i++) {
378 mkv_seekhead_entry *entry = &seekhead->entries[i];
380 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
382 put_ebml_id(pb, MATROSKA_ID_SEEKID);
383 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
384 put_ebml_id(pb, entry->elementid);
386 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
387 end_ebml_master(pb, seekentry);
389 end_ebml_master(pb, metaseek);
391 if (seekhead->reserved_size > 0) {
392 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
393 put_ebml_void(pb, remaining);
394 avio_seek(pb, currentpos, SEEK_SET);
396 currentpos = seekhead->filepos;
399 av_freep(&seekhead->entries);
405 static mkv_cues *mkv_start_cues(int64_t segment_offset)
407 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
411 cues->segment_offset = segment_offset;
415 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
416 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
418 mkv_cuepoint *entries = cues->entries;
423 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
425 return AVERROR(ENOMEM);
426 cues->entries = entries;
428 cues->entries[cues->num_entries].pts = ts;
429 cues->entries[cues->num_entries].stream_idx = stream;
430 cues->entries[cues->num_entries].tracknum = tracknum;
431 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
432 cues->entries[cues->num_entries].relative_pos = relative_pos;
433 cues->entries[cues->num_entries++].duration = duration;
438 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
440 AVIOContext *pb = s->pb;
441 ebml_master cues_element;
445 currentpos = avio_tell(pb);
446 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
448 for (i = 0; i < cues->num_entries; i++) {
449 ebml_master cuepoint, track_positions;
450 mkv_cuepoint *entry = &cues->entries[i];
451 uint64_t pts = entry->pts;
454 // Calculate the number of entries, so we know the element size
455 for (j = 0; j < num_tracks; j++)
456 tracks[j].has_cue = 0;
457 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
458 int tracknum = entry[j].stream_idx;
459 av_assert0(tracknum>=0 && tracknum<num_tracks);
460 if (tracks[tracknum].has_cue && s->streams[tracknum]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
462 tracks[tracknum].has_cue = 1;
466 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
467 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
469 // put all the entries from different tracks that have the exact same
470 // timestamp into the same CuePoint
471 for (j = 0; j < num_tracks; j++)
472 tracks[j].has_cue = 0;
473 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
474 int tracknum = entry[j].stream_idx;
475 av_assert0(tracknum>=0 && tracknum<num_tracks);
476 if (tracks[tracknum].has_cue && s->streams[tracknum]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
478 tracks[tracknum].has_cue = 1;
479 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
480 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
481 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
482 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
483 if (entry[j].duration != -1)
484 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
485 end_ebml_master(pb, track_positions);
488 end_ebml_master(pb, cuepoint);
490 end_ebml_master(pb, cues_element);
495 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
497 const uint8_t *header_start[3];
499 int first_header_size;
502 if (codec->codec_id == AV_CODEC_ID_VORBIS)
503 first_header_size = 30;
505 first_header_size = 42;
507 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
508 first_header_size, header_start, header_len) < 0) {
509 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
513 avio_w8(pb, 2); // number packets - 1
514 for (j = 0; j < 2; j++) {
515 put_xiph_size(pb, header_len[j]);
517 for (j = 0; j < 3; j++)
518 avio_write(pb, header_start[j], header_len[j]);
523 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
525 if (codec->extradata && codec->extradata_size == 2)
526 avio_write(pb, codec->extradata, 2);
528 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
532 static int put_flac_codecpriv(AVFormatContext *s,
533 AVIOContext *pb, AVCodecContext *codec)
535 int write_comment = (codec->channel_layout &&
536 !(codec->channel_layout & ~0x3ffffULL) &&
537 !ff_flac_is_native_layout(codec->channel_layout));
538 int ret = ff_flac_write_header(pb, codec->extradata, codec->extradata_size,
545 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
546 "Lavf" : LIBAVFORMAT_IDENT;
547 AVDictionary *dict = NULL;
548 uint8_t buf[32], *data, *p;
551 snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
552 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
554 len = ff_vorbiscomment_length(dict, vendor);
555 if (len >= ((1<<24) - 4))
556 return AVERROR(EINVAL);
558 data = av_malloc(len + 4);
561 return AVERROR(ENOMEM);
565 AV_WB24(data + 1, len);
568 ff_vorbiscomment_write(&p, &dict, vendor);
570 avio_write(pb, data, len + 4);
579 static int get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec,
580 int *sample_rate, int *output_sample_rate)
582 MPEG4AudioConfig mp4ac;
584 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
585 codec->extradata_size * 8, 1) < 0) {
586 av_log(s, AV_LOG_ERROR,
587 "Error parsing AAC extradata, unable to determine samplerate.\n");
588 return AVERROR(EINVAL);
591 *sample_rate = mp4ac.sample_rate;
592 *output_sample_rate = mp4ac.ext_sample_rate;
596 static int mkv_write_native_codecprivate(AVFormatContext *s,
597 AVCodecContext *codec,
600 switch (codec->codec_id) {
601 case AV_CODEC_ID_VORBIS:
602 case AV_CODEC_ID_THEORA:
603 return put_xiph_codecpriv(s, dyn_cp, codec);
604 case AV_CODEC_ID_FLAC:
605 return put_flac_codecpriv(s, dyn_cp, codec);
606 case AV_CODEC_ID_WAVPACK:
607 return put_wv_codecpriv(dyn_cp, codec);
608 case AV_CODEC_ID_H264:
609 return ff_isom_write_avcc(dyn_cp, codec->extradata,
610 codec->extradata_size);
611 case AV_CODEC_ID_HEVC:
612 ff_isom_write_hvcc(dyn_cp, codec->extradata,
613 codec->extradata_size, 0);
615 case AV_CODEC_ID_ALAC:
616 if (codec->extradata_size < 36) {
617 av_log(s, AV_LOG_ERROR,
618 "Invalid extradata found, ALAC expects a 36-byte "
620 return AVERROR_INVALIDDATA;
622 avio_write(dyn_cp, codec->extradata + 12,
623 codec->extradata_size - 12);
626 if (codec->codec_id == AV_CODEC_ID_PRORES &&
627 ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == AV_CODEC_ID_PRORES) {
628 avio_wl32(dyn_cp, codec->codec_tag);
629 } else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
630 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
636 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
637 AVCodecContext *codec, int native_id,
642 int ret, codecpriv_size;
644 ret = avio_open_dyn_buf(&dyn_cp);
649 ret = mkv_write_native_codecprivate(s, codec, dyn_cp);
650 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
652 if (!codec->codec_tag)
653 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
655 if (codec->extradata_size) {
656 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
657 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata + 4)) != codec->codec_id
660 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
661 avio_wl32(dyn_cp, codec->codec_tag);
662 for(i = 0; i < 0x5a - 8; i++)
665 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
668 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
669 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
670 avcodec_get_name(codec->codec_id));
672 if (!codec->codec_tag)
673 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
675 if (!codec->codec_tag && codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
676 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
677 avcodec_get_name(codec->codec_id));
678 ret = AVERROR(EINVAL);
681 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
683 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
685 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
687 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
688 avcodec_get_name(codec->codec_id));
689 ret = AVERROR(EINVAL);
691 if (!codec->codec_tag)
692 codec->codec_tag = tag;
694 ff_put_wav_header(dyn_cp, codec, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
697 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
699 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
706 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
707 AVStream *st, int mode, int *h_width, int *h_height)
711 AVDictionaryEntry *tag;
712 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
716 // convert metadata into proper side data and add it to the stream
717 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
718 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
719 int stereo_mode = atoi(tag->value);
721 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
722 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
727 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
728 stereo_mode != 10 && stereo_mode != 12) {
729 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
735 // iterate to find the stereo3d side data
736 for (i = 0; i < st->nb_side_data; i++) {
737 AVPacketSideData sd = st->side_data[i];
738 if (sd.type == AV_PKT_DATA_STEREO3D) {
739 AVStereo3D *stereo = (AVStereo3D *)sd.data;
741 switch (stereo->type) {
743 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
745 case AV_STEREO3D_SIDEBYSIDE:
746 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
747 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
748 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
751 case AV_STEREO3D_TOPBOTTOM:
752 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
753 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
757 case AV_STEREO3D_CHECKERBOARD:
758 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
759 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
762 case AV_STEREO3D_LINES:
763 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
764 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
768 case AV_STEREO3D_COLUMNS:
769 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
770 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
774 case AV_STEREO3D_FRAMESEQUENCE:
775 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
776 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
784 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
787 // if webm, do not write unsupported modes
788 if ((mode == MODE_WEBM &&
789 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
790 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
791 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
792 av_log(s, AV_LOG_ERROR,
793 "The specified stereo mode is not valid.\n");
794 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
795 return AVERROR(EINVAL);
798 // write StereoMode if format is valid
799 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
804 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
805 int i, AVIOContext *pb, int default_stream_exists)
807 AVStream *st = s->streams[i];
808 AVCodecContext *codec = st->codec;
809 ebml_master subinfo, track;
812 int bit_depth = av_get_bits_per_sample(codec->codec_id);
813 int sample_rate = codec->sample_rate;
814 int output_sample_rate = 0;
815 int display_width_div = 1;
816 int display_height_div = 1;
818 AVDictionaryEntry *tag;
820 // ms precision is the de-facto standard timescale for mkv files
821 avpriv_set_pts_info(st, 64, 1, 1000);
823 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
824 mkv->have_attachments = 1;
828 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
829 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
831 bit_depth = codec->bits_per_coded_sample;
833 if (codec->codec_id == AV_CODEC_ID_AAC) {
834 ret = get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
839 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
840 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
841 mkv->is_dash ? mkv->dash_track_number : i + 1);
842 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
843 mkv->is_dash ? mkv->dash_track_number : i + 1);
844 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
846 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
847 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
848 tag = av_dict_get(st->metadata, "language", NULL, 0);
849 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
850 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
851 } else if (tag && tag->value) {
852 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
855 // The default value for TRACKFLAGDEFAULT is 1, so add element
856 // if we need to clear it.
857 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
858 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
860 if (st->disposition & AV_DISPOSITION_FORCED)
861 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
863 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
864 const char *codec_id;
865 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
866 codec_id = "D_WEBVTT/CAPTIONS";
867 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
868 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
869 codec_id = "D_WEBVTT/DESCRIPTIONS";
870 native_id = MATROSKA_TRACK_TYPE_METADATA;
871 } else if (st->disposition & AV_DISPOSITION_METADATA) {
872 codec_id = "D_WEBVTT/METADATA";
873 native_id = MATROSKA_TRACK_TYPE_METADATA;
875 codec_id = "D_WEBVTT/SUBTITLES";
876 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
878 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
880 // look for a codec ID string specific to mkv to use,
881 // if none are found, use AVI codes
882 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
883 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
884 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
889 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->codec_tag) {
890 if (mkv->allow_raw_vfw) {
893 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
894 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
895 return AVERROR(EINVAL);
900 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->initial_padding && codec->codec_id == AV_CODEC_ID_OPUS) {
901 // mkv->tracks[i].ts_offset = av_rescale_q(codec->initial_padding,
902 // (AVRational){ 1, codec->sample_rate },
905 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
906 av_rescale_q(codec->initial_padding,
907 (AVRational){ 1, codec->sample_rate },
908 (AVRational){ 1, 1000000000 }));
910 if (codec->codec_id == AV_CODEC_ID_OPUS) {
911 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
914 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
915 codec->codec_id == AV_CODEC_ID_VP9 ||
916 codec->codec_id == AV_CODEC_ID_OPUS ||
917 codec->codec_id == AV_CODEC_ID_VORBIS ||
918 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
919 av_log(s, AV_LOG_ERROR,
920 "Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
921 return AVERROR(EINVAL);
924 switch (codec->codec_type) {
925 case AVMEDIA_TYPE_VIDEO:
926 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
928 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
929 && av_cmp_q(av_inv_q(st->avg_frame_rate), codec->time_base) > 0)
930 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
932 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * codec->time_base.num / codec->time_base.den);
935 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
936 ((!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id) && codec->codec_id != AV_CODEC_ID_RAWVIDEO) ||
937 codec->codec_id == AV_CODEC_ID_SVQ1 ||
938 codec->codec_id == AV_CODEC_ID_SVQ3 ||
939 codec->codec_id == AV_CODEC_ID_CINEPAK))
943 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
944 else if (!native_id) {
945 // if there is no mkv-specific codec ID, use VFW mode
946 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
947 mkv->tracks[i].write_dts = 1;
948 s->internal->avoid_negative_ts_use_pts = 0;
951 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
952 // XXX: interlace flag?
953 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
954 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
956 // check both side data and metadata for stereo information,
957 // write the result to the bitstream if any is found
958 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
960 &display_height_div);
964 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
965 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
966 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
967 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
970 // write DisplayWidth and DisplayHeight, they contain the size of
971 // a single source view and/or the display aspect ratio
972 if (st->sample_aspect_ratio.num) {
973 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
974 if (d_width > INT_MAX) {
975 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
976 return AVERROR(EINVAL);
978 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
979 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
980 } else if (display_width_div != 1 || display_height_div != 1) {
981 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
982 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
985 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
986 uint32_t color_space = av_le2ne32(codec->codec_tag);
987 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
990 end_ebml_master(pb, subinfo);
993 case AVMEDIA_TYPE_AUDIO:
994 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
997 // no mkv-specific ID, use ACM mode
998 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1000 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1001 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
1002 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1003 if (output_sample_rate)
1004 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1006 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1007 end_ebml_master(pb, subinfo);
1010 case AVMEDIA_TYPE_SUBTITLE:
1012 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
1013 return AVERROR(ENOSYS);
1016 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
1017 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1019 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1022 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1023 return AVERROR(EINVAL);
1026 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
1027 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
1032 end_ebml_master(pb, track);
1037 static int mkv_write_tracks(AVFormatContext *s)
1039 MatroskaMuxContext *mkv = s->priv_data;
1040 AVIOContext *pb = s->pb;
1042 int i, ret, default_stream_exists = 0;
1044 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1048 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
1049 for (i = 0; i < s->nb_streams; i++) {
1050 AVStream *st = s->streams[i];
1051 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1053 for (i = 0; i < s->nb_streams; i++) {
1054 ret = mkv_write_track(s, mkv, i, pb, default_stream_exists);
1058 end_ebml_master(pb, tracks);
1062 static int mkv_write_chapters(AVFormatContext *s)
1064 MatroskaMuxContext *mkv = s->priv_data;
1065 AVIOContext *pb = s->pb;
1066 ebml_master chapters, editionentry;
1067 AVRational scale = {1, 1E9};
1070 if (!s->nb_chapters || mkv->wrote_chapters)
1073 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1074 if (ret < 0) return ret;
1076 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
1077 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
1078 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1079 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1080 for (i = 0; i < s->nb_chapters; i++) {
1081 ebml_master chapteratom, chapterdisplay;
1082 AVChapter *c = s->chapters[i];
1083 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1084 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1085 AVDictionaryEntry *t = NULL;
1086 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1087 av_log(s, AV_LOG_ERROR,
1088 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1089 chapterstart, chapterend);
1090 return AVERROR_INVALIDDATA;
1093 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
1094 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1095 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1096 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1097 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1098 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1099 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1100 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
1101 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
1102 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
1103 end_ebml_master(pb, chapterdisplay);
1105 end_ebml_master(pb, chapteratom);
1107 end_ebml_master(pb, editionentry);
1108 end_ebml_master(pb, chapters);
1110 mkv->wrote_chapters = 1;
1114 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1116 uint8_t *key = av_strdup(t->key);
1118 const uint8_t *lang = NULL;
1122 return AVERROR(ENOMEM);
1124 if ((p = strrchr(p, '-')) &&
1125 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1132 else if (*p >= 'a' && *p <= 'z')
1137 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1138 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1140 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1141 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1142 end_ebml_master(pb, tag);
1148 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1149 unsigned int uid, ebml_master *tags)
1151 MatroskaMuxContext *mkv = s->priv_data;
1152 ebml_master tag, targets;
1153 AVDictionaryEntry *t = NULL;
1157 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1158 if (ret < 0) return ret;
1160 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
1163 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
1164 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
1166 put_ebml_uint(s->pb, elementid, uid);
1167 end_ebml_master(s->pb, targets);
1169 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1170 if (av_strcasecmp(t->key, "title") &&
1171 av_strcasecmp(t->key, "stereo_mode") &&
1172 av_strcasecmp(t->key, "encoding_tool")) {
1173 ret = mkv_write_simpletag(s->pb, t);
1179 end_ebml_master(s->pb, tag);
1183 static int mkv_check_tag(AVDictionary *m)
1185 AVDictionaryEntry *t = NULL;
1187 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1188 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
1194 static int mkv_write_tags(AVFormatContext *s)
1196 MatroskaMuxContext *mkv = s->priv_data;
1197 ebml_master tags = {0};
1200 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1202 if (mkv_check_tag(s->metadata)) {
1203 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
1204 if (ret < 0) return ret;
1207 for (i = 0; i < s->nb_streams; i++) {
1208 AVStream *st = s->streams[i];
1210 if (!mkv_check_tag(st->metadata))
1213 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
1214 if (ret < 0) return ret;
1217 for (i = 0; i < s->nb_chapters; i++) {
1218 AVChapter *ch = s->chapters[i];
1220 if (!mkv_check_tag(ch->metadata))
1223 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
1224 if (ret < 0) return ret;
1228 end_ebml_master(s->pb, tags);
1232 static int mkv_write_attachments(AVFormatContext *s)
1234 MatroskaMuxContext *mkv = s->priv_data;
1235 AVIOContext *pb = s->pb;
1236 ebml_master attachments;
1240 if (!mkv->have_attachments)
1243 av_lfg_init(&c, av_get_random_seed());
1245 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1246 if (ret < 0) return ret;
1248 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1250 for (i = 0; i < s->nb_streams; i++) {
1251 AVStream *st = s->streams[i];
1252 ebml_master attached_file;
1253 AVDictionaryEntry *t;
1254 const char *mimetype = NULL;
1257 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1260 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1262 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1263 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1264 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1265 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1266 return AVERROR(EINVAL);
1268 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1269 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1270 mimetype = t->value;
1271 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1273 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1274 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1275 mimetype = ff_mkv_mime_tags[i].str;
1278 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1279 if (ff_mkv_image_mime_tags[i].id == st->codec->codec_id) {
1280 mimetype = ff_mkv_image_mime_tags[i].str;
1285 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1286 "it cannot be deduced from the codec id.\n", i);
1287 return AVERROR(EINVAL);
1290 if (s->flags & AVFMT_FLAG_BITEXACT) {
1291 struct AVSHA *sha = av_sha_alloc();
1294 return AVERROR(ENOMEM);
1295 av_sha_init(sha, 160);
1296 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1297 av_sha_final(sha, digest);
1299 fileuid = AV_RL64(digest);
1301 fileuid = av_lfg_get(&c);
1303 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1306 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1307 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1308 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1309 end_ebml_master(pb, attached_file);
1311 end_ebml_master(pb, attachments);
1316 static int mkv_write_header(AVFormatContext *s)
1318 MatroskaMuxContext *mkv = s->priv_data;
1319 AVIOContext *pb = s->pb;
1320 ebml_master ebml_header, segment_info;
1321 AVDictionaryEntry *tag;
1322 int ret, i, version = 2;
1324 if (!strcmp(s->oformat->name, "webm"))
1325 mkv->mode = MODE_WEBM;
1327 mkv->mode = MODE_MATROSKAv2;
1329 if (s->avoid_negative_ts < 0) {
1330 s->avoid_negative_ts = 1;
1331 s->internal->avoid_negative_ts_use_pts = 1;
1334 if (mkv->mode != MODE_WEBM ||
1335 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1336 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1339 for (i = 0; i < s->nb_streams; i++) {
1340 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1341 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1342 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1343 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1344 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1345 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1346 av_log(s, AV_LOG_ERROR,
1347 "The Matroska muxer does not yet support muxing %s\n",
1348 avcodec_get_name(s->streams[i]->codec->codec_id));
1349 return AVERROR_PATCHWELCOME;
1351 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_OPUS ||
1352 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1353 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1357 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1359 return AVERROR(ENOMEM);
1361 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1362 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1363 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1364 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1365 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1366 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1367 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1368 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1369 end_ebml_master(pb, ebml_header);
1371 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1372 mkv->segment_offset = avio_tell(pb);
1374 // we write 2 seek heads - one at the end of the file to point to each
1375 // cluster, and one at the beginning to point to all other level one
1376 // elements (including the seek head at the end of the file), which
1377 // isn't more than 10 elements if we only write one of each other
1378 // currently defined level 1 element
1379 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1380 if (!mkv->main_seekhead)
1381 return AVERROR(ENOMEM);
1383 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1384 if (ret < 0) return ret;
1386 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1387 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1388 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1389 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1390 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1391 uint32_t segment_uid[4];
1394 av_lfg_init(&lfg, av_get_random_seed());
1396 for (i = 0; i < 4; i++)
1397 segment_uid[i] = av_lfg_get(&lfg);
1399 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1400 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1401 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1403 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1404 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1406 const char *ident = "Lavf";
1407 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1408 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1411 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1412 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1413 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1414 uint8_t date_utc_buf[8];
1415 AV_WB64(date_utc_buf, date_utc);
1416 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1419 // reserve space for the duration
1421 mkv->duration_offset = avio_tell(pb);
1422 if (!mkv->is_live) {
1423 put_ebml_void(pb, 11); // assumes double-precision float to be written
1425 end_ebml_master(pb, segment_info);
1427 ret = mkv_write_tracks(s);
1431 for (i = 0; i < s->nb_chapters; i++)
1432 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1434 if (mkv->mode != MODE_WEBM) {
1435 ret = mkv_write_chapters(s);
1439 ret = mkv_write_tags(s);
1443 ret = mkv_write_attachments(s);
1448 if (!s->pb->seekable && !mkv->is_live)
1449 mkv_write_seekhead(pb, mkv->main_seekhead);
1451 mkv->cues = mkv_start_cues(mkv->segment_offset);
1453 return AVERROR(ENOMEM);
1455 if (pb->seekable && mkv->reserve_cues_space) {
1456 mkv->cues_pos = avio_tell(pb);
1457 put_ebml_void(pb, mkv->reserve_cues_space);
1460 av_init_packet(&mkv->cur_audio_pkt);
1461 mkv->cur_audio_pkt.size = 0;
1462 mkv->cluster_pos = -1;
1466 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1467 // after 4k and on a keyframe
1469 if (mkv->cluster_time_limit < 0)
1470 mkv->cluster_time_limit = 5000;
1471 if (mkv->cluster_size_limit < 0)
1472 mkv->cluster_size_limit = 5 * 1024 * 1024;
1474 if (mkv->cluster_time_limit < 0)
1475 mkv->cluster_time_limit = 1000;
1476 if (mkv->cluster_size_limit < 0)
1477 mkv->cluster_size_limit = 32 * 1024;
1483 static int mkv_blockgroup_size(int pkt_size)
1485 int size = pkt_size + 4;
1486 size += ebml_num_size(size);
1487 size += 2; // EBML ID for block and block duration
1488 size += 8; // max size of block duration
1489 size += ebml_num_size(size);
1490 size += 1; // blockgroup EBML ID
1494 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1501 dst = av_malloc(srclen);
1503 return AVERROR(ENOMEM);
1505 while (srclen >= WV_HEADER_SIZE) {
1508 ret = ff_wv_parse_header(&header, src);
1511 src += WV_HEADER_SIZE;
1512 srclen -= WV_HEADER_SIZE;
1514 if (srclen < header.blocksize) {
1515 ret = AVERROR_INVALIDDATA;
1519 if (header.initial) {
1520 AV_WL32(dst + offset, header.samples);
1523 AV_WL32(dst + offset, header.flags);
1524 AV_WL32(dst + offset + 4, header.crc);
1527 if (!(header.initial && header.final)) {
1528 AV_WL32(dst + offset, header.blocksize);
1532 memcpy(dst + offset, src, header.blocksize);
1533 src += header.blocksize;
1534 srclen -= header.blocksize;
1535 offset += header.blocksize;
1547 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1548 unsigned int blockid, AVPacket *pkt, int flags)
1550 MatroskaMuxContext *mkv = s->priv_data;
1551 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1552 uint8_t *data = NULL, *side_data = NULL;
1553 int offset = 0, size = pkt->size, side_data_size = 0;
1554 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1555 uint64_t additional_id = 0;
1556 int64_t discard_padding = 0;
1557 ebml_master block_group, block_additions, block_more;
1559 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1560 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1561 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1562 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1563 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1564 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1565 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1566 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1567 /* extradata is Annex B, assume the bitstream is too and convert it */
1568 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1569 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1570 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1572 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1578 if (codec->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
1579 /* Matroska specification requires to remove the first QuickTime atom
1585 side_data = av_packet_get_side_data(pkt,
1586 AV_PKT_DATA_SKIP_SAMPLES,
1589 if (side_data && side_data_size >= 10) {
1590 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1591 (AVRational){1, codec->sample_rate},
1592 (AVRational){1, 1000000000});
1595 side_data = av_packet_get_side_data(pkt,
1596 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1599 additional_id = AV_RB64(side_data);
1601 side_data_size -= 8;
1604 if ((side_data_size && additional_id == 1) || discard_padding) {
1605 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1606 blockid = MATROSKA_ID_BLOCK;
1609 put_ebml_id(pb, blockid);
1610 put_ebml_num(pb, size + 4, 0);
1611 // this assumes stream_index is less than 126
1612 avio_w8(pb, 0x80 | (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1)));
1613 avio_wb16(pb, ts - mkv->cluster_pts);
1615 avio_write(pb, data + offset, size);
1616 if (data != pkt->data)
1619 if (discard_padding) {
1620 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1623 if (side_data_size && additional_id == 1) {
1624 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1625 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1626 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1627 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1628 put_ebml_num(pb, side_data_size, 0);
1629 avio_write(pb, side_data, side_data_size);
1630 end_ebml_master(pb, block_more);
1631 end_ebml_master(pb, block_additions);
1633 if ((side_data_size && additional_id == 1) || discard_padding) {
1634 end_ebml_master(pb, block_group);
1638 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1640 MatroskaMuxContext *mkv = s->priv_data;
1641 ebml_master blockgroup;
1642 int id_size, settings_size, size;
1643 uint8_t *id, *settings;
1644 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1645 const int flags = 0;
1648 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1652 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1655 size = id_size + 1 + settings_size + 1 + pkt->size;
1657 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1658 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1659 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1661 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1663 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1664 put_ebml_num(pb, size + 4, 0);
1665 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1666 avio_wb16(pb, ts - mkv->cluster_pts);
1668 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1670 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1671 end_ebml_master(pb, blockgroup);
1673 return pkt->duration;
1676 static void mkv_flush_dynbuf(AVFormatContext *s)
1678 MatroskaMuxContext *mkv = s->priv_data;
1685 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1686 avio_write(s->pb, dyn_buf, bufsize);
1691 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
1693 MatroskaMuxContext *mkv = s->priv_data;
1696 if (s->pb->seekable) {
1702 av_log(s, AV_LOG_DEBUG,
1703 "Starting new cluster at offset %" PRIu64 " bytes, "
1704 "pts %" PRIu64 "dts %" PRIu64 "\n",
1705 avio_tell(pb), pkt->pts, pkt->dts);
1706 end_ebml_master(pb, mkv->cluster);
1707 mkv->cluster_pos = -1;
1709 mkv_flush_dynbuf(s);
1713 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
1715 MatroskaMuxContext *mkv = s->priv_data;
1716 AVIOContext *pb = s->pb;
1717 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1718 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1719 int duration = pkt->duration;
1721 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1722 int64_t relative_packet_pos;
1723 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
1725 if (ts == AV_NOPTS_VALUE) {
1726 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1727 return AVERROR(EINVAL);
1729 ts += mkv->tracks[pkt->stream_index].ts_offset;
1731 if (mkv->cluster_pos != -1) {
1732 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
1733 if ((int16_t)cluster_time != cluster_time) {
1734 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
1735 mkv_start_new_cluster(s, pkt);
1739 if (!s->pb->seekable) {
1741 ret = avio_open_dyn_buf(&mkv->dyn_bc);
1743 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1750 if (mkv->cluster_pos == -1) {
1751 mkv->cluster_pos = avio_tell(s->pb);
1752 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1753 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1754 mkv->cluster_pts = FFMAX(0, ts);
1757 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1759 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1760 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1761 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue) {
1762 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
1763 if (ret < 0) return ret;
1766 if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1767 duration = mkv_write_vtt_blocks(s, pb, pkt);
1769 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1770 mkv_blockgroup_size(pkt->size));
1771 /* For backward compatibility, prefer convergence_duration. */
1772 if (pkt->convergence_duration > 0) {
1773 duration = pkt->convergence_duration;
1775 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1776 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1777 end_ebml_master(pb, blockgroup);
1780 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
1781 mkv->cluster_pos, relative_packet_pos, duration);
1786 mkv->duration = FFMAX(mkv->duration, ts + duration);
1790 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1792 MatroskaMuxContext *mkv = s->priv_data;
1793 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1794 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1796 int64_t cluster_time;
1798 int start_new_cluster;
1800 if (mkv->tracks[pkt->stream_index].write_dts)
1801 cluster_time = pkt->dts - mkv->cluster_pts;
1803 cluster_time = pkt->pts - mkv->cluster_pts;
1804 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1806 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1807 // after 4k and on a keyframe
1808 if (s->pb->seekable) {
1809 cluster_size = avio_tell(s->pb) - mkv->cluster_pos;
1811 cluster_size = avio_tell(mkv->dyn_bc);
1814 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
1815 // WebM DASH specification states that the first block of every cluster
1816 // has to be a key frame. So for DASH video, we only create a cluster
1817 // on seeing key frames.
1818 start_new_cluster = keyframe;
1819 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
1820 (mkv->cluster_pos == -1 ||
1821 cluster_time > mkv->cluster_time_limit)) {
1822 // For DASH audio, we create a Cluster based on cluster_time_limit
1823 start_new_cluster = 1;
1824 } else if (!mkv->is_dash &&
1825 (cluster_size > mkv->cluster_size_limit ||
1826 cluster_time > mkv->cluster_time_limit ||
1827 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1828 cluster_size > 4 * 1024))) {
1829 start_new_cluster = 1;
1831 start_new_cluster = 0;
1834 if (mkv->cluster_pos != -1 && start_new_cluster) {
1835 mkv_start_new_cluster(s, pkt);
1838 // check if we have an audio packet cached
1839 if (mkv->cur_audio_pkt.size > 0) {
1840 // for DASH audio, a CuePoint has to be added when there is a new cluster.
1841 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
1842 mkv->is_dash ? start_new_cluster : 0);
1843 av_free_packet(&mkv->cur_audio_pkt);
1845 av_log(s, AV_LOG_ERROR,
1846 "Could not write cached audio packet ret:%d\n", ret);
1851 // buffer an audio packet to ensure the packet containing the video
1852 // keyframe's timecode is contained in the same cluster for WebM
1853 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1854 mkv->cur_audio_pkt = *pkt;
1856 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1857 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1859 ret = av_dup_packet(&mkv->cur_audio_pkt);
1860 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1861 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1864 ret = mkv_write_packet_internal(s, pkt, 0);
1868 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1870 MatroskaMuxContext *mkv = s->priv_data;
1872 if (s->pb->seekable)
1877 if (mkv->cluster_pos != -1) {
1878 av_log(s, AV_LOG_DEBUG,
1879 "Flushing cluster at offset %" PRIu64 " bytes\n",
1881 end_ebml_master(pb, mkv->cluster);
1882 mkv->cluster_pos = -1;
1884 mkv_flush_dynbuf(s);
1889 return mkv_write_packet(s, pkt);
1892 static int mkv_write_trailer(AVFormatContext *s)
1894 MatroskaMuxContext *mkv = s->priv_data;
1895 AVIOContext *pb = s->pb;
1896 int64_t currentpos, cuespos;
1899 // check if we have an audio packet cached
1900 if (mkv->cur_audio_pkt.size > 0) {
1901 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
1902 av_free_packet(&mkv->cur_audio_pkt);
1904 av_log(s, AV_LOG_ERROR,
1905 "Could not write cached audio packet ret:%d\n", ret);
1911 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1912 mkv_flush_dynbuf(s);
1913 } else if (mkv->cluster_pos != -1) {
1914 end_ebml_master(pb, mkv->cluster);
1917 if (mkv->mode != MODE_WEBM) {
1918 ret = mkv_write_chapters(s);
1924 if (mkv->cues->num_entries) {
1925 if (mkv->reserve_cues_space) {
1928 currentpos = avio_tell(pb);
1929 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1931 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
1932 cues_end = avio_tell(pb);
1933 if (cues_end > cuespos + mkv->reserve_cues_space) {
1934 av_log(s, AV_LOG_ERROR,
1935 "Insufficient space reserved for cues: %d "
1936 "(needed: %" PRId64 ").\n",
1937 mkv->reserve_cues_space, cues_end - cuespos);
1938 return AVERROR(EINVAL);
1941 if (cues_end < cuespos + mkv->reserve_cues_space)
1942 put_ebml_void(pb, mkv->reserve_cues_space -
1943 (cues_end - cuespos));
1945 avio_seek(pb, currentpos, SEEK_SET);
1947 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
1950 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
1956 mkv_write_seekhead(pb, mkv->main_seekhead);
1958 // update the duration
1959 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1960 currentpos = avio_tell(pb);
1961 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1962 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1964 avio_seek(pb, currentpos, SEEK_SET);
1967 if (!mkv->is_live) {
1968 end_ebml_master(pb, mkv->segment);
1970 av_freep(&mkv->tracks);
1971 av_freep(&mkv->cues->entries);
1972 av_freep(&mkv->cues);
1977 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1980 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1981 if (ff_mkv_codec_tags[i].id == codec_id)
1984 if (std_compliance < FF_COMPLIANCE_NORMAL) {
1985 enum AVMediaType type = avcodec_get_type(codec_id);
1986 // mkv theoretically supports any video/audio through VFW/ACM
1987 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1994 static const AVCodecTag additional_audio_tags[] = {
1995 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1996 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1997 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1998 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1999 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2000 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2001 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2002 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2003 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2004 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2005 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2006 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2007 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2010 static const AVCodecTag additional_video_tags[] = {
2011 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2012 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2013 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2014 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
2015 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
2016 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2019 static const AVCodecTag additional_subtitle_tags[] = {
2020 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2021 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2022 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2025 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2026 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2027 static const AVOption options[] = {
2028 { "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 },
2029 { "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 },
2030 { "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 },
2031 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
2032 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2033 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
2034 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
2038 #if CONFIG_MATROSKA_MUXER
2039 static const AVClass matroska_class = {
2040 .class_name = "matroska muxer",
2041 .item_name = av_default_item_name,
2043 .version = LIBAVUTIL_VERSION_INT,
2046 AVOutputFormat ff_matroska_muxer = {
2048 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2049 .mime_type = "video/x-matroska",
2050 .extensions = "mkv",
2051 .priv_data_size = sizeof(MatroskaMuxContext),
2052 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2053 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2054 .video_codec = CONFIG_LIBX264_ENCODER ?
2055 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2056 .write_header = mkv_write_header,
2057 .write_packet = mkv_write_flush_packet,
2058 .write_trailer = mkv_write_trailer,
2059 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2060 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2061 .codec_tag = (const AVCodecTag* const []){
2062 ff_codec_bmp_tags, ff_codec_wav_tags,
2063 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2065 .subtitle_codec = AV_CODEC_ID_ASS,
2066 .query_codec = mkv_query_codec,
2067 .priv_class = &matroska_class,
2071 #if CONFIG_WEBM_MUXER
2072 static const AVClass webm_class = {
2073 .class_name = "webm muxer",
2074 .item_name = av_default_item_name,
2076 .version = LIBAVUTIL_VERSION_INT,
2079 AVOutputFormat ff_webm_muxer = {
2081 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2082 .mime_type = "video/webm",
2083 .extensions = "webm",
2084 .priv_data_size = sizeof(MatroskaMuxContext),
2085 .audio_codec = AV_CODEC_ID_VORBIS,
2086 .video_codec = AV_CODEC_ID_VP8,
2087 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2088 .write_header = mkv_write_header,
2089 .write_packet = mkv_write_flush_packet,
2090 .write_trailer = mkv_write_trailer,
2091 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2092 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2093 .priv_class = &webm_class,
2097 #if CONFIG_MATROSKA_AUDIO_MUXER
2098 static const AVClass mka_class = {
2099 .class_name = "matroska audio muxer",
2100 .item_name = av_default_item_name,
2102 .version = LIBAVUTIL_VERSION_INT,
2104 AVOutputFormat ff_matroska_audio_muxer = {
2106 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2107 .mime_type = "audio/x-matroska",
2108 .extensions = "mka",
2109 .priv_data_size = sizeof(MatroskaMuxContext),
2110 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2111 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2112 .video_codec = AV_CODEC_ID_NONE,
2113 .write_header = mkv_write_header,
2114 .write_packet = mkv_write_flush_packet,
2115 .write_trailer = mkv_write_trailer,
2116 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2118 .codec_tag = (const AVCodecTag* const []){
2119 ff_codec_wav_tags, additional_audio_tags, 0
2121 .priv_class = &mka_class,