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/rational.h"
48 #include "libavutil/samplefmt.h"
49 #include "libavutil/sha.h"
50 #include "libavutil/stereo3d.h"
52 #include "libavcodec/xiph.h"
53 #include "libavcodec/mpeg4audio.h"
54 #include "libavcodec/internal.h"
56 typedef struct ebml_master {
57 int64_t pos; ///< absolute offset in the file where the master's elements start
58 int sizebytes; ///< how many bytes were reserved for the size
61 typedef struct mkv_seekhead_entry {
62 unsigned int elementid;
66 typedef struct mkv_seekhead {
68 int64_t segment_offset; ///< the file offset to the beginning of the segment
69 int reserved_size; ///< -1 if appending to file
71 mkv_seekhead_entry *entries;
75 typedef struct mkv_cuepoint {
79 int64_t cluster_pos; ///< file offset of the cluster containing the block
80 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
81 int64_t duration; ///< duration of the block according to time base
84 typedef struct mkv_cues {
85 int64_t segment_offset;
86 mkv_cuepoint *entries;
90 typedef struct mkv_track {
96 #define MODE_MATROSKAv2 0x01
97 #define MODE_WEBM 0x02
99 /** Maximum number of tracks allowed in a Matroska file (with track numbers in
100 * range 1 to 126 (inclusive) */
101 #define MAX_TRACKS 126
103 typedef struct MatroskaMuxContext {
104 const AVClass *class;
108 int64_t segment_offset;
110 int64_t cluster_pos; ///< file offset of the current cluster
112 int64_t duration_offset;
114 mkv_seekhead *main_seekhead;
118 AVPacket cur_audio_pkt;
120 int have_attachments;
122 int reserve_cues_space;
123 int cluster_size_limit;
125 int64_t cluster_time_limit;
127 int dash_track_number;
130 uint32_t chapter_id_offset;
133 int64_t last_track_timestamp[MAX_TRACKS];
135 int64_t* stream_durations;
136 int64_t* stream_duration_offsets;
139 } MatroskaMuxContext;
142 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
143 * offset, 4 bytes for target EBML ID */
144 #define MAX_SEEKENTRY_SIZE 21
146 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
148 #define MAX_CUETRACKPOS_SIZE 42
150 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
151 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
153 /** Seek preroll value for opus */
154 #define OPUS_SEEK_PREROLL 80000000
156 static int ebml_id_size(unsigned int id)
158 return (av_log2(id + 1) - 1) / 7 + 1;
161 static void put_ebml_id(AVIOContext *pb, unsigned int id)
163 int i = ebml_id_size(id);
165 avio_w8(pb, (uint8_t)(id >> (i * 8)));
169 * Write an EBML size meaning "unknown size".
171 * @param bytes The number of bytes the size should occupy (maximum: 8).
173 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
175 av_assert0(bytes <= 8);
176 avio_w8(pb, 0x1ff >> bytes);
177 ffio_fill(pb, 0xff, bytes - 1);
181 * Calculate how many bytes are needed to represent a given number in EBML.
183 static int ebml_num_size(uint64_t num)
186 while ((num + 1) >> bytes * 7)
192 * Write a number in EBML variable length format.
194 * @param bytes The number of bytes that need to be used to write the number.
195 * If zero, any number of bytes can be used.
197 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
199 int i, needed_bytes = ebml_num_size(num);
201 // sizes larger than this are currently undefined in EBML
202 av_assert0(num < (1ULL << 56) - 1);
205 // don't care how many bytes are used, so use the min
206 bytes = needed_bytes;
207 // the bytes needed to write the given size would exceed the bytes
208 // that we need to use, so write unknown size. This shouldn't happen.
209 av_assert0(bytes >= needed_bytes);
211 num |= 1ULL << bytes * 7;
212 for (i = bytes - 1; i >= 0; i--)
213 avio_w8(pb, (uint8_t)(num >> i * 8));
216 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
223 put_ebml_id(pb, elementid);
224 put_ebml_num(pb, bytes, 0);
225 for (i = bytes - 1; i >= 0; i--)
226 avio_w8(pb, (uint8_t)(val >> i * 8));
229 static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
232 uint64_t tmp = 2*(val < 0 ? val^-1 : val);
234 while (tmp>>=8) bytes++;
236 put_ebml_id(pb, elementid);
237 put_ebml_num(pb, bytes, 0);
238 for (i = bytes - 1; i >= 0; i--)
239 avio_w8(pb, (uint8_t)(val >> i * 8));
242 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
244 put_ebml_id(pb, elementid);
245 put_ebml_num(pb, 8, 0);
246 avio_wb64(pb, av_double2int(val));
249 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
250 const void *buf, int size)
252 put_ebml_id(pb, elementid);
253 put_ebml_num(pb, size, 0);
254 avio_write(pb, buf, size);
257 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
260 put_ebml_binary(pb, elementid, str, strlen(str));
264 * Write a void element of a given size. Useful for reserving space in
265 * the file to be written to later.
267 * @param size The number of bytes to reserve, which must be at least 2.
269 static void put_ebml_void(AVIOContext *pb, uint64_t size)
271 int64_t currentpos = avio_tell(pb);
273 av_assert0(size >= 2);
275 put_ebml_id(pb, EBML_ID_VOID);
276 // we need to subtract the length needed to store the size from the
277 // size we need to reserve so 2 cases, we use 8 bytes to store the
278 // size if possible, 1 byte otherwise
280 put_ebml_num(pb, size - 1, 0);
282 put_ebml_num(pb, size - 9, 8);
283 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
286 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
287 uint64_t expectedsize)
289 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
290 put_ebml_id(pb, elementid);
291 put_ebml_size_unknown(pb, bytes);
292 return (ebml_master) {avio_tell(pb), bytes };
295 static void end_ebml_master(AVIOContext *pb, ebml_master master)
297 int64_t pos = avio_tell(pb);
299 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
301 put_ebml_num(pb, pos - master.pos, master.sizebytes);
302 avio_seek(pb, pos, SEEK_SET);
305 static void put_xiph_size(AVIOContext *pb, int size)
307 ffio_fill(pb, 255, size / 255);
308 avio_w8(pb, size % 255);
312 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
313 * elements. If a maximum number of elements is specified, enough space
314 * will be reserved at the current file location to write a seek head of
317 * @param segment_offset The absolute offset to the position in the file
318 * where the segment begins.
319 * @param numelements The maximum number of elements that will be indexed
320 * by this seek head, 0 if unlimited.
322 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
325 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
329 new_seekhead->segment_offset = segment_offset;
331 if (numelements > 0) {
332 new_seekhead->filepos = avio_tell(pb);
333 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
334 // and size, and 3 bytes to guarantee that an EBML void element
335 // will fit afterwards
336 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
337 new_seekhead->max_entries = numelements;
338 put_ebml_void(pb, new_seekhead->reserved_size);
343 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
345 mkv_seekhead_entry *entries = seekhead->entries;
347 // don't store more elements than we reserved space for
348 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
351 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
353 return AVERROR(ENOMEM);
354 seekhead->entries = entries;
356 seekhead->entries[seekhead->num_entries].elementid = elementid;
357 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
363 * Write the seek head to the file and free it. If a maximum number of
364 * elements was specified to mkv_start_seekhead(), the seek head will
365 * be written at the location reserved for it. Otherwise, it is written
366 * at the current location in the file.
368 * @return The file offset where the seekhead was written,
369 * -1 if an error occurred.
371 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
373 ebml_master metaseek, seekentry;
377 currentpos = avio_tell(pb);
379 if (seekhead->reserved_size > 0) {
380 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
386 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
387 for (i = 0; i < seekhead->num_entries; i++) {
388 mkv_seekhead_entry *entry = &seekhead->entries[i];
390 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
392 put_ebml_id(pb, MATROSKA_ID_SEEKID);
393 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
394 put_ebml_id(pb, entry->elementid);
396 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
397 end_ebml_master(pb, seekentry);
399 end_ebml_master(pb, metaseek);
401 if (seekhead->reserved_size > 0) {
402 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
403 put_ebml_void(pb, remaining);
404 avio_seek(pb, currentpos, SEEK_SET);
406 currentpos = seekhead->filepos;
409 av_freep(&seekhead->entries);
415 static mkv_cues *mkv_start_cues(int64_t segment_offset)
417 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
421 cues->segment_offset = segment_offset;
425 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
426 int64_t cluster_pos, int64_t relative_pos, int64_t duration)
428 mkv_cuepoint *entries = cues->entries;
433 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
435 return AVERROR(ENOMEM);
436 cues->entries = entries;
438 cues->entries[cues->num_entries].pts = ts;
439 cues->entries[cues->num_entries].stream_idx = stream;
440 cues->entries[cues->num_entries].tracknum = tracknum;
441 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
442 cues->entries[cues->num_entries].relative_pos = relative_pos;
443 cues->entries[cues->num_entries++].duration = duration;
448 static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
450 AVIOContext *pb = s->pb;
451 ebml_master cues_element;
455 currentpos = avio_tell(pb);
456 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
458 for (i = 0; i < cues->num_entries; i++) {
459 ebml_master cuepoint, track_positions;
460 mkv_cuepoint *entry = &cues->entries[i];
461 uint64_t pts = entry->pts;
464 // Calculate the number of entries, so we know the element size
465 for (j = 0; j < num_tracks; j++)
466 tracks[j].has_cue = 0;
467 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
468 int tracknum = entry[j].stream_idx;
469 av_assert0(tracknum>=0 && tracknum<num_tracks);
470 if (tracks[tracknum].has_cue && s->streams[tracknum]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
472 tracks[tracknum].has_cue = 1;
476 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
477 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
479 // put all the entries from different tracks that have the exact same
480 // timestamp into the same CuePoint
481 for (j = 0; j < num_tracks; j++)
482 tracks[j].has_cue = 0;
483 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
484 int tracknum = entry[j].stream_idx;
485 av_assert0(tracknum>=0 && tracknum<num_tracks);
486 if (tracks[tracknum].has_cue && s->streams[tracknum]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
488 tracks[tracknum].has_cue = 1;
489 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
490 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
491 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
492 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
493 if (entry[j].duration != -1)
494 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
495 end_ebml_master(pb, track_positions);
498 end_ebml_master(pb, cuepoint);
500 end_ebml_master(pb, cues_element);
505 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
507 const uint8_t *header_start[3];
509 int first_header_size;
512 if (codec->codec_id == AV_CODEC_ID_VORBIS)
513 first_header_size = 30;
515 first_header_size = 42;
517 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
518 first_header_size, header_start, header_len) < 0) {
519 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
523 avio_w8(pb, 2); // number packets - 1
524 for (j = 0; j < 2; j++) {
525 put_xiph_size(pb, header_len[j]);
527 for (j = 0; j < 3; j++)
528 avio_write(pb, header_start[j], header_len[j]);
533 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
535 if (codec->extradata && codec->extradata_size == 2)
536 avio_write(pb, codec->extradata, 2);
538 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
542 static int put_flac_codecpriv(AVFormatContext *s,
543 AVIOContext *pb, AVCodecContext *codec)
545 int write_comment = (codec->channel_layout &&
546 !(codec->channel_layout & ~0x3ffffULL) &&
547 !ff_flac_is_native_layout(codec->channel_layout));
548 int ret = ff_flac_write_header(pb, codec->extradata, codec->extradata_size,
555 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
556 "Lavf" : LIBAVFORMAT_IDENT;
557 AVDictionary *dict = NULL;
558 uint8_t buf[32], *data, *p;
561 snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
562 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
564 len = ff_vorbiscomment_length(dict, vendor);
565 if (len >= ((1<<24) - 4))
566 return AVERROR(EINVAL);
568 data = av_malloc(len + 4);
571 return AVERROR(ENOMEM);
575 AV_WB24(data + 1, len);
578 ff_vorbiscomment_write(&p, &dict, vendor);
580 avio_write(pb, data, len + 4);
589 static int get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec,
590 int *sample_rate, int *output_sample_rate)
592 MPEG4AudioConfig mp4ac;
594 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
595 codec->extradata_size * 8, 1) < 0) {
596 av_log(s, AV_LOG_ERROR,
597 "Error parsing AAC extradata, unable to determine samplerate.\n");
598 return AVERROR(EINVAL);
601 *sample_rate = mp4ac.sample_rate;
602 *output_sample_rate = mp4ac.ext_sample_rate;
606 static int mkv_write_native_codecprivate(AVFormatContext *s,
607 AVCodecContext *codec,
610 switch (codec->codec_id) {
611 case AV_CODEC_ID_VORBIS:
612 case AV_CODEC_ID_THEORA:
613 return put_xiph_codecpriv(s, dyn_cp, codec);
614 case AV_CODEC_ID_FLAC:
615 return put_flac_codecpriv(s, dyn_cp, codec);
616 case AV_CODEC_ID_WAVPACK:
617 return put_wv_codecpriv(dyn_cp, codec);
618 case AV_CODEC_ID_H264:
619 return ff_isom_write_avcc(dyn_cp, codec->extradata,
620 codec->extradata_size);
621 case AV_CODEC_ID_HEVC:
622 ff_isom_write_hvcc(dyn_cp, codec->extradata,
623 codec->extradata_size, 0);
625 case AV_CODEC_ID_ALAC:
626 if (codec->extradata_size < 36) {
627 av_log(s, AV_LOG_ERROR,
628 "Invalid extradata found, ALAC expects a 36-byte "
630 return AVERROR_INVALIDDATA;
632 avio_write(dyn_cp, codec->extradata + 12,
633 codec->extradata_size - 12);
636 if (codec->codec_id == AV_CODEC_ID_PRORES &&
637 ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == AV_CODEC_ID_PRORES) {
638 avio_wl32(dyn_cp, codec->codec_tag);
639 } else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
640 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
646 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
647 AVCodecContext *codec, int native_id,
652 int ret, codecpriv_size;
654 ret = avio_open_dyn_buf(&dyn_cp);
659 ret = mkv_write_native_codecprivate(s, codec, dyn_cp);
660 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
662 if (!codec->codec_tag)
663 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
665 if (codec->extradata_size) {
666 if ( ff_codec_get_id(ff_codec_movvideo_tags, codec->codec_tag) == codec->codec_id
667 && ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(codec->extradata + 4)) != codec->codec_id
670 avio_wb32(dyn_cp, 0x5a + codec->extradata_size);
671 avio_wl32(dyn_cp, codec->codec_tag);
672 for(i = 0; i < 0x5a - 8; i++)
675 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
678 if (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id))
679 av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
680 avcodec_get_name(codec->codec_id));
682 if (!codec->codec_tag)
683 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
685 if (!codec->codec_tag && codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
686 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
687 avcodec_get_name(codec->codec_id));
688 ret = AVERROR(EINVAL);
691 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0, 0);
693 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
695 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
697 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
698 avcodec_get_name(codec->codec_id));
699 ret = AVERROR(EINVAL);
701 if (!codec->codec_tag)
702 codec->codec_tag = tag;
704 ff_put_wav_header(dyn_cp, codec, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
707 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
709 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
716 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
717 AVStream *st, int mode, int *h_width, int *h_height)
721 AVDictionaryEntry *tag;
722 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
726 // convert metadata into proper side data and add it to the stream
727 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
728 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
729 int stereo_mode = atoi(tag->value);
731 for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
732 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
737 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
738 stereo_mode != 10 && stereo_mode != 12) {
739 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
745 // iterate to find the stereo3d side data
746 for (i = 0; i < st->nb_side_data; i++) {
747 AVPacketSideData sd = st->side_data[i];
748 if (sd.type == AV_PKT_DATA_STEREO3D) {
749 AVStereo3D *stereo = (AVStereo3D *)sd.data;
751 switch (stereo->type) {
753 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
755 case AV_STEREO3D_SIDEBYSIDE:
756 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
757 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
758 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
761 case AV_STEREO3D_TOPBOTTOM:
762 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
763 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
767 case AV_STEREO3D_CHECKERBOARD:
768 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
769 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
772 case AV_STEREO3D_LINES:
773 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
774 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
778 case AV_STEREO3D_COLUMNS:
779 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
780 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
784 case AV_STEREO3D_FRAMESEQUENCE:
785 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
786 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
794 if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
797 // if webm, do not write unsupported modes
798 if ((mode == MODE_WEBM &&
799 format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
800 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
801 || format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
802 av_log(s, AV_LOG_ERROR,
803 "The specified stereo mode is not valid.\n");
804 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
805 return AVERROR(EINVAL);
808 // write StereoMode if format is valid
809 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
814 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
815 int i, AVIOContext *pb, int default_stream_exists)
817 AVStream *st = s->streams[i];
818 AVCodecContext *codec = st->codec;
819 ebml_master subinfo, track;
822 int bit_depth = av_get_bits_per_sample(codec->codec_id);
823 int sample_rate = codec->sample_rate;
824 int output_sample_rate = 0;
825 int display_width_div = 1;
826 int display_height_div = 1;
828 AVDictionaryEntry *tag;
830 // ms precision is the de-facto standard timescale for mkv files
831 avpriv_set_pts_info(st, 64, 1, 1000);
833 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
834 mkv->have_attachments = 1;
838 if (!bit_depth && codec->codec_id != AV_CODEC_ID_ADPCM_G726)
839 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
841 bit_depth = codec->bits_per_coded_sample;
843 if (codec->codec_id == AV_CODEC_ID_AAC) {
844 ret = get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
849 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
850 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
851 mkv->is_dash ? mkv->dash_track_number : i + 1);
852 put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
853 mkv->is_dash ? mkv->dash_track_number : i + 1);
854 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
856 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
857 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
858 tag = av_dict_get(st->metadata, "language", NULL, 0);
859 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
860 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
861 } else if (tag && tag->value) {
862 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
865 // The default value for TRACKFLAGDEFAULT is 1, so add element
866 // if we need to clear it.
867 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
868 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
870 if (st->disposition & AV_DISPOSITION_FORCED)
871 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
873 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
874 const char *codec_id;
875 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
876 codec_id = "D_WEBVTT/CAPTIONS";
877 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
878 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
879 codec_id = "D_WEBVTT/DESCRIPTIONS";
880 native_id = MATROSKA_TRACK_TYPE_METADATA;
881 } else if (st->disposition & AV_DISPOSITION_METADATA) {
882 codec_id = "D_WEBVTT/METADATA";
883 native_id = MATROSKA_TRACK_TYPE_METADATA;
885 codec_id = "D_WEBVTT/SUBTITLES";
886 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
888 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
890 // look for a codec ID string specific to mkv to use,
891 // if none are found, use AVI codes
892 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
893 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
894 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
899 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->codec_tag) {
900 if (mkv->allow_raw_vfw) {
903 av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
904 "If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
905 return AVERROR(EINVAL);
910 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->initial_padding && codec->codec_id == AV_CODEC_ID_OPUS) {
911 // mkv->tracks[i].ts_offset = av_rescale_q(codec->initial_padding,
912 // (AVRational){ 1, codec->sample_rate },
915 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
916 av_rescale_q(codec->initial_padding,
917 (AVRational){ 1, codec->sample_rate },
918 (AVRational){ 1, 1000000000 }));
920 if (codec->codec_id == AV_CODEC_ID_OPUS) {
921 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
924 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
925 codec->codec_id == AV_CODEC_ID_VP9 ||
926 codec->codec_id == AV_CODEC_ID_OPUS ||
927 codec->codec_id == AV_CODEC_ID_VORBIS ||
928 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
929 av_log(s, AV_LOG_ERROR,
930 "Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
931 return AVERROR(EINVAL);
934 switch (codec->codec_type) {
935 case AVMEDIA_TYPE_VIDEO:
936 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
938 if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
939 && av_cmp_q(av_inv_q(st->avg_frame_rate), codec->time_base) > 0)
940 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
942 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * codec->time_base.num / codec->time_base.den);
945 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
946 ((!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id) && codec->codec_id != AV_CODEC_ID_RAWVIDEO) ||
947 codec->codec_id == AV_CODEC_ID_SVQ1 ||
948 codec->codec_id == AV_CODEC_ID_SVQ3 ||
949 codec->codec_id == AV_CODEC_ID_CINEPAK))
953 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
954 else if (!native_id) {
955 // if there is no mkv-specific codec ID, use VFW mode
956 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
957 mkv->tracks[i].write_dts = 1;
958 s->internal->avoid_negative_ts_use_pts = 0;
961 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
962 // XXX: interlace flag?
963 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
964 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
966 // check both side data and metadata for stereo information,
967 // write the result to the bitstream if any is found
968 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
970 &display_height_div);
974 if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
975 ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
976 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
977 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
980 // write DisplayWidth and DisplayHeight, they contain the size of
981 // a single source view and/or the display aspect ratio
982 if (st->sample_aspect_ratio.num) {
983 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
984 if (d_width > INT_MAX) {
985 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
986 return AVERROR(EINVAL);
988 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
989 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
990 } else if (display_width_div != 1 || display_height_div != 1) {
991 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
992 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
995 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
996 uint32_t color_space = av_le2ne32(codec->codec_tag);
997 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1000 end_ebml_master(pb, subinfo);
1003 case AVMEDIA_TYPE_AUDIO:
1004 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1007 // no mkv-specific ID, use ACM mode
1008 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1010 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1011 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
1012 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1013 if (output_sample_rate)
1014 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1016 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1017 end_ebml_master(pb, subinfo);
1020 case AVMEDIA_TYPE_SUBTITLE:
1022 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
1023 return AVERROR(ENOSYS);
1026 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
1027 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1029 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1032 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1033 return AVERROR(EINVAL);
1036 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
1037 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
1042 end_ebml_master(pb, track);
1047 static int mkv_write_tracks(AVFormatContext *s)
1049 MatroskaMuxContext *mkv = s->priv_data;
1050 AVIOContext *pb = s->pb;
1052 int i, ret, default_stream_exists = 0;
1054 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1058 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
1059 for (i = 0; i < s->nb_streams; i++) {
1060 AVStream *st = s->streams[i];
1061 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1063 for (i = 0; i < s->nb_streams; i++) {
1064 ret = mkv_write_track(s, mkv, i, pb, default_stream_exists);
1068 end_ebml_master(pb, tracks);
1072 static int mkv_write_chapters(AVFormatContext *s)
1074 MatroskaMuxContext *mkv = s->priv_data;
1075 AVIOContext *pb = s->pb;
1076 ebml_master chapters, editionentry;
1077 AVRational scale = {1, 1E9};
1080 if (!s->nb_chapters || mkv->wrote_chapters)
1083 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1084 if (ret < 0) return ret;
1086 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
1087 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
1088 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1089 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1090 for (i = 0; i < s->nb_chapters; i++) {
1091 ebml_master chapteratom, chapterdisplay;
1092 AVChapter *c = s->chapters[i];
1093 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1094 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1095 AVDictionaryEntry *t = NULL;
1096 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1097 av_log(s, AV_LOG_ERROR,
1098 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1099 chapterstart, chapterend);
1100 return AVERROR_INVALIDDATA;
1103 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
1104 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1105 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1106 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1107 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1108 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1109 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1110 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
1111 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
1112 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
1113 end_ebml_master(pb, chapterdisplay);
1115 end_ebml_master(pb, chapteratom);
1117 end_ebml_master(pb, editionentry);
1118 end_ebml_master(pb, chapters);
1120 mkv->wrote_chapters = 1;
1124 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1126 uint8_t *key = av_strdup(t->key);
1128 const uint8_t *lang = NULL;
1132 return AVERROR(ENOMEM);
1134 if ((p = strrchr(p, '-')) &&
1135 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1142 else if (*p >= 'a' && *p <= 'z')
1147 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1148 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1150 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1151 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1152 end_ebml_master(pb, tag);
1158 static int mkv_write_tag_targets(AVFormatContext *s,
1159 unsigned int elementid, unsigned int uid,
1160 ebml_master *tags, ebml_master* tag)
1162 MatroskaMuxContext *mkv = s->priv_data;
1163 ebml_master targets;
1167 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1168 if (ret < 0) return ret;
1170 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
1173 *tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
1174 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
1176 put_ebml_uint(s->pb, elementid, uid);
1177 end_ebml_master(s->pb, targets);
1181 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1182 unsigned int uid, ebml_master *tags)
1186 AVDictionaryEntry *t = NULL;
1188 ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1192 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1193 if (av_strcasecmp(t->key, "title") &&
1194 av_strcasecmp(t->key, "stereo_mode") &&
1195 av_strcasecmp(t->key, "encoding_tool")) {
1196 ret = mkv_write_simpletag(s->pb, t);
1202 end_ebml_master(s->pb, tag);
1206 static int mkv_check_tag(AVDictionary *m)
1208 AVDictionaryEntry *t = NULL;
1210 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1211 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
1217 static int mkv_write_tags(AVFormatContext *s)
1219 MatroskaMuxContext *mkv = s->priv_data;
1220 ebml_master tags = {0};
1223 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1225 if (mkv_check_tag(s->metadata)) {
1226 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
1227 if (ret < 0) return ret;
1230 for (i = 0; i < s->nb_streams; i++) {
1231 AVStream *st = s->streams[i];
1233 if (!mkv_check_tag(st->metadata))
1236 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
1237 if (ret < 0) return ret;
1240 if (!mkv->is_live) {
1241 for (i = 0; i < s->nb_streams; i++) {
1242 ebml_master tag_target;
1245 mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags, &tag_target);
1247 tag = start_ebml_master(s->pb, MATROSKA_ID_SIMPLETAG, 0);
1248 put_ebml_string(s->pb, MATROSKA_ID_TAGNAME, "DURATION");
1249 mkv->stream_duration_offsets[i] = avio_tell(s->pb);
1251 // Reserve space to write duration as a 20-byte string.
1252 // 2 (ebml id) + 1 (data size) + 20 (data)
1253 put_ebml_void(s->pb, 23);
1254 end_ebml_master(s->pb, tag);
1255 end_ebml_master(s->pb, tag_target);
1259 for (i = 0; i < s->nb_chapters; i++) {
1260 AVChapter *ch = s->chapters[i];
1262 if (!mkv_check_tag(ch->metadata))
1265 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
1266 if (ret < 0) return ret;
1270 end_ebml_master(s->pb, tags);
1274 static int mkv_write_attachments(AVFormatContext *s)
1276 MatroskaMuxContext *mkv = s->priv_data;
1277 AVIOContext *pb = s->pb;
1278 ebml_master attachments;
1282 if (!mkv->have_attachments)
1285 av_lfg_init(&c, av_get_random_seed());
1287 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1288 if (ret < 0) return ret;
1290 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1292 for (i = 0; i < s->nb_streams; i++) {
1293 AVStream *st = s->streams[i];
1294 ebml_master attached_file;
1295 AVDictionaryEntry *t;
1296 const char *mimetype = NULL;
1299 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1302 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1304 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1305 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1306 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1307 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1308 return AVERROR(EINVAL);
1310 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1311 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1312 mimetype = t->value;
1313 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1315 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1316 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1317 mimetype = ff_mkv_mime_tags[i].str;
1320 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1321 if (ff_mkv_image_mime_tags[i].id == st->codec->codec_id) {
1322 mimetype = ff_mkv_image_mime_tags[i].str;
1327 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1328 "it cannot be deduced from the codec id.\n", i);
1329 return AVERROR(EINVAL);
1332 if (s->flags & AVFMT_FLAG_BITEXACT) {
1333 struct AVSHA *sha = av_sha_alloc();
1336 return AVERROR(ENOMEM);
1337 av_sha_init(sha, 160);
1338 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1339 av_sha_final(sha, digest);
1341 fileuid = AV_RL64(digest);
1343 fileuid = av_lfg_get(&c);
1345 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1348 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1349 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1350 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1351 end_ebml_master(pb, attached_file);
1353 end_ebml_master(pb, attachments);
1358 static int mkv_write_header(AVFormatContext *s)
1360 MatroskaMuxContext *mkv = s->priv_data;
1361 AVIOContext *pb = s->pb;
1362 ebml_master ebml_header, segment_info;
1363 AVDictionaryEntry *tag;
1364 int ret, i, version = 2;
1366 if (!strcmp(s->oformat->name, "webm"))
1367 mkv->mode = MODE_WEBM;
1369 mkv->mode = MODE_MATROSKAv2;
1371 if (s->avoid_negative_ts < 0) {
1372 s->avoid_negative_ts = 1;
1373 s->internal->avoid_negative_ts_use_pts = 1;
1376 if (mkv->mode != MODE_WEBM ||
1377 av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1378 av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1381 for (i = 0; i < s->nb_streams; i++) {
1382 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1383 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1384 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1385 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1386 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1387 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1388 av_log(s, AV_LOG_ERROR,
1389 "The Matroska muxer does not yet support muxing %s\n",
1390 avcodec_get_name(s->streams[i]->codec->codec_id));
1391 return AVERROR_PATCHWELCOME;
1393 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_OPUS ||
1394 av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1395 av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1399 mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1401 return AVERROR(ENOMEM);
1403 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1404 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1405 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1406 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1407 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1408 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1409 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1410 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1411 end_ebml_master(pb, ebml_header);
1413 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1414 mkv->segment_offset = avio_tell(pb);
1416 // we write 2 seek heads - one at the end of the file to point to each
1417 // cluster, and one at the beginning to point to all other level one
1418 // elements (including the seek head at the end of the file), which
1419 // isn't more than 10 elements if we only write one of each other
1420 // currently defined level 1 element
1421 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1422 if (!mkv->main_seekhead)
1423 return AVERROR(ENOMEM);
1425 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1426 if (ret < 0) return ret;
1428 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1429 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1430 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1431 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1432 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1433 uint32_t segment_uid[4];
1436 av_lfg_init(&lfg, av_get_random_seed());
1438 for (i = 0; i < 4; i++)
1439 segment_uid[i] = av_lfg_get(&lfg);
1441 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1442 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1443 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1445 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1446 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1448 const char *ident = "Lavf";
1449 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1450 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1453 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1454 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1455 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1456 uint8_t date_utc_buf[8];
1457 AV_WB64(date_utc_buf, date_utc);
1458 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1461 // reserve space for the duration
1463 mkv->duration_offset = avio_tell(pb);
1464 if (!mkv->is_live) {
1465 put_ebml_void(pb, 11); // assumes double-precision float to be written
1467 end_ebml_master(pb, segment_info);
1469 // initialize stream_duration fields
1470 mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1471 mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1473 ret = mkv_write_tracks(s);
1477 for (i = 0; i < s->nb_chapters; i++)
1478 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1480 if (mkv->mode != MODE_WEBM) {
1481 ret = mkv_write_chapters(s);
1485 ret = mkv_write_tags(s);
1489 ret = mkv_write_attachments(s);
1494 if (!s->pb->seekable && !mkv->is_live)
1495 mkv_write_seekhead(pb, mkv->main_seekhead);
1497 mkv->cues = mkv_start_cues(mkv->segment_offset);
1499 return AVERROR(ENOMEM);
1501 if (pb->seekable && mkv->reserve_cues_space) {
1502 mkv->cues_pos = avio_tell(pb);
1503 put_ebml_void(pb, mkv->reserve_cues_space);
1506 av_init_packet(&mkv->cur_audio_pkt);
1507 mkv->cur_audio_pkt.size = 0;
1508 mkv->cluster_pos = -1;
1512 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1513 // after 4k and on a keyframe
1515 if (mkv->cluster_time_limit < 0)
1516 mkv->cluster_time_limit = 5000;
1517 if (mkv->cluster_size_limit < 0)
1518 mkv->cluster_size_limit = 5 * 1024 * 1024;
1520 if (mkv->cluster_time_limit < 0)
1521 mkv->cluster_time_limit = 1000;
1522 if (mkv->cluster_size_limit < 0)
1523 mkv->cluster_size_limit = 32 * 1024;
1529 static int mkv_blockgroup_size(int pkt_size)
1531 int size = pkt_size + 4;
1532 size += ebml_num_size(size);
1533 size += 2; // EBML ID for block and block duration
1534 size += 8; // max size of block duration
1535 size += ebml_num_size(size);
1536 size += 1; // blockgroup EBML ID
1540 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1547 dst = av_malloc(srclen);
1549 return AVERROR(ENOMEM);
1551 while (srclen >= WV_HEADER_SIZE) {
1554 ret = ff_wv_parse_header(&header, src);
1557 src += WV_HEADER_SIZE;
1558 srclen -= WV_HEADER_SIZE;
1560 if (srclen < header.blocksize) {
1561 ret = AVERROR_INVALIDDATA;
1565 if (header.initial) {
1566 AV_WL32(dst + offset, header.samples);
1569 AV_WL32(dst + offset, header.flags);
1570 AV_WL32(dst + offset + 4, header.crc);
1573 if (!(header.initial && header.final)) {
1574 AV_WL32(dst + offset, header.blocksize);
1578 memcpy(dst + offset, src, header.blocksize);
1579 src += header.blocksize;
1580 srclen -= header.blocksize;
1581 offset += header.blocksize;
1593 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1594 unsigned int blockid, AVPacket *pkt, int keyframe)
1596 MatroskaMuxContext *mkv = s->priv_data;
1597 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1598 uint8_t *data = NULL, *side_data = NULL;
1599 int offset = 0, size = pkt->size, side_data_size = 0;
1600 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1601 uint64_t additional_id = 0;
1602 int64_t discard_padding = 0;
1603 uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
1604 ebml_master block_group, block_additions, block_more;
1606 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1607 "pts %" PRId64 ", dts %" PRId64 ", duration %d, keyframe %d\n",
1608 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
1610 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1611 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1612 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1613 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1614 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1615 /* extradata is Annex B, assume the bitstream is too and convert it */
1616 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1617 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1618 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1620 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1626 if (codec->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
1627 /* Matroska specification requires to remove the first QuickTime atom
1633 side_data = av_packet_get_side_data(pkt,
1634 AV_PKT_DATA_SKIP_SAMPLES,
1637 if (side_data && side_data_size >= 10) {
1638 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1639 (AVRational){1, codec->sample_rate},
1640 (AVRational){1, 1000000000});
1643 side_data = av_packet_get_side_data(pkt,
1644 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1647 additional_id = AV_RB64(side_data);
1649 side_data_size -= 8;
1652 if ((side_data_size && additional_id == 1) || discard_padding) {
1653 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1654 blockid = MATROSKA_ID_BLOCK;
1657 put_ebml_id(pb, blockid);
1658 put_ebml_num(pb, size + 4, 0);
1659 // this assumes stream_index is less than 126
1660 avio_w8(pb, 0x80 | track_number);
1661 avio_wb16(pb, ts - mkv->cluster_pts);
1662 avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
1663 avio_write(pb, data + offset, size);
1664 if (data != pkt->data)
1667 if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
1668 put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
1669 mkv->last_track_timestamp[track_number - 1]);
1671 mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
1673 if (discard_padding) {
1674 put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1677 if (side_data_size && additional_id == 1) {
1678 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1679 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1680 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1681 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1682 put_ebml_num(pb, side_data_size, 0);
1683 avio_write(pb, side_data, side_data_size);
1684 end_ebml_master(pb, block_more);
1685 end_ebml_master(pb, block_additions);
1687 if ((side_data_size && additional_id == 1) || discard_padding) {
1688 end_ebml_master(pb, block_group);
1692 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1694 MatroskaMuxContext *mkv = s->priv_data;
1695 ebml_master blockgroup;
1696 int id_size, settings_size, size;
1697 uint8_t *id, *settings;
1698 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1699 const int flags = 0;
1702 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1706 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1709 size = id_size + 1 + settings_size + 1 + pkt->size;
1711 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1712 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1713 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1715 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1717 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1718 put_ebml_num(pb, size + 4, 0);
1719 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1720 avio_wb16(pb, ts - mkv->cluster_pts);
1722 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1724 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1725 end_ebml_master(pb, blockgroup);
1727 return pkt->duration;
1730 static void mkv_flush_dynbuf(AVFormatContext *s)
1732 MatroskaMuxContext *mkv = s->priv_data;
1739 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1740 avio_write(s->pb, dyn_buf, bufsize);
1745 static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
1747 MatroskaMuxContext *mkv = s->priv_data;
1750 if (s->pb->seekable) {
1756 av_log(s, AV_LOG_DEBUG,
1757 "Starting new cluster at offset %" PRIu64 " bytes, "
1758 "pts %" PRIu64 "dts %" PRIu64 "\n",
1759 avio_tell(pb), pkt->pts, pkt->dts);
1760 end_ebml_master(pb, mkv->cluster);
1761 mkv->cluster_pos = -1;
1763 mkv_flush_dynbuf(s);
1767 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
1769 MatroskaMuxContext *mkv = s->priv_data;
1770 AVIOContext *pb = s->pb;
1771 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1772 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1773 int duration = pkt->duration;
1775 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1776 int64_t relative_packet_pos;
1777 int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
1779 if (ts == AV_NOPTS_VALUE) {
1780 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1781 return AVERROR(EINVAL);
1783 ts += mkv->tracks[pkt->stream_index].ts_offset;
1785 if (mkv->cluster_pos != -1) {
1786 int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
1787 if ((int16_t)cluster_time != cluster_time) {
1788 av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
1789 mkv_start_new_cluster(s, pkt);
1793 if (!s->pb->seekable) {
1795 ret = avio_open_dyn_buf(&mkv->dyn_bc);
1797 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1804 if (mkv->cluster_pos == -1) {
1805 mkv->cluster_pos = avio_tell(s->pb);
1806 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1807 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1808 mkv->cluster_pts = FFMAX(0, ts);
1811 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1813 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1814 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
1815 if (s->pb->seekable && (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
1816 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
1817 if (ret < 0) return ret;
1820 if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1821 duration = mkv_write_vtt_blocks(s, pb, pkt);
1823 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1824 mkv_blockgroup_size(pkt->size));
1825 /* For backward compatibility, prefer convergence_duration. */
1826 if (pkt->convergence_duration > 0) {
1827 duration = pkt->convergence_duration;
1829 /* All subtitle blocks are considered to be keyframes. */
1830 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
1831 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1832 end_ebml_master(pb, blockgroup);
1835 if (s->pb->seekable) {
1836 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
1837 mkv->cluster_pos, relative_packet_pos, duration);
1843 mkv->duration = FFMAX(mkv->duration, ts + duration);
1845 if (mkv->stream_durations)
1846 mkv->stream_durations[pkt->stream_index] =
1847 FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
1852 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1854 MatroskaMuxContext *mkv = s->priv_data;
1855 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1856 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1858 int64_t cluster_time;
1860 int start_new_cluster;
1862 if (mkv->tracks[pkt->stream_index].write_dts)
1863 cluster_time = pkt->dts - mkv->cluster_pts;
1865 cluster_time = pkt->pts - mkv->cluster_pts;
1866 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1868 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1869 // after 4k and on a keyframe
1870 if (s->pb->seekable) {
1871 cluster_size = avio_tell(s->pb) - mkv->cluster_pos;
1873 cluster_size = avio_tell(mkv->dyn_bc);
1876 if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
1877 // WebM DASH specification states that the first block of every cluster
1878 // has to be a key frame. So for DASH video, we only create a cluster
1879 // on seeing key frames.
1880 start_new_cluster = keyframe;
1881 } else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
1882 (mkv->cluster_pos == -1 ||
1883 cluster_time > mkv->cluster_time_limit)) {
1884 // For DASH audio, we create a Cluster based on cluster_time_limit
1885 start_new_cluster = 1;
1886 } else if (!mkv->is_dash &&
1887 (cluster_size > mkv->cluster_size_limit ||
1888 cluster_time > mkv->cluster_time_limit ||
1889 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1890 cluster_size > 4 * 1024))) {
1891 start_new_cluster = 1;
1893 start_new_cluster = 0;
1896 if (mkv->cluster_pos != -1 && start_new_cluster) {
1897 mkv_start_new_cluster(s, pkt);
1900 // check if we have an audio packet cached
1901 if (mkv->cur_audio_pkt.size > 0) {
1902 // for DASH audio, a CuePoint has to be added when there is a new cluster.
1903 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
1904 mkv->is_dash ? start_new_cluster : 0);
1905 av_free_packet(&mkv->cur_audio_pkt);
1907 av_log(s, AV_LOG_ERROR,
1908 "Could not write cached audio packet ret:%d\n", ret);
1913 // buffer an audio packet to ensure the packet containing the video
1914 // keyframe's timecode is contained in the same cluster for WebM
1915 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1916 mkv->cur_audio_pkt = *pkt;
1918 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1919 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1921 ret = av_dup_packet(&mkv->cur_audio_pkt);
1922 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1923 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1926 ret = mkv_write_packet_internal(s, pkt, 0);
1930 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1932 MatroskaMuxContext *mkv = s->priv_data;
1934 if (s->pb->seekable)
1939 if (mkv->cluster_pos != -1) {
1940 av_log(s, AV_LOG_DEBUG,
1941 "Flushing cluster at offset %" PRIu64 " bytes\n",
1943 end_ebml_master(pb, mkv->cluster);
1944 mkv->cluster_pos = -1;
1946 mkv_flush_dynbuf(s);
1951 return mkv_write_packet(s, pkt);
1954 static int mkv_write_trailer(AVFormatContext *s)
1956 MatroskaMuxContext *mkv = s->priv_data;
1957 AVIOContext *pb = s->pb;
1958 int64_t currentpos, cuespos;
1961 // check if we have an audio packet cached
1962 if (mkv->cur_audio_pkt.size > 0) {
1963 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
1964 av_free_packet(&mkv->cur_audio_pkt);
1966 av_log(s, AV_LOG_ERROR,
1967 "Could not write cached audio packet ret:%d\n", ret);
1973 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1974 mkv_flush_dynbuf(s);
1975 } else if (mkv->cluster_pos != -1) {
1976 end_ebml_master(pb, mkv->cluster);
1979 if (mkv->mode != MODE_WEBM) {
1980 ret = mkv_write_chapters(s);
1986 if (mkv->cues->num_entries) {
1987 if (mkv->reserve_cues_space) {
1990 currentpos = avio_tell(pb);
1991 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1993 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
1994 cues_end = avio_tell(pb);
1995 if (cues_end > cuespos + mkv->reserve_cues_space) {
1996 av_log(s, AV_LOG_ERROR,
1997 "Insufficient space reserved for cues: %d "
1998 "(needed: %" PRId64 ").\n",
1999 mkv->reserve_cues_space, cues_end - cuespos);
2000 return AVERROR(EINVAL);
2003 if (cues_end < cuespos + mkv->reserve_cues_space)
2004 put_ebml_void(pb, mkv->reserve_cues_space -
2005 (cues_end - cuespos));
2007 avio_seek(pb, currentpos, SEEK_SET);
2009 cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2012 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2018 mkv_write_seekhead(pb, mkv->main_seekhead);
2020 // update the duration
2021 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2022 currentpos = avio_tell(pb);
2023 avio_seek(pb, mkv->duration_offset, SEEK_SET);
2024 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
2026 // update stream durations
2027 if (mkv->stream_durations) {
2029 for (i = 0; i < s->nb_streams; ++i) {
2030 AVStream *st = s->streams[i];
2031 double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2032 char duration_string[20] = "";
2034 av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2035 mkv->stream_durations[i]);
2037 if (!mkv->is_live && mkv->stream_duration_offsets[i] > 0) {
2038 avio_seek(pb, mkv->stream_duration_offsets[i], SEEK_SET);
2040 snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2041 (int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2042 fmod(duration_sec, 60));
2044 put_ebml_binary(pb, MATROSKA_ID_TAGSTRING, duration_string, 20);
2049 avio_seek(pb, currentpos, SEEK_SET);
2052 if (!mkv->is_live) {
2053 end_ebml_master(pb, mkv->segment);
2055 av_freep(&mkv->tracks);
2056 av_freep(&mkv->cues->entries);
2057 av_freep(&mkv->cues);
2058 av_freep(&mkv->stream_durations);
2059 av_freep(&mkv->stream_duration_offsets);
2064 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2067 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2068 if (ff_mkv_codec_tags[i].id == codec_id)
2071 if (std_compliance < FF_COMPLIANCE_NORMAL) {
2072 enum AVMediaType type = avcodec_get_type(codec_id);
2073 // mkv theoretically supports any video/audio through VFW/ACM
2074 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2081 static const AVCodecTag additional_audio_tags[] = {
2082 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2083 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
2084 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
2085 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2086 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2087 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2088 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2089 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2090 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2091 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2092 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
2093 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2094 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2097 static const AVCodecTag additional_video_tags[] = {
2098 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
2099 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
2100 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
2101 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
2102 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
2103 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2106 static const AVCodecTag additional_subtitle_tags[] = {
2107 { AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2108 { AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2109 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
2112 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
2113 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2114 static const AVOption options[] = {
2115 { "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 },
2116 { "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 },
2117 { "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 },
2118 { "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
2119 { "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2120 { "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
2121 { "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
2125 #if CONFIG_MATROSKA_MUXER
2126 static const AVClass matroska_class = {
2127 .class_name = "matroska muxer",
2128 .item_name = av_default_item_name,
2130 .version = LIBAVUTIL_VERSION_INT,
2133 AVOutputFormat ff_matroska_muxer = {
2135 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2136 .mime_type = "video/x-matroska",
2137 .extensions = "mkv",
2138 .priv_data_size = sizeof(MatroskaMuxContext),
2139 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2140 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2141 .video_codec = CONFIG_LIBX264_ENCODER ?
2142 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2143 .write_header = mkv_write_header,
2144 .write_packet = mkv_write_flush_packet,
2145 .write_trailer = mkv_write_trailer,
2146 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2147 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2148 .codec_tag = (const AVCodecTag* const []){
2149 ff_codec_bmp_tags, ff_codec_wav_tags,
2150 additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2152 .subtitle_codec = AV_CODEC_ID_ASS,
2153 .query_codec = mkv_query_codec,
2154 .priv_class = &matroska_class,
2158 #if CONFIG_WEBM_MUXER
2159 static const AVClass webm_class = {
2160 .class_name = "webm muxer",
2161 .item_name = av_default_item_name,
2163 .version = LIBAVUTIL_VERSION_INT,
2166 AVOutputFormat ff_webm_muxer = {
2168 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
2169 .mime_type = "video/webm",
2170 .extensions = "webm",
2171 .priv_data_size = sizeof(MatroskaMuxContext),
2172 .audio_codec = AV_CODEC_ID_VORBIS,
2173 .video_codec = AV_CODEC_ID_VP8,
2174 .subtitle_codec = AV_CODEC_ID_WEBVTT,
2175 .write_header = mkv_write_header,
2176 .write_packet = mkv_write_flush_packet,
2177 .write_trailer = mkv_write_trailer,
2178 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2179 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2180 .priv_class = &webm_class,
2184 #if CONFIG_MATROSKA_AUDIO_MUXER
2185 static const AVClass mka_class = {
2186 .class_name = "matroska audio muxer",
2187 .item_name = av_default_item_name,
2189 .version = LIBAVUTIL_VERSION_INT,
2191 AVOutputFormat ff_matroska_audio_muxer = {
2193 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2194 .mime_type = "audio/x-matroska",
2195 .extensions = "mka",
2196 .priv_data_size = sizeof(MatroskaMuxContext),
2197 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2198 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2199 .video_codec = AV_CODEC_ID_NONE,
2200 .write_header = mkv_write_header,
2201 .write_packet = mkv_write_flush_packet,
2202 .write_trailer = mkv_write_trailer,
2203 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2205 .codec_tag = (const AVCodecTag* const []){
2206 ff_codec_wav_tags, additional_audio_tags, 0
2208 .priv_class = &mka_class,