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
24 #include "avio_internal.h"
25 #include "avlanguage.h"
31 #include "subtitles.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/intfloat.h"
37 #include "libavutil/intreadwrite.h"
38 #include "libavutil/lfg.h"
39 #include "libavutil/mathematics.h"
40 #include "libavutil/opt.h"
41 #include "libavutil/random_seed.h"
42 #include "libavutil/samplefmt.h"
43 #include "libavutil/sha.h"
45 #include "libavcodec/xiph.h"
46 #include "libavcodec/mpeg4audio.h"
47 #include "libavcodec/internal.h"
49 typedef struct ebml_master {
50 int64_t pos; ///< absolute offset in the file where the master's elements start
51 int sizebytes; ///< how many bytes were reserved for the size
54 typedef struct mkv_seekhead_entry {
55 unsigned int elementid;
59 typedef struct mkv_seekhead {
61 int64_t segment_offset; ///< the file offset to the beginning of the segment
62 int reserved_size; ///< -1 if appending to file
64 mkv_seekhead_entry *entries;
71 int64_t cluster_pos; ///< file offset of the cluster containing the block
72 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
73 int64_t duration; ///< duration of the block according to time base
77 int64_t segment_offset;
78 mkv_cuepoint *entries;
87 #define MODE_MATROSKAv2 0x01
88 #define MODE_WEBM 0x02
90 typedef struct MatroskaMuxContext {
95 int64_t segment_offset;
97 int64_t cluster_pos; ///< file offset of the current cluster
99 int64_t duration_offset;
101 mkv_seekhead *main_seekhead;
105 AVPacket cur_audio_pkt;
107 int have_attachments;
109 int reserve_cues_space;
110 int cluster_size_limit;
112 int64_t cluster_time_limit;
114 uint32_t chapter_id_offset;
116 } MatroskaMuxContext;
119 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
120 * offset, 4 bytes for target EBML ID */
121 #define MAX_SEEKENTRY_SIZE 21
123 /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
125 #define MAX_CUETRACKPOS_SIZE 42
127 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
128 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
130 /** Seek preroll value for opus */
131 #define OPUS_SEEK_PREROLL 80000000
134 static int ebml_id_size(unsigned int id)
136 return (av_log2(id+1)-1)/7+1;
139 static void put_ebml_id(AVIOContext *pb, unsigned int id)
141 int i = ebml_id_size(id);
143 avio_w8(pb, (uint8_t)(id >> (i*8)));
147 * Write an EBML size meaning "unknown size".
149 * @param bytes The number of bytes the size should occupy (maximum: 8).
151 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
153 av_assert0(bytes <= 8);
154 avio_w8(pb, 0x1ff >> bytes);
155 ffio_fill(pb, 0xff, bytes - 1);
159 * Calculate how many bytes are needed to represent a given number in EBML.
161 static int ebml_num_size(uint64_t num)
164 while ((num+1) >> bytes*7) bytes++;
169 * Write a number in EBML variable length format.
171 * @param bytes The number of bytes that need to be used to write the number.
172 * If zero, any number of bytes can be used.
174 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
176 int i, needed_bytes = ebml_num_size(num);
178 // sizes larger than this are currently undefined in EBML
179 av_assert0(num < (1ULL<<56)-1);
182 // don't care how many bytes are used, so use the min
183 bytes = needed_bytes;
184 // the bytes needed to write the given size would exceed the bytes
185 // that we need to use, so write unknown size. This shouldn't happen.
186 av_assert0(bytes >= needed_bytes);
188 num |= 1ULL << bytes*7;
189 for (i = bytes - 1; i >= 0; i--)
190 avio_w8(pb, (uint8_t)(num >> i*8));
193 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
197 while (tmp>>=8) bytes++;
199 put_ebml_id(pb, elementid);
200 put_ebml_num(pb, bytes, 0);
201 for (i = bytes - 1; i >= 0; i--)
202 avio_w8(pb, (uint8_t)(val >> i*8));
205 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
207 put_ebml_id(pb, elementid);
208 put_ebml_num(pb, 8, 0);
209 avio_wb64(pb, av_double2int(val));
212 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
213 const void *buf, int size)
215 put_ebml_id(pb, elementid);
216 put_ebml_num(pb, size, 0);
217 avio_write(pb, buf, size);
220 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
222 put_ebml_binary(pb, elementid, str, strlen(str));
226 * Write a void element of a given size. Useful for reserving space in
227 * the file to be written to later.
229 * @param size The number of bytes to reserve, which must be at least 2.
231 static void put_ebml_void(AVIOContext *pb, uint64_t size)
233 int64_t currentpos = avio_tell(pb);
235 av_assert0(size >= 2);
237 put_ebml_id(pb, EBML_ID_VOID);
238 // we need to subtract the length needed to store the size from the
239 // size we need to reserve so 2 cases, we use 8 bytes to store the
240 // size if possible, 1 byte otherwise
242 put_ebml_num(pb, size-1, 0);
244 put_ebml_num(pb, size-9, 8);
245 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
248 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
250 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
251 put_ebml_id(pb, elementid);
252 put_ebml_size_unknown(pb, bytes);
253 return (ebml_master){ avio_tell(pb), bytes };
256 static void end_ebml_master(AVIOContext *pb, ebml_master master)
258 int64_t pos = avio_tell(pb);
260 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
262 put_ebml_num(pb, pos - master.pos, master.sizebytes);
263 avio_seek(pb, pos, SEEK_SET);
266 static void put_xiph_size(AVIOContext *pb, int size)
268 ffio_fill(pb, 255, size / 255);
269 avio_w8(pb, size % 255);
273 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
274 * elements. If a maximum number of elements is specified, enough space
275 * will be reserved at the current file location to write a seek head of
278 * @param segment_offset The absolute offset to the position in the file
279 * where the segment begins.
280 * @param numelements The maximum number of elements that will be indexed
281 * by this seek head, 0 if unlimited.
283 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
285 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
286 if (new_seekhead == NULL)
289 new_seekhead->segment_offset = segment_offset;
291 if (numelements > 0) {
292 new_seekhead->filepos = avio_tell(pb);
293 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
294 // and size, and 3 bytes to guarantee that an EBML void element
295 // will fit afterwards
296 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
297 new_seekhead->max_entries = numelements;
298 put_ebml_void(pb, new_seekhead->reserved_size);
303 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
305 mkv_seekhead_entry *entries = seekhead->entries;
307 // don't store more elements than we reserved space for
308 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
311 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
313 return AVERROR(ENOMEM);
314 seekhead->entries = entries;
316 seekhead->entries[seekhead->num_entries].elementid = elementid;
317 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
323 * Write the seek head to the file and free it. If a maximum number of
324 * elements was specified to mkv_start_seekhead(), the seek head will
325 * be written at the location reserved for it. Otherwise, it is written
326 * at the current location in the file.
328 * @return The file offset where the seekhead was written,
329 * -1 if an error occurred.
331 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
333 ebml_master metaseek, seekentry;
337 currentpos = avio_tell(pb);
339 if (seekhead->reserved_size > 0) {
340 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
346 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
347 for (i = 0; i < seekhead->num_entries; i++) {
348 mkv_seekhead_entry *entry = &seekhead->entries[i];
350 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
352 put_ebml_id(pb, MATROSKA_ID_SEEKID);
353 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
354 put_ebml_id(pb, entry->elementid);
356 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
357 end_ebml_master(pb, seekentry);
359 end_ebml_master(pb, metaseek);
361 if (seekhead->reserved_size > 0) {
362 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
363 put_ebml_void(pb, remaining);
364 avio_seek(pb, currentpos, SEEK_SET);
366 currentpos = seekhead->filepos;
369 av_freep(&seekhead->entries);
375 static mkv_cues * mkv_start_cues(int64_t segment_offset)
377 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
381 cues->segment_offset = segment_offset;
385 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos,
388 mkv_cuepoint *entries = cues->entries;
393 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
395 return AVERROR(ENOMEM);
396 cues->entries = entries;
398 cues->entries[cues->num_entries].pts = ts;
399 cues->entries[cues->num_entries].tracknum = stream + 1;
400 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
401 cues->entries[cues->num_entries].relative_pos = relative_pos;
402 cues->entries[cues->num_entries++].duration = duration;
407 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
409 ebml_master cues_element;
413 currentpos = avio_tell(pb);
414 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
416 for (i = 0; i < cues->num_entries; i++) {
417 ebml_master cuepoint, track_positions;
418 mkv_cuepoint *entry = &cues->entries[i];
419 uint64_t pts = entry->pts;
421 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
422 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
424 // put all the entries from different tracks that have the exact same
425 // timestamp into the same CuePoint
426 for (j = 0; j < num_tracks; j++)
427 tracks[j].has_cue = 0;
428 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
429 int tracknum = entry[j].tracknum - 1;
430 av_assert0(tracknum>=0 && tracknum<num_tracks);
431 if (tracks[tracknum].has_cue)
433 tracks[tracknum].has_cue = 1;
434 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
435 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
436 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
437 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
438 if (entry[j].duration != -1)
439 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION , entry[j].duration);
440 end_ebml_master(pb, track_positions);
443 end_ebml_master(pb, cuepoint);
445 end_ebml_master(pb, cues_element);
450 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
452 uint8_t *header_start[3];
454 int first_header_size;
457 if (codec->codec_id == AV_CODEC_ID_VORBIS)
458 first_header_size = 30;
460 first_header_size = 42;
462 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
463 first_header_size, header_start, header_len) < 0) {
464 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
468 avio_w8(pb, 2); // number packets - 1
469 for (j = 0; j < 2; j++) {
470 put_xiph_size(pb, header_len[j]);
472 for (j = 0; j < 3; j++)
473 avio_write(pb, header_start[j], header_len[j]);
478 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
480 if (codec->extradata && codec->extradata_size == 2)
481 avio_write(pb, codec->extradata, 2);
483 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
487 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
489 MPEG4AudioConfig mp4ac;
491 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
492 codec->extradata_size * 8, 1) < 0) {
493 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
497 *sample_rate = mp4ac.sample_rate;
498 *output_sample_rate = mp4ac.ext_sample_rate;
501 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
505 int ret, codecpriv_size;
507 ret = avio_open_dyn_buf(&dyn_cp);
512 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
513 ret = put_xiph_codecpriv(s, dyn_cp, codec);
514 else if (codec->codec_id == AV_CODEC_ID_FLAC)
515 ret = ff_flac_write_header(dyn_cp, codec, 1);
516 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
517 ret = put_wv_codecpriv(dyn_cp, codec);
518 else if (codec->codec_id == AV_CODEC_ID_H264)
519 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
520 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
521 if (codec->extradata_size < 36) {
522 av_log(s, AV_LOG_ERROR,
523 "Invalid extradata found, ALAC expects a 36-byte "
525 ret = AVERROR_INVALIDDATA;
527 avio_write(dyn_cp, codec->extradata + 12,
528 codec->extradata_size - 12);
530 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
531 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
532 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
534 if (!codec->codec_tag)
535 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
536 if (codec->extradata_size)
537 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
539 if (!codec->codec_tag)
540 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
541 if (!codec->codec_tag) {
542 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
543 avcodec_get_name(codec->codec_id));
544 ret = AVERROR(EINVAL);
547 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
550 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
552 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
554 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
555 avcodec_get_name(codec->codec_id));
556 ret = AVERROR(EINVAL);
558 if (!codec->codec_tag)
559 codec->codec_tag = tag;
561 ff_put_wav_header(dyn_cp, codec);
564 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
566 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
571 static int mkv_write_tracks(AVFormatContext *s)
573 MatroskaMuxContext *mkv = s->priv_data;
574 AVIOContext *pb = s->pb;
576 int i, j, ret, default_stream_exists = 0;
578 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
579 if (ret < 0) return ret;
581 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
582 for (i = 0; i < s->nb_streams; i++) {
583 AVStream *st = s->streams[i];
584 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
586 for (i = 0; i < s->nb_streams; i++) {
587 AVStream *st = s->streams[i];
588 AVCodecContext *codec = st->codec;
589 ebml_master subinfo, track;
592 int bit_depth = av_get_bits_per_sample(codec->codec_id);
593 int sample_rate = codec->sample_rate;
594 int output_sample_rate = 0;
595 int display_width_div = 1;
596 int display_height_div = 1;
597 AVDictionaryEntry *tag;
599 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
600 mkv->have_attachments = 1;
605 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
607 bit_depth = codec->bits_per_coded_sample;
609 if (codec->codec_id == AV_CODEC_ID_AAC)
610 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
612 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
613 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
614 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
615 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
617 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
618 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
619 tag = av_dict_get(st->metadata, "language", NULL, 0);
620 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
621 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
622 } else if (tag && tag->value) {
623 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
626 // The default value for TRACKFLAGDEFAULT is 1, so add element
627 // if we need to clear it.
628 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
629 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
631 if (st->disposition & AV_DISPOSITION_FORCED)
632 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
634 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
635 const char *codec_id;
636 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
637 codec_id = "D_WEBVTT/CAPTIONS";
638 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
639 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
640 codec_id = "D_WEBVTT/DESCRIPTIONS";
641 native_id = MATROSKA_TRACK_TYPE_METADATA;
642 } else if (st->disposition & AV_DISPOSITION_METADATA) {
643 codec_id = "D_WEBVTT/METADATA";
644 native_id = MATROSKA_TRACK_TYPE_METADATA;
646 codec_id = "D_WEBVTT/SUBTITLES";
647 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
649 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
651 // look for a codec ID string specific to mkv to use,
652 // if none are found, use AVI codes
653 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
654 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
655 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
662 if (codec->codec_id == AV_CODEC_ID_OPUS) {
663 uint64_t codec_delay =av_rescale_q(codec->delay,
664 (AVRational){1, codec->sample_rate},
665 (AVRational){1, 1000000000});
666 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codec_delay);
667 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
671 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
672 codec->codec_id == AV_CODEC_ID_VP9 ||
673 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
674 codec->codec_id == AV_CODEC_ID_VORBIS ||
675 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
676 av_log(s, AV_LOG_ERROR,
677 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
678 return AVERROR(EINVAL);
681 switch (codec->codec_type) {
682 case AVMEDIA_TYPE_VIDEO:
683 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
684 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
685 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
687 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
690 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
691 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
692 || codec->codec_id == AV_CODEC_ID_SVQ1
693 || codec->codec_id == AV_CODEC_ID_SVQ3
694 || codec->codec_id == AV_CODEC_ID_CINEPAK))
698 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
699 else if (!native_id) {
700 // if there is no mkv-specific codec ID, use VFW mode
701 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
702 mkv->tracks[i].write_dts = 1;
705 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
706 // XXX: interlace flag?
707 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
708 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
710 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
711 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
712 // save stereo mode flag
713 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
715 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
716 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
721 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
722 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
723 av_log(s, AV_LOG_ERROR,
724 "The specified stereo mode is not valid.\n");
725 return AVERROR(EINVAL);
727 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
734 display_width_div = 2;
740 display_height_div = 2;
745 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
746 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
747 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
748 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
751 if (st->sample_aspect_ratio.num) {
752 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
753 if (d_width > INT_MAX) {
754 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
755 return AVERROR(EINVAL);
757 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
758 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
759 } else if (display_width_div != 1 || display_height_div != 1) {
760 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);
761 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);
764 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
765 uint32_t color_space = av_le2ne32(codec->codec_tag);
766 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
768 end_ebml_master(pb, subinfo);
771 case AVMEDIA_TYPE_AUDIO:
772 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
775 // no mkv-specific ID, use ACM mode
776 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
778 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
779 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
780 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
781 if (output_sample_rate)
782 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
784 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
785 end_ebml_master(pb, subinfo);
788 case AVMEDIA_TYPE_SUBTITLE:
790 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
791 return AVERROR(ENOSYS);
794 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
795 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
797 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
800 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
801 return AVERROR(EINVAL);
804 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
805 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
806 if (ret < 0) return ret;
809 end_ebml_master(pb, track);
811 // ms precision is the de-facto standard timescale for mkv files
812 avpriv_set_pts_info(st, 64, 1, 1000);
814 end_ebml_master(pb, tracks);
818 static int mkv_write_chapters(AVFormatContext *s)
820 MatroskaMuxContext *mkv = s->priv_data;
821 AVIOContext *pb = s->pb;
822 ebml_master chapters, editionentry;
823 AVRational scale = {1, 1E9};
826 if (!s->nb_chapters || mkv->wrote_chapters)
829 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
830 if (ret < 0) return ret;
832 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
833 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
834 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
835 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
836 for (i = 0; i < s->nb_chapters; i++) {
837 ebml_master chapteratom, chapterdisplay;
838 AVChapter *c = s->chapters[i];
839 AVDictionaryEntry *t = NULL;
841 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
842 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
843 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
844 av_rescale_q(c->start, c->time_base, scale));
845 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
846 av_rescale_q(c->end, c->time_base, scale));
847 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
848 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
849 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
850 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
851 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
852 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
853 end_ebml_master(pb, chapterdisplay);
855 end_ebml_master(pb, chapteratom);
857 end_ebml_master(pb, editionentry);
858 end_ebml_master(pb, chapters);
860 mkv->wrote_chapters = 1;
864 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
866 uint8_t *key = av_strdup(t->key);
868 const uint8_t *lang = NULL;
871 if ((p = strrchr(p, '-')) &&
872 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
879 else if (*p >= 'a' && *p <= 'z')
884 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
885 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
887 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
888 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
889 end_ebml_master(pb, tag);
894 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
895 unsigned int uid, ebml_master *tags)
897 MatroskaMuxContext *mkv = s->priv_data;
898 ebml_master tag, targets;
899 AVDictionaryEntry *t = NULL;
903 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
904 if (ret < 0) return ret;
906 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
909 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
910 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
912 put_ebml_uint(s->pb, elementid, uid);
913 end_ebml_master(s->pb, targets);
915 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
916 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
917 mkv_write_simpletag(s->pb, t);
919 end_ebml_master(s->pb, tag);
923 static int mkv_check_tag(AVDictionary *m)
925 AVDictionaryEntry *t = NULL;
927 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
928 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
934 static int mkv_write_tags(AVFormatContext *s)
936 MatroskaMuxContext *mkv = s->priv_data;
937 ebml_master tags = {0};
940 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
942 if (mkv_check_tag(s->metadata)) {
943 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
944 if (ret < 0) return ret;
947 for (i = 0; i < s->nb_streams; i++) {
948 AVStream *st = s->streams[i];
950 if (!mkv_check_tag(st->metadata))
953 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
954 if (ret < 0) return ret;
957 for (i = 0; i < s->nb_chapters; i++) {
958 AVChapter *ch = s->chapters[i];
960 if (!mkv_check_tag(ch->metadata))
963 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
964 if (ret < 0) return ret;
968 end_ebml_master(s->pb, tags);
972 static int mkv_write_attachments(AVFormatContext *s)
974 MatroskaMuxContext *mkv = s->priv_data;
975 AVIOContext *pb = s->pb;
976 ebml_master attachments;
980 if (!mkv->have_attachments)
983 av_lfg_init(&c, av_get_random_seed());
985 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
986 if (ret < 0) return ret;
988 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
990 for (i = 0; i < s->nb_streams; i++) {
991 AVStream *st = s->streams[i];
992 ebml_master attached_file;
993 AVDictionaryEntry *t;
994 const char *mimetype = NULL;
997 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1000 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1002 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1003 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1004 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1005 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1006 return AVERROR(EINVAL);
1008 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1009 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1010 mimetype = t->value;
1011 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
1013 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1014 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1015 mimetype = ff_mkv_mime_tags[i].str;
1020 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1021 "it cannot be deduced from the codec id.\n", i);
1022 return AVERROR(EINVAL);
1025 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
1026 struct AVSHA *sha = av_sha_alloc();
1029 return AVERROR(ENOMEM);
1030 av_sha_init(sha, 160);
1031 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1032 av_sha_final(sha, digest);
1034 fileuid = AV_RL64(digest);
1036 fileuid = av_lfg_get(&c);
1038 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1041 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1042 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1043 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1044 end_ebml_master(pb, attached_file);
1046 end_ebml_master(pb, attachments);
1051 static int mkv_write_header(AVFormatContext *s)
1053 MatroskaMuxContext *mkv = s->priv_data;
1054 AVIOContext *pb = s->pb;
1055 ebml_master ebml_header, segment_info;
1056 AVDictionaryEntry *tag;
1059 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1060 else mkv->mode = MODE_MATROSKAv2;
1062 if (s->avoid_negative_ts < 0)
1063 s->avoid_negative_ts = 1;
1065 for (i = 0; i < s->nb_streams; i++)
1066 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1067 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1068 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1069 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1070 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1071 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1072 av_log(s, AV_LOG_ERROR,
1073 "The Matroska muxer does not yet support muxing %s\n",
1074 avcodec_get_name(s->streams[i]->codec->codec_id));
1075 return AVERROR_PATCHWELCOME;
1078 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1080 return AVERROR(ENOMEM);
1082 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1083 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1084 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1085 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1086 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1087 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1088 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 4);
1089 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1090 end_ebml_master(pb, ebml_header);
1092 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1093 mkv->segment_offset = avio_tell(pb);
1095 // we write 2 seek heads - one at the end of the file to point to each
1096 // cluster, and one at the beginning to point to all other level one
1097 // elements (including the seek head at the end of the file), which
1098 // isn't more than 10 elements if we only write one of each other
1099 // currently defined level 1 element
1100 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1101 if (!mkv->main_seekhead)
1102 return AVERROR(ENOMEM);
1104 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1105 if (ret < 0) return ret;
1107 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1108 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1109 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1110 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1111 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1112 uint32_t segment_uid[4];
1115 av_lfg_init(&lfg, av_get_random_seed());
1117 for (i = 0; i < 4; i++)
1118 segment_uid[i] = av_lfg_get(&lfg);
1120 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1121 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1122 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1124 const char *ident = "Lavf";
1125 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1126 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1129 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1130 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1131 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1132 uint8_t date_utc_buf[8];
1133 AV_WB64(date_utc_buf, date_utc);
1134 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1137 // reserve space for the duration
1139 mkv->duration_offset = avio_tell(pb);
1140 put_ebml_void(pb, 11); // assumes double-precision float to be written
1141 end_ebml_master(pb, segment_info);
1143 ret = mkv_write_tracks(s);
1144 if (ret < 0) return ret;
1146 for (i = 0; i < s->nb_chapters; i++)
1147 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1149 if (mkv->mode != MODE_WEBM) {
1150 ret = mkv_write_chapters(s);
1151 if (ret < 0) return ret;
1153 ret = mkv_write_tags(s);
1154 if (ret < 0) return ret;
1156 ret = mkv_write_attachments(s);
1157 if (ret < 0) return ret;
1160 if (!s->pb->seekable)
1161 mkv_write_seekhead(pb, mkv->main_seekhead);
1163 mkv->cues = mkv_start_cues(mkv->segment_offset);
1164 if (mkv->cues == NULL)
1165 return AVERROR(ENOMEM);
1167 if (pb->seekable && mkv->reserve_cues_space) {
1168 mkv->cues_pos = avio_tell(pb);
1169 put_ebml_void(pb, mkv->reserve_cues_space);
1172 av_init_packet(&mkv->cur_audio_pkt);
1173 mkv->cur_audio_pkt.size = 0;
1174 mkv->cluster_pos = -1;
1178 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1179 // after 4k and on a keyframe
1181 if (mkv->cluster_time_limit < 0)
1182 mkv->cluster_time_limit = 5000;
1183 if (mkv->cluster_size_limit < 0)
1184 mkv->cluster_size_limit = 5 * 1024 * 1024;
1186 if (mkv->cluster_time_limit < 0)
1187 mkv->cluster_time_limit = 1000;
1188 if (mkv->cluster_size_limit < 0)
1189 mkv->cluster_size_limit = 32 * 1024;
1195 static int mkv_blockgroup_size(int pkt_size)
1197 int size = pkt_size + 4;
1198 size += ebml_num_size(size);
1199 size += 2; // EBML ID for block and block duration
1200 size += 8; // max size of block duration
1201 size += ebml_num_size(size);
1202 size += 1; // blockgroup EBML ID
1206 static int ass_get_duration(const uint8_t *p)
1208 int sh, sm, ss, sc, eh, em, es, ec;
1209 uint64_t start, end;
1211 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1212 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1214 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1215 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1220 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1222 MatroskaMuxContext *mkv = s->priv_data;
1223 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1224 uint8_t *start, *end, *data = pkt->data;
1225 ebml_master blockgroup;
1229 int duration = ass_get_duration(data);
1230 max_duration = FFMAX(duration, max_duration);
1231 end = memchr(data, '\n', data_size);
1232 size = line_size = end ? end-data+1 : data_size;
1233 size -= end ? (end[-1]=='\r')+1 : 0;
1235 for (i=0; i<3; i++, start++)
1236 if (!(start = memchr(start, ',', size-(start-data))))
1237 return max_duration;
1238 size -= start - data;
1239 sscanf(data, "Dialogue: %d,", &layer);
1240 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1241 s->streams[pkt->stream_index]->nb_frames, layer);
1242 size = FFMIN(i+size, sizeof(buffer));
1243 memcpy(buffer+i, start, size-i);
1245 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1246 "pts %" PRId64 ", duration %d\n",
1247 avio_tell(pb), size, pkt->pts, duration);
1248 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1249 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1250 put_ebml_num(pb, size+4, 0);
1251 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1252 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1254 avio_write(pb, buffer, size);
1255 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1256 end_ebml_master(pb, blockgroup);
1259 data_size -= line_size;
1262 return max_duration;
1266 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1273 dst = av_malloc(srclen);
1275 return AVERROR(ENOMEM);
1277 while (srclen >= WV_HEADER_SIZE) {
1280 ret = ff_wv_parse_header(&header, src);
1283 src += WV_HEADER_SIZE;
1284 srclen -= WV_HEADER_SIZE;
1286 if (srclen < header.blocksize) {
1287 ret = AVERROR_INVALIDDATA;
1291 if (header.initial) {
1292 AV_WL32(dst + offset, header.samples);
1295 AV_WL32(dst + offset, header.flags);
1296 AV_WL32(dst + offset + 4, header.crc);
1299 if (!(header.initial && header.final)) {
1300 AV_WL32(dst + offset, header.blocksize);
1304 memcpy(dst + offset, src, header.blocksize);
1305 src += header.blocksize;
1306 srclen -= header.blocksize;
1307 offset += header.blocksize;
1319 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1320 unsigned int blockid, AVPacket *pkt, int flags)
1322 MatroskaMuxContext *mkv = s->priv_data;
1323 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1324 uint8_t *data = NULL, *side_data = NULL;
1325 int offset = 0, size = pkt->size, side_data_size = 0;
1326 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1327 uint64_t additional_id = 0, discard_padding = 0;
1328 ebml_master block_group, block_additions, block_more;
1330 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1331 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1332 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1333 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1334 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1335 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1336 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1337 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1339 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1345 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1346 /* Matroska specification requires to remove the first QuickTime atom
1352 side_data = av_packet_get_side_data(pkt,
1353 AV_PKT_DATA_SKIP_SAMPLES,
1356 if (side_data && side_data_size >= 10) {
1357 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1358 (AVRational){1, codec->sample_rate},
1359 (AVRational){1, 1000000000});
1362 side_data = av_packet_get_side_data(pkt,
1363 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1366 additional_id = AV_RB64(side_data);
1368 side_data_size -= 8;
1371 if ((side_data_size && additional_id == 1) || discard_padding) {
1372 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1373 blockid = MATROSKA_ID_BLOCK;
1376 put_ebml_id(pb, blockid);
1377 put_ebml_num(pb, size+4, 0);
1378 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1379 avio_wb16(pb, ts - mkv->cluster_pts);
1381 avio_write(pb, data + offset, size);
1382 if (data != pkt->data)
1385 if (discard_padding) {
1386 put_ebml_uint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1389 if (side_data_size && additional_id == 1) {
1390 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1391 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1392 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1393 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1394 put_ebml_num(pb, side_data_size, 0);
1395 avio_write(pb, side_data, side_data_size);
1396 end_ebml_master(pb, block_more);
1397 end_ebml_master(pb, block_additions);
1399 if ((side_data_size && additional_id == 1) || discard_padding) {
1400 end_ebml_master(pb, block_group);
1404 static int srt_get_duration(uint8_t **buf)
1406 int i, duration = 0;
1408 for (i=0; i<2 && !duration; i++) {
1409 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1410 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1411 &s_hour, &s_min, &s_sec, &s_hsec,
1412 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1413 s_min += 60*s_hour; e_min += 60*e_hour;
1414 s_sec += 60*s_min; e_sec += 60*e_min;
1415 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1416 duration = e_hsec - s_hsec;
1418 *buf += ff_subtitles_next_line(*buf);
1423 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1425 ebml_master blockgroup;
1426 AVPacket pkt2 = *pkt;
1427 int64_t duration = srt_get_duration(&pkt2.data);
1428 pkt2.size -= pkt2.data - pkt->data;
1430 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1431 mkv_blockgroup_size(pkt2.size));
1432 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1433 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1434 end_ebml_master(pb, blockgroup);
1439 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1441 MatroskaMuxContext *mkv = s->priv_data;
1442 ebml_master blockgroup;
1443 int id_size, settings_size, size;
1444 uint8_t *id, *settings;
1445 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1446 const int flags = 0;
1449 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1453 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1456 size = id_size + 1 + settings_size + 1 + pkt->size;
1458 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1459 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1460 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1462 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1464 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1465 put_ebml_num(pb, size+4, 0);
1466 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1467 avio_wb16(pb, ts - mkv->cluster_pts);
1469 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1471 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1472 end_ebml_master(pb, blockgroup);
1474 return pkt->duration;
1477 static void mkv_flush_dynbuf(AVFormatContext *s)
1479 MatroskaMuxContext *mkv = s->priv_data;
1486 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1487 avio_write(s->pb, dyn_buf, bufsize);
1492 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1494 MatroskaMuxContext *mkv = s->priv_data;
1495 AVIOContext *pb = s->pb;
1496 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1497 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1498 int duration = pkt->duration;
1500 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1501 int64_t relative_packet_pos;
1503 if (ts == AV_NOPTS_VALUE) {
1504 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1505 return AVERROR(EINVAL);
1508 if (!s->pb->seekable) {
1510 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1511 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1518 if (mkv->cluster_pos == -1) {
1519 mkv->cluster_pos = avio_tell(s->pb);
1520 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1521 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1522 mkv->cluster_pts = FFMAX(0, ts);
1525 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1527 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1528 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1530 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1531 duration = mkv_write_ass_blocks(s, pb, pkt);
1533 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1534 duration = mkv_write_srt_blocks(s, pb, pkt);
1535 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1536 duration = mkv_write_vtt_blocks(s, pb, pkt);
1538 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1539 /* For backward compatibility, prefer convergence_duration. */
1540 if (pkt->convergence_duration > 0) {
1541 duration = pkt->convergence_duration;
1543 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1544 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1545 end_ebml_master(pb, blockgroup);
1548 if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) || codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1549 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos,
1550 codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);
1551 if (ret < 0) return ret;
1554 mkv->duration = FFMAX(mkv->duration, ts + duration);
1558 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1560 MatroskaMuxContext *mkv = s->priv_data;
1561 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1562 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1564 int64_t cluster_time;
1568 if (mkv->tracks[pkt->stream_index].write_dts)
1569 cluster_time = pkt->dts - mkv->cluster_pts;
1571 cluster_time = pkt->pts - mkv->cluster_pts;
1573 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1574 // after 4k and on a keyframe
1575 if (s->pb->seekable) {
1577 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1580 cluster_size = avio_tell(pb);
1583 if (mkv->cluster_pos != -1 &&
1584 (cluster_size > mkv->cluster_size_limit ||
1585 cluster_time > mkv->cluster_time_limit ||
1586 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1587 cluster_size > 4 * 1024))) {
1588 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1589 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1590 avio_tell(pb), pkt->pts, pkt->dts);
1591 end_ebml_master(pb, mkv->cluster);
1592 mkv->cluster_pos = -1;
1594 mkv_flush_dynbuf(s);
1598 // check if we have an audio packet cached
1599 if (mkv->cur_audio_pkt.size > 0) {
1600 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1601 av_free_packet(&mkv->cur_audio_pkt);
1603 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1608 // buffer an audio packet to ensure the packet containing the video
1609 // keyframe's timecode is contained in the same cluster for WebM
1610 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1611 mkv->cur_audio_pkt = *pkt;
1613 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1614 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1616 ret = av_dup_packet(&mkv->cur_audio_pkt);
1617 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1618 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1621 ret = mkv_write_packet_internal(s, pkt);
1625 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1627 MatroskaMuxContext *mkv = s->priv_data;
1629 if (s->pb->seekable)
1634 if (mkv->cluster_pos != -1) {
1635 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1636 " bytes\n", avio_tell(pb));
1637 end_ebml_master(pb, mkv->cluster);
1638 mkv->cluster_pos = -1;
1640 mkv_flush_dynbuf(s);
1645 return mkv_write_packet(s, pkt);
1648 static int mkv_write_trailer(AVFormatContext *s)
1650 MatroskaMuxContext *mkv = s->priv_data;
1651 AVIOContext *pb = s->pb;
1652 int64_t currentpos, cuespos;
1655 // check if we have an audio packet cached
1656 if (mkv->cur_audio_pkt.size > 0) {
1657 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1658 av_free_packet(&mkv->cur_audio_pkt);
1660 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1666 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1667 mkv_flush_dynbuf(s);
1668 } else if (mkv->cluster_pos != -1) {
1669 end_ebml_master(pb, mkv->cluster);
1672 if (mkv->mode != MODE_WEBM) {
1673 ret = mkv_write_chapters(s);
1674 if (ret < 0) return ret;
1678 if (mkv->cues->num_entries) {
1679 if (mkv->reserve_cues_space) {
1682 currentpos = avio_tell(pb);
1683 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1685 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1686 cues_end = avio_tell(pb);
1687 if (cues_end > cuespos + mkv->reserve_cues_space) {
1688 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1689 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1690 cues_end - cuespos);
1691 return AVERROR(EINVAL);
1694 if (cues_end < cuespos + mkv->reserve_cues_space)
1695 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1697 avio_seek(pb, currentpos, SEEK_SET);
1699 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1702 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1703 if (ret < 0) return ret;
1706 mkv_write_seekhead(pb, mkv->main_seekhead);
1708 // update the duration
1709 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1710 currentpos = avio_tell(pb);
1711 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1712 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1714 avio_seek(pb, currentpos, SEEK_SET);
1717 end_ebml_master(pb, mkv->segment);
1718 av_freep(&mkv->tracks);
1719 av_freep(&mkv->cues->entries);
1720 av_freep(&mkv->cues);
1725 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1728 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1729 if (ff_mkv_codec_tags[i].id == codec_id)
1732 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1733 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1734 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1741 static const AVCodecTag additional_audio_tags[] = {
1742 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1743 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1744 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1745 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1746 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1747 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1748 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1749 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1750 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1751 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1752 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1753 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1754 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1757 static const AVCodecTag additional_video_tags[] = {
1758 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1759 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1760 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1761 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1762 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1763 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1766 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1767 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1768 static const AVOption options[] = {
1769 { "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 },
1770 { "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 },
1771 { "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 },
1775 #if CONFIG_MATROSKA_MUXER
1776 static const AVClass matroska_class = {
1777 .class_name = "matroska muxer",
1778 .item_name = av_default_item_name,
1780 .version = LIBAVUTIL_VERSION_INT,
1783 AVOutputFormat ff_matroska_muxer = {
1785 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1786 .mime_type = "video/x-matroska",
1787 .extensions = "mkv",
1788 .priv_data_size = sizeof(MatroskaMuxContext),
1789 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1790 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1791 .video_codec = CONFIG_LIBX264_ENCODER ?
1792 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1793 .write_header = mkv_write_header,
1794 .write_packet = mkv_write_flush_packet,
1795 .write_trailer = mkv_write_trailer,
1796 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1797 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1798 .codec_tag = (const AVCodecTag* const []){
1799 ff_codec_bmp_tags, ff_codec_wav_tags,
1800 additional_audio_tags, additional_video_tags, 0
1803 .subtitle_codec = AV_CODEC_ID_SSA,
1805 .subtitle_codec = AV_CODEC_ID_ASS,
1807 .query_codec = mkv_query_codec,
1808 .priv_class = &matroska_class,
1812 #if CONFIG_WEBM_MUXER
1813 static const AVClass webm_class = {
1814 .class_name = "webm muxer",
1815 .item_name = av_default_item_name,
1817 .version = LIBAVUTIL_VERSION_INT,
1820 AVOutputFormat ff_webm_muxer = {
1822 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1823 .mime_type = "video/webm",
1824 .extensions = "webm",
1825 .priv_data_size = sizeof(MatroskaMuxContext),
1826 .audio_codec = AV_CODEC_ID_VORBIS,
1827 .video_codec = AV_CODEC_ID_VP8,
1828 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1829 .write_header = mkv_write_header,
1830 .write_packet = mkv_write_flush_packet,
1831 .write_trailer = mkv_write_trailer,
1832 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1833 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1834 .priv_class = &webm_class,
1838 #if CONFIG_MATROSKA_AUDIO_MUXER
1839 static const AVClass mka_class = {
1840 .class_name = "matroska audio muxer",
1841 .item_name = av_default_item_name,
1843 .version = LIBAVUTIL_VERSION_INT,
1845 AVOutputFormat ff_matroska_audio_muxer = {
1847 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1848 .mime_type = "audio/x-matroska",
1849 .extensions = "mka",
1850 .priv_data_size = sizeof(MatroskaMuxContext),
1851 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1852 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1853 .video_codec = AV_CODEC_ID_NONE,
1854 .write_header = mkv_write_header,
1855 .write_packet = mkv_write_flush_packet,
1856 .write_trailer = mkv_write_trailer,
1857 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1859 .codec_tag = (const AVCodecTag* const []){
1860 ff_codec_wav_tags, additional_audio_tags, 0
1862 .priv_class = &mka_class,