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
76 int64_t segment_offset;
77 mkv_cuepoint *entries;
86 #define MODE_MATROSKAv2 0x01
87 #define MODE_WEBM 0x02
89 typedef struct MatroskaMuxContext {
94 int64_t segment_offset;
96 int64_t cluster_pos; ///< file offset of the current cluster
98 int64_t duration_offset;
100 mkv_seekhead *main_seekhead;
104 AVPacket cur_audio_pkt;
106 int have_attachments;
108 int reserve_cues_space;
109 int cluster_size_limit;
111 int64_t cluster_time_limit;
113 uint32_t chapter_id_offset;
115 } MatroskaMuxContext;
118 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
119 * offset, 4 bytes for target EBML ID */
120 #define MAX_SEEKENTRY_SIZE 21
122 /** per-cuepoint-track - 4 1-byte EBML IDs, 4 1-byte EBML sizes, 3
124 #define MAX_CUETRACKPOS_SIZE 32
126 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
127 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
129 /** Seek preroll value for opus */
130 #define OPUS_SEEK_PREROLL 80000000
133 static int ebml_id_size(unsigned int id)
135 return (av_log2(id+1)-1)/7+1;
138 static void put_ebml_id(AVIOContext *pb, unsigned int id)
140 int i = ebml_id_size(id);
142 avio_w8(pb, (uint8_t)(id >> (i*8)));
146 * Write an EBML size meaning "unknown size".
148 * @param bytes The number of bytes the size should occupy (maximum: 8).
150 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
152 av_assert0(bytes <= 8);
153 avio_w8(pb, 0x1ff >> bytes);
154 ffio_fill(pb, 0xff, bytes - 1);
158 * Calculate how many bytes are needed to represent a given number in EBML.
160 static int ebml_num_size(uint64_t num)
163 while ((num+1) >> bytes*7) bytes++;
168 * Write a number in EBML variable length format.
170 * @param bytes The number of bytes that need to be used to write the number.
171 * If zero, any number of bytes can be used.
173 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
175 int i, needed_bytes = ebml_num_size(num);
177 // sizes larger than this are currently undefined in EBML
178 av_assert0(num < (1ULL<<56)-1);
181 // don't care how many bytes are used, so use the min
182 bytes = needed_bytes;
183 // the bytes needed to write the given size would exceed the bytes
184 // that we need to use, so write unknown size. This shouldn't happen.
185 av_assert0(bytes >= needed_bytes);
187 num |= 1ULL << bytes*7;
188 for (i = bytes - 1; i >= 0; i--)
189 avio_w8(pb, (uint8_t)(num >> i*8));
192 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
196 while (tmp>>=8) bytes++;
198 put_ebml_id(pb, elementid);
199 put_ebml_num(pb, bytes, 0);
200 for (i = bytes - 1; i >= 0; i--)
201 avio_w8(pb, (uint8_t)(val >> i*8));
204 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
206 put_ebml_id(pb, elementid);
207 put_ebml_num(pb, 8, 0);
208 avio_wb64(pb, av_double2int(val));
211 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
212 const void *buf, int size)
214 put_ebml_id(pb, elementid);
215 put_ebml_num(pb, size, 0);
216 avio_write(pb, buf, size);
219 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
221 put_ebml_binary(pb, elementid, str, strlen(str));
225 * Write a void element of a given size. Useful for reserving space in
226 * the file to be written to later.
228 * @param size The number of bytes to reserve, which must be at least 2.
230 static void put_ebml_void(AVIOContext *pb, uint64_t size)
232 int64_t currentpos = avio_tell(pb);
234 av_assert0(size >= 2);
236 put_ebml_id(pb, EBML_ID_VOID);
237 // we need to subtract the length needed to store the size from the
238 // size we need to reserve so 2 cases, we use 8 bytes to store the
239 // size if possible, 1 byte otherwise
241 put_ebml_num(pb, size-1, 0);
243 put_ebml_num(pb, size-9, 8);
244 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
247 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
249 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
250 put_ebml_id(pb, elementid);
251 put_ebml_size_unknown(pb, bytes);
252 return (ebml_master){ avio_tell(pb), bytes };
255 static void end_ebml_master(AVIOContext *pb, ebml_master master)
257 int64_t pos = avio_tell(pb);
259 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
261 put_ebml_num(pb, pos - master.pos, master.sizebytes);
262 avio_seek(pb, pos, SEEK_SET);
265 static void put_xiph_size(AVIOContext *pb, int size)
267 ffio_fill(pb, 255, size / 255);
268 avio_w8(pb, size % 255);
272 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
273 * elements. If a maximum number of elements is specified, enough space
274 * will be reserved at the current file location to write a seek head of
277 * @param segment_offset The absolute offset to the position in the file
278 * where the segment begins.
279 * @param numelements The maximum number of elements that will be indexed
280 * by this seek head, 0 if unlimited.
282 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
284 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
285 if (new_seekhead == NULL)
288 new_seekhead->segment_offset = segment_offset;
290 if (numelements > 0) {
291 new_seekhead->filepos = avio_tell(pb);
292 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
293 // and size, and 3 bytes to guarantee that an EBML void element
294 // will fit afterwards
295 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
296 new_seekhead->max_entries = numelements;
297 put_ebml_void(pb, new_seekhead->reserved_size);
302 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
304 mkv_seekhead_entry *entries = seekhead->entries;
306 // don't store more elements than we reserved space for
307 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
310 entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
312 return AVERROR(ENOMEM);
313 seekhead->entries = entries;
315 seekhead->entries[seekhead->num_entries].elementid = elementid;
316 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
322 * Write the seek head to the file and free it. If a maximum number of
323 * elements was specified to mkv_start_seekhead(), the seek head will
324 * be written at the location reserved for it. Otherwise, it is written
325 * at the current location in the file.
327 * @return The file offset where the seekhead was written,
328 * -1 if an error occurred.
330 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
332 ebml_master metaseek, seekentry;
336 currentpos = avio_tell(pb);
338 if (seekhead->reserved_size > 0) {
339 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
345 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
346 for (i = 0; i < seekhead->num_entries; i++) {
347 mkv_seekhead_entry *entry = &seekhead->entries[i];
349 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
351 put_ebml_id(pb, MATROSKA_ID_SEEKID);
352 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
353 put_ebml_id(pb, entry->elementid);
355 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
356 end_ebml_master(pb, seekentry);
358 end_ebml_master(pb, metaseek);
360 if (seekhead->reserved_size > 0) {
361 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
362 put_ebml_void(pb, remaining);
363 avio_seek(pb, currentpos, SEEK_SET);
365 currentpos = seekhead->filepos;
368 av_freep(&seekhead->entries);
374 static mkv_cues * mkv_start_cues(int64_t segment_offset)
376 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
380 cues->segment_offset = segment_offset;
384 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos)
386 mkv_cuepoint *entries = cues->entries;
391 entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
393 return AVERROR(ENOMEM);
394 cues->entries = entries;
396 cues->entries[cues->num_entries].pts = ts;
397 cues->entries[cues->num_entries].tracknum = stream + 1;
398 cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
399 cues->entries[cues->num_entries++].relative_pos= relative_pos;
404 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
406 ebml_master cues_element;
410 currentpos = avio_tell(pb);
411 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
413 for (i = 0; i < cues->num_entries; i++) {
414 ebml_master cuepoint, track_positions;
415 mkv_cuepoint *entry = &cues->entries[i];
416 uint64_t pts = entry->pts;
418 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
419 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
421 // put all the entries from different tracks that have the exact same
422 // timestamp into the same CuePoint
423 for (j = 0; j < num_tracks; j++)
424 tracks[j].has_cue = 0;
425 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
426 int tracknum = entry[j].tracknum - 1;
427 av_assert0(tracknum>=0 && tracknum<num_tracks);
428 if (tracks[tracknum].has_cue)
430 tracks[tracknum].has_cue = 1;
431 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
432 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
433 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
434 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
435 end_ebml_master(pb, track_positions);
438 end_ebml_master(pb, cuepoint);
440 end_ebml_master(pb, cues_element);
445 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
447 uint8_t *header_start[3];
449 int first_header_size;
452 if (codec->codec_id == AV_CODEC_ID_VORBIS)
453 first_header_size = 30;
455 first_header_size = 42;
457 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
458 first_header_size, header_start, header_len) < 0) {
459 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
463 avio_w8(pb, 2); // number packets - 1
464 for (j = 0; j < 2; j++) {
465 put_xiph_size(pb, header_len[j]);
467 for (j = 0; j < 3; j++)
468 avio_write(pb, header_start[j], header_len[j]);
473 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
475 if (codec->extradata && codec->extradata_size == 2)
476 avio_write(pb, codec->extradata, 2);
478 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
482 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
484 MPEG4AudioConfig mp4ac;
486 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
487 codec->extradata_size * 8, 1) < 0) {
488 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
492 *sample_rate = mp4ac.sample_rate;
493 *output_sample_rate = mp4ac.ext_sample_rate;
496 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
500 int ret, codecpriv_size;
502 ret = avio_open_dyn_buf(&dyn_cp);
507 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
508 ret = put_xiph_codecpriv(s, dyn_cp, codec);
509 else if (codec->codec_id == AV_CODEC_ID_FLAC)
510 ret = ff_flac_write_header(dyn_cp, codec, 1);
511 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
512 ret = put_wv_codecpriv(dyn_cp, codec);
513 else if (codec->codec_id == AV_CODEC_ID_H264)
514 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
515 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
516 if (codec->extradata_size < 36) {
517 av_log(s, AV_LOG_ERROR,
518 "Invalid extradata found, ALAC expects a 36-byte "
520 ret = AVERROR_INVALIDDATA;
522 avio_write(dyn_cp, codec->extradata + 12,
523 codec->extradata_size - 12);
525 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
526 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
527 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
529 if (!codec->codec_tag)
530 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
531 if (codec->extradata_size)
532 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
534 if (!codec->codec_tag)
535 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
536 if (!codec->codec_tag) {
537 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
538 avcodec_get_name(codec->codec_id));
539 ret = AVERROR(EINVAL);
542 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
545 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
547 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
549 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
550 avcodec_get_name(codec->codec_id));
551 ret = AVERROR(EINVAL);
553 if (!codec->codec_tag)
554 codec->codec_tag = tag;
556 ff_put_wav_header(dyn_cp, codec);
559 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
561 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
566 static int mkv_write_tracks(AVFormatContext *s)
568 MatroskaMuxContext *mkv = s->priv_data;
569 AVIOContext *pb = s->pb;
571 int i, j, ret, default_stream_exists = 0;
573 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
574 if (ret < 0) return ret;
576 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
577 for (i = 0; i < s->nb_streams; i++) {
578 AVStream *st = s->streams[i];
579 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
581 for (i = 0; i < s->nb_streams; i++) {
582 AVStream *st = s->streams[i];
583 AVCodecContext *codec = st->codec;
584 ebml_master subinfo, track;
587 int bit_depth = av_get_bits_per_sample(codec->codec_id);
588 int sample_rate = codec->sample_rate;
589 int output_sample_rate = 0;
590 AVDictionaryEntry *tag;
592 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
593 mkv->have_attachments = 1;
598 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
600 bit_depth = codec->bits_per_coded_sample;
602 if (codec->codec_id == AV_CODEC_ID_AAC)
603 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
605 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
606 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
607 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
608 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
610 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
611 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
612 tag = av_dict_get(st->metadata, "language", NULL, 0);
613 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
614 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
615 } else if (tag && tag->value) {
616 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
619 // The default value for TRACKFLAGDEFAULT is 1, so add element
620 // if we need to clear it.
621 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
622 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
624 if (st->disposition & AV_DISPOSITION_FORCED)
625 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
627 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
628 const char *codec_id;
629 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
630 codec_id = "D_WEBVTT/CAPTIONS";
631 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
632 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
633 codec_id = "D_WEBVTT/DESCRIPTIONS";
634 native_id = MATROSKA_TRACK_TYPE_METADATA;
635 } else if (st->disposition & AV_DISPOSITION_METADATA) {
636 codec_id = "D_WEBVTT/METADATA";
637 native_id = MATROSKA_TRACK_TYPE_METADATA;
639 codec_id = "D_WEBVTT/SUBTITLES";
640 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
642 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
644 // look for a codec ID string specific to mkv to use,
645 // if none are found, use AVI codes
646 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
647 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
648 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
655 if (codec->codec_id == AV_CODEC_ID_OPUS) {
656 uint64_t codec_delay =av_rescale_q(codec->delay,
657 (AVRational){1, codec->sample_rate},
658 (AVRational){1, 1000000000});
659 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codec_delay);
660 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
664 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
665 codec->codec_id == AV_CODEC_ID_VP9 ||
666 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
667 codec->codec_id == AV_CODEC_ID_VORBIS ||
668 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
669 av_log(s, AV_LOG_ERROR,
670 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
671 return AVERROR(EINVAL);
674 switch (codec->codec_type) {
675 case AVMEDIA_TYPE_VIDEO:
676 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
677 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
678 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
680 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
683 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
684 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
685 || codec->codec_id == AV_CODEC_ID_SVQ1
686 || codec->codec_id == AV_CODEC_ID_SVQ3
687 || codec->codec_id == AV_CODEC_ID_CINEPAK))
691 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
692 else if (!native_id) {
693 // if there is no mkv-specific codec ID, use VFW mode
694 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
695 mkv->tracks[i].write_dts = 1;
698 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
699 // XXX: interlace flag?
700 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
701 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
703 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
704 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
705 // save stereo mode flag
706 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
708 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
709 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
714 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
715 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
716 av_log(s, AV_LOG_ERROR,
717 "The specified stereo mode is not valid.\n");
718 return AVERROR(EINVAL);
720 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
723 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
724 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
725 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
726 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
729 if (st->sample_aspect_ratio.num) {
730 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
731 if (d_width > INT_MAX) {
732 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
733 return AVERROR(EINVAL);
735 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
736 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
739 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
740 uint32_t color_space = av_le2ne32(codec->codec_tag);
741 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
743 end_ebml_master(pb, subinfo);
746 case AVMEDIA_TYPE_AUDIO:
747 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
750 // no mkv-specific ID, use ACM mode
751 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
753 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
754 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
755 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
756 if (output_sample_rate)
757 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
759 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
760 end_ebml_master(pb, subinfo);
763 case AVMEDIA_TYPE_SUBTITLE:
765 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
766 return AVERROR(ENOSYS);
769 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
770 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
772 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
775 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
776 return AVERROR(EINVAL);
779 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
780 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
781 if (ret < 0) return ret;
784 end_ebml_master(pb, track);
786 // ms precision is the de-facto standard timescale for mkv files
787 avpriv_set_pts_info(st, 64, 1, 1000);
789 end_ebml_master(pb, tracks);
793 static int mkv_write_chapters(AVFormatContext *s)
795 MatroskaMuxContext *mkv = s->priv_data;
796 AVIOContext *pb = s->pb;
797 ebml_master chapters, editionentry;
798 AVRational scale = {1, 1E9};
801 if (!s->nb_chapters || mkv->wrote_chapters)
804 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
805 if (ret < 0) return ret;
807 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
808 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
809 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
810 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
811 for (i = 0; i < s->nb_chapters; i++) {
812 ebml_master chapteratom, chapterdisplay;
813 AVChapter *c = s->chapters[i];
814 AVDictionaryEntry *t = NULL;
816 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
817 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
818 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
819 av_rescale_q(c->start, c->time_base, scale));
820 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
821 av_rescale_q(c->end, c->time_base, scale));
822 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
823 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
824 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
825 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
826 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
827 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
828 end_ebml_master(pb, chapterdisplay);
830 end_ebml_master(pb, chapteratom);
832 end_ebml_master(pb, editionentry);
833 end_ebml_master(pb, chapters);
835 mkv->wrote_chapters = 1;
839 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
841 uint8_t *key = av_strdup(t->key);
843 const uint8_t *lang = NULL;
846 if ((p = strrchr(p, '-')) &&
847 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
854 else if (*p >= 'a' && *p <= 'z')
859 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
860 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
862 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
863 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
864 end_ebml_master(pb, tag);
869 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
870 unsigned int uid, ebml_master *tags)
872 MatroskaMuxContext *mkv = s->priv_data;
873 ebml_master tag, targets;
874 AVDictionaryEntry *t = NULL;
878 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
879 if (ret < 0) return ret;
881 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
884 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
885 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
887 put_ebml_uint(s->pb, elementid, uid);
888 end_ebml_master(s->pb, targets);
890 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
891 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
892 mkv_write_simpletag(s->pb, t);
894 end_ebml_master(s->pb, tag);
898 static int mkv_check_tag(AVDictionary *m)
900 AVDictionaryEntry *t = NULL;
902 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
903 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
909 static int mkv_write_tags(AVFormatContext *s)
911 MatroskaMuxContext *mkv = s->priv_data;
912 ebml_master tags = {0};
915 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
917 if (mkv_check_tag(s->metadata)) {
918 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
919 if (ret < 0) return ret;
922 for (i = 0; i < s->nb_streams; i++) {
923 AVStream *st = s->streams[i];
925 if (!mkv_check_tag(st->metadata))
928 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
929 if (ret < 0) return ret;
932 for (i = 0; i < s->nb_chapters; i++) {
933 AVChapter *ch = s->chapters[i];
935 if (!mkv_check_tag(ch->metadata))
938 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
939 if (ret < 0) return ret;
943 end_ebml_master(s->pb, tags);
947 static int mkv_write_attachments(AVFormatContext *s)
949 MatroskaMuxContext *mkv = s->priv_data;
950 AVIOContext *pb = s->pb;
951 ebml_master attachments;
955 if (!mkv->have_attachments)
958 av_lfg_init(&c, av_get_random_seed());
960 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
961 if (ret < 0) return ret;
963 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
965 for (i = 0; i < s->nb_streams; i++) {
966 AVStream *st = s->streams[i];
967 ebml_master attached_file;
968 AVDictionaryEntry *t;
969 const char *mimetype = NULL;
972 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
975 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
977 if (t = av_dict_get(st->metadata, "title", NULL, 0))
978 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
979 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
980 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
981 return AVERROR(EINVAL);
983 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
984 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
986 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
988 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
989 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
990 mimetype = ff_mkv_mime_tags[i].str;
995 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
996 "it cannot be deduced from the codec id.\n", i);
997 return AVERROR(EINVAL);
1000 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
1001 struct AVSHA *sha = av_sha_alloc();
1004 return AVERROR(ENOMEM);
1005 av_sha_init(sha, 160);
1006 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1007 av_sha_final(sha, digest);
1009 fileuid = AV_RL64(digest);
1011 fileuid = av_lfg_get(&c);
1013 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1016 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1017 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1018 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1019 end_ebml_master(pb, attached_file);
1021 end_ebml_master(pb, attachments);
1026 static int mkv_write_header(AVFormatContext *s)
1028 MatroskaMuxContext *mkv = s->priv_data;
1029 AVIOContext *pb = s->pb;
1030 ebml_master ebml_header, segment_info;
1031 AVDictionaryEntry *tag;
1034 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1035 else mkv->mode = MODE_MATROSKAv2;
1037 if (s->avoid_negative_ts < 0)
1038 s->avoid_negative_ts = 1;
1040 for (i = 0; i < s->nb_streams; i++)
1041 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1042 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1043 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1044 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1045 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1046 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1047 av_log(s, AV_LOG_ERROR,
1048 "The Matroska muxer does not yet support muxing %s\n",
1049 avcodec_get_name(s->streams[i]->codec->codec_id));
1050 return AVERROR_PATCHWELCOME;
1053 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1055 return AVERROR(ENOMEM);
1057 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1058 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1059 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1060 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1061 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1062 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1063 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
1064 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1065 end_ebml_master(pb, ebml_header);
1067 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1068 mkv->segment_offset = avio_tell(pb);
1070 // we write 2 seek heads - one at the end of the file to point to each
1071 // cluster, and one at the beginning to point to all other level one
1072 // elements (including the seek head at the end of the file), which
1073 // isn't more than 10 elements if we only write one of each other
1074 // currently defined level 1 element
1075 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1076 if (!mkv->main_seekhead)
1077 return AVERROR(ENOMEM);
1079 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1080 if (ret < 0) return ret;
1082 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1083 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1084 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1085 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1086 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1087 uint32_t segment_uid[4];
1090 av_lfg_init(&lfg, av_get_random_seed());
1092 for (i = 0; i < 4; i++)
1093 segment_uid[i] = av_lfg_get(&lfg);
1095 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1096 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1097 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1100 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1101 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1102 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1103 uint8_t date_utc_buf[8];
1104 AV_WB64(date_utc_buf, date_utc);
1105 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1108 // reserve space for the duration
1110 mkv->duration_offset = avio_tell(pb);
1111 put_ebml_void(pb, 11); // assumes double-precision float to be written
1112 end_ebml_master(pb, segment_info);
1114 ret = mkv_write_tracks(s);
1115 if (ret < 0) return ret;
1117 for (i = 0; i < s->nb_chapters; i++)
1118 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1120 if (mkv->mode != MODE_WEBM) {
1121 ret = mkv_write_chapters(s);
1122 if (ret < 0) return ret;
1124 ret = mkv_write_tags(s);
1125 if (ret < 0) return ret;
1127 ret = mkv_write_attachments(s);
1128 if (ret < 0) return ret;
1131 if (!s->pb->seekable)
1132 mkv_write_seekhead(pb, mkv->main_seekhead);
1134 mkv->cues = mkv_start_cues(mkv->segment_offset);
1135 if (mkv->cues == NULL)
1136 return AVERROR(ENOMEM);
1138 if (pb->seekable && mkv->reserve_cues_space) {
1139 mkv->cues_pos = avio_tell(pb);
1140 put_ebml_void(pb, mkv->reserve_cues_space);
1143 av_init_packet(&mkv->cur_audio_pkt);
1144 mkv->cur_audio_pkt.size = 0;
1145 mkv->cluster_pos = -1;
1149 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1150 // after 4k and on a keyframe
1152 if (mkv->cluster_time_limit < 0)
1153 mkv->cluster_time_limit = 5000;
1154 if (mkv->cluster_size_limit < 0)
1155 mkv->cluster_size_limit = 5 * 1024 * 1024;
1157 if (mkv->cluster_time_limit < 0)
1158 mkv->cluster_time_limit = 1000;
1159 if (mkv->cluster_size_limit < 0)
1160 mkv->cluster_size_limit = 32 * 1024;
1166 static int mkv_blockgroup_size(int pkt_size)
1168 int size = pkt_size + 4;
1169 size += ebml_num_size(size);
1170 size += 2; // EBML ID for block and block duration
1171 size += 8; // max size of block duration
1172 size += ebml_num_size(size);
1173 size += 1; // blockgroup EBML ID
1177 static int ass_get_duration(const uint8_t *p)
1179 int sh, sm, ss, sc, eh, em, es, ec;
1180 uint64_t start, end;
1182 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1183 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1185 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1186 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1191 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1193 MatroskaMuxContext *mkv = s->priv_data;
1194 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1195 uint8_t *start, *end, *data = pkt->data;
1196 ebml_master blockgroup;
1200 int duration = ass_get_duration(data);
1201 max_duration = FFMAX(duration, max_duration);
1202 end = memchr(data, '\n', data_size);
1203 size = line_size = end ? end-data+1 : data_size;
1204 size -= end ? (end[-1]=='\r')+1 : 0;
1206 for (i=0; i<3; i++, start++)
1207 if (!(start = memchr(start, ',', size-(start-data))))
1208 return max_duration;
1209 size -= start - data;
1210 sscanf(data, "Dialogue: %d,", &layer);
1211 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1212 s->streams[pkt->stream_index]->nb_frames, layer);
1213 size = FFMIN(i+size, sizeof(buffer));
1214 memcpy(buffer+i, start, size-i);
1216 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1217 "pts %" PRId64 ", duration %d\n",
1218 avio_tell(pb), size, pkt->pts, duration);
1219 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1220 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1221 put_ebml_num(pb, size+4, 0);
1222 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1223 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1225 avio_write(pb, buffer, size);
1226 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1227 end_ebml_master(pb, blockgroup);
1230 data_size -= line_size;
1233 return max_duration;
1237 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1244 dst = av_malloc(srclen);
1246 return AVERROR(ENOMEM);
1248 while (srclen >= WV_HEADER_SIZE) {
1251 ret = ff_wv_parse_header(&header, src);
1254 src += WV_HEADER_SIZE;
1255 srclen -= WV_HEADER_SIZE;
1257 if (srclen < header.blocksize) {
1258 ret = AVERROR_INVALIDDATA;
1262 if (header.initial) {
1263 AV_WL32(dst + offset, header.samples);
1266 AV_WL32(dst + offset, header.flags);
1267 AV_WL32(dst + offset + 4, header.crc);
1270 if (!(header.initial && header.final)) {
1271 AV_WL32(dst + offset, header.blocksize);
1275 memcpy(dst + offset, src, header.blocksize);
1276 src += header.blocksize;
1277 srclen -= header.blocksize;
1278 offset += header.blocksize;
1290 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1291 unsigned int blockid, AVPacket *pkt, int flags)
1293 MatroskaMuxContext *mkv = s->priv_data;
1294 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1295 uint8_t *data = NULL, *side_data = NULL;
1296 int offset = 0, size = pkt->size, side_data_size = 0;
1297 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1298 uint64_t additional_id = 0, discard_padding = 0;
1299 ebml_master block_group, block_additions, block_more;
1301 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1302 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1303 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1304 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1305 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1306 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1307 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1308 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1310 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1316 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1317 /* Matroska specification requires to remove the first QuickTime atom
1323 side_data = av_packet_get_side_data(pkt,
1324 AV_PKT_DATA_SKIP_SAMPLES,
1327 if (side_data && side_data_size >= 10) {
1328 discard_padding = av_rescale_q(AV_RL32(side_data + 4),
1329 (AVRational){1, codec->sample_rate},
1330 (AVRational){1, 1000000000});
1333 side_data = av_packet_get_side_data(pkt,
1334 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1337 additional_id = AV_RB64(side_data);
1339 side_data_size -= 8;
1342 if ((side_data_size && additional_id == 1) || discard_padding) {
1343 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1344 blockid = MATROSKA_ID_BLOCK;
1347 put_ebml_id(pb, blockid);
1348 put_ebml_num(pb, size+4, 0);
1349 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1350 avio_wb16(pb, ts - mkv->cluster_pts);
1352 avio_write(pb, data + offset, size);
1353 if (data != pkt->data)
1356 if (discard_padding) {
1357 put_ebml_uint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
1360 if (side_data_size && additional_id == 1) {
1361 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1362 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1363 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1364 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1365 put_ebml_num(pb, side_data_size, 0);
1366 avio_write(pb, side_data, side_data_size);
1367 end_ebml_master(pb, block_more);
1368 end_ebml_master(pb, block_additions);
1370 if ((side_data_size && additional_id == 1) || discard_padding) {
1371 end_ebml_master(pb, block_group);
1375 static int srt_get_duration(uint8_t **buf)
1377 int i, duration = 0;
1379 for (i=0; i<2 && !duration; i++) {
1380 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1381 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1382 &s_hour, &s_min, &s_sec, &s_hsec,
1383 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1384 s_min += 60*s_hour; e_min += 60*e_hour;
1385 s_sec += 60*s_min; e_sec += 60*e_min;
1386 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1387 duration = e_hsec - s_hsec;
1389 *buf += ff_subtitles_next_line(*buf);
1394 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1396 ebml_master blockgroup;
1397 AVPacket pkt2 = *pkt;
1398 int64_t duration = srt_get_duration(&pkt2.data);
1399 pkt2.size -= pkt2.data - pkt->data;
1401 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1402 mkv_blockgroup_size(pkt2.size));
1403 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1404 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1405 end_ebml_master(pb, blockgroup);
1410 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1412 MatroskaMuxContext *mkv = s->priv_data;
1413 ebml_master blockgroup;
1414 int id_size, settings_size, size;
1415 uint8_t *id, *settings;
1416 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1417 const int flags = 0;
1420 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1424 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1427 size = id_size + 1 + settings_size + 1 + pkt->size;
1429 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1430 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1431 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1433 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1435 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1436 put_ebml_num(pb, size+4, 0);
1437 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1438 avio_wb16(pb, ts - mkv->cluster_pts);
1440 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1442 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1443 end_ebml_master(pb, blockgroup);
1445 return pkt->duration;
1448 static void mkv_flush_dynbuf(AVFormatContext *s)
1450 MatroskaMuxContext *mkv = s->priv_data;
1457 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1458 avio_write(s->pb, dyn_buf, bufsize);
1463 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1465 MatroskaMuxContext *mkv = s->priv_data;
1466 AVIOContext *pb = s->pb;
1467 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1468 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1469 int duration = pkt->duration;
1471 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1472 int64_t relative_packet_pos;
1474 if (ts == AV_NOPTS_VALUE) {
1475 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1476 return AVERROR(EINVAL);
1479 if (!s->pb->seekable) {
1481 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1482 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1489 if (mkv->cluster_pos == -1) {
1490 mkv->cluster_pos = avio_tell(s->pb);
1491 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1492 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1493 mkv->cluster_pts = FFMAX(0, ts);
1496 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1498 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1499 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1501 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1502 duration = mkv_write_ass_blocks(s, pb, pkt);
1504 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1505 duration = mkv_write_srt_blocks(s, pb, pkt);
1506 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1507 duration = mkv_write_vtt_blocks(s, pb, pkt);
1509 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1510 /* For backward compatibility, prefer convergence_duration. */
1511 if (pkt->convergence_duration > 0) {
1512 duration = pkt->convergence_duration;
1514 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1515 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1516 end_ebml_master(pb, blockgroup);
1519 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1520 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos);
1521 if (ret < 0) return ret;
1524 mkv->duration = FFMAX(mkv->duration, ts + duration);
1528 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1530 MatroskaMuxContext *mkv = s->priv_data;
1531 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1532 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1534 int64_t cluster_time;
1538 if (mkv->tracks[pkt->stream_index].write_dts)
1539 cluster_time = pkt->dts - mkv->cluster_pts;
1541 cluster_time = pkt->pts - mkv->cluster_pts;
1543 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1544 // after 4k and on a keyframe
1545 if (s->pb->seekable) {
1547 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1550 cluster_size = avio_tell(pb);
1553 if (mkv->cluster_pos != -1 &&
1554 (cluster_size > mkv->cluster_size_limit ||
1555 cluster_time > mkv->cluster_time_limit ||
1556 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1557 cluster_size > 4 * 1024))) {
1558 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1559 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1560 avio_tell(pb), pkt->pts, pkt->dts);
1561 end_ebml_master(pb, mkv->cluster);
1562 mkv->cluster_pos = -1;
1564 mkv_flush_dynbuf(s);
1568 // check if we have an audio packet cached
1569 if (mkv->cur_audio_pkt.size > 0) {
1570 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1571 av_free_packet(&mkv->cur_audio_pkt);
1573 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1578 // buffer an audio packet to ensure the packet containing the video
1579 // keyframe's timecode is contained in the same cluster for WebM
1580 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1581 mkv->cur_audio_pkt = *pkt;
1583 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1584 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1586 ret = av_dup_packet(&mkv->cur_audio_pkt);
1587 if (mkv->cur_audio_pkt.side_data_elems > 0) {
1588 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);
1591 ret = mkv_write_packet_internal(s, pkt);
1595 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1597 MatroskaMuxContext *mkv = s->priv_data;
1599 if (s->pb->seekable)
1604 if (mkv->cluster_pos != -1) {
1605 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1606 " bytes\n", avio_tell(pb));
1607 end_ebml_master(pb, mkv->cluster);
1608 mkv->cluster_pos = -1;
1610 mkv_flush_dynbuf(s);
1615 return mkv_write_packet(s, pkt);
1618 static int mkv_write_trailer(AVFormatContext *s)
1620 MatroskaMuxContext *mkv = s->priv_data;
1621 AVIOContext *pb = s->pb;
1622 int64_t currentpos, cuespos;
1625 // check if we have an audio packet cached
1626 if (mkv->cur_audio_pkt.size > 0) {
1627 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1628 av_free_packet(&mkv->cur_audio_pkt);
1630 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1636 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1637 mkv_flush_dynbuf(s);
1638 } else if (mkv->cluster_pos != -1) {
1639 end_ebml_master(pb, mkv->cluster);
1642 if (mkv->mode != MODE_WEBM) {
1643 ret = mkv_write_chapters(s);
1644 if (ret < 0) return ret;
1648 if (mkv->cues->num_entries) {
1649 if (mkv->reserve_cues_space) {
1652 currentpos = avio_tell(pb);
1653 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1655 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1656 cues_end = avio_tell(pb);
1657 if (cues_end > cuespos + mkv->reserve_cues_space) {
1658 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1659 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1660 cues_end - cuespos);
1661 return AVERROR(EINVAL);
1664 if (cues_end < cuespos + mkv->reserve_cues_space)
1665 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1667 avio_seek(pb, currentpos, SEEK_SET);
1669 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1672 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1673 if (ret < 0) return ret;
1676 mkv_write_seekhead(pb, mkv->main_seekhead);
1678 // update the duration
1679 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1680 currentpos = avio_tell(pb);
1681 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1682 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1684 avio_seek(pb, currentpos, SEEK_SET);
1687 end_ebml_master(pb, mkv->segment);
1688 av_freep(&mkv->tracks);
1689 av_freep(&mkv->cues->entries);
1690 av_freep(&mkv->cues);
1695 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1698 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1699 if (ff_mkv_codec_tags[i].id == codec_id)
1702 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1703 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1704 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1711 static const AVCodecTag additional_audio_tags[] = {
1712 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1713 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1714 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1715 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1716 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1717 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1718 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1719 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1720 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1721 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1722 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1723 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1724 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1727 static const AVCodecTag additional_video_tags[] = {
1728 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1729 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1730 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1731 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1732 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1733 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1736 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1737 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1738 static const AVOption options[] = {
1739 { "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 },
1740 { "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 },
1741 { "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 },
1745 #if CONFIG_MATROSKA_MUXER
1746 static const AVClass matroska_class = {
1747 .class_name = "matroska muxer",
1748 .item_name = av_default_item_name,
1750 .version = LIBAVUTIL_VERSION_INT,
1753 AVOutputFormat ff_matroska_muxer = {
1755 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1756 .mime_type = "video/x-matroska",
1757 .extensions = "mkv",
1758 .priv_data_size = sizeof(MatroskaMuxContext),
1759 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1760 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1761 .video_codec = CONFIG_LIBX264_ENCODER ?
1762 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1763 .write_header = mkv_write_header,
1764 .write_packet = mkv_write_flush_packet,
1765 .write_trailer = mkv_write_trailer,
1766 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1767 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1768 .codec_tag = (const AVCodecTag* const []){
1769 ff_codec_bmp_tags, ff_codec_wav_tags,
1770 additional_audio_tags, additional_video_tags, 0
1773 .subtitle_codec = AV_CODEC_ID_SSA,
1775 .subtitle_codec = AV_CODEC_ID_ASS,
1777 .query_codec = mkv_query_codec,
1778 .priv_class = &matroska_class,
1782 #if CONFIG_WEBM_MUXER
1783 static const AVClass webm_class = {
1784 .class_name = "webm muxer",
1785 .item_name = av_default_item_name,
1787 .version = LIBAVUTIL_VERSION_INT,
1790 AVOutputFormat ff_webm_muxer = {
1792 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1793 .mime_type = "video/webm",
1794 .extensions = "webm",
1795 .priv_data_size = sizeof(MatroskaMuxContext),
1796 .audio_codec = AV_CODEC_ID_VORBIS,
1797 .video_codec = AV_CODEC_ID_VP8,
1798 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1799 .write_header = mkv_write_header,
1800 .write_packet = mkv_write_flush_packet,
1801 .write_trailer = mkv_write_trailer,
1802 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1803 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1804 .priv_class = &webm_class,
1808 #if CONFIG_MATROSKA_AUDIO_MUXER
1809 static const AVClass mka_class = {
1810 .class_name = "matroska audio muxer",
1811 .item_name = av_default_item_name,
1813 .version = LIBAVUTIL_VERSION_INT,
1815 AVOutputFormat ff_matroska_audio_muxer = {
1817 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1818 .mime_type = "audio/x-matroska",
1819 .extensions = "mka",
1820 .priv_data_size = sizeof(MatroskaMuxContext),
1821 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1822 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1823 .video_codec = AV_CODEC_ID_NONE,
1824 .write_header = mkv_write_header,
1825 .write_packet = mkv_write_flush_packet,
1826 .write_trailer = mkv_write_trailer,
1827 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1829 .codec_tag = (const AVCodecTag* const []){
1830 ff_codec_wav_tags, additional_audio_tags, 0
1832 .priv_class = &mka_class,