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"
33 #include "libavutil/avstring.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/intfloat.h"
36 #include "libavutil/intreadwrite.h"
37 #include "libavutil/lfg.h"
38 #include "libavutil/mathematics.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/random_seed.h"
41 #include "libavutil/samplefmt.h"
42 #include "libavutil/sha.h"
44 #include "libavcodec/xiph.h"
45 #include "libavcodec/mpeg4audio.h"
47 typedef struct ebml_master {
48 int64_t pos; ///< absolute offset in the file where the master's elements start
49 int sizebytes; ///< how many bytes were reserved for the size
52 typedef struct mkv_seekhead_entry {
53 unsigned int elementid;
57 typedef struct mkv_seekhead {
59 int64_t segment_offset; ///< the file offset to the beginning of the segment
60 int reserved_size; ///< -1 if appending to file
62 mkv_seekhead_entry *entries;
69 int64_t cluster_pos; ///< file offset of the cluster containing the block
73 int64_t segment_offset;
74 mkv_cuepoint *entries;
83 #define MODE_MATROSKAv2 0x01
84 #define MODE_WEBM 0x02
86 typedef struct MatroskaMuxContext {
91 int64_t segment_offset;
93 int64_t cluster_pos; ///< file offset of the current cluster
95 int64_t duration_offset;
97 mkv_seekhead *main_seekhead;
101 AVPacket cur_audio_pkt;
103 int have_attachments;
105 int reserve_cues_space;
107 } MatroskaMuxContext;
110 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
111 * offset, 4 bytes for target EBML ID */
112 #define MAX_SEEKENTRY_SIZE 21
114 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
116 #define MAX_CUETRACKPOS_SIZE 22
118 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
119 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
122 static int ebml_id_size(unsigned int id)
124 return (av_log2(id+1)-1)/7+1;
127 static void put_ebml_id(AVIOContext *pb, unsigned int id)
129 int i = ebml_id_size(id);
131 avio_w8(pb, (uint8_t)(id >> (i*8)));
135 * Write an EBML size meaning "unknown size".
137 * @param bytes The number of bytes the size should occupy (maximum: 8).
139 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
141 av_assert0(bytes <= 8);
142 avio_w8(pb, 0x1ff >> bytes);
143 ffio_fill(pb, 0xff, bytes - 1);
147 * Calculate how many bytes are needed to represent a given number in EBML.
149 static int ebml_num_size(uint64_t num)
152 while ((num+1) >> bytes*7) bytes++;
157 * Write a number in EBML variable length format.
159 * @param bytes The number of bytes that need to be used to write the number.
160 * If zero, any number of bytes can be used.
162 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
164 int i, needed_bytes = ebml_num_size(num);
166 // sizes larger than this are currently undefined in EBML
167 av_assert0(num < (1ULL<<56)-1);
170 // don't care how many bytes are used, so use the min
171 bytes = needed_bytes;
172 // the bytes needed to write the given size would exceed the bytes
173 // that we need to use, so write unknown size. This shouldn't happen.
174 av_assert0(bytes >= needed_bytes);
176 num |= 1ULL << bytes*7;
177 for (i = bytes - 1; i >= 0; i--)
178 avio_w8(pb, (uint8_t)(num >> i*8));
181 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
185 while (tmp>>=8) bytes++;
187 put_ebml_id(pb, elementid);
188 put_ebml_num(pb, bytes, 0);
189 for (i = bytes - 1; i >= 0; i--)
190 avio_w8(pb, (uint8_t)(val >> i*8));
193 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
195 put_ebml_id(pb, elementid);
196 put_ebml_num(pb, 8, 0);
197 avio_wb64(pb, av_double2int(val));
200 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
201 const void *buf, int size)
203 put_ebml_id(pb, elementid);
204 put_ebml_num(pb, size, 0);
205 avio_write(pb, buf, size);
208 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
210 put_ebml_binary(pb, elementid, str, strlen(str));
214 * Write a void element of a given size. Useful for reserving space in
215 * the file to be written to later.
217 * @param size The number of bytes to reserve, which must be at least 2.
219 static void put_ebml_void(AVIOContext *pb, uint64_t size)
221 int64_t currentpos = avio_tell(pb);
223 av_assert0(size >= 2);
225 put_ebml_id(pb, EBML_ID_VOID);
226 // we need to subtract the length needed to store the size from the
227 // size we need to reserve so 2 cases, we use 8 bytes to store the
228 // size if possible, 1 byte otherwise
230 put_ebml_num(pb, size-1, 0);
232 put_ebml_num(pb, size-9, 8);
233 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
236 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
238 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
239 put_ebml_id(pb, elementid);
240 put_ebml_size_unknown(pb, bytes);
241 return (ebml_master){ avio_tell(pb), bytes };
244 static void end_ebml_master(AVIOContext *pb, ebml_master master)
246 int64_t pos = avio_tell(pb);
248 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
250 put_ebml_num(pb, pos - master.pos, master.sizebytes);
251 avio_seek(pb, pos, SEEK_SET);
254 static void put_xiph_size(AVIOContext *pb, int size)
256 ffio_fill(pb, 255, size / 255);
257 avio_w8(pb, size % 255);
261 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
262 * elements. If a maximum number of elements is specified, enough space
263 * will be reserved at the current file location to write a seek head of
266 * @param segment_offset The absolute offset to the position in the file
267 * where the segment begins.
268 * @param numelements The maximum number of elements that will be indexed
269 * by this seek head, 0 if unlimited.
271 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
273 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
274 if (new_seekhead == NULL)
277 new_seekhead->segment_offset = segment_offset;
279 if (numelements > 0) {
280 new_seekhead->filepos = avio_tell(pb);
281 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
282 // and size, and 3 bytes to guarantee that an EBML void element
283 // will fit afterwards
284 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
285 new_seekhead->max_entries = numelements;
286 put_ebml_void(pb, new_seekhead->reserved_size);
291 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
293 mkv_seekhead_entry *entries = seekhead->entries;
295 // don't store more elements than we reserved space for
296 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
299 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
301 return AVERROR(ENOMEM);
303 entries[seekhead->num_entries ].elementid = elementid;
304 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
306 seekhead->entries = entries;
311 * Write the seek head to the file and free it. If a maximum number of
312 * elements was specified to mkv_start_seekhead(), the seek head will
313 * be written at the location reserved for it. Otherwise, it is written
314 * at the current location in the file.
316 * @return The file offset where the seekhead was written,
317 * -1 if an error occurred.
319 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
321 ebml_master metaseek, seekentry;
325 currentpos = avio_tell(pb);
327 if (seekhead->reserved_size > 0) {
328 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
334 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
335 for (i = 0; i < seekhead->num_entries; i++) {
336 mkv_seekhead_entry *entry = &seekhead->entries[i];
338 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
340 put_ebml_id(pb, MATROSKA_ID_SEEKID);
341 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
342 put_ebml_id(pb, entry->elementid);
344 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
345 end_ebml_master(pb, seekentry);
347 end_ebml_master(pb, metaseek);
349 if (seekhead->reserved_size > 0) {
350 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
351 put_ebml_void(pb, remaining);
352 avio_seek(pb, currentpos, SEEK_SET);
354 currentpos = seekhead->filepos;
357 av_free(seekhead->entries);
363 static mkv_cues * mkv_start_cues(int64_t segment_offset)
365 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
369 cues->segment_offset = segment_offset;
373 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
375 mkv_cuepoint *entries = cues->entries;
380 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
382 return AVERROR(ENOMEM);
384 entries[cues->num_entries ].pts = ts;
385 entries[cues->num_entries ].tracknum = stream + 1;
386 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
388 cues->entries = entries;
392 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
394 ebml_master cues_element;
398 currentpos = avio_tell(pb);
399 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
401 for (i = 0; i < cues->num_entries; i++) {
402 ebml_master cuepoint, track_positions;
403 mkv_cuepoint *entry = &cues->entries[i];
404 uint64_t pts = entry->pts;
406 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
407 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
409 // put all the entries from different tracks that have the exact same
410 // timestamp into the same CuePoint
411 for (j = 0; j < num_tracks; j++)
412 tracks[j].has_cue = 0;
413 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
414 int tracknum = entry[j].tracknum - 1;
415 av_assert0(tracknum>=0 && tracknum<num_tracks);
416 if (tracks[tracknum].has_cue)
418 tracks[tracknum].has_cue = 1;
419 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
420 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
421 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
422 end_ebml_master(pb, track_positions);
425 end_ebml_master(pb, cuepoint);
427 end_ebml_master(pb, cues_element);
432 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
434 uint8_t *header_start[3];
436 int first_header_size;
439 if (codec->codec_id == AV_CODEC_ID_VORBIS)
440 first_header_size = 30;
442 first_header_size = 42;
444 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
445 first_header_size, header_start, header_len) < 0) {
446 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
450 avio_w8(pb, 2); // number packets - 1
451 for (j = 0; j < 2; j++) {
452 put_xiph_size(pb, header_len[j]);
454 for (j = 0; j < 3; j++)
455 avio_write(pb, header_start[j], header_len[j]);
460 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
462 if (codec->extradata && codec->extradata_size == 2)
463 avio_write(pb, codec->extradata, 2);
465 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
469 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
471 MPEG4AudioConfig mp4ac;
473 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
474 codec->extradata_size * 8, 1) < 0) {
475 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
479 *sample_rate = mp4ac.sample_rate;
480 *output_sample_rate = mp4ac.ext_sample_rate;
483 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
487 int ret, codecpriv_size;
489 ret = avio_open_dyn_buf(&dyn_cp);
494 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
495 ret = put_xiph_codecpriv(s, dyn_cp, codec);
496 else if (codec->codec_id == AV_CODEC_ID_FLAC)
497 ret = ff_flac_write_header(dyn_cp, codec, 1);
498 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
499 ret = put_wv_codecpriv(dyn_cp, codec);
500 else if (codec->codec_id == AV_CODEC_ID_H264)
501 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
502 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
503 if (codec->extradata_size < 36) {
504 av_log(s, AV_LOG_ERROR,
505 "Invalid extradata found, ALAC expects a 36-byte "
507 ret = AVERROR_INVALIDDATA;
509 avio_write(dyn_cp, codec->extradata + 12,
510 codec->extradata_size - 12);
512 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
513 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
514 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
516 if (!codec->codec_tag)
517 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
518 if (codec->extradata_size)
519 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
521 if (!codec->codec_tag)
522 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
523 if (!codec->codec_tag) {
524 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
525 avcodec_get_name(codec->codec_id));
526 ret = AVERROR(EINVAL);
529 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
532 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
534 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
536 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
537 avcodec_get_name(codec->codec_id));
538 ret = AVERROR(EINVAL);
540 if (!codec->codec_tag)
541 codec->codec_tag = tag;
543 ff_put_wav_header(dyn_cp, codec);
546 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
548 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
553 static int mkv_write_tracks(AVFormatContext *s)
555 MatroskaMuxContext *mkv = s->priv_data;
556 AVIOContext *pb = s->pb;
558 int i, j, ret, default_stream_exists = 0;
560 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
561 if (ret < 0) return ret;
563 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
564 for (i = 0; i < s->nb_streams; i++) {
565 AVStream *st = s->streams[i];
566 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
568 for (i = 0; i < s->nb_streams; i++) {
569 AVStream *st = s->streams[i];
570 AVCodecContext *codec = st->codec;
571 ebml_master subinfo, track;
574 int bit_depth = av_get_bits_per_sample(codec->codec_id);
575 int sample_rate = codec->sample_rate;
576 int output_sample_rate = 0;
577 AVDictionaryEntry *tag;
579 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
580 mkv->have_attachments = 1;
585 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
587 bit_depth = codec->bits_per_coded_sample;
589 if (codec->codec_id == AV_CODEC_ID_AAC)
590 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
592 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
593 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
594 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
595 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
597 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
598 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
599 tag = av_dict_get(st->metadata, "language", NULL, 0);
600 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
601 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
602 } else if (tag && tag->value) {
603 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
606 if (default_stream_exists) {
607 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
609 if (st->disposition & AV_DISPOSITION_FORCED)
610 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
612 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
613 const char *codec_id;
614 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
615 codec_id = "D_WEBVTT/CAPTIONS";
616 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
617 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
618 codec_id = "D_WEBVTT/DESCRIPTIONS";
619 native_id = MATROSKA_TRACK_TYPE_METADATA;
620 } else if (st->disposition & AV_DISPOSITION_METADATA) {
621 codec_id = "D_WEBVTT/METADATA";
622 native_id = MATROSKA_TRACK_TYPE_METADATA;
624 codec_id = "D_WEBVTT/SUBTITLES";
625 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
627 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
629 // look for a codec ID string specific to mkv to use,
630 // if none are found, use AVI codes
631 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
632 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
633 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
640 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
641 codec->codec_id == AV_CODEC_ID_VP9 ||
642 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
643 codec->codec_id == AV_CODEC_ID_VORBIS ||
644 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
645 av_log(s, AV_LOG_ERROR,
646 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
647 return AVERROR(EINVAL);
650 switch (codec->codec_type) {
651 case AVMEDIA_TYPE_VIDEO:
652 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
653 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
654 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
656 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
659 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
660 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
661 || codec->codec_id == AV_CODEC_ID_SVQ1
662 || codec->codec_id == AV_CODEC_ID_SVQ3
663 || codec->codec_id == AV_CODEC_ID_CINEPAK))
667 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
668 else if (!native_id) {
669 // if there is no mkv-specific codec ID, use VFW mode
670 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
671 mkv->tracks[i].write_dts = 1;
674 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
675 // XXX: interlace flag?
676 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
677 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
679 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
680 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
681 // save stereo mode flag
682 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
684 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
685 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
690 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
691 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
692 av_log(s, AV_LOG_ERROR,
693 "The specified stereo mode is not valid.\n");
694 return AVERROR(EINVAL);
696 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
699 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
700 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
701 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
702 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
705 if (st->sample_aspect_ratio.num) {
706 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
707 if (d_width > INT_MAX) {
708 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
709 return AVERROR(EINVAL);
711 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
712 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
715 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
716 uint32_t color_space = av_le2ne32(codec->codec_tag);
717 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
719 end_ebml_master(pb, subinfo);
722 case AVMEDIA_TYPE_AUDIO:
723 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
726 // no mkv-specific ID, use ACM mode
727 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
729 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
730 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
731 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
732 if (output_sample_rate)
733 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
735 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
736 end_ebml_master(pb, subinfo);
739 case AVMEDIA_TYPE_SUBTITLE:
741 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
742 return AVERROR(ENOSYS);
745 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
746 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
748 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
751 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
752 return AVERROR(EINVAL);
755 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
756 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
757 if (ret < 0) return ret;
760 end_ebml_master(pb, track);
762 // ms precision is the de-facto standard timescale for mkv files
763 avpriv_set_pts_info(st, 64, 1, 1000);
765 end_ebml_master(pb, tracks);
769 static int mkv_write_chapters(AVFormatContext *s)
771 MatroskaMuxContext *mkv = s->priv_data;
772 AVIOContext *pb = s->pb;
773 ebml_master chapters, editionentry;
774 AVRational scale = {1, 1E9};
780 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
781 if (ret < 0) return ret;
783 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
784 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
785 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
786 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
787 for (i = 0; i < s->nb_chapters; i++) {
788 ebml_master chapteratom, chapterdisplay;
789 AVChapter *c = s->chapters[i];
790 AVDictionaryEntry *t = NULL;
792 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
793 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
794 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
795 av_rescale_q(c->start, c->time_base, scale));
796 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
797 av_rescale_q(c->end, c->time_base, scale));
798 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
799 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
800 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
801 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
802 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
803 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
804 end_ebml_master(pb, chapterdisplay);
806 end_ebml_master(pb, chapteratom);
808 end_ebml_master(pb, editionentry);
809 end_ebml_master(pb, chapters);
813 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
815 uint8_t *key = av_strdup(t->key);
817 const uint8_t *lang = NULL;
820 if ((p = strrchr(p, '-')) &&
821 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
828 else if (*p >= 'a' && *p <= 'z')
833 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
834 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
836 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
837 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
838 end_ebml_master(pb, tag);
843 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
844 unsigned int uid, ebml_master *tags)
846 MatroskaMuxContext *mkv = s->priv_data;
847 ebml_master tag, targets;
848 AVDictionaryEntry *t = NULL;
852 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
853 if (ret < 0) return ret;
855 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
858 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
859 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
861 put_ebml_uint(s->pb, elementid, uid);
862 end_ebml_master(s->pb, targets);
864 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
865 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
866 mkv_write_simpletag(s->pb, t);
868 end_ebml_master(s->pb, tag);
872 static int mkv_write_tags(AVFormatContext *s)
874 ebml_master tags = {0};
877 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
879 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
880 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
881 if (ret < 0) return ret;
884 for (i = 0; i < s->nb_streams; i++) {
885 AVStream *st = s->streams[i];
887 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
890 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
891 if (ret < 0) return ret;
894 for (i = 0; i < s->nb_chapters; i++) {
895 AVChapter *ch = s->chapters[i];
897 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
900 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
901 if (ret < 0) return ret;
905 end_ebml_master(s->pb, tags);
909 static int mkv_write_attachments(AVFormatContext *s)
911 MatroskaMuxContext *mkv = s->priv_data;
912 AVIOContext *pb = s->pb;
913 ebml_master attachments;
917 if (!mkv->have_attachments)
920 av_lfg_init(&c, av_get_random_seed());
922 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
923 if (ret < 0) return ret;
925 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
927 for (i = 0; i < s->nb_streams; i++) {
928 AVStream *st = s->streams[i];
929 ebml_master attached_file;
930 AVDictionaryEntry *t;
931 const char *mimetype = NULL;
934 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
937 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
939 if (t = av_dict_get(st->metadata, "title", NULL, 0))
940 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
941 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
942 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
943 return AVERROR(EINVAL);
945 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
946 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
948 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
950 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
951 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
952 mimetype = ff_mkv_mime_tags[i].str;
957 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
958 "it cannot be deduced from the codec id.\n", i);
959 return AVERROR(EINVAL);
962 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
963 struct AVSHA *sha = av_sha_alloc();
966 return AVERROR(ENOMEM);
967 av_sha_init(sha, 160);
968 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
969 av_sha_final(sha, digest);
971 fileuid = AV_RL64(digest);
973 fileuid = av_lfg_get(&c);
975 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
978 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
979 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
980 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
981 end_ebml_master(pb, attached_file);
983 end_ebml_master(pb, attachments);
988 static int mkv_write_header(AVFormatContext *s)
990 MatroskaMuxContext *mkv = s->priv_data;
991 AVIOContext *pb = s->pb;
992 ebml_master ebml_header, segment_info;
993 AVDictionaryEntry *tag;
996 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
997 else mkv->mode = MODE_MATROSKAv2;
999 if (s->avoid_negative_ts < 0)
1000 s->avoid_negative_ts = 1;
1002 for (i = 0; i < s->nb_streams; i++)
1003 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1004 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1005 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1006 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1007 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1008 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1009 av_log(s, AV_LOG_ERROR,
1010 "The Matroska muxer does not yet support muxing %s\n",
1011 avcodec_get_name(s->streams[i]->codec->codec_id));
1012 return AVERROR_PATCHWELCOME;
1015 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1017 return AVERROR(ENOMEM);
1019 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1020 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1021 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1022 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1023 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1024 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1025 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
1026 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1027 end_ebml_master(pb, ebml_header);
1029 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1030 mkv->segment_offset = avio_tell(pb);
1032 // we write 2 seek heads - one at the end of the file to point to each
1033 // cluster, and one at the beginning to point to all other level one
1034 // elements (including the seek head at the end of the file), which
1035 // isn't more than 10 elements if we only write one of each other
1036 // currently defined level 1 element
1037 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1038 if (!mkv->main_seekhead)
1039 return AVERROR(ENOMEM);
1041 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1042 if (ret < 0) return ret;
1044 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1045 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1046 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1047 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1048 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1049 uint32_t segment_uid[4];
1052 av_lfg_init(&lfg, av_get_random_seed());
1054 for (i = 0; i < 4; i++)
1055 segment_uid[i] = av_lfg_get(&lfg);
1057 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1058 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1059 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1062 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1063 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1064 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1065 uint8_t date_utc_buf[8];
1066 AV_WB64(date_utc_buf, date_utc);
1067 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1070 // reserve space for the duration
1072 mkv->duration_offset = avio_tell(pb);
1073 put_ebml_void(pb, 11); // assumes double-precision float to be written
1074 end_ebml_master(pb, segment_info);
1076 ret = mkv_write_tracks(s);
1077 if (ret < 0) return ret;
1079 if (mkv->mode != MODE_WEBM) {
1080 ret = mkv_write_chapters(s);
1081 if (ret < 0) return ret;
1083 ret = mkv_write_tags(s);
1084 if (ret < 0) return ret;
1086 ret = mkv_write_attachments(s);
1087 if (ret < 0) return ret;
1090 if (!s->pb->seekable)
1091 mkv_write_seekhead(pb, mkv->main_seekhead);
1093 mkv->cues = mkv_start_cues(mkv->segment_offset);
1094 if (mkv->cues == NULL)
1095 return AVERROR(ENOMEM);
1097 if (pb->seekable && mkv->reserve_cues_space) {
1098 mkv->cues_pos = avio_tell(pb);
1099 put_ebml_void(pb, mkv->reserve_cues_space);
1102 av_init_packet(&mkv->cur_audio_pkt);
1103 mkv->cur_audio_pkt.size = 0;
1104 mkv->cluster_pos = -1;
1110 static int mkv_blockgroup_size(int pkt_size)
1112 int size = pkt_size + 4;
1113 size += ebml_num_size(size);
1114 size += 2; // EBML ID for block and block duration
1115 size += 8; // max size of block duration
1116 size += ebml_num_size(size);
1117 size += 1; // blockgroup EBML ID
1121 static int ass_get_duration(const uint8_t *p)
1123 int sh, sm, ss, sc, eh, em, es, ec;
1124 uint64_t start, end;
1126 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1127 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1129 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1130 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1135 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1137 MatroskaMuxContext *mkv = s->priv_data;
1138 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1139 uint8_t *start, *end, *data = pkt->data;
1140 ebml_master blockgroup;
1144 int duration = ass_get_duration(data);
1145 max_duration = FFMAX(duration, max_duration);
1146 end = memchr(data, '\n', data_size);
1147 size = line_size = end ? end-data+1 : data_size;
1148 size -= end ? (end[-1]=='\r')+1 : 0;
1150 for (i=0; i<3; i++, start++)
1151 if (!(start = memchr(start, ',', size-(start-data))))
1152 return max_duration;
1153 size -= start - data;
1154 sscanf(data, "Dialogue: %d,", &layer);
1155 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1156 s->streams[pkt->stream_index]->nb_frames, layer);
1157 size = FFMIN(i+size, sizeof(buffer));
1158 memcpy(buffer+i, start, size-i);
1160 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1161 "pts %" PRId64 ", duration %d\n",
1162 avio_tell(pb), size, pkt->pts, duration);
1163 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1164 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1165 put_ebml_num(pb, size+4, 0);
1166 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1167 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1169 avio_write(pb, buffer, size);
1170 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1171 end_ebml_master(pb, blockgroup);
1174 data_size -= line_size;
1177 return max_duration;
1181 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1188 dst = av_malloc(srclen);
1190 return AVERROR(ENOMEM);
1192 while (srclen >= WV_HEADER_SIZE) {
1195 ret = ff_wv_parse_header(&header, src);
1198 src += WV_HEADER_SIZE;
1199 srclen -= WV_HEADER_SIZE;
1201 if (srclen < header.blocksize) {
1202 ret = AVERROR_INVALIDDATA;
1206 if (header.initial) {
1207 AV_WL32(dst + offset, header.samples);
1210 AV_WL32(dst + offset, header.flags);
1211 AV_WL32(dst + offset + 4, header.crc);
1214 if (!(header.initial && header.final)) {
1215 AV_WL32(dst + offset, header.blocksize);
1219 memcpy(dst + offset, src, header.blocksize);
1220 src += header.blocksize;
1221 srclen -= header.blocksize;
1222 offset += header.blocksize;
1234 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1235 unsigned int blockid, AVPacket *pkt, int flags)
1237 MatroskaMuxContext *mkv = s->priv_data;
1238 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1239 uint8_t *data = NULL, *side_data = NULL;
1240 int offset = 0, size = pkt->size, side_data_size = 0;
1241 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1242 uint64_t additional_id = 0;
1243 ebml_master block_group, block_additions, block_more;
1245 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1246 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1247 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1248 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1249 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1250 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1251 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1252 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1254 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1260 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1261 /* Matroska specification requires to remove the first QuickTime atom
1267 side_data = av_packet_get_side_data(pkt,
1268 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1271 additional_id = AV_RB64(side_data);
1273 side_data_size -= 8;
1276 if (side_data_size && additional_id == 1) {
1277 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1278 blockid = MATROSKA_ID_BLOCK;
1281 put_ebml_id(pb, blockid);
1282 put_ebml_num(pb, size+4, 0);
1283 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1284 avio_wb16(pb, ts - mkv->cluster_pts);
1286 avio_write(pb, data + offset, size);
1287 if (data != pkt->data)
1290 if (side_data_size && additional_id == 1) {
1291 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1292 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1293 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1294 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1295 put_ebml_num(pb, side_data_size, 0);
1296 avio_write(pb, side_data, side_data_size);
1297 end_ebml_master(pb, block_more);
1298 end_ebml_master(pb, block_additions);
1299 end_ebml_master(pb, block_group);
1303 static int srt_get_duration(uint8_t **buf)
1305 int i, duration = 0;
1307 for (i=0; i<2 && !duration; i++) {
1308 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1309 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1310 &s_hour, &s_min, &s_sec, &s_hsec,
1311 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1312 s_min += 60*s_hour; e_min += 60*e_hour;
1313 s_sec += 60*s_min; e_sec += 60*e_min;
1314 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1315 duration = e_hsec - s_hsec;
1317 *buf += strcspn(*buf, "\n") + 1;
1322 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1324 ebml_master blockgroup;
1325 AVPacket pkt2 = *pkt;
1326 int64_t duration = srt_get_duration(&pkt2.data);
1327 pkt2.size -= pkt2.data - pkt->data;
1329 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1330 mkv_blockgroup_size(pkt2.size));
1331 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1332 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1333 end_ebml_master(pb, blockgroup);
1338 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1340 MatroskaMuxContext *mkv = s->priv_data;
1341 ebml_master blockgroup;
1342 int id_size, settings_size, size;
1343 uint8_t *id, *settings;
1344 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1345 const int flags = 0;
1348 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1352 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1355 size = id_size + 1 + settings_size + 1 + pkt->size;
1357 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1358 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1359 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1361 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1363 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1364 put_ebml_num(pb, size+4, 0);
1365 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1366 avio_wb16(pb, ts - mkv->cluster_pts);
1368 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1370 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1371 end_ebml_master(pb, blockgroup);
1373 return pkt->duration;
1376 static void mkv_flush_dynbuf(AVFormatContext *s)
1378 MatroskaMuxContext *mkv = s->priv_data;
1385 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1386 avio_write(s->pb, dyn_buf, bufsize);
1391 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1393 MatroskaMuxContext *mkv = s->priv_data;
1394 AVIOContext *pb = s->pb;
1395 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1396 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1397 int duration = pkt->duration;
1399 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1401 if (ts == AV_NOPTS_VALUE) {
1402 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1403 return AVERROR(EINVAL);
1406 if (!s->pb->seekable) {
1408 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1409 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1416 if (mkv->cluster_pos == -1) {
1417 mkv->cluster_pos = avio_tell(s->pb);
1418 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1419 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1420 mkv->cluster_pts = FFMAX(0, ts);
1423 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1424 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1426 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1427 duration = mkv_write_ass_blocks(s, pb, pkt);
1429 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1430 duration = mkv_write_srt_blocks(s, pb, pkt);
1431 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1432 duration = mkv_write_vtt_blocks(s, pb, pkt);
1434 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1435 /* For backward compatibility, prefer convergence_duration. */
1436 if (pkt->convergence_duration > 0) {
1437 duration = pkt->convergence_duration;
1439 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1440 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1441 end_ebml_master(pb, blockgroup);
1444 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1445 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1446 if (ret < 0) return ret;
1449 mkv->duration = FFMAX(mkv->duration, ts + duration);
1453 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1455 MatroskaMuxContext *mkv = s->priv_data;
1456 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1457 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1458 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1459 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1460 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1462 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1463 // after 4k and on a keyframe
1464 if (mkv->cluster_pos != -1 &&
1465 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1466 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1467 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1468 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1469 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1470 end_ebml_master(pb, mkv->cluster);
1471 mkv->cluster_pos = -1;
1473 mkv_flush_dynbuf(s);
1476 // check if we have an audio packet cached
1477 if (mkv->cur_audio_pkt.size > 0) {
1478 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1479 av_free_packet(&mkv->cur_audio_pkt);
1481 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1486 // buffer an audio packet to ensure the packet containing the video
1487 // keyframe's timecode is contained in the same cluster for WebM
1488 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1489 mkv->cur_audio_pkt = *pkt;
1491 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1492 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1494 ret = av_dup_packet(&mkv->cur_audio_pkt);
1496 ret = mkv_write_packet_internal(s, pkt);
1500 static int mkv_write_trailer(AVFormatContext *s)
1502 MatroskaMuxContext *mkv = s->priv_data;
1503 AVIOContext *pb = s->pb;
1504 int64_t currentpos, cuespos;
1507 // check if we have an audio packet cached
1508 if (mkv->cur_audio_pkt.size > 0) {
1509 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1510 av_free_packet(&mkv->cur_audio_pkt);
1512 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1518 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1519 mkv_flush_dynbuf(s);
1520 } else if (mkv->cluster_pos != -1) {
1521 end_ebml_master(pb, mkv->cluster);
1525 if (mkv->cues->num_entries) {
1526 if (mkv->reserve_cues_space) {
1529 currentpos = avio_tell(pb);
1530 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1532 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1533 cues_end = avio_tell(pb);
1534 if (cues_end > cuespos + mkv->reserve_cues_space) {
1535 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1536 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1537 cues_end - cuespos);
1538 return AVERROR(EINVAL);
1541 if (cues_end < cuespos + mkv->reserve_cues_space)
1542 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1544 avio_seek(pb, currentpos, SEEK_SET);
1546 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1549 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1550 if (ret < 0) return ret;
1553 mkv_write_seekhead(pb, mkv->main_seekhead);
1555 // update the duration
1556 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1557 currentpos = avio_tell(pb);
1558 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1559 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1561 avio_seek(pb, currentpos, SEEK_SET);
1564 end_ebml_master(pb, mkv->segment);
1565 av_free(mkv->tracks);
1566 av_freep(&mkv->cues->entries);
1567 av_freep(&mkv->cues);
1572 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1575 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1576 if (ff_mkv_codec_tags[i].id == codec_id)
1579 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1580 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1581 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1588 const AVCodecTag additional_audio_tags[] = {
1589 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1590 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1591 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1592 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1593 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1594 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1595 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1596 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1597 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1598 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1599 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1600 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1601 { AV_CODEC_ID_WAVPACK, 0xFFFFFFFF },
1602 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1605 const AVCodecTag additional_video_tags[] = {
1606 { AV_CODEC_ID_PRORES, 0xFFFFFFFF },
1607 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1608 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1609 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1610 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1611 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1612 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1615 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1616 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1617 static const AVOption options[] = {
1618 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning "
1619 "of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1623 #if CONFIG_MATROSKA_MUXER
1624 static const AVClass matroska_class = {
1625 .class_name = "matroska muxer",
1626 .item_name = av_default_item_name,
1628 .version = LIBAVUTIL_VERSION_INT,
1631 AVOutputFormat ff_matroska_muxer = {
1633 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1634 .mime_type = "video/x-matroska",
1635 .extensions = "mkv",
1636 .priv_data_size = sizeof(MatroskaMuxContext),
1637 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1638 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1639 .video_codec = CONFIG_LIBX264_ENCODER ?
1640 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1641 .write_header = mkv_write_header,
1642 .write_packet = mkv_write_packet,
1643 .write_trailer = mkv_write_trailer,
1644 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1646 .codec_tag = (const AVCodecTag* const []){
1647 ff_codec_bmp_tags, ff_codec_wav_tags,
1648 additional_audio_tags, additional_video_tags, 0
1651 .subtitle_codec = AV_CODEC_ID_SSA,
1653 .subtitle_codec = AV_CODEC_ID_ASS,
1655 .query_codec = mkv_query_codec,
1656 .priv_class = &matroska_class,
1660 #if CONFIG_WEBM_MUXER
1661 static const AVClass webm_class = {
1662 .class_name = "webm muxer",
1663 .item_name = av_default_item_name,
1665 .version = LIBAVUTIL_VERSION_INT,
1668 AVOutputFormat ff_webm_muxer = {
1670 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1671 .mime_type = "video/webm",
1672 .extensions = "webm",
1673 .priv_data_size = sizeof(MatroskaMuxContext),
1674 .audio_codec = AV_CODEC_ID_VORBIS,
1675 .video_codec = AV_CODEC_ID_VP8,
1676 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1677 .write_header = mkv_write_header,
1678 .write_packet = mkv_write_packet,
1679 .write_trailer = mkv_write_trailer,
1680 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1682 .priv_class = &webm_class,
1686 #if CONFIG_MATROSKA_AUDIO_MUXER
1687 static const AVClass mka_class = {
1688 .class_name = "matroska audio muxer",
1689 .item_name = av_default_item_name,
1691 .version = LIBAVUTIL_VERSION_INT,
1693 AVOutputFormat ff_matroska_audio_muxer = {
1695 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1696 .mime_type = "audio/x-matroska",
1697 .extensions = "mka",
1698 .priv_data_size = sizeof(MatroskaMuxContext),
1699 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1700 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1701 .video_codec = AV_CODEC_ID_NONE,
1702 .write_header = mkv_write_header,
1703 .write_packet = mkv_write_packet,
1704 .write_trailer = mkv_write_trailer,
1705 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
1706 .codec_tag = (const AVCodecTag* const []){
1707 ff_codec_wav_tags, additional_audio_tags, 0
1709 .priv_class = &mka_class,