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 "avlanguage.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/intfloat.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/lfg.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/random_seed.h"
40 #include "libavutil/samplefmt.h"
41 #include "libavutil/sha.h"
43 #include "libavcodec/xiph.h"
44 #include "libavcodec/mpeg4audio.h"
46 typedef struct ebml_master {
47 int64_t pos; ///< absolute offset in the file where the master's elements start
48 int sizebytes; ///< how many bytes were reserved for the size
51 typedef struct mkv_seekhead_entry {
52 unsigned int elementid;
56 typedef struct mkv_seekhead {
58 int64_t segment_offset; ///< the file offset to the beginning of the segment
59 int reserved_size; ///< -1 if appending to file
61 mkv_seekhead_entry *entries;
68 int64_t cluster_pos; ///< file offset of the cluster containing the block
72 int64_t segment_offset;
73 mkv_cuepoint *entries;
82 #define MODE_MATROSKAv2 0x01
83 #define MODE_WEBM 0x02
85 typedef struct MatroskaMuxContext {
90 int64_t segment_offset;
92 int64_t cluster_pos; ///< file offset of the current cluster
94 int64_t duration_offset;
96 mkv_seekhead *main_seekhead;
100 AVPacket cur_audio_pkt;
102 int have_attachments;
104 int reserve_cues_space;
106 } MatroskaMuxContext;
109 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
110 * offset, 4 bytes for target EBML ID */
111 #define MAX_SEEKENTRY_SIZE 21
113 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
115 #define MAX_CUETRACKPOS_SIZE 22
117 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
118 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
121 static int ebml_id_size(unsigned int id)
123 return (av_log2(id+1)-1)/7+1;
126 static void put_ebml_id(AVIOContext *pb, unsigned int id)
128 int i = ebml_id_size(id);
130 avio_w8(pb, (uint8_t)(id >> (i*8)));
134 * Write an EBML size meaning "unknown size".
136 * @param bytes The number of bytes the size should occupy (maximum: 8).
138 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
140 av_assert0(bytes <= 8);
141 avio_w8(pb, 0x1ff >> bytes);
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 while(avio_tell(pb) < currentpos + size)
237 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
239 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
240 put_ebml_id(pb, elementid);
241 put_ebml_size_unknown(pb, bytes);
242 return (ebml_master){ avio_tell(pb), bytes };
245 static void end_ebml_master(AVIOContext *pb, ebml_master master)
247 int64_t pos = avio_tell(pb);
249 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
251 put_ebml_num(pb, pos - master.pos, master.sizebytes);
252 avio_seek(pb, pos, SEEK_SET);
255 static void put_xiph_size(AVIOContext *pb, int size)
258 for (i = 0; i < size / 255; i++)
260 avio_w8(pb, size % 255);
264 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
265 * elements. If a maximum number of elements is specified, enough space
266 * will be reserved at the current file location to write a seek head of
269 * @param segment_offset The absolute offset to the position in the file
270 * where the segment begins.
271 * @param numelements The maximum number of elements that will be indexed
272 * by this seek head, 0 if unlimited.
274 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
276 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
277 if (new_seekhead == NULL)
280 new_seekhead->segment_offset = segment_offset;
282 if (numelements > 0) {
283 new_seekhead->filepos = avio_tell(pb);
284 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
285 // and size, and 3 bytes to guarantee that an EBML void element
286 // will fit afterwards
287 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
288 new_seekhead->max_entries = numelements;
289 put_ebml_void(pb, new_seekhead->reserved_size);
294 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
296 mkv_seekhead_entry *entries = seekhead->entries;
298 // don't store more elements than we reserved space for
299 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
302 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
304 return AVERROR(ENOMEM);
306 entries[seekhead->num_entries ].elementid = elementid;
307 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
309 seekhead->entries = entries;
314 * Write the seek head to the file and free it. If a maximum number of
315 * elements was specified to mkv_start_seekhead(), the seek head will
316 * be written at the location reserved for it. Otherwise, it is written
317 * at the current location in the file.
319 * @return The file offset where the seekhead was written,
320 * -1 if an error occurred.
322 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
324 ebml_master metaseek, seekentry;
328 currentpos = avio_tell(pb);
330 if (seekhead->reserved_size > 0) {
331 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
337 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
338 for (i = 0; i < seekhead->num_entries; i++) {
339 mkv_seekhead_entry *entry = &seekhead->entries[i];
341 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
343 put_ebml_id(pb, MATROSKA_ID_SEEKID);
344 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
345 put_ebml_id(pb, entry->elementid);
347 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
348 end_ebml_master(pb, seekentry);
350 end_ebml_master(pb, metaseek);
352 if (seekhead->reserved_size > 0) {
353 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
354 put_ebml_void(pb, remaining);
355 avio_seek(pb, currentpos, SEEK_SET);
357 currentpos = seekhead->filepos;
360 av_free(seekhead->entries);
366 static mkv_cues * mkv_start_cues(int64_t segment_offset)
368 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
372 cues->segment_offset = segment_offset;
376 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
378 mkv_cuepoint *entries = cues->entries;
383 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
385 return AVERROR(ENOMEM);
387 entries[cues->num_entries ].pts = ts;
388 entries[cues->num_entries ].tracknum = stream + 1;
389 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
391 cues->entries = entries;
395 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
397 ebml_master cues_element;
401 currentpos = avio_tell(pb);
402 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
404 for (i = 0; i < cues->num_entries; i++) {
405 ebml_master cuepoint, track_positions;
406 mkv_cuepoint *entry = &cues->entries[i];
407 uint64_t pts = entry->pts;
409 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
410 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
412 // put all the entries from different tracks that have the exact same
413 // timestamp into the same CuePoint
414 for (j = 0; j < num_tracks; j++)
415 tracks[j].has_cue = 0;
416 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
417 int tracknum = entry[j].tracknum - 1;
418 av_assert0(tracknum>=0 && tracknum<num_tracks);
419 if (tracks[tracknum].has_cue)
421 tracks[tracknum].has_cue = 1;
422 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
423 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
424 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
425 end_ebml_master(pb, track_positions);
428 end_ebml_master(pb, cuepoint);
430 end_ebml_master(pb, cues_element);
435 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
437 uint8_t *header_start[3];
439 int first_header_size;
442 if (codec->codec_id == AV_CODEC_ID_VORBIS)
443 first_header_size = 30;
445 first_header_size = 42;
447 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
448 first_header_size, header_start, header_len) < 0) {
449 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
453 avio_w8(pb, 2); // number packets - 1
454 for (j = 0; j < 2; j++) {
455 put_xiph_size(pb, header_len[j]);
457 for (j = 0; j < 3; j++)
458 avio_write(pb, header_start[j], header_len[j]);
463 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
465 if (codec->extradata && codec->extradata_size == 2)
466 avio_write(pb, codec->extradata, 2);
468 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
472 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
474 MPEG4AudioConfig mp4ac;
476 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
477 codec->extradata_size * 8, 1) < 0) {
478 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
482 *sample_rate = mp4ac.sample_rate;
483 *output_sample_rate = mp4ac.ext_sample_rate;
486 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
490 int ret, codecpriv_size;
492 ret = avio_open_dyn_buf(&dyn_cp);
497 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
498 ret = put_xiph_codecpriv(s, dyn_cp, codec);
499 else if (codec->codec_id == AV_CODEC_ID_FLAC)
500 ret = ff_flac_write_header(dyn_cp, codec, 1);
501 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
502 ret = put_wv_codecpriv(dyn_cp, codec);
503 else if (codec->codec_id == AV_CODEC_ID_H264)
504 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
505 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
506 if (codec->extradata_size < 36) {
507 av_log(s, AV_LOG_ERROR,
508 "Invalid extradata found, ALAC expects a 36-byte "
510 ret = AVERROR_INVALIDDATA;
512 avio_write(dyn_cp, codec->extradata + 12,
513 codec->extradata_size - 12);
515 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
516 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
517 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
519 if (!codec->codec_tag)
520 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
521 if (codec->extradata_size)
522 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
524 if (!codec->codec_tag)
525 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
526 if (!codec->codec_tag) {
527 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
528 avcodec_get_name(codec->codec_id));
529 ret = AVERROR(EINVAL);
532 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
535 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
537 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
539 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
540 avcodec_get_name(codec->codec_id));
541 ret = AVERROR(EINVAL);
543 if (!codec->codec_tag)
544 codec->codec_tag = tag;
546 ff_put_wav_header(dyn_cp, codec);
549 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
551 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
556 static int mkv_write_tracks(AVFormatContext *s)
558 MatroskaMuxContext *mkv = s->priv_data;
559 AVIOContext *pb = s->pb;
561 int i, j, ret, default_stream_exists = 0;
563 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
564 if (ret < 0) return ret;
566 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
567 for (i = 0; i < s->nb_streams; i++) {
568 AVStream *st = s->streams[i];
569 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
571 for (i = 0; i < s->nb_streams; i++) {
572 AVStream *st = s->streams[i];
573 AVCodecContext *codec = st->codec;
574 ebml_master subinfo, track;
577 int bit_depth = av_get_bits_per_sample(codec->codec_id);
578 int sample_rate = codec->sample_rate;
579 int output_sample_rate = 0;
580 AVDictionaryEntry *tag;
582 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
583 mkv->have_attachments = 1;
588 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
590 bit_depth = codec->bits_per_coded_sample;
592 if (codec->codec_id == AV_CODEC_ID_AAC)
593 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
595 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
596 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
597 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
598 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
600 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
601 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
602 tag = av_dict_get(st->metadata, "language", NULL, 0);
603 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
604 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
605 } else if (tag && tag->value) {
606 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
609 if (default_stream_exists) {
610 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
612 if (st->disposition & AV_DISPOSITION_FORCED)
613 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
615 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
616 const char *codec_id;
617 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
618 codec_id = "D_WEBVTT/CAPTIONS";
619 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
620 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
621 codec_id = "D_WEBVTT/DESCRIPTIONS";
622 native_id = MATROSKA_TRACK_TYPE_METADATA;
623 } else if (st->disposition & AV_DISPOSITION_METADATA) {
624 codec_id = "D_WEBVTT/METADATA";
625 native_id = MATROSKA_TRACK_TYPE_METADATA;
627 codec_id = "D_WEBVTT/SUBTITLES";
628 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
630 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
632 // look for a codec ID string specific to mkv to use,
633 // if none are found, use AVI codes
634 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
635 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
636 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
643 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
644 codec->codec_id == AV_CODEC_ID_VP9 ||
645 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
646 codec->codec_id == AV_CODEC_ID_VORBIS ||
647 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
648 av_log(s, AV_LOG_ERROR,
649 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
650 return AVERROR(EINVAL);
653 switch (codec->codec_type) {
654 case AVMEDIA_TYPE_VIDEO:
655 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
656 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
657 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
659 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
662 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
663 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
664 || codec->codec_id == AV_CODEC_ID_SVQ1
665 || codec->codec_id == AV_CODEC_ID_SVQ3
666 || codec->codec_id == AV_CODEC_ID_CINEPAK))
670 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
671 else if (!native_id) {
672 // if there is no mkv-specific codec ID, use VFW mode
673 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
674 mkv->tracks[i].write_dts = 1;
677 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
678 // XXX: interlace flag?
679 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
680 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
682 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
683 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
684 // save stereo mode flag
685 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
687 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
688 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
693 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
694 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
695 av_log(s, AV_LOG_ERROR,
696 "The specified stereo mode is not valid.\n");
697 return AVERROR(EINVAL);
699 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
702 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
703 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
704 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
705 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
708 if (st->sample_aspect_ratio.num) {
709 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
710 if (d_width > INT_MAX) {
711 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
712 return AVERROR(EINVAL);
714 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
715 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
718 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
719 uint32_t color_space = av_le2ne32(codec->codec_tag);
720 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
722 end_ebml_master(pb, subinfo);
725 case AVMEDIA_TYPE_AUDIO:
726 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
729 // no mkv-specific ID, use ACM mode
730 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
732 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
733 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
734 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
735 if (output_sample_rate)
736 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
738 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
739 end_ebml_master(pb, subinfo);
742 case AVMEDIA_TYPE_SUBTITLE:
744 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
745 return AVERROR(ENOSYS);
748 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
749 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
751 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
754 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
755 return AVERROR(EINVAL);
758 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
759 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
760 if (ret < 0) return ret;
763 end_ebml_master(pb, track);
765 // ms precision is the de-facto standard timescale for mkv files
766 avpriv_set_pts_info(st, 64, 1, 1000);
768 end_ebml_master(pb, tracks);
772 static int mkv_write_chapters(AVFormatContext *s)
774 MatroskaMuxContext *mkv = s->priv_data;
775 AVIOContext *pb = s->pb;
776 ebml_master chapters, editionentry;
777 AVRational scale = {1, 1E9};
783 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
784 if (ret < 0) return ret;
786 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
787 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
788 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
789 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
790 for (i = 0; i < s->nb_chapters; i++) {
791 ebml_master chapteratom, chapterdisplay;
792 AVChapter *c = s->chapters[i];
793 AVDictionaryEntry *t = NULL;
795 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
796 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
797 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
798 av_rescale_q(c->start, c->time_base, scale));
799 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
800 av_rescale_q(c->end, c->time_base, scale));
801 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
802 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
803 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
804 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
805 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
806 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
807 end_ebml_master(pb, chapterdisplay);
809 end_ebml_master(pb, chapteratom);
811 end_ebml_master(pb, editionentry);
812 end_ebml_master(pb, chapters);
816 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
818 uint8_t *key = av_strdup(t->key);
820 const uint8_t *lang = NULL;
823 if ((p = strrchr(p, '-')) &&
824 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
831 else if (*p >= 'a' && *p <= 'z')
836 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
837 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
839 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
840 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
841 end_ebml_master(pb, tag);
846 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
847 unsigned int uid, ebml_master *tags)
849 MatroskaMuxContext *mkv = s->priv_data;
850 ebml_master tag, targets;
851 AVDictionaryEntry *t = NULL;
855 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
856 if (ret < 0) return ret;
858 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
861 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
862 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
864 put_ebml_uint(s->pb, elementid, uid);
865 end_ebml_master(s->pb, targets);
867 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
868 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
869 mkv_write_simpletag(s->pb, t);
871 end_ebml_master(s->pb, tag);
875 static int mkv_write_tags(AVFormatContext *s)
877 ebml_master tags = {0};
880 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
882 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
883 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
884 if (ret < 0) return ret;
887 for (i = 0; i < s->nb_streams; i++) {
888 AVStream *st = s->streams[i];
890 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
893 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
894 if (ret < 0) return ret;
897 for (i = 0; i < s->nb_chapters; i++) {
898 AVChapter *ch = s->chapters[i];
900 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
903 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
904 if (ret < 0) return ret;
908 end_ebml_master(s->pb, tags);
912 static int mkv_write_attachments(AVFormatContext *s)
914 MatroskaMuxContext *mkv = s->priv_data;
915 AVIOContext *pb = s->pb;
916 ebml_master attachments;
920 if (!mkv->have_attachments)
923 av_lfg_init(&c, av_get_random_seed());
925 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
926 if (ret < 0) return ret;
928 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
930 for (i = 0; i < s->nb_streams; i++) {
931 AVStream *st = s->streams[i];
932 ebml_master attached_file;
933 AVDictionaryEntry *t;
934 const char *mimetype = NULL;
937 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
940 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
942 if (t = av_dict_get(st->metadata, "title", NULL, 0))
943 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
944 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
945 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
946 return AVERROR(EINVAL);
948 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
949 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
951 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
953 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
954 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
955 mimetype = ff_mkv_mime_tags[i].str;
960 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
961 "it cannot be deduced from the codec id.\n", i);
962 return AVERROR(EINVAL);
965 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
966 struct AVSHA *sha = av_sha_alloc();
969 return AVERROR(ENOMEM);
970 av_sha_init(sha, 160);
971 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
972 av_sha_final(sha, digest);
974 fileuid = AV_RL64(digest);
976 fileuid = av_lfg_get(&c);
978 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
981 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
982 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
983 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
984 end_ebml_master(pb, attached_file);
986 end_ebml_master(pb, attachments);
991 static int mkv_write_header(AVFormatContext *s)
993 MatroskaMuxContext *mkv = s->priv_data;
994 AVIOContext *pb = s->pb;
995 ebml_master ebml_header, segment_info;
996 AVDictionaryEntry *tag;
999 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1000 else mkv->mode = MODE_MATROSKAv2;
1002 if (s->avoid_negative_ts < 0)
1003 s->avoid_negative_ts = 1;
1005 for (i = 0; i < s->nb_streams; i++)
1006 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1007 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1008 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1009 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1010 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1011 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1012 av_log(s, AV_LOG_ERROR,
1013 "The Matroska muxer does not yet support muxing %s\n",
1014 avcodec_get_name(s->streams[i]->codec->codec_id));
1015 return AVERROR_PATCHWELCOME;
1018 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1020 return AVERROR(ENOMEM);
1022 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1023 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1024 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1025 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1026 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1027 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1028 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
1029 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1030 end_ebml_master(pb, ebml_header);
1032 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1033 mkv->segment_offset = avio_tell(pb);
1035 // we write 2 seek heads - one at the end of the file to point to each
1036 // cluster, and one at the beginning to point to all other level one
1037 // elements (including the seek head at the end of the file), which
1038 // isn't more than 10 elements if we only write one of each other
1039 // currently defined level 1 element
1040 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1041 if (!mkv->main_seekhead)
1042 return AVERROR(ENOMEM);
1044 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1045 if (ret < 0) return ret;
1047 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1048 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1049 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1050 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1051 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1052 uint32_t segment_uid[4];
1055 av_lfg_init(&lfg, av_get_random_seed());
1057 for (i = 0; i < 4; i++)
1058 segment_uid[i] = av_lfg_get(&lfg);
1060 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1061 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1062 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1065 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1066 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1067 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1068 uint8_t date_utc_buf[8];
1069 AV_WB64(date_utc_buf, date_utc);
1070 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1073 // reserve space for the duration
1075 mkv->duration_offset = avio_tell(pb);
1076 put_ebml_void(pb, 11); // assumes double-precision float to be written
1077 end_ebml_master(pb, segment_info);
1079 ret = mkv_write_tracks(s);
1080 if (ret < 0) return ret;
1082 if (mkv->mode != MODE_WEBM) {
1083 ret = mkv_write_chapters(s);
1084 if (ret < 0) return ret;
1086 ret = mkv_write_tags(s);
1087 if (ret < 0) return ret;
1089 ret = mkv_write_attachments(s);
1090 if (ret < 0) return ret;
1093 if (!s->pb->seekable)
1094 mkv_write_seekhead(pb, mkv->main_seekhead);
1096 mkv->cues = mkv_start_cues(mkv->segment_offset);
1097 if (mkv->cues == NULL)
1098 return AVERROR(ENOMEM);
1100 if (pb->seekable && mkv->reserve_cues_space) {
1101 mkv->cues_pos = avio_tell(pb);
1102 put_ebml_void(pb, mkv->reserve_cues_space);
1105 av_init_packet(&mkv->cur_audio_pkt);
1106 mkv->cur_audio_pkt.size = 0;
1107 mkv->cluster_pos = -1;
1113 static int mkv_blockgroup_size(int pkt_size)
1115 int size = pkt_size + 4;
1116 size += ebml_num_size(size);
1117 size += 2; // EBML ID for block and block duration
1118 size += 8; // max size of block duration
1119 size += ebml_num_size(size);
1120 size += 1; // blockgroup EBML ID
1124 static int ass_get_duration(const uint8_t *p)
1126 int sh, sm, ss, sc, eh, em, es, ec;
1127 uint64_t start, end;
1129 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1130 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1132 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1133 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1138 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1140 MatroskaMuxContext *mkv = s->priv_data;
1141 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1142 uint8_t *start, *end, *data = pkt->data;
1143 ebml_master blockgroup;
1147 int duration = ass_get_duration(data);
1148 max_duration = FFMAX(duration, max_duration);
1149 end = memchr(data, '\n', data_size);
1150 size = line_size = end ? end-data+1 : data_size;
1151 size -= end ? (end[-1]=='\r')+1 : 0;
1153 for (i=0; i<3; i++, start++)
1154 if (!(start = memchr(start, ',', size-(start-data))))
1155 return max_duration;
1156 size -= start - data;
1157 sscanf(data, "Dialogue: %d,", &layer);
1158 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1159 s->streams[pkt->stream_index]->nb_frames, layer);
1160 size = FFMIN(i+size, sizeof(buffer));
1161 memcpy(buffer+i, start, size-i);
1163 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1164 "pts %" PRId64 ", duration %d\n",
1165 avio_tell(pb), size, pkt->pts, duration);
1166 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1167 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1168 put_ebml_num(pb, size+4, 0);
1169 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1170 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1172 avio_write(pb, buffer, size);
1173 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1174 end_ebml_master(pb, blockgroup);
1177 data_size -= line_size;
1180 return max_duration;
1184 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1191 dst = av_malloc(srclen);
1193 return AVERROR(ENOMEM);
1195 while (srclen >= WV_HEADER_SIZE) {
1198 ret = ff_wv_parse_header(&header, src);
1201 src += WV_HEADER_SIZE;
1202 srclen -= WV_HEADER_SIZE;
1204 if (srclen < header.blocksize) {
1205 ret = AVERROR_INVALIDDATA;
1209 if (header.initial) {
1210 AV_WL32(dst + offset, header.samples);
1213 AV_WL32(dst + offset, header.flags);
1214 AV_WL32(dst + offset + 4, header.crc);
1217 if (!(header.initial && header.final)) {
1218 AV_WL32(dst + offset, header.blocksize);
1222 memcpy(dst + offset, src, header.blocksize);
1223 src += header.blocksize;
1224 srclen -= header.blocksize;
1225 offset += header.blocksize;
1237 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1238 unsigned int blockid, AVPacket *pkt, int flags)
1240 MatroskaMuxContext *mkv = s->priv_data;
1241 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1242 uint8_t *data = NULL, *side_data = NULL;
1243 int offset = 0, size = pkt->size, side_data_size = 0;
1244 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1245 uint64_t additional_id = 0;
1246 ebml_master block_group, block_additions, block_more;
1248 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1249 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1250 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1251 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1252 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1253 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1254 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1255 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1257 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1263 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1264 /* Matroska specification requires to remove the first QuickTime atom
1270 side_data = av_packet_get_side_data(pkt,
1271 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1274 additional_id = AV_RB64(side_data);
1276 side_data_size -= 8;
1279 if (side_data_size && additional_id == 1) {
1280 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1281 blockid = MATROSKA_ID_BLOCK;
1284 put_ebml_id(pb, blockid);
1285 put_ebml_num(pb, size+4, 0);
1286 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1287 avio_wb16(pb, ts - mkv->cluster_pts);
1289 avio_write(pb, data + offset, size);
1290 if (data != pkt->data)
1293 if (side_data_size && additional_id == 1) {
1294 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1295 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1296 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1297 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1298 put_ebml_num(pb, side_data_size, 0);
1299 avio_write(pb, side_data, side_data_size);
1300 end_ebml_master(pb, block_more);
1301 end_ebml_master(pb, block_additions);
1302 end_ebml_master(pb, block_group);
1306 static int srt_get_duration(uint8_t **buf)
1308 int i, duration = 0;
1310 for (i=0; i<2 && !duration; i++) {
1311 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1312 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1313 &s_hour, &s_min, &s_sec, &s_hsec,
1314 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1315 s_min += 60*s_hour; e_min += 60*e_hour;
1316 s_sec += 60*s_min; e_sec += 60*e_min;
1317 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1318 duration = e_hsec - s_hsec;
1320 *buf += strcspn(*buf, "\n") + 1;
1325 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1327 ebml_master blockgroup;
1328 AVPacket pkt2 = *pkt;
1329 int64_t duration = srt_get_duration(&pkt2.data);
1330 pkt2.size -= pkt2.data - pkt->data;
1332 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1333 mkv_blockgroup_size(pkt2.size));
1334 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1335 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1336 end_ebml_master(pb, blockgroup);
1341 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1343 MatroskaMuxContext *mkv = s->priv_data;
1344 ebml_master blockgroup;
1345 int id_size, settings_size, size;
1346 uint8_t *id, *settings;
1347 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1348 const int flags = 0;
1351 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1355 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1358 size = id_size + 1 + settings_size + 1 + pkt->size;
1360 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1361 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1362 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1364 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1366 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1367 put_ebml_num(pb, size+4, 0);
1368 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1369 avio_wb16(pb, ts - mkv->cluster_pts);
1371 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1373 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1374 end_ebml_master(pb, blockgroup);
1376 return pkt->duration;
1379 static void mkv_flush_dynbuf(AVFormatContext *s)
1381 MatroskaMuxContext *mkv = s->priv_data;
1388 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1389 avio_write(s->pb, dyn_buf, bufsize);
1394 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1396 MatroskaMuxContext *mkv = s->priv_data;
1397 AVIOContext *pb = s->pb;
1398 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1399 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1400 int duration = pkt->duration;
1402 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1404 if (ts == AV_NOPTS_VALUE) {
1405 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1406 return AVERROR(EINVAL);
1409 if (!s->pb->seekable) {
1411 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1412 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1419 if (mkv->cluster_pos == -1) {
1420 mkv->cluster_pos = avio_tell(s->pb);
1421 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1422 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1423 mkv->cluster_pts = FFMAX(0, ts);
1426 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1427 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1429 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1430 duration = mkv_write_ass_blocks(s, pb, pkt);
1432 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1433 duration = mkv_write_srt_blocks(s, pb, pkt);
1434 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1435 duration = mkv_write_vtt_blocks(s, pb, pkt);
1437 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1438 /* For backward compatibility, prefer convergence_duration. */
1439 if (pkt->convergence_duration > 0) {
1440 duration = pkt->convergence_duration;
1442 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1443 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1444 end_ebml_master(pb, blockgroup);
1447 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1448 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1449 if (ret < 0) return ret;
1452 mkv->duration = FFMAX(mkv->duration, ts + duration);
1456 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1458 MatroskaMuxContext *mkv = s->priv_data;
1459 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1460 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1461 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1462 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1463 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1465 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1466 // after 4k and on a keyframe
1467 if (mkv->cluster_pos != -1 &&
1468 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1469 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1470 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1471 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1472 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1473 end_ebml_master(pb, mkv->cluster);
1474 mkv->cluster_pos = -1;
1476 mkv_flush_dynbuf(s);
1479 // check if we have an audio packet cached
1480 if (mkv->cur_audio_pkt.size > 0) {
1481 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1482 av_free_packet(&mkv->cur_audio_pkt);
1484 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1489 // buffer an audio packet to ensure the packet containing the video
1490 // keyframe's timecode is contained in the same cluster for WebM
1491 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1492 mkv->cur_audio_pkt = *pkt;
1494 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1495 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1497 ret = av_dup_packet(&mkv->cur_audio_pkt);
1499 ret = mkv_write_packet_internal(s, pkt);
1503 static int mkv_write_trailer(AVFormatContext *s)
1505 MatroskaMuxContext *mkv = s->priv_data;
1506 AVIOContext *pb = s->pb;
1507 int64_t currentpos, cuespos;
1510 // check if we have an audio packet cached
1511 if (mkv->cur_audio_pkt.size > 0) {
1512 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1513 av_free_packet(&mkv->cur_audio_pkt);
1515 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1521 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1522 mkv_flush_dynbuf(s);
1523 } else if (mkv->cluster_pos != -1) {
1524 end_ebml_master(pb, mkv->cluster);
1528 if (mkv->cues->num_entries) {
1529 if (mkv->reserve_cues_space) {
1532 currentpos = avio_tell(pb);
1533 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1535 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1536 cues_end = avio_tell(pb);
1537 if (cues_end > cuespos + mkv->reserve_cues_space) {
1538 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1539 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1540 cues_end - cuespos);
1541 return AVERROR(EINVAL);
1544 if (cues_end < cuespos + mkv->reserve_cues_space)
1545 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1547 avio_seek(pb, currentpos, SEEK_SET);
1549 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1552 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1553 if (ret < 0) return ret;
1556 mkv_write_seekhead(pb, mkv->main_seekhead);
1558 // update the duration
1559 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1560 currentpos = avio_tell(pb);
1561 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1562 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1564 avio_seek(pb, currentpos, SEEK_SET);
1567 end_ebml_master(pb, mkv->segment);
1568 av_free(mkv->tracks);
1569 av_freep(&mkv->cues->entries);
1570 av_freep(&mkv->cues);
1575 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1578 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1579 if (ff_mkv_codec_tags[i].id == codec_id)
1582 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1583 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1584 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1591 const AVCodecTag additional_audio_tags[] = {
1592 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1593 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1594 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1595 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1596 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1597 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1598 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1599 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1600 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1601 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1602 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1603 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1604 { AV_CODEC_ID_WAVPACK, 0xFFFFFFFF },
1605 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1608 const AVCodecTag additional_video_tags[] = {
1609 { AV_CODEC_ID_PRORES, 0xFFFFFFFF },
1610 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1611 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1612 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1613 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1614 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1615 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1618 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1619 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1620 static const AVOption options[] = {
1621 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning "
1622 "of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1626 #if CONFIG_MATROSKA_MUXER
1627 static const AVClass matroska_class = {
1628 .class_name = "matroska muxer",
1629 .item_name = av_default_item_name,
1631 .version = LIBAVUTIL_VERSION_INT,
1634 AVOutputFormat ff_matroska_muxer = {
1636 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1637 .mime_type = "video/x-matroska",
1638 .extensions = "mkv",
1639 .priv_data_size = sizeof(MatroskaMuxContext),
1640 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1641 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1642 .video_codec = CONFIG_LIBX264_ENCODER ?
1643 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1644 .write_header = mkv_write_header,
1645 .write_packet = mkv_write_packet,
1646 .write_trailer = mkv_write_trailer,
1647 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1649 .codec_tag = (const AVCodecTag* const []){
1650 ff_codec_bmp_tags, ff_codec_wav_tags,
1651 additional_audio_tags, additional_video_tags, 0
1654 .subtitle_codec = AV_CODEC_ID_SSA,
1656 .subtitle_codec = AV_CODEC_ID_ASS,
1658 .query_codec = mkv_query_codec,
1659 .priv_class = &matroska_class,
1663 #if CONFIG_WEBM_MUXER
1664 static const AVClass webm_class = {
1665 .class_name = "webm muxer",
1666 .item_name = av_default_item_name,
1668 .version = LIBAVUTIL_VERSION_INT,
1671 AVOutputFormat ff_webm_muxer = {
1673 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1674 .mime_type = "video/webm",
1675 .extensions = "webm",
1676 .priv_data_size = sizeof(MatroskaMuxContext),
1677 .audio_codec = AV_CODEC_ID_VORBIS,
1678 .video_codec = AV_CODEC_ID_VP8,
1679 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1680 .write_header = mkv_write_header,
1681 .write_packet = mkv_write_packet,
1682 .write_trailer = mkv_write_trailer,
1683 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1685 .priv_class = &webm_class,
1689 #if CONFIG_MATROSKA_AUDIO_MUXER
1690 static const AVClass mka_class = {
1691 .class_name = "matroska audio muxer",
1692 .item_name = av_default_item_name,
1694 .version = LIBAVUTIL_VERSION_INT,
1696 AVOutputFormat ff_matroska_audio_muxer = {
1698 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1699 .mime_type = "audio/x-matroska",
1700 .extensions = "mka",
1701 .priv_data_size = sizeof(MatroskaMuxContext),
1702 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1703 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1704 .video_codec = AV_CODEC_ID_NONE,
1705 .write_header = mkv_write_header,
1706 .write_packet = mkv_write_packet,
1707 .write_trailer = mkv_write_trailer,
1708 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
1709 .codec_tag = (const AVCodecTag* const []){
1710 ff_codec_wav_tags, additional_audio_tags, 0
1712 .priv_class = &mka_class,