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 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
605 if (default_stream_exists) {
606 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
608 if (st->disposition & AV_DISPOSITION_FORCED)
609 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
611 // look for a codec ID string specific to mkv to use,
612 // if none are found, use AVI codes
613 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
614 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
615 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
621 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
622 codec->codec_id == AV_CODEC_ID_VORBIS)) {
623 av_log(s, AV_LOG_ERROR,
624 "Only VP8 video and Vorbis audio are supported for WebM.\n");
625 return AVERROR(EINVAL);
628 switch (codec->codec_type) {
629 case AVMEDIA_TYPE_VIDEO:
630 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
631 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
632 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
634 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
637 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
638 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
639 || codec->codec_id == AV_CODEC_ID_SVQ1
640 || codec->codec_id == AV_CODEC_ID_SVQ3
641 || codec->codec_id == AV_CODEC_ID_CINEPAK))
645 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
646 else if (!native_id) {
647 // if there is no mkv-specific codec ID, use VFW mode
648 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
649 mkv->tracks[i].write_dts = 1;
652 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
653 // XXX: interlace flag?
654 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
655 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
657 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
658 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
659 // save stereo mode flag
660 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
662 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
663 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
668 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
669 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
670 av_log(s, AV_LOG_ERROR,
671 "The specified stereo mode is not valid.\n");
672 return AVERROR(EINVAL);
674 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
677 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
678 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
679 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
680 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
683 if (st->sample_aspect_ratio.num) {
684 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
685 if (d_width > INT_MAX) {
686 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
687 return AVERROR(EINVAL);
689 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
690 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
693 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
694 uint32_t color_space = av_le2ne32(codec->codec_tag);
695 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
697 end_ebml_master(pb, subinfo);
700 case AVMEDIA_TYPE_AUDIO:
701 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
704 // no mkv-specific ID, use ACM mode
705 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
707 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
708 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
709 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
710 if (output_sample_rate)
711 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
713 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
714 end_ebml_master(pb, subinfo);
717 case AVMEDIA_TYPE_SUBTITLE:
718 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
720 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
721 return AVERROR(ENOSYS);
725 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
726 return AVERROR(EINVAL);
728 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
729 if (ret < 0) return ret;
731 end_ebml_master(pb, track);
733 // ms precision is the de-facto standard timescale for mkv files
734 avpriv_set_pts_info(st, 64, 1, 1000);
736 end_ebml_master(pb, tracks);
740 static int mkv_write_chapters(AVFormatContext *s)
742 MatroskaMuxContext *mkv = s->priv_data;
743 AVIOContext *pb = s->pb;
744 ebml_master chapters, editionentry;
745 AVRational scale = {1, 1E9};
751 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
752 if (ret < 0) return ret;
754 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
755 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
756 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
757 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
758 for (i = 0; i < s->nb_chapters; i++) {
759 ebml_master chapteratom, chapterdisplay;
760 AVChapter *c = s->chapters[i];
761 AVDictionaryEntry *t = NULL;
763 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
764 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
765 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
766 av_rescale_q(c->start, c->time_base, scale));
767 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
768 av_rescale_q(c->end, c->time_base, scale));
769 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
770 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
771 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
772 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
773 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
774 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
775 end_ebml_master(pb, chapterdisplay);
777 end_ebml_master(pb, chapteratom);
779 end_ebml_master(pb, editionentry);
780 end_ebml_master(pb, chapters);
784 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
786 uint8_t *key = av_strdup(t->key);
788 const uint8_t *lang = NULL;
791 if ((p = strrchr(p, '-')) &&
792 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
799 else if (*p >= 'a' && *p <= 'z')
804 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
805 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
807 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
808 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
809 end_ebml_master(pb, tag);
814 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
815 unsigned int uid, ebml_master *tags)
817 MatroskaMuxContext *mkv = s->priv_data;
818 ebml_master tag, targets;
819 AVDictionaryEntry *t = NULL;
823 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
824 if (ret < 0) return ret;
826 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
829 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
830 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
832 put_ebml_uint(s->pb, elementid, uid);
833 end_ebml_master(s->pb, targets);
835 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
836 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
837 mkv_write_simpletag(s->pb, t);
839 end_ebml_master(s->pb, tag);
843 static int mkv_write_tags(AVFormatContext *s)
845 ebml_master tags = {0};
848 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
850 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
851 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
852 if (ret < 0) return ret;
855 for (i = 0; i < s->nb_streams; i++) {
856 AVStream *st = s->streams[i];
858 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
861 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
862 if (ret < 0) return ret;
865 for (i = 0; i < s->nb_chapters; i++) {
866 AVChapter *ch = s->chapters[i];
868 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
871 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
872 if (ret < 0) return ret;
876 end_ebml_master(s->pb, tags);
880 static int mkv_write_attachments(AVFormatContext *s)
882 MatroskaMuxContext *mkv = s->priv_data;
883 AVIOContext *pb = s->pb;
884 ebml_master attachments;
888 if (!mkv->have_attachments)
891 av_lfg_init(&c, av_get_random_seed());
893 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
894 if (ret < 0) return ret;
896 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
898 for (i = 0; i < s->nb_streams; i++) {
899 AVStream *st = s->streams[i];
900 ebml_master attached_file;
901 AVDictionaryEntry *t;
902 const char *mimetype = NULL;
905 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
908 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
910 if (t = av_dict_get(st->metadata, "title", NULL, 0))
911 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
912 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
913 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
914 return AVERROR(EINVAL);
916 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
917 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
919 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
921 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
922 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
923 mimetype = ff_mkv_mime_tags[i].str;
928 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
929 "it cannot be deduced from the codec id.\n", i);
930 return AVERROR(EINVAL);
933 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
934 struct AVSHA *sha = av_sha_alloc();
937 return AVERROR(ENOMEM);
938 av_sha_init(sha, 160);
939 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
940 av_sha_final(sha, digest);
942 fileuid = AV_RL64(digest);
944 fileuid = av_lfg_get(&c);
946 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
949 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
950 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
951 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
952 end_ebml_master(pb, attached_file);
954 end_ebml_master(pb, attachments);
959 static int mkv_write_header(AVFormatContext *s)
961 MatroskaMuxContext *mkv = s->priv_data;
962 AVIOContext *pb = s->pb;
963 ebml_master ebml_header, segment_info;
964 AVDictionaryEntry *tag;
967 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
968 else mkv->mode = MODE_MATROSKAv2;
970 if (s->avoid_negative_ts < 0)
971 s->avoid_negative_ts = 1;
973 for (i = 0; i < s->nb_streams; i++)
974 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
975 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
976 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
977 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
978 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
979 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
980 av_log(s, AV_LOG_ERROR,
981 "The Matroska muxer does not yet support muxing %s\n",
982 avcodec_get_name(s->streams[i]->codec->codec_id));
983 return AVERROR_PATCHWELCOME;
986 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
988 return AVERROR(ENOMEM);
990 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
991 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
992 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
993 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
994 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
995 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
996 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
997 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
998 end_ebml_master(pb, ebml_header);
1000 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1001 mkv->segment_offset = avio_tell(pb);
1003 // we write 2 seek heads - one at the end of the file to point to each
1004 // cluster, and one at the beginning to point to all other level one
1005 // elements (including the seek head at the end of the file), which
1006 // isn't more than 10 elements if we only write one of each other
1007 // currently defined level 1 element
1008 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1009 if (!mkv->main_seekhead)
1010 return AVERROR(ENOMEM);
1012 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1013 if (ret < 0) return ret;
1015 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1016 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1017 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1018 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1019 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1020 uint32_t segment_uid[4];
1023 av_lfg_init(&lfg, av_get_random_seed());
1025 for (i = 0; i < 4; i++)
1026 segment_uid[i] = av_lfg_get(&lfg);
1028 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1029 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1030 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1033 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1034 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1035 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1036 uint8_t date_utc_buf[8];
1037 AV_WB64(date_utc_buf, date_utc);
1038 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1041 // reserve space for the duration
1043 mkv->duration_offset = avio_tell(pb);
1044 put_ebml_void(pb, 11); // assumes double-precision float to be written
1045 end_ebml_master(pb, segment_info);
1047 ret = mkv_write_tracks(s);
1048 if (ret < 0) return ret;
1050 if (mkv->mode != MODE_WEBM) {
1051 ret = mkv_write_chapters(s);
1052 if (ret < 0) return ret;
1054 ret = mkv_write_tags(s);
1055 if (ret < 0) return ret;
1057 ret = mkv_write_attachments(s);
1058 if (ret < 0) return ret;
1061 if (!s->pb->seekable)
1062 mkv_write_seekhead(pb, mkv->main_seekhead);
1064 mkv->cues = mkv_start_cues(mkv->segment_offset);
1065 if (mkv->cues == NULL)
1066 return AVERROR(ENOMEM);
1068 if (pb->seekable && mkv->reserve_cues_space) {
1069 mkv->cues_pos = avio_tell(pb);
1070 put_ebml_void(pb, mkv->reserve_cues_space);
1073 av_init_packet(&mkv->cur_audio_pkt);
1074 mkv->cur_audio_pkt.size = 0;
1075 mkv->cluster_pos = -1;
1081 static int mkv_blockgroup_size(int pkt_size)
1083 int size = pkt_size + 4;
1084 size += ebml_num_size(size);
1085 size += 2; // EBML ID for block and block duration
1086 size += 8; // max size of block duration
1087 size += ebml_num_size(size);
1088 size += 1; // blockgroup EBML ID
1092 static int ass_get_duration(const uint8_t *p)
1094 int sh, sm, ss, sc, eh, em, es, ec;
1095 uint64_t start, end;
1097 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1098 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1100 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1101 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1106 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1108 MatroskaMuxContext *mkv = s->priv_data;
1109 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1110 uint8_t *start, *end, *data = pkt->data;
1111 ebml_master blockgroup;
1115 int duration = ass_get_duration(data);
1116 max_duration = FFMAX(duration, max_duration);
1117 end = memchr(data, '\n', data_size);
1118 size = line_size = end ? end-data+1 : data_size;
1119 size -= end ? (end[-1]=='\r')+1 : 0;
1121 for (i=0; i<3; i++, start++)
1122 if (!(start = memchr(start, ',', size-(start-data))))
1123 return max_duration;
1124 size -= start - data;
1125 sscanf(data, "Dialogue: %d,", &layer);
1126 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1127 s->streams[pkt->stream_index]->nb_frames, layer);
1128 size = FFMIN(i+size, sizeof(buffer));
1129 memcpy(buffer+i, start, size-i);
1131 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1132 "pts %" PRId64 ", duration %d\n",
1133 avio_tell(pb), size, pkt->pts, duration);
1134 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1135 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1136 put_ebml_num(pb, size+4, 0);
1137 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1138 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1140 avio_write(pb, buffer, size);
1141 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1142 end_ebml_master(pb, blockgroup);
1145 data_size -= line_size;
1148 return max_duration;
1152 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1159 dst = av_malloc(srclen);
1161 return AVERROR(ENOMEM);
1163 while (srclen >= WV_HEADER_SIZE) {
1166 ret = ff_wv_parse_header(&header, src);
1169 src += WV_HEADER_SIZE;
1170 srclen -= WV_HEADER_SIZE;
1172 if (srclen < header.blocksize) {
1173 ret = AVERROR_INVALIDDATA;
1177 if (header.initial) {
1178 AV_WL32(dst + offset, header.samples);
1181 AV_WL32(dst + offset, header.flags);
1182 AV_WL32(dst + offset + 4, header.crc);
1185 if (!(header.initial && header.final)) {
1186 AV_WL32(dst + offset, header.blocksize);
1190 memcpy(dst + offset, src, header.blocksize);
1191 src += header.blocksize;
1192 srclen -= header.blocksize;
1193 offset += header.blocksize;
1205 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1206 unsigned int blockid, AVPacket *pkt, int flags)
1208 MatroskaMuxContext *mkv = s->priv_data;
1209 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1210 uint8_t *data = NULL, *side_data = NULL;
1211 int offset = 0, size = pkt->size, side_data_size = 0;
1212 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1213 uint64_t additional_id = 0;
1214 ebml_master block_group, block_additions, block_more;
1216 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1217 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1218 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1219 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1220 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1221 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1222 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1223 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1225 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1231 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1232 /* Matroska specification requires to remove the first QuickTime atom
1238 side_data = av_packet_get_side_data(pkt,
1239 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1242 additional_id = AV_RB64(side_data);
1244 side_data_size -= 8;
1247 if (side_data_size && additional_id == 1) {
1248 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1249 blockid = MATROSKA_ID_BLOCK;
1252 put_ebml_id(pb, blockid);
1253 put_ebml_num(pb, size+4, 0);
1254 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1255 avio_wb16(pb, ts - mkv->cluster_pts);
1257 avio_write(pb, data + offset, size);
1258 if (data != pkt->data)
1261 if (side_data_size && additional_id == 1) {
1262 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1263 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1264 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1265 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1266 put_ebml_num(pb, side_data_size, 0);
1267 avio_write(pb, side_data, side_data_size);
1268 end_ebml_master(pb, block_more);
1269 end_ebml_master(pb, block_additions);
1270 end_ebml_master(pb, block_group);
1274 static int srt_get_duration(uint8_t **buf)
1276 int i, duration = 0;
1278 for (i=0; i<2 && !duration; i++) {
1279 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1280 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1281 &s_hour, &s_min, &s_sec, &s_hsec,
1282 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1283 s_min += 60*s_hour; e_min += 60*e_hour;
1284 s_sec += 60*s_min; e_sec += 60*e_min;
1285 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1286 duration = e_hsec - s_hsec;
1288 *buf += strcspn(*buf, "\n") + 1;
1293 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1295 ebml_master blockgroup;
1296 AVPacket pkt2 = *pkt;
1297 int64_t duration = srt_get_duration(&pkt2.data);
1298 pkt2.size -= pkt2.data - pkt->data;
1300 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1301 mkv_blockgroup_size(pkt2.size));
1302 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1303 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1304 end_ebml_master(pb, blockgroup);
1309 static void mkv_flush_dynbuf(AVFormatContext *s)
1311 MatroskaMuxContext *mkv = s->priv_data;
1318 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1319 avio_write(s->pb, dyn_buf, bufsize);
1324 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1326 MatroskaMuxContext *mkv = s->priv_data;
1327 AVIOContext *pb = s->pb;
1328 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1329 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1330 int duration = pkt->duration;
1332 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1334 if (ts == AV_NOPTS_VALUE) {
1335 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1336 return AVERROR(EINVAL);
1339 if (!s->pb->seekable) {
1341 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1342 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1349 if (mkv->cluster_pos == -1) {
1350 mkv->cluster_pos = avio_tell(s->pb);
1351 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1352 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1353 mkv->cluster_pts = FFMAX(0, ts);
1356 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1357 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1359 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1360 duration = mkv_write_ass_blocks(s, pb, pkt);
1362 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1363 duration = mkv_write_srt_blocks(s, pb, pkt);
1365 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1366 /* For backward compatibility, prefer convergence_duration. */
1367 if (pkt->convergence_duration > 0) {
1368 duration = pkt->convergence_duration;
1370 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1371 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1372 end_ebml_master(pb, blockgroup);
1375 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1376 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1377 if (ret < 0) return ret;
1380 mkv->duration = FFMAX(mkv->duration, ts + duration);
1384 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1386 MatroskaMuxContext *mkv = s->priv_data;
1387 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1388 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1389 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1390 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1391 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1393 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1394 // after 4k and on a keyframe
1395 if (mkv->cluster_pos != -1 &&
1396 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1397 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1398 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1399 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1400 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1401 end_ebml_master(pb, mkv->cluster);
1402 mkv->cluster_pos = -1;
1404 mkv_flush_dynbuf(s);
1407 // check if we have an audio packet cached
1408 if (mkv->cur_audio_pkt.size > 0) {
1409 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1410 av_free_packet(&mkv->cur_audio_pkt);
1412 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1417 // buffer an audio packet to ensure the packet containing the video
1418 // keyframe's timecode is contained in the same cluster for WebM
1419 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1420 mkv->cur_audio_pkt = *pkt;
1421 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1422 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1424 ret = mkv_write_packet_internal(s, pkt);
1428 static int mkv_write_trailer(AVFormatContext *s)
1430 MatroskaMuxContext *mkv = s->priv_data;
1431 AVIOContext *pb = s->pb;
1432 int64_t currentpos, cuespos;
1435 // check if we have an audio packet cached
1436 if (mkv->cur_audio_pkt.size > 0) {
1437 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1438 av_free_packet(&mkv->cur_audio_pkt);
1440 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1446 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1447 mkv_flush_dynbuf(s);
1448 } else if (mkv->cluster_pos != -1) {
1449 end_ebml_master(pb, mkv->cluster);
1453 if (mkv->cues->num_entries) {
1454 if (mkv->reserve_cues_space) {
1457 currentpos = avio_tell(pb);
1458 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1460 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1461 cues_end = avio_tell(pb);
1462 if (cues_end > cuespos + mkv->reserve_cues_space) {
1463 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1464 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1465 cues_end - cuespos);
1466 return AVERROR(EINVAL);
1469 if (cues_end < cuespos + mkv->reserve_cues_space)
1470 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1472 avio_seek(pb, currentpos, SEEK_SET);
1474 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1477 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1478 if (ret < 0) return ret;
1481 mkv_write_seekhead(pb, mkv->main_seekhead);
1483 // update the duration
1484 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1485 currentpos = avio_tell(pb);
1486 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1487 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1489 avio_seek(pb, currentpos, SEEK_SET);
1492 end_ebml_master(pb, mkv->segment);
1493 av_free(mkv->tracks);
1494 av_freep(&mkv->cues->entries);
1495 av_freep(&mkv->cues);
1500 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1503 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1504 if (ff_mkv_codec_tags[i].id == codec_id)
1507 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1508 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1509 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1516 const AVCodecTag additional_audio_tags[] = {
1517 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1518 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1519 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1520 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1521 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1522 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1523 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1524 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1525 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1526 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1527 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1528 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1529 { AV_CODEC_ID_WAVPACK, 0xFFFFFFFF },
1530 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1533 const AVCodecTag additional_video_tags[] = {
1534 { AV_CODEC_ID_PRORES, 0xFFFFFFFF },
1535 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1536 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1537 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1538 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1539 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1540 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1543 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1544 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1545 static const AVOption options[] = {
1546 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning "
1547 "of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1551 #if CONFIG_MATROSKA_MUXER
1552 static const AVClass matroska_class = {
1553 .class_name = "matroska muxer",
1554 .item_name = av_default_item_name,
1556 .version = LIBAVUTIL_VERSION_INT,
1559 AVOutputFormat ff_matroska_muxer = {
1561 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1562 .mime_type = "video/x-matroska",
1563 .extensions = "mkv",
1564 .priv_data_size = sizeof(MatroskaMuxContext),
1565 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1566 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1567 .video_codec = CONFIG_LIBX264_ENCODER ?
1568 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1569 .write_header = mkv_write_header,
1570 .write_packet = mkv_write_packet,
1571 .write_trailer = mkv_write_trailer,
1572 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1574 .codec_tag = (const AVCodecTag* const []){
1575 ff_codec_bmp_tags, ff_codec_wav_tags,
1576 additional_audio_tags, additional_video_tags, 0
1579 .subtitle_codec = AV_CODEC_ID_SSA,
1581 .subtitle_codec = AV_CODEC_ID_ASS,
1583 .query_codec = mkv_query_codec,
1584 .priv_class = &matroska_class,
1588 #if CONFIG_WEBM_MUXER
1589 static const AVClass webm_class = {
1590 .class_name = "webm muxer",
1591 .item_name = av_default_item_name,
1593 .version = LIBAVUTIL_VERSION_INT,
1596 AVOutputFormat ff_webm_muxer = {
1598 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1599 .mime_type = "video/webm",
1600 .extensions = "webm",
1601 .priv_data_size = sizeof(MatroskaMuxContext),
1602 .audio_codec = AV_CODEC_ID_VORBIS,
1603 .video_codec = AV_CODEC_ID_VP8,
1604 .write_header = mkv_write_header,
1605 .write_packet = mkv_write_packet,
1606 .write_trailer = mkv_write_trailer,
1607 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1609 .priv_class = &webm_class,
1613 #if CONFIG_MATROSKA_AUDIO_MUXER
1614 static const AVClass mka_class = {
1615 .class_name = "matroska audio muxer",
1616 .item_name = av_default_item_name,
1618 .version = LIBAVUTIL_VERSION_INT,
1620 AVOutputFormat ff_matroska_audio_muxer = {
1622 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1623 .mime_type = "audio/x-matroska",
1624 .extensions = "mka",
1625 .priv_data_size = sizeof(MatroskaMuxContext),
1626 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1627 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1628 .video_codec = AV_CODEC_ID_NONE,
1629 .write_header = mkv_write_header,
1630 .write_packet = mkv_write_packet,
1631 .write_trailer = mkv_write_trailer,
1632 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
1633 .codec_tag = (const AVCodecTag* const []){
1634 ff_codec_wav_tags, additional_audio_tags, 0
1636 .priv_class = &mka_class,