3 * Copyright (c) 2007 David Conrad
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "avlanguage.h"
33 #include "vorbiscomment.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/channel_layout.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lfg.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/random_seed.h"
45 #include "libavutil/samplefmt.h"
47 #include "libavcodec/xiph.h"
48 #include "libavcodec/mpeg4audio.h"
50 typedef struct ebml_master {
51 int64_t pos; ///< absolute offset in the file where the master's elements start
52 int sizebytes; ///< how many bytes were reserved for the size
55 typedef struct mkv_seekhead_entry {
56 unsigned int elementid;
60 typedef struct mkv_seekhead {
62 int64_t segment_offset; ///< the file offset to the beginning of the segment
63 int reserved_size; ///< -1 if appending to file
65 mkv_seekhead_entry *entries;
72 int64_t cluster_pos; ///< file offset of the cluster containing the block
76 int64_t segment_offset;
77 mkv_cuepoint *entries;
86 #define MODE_MATROSKAv2 0x01
87 #define MODE_WEBM 0x02
89 typedef struct MatroskaMuxContext {
94 int64_t segment_offset;
96 int64_t cluster_pos; ///< file offset of the current cluster
98 int64_t duration_offset;
100 mkv_seekhead *main_seekhead;
104 AVPacket cur_audio_pkt;
106 int have_attachments;
108 int reserve_cues_space;
109 int cluster_size_limit;
111 int64_t cluster_time_limit;
113 } MatroskaMuxContext;
116 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
117 * offset, 4 bytes for target EBML ID */
118 #define MAX_SEEKENTRY_SIZE 21
120 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
122 #define MAX_CUETRACKPOS_SIZE 22
124 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
125 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
127 static int ebml_id_size(unsigned int id)
129 return (av_log2(id + 1) - 1) / 7 + 1;
132 static void put_ebml_id(AVIOContext *pb, unsigned int id)
134 int i = ebml_id_size(id);
136 avio_w8(pb, id >> (i * 8));
140 * Write an EBML size meaning "unknown size".
142 * @param bytes The number of bytes the size should occupy (maximum: 8).
144 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
147 avio_w8(pb, 0x1ff >> bytes);
153 * Calculate how many bytes are needed to represent a given number in EBML.
155 static int ebml_num_size(uint64_t num)
158 while ((num + 1) >> bytes * 7)
164 * Write a number in EBML variable length format.
166 * @param bytes The number of bytes that need to be used to write the number.
167 * If zero, any number of bytes can be used.
169 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
171 int i, needed_bytes = ebml_num_size(num);
173 // sizes larger than this are currently undefined in EBML
174 assert(num < (1ULL << 56) - 1);
177 // don't care how many bytes are used, so use the min
178 bytes = needed_bytes;
179 // the bytes needed to write the given size would exceed the bytes
180 // that we need to use, so write unknown size. This shouldn't happen.
181 assert(bytes >= needed_bytes);
183 num |= 1ULL << bytes * 7;
184 for (i = bytes - 1; i >= 0; i--)
185 avio_w8(pb, num >> i * 8);
188 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
195 put_ebml_id(pb, elementid);
196 put_ebml_num(pb, bytes, 0);
197 for (i = bytes - 1; i >= 0; i--)
198 avio_w8(pb, val >> i * 8);
201 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
203 put_ebml_id(pb, elementid);
204 put_ebml_num(pb, 8, 0);
205 avio_wb64(pb, av_double2int(val));
208 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
209 const void *buf, int size)
211 put_ebml_id(pb, elementid);
212 put_ebml_num(pb, size, 0);
213 avio_write(pb, buf, size);
216 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
219 put_ebml_binary(pb, elementid, str, strlen(str));
223 * Write a void element of a given size. Useful for reserving space in
224 * the file to be written to later.
226 * @param size The number of bytes to reserve, which must be at least 2.
228 static void put_ebml_void(AVIOContext *pb, uint64_t size)
230 int64_t currentpos = avio_tell(pb);
234 put_ebml_id(pb, EBML_ID_VOID);
235 // we need to subtract the length needed to store the size from the
236 // size we need to reserve so 2 cases, we use 8 bytes to store the
237 // size if possible, 1 byte otherwise
239 put_ebml_num(pb, size - 1, 0);
241 put_ebml_num(pb, size - 9, 8);
242 while (avio_tell(pb) < currentpos + size)
246 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
247 uint64_t expectedsize)
249 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
250 put_ebml_id(pb, elementid);
251 put_ebml_size_unknown(pb, bytes);
252 return (ebml_master) {avio_tell(pb), bytes };
255 static void end_ebml_master(AVIOContext *pb, ebml_master master)
257 int64_t pos = avio_tell(pb);
259 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
261 put_ebml_num(pb, pos - master.pos, master.sizebytes);
262 avio_seek(pb, pos, SEEK_SET);
265 static void put_xiph_size(AVIOContext *pb, int size)
268 for (i = 0; i < size / 255; i++)
270 avio_w8(pb, size % 255);
274 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
275 * elements. If a maximum number of elements is specified, enough space
276 * will be reserved at the current file location to write a seek head of
279 * @param segment_offset The absolute offset to the position in the file
280 * where the segment begins.
281 * @param numelements The maximum number of elements that will be indexed
282 * by this seek head, 0 if unlimited.
284 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
287 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
288 if (new_seekhead == NULL)
291 new_seekhead->segment_offset = segment_offset;
293 if (numelements > 0) {
294 new_seekhead->filepos = avio_tell(pb);
295 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
296 // and size, and 3 bytes to guarantee that an EBML void element
297 // will fit afterwards
298 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
299 new_seekhead->max_entries = numelements;
300 put_ebml_void(pb, new_seekhead->reserved_size);
305 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
309 // don't store more elements than we reserved space for
310 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
313 if ((err = av_reallocp_array(&seekhead->entries, seekhead->num_entries + 1,
314 sizeof(*seekhead->entries))) < 0) {
315 seekhead->num_entries = 0;
319 seekhead->entries[seekhead->num_entries].elementid = elementid;
320 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
326 * Write the seek head to the file and free it. If a maximum number of
327 * elements was specified to mkv_start_seekhead(), the seek head will
328 * be written at the location reserved for it. Otherwise, it is written
329 * at the current location in the file.
331 * @return The file offset where the seekhead was written,
332 * -1 if an error occurred.
334 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
336 ebml_master metaseek, seekentry;
340 currentpos = avio_tell(pb);
342 if (seekhead->reserved_size > 0) {
343 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
349 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
350 for (i = 0; i < seekhead->num_entries; i++) {
351 mkv_seekhead_entry *entry = &seekhead->entries[i];
353 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
355 put_ebml_id(pb, MATROSKA_ID_SEEKID);
356 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
357 put_ebml_id(pb, entry->elementid);
359 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
360 end_ebml_master(pb, seekentry);
362 end_ebml_master(pb, metaseek);
364 if (seekhead->reserved_size > 0) {
365 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
366 put_ebml_void(pb, remaining);
367 avio_seek(pb, currentpos, SEEK_SET);
369 currentpos = seekhead->filepos;
372 av_free(seekhead->entries);
378 static mkv_cues *mkv_start_cues(int64_t segment_offset)
380 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
384 cues->segment_offset = segment_offset;
388 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
395 if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
396 sizeof(*cues->entries))) < 0) {
397 cues->num_entries = 0;
401 cues->entries[cues->num_entries].pts = ts;
402 cues->entries[cues->num_entries].tracknum = stream + 1;
403 cues->entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
408 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
410 ebml_master cues_element;
414 currentpos = avio_tell(pb);
415 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
417 for (i = 0; i < cues->num_entries; i++) {
418 ebml_master cuepoint, track_positions;
419 mkv_cuepoint *entry = &cues->entries[i];
420 uint64_t pts = entry->pts;
422 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
423 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
425 // put all the entries from different tracks that have the exact same
426 // timestamp into the same CuePoint
427 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
428 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
429 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
430 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
431 end_ebml_master(pb, track_positions);
434 end_ebml_master(pb, cuepoint);
436 end_ebml_master(pb, cues_element);
441 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
443 uint8_t *header_start[3];
445 int first_header_size;
448 if (codec->codec_id == AV_CODEC_ID_VORBIS)
449 first_header_size = 30;
451 first_header_size = 42;
453 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
454 first_header_size, header_start, header_len) < 0) {
455 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
459 avio_w8(pb, 2); // number packets - 1
460 for (j = 0; j < 2; j++) {
461 put_xiph_size(pb, header_len[j]);
463 for (j = 0; j < 3; j++)
464 avio_write(pb, header_start[j], header_len[j]);
469 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
471 if (codec->extradata && codec->extradata_size == 2)
472 avio_write(pb, codec->extradata, 2);
474 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
478 static int put_flac_codecpriv(AVFormatContext *s,
479 AVIOContext *pb, AVCodecContext *codec)
481 int write_comment = (codec->channel_layout &&
482 !(codec->channel_layout & ~0x3ffffULL) &&
483 !ff_flac_is_native_layout(codec->channel_layout));
484 int ret = ff_flac_write_header(pb, codec->extradata, codec->extradata_size,
491 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
492 "Libav" : LIBAVFORMAT_IDENT;
493 AVDictionary *dict = NULL;
494 uint8_t buf[32], *data, *p;
497 snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
498 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
500 len = ff_vorbiscomment_length(dict, vendor);
501 data = av_malloc(len + 4);
504 return AVERROR(ENOMEM);
508 AV_WB24(data + 1, len);
511 ff_vorbiscomment_write(&p, &dict, vendor);
513 avio_write(pb, data, len + 4);
522 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec,
523 int *sample_rate, int *output_sample_rate)
525 MPEG4AudioConfig mp4ac;
527 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
528 codec->extradata_size * 8, 1) < 0) {
529 av_log(s, AV_LOG_WARNING,
530 "Error parsing AAC extradata, unable to determine samplerate.\n");
534 *sample_rate = mp4ac.sample_rate;
535 *output_sample_rate = mp4ac.ext_sample_rate;
538 static int mkv_write_native_codecprivate(AVFormatContext *s,
539 AVCodecContext *codec,
542 switch (codec->codec_id) {
543 case AV_CODEC_ID_VORBIS:
544 case AV_CODEC_ID_THEORA:
545 return put_xiph_codecpriv(s, dyn_cp, codec);
546 case AV_CODEC_ID_FLAC:
547 return put_flac_codecpriv(s, dyn_cp, codec);
548 case AV_CODEC_ID_WAVPACK:
549 return put_wv_codecpriv(dyn_cp, codec);
550 case AV_CODEC_ID_H264:
551 return ff_isom_write_avcc(dyn_cp, codec->extradata,
552 codec->extradata_size);
553 case AV_CODEC_ID_HEVC:
554 return ff_isom_write_hvcc(dyn_cp, codec->extradata,
555 codec->extradata_size, 0);
556 case AV_CODEC_ID_ALAC:
557 if (codec->extradata_size < 36) {
558 av_log(s, AV_LOG_ERROR,
559 "Invalid extradata found, ALAC expects a 36-byte "
561 return AVERROR_INVALIDDATA;
563 avio_write(dyn_cp, codec->extradata + 12,
564 codec->extradata_size - 12);
567 if (codec->extradata_size)
568 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
574 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
575 AVCodecContext *codec, int native_id,
580 int ret, codecpriv_size;
582 ret = avio_open_dyn_buf(&dyn_cp);
587 ret = mkv_write_native_codecprivate(s, codec, dyn_cp);
588 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
590 if (!codec->codec_tag)
591 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
593 if (codec->extradata_size)
594 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
596 if (!codec->codec_tag)
597 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
599 if (!codec->codec_tag) {
600 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
604 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
606 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
608 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
610 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
613 if (!codec->codec_tag)
614 codec->codec_tag = tag;
616 ff_put_wav_header(dyn_cp, codec);
619 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
621 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
627 static void mkv_write_stereo_mode(AVIOContext *pb, uint8_t stereo_fmt,
634 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM ||
635 stereo_fmt == MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
638 case MODE_MATROSKAv2:
639 if (stereo_fmt <= MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL)
645 put_ebml_uint (pb, MATROSKA_ID_VIDEOSTEREOMODE, stereo_fmt);
648 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
649 int i, AVIOContext *pb)
651 AVStream *st = s->streams[i];
652 AVCodecContext *codec = st->codec;
653 ebml_master subinfo, track;
656 int bit_depth = av_get_bits_per_sample(codec->codec_id);
657 int sample_rate = codec->sample_rate;
658 int output_sample_rate = 0;
660 AVDictionaryEntry *tag;
662 // ms precision is the de-facto standard timescale for mkv files
663 avpriv_set_pts_info(st, 64, 1, 1000);
665 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
666 mkv->have_attachments = 1;
671 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
673 if (codec->codec_id == AV_CODEC_ID_AAC)
674 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
676 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
677 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
678 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
679 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
681 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
682 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
683 tag = av_dict_get(st->metadata, "language", NULL, 0);
684 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
686 // The default value for TRACKFLAGDEFAULT is 1, so add element
687 // if we need to clear it.
688 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
689 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
691 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->delay) {
692 mkv->tracks[i].ts_offset = av_rescale_q(codec->delay,
693 (AVRational){ 1, codec->sample_rate },
696 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
697 av_rescale_q(codec->delay, (AVRational){ 1, codec->sample_rate },
698 (AVRational){ 1, 1000000000 }));
701 // look for a codec ID string specific to mkv to use,
702 // if none are found, use AVI codes
703 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
704 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
705 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
711 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
712 codec->codec_id == AV_CODEC_ID_VP9 ||
713 codec->codec_id == AV_CODEC_ID_OPUS ||
714 codec->codec_id == AV_CODEC_ID_VORBIS)) {
715 av_log(s, AV_LOG_ERROR,
716 "Only VP8 or VP9 video and Vorbis or Opus audio are supported for WebM.\n");
717 return AVERROR(EINVAL);
720 switch (codec->codec_type) {
721 case AVMEDIA_TYPE_VIDEO:
722 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
723 if (st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0)
724 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9 / av_q2d(st->avg_frame_rate));
727 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
728 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id) ||
729 codec->codec_id == AV_CODEC_ID_SVQ1 ||
730 codec->codec_id == AV_CODEC_ID_SVQ3 ||
731 codec->codec_id == AV_CODEC_ID_CINEPAK))
735 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
736 else if (!native_id) {
737 // if there is no mkv-specific codec ID, use VFW mode
738 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
739 mkv->tracks[i].write_dts = 1;
742 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
743 // XXX: interlace flag?
744 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
745 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
746 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
747 mkv_write_stereo_mode(pb, atoi(tag->value), mkv->mode);
749 if (st->sample_aspect_ratio.num) {
750 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
751 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
752 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
753 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
755 end_ebml_master(pb, subinfo);
758 case AVMEDIA_TYPE_AUDIO:
759 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
762 // no mkv-specific ID, use ACM mode
763 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
765 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
766 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
767 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
768 if (output_sample_rate)
769 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
771 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
772 end_ebml_master(pb, subinfo);
775 case AVMEDIA_TYPE_SUBTITLE:
776 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
778 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
779 return AVERROR(ENOSYS);
783 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
786 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
790 end_ebml_master(pb, track);
795 static int mkv_write_tracks(AVFormatContext *s)
797 MatroskaMuxContext *mkv = s->priv_data;
798 AVIOContext *pb = s->pb;
802 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
806 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
807 for (i = 0; i < s->nb_streams; i++) {
808 ret = mkv_write_track(s, mkv, i, pb);
812 end_ebml_master(pb, tracks);
816 static int mkv_write_chapters(AVFormatContext *s)
818 MatroskaMuxContext *mkv = s->priv_data;
819 AVIOContext *pb = s->pb;
820 ebml_master chapters, editionentry;
821 AVRational scale = {1, 1E9};
824 if (!s->nb_chapters || mkv->wrote_chapters)
827 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
828 if (ret < 0) return ret;
830 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
831 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
832 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
833 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
834 for (i = 0; i < s->nb_chapters; i++) {
835 ebml_master chapteratom, chapterdisplay;
836 AVChapter *c = s->chapters[i];
837 AVDictionaryEntry *t = NULL;
839 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
840 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
841 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
842 av_rescale_q(c->start, c->time_base, scale));
843 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
844 av_rescale_q(c->end, c->time_base, scale));
845 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
846 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
847 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
848 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
849 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
850 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
851 end_ebml_master(pb, chapterdisplay);
853 end_ebml_master(pb, chapteratom);
855 end_ebml_master(pb, editionentry);
856 end_ebml_master(pb, chapters);
858 mkv->wrote_chapters = 1;
862 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
864 uint8_t *key = av_strdup(t->key);
866 const uint8_t *lang = NULL;
869 if ((p = strrchr(p, '-')) &&
870 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
877 else if (*p >= 'a' && *p <= 'z')
882 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
883 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
885 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
886 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
887 end_ebml_master(pb, tag);
892 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
893 unsigned int uid, ebml_master *tags)
895 MatroskaMuxContext *mkv = s->priv_data;
896 ebml_master tag, targets;
897 AVDictionaryEntry *t = NULL;
901 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
902 if (ret < 0) return ret;
904 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
907 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
908 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
910 put_ebml_uint(s->pb, elementid, uid);
911 end_ebml_master(s->pb, targets);
913 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
914 if (av_strcasecmp(t->key, "title") &&
915 av_strcasecmp(t->key, "encoding_tool"))
916 mkv_write_simpletag(s->pb, t);
918 end_ebml_master(s->pb, tag);
922 static int mkv_write_tags(AVFormatContext *s)
924 ebml_master tags = {0};
927 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
929 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
930 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
931 if (ret < 0) return ret;
934 for (i = 0; i < s->nb_streams; i++) {
935 AVStream *st = s->streams[i];
937 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
940 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
941 if (ret < 0) return ret;
944 for (i = 0; i < s->nb_chapters; i++) {
945 AVChapter *ch = s->chapters[i];
947 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
950 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
951 if (ret < 0) return ret;
955 end_ebml_master(s->pb, tags);
959 static int mkv_write_attachments(AVFormatContext *s)
961 MatroskaMuxContext *mkv = s->priv_data;
962 AVIOContext *pb = s->pb;
963 ebml_master attachments;
967 if (!mkv->have_attachments)
970 av_lfg_init(&c, av_get_random_seed());
972 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
973 if (ret < 0) return ret;
975 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
977 for (i = 0; i < s->nb_streams; i++) {
978 AVStream *st = s->streams[i];
979 ebml_master attached_file;
980 AVDictionaryEntry *t;
981 const char *mimetype = NULL;
983 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
986 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
988 if (t = av_dict_get(st->metadata, "title", NULL, 0))
989 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
990 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
991 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
992 return AVERROR(EINVAL);
994 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
995 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
997 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
999 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1000 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
1001 mimetype = ff_mkv_mime_tags[i].str;
1006 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1007 "it cannot be deduced from the codec id.\n", i);
1008 return AVERROR(EINVAL);
1011 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1012 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1013 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
1014 end_ebml_master(pb, attached_file);
1016 end_ebml_master(pb, attachments);
1021 static int mkv_write_header(AVFormatContext *s)
1023 MatroskaMuxContext *mkv = s->priv_data;
1024 AVIOContext *pb = s->pb;
1025 ebml_master ebml_header, segment_info;
1026 AVDictionaryEntry *tag;
1029 if (!strcmp(s->oformat->name, "webm"))
1030 mkv->mode = MODE_WEBM;
1032 mkv->mode = MODE_MATROSKAv2;
1034 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1036 return AVERROR(ENOMEM);
1038 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1039 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1040 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1041 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1042 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1043 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1044 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
1045 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1046 end_ebml_master(pb, ebml_header);
1048 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1049 mkv->segment_offset = avio_tell(pb);
1051 // we write 2 seek heads - one at the end of the file to point to each
1052 // cluster, and one at the beginning to point to all other level one
1053 // elements (including the seek head at the end of the file), which
1054 // isn't more than 10 elements if we only write one of each other
1055 // currently defined level 1 element
1056 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1057 if (!mkv->main_seekhead)
1058 return AVERROR(ENOMEM);
1060 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1061 if (ret < 0) return ret;
1063 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1064 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1065 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1066 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1067 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1068 uint32_t segment_uid[4];
1071 av_lfg_init(&lfg, av_get_random_seed());
1073 for (i = 0; i < 4; i++)
1074 segment_uid[i] = av_lfg_get(&lfg);
1076 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1077 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1078 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1080 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1081 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1084 // reserve space for the duration
1086 mkv->duration_offset = avio_tell(pb);
1087 put_ebml_void(pb, 11); // assumes double-precision float to be written
1088 end_ebml_master(pb, segment_info);
1090 ret = mkv_write_tracks(s);
1094 if (mkv->mode != MODE_WEBM) {
1095 ret = mkv_write_chapters(s);
1099 ret = mkv_write_tags(s);
1103 ret = mkv_write_attachments(s);
1108 if (!s->pb->seekable)
1109 mkv_write_seekhead(pb, mkv->main_seekhead);
1111 mkv->cues = mkv_start_cues(mkv->segment_offset);
1112 if (mkv->cues == NULL)
1113 return AVERROR(ENOMEM);
1115 if (pb->seekable && mkv->reserve_cues_space) {
1116 mkv->cues_pos = avio_tell(pb);
1117 put_ebml_void(pb, mkv->reserve_cues_space);
1120 av_init_packet(&mkv->cur_audio_pkt);
1121 mkv->cur_audio_pkt.size = 0;
1125 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1126 // after 4k and on a keyframe
1128 if (mkv->cluster_time_limit < 0)
1129 mkv->cluster_time_limit = 5000;
1130 if (mkv->cluster_size_limit < 0)
1131 mkv->cluster_size_limit = 5 * 1024 * 1024;
1133 if (mkv->cluster_time_limit < 0)
1134 mkv->cluster_time_limit = 1000;
1135 if (mkv->cluster_size_limit < 0)
1136 mkv->cluster_size_limit = 32 * 1024;
1142 static int mkv_blockgroup_size(int pkt_size)
1144 int size = pkt_size + 4;
1145 size += ebml_num_size(size);
1146 size += 2; // EBML ID for block and block duration
1147 size += 8; // max size of block duration
1148 size += ebml_num_size(size);
1149 size += 1; // blockgroup EBML ID
1153 static int ass_get_duration(const uint8_t *p)
1155 int sh, sm, ss, sc, eh, em, es, ec;
1156 uint64_t start, end;
1158 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1159 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1161 start = 3600000 * sh + 60000 * sm + 1000 * ss + 10 * sc;
1162 end = 3600000 * eh + 60000 * em + 1000 * es + 10 * ec;
1166 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb,
1169 MatroskaMuxContext *mkv = s->priv_data;
1170 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1171 uint8_t *start, *end, *data = pkt->data;
1172 ebml_master blockgroup;
1176 int duration = ass_get_duration(data);
1177 max_duration = FFMAX(duration, max_duration);
1178 end = memchr(data, '\n', data_size);
1179 size = line_size = end ? end - data + 1 : data_size;
1180 size -= end ? (end[-1] == '\r') + 1 : 0;
1182 for (i = 0; i < 3; i++, start++)
1183 if (!(start = memchr(start, ',', size - (start - data))))
1184 return max_duration;
1185 size -= start - data;
1186 sscanf(data, "Dialogue: %d,", &layer);
1187 i = snprintf(buffer, sizeof(buffer), "%" PRId64 ",%d,",
1188 s->streams[pkt->stream_index]->nb_frames, layer);
1189 size = FFMIN(i + size, sizeof(buffer));
1190 memcpy(buffer + i, start, size - i);
1192 av_log(s, AV_LOG_DEBUG,
1193 "Writing block at offset %" PRIu64 ", size %d, "
1194 "pts %" PRId64 ", duration %d\n",
1195 avio_tell(pb), size, pkt->pts, duration);
1196 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1197 mkv_blockgroup_size(size));
1198 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1199 put_ebml_num(pb, size + 4, 0);
1200 // this assumes stream_index is less than 126
1201 avio_w8(pb, 0x80 | (pkt->stream_index + 1));
1202 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1204 avio_write(pb, buffer, size);
1205 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1206 end_ebml_master(pb, blockgroup);
1209 data_size -= line_size;
1212 return max_duration;
1215 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1222 dst = av_malloc(srclen);
1224 return AVERROR(ENOMEM);
1226 while (srclen >= WV_HEADER_SIZE) {
1229 ret = ff_wv_parse_header(&header, src);
1232 src += WV_HEADER_SIZE;
1233 srclen -= WV_HEADER_SIZE;
1235 if (srclen < header.blocksize) {
1236 ret = AVERROR_INVALIDDATA;
1240 if (header.initial) {
1241 AV_WL32(dst + offset, header.samples);
1244 AV_WL32(dst + offset, header.flags);
1245 AV_WL32(dst + offset + 4, header.crc);
1248 if (!(header.initial && header.final)) {
1249 AV_WL32(dst + offset, header.blocksize);
1253 memcpy(dst + offset, src, header.blocksize);
1254 src += header.blocksize;
1255 srclen -= header.blocksize;
1256 offset += header.blocksize;
1268 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1269 unsigned int blockid, AVPacket *pkt, int flags)
1271 MatroskaMuxContext *mkv = s->priv_data;
1272 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1273 uint8_t *data = NULL;
1274 int offset = 0, size = pkt->size;
1275 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1277 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1278 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1279 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1280 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1281 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1282 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1283 else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 &&
1284 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1285 /* extradata is Annex B, assume the bitstream is too and convert it */
1286 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1287 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1288 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1290 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1296 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1297 /* Matroska specification requires to remove the first QuickTime atom
1303 put_ebml_id(pb, blockid);
1304 put_ebml_num(pb, size + 4, 0);
1305 // this assumes stream_index is less than 126
1306 avio_w8(pb, 0x80 | (pkt->stream_index + 1));
1307 avio_wb16(pb, ts - mkv->cluster_pts);
1309 avio_write(pb, data + offset, size);
1310 if (data != pkt->data)
1314 static int srt_get_duration(uint8_t **buf)
1316 int i, duration = 0;
1318 for (i = 0; i < 2 && !duration; i++) {
1319 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1320 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1321 &s_hour, &s_min, &s_sec, &s_hsec,
1322 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1323 s_min += 60 * s_hour;
1324 e_min += 60 * e_hour;
1325 s_sec += 60 * s_min;
1327 e_sec += 60 * e_min;
1328 s_hsec += 1000 * s_sec;
1329 e_hsec += 1000 * e_sec;
1331 duration = e_hsec - s_hsec;
1333 *buf += strcspn(*buf, "\n") + 1;
1338 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb,
1341 ebml_master blockgroup;
1342 AVPacket pkt2 = *pkt;
1343 int64_t duration = srt_get_duration(&pkt2.data);
1344 pkt2.size -= pkt2.data - pkt->data;
1346 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1347 mkv_blockgroup_size(pkt2.size));
1348 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1349 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1350 end_ebml_master(pb, blockgroup);
1355 static void mkv_flush_dynbuf(AVFormatContext *s)
1357 MatroskaMuxContext *mkv = s->priv_data;
1364 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1365 avio_write(s->pb, dyn_buf, bufsize);
1370 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1372 MatroskaMuxContext *mkv = s->priv_data;
1373 AVIOContext *pb = s->pb;
1374 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1375 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1376 int duration = pkt->duration;
1378 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1380 if (ts == AV_NOPTS_VALUE) {
1381 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1382 return AVERROR(EINVAL);
1384 ts += mkv->tracks[pkt->stream_index].ts_offset;
1386 if (!s->pb->seekable) {
1388 avio_open_dyn_buf(&mkv->dyn_bc);
1392 if (!mkv->cluster_pos) {
1393 mkv->cluster_pos = avio_tell(s->pb);
1394 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1395 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1396 mkv->cluster_pts = FFMAX(0, ts);
1399 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1400 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1401 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1402 duration = mkv_write_ass_blocks(s, pb, pkt);
1403 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1404 duration = mkv_write_srt_blocks(s, pb, pkt);
1406 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1407 mkv_blockgroup_size(pkt->size));
1408 duration = pkt->convergence_duration;
1409 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1410 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1411 end_ebml_master(pb, blockgroup);
1414 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1415 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts,
1421 mkv->duration = FFMAX(mkv->duration, ts + duration);
1425 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1427 MatroskaMuxContext *mkv = s->priv_data;
1428 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1429 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1431 int64_t cluster_time;
1435 if (mkv->tracks[pkt->stream_index].write_dts)
1436 cluster_time = pkt->dts - mkv->cluster_pts;
1438 cluster_time = pkt->pts - mkv->cluster_pts;
1439 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1441 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1442 // after 4k and on a keyframe
1443 if (s->pb->seekable) {
1445 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1448 cluster_size = avio_tell(pb);
1451 if (mkv->cluster_pos &&
1452 (cluster_size > mkv->cluster_size_limit ||
1453 cluster_time > mkv->cluster_time_limit ||
1454 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1455 cluster_size > 4 * 1024))) {
1456 av_log(s, AV_LOG_DEBUG,
1457 "Starting new cluster at offset %" PRIu64 " bytes, "
1458 "pts %" PRIu64 "dts %" PRIu64 "\n",
1459 avio_tell(pb), pkt->pts, pkt->dts);
1460 end_ebml_master(pb, mkv->cluster);
1461 mkv->cluster_pos = 0;
1463 mkv_flush_dynbuf(s);
1467 // check if we have an audio packet cached
1468 if (mkv->cur_audio_pkt.size > 0) {
1469 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1470 av_free_packet(&mkv->cur_audio_pkt);
1472 av_log(s, AV_LOG_ERROR,
1473 "Could not write cached audio packet ret:%d\n", ret);
1478 // buffer an audio packet to ensure the packet containing the video
1479 // keyframe's timecode is contained in the same cluster for WebM
1480 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1481 mkv->cur_audio_pkt = *pkt;
1483 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1484 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1486 ret = av_dup_packet(&mkv->cur_audio_pkt);
1488 ret = mkv_write_packet_internal(s, pkt);
1492 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1494 MatroskaMuxContext *mkv = s->priv_data;
1496 if (s->pb->seekable)
1501 if (mkv->cluster_pos) {
1502 av_log(s, AV_LOG_DEBUG,
1503 "Flushing cluster at offset %" PRIu64 " bytes\n",
1505 end_ebml_master(pb, mkv->cluster);
1506 mkv->cluster_pos = 0;
1508 mkv_flush_dynbuf(s);
1513 return mkv_write_packet(s, pkt);
1516 static int mkv_write_trailer(AVFormatContext *s)
1518 MatroskaMuxContext *mkv = s->priv_data;
1519 AVIOContext *pb = s->pb;
1520 int64_t currentpos, cuespos;
1523 // check if we have an audio packet cached
1524 if (mkv->cur_audio_pkt.size > 0) {
1525 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1526 av_free_packet(&mkv->cur_audio_pkt);
1528 av_log(s, AV_LOG_ERROR,
1529 "Could not write cached audio packet ret:%d\n", ret);
1535 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1536 mkv_flush_dynbuf(s);
1537 } else if (mkv->cluster_pos) {
1538 end_ebml_master(pb, mkv->cluster);
1541 if (mkv->mode != MODE_WEBM) {
1542 ret = mkv_write_chapters(s);
1548 if (mkv->cues->num_entries) {
1549 if (mkv->reserve_cues_space) {
1552 currentpos = avio_tell(pb);
1553 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1555 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1556 cues_end = avio_tell(pb);
1557 if (cues_end > cuespos + mkv->reserve_cues_space) {
1558 av_log(s, AV_LOG_ERROR,
1559 "Insufficient space reserved for cues: %d "
1560 "(needed: %" PRId64 ").\n",
1561 mkv->reserve_cues_space, cues_end - cuespos);
1562 return AVERROR(EINVAL);
1565 if (cues_end < cuespos + mkv->reserve_cues_space)
1566 put_ebml_void(pb, mkv->reserve_cues_space -
1567 (cues_end - cuespos));
1569 avio_seek(pb, currentpos, SEEK_SET);
1571 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1574 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
1580 mkv_write_seekhead(pb, mkv->main_seekhead);
1582 // update the duration
1583 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1584 currentpos = avio_tell(pb);
1585 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1586 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1588 avio_seek(pb, currentpos, SEEK_SET);
1591 end_ebml_master(pb, mkv->segment);
1592 av_free(mkv->tracks);
1593 av_freep(&mkv->cues->entries);
1594 av_freep(&mkv->cues);
1599 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1602 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1603 if (ff_mkv_codec_tags[i].id == codec_id)
1606 if (std_compliance < FF_COMPLIANCE_NORMAL) {
1607 enum AVMediaType type = avcodec_get_type(codec_id);
1608 // mkv theoretically supports any video/audio through VFW/ACM
1609 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1616 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1617 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1618 static const AVOption options[] = {
1619 { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
1620 { "cluster_size_limit", "Store at most the provided amount of bytes in a cluster. ", OFFSET(cluster_size_limit), AV_OPT_TYPE_INT , { .i64 = -1 }, -1, INT_MAX, FLAGS },
1621 { "cluster_time_limit", "Store at most the provided number of milliseconds in a cluster.", OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
1625 #if CONFIG_MATROSKA_MUXER
1626 static const AVClass matroska_class = {
1627 .class_name = "matroska muxer",
1628 .item_name = av_default_item_name,
1630 .version = LIBAVUTIL_VERSION_INT,
1633 AVOutputFormat ff_matroska_muxer = {
1635 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1636 .mime_type = "video/x-matroska",
1637 .extensions = "mkv",
1638 .priv_data_size = sizeof(MatroskaMuxContext),
1639 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1640 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1641 .video_codec = CONFIG_LIBX264_ENCODER ?
1642 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1643 .write_header = mkv_write_header,
1644 .write_packet = mkv_write_flush_packet,
1645 .write_trailer = mkv_write_trailer,
1646 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1647 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1648 .codec_tag = (const AVCodecTag* const []){
1649 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1651 .subtitle_codec = AV_CODEC_ID_SSA,
1652 .query_codec = mkv_query_codec,
1653 .priv_class = &matroska_class,
1657 #if CONFIG_WEBM_MUXER
1658 static const AVClass webm_class = {
1659 .class_name = "webm muxer",
1660 .item_name = av_default_item_name,
1662 .version = LIBAVUTIL_VERSION_INT,
1665 AVOutputFormat ff_webm_muxer = {
1667 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1668 .mime_type = "video/webm",
1669 .extensions = "webm",
1670 .priv_data_size = sizeof(MatroskaMuxContext),
1671 .audio_codec = AV_CODEC_ID_VORBIS,
1672 .video_codec = AV_CODEC_ID_VP8,
1673 .write_header = mkv_write_header,
1674 .write_packet = mkv_write_flush_packet,
1675 .write_trailer = mkv_write_trailer,
1676 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1677 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1678 .priv_class = &webm_class,
1682 #if CONFIG_MATROSKA_AUDIO_MUXER
1683 static const AVClass mka_class = {
1684 .class_name = "matroska audio muxer",
1685 .item_name = av_default_item_name,
1687 .version = LIBAVUTIL_VERSION_INT,
1689 AVOutputFormat ff_matroska_audio_muxer = {
1691 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1692 .mime_type = "audio/x-matroska",
1693 .extensions = "mka",
1694 .priv_data_size = sizeof(MatroskaMuxContext),
1695 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1696 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1697 .video_codec = AV_CODEC_ID_NONE,
1698 .write_header = mkv_write_header,
1699 .write_packet = mkv_write_flush_packet,
1700 .write_trailer = mkv_write_trailer,
1701 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1703 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1704 .priv_class = &mka_class,