3 * Copyright (c) 2007 David Conrad
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "avio_internal.h"
25 #include "avlanguage.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/intfloat.h"
36 #include "libavutil/intreadwrite.h"
37 #include "libavutil/lfg.h"
38 #include "libavutil/mathematics.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/random_seed.h"
41 #include "libavutil/samplefmt.h"
42 #include "libavutil/sha.h"
44 #include "libavcodec/xiph.h"
45 #include "libavcodec/mpeg4audio.h"
47 typedef struct ebml_master {
48 int64_t pos; ///< absolute offset in the file where the master's elements start
49 int sizebytes; ///< how many bytes were reserved for the size
52 typedef struct mkv_seekhead_entry {
53 unsigned int elementid;
57 typedef struct mkv_seekhead {
59 int64_t segment_offset; ///< the file offset to the beginning of the segment
60 int reserved_size; ///< -1 if appending to file
62 mkv_seekhead_entry *entries;
69 int64_t cluster_pos; ///< file offset of the cluster containing the block
70 int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
74 int64_t segment_offset;
75 mkv_cuepoint *entries;
84 #define MODE_MATROSKAv2 0x01
85 #define MODE_WEBM 0x02
87 typedef struct MatroskaMuxContext {
92 int64_t segment_offset;
94 int64_t cluster_pos; ///< file offset of the current cluster
96 int64_t duration_offset;
98 mkv_seekhead *main_seekhead;
102 AVPacket cur_audio_pkt;
104 int have_attachments;
106 int reserve_cues_space;
107 int cluster_size_limit;
109 int64_t cluster_time_limit;
111 uint32_t chapter_id_offset;
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 - 4 1-byte EBML IDs, 4 1-byte EBML sizes, 3
122 #define MAX_CUETRACKPOS_SIZE 32
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 /** Seek preroll value for opus */
128 #define OPUS_SEEK_PREROLL 80000000
131 static int ebml_id_size(unsigned int id)
133 return (av_log2(id+1)-1)/7+1;
136 static void put_ebml_id(AVIOContext *pb, unsigned int id)
138 int i = ebml_id_size(id);
140 avio_w8(pb, (uint8_t)(id >> (i*8)));
144 * Write an EBML size meaning "unknown size".
146 * @param bytes The number of bytes the size should occupy (maximum: 8).
148 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
150 av_assert0(bytes <= 8);
151 avio_w8(pb, 0x1ff >> bytes);
152 ffio_fill(pb, 0xff, bytes - 1);
156 * Calculate how many bytes are needed to represent a given number in EBML.
158 static int ebml_num_size(uint64_t num)
161 while ((num+1) >> bytes*7) bytes++;
166 * Write a number in EBML variable length format.
168 * @param bytes The number of bytes that need to be used to write the number.
169 * If zero, any number of bytes can be used.
171 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
173 int i, needed_bytes = ebml_num_size(num);
175 // sizes larger than this are currently undefined in EBML
176 av_assert0(num < (1ULL<<56)-1);
179 // don't care how many bytes are used, so use the min
180 bytes = needed_bytes;
181 // the bytes needed to write the given size would exceed the bytes
182 // that we need to use, so write unknown size. This shouldn't happen.
183 av_assert0(bytes >= needed_bytes);
185 num |= 1ULL << bytes*7;
186 for (i = bytes - 1; i >= 0; i--)
187 avio_w8(pb, (uint8_t)(num >> i*8));
190 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
194 while (tmp>>=8) bytes++;
196 put_ebml_id(pb, elementid);
197 put_ebml_num(pb, bytes, 0);
198 for (i = bytes - 1; i >= 0; i--)
199 avio_w8(pb, (uint8_t)(val >> i*8));
202 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
204 put_ebml_id(pb, elementid);
205 put_ebml_num(pb, 8, 0);
206 avio_wb64(pb, av_double2int(val));
209 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
210 const void *buf, int size)
212 put_ebml_id(pb, elementid);
213 put_ebml_num(pb, size, 0);
214 avio_write(pb, buf, size);
217 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
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);
232 av_assert0(size >= 2);
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 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
245 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
247 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
248 put_ebml_id(pb, elementid);
249 put_ebml_size_unknown(pb, bytes);
250 return (ebml_master){ avio_tell(pb), bytes };
253 static void end_ebml_master(AVIOContext *pb, ebml_master master)
255 int64_t pos = avio_tell(pb);
257 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
259 put_ebml_num(pb, pos - master.pos, master.sizebytes);
260 avio_seek(pb, pos, SEEK_SET);
263 static void put_xiph_size(AVIOContext *pb, int size)
265 ffio_fill(pb, 255, size / 255);
266 avio_w8(pb, size % 255);
270 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
271 * elements. If a maximum number of elements is specified, enough space
272 * will be reserved at the current file location to write a seek head of
275 * @param segment_offset The absolute offset to the position in the file
276 * where the segment begins.
277 * @param numelements The maximum number of elements that will be indexed
278 * by this seek head, 0 if unlimited.
280 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
282 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
283 if (new_seekhead == NULL)
286 new_seekhead->segment_offset = segment_offset;
288 if (numelements > 0) {
289 new_seekhead->filepos = avio_tell(pb);
290 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
291 // and size, and 3 bytes to guarantee that an EBML void element
292 // will fit afterwards
293 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
294 new_seekhead->max_entries = numelements;
295 put_ebml_void(pb, new_seekhead->reserved_size);
300 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
302 mkv_seekhead_entry *entries = seekhead->entries;
304 // don't store more elements than we reserved space for
305 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
308 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
310 return AVERROR(ENOMEM);
312 entries[seekhead->num_entries ].elementid = elementid;
313 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
315 seekhead->entries = entries;
320 * Write the seek head to the file and free it. If a maximum number of
321 * elements was specified to mkv_start_seekhead(), the seek head will
322 * be written at the location reserved for it. Otherwise, it is written
323 * at the current location in the file.
325 * @return The file offset where the seekhead was written,
326 * -1 if an error occurred.
328 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
330 ebml_master metaseek, seekentry;
334 currentpos = avio_tell(pb);
336 if (seekhead->reserved_size > 0) {
337 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
343 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
344 for (i = 0; i < seekhead->num_entries; i++) {
345 mkv_seekhead_entry *entry = &seekhead->entries[i];
347 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
349 put_ebml_id(pb, MATROSKA_ID_SEEKID);
350 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
351 put_ebml_id(pb, entry->elementid);
353 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
354 end_ebml_master(pb, seekentry);
356 end_ebml_master(pb, metaseek);
358 if (seekhead->reserved_size > 0) {
359 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
360 put_ebml_void(pb, remaining);
361 avio_seek(pb, currentpos, SEEK_SET);
363 currentpos = seekhead->filepos;
366 av_free(seekhead->entries);
372 static mkv_cues * mkv_start_cues(int64_t segment_offset)
374 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
378 cues->segment_offset = segment_offset;
382 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos)
384 mkv_cuepoint *entries = cues->entries;
389 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
391 return AVERROR(ENOMEM);
393 entries[cues->num_entries ].pts = ts;
394 entries[cues->num_entries ].tracknum = stream + 1;
395 entries[cues->num_entries ].cluster_pos = cluster_pos - cues->segment_offset;
396 entries[cues->num_entries++].relative_pos = relative_pos;
398 cues->entries = entries;
402 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
404 ebml_master cues_element;
408 currentpos = avio_tell(pb);
409 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
411 for (i = 0; i < cues->num_entries; i++) {
412 ebml_master cuepoint, track_positions;
413 mkv_cuepoint *entry = &cues->entries[i];
414 uint64_t pts = entry->pts;
416 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
417 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
419 // put all the entries from different tracks that have the exact same
420 // timestamp into the same CuePoint
421 for (j = 0; j < num_tracks; j++)
422 tracks[j].has_cue = 0;
423 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
424 int tracknum = entry[j].tracknum - 1;
425 av_assert0(tracknum>=0 && tracknum<num_tracks);
426 if (tracks[tracknum].has_cue)
428 tracks[tracknum].has_cue = 1;
429 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
430 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
431 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
432 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
433 end_ebml_master(pb, track_positions);
436 end_ebml_master(pb, cuepoint);
438 end_ebml_master(pb, cues_element);
443 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
445 uint8_t *header_start[3];
447 int first_header_size;
450 if (codec->codec_id == AV_CODEC_ID_VORBIS)
451 first_header_size = 30;
453 first_header_size = 42;
455 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
456 first_header_size, header_start, header_len) < 0) {
457 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
461 avio_w8(pb, 2); // number packets - 1
462 for (j = 0; j < 2; j++) {
463 put_xiph_size(pb, header_len[j]);
465 for (j = 0; j < 3; j++)
466 avio_write(pb, header_start[j], header_len[j]);
471 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
473 if (codec->extradata && codec->extradata_size == 2)
474 avio_write(pb, codec->extradata, 2);
476 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
480 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
482 MPEG4AudioConfig mp4ac;
484 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
485 codec->extradata_size * 8, 1) < 0) {
486 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
490 *sample_rate = mp4ac.sample_rate;
491 *output_sample_rate = mp4ac.ext_sample_rate;
494 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
498 int ret, codecpriv_size;
500 ret = avio_open_dyn_buf(&dyn_cp);
505 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
506 ret = put_xiph_codecpriv(s, dyn_cp, codec);
507 else if (codec->codec_id == AV_CODEC_ID_FLAC)
508 ret = ff_flac_write_header(dyn_cp, codec, 1);
509 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
510 ret = put_wv_codecpriv(dyn_cp, codec);
511 else if (codec->codec_id == AV_CODEC_ID_H264)
512 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
513 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
514 if (codec->extradata_size < 36) {
515 av_log(s, AV_LOG_ERROR,
516 "Invalid extradata found, ALAC expects a 36-byte "
518 ret = AVERROR_INVALIDDATA;
520 avio_write(dyn_cp, codec->extradata + 12,
521 codec->extradata_size - 12);
523 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
524 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
525 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
527 if (!codec->codec_tag)
528 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
529 if (codec->extradata_size)
530 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
532 if (!codec->codec_tag)
533 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
534 if (!codec->codec_tag) {
535 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
536 avcodec_get_name(codec->codec_id));
537 ret = AVERROR(EINVAL);
540 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
543 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
545 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
547 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
548 avcodec_get_name(codec->codec_id));
549 ret = AVERROR(EINVAL);
551 if (!codec->codec_tag)
552 codec->codec_tag = tag;
554 ff_put_wav_header(dyn_cp, codec);
557 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
559 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
564 static int mkv_write_tracks(AVFormatContext *s)
566 MatroskaMuxContext *mkv = s->priv_data;
567 AVIOContext *pb = s->pb;
569 int i, j, ret, default_stream_exists = 0;
571 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
572 if (ret < 0) return ret;
574 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
575 for (i = 0; i < s->nb_streams; i++) {
576 AVStream *st = s->streams[i];
577 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
579 for (i = 0; i < s->nb_streams; i++) {
580 AVStream *st = s->streams[i];
581 AVCodecContext *codec = st->codec;
582 ebml_master subinfo, track;
585 int bit_depth = av_get_bits_per_sample(codec->codec_id);
586 int sample_rate = codec->sample_rate;
587 int output_sample_rate = 0;
588 AVDictionaryEntry *tag;
590 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
591 mkv->have_attachments = 1;
596 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
598 bit_depth = codec->bits_per_coded_sample;
600 if (codec->codec_id == AV_CODEC_ID_AAC)
601 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
603 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
604 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
605 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
606 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
608 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
609 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
610 tag = av_dict_get(st->metadata, "language", NULL, 0);
611 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
612 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
613 } else if (tag && tag->value) {
614 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
617 // The default value for TRACKFLAGDEFAULT is 1, so add element
618 // if we need to clear it.
619 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
620 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
622 if (st->disposition & AV_DISPOSITION_FORCED)
623 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
625 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
626 const char *codec_id;
627 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
628 codec_id = "D_WEBVTT/CAPTIONS";
629 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
630 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
631 codec_id = "D_WEBVTT/DESCRIPTIONS";
632 native_id = MATROSKA_TRACK_TYPE_METADATA;
633 } else if (st->disposition & AV_DISPOSITION_METADATA) {
634 codec_id = "D_WEBVTT/METADATA";
635 native_id = MATROSKA_TRACK_TYPE_METADATA;
637 codec_id = "D_WEBVTT/SUBTITLES";
638 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
640 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
642 // look for a codec ID string specific to mkv to use,
643 // if none are found, use AVI codes
644 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
645 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
646 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
653 if (codec->codec_id == AV_CODEC_ID_OPUS) {
654 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
657 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
658 codec->codec_id == AV_CODEC_ID_VP9 ||
659 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
660 codec->codec_id == AV_CODEC_ID_VORBIS ||
661 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
662 av_log(s, AV_LOG_ERROR,
663 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
664 return AVERROR(EINVAL);
667 switch (codec->codec_type) {
668 case AVMEDIA_TYPE_VIDEO:
669 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
670 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
671 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
673 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
676 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
677 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
678 || codec->codec_id == AV_CODEC_ID_SVQ1
679 || codec->codec_id == AV_CODEC_ID_SVQ3
680 || codec->codec_id == AV_CODEC_ID_CINEPAK))
684 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
685 else if (!native_id) {
686 // if there is no mkv-specific codec ID, use VFW mode
687 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
688 mkv->tracks[i].write_dts = 1;
691 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
692 // XXX: interlace flag?
693 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
694 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
696 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
697 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
698 // save stereo mode flag
699 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
701 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
702 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
707 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
708 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
709 av_log(s, AV_LOG_ERROR,
710 "The specified stereo mode is not valid.\n");
711 return AVERROR(EINVAL);
713 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
716 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
717 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
718 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
719 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
722 if (st->sample_aspect_ratio.num) {
723 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
724 if (d_width > INT_MAX) {
725 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
726 return AVERROR(EINVAL);
728 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
729 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
732 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
733 uint32_t color_space = av_le2ne32(codec->codec_tag);
734 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
736 end_ebml_master(pb, subinfo);
739 case AVMEDIA_TYPE_AUDIO:
740 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
743 // no mkv-specific ID, use ACM mode
744 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
746 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
747 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
748 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
749 if (output_sample_rate)
750 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
752 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
753 end_ebml_master(pb, subinfo);
756 case AVMEDIA_TYPE_SUBTITLE:
758 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
759 return AVERROR(ENOSYS);
762 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
763 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
765 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
768 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
769 return AVERROR(EINVAL);
772 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
773 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
774 if (ret < 0) return ret;
777 end_ebml_master(pb, track);
779 // ms precision is the de-facto standard timescale for mkv files
780 avpriv_set_pts_info(st, 64, 1, 1000);
782 end_ebml_master(pb, tracks);
786 static int mkv_write_chapters(AVFormatContext *s)
788 MatroskaMuxContext *mkv = s->priv_data;
789 AVIOContext *pb = s->pb;
790 ebml_master chapters, editionentry;
791 AVRational scale = {1, 1E9};
794 if (!s->nb_chapters || mkv->wrote_chapters)
797 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
798 if (ret < 0) return ret;
800 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
801 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
802 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
803 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
804 for (i = 0; i < s->nb_chapters; i++) {
805 ebml_master chapteratom, chapterdisplay;
806 AVChapter *c = s->chapters[i];
807 AVDictionaryEntry *t = NULL;
809 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
810 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
811 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
812 av_rescale_q(c->start, c->time_base, scale));
813 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
814 av_rescale_q(c->end, c->time_base, scale));
815 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
816 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
817 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
818 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
819 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
820 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
821 end_ebml_master(pb, chapterdisplay);
823 end_ebml_master(pb, chapteratom);
825 end_ebml_master(pb, editionentry);
826 end_ebml_master(pb, chapters);
828 mkv->wrote_chapters = 1;
832 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
834 uint8_t *key = av_strdup(t->key);
836 const uint8_t *lang = NULL;
839 if ((p = strrchr(p, '-')) &&
840 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
847 else if (*p >= 'a' && *p <= 'z')
852 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
853 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
855 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
856 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
857 end_ebml_master(pb, tag);
862 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
863 unsigned int uid, ebml_master *tags)
865 MatroskaMuxContext *mkv = s->priv_data;
866 ebml_master tag, targets;
867 AVDictionaryEntry *t = NULL;
871 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
872 if (ret < 0) return ret;
874 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
877 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
878 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
880 put_ebml_uint(s->pb, elementid, uid);
881 end_ebml_master(s->pb, targets);
883 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
884 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
885 mkv_write_simpletag(s->pb, t);
887 end_ebml_master(s->pb, tag);
891 static int mkv_check_tag(AVDictionary *m)
893 AVDictionaryEntry *t = NULL;
895 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
896 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
902 static int mkv_write_tags(AVFormatContext *s)
904 MatroskaMuxContext *mkv = s->priv_data;
905 ebml_master tags = {0};
908 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
910 if (mkv_check_tag(s->metadata)) {
911 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
912 if (ret < 0) return ret;
915 for (i = 0; i < s->nb_streams; i++) {
916 AVStream *st = s->streams[i];
918 if (!mkv_check_tag(st->metadata))
921 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
922 if (ret < 0) return ret;
925 for (i = 0; i < s->nb_chapters; i++) {
926 AVChapter *ch = s->chapters[i];
928 if (!mkv_check_tag(ch->metadata))
931 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
932 if (ret < 0) return ret;
936 end_ebml_master(s->pb, tags);
940 static int mkv_write_attachments(AVFormatContext *s)
942 MatroskaMuxContext *mkv = s->priv_data;
943 AVIOContext *pb = s->pb;
944 ebml_master attachments;
948 if (!mkv->have_attachments)
951 av_lfg_init(&c, av_get_random_seed());
953 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
954 if (ret < 0) return ret;
956 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
958 for (i = 0; i < s->nb_streams; i++) {
959 AVStream *st = s->streams[i];
960 ebml_master attached_file;
961 AVDictionaryEntry *t;
962 const char *mimetype = NULL;
965 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
968 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
970 if (t = av_dict_get(st->metadata, "title", NULL, 0))
971 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
972 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
973 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
974 return AVERROR(EINVAL);
976 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
977 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
979 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
981 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
982 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
983 mimetype = ff_mkv_mime_tags[i].str;
988 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
989 "it cannot be deduced from the codec id.\n", i);
990 return AVERROR(EINVAL);
993 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
994 struct AVSHA *sha = av_sha_alloc();
997 return AVERROR(ENOMEM);
998 av_sha_init(sha, 160);
999 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
1000 av_sha_final(sha, digest);
1002 fileuid = AV_RL64(digest);
1004 fileuid = av_lfg_get(&c);
1006 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1009 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1010 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1011 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1012 end_ebml_master(pb, attached_file);
1014 end_ebml_master(pb, attachments);
1019 static int mkv_write_header(AVFormatContext *s)
1021 MatroskaMuxContext *mkv = s->priv_data;
1022 AVIOContext *pb = s->pb;
1023 ebml_master ebml_header, segment_info;
1024 AVDictionaryEntry *tag;
1027 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1028 else mkv->mode = MODE_MATROSKAv2;
1030 if (s->avoid_negative_ts < 0)
1031 s->avoid_negative_ts = 1;
1033 for (i = 0; i < s->nb_streams; i++)
1034 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1035 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1036 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1037 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1038 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1039 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1040 av_log(s, AV_LOG_ERROR,
1041 "The Matroska muxer does not yet support muxing %s\n",
1042 avcodec_get_name(s->streams[i]->codec->codec_id));
1043 return AVERROR_PATCHWELCOME;
1046 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1048 return AVERROR(ENOMEM);
1050 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1051 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1052 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1053 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1054 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1055 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1056 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
1057 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1058 end_ebml_master(pb, ebml_header);
1060 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1061 mkv->segment_offset = avio_tell(pb);
1063 // we write 2 seek heads - one at the end of the file to point to each
1064 // cluster, and one at the beginning to point to all other level one
1065 // elements (including the seek head at the end of the file), which
1066 // isn't more than 10 elements if we only write one of each other
1067 // currently defined level 1 element
1068 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1069 if (!mkv->main_seekhead)
1070 return AVERROR(ENOMEM);
1072 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1073 if (ret < 0) return ret;
1075 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1076 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1077 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1078 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1079 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1080 uint32_t segment_uid[4];
1083 av_lfg_init(&lfg, av_get_random_seed());
1085 for (i = 0; i < 4; i++)
1086 segment_uid[i] = av_lfg_get(&lfg);
1088 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1089 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1090 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1093 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1094 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1095 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1096 uint8_t date_utc_buf[8];
1097 AV_WB64(date_utc_buf, date_utc);
1098 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1101 // reserve space for the duration
1103 mkv->duration_offset = avio_tell(pb);
1104 put_ebml_void(pb, 11); // assumes double-precision float to be written
1105 end_ebml_master(pb, segment_info);
1107 ret = mkv_write_tracks(s);
1108 if (ret < 0) return ret;
1110 for (i = 0; i < s->nb_chapters; i++)
1111 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1113 if (mkv->mode != MODE_WEBM) {
1114 ret = mkv_write_chapters(s);
1115 if (ret < 0) return ret;
1117 ret = mkv_write_tags(s);
1118 if (ret < 0) return ret;
1120 ret = mkv_write_attachments(s);
1121 if (ret < 0) return ret;
1124 if (!s->pb->seekable)
1125 mkv_write_seekhead(pb, mkv->main_seekhead);
1127 mkv->cues = mkv_start_cues(mkv->segment_offset);
1128 if (mkv->cues == NULL)
1129 return AVERROR(ENOMEM);
1131 if (pb->seekable && mkv->reserve_cues_space) {
1132 mkv->cues_pos = avio_tell(pb);
1133 put_ebml_void(pb, mkv->reserve_cues_space);
1136 av_init_packet(&mkv->cur_audio_pkt);
1137 mkv->cur_audio_pkt.size = 0;
1138 mkv->cluster_pos = -1;
1142 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1143 // after 4k and on a keyframe
1145 if (mkv->cluster_time_limit < 0)
1146 mkv->cluster_time_limit = 5000;
1147 if (mkv->cluster_size_limit < 0)
1148 mkv->cluster_size_limit = 5 * 1024 * 1024;
1150 if (mkv->cluster_time_limit < 0)
1151 mkv->cluster_time_limit = 1000;
1152 if (mkv->cluster_size_limit < 0)
1153 mkv->cluster_size_limit = 32 * 1024;
1159 static int mkv_blockgroup_size(int pkt_size)
1161 int size = pkt_size + 4;
1162 size += ebml_num_size(size);
1163 size += 2; // EBML ID for block and block duration
1164 size += 8; // max size of block duration
1165 size += ebml_num_size(size);
1166 size += 1; // blockgroup EBML ID
1170 static int ass_get_duration(const uint8_t *p)
1172 int sh, sm, ss, sc, eh, em, es, ec;
1173 uint64_t start, end;
1175 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1176 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1178 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1179 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1184 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1186 MatroskaMuxContext *mkv = s->priv_data;
1187 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1188 uint8_t *start, *end, *data = pkt->data;
1189 ebml_master blockgroup;
1193 int duration = ass_get_duration(data);
1194 max_duration = FFMAX(duration, max_duration);
1195 end = memchr(data, '\n', data_size);
1196 size = line_size = end ? end-data+1 : data_size;
1197 size -= end ? (end[-1]=='\r')+1 : 0;
1199 for (i=0; i<3; i++, start++)
1200 if (!(start = memchr(start, ',', size-(start-data))))
1201 return max_duration;
1202 size -= start - data;
1203 sscanf(data, "Dialogue: %d,", &layer);
1204 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1205 s->streams[pkt->stream_index]->nb_frames, layer);
1206 size = FFMIN(i+size, sizeof(buffer));
1207 memcpy(buffer+i, start, size-i);
1209 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1210 "pts %" PRId64 ", duration %d\n",
1211 avio_tell(pb), size, pkt->pts, duration);
1212 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1213 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1214 put_ebml_num(pb, size+4, 0);
1215 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1216 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1218 avio_write(pb, buffer, size);
1219 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1220 end_ebml_master(pb, blockgroup);
1223 data_size -= line_size;
1226 return max_duration;
1230 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1237 dst = av_malloc(srclen);
1239 return AVERROR(ENOMEM);
1241 while (srclen >= WV_HEADER_SIZE) {
1244 ret = ff_wv_parse_header(&header, src);
1247 src += WV_HEADER_SIZE;
1248 srclen -= WV_HEADER_SIZE;
1250 if (srclen < header.blocksize) {
1251 ret = AVERROR_INVALIDDATA;
1255 if (header.initial) {
1256 AV_WL32(dst + offset, header.samples);
1259 AV_WL32(dst + offset, header.flags);
1260 AV_WL32(dst + offset + 4, header.crc);
1263 if (!(header.initial && header.final)) {
1264 AV_WL32(dst + offset, header.blocksize);
1268 memcpy(dst + offset, src, header.blocksize);
1269 src += header.blocksize;
1270 srclen -= header.blocksize;
1271 offset += header.blocksize;
1283 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1284 unsigned int blockid, AVPacket *pkt, int flags)
1286 MatroskaMuxContext *mkv = s->priv_data;
1287 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1288 uint8_t *data = NULL, *side_data = NULL;
1289 int offset = 0, size = pkt->size, side_data_size = 0;
1290 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1291 uint64_t additional_id = 0;
1292 ebml_master block_group, block_additions, block_more;
1294 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1295 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1296 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1297 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1298 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1299 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1300 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1301 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1303 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1309 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1310 /* Matroska specification requires to remove the first QuickTime atom
1316 side_data = av_packet_get_side_data(pkt,
1317 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1320 additional_id = AV_RB64(side_data);
1322 side_data_size -= 8;
1325 if (side_data_size && additional_id == 1) {
1326 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1327 blockid = MATROSKA_ID_BLOCK;
1330 put_ebml_id(pb, blockid);
1331 put_ebml_num(pb, size+4, 0);
1332 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1333 avio_wb16(pb, ts - mkv->cluster_pts);
1335 avio_write(pb, data + offset, size);
1336 if (data != pkt->data)
1339 if (side_data_size && additional_id == 1) {
1340 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1341 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1342 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1343 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1344 put_ebml_num(pb, side_data_size, 0);
1345 avio_write(pb, side_data, side_data_size);
1346 end_ebml_master(pb, block_more);
1347 end_ebml_master(pb, block_additions);
1348 end_ebml_master(pb, block_group);
1352 static int srt_get_duration(uint8_t **buf)
1354 int i, duration = 0;
1356 for (i=0; i<2 && !duration; i++) {
1357 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1358 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1359 &s_hour, &s_min, &s_sec, &s_hsec,
1360 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1361 s_min += 60*s_hour; e_min += 60*e_hour;
1362 s_sec += 60*s_min; e_sec += 60*e_min;
1363 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1364 duration = e_hsec - s_hsec;
1366 *buf += strcspn(*buf, "\n") + 1;
1371 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1373 ebml_master blockgroup;
1374 AVPacket pkt2 = *pkt;
1375 int64_t duration = srt_get_duration(&pkt2.data);
1376 pkt2.size -= pkt2.data - pkt->data;
1378 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1379 mkv_blockgroup_size(pkt2.size));
1380 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1381 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1382 end_ebml_master(pb, blockgroup);
1387 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1389 MatroskaMuxContext *mkv = s->priv_data;
1390 ebml_master blockgroup;
1391 int id_size, settings_size, size;
1392 uint8_t *id, *settings;
1393 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1394 const int flags = 0;
1397 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1401 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1404 size = id_size + 1 + settings_size + 1 + pkt->size;
1406 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1407 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1408 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1410 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1412 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1413 put_ebml_num(pb, size+4, 0);
1414 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1415 avio_wb16(pb, ts - mkv->cluster_pts);
1417 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1419 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1420 end_ebml_master(pb, blockgroup);
1422 return pkt->duration;
1425 static void mkv_flush_dynbuf(AVFormatContext *s)
1427 MatroskaMuxContext *mkv = s->priv_data;
1434 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1435 avio_write(s->pb, dyn_buf, bufsize);
1440 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1442 MatroskaMuxContext *mkv = s->priv_data;
1443 AVIOContext *pb = s->pb;
1444 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1445 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1446 int duration = pkt->duration;
1448 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1449 int64_t relative_packet_pos;
1451 if (ts == AV_NOPTS_VALUE) {
1452 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1453 return AVERROR(EINVAL);
1456 if (!s->pb->seekable) {
1458 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1459 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1466 if (mkv->cluster_pos == -1) {
1467 mkv->cluster_pos = avio_tell(s->pb);
1468 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1469 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1470 mkv->cluster_pts = FFMAX(0, ts);
1473 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1475 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1476 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1478 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1479 duration = mkv_write_ass_blocks(s, pb, pkt);
1481 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1482 duration = mkv_write_srt_blocks(s, pb, pkt);
1483 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1484 duration = mkv_write_vtt_blocks(s, pb, pkt);
1486 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1487 /* For backward compatibility, prefer convergence_duration. */
1488 if (pkt->convergence_duration > 0) {
1489 duration = pkt->convergence_duration;
1491 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1492 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1493 end_ebml_master(pb, blockgroup);
1496 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1497 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos);
1498 if (ret < 0) return ret;
1501 mkv->duration = FFMAX(mkv->duration, ts + duration);
1505 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1507 MatroskaMuxContext *mkv = s->priv_data;
1508 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1509 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1511 int64_t cluster_time;
1515 if (mkv->tracks[pkt->stream_index].write_dts)
1516 cluster_time = pkt->dts - mkv->cluster_pts;
1518 cluster_time = pkt->pts - mkv->cluster_pts;
1520 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1521 // after 4k and on a keyframe
1522 if (s->pb->seekable) {
1524 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1527 cluster_size = avio_tell(pb);
1530 if (mkv->cluster_pos != -1 &&
1531 (cluster_size > mkv->cluster_size_limit ||
1532 cluster_time > mkv->cluster_time_limit ||
1533 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1534 cluster_size > 4 * 1024))) {
1535 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1536 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1537 avio_tell(pb), pkt->pts, pkt->dts);
1538 end_ebml_master(pb, mkv->cluster);
1539 mkv->cluster_pos = -1;
1541 mkv_flush_dynbuf(s);
1545 // check if we have an audio packet cached
1546 if (mkv->cur_audio_pkt.size > 0) {
1547 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1548 av_free_packet(&mkv->cur_audio_pkt);
1550 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1555 // buffer an audio packet to ensure the packet containing the video
1556 // keyframe's timecode is contained in the same cluster for WebM
1557 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1558 mkv->cur_audio_pkt = *pkt;
1560 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1561 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1563 ret = av_dup_packet(&mkv->cur_audio_pkt);
1565 ret = mkv_write_packet_internal(s, pkt);
1569 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1571 MatroskaMuxContext *mkv = s->priv_data;
1573 if (s->pb->seekable)
1578 if (mkv->cluster_pos != -1) {
1579 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1580 " bytes\n", avio_tell(pb));
1581 end_ebml_master(pb, mkv->cluster);
1582 mkv->cluster_pos = -1;
1584 mkv_flush_dynbuf(s);
1589 return mkv_write_packet(s, pkt);
1592 static int mkv_write_trailer(AVFormatContext *s)
1594 MatroskaMuxContext *mkv = s->priv_data;
1595 AVIOContext *pb = s->pb;
1596 int64_t currentpos, cuespos;
1599 // check if we have an audio packet cached
1600 if (mkv->cur_audio_pkt.size > 0) {
1601 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1602 av_free_packet(&mkv->cur_audio_pkt);
1604 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1610 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1611 mkv_flush_dynbuf(s);
1612 } else if (mkv->cluster_pos != -1) {
1613 end_ebml_master(pb, mkv->cluster);
1616 if (mkv->mode != MODE_WEBM) {
1617 ret = mkv_write_chapters(s);
1618 if (ret < 0) return ret;
1622 if (mkv->cues->num_entries) {
1623 if (mkv->reserve_cues_space) {
1626 currentpos = avio_tell(pb);
1627 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1629 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1630 cues_end = avio_tell(pb);
1631 if (cues_end > cuespos + mkv->reserve_cues_space) {
1632 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1633 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1634 cues_end - cuespos);
1635 return AVERROR(EINVAL);
1638 if (cues_end < cuespos + mkv->reserve_cues_space)
1639 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1641 avio_seek(pb, currentpos, SEEK_SET);
1643 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1646 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1647 if (ret < 0) return ret;
1650 mkv_write_seekhead(pb, mkv->main_seekhead);
1652 // update the duration
1653 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1654 currentpos = avio_tell(pb);
1655 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1656 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1658 avio_seek(pb, currentpos, SEEK_SET);
1661 end_ebml_master(pb, mkv->segment);
1662 av_free(mkv->tracks);
1663 av_freep(&mkv->cues->entries);
1664 av_freep(&mkv->cues);
1669 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1672 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1673 if (ff_mkv_codec_tags[i].id == codec_id)
1676 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1677 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1678 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1685 static const AVCodecTag additional_audio_tags[] = {
1686 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1687 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1688 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1689 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1690 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1691 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1692 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1693 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1694 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1695 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1696 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1697 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1698 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1701 static const AVCodecTag additional_video_tags[] = {
1702 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1703 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1704 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1705 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1706 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1707 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1710 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1711 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1712 static const AVOption options[] = {
1713 { "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 },
1714 { "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 },
1715 { "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 },
1719 #if CONFIG_MATROSKA_MUXER
1720 static const AVClass matroska_class = {
1721 .class_name = "matroska muxer",
1722 .item_name = av_default_item_name,
1724 .version = LIBAVUTIL_VERSION_INT,
1727 AVOutputFormat ff_matroska_muxer = {
1729 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1730 .mime_type = "video/x-matroska",
1731 .extensions = "mkv",
1732 .priv_data_size = sizeof(MatroskaMuxContext),
1733 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1734 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1735 .video_codec = CONFIG_LIBX264_ENCODER ?
1736 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1737 .write_header = mkv_write_header,
1738 .write_packet = mkv_write_flush_packet,
1739 .write_trailer = mkv_write_trailer,
1740 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1741 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1742 .codec_tag = (const AVCodecTag* const []){
1743 ff_codec_bmp_tags, ff_codec_wav_tags,
1744 additional_audio_tags, additional_video_tags, 0
1747 .subtitle_codec = AV_CODEC_ID_SSA,
1749 .subtitle_codec = AV_CODEC_ID_ASS,
1751 .query_codec = mkv_query_codec,
1752 .priv_class = &matroska_class,
1756 #if CONFIG_WEBM_MUXER
1757 static const AVClass webm_class = {
1758 .class_name = "webm muxer",
1759 .item_name = av_default_item_name,
1761 .version = LIBAVUTIL_VERSION_INT,
1764 AVOutputFormat ff_webm_muxer = {
1766 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1767 .mime_type = "video/webm",
1768 .extensions = "webm",
1769 .priv_data_size = sizeof(MatroskaMuxContext),
1770 .audio_codec = AV_CODEC_ID_VORBIS,
1771 .video_codec = AV_CODEC_ID_VP8,
1772 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1773 .write_header = mkv_write_header,
1774 .write_packet = mkv_write_flush_packet,
1775 .write_trailer = mkv_write_trailer,
1776 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1777 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1778 .priv_class = &webm_class,
1782 #if CONFIG_MATROSKA_AUDIO_MUXER
1783 static const AVClass mka_class = {
1784 .class_name = "matroska audio muxer",
1785 .item_name = av_default_item_name,
1787 .version = LIBAVUTIL_VERSION_INT,
1789 AVOutputFormat ff_matroska_audio_muxer = {
1791 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1792 .mime_type = "audio/x-matroska",
1793 .extensions = "mka",
1794 .priv_data_size = sizeof(MatroskaMuxContext),
1795 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1796 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1797 .video_codec = AV_CODEC_ID_NONE,
1798 .write_header = mkv_write_header,
1799 .write_packet = mkv_write_flush_packet,
1800 .write_trailer = mkv_write_trailer,
1801 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1803 .codec_tag = (const AVCodecTag* const []){
1804 ff_codec_wav_tags, additional_audio_tags, 0
1806 .priv_class = &mka_class,