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;
112 } MatroskaMuxContext;
115 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
116 * offset, 4 bytes for target EBML ID */
117 #define MAX_SEEKENTRY_SIZE 21
119 /** per-cuepoint-track - 4 1-byte EBML IDs, 4 1-byte EBML sizes, 3
121 #define MAX_CUETRACKPOS_SIZE 32
123 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
124 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
126 /** Seek preroll value for opus */
127 #define OPUS_SEEK_PREROLL 80000000
130 static int ebml_id_size(unsigned int id)
132 return (av_log2(id+1)-1)/7+1;
135 static void put_ebml_id(AVIOContext *pb, unsigned int id)
137 int i = ebml_id_size(id);
139 avio_w8(pb, (uint8_t)(id >> (i*8)));
143 * Write an EBML size meaning "unknown size".
145 * @param bytes The number of bytes the size should occupy (maximum: 8).
147 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
149 av_assert0(bytes <= 8);
150 avio_w8(pb, 0x1ff >> bytes);
151 ffio_fill(pb, 0xff, bytes - 1);
155 * Calculate how many bytes are needed to represent a given number in EBML.
157 static int ebml_num_size(uint64_t num)
160 while ((num+1) >> bytes*7) bytes++;
165 * Write a number in EBML variable length format.
167 * @param bytes The number of bytes that need to be used to write the number.
168 * If zero, any number of bytes can be used.
170 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
172 int i, needed_bytes = ebml_num_size(num);
174 // sizes larger than this are currently undefined in EBML
175 av_assert0(num < (1ULL<<56)-1);
178 // don't care how many bytes are used, so use the min
179 bytes = needed_bytes;
180 // the bytes needed to write the given size would exceed the bytes
181 // that we need to use, so write unknown size. This shouldn't happen.
182 av_assert0(bytes >= needed_bytes);
184 num |= 1ULL << bytes*7;
185 for (i = bytes - 1; i >= 0; i--)
186 avio_w8(pb, (uint8_t)(num >> i*8));
189 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
193 while (tmp>>=8) bytes++;
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, (uint8_t)(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, const char *str)
218 put_ebml_binary(pb, elementid, str, strlen(str));
222 * Write a void element of a given size. Useful for reserving space in
223 * the file to be written to later.
225 * @param size The number of bytes to reserve, which must be at least 2.
227 static void put_ebml_void(AVIOContext *pb, uint64_t size)
229 int64_t currentpos = avio_tell(pb);
231 av_assert0(size >= 2);
233 put_ebml_id(pb, EBML_ID_VOID);
234 // we need to subtract the length needed to store the size from the
235 // size we need to reserve so 2 cases, we use 8 bytes to store the
236 // size if possible, 1 byte otherwise
238 put_ebml_num(pb, size-1, 0);
240 put_ebml_num(pb, size-9, 8);
241 ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
244 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
246 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
247 put_ebml_id(pb, elementid);
248 put_ebml_size_unknown(pb, bytes);
249 return (ebml_master){ avio_tell(pb), bytes };
252 static void end_ebml_master(AVIOContext *pb, ebml_master master)
254 int64_t pos = avio_tell(pb);
256 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
258 put_ebml_num(pb, pos - master.pos, master.sizebytes);
259 avio_seek(pb, pos, SEEK_SET);
262 static void put_xiph_size(AVIOContext *pb, int size)
264 ffio_fill(pb, 255, size / 255);
265 avio_w8(pb, size % 255);
269 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
270 * elements. If a maximum number of elements is specified, enough space
271 * will be reserved at the current file location to write a seek head of
274 * @param segment_offset The absolute offset to the position in the file
275 * where the segment begins.
276 * @param numelements The maximum number of elements that will be indexed
277 * by this seek head, 0 if unlimited.
279 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
281 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
282 if (new_seekhead == NULL)
285 new_seekhead->segment_offset = segment_offset;
287 if (numelements > 0) {
288 new_seekhead->filepos = avio_tell(pb);
289 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
290 // and size, and 3 bytes to guarantee that an EBML void element
291 // will fit afterwards
292 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
293 new_seekhead->max_entries = numelements;
294 put_ebml_void(pb, new_seekhead->reserved_size);
299 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
301 mkv_seekhead_entry *entries = seekhead->entries;
303 // don't store more elements than we reserved space for
304 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
307 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
309 return AVERROR(ENOMEM);
311 entries[seekhead->num_entries ].elementid = elementid;
312 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
314 seekhead->entries = entries;
319 * Write the seek head to the file and free it. If a maximum number of
320 * elements was specified to mkv_start_seekhead(), the seek head will
321 * be written at the location reserved for it. Otherwise, it is written
322 * at the current location in the file.
324 * @return The file offset where the seekhead was written,
325 * -1 if an error occurred.
327 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
329 ebml_master metaseek, seekentry;
333 currentpos = avio_tell(pb);
335 if (seekhead->reserved_size > 0) {
336 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
342 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
343 for (i = 0; i < seekhead->num_entries; i++) {
344 mkv_seekhead_entry *entry = &seekhead->entries[i];
346 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
348 put_ebml_id(pb, MATROSKA_ID_SEEKID);
349 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
350 put_ebml_id(pb, entry->elementid);
352 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
353 end_ebml_master(pb, seekentry);
355 end_ebml_master(pb, metaseek);
357 if (seekhead->reserved_size > 0) {
358 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
359 put_ebml_void(pb, remaining);
360 avio_seek(pb, currentpos, SEEK_SET);
362 currentpos = seekhead->filepos;
365 av_free(seekhead->entries);
371 static mkv_cues * mkv_start_cues(int64_t segment_offset)
373 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
377 cues->segment_offset = segment_offset;
381 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos)
383 mkv_cuepoint *entries = cues->entries;
388 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
390 return AVERROR(ENOMEM);
392 entries[cues->num_entries ].pts = ts;
393 entries[cues->num_entries ].tracknum = stream + 1;
394 entries[cues->num_entries ].cluster_pos = cluster_pos - cues->segment_offset;
395 entries[cues->num_entries++].relative_pos = relative_pos;
397 cues->entries = entries;
401 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)
403 ebml_master cues_element;
407 currentpos = avio_tell(pb);
408 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
410 for (i = 0; i < cues->num_entries; i++) {
411 ebml_master cuepoint, track_positions;
412 mkv_cuepoint *entry = &cues->entries[i];
413 uint64_t pts = entry->pts;
415 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
416 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
418 // put all the entries from different tracks that have the exact same
419 // timestamp into the same CuePoint
420 for (j = 0; j < num_tracks; j++)
421 tracks[j].has_cue = 0;
422 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
423 int tracknum = entry[j].tracknum - 1;
424 av_assert0(tracknum>=0 && tracknum<num_tracks);
425 if (tracks[tracknum].has_cue)
427 tracks[tracknum].has_cue = 1;
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 put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
432 end_ebml_master(pb, track_positions);
435 end_ebml_master(pb, cuepoint);
437 end_ebml_master(pb, cues_element);
442 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
444 uint8_t *header_start[3];
446 int first_header_size;
449 if (codec->codec_id == AV_CODEC_ID_VORBIS)
450 first_header_size = 30;
452 first_header_size = 42;
454 if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,
455 first_header_size, header_start, header_len) < 0) {
456 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
460 avio_w8(pb, 2); // number packets - 1
461 for (j = 0; j < 2; j++) {
462 put_xiph_size(pb, header_len[j]);
464 for (j = 0; j < 3; j++)
465 avio_write(pb, header_start[j], header_len[j]);
470 static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)
472 if (codec->extradata && codec->extradata_size == 2)
473 avio_write(pb, codec->extradata, 2);
475 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
479 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
481 MPEG4AudioConfig mp4ac;
483 if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,
484 codec->extradata_size * 8, 1) < 0) {
485 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
489 *sample_rate = mp4ac.sample_rate;
490 *output_sample_rate = mp4ac.ext_sample_rate;
493 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
497 int ret, codecpriv_size;
499 ret = avio_open_dyn_buf(&dyn_cp);
504 if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)
505 ret = put_xiph_codecpriv(s, dyn_cp, codec);
506 else if (codec->codec_id == AV_CODEC_ID_FLAC)
507 ret = ff_flac_write_header(dyn_cp, codec, 1);
508 else if (codec->codec_id == AV_CODEC_ID_WAVPACK)
509 ret = put_wv_codecpriv(dyn_cp, codec);
510 else if (codec->codec_id == AV_CODEC_ID_H264)
511 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
512 else if (codec->codec_id == AV_CODEC_ID_ALAC) {
513 if (codec->extradata_size < 36) {
514 av_log(s, AV_LOG_ERROR,
515 "Invalid extradata found, ALAC expects a 36-byte "
517 ret = AVERROR_INVALIDDATA;
519 avio_write(dyn_cp, codec->extradata + 12,
520 codec->extradata_size - 12);
522 else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)
523 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
524 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
526 if (!codec->codec_tag)
527 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);
528 if (codec->extradata_size)
529 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
531 if (!codec->codec_tag)
532 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
533 if (!codec->codec_tag) {
534 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
535 avcodec_get_name(codec->codec_id));
536 ret = AVERROR(EINVAL);
539 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
542 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
544 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
546 av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
547 avcodec_get_name(codec->codec_id));
548 ret = AVERROR(EINVAL);
550 if (!codec->codec_tag)
551 codec->codec_tag = tag;
553 ff_put_wav_header(dyn_cp, codec);
556 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
558 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
563 static int mkv_write_tracks(AVFormatContext *s)
565 MatroskaMuxContext *mkv = s->priv_data;
566 AVIOContext *pb = s->pb;
568 int i, j, ret, default_stream_exists = 0;
570 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
571 if (ret < 0) return ret;
573 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
574 for (i = 0; i < s->nb_streams; i++) {
575 AVStream *st = s->streams[i];
576 default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
578 for (i = 0; i < s->nb_streams; i++) {
579 AVStream *st = s->streams[i];
580 AVCodecContext *codec = st->codec;
581 ebml_master subinfo, track;
584 int bit_depth = av_get_bits_per_sample(codec->codec_id);
585 int sample_rate = codec->sample_rate;
586 int output_sample_rate = 0;
587 AVDictionaryEntry *tag;
589 if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
590 mkv->have_attachments = 1;
595 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
597 bit_depth = codec->bits_per_coded_sample;
599 if (codec->codec_id == AV_CODEC_ID_AAC)
600 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
602 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
603 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
604 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
605 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
607 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
608 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
609 tag = av_dict_get(st->metadata, "language", NULL, 0);
610 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
611 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
612 } else if (tag && tag->value) {
613 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
616 // The default value for TRACKFLAGDEFAULT is 1, so add element
617 // if we need to clear it.
618 if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
619 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
621 if (st->disposition & AV_DISPOSITION_FORCED)
622 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
624 if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {
625 const char *codec_id;
626 if (st->disposition & AV_DISPOSITION_CAPTIONS) {
627 codec_id = "D_WEBVTT/CAPTIONS";
628 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
629 } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
630 codec_id = "D_WEBVTT/DESCRIPTIONS";
631 native_id = MATROSKA_TRACK_TYPE_METADATA;
632 } else if (st->disposition & AV_DISPOSITION_METADATA) {
633 codec_id = "D_WEBVTT/METADATA";
634 native_id = MATROSKA_TRACK_TYPE_METADATA;
636 codec_id = "D_WEBVTT/SUBTITLES";
637 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
639 put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
641 // look for a codec ID string specific to mkv to use,
642 // if none are found, use AVI codes
643 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
644 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
645 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
652 if (codec->codec_id == AV_CODEC_ID_OPUS) {
653 put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
656 if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||
657 codec->codec_id == AV_CODEC_ID_VP9 ||
658 ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||
659 codec->codec_id == AV_CODEC_ID_VORBIS ||
660 codec->codec_id == AV_CODEC_ID_WEBVTT)) {
661 av_log(s, AV_LOG_ERROR,
662 "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");
663 return AVERROR(EINVAL);
666 switch (codec->codec_type) {
667 case AVMEDIA_TYPE_VIDEO:
668 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
669 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))
670 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));
672 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
675 ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&
676 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
677 || codec->codec_id == AV_CODEC_ID_SVQ1
678 || codec->codec_id == AV_CODEC_ID_SVQ3
679 || codec->codec_id == AV_CODEC_ID_CINEPAK))
683 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
684 else if (!native_id) {
685 // if there is no mkv-specific codec ID, use VFW mode
686 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
687 mkv->tracks[i].write_dts = 1;
690 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
691 // XXX: interlace flag?
692 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
693 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
695 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
696 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
697 // save stereo mode flag
698 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
700 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
701 if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){
706 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
707 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
708 av_log(s, AV_LOG_ERROR,
709 "The specified stereo mode is not valid.\n");
710 return AVERROR(EINVAL);
712 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
715 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
716 (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
717 (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
718 put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
721 if (st->sample_aspect_ratio.num) {
722 int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
723 if (d_width > INT_MAX) {
724 av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
725 return AVERROR(EINVAL);
727 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
728 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
731 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
732 uint32_t color_space = av_le2ne32(codec->codec_tag);
733 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
735 end_ebml_master(pb, subinfo);
738 case AVMEDIA_TYPE_AUDIO:
739 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
742 // no mkv-specific ID, use ACM mode
743 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
745 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
746 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
747 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
748 if (output_sample_rate)
749 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
751 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
752 end_ebml_master(pb, subinfo);
755 case AVMEDIA_TYPE_SUBTITLE:
757 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
758 return AVERROR(ENOSYS);
761 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)
762 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
764 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
767 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
768 return AVERROR(EINVAL);
771 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {
772 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
773 if (ret < 0) return ret;
776 end_ebml_master(pb, track);
778 // ms precision is the de-facto standard timescale for mkv files
779 avpriv_set_pts_info(st, 64, 1, 1000);
781 end_ebml_master(pb, tracks);
785 static int mkv_write_chapters(AVFormatContext *s)
787 MatroskaMuxContext *mkv = s->priv_data;
788 AVIOContext *pb = s->pb;
789 ebml_master chapters, editionentry;
790 AVRational scale = {1, 1E9};
796 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
797 if (ret < 0) return ret;
799 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
800 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
801 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
802 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
803 for (i = 0; i < s->nb_chapters; i++) {
804 ebml_master chapteratom, chapterdisplay;
805 AVChapter *c = s->chapters[i];
806 AVDictionaryEntry *t = NULL;
808 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
809 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
810 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
811 av_rescale_q(c->start, c->time_base, scale));
812 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
813 av_rescale_q(c->end, c->time_base, scale));
814 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
815 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
816 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
817 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
818 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
819 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
820 end_ebml_master(pb, chapterdisplay);
822 end_ebml_master(pb, chapteratom);
824 end_ebml_master(pb, editionentry);
825 end_ebml_master(pb, chapters);
829 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
831 uint8_t *key = av_strdup(t->key);
833 const uint8_t *lang = NULL;
836 if ((p = strrchr(p, '-')) &&
837 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
844 else if (*p >= 'a' && *p <= 'z')
849 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
850 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
852 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
853 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
854 end_ebml_master(pb, tag);
859 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
860 unsigned int uid, ebml_master *tags)
862 MatroskaMuxContext *mkv = s->priv_data;
863 ebml_master tag, targets;
864 AVDictionaryEntry *t = NULL;
868 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
869 if (ret < 0) return ret;
871 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
874 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
875 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
877 put_ebml_uint(s->pb, elementid, uid);
878 end_ebml_master(s->pb, targets);
880 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
881 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
882 mkv_write_simpletag(s->pb, t);
884 end_ebml_master(s->pb, tag);
888 static int mkv_check_tag(AVDictionary *m)
890 AVDictionaryEntry *t = NULL;
892 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
893 if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))
899 static int mkv_write_tags(AVFormatContext *s)
901 MatroskaMuxContext *mkv = s->priv_data;
902 ebml_master tags = {0};
905 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
907 if (mkv_check_tag(s->metadata)) {
908 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
909 if (ret < 0) return ret;
912 for (i = 0; i < s->nb_streams; i++) {
913 AVStream *st = s->streams[i];
915 if (!mkv_check_tag(st->metadata))
918 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
919 if (ret < 0) return ret;
922 for (i = 0; i < s->nb_chapters; i++) {
923 AVChapter *ch = s->chapters[i];
925 if (!mkv_check_tag(ch->metadata))
928 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);
929 if (ret < 0) return ret;
933 end_ebml_master(s->pb, tags);
937 static int mkv_write_attachments(AVFormatContext *s)
939 MatroskaMuxContext *mkv = s->priv_data;
940 AVIOContext *pb = s->pb;
941 ebml_master attachments;
945 if (!mkv->have_attachments)
948 av_lfg_init(&c, av_get_random_seed());
950 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
951 if (ret < 0) return ret;
953 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
955 for (i = 0; i < s->nb_streams; i++) {
956 AVStream *st = s->streams[i];
957 ebml_master attached_file;
958 AVDictionaryEntry *t;
959 const char *mimetype = NULL;
962 if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)
965 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
967 if (t = av_dict_get(st->metadata, "title", NULL, 0))
968 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
969 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
970 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
971 return AVERROR(EINVAL);
973 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
974 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
976 else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {
978 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
979 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {
980 mimetype = ff_mkv_mime_tags[i].str;
985 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
986 "it cannot be deduced from the codec id.\n", i);
987 return AVERROR(EINVAL);
990 if (st->codec->flags & CODEC_FLAG_BITEXACT) {
991 struct AVSHA *sha = av_sha_alloc();
994 return AVERROR(ENOMEM);
995 av_sha_init(sha, 160);
996 av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);
997 av_sha_final(sha, digest);
999 fileuid = AV_RL64(digest);
1001 fileuid = av_lfg_get(&c);
1003 av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",
1006 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1007 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);
1008 put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);
1009 end_ebml_master(pb, attached_file);
1011 end_ebml_master(pb, attachments);
1016 static int mkv_write_header(AVFormatContext *s)
1018 MatroskaMuxContext *mkv = s->priv_data;
1019 AVIOContext *pb = s->pb;
1020 ebml_master ebml_header, segment_info;
1021 AVDictionaryEntry *tag;
1024 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
1025 else mkv->mode = MODE_MATROSKAv2;
1027 if (s->avoid_negative_ts < 0)
1028 s->avoid_negative_ts = 1;
1030 for (i = 0; i < s->nb_streams; i++)
1031 if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||
1032 s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||
1033 s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||
1034 s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||
1035 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||
1036 s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {
1037 av_log(s, AV_LOG_ERROR,
1038 "The Matroska muxer does not yet support muxing %s\n",
1039 avcodec_get_name(s->streams[i]->codec->codec_id));
1040 return AVERROR_PATCHWELCOME;
1043 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1045 return AVERROR(ENOMEM);
1047 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1048 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1049 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1050 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1051 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1052 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1053 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
1054 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1055 end_ebml_master(pb, ebml_header);
1057 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1058 mkv->segment_offset = avio_tell(pb);
1060 // we write 2 seek heads - one at the end of the file to point to each
1061 // cluster, and one at the beginning to point to all other level one
1062 // elements (including the seek head at the end of the file), which
1063 // isn't more than 10 elements if we only write one of each other
1064 // currently defined level 1 element
1065 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1066 if (!mkv->main_seekhead)
1067 return AVERROR(ENOMEM);
1069 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1070 if (ret < 0) return ret;
1072 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1073 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1074 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1075 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1076 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
1077 uint32_t segment_uid[4];
1080 av_lfg_init(&lfg, av_get_random_seed());
1082 for (i = 0; i < 4; i++)
1083 segment_uid[i] = av_lfg_get(&lfg);
1085 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
1086 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1087 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1090 if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
1091 // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1092 int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;
1093 uint8_t date_utc_buf[8];
1094 AV_WB64(date_utc_buf, date_utc);
1095 put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1098 // reserve space for the duration
1100 mkv->duration_offset = avio_tell(pb);
1101 put_ebml_void(pb, 11); // assumes double-precision float to be written
1102 end_ebml_master(pb, segment_info);
1104 ret = mkv_write_tracks(s);
1105 if (ret < 0) return ret;
1107 for (i = 0; i < s->nb_chapters; i++)
1108 mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1110 if (mkv->mode != MODE_WEBM) {
1111 ret = mkv_write_chapters(s);
1112 if (ret < 0) return ret;
1114 ret = mkv_write_tags(s);
1115 if (ret < 0) return ret;
1117 ret = mkv_write_attachments(s);
1118 if (ret < 0) return ret;
1121 if (!s->pb->seekable)
1122 mkv_write_seekhead(pb, mkv->main_seekhead);
1124 mkv->cues = mkv_start_cues(mkv->segment_offset);
1125 if (mkv->cues == NULL)
1126 return AVERROR(ENOMEM);
1128 if (pb->seekable && mkv->reserve_cues_space) {
1129 mkv->cues_pos = avio_tell(pb);
1130 put_ebml_void(pb, mkv->reserve_cues_space);
1133 av_init_packet(&mkv->cur_audio_pkt);
1134 mkv->cur_audio_pkt.size = 0;
1135 mkv->cluster_pos = -1;
1139 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1140 // after 4k and on a keyframe
1142 if (mkv->cluster_time_limit < 0)
1143 mkv->cluster_time_limit = 5000;
1144 if (mkv->cluster_size_limit < 0)
1145 mkv->cluster_size_limit = 5 * 1024 * 1024;
1147 if (mkv->cluster_time_limit < 0)
1148 mkv->cluster_time_limit = 1000;
1149 if (mkv->cluster_size_limit < 0)
1150 mkv->cluster_size_limit = 32 * 1024;
1156 static int mkv_blockgroup_size(int pkt_size)
1158 int size = pkt_size + 4;
1159 size += ebml_num_size(size);
1160 size += 2; // EBML ID for block and block duration
1161 size += 8; // max size of block duration
1162 size += ebml_num_size(size);
1163 size += 1; // blockgroup EBML ID
1167 static int ass_get_duration(const uint8_t *p)
1169 int sh, sm, ss, sc, eh, em, es, ec;
1170 uint64_t start, end;
1172 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1173 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1175 start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;
1176 end = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;
1181 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1183 MatroskaMuxContext *mkv = s->priv_data;
1184 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1185 uint8_t *start, *end, *data = pkt->data;
1186 ebml_master blockgroup;
1190 int duration = ass_get_duration(data);
1191 max_duration = FFMAX(duration, max_duration);
1192 end = memchr(data, '\n', data_size);
1193 size = line_size = end ? end-data+1 : data_size;
1194 size -= end ? (end[-1]=='\r')+1 : 0;
1196 for (i=0; i<3; i++, start++)
1197 if (!(start = memchr(start, ',', size-(start-data))))
1198 return max_duration;
1199 size -= start - data;
1200 sscanf(data, "Dialogue: %d,", &layer);
1201 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
1202 s->streams[pkt->stream_index]->nb_frames, layer);
1203 size = FFMIN(i+size, sizeof(buffer));
1204 memcpy(buffer+i, start, size-i);
1206 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1207 "pts %" PRId64 ", duration %d\n",
1208 avio_tell(pb), size, pkt->pts, duration);
1209 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1210 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1211 put_ebml_num(pb, size+4, 0);
1212 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1213 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1215 avio_write(pb, buffer, size);
1216 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1217 end_ebml_master(pb, blockgroup);
1220 data_size -= line_size;
1223 return max_duration;
1227 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1234 dst = av_malloc(srclen);
1236 return AVERROR(ENOMEM);
1238 while (srclen >= WV_HEADER_SIZE) {
1241 ret = ff_wv_parse_header(&header, src);
1244 src += WV_HEADER_SIZE;
1245 srclen -= WV_HEADER_SIZE;
1247 if (srclen < header.blocksize) {
1248 ret = AVERROR_INVALIDDATA;
1252 if (header.initial) {
1253 AV_WL32(dst + offset, header.samples);
1256 AV_WL32(dst + offset, header.flags);
1257 AV_WL32(dst + offset + 4, header.crc);
1260 if (!(header.initial && header.final)) {
1261 AV_WL32(dst + offset, header.blocksize);
1265 memcpy(dst + offset, src, header.blocksize);
1266 src += header.blocksize;
1267 srclen -= header.blocksize;
1268 offset += header.blocksize;
1280 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1281 unsigned int blockid, AVPacket *pkt, int flags)
1283 MatroskaMuxContext *mkv = s->priv_data;
1284 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1285 uint8_t *data = NULL, *side_data = NULL;
1286 int offset = 0, size = pkt->size, side_data_size = 0;
1287 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1288 uint64_t additional_id = 0;
1289 ebml_master block_group, block_additions, block_more;
1291 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1292 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1293 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1294 if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&
1295 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
1296 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1297 else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {
1298 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1300 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1306 if (codec->codec_id == AV_CODEC_ID_PRORES) {
1307 /* Matroska specification requires to remove the first QuickTime atom
1313 side_data = av_packet_get_side_data(pkt,
1314 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1317 additional_id = AV_RB64(side_data);
1319 side_data_size -= 8;
1322 if (side_data_size && additional_id == 1) {
1323 block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
1324 blockid = MATROSKA_ID_BLOCK;
1327 put_ebml_id(pb, blockid);
1328 put_ebml_num(pb, size+4, 0);
1329 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1330 avio_wb16(pb, ts - mkv->cluster_pts);
1332 avio_write(pb, data + offset, size);
1333 if (data != pkt->data)
1336 if (side_data_size && additional_id == 1) {
1337 block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
1338 block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
1339 put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
1340 put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
1341 put_ebml_num(pb, side_data_size, 0);
1342 avio_write(pb, side_data, side_data_size);
1343 end_ebml_master(pb, block_more);
1344 end_ebml_master(pb, block_additions);
1345 end_ebml_master(pb, block_group);
1349 static int srt_get_duration(uint8_t **buf)
1351 int i, duration = 0;
1353 for (i=0; i<2 && !duration; i++) {
1354 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1355 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1356 &s_hour, &s_min, &s_sec, &s_hsec,
1357 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1358 s_min += 60*s_hour; e_min += 60*e_hour;
1359 s_sec += 60*s_min; e_sec += 60*e_min;
1360 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1361 duration = e_hsec - s_hsec;
1363 *buf += strcspn(*buf, "\n") + 1;
1368 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1370 ebml_master blockgroup;
1371 AVPacket pkt2 = *pkt;
1372 int64_t duration = srt_get_duration(&pkt2.data);
1373 pkt2.size -= pkt2.data - pkt->data;
1375 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1376 mkv_blockgroup_size(pkt2.size));
1377 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1378 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1379 end_ebml_master(pb, blockgroup);
1384 static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1386 MatroskaMuxContext *mkv = s->priv_data;
1387 ebml_master blockgroup;
1388 int id_size, settings_size, size;
1389 uint8_t *id, *settings;
1390 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1391 const int flags = 0;
1394 id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
1398 settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
1401 size = id_size + 1 + settings_size + 1 + pkt->size;
1403 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1404 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
1405 avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
1407 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
1409 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1410 put_ebml_num(pb, size+4, 0);
1411 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
1412 avio_wb16(pb, ts - mkv->cluster_pts);
1414 avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
1416 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
1417 end_ebml_master(pb, blockgroup);
1419 return pkt->duration;
1422 static void mkv_flush_dynbuf(AVFormatContext *s)
1424 MatroskaMuxContext *mkv = s->priv_data;
1431 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1432 avio_write(s->pb, dyn_buf, bufsize);
1437 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1439 MatroskaMuxContext *mkv = s->priv_data;
1440 AVIOContext *pb = s->pb;
1441 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1442 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1443 int duration = pkt->duration;
1445 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1446 int64_t relative_packet_pos;
1448 if (ts == AV_NOPTS_VALUE) {
1449 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1450 return AVERROR(EINVAL);
1453 if (!s->pb->seekable) {
1455 if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {
1456 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");
1463 if (mkv->cluster_pos == -1) {
1464 mkv->cluster_pos = avio_tell(s->pb);
1465 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1466 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1467 mkv->cluster_pts = FFMAX(0, ts);
1470 relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;
1472 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1473 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1475 } else if (codec->codec_id == AV_CODEC_ID_SSA) {
1476 duration = mkv_write_ass_blocks(s, pb, pkt);
1478 } else if (codec->codec_id == AV_CODEC_ID_SRT) {
1479 duration = mkv_write_srt_blocks(s, pb, pkt);
1480 } else if (codec->codec_id == AV_CODEC_ID_WEBVTT) {
1481 duration = mkv_write_vtt_blocks(s, pb, pkt);
1483 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1484 /* For backward compatibility, prefer convergence_duration. */
1485 if (pkt->convergence_duration > 0) {
1486 duration = pkt->convergence_duration;
1488 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1489 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1490 end_ebml_master(pb, blockgroup);
1493 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1494 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos);
1495 if (ret < 0) return ret;
1498 mkv->duration = FFMAX(mkv->duration, ts + duration);
1502 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1504 MatroskaMuxContext *mkv = s->priv_data;
1505 int codec_type = s->streams[pkt->stream_index]->codec->codec_type;
1506 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1508 int64_t cluster_time;
1512 if (mkv->tracks[pkt->stream_index].write_dts)
1513 cluster_time = pkt->dts - mkv->cluster_pts;
1515 cluster_time = pkt->pts - mkv->cluster_pts;
1517 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1518 // after 4k and on a keyframe
1519 if (s->pb->seekable) {
1521 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1524 cluster_size = avio_tell(pb);
1527 if (mkv->cluster_pos != -1 &&
1528 (cluster_size > mkv->cluster_size_limit ||
1529 cluster_time > mkv->cluster_time_limit ||
1530 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1531 cluster_size > 4 * 1024))) {
1532 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1533 " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",
1534 avio_tell(pb), pkt->pts, pkt->dts);
1535 end_ebml_master(pb, mkv->cluster);
1536 mkv->cluster_pos = -1;
1538 mkv_flush_dynbuf(s);
1542 // check if we have an audio packet cached
1543 if (mkv->cur_audio_pkt.size > 0) {
1544 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1545 av_free_packet(&mkv->cur_audio_pkt);
1547 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1552 // buffer an audio packet to ensure the packet containing the video
1553 // keyframe's timecode is contained in the same cluster for WebM
1554 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1555 mkv->cur_audio_pkt = *pkt;
1557 mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
1558 ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
1560 ret = av_dup_packet(&mkv->cur_audio_pkt);
1562 ret = mkv_write_packet_internal(s, pkt);
1566 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1568 MatroskaMuxContext *mkv = s->priv_data;
1570 if (s->pb->seekable)
1575 if (mkv->cluster_pos != -1) {
1576 av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64
1577 " bytes\n", avio_tell(pb));
1578 end_ebml_master(pb, mkv->cluster);
1579 mkv->cluster_pos = -1;
1581 mkv_flush_dynbuf(s);
1586 return mkv_write_packet(s, pkt);
1589 static int mkv_write_trailer(AVFormatContext *s)
1591 MatroskaMuxContext *mkv = s->priv_data;
1592 AVIOContext *pb = s->pb;
1593 int64_t currentpos, cuespos;
1596 // check if we have an audio packet cached
1597 if (mkv->cur_audio_pkt.size > 0) {
1598 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1599 av_free_packet(&mkv->cur_audio_pkt);
1601 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1607 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1608 mkv_flush_dynbuf(s);
1609 } else if (mkv->cluster_pos != -1) {
1610 end_ebml_master(pb, mkv->cluster);
1614 if (mkv->cues->num_entries) {
1615 if (mkv->reserve_cues_space) {
1618 currentpos = avio_tell(pb);
1619 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1621 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1622 cues_end = avio_tell(pb);
1623 if (cues_end > cuespos + mkv->reserve_cues_space) {
1624 av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "
1625 "(needed: %"PRId64").\n", mkv->reserve_cues_space,
1626 cues_end - cuespos);
1627 return AVERROR(EINVAL);
1630 if (cues_end < cuespos + mkv->reserve_cues_space)
1631 put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));
1633 avio_seek(pb, currentpos, SEEK_SET);
1635 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);
1638 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1639 if (ret < 0) return ret;
1642 mkv_write_seekhead(pb, mkv->main_seekhead);
1644 // update the duration
1645 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1646 currentpos = avio_tell(pb);
1647 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1648 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1650 avio_seek(pb, currentpos, SEEK_SET);
1653 end_ebml_master(pb, mkv->segment);
1654 av_free(mkv->tracks);
1655 av_freep(&mkv->cues->entries);
1656 av_freep(&mkv->cues);
1661 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1664 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1665 if (ff_mkv_codec_tags[i].id == codec_id)
1668 if (std_compliance < FF_COMPLIANCE_NORMAL) { // mkv theoretically supports any
1669 enum AVMediaType type = avcodec_get_type(codec_id); // video/audio through VFW/ACM
1670 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1677 static const AVCodecTag additional_audio_tags[] = {
1678 { AV_CODEC_ID_ALAC, 0XFFFFFFFF },
1679 { AV_CODEC_ID_EAC3, 0XFFFFFFFF },
1680 { AV_CODEC_ID_MLP, 0xFFFFFFFF },
1681 { AV_CODEC_ID_OPUS, 0xFFFFFFFF },
1682 { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
1683 { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
1684 { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
1685 { AV_CODEC_ID_QDM2, 0xFFFFFFFF },
1686 { AV_CODEC_ID_RA_144, 0xFFFFFFFF },
1687 { AV_CODEC_ID_RA_288, 0xFFFFFFFF },
1688 { AV_CODEC_ID_COOK, 0xFFFFFFFF },
1689 { AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
1690 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1693 static const AVCodecTag additional_video_tags[] = {
1694 { AV_CODEC_ID_PRORES, 0xFFFFFFFF },
1695 { AV_CODEC_ID_RV10, 0xFFFFFFFF },
1696 { AV_CODEC_ID_RV20, 0xFFFFFFFF },
1697 { AV_CODEC_ID_RV30, 0xFFFFFFFF },
1698 { AV_CODEC_ID_RV40, 0xFFFFFFFF },
1699 { AV_CODEC_ID_VP9, 0xFFFFFFFF },
1700 { AV_CODEC_ID_NONE, 0xFFFFFFFF }
1703 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1704 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1705 static const AVOption options[] = {
1706 { "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 },
1707 { "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 },
1708 { "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 },
1712 #if CONFIG_MATROSKA_MUXER
1713 static const AVClass matroska_class = {
1714 .class_name = "matroska muxer",
1715 .item_name = av_default_item_name,
1717 .version = LIBAVUTIL_VERSION_INT,
1720 AVOutputFormat ff_matroska_muxer = {
1722 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1723 .mime_type = "video/x-matroska",
1724 .extensions = "mkv",
1725 .priv_data_size = sizeof(MatroskaMuxContext),
1726 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1727 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1728 .video_codec = CONFIG_LIBX264_ENCODER ?
1729 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1730 .write_header = mkv_write_header,
1731 .write_packet = mkv_write_flush_packet,
1732 .write_trailer = mkv_write_trailer,
1733 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1734 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1735 .codec_tag = (const AVCodecTag* const []){
1736 ff_codec_bmp_tags, ff_codec_wav_tags,
1737 additional_audio_tags, additional_video_tags, 0
1740 .subtitle_codec = AV_CODEC_ID_SSA,
1742 .subtitle_codec = AV_CODEC_ID_ASS,
1744 .query_codec = mkv_query_codec,
1745 .priv_class = &matroska_class,
1749 #if CONFIG_WEBM_MUXER
1750 static const AVClass webm_class = {
1751 .class_name = "webm muxer",
1752 .item_name = av_default_item_name,
1754 .version = LIBAVUTIL_VERSION_INT,
1757 AVOutputFormat ff_webm_muxer = {
1759 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1760 .mime_type = "video/webm",
1761 .extensions = "webm",
1762 .priv_data_size = sizeof(MatroskaMuxContext),
1763 .audio_codec = AV_CODEC_ID_VORBIS,
1764 .video_codec = AV_CODEC_ID_VP8,
1765 .subtitle_codec = AV_CODEC_ID_WEBVTT,
1766 .write_header = mkv_write_header,
1767 .write_packet = mkv_write_flush_packet,
1768 .write_trailer = mkv_write_trailer,
1769 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1770 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1771 .priv_class = &webm_class,
1775 #if CONFIG_MATROSKA_AUDIO_MUXER
1776 static const AVClass mka_class = {
1777 .class_name = "matroska audio muxer",
1778 .item_name = av_default_item_name,
1780 .version = LIBAVUTIL_VERSION_INT,
1782 AVOutputFormat ff_matroska_audio_muxer = {
1784 .long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
1785 .mime_type = "audio/x-matroska",
1786 .extensions = "mka",
1787 .priv_data_size = sizeof(MatroskaMuxContext),
1788 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1789 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1790 .video_codec = AV_CODEC_ID_NONE,
1791 .write_header = mkv_write_header,
1792 .write_packet = mkv_write_flush_packet,
1793 .write_trailer = mkv_write_trailer,
1794 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1796 .codec_tag = (const AVCodecTag* const []){
1797 ff_codec_wav_tags, additional_audio_tags, 0
1799 .priv_class = &mka_class,