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
28 #include "avlanguage.h"
29 #include "libavutil/samplefmt.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/random_seed.h"
32 #include "libavutil/lfg.h"
33 #include "libavutil/dict.h"
34 #include "libavcodec/xiph.h"
35 #include "libavcodec/mpeg4audio.h"
38 typedef struct ebml_master {
39 int64_t pos; ///< absolute offset in the file where the master's elements start
40 int sizebytes; ///< how many bytes were reserved for the size
43 typedef struct mkv_seekhead_entry {
44 unsigned int elementid;
48 typedef struct mkv_seekhead {
50 int64_t segment_offset; ///< the file offset to the beginning of the segment
51 int reserved_size; ///< -1 if appending to file
53 mkv_seekhead_entry *entries;
60 int64_t cluster_pos; ///< file offset of the cluster containing the block
64 int64_t segment_offset;
65 mkv_cuepoint *entries;
73 #define MODE_MATROSKAv2 0x01
74 #define MODE_WEBM 0x02
76 typedef struct MatroskaMuxContext {
80 int64_t segment_offset;
82 int64_t cluster_pos; ///< file offset of the current cluster
84 int64_t duration_offset;
86 mkv_seekhead *main_seekhead;
90 unsigned int audio_buffer_size;
91 AVPacket cur_audio_pkt;
95 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
96 * offset, 4 bytes for target EBML ID */
97 #define MAX_SEEKENTRY_SIZE 21
99 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
101 #define MAX_CUETRACKPOS_SIZE 22
103 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
104 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
107 static int ebml_id_size(unsigned int id)
109 return (av_log2(id+1)-1)/7+1;
112 static void put_ebml_id(AVIOContext *pb, unsigned int id)
114 int i = ebml_id_size(id);
116 avio_w8(pb, id >> (i*8));
120 * Write an EBML size meaning "unknown size".
122 * @param bytes The number of bytes the size should occupy (maximum: 8).
124 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
127 avio_w8(pb, 0x1ff >> bytes);
133 * Calculate how many bytes are needed to represent a given number in EBML.
135 static int ebml_num_size(uint64_t num)
138 while ((num+1) >> bytes*7) bytes++;
143 * Write a number in EBML variable length format.
145 * @param bytes The number of bytes that need to be used to write the number.
146 * If zero, any number of bytes can be used.
148 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
150 int i, needed_bytes = ebml_num_size(num);
152 // sizes larger than this are currently undefined in EBML
153 assert(num < (1ULL<<56)-1);
156 // don't care how many bytes are used, so use the min
157 bytes = needed_bytes;
158 // the bytes needed to write the given size would exceed the bytes
159 // that we need to use, so write unknown size. This shouldn't happen.
160 assert(bytes >= needed_bytes);
162 num |= 1ULL << bytes*7;
163 for (i = bytes - 1; i >= 0; i--)
164 avio_w8(pb, num >> i*8);
167 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
171 while (tmp>>=8) bytes++;
173 put_ebml_id(pb, elementid);
174 put_ebml_num(pb, bytes, 0);
175 for (i = bytes - 1; i >= 0; i--)
176 avio_w8(pb, val >> i*8);
179 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
181 put_ebml_id(pb, elementid);
182 put_ebml_num(pb, 8, 0);
183 avio_wb64(pb, av_dbl2int(val));
186 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
187 const void *buf, int size)
189 put_ebml_id(pb, elementid);
190 put_ebml_num(pb, size, 0);
191 avio_write(pb, buf, size);
194 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
196 put_ebml_binary(pb, elementid, str, strlen(str));
200 * Write a void element of a given size. Useful for reserving space in
201 * the file to be written to later.
203 * @param size The number of bytes to reserve, which must be at least 2.
205 static void put_ebml_void(AVIOContext *pb, uint64_t size)
207 int64_t currentpos = avio_tell(pb);
211 put_ebml_id(pb, EBML_ID_VOID);
212 // we need to subtract the length needed to store the size from the
213 // size we need to reserve so 2 cases, we use 8 bytes to store the
214 // size if possible, 1 byte otherwise
216 put_ebml_num(pb, size-1, 0);
218 put_ebml_num(pb, size-9, 8);
219 while(avio_tell(pb) < currentpos + size)
223 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
225 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
226 put_ebml_id(pb, elementid);
227 put_ebml_size_unknown(pb, bytes);
228 return (ebml_master){ avio_tell(pb), bytes };
231 static void end_ebml_master(AVIOContext *pb, ebml_master master)
233 int64_t pos = avio_tell(pb);
235 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
237 put_ebml_num(pb, pos - master.pos, master.sizebytes);
238 avio_seek(pb, pos, SEEK_SET);
241 static void put_xiph_size(AVIOContext *pb, int size)
244 for (i = 0; i < size / 255; i++)
246 avio_w8(pb, size % 255);
250 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
251 * elements. If a maximum number of elements is specified, enough space
252 * will be reserved at the current file location to write a seek head of
255 * @param segment_offset The absolute offset to the position in the file
256 * where the segment begins.
257 * @param numelements The maximum number of elements that will be indexed
258 * by this seek head, 0 if unlimited.
260 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
262 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
263 if (new_seekhead == NULL)
266 new_seekhead->segment_offset = segment_offset;
268 if (numelements > 0) {
269 new_seekhead->filepos = avio_tell(pb);
270 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
271 // and size, and 3 bytes to guarantee that an EBML void element
272 // will fit afterwards
273 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
274 new_seekhead->max_entries = numelements;
275 put_ebml_void(pb, new_seekhead->reserved_size);
280 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
282 mkv_seekhead_entry *entries = seekhead->entries;
284 // don't store more elements than we reserved space for
285 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
288 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
290 return AVERROR(ENOMEM);
292 entries[seekhead->num_entries ].elementid = elementid;
293 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
295 seekhead->entries = entries;
300 * Write the seek head to the file and free it. If a maximum number of
301 * elements was specified to mkv_start_seekhead(), the seek head will
302 * be written at the location reserved for it. Otherwise, it is written
303 * at the current location in the file.
305 * @return The file offset where the seekhead was written,
306 * -1 if an error occurred.
308 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
310 ebml_master metaseek, seekentry;
314 currentpos = avio_tell(pb);
316 if (seekhead->reserved_size > 0)
317 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0)
320 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
321 for (i = 0; i < seekhead->num_entries; i++) {
322 mkv_seekhead_entry *entry = &seekhead->entries[i];
324 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
326 put_ebml_id(pb, MATROSKA_ID_SEEKID);
327 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
328 put_ebml_id(pb, entry->elementid);
330 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
331 end_ebml_master(pb, seekentry);
333 end_ebml_master(pb, metaseek);
335 if (seekhead->reserved_size > 0) {
336 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
337 put_ebml_void(pb, remaining);
338 avio_seek(pb, currentpos, SEEK_SET);
340 currentpos = seekhead->filepos;
342 av_free(seekhead->entries);
348 static mkv_cues * mkv_start_cues(int64_t segment_offset)
350 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
354 cues->segment_offset = segment_offset;
358 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
360 mkv_cuepoint *entries = cues->entries;
362 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
364 return AVERROR(ENOMEM);
369 entries[cues->num_entries ].pts = ts;
370 entries[cues->num_entries ].tracknum = stream + 1;
371 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
373 cues->entries = entries;
377 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
379 ebml_master cues_element;
383 currentpos = avio_tell(pb);
384 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
386 for (i = 0; i < cues->num_entries; i++) {
387 ebml_master cuepoint, track_positions;
388 mkv_cuepoint *entry = &cues->entries[i];
389 uint64_t pts = entry->pts;
391 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
392 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
394 // put all the entries from different tracks that have the exact same
395 // timestamp into the same CuePoint
396 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
397 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
398 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
399 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
400 end_ebml_master(pb, track_positions);
403 end_ebml_master(pb, cuepoint);
405 end_ebml_master(pb, cues_element);
410 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
412 uint8_t *header_start[3];
414 int first_header_size;
417 if (codec->codec_id == CODEC_ID_VORBIS)
418 first_header_size = 30;
420 first_header_size = 42;
422 if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
423 first_header_size, header_start, header_len) < 0) {
424 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
428 avio_w8(pb, 2); // number packets - 1
429 for (j = 0; j < 2; j++) {
430 put_xiph_size(pb, header_len[j]);
432 for (j = 0; j < 3; j++)
433 avio_write(pb, header_start[j], header_len[j]);
438 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
440 MPEG4AudioConfig mp4ac;
442 if (ff_mpeg4audio_get_config(&mp4ac, codec->extradata, codec->extradata_size) < 0) {
443 av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
447 *sample_rate = mp4ac.sample_rate;
448 *output_sample_rate = mp4ac.ext_sample_rate;
451 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
455 int ret, codecpriv_size;
457 ret = avio_open_dyn_buf(&dyn_cp);
462 if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA)
463 ret = put_xiph_codecpriv(s, dyn_cp, codec);
464 else if (codec->codec_id == CODEC_ID_FLAC)
465 ret = ff_flac_write_header(dyn_cp, codec, 1);
466 else if (codec->codec_id == CODEC_ID_H264)
467 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
468 else if (codec->extradata_size)
469 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
470 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
472 if (!codec->codec_tag)
473 codec->codec_tag = ff_codec_get_tag(codec_movvideo_tags, codec->codec_id);
474 if (codec->extradata_size)
475 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
477 if (!codec->codec_tag)
478 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
479 if (!codec->codec_tag) {
480 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
484 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
487 } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
489 tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
491 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
494 if (!codec->codec_tag)
495 codec->codec_tag = tag;
497 ff_put_wav_header(dyn_cp, codec);
500 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
502 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
507 static int mkv_write_tracks(AVFormatContext *s)
509 MatroskaMuxContext *mkv = s->priv_data;
510 AVIOContext *pb = s->pb;
514 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
515 if (ret < 0) return ret;
517 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
518 for (i = 0; i < s->nb_streams; i++) {
519 AVStream *st = s->streams[i];
520 AVCodecContext *codec = st->codec;
521 ebml_master subinfo, track;
524 int bit_depth = av_get_bits_per_sample(codec->codec_id);
525 int sample_rate = codec->sample_rate;
526 int output_sample_rate = 0;
527 AVDictionaryEntry *tag;
530 bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
532 if (codec->codec_id == CODEC_ID_AAC)
533 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
535 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
536 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
537 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
538 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
540 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
541 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
542 tag = av_dict_get(st->metadata, "language", NULL, 0);
543 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
546 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
548 // look for a codec ID string specific to mkv to use,
549 // if none are found, use AVI codes
550 for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
551 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
552 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
558 if (mkv->mode == MODE_WEBM && !(codec->codec_id == CODEC_ID_VP8 ||
559 codec->codec_id == CODEC_ID_VORBIS)) {
560 av_log(s, AV_LOG_ERROR,
561 "Only VP8 video and Vorbis audio are supported for WebM.\n");
562 return AVERROR(EINVAL);
565 switch (codec->codec_type) {
566 case AVMEDIA_TYPE_VIDEO:
567 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
568 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
571 ff_codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
572 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
573 || codec->codec_id == CODEC_ID_SVQ1
574 || codec->codec_id == CODEC_ID_SVQ3
575 || codec->codec_id == CODEC_ID_CINEPAK))
579 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
580 else if (!native_id) {
581 // if there is no mkv-specific codec ID, use VFW mode
582 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
583 mkv->tracks[i].write_dts = 1;
586 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
587 // XXX: interlace flag?
588 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
589 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
591 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
592 (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
593 // save stereo mode flag
594 uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
596 for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
597 if (!strcmp(tag->value, matroska_video_stereo_mode[j])){
602 if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
603 || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
604 av_log(s, AV_LOG_ERROR,
605 "The specified stereo mode is not valid.\n");
606 return AVERROR(EINVAL);
608 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
611 if (st->sample_aspect_ratio.num) {
612 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
613 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
614 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
615 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
618 if (codec->codec_id == CODEC_ID_RAWVIDEO) {
619 uint32_t color_space = av_le2ne32(codec->codec_tag);
620 put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
622 end_ebml_master(pb, subinfo);
625 case AVMEDIA_TYPE_AUDIO:
626 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
629 // no mkv-specific ID, use ACM mode
630 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
632 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
633 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
634 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
635 if (output_sample_rate)
636 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
638 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
639 end_ebml_master(pb, subinfo);
642 case AVMEDIA_TYPE_SUBTITLE:
643 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
645 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
646 return AVERROR(ENOSYS);
650 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
653 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
654 if (ret < 0) return ret;
656 end_ebml_master(pb, track);
658 // ms precision is the de-facto standard timescale for mkv files
659 av_set_pts_info(st, 64, 1, 1000);
661 end_ebml_master(pb, tracks);
665 static int mkv_write_chapters(AVFormatContext *s)
667 MatroskaMuxContext *mkv = s->priv_data;
668 AVIOContext *pb = s->pb;
669 ebml_master chapters, editionentry;
670 AVRational scale = {1, 1E9};
676 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
677 if (ret < 0) return ret;
679 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
680 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
681 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
682 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
683 for (i = 0; i < s->nb_chapters; i++) {
684 ebml_master chapteratom, chapterdisplay;
685 AVChapter *c = s->chapters[i];
686 AVDictionaryEntry *t = NULL;
688 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
689 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
690 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
691 av_rescale_q(c->start, c->time_base, scale));
692 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
693 av_rescale_q(c->end, c->time_base, scale));
694 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
695 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
696 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
697 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
698 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
699 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
700 end_ebml_master(pb, chapterdisplay);
702 end_ebml_master(pb, chapteratom);
704 end_ebml_master(pb, editionentry);
705 end_ebml_master(pb, chapters);
709 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
711 uint8_t *key = av_strdup(t->key);
713 const uint8_t *lang = NULL;
716 if ((p = strrchr(p, '-')) &&
717 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
724 else if (*p >= 'a' && *p <= 'z')
729 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
730 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
732 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
733 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
734 end_ebml_master(pb, tag);
739 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
740 unsigned int uid, ebml_master *tags)
742 MatroskaMuxContext *mkv = s->priv_data;
743 ebml_master tag, targets;
744 AVDictionaryEntry *t = NULL;
748 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
749 if (ret < 0) return ret;
751 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
754 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
755 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
757 put_ebml_uint(s->pb, elementid, uid);
758 end_ebml_master(s->pb, targets);
760 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
761 if (strcasecmp(t->key, "title") && strcasecmp(t->key, "stereo_mode"))
762 mkv_write_simpletag(s->pb, t);
764 end_ebml_master(s->pb, tag);
768 static int mkv_write_tags(AVFormatContext *s)
770 ebml_master tags = {0};
773 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
775 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
776 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
777 if (ret < 0) return ret;
780 for (i = 0; i < s->nb_streams; i++) {
781 AVStream *st = s->streams[i];
783 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
786 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
787 if (ret < 0) return ret;
790 for (i = 0; i < s->nb_chapters; i++) {
791 AVChapter *ch = s->chapters[i];
793 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
796 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
797 if (ret < 0) return ret;
801 end_ebml_master(s->pb, tags);
805 static int mkv_write_header(AVFormatContext *s)
807 MatroskaMuxContext *mkv = s->priv_data;
808 AVIOContext *pb = s->pb;
809 ebml_master ebml_header, segment_info;
810 AVDictionaryEntry *tag;
813 if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
814 else mkv->mode = MODE_MATROSKAv2;
816 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
818 return AVERROR(ENOMEM);
820 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
821 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
822 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
823 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
824 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
825 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
826 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
827 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
828 end_ebml_master(pb, ebml_header);
830 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
831 mkv->segment_offset = avio_tell(pb);
833 // we write 2 seek heads - one at the end of the file to point to each
834 // cluster, and one at the beginning to point to all other level one
835 // elements (including the seek head at the end of the file), which
836 // isn't more than 10 elements if we only write one of each other
837 // currently defined level 1 element
838 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
839 if (!mkv->main_seekhead)
840 return AVERROR(ENOMEM);
842 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
843 if (ret < 0) return ret;
845 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
846 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
847 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
848 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
849 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
850 uint32_t segment_uid[4];
853 av_lfg_init(&lfg, av_get_random_seed());
855 for (i = 0; i < 4; i++)
856 segment_uid[i] = av_lfg_get(&lfg);
858 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
859 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
860 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
863 // reserve space for the duration
865 mkv->duration_offset = avio_tell(pb);
866 put_ebml_void(pb, 11); // assumes double-precision float to be written
867 end_ebml_master(pb, segment_info);
869 ret = mkv_write_tracks(s);
870 if (ret < 0) return ret;
872 if (mkv->mode != MODE_WEBM) {
873 ret = mkv_write_chapters(s);
874 if (ret < 0) return ret;
876 ret = mkv_write_tags(s);
877 if (ret < 0) return ret;
880 if (!s->pb->seekable)
881 mkv_write_seekhead(pb, mkv->main_seekhead);
883 mkv->cues = mkv_start_cues(mkv->segment_offset);
884 if (mkv->cues == NULL)
885 return AVERROR(ENOMEM);
887 av_init_packet(&mkv->cur_audio_pkt);
888 mkv->cur_audio_pkt.size = 0;
889 mkv->audio_buffer_size = 0;
895 static int mkv_blockgroup_size(int pkt_size)
897 int size = pkt_size + 4;
898 size += ebml_num_size(size);
899 size += 2; // EBML ID for block and block duration
900 size += 8; // max size of block duration
901 size += ebml_num_size(size);
902 size += 1; // blockgroup EBML ID
906 static int ass_get_duration(const uint8_t *p)
908 int sh, sm, ss, sc, eh, em, es, ec;
911 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
912 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
914 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
915 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
919 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
921 MatroskaMuxContext *mkv = s->priv_data;
922 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
923 uint8_t *start, *end, *data = pkt->data;
924 ebml_master blockgroup;
928 int duration = ass_get_duration(data);
929 max_duration = FFMAX(duration, max_duration);
930 end = memchr(data, '\n', data_size);
931 size = line_size = end ? end-data+1 : data_size;
932 size -= end ? (end[-1]=='\r')+1 : 0;
934 for (i=0; i<3; i++, start++)
935 if (!(start = memchr(start, ',', size-(start-data))))
937 size -= start - data;
938 sscanf(data, "Dialogue: %d,", &layer);
939 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
940 s->streams[pkt->stream_index]->nb_frames++, layer);
941 size = FFMIN(i+size, sizeof(buffer));
942 memcpy(buffer+i, start, size-i);
944 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
945 "pts %" PRId64 ", duration %d\n",
946 avio_tell(pb), size, pkt->pts, duration);
947 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
948 put_ebml_id(pb, MATROSKA_ID_BLOCK);
949 put_ebml_num(pb, size+4, 0);
950 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
951 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
953 avio_write(pb, buffer, size);
954 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
955 end_ebml_master(pb, blockgroup);
958 data_size -= line_size;
964 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
965 unsigned int blockid, AVPacket *pkt, int flags)
967 MatroskaMuxContext *mkv = s->priv_data;
968 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
969 uint8_t *data = NULL;
970 int size = pkt->size;
971 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
973 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
974 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
975 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
976 if (codec->codec_id == CODEC_ID_H264 && codec->extradata_size > 0 &&
977 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
978 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
981 put_ebml_id(pb, blockid);
982 put_ebml_num(pb, size+4, 0);
983 avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
984 avio_wb16(pb, ts - mkv->cluster_pts);
986 avio_write(pb, data, size);
987 if (data != pkt->data)
991 static int srt_get_duration(uint8_t **buf)
995 for (i=0; i<2 && !duration; i++) {
996 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
997 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
998 &s_hour, &s_min, &s_sec, &s_hsec,
999 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1000 s_min += 60*s_hour; e_min += 60*e_hour;
1001 s_sec += 60*s_min; e_sec += 60*e_min;
1002 s_hsec += 1000*s_sec; e_hsec += 1000*e_sec;
1003 duration = e_hsec - s_hsec;
1005 *buf += strcspn(*buf, "\n") + 1;
1010 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1012 ebml_master blockgroup;
1013 AVPacket pkt2 = *pkt;
1014 int64_t duration = srt_get_duration(&pkt2.data);
1015 pkt2.size -= pkt2.data - pkt->data;
1017 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1018 mkv_blockgroup_size(pkt2.size));
1019 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1020 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1021 end_ebml_master(pb, blockgroup);
1026 static void mkv_flush_dynbuf(AVFormatContext *s)
1028 MatroskaMuxContext *mkv = s->priv_data;
1035 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1036 avio_write(s->pb, dyn_buf, bufsize);
1041 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1043 MatroskaMuxContext *mkv = s->priv_data;
1044 AVIOContext *pb = s->pb;
1045 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1046 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1047 int duration = pkt->duration;
1049 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1051 if (ts == AV_NOPTS_VALUE) {
1052 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1053 return AVERROR(EINVAL);
1056 if (!s->pb->seekable) {
1058 avio_open_dyn_buf(&mkv->dyn_bc);
1062 if (!mkv->cluster_pos) {
1063 mkv->cluster_pos = avio_tell(s->pb);
1064 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1065 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1066 mkv->cluster_pts = FFMAX(0, ts);
1069 if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1070 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1071 } else if (codec->codec_id == CODEC_ID_SSA) {
1072 duration = mkv_write_ass_blocks(s, pb, pkt);
1073 } else if (codec->codec_id == CODEC_ID_SRT) {
1074 duration = mkv_write_srt_blocks(s, pb, pkt);
1076 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
1077 duration = pkt->convergence_duration;
1078 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1079 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1080 end_ebml_master(pb, blockgroup);
1083 if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1084 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
1085 if (ret < 0) return ret;
1088 mkv->duration = FFMAX(mkv->duration, ts + duration);
1092 static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
1094 uint8_t *data = mkv->cur_audio_pkt.data;
1095 mkv->cur_audio_pkt = *pkt;
1096 mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
1097 if (!mkv->cur_audio_pkt.data)
1098 return AVERROR(ENOMEM);
1100 memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
1101 mkv->cur_audio_pkt.size = pkt->size;
1105 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1107 MatroskaMuxContext *mkv = s->priv_data;
1108 AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
1109 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
1110 int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1111 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1112 int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
1114 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1115 // after 4k and on a keyframe
1116 if (mkv->cluster_pos &&
1117 ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
1118 || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
1119 || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
1120 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
1121 " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
1122 end_ebml_master(pb, mkv->cluster);
1123 mkv->cluster_pos = 0;
1125 mkv_flush_dynbuf(s);
1128 // check if we have an audio packet cached
1129 if (mkv->cur_audio_pkt.size > 0) {
1130 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1131 mkv->cur_audio_pkt.size = 0;
1133 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1138 // buffer an audio packet to ensure the packet containing the video
1139 // keyframe's timecode is contained in the same cluster for WebM
1140 if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
1141 ret = mkv_copy_packet(mkv, pkt);
1143 ret = mkv_write_packet_internal(s, pkt);
1147 static int mkv_write_trailer(AVFormatContext *s)
1149 MatroskaMuxContext *mkv = s->priv_data;
1150 AVIOContext *pb = s->pb;
1151 int64_t currentpos, cuespos;
1154 // check if we have an audio packet cached
1155 if (mkv->cur_audio_pkt.size > 0) {
1156 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1157 mkv->cur_audio_pkt.size = 0;
1159 av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
1165 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1166 mkv_flush_dynbuf(s);
1167 } else if (mkv->cluster_pos) {
1168 end_ebml_master(pb, mkv->cluster);
1172 if (mkv->cues->num_entries) {
1173 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1175 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
1176 if (ret < 0) return ret;
1179 mkv_write_seekhead(pb, mkv->main_seekhead);
1181 // update the duration
1182 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1183 currentpos = avio_tell(pb);
1184 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1185 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1187 avio_seek(pb, currentpos, SEEK_SET);
1190 end_ebml_master(pb, mkv->segment);
1191 av_free(mkv->tracks);
1192 av_freep(&mkv->cues->entries);
1193 av_freep(&mkv->cues);
1194 av_destruct_packet(&mkv->cur_audio_pkt);
1199 #if CONFIG_MATROSKA_MUXER
1200 AVOutputFormat ff_matroska_muxer = {
1202 NULL_IF_CONFIG_SMALL("Matroska file format"),
1205 sizeof(MatroskaMuxContext),
1211 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
1212 .codec_tag = (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
1213 .subtitle_codec = CODEC_ID_TEXT,
1217 #if CONFIG_WEBM_MUXER
1218 AVOutputFormat ff_webm_muxer = {
1220 NULL_IF_CONFIG_SMALL("WebM file format"),
1223 sizeof(MatroskaMuxContext),
1229 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
1233 #if CONFIG_MATROSKA_AUDIO_MUXER
1234 AVOutputFormat ff_matroska_audio_muxer = {
1236 NULL_IF_CONFIG_SMALL("Matroska file format"),
1239 sizeof(MatroskaMuxContext),
1245 .flags = AVFMT_GLOBALHEADER,
1246 .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},