3 * Copyright (c) 2007 David Conrad
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "avlanguage.h"
33 #include "vorbiscomment.h"
36 #include "libavutil/avstring.h"
37 #include "libavutil/channel_layout.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lfg.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/random_seed.h"
45 #include "libavutil/samplefmt.h"
46 #include "libavutil/stereo3d.h"
48 #include "libavcodec/xiph.h"
49 #include "libavcodec/mpeg4audio.h"
51 typedef struct ebml_master {
52 int64_t pos; ///< absolute offset in the file where the master's elements start
53 int sizebytes; ///< how many bytes were reserved for the size
56 typedef struct mkv_seekhead_entry {
57 unsigned int elementid;
61 typedef struct mkv_seekhead {
63 int64_t segment_offset; ///< the file offset to the beginning of the segment
64 int reserved_size; ///< -1 if appending to file
66 mkv_seekhead_entry *entries;
70 typedef struct mkv_cuepoint {
73 int64_t cluster_pos; ///< file offset of the cluster containing the block
76 typedef struct mkv_cues {
77 int64_t segment_offset;
78 mkv_cuepoint *entries;
82 typedef struct mkv_track {
85 int64_t sample_rate_offset;
86 int64_t codecpriv_offset;
90 #define MODE_MATROSKAv2 0x01
91 #define MODE_WEBM 0x02
93 typedef struct MatroskaMuxContext {
98 int64_t segment_offset;
100 int64_t cluster_pos; ///< file offset of the current cluster
102 int64_t duration_offset;
104 mkv_seekhead *main_seekhead;
108 AVPacket cur_audio_pkt;
110 int have_attachments;
113 int reserve_cues_space;
114 int cluster_size_limit;
116 int64_t cluster_time_limit;
118 } MatroskaMuxContext;
121 /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
122 * offset, 4 bytes for target EBML ID */
123 #define MAX_SEEKENTRY_SIZE 21
125 /** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
127 #define MAX_CUETRACKPOS_SIZE 22
129 /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
130 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
132 static int ebml_id_size(unsigned int id)
134 return (av_log2(id + 1) - 1) / 7 + 1;
137 static void put_ebml_id(AVIOContext *pb, unsigned int id)
139 int i = ebml_id_size(id);
141 avio_w8(pb, id >> (i * 8));
145 * Write an EBML size meaning "unknown size".
147 * @param bytes The number of bytes the size should occupy (maximum: 8).
149 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
152 avio_w8(pb, 0x1ff >> bytes);
158 * Calculate how many bytes are needed to represent a given number in EBML.
160 static int ebml_num_size(uint64_t num)
163 while ((num + 1) >> bytes * 7)
169 * Write a number in EBML variable length format.
171 * @param bytes The number of bytes that need to be used to write the number.
172 * If zero, any number of bytes can be used.
174 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
176 int i, needed_bytes = ebml_num_size(num);
178 // sizes larger than this are currently undefined in EBML
179 assert(num < (1ULL << 56) - 1);
182 // don't care how many bytes are used, so use the min
183 bytes = needed_bytes;
184 // the bytes needed to write the given size would exceed the bytes
185 // that we need to use, so write unknown size. This shouldn't happen.
186 assert(bytes >= needed_bytes);
188 num |= 1ULL << bytes * 7;
189 for (i = bytes - 1; i >= 0; i--)
190 avio_w8(pb, num >> i * 8);
193 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
200 put_ebml_id(pb, elementid);
201 put_ebml_num(pb, bytes, 0);
202 for (i = bytes - 1; i >= 0; i--)
203 avio_w8(pb, val >> i * 8);
206 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
208 put_ebml_id(pb, elementid);
209 put_ebml_num(pb, 8, 0);
210 avio_wb64(pb, av_double2int(val));
213 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
214 const void *buf, int size)
216 put_ebml_id(pb, elementid);
217 put_ebml_num(pb, size, 0);
218 avio_write(pb, buf, size);
221 static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
224 put_ebml_binary(pb, elementid, str, strlen(str));
228 * Write a void element of a given size. Useful for reserving space in
229 * the file to be written to later.
231 * @param size The number of bytes to reserve, which must be at least 2.
233 static void put_ebml_void(AVIOContext *pb, uint64_t size)
235 int64_t currentpos = avio_tell(pb);
239 put_ebml_id(pb, EBML_ID_VOID);
240 // we need to subtract the length needed to store the size from the
241 // size we need to reserve so 2 cases, we use 8 bytes to store the
242 // size if possible, 1 byte otherwise
244 put_ebml_num(pb, size - 1, 0);
246 put_ebml_num(pb, size - 9, 8);
247 while (avio_tell(pb) < currentpos + size)
251 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
252 uint64_t expectedsize)
254 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
255 put_ebml_id(pb, elementid);
256 put_ebml_size_unknown(pb, bytes);
257 return (ebml_master) {avio_tell(pb), bytes };
260 static void end_ebml_master(AVIOContext *pb, ebml_master master)
262 int64_t pos = avio_tell(pb);
264 if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
266 put_ebml_num(pb, pos - master.pos, master.sizebytes);
267 avio_seek(pb, pos, SEEK_SET);
270 static void put_xiph_size(AVIOContext *pb, int size)
273 for (i = 0; i < size / 255; i++)
275 avio_w8(pb, size % 255);
279 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
280 * elements. If a maximum number of elements is specified, enough space
281 * will be reserved at the current file location to write a seek head of
284 * @param segment_offset The absolute offset to the position in the file
285 * where the segment begins.
286 * @param numelements The maximum number of elements that will be indexed
287 * by this seek head, 0 if unlimited.
289 static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
292 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
296 new_seekhead->segment_offset = segment_offset;
298 if (numelements > 0) {
299 new_seekhead->filepos = avio_tell(pb);
300 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
301 // and size, and 3 bytes to guarantee that an EBML void element
302 // will fit afterwards
303 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
304 new_seekhead->max_entries = numelements;
305 put_ebml_void(pb, new_seekhead->reserved_size);
310 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
314 // don't store more elements than we reserved space for
315 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
318 if ((err = av_reallocp_array(&seekhead->entries, seekhead->num_entries + 1,
319 sizeof(*seekhead->entries))) < 0) {
320 seekhead->num_entries = 0;
324 seekhead->entries[seekhead->num_entries].elementid = elementid;
325 seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
331 * Write the seek head to the file and free it. If a maximum number of
332 * elements was specified to mkv_start_seekhead(), the seek head will
333 * be written at the location reserved for it. Otherwise, it is written
334 * at the current location in the file.
336 * @return The file offset where the seekhead was written,
337 * -1 if an error occurred.
339 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
341 ebml_master metaseek, seekentry;
345 currentpos = avio_tell(pb);
347 if (seekhead->reserved_size > 0) {
348 if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
354 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
355 for (i = 0; i < seekhead->num_entries; i++) {
356 mkv_seekhead_entry *entry = &seekhead->entries[i];
358 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
360 put_ebml_id(pb, MATROSKA_ID_SEEKID);
361 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
362 put_ebml_id(pb, entry->elementid);
364 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
365 end_ebml_master(pb, seekentry);
367 end_ebml_master(pb, metaseek);
369 if (seekhead->reserved_size > 0) {
370 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
371 put_ebml_void(pb, remaining);
372 avio_seek(pb, currentpos, SEEK_SET);
374 currentpos = seekhead->filepos;
377 av_free(seekhead->entries);
383 static mkv_cues *mkv_start_cues(int64_t segment_offset)
385 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
389 cues->segment_offset = segment_offset;
393 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
400 if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
401 sizeof(*cues->entries))) < 0) {
402 cues->num_entries = 0;
406 cues->entries[cues->num_entries].pts = ts;
407 cues->entries[cues->num_entries].tracknum = stream + 1;
408 cues->entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
413 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
415 ebml_master cues_element;
419 currentpos = avio_tell(pb);
420 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
422 for (i = 0; i < cues->num_entries; i++) {
423 ebml_master cuepoint, track_positions;
424 mkv_cuepoint *entry = &cues->entries[i];
425 uint64_t pts = entry->pts;
427 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
428 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
430 // put all the entries from different tracks that have the exact same
431 // timestamp into the same CuePoint
432 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
433 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
434 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
435 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
436 end_ebml_master(pb, track_positions);
439 end_ebml_master(pb, cuepoint);
441 end_ebml_master(pb, cues_element);
446 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
448 uint8_t *header_start[3];
450 int first_header_size;
453 if (par->codec_id == AV_CODEC_ID_VORBIS)
454 first_header_size = 30;
456 first_header_size = 42;
458 if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
459 first_header_size, header_start, header_len) < 0) {
460 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
464 avio_w8(pb, 2); // number packets - 1
465 for (j = 0; j < 2; j++) {
466 put_xiph_size(pb, header_len[j]);
468 for (j = 0; j < 3; j++)
469 avio_write(pb, header_start[j], header_len[j]);
474 static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
476 if (par->extradata && par->extradata_size == 2)
477 avio_write(pb, par->extradata, 2);
479 avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
483 static int put_flac_codecpriv(AVFormatContext *s,
484 AVIOContext *pb, AVCodecParameters *par)
486 int write_comment = (par->channel_layout &&
487 !(par->channel_layout & ~0x3ffffULL) &&
488 !ff_flac_is_native_layout(par->channel_layout));
489 int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
496 const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
497 "Libav" : LIBAVFORMAT_IDENT;
498 AVDictionary *dict = NULL;
499 uint8_t buf[32], *data, *p;
502 snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
503 av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
505 len = ff_vorbiscomment_length(dict, vendor);
506 data = av_malloc(len + 4);
509 return AVERROR(ENOMEM);
513 AV_WB24(data + 1, len);
516 ff_vorbiscomment_write(&p, &dict, vendor);
518 avio_write(pb, data, len + 4);
527 static int get_aac_sample_rates(AVFormatContext *s, uint8_t *extradata, int extradata_size,
528 int *sample_rate, int *output_sample_rate)
530 MPEG4AudioConfig mp4ac;
533 ret = avpriv_mpeg4audio_get_config(&mp4ac, extradata,
534 extradata_size * 8, 1);
535 /* Don't abort if the failure is because of missing extradata. Assume in that
536 * case a bitstream filter will provide the muxer with the extradata in the
538 * Abort however if s->pb is not seekable, as we would not be able to seek back
539 * to write the sample rate elements once the extradata shows up, anyway. */
540 if (ret < 0 && (extradata_size || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL))) {
541 av_log(s, AV_LOG_ERROR,
542 "Error parsing AAC extradata, unable to determine samplerate.\n");
543 return AVERROR(EINVAL);
547 /* This will only happen when this function is called while writing the
548 * header and no extradata is available. The space for this element has
549 * to be reserved for when this function is called again after the
550 * extradata shows up in the first packet, as there's no way to know if
551 * output_sample_rate will be different than sample_rate or not. */
552 *output_sample_rate = *sample_rate;
554 *sample_rate = mp4ac.sample_rate;
555 *output_sample_rate = mp4ac.ext_sample_rate;
560 static int mkv_write_native_codecprivate(AVFormatContext *s,
561 AVCodecParameters *par,
564 switch (par->codec_id) {
565 case AV_CODEC_ID_VORBIS:
566 case AV_CODEC_ID_THEORA:
567 return put_xiph_codecpriv(s, dyn_cp, par);
568 case AV_CODEC_ID_FLAC:
569 return put_flac_codecpriv(s, dyn_cp, par);
570 case AV_CODEC_ID_WAVPACK:
571 return put_wv_codecpriv(dyn_cp, par);
572 case AV_CODEC_ID_H264:
573 return ff_isom_write_avcc(dyn_cp, par->extradata,
574 par->extradata_size);
575 case AV_CODEC_ID_HEVC:
576 return ff_isom_write_hvcc(dyn_cp, par->extradata,
577 par->extradata_size, 0);
578 case AV_CODEC_ID_ALAC:
579 if (par->extradata_size < 36) {
580 av_log(s, AV_LOG_ERROR,
581 "Invalid extradata found, ALAC expects a 36-byte "
583 return AVERROR_INVALIDDATA;
585 avio_write(dyn_cp, par->extradata + 12,
586 par->extradata_size - 12);
589 if (par->extradata_size)
590 avio_write(dyn_cp, par->extradata, par->extradata_size);
596 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
597 AVCodecParameters *par,
598 int native_id, int qt_id)
602 int ret, codecpriv_size;
604 ret = avio_open_dyn_buf(&dyn_cp);
609 ret = mkv_write_native_codecprivate(s, par, dyn_cp);
610 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
613 par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
615 if (par->extradata_size)
616 avio_write(dyn_cp, par->extradata, par->extradata_size);
619 par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
621 if (!par->codec_tag) {
622 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
626 ff_put_bmp_header(dyn_cp, par, ff_codec_bmp_tags, 0);
628 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
630 tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
632 av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
636 par->codec_tag = tag;
638 ff_put_wav_header(s, dyn_cp, par);
641 codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
643 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
649 static void mkv_write_field_order(AVIOContext *pb,
650 enum AVFieldOrder field_order)
652 switch (field_order) {
653 case AV_FIELD_UNKNOWN:
654 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
655 MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED);
657 case AV_FIELD_PROGRESSIVE:
658 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
659 MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
665 put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
666 MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
667 switch (field_order) {
669 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
670 MATROSKA_VIDEO_FIELDORDER_TT);
673 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
674 MATROSKA_VIDEO_FIELDORDER_BB);
677 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
678 MATROSKA_VIDEO_FIELDORDER_TB);
681 put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
682 MATROSKA_VIDEO_FIELDORDER_BT);
688 static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
689 AVStream *st, int mode)
692 int display_width, display_height;
693 int h_width = 1, h_height = 1;
694 AVCodecParameters *par = st->codecpar;
695 AVDictionaryEntry *tag;
696 MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
698 // convert metadata into proper side data and add it to the stream
699 if ((tag = av_dict_get(s->metadata, "stereo_mode", NULL, 0))) {
700 int stereo_mode = atoi(tag->value);
701 if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
702 stereo_mode != 10 && stereo_mode != 12) {
703 int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
709 // iterate to find the stereo3d side data
710 for (i = 0; i < st->nb_side_data; i++) {
711 AVPacketSideData sd = st->side_data[i];
712 if (sd.type == AV_PKT_DATA_STEREO3D) {
713 AVStereo3D *stereo = (AVStereo3D *)sd.data;
715 switch (stereo->type) {
717 format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
719 case AV_STEREO3D_SIDEBYSIDE:
720 format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
721 ? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
722 : MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
725 case AV_STEREO3D_TOPBOTTOM:
726 format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
727 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
731 case AV_STEREO3D_CHECKERBOARD:
732 format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
733 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
736 case AV_STEREO3D_LINES:
737 format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
738 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
742 case AV_STEREO3D_COLUMNS:
743 format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
744 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
748 case AV_STEREO3D_FRAMESEQUENCE:
749 format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
750 if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
759 // if webm, do not write unsupported modes
760 if (mode == MODE_WEBM &&
761 (format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
762 format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT))
763 format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
765 // write StereoMode if format is valid
766 if (format < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
767 put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
769 // write DisplayWidth and DisplayHeight, they contain the size of
770 // a single source view and/or the display aspect ratio
771 display_width = par->width / h_width;
772 display_height = par->height / h_height;
773 if (st->sample_aspect_ratio.num) {
774 display_width *= av_q2d(st->sample_aspect_ratio);
775 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3); // DAR
777 if (st->sample_aspect_ratio.num ||
778 format < MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
779 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_width);
780 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_height);
786 static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
787 int i, AVIOContext *pb)
789 AVStream *st = s->streams[i];
790 AVCodecParameters *par = st->codecpar;
791 ebml_master subinfo, track;
794 int bit_depth = av_get_bits_per_sample(par->codec_id);
795 int sample_rate = par->sample_rate;
796 int output_sample_rate = 0;
798 AVDictionaryEntry *tag;
800 // ms precision is the de-facto standard timescale for mkv files
801 avpriv_set_pts_info(st, 64, 1, 1000);
803 if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
804 mkv->have_attachments = 1;
809 bit_depth = av_get_bytes_per_sample(par->format) << 3;
811 if (par->codec_id == AV_CODEC_ID_AAC) {
812 ret = get_aac_sample_rates(s, par->extradata, par->extradata_size, &sample_rate,
813 &output_sample_rate);
818 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
819 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
820 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
821 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
823 if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
824 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
825 tag = av_dict_get(st->metadata, "language", NULL, 0);
826 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
828 // The default value for TRACKFLAGDEFAULT is 1, so add element
829 // if we need to clear it.
830 if (!(st->disposition & AV_DISPOSITION_DEFAULT))
831 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
832 if (st->disposition & AV_DISPOSITION_FORCED)
833 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, !!(st->disposition & AV_DISPOSITION_FORCED));
835 if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding) {
836 mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
837 (AVRational){ 1, par->sample_rate },
840 put_ebml_uint(pb, MATROSKA_ID_CODECDELAY,
841 av_rescale_q(par->initial_padding,
842 (AVRational){ 1, par->sample_rate },
843 (AVRational){ 1, 1000000000 }));
846 // look for a codec ID string specific to mkv to use,
847 // if none are found, use AVI codes
848 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
849 if (ff_mkv_codec_tags[j].id == par->codec_id) {
850 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
856 if (mkv->mode == MODE_WEBM && !(par->codec_id == AV_CODEC_ID_VP8 ||
857 par->codec_id == AV_CODEC_ID_VP9 ||
858 par->codec_id == AV_CODEC_ID_OPUS ||
859 par->codec_id == AV_CODEC_ID_VORBIS)) {
860 av_log(s, AV_LOG_ERROR,
861 "Only VP8 or VP9 video and Vorbis or Opus audio are supported for WebM.\n");
862 return AVERROR(EINVAL);
865 switch (par->codec_type) {
866 case AVMEDIA_TYPE_VIDEO:
868 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
869 if (st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0)
870 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9 / av_q2d(st->avg_frame_rate));
873 ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
874 (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) ||
875 par->codec_id == AV_CODEC_ID_SVQ1 ||
876 par->codec_id == AV_CODEC_ID_SVQ3 ||
877 par->codec_id == AV_CODEC_ID_CINEPAK))
881 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
882 else if (!native_id) {
883 // if there is no mkv-specific codec ID, use VFW mode
884 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
885 mkv->tracks[i].write_dts = 1;
888 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
890 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
891 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
893 mkv_write_field_order(pb, par->field_order);
895 // check both side data and metadata for stereo information,
896 // write the result to the bitstream if any is found
897 ret = mkv_write_stereo_mode(s, pb, st, mkv->mode);
901 end_ebml_master(pb, subinfo);
904 case AVMEDIA_TYPE_AUDIO:
905 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
908 // no mkv-specific ID, use ACM mode
909 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
911 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
912 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
914 mkv->tracks[i].sample_rate_offset = avio_tell(pb);
915 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
916 if (output_sample_rate)
917 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
919 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
920 end_ebml_master(pb, subinfo);
923 case AVMEDIA_TYPE_SUBTITLE:
924 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
926 av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
927 return AVERROR(ENOSYS);
931 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
935 mkv->tracks[i].codecpriv_offset = avio_tell(pb);
936 ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
940 end_ebml_master(pb, track);
945 static int mkv_write_tracks(AVFormatContext *s)
947 MatroskaMuxContext *mkv = s->priv_data;
948 AVIOContext *pb = s->pb;
952 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
956 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
957 for (i = 0; i < s->nb_streams; i++) {
958 ret = mkv_write_track(s, mkv, i, pb);
962 end_ebml_master(pb, tracks);
966 static int mkv_write_chapters(AVFormatContext *s)
968 MatroskaMuxContext *mkv = s->priv_data;
969 AVIOContext *pb = s->pb;
970 ebml_master chapters, editionentry;
971 AVRational scale = {1, 1E9};
974 if (!s->nb_chapters || mkv->wrote_chapters)
977 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
978 if (ret < 0) return ret;
980 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
981 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
982 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
983 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
984 for (i = 0; i < s->nb_chapters; i++) {
985 ebml_master chapteratom, chapterdisplay;
986 AVChapter *c = s->chapters[i];
987 int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
988 int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
989 AVDictionaryEntry *t = NULL;
990 if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
991 av_log(s, AV_LOG_ERROR,
992 "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
993 chapterstart, chapterend);
994 return AVERROR_INVALIDDATA;
997 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
998 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
999 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1000 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1001 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1002 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1003 if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1004 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
1005 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
1006 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
1007 end_ebml_master(pb, chapterdisplay);
1009 end_ebml_master(pb, chapteratom);
1011 end_ebml_master(pb, editionentry);
1012 end_ebml_master(pb, chapters);
1014 mkv->wrote_chapters = 1;
1018 static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1020 uint8_t *key = av_strdup(t->key);
1022 const uint8_t *lang = NULL;
1026 return AVERROR(ENOMEM);
1028 if ((p = strrchr(p, '-')) &&
1029 (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1036 else if (*p >= 'a' && *p <= 'z')
1041 tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1042 put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1044 put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1045 put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1046 end_ebml_master(pb, tag);
1052 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1053 unsigned int uid, ebml_master *tags)
1055 MatroskaMuxContext *mkv = s->priv_data;
1056 ebml_master tag, targets;
1057 AVDictionaryEntry *t = NULL;
1061 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1062 if (ret < 0) return ret;
1064 *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
1067 tag = start_ebml_master(s->pb, MATROSKA_ID_TAG, 0);
1068 targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
1070 put_ebml_uint(s->pb, elementid, uid);
1071 end_ebml_master(s->pb, targets);
1073 while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1074 if (av_strcasecmp(t->key, "title") &&
1075 av_strcasecmp(t->key, "encoding_tool") &&
1076 (elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1077 av_strcasecmp(t->key, "language"))) {
1078 ret = mkv_write_simpletag(s->pb, t);
1084 end_ebml_master(s->pb, tag);
1088 static int mkv_write_tags(AVFormatContext *s)
1090 ebml_master tags = {0};
1093 ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1095 if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
1096 ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
1097 if (ret < 0) return ret;
1100 for (i = 0; i < s->nb_streams; i++) {
1101 AVStream *st = s->streams[i];
1103 if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
1106 ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
1107 if (ret < 0) return ret;
1110 for (i = 0; i < s->nb_chapters; i++) {
1111 AVChapter *ch = s->chapters[i];
1113 if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
1116 ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
1117 if (ret < 0) return ret;
1121 end_ebml_master(s->pb, tags);
1125 static int mkv_write_attachments(AVFormatContext *s)
1127 MatroskaMuxContext *mkv = s->priv_data;
1128 AVIOContext *pb = s->pb;
1129 ebml_master attachments;
1133 if (!mkv->have_attachments)
1136 av_lfg_init(&c, av_get_random_seed());
1138 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1139 if (ret < 0) return ret;
1141 attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);
1143 for (i = 0; i < s->nb_streams; i++) {
1144 AVStream *st = s->streams[i];
1145 ebml_master attached_file;
1146 AVDictionaryEntry *t;
1147 const char *mimetype = NULL;
1149 if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1152 attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);
1154 if (t = av_dict_get(st->metadata, "title", NULL, 0))
1155 put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);
1156 if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1157 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1158 return AVERROR(EINVAL);
1160 put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);
1161 if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1162 mimetype = t->value;
1163 else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1165 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1166 if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1167 mimetype = ff_mkv_mime_tags[i].str;
1170 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1171 if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1172 mimetype = ff_mkv_image_mime_tags[i].str;
1177 av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1178 "it cannot be deduced from the codec id.\n", i);
1179 return AVERROR(EINVAL);
1182 put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);
1183 put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1184 put_ebml_uint(pb, MATROSKA_ID_FILEUID, av_lfg_get(&c));
1185 end_ebml_master(pb, attached_file);
1187 end_ebml_master(pb, attachments);
1192 static int mkv_write_header(AVFormatContext *s)
1194 MatroskaMuxContext *mkv = s->priv_data;
1195 AVIOContext *pb = s->pb;
1196 ebml_master ebml_header, segment_info;
1197 AVDictionaryEntry *tag;
1200 if (!strcmp(s->oformat->name, "webm"))
1201 mkv->mode = MODE_WEBM;
1203 mkv->mode = MODE_MATROSKAv2;
1205 mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
1207 return AVERROR(ENOMEM);
1209 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1210 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1211 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1212 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1213 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1214 put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1215 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 4);
1216 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1217 end_ebml_master(pb, ebml_header);
1219 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1220 mkv->segment_offset = avio_tell(pb);
1222 // we write 2 seek heads - one at the end of the file to point to each
1223 // cluster, and one at the beginning to point to all other level one
1224 // elements (including the seek head at the end of the file), which
1225 // isn't more than 10 elements if we only write one of each other
1226 // currently defined level 1 element
1227 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1228 if (!mkv->main_seekhead)
1229 return AVERROR(ENOMEM);
1231 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1232 if (ret < 0) return ret;
1234 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
1235 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1236 if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1237 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1238 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1239 uint32_t segment_uid[4];
1242 av_lfg_init(&lfg, av_get_random_seed());
1244 for (i = 0; i < 4; i++)
1245 segment_uid[i] = av_lfg_get(&lfg);
1247 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1248 if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1249 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1251 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1252 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1255 // reserve space for the duration
1257 mkv->duration_offset = avio_tell(pb);
1258 put_ebml_void(pb, 11); // assumes double-precision float to be written
1259 end_ebml_master(pb, segment_info);
1261 ret = mkv_write_tracks(s);
1265 if (mkv->mode != MODE_WEBM) {
1266 ret = mkv_write_chapters(s);
1270 ret = mkv_write_tags(s);
1274 ret = mkv_write_attachments(s);
1279 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
1280 mkv_write_seekhead(pb, mkv->main_seekhead);
1282 mkv->cues = mkv_start_cues(mkv->segment_offset);
1284 return AVERROR(ENOMEM);
1286 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && mkv->reserve_cues_space) {
1287 mkv->cues_pos = avio_tell(pb);
1288 put_ebml_void(pb, mkv->reserve_cues_space);
1291 av_init_packet(&mkv->cur_audio_pkt);
1292 mkv->cur_audio_pkt.size = 0;
1296 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1297 // after 4k and on a keyframe
1298 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
1299 if (mkv->cluster_time_limit < 0)
1300 mkv->cluster_time_limit = 5000;
1301 if (mkv->cluster_size_limit < 0)
1302 mkv->cluster_size_limit = 5 * 1024 * 1024;
1304 if (mkv->cluster_time_limit < 0)
1305 mkv->cluster_time_limit = 1000;
1306 if (mkv->cluster_size_limit < 0)
1307 mkv->cluster_size_limit = 32 * 1024;
1313 static int mkv_blockgroup_size(int pkt_size)
1315 int size = pkt_size + 4;
1316 size += ebml_num_size(size);
1317 size += 2; // EBML ID for block and block duration
1318 size += 8; // max size of block duration
1319 size += ebml_num_size(size);
1320 size += 1; // blockgroup EBML ID
1324 static int ass_get_duration(AVFormatContext *s, const uint8_t *p)
1326 int sh, sm, ss, sc, eh, em, es, ec;
1327 uint64_t start, end;
1329 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
1330 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
1333 if (sh > 9 || sm > 59 || ss > 59 || sc > 99 ||
1334 eh > 9 || em > 59 || es > 59 || ec > 99) {
1335 av_log(s, AV_LOG_WARNING,
1336 "Non-standard time reference %d:%d:%d.%d,%d:%d:%d.%d\n",
1337 sh, sm, ss, sc, eh, em, es, ec);
1341 start = 3600000 * sh + 60000 * sm + 1000 * ss + 10 * sc;
1342 end = 3600000 * eh + 60000 * em + 1000 * es + 10 * ec;
1345 av_log(s, AV_LOG_WARNING,
1346 "Unexpected time reference %d:%d:%d.%d,%d:%d:%d.%d\n",
1347 sh, sm, ss, sc, eh, em, es, ec);
1354 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb,
1357 MatroskaMuxContext *mkv = s->priv_data;
1358 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
1359 uint8_t *start, *end, *data = pkt->data;
1360 ebml_master blockgroup;
1364 int duration = ass_get_duration(s, data);
1365 max_duration = FFMAX(duration, max_duration);
1366 end = memchr(data, '\n', data_size);
1367 size = line_size = end ? end - data + 1 : data_size;
1368 size -= end ? (end[-1] == '\r') + 1 : 0;
1370 for (i = 0; i < 3; i++, start++)
1371 if (!(start = memchr(start, ',', size - (start - data))))
1372 return max_duration;
1373 size -= start - data;
1374 sscanf(data, "Dialogue: %d,", &layer);
1375 i = snprintf(buffer, sizeof(buffer), "%" PRId64 ",%d,",
1376 s->streams[pkt->stream_index]->nb_frames, layer);
1377 size = FFMIN(i + size, sizeof(buffer));
1378 memcpy(buffer + i, start, size - i);
1380 av_log(s, AV_LOG_DEBUG,
1381 "Writing block at offset %" PRIu64 ", size %d, "
1382 "pts %" PRId64 ", duration %d\n",
1383 avio_tell(pb), size, pkt->pts, duration);
1384 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1385 mkv_blockgroup_size(size));
1386 put_ebml_id(pb, MATROSKA_ID_BLOCK);
1387 put_ebml_num(pb, size + 4, 0);
1388 // this assumes stream_index is less than 126
1389 avio_w8(pb, 0x80 | (pkt->stream_index + 1));
1390 avio_wb16(pb, pkt->pts - mkv->cluster_pts);
1392 avio_write(pb, buffer, size);
1393 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1394 end_ebml_master(pb, blockgroup);
1397 data_size -= line_size;
1400 return max_duration;
1403 static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
1410 dst = av_malloc(srclen);
1412 return AVERROR(ENOMEM);
1414 while (srclen >= WV_HEADER_SIZE) {
1417 ret = ff_wv_parse_header(&header, src);
1420 src += WV_HEADER_SIZE;
1421 srclen -= WV_HEADER_SIZE;
1423 if (srclen < header.blocksize) {
1424 ret = AVERROR_INVALIDDATA;
1428 if (header.initial) {
1429 AV_WL32(dst + offset, header.samples);
1432 AV_WL32(dst + offset, header.flags);
1433 AV_WL32(dst + offset + 4, header.crc);
1436 if (!(header.initial && header.final)) {
1437 AV_WL32(dst + offset, header.blocksize);
1441 memcpy(dst + offset, src, header.blocksize);
1442 src += header.blocksize;
1443 srclen -= header.blocksize;
1444 offset += header.blocksize;
1456 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
1457 unsigned int blockid, AVPacket *pkt, int flags)
1459 MatroskaMuxContext *mkv = s->priv_data;
1460 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
1461 uint8_t *data = NULL;
1462 int offset = 0, size = pkt->size;
1463 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1465 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
1466 "pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
1467 avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
1468 if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
1469 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1470 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
1471 else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
1472 (AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
1473 /* extradata is Annex B, assume the bitstream is too and convert it */
1474 ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
1475 else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
1476 int ret = mkv_strip_wavpack(pkt->data, &data, &size);
1478 av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
1484 if (par->codec_id == AV_CODEC_ID_PRORES) {
1485 /* Matroska specification requires to remove the first QuickTime atom
1491 put_ebml_id(pb, blockid);
1492 put_ebml_num(pb, size + 4, 0);
1493 // this assumes stream_index is less than 126
1494 avio_w8(pb, 0x80 | (pkt->stream_index + 1));
1495 avio_wb16(pb, ts - mkv->cluster_pts);
1497 avio_write(pb, data + offset, size);
1498 if (data != pkt->data)
1502 static int srt_get_duration(uint8_t **buf)
1504 int i, duration = 0;
1506 for (i = 0; i < 2 && !duration; i++) {
1507 int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
1508 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
1509 &s_hour, &s_min, &s_sec, &s_hsec,
1510 &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
1511 s_min += 60 * s_hour;
1512 e_min += 60 * e_hour;
1513 s_sec += 60 * s_min;
1515 e_sec += 60 * e_min;
1516 s_hsec += 1000 * s_sec;
1517 e_hsec += 1000 * e_sec;
1519 duration = e_hsec - s_hsec;
1521 *buf += strcspn(*buf, "\n") + 1;
1526 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb,
1529 ebml_master blockgroup;
1530 AVPacket pkt2 = *pkt;
1531 int64_t duration = srt_get_duration(&pkt2.data);
1532 pkt2.size -= pkt2.data - pkt->data;
1534 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1535 mkv_blockgroup_size(pkt2.size));
1536 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
1537 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1538 end_ebml_master(pb, blockgroup);
1543 static void mkv_flush_dynbuf(AVFormatContext *s)
1545 MatroskaMuxContext *mkv = s->priv_data;
1552 bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
1553 avio_write(s->pb, dyn_buf, bufsize);
1558 static int mkv_check_new_extra_data(AVFormatContext *s, AVPacket *pkt)
1560 MatroskaMuxContext *mkv = s->priv_data;
1561 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
1562 mkv_track *track = &mkv->tracks[pkt->stream_index];
1564 int side_data_size = 0, ret;
1566 side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
1569 switch (par->codec_id) {
1570 case AV_CODEC_ID_AAC:
1571 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1572 int output_sample_rate = 0;
1574 ret = get_aac_sample_rates(s, side_data, side_data_size, &track->sample_rate,
1575 &output_sample_rate);
1578 if (!output_sample_rate)
1579 output_sample_rate = track->sample_rate; // Space is already reserved, so it's this or a void element.
1580 curpos = avio_tell(s->pb);
1581 avio_seek(s->pb, track->sample_rate_offset, SEEK_SET);
1582 put_ebml_float(s->pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, track->sample_rate);
1583 put_ebml_float(s->pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1584 avio_seek(s->pb, curpos, SEEK_SET);
1585 } else if (!par->extradata_size && !track->sample_rate) {
1586 // No extradata (codecpar or packet side data).
1587 av_log(s, AV_LOG_ERROR, "Error parsing AAC extradata, unable to determine samplerate.\n");
1588 return AVERROR(EINVAL);
1591 case AV_CODEC_ID_FLAC:
1592 if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1593 AVCodecParameters *codecpriv_par;
1595 if (side_data_size != par->extradata_size) {
1596 av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
1598 return AVERROR(EINVAL);
1600 codecpriv_par = avcodec_parameters_alloc();
1602 return AVERROR(ENOMEM);
1603 ret = avcodec_parameters_copy(codecpriv_par, par);
1605 avcodec_parameters_free(&codecpriv_par);
1608 memcpy(codecpriv_par->extradata, side_data, side_data_size);
1609 curpos = avio_tell(s->pb);
1610 avio_seek(s->pb, track->codecpriv_offset, SEEK_SET);
1611 mkv_write_codecprivate(s, s->pb, codecpriv_par, 1, 0);
1612 avio_seek(s->pb, curpos, SEEK_SET);
1613 avcodec_parameters_free(&codecpriv_par);
1618 av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
1625 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1627 MatroskaMuxContext *mkv = s->priv_data;
1628 AVIOContext *pb = s->pb;
1629 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
1630 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1631 int duration = pkt->duration;
1633 int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
1635 if (ts == AV_NOPTS_VALUE) {
1636 av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
1637 return AVERROR(EINVAL);
1639 ts += mkv->tracks[pkt->stream_index].ts_offset;
1641 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1643 ret = avio_open_dyn_buf(&mkv->dyn_bc);
1650 if (!mkv->cluster_pos) {
1651 mkv->cluster_pos = avio_tell(s->pb);
1652 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
1653 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
1654 mkv->cluster_pts = FFMAX(0, ts);
1657 if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
1658 mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
1659 } else if (par->codec_id == AV_CODEC_ID_SSA) {
1660 duration = mkv_write_ass_blocks(s, pb, pkt);
1661 } else if (par->codec_id == AV_CODEC_ID_SRT) {
1662 duration = mkv_write_srt_blocks(s, pb, pkt);
1664 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
1665 mkv_blockgroup_size(pkt->size));
1666 duration = pkt->duration;
1667 #if FF_API_CONVERGENCE_DURATION
1668 FF_DISABLE_DEPRECATION_WARNINGS
1669 if (pkt->convergence_duration)
1670 duration = pkt->convergence_duration;
1671 FF_ENABLE_DEPRECATION_WARNINGS
1673 mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
1674 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
1675 end_ebml_master(pb, blockgroup);
1678 if (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
1679 ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts,
1685 mkv->duration = FFMAX(mkv->duration, ts + duration);
1689 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
1691 MatroskaMuxContext *mkv = s->priv_data;
1692 int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
1693 int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
1695 int64_t cluster_time;
1699 ret = mkv_check_new_extra_data(s, pkt);
1703 if (mkv->tracks[pkt->stream_index].write_dts)
1704 cluster_time = pkt->dts - mkv->cluster_pts;
1706 cluster_time = pkt->pts - mkv->cluster_pts;
1707 cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
1709 // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1710 // after 4k and on a keyframe
1711 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
1713 cluster_size = avio_tell(pb) - mkv->cluster_pos;
1716 cluster_size = avio_tell(pb);
1719 if (mkv->cluster_pos &&
1720 (cluster_size > mkv->cluster_size_limit ||
1721 cluster_time > mkv->cluster_time_limit ||
1722 (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
1723 cluster_size > 4 * 1024))) {
1724 av_log(s, AV_LOG_DEBUG,
1725 "Starting new cluster at offset %" PRIu64 " bytes, "
1726 "pts %" PRIu64 "dts %" PRIu64 "\n",
1727 avio_tell(pb), pkt->pts, pkt->dts);
1728 end_ebml_master(pb, mkv->cluster);
1729 mkv->cluster_pos = 0;
1731 mkv_flush_dynbuf(s);
1735 if (!mkv->cluster_pos)
1736 avio_write_marker(s->pb,
1737 av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
1738 keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
1740 // check if we have an audio packet cached
1741 if (mkv->cur_audio_pkt.size > 0) {
1742 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1743 av_packet_unref(&mkv->cur_audio_pkt);
1745 av_log(s, AV_LOG_ERROR,
1746 "Could not write cached audio packet ret:%d\n", ret);
1751 // buffer an audio packet to ensure the packet containing the video
1752 // keyframe's timecode is contained in the same cluster for WebM
1753 if (codec_type == AVMEDIA_TYPE_AUDIO) {
1754 ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
1756 ret = mkv_write_packet_internal(s, pkt);
1760 static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
1762 MatroskaMuxContext *mkv = s->priv_data;
1764 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
1769 if (mkv->cluster_pos) {
1770 av_log(s, AV_LOG_DEBUG,
1771 "Flushing cluster at offset %" PRIu64 " bytes\n",
1773 end_ebml_master(pb, mkv->cluster);
1774 mkv->cluster_pos = 0;
1776 mkv_flush_dynbuf(s);
1781 return mkv_write_packet(s, pkt);
1784 static int mkv_write_trailer(AVFormatContext *s)
1786 MatroskaMuxContext *mkv = s->priv_data;
1787 AVIOContext *pb = s->pb;
1788 int64_t currentpos, cuespos;
1791 // check if we have an audio packet cached
1792 if (mkv->cur_audio_pkt.size > 0) {
1793 ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
1794 av_packet_unref(&mkv->cur_audio_pkt);
1796 av_log(s, AV_LOG_ERROR,
1797 "Could not write cached audio packet ret:%d\n", ret);
1803 end_ebml_master(mkv->dyn_bc, mkv->cluster);
1804 mkv_flush_dynbuf(s);
1805 } else if (mkv->cluster_pos) {
1806 end_ebml_master(pb, mkv->cluster);
1809 if (mkv->mode != MODE_WEBM) {
1810 ret = mkv_write_chapters(s);
1815 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
1816 if (mkv->cues->num_entries) {
1817 if (mkv->reserve_cues_space) {
1820 currentpos = avio_tell(pb);
1821 avio_seek(pb, mkv->cues_pos, SEEK_SET);
1823 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1824 cues_end = avio_tell(pb);
1825 if (cues_end > cuespos + mkv->reserve_cues_space) {
1826 av_log(s, AV_LOG_ERROR,
1827 "Insufficient space reserved for cues: %d "
1828 "(needed: %" PRId64 ").\n",
1829 mkv->reserve_cues_space, cues_end - cuespos);
1830 return AVERROR(EINVAL);
1833 if (cues_end < cuespos + mkv->reserve_cues_space)
1834 put_ebml_void(pb, mkv->reserve_cues_space -
1835 (cues_end - cuespos));
1837 avio_seek(pb, currentpos, SEEK_SET);
1839 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
1842 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
1848 mkv_write_seekhead(pb, mkv->main_seekhead);
1850 // update the duration
1851 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
1852 currentpos = avio_tell(pb);
1853 avio_seek(pb, mkv->duration_offset, SEEK_SET);
1854 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
1856 avio_seek(pb, currentpos, SEEK_SET);
1859 end_ebml_master(pb, mkv->segment);
1860 av_free(mkv->tracks);
1861 av_freep(&mkv->cues->entries);
1862 av_freep(&mkv->cues);
1867 static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
1870 for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
1871 if (ff_mkv_codec_tags[i].id == codec_id)
1874 if (std_compliance < FF_COMPLIANCE_NORMAL) {
1875 enum AVMediaType type = avcodec_get_type(codec_id);
1876 // mkv theoretically supports any video/audio through VFW/ACM
1877 if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
1884 #define OFFSET(x) offsetof(MatroskaMuxContext, x)
1885 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
1886 static const AVOption options[] = {
1887 { "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 },
1888 { "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 },
1889 { "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 },
1893 #if CONFIG_MATROSKA_MUXER
1894 static const AVClass matroska_class = {
1895 .class_name = "matroska muxer",
1896 .item_name = av_default_item_name,
1898 .version = LIBAVUTIL_VERSION_INT,
1901 AVOutputFormat ff_matroska_muxer = {
1903 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1904 .mime_type = "video/x-matroska",
1905 .extensions = "mkv",
1906 .priv_data_size = sizeof(MatroskaMuxContext),
1907 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1908 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1909 .video_codec = CONFIG_LIBX264_ENCODER ?
1910 AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
1911 .write_header = mkv_write_header,
1912 .write_packet = mkv_write_flush_packet,
1913 .write_trailer = mkv_write_trailer,
1914 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1915 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1916 .codec_tag = (const AVCodecTag* const []){
1917 ff_codec_bmp_tags, ff_codec_wav_tags, 0
1919 .subtitle_codec = AV_CODEC_ID_SSA,
1920 .query_codec = mkv_query_codec,
1921 .priv_class = &matroska_class,
1925 #if CONFIG_WEBM_MUXER
1926 static const AVClass webm_class = {
1927 .class_name = "webm muxer",
1928 .item_name = av_default_item_name,
1930 .version = LIBAVUTIL_VERSION_INT,
1933 AVOutputFormat ff_webm_muxer = {
1935 .long_name = NULL_IF_CONFIG_SMALL("WebM"),
1936 .mime_type = "video/webm",
1937 .extensions = "webm",
1938 .priv_data_size = sizeof(MatroskaMuxContext),
1939 .audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
1940 .video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
1941 .write_header = mkv_write_header,
1942 .write_packet = mkv_write_flush_packet,
1943 .write_trailer = mkv_write_trailer,
1944 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1945 AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
1946 .priv_class = &webm_class,
1950 #if CONFIG_MATROSKA_AUDIO_MUXER
1951 static const AVClass mka_class = {
1952 .class_name = "matroska audio muxer",
1953 .item_name = av_default_item_name,
1955 .version = LIBAVUTIL_VERSION_INT,
1957 AVOutputFormat ff_matroska_audio_muxer = {
1959 .long_name = NULL_IF_CONFIG_SMALL("Matroska"),
1960 .mime_type = "audio/x-matroska",
1961 .extensions = "mka",
1962 .priv_data_size = sizeof(MatroskaMuxContext),
1963 .audio_codec = CONFIG_LIBVORBIS_ENCODER ?
1964 AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
1965 .video_codec = AV_CODEC_ID_NONE,
1966 .write_header = mkv_write_header,
1967 .write_packet = mkv_write_flush_packet,
1968 .write_trailer = mkv_write_trailer,
1969 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
1971 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
1972 .priv_class = &mka_class,