path: root/libavformat/matroskaenc.c (plain)
blob: 9c7a213db96a7722e099f72f4474f5e0ff1e1ca8

1	/*
2	* Matroska muxer
3	* Copyright (c) 2007 David Conrad
4	*
5	* This file is part of FFmpeg.
6	*
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.
11	*
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.
16	*
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
20	*/
21
22	#include <stdint.h>
23
24	#include "avc.h"
25	#include "hevc.h"
26	#include "avformat.h"
27	#include "avio_internal.h"
28	#include "avlanguage.h"
29	#include "flacenc.h"
30	#include "internal.h"
31	#include "isom.h"
32	#include "matroska.h"
33	#include "riff.h"
34	#include "subtitles.h"
35	#include "vorbiscomment.h"
36	#include "wv.h"
37
38	#include "libavutil/avstring.h"
39	#include "libavutil/channel_layout.h"
40	#include "libavutil/crc.h"
41	#include "libavutil/dict.h"
42	#include "libavutil/intfloat.h"
43	#include "libavutil/intreadwrite.h"
44	#include "libavutil/lfg.h"
45	#include "libavutil/mastering_display_metadata.h"
46	#include "libavutil/mathematics.h"
47	#include "libavutil/opt.h"
48	#include "libavutil/parseutils.h"
49	#include "libavutil/random_seed.h"
50	#include "libavutil/rational.h"
51	#include "libavutil/samplefmt.h"
52	#include "libavutil/sha.h"
53	#include "libavutil/stereo3d.h"
54
55	#include "libavcodec/xiph.h"
56	#include "libavcodec/mpeg4audio.h"
57	#include "libavcodec/internal.h"
58
59	typedef struct ebml_master {
60	int64_t pos; ///< absolute offset in the file where the master's elements start
61	int sizebytes; ///< how many bytes were reserved for the size
62	} ebml_master;
63
64	typedef struct mkv_seekhead_entry {
65	unsigned int elementid;
66	uint64_t segmentpos;
67	} mkv_seekhead_entry;
68
69	typedef struct mkv_seekhead {
70	int64_t filepos;
71	int64_t segment_offset; ///< the file offset to the beginning of the segment
72	int reserved_size; ///< -1 if appending to file
73	int max_entries;
74	mkv_seekhead_entry *entries;
75	int num_entries;
76	} mkv_seekhead;
77
78	typedef struct mkv_cuepoint {
79	uint64_t pts;
80	int stream_idx;
81	int tracknum;
82	int64_t cluster_pos; ///< file offset of the cluster containing the block
83	int64_t relative_pos; ///< relative offset from the position of the cluster containing the block
84	int64_t duration; ///< duration of the block according to time base
85	} mkv_cuepoint;
86
87	typedef struct mkv_cues {
88	int64_t segment_offset;
89	mkv_cuepoint *entries;
90	int num_entries;
91	} mkv_cues;
92
93	typedef struct mkv_track {
94	int write_dts;
95	int has_cue;
96	int64_t codecpriv_offset;
97	int64_t ts_offset;
98	} mkv_track;
99
100	typedef struct mkv_attachment {
101	int stream_idx;
102	uint32_t fileuid;
103	} mkv_attachment;
104
105	typedef struct mkv_attachments {
106	mkv_attachment *entries;
107	int num_entries;
108	} mkv_attachments;
109
110	#define MODE_MATROSKAv2 0x01
111	#define MODE_WEBM 0x02
112
113	/** Maximum number of tracks allowed in a Matroska file (with track numbers in
114	* range 1 to 126 (inclusive) */
115	#define MAX_TRACKS 126
116
117	typedef struct MatroskaMuxContext {
118	const AVClass *class;
119	int mode;
120	AVIOContext *dyn_bc;
121	AVIOContext *tags_bc;
122	ebml_master tags;
123	AVIOContext *info_bc;
124	ebml_master info;
125	AVIOContext *tracks_bc;
126	ebml_master tracks_master;
127	ebml_master segment;
128	int64_t segment_offset;
129	ebml_master cluster;
130	int64_t cluster_pos; ///< file offset of the current cluster
131	int64_t cluster_pts;
132	int64_t duration_offset;
133	int64_t duration;
134	mkv_seekhead *main_seekhead;
135	mkv_cues *cues;
136	mkv_track *tracks;
137	mkv_attachments *attachments;
138
139	AVPacket cur_audio_pkt;
140
141	int have_attachments;
142	int have_video;
143
144	int reserve_cues_space;
145	int cluster_size_limit;
146	int64_t cues_pos;
147	int64_t cluster_time_limit;
148	int is_dash;
149	int dash_track_number;
150	int is_live;
151	int write_crc;
152
153	uint32_t chapter_id_offset;
154	int wrote_chapters;
155
156	int64_t last_track_timestamp[MAX_TRACKS];
157
158	int64_t* stream_durations;
159	int64_t* stream_duration_offsets;
160
161	int allow_raw_vfw;
162	} MatroskaMuxContext;
163
164
165	/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
166	* offset, 4 bytes for target EBML ID */
167	#define MAX_SEEKENTRY_SIZE 21
168
169	/** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4
170	* 8-byte uint max */
171	#define MAX_CUETRACKPOS_SIZE 42
172
173	/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
174	#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE * num_tracks
175
176	/** Seek preroll value for opus */
177	#define OPUS_SEEK_PREROLL 80000000
178
179	static int ebml_id_size(unsigned int id)
180	{
181	return (av_log2(id + 1) - 1) / 7 + 1;
182	}
183
184	static void put_ebml_id(AVIOContext *pb, unsigned int id)
185	{
186	int i = ebml_id_size(id);
187	while (i--)
188	avio_w8(pb, (uint8_t)(id >> (i * 8)));
189	}
190
191	/**
192	* Write an EBML size meaning "unknown size".
193	*
194	* @param bytes The number of bytes the size should occupy (maximum: 8).
195	*/
196	static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
197	{
198	av_assert0(bytes <= 8);
199	avio_w8(pb, 0x1ff >> bytes);
200	ffio_fill(pb, 0xff, bytes - 1);
201	}
202
203	/**
204	* Calculate how many bytes are needed to represent a given number in EBML.
205	*/
206	static int ebml_num_size(uint64_t num)
207	{
208	int bytes = 1;
209	while ((num + 1) >> bytes * 7)
210	bytes++;
211	return bytes;
212	}
213
214	/**
215	* Write a number in EBML variable length format.
216	*
217	* @param bytes The number of bytes that need to be used to write the number.
218	* If zero, any number of bytes can be used.
219	*/
220	static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
221	{
222	int i, needed_bytes = ebml_num_size(num);
223
224	// sizes larger than this are currently undefined in EBML
225	av_assert0(num < (1ULL << 56) - 1);
226
227	if (bytes == 0)
228	// don't care how many bytes are used, so use the min
229	bytes = needed_bytes;
230	// the bytes needed to write the given size would exceed the bytes
231	// that we need to use, so write unknown size. This shouldn't happen.
232	av_assert0(bytes >= needed_bytes);
233
234	num |= 1ULL << bytes * 7;
235	for (i = bytes - 1; i >= 0; i--)
236	avio_w8(pb, (uint8_t)(num >> i * 8));
237	}
238
239	static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
240	{
241	int i, bytes = 1;
242	uint64_t tmp = val;
243	while (tmp >>= 8)
244	bytes++;
245
246	put_ebml_id(pb, elementid);
247	put_ebml_num(pb, bytes, 0);
248	for (i = bytes - 1; i >= 0; i--)
249	avio_w8(pb, (uint8_t)(val >> i * 8));
250	}
251
252	static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val)
253	{
254	int i, bytes = 1;
255	uint64_t tmp = 2*(val < 0 ? val^-1 : val);
256
257	while (tmp>>=8) bytes++;
258
259	put_ebml_id(pb, elementid);
260	put_ebml_num(pb, bytes, 0);
261	for (i = bytes - 1; i >= 0; i--)
262	avio_w8(pb, (uint8_t)(val >> i * 8));
263	}
264
265	static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
266	{
267	put_ebml_id(pb, elementid);
268	put_ebml_num(pb, 8, 0);
269	avio_wb64(pb, av_double2int(val));
270	}
271
272	static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
273	const void *buf, int size)
274	{
275	put_ebml_id(pb, elementid);
276	put_ebml_num(pb, size, 0);
277	avio_write(pb, buf, size);
278	}
279
280	static void put_ebml_string(AVIOContext *pb, unsigned int elementid,
281	const char *str)
282	{
283	put_ebml_binary(pb, elementid, str, strlen(str));
284	}
285
286	/**
287	* Write a void element of a given size. Useful for reserving space in
288	* the file to be written to later.
289	*
290	* @param size The number of bytes to reserve, which must be at least 2.
291	*/
292	static void put_ebml_void(AVIOContext *pb, uint64_t size)
293	{
294	int64_t currentpos = avio_tell(pb);
295
296	av_assert0(size >= 2);
297
298	put_ebml_id(pb, EBML_ID_VOID);
299	// we need to subtract the length needed to store the size from the
300	// size we need to reserve so 2 cases, we use 8 bytes to store the
301	// size if possible, 1 byte otherwise
302	if (size < 10)
303	put_ebml_num(pb, size - 2, 0);
304	else
305	put_ebml_num(pb, size - 9, 8);
306	ffio_fill(pb, 0, currentpos + size - avio_tell(pb));
307	}
308
309	static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid,
310	uint64_t expectedsize)
311	{
312	int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
313	put_ebml_id(pb, elementid);
314	put_ebml_size_unknown(pb, bytes);
315	return (ebml_master) {avio_tell(pb), bytes };
316	}
317
318	static void end_ebml_master(AVIOContext *pb, ebml_master master)
319	{
320	int64_t pos = avio_tell(pb);
321
322	if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
323	return;
324	put_ebml_num(pb, pos - master.pos, master.sizebytes);
325	avio_seek(pb, pos, SEEK_SET);
326	}
327
328	static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
329	ebml_master *master, unsigned int elementid, uint64_t expectedsize)
330	{
331	int ret;
332
333	if ((ret = avio_open_dyn_buf(dyn_cp)) < 0)
334	return ret;
335
336	if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
337	*master = start_ebml_master(pb, elementid, expectedsize);
338	if (mkv->write_crc && mkv->mode != MODE_WEBM)
339	put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */
340	} else
341	*master = start_ebml_master(*dyn_cp, elementid, expectedsize);
342
343	return 0;
344	}
345
346	static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
347	ebml_master master)
348	{
349	uint8_t *buf, crc[4];
350	int size, skip = 0;
351
352	if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
353	size = avio_close_dyn_buf(*dyn_cp, &buf);
354	if (mkv->write_crc && mkv->mode != MODE_WEBM) {
355	skip = 6; /* Skip reserved 6-byte long void element from the dynamic buffer. */
356	AV_WL32(crc, av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), UINT32_MAX, buf + skip, size - skip) ^ UINT32_MAX);
357	put_ebml_binary(pb, EBML_ID_CRC32, crc, sizeof(crc));
358	}
359	avio_write(pb, buf + skip, size - skip);
360	end_ebml_master(pb, master);
361	} else {
362	end_ebml_master(*dyn_cp, master);
363	size = avio_close_dyn_buf(*dyn_cp, &buf);
364	avio_write(pb, buf, size);
365	}
366	av_free(buf);
367	*dyn_cp = NULL;
368	}
369
370	/**
371	* Complete ebml master whithout destroying the buffer, allowing for later updates
372	*/
373	static void end_ebml_master_crc32_preliminary(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
374	ebml_master master)
375	{
376	if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
377
378	uint8_t *buf;
379	int size = avio_get_dyn_buf(*dyn_cp, &buf);
380
381	avio_write(pb, buf, size);
382	end_ebml_master(pb, master);
383	}
384	}
385
386	static void put_xiph_size(AVIOContext *pb, int size)
387	{
388	ffio_fill(pb, 255, size / 255);
389	avio_w8(pb, size % 255);
390	}
391
392	/**
393	* Free the members allocated in the mux context.
394	*/
395	static void mkv_free(MatroskaMuxContext *mkv) {
396	uint8_t* buf;
397	if (mkv->dyn_bc) {
398	avio_close_dyn_buf(mkv->dyn_bc, &buf);
399	av_free(buf);
400	}
401	if (mkv->info_bc) {
402	avio_close_dyn_buf(mkv->info_bc, &buf);
403	av_free(buf);
404	}
405	if (mkv->tracks_bc) {
406	avio_close_dyn_buf(mkv->tracks_bc, &buf);
407	av_free(buf);
408	}
409	if (mkv->tags_bc) {
410	avio_close_dyn_buf(mkv->tags_bc, &buf);
411	av_free(buf);
412	}
413	if (mkv->main_seekhead) {
414	av_freep(&mkv->main_seekhead->entries);
415	av_freep(&mkv->main_seekhead);
416	}
417	if (mkv->cues) {
418	av_freep(&mkv->cues->entries);
419	av_freep(&mkv->cues);
420	}
421	if (mkv->attachments) {
422	av_freep(&mkv->attachments->entries);
423	av_freep(&mkv->attachments);
424	}
425	av_freep(&mkv->tracks);
426	av_freep(&mkv->stream_durations);
427	av_freep(&mkv->stream_duration_offsets);
428	}
429
430	/**
431	* Initialize a mkv_seekhead element to be ready to index level 1 Matroska
432	* elements. If a maximum number of elements is specified, enough space
433	* will be reserved at the current file location to write a seek head of
434	* that size.
435	*
436	* @param segment_offset The absolute offset to the position in the file
437	* where the segment begins.
438	* @param numelements The maximum number of elements that will be indexed
439	* by this seek head, 0 if unlimited.
440	*/
441	static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
442	int numelements)
443	{
444	mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
445	if (!new_seekhead)
446	return NULL;
447
448	new_seekhead->segment_offset = segment_offset;
449
450	if (numelements > 0) {
451	new_seekhead->filepos = avio_tell(pb);
452	// 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
453	// and size, 6 bytes for a CRC32 element, and 3 bytes to guarantee
454	// that an EBML void element will fit afterwards
455	new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 19;
456	new_seekhead->max_entries = numelements;
457	put_ebml_void(pb, new_seekhead->reserved_size);
458	}
459	return new_seekhead;
460	}
461
462	static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
463	{
464	mkv_seekhead_entry *entries = seekhead->entries;
465
466	// don't store more elements than we reserved space for
467	if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
468	return -1;
469
470	entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
471	if (!entries)
472	return AVERROR(ENOMEM);
473	seekhead->entries = entries;
474
475	seekhead->entries[seekhead->num_entries].elementid = elementid;
476	seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
477
478	return 0;
479	}
480
481	/**
482	* Write the seek head to the file and free it. If a maximum number of
483	* elements was specified to mkv_start_seekhead(), the seek head will
484	* be written at the location reserved for it. Otherwise, it is written
485	* at the current location in the file.
486	*
487	* @return The file offset where the seekhead was written,
488	* -1 if an error occurred.
489	*/
490	static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
491	{
492	AVIOContext *dyn_cp;
493	mkv_seekhead *seekhead = mkv->main_seekhead;
494	ebml_master metaseek, seekentry;
495	int64_t currentpos;
496	int i;
497
498	currentpos = avio_tell(pb);
499
500	if (seekhead->reserved_size > 0) {
501	if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {
502	currentpos = -1;
503	goto fail;
504	}
505	}
506
507	if (start_ebml_master_crc32(pb, &dyn_cp, mkv, &metaseek, MATROSKA_ID_SEEKHEAD,
508	seekhead->reserved_size) < 0) {
509	currentpos = -1;
510	goto fail;
511	}
512
513	for (i = 0; i < seekhead->num_entries; i++) {
514	mkv_seekhead_entry *entry = &seekhead->entries[i];
515
516	seekentry = start_ebml_master(dyn_cp, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
517
518	put_ebml_id(dyn_cp, MATROSKA_ID_SEEKID);
519	put_ebml_num(dyn_cp, ebml_id_size(entry->elementid), 0);
520	put_ebml_id(dyn_cp, entry->elementid);
521
522	put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
523	end_ebml_master(dyn_cp, seekentry);
524	}
525	end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
526
527	if (seekhead->reserved_size > 0) {
528	uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
529	put_ebml_void(pb, remaining);
530	avio_seek(pb, currentpos, SEEK_SET);
531
532	currentpos = seekhead->filepos;
533	}
534	fail:
535	av_freep(&mkv->main_seekhead->entries);
536	av_freep(&mkv->main_seekhead);
537
538	return currentpos;
539	}
540
541	static mkv_cues *mkv_start_cues(int64_t segment_offset)
542	{
543	mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
544	if (!cues)
545	return NULL;
546
547	cues->segment_offset = segment_offset;
548	return cues;
549	}
550
551	static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts,
552	int64_t cluster_pos, int64_t relative_pos, int64_t duration)
553	{
554	mkv_cuepoint *entries = cues->entries;
555
556	if (ts < 0)
557	return 0;
558
559	entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
560	if (!entries)
561	return AVERROR(ENOMEM);
562	cues->entries = entries;
563
564	cues->entries[cues->num_entries].pts = ts;
565	cues->entries[cues->num_entries].stream_idx = stream;
566	cues->entries[cues->num_entries].tracknum = tracknum;
567	cues->entries[cues->num_entries].cluster_pos = cluster_pos - cues->segment_offset;
568	cues->entries[cues->num_entries].relative_pos = relative_pos;
569	cues->entries[cues->num_entries++].duration = duration;
570
571	return 0;
572	}
573
574	static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tracks, int num_tracks)
575	{
576	MatroskaMuxContext *mkv = s->priv_data;
577	AVIOContext *dyn_cp, *pb = s->pb;
578	ebml_master cues_element;
579	int64_t currentpos;
580	int i, j, ret;
581
582	currentpos = avio_tell(pb);
583	ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &cues_element, MATROSKA_ID_CUES, 0);
584	if (ret < 0)
585	return ret;
586
587	for (i = 0; i < cues->num_entries; i++) {
588	ebml_master cuepoint, track_positions;
589	mkv_cuepoint *entry = &cues->entries[i];
590	uint64_t pts = entry->pts;
591	int ctp_nb = 0;
592
593	// Calculate the number of entries, so we know the element size
594	for (j = 0; j < num_tracks; j++)
595	tracks[j].has_cue = 0;
596	for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
597	int tracknum = entry[j].stream_idx;
598	av_assert0(tracknum>=0 && tracknum<num_tracks);
599	if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
600	continue;
601	tracks[tracknum].has_cue = 1;
602	ctp_nb ++;
603	}
604
605	cuepoint = start_ebml_master(dyn_cp, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(ctp_nb));
606	put_ebml_uint(dyn_cp, MATROSKA_ID_CUETIME, pts);
607
608	// put all the entries from different tracks that have the exact same
609	// timestamp into the same CuePoint
610	for (j = 0; j < num_tracks; j++)
611	tracks[j].has_cue = 0;
612	for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
613	int tracknum = entry[j].stream_idx;
614	av_assert0(tracknum>=0 && tracknum<num_tracks);
615	if (tracks[tracknum].has_cue && s->streams[tracknum]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
616	continue;
617	tracks[tracknum].has_cue = 1;
618	track_positions = start_ebml_master(dyn_cp, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
619	put_ebml_uint(dyn_cp, MATROSKA_ID_CUETRACK , entry[j].tracknum );
620	put_ebml_uint(dyn_cp, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);
621	put_ebml_uint(dyn_cp, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);
622	if (entry[j].duration != -1)
623	put_ebml_uint(dyn_cp, MATROSKA_ID_CUEDURATION , entry[j].duration);
624	end_ebml_master(dyn_cp, track_positions);
625	}
626	i += j - 1;
627	end_ebml_master(dyn_cp, cuepoint);
628	}
629	end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
630
631	return currentpos;
632	}
633
634	static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
635	{
636	const uint8_t *header_start[3];
637	int header_len[3];
638	int first_header_size;
639	int j;
640
641	if (par->codec_id == AV_CODEC_ID_VORBIS)
642	first_header_size = 30;
643	else
644	first_header_size = 42;
645
646	if (avpriv_split_xiph_headers(par->extradata, par->extradata_size,
647	first_header_size, header_start, header_len) < 0) {
648	av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
649	return -1;
650	}
651
652	avio_w8(pb, 2); // number packets - 1
653	for (j = 0; j < 2; j++) {
654	put_xiph_size(pb, header_len[j]);
655	}
656	for (j = 0; j < 3; j++)
657	avio_write(pb, header_start[j], header_len[j]);
658
659	return 0;
660	}
661
662	static int put_wv_codecpriv(AVIOContext *pb, AVCodecParameters *par)
663	{
664	if (par->extradata && par->extradata_size == 2)
665	avio_write(pb, par->extradata, 2);
666	else
667	avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs
668	return 0;
669	}
670
671	static int put_flac_codecpriv(AVFormatContext *s,
672	AVIOContext *pb, AVCodecParameters *par)
673	{
674	int write_comment = (par->channel_layout &&
675	!(par->channel_layout & ~0x3ffffULL) &&
676	!ff_flac_is_native_layout(par->channel_layout));
677	int ret = ff_flac_write_header(pb, par->extradata, par->extradata_size,
678	!write_comment);
679
680	if (ret < 0)
681	return ret;
682
683	if (write_comment) {
684	const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
685	"Lavf" : LIBAVFORMAT_IDENT;
686	AVDictionary *dict = NULL;
687	uint8_t buf[32], *data, *p;
688	int64_t len;
689
690	snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
691	av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
692
693	len = ff_vorbiscomment_length(dict, vendor);
694	if (len >= ((1<<24) - 4))
695	return AVERROR(EINVAL);
696
697	data = av_malloc(len + 4);
698	if (!data) {
699	av_dict_free(&dict);
700	return AVERROR(ENOMEM);
701	}
702
703	data[0] = 0x84;
704	AV_WB24(data + 1, len);
705
706	p = data + 4;
707	ff_vorbiscomment_write(&p, &dict, vendor);
708
709	avio_write(pb, data, len + 4);
710
711	av_freep(&data);
712	av_dict_free(&dict);
713	}
714
715	return 0;
716	}
717
718	static int get_aac_sample_rates(AVFormatContext *s, AVCodecParameters *par,
719	int *sample_rate, int *output_sample_rate)
720	{
721	MPEG4AudioConfig mp4ac;
722
723	if (avpriv_mpeg4audio_get_config(&mp4ac, par->extradata,
724	par->extradata_size * 8, 1) < 0) {
725	av_log(s, AV_LOG_ERROR,
726	"Error parsing AAC extradata, unable to determine samplerate.\n");
727	return AVERROR(EINVAL);
728	}
729
730	*sample_rate = mp4ac.sample_rate;
731	*output_sample_rate = mp4ac.ext_sample_rate;
732	return 0;
733	}
734
735	static int mkv_write_native_codecprivate(AVFormatContext *s,
736	AVCodecParameters *par,
737	AVIOContext *dyn_cp)
738	{
739	switch (par->codec_id) {
740	case AV_CODEC_ID_VORBIS:
741	case AV_CODEC_ID_THEORA:
742	return put_xiph_codecpriv(s, dyn_cp, par);
743	case AV_CODEC_ID_FLAC:
744	return put_flac_codecpriv(s, dyn_cp, par);
745	case AV_CODEC_ID_WAVPACK:
746	return put_wv_codecpriv(dyn_cp, par);
747	case AV_CODEC_ID_H264:
748	return ff_isom_write_avcc(dyn_cp, par->extradata,
749	par->extradata_size);
750	case AV_CODEC_ID_HEVC:
751	ff_isom_write_hvcc(dyn_cp, par->extradata,
752	par->extradata_size, 0);
753	return 0;
754	case AV_CODEC_ID_ALAC:
755	if (par->extradata_size < 36) {
756	av_log(s, AV_LOG_ERROR,
757	"Invalid extradata found, ALAC expects a 36-byte "
758	"QuickTime atom.");
759	return AVERROR_INVALIDDATA;
760	} else
761	avio_write(dyn_cp, par->extradata + 12,
762	par->extradata_size - 12);
763	break;
764	default:
765	if (par->codec_id == AV_CODEC_ID_PRORES &&
766	ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == AV_CODEC_ID_PRORES) {
767	avio_wl32(dyn_cp, par->codec_tag);
768	} else if (par->extradata_size && par->codec_id != AV_CODEC_ID_TTA)
769	avio_write(dyn_cp, par->extradata, par->extradata_size);
770	}
771
772	return 0;
773	}
774
775	static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
776	AVCodecParameters *par,
777	int native_id, int qt_id)
778	{
779	AVIOContext *dyn_cp;
780	uint8_t *codecpriv;
781	int ret, codecpriv_size;
782
783	ret = avio_open_dyn_buf(&dyn_cp);
784	if (ret < 0)
785	return ret;
786
787	if (native_id) {
788	ret = mkv_write_native_codecprivate(s, par, dyn_cp);
789	} else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
790	if (qt_id) {
791	if (!par->codec_tag)
792	par->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags,
793	par->codec_id);
794	if ( ff_codec_get_id(ff_codec_movvideo_tags, par->codec_tag) == par->codec_id
795	&& (!par->extradata_size || ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(par->extradata + 4)) != par->codec_id)
796	) {
797	int i;
798	avio_wb32(dyn_cp, 0x5a + par->extradata_size);
799	avio_wl32(dyn_cp, par->codec_tag);
800	for(i = 0; i < 0x5a - 8; i++)
801	avio_w8(dyn_cp, 0);
802	}
803	avio_write(dyn_cp, par->extradata, par->extradata_size);
804	} else {
805	if (!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id))
806	av_log(s, AV_LOG_WARNING, "codec %s is not supported by this format\n",
807	avcodec_get_name(par->codec_id));
808
809	if (!par->codec_tag)
810	par->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags,
811	par->codec_id);
812	if (!par->codec_tag && par->codec_id != AV_CODEC_ID_RAWVIDEO) {
813	av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",
814	avcodec_get_name(par->codec_id));
815	ret = AVERROR(EINVAL);
816	}
817
818	ff_put_bmp_header(dyn_cp, par, ff_codec_bmp_tags, 0, 0);
819	}
820	} else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
821	unsigned int tag;
822	tag = ff_codec_get_tag(ff_codec_wav_tags, par->codec_id);
823	if (!tag) {
824	av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",
825	avcodec_get_name(par->codec_id));
826	ret = AVERROR(EINVAL);
827	}
828	if (!par->codec_tag)
829	par->codec_tag = tag;
830
831	ff_put_wav_header(s, dyn_cp, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
832	}
833
834	codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
835	if (codecpriv_size)
836	put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv,
837	codecpriv_size);
838	av_free(codecpriv);
839	return ret;
840	}
841
842	static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStream *st) {
843	AVIOContext *dyn_cp;
844	uint8_t *colorinfo_ptr;
845	int side_data_size = 0;
846	int ret, colorinfo_size;
847	const uint8_t *side_data = av_stream_get_side_data(
848	st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA, &side_data_size);
849
850	ret = avio_open_dyn_buf(&dyn_cp);
851	if (ret < 0)
852	return ret;
853
854	if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
855	par->color_trc < AVCOL_TRC_NB) {
856	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS,
857	par->color_trc);
858	}
859	if (par->color_space != AVCOL_SPC_UNSPECIFIED &&
860	par->color_space < AVCOL_SPC_NB) {
861	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, par->color_space);
862	}
863	if (par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
864	par->color_primaries < AVCOL_PRI_NB) {
865	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORPRIMARIES, par->color_primaries);
866	}
867	if (par->color_range != AVCOL_RANGE_UNSPECIFIED &&
868	par->color_range < AVCOL_RANGE_NB) {
869	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORRANGE, par->color_range);
870	}
871	if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED &&
872	par->chroma_location <= AVCHROMA_LOC_TOP) {
873	int xpos, ypos;
874
875	avcodec_enum_to_chroma_pos(&xpos, &ypos, par->chroma_location);
876	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, (xpos >> 7) + 1);
877	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, (ypos >> 7) + 1);
878	}
879	if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
880	ebml_master meta_element = start_ebml_master(
881	dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
882	const AVMasteringDisplayMetadata *metadata =
883	(const AVMasteringDisplayMetadata*)side_data;
884	if (metadata->has_primaries) {
885	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RX,
886	av_q2d(metadata->display_primaries[0][0]));
887	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_RY,
888	av_q2d(metadata->display_primaries[0][1]));
889	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GX,
890	av_q2d(metadata->display_primaries[1][0]));
891	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_GY,
892	av_q2d(metadata->display_primaries[1][1]));
893	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BX,
894	av_q2d(metadata->display_primaries[2][0]));
895	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_BY,
896	av_q2d(metadata->display_primaries[2][1]));
897	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEX,
898	av_q2d(metadata->white_point[0]));
899	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_WHITEY,
900	av_q2d(metadata->white_point[1]));
901	}
902	if (metadata->has_luminance) {
903	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX,
904	av_q2d(metadata->max_luminance));
905	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN,
906	av_q2d(metadata->min_luminance));
907	}
908	end_ebml_master(dyn_cp, meta_element);
909	}
910
911	colorinfo_size = avio_close_dyn_buf(dyn_cp, &colorinfo_ptr);
912	if (colorinfo_size) {
913	ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, colorinfo_size);
914	avio_write(pb, colorinfo_ptr, colorinfo_size);
915	end_ebml_master(pb, colorinfo);
916	}
917	av_free(colorinfo_ptr);
918	return 0;
919	}
920
921	static int mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb, AVStream *st)
922	{
923	int side_data_size = 0;
924	const AVSphericalMapping *spherical =
925	(const AVSphericalMapping*) av_stream_get_side_data(st, AV_PKT_DATA_SPHERICAL,
926	&side_data_size);
927
928	if (side_data_size) {
929	AVIOContext *dyn_cp;
930	uint8_t *projection_ptr;
931	int ret, projection_size;
932
933	ret = avio_open_dyn_buf(&dyn_cp);
934	if (ret < 0)
935	return ret;
936
937	switch (spherical->projection) {
938	case AV_SPHERICAL_EQUIRECTANGULAR:
939	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
940	MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
941	break;
942	case AV_SPHERICAL_EQUIRECTANGULAR_TILE:
943	{
944	AVIOContext b;
945	uint8_t private[20];
946	ffio_init_context(&b, private, sizeof(private),
947	1, NULL, NULL, NULL, NULL);
948	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
949	MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR);
950	avio_wb32(&b, 0); // version + flags
951	avio_wb32(&b, spherical->bound_top);
952	avio_wb32(&b, spherical->bound_bottom);
953	avio_wb32(&b, spherical->bound_left);
954	avio_wb32(&b, spherical->bound_right);
955	put_ebml_binary(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPRIVATE, private, sizeof(private));
956	break;
957	}
958	case AV_SPHERICAL_CUBEMAP:
959	{
960	AVIOContext b;
961	uint8_t private[12];
962	ffio_init_context(&b, private, sizeof(private),
963	1, NULL, NULL, NULL, NULL);
964	put_ebml_uint(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONTYPE,
965	MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP);
966	avio_wb32(&b, 0); // version + flags
967	avio_wb32(&b, 0); // layout
968	avio_wb32(&b, spherical->padding);
969	put_ebml_binary(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPRIVATE, private, sizeof(private));
970	break;
971	}
972	default:
973	av_log(s, AV_LOG_WARNING, "Unknown projection type\n");
974	goto end;
975	}
976
977	if (spherical->yaw)
978	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, (double)spherical->yaw / (1 << 16));
979	if (spherical->pitch)
980	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, (double)spherical->pitch / (1 << 16));
981	if (spherical->roll)
982	put_ebml_float(dyn_cp, MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, (double)spherical->roll / (1 << 16));
983
984	end:
985	projection_size = avio_close_dyn_buf(dyn_cp, &projection_ptr);
986	if (projection_size) {
987	ebml_master projection = start_ebml_master(pb, MATROSKA_ID_VIDEOPROJECTION, projection_size);
988	avio_write(pb, projection_ptr, projection_size);
989	end_ebml_master(pb, projection);
990	}
991	av_freep(&projection_ptr);
992	}
993
994	return 0;
995	}
996
997	static void mkv_write_field_order(AVIOContext *pb, int mode,
998	enum AVFieldOrder field_order)
999	{
1000	switch (field_order) {
1001	case AV_FIELD_UNKNOWN:
1002	break;
1003	case AV_FIELD_PROGRESSIVE:
1004	put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1005	MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE);
1006	break;
1007	case AV_FIELD_TT:
1008	case AV_FIELD_BB:
1009	case AV_FIELD_TB:
1010	case AV_FIELD_BT:
1011	put_ebml_uint(pb, MATROSKA_ID_VIDEOFLAGINTERLACED,
1012	MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED);
1013	if (mode != MODE_WEBM) {
1014	switch (field_order) {
1015	case AV_FIELD_TT:
1016	put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1017	MATROSKA_VIDEO_FIELDORDER_TT);
1018	break;
1019	case AV_FIELD_BB:
1020	put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1021	MATROSKA_VIDEO_FIELDORDER_BB);
1022	break;
1023	case AV_FIELD_TB:
1024	put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1025	MATROSKA_VIDEO_FIELDORDER_TB);
1026	break;
1027	case AV_FIELD_BT:
1028	put_ebml_uint(pb, MATROSKA_ID_VIDEOFIELDORDER,
1029	MATROSKA_VIDEO_FIELDORDER_BT);
1030	break;
1031	}
1032	}
1033	}
1034	}
1035
1036	static int mkv_write_stereo_mode(AVFormatContext *s, AVIOContext *pb,
1037	AVStream *st, int mode, int *h_width, int *h_height)
1038	{
1039	int i;
1040	int ret = 0;
1041	AVDictionaryEntry *tag;
1042	MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1043
1044	*h_width = 1;
1045	*h_height = 1;
1046	// convert metadata into proper side data and add it to the stream
1047	if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
1048	(tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
1049	int stereo_mode = atoi(tag->value);
1050
1051	for (i=0; i<MATROSKA_VIDEO_STEREOMODE_TYPE_NB; i++)
1052	if (!strcmp(tag->value, ff_matroska_video_stereo_mode[i])){
1053	stereo_mode = i;
1054	break;
1055	}
1056
1057	if (stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1058	stereo_mode != 10 && stereo_mode != 12) {
1059	int ret = ff_mkv_stereo3d_conv(st, stereo_mode);
1060	if (ret < 0)
1061	return ret;
1062	}
1063	}
1064
1065	// iterate to find the stereo3d side data
1066	for (i = 0; i < st->nb_side_data; i++) {
1067	AVPacketSideData sd = st->side_data[i];
1068	if (sd.type == AV_PKT_DATA_STEREO3D) {
1069	AVStereo3D *stereo = (AVStereo3D *)sd.data;
1070
1071	switch (stereo->type) {
1072	case AV_STEREO3D_2D:
1073	format = MATROSKA_VIDEO_STEREOMODE_TYPE_MONO;
1074	break;
1075	case AV_STEREO3D_SIDEBYSIDE:
1076	format = (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1077	? MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT
1078	: MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT;
1079	*h_width = 2;
1080	break;
1081	case AV_STEREO3D_TOPBOTTOM:
1082	format = MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM;
1083	if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1084	format--;
1085	*h_height = 2;
1086	break;
1087	case AV_STEREO3D_CHECKERBOARD:
1088	format = MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR;
1089	if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1090	format--;
1091	break;
1092	case AV_STEREO3D_LINES:
1093	format = MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR;
1094	if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1095	format--;
1096	*h_height = 2;
1097	break;
1098	case AV_STEREO3D_COLUMNS:
1099	format = MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR;
1100	if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1101	format--;
1102	*h_width = 2;
1103	break;
1104	case AV_STEREO3D_FRAMESEQUENCE:
1105	format = MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR;
1106	if (stereo->flags & AV_STEREO3D_FLAG_INVERT)
1107	format++;
1108	break;
1109	}
1110	break;
1111	}
1112	}
1113
1114	if (format == MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1115	return ret;
1116
1117	// if webm, do not write unsupported modes
1118	if ((mode == MODE_WEBM &&
1119	format > MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM &&
1120	format != MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT)
1121	|| format >= MATROSKA_VIDEO_STEREOMODE_TYPE_NB) {
1122	av_log(s, AV_LOG_ERROR,
1123	"The specified stereo mode is not valid.\n");
1124	format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;
1125	return AVERROR(EINVAL);
1126	}
1127
1128	// write StereoMode if format is valid
1129	put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, format);
1130
1131	return ret;
1132	}
1133
1134	static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
1135	int i, AVIOContext *pb, int default_stream_exists)
1136	{
1137	AVStream *st = s->streams[i];
1138	AVCodecParameters *par = st->codecpar;
1139	ebml_master subinfo, track;
1140	int native_id = 0;
1141	int qt_id = 0;
1142	int bit_depth = av_get_bits_per_sample(par->codec_id);
1143	int sample_rate = par->sample_rate;
1144	int output_sample_rate = 0;
1145	int display_width_div = 1;
1146	int display_height_div = 1;
1147	int j, ret;
1148	AVDictionaryEntry *tag;
1149
1150	if (par->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
1151	mkv->have_attachments = 1;
1152	return 0;
1153	}
1154
1155	if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
1156	if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
1157	if (par->bits_per_raw_sample)
1158	bit_depth = par->bits_per_raw_sample;
1159	else
1160	bit_depth = av_get_bytes_per_sample(par->format) << 3;
1161	}
1162	if (!bit_depth)
1163	bit_depth = par->bits_per_coded_sample;
1164	}
1165
1166	if (par->codec_id == AV_CODEC_ID_AAC) {
1167	ret = get_aac_sample_rates(s, par, &sample_rate, &output_sample_rate);
1168	if (ret < 0)
1169	return ret;
1170	}
1171
1172	track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
1173	put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
1174	mkv->is_dash ? mkv->dash_track_number : i + 1);
1175	put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
1176	mkv->is_dash ? mkv->dash_track_number : i + 1);
1177	put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
1178
1179	if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
1180	put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
1181	tag = av_dict_get(st->metadata, "language", NULL, 0);
1182	if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1183	put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag && tag->value ? tag->value:"und");
1184	} else if (tag && tag->value) {
1185	put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);
1186	}
1187
1188	// The default value for TRACKFLAGDEFAULT is 1, so add element
1189	// if we need to clear it.
1190	if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))
1191	put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
1192
1193	if (st->disposition & AV_DISPOSITION_FORCED)
1194	put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);
1195
1196	if (mkv->mode == MODE_WEBM && par->codec_id == AV_CODEC_ID_WEBVTT) {
1197	const char *codec_id;
1198	if (st->disposition & AV_DISPOSITION_CAPTIONS) {
1199	codec_id = "D_WEBVTT/CAPTIONS";
1200	native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1201	} else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {
1202	codec_id = "D_WEBVTT/DESCRIPTIONS";
1203	native_id = MATROSKA_TRACK_TYPE_METADATA;
1204	} else if (st->disposition & AV_DISPOSITION_METADATA) {
1205	codec_id = "D_WEBVTT/METADATA";
1206	native_id = MATROSKA_TRACK_TYPE_METADATA;
1207	} else {
1208	codec_id = "D_WEBVTT/SUBTITLES";
1209	native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1210	}
1211	put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);
1212	} else {
1213	// look for a codec ID string specific to mkv to use,
1214	// if none are found, use AVI codes
1215	if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {
1216	for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1217	if (ff_mkv_codec_tags[j].id == par->codec_id && par->codec_id != AV_CODEC_ID_FFV1) {
1218	put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
1219	native_id = 1;
1220	break;
1221	}
1222	}
1223	} else {
1224	if (mkv->allow_raw_vfw) {
1225	native_id = 0;
1226	} else {
1227	av_log(s, AV_LOG_ERROR, "Raw RGB is not supported Natively in Matroska, you can use AVI or NUT or\n"
1228	"If you would like to store it anyway using VFW mode, enable allow_raw_vfw (-allow_raw_vfw 1)\n");
1229	return AVERROR(EINVAL);
1230	}
1231	}
1232	}
1233
1234	if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->initial_padding && par->codec_id == AV_CODEC_ID_OPUS) {
1235	int64_t codecdelay = av_rescale_q(par->initial_padding,
1236	(AVRational){ 1, 48000 },
1237	(AVRational){ 1, 1000000000 });
1238	if (codecdelay < 0) {
1239	av_log(s, AV_LOG_ERROR, "Initial padding is invalid\n");
1240	return AVERROR(EINVAL);
1241	}
1242	// mkv->tracks[i].ts_offset = av_rescale_q(par->initial_padding,
1243	// (AVRational){ 1, par->sample_rate },
1244	// st->time_base);
1245
1246	put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codecdelay);
1247	}
1248	if (par->codec_id == AV_CODEC_ID_OPUS) {
1249	put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);
1250	}
1251
1252	if (mkv->mode == MODE_WEBM && !(par->codec_id == AV_CODEC_ID_VP8 ||
1253	par->codec_id == AV_CODEC_ID_VP9 ||
1254	par->codec_id == AV_CODEC_ID_OPUS ||
1255	par->codec_id == AV_CODEC_ID_VORBIS ||
1256	par->codec_id == AV_CODEC_ID_WEBVTT)) {
1257	av_log(s, AV_LOG_ERROR,
1258	"Only VP8 or VP9 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.\n");
1259	return AVERROR(EINVAL);
1260	}
1261
1262	switch (par->codec_type) {
1263	case AVMEDIA_TYPE_VIDEO:
1264	mkv->have_video = 1;
1265	put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
1266
1267	if( st->avg_frame_rate.num > 0 && st->avg_frame_rate.den > 0
1268	&& av_cmp_q(av_inv_q(st->avg_frame_rate), st->time_base) > 0)
1269	put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->avg_frame_rate.den / st->avg_frame_rate.num);
1270	else
1271	put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1000000000LL * st->time_base.num / st->time_base.den);
1272
1273	if (!native_id &&
1274	ff_codec_get_tag(ff_codec_movvideo_tags, par->codec_id) &&
1275	((!ff_codec_get_tag(ff_codec_bmp_tags, par->codec_id) && par->codec_id != AV_CODEC_ID_RAWVIDEO) ||
1276	par->codec_id == AV_CODEC_ID_SVQ1 ||
1277	par->codec_id == AV_CODEC_ID_SVQ3 ||
1278	par->codec_id == AV_CODEC_ID_CINEPAK))
1279	qt_id = 1;
1280
1281	if (qt_id)
1282	put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
1283	else if (!native_id) {
1284	// if there is no mkv-specific codec ID, use VFW mode
1285	put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
1286	mkv->tracks[i].write_dts = 1;
1287	s->internal->avoid_negative_ts_use_pts = 0;
1288	}
1289
1290	subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
1291
1292	put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , par->width);
1293	put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, par->height);
1294
1295	mkv_write_field_order(pb, mkv->mode, par->field_order);
1296
1297	// check both side data and metadata for stereo information,
1298	// write the result to the bitstream if any is found
1299	ret = mkv_write_stereo_mode(s, pb, st, mkv->mode,
1300	&display_width_div,
1301	&display_height_div);
1302	if (ret < 0)
1303	return ret;
1304
1305	if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1306	((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
1307	(par->format == AV_PIX_FMT_YUVA420P)) {
1308	put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
1309	}
1310
1311	// write DisplayWidth and DisplayHeight, they contain the size of
1312	// a single source view and/or the display aspect ratio
1313	if (st->sample_aspect_ratio.num) {
1314	int64_t d_width = av_rescale(par->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
1315	if (d_width > INT_MAX) {
1316	av_log(s, AV_LOG_ERROR, "Overflow in display width\n");
1317	return AVERROR(EINVAL);
1318	}
1319	if (d_width != par->width || display_width_div != 1 || display_height_div != 1) {
1320	if (mkv->mode == MODE_WEBM || display_width_div != 1 || display_height_div != 1) {
1321	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);
1322	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1323	} else {
1324	AVRational display_aspect_ratio;
1325	av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
1326	par->width * (int64_t)st->sample_aspect_ratio.num,
1327	par->height * (int64_t)st->sample_aspect_ratio.den,
1328	1024 * 1024);
1329	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH, display_aspect_ratio.num);
1330	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, display_aspect_ratio.den);
1331	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_DAR);
1332	}
1333	}
1334	} else if (display_width_div != 1 || display_height_div != 1) {
1335	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , par->width / display_width_div);
1336	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, par->height / display_height_div);
1337	} else if (mkv->mode != MODE_WEBM)
1338	put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN);
1339
1340	if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
1341	uint32_t color_space = av_le2ne32(par->codec_tag);
1342	put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
1343	}
1344	ret = mkv_write_video_color(pb, par, st);
1345	if (ret < 0)
1346	return ret;
1347	ret = mkv_write_video_projection(s, pb, st);
1348	if (ret < 0)
1349	return ret;
1350	end_ebml_master(pb, subinfo);
1351	break;
1352
1353	case AVMEDIA_TYPE_AUDIO:
1354	put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
1355
1356	if (!native_id)
1357	// no mkv-specific ID, use ACM mode
1358	put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
1359
1360	subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
1361	put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , par->channels);
1362	put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
1363	if (output_sample_rate)
1364	put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
1365	if (bit_depth)
1366	put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
1367	end_ebml_master(pb, subinfo);
1368	break;
1369
1370	case AVMEDIA_TYPE_SUBTITLE:
1371	if (!native_id) {
1372	av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
1373	return AVERROR(ENOSYS);
1374	}
1375
1376	if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
1377	native_id = MATROSKA_TRACK_TYPE_SUBTITLE;
1378
1379	put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);
1380	break;
1381	default:
1382	av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
1383	return AVERROR(EINVAL);
1384	}
1385
1386	if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT) {
1387	mkv->tracks[i].codecpriv_offset = avio_tell(pb);
1388	ret = mkv_write_codecprivate(s, pb, par, native_id, qt_id);
1389	if (ret < 0)
1390	return ret;
1391	}
1392
1393	end_ebml_master(pb, track);
1394
1395	return 0;
1396	}
1397
1398	static int mkv_write_tracks(AVFormatContext *s)
1399	{
1400	MatroskaMuxContext *mkv = s->priv_data;
1401	AVIOContext *pb = s->pb;
1402	int i, ret, default_stream_exists = 0;
1403
1404	ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
1405	if (ret < 0)
1406	return ret;
1407
1408	ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, &mkv->tracks_master, MATROSKA_ID_TRACKS, 0);
1409	if (ret < 0)
1410	return ret;
1411
1412	for (i = 0; i < s->nb_streams; i++) {
1413	AVStream *st = s->streams[i];
1414	default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
1415	}
1416	for (i = 0; i < s->nb_streams; i++) {
1417	ret = mkv_write_track(s, mkv, i, mkv->tracks_bc, default_stream_exists);
1418	if (ret < 0)
1419	return ret;
1420	}
1421
1422	if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1423	end_ebml_master_crc32_preliminary(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
1424	else
1425	end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
1426
1427	return 0;
1428	}
1429
1430	static int mkv_write_chapters(AVFormatContext *s)
1431	{
1432	MatroskaMuxContext *mkv = s->priv_data;
1433	AVIOContext *dyn_cp, *pb = s->pb;
1434	ebml_master chapters, editionentry;
1435	AVRational scale = {1, 1E9};
1436	int i, ret;
1437
1438	if (!s->nb_chapters || mkv->wrote_chapters)
1439	return 0;
1440
1441	ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
1442	if (ret < 0) return ret;
1443
1444	ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &chapters, MATROSKA_ID_CHAPTERS, 0);
1445	if (ret < 0) return ret;
1446
1447	editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
1448	put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
1449	put_ebml_uint(dyn_cp, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
1450	for (i = 0; i < s->nb_chapters; i++) {
1451	ebml_master chapteratom, chapterdisplay;
1452	AVChapter *c = s->chapters[i];
1453	int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
1454	int64_t chapterend = av_rescale_q(c->end, c->time_base, scale);
1455	AVDictionaryEntry *t = NULL;
1456	if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
1457	av_log(s, AV_LOG_ERROR,
1458	"Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
1459	chapterstart, chapterend);
1460	return AVERROR_INVALIDDATA;
1461	}
1462
1463	chapteratom = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERATOM, 0);
1464	put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);
1465	put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMESTART, chapterstart);
1466	put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERTIMEEND, chapterend);
1467	put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
1468	put_ebml_uint(dyn_cp, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
1469	if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
1470	chapterdisplay = start_ebml_master(dyn_cp, MATROSKA_ID_CHAPTERDISPLAY, 0);
1471	put_ebml_string(dyn_cp, MATROSKA_ID_CHAPSTRING, t->value);
1472	put_ebml_string(dyn_cp, MATROSKA_ID_CHAPLANG , "und");
1473	end_ebml_master(dyn_cp, chapterdisplay);
1474	}
1475	end_ebml_master(dyn_cp, chapteratom);
1476	}
1477	end_ebml_master(dyn_cp, editionentry);
1478	end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
1479
1480	mkv->wrote_chapters = 1;
1481	return 0;
1482	}
1483
1484	static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
1485	{
1486	uint8_t *key = av_strdup(t->key);
1487	uint8_t *p = key;
1488	const uint8_t *lang = NULL;
1489	ebml_master tag;
1490
1491	if (!key)
1492	return AVERROR(ENOMEM);
1493
1494	if ((p = strrchr(p, '-')) &&
1495	(lang = ff_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
1496	*p = 0;
1497
1498	p = key;
1499	while (*p) {
1500	if (*p == ' ')
1501	*p = '_';
1502	else if (*p >= 'a' && *p <= 'z')
1503	*p -= 'a' - 'A';
1504	p++;
1505	}
1506
1507	tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1508	put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
1509	if (lang)
1510	put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
1511	put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
1512	end_ebml_master(pb, tag);
1513
1514	av_freep(&key);
1515	return 0;
1516	}
1517
1518	static int mkv_write_tag_targets(AVFormatContext *s,
1519	unsigned int elementid, unsigned int uid,
1520	ebml_master *tags, ebml_master* tag)
1521	{
1522	AVIOContext *pb;
1523	MatroskaMuxContext *mkv = s->priv_data;
1524	ebml_master targets;
1525	int ret;
1526
1527	if (!tags->pos) {
1528	ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
1529	if (ret < 0) return ret;
1530
1531	start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, tags, MATROSKA_ID_TAGS, 0);
1532	}
1533	pb = mkv->tags_bc;
1534
1535	*tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
1536	targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
1537	if (elementid)
1538	put_ebml_uint(pb, elementid, uid);
1539	end_ebml_master(pb, targets);
1540	return 0;
1541	}
1542
1543	static int mkv_check_tag_name(const char *name, unsigned int elementid)
1544	{
1545	return av_strcasecmp(name, "title") &&
1546	av_strcasecmp(name, "stereo_mode") &&
1547	av_strcasecmp(name, "creation_time") &&
1548	av_strcasecmp(name, "encoding_tool") &&
1549	av_strcasecmp(name, "duration") &&
1550	(elementid != MATROSKA_ID_TAGTARGETS_TRACKUID ||
1551	av_strcasecmp(name, "language")) &&
1552	(elementid != MATROSKA_ID_TAGTARGETS_ATTACHUID ||
1553	(av_strcasecmp(name, "filename") &&
1554	av_strcasecmp(name, "mimetype")));
1555	}
1556
1557	static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
1558	unsigned int uid, ebml_master *tags)
1559	{
1560	MatroskaMuxContext *mkv = s->priv_data;
1561	ebml_master tag;
1562	int ret;
1563	AVDictionaryEntry *t = NULL;
1564
1565	ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
1566	if (ret < 0)
1567	return ret;
1568
1569	while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
1570	if (mkv_check_tag_name(t->key, elementid)) {
1571	ret = mkv_write_simpletag(mkv->tags_bc, t);
1572	if (ret < 0)
1573	return ret;
1574	}
1575	}
1576
1577	end_ebml_master(mkv->tags_bc, tag);
1578	return 0;
1579	}
1580
1581	static int mkv_check_tag(AVDictionary *m, unsigned int elementid)
1582	{
1583	AVDictionaryEntry *t = NULL;
1584
1585	while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
1586	if (mkv_check_tag_name(t->key, elementid))
1587	return 1;
1588
1589	return 0;
1590	}
1591
1592	static int mkv_write_tags(AVFormatContext *s)
1593	{
1594	MatroskaMuxContext *mkv = s->priv_data;
1595	int i, ret;
1596
1597	ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
1598
1599	if (mkv_check_tag(s->metadata, 0)) {
1600	ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
1601	if (ret < 0) return ret;
1602	}
1603
1604	for (i = 0; i < s->nb_streams; i++) {
1605	AVStream *st = s->streams[i];
1606
1607	if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1608	continue;
1609
1610	if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
1611	continue;
1612
1613	ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
1614	if (ret < 0) return ret;
1615	}
1616
1617	if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
1618	for (i = 0; i < s->nb_streams; i++) {
1619	AVIOContext *pb;
1620	AVStream *st = s->streams[i];
1621	ebml_master tag_target;
1622	ebml_master tag;
1623
1624	if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
1625	continue;
1626
1627	mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
1628	pb = mkv->tags_bc;
1629
1630	tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
1631	put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
1632	mkv->stream_duration_offsets[i] = avio_tell(pb);
1633
1634	// Reserve space to write duration as a 20-byte string.
1635	// 2 (ebml id) + 1 (data size) + 20 (data)
1636	put_ebml_void(pb, 23);
1637	end_ebml_master(pb, tag);
1638	end_ebml_master(pb, tag_target);
1639	}
1640	}
1641
1642	for (i = 0; i < s->nb_chapters; i++) {
1643	AVChapter *ch = s->chapters[i];
1644
1645	if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
1646	continue;
1647
1648	ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
1649	if (ret < 0) return ret;
1650	}
1651
1652	if (mkv->have_attachments) {
1653	for (i = 0; i < mkv->attachments->num_entries; i++) {
1654	mkv_attachment *attachment = &mkv->attachments->entries[i];
1655	AVStream *st = s->streams[attachment->stream_idx];
1656
1657	if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
1658	continue;
1659
1660	ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid, &mkv->tags);
1661	if (ret < 0)
1662	return ret;
1663	}
1664	}
1665
1666	if (mkv->tags.pos) {
1667	if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1668	end_ebml_master_crc32_preliminary(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1669	else
1670	end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
1671	}
1672	return 0;
1673	}
1674
1675	static int mkv_write_attachments(AVFormatContext *s)
1676	{
1677	MatroskaMuxContext *mkv = s->priv_data;
1678	AVIOContext *dyn_cp, *pb = s->pb;
1679	ebml_master attachments;
1680	AVLFG c;
1681	int i, ret;
1682
1683	if (!mkv->have_attachments)
1684	return 0;
1685
1686	mkv->attachments = av_mallocz(sizeof(*mkv->attachments));
1687	if (!mkv->attachments)
1688	return AVERROR(ENOMEM);
1689
1690	av_lfg_init(&c, av_get_random_seed());
1691
1692	ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
1693	if (ret < 0) return ret;
1694
1695	ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &attachments, MATROSKA_ID_ATTACHMENTS, 0);
1696	if (ret < 0) return ret;
1697
1698	for (i = 0; i < s->nb_streams; i++) {
1699	AVStream *st = s->streams[i];
1700	ebml_master attached_file;
1701	mkv_attachment *attachment = mkv->attachments->entries;
1702	AVDictionaryEntry *t;
1703	const char *mimetype = NULL;
1704	uint32_t fileuid;
1705
1706	if (st->codecpar->codec_type != AVMEDIA_TYPE_ATTACHMENT)
1707	continue;
1708
1709	attachment = av_realloc_array(attachment, mkv->attachments->num_entries + 1, sizeof(mkv_attachment));
1710	if (!attachment)
1711	return AVERROR(ENOMEM);
1712	mkv->attachments->entries = attachment;
1713
1714	attached_file = start_ebml_master(dyn_cp, MATROSKA_ID_ATTACHEDFILE, 0);
1715
1716	if (t = av_dict_get(st->metadata, "title", NULL, 0))
1717	put_ebml_string(dyn_cp, MATROSKA_ID_FILEDESC, t->value);
1718	if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {
1719	av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);
1720	return AVERROR(EINVAL);
1721	}
1722	put_ebml_string(dyn_cp, MATROSKA_ID_FILENAME, t->value);
1723	if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))
1724	mimetype = t->value;
1725	else if (st->codecpar->codec_id != AV_CODEC_ID_NONE ) {
1726	int i;
1727	for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1728	if (ff_mkv_mime_tags[i].id == st->codecpar->codec_id) {
1729	mimetype = ff_mkv_mime_tags[i].str;
1730	break;
1731	}
1732	for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++)
1733	if (ff_mkv_image_mime_tags[i].id == st->codecpar->codec_id) {
1734	mimetype = ff_mkv_image_mime_tags[i].str;
1735	break;
1736	}
1737	}
1738	if (!mimetype) {
1739	av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "
1740	"it cannot be deduced from the codec id.\n", i);
1741	return AVERROR(EINVAL);
1742	}
1743
1744	if (s->flags & AVFMT_FLAG_BITEXACT) {
1745	struct AVSHA *sha = av_sha_alloc();
1746	uint8_t digest[20];
1747	if (!sha)
1748	return AVERROR(ENOMEM);
1749	av_sha_init(sha, 160);
1750	av_sha_update(sha, st->codecpar->extradata, st->codecpar->extradata_size);
1751	av_sha_final(sha, digest);
1752	av_free(sha);
1753	fileuid = AV_RL32(digest);
1754	} else {
1755	fileuid = av_lfg_get(&c);
1756	}
1757	av_log(s, AV_LOG_VERBOSE, "Using %.8"PRIx32" for attachment %d\n",
1758	fileuid, mkv->attachments->num_entries);
1759
1760	put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
1761	put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
1762	put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, fileuid);
1763	end_ebml_master(dyn_cp, attached_file);
1764
1765	mkv->attachments->entries[mkv->attachments->num_entries].stream_idx = i;
1766	mkv->attachments->entries[mkv->attachments->num_entries++].fileuid = fileuid;
1767	}
1768	end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
1769
1770	return 0;
1771	}
1772
1773	static int64_t get_metadata_duration(AVFormatContext *s)
1774	{
1775	int i = 0;
1776	int64_t max = 0;
1777	int64_t us;
1778
1779	AVDictionaryEntry *explicitDuration = av_dict_get(s->metadata, "DURATION", NULL, 0);
1780	if (explicitDuration && (av_parse_time(&us, explicitDuration->value, 1) == 0) && us > 0) {
1781	av_log(s, AV_LOG_DEBUG, "get_metadata_duration found duration in context metadata: %" PRId64 "\n", us);
1782	return us;
1783	}
1784
1785	for (i = 0; i < s->nb_streams; i++) {
1786	int64_t us;
1787	AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata, "DURATION", NULL, 0);
1788
1789	if (duration && (av_parse_time(&us, duration->value, 1) == 0))
1790	max = FFMAX(max, us);
1791	}
1792
1793	av_log(s, AV_LOG_DEBUG, "get_metadata_duration returned: %" PRId64 "\n", max);
1794	return max;
1795	}
1796
1797	static int mkv_write_header(AVFormatContext *s)
1798	{
1799	MatroskaMuxContext *mkv = s->priv_data;
1800	AVIOContext *pb = s->pb;
1801	ebml_master ebml_header;
1802	AVDictionaryEntry *tag;
1803	int ret, i, version = 2;
1804	int64_t creation_time;
1805
1806	if (!strcmp(s->oformat->name, "webm"))
1807	mkv->mode = MODE_WEBM;
1808	else
1809	mkv->mode = MODE_MATROSKAv2;
1810
1811	if (mkv->mode != MODE_WEBM ||
1812	av_dict_get(s->metadata, "stereo_mode", NULL, 0) ||
1813	av_dict_get(s->metadata, "alpha_mode", NULL, 0))
1814	version = 4;
1815
1816	for (i = 0; i < s->nb_streams; i++) {
1817	if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_ATRAC3 ||
1818	s->streams[i]->codecpar->codec_id == AV_CODEC_ID_COOK ||
1819	s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
1820	s->streams[i]->codecpar->codec_id == AV_CODEC_ID_SIPR ||
1821	s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV10 ||
1822	s->streams[i]->codecpar->codec_id == AV_CODEC_ID_RV20) {
1823	av_log(s, AV_LOG_ERROR,
1824	"The Matroska muxer does not yet support muxing %s\n",
1825	avcodec_get_name(s->streams[i]->codecpar->codec_id));
1826	return AVERROR_PATCHWELCOME;
1827	}
1828	if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS ||
1829	av_dict_get(s->streams[i]->metadata, "stereo_mode", NULL, 0) ||
1830	av_dict_get(s->streams[i]->metadata, "alpha_mode", NULL, 0))
1831	version = 4;
1832	}
1833
1834	mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
1835	if (!mkv->tracks) {
1836	ret = AVERROR(ENOMEM);
1837	goto fail;
1838	}
1839	ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
1840	put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
1841	put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
1842	put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
1843	put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
1844	put_ebml_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
1845	put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , version);
1846	put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
1847	end_ebml_master(pb, ebml_header);
1848
1849	mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
1850	mkv->segment_offset = avio_tell(pb);
1851
1852	// we write 2 seek heads - one at the end of the file to point to each
1853	// cluster, and one at the beginning to point to all other level one
1854	// elements (including the seek head at the end of the file), which
1855	// isn't more than 10 elements if we only write one of each other
1856	// currently defined level 1 element
1857	mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
1858	if (!mkv->main_seekhead) {
1859	ret = AVERROR(ENOMEM);
1860	goto fail;
1861	}
1862
1863	ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
1864	if (ret < 0) goto fail;
1865
1866	ret = start_ebml_master_crc32(pb, &mkv->info_bc, mkv, &mkv->info, MATROSKA_ID_INFO, 0);
1867	if (ret < 0)
1868	return ret;
1869	pb = mkv->info_bc;
1870
1871	put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
1872	if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
1873	put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
1874	if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
1875	put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
1876	if ((tag = av_dict_get(s->metadata, "encoding_tool", NULL, 0)))
1877	put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, tag->value);
1878	else
1879	put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
1880
1881	if (mkv->mode != MODE_WEBM) {
1882	uint32_t segment_uid[4];
1883	AVLFG lfg;
1884
1885	av_lfg_init(&lfg, av_get_random_seed());
1886
1887	for (i = 0; i < 4; i++)
1888	segment_uid[i] = av_lfg_get(&lfg);
1889
1890	put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
1891	}
1892	} else {
1893	const char *ident = "Lavf";
1894	put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);
1895	put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);
1896	}
1897
1898	if (ff_parse_creation_time_metadata(s, &creation_time, 0) > 0) {
1899	// Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.
1900	int64_t date_utc = (creation_time - 978307200000000LL) * 1000;
1901	uint8_t date_utc_buf[8];
1902	AV_WB64(date_utc_buf, date_utc);
1903	put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);
1904	}
1905
1906	// reserve space for the duration
1907	mkv->duration = 0;
1908	mkv->duration_offset = avio_tell(pb);
1909	if (!mkv->is_live) {
1910	int64_t metadata_duration = get_metadata_duration(s);
1911
1912	if (s->duration > 0) {
1913	int64_t scaledDuration = av_rescale(s->duration, 1000, AV_TIME_BASE);
1914	put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1915	av_log(s, AV_LOG_DEBUG, "Write early duration from recording time = %" PRIu64 "\n", scaledDuration);
1916	} else if (metadata_duration > 0) {
1917	int64_t scaledDuration = av_rescale(metadata_duration, 1000, AV_TIME_BASE);
1918	put_ebml_float(pb, MATROSKA_ID_DURATION, scaledDuration);
1919	av_log(s, AV_LOG_DEBUG, "Write early duration from metadata = %" PRIu64 "\n", scaledDuration);
1920	} else {
1921	put_ebml_void(pb, 11); // assumes double-precision float to be written
1922	}
1923	}
1924	if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1925	end_ebml_master_crc32_preliminary(s->pb, &mkv->info_bc, mkv, mkv->info);
1926	else
1927	end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
1928	pb = s->pb;
1929
1930	// initialize stream_duration fields
1931	mkv->stream_durations = av_mallocz(s->nb_streams * sizeof(int64_t));
1932	mkv->stream_duration_offsets = av_mallocz(s->nb_streams * sizeof(int64_t));
1933
1934	ret = mkv_write_tracks(s);
1935	if (ret < 0)
1936	goto fail;
1937
1938	for (i = 0; i < s->nb_chapters; i++)
1939	mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);
1940
1941	if (mkv->mode != MODE_WEBM) {
1942	ret = mkv_write_chapters(s);
1943	if (ret < 0)
1944	goto fail;
1945
1946	ret = mkv_write_attachments(s);
1947	if (ret < 0)
1948	goto fail;
1949
1950	ret = mkv_write_tags(s);
1951	if (ret < 0)
1952	goto fail;
1953	}
1954
1955	if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
1956	mkv_write_seekhead(pb, mkv);
1957
1958	mkv->cues = mkv_start_cues(mkv->segment_offset);
1959	if (!mkv->cues) {
1960	ret = AVERROR(ENOMEM);
1961	goto fail;
1962	}
1963	if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && mkv->reserve_cues_space) {
1964	mkv->cues_pos = avio_tell(pb);
1965	put_ebml_void(pb, mkv->reserve_cues_space);
1966	}
1967
1968	av_init_packet(&mkv->cur_audio_pkt);
1969	mkv->cur_audio_pkt.size = 0;
1970	mkv->cluster_pos = -1;
1971
1972	avio_flush(pb);
1973
1974	// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
1975	// after 4k and on a keyframe
1976	if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
1977	if (mkv->cluster_time_limit < 0)
1978	mkv->cluster_time_limit = 5000;
1979	if (mkv->cluster_size_limit < 0)
1980	mkv->cluster_size_limit = 5 * 1024 * 1024;
1981	} else {
1982	if (mkv->cluster_time_limit < 0)
1983	mkv->cluster_time_limit = 1000;
1984	if (mkv->cluster_size_limit < 0)
1985	mkv->cluster_size_limit = 32 * 1024;
1986	}
1987
1988	return 0;
1989	fail:
1990	mkv_free(mkv);
1991	return ret;
1992	}
1993
1994	static int mkv_blockgroup_size(int pkt_size)
1995	{
1996	int size = pkt_size + 4;
1997	size += ebml_num_size(size);
1998	size += 2; // EBML ID for block and block duration
1999	size += 8; // max size of block duration
2000	size += ebml_num_size(size);
2001	size += 1; // blockgroup EBML ID
2002	return size;
2003	}
2004
2005	static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)
2006	{
2007	uint8_t *dst;
2008	int srclen = *size;
2009	int offset = 0;
2010	int ret;
2011
2012	dst = av_malloc(srclen);
2013	if (!dst)
2014	return AVERROR(ENOMEM);
2015
2016	while (srclen >= WV_HEADER_SIZE) {
2017	WvHeader header;
2018
2019	ret = ff_wv_parse_header(&header, src);
2020	if (ret < 0)
2021	goto fail;
2022	src += WV_HEADER_SIZE;
2023	srclen -= WV_HEADER_SIZE;
2024
2025	if (srclen < header.blocksize) {
2026	ret = AVERROR_INVALIDDATA;
2027	goto fail;
2028	}
2029
2030	if (header.initial) {
2031	AV_WL32(dst + offset, header.samples);
2032	offset += 4;
2033	}
2034	AV_WL32(dst + offset, header.flags);
2035	AV_WL32(dst + offset + 4, header.crc);
2036	offset += 8;
2037
2038	if (!(header.initial && header.final)) {
2039	AV_WL32(dst + offset, header.blocksize);
2040	offset += 4;
2041	}
2042
2043	memcpy(dst + offset, src, header.blocksize);
2044	src += header.blocksize;
2045	srclen -= header.blocksize;
2046	offset += header.blocksize;
2047	}
2048
2049	*pdst = dst;
2050	*size = offset;
2051
2052	return 0;
2053	fail:
2054	av_freep(&dst);
2055	return ret;
2056	}
2057
2058	static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
2059	unsigned int blockid, AVPacket *pkt, int keyframe)
2060	{
2061	MatroskaMuxContext *mkv = s->priv_data;
2062	AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2063	uint8_t *data = NULL, *side_data = NULL;
2064	int offset = 0, size = pkt->size, side_data_size = 0;
2065	int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2066	uint64_t additional_id = 0;
2067	int64_t discard_padding = 0;
2068	uint8_t track_number = (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1));
2069	ebml_master block_group, block_additions, block_more;
2070
2071	av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2072	"pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", keyframe %d\n",
2073	avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration,
2074	keyframe != 0);
2075	if (par->codec_id == AV_CODEC_ID_H264 && par->extradata_size > 0 &&
2076	(AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
2077	ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
2078	else if (par->codec_id == AV_CODEC_ID_HEVC && par->extradata_size > 6 &&
2079	(AV_RB24(par->extradata) == 1 || AV_RB32(par->extradata) == 1))
2080	/* extradata is Annex B, assume the bitstream is too and convert it */
2081	ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL);
2082	else if (par->codec_id == AV_CODEC_ID_WAVPACK) {
2083	int ret = mkv_strip_wavpack(pkt->data, &data, &size);
2084	if (ret < 0) {
2085	av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");
2086	return;
2087	}
2088	} else
2089	data = pkt->data;
2090
2091	if (par->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
2092	/* Matroska specification requires to remove the first QuickTime atom
2093	*/
2094	size -= 8;
2095	offset = 8;
2096	}
2097
2098	side_data = av_packet_get_side_data(pkt,
2099	AV_PKT_DATA_SKIP_SAMPLES,
2100	&side_data_size);
2101
2102	if (side_data && side_data_size >= 10) {
2103	discard_padding = av_rescale_q(AV_RL32(side_data + 4),
2104	(AVRational){1, par->sample_rate},
2105	(AVRational){1, 1000000000});
2106	}
2107
2108	side_data = av_packet_get_side_data(pkt,
2109	AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2110	&side_data_size);
2111	if (side_data) {
2112	additional_id = AV_RB64(side_data);
2113	side_data += 8;
2114	side_data_size -= 8;
2115	}
2116
2117	if ((side_data_size && additional_id == 1) || discard_padding) {
2118	block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
2119	blockid = MATROSKA_ID_BLOCK;
2120	}
2121
2122	put_ebml_id(pb, blockid);
2123	put_ebml_num(pb, size + 4, 0);
2124	// this assumes stream_index is less than 126
2125	avio_w8(pb, 0x80 | track_number);
2126	avio_wb16(pb, ts - mkv->cluster_pts);
2127	avio_w8(pb, (blockid == MATROSKA_ID_SIMPLEBLOCK && keyframe) ? (1 << 7) : 0);
2128	avio_write(pb, data + offset, size);
2129	if (data != pkt->data)
2130	av_free(data);
2131
2132	if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
2133	put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE,
2134	mkv->last_track_timestamp[track_number - 1]);
2135	}
2136	mkv->last_track_timestamp[track_number - 1] = ts - mkv->cluster_pts;
2137
2138	if (discard_padding) {
2139	put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);
2140	}
2141
2142	if (side_data_size && additional_id == 1) {
2143	block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);
2144	block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);
2145	put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);
2146	put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);
2147	put_ebml_num(pb, side_data_size, 0);
2148	avio_write(pb, side_data, side_data_size);
2149	end_ebml_master(pb, block_more);
2150	end_ebml_master(pb, block_additions);
2151	}
2152	if ((side_data_size && additional_id == 1) || discard_padding) {
2153	end_ebml_master(pb, block_group);
2154	}
2155	}
2156
2157	static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
2158	{
2159	MatroskaMuxContext *mkv = s->priv_data;
2160	ebml_master blockgroup;
2161	int id_size, settings_size, size;
2162	uint8_t *id, *settings;
2163	int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2164	const int flags = 0;
2165
2166	id_size = 0;
2167	id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
2168	&id_size);
2169
2170	settings_size = 0;
2171	settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
2172	&settings_size);
2173
2174	size = id_size + 1 + settings_size + 1 + pkt->size;
2175
2176	av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
2177	"pts %" PRId64 ", dts %" PRId64 ", duration %" PRId64 ", flags %d\n",
2178	avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);
2179
2180	blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
2181
2182	put_ebml_id(pb, MATROSKA_ID_BLOCK);
2183	put_ebml_num(pb, size + 4, 0);
2184	avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
2185	avio_wb16(pb, ts - mkv->cluster_pts);
2186	avio_w8(pb, flags);
2187	avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);
2188
2189	put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);
2190	end_ebml_master(pb, blockgroup);
2191
2192	return pkt->duration;
2193	}
2194
2195	static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
2196	{
2197	MatroskaMuxContext *mkv = s->priv_data;
2198
2199	end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2200	mkv->cluster_pos = -1;
2201	if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
2202	av_log(s, AV_LOG_DEBUG,
2203	"Starting new cluster at offset %" PRIu64 " bytes, "
2204	"pts %" PRIu64 "dts %" PRIu64 "\n",
2205	avio_tell(s->pb), pkt->pts, pkt->dts);
2206	else
2207	av_log(s, AV_LOG_DEBUG, "Starting new cluster, "
2208	"pts %" PRIu64 "dts %" PRIu64 "\n",
2209	pkt->pts, pkt->dts);
2210	avio_flush(s->pb);
2211	}
2212
2213	static int mkv_check_new_extra_data(AVFormatContext *s, AVPacket *pkt)
2214	{
2215	MatroskaMuxContext *mkv = s->priv_data;
2216	mkv_track *track = &mkv->tracks[pkt->stream_index];
2217	AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2218	uint8_t *side_data;
2219	int side_data_size = 0, ret;
2220
2221	side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
2222	&side_data_size);
2223
2224	switch (par->codec_id) {
2225	case AV_CODEC_ID_FLAC:
2226	if (side_data_size && (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2227	AVCodecParameters *codecpriv_par;
2228	int64_t curpos;
2229	if (side_data_size != par->extradata_size) {
2230	av_log(s, AV_LOG_ERROR, "Invalid FLAC STREAMINFO metadata for output stream %d\n",
2231	pkt->stream_index);
2232	return AVERROR(EINVAL);
2233	}
2234	codecpriv_par = avcodec_parameters_alloc();
2235	if (!codecpriv_par)
2236	return AVERROR(ENOMEM);
2237	ret = avcodec_parameters_copy(codecpriv_par, par);
2238	if (ret < 0) {
2239	avcodec_parameters_free(&codecpriv_par);
2240	return ret;
2241	}
2242	memcpy(codecpriv_par->extradata, side_data, side_data_size);
2243	curpos = avio_tell(mkv->tracks_bc);
2244	avio_seek(mkv->tracks_bc, track->codecpriv_offset, SEEK_SET);
2245	mkv_write_codecprivate(s, mkv->tracks_bc, codecpriv_par, 1, 0);
2246	avio_seek(mkv->tracks_bc, curpos, SEEK_SET);
2247	avcodec_parameters_free(&codecpriv_par);
2248	}
2249	break;
2250	default:
2251	if (side_data_size)
2252	av_log(s, AV_LOG_DEBUG, "Ignoring new extradata in a packet for stream %d.\n", pkt->stream_index);
2253	break;
2254	}
2255
2256	return 0;
2257	}
2258
2259	static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_cue)
2260	{
2261	MatroskaMuxContext *mkv = s->priv_data;
2262	AVIOContext *pb = s->pb;
2263	AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
2264	int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2265	int duration = pkt->duration;
2266	int ret;
2267	int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
2268	int64_t relative_packet_pos;
2269	int dash_tracknum = mkv->is_dash ? mkv->dash_track_number : pkt->stream_index + 1;
2270
2271	if (ts == AV_NOPTS_VALUE) {
2272	av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
2273	return AVERROR(EINVAL);
2274	}
2275	ts += mkv->tracks[pkt->stream_index].ts_offset;
2276
2277	if (mkv->cluster_pos != -1) {
2278	int64_t cluster_time = ts - mkv->cluster_pts + mkv->tracks[pkt->stream_index].ts_offset;
2279	if ((int16_t)cluster_time != cluster_time) {
2280	av_log(s, AV_LOG_WARNING, "Starting new cluster due to timestamp\n");
2281	mkv_start_new_cluster(s, pkt);
2282	}
2283	}
2284
2285	if (mkv->cluster_pos == -1) {
2286	mkv->cluster_pos = avio_tell(s->pb);
2287	ret = start_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, &mkv->cluster, MATROSKA_ID_CLUSTER, 0);
2288	if (ret < 0)
2289	return ret;
2290	put_ebml_uint(mkv->dyn_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
2291	mkv->cluster_pts = FFMAX(0, ts);
2292	}
2293	pb = mkv->dyn_bc;
2294
2295	relative_packet_pos = avio_tell(pb);
2296
2297	if (par->codec_type != AVMEDIA_TYPE_SUBTITLE) {
2298	mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe);
2299	if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && (par->codec_type == AVMEDIA_TYPE_VIDEO && keyframe || add_cue)) {
2300	ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts, mkv->cluster_pos, relative_packet_pos, -1);
2301	if (ret < 0) return ret;
2302	}
2303	} else {
2304	if (par->codec_id == AV_CODEC_ID_WEBVTT) {
2305	duration = mkv_write_vtt_blocks(s, pb, pkt);
2306	} else {
2307	ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
2308	mkv_blockgroup_size(pkt->size));
2309
2310	#if FF_API_CONVERGENCE_DURATION
2311	FF_DISABLE_DEPRECATION_WARNINGS
2312	/* For backward compatibility, prefer convergence_duration. */
2313	if (pkt->convergence_duration > 0) {
2314	duration = pkt->convergence_duration;
2315	}
2316	FF_ENABLE_DEPRECATION_WARNINGS
2317	#endif
2318	/* All subtitle blocks are considered to be keyframes. */
2319	mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 1);
2320	put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
2321	end_ebml_master(pb, blockgroup);
2322	}
2323
2324	if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
2325	ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, dash_tracknum, ts,
2326	mkv->cluster_pos, relative_packet_pos, duration);
2327	if (ret < 0)
2328	return ret;
2329	}
2330	}
2331
2332	mkv->duration = FFMAX(mkv->duration, ts + duration);
2333
2334	if (mkv->stream_durations)
2335	mkv->stream_durations[pkt->stream_index] =
2336	FFMAX(mkv->stream_durations[pkt->stream_index], ts + duration);
2337
2338	return 0;
2339	}
2340
2341	static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
2342	{
2343	MatroskaMuxContext *mkv = s->priv_data;
2344	int codec_type = s->streams[pkt->stream_index]->codecpar->codec_type;
2345	int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
2346	int cluster_size;
2347	int64_t cluster_time;
2348	int ret;
2349	int start_new_cluster;
2350
2351	ret = mkv_check_new_extra_data(s, pkt);
2352	if (ret < 0)
2353	return ret;
2354
2355	if (mkv->tracks[pkt->stream_index].write_dts)
2356	cluster_time = pkt->dts - mkv->cluster_pts;
2357	else
2358	cluster_time = pkt->pts - mkv->cluster_pts;
2359	cluster_time += mkv->tracks[pkt->stream_index].ts_offset;
2360
2361	// start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
2362	// after 4k and on a keyframe
2363	cluster_size = avio_tell(mkv->dyn_bc);
2364
2365	if (mkv->is_dash && codec_type == AVMEDIA_TYPE_VIDEO) {
2366	// WebM DASH specification states that the first block of every cluster
2367	// has to be a key frame. So for DASH video, we only create a cluster
2368	// on seeing key frames.
2369	start_new_cluster = keyframe;
2370	} else if (mkv->is_dash && codec_type == AVMEDIA_TYPE_AUDIO &&
2371	(mkv->cluster_pos == -1 ||
2372	cluster_time > mkv->cluster_time_limit)) {
2373	// For DASH audio, we create a Cluster based on cluster_time_limit
2374	start_new_cluster = 1;
2375	} else if (!mkv->is_dash &&
2376	(cluster_size > mkv->cluster_size_limit ||
2377	cluster_time > mkv->cluster_time_limit ||
2378	(codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&
2379	cluster_size > 4 * 1024))) {
2380	start_new_cluster = 1;
2381	} else {
2382	start_new_cluster = 0;
2383	}
2384
2385	if (mkv->cluster_pos != -1 && start_new_cluster) {
2386	mkv_start_new_cluster(s, pkt);
2387	}
2388
2389	if (!mkv->cluster_pos)
2390	avio_write_marker(s->pb,
2391	av_rescale_q(pkt->dts, s->streams[pkt->stream_index]->time_base, AV_TIME_BASE_Q),
2392	keyframe && (mkv->have_video ? codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
2393
2394	// check if we have an audio packet cached
2395	if (mkv->cur_audio_pkt.size > 0) {
2396	// for DASH audio, a CuePoint has to be added when there is a new cluster.
2397	ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt,
2398	mkv->is_dash ? start_new_cluster : 0);
2399	av_packet_unref(&mkv->cur_audio_pkt);
2400	if (ret < 0) {
2401	av_log(s, AV_LOG_ERROR,
2402	"Could not write cached audio packet ret:%d\n", ret);
2403	return ret;
2404	}
2405	}
2406
2407	// buffer an audio packet to ensure the packet containing the video
2408	// keyframe's timecode is contained in the same cluster for WebM
2409	if (codec_type == AVMEDIA_TYPE_AUDIO) {
2410	ret = av_packet_ref(&mkv->cur_audio_pkt, pkt);
2411	} else
2412	ret = mkv_write_packet_internal(s, pkt, 0);
2413	return ret;
2414	}
2415
2416	static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)
2417	{
2418	MatroskaMuxContext *mkv = s->priv_data;
2419
2420	if (!pkt) {
2421	if (mkv->cluster_pos != -1) {
2422	end_ebml_master_crc32(s->pb, &mkv->dyn_bc, mkv, mkv->cluster);
2423	mkv->cluster_pos = -1;
2424	if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
2425	av_log(s, AV_LOG_DEBUG,
2426	"Flushing cluster at offset %" PRIu64 " bytes\n",
2427	avio_tell(s->pb));
2428	else
2429	av_log(s, AV_LOG_DEBUG, "Flushing cluster\n");
2430	avio_flush(s->pb);
2431	}
2432	return 1;
2433	}
2434	return mkv_write_packet(s, pkt);
2435	}
2436
2437	static int mkv_write_trailer(AVFormatContext *s)
2438	{
2439	MatroskaMuxContext *mkv = s->priv_data;
2440	AVIOContext *pb = s->pb;
2441	int64_t currentpos, cuespos;
2442	int ret;
2443
2444	// check if we have an audio packet cached
2445	if (mkv->cur_audio_pkt.size > 0) {
2446	ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt, 0);
2447	av_packet_unref(&mkv->cur_audio_pkt);
2448	if (ret < 0) {
2449	av_log(s, AV_LOG_ERROR,
2450	"Could not write cached audio packet ret:%d\n", ret);
2451	return ret;
2452	}
2453	}
2454
2455	if (mkv->dyn_bc) {
2456	end_ebml_master_crc32(pb, &mkv->dyn_bc, mkv, mkv->cluster);
2457	}
2458
2459	if (mkv->mode != MODE_WEBM) {
2460	ret = mkv_write_chapters(s);
2461	if (ret < 0)
2462	return ret;
2463	}
2464
2465	if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live) {
2466	if (mkv->cues->num_entries) {
2467	if (mkv->reserve_cues_space) {
2468	int64_t cues_end;
2469
2470	currentpos = avio_tell(pb);
2471	avio_seek(pb, mkv->cues_pos, SEEK_SET);
2472
2473	cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2474	cues_end = avio_tell(pb);
2475	if (cues_end > cuespos + mkv->reserve_cues_space) {
2476	av_log(s, AV_LOG_ERROR,
2477	"Insufficient space reserved for cues: %d "
2478	"(needed: %" PRId64 ").\n",
2479	mkv->reserve_cues_space, cues_end - cuespos);
2480	return AVERROR(EINVAL);
2481	}
2482
2483	if (cues_end < cuespos + mkv->reserve_cues_space)
2484	put_ebml_void(pb, mkv->reserve_cues_space -
2485	(cues_end - cuespos));
2486
2487	avio_seek(pb, currentpos, SEEK_SET);
2488	} else {
2489	cuespos = mkv_write_cues(s, mkv->cues, mkv->tracks, s->nb_streams);
2490	}
2491
2492	ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES,
2493	cuespos);
2494	if (ret < 0)
2495	return ret;
2496	}
2497
2498	mkv_write_seekhead(pb, mkv);
2499
2500	// update the duration
2501	av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
2502	currentpos = avio_tell(pb);
2503	avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
2504	put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
2505	avio_seek(pb, mkv->info.pos, SEEK_SET);
2506	end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
2507
2508	// write tracks master
2509	avio_seek(pb, mkv->tracks_master.pos, SEEK_SET);
2510	end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
2511
2512	// update stream durations
2513	if (!mkv->is_live && mkv->stream_durations) {
2514	int i;
2515	int64_t curr = avio_tell(mkv->tags_bc);
2516	for (i = 0; i < s->nb_streams; ++i) {
2517	AVStream *st = s->streams[i];
2518
2519	if (mkv->stream_duration_offsets[i] > 0) {
2520	double duration_sec = mkv->stream_durations[i] * av_q2d(st->time_base);
2521	char duration_string[20] = "";
2522
2523	av_log(s, AV_LOG_DEBUG, "stream %d end duration = %" PRIu64 "\n", i,
2524	mkv->stream_durations[i]);
2525
2526	avio_seek(mkv->tags_bc, mkv->stream_duration_offsets[i], SEEK_SET);
2527
2528	snprintf(duration_string, 20, "%02d:%02d:%012.9f",
2529	(int) duration_sec / 3600, ((int) duration_sec / 60) % 60,
2530	fmod(duration_sec, 60));
2531
2532	put_ebml_binary(mkv->tags_bc, MATROSKA_ID_TAGSTRING, duration_string, 20);
2533	}
2534	}
2535	avio_seek(mkv->tags_bc, curr, SEEK_SET);
2536	}
2537	if (mkv->tags.pos && !mkv->is_live) {
2538	avio_seek(pb, mkv->tags.pos, SEEK_SET);
2539	end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
2540	}
2541
2542	avio_seek(pb, currentpos, SEEK_SET);
2543	}
2544
2545	if (!mkv->is_live) {
2546	end_ebml_master(pb, mkv->segment);
2547	}
2548
2549	mkv_free(mkv);
2550	return 0;
2551	}
2552
2553	static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)
2554	{
2555	int i;
2556	for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)
2557	if (ff_mkv_codec_tags[i].id == codec_id)
2558	return 1;
2559
2560	if (std_compliance < FF_COMPLIANCE_NORMAL) {
2561	enum AVMediaType type = avcodec_get_type(codec_id);
2562	// mkv theoretically supports any video/audio through VFW/ACM
2563	if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)
2564	return 1;
2565	}
2566
2567	return 0;
2568	}
2569
2570	static int mkv_init(struct AVFormatContext *s)
2571	{
2572	int i;
2573
2574	if (s->avoid_negative_ts < 0) {
2575	s->avoid_negative_ts = 1;
2576	s->internal->avoid_negative_ts_use_pts = 1;
2577	}
2578
2579	for (i = 0; i < s->nb_streams; i++) {
2580	// ms precision is the de-facto standard timescale for mkv files
2581	avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
2582	}
2583
2584	return 0;
2585	}
2586
2587	static int mkv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
2588	{
2589	int ret = 1;
2590	AVStream *st = s->streams[pkt->stream_index];
2591
2592	if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
2593	if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
2594	ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
2595	} else if (st->codecpar->codec_id == AV_CODEC_ID_VP9) {
2596	ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);
2597	}
2598
2599	return ret;
2600	}
2601
2602	static const AVCodecTag additional_audio_tags[] = {
2603	{ AV_CODEC_ID_ALAC, 0XFFFFFFFF },
2604	{ AV_CODEC_ID_EAC3, 0XFFFFFFFF },
2605	{ AV_CODEC_ID_MLP, 0xFFFFFFFF },
2606	{ AV_CODEC_ID_OPUS, 0xFFFFFFFF },
2607	{ AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
2608	{ AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
2609	{ AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
2610	{ AV_CODEC_ID_QDMC, 0xFFFFFFFF },
2611	{ AV_CODEC_ID_QDM2, 0xFFFFFFFF },
2612	{ AV_CODEC_ID_RA_144, 0xFFFFFFFF },
2613	{ AV_CODEC_ID_RA_288, 0xFFFFFFFF },
2614	{ AV_CODEC_ID_COOK, 0xFFFFFFFF },
2615	{ AV_CODEC_ID_TRUEHD, 0xFFFFFFFF },
2616	{ AV_CODEC_ID_NONE, 0xFFFFFFFF }
2617	};
2618
2619	static const AVCodecTag additional_video_tags[] = {
2620	{ AV_CODEC_ID_RV10, 0xFFFFFFFF },
2621	{ AV_CODEC_ID_RV20, 0xFFFFFFFF },
2622	{ AV_CODEC_ID_RV30, 0xFFFFFFFF },
2623	{ AV_CODEC_ID_RV40, 0xFFFFFFFF },
2624	{ AV_CODEC_ID_VP9, 0xFFFFFFFF },
2625	{ AV_CODEC_ID_NONE, 0xFFFFFFFF }
2626	};
2627
2628	static const AVCodecTag additional_subtitle_tags[] = {
2629	{ AV_CODEC_ID_DVB_SUBTITLE, 0xFFFFFFFF },
2630	{ AV_CODEC_ID_HDMV_PGS_SUBTITLE, 0xFFFFFFFF },
2631	{ AV_CODEC_ID_NONE, 0xFFFFFFFF }
2632	};
2633
2634	#define OFFSET(x) offsetof(MatroskaMuxContext, x)
2635	#define FLAGS AV_OPT_FLAG_ENCODING_PARAM
2636	static const AVOption options[] = {
2637	{ "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 },
2638	{ "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 },
2639	{ "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 },
2640	{ "dash", "Create a WebM file conforming to WebM DASH specification", OFFSET(is_dash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2641	{ "dash_track_number", "Track number for the DASH stream", OFFSET(dash_track_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 127, FLAGS },
2642	{ "live", "Write files assuming it is a live stream.", OFFSET(is_live), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2643	{ "allow_raw_vfw", "allow RAW VFW mode", OFFSET(allow_raw_vfw), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
2644	{ "write_crc32", "write a CRC32 element inside every Level 1 element", OFFSET(write_crc), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
2645	{ NULL },
2646	};
2647
2648	#if CONFIG_MATROSKA_MUXER
2649	static const AVClass matroska_class = {
2650	.class_name = "matroska muxer",
2651	.item_name = av_default_item_name,
2652	.option = options,
2653	.version = LIBAVUTIL_VERSION_INT,
2654	};
2655
2656	AVOutputFormat ff_matroska_muxer = {
2657	.name = "matroska",
2658	.long_name = NULL_IF_CONFIG_SMALL("Matroska"),
2659	.mime_type = "video/x-matroska",
2660	.extensions = "mkv",
2661	.priv_data_size = sizeof(MatroskaMuxContext),
2662	.audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2663	AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2664	.video_codec = CONFIG_LIBX264_ENCODER ?
2665	AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,
2666	.init = mkv_init,
2667	.write_header = mkv_write_header,
2668	.write_packet = mkv_write_flush_packet,
2669	.write_trailer = mkv_write_trailer,
2670	.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2671	AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2672	.codec_tag = (const AVCodecTag* const []){
2673	ff_codec_bmp_tags, ff_codec_wav_tags,
2674	additional_audio_tags, additional_video_tags, additional_subtitle_tags, 0
2675	},
2676	.subtitle_codec = AV_CODEC_ID_ASS,
2677	.query_codec = mkv_query_codec,
2678	.check_bitstream = mkv_check_bitstream,
2679	.priv_class = &matroska_class,
2680	};
2681	#endif
2682
2683	#if CONFIG_WEBM_MUXER
2684	static const AVClass webm_class = {
2685	.class_name = "webm muxer",
2686	.item_name = av_default_item_name,
2687	.option = options,
2688	.version = LIBAVUTIL_VERSION_INT,
2689	};
2690
2691	AVOutputFormat ff_webm_muxer = {
2692	.name = "webm",
2693	.long_name = NULL_IF_CONFIG_SMALL("WebM"),
2694	.mime_type = "video/webm",
2695	.extensions = "webm",
2696	.priv_data_size = sizeof(MatroskaMuxContext),
2697	.audio_codec = CONFIG_LIBOPUS_ENCODER ? AV_CODEC_ID_OPUS : AV_CODEC_ID_VORBIS,
2698	.video_codec = CONFIG_LIBVPX_VP9_ENCODER? AV_CODEC_ID_VP9 : AV_CODEC_ID_VP8,
2699	.subtitle_codec = AV_CODEC_ID_WEBVTT,
2700	.init = mkv_init,
2701	.write_header = mkv_write_header,
2702	.write_packet = mkv_write_flush_packet,
2703	.write_trailer = mkv_write_trailer,
2704	.check_bitstream = mkv_check_bitstream,
2705	.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
2706	AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
2707	.priv_class = &webm_class,
2708	};
2709	#endif
2710
2711	#if CONFIG_MATROSKA_AUDIO_MUXER
2712	static const AVClass mka_class = {
2713	.class_name = "matroska audio muxer",
2714	.item_name = av_default_item_name,
2715	.option = options,
2716	.version = LIBAVUTIL_VERSION_INT,
2717	};
2718	AVOutputFormat ff_matroska_audio_muxer = {
2719	.name = "matroska",
2720	.long_name = NULL_IF_CONFIG_SMALL("Matroska Audio"),
2721	.mime_type = "audio/x-matroska",
2722	.extensions = "mka",
2723	.priv_data_size = sizeof(MatroskaMuxContext),
2724	.audio_codec = CONFIG_LIBVORBIS_ENCODER ?
2725	AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,
2726	.video_codec = AV_CODEC_ID_NONE,
2727	.init = mkv_init,
2728	.write_header = mkv_write_header,
2729	.write_packet = mkv_write_flush_packet,
2730	.write_trailer = mkv_write_trailer,
2731	.check_bitstream = mkv_check_bitstream,
2732	.flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |
2733	AVFMT_ALLOW_FLUSH,
2734	.codec_tag = (const AVCodecTag* const []){
2735	ff_codec_wav_tags, additional_audio_tags, 0
2736	},
2737	.priv_class = &mka_class,
2738	};
2739	#endif
2740