mkvenc: Write TrackTimecodeScale
[libav.git] / libavformat / matroskaenc.c
CommitLineData
67143c0f 1/*
8cf3bb26 2 * Matroska muxer
67143c0f
DC
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 "avformat.h"
23#include "riff.h"
f009e36f 24#include "isom.h"
67143c0f 25#include "matroska.h"
aacc5f22 26#include "avc.h"
2578326f 27#include "flacenc.h"
6a5d31ac 28#include "libavutil/intreadwrite.h"
245976da
DB
29#include "libavutil/md5.h"
30#include "libavcodec/xiph.h"
7bfacd4e 31#include "libavcodec/mpeg4audio.h"
67143c0f 32
baf71dca 33typedef struct ebml_master {
bc5c918e 34 int64_t pos; ///< absolute offset in the file where the master's elements start
baf71dca
DC
35 int sizebytes; ///< how many bytes were reserved for the size
36} ebml_master;
37
967d815a
DC
38typedef struct mkv_seekhead_entry {
39 unsigned int elementid;
40 uint64_t segmentpos;
41} mkv_seekhead_entry;
42
43typedef struct mkv_seekhead {
bc5c918e
DB
44 int64_t filepos;
45 int64_t segment_offset; ///< the file offset to the beginning of the segment
1b66d314 46 int reserved_size; ///< -1 if appending to file
967d815a
DC
47 int max_entries;
48 mkv_seekhead_entry *entries;
49 int num_entries;
50} mkv_seekhead;
51
6364d534
DC
52typedef struct {
53 uint64_t pts;
54 int tracknum;
bc5c918e 55 int64_t cluster_pos; ///< file offset of the cluster containing the block
6364d534
DC
56} mkv_cuepoint;
57
58typedef struct {
bc5c918e 59 int64_t segment_offset;
6364d534
DC
60 mkv_cuepoint *entries;
61 int num_entries;
62} mkv_cues;
63
67143c0f 64typedef struct MatroskaMuxContext {
baf71dca 65 ebml_master segment;
bc5c918e
DB
66 int64_t segment_offset;
67 int64_t segment_uid;
baf71dca 68 ebml_master cluster;
bc5c918e 69 int64_t cluster_pos; ///< file offset of the current cluster
7973dd0b 70 uint64_t cluster_pts;
bc5c918e 71 int64_t duration_offset;
7973dd0b 72 uint64_t duration;
967d815a
DC
73 mkv_seekhead *main_seekhead;
74 mkv_seekhead *cluster_seekhead;
6364d534 75 mkv_cues *cues;
541d443c
DC
76
77 struct AVMD5 *md5_ctx;
67143c0f
DC
78} MatroskaMuxContext;
79
baf71dca 80
e3cd80cd
DC
81/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
82 * offset, 4 bytes for target EBML ID */
baf71dca
DC
83#define MAX_SEEKENTRY_SIZE 21
84
e3cd80cd
DC
85/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
86 * 8-byte uint max */
baf71dca
DC
87#define MAX_CUETRACKPOS_SIZE 22
88
e3cd80cd 89/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
baf71dca
DC
90#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
91
92
22ccb69a
DC
93static int ebml_id_size(unsigned int id)
94{
95 return (av_log2(id+1)-1)/7+1;
96}
97
67143c0f
DC
98static void put_ebml_id(ByteIOContext *pb, unsigned int id)
99{
432adc13
DC
100 int i = ebml_id_size(id);
101 while (i--)
102 put_byte(pb, id >> (i*8));
67143c0f
DC
103}
104
ec8f4ad9 105/**
bf898960 106 * Write an EBML size meaning "unknown size".
ec8f4ad9 107 *
bf898960 108 * @param bytes The number of bytes the size should occupy (maximum: 8).
ec8f4ad9
DC
109 */
110static void put_ebml_size_unknown(ByteIOContext *pb, int bytes)
111{
0580a122 112 assert(bytes <= 8);
203cce9a
DC
113 put_byte(pb, 0x1ff >> bytes);
114 while (--bytes)
115 put_byte(pb, 0xff);
ec8f4ad9
DC
116}
117
1c73478c 118/**
0f651e8c 119 * Calculate how many bytes are needed to represent a given number in EBML.
1c73478c 120 */
0f651e8c 121static int ebml_num_size(uint64_t num)
1c73478c
DC
122{
123 int bytes = 1;
0f651e8c 124 while ((num+1) >> bytes*7) bytes++;
1c73478c
DC
125 return bytes;
126}
127
f0e9f442 128/**
0f651e8c 129 * Write a number in EBML variable length format.
f0e9f442 130 *
0f651e8c 131 * @param bytes The number of bytes that need to be used to write the number.
f0e9f442
DC
132 * If zero, any number of bytes can be used.
133 */
0f651e8c 134static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes)
67143c0f 135{
0f651e8c 136 int i, needed_bytes = ebml_num_size(num);
67143c0f
DC
137
138 // sizes larger than this are currently undefined in EBML
0f651e8c 139 assert(num < (1ULL<<56)-1);
ffb880c2 140
f0e9f442
DC
141 if (bytes == 0)
142 // don't care how many bytes are used, so use the min
143 bytes = needed_bytes;
47e08c58
DC
144 // the bytes needed to write the given size would exceed the bytes
145 // that we need to use, so write unknown size. This shouldn't happen.
0580a122 146 assert(bytes >= needed_bytes);
f0e9f442 147
0f651e8c 148 num |= 1ULL << bytes*7;
ddf16467 149 for (i = bytes - 1; i >= 0; i--)
0f651e8c 150 put_byte(pb, num >> i*8);
67143c0f
DC
151}
152
153static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
154{
9f38fd7e 155 int i, bytes = 1;
73260a11
AJ
156 uint64_t tmp = val;
157 while (tmp>>=8) bytes++;
67143c0f
DC
158
159 put_ebml_id(pb, elementid);
0f651e8c 160 put_ebml_num(pb, bytes, 0);
9f38fd7e
DC
161 for (i = bytes - 1; i >= 0; i--)
162 put_byte(pb, val >> i*8);
67143c0f
DC
163}
164
9b6b0c79
DC
165static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
166{
9b6b0c79 167 put_ebml_id(pb, elementid);
0f651e8c 168 put_ebml_num(pb, 8, 0);
9b6b0c79
DC
169 put_be64(pb, av_dbl2int(val));
170}
171
67143c0f 172static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
1e18c4d0 173 const uint8_t *buf, int size)
67143c0f
DC
174{
175 put_ebml_id(pb, elementid);
0f651e8c 176 put_ebml_num(pb, size, 0);
67143c0f
DC
177 put_buffer(pb, buf, size);
178}
179
1e18c4d0 180static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str)
67143c0f
DC
181{
182 put_ebml_binary(pb, elementid, str, strlen(str));
183}
184
57848e9a 185/**
cfde5d18
DC
186 * Writes a void element of a given size. Useful for reserving space in
187 * the file to be written to later.
57848e9a 188 *
5045da83 189 * @param size The number of bytes to reserve, which must be at least 2.
57848e9a 190 */
f57b85a5
DC
191static void put_ebml_void(ByteIOContext *pb, uint64_t size)
192{
bc5c918e 193 int64_t currentpos = url_ftell(pb);
f57b85a5 194
0580a122 195 assert(size >= 2);
f57b85a5
DC
196
197 put_ebml_id(pb, EBML_ID_VOID);
cfde5d18
DC
198 // we need to subtract the length needed to store the size from the
199 // size we need to reserve so 2 cases, we use 8 bytes to store the
200 // size if possible, 1 byte otherwise
f57b85a5 201 if (size < 10)
0f651e8c 202 put_ebml_num(pb, size-1, 0);
f57b85a5 203 else
0f651e8c 204 put_ebml_num(pb, size-9, 8);
2024c226
MN
205 while(url_ftell(pb) < currentpos + size)
206 put_byte(pb, 0);
f57b85a5
DC
207}
208
baf71dca 209static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize)
67143c0f 210{
0f651e8c 211 int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
67143c0f 212 put_ebml_id(pb, elementid);
baf71dca
DC
213 put_ebml_size_unknown(pb, bytes);
214 return (ebml_master){ url_ftell(pb), bytes };
67143c0f
DC
215}
216
baf71dca 217static void end_ebml_master(ByteIOContext *pb, ebml_master master)
67143c0f 218{
bc5c918e 219 int64_t pos = url_ftell(pb);
67143c0f 220
ac9e1177
DC
221 // leave the unknown size for masters when streaming
222 if (url_is_streamed(pb))
223 return;
224
baf71dca 225 url_fseek(pb, master.pos - master.sizebytes, SEEK_SET);
0f651e8c 226 put_ebml_num(pb, pos - master.pos, master.sizebytes);
67143c0f
DC
227 url_fseek(pb, pos, SEEK_SET);
228}
229
86be6637
DC
230static void put_xiph_size(ByteIOContext *pb, int size)
231{
232 int i;
233 for (i = 0; i < size / 255; i++)
234 put_byte(pb, 255);
235 put_byte(pb, size % 255);
236}
237
57848e9a 238/**
cfde5d18
DC
239 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
240 * elements. If a maximum number of elements is specified, enough space
241 * will be reserved at the current file location to write a seek head of
242 * that size.
57848e9a 243 *
cfde5d18 244 * @param segment_offset The absolute offset to the position in the file
ab332d01
DC
245 * where the segment begins.
246 * @param numelements The maximum number of elements that will be indexed
cfde5d18 247 * by this seek head, 0 if unlimited.
57848e9a 248 */
bc5c918e 249static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, int64_t segment_offset, int numelements)
967d815a
DC
250{
251 mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
252 if (new_seekhead == NULL)
253 return NULL;
254
255 new_seekhead->segment_offset = segment_offset;
256
257 if (numelements > 0) {
258 new_seekhead->filepos = url_ftell(pb);
cfde5d18
DC
259 // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
260 // and size, and 3 bytes to guarantee that an EBML void element
261 // will fit afterwards
baf71dca 262 new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
967d815a
DC
263 new_seekhead->max_entries = numelements;
264 put_ebml_void(pb, new_seekhead->reserved_size);
265 }
266 return new_seekhead;
267}
268
269static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
270{
271 mkv_seekhead_entry *entries = seekhead->entries;
967d815a
DC
272
273 // don't store more elements than we reserved space for
274 if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
275 return -1;
276
277 entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
278 if (entries == NULL)
0b38843a 279 return AVERROR(ENOMEM);
967d815a 280
91ca9690
DC
281 entries[seekhead->num_entries ].elementid = elementid;
282 entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
967d815a
DC
283
284 seekhead->entries = entries;
967d815a
DC
285 return 0;
286}
287
57848e9a 288/**
cfde5d18
DC
289 * Write the seek head to the file and free it. If a maximum number of
290 * elements was specified to mkv_start_seekhead(), the seek head will
291 * be written at the location reserved for it. Otherwise, it is written
292 * at the current location in the file.
57848e9a 293 *
ab332d01 294 * @return The file offset where the seekhead was written.
57848e9a 295 */
bc5c918e 296static int64_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
967d815a 297{
baf71dca 298 ebml_master metaseek, seekentry;
bc5c918e 299 int64_t currentpos;
967d815a
DC
300 int i;
301
302 currentpos = url_ftell(pb);
303
304 if (seekhead->reserved_size > 0)
305 url_fseek(pb, seekhead->filepos, SEEK_SET);
306
baf71dca 307 metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
967d815a
DC
308 for (i = 0; i < seekhead->num_entries; i++) {
309 mkv_seekhead_entry *entry = &seekhead->entries[i];
310
baf71dca 311 seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
967d815a
DC
312
313 put_ebml_id(pb, MATROSKA_ID_SEEKID);
0f651e8c 314 put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
967d815a
DC
315 put_ebml_id(pb, entry->elementid);
316
317 put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
318 end_ebml_master(pb, seekentry);
319 }
320 end_ebml_master(pb, metaseek);
321
322 if (seekhead->reserved_size > 0) {
323 uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb);
324 put_ebml_void(pb, remaining);
325 url_fseek(pb, currentpos, SEEK_SET);
326
327 currentpos = seekhead->filepos;
328 }
329 av_free(seekhead->entries);
330 av_free(seekhead);
331
332 return currentpos;
333}
334
bc5c918e 335static mkv_cues * mkv_start_cues(int64_t segment_offset)
6364d534
DC
336{
337 mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
338 if (cues == NULL)
339 return NULL;
340
341 cues->segment_offset = segment_offset;
342 return cues;
343}
344
bc5c918e 345static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, int64_t cluster_pos)
6364d534
DC
346{
347 mkv_cuepoint *entries = cues->entries;
6364d534
DC
348
349 entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
350 if (entries == NULL)
0b38843a 351 return AVERROR(ENOMEM);
6364d534 352
91ca9690
DC
353 entries[cues->num_entries ].pts = pkt->pts;
354 entries[cues->num_entries ].tracknum = pkt->stream_index + 1;
355 entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
6364d534
DC
356
357 cues->entries = entries;
6364d534
DC
358 return 0;
359}
360
bc5c918e 361static int64_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks)
6364d534 362{
baf71dca 363 ebml_master cues_element;
bc5c918e 364 int64_t currentpos;
6364d534
DC
365 int i, j;
366
367 currentpos = url_ftell(pb);
baf71dca 368 cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
6364d534
DC
369
370 for (i = 0; i < cues->num_entries; i++) {
baf71dca 371 ebml_master cuepoint, track_positions;
6364d534
DC
372 mkv_cuepoint *entry = &cues->entries[i];
373 uint64_t pts = entry->pts;
374
baf71dca 375 cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
6364d534
DC
376 put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
377
378 // put all the entries from different tracks that have the exact same
379 // timestamp into the same CuePoint
380 for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
baf71dca 381 track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
6364d534
DC
382 put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
383 put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
384 end_ebml_master(pb, track_positions);
385 }
386 i += j - 1;
387 end_ebml_master(pb, cuepoint);
388 }
389 end_ebml_master(pb, cues_element);
390
391 av_free(cues->entries);
392 av_free(cues);
393 return currentpos;
394}
395
b62a33d0 396static int put_xiph_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
56d55a3b 397{
56d55a3b
DC
398 uint8_t *header_start[3];
399 int header_len[3];
400 int first_header_size;
86be6637 401 int j;
56d55a3b
DC
402
403 if (codec->codec_id == CODEC_ID_VORBIS)
404 first_header_size = 30;
405 else
406 first_header_size = 42;
407
408 if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
409 first_header_size, header_start, header_len) < 0) {
b62a33d0 410 av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
56d55a3b
DC
411 return -1;
412 }
413
56d55a3b
DC
414 put_byte(pb, 2); // number packets - 1
415 for (j = 0; j < 2; j++) {
86be6637 416 put_xiph_size(pb, header_len[j]);
56d55a3b
DC
417 }
418 for (j = 0; j < 3; j++)
419 put_buffer(pb, header_start[j], header_len[j]);
801edb42
DC
420
421 return 0;
56d55a3b 422}
67143c0f 423
b62a33d0 424static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
07918a22 425{
07918a22
DC
426 int sri;
427
428 if (codec->extradata_size < 2) {
ab332d01 429 av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n");
07918a22
DC
430 return;
431 }
432
433 sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
434 if (sri > 12) {
b62a33d0 435 av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n");
07918a22
DC
436 return;
437 }
7bfacd4e 438 *sample_rate = ff_mpeg4audio_sample_rates[sri];
07918a22
DC
439
440 // if sbr, get output sample rate as well
441 if (codec->extradata_size == 5) {
442 sri = (codec->extradata[4] >> 3) & 0xF;
443 if (sri > 12) {
b62a33d0 444 av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n");
07918a22
DC
445 return;
446 }
7bfacd4e 447 *output_sample_rate = ff_mpeg4audio_sample_rates[sri];
07918a22
DC
448 }
449}
450
f009e36f 451static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
5c559894 452{
899681cd 453 ByteIOContext *dyn_cp;
46d18a88 454 uint8_t *codecpriv;
899681cd 455 int ret, codecpriv_size;
46d18a88 456
899681cd
BA
457 ret = url_open_dyn_buf(&dyn_cp);
458 if(ret < 0)
459 return ret;
5c559894
DC
460
461 if (native_id) {
c301d5ae 462 if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA)
899681cd 463 ret = put_xiph_codecpriv(s, dyn_cp, codec);
c301d5ae 464 else if (codec->codec_id == CODEC_ID_FLAC)
2578326f 465 ret = ff_flac_write_header(dyn_cp, codec);
aacc5f22 466 else if (codec->codec_id == CODEC_ID_H264)
9ab3f71b 467 ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
c301d5ae 468 else if (codec->extradata_size)
899681cd 469 put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
5c559894 470 } else if (codec->codec_type == CODEC_TYPE_VIDEO) {
f009e36f
AJ
471 if (qt_id) {
472 if (!codec->codec_tag)
1a40491e 473 codec->codec_tag = ff_codec_get_tag(codec_movvideo_tags, codec->codec_id);
f009e36f
AJ
474 if (codec->extradata_size)
475 put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
476 } else {
5c559894 477 if (!codec->codec_tag)
1a40491e 478 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
dc4a9f67 479 if (!codec->codec_tag) {
ab332d01 480 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.");
dc4a9f67
DC
481 ret = -1;
482 }
5c559894 483
1a40491e 484 ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
f009e36f 485 }
5c559894
DC
486
487 } else if (codec->codec_type == CODEC_TYPE_AUDIO) {
dc4a9f67 488 if (!codec->codec_tag)
1a40491e 489 codec->codec_tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
5c559894 490 if (!codec->codec_tag) {
ab332d01 491 av_log(s, AV_LOG_ERROR, "No wav codec ID found.");
46d18a88 492 ret = -1;
5c559894
DC
493 }
494
1a40491e 495 ff_put_wav_header(dyn_cp, codec);
5c559894 496 }
46d18a88 497
899681cd 498 codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv);
46d18a88
DC
499 if (codecpriv_size)
500 put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
501 av_free(codecpriv);
502 return ret;
5c559894
DC
503}
504
5034ab90 505static int mkv_write_tracks(AVFormatContext *s)
67143c0f
DC
506{
507 MatroskaMuxContext *mkv = s->priv_data;
899681cd 508 ByteIOContext *pb = s->pb;
baf71dca 509 ebml_master tracks;
6d588ecd 510 int i, j, ret;
67143c0f 511
6d588ecd
DC
512 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb));
513 if (ret < 0) return ret;
967d815a 514
baf71dca 515 tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
67143c0f
DC
516 for (i = 0; i < s->nb_streams; i++) {
517 AVStream *st = s->streams[i];
f622c4f4 518 AVCodecContext *codec = st->codec;
baf71dca 519 ebml_master subinfo, track;
f622c4f4 520 int native_id = 0;
f009e36f 521 int qt_id = 0;
d22f88cb 522 int bit_depth = av_get_bits_per_sample(codec->codec_id);
07918a22
DC
523 int sample_rate = codec->sample_rate;
524 int output_sample_rate = 0;
5e565998 525 AVMetadataTag *tag;
07918a22 526
a6da1aa0
DC
527 if (!bit_depth)
528 bit_depth = av_get_bits_per_sample_format(codec->sample_fmt);
529
07918a22 530 if (codec->codec_id == CODEC_ID_AAC)
b62a33d0 531 get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
f622c4f4 532
baf71dca 533 track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
815eb6a2
DC
534 put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
535 put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
f622c4f4 536 put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
e380b918 537 put_ebml_float(pb, MATROSKA_ID_TRACKTIMECODESCALE, 1.0);
f622c4f4 538
5e565998
AJ
539 if ((tag = av_metadata_get(st->metadata, "description", NULL, 0)))
540 put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
541 tag = av_metadata_get(st->metadata, "language", NULL, 0);
542 put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
f622c4f4 543
1c3db2aa 544 if (st->disposition)
3194b004 545 put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
90c2295b 546
ab332d01 547 // look for a codec ID string specific to mkv to use,
cfde5d18 548 // if none are found, use AVI codes
f622c4f4
DC
549 for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
550 if (ff_mkv_codec_tags[j].id == codec->codec_id) {
551 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
552 native_id = 1;
553 break;
554 }
555 }
556
f622c4f4
DC
557 switch (codec->codec_type) {
558 case CODEC_TYPE_VIDEO:
559 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
560
f009e36f 561 if (!native_id &&
1a40491e
DV
562 ff_codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
563 (!ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id)
f009e36f
AJ
564 || codec->codec_id == CODEC_ID_SVQ1
565 || codec->codec_id == CODEC_ID_SVQ3
566 || codec->codec_id == CODEC_ID_CINEPAK))
567 qt_id = 1;
568
569 if (qt_id)
570 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
571 else if (!native_id)
ab332d01 572 // if there is no mkv-specific codec ID, use VFW mode
cc8be506 573 put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
c301d5ae 574
baf71dca 575 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
f622c4f4
DC
576 // XXX: interlace flag?
577 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
578 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
59729451
AJ
579 if (st->sample_aspect_ratio.num) {
580 int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
581 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
582 put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
7332addd 583 }
f622c4f4
DC
584 end_ebml_master(pb, subinfo);
585 break;
586
587 case CODEC_TYPE_AUDIO:
588 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
589
c301d5ae 590 if (!native_id)
1a302a5c 591 // no mkv-specific ID, use ACM mode
cc8be506 592 put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
c301d5ae 593
baf71dca 594 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
f622c4f4 595 put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
07918a22
DC
596 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
597 if (output_sample_rate)
598 put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
44008871
DC
599 if (bit_depth)
600 put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
f622c4f4
DC
601 end_ebml_master(pb, subinfo);
602 break;
603
47e08c58
DC
604 case CODEC_TYPE_SUBTITLE:
605 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
606 break;
f622c4f4 607 default:
3967eb52 608 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.");
f622c4f4
DC
609 break;
610 }
f009e36f 611 ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
5c559894
DC
612 if (ret < 0) return ret;
613
67143c0f 614 end_ebml_master(pb, track);
f622c4f4
DC
615
616 // ms precision is the de-facto standard timescale for mkv files
617 av_set_pts_info(st, 64, 1, 1000);
67143c0f
DC
618 }
619 end_ebml_master(pb, tracks);
801edb42 620 return 0;
5034ab90
DC
621}
622
2bd0758e
AK
623static int mkv_write_chapters(AVFormatContext *s)
624{
625 MatroskaMuxContext *mkv = s->priv_data;
626 ByteIOContext *pb = s->pb;
627 ebml_master chapters, editionentry;
628 AVRational scale = {1, 1E9};
629 int i, ret;
630
631 if (!s->nb_chapters)
632 return 0;
633
634 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, url_ftell(pb));
635 if (ret < 0) return ret;
636
637 chapters = start_ebml_master(pb, MATROSKA_ID_CHAPTERS , 0);
638 editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
639 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
640 put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
641 for (i = 0; i < s->nb_chapters; i++) {
642 ebml_master chapteratom, chapterdisplay;
643 AVChapter *c = s->chapters[i];
644 AVMetadataTag *t = NULL;
645
646 chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
647 put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
648 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
649 av_rescale_q(c->start, c->time_base, scale));
650 put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
651 av_rescale_q(c->end, c->time_base, scale));
652 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
653 put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
654 if ((t = av_metadata_get(c->metadata, "title", NULL, 0))) {
655 chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
656 put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
657 put_ebml_string(pb, MATROSKA_ID_CHAPLANG , "und");
658 end_ebml_master(pb, chapterdisplay);
659 }
660 end_ebml_master(pb, chapteratom);
661 }
662 end_ebml_master(pb, editionentry);
663 end_ebml_master(pb, chapters);
664 return 0;
665}
666
5034ab90
DC
667static int mkv_write_header(AVFormatContext *s)
668{
669 MatroskaMuxContext *mkv = s->priv_data;
899681cd 670 ByteIOContext *pb = s->pb;
baf71dca 671 ebml_master ebml_header, segment_info;
5e565998 672 AVMetadataTag *tag;
6d588ecd 673 int ret;
5034ab90 674
541d443c
DC
675 mkv->md5_ctx = av_mallocz(av_md5_size);
676 av_md5_init(mkv->md5_ctx);
677
baf71dca 678 ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
5034ab90
DC
679 put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
680 put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
681 put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
682 put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
683 put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska");
684 put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
685 put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
686 end_ebml_master(pb, ebml_header);
687
baf71dca 688 mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
967d815a
DC
689 mkv->segment_offset = url_ftell(pb);
690
cfde5d18
DC
691 // we write 2 seek heads - one at the end of the file to point to each
692 // cluster, and one at the beginning to point to all other level one
693 // elements (including the seek head at the end of the file), which
694 // isn't more than 10 elements if we only write one of each other
695 // currently defined level 1 element
967d815a
DC
696 mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
697 mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
c35de1a1
DC
698 if (mkv->main_seekhead == NULL || mkv->cluster_seekhead == NULL)
699 return AVERROR(ENOMEM);
967d815a 700
6d588ecd
DC
701 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb));
702 if (ret < 0) return ret;
5034ab90 703
baf71dca 704 segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
5034ab90 705 put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
5e565998
AJ
706 if ((tag = av_metadata_get(s->metadata, "title", NULL, 0)))
707 put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
5034ab90 708 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
5fd35c6e 709 put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
5034ab90 710 put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
541d443c
DC
711
712 // reserve space to write the segment UID later
713 mkv->segment_uid = url_ftell(pb);
714 put_ebml_void(pb, 19);
5034ab90 715 }
4b8f58ee 716
5034ab90
DC
717 // reserve space for the duration
718 mkv->duration = 0;
719 mkv->duration_offset = url_ftell(pb);
720 put_ebml_void(pb, 11); // assumes double-precision float to be written
721 end_ebml_master(pb, segment_info);
722
6d588ecd
DC
723 ret = mkv_write_tracks(s);
724 if (ret < 0) return ret;
67143c0f 725
2bd0758e
AK
726 ret = mkv_write_chapters(s);
727 if (ret < 0) return ret;
728
6d588ecd
DC
729 ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
730 if (ret < 0) return ret;
967d815a 731
6364d534 732 mkv->cluster_pos = url_ftell(pb);
baf71dca 733 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
b1adb69c 734 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
98186e41 735 mkv->cluster_pts = 0;
b1adb69c 736
6364d534
DC
737 mkv->cues = mkv_start_cues(mkv->segment_offset);
738 if (mkv->cues == NULL)
0b38843a 739 return AVERROR(ENOMEM);
6364d534 740
8a86aaa3 741 put_flush_packet(pb);
67143c0f
DC
742 return 0;
743}
744
1bfbe8ff 745static int mkv_blockgroup_size(int pkt_size)
baf71dca 746{
1bfbe8ff 747 int size = pkt_size + 4;
0f651e8c 748 size += ebml_num_size(size);
baf71dca
DC
749 size += 2; // EBML ID for block and block duration
750 size += 8; // max size of block duration
0f651e8c 751 size += ebml_num_size(size);
baf71dca
DC
752 size += 1; // blockgroup EBML ID
753 return size;
754}
755
b7f4e76d
AJ
756static int ass_get_duration(const uint8_t *p)
757{
758 int sh, sm, ss, sc, eh, em, es, ec;
759 uint64_t start, end;
760
761 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
762 &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
763 return 0;
764 start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
765 end = 3600000*eh + 60000*em + 1000*es + 10*ec;
766 return end - start;
767}
768
769static int mkv_write_ass_blocks(AVFormatContext *s, AVPacket *pkt)
770{
771 MatroskaMuxContext *mkv = s->priv_data;
772 ByteIOContext *pb = s->pb;
773 int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
774 uint8_t *start, *end, *data = pkt->data;
775 ebml_master blockgroup;
776 char buffer[2048];
777
778 while (data_size) {
779 int duration = ass_get_duration(data);
780 max_duration = FFMAX(duration, max_duration);
781 end = memchr(data, '\n', data_size);
782 size = line_size = end ? end-data+1 : data_size;
783 size -= end ? (end[-1]=='\r')+1 : 0;
784 start = data;
785 for (i=0; i<3; i++, start++)
786 if (!(start = memchr(start, ',', size-(start-data))))
787 return max_duration;
788 size -= start - data;
789 sscanf(data, "Dialogue: %d,", &layer);
790 i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
791 s->streams[pkt->stream_index]->nb_frames++, layer);
792 size = FFMIN(i+size, sizeof(buffer));
793 memcpy(buffer+i, start, size-i);
794
795 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
796 "pts %" PRId64 ", duration %d\n",
797 url_ftell(pb), size, pkt->pts, duration);
798 blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
799 put_ebml_id(pb, MATROSKA_ID_BLOCK);
800 put_ebml_num(pb, size+4, 0);
801 put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
802 put_be16(pb, pkt->pts - mkv->cluster_pts);
803 put_byte(pb, 0);
804 put_buffer(pb, buffer, size);
805 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
806 end_ebml_master(pb, blockgroup);
807
808 data += line_size;
809 data_size -= line_size;
810 }
811
812 return max_duration;
813}
814
95527e06
DC
815static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
816{
817 MatroskaMuxContext *mkv = s->priv_data;
899681cd 818 ByteIOContext *pb = s->pb;
0a63a676 819 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
5f8bae8d
AJ
820 uint8_t *data = NULL;
821 int size = pkt->size;
95527e06 822
8ffc5f9e
DC
823 av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
824 "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
c1f5aa21 825 url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
5f8bae8d
AJ
826 if (codec->codec_id == CODEC_ID_H264 && codec->extradata_size > 0 &&
827 (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
828 ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
829 else
830 data = pkt->data;
95527e06 831 put_ebml_id(pb, blockid);
5f8bae8d 832 put_ebml_num(pb, size+4, 0);
95527e06
DC
833 put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
834 put_be16(pb, pkt->pts - mkv->cluster_pts);
835 put_byte(pb, flags);
5f8bae8d
AJ
836 put_buffer(pb, data, size);
837 if (data != pkt->data)
838 av_free(data);
95527e06
DC
839}
840
67143c0f
DC
841static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
842{
98186e41 843 MatroskaMuxContext *mkv = s->priv_data;
899681cd 844 ByteIOContext *pb = s->pb;
9245c5ca 845 AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
357eba6f 846 int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
62c24705 847 int duration = pkt->duration;
6d588ecd 848 int ret;
b1adb69c 849
98186e41 850 // start a new cluster every 5 MB or 5 sec
cce800b4 851 if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
8ffc5f9e
DC
852 av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
853 " bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts);
98186e41 854 end_ebml_master(pb, mkv->cluster);
967d815a 855
6d588ecd
DC
856 ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
857 if (ret < 0) return ret;
967d815a 858
6364d534 859 mkv->cluster_pos = url_ftell(pb);
baf71dca 860 mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
98186e41
DC
861 put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
862 mkv->cluster_pts = pkt->pts;
541d443c 863 av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
98186e41
DC
864 }
865
9245c5ca 866 if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
56e4540d 867 mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
b7f4e76d
AJ
868 } else if (codec->codec_id == CODEC_ID_SSA) {
869 duration = mkv_write_ass_blocks(s, pkt);
663a5d9d 870 } else {
1bfbe8ff 871 ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
62c24705 872 duration = pkt->convergence_duration;
663a5d9d 873 mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
291902c2 874 put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
663a5d9d
DC
875 end_ebml_master(pb, blockgroup);
876 }
02f487fc 877
9245c5ca 878 if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
6d588ecd
DC
879 ret = mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos);
880 if (ret < 0) return ret;
6364d534
DC
881 }
882
62c24705 883 mkv->duration = FFMAX(mkv->duration, pkt->pts + duration);
67143c0f
DC
884 return 0;
885}
886
887static int mkv_write_trailer(AVFormatContext *s)
888{
889 MatroskaMuxContext *mkv = s->priv_data;
899681cd 890 ByteIOContext *pb = s->pb;
bc5c918e 891 int64_t currentpos, second_seekhead, cuespos;
9e2a3e22 892 int ret;
02f487fc 893
b1adb69c 894 end_ebml_master(pb, mkv->cluster);
02f487fc 895
ac9e1177 896 if (!url_is_streamed(pb)) {
e5c29287
DC
897 cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
898 second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
6364d534 899
e5c29287
DC
900 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
901 if (ret < 0) return ret;
902 ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
903 if (ret < 0) return ret;
904 mkv_write_seekhead(pb, mkv->main_seekhead);
905
906 // update the duration
907 av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
908 currentpos = url_ftell(pb);
909 url_fseek(pb, mkv->duration_offset, SEEK_SET);
910 put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
911
912 // write the md5sum of some frames as the segment UID
913 if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
914 uint8_t segment_uid[16];
915 av_md5_final(mkv->md5_ctx, segment_uid);
916 url_fseek(pb, mkv->segment_uid, SEEK_SET);
917 put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
918 }
919 url_fseek(pb, currentpos, SEEK_SET);
ac9e1177 920 }
02f487fc 921
67143c0f 922 end_ebml_master(pb, mkv->segment);
541d443c 923 av_free(mkv->md5_ctx);
8a86aaa3 924 put_flush_packet(pb);
67143c0f
DC
925 return 0;
926}
927
928AVOutputFormat matroska_muxer = {
929 "matroska",
bde15e74 930 NULL_IF_CONFIG_SMALL("Matroska file format"),
67143c0f
DC
931 "video/x-matroska",
932 "mkv",
933 sizeof(MatroskaMuxContext),
934 CODEC_ID_MP2,
935 CODEC_ID_MPEG4,
936 mkv_write_header,
937 mkv_write_packet,
938 mkv_write_trailer,
25918212 939 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
1a40491e 940 .codec_tag = (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
c635497c 941 .subtitle_codec = CODEC_ID_TEXT,
67143c0f 942};
55c151ef
DC
943
944AVOutputFormat matroska_audio_muxer = {
945 "matroska",
bde15e74 946 NULL_IF_CONFIG_SMALL("Matroska file format"),
55c151ef
DC
947 "audio/x-matroska",
948 "mka",
949 sizeof(MatroskaMuxContext),
950 CODEC_ID_MP2,
951 CODEC_ID_NONE,
952 mkv_write_header,
953 mkv_write_packet,
954 mkv_write_trailer,
abce34d9 955 .flags = AVFMT_GLOBALHEADER,
1a40491e 956 .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
55c151ef 957};