1 /*
2 * FLV muxer
3 * Copyright (c) 2003 The FFmpeg Project
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 "libavutil/intreadwrite.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/intfloat.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/mathematics.h"
27 #include "avio_internal.h"
28 #include "avio.h"
29 #include "avc.h"
30 #include "avformat.h"
31 #include "flv.h"
32 #include "internal.h"
33 #include "metadata.h"
34 #include "libavutil/opt.h"
35 #include "libavcodec/put_bits.h"
36 #include "libavcodec/aacenctab.h"
37
38
39 static const AVCodecTag flv_video_codec_ids[] = {
40 { AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
41 { AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
42 { AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
43 { AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
44 { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
45 { AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
46 { AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
47 { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
48 { AV_CODEC_ID_H264, FLV_CODECID_H264 },
49 { AV_CODEC_ID_NONE, 0 }
50 };
51
52 static const AVCodecTag flv_audio_codec_ids[] = {
53 { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
54 { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
55 { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
56 { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
57 { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
58 { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
59 { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
60 { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
61 { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
62 { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
63 { AV_CODEC_ID_NONE, 0 }
64 };
65
66 typedef enum {
67 FLV_AAC_SEQ_HEADER_DETECT = (1 << 0),
68 FLV_NO_SEQUENCE_END = (1 << 1),
69 FLV_ADD_KEYFRAME_INDEX = (1 << 2),
70 FLV_NO_METADATA = (1 << 3),
71 FLV_NO_DURATION_FILESIZE = (1 << 4),
72 } FLVFlags;
73
74 typedef struct FLVFileposition {
75 int64_t keyframe_position;
76 double keyframe_timestamp;
77 struct FLVFileposition *next;
78 } FLVFileposition;
79
80 typedef struct FLVContext {
81 AVClass *av_class;
82 int reserved;
83 int64_t duration_offset;
84 int64_t filesize_offset;
85 int64_t duration;
86 int64_t delay; ///< first dts delay (needed for AVC & Speex)
87
88 int64_t datastart_offset;
89 int64_t datasize_offset;
90 int64_t datasize;
91 int64_t videosize_offset;
92 int64_t videosize;
93 int64_t audiosize_offset;
94 int64_t audiosize;
95
96 int64_t metadata_size_pos;
97 int64_t metadata_totalsize_pos;
98 int64_t metadata_totalsize;
99 int64_t keyframe_index_size;
100
101 int64_t lasttimestamp_offset;
102 double lasttimestamp;
103 int64_t lastkeyframetimestamp_offset;
104 double lastkeyframetimestamp;
105 int64_t lastkeyframelocation_offset;
106 int64_t lastkeyframelocation;
107
108 int acurframeindex;
109 int64_t keyframes_info_offset;
110
111 int64_t filepositions_count;
112 FLVFileposition *filepositions;
113 FLVFileposition *head_filepositions;
114
115 AVCodecParameters *audio_par;
116 AVCodecParameters *video_par;
117 double framerate;
118 AVCodecParameters *data_par;
119
120 int flags;
121 } FLVContext;
122
123 typedef struct FLVStreamContext {
124 int64_t last_ts; ///< last timestamp for each stream
125 } FLVStreamContext;
126
get_audio_flags(AVFormatContext * s,AVCodecParameters * par)127 static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par)
128 {
129 int flags = (par->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
130 : FLV_SAMPLESSIZE_8BIT;
131
132 if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
133 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
134 FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
135 else if (par->codec_id == AV_CODEC_ID_SPEEX) {
136 if (par->sample_rate != 16000) {
137 av_log(s, AV_LOG_ERROR,
138 "FLV only supports wideband (16kHz) Speex audio\n");
139 return AVERROR(EINVAL);
140 }
141 if (par->channels != 1) {
142 av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
143 return AVERROR(EINVAL);
144 }
145 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
146 } else {
147 switch (par->sample_rate) {
148 case 48000:
149 // 48khz mp3 is stored with 44k1 samplerate identifer
150 if (par->codec_id == AV_CODEC_ID_MP3) {
151 flags |= FLV_SAMPLERATE_44100HZ;
152 break;
153 } else {
154 goto error;
155 }
156 case 44100:
157 flags |= FLV_SAMPLERATE_44100HZ;
158 break;
159 case 22050:
160 flags |= FLV_SAMPLERATE_22050HZ;
161 break;
162 case 11025:
163 flags |= FLV_SAMPLERATE_11025HZ;
164 break;
165 case 16000: // nellymoser only
166 case 8000: // nellymoser only
167 case 5512: // not MP3
168 if (par->codec_id != AV_CODEC_ID_MP3) {
169 flags |= FLV_SAMPLERATE_SPECIAL;
170 break;
171 }
172 default:
173 error:
174 av_log(s, AV_LOG_ERROR,
175 "FLV does not support sample rate %d, "
176 "choose from (44100, 22050, 11025)\n", par->sample_rate);
177 return AVERROR(EINVAL);
178 }
179 }
180
181 if (par->channels > 1)
182 flags |= FLV_STEREO;
183
184 switch (par->codec_id) {
185 case AV_CODEC_ID_MP3:
186 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
187 break;
188 case AV_CODEC_ID_PCM_U8:
189 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
190 break;
191 case AV_CODEC_ID_PCM_S16BE:
192 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
193 break;
194 case AV_CODEC_ID_PCM_S16LE:
195 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
196 break;
197 case AV_CODEC_ID_ADPCM_SWF:
198 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
199 break;
200 case AV_CODEC_ID_NELLYMOSER:
201 if (par->sample_rate == 8000)
202 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
203 else if (par->sample_rate == 16000)
204 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
205 else
206 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
207 break;
208 case AV_CODEC_ID_PCM_MULAW:
209 flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
210 break;
211 case AV_CODEC_ID_PCM_ALAW:
212 flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
213 break;
214 case 0:
215 flags |= par->codec_tag << 4;
216 break;
217 default:
218 av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
219 avcodec_get_name(par->codec_id));
220 return AVERROR(EINVAL);
221 }
222
223 return flags;
224 }
225
put_amf_string(AVIOContext * pb,const char * str)226 static void put_amf_string(AVIOContext *pb, const char *str)
227 {
228 size_t len = strlen(str);
229 avio_wb16(pb, len);
230 avio_write(pb, str, len);
231 }
232
233 // FLV timestamps are 32 bits signed, RTMP timestamps should be 32-bit unsigned
put_timestamp(AVIOContext * pb,int64_t ts)234 static void put_timestamp(AVIOContext *pb, int64_t ts) {
235 avio_wb24(pb, ts & 0xFFFFFF);
236 avio_w8(pb, (ts >> 24) & 0x7F);
237 }
238
put_avc_eos_tag(AVIOContext * pb,unsigned ts)239 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
240 {
241 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
242 avio_wb24(pb, 5); /* Tag Data Size */
243 put_timestamp(pb, ts);
244 avio_wb24(pb, 0); /* StreamId = 0 */
245 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
246 avio_w8(pb, 2); /* AVC end of sequence */
247 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
248 avio_wb32(pb, 16); /* Size of FLV tag */
249 }
250
put_amf_double(AVIOContext * pb,double d)251 static void put_amf_double(AVIOContext *pb, double d)
252 {
253 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
254 avio_wb64(pb, av_double2int(d));
255 }
256
put_amf_byte(AVIOContext * pb,unsigned char abyte)257 static void put_amf_byte(AVIOContext *pb, unsigned char abyte)
258 {
259 avio_w8(pb, abyte);
260 }
261
put_amf_dword_array(AVIOContext * pb,uint32_t dw)262 static void put_amf_dword_array(AVIOContext *pb, uint32_t dw)
263 {
264 avio_w8(pb, AMF_DATA_TYPE_ARRAY);
265 avio_wb32(pb, dw);
266 }
267
put_amf_bool(AVIOContext * pb,int b)268 static void put_amf_bool(AVIOContext *pb, int b)
269 {
270 avio_w8(pb, AMF_DATA_TYPE_BOOL);
271 avio_w8(pb, !!b);
272 }
273
write_metadata(AVFormatContext * s,unsigned int ts)274 static void write_metadata(AVFormatContext *s, unsigned int ts)
275 {
276 AVIOContext *pb = s->pb;
277 FLVContext *flv = s->priv_data;
278 int write_duration_filesize = !(flv->flags & FLV_NO_DURATION_FILESIZE);
279 int metadata_count = 0;
280 int64_t metadata_count_pos;
281 AVDictionaryEntry *tag = NULL;
282
283 /* write meta_tag */
284 avio_w8(pb, FLV_TAG_TYPE_META); // tag type META
285 flv->metadata_size_pos = avio_tell(pb);
286 avio_wb24(pb, 0); // size of data part (sum of all parts below)
287 avio_wb24(pb, ts); // timestamp
288 avio_wb32(pb, 0); // reserved
289
290 /* now data of data_size size */
291
292 /* first event name as a string */
293 avio_w8(pb, AMF_DATA_TYPE_STRING);
294 put_amf_string(pb, "onMetaData"); // 12 bytes
295
296 /* mixed array (hash) with size and string/type/data tuples */
297 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
298 metadata_count_pos = avio_tell(pb);
299 metadata_count = 4 * !!flv->video_par +
300 5 * !!flv->audio_par +
301 1 * !!flv->data_par;
302 if (write_duration_filesize) {
303 metadata_count += 2; // +2 for duration and file size
304 }
305 avio_wb32(pb, metadata_count);
306
307 if (write_duration_filesize) {
308 put_amf_string(pb, "duration");
309 flv->duration_offset = avio_tell(pb);
310 // fill in the guessed duration, it'll be corrected later if incorrect
311 put_amf_double(pb, s->duration / AV_TIME_BASE);
312 }
313
314 if (flv->video_par) {
315 put_amf_string(pb, "width");
316 put_amf_double(pb, flv->video_par->width);
317
318 put_amf_string(pb, "height");
319 put_amf_double(pb, flv->video_par->height);
320
321 put_amf_string(pb, "videodatarate");
322 put_amf_double(pb, flv->video_par->bit_rate / 1024.0);
323
324 if (flv->framerate != 0.0) {
325 put_amf_string(pb, "framerate");
326 put_amf_double(pb, flv->framerate);
327 metadata_count++;
328 }
329
330 put_amf_string(pb, "videocodecid");
331 put_amf_double(pb, flv->video_par->codec_tag);
332 }
333
334 if (flv->audio_par) {
335 put_amf_string(pb, "audiodatarate");
336 put_amf_double(pb, flv->audio_par->bit_rate / 1024.0);
337
338 put_amf_string(pb, "audiosamplerate");
339 put_amf_double(pb, flv->audio_par->sample_rate);
340
341 put_amf_string(pb, "audiosamplesize");
342 put_amf_double(pb, flv->audio_par->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
343
344 put_amf_string(pb, "stereo");
345 put_amf_bool(pb, flv->audio_par->channels == 2);
346
347 put_amf_string(pb, "audiocodecid");
348 put_amf_double(pb, flv->audio_par->codec_tag);
349 }
350
351 if (flv->data_par) {
352 put_amf_string(pb, "datastream");
353 put_amf_double(pb, 0.0);
354 }
355
356 ff_standardize_creation_time(s);
357 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
358 if( !strcmp(tag->key, "width")
359 ||!strcmp(tag->key, "height")
360 ||!strcmp(tag->key, "videodatarate")
361 ||!strcmp(tag->key, "framerate")
362 ||!strcmp(tag->key, "videocodecid")
363 ||!strcmp(tag->key, "audiodatarate")
364 ||!strcmp(tag->key, "audiosamplerate")
365 ||!strcmp(tag->key, "audiosamplesize")
366 ||!strcmp(tag->key, "stereo")
367 ||!strcmp(tag->key, "audiocodecid")
368 ||!strcmp(tag->key, "duration")
369 ||!strcmp(tag->key, "onMetaData")
370 ||!strcmp(tag->key, "datasize")
371 ||!strcmp(tag->key, "lasttimestamp")
372 ||!strcmp(tag->key, "totalframes")
373 ||!strcmp(tag->key, "hasAudio")
374 ||!strcmp(tag->key, "hasVideo")
375 ||!strcmp(tag->key, "hasCuePoints")
376 ||!strcmp(tag->key, "hasMetadata")
377 ||!strcmp(tag->key, "hasKeyframes")
378 ){
379 av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
380 continue;
381 }
382 put_amf_string(pb, tag->key);
383 avio_w8(pb, AMF_DATA_TYPE_STRING);
384 put_amf_string(pb, tag->value);
385 metadata_count++;
386 }
387
388 if (write_duration_filesize) {
389 put_amf_string(pb, "filesize");
390 flv->filesize_offset = avio_tell(pb);
391 put_amf_double(pb, 0); // delayed write
392 }
393
394 if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
395 flv->acurframeindex = 0;
396 flv->keyframe_index_size = 0;
397
398 put_amf_string(pb, "hasVideo");
399 put_amf_bool(pb, !!flv->video_par);
400 metadata_count++;
401
402 put_amf_string(pb, "hasKeyframes");
403 put_amf_bool(pb, 1);
404 metadata_count++;
405
406 put_amf_string(pb, "hasAudio");
407 put_amf_bool(pb, !!flv->audio_par);
408 metadata_count++;
409
410 put_amf_string(pb, "hasMetadata");
411 put_amf_bool(pb, 1);
412 metadata_count++;
413
414 put_amf_string(pb, "canSeekToEnd");
415 put_amf_bool(pb, 1);
416 metadata_count++;
417
418 put_amf_string(pb, "datasize");
419 flv->datasize_offset = avio_tell(pb);
420 flv->datasize = 0;
421 put_amf_double(pb, flv->datasize);
422 metadata_count++;
423
424 put_amf_string(pb, "videosize");
425 flv->videosize_offset = avio_tell(pb);
426 flv->videosize = 0;
427 put_amf_double(pb, flv->videosize);
428 metadata_count++;
429
430 put_amf_string(pb, "audiosize");
431 flv->audiosize_offset = avio_tell(pb);
432 flv->audiosize = 0;
433 put_amf_double(pb, flv->audiosize);
434 metadata_count++;
435
436 put_amf_string(pb, "lasttimestamp");
437 flv->lasttimestamp_offset = avio_tell(pb);
438 flv->lasttimestamp = 0;
439 put_amf_double(pb, 0);
440 metadata_count++;
441
442 put_amf_string(pb, "lastkeyframetimestamp");
443 flv->lastkeyframetimestamp_offset = avio_tell(pb);
444 flv->lastkeyframetimestamp = 0;
445 put_amf_double(pb, 0);
446 metadata_count++;
447
448 put_amf_string(pb, "lastkeyframelocation");
449 flv->lastkeyframelocation_offset = avio_tell(pb);
450 flv->lastkeyframelocation = 0;
451 put_amf_double(pb, 0);
452 metadata_count++;
453
454 put_amf_string(pb, "keyframes");
455 put_amf_byte(pb, AMF_DATA_TYPE_OBJECT);
456 metadata_count++;
457
458 flv->keyframes_info_offset = avio_tell(pb);
459 }
460
461 put_amf_string(pb, "");
462 avio_w8(pb, AMF_END_OF_OBJECT);
463
464 /* write total size of tag */
465 flv->metadata_totalsize = avio_tell(pb) - flv->metadata_size_pos - 10;
466
467 avio_seek(pb, metadata_count_pos, SEEK_SET);
468 avio_wb32(pb, metadata_count);
469
470 avio_seek(pb, flv->metadata_size_pos, SEEK_SET);
471 avio_wb24(pb, flv->metadata_totalsize);
472 avio_skip(pb, flv->metadata_totalsize + 10 - 3);
473 flv->metadata_totalsize_pos = avio_tell(pb);
474 avio_wb32(pb, flv->metadata_totalsize + 11);
475 }
476
unsupported_codec(AVFormatContext * s,const char * type,int codec_id)477 static int unsupported_codec(AVFormatContext *s,
478 const char* type, int codec_id)
479 {
480 const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
481 av_log(s, AV_LOG_ERROR,
482 "%s codec %s not compatible with flv\n",
483 type,
484 desc ? desc->name : "unknown");
485 return AVERROR(ENOSYS);
486 }
487
flv_write_codec_header(AVFormatContext * s,AVCodecParameters * par,int64_t ts)488 static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par, int64_t ts) {
489 int64_t data_size;
490 AVIOContext *pb = s->pb;
491 FLVContext *flv = s->priv_data;
492
493 if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
494 || par->codec_id == AV_CODEC_ID_MPEG4) {
495 int64_t pos;
496 avio_w8(pb,
497 par->codec_type == AVMEDIA_TYPE_VIDEO ?
498 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
499 avio_wb24(pb, 0); // size patched later
500 put_timestamp(pb, ts);
501 avio_wb24(pb, 0); // streamid
502 pos = avio_tell(pb);
503 if (par->codec_id == AV_CODEC_ID_AAC) {
504 avio_w8(pb, get_audio_flags(s, par));
505 avio_w8(pb, 0); // AAC sequence header
506
507 if (!par->extradata_size && (flv->flags & FLV_AAC_SEQ_HEADER_DETECT)) {
508 PutBitContext pbc;
509 int samplerate_index;
510 int channels = flv->audio_par->channels
511 - (flv->audio_par->channels == 8 ? 1 : 0);
512 uint8_t data[2];
513
514 for (samplerate_index = 0; samplerate_index < 16;
515 samplerate_index++)
516 if (flv->audio_par->sample_rate
517 == mpeg4audio_sample_rates[samplerate_index])
518 break;
519
520 init_put_bits(&pbc, data, sizeof(data));
521 put_bits(&pbc, 5, flv->audio_par->profile + 1); //profile
522 put_bits(&pbc, 4, samplerate_index); //sample rate index
523 put_bits(&pbc, 4, channels);
524 put_bits(&pbc, 1, 0); //frame length - 1024 samples
525 put_bits(&pbc, 1, 0); //does not depend on core coder
526 put_bits(&pbc, 1, 0); //is not extension
527 flush_put_bits(&pbc);
528
529 avio_w8(pb, data[0]);
530 avio_w8(pb, data[1]);
531
532 av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n",
533 data[0], data[1]);
534 }
535 avio_write(pb, par->extradata, par->extradata_size);
536 } else {
537 avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
538 avio_w8(pb, 0); // AVC sequence header
539 avio_wb24(pb, 0); // composition time
540 ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
541 }
542 data_size = avio_tell(pb) - pos;
543 avio_seek(pb, -data_size - 10, SEEK_CUR);
544 avio_wb24(pb, data_size);
545 avio_skip(pb, data_size + 10 - 3);
546 avio_wb32(pb, data_size + 11); // previous tag size
547 }
548 }
549
flv_append_keyframe_info(AVFormatContext * s,FLVContext * flv,double ts,int64_t pos)550 static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double ts, int64_t pos)
551 {
552 FLVFileposition *position = av_malloc(sizeof(FLVFileposition));
553
554 if (!position) {
555 av_log(s, AV_LOG_WARNING, "no mem for add keyframe index!\n");
556 return AVERROR(ENOMEM);
557 }
558
559 position->keyframe_timestamp = ts;
560 position->keyframe_position = pos;
561
562 if (!flv->filepositions_count) {
563 flv->filepositions = position;
564 flv->head_filepositions = flv->filepositions;
565 position->next = NULL;
566 } else {
567 flv->filepositions->next = position;
568 position->next = NULL;
569 flv->filepositions = flv->filepositions->next;
570 }
571
572 flv->filepositions_count++;
573
574 return 0;
575 }
576
shift_data(AVFormatContext * s)577 static int shift_data(AVFormatContext *s)
578 {
579 int ret = 0;
580 int n = 0;
581 int64_t metadata_size = 0;
582 FLVContext *flv = s->priv_data;
583 int64_t pos, pos_end = avio_tell(s->pb); /* Save the pre-shift size. */
584 uint8_t *buf, *read_buf[2];
585 int read_buf_id = 0;
586 int read_size[2];
587 AVIOContext *read_pb;
588
589 metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */
590 metadata_size += 2 + 13; /* filepositions String */
591 metadata_size += 2 + 5; /* times String */
592 metadata_size += 3; /* Object end */
593
594 flv->keyframe_index_size = metadata_size;
595
596 if (metadata_size < 0)
597 return metadata_size;
598
599 buf = av_malloc_array(metadata_size, 2);
600 if (!buf) {
601 return AVERROR(ENOMEM);
602 }
603 read_buf[0] = buf;
604 read_buf[1] = buf + metadata_size;
605
606 avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET);
607 avio_wb24(s->pb, flv->metadata_totalsize + metadata_size);
608
609 avio_seek(s->pb, flv->metadata_totalsize_pos, SEEK_SET);
610 avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size);
611
612 /* Shift the data: the AVIO context of the output can only be used for
613 * writing, so we re-open the same output, but for reading. It also avoids
614 * a read/seek/write/seek back and forth. */
615 avio_flush(s->pb);
616 ret = s->io_open(s, &read_pb, s->url, AVIO_FLAG_READ, NULL);
617 if (ret < 0) {
618 av_log(s, AV_LOG_ERROR, "Unable to re-open %s output file for "
619 "the second pass (add_keyframe_index)\n", s->url);
620 goto end;
621 }
622
623 /* Get ready for writing. */
624 avio_seek(s->pb, flv->keyframes_info_offset + metadata_size, SEEK_SET);
625
626 /* start reading at where the keyframe index information will be placed */
627 avio_seek(read_pb, flv->keyframes_info_offset, SEEK_SET);
628 pos = avio_tell(read_pb);
629
630 #define READ_BLOCK do { \
631 read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
632 read_buf_id ^= 1; \
633 } while (0)
634
635 /* shift data by chunk of at most keyframe *filepositions* and *times* size */
636 READ_BLOCK;
637 do {
638 READ_BLOCK;
639 n = read_size[read_buf_id];
640 if (n < 0)
641 break;
642 avio_write(s->pb, read_buf[read_buf_id], n);
643 pos += n;
644 } while (pos <= pos_end);
645
646 ff_format_io_close(s, &read_pb);
647
648 end:
649 av_free(buf);
650 return ret;
651 }
652
flv_init(struct AVFormatContext * s)653 static int flv_init(struct AVFormatContext *s)
654 {
655 int i;
656 FLVContext *flv = s->priv_data;
657
658 for (i = 0; i < s->nb_streams; i++) {
659 AVCodecParameters *par = s->streams[i]->codecpar;
660 FLVStreamContext *sc;
661 switch (par->codec_type) {
662 case AVMEDIA_TYPE_VIDEO:
663 if (s->streams[i]->avg_frame_rate.den &&
664 s->streams[i]->avg_frame_rate.num) {
665 flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
666 }
667 if (flv->video_par) {
668 av_log(s, AV_LOG_ERROR,
669 "at most one video stream is supported in flv\n");
670 return AVERROR(EINVAL);
671 }
672 flv->video_par = par;
673 if (!ff_codec_get_tag(flv_video_codec_ids, par->codec_id))
674 return unsupported_codec(s, "Video", par->codec_id);
675
676 if (par->codec_id == AV_CODEC_ID_MPEG4 ||
677 par->codec_id == AV_CODEC_ID_H263) {
678 int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
679 av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
680 "Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(par->codec_id));
681
682 if (error) {
683 av_log(s, AV_LOG_ERROR,
684 "use vstrict=-1 / -strict -1 to use it anyway.\n");
685 return AVERROR(EINVAL);
686 }
687 } else if (par->codec_id == AV_CODEC_ID_VP6) {
688 av_log(s, AV_LOG_WARNING,
689 "Muxing VP6 in flv will produce flipped video on playback.\n");
690 }
691 break;
692 case AVMEDIA_TYPE_AUDIO:
693 if (flv->audio_par) {
694 av_log(s, AV_LOG_ERROR,
695 "at most one audio stream is supported in flv\n");
696 return AVERROR(EINVAL);
697 }
698 flv->audio_par = par;
699 if (get_audio_flags(s, par) < 0)
700 return unsupported_codec(s, "Audio", par->codec_id);
701 if (par->codec_id == AV_CODEC_ID_PCM_S16BE)
702 av_log(s, AV_LOG_WARNING,
703 "16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
704 break;
705 case AVMEDIA_TYPE_DATA:
706 if (par->codec_id != AV_CODEC_ID_TEXT && par->codec_id != AV_CODEC_ID_NONE)
707 return unsupported_codec(s, "Data", par->codec_id);
708 flv->data_par = par;
709 break;
710 case AVMEDIA_TYPE_SUBTITLE:
711 if (par->codec_id != AV_CODEC_ID_TEXT) {
712 av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n",
713 avcodec_get_name(par->codec_id), i);
714 return AVERROR_INVALIDDATA;
715 }
716 flv->data_par = par;
717 break;
718 default:
719 av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
720 av_get_media_type_string(par->codec_type), i);
721 return AVERROR(EINVAL);
722 }
723 avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
724
725 sc = av_mallocz(sizeof(FLVStreamContext));
726 if (!sc)
727 return AVERROR(ENOMEM);
728 s->streams[i]->priv_data = sc;
729 sc->last_ts = -1;
730 }
731
732 flv->delay = AV_NOPTS_VALUE;
733
734 return 0;
735 }
736
flv_write_header(AVFormatContext * s)737 static int flv_write_header(AVFormatContext *s)
738 {
739 int i;
740 AVIOContext *pb = s->pb;
741 FLVContext *flv = s->priv_data;
742
743 avio_write(pb, "FLV", 3);
744 avio_w8(pb, 1);
745 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_par +
746 FLV_HEADER_FLAG_HASVIDEO * !!flv->video_par);
747 avio_wb32(pb, 9);
748 avio_wb32(pb, 0);
749
750 for (i = 0; i < s->nb_streams; i++)
751 if (s->streams[i]->codecpar->codec_tag == 5) {
752 avio_w8(pb, 8); // message type
753 avio_wb24(pb, 0); // include flags
754 avio_wb24(pb, 0); // time stamp
755 avio_wb32(pb, 0); // reserved
756 avio_wb32(pb, 11); // size
757 flv->reserved = 5;
758 }
759
760 if (flv->flags & FLV_NO_METADATA) {
761 pb->seekable = 0;
762 } else {
763 write_metadata(s, 0);
764 }
765
766 for (i = 0; i < s->nb_streams; i++) {
767 flv_write_codec_header(s, s->streams[i]->codecpar, 0);
768 }
769
770 flv->datastart_offset = avio_tell(pb);
771 return 0;
772 }
773
flv_write_trailer(AVFormatContext * s)774 static int flv_write_trailer(AVFormatContext *s)
775 {
776 int64_t file_size;
777 AVIOContext *pb = s->pb;
778 FLVContext *flv = s->priv_data;
779 int build_keyframes_idx = flv->flags & FLV_ADD_KEYFRAME_INDEX;
780 int i, res;
781 int64_t cur_pos = avio_tell(s->pb);
782
783 if (build_keyframes_idx) {
784 FLVFileposition *newflv_posinfo, *p;
785
786 avio_seek(pb, flv->videosize_offset, SEEK_SET);
787 put_amf_double(pb, flv->videosize);
788
789 avio_seek(pb, flv->audiosize_offset, SEEK_SET);
790 put_amf_double(pb, flv->audiosize);
791
792 avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET);
793 put_amf_double(pb, flv->lasttimestamp);
794
795 avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET);
796 put_amf_double(pb, flv->lastkeyframetimestamp);
797
798 avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET);
799 put_amf_double(pb, flv->lastkeyframelocation + flv->keyframe_index_size);
800 avio_seek(pb, cur_pos, SEEK_SET);
801
802 res = shift_data(s);
803 if (res < 0) {
804 goto end;
805 }
806 avio_seek(pb, flv->keyframes_info_offset, SEEK_SET);
807 put_amf_string(pb, "filepositions");
808 put_amf_dword_array(pb, flv->filepositions_count);
809 for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
810 put_amf_double(pb, newflv_posinfo->keyframe_position + flv->keyframe_index_size);
811 }
812
813 put_amf_string(pb, "times");
814 put_amf_dword_array(pb, flv->filepositions_count);
815 for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
816 put_amf_double(pb, newflv_posinfo->keyframe_timestamp);
817 }
818
819 newflv_posinfo = flv->head_filepositions;
820 while (newflv_posinfo) {
821 p = newflv_posinfo->next;
822 if (p) {
823 newflv_posinfo->next = p->next;
824 av_free(p);
825 p = NULL;
826 } else {
827 av_free(newflv_posinfo);
828 newflv_posinfo = NULL;
829 }
830 }
831
832 put_amf_string(pb, "");
833 avio_w8(pb, AMF_END_OF_OBJECT);
834
835 avio_seek(pb, cur_pos + flv->keyframe_index_size, SEEK_SET);
836 }
837
838 end:
839 if (flv->flags & FLV_NO_SEQUENCE_END) {
840 av_log(s, AV_LOG_DEBUG, "FLV no sequence end mode open\n");
841 } else {
842 /* Add EOS tag */
843 for (i = 0; i < s->nb_streams; i++) {
844 AVCodecParameters *par = s->streams[i]->codecpar;
845 FLVStreamContext *sc = s->streams[i]->priv_data;
846 if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
847 (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
848 put_avc_eos_tag(pb, sc->last_ts);
849 }
850 }
851
852 file_size = avio_tell(pb);
853
854 if (build_keyframes_idx) {
855 flv->datasize = file_size - flv->datastart_offset;
856 avio_seek(pb, flv->datasize_offset, SEEK_SET);
857 put_amf_double(pb, flv->datasize);
858 }
859 if (!(flv->flags & FLV_NO_METADATA)) {
860 if (!(flv->flags & FLV_NO_DURATION_FILESIZE)) {
861 /* update information */
862 if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0) {
863 av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
864 } else {
865 put_amf_double(pb, flv->duration / (double)1000);
866 }
867 if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0) {
868 av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
869 } else {
870 put_amf_double(pb, file_size);
871 }
872 }
873 }
874
875 return 0;
876 }
877
flv_write_packet(AVFormatContext * s,AVPacket * pkt)878 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
879 {
880 AVIOContext *pb = s->pb;
881 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
882 FLVContext *flv = s->priv_data;
883 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
884 unsigned ts;
885 int size = pkt->size;
886 uint8_t *data = NULL;
887 int flags = -1, flags_size, ret = 0;
888 int64_t cur_offset = avio_tell(pb);
889
890 if (par->codec_type == AVMEDIA_TYPE_AUDIO && !pkt->size) {
891 av_log(s, AV_LOG_WARNING, "Empty audio Packet\n");
892 return AVERROR(EINVAL);
893 }
894
895 if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
896 par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
897 flags_size = 2;
898 else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)
899 flags_size = 5;
900 else
901 flags_size = 1;
902
903 if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
904 || par->codec_id == AV_CODEC_ID_MPEG4) {
905 buffer_size_t side_size;
906 uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
907 if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
908 ret = ff_alloc_extradata(par, side_size);
909 if (ret < 0)
910 return ret;
911 memcpy(par->extradata, side, side_size);
912 flv_write_codec_header(s, par, pkt->dts);
913 }
914 }
915
916 if (flv->delay == AV_NOPTS_VALUE)
917 flv->delay = -pkt->dts;
918
919 if (pkt->dts < -flv->delay) {
920 av_log(s, AV_LOG_WARNING,
921 "Packets are not in the proper order with respect to DTS\n");
922 return AVERROR(EINVAL);
923 }
924 if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
925 if (pkt->pts == AV_NOPTS_VALUE) {
926 av_log(s, AV_LOG_ERROR, "Packet is missing PTS\n");
927 return AVERROR(EINVAL);
928 }
929 }
930
931 ts = pkt->dts;
932
933 if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
934 write_metadata(s, ts);
935 s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
936 }
937
938 avio_write_marker(pb, av_rescale(ts, AV_TIME_BASE, 1000),
939 pkt->flags & AV_PKT_FLAG_KEY && (flv->video_par ? par->codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
940
941 switch (par->codec_type) {
942 case AVMEDIA_TYPE_VIDEO:
943 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
944
945 flags = ff_codec_get_tag(flv_video_codec_ids, par->codec_id);
946
947 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
948 break;
949 case AVMEDIA_TYPE_AUDIO:
950 flags = get_audio_flags(s, par);
951
952 av_assert0(size);
953
954 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
955 break;
956 case AVMEDIA_TYPE_SUBTITLE:
957 case AVMEDIA_TYPE_DATA:
958 avio_w8(pb, FLV_TAG_TYPE_META);
959 break;
960 default:
961 return AVERROR(EINVAL);
962 }
963
964 if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
965 /* check if extradata looks like mp4 formatted */
966 if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
967 if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
968 return ret;
969 } else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
970 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
971 if (!s->streams[pkt->stream_index]->nb_frames) {
972 av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
973 "use the audio bitstream filter 'aac_adtstoasc' to fix it "
974 "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
975 return AVERROR_INVALIDDATA;
976 }
977 av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
978 }
979
980 /* check Speex packet duration */
981 if (par->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
982 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
983 "8 frames per packet. Adobe Flash "
984 "Player cannot handle this!\n");
985
986 if (sc->last_ts < ts)
987 sc->last_ts = ts;
988
989 if (size + flags_size >= 1<<24) {
990 av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
991 size + flags_size, 1<<24);
992 ret = AVERROR(EINVAL);
993 goto fail;
994 }
995
996 avio_wb24(pb, size + flags_size);
997 put_timestamp(pb, ts);
998 avio_wb24(pb, flv->reserved);
999
1000 if (par->codec_type == AVMEDIA_TYPE_DATA ||
1001 par->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
1002 int data_size;
1003 int64_t metadata_size_pos = avio_tell(pb);
1004 if (par->codec_id == AV_CODEC_ID_TEXT) {
1005 // legacy FFmpeg magic?
1006 avio_w8(pb, AMF_DATA_TYPE_STRING);
1007 put_amf_string(pb, "onTextData");
1008 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
1009 avio_wb32(pb, 2);
1010 put_amf_string(pb, "type");
1011 avio_w8(pb, AMF_DATA_TYPE_STRING);
1012 put_amf_string(pb, "Text");
1013 put_amf_string(pb, "text");
1014 avio_w8(pb, AMF_DATA_TYPE_STRING);
1015 put_amf_string(pb, pkt->data);
1016 put_amf_string(pb, "");
1017 avio_w8(pb, AMF_END_OF_OBJECT);
1018 } else {
1019 // just pass the metadata through
1020 avio_write(pb, data ? data : pkt->data, size);
1021 }
1022 /* write total size of tag */
1023 data_size = avio_tell(pb) - metadata_size_pos;
1024 avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
1025 avio_wb24(pb, data_size);
1026 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
1027 avio_wb32(pb, data_size + 11);
1028 } else {
1029 av_assert1(flags>=0);
1030 avio_w8(pb,flags);
1031 if (par->codec_id == AV_CODEC_ID_VP6)
1032 avio_w8(pb,0);
1033 if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A) {
1034 if (par->extradata_size)
1035 avio_w8(pb, par->extradata[0]);
1036 else
1037 avio_w8(pb, ((FFALIGN(par->width, 16) - par->width) << 4) |
1038 (FFALIGN(par->height, 16) - par->height));
1039 } else if (par->codec_id == AV_CODEC_ID_AAC)
1040 avio_w8(pb, 1); // AAC raw
1041 else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
1042 avio_w8(pb, 1); // AVC NALU
1043 avio_wb24(pb, pkt->pts - pkt->dts);
1044 }
1045
1046 avio_write(pb, data ? data : pkt->data, size);
1047
1048 avio_wb32(pb, size + flags_size + 11); // previous tag size
1049 flv->duration = FFMAX(flv->duration,
1050 pkt->pts + flv->delay + pkt->duration);
1051 }
1052
1053 if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
1054 switch (par->codec_type) {
1055 case AVMEDIA_TYPE_VIDEO:
1056 flv->videosize += (avio_tell(pb) - cur_offset);
1057 flv->lasttimestamp = flv->acurframeindex / flv->framerate;
1058 flv->acurframeindex++;
1059 if (pkt->flags & AV_PKT_FLAG_KEY) {
1060 double ts = flv->lasttimestamp;
1061 int64_t pos = cur_offset;
1062
1063 flv->lastkeyframetimestamp = ts;
1064 flv->lastkeyframelocation = pos;
1065 ret = flv_append_keyframe_info(s, flv, ts, pos);
1066 if (ret < 0)
1067 goto fail;
1068 }
1069 break;
1070
1071 case AVMEDIA_TYPE_AUDIO:
1072 flv->audiosize += (avio_tell(pb) - cur_offset);
1073 break;
1074
1075 default:
1076 av_log(s, AV_LOG_WARNING, "par->codec_type is type = [%d]\n", par->codec_type);
1077 break;
1078 }
1079 }
1080 fail:
1081 av_free(data);
1082
1083 return ret;
1084 }
1085
flv_check_bitstream(struct AVFormatContext * s,const AVPacket * pkt)1086 static int flv_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
1087 {
1088 int ret = 1;
1089 AVStream *st = s->streams[pkt->stream_index];
1090
1091 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
1092 if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
1093 ret = ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
1094 }
1095 return ret;
1096 }
1097
1098 static const AVOption options[] = {
1099 { "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1100 { "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_AAC_SEQ_HEADER_DETECT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1101 { "no_sequence_end", "disable sequence end for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_SEQUENCE_END}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1102 { "no_metadata", "disable metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_METADATA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1103 { "no_duration_filesize", "disable duration and filesize zero value metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_DURATION_FILESIZE}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1104 { "add_keyframe_index", "Add keyframe index metadata", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_ADD_KEYFRAME_INDEX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1105 { NULL },
1106 };
1107
1108 static const AVClass flv_muxer_class = {
1109 .class_name = "flv muxer",
1110 .item_name = av_default_item_name,
1111 .option = options,
1112 .version = LIBAVUTIL_VERSION_INT,
1113 };
1114
1115 AVOutputFormat ff_flv_muxer = {
1116 .name = "flv",
1117 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1118 .mime_type = "video/x-flv",
1119 .extensions = "flv",
1120 .priv_data_size = sizeof(FLVContext),
1121 .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
1122 .video_codec = AV_CODEC_ID_FLV1,
1123 .init = flv_init,
1124 .write_header = flv_write_header,
1125 .write_packet = flv_write_packet,
1126 .write_trailer = flv_write_trailer,
1127 .check_bitstream= flv_check_bitstream,
1128 .codec_tag = (const AVCodecTag* const []) {
1129 flv_video_codec_ids, flv_audio_codec_ids, 0
1130 },
1131 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1132 AVFMT_TS_NONSTRICT,
1133 .priv_class = &flv_muxer_class,
1134 };
1135