3 * Copyright (c) 2003 The FFmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"
32 #include "libavutil/opt.h"
33 #include "libavcodec/put_bits.h"
34 #include "libavcodec/aacenctab.h"
37 static const AVCodecTag flv_video_codec_ids[] = {
38 { AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
39 { AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
40 { AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
41 { AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
42 { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
43 { AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
44 { AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
45 { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
46 { AV_CODEC_ID_H264, FLV_CODECID_H264 },
47 { AV_CODEC_ID_NONE, 0 }
50 static const AVCodecTag flv_audio_codec_ids[] = {
51 { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
52 { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
53 { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
54 { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
55 { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
56 { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
57 { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
58 { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
59 { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
60 { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
61 { AV_CODEC_ID_NONE, 0 }
64 typedef struct FLVContext {
67 int64_t duration_offset;
68 int64_t filesize_offset;
70 int64_t delay; ///< first dts delay (needed for AVC & Speex)
72 AVCodecParameters *audio_par;
73 AVCodecParameters *video_par;
75 AVCodecParameters *data_par;
80 typedef struct FLVStreamContext {
81 int64_t last_ts; ///< last timestamp for each stream
84 static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par)
86 int flags = (par->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
87 : FLV_SAMPLESSIZE_8BIT;
89 if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
90 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
91 FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
92 else if (par->codec_id == AV_CODEC_ID_SPEEX) {
93 if (par->sample_rate != 16000) {
94 av_log(s, AV_LOG_ERROR,
95 "FLV only supports wideband (16kHz) Speex audio\n");
96 return AVERROR(EINVAL);
98 if (par->channels != 1) {
99 av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
100 return AVERROR(EINVAL);
102 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
104 switch (par->sample_rate) {
106 flags |= FLV_SAMPLERATE_44100HZ;
109 flags |= FLV_SAMPLERATE_22050HZ;
112 flags |= FLV_SAMPLERATE_11025HZ;
114 case 16000: // nellymoser only
115 case 8000: // nellymoser only
116 case 5512: // not MP3
117 if (par->codec_id != AV_CODEC_ID_MP3) {
118 flags |= FLV_SAMPLERATE_SPECIAL;
122 av_log(s, AV_LOG_ERROR,
123 "FLV does not support sample rate %d, "
124 "choose from (44100, 22050, 11025)\n", par->sample_rate);
125 return AVERROR(EINVAL);
129 if (par->channels > 1)
132 switch (par->codec_id) {
133 case AV_CODEC_ID_MP3:
134 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
136 case AV_CODEC_ID_PCM_U8:
137 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
139 case AV_CODEC_ID_PCM_S16BE:
140 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
142 case AV_CODEC_ID_PCM_S16LE:
143 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
145 case AV_CODEC_ID_ADPCM_SWF:
146 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
148 case AV_CODEC_ID_NELLYMOSER:
149 if (par->sample_rate == 8000)
150 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
151 else if (par->sample_rate == 16000)
152 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
154 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
156 case AV_CODEC_ID_PCM_MULAW:
157 flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
159 case AV_CODEC_ID_PCM_ALAW:
160 flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
163 flags |= par->codec_tag << 4;
166 av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
167 avcodec_get_name(par->codec_id));
168 return AVERROR(EINVAL);
174 static void put_amf_string(AVIOContext *pb, const char *str)
176 size_t len = strlen(str);
178 avio_write(pb, str, len);
181 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
183 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
184 avio_wb24(pb, 5); /* Tag Data Size */
185 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
186 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
187 avio_wb24(pb, 0); /* StreamId = 0 */
188 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
189 avio_w8(pb, 2); /* AVC end of sequence */
190 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
191 avio_wb32(pb, 16); /* Size of FLV tag */
194 static void put_amf_double(AVIOContext *pb, double d)
196 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
197 avio_wb64(pb, av_double2int(d));
200 static void put_amf_bool(AVIOContext *pb, int b)
202 avio_w8(pb, AMF_DATA_TYPE_BOOL);
206 static void write_metadata(AVFormatContext *s, unsigned int ts)
208 AVIOContext *pb = s->pb;
209 FLVContext *flv = s->priv_data;
210 int metadata_count = 0;
211 int64_t metadata_size_pos, data_size, metadata_count_pos;
212 AVDictionaryEntry *tag = NULL;
215 avio_w8(pb, 18); // tag type META
216 metadata_size_pos = avio_tell(pb);
217 avio_wb24(pb, 0); // size of data part (sum of all parts below)
218 avio_wb24(pb, ts); // timestamp
219 avio_wb32(pb, 0); // reserved
221 /* now data of data_size size */
223 /* first event name as a string */
224 avio_w8(pb, AMF_DATA_TYPE_STRING);
225 put_amf_string(pb, "onMetaData"); // 12 bytes
227 /* mixed array (hash) with size and string/type/data tuples */
228 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
229 metadata_count_pos = avio_tell(pb);
230 metadata_count = 4 * !!flv->video_par +
231 5 * !!flv->audio_par +
232 1 * !!flv->data_par +
233 2; // +2 for duration and file size
235 avio_wb32(pb, metadata_count);
237 put_amf_string(pb, "duration");
238 flv->duration_offset = avio_tell(pb);
240 // fill in the guessed duration, it'll be corrected later if incorrect
241 put_amf_double(pb, s->duration / AV_TIME_BASE);
243 if (flv->video_par) {
244 put_amf_string(pb, "width");
245 put_amf_double(pb, flv->video_par->width);
247 put_amf_string(pb, "height");
248 put_amf_double(pb, flv->video_par->height);
250 put_amf_string(pb, "videodatarate");
251 put_amf_double(pb, flv->video_par->bit_rate / 1024.0);
253 if (flv->framerate != 0.0) {
254 put_amf_string(pb, "framerate");
255 put_amf_double(pb, flv->framerate);
259 put_amf_string(pb, "videocodecid");
260 put_amf_double(pb, flv->video_par->codec_tag);
263 if (flv->audio_par) {
264 put_amf_string(pb, "audiodatarate");
265 put_amf_double(pb, flv->audio_par->bit_rate / 1024.0);
267 put_amf_string(pb, "audiosamplerate");
268 put_amf_double(pb, flv->audio_par->sample_rate);
270 put_amf_string(pb, "audiosamplesize");
271 put_amf_double(pb, flv->audio_par->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
273 put_amf_string(pb, "stereo");
274 put_amf_bool(pb, flv->audio_par->channels == 2);
276 put_amf_string(pb, "audiocodecid");
277 put_amf_double(pb, flv->audio_par->codec_tag);
281 put_amf_string(pb, "datastream");
282 put_amf_double(pb, 0.0);
285 ff_standardize_creation_time(s);
286 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
287 if( !strcmp(tag->key, "width")
288 ||!strcmp(tag->key, "height")
289 ||!strcmp(tag->key, "videodatarate")
290 ||!strcmp(tag->key, "framerate")
291 ||!strcmp(tag->key, "videocodecid")
292 ||!strcmp(tag->key, "audiodatarate")
293 ||!strcmp(tag->key, "audiosamplerate")
294 ||!strcmp(tag->key, "audiosamplesize")
295 ||!strcmp(tag->key, "stereo")
296 ||!strcmp(tag->key, "audiocodecid")
297 ||!strcmp(tag->key, "duration")
298 ||!strcmp(tag->key, "onMetaData")
299 ||!strcmp(tag->key, "datasize")
300 ||!strcmp(tag->key, "lasttimestamp")
301 ||!strcmp(tag->key, "totalframes")
302 ||!strcmp(tag->key, "hasAudio")
303 ||!strcmp(tag->key, "hasVideo")
304 ||!strcmp(tag->key, "hasCuePoints")
305 ||!strcmp(tag->key, "hasMetadata")
306 ||!strcmp(tag->key, "hasKeyframes")
308 av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
311 put_amf_string(pb, tag->key);
312 avio_w8(pb, AMF_DATA_TYPE_STRING);
313 put_amf_string(pb, tag->value);
317 put_amf_string(pb, "filesize");
318 flv->filesize_offset = avio_tell(pb);
319 put_amf_double(pb, 0); // delayed write
321 put_amf_string(pb, "");
322 avio_w8(pb, AMF_END_OF_OBJECT);
324 /* write total size of tag */
325 data_size = avio_tell(pb) - metadata_size_pos - 10;
327 avio_seek(pb, metadata_count_pos, SEEK_SET);
328 avio_wb32(pb, metadata_count);
330 avio_seek(pb, metadata_size_pos, SEEK_SET);
331 avio_wb24(pb, data_size);
332 avio_skip(pb, data_size + 10 - 3);
333 avio_wb32(pb, data_size + 11);
336 static int unsupported_codec(AVFormatContext *s,
337 const char* type, int codec_id)
339 const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
340 av_log(s, AV_LOG_ERROR,
341 "%s codec %s not compatible with flv\n",
343 desc ? desc->name : "unknown");
344 return AVERROR(ENOSYS);
347 static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
349 AVIOContext *pb = s->pb;
350 FLVContext *flv = s->priv_data;
352 if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
353 || par->codec_id == AV_CODEC_ID_MPEG4) {
356 par->codec_type == AVMEDIA_TYPE_VIDEO ?
357 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
358 avio_wb24(pb, 0); // size patched later
359 avio_wb24(pb, 0); // ts
360 avio_w8(pb, 0); // ts ext
361 avio_wb24(pb, 0); // streamid
363 if (par->codec_id == AV_CODEC_ID_AAC) {
364 avio_w8(pb, get_audio_flags(s, par));
365 avio_w8(pb, 0); // AAC sequence header
367 if (!par->extradata_size && flv->flags & 1) {
369 int samplerate_index;
370 int channels = flv->audio_par->channels
371 - (flv->audio_par->channels == 8 ? 1 : 0);
374 for (samplerate_index = 0; samplerate_index < 16;
376 if (flv->audio_par->sample_rate
377 == mpeg4audio_sample_rates[samplerate_index])
380 init_put_bits(&pbc, data, sizeof(data));
381 put_bits(&pbc, 5, flv->audio_par->profile + 1); //profile
382 put_bits(&pbc, 4, samplerate_index); //sample rate index
383 put_bits(&pbc, 4, channels);
384 put_bits(&pbc, 1, 0); //frame length - 1024 samples
385 put_bits(&pbc, 1, 0); //does not depend on core coder
386 put_bits(&pbc, 1, 0); //is not extension
387 flush_put_bits(&pbc);
389 avio_w8(pb, data[0]);
390 avio_w8(pb, data[1]);
392 av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n",
395 avio_write(pb, par->extradata, par->extradata_size);
397 avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
398 avio_w8(pb, 0); // AVC sequence header
399 avio_wb24(pb, 0); // composition time
400 ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
402 data_size = avio_tell(pb) - pos;
403 avio_seek(pb, -data_size - 10, SEEK_CUR);
404 avio_wb24(pb, data_size);
405 avio_skip(pb, data_size + 10 - 3);
406 avio_wb32(pb, data_size + 11); // previous tag size
410 static int flv_write_header(AVFormatContext *s)
413 AVIOContext *pb = s->pb;
414 FLVContext *flv = s->priv_data;
416 for (i = 0; i < s->nb_streams; i++) {
417 AVCodecParameters *par = s->streams[i]->codecpar;
418 FLVStreamContext *sc;
419 switch (par->codec_type) {
420 case AVMEDIA_TYPE_VIDEO:
421 if (s->streams[i]->avg_frame_rate.den &&
422 s->streams[i]->avg_frame_rate.num) {
423 flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
425 if (flv->video_par) {
426 av_log(s, AV_LOG_ERROR,
427 "at most one video stream is supported in flv\n");
428 return AVERROR(EINVAL);
430 flv->video_par = par;
431 if (!ff_codec_get_tag(flv_video_codec_ids, par->codec_id))
432 return unsupported_codec(s, "Video", par->codec_id);
434 if (par->codec_id == AV_CODEC_ID_MPEG4 ||
435 par->codec_id == AV_CODEC_ID_H263) {
436 int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
437 av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
438 "Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(par->codec_id));
441 av_log(s, AV_LOG_ERROR,
442 "use vstrict=-1 / -strict -1 to use it anyway.\n");
443 return AVERROR(EINVAL);
445 } else if (par->codec_id == AV_CODEC_ID_VP6) {
446 av_log(s, AV_LOG_WARNING,
447 "Muxing VP6 in flv will produce flipped video on playback.\n");
450 case AVMEDIA_TYPE_AUDIO:
451 if (flv->audio_par) {
452 av_log(s, AV_LOG_ERROR,
453 "at most one audio stream is supported in flv\n");
454 return AVERROR(EINVAL);
456 flv->audio_par = par;
457 if (get_audio_flags(s, par) < 0)
458 return unsupported_codec(s, "Audio", par->codec_id);
459 if (par->codec_id == AV_CODEC_ID_PCM_S16BE)
460 av_log(s, AV_LOG_WARNING,
461 "16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
463 case AVMEDIA_TYPE_DATA:
464 if (par->codec_id != AV_CODEC_ID_TEXT && par->codec_id != AV_CODEC_ID_NONE)
465 return unsupported_codec(s, "Data", par->codec_id);
468 case AVMEDIA_TYPE_SUBTITLE:
469 if (par->codec_id != AV_CODEC_ID_TEXT) {
470 av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n",
471 avcodec_get_name(par->codec_id), i);
472 return AVERROR_INVALIDDATA;
477 av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
478 av_get_media_type_string(par->codec_type), i);
479 return AVERROR(EINVAL);
481 avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
483 sc = av_mallocz(sizeof(FLVStreamContext));
485 return AVERROR(ENOMEM);
486 s->streams[i]->priv_data = sc;
490 flv->delay = AV_NOPTS_VALUE;
492 avio_write(pb, "FLV", 3);
494 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_par +
495 FLV_HEADER_FLAG_HASVIDEO * !!flv->video_par);
499 for (i = 0; i < s->nb_streams; i++)
500 if (s->streams[i]->codecpar->codec_tag == 5) {
501 avio_w8(pb, 8); // message type
502 avio_wb24(pb, 0); // include flags
503 avio_wb24(pb, 0); // time stamp
504 avio_wb32(pb, 0); // reserved
505 avio_wb32(pb, 11); // size
509 write_metadata(s, 0);
511 for (i = 0; i < s->nb_streams; i++) {
512 flv_write_codec_header(s, s->streams[i]->codecpar);
518 static int flv_write_trailer(AVFormatContext *s)
522 AVIOContext *pb = s->pb;
523 FLVContext *flv = s->priv_data;
527 for (i = 0; i < s->nb_streams; i++) {
528 AVCodecParameters *par = s->streams[i]->codecpar;
529 FLVStreamContext *sc = s->streams[i]->priv_data;
530 if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
531 (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
532 put_avc_eos_tag(pb, sc->last_ts);
535 file_size = avio_tell(pb);
537 /* update information */
538 if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
539 av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
541 put_amf_double(pb, flv->duration / (double)1000);
542 if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
543 av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
545 put_amf_double(pb, file_size);
547 avio_seek(pb, file_size, SEEK_SET);
551 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
553 AVIOContext *pb = s->pb;
554 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
555 FLVContext *flv = s->priv_data;
556 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
558 int size = pkt->size;
559 uint8_t *data = NULL;
560 int flags = -1, flags_size, ret;
562 if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
563 par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
565 else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)
570 if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
571 || par->codec_id == AV_CODEC_ID_MPEG4) {
573 uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
574 if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
575 av_free(par->extradata);
576 par->extradata = av_mallocz(side_size + AV_INPUT_BUFFER_PADDING_SIZE);
577 memcpy(par->extradata, side, side_size);
578 par->extradata_size = side_size;
579 flv_write_codec_header(s, par);
583 if (flv->delay == AV_NOPTS_VALUE)
584 flv->delay = -pkt->dts;
586 if (pkt->dts < -flv->delay) {
587 av_log(s, AV_LOG_WARNING,
588 "Packets are not in the proper order with respect to DTS\n");
589 return AVERROR(EINVAL);
594 if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
595 write_metadata(s, ts);
596 s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
599 avio_write_marker(pb, av_rescale(ts, AV_TIME_BASE, 1000),
600 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);
602 switch (par->codec_type) {
603 case AVMEDIA_TYPE_VIDEO:
604 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
606 flags = ff_codec_get_tag(flv_video_codec_ids, par->codec_id);
608 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
610 case AVMEDIA_TYPE_AUDIO:
611 flags = get_audio_flags(s, par);
615 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
617 case AVMEDIA_TYPE_SUBTITLE:
618 case AVMEDIA_TYPE_DATA:
619 avio_w8(pb, FLV_TAG_TYPE_META);
622 return AVERROR(EINVAL);
625 if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
626 /* check if extradata looks like mp4 formatted */
627 if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
628 if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
630 } else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
631 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
632 if (!s->streams[pkt->stream_index]->nb_frames) {
633 av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
634 "use the audio bitstream filter 'aac_adtstoasc' to fix it "
635 "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
636 return AVERROR_INVALIDDATA;
638 av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
641 /* check Speex packet duration */
642 if (par->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
643 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
644 "8 frames per packet. Adobe Flash "
645 "Player cannot handle this!\n");
647 if (sc->last_ts < ts)
650 if (size + flags_size >= 1<<24) {
651 av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
652 size + flags_size, 1<<24);
653 return AVERROR(EINVAL);
656 avio_wb24(pb, size + flags_size);
657 avio_wb24(pb, ts & 0xFFFFFF);
658 avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
659 avio_wb24(pb, flv->reserved);
661 if (par->codec_type == AVMEDIA_TYPE_DATA ||
662 par->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
664 int64_t metadata_size_pos = avio_tell(pb);
665 if (par->codec_id == AV_CODEC_ID_TEXT) {
666 // legacy FFmpeg magic?
667 avio_w8(pb, AMF_DATA_TYPE_STRING);
668 put_amf_string(pb, "onTextData");
669 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
671 put_amf_string(pb, "type");
672 avio_w8(pb, AMF_DATA_TYPE_STRING);
673 put_amf_string(pb, "Text");
674 put_amf_string(pb, "text");
675 avio_w8(pb, AMF_DATA_TYPE_STRING);
676 put_amf_string(pb, pkt->data);
677 put_amf_string(pb, "");
678 avio_w8(pb, AMF_END_OF_OBJECT);
680 // just pass the metadata through
681 avio_write(pb, data ? data : pkt->data, size);
683 /* write total size of tag */
684 data_size = avio_tell(pb) - metadata_size_pos;
685 avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
686 avio_wb24(pb, data_size);
687 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
688 avio_wb32(pb, data_size + 11);
690 av_assert1(flags>=0);
692 if (par->codec_id == AV_CODEC_ID_VP6)
694 if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A) {
695 if (par->extradata_size)
696 avio_w8(pb, par->extradata[0]);
698 avio_w8(pb, ((FFALIGN(par->width, 16) - par->width) << 4) |
699 (FFALIGN(par->height, 16) - par->height));
700 } else if (par->codec_id == AV_CODEC_ID_AAC)
701 avio_w8(pb, 1); // AAC raw
702 else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
703 avio_w8(pb, 1); // AVC NALU
704 avio_wb24(pb, pkt->pts - pkt->dts);
707 avio_write(pb, data ? data : pkt->data, size);
709 avio_wb32(pb, size + flags_size + 11); // previous tag size
710 flv->duration = FFMAX(flv->duration,
711 pkt->pts + flv->delay + pkt->duration);
719 static const AVOption options[] = {
720 { "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
721 { "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
725 static const AVClass flv_muxer_class = {
726 .class_name = "flv muxer",
727 .item_name = av_default_item_name,
729 .version = LIBAVUTIL_VERSION_INT,
732 AVOutputFormat ff_flv_muxer = {
734 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
735 .mime_type = "video/x-flv",
737 .priv_data_size = sizeof(FLVContext),
738 .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
739 .video_codec = AV_CODEC_ID_FLV1,
740 .write_header = flv_write_header,
741 .write_packet = flv_write_packet,
742 .write_trailer = flv_write_trailer,
743 .codec_tag = (const AVCodecTag* const []) {
744 flv_video_codec_ids, flv_audio_codec_ids, 0
746 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
748 .priv_class = &flv_muxer_class,