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"
33 static const AVCodecTag flv_video_codec_ids[] = {
34 { AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
35 { AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
36 { AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
37 { AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
38 { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
39 { AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
40 { AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
41 { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
42 { AV_CODEC_ID_H264, FLV_CODECID_H264 },
43 { AV_CODEC_ID_NONE, 0 }
46 static const AVCodecTag flv_audio_codec_ids[] = {
47 { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
48 { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
49 { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
50 { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
51 { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
52 { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
53 { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
54 { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
55 { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
56 { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
57 { AV_CODEC_ID_NONE, 0 }
60 typedef struct FLVContext {
62 int64_t duration_offset;
63 int64_t filesize_offset;
65 int64_t delay; ///< first dts delay (needed for AVC & Speex)
67 AVCodecContext *audio_enc;
68 AVCodecContext *video_enc;
70 AVCodecContext *data_enc;
73 typedef struct FLVStreamContext {
74 int64_t last_ts; ///< last timestamp for each stream
77 static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
79 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
80 : FLV_SAMPLESSIZE_8BIT;
82 if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
83 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
84 FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
85 else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
86 if (enc->sample_rate != 16000) {
87 av_log(s, AV_LOG_ERROR,
88 "FLV only supports wideband (16kHz) Speex audio\n");
89 return AVERROR(EINVAL);
91 if (enc->channels != 1) {
92 av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
93 return AVERROR(EINVAL);
95 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
97 switch (enc->sample_rate) {
99 flags |= FLV_SAMPLERATE_44100HZ;
102 flags |= FLV_SAMPLERATE_22050HZ;
105 flags |= FLV_SAMPLERATE_11025HZ;
107 case 16000: // nellymoser only
108 case 8000: // nellymoser only
109 case 5512: // not MP3
110 if (enc->codec_id != AV_CODEC_ID_MP3) {
111 flags |= FLV_SAMPLERATE_SPECIAL;
115 av_log(s, AV_LOG_ERROR,
116 "FLV does not support sample rate %d, "
117 "choose from (44100, 22050, 11025)\n", enc->sample_rate);
118 return AVERROR(EINVAL);
122 if (enc->channels > 1)
125 switch (enc->codec_id) {
126 case AV_CODEC_ID_MP3:
127 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
129 case AV_CODEC_ID_PCM_U8:
130 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
132 case AV_CODEC_ID_PCM_S16BE:
133 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
135 case AV_CODEC_ID_PCM_S16LE:
136 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
138 case AV_CODEC_ID_ADPCM_SWF:
139 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
141 case AV_CODEC_ID_NELLYMOSER:
142 if (enc->sample_rate == 8000)
143 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
144 else if (enc->sample_rate == 16000)
145 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
147 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
149 case AV_CODEC_ID_PCM_MULAW:
150 flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
152 case AV_CODEC_ID_PCM_ALAW:
153 flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
156 flags |= enc->codec_tag << 4;
159 av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
160 avcodec_get_name(enc->codec_id));
161 return AVERROR(EINVAL);
167 static void put_amf_string(AVIOContext *pb, const char *str)
169 size_t len = strlen(str);
171 avio_write(pb, str, len);
174 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
176 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
177 avio_wb24(pb, 5); /* Tag Data Size */
178 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
179 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
180 avio_wb24(pb, 0); /* StreamId = 0 */
181 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
182 avio_w8(pb, 2); /* AVC end of sequence */
183 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
184 avio_wb32(pb, 16); /* Size of FLV tag */
187 static void put_amf_double(AVIOContext *pb, double d)
189 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
190 avio_wb64(pb, av_double2int(d));
193 static void put_amf_bool(AVIOContext *pb, int b)
195 avio_w8(pb, AMF_DATA_TYPE_BOOL);
199 static void write_metadata(AVFormatContext *s, unsigned int ts)
201 AVIOContext *pb = s->pb;
202 FLVContext *flv = s->priv_data;
203 int metadata_count = 0;
204 int64_t metadata_size_pos, data_size, metadata_count_pos;
205 AVDictionaryEntry *tag = NULL;
208 avio_w8(pb, 18); // tag type META
209 metadata_size_pos = avio_tell(pb);
210 avio_wb24(pb, 0); // size of data part (sum of all parts below)
211 avio_wb24(pb, ts); // timestamp
212 avio_wb32(pb, 0); // reserved
214 /* now data of data_size size */
216 /* first event name as a string */
217 avio_w8(pb, AMF_DATA_TYPE_STRING);
218 put_amf_string(pb, "onMetaData"); // 12 bytes
220 /* mixed array (hash) with size and string/type/data tuples */
221 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
222 metadata_count_pos = avio_tell(pb);
223 metadata_count = 4 * !!flv->video_enc +
224 5 * !!flv->audio_enc +
225 1 * !!flv->data_enc +
226 2; // +2 for duration and file size
228 avio_wb32(pb, metadata_count);
230 put_amf_string(pb, "duration");
231 flv->duration_offset = avio_tell(pb);
233 // fill in the guessed duration, it'll be corrected later if incorrect
234 put_amf_double(pb, s->duration / AV_TIME_BASE);
236 if (flv->video_enc) {
237 put_amf_string(pb, "width");
238 put_amf_double(pb, flv->video_enc->width);
240 put_amf_string(pb, "height");
241 put_amf_double(pb, flv->video_enc->height);
243 put_amf_string(pb, "videodatarate");
244 put_amf_double(pb, flv->video_enc->bit_rate / 1024.0);
246 if (flv->framerate != 0.0) {
247 put_amf_string(pb, "framerate");
248 put_amf_double(pb, flv->framerate);
252 put_amf_string(pb, "videocodecid");
253 put_amf_double(pb, flv->video_enc->codec_tag);
256 if (flv->audio_enc) {
257 put_amf_string(pb, "audiodatarate");
258 put_amf_double(pb, flv->audio_enc->bit_rate / 1024.0);
260 put_amf_string(pb, "audiosamplerate");
261 put_amf_double(pb, flv->audio_enc->sample_rate);
263 put_amf_string(pb, "audiosamplesize");
264 put_amf_double(pb, flv->audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
266 put_amf_string(pb, "stereo");
267 put_amf_bool(pb, flv->audio_enc->channels == 2);
269 put_amf_string(pb, "audiocodecid");
270 put_amf_double(pb, flv->audio_enc->codec_tag);
274 put_amf_string(pb, "datastream");
275 put_amf_double(pb, 0.0);
278 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
279 if( !strcmp(tag->key, "width")
280 ||!strcmp(tag->key, "height")
281 ||!strcmp(tag->key, "videodatarate")
282 ||!strcmp(tag->key, "framerate")
283 ||!strcmp(tag->key, "videocodecid")
284 ||!strcmp(tag->key, "audiodatarate")
285 ||!strcmp(tag->key, "audiosamplerate")
286 ||!strcmp(tag->key, "audiosamplesize")
287 ||!strcmp(tag->key, "stereo")
288 ||!strcmp(tag->key, "audiocodecid")
289 ||!strcmp(tag->key, "duration")
290 ||!strcmp(tag->key, "onMetaData")
291 ||!strcmp(tag->key, "datasize")
292 ||!strcmp(tag->key, "lasttimestamp")
293 ||!strcmp(tag->key, "totalframes")
294 ||!strcmp(tag->key, "hasAudio")
295 ||!strcmp(tag->key, "hasVideo")
296 ||!strcmp(tag->key, "hasCuePoints")
297 ||!strcmp(tag->key, "hasMetadata")
298 ||!strcmp(tag->key, "hasKeyframes")
300 av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
303 put_amf_string(pb, tag->key);
304 avio_w8(pb, AMF_DATA_TYPE_STRING);
305 put_amf_string(pb, tag->value);
309 put_amf_string(pb, "filesize");
310 flv->filesize_offset = avio_tell(pb);
311 put_amf_double(pb, 0); // delayed write
313 put_amf_string(pb, "");
314 avio_w8(pb, AMF_END_OF_OBJECT);
316 /* write total size of tag */
317 data_size = avio_tell(pb) - metadata_size_pos - 10;
319 avio_seek(pb, metadata_count_pos, SEEK_SET);
320 avio_wb32(pb, metadata_count);
322 avio_seek(pb, metadata_size_pos, SEEK_SET);
323 avio_wb24(pb, data_size);
324 avio_skip(pb, data_size + 10 - 3);
325 avio_wb32(pb, data_size + 11);
328 static int unsupported_codec(AVFormatContext *s,
329 const char* type, int codec_id)
331 const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
332 av_log(s, AV_LOG_ERROR,
333 "%s codec %s not compatible with flv\n",
335 desc ? desc->name : "unknown");
336 return AVERROR(ENOSYS);
339 static int flv_write_header(AVFormatContext *s)
342 AVIOContext *pb = s->pb;
343 FLVContext *flv = s->priv_data;
346 for (i = 0; i < s->nb_streams; i++) {
347 AVCodecContext *enc = s->streams[i]->codec;
348 FLVStreamContext *sc;
349 switch (enc->codec_type) {
350 case AVMEDIA_TYPE_VIDEO:
351 if (s->streams[i]->avg_frame_rate.den &&
352 s->streams[i]->avg_frame_rate.num) {
353 flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
355 if (flv->video_enc) {
356 av_log(s, AV_LOG_ERROR,
357 "at most one video stream is supported in flv\n");
358 return AVERROR(EINVAL);
360 flv->video_enc = enc;
361 if (!ff_codec_get_tag(flv_video_codec_ids, enc->codec_id))
362 return unsupported_codec(s, "Video", enc->codec_id);
364 if (enc->codec_id == AV_CODEC_ID_MPEG4 ||
365 enc->codec_id == AV_CODEC_ID_H263) {
366 int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
367 av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
368 "Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(enc->codec_id));
371 av_log(s, AV_LOG_ERROR,
372 "use vstrict=-1 / -strict -1 to use it anyway.\n");
373 return AVERROR(EINVAL);
375 } else if (enc->codec_id == AV_CODEC_ID_VP6) {
376 av_log(s, AV_LOG_WARNING,
377 "Muxing VP6 in flv will produce flipped video on playback.\n");
380 case AVMEDIA_TYPE_AUDIO:
381 if (flv->audio_enc) {
382 av_log(s, AV_LOG_ERROR,
383 "at most one audio stream is supported in flv\n");
384 return AVERROR(EINVAL);
386 flv->audio_enc = enc;
387 if (get_audio_flags(s, enc) < 0)
388 return unsupported_codec(s, "Audio", enc->codec_id);
389 if (enc->codec_id == AV_CODEC_ID_PCM_S16BE)
390 av_log(s, AV_LOG_WARNING,
391 "16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
393 case AVMEDIA_TYPE_DATA:
394 if (enc->codec_id != AV_CODEC_ID_TEXT && enc->codec_id != AV_CODEC_ID_NONE)
395 return unsupported_codec(s, "Data", enc->codec_id);
398 case AVMEDIA_TYPE_SUBTITLE:
399 if (enc->codec_id != AV_CODEC_ID_TEXT) {
400 av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n",
401 avcodec_get_name(enc->codec_id), i);
402 return AVERROR_INVALIDDATA;
407 av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
408 av_get_media_type_string(enc->codec_type), i);
409 return AVERROR(EINVAL);
411 avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
413 sc = av_mallocz(sizeof(FLVStreamContext));
415 return AVERROR(ENOMEM);
416 s->streams[i]->priv_data = sc;
420 flv->delay = AV_NOPTS_VALUE;
422 avio_write(pb, "FLV", 3);
424 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_enc +
425 FLV_HEADER_FLAG_HASVIDEO * !!flv->video_enc);
429 for (i = 0; i < s->nb_streams; i++)
430 if (s->streams[i]->codec->codec_tag == 5) {
431 avio_w8(pb, 8); // message type
432 avio_wb24(pb, 0); // include flags
433 avio_wb24(pb, 0); // time stamp
434 avio_wb32(pb, 0); // reserved
435 avio_wb32(pb, 11); // size
439 write_metadata(s, 0);
441 for (i = 0; i < s->nb_streams; i++) {
442 AVCodecContext *enc = s->streams[i]->codec;
443 if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
445 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
446 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
447 avio_wb24(pb, 0); // size patched later
448 avio_wb24(pb, 0); // ts
449 avio_w8(pb, 0); // ts ext
450 avio_wb24(pb, 0); // streamid
452 if (enc->codec_id == AV_CODEC_ID_AAC) {
453 avio_w8(pb, get_audio_flags(s, enc));
454 avio_w8(pb, 0); // AAC sequence header
455 avio_write(pb, enc->extradata, enc->extradata_size);
457 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
458 avio_w8(pb, 0); // AVC sequence header
459 avio_wb24(pb, 0); // composition time
460 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
462 data_size = avio_tell(pb) - pos;
463 avio_seek(pb, -data_size - 10, SEEK_CUR);
464 avio_wb24(pb, data_size);
465 avio_skip(pb, data_size + 10 - 3);
466 avio_wb32(pb, data_size + 11); // previous tag size
473 static int flv_write_trailer(AVFormatContext *s)
477 AVIOContext *pb = s->pb;
478 FLVContext *flv = s->priv_data;
482 for (i = 0; i < s->nb_streams; i++) {
483 AVCodecContext *enc = s->streams[i]->codec;
484 FLVStreamContext *sc = s->streams[i]->priv_data;
485 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
486 (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))
487 put_avc_eos_tag(pb, sc->last_ts);
490 file_size = avio_tell(pb);
492 /* update information */
493 if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
494 av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
496 put_amf_double(pb, flv->duration / (double)1000);
497 if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
498 av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
500 put_amf_double(pb, file_size);
502 avio_seek(pb, file_size, SEEK_SET);
506 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
508 AVIOContext *pb = s->pb;
509 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
510 FLVContext *flv = s->priv_data;
511 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
513 int size = pkt->size;
514 uint8_t *data = NULL;
515 int flags = -1, flags_size, ret;
517 if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
518 enc->codec_id == AV_CODEC_ID_VP6 || enc->codec_id == AV_CODEC_ID_AAC)
520 else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4)
525 if (flv->delay == AV_NOPTS_VALUE)
526 flv->delay = -pkt->dts;
528 if (pkt->dts < -flv->delay) {
529 av_log(s, AV_LOG_WARNING,
530 "Packets are not in the proper order with respect to DTS\n");
531 return AVERROR(EINVAL);
534 ts = pkt->dts + flv->delay; // add delay to force positive dts
536 if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
537 write_metadata(s, ts);
538 s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
541 switch (enc->codec_type) {
542 case AVMEDIA_TYPE_VIDEO:
543 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
545 flags = ff_codec_get_tag(flv_video_codec_ids, enc->codec_id);
547 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
549 case AVMEDIA_TYPE_AUDIO:
550 flags = get_audio_flags(s, enc);
554 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
556 case AVMEDIA_TYPE_SUBTITLE:
557 case AVMEDIA_TYPE_DATA:
558 avio_w8(pb, FLV_TAG_TYPE_META);
561 return AVERROR(EINVAL);
564 if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
565 /* check if extradata looks like mp4 formatted */
566 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
567 if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
569 } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
570 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
571 if (!s->streams[pkt->stream_index]->nb_frames) {
572 av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
573 "use the audio bitstream filter 'aac_adtstoasc' to fix it "
574 "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
575 return AVERROR_INVALIDDATA;
577 av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
580 /* check Speex packet duration */
581 if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
582 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
583 "8 frames per packet. Adobe Flash "
584 "Player cannot handle this!\n");
586 if (sc->last_ts < ts)
589 if (size + flags_size >= 1<<24) {
590 av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
591 size + flags_size, 1<<24);
592 return AVERROR(EINVAL);
595 avio_wb24(pb, size + flags_size);
596 avio_wb24(pb, ts & 0xFFFFFF);
597 avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
598 avio_wb24(pb, flv->reserved);
600 if (enc->codec_type == AVMEDIA_TYPE_DATA ||
601 enc->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
603 int64_t metadata_size_pos = avio_tell(pb);
604 if (enc->codec_id == AV_CODEC_ID_TEXT) {
605 // legacy FFmpeg magic?
606 avio_w8(pb, AMF_DATA_TYPE_STRING);
607 put_amf_string(pb, "onTextData");
608 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
610 put_amf_string(pb, "type");
611 avio_w8(pb, AMF_DATA_TYPE_STRING);
612 put_amf_string(pb, "Text");
613 put_amf_string(pb, "text");
614 avio_w8(pb, AMF_DATA_TYPE_STRING);
615 put_amf_string(pb, pkt->data);
616 put_amf_string(pb, "");
617 avio_w8(pb, AMF_END_OF_OBJECT);
619 // just pass the metadata through
620 avio_write(pb, data ? data : pkt->data, size);
622 /* write total size of tag */
623 data_size = avio_tell(pb) - metadata_size_pos;
624 avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
625 avio_wb24(pb, data_size);
626 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
627 avio_wb32(pb, data_size + 11);
629 av_assert1(flags>=0);
631 if (enc->codec_id == AV_CODEC_ID_VP6)
633 if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A) {
634 if (enc->extradata_size)
635 avio_w8(pb, enc->extradata[0]);
637 avio_w8(pb, ((FFALIGN(enc->width, 16) - enc->width) << 4) |
638 (FFALIGN(enc->height, 16) - enc->height));
639 } else if (enc->codec_id == AV_CODEC_ID_AAC)
640 avio_w8(pb, 1); // AAC raw
641 else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
642 avio_w8(pb, 1); // AVC NALU
643 avio_wb24(pb, pkt->pts - pkt->dts);
646 avio_write(pb, data ? data : pkt->data, size);
648 avio_wb32(pb, size + flags_size + 11); // previous tag size
649 flv->duration = FFMAX(flv->duration,
650 pkt->pts + flv->delay + pkt->duration);
658 AVOutputFormat ff_flv_muxer = {
660 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
661 .mime_type = "video/x-flv",
663 .priv_data_size = sizeof(FLVContext),
664 .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
665 .video_codec = AV_CODEC_ID_FLV1,
666 .write_header = flv_write_header,
667 .write_packet = flv_write_packet,
668 .write_trailer = flv_write_trailer,
669 .codec_tag = (const AVCodecTag* const []) {
670 flv_video_codec_ids, flv_audio_codec_ids, 0
672 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |