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/intfloat_readwrite.h"
29 #include "libavutil/dict.h"
34 static const AVCodecTag flv_video_codec_ids[] = {
35 {CODEC_ID_FLV1, FLV_CODECID_H263 },
36 {CODEC_ID_H263, FLV_CODECID_REALH263},
37 {CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
38 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
39 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
40 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
41 {CODEC_ID_VP6, FLV_CODECID_VP6 },
42 {CODEC_ID_H264, FLV_CODECID_H264 },
46 static const AVCodecTag flv_audio_codec_ids[] = {
47 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
48 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
49 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
50 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
51 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
52 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
53 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
54 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
58 typedef struct FLVContext {
60 int64_t duration_offset;
61 int64_t filesize_offset;
63 int64_t delay; ///< first dts delay (needed for AVC & Speex)
66 typedef struct FLVStreamContext {
67 int64_t last_ts; ///< last timestamp for each stream
70 static int get_audio_flags(AVCodecContext *enc){
71 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
73 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
74 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
75 else if (enc->codec_id == CODEC_ID_SPEEX) {
76 if (enc->sample_rate != 16000) {
77 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
80 if (enc->channels != 1) {
81 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
84 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
86 switch (enc->sample_rate) {
88 flags |= FLV_SAMPLERATE_44100HZ;
91 flags |= FLV_SAMPLERATE_22050HZ;
94 flags |= FLV_SAMPLERATE_11025HZ;
96 case 8000: //nellymoser only
98 if(enc->codec_id != CODEC_ID_MP3){
99 flags |= FLV_SAMPLERATE_SPECIAL;
103 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
108 if (enc->channels > 1) {
112 switch(enc->codec_id){
114 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
116 case CODEC_ID_PCM_U8:
117 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
119 case CODEC_ID_PCM_S16BE:
120 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
122 case CODEC_ID_PCM_S16LE:
123 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
125 case CODEC_ID_ADPCM_SWF:
126 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
128 case CODEC_ID_NELLYMOSER:
129 if (enc->sample_rate == 8000) {
130 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
132 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
136 flags |= enc->codec_tag<<4;
139 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
146 static void put_amf_string(AVIOContext *pb, const char *str)
148 size_t len = strlen(str);
150 avio_write(pb, str, len);
153 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
154 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
155 avio_wb24(pb, 5); /* Tag Data Size */
156 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
157 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
158 avio_wb24(pb, 0); /* StreamId = 0 */
159 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
160 avio_w8(pb, 2); /* AVC end of sequence */
161 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
162 avio_wb32(pb, 16); /* Size of FLV tag */
165 static void put_amf_double(AVIOContext *pb, double d)
167 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
168 avio_wb64(pb, av_dbl2int(d));
171 static void put_amf_bool(AVIOContext *pb, int b) {
172 avio_w8(pb, AMF_DATA_TYPE_BOOL);
176 static int flv_write_header(AVFormatContext *s)
178 AVIOContext *pb = s->pb;
179 FLVContext *flv = s->priv_data;
180 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
181 int i, metadata_count = 0;
182 double framerate = 0.0;
183 int64_t metadata_size_pos, data_size, metadata_count_pos;
184 AVDictionaryEntry *tag = NULL;
186 for(i=0; i<s->nb_streams; i++){
187 AVCodecContext *enc = s->streams[i]->codec;
188 FLVStreamContext *sc;
189 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
190 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
191 framerate = av_q2d(s->streams[i]->r_frame_rate);
193 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
196 if(enc->codec_tag == 0) {
197 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
200 } else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
202 if(get_audio_flags(enc)<0)
205 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
207 sc = av_mallocz(sizeof(FLVStreamContext));
209 return AVERROR(ENOMEM);
210 s->streams[i]->priv_data = sc;
213 flv->delay = AV_NOPTS_VALUE;
215 avio_write(pb, "FLV", 3);
217 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
218 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
222 for(i=0; i<s->nb_streams; i++){
223 if(s->streams[i]->codec->codec_tag == 5){
224 avio_w8(pb,8); // message type
225 avio_wb24(pb,0); // include flags
226 avio_wb24(pb,0); // time stamp
227 avio_wb32(pb,0); // reserved
228 avio_wb32(pb,11); // size
234 avio_w8(pb, 18); // tag type META
235 metadata_size_pos= avio_tell(pb);
236 avio_wb24(pb, 0); // size of data part (sum of all parts below)
237 avio_wb24(pb, 0); // time stamp
238 avio_wb32(pb, 0); // reserved
240 /* now data of data_size size */
242 /* first event name as a string */
243 avio_w8(pb, AMF_DATA_TYPE_STRING);
244 put_amf_string(pb, "onMetaData"); // 12 bytes
246 /* mixed array (hash) with size and string/type/data tuples */
247 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
248 metadata_count_pos = avio_tell(pb);
249 metadata_count = 5*!!video_enc + 5*!!audio_enc + 2; // +2 for duration and file size
250 avio_wb32(pb, metadata_count);
252 put_amf_string(pb, "duration");
253 flv->duration_offset= avio_tell(pb);
254 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
257 put_amf_string(pb, "width");
258 put_amf_double(pb, video_enc->width);
260 put_amf_string(pb, "height");
261 put_amf_double(pb, video_enc->height);
263 put_amf_string(pb, "videodatarate");
264 put_amf_double(pb, video_enc->bit_rate / 1024.0);
266 put_amf_string(pb, "framerate");
267 put_amf_double(pb, framerate);
269 put_amf_string(pb, "videocodecid");
270 put_amf_double(pb, video_enc->codec_tag);
274 put_amf_string(pb, "audiodatarate");
275 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
277 put_amf_string(pb, "audiosamplerate");
278 put_amf_double(pb, audio_enc->sample_rate);
280 put_amf_string(pb, "audiosamplesize");
281 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
283 put_amf_string(pb, "stereo");
284 put_amf_bool(pb, audio_enc->channels == 2);
286 put_amf_string(pb, "audiocodecid");
287 put_amf_double(pb, audio_enc->codec_tag);
290 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
291 if( !strcmp(tag->key, "width")
292 ||!strcmp(tag->key, "height")
293 ||!strcmp(tag->key, "videodatarate")
294 ||!strcmp(tag->key, "framerate")
295 ||!strcmp(tag->key, "videocodecid")
296 ||!strcmp(tag->key, "audiodatarate")
297 ||!strcmp(tag->key, "audiosamplerate")
298 ||!strcmp(tag->key, "audiosamplesize")
299 ||!strcmp(tag->key, "stereo")
300 ||!strcmp(tag->key, "audiocodecid")
301 ||!strcmp(tag->key, "duration")
302 ||!strcmp(tag->key, "onMetaData")
304 av_log(s, AV_LOG_DEBUG, "ignoring metadata for %s\n", tag->key);
307 put_amf_string(pb, tag->key);
308 avio_w8(pb, AMF_DATA_TYPE_STRING);
309 put_amf_string(pb, tag->value);
313 put_amf_string(pb, "filesize");
314 flv->filesize_offset= avio_tell(pb);
315 put_amf_double(pb, 0); // delayed write
317 put_amf_string(pb, "");
318 avio_w8(pb, AMF_END_OF_OBJECT);
320 /* write total size of tag */
321 data_size= avio_tell(pb) - metadata_size_pos - 10;
323 avio_seek(pb, metadata_count_pos, SEEK_SET);
324 avio_wb32(pb, metadata_count);
326 avio_seek(pb, metadata_size_pos, SEEK_SET);
327 avio_wb24(pb, data_size);
328 avio_skip(pb, data_size + 10 - 3);
329 avio_wb32(pb, data_size + 11);
331 for (i = 0; i < s->nb_streams; i++) {
332 AVCodecContext *enc = s->streams[i]->codec;
333 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
335 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
336 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
337 avio_wb24(pb, 0); // size patched later
338 avio_wb24(pb, 0); // ts
339 avio_w8(pb, 0); // ts ext
340 avio_wb24(pb, 0); // streamid
342 if (enc->codec_id == CODEC_ID_AAC) {
343 avio_w8(pb, get_audio_flags(enc));
344 avio_w8(pb, 0); // AAC sequence header
345 avio_write(pb, enc->extradata, enc->extradata_size);
347 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
348 avio_w8(pb, 0); // AVC sequence header
349 avio_wb24(pb, 0); // composition time
350 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
352 data_size = avio_tell(pb) - pos;
353 avio_seek(pb, -data_size - 10, SEEK_CUR);
354 avio_wb24(pb, data_size);
355 avio_skip(pb, data_size + 10 - 3);
356 avio_wb32(pb, data_size + 11); // previous tag size
363 static int flv_write_trailer(AVFormatContext *s)
367 AVIOContext *pb = s->pb;
368 FLVContext *flv = s->priv_data;
372 for (i = 0; i < s->nb_streams; i++) {
373 AVCodecContext *enc = s->streams[i]->codec;
374 FLVStreamContext *sc = s->streams[i]->priv_data;
375 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
376 (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)) {
377 put_avc_eos_tag(pb, sc->last_ts);
381 file_size = avio_tell(pb);
383 /* update informations */
384 avio_seek(pb, flv->duration_offset, SEEK_SET);
385 put_amf_double(pb, flv->duration / (double)1000);
386 avio_seek(pb, flv->filesize_offset, SEEK_SET);
387 put_amf_double(pb, file_size);
389 avio_seek(pb, file_size, SEEK_SET);
393 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
395 AVIOContext *pb = s->pb;
396 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
397 FLVContext *flv = s->priv_data;
398 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
402 int flags, flags_size;
404 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
406 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
407 enc->codec_id == CODEC_ID_AAC)
409 else if(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)
414 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
415 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
417 flags = enc->codec_tag;
419 av_log(enc, AV_LOG_ERROR, "video codec %s not compatible with flv\n", avcodec_get_name(enc->codec_id));
423 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
424 } else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
425 flags = get_audio_flags(enc);
429 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
431 // In-band flv metadata ("scriptdata")
432 assert(enc->codec_type == AVMEDIA_TYPE_DATA);
433 avio_w8(pb, FLV_TAG_TYPE_META);
438 if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
439 /* check if extradata looks like mp4 formated */
440 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
441 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
444 } else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
445 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
446 av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
449 if (flv->delay == AV_NOPTS_VALUE)
450 flv->delay = -pkt->dts;
451 if (pkt->dts < -flv->delay) {
452 av_log(s, AV_LOG_WARNING, "Packets are not in the proper order with "
454 return AVERROR(EINVAL);
457 ts = pkt->dts + flv->delay; // add delay to force positive dts
459 /* check Speex packet duration */
460 if (enc->codec_id == CODEC_ID_SPEEX && ts - sc->last_ts > 160) {
461 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
462 "8 frames per packet. Adobe Flash "
463 "Player cannot handle this!\n");
466 if (sc->last_ts < ts)
469 avio_wb24(pb,size + flags_size);
471 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
472 avio_wb24(pb,flv->reserved);
477 if (enc->codec_id == CODEC_ID_VP6)
479 if (enc->codec_id == CODEC_ID_VP6F)
480 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
481 else if (enc->codec_id == CODEC_ID_AAC)
482 avio_w8(pb,1); // AAC raw
483 else if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
484 avio_w8(pb,1); // AVC NALU
485 avio_wb24(pb,pkt->pts - pkt->dts);
488 avio_write(pb, data ? data : pkt->data, size);
490 avio_wb32(pb,size+flags_size+11); // previous tag size
491 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
500 AVOutputFormat ff_flv_muxer = {
502 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
503 .mime_type = "video/x-flv",
505 .priv_data_size = sizeof(FLVContext),
506 #if CONFIG_LIBMP3LAME
507 .audio_codec = CODEC_ID_MP3,
508 #else // CONFIG_LIBMP3LAME
509 .audio_codec = CODEC_ID_ADPCM_SWF,
510 #endif // CONFIG_LIBMP3LAME
511 .video_codec = CODEC_ID_FLV1,
512 .write_header = flv_write_header,
513 .write_packet = flv_write_packet,
514 .write_trailer = flv_write_trailer,
515 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
516 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,