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"
32 static const AVCodecTag flv_video_codec_ids[] = {
33 {CODEC_ID_FLV1, FLV_CODECID_H263 },
34 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
35 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
36 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
37 {CODEC_ID_VP6, FLV_CODECID_VP6 },
38 {CODEC_ID_H264, FLV_CODECID_H264 },
42 static const AVCodecTag flv_audio_codec_ids[] = {
43 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
44 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
45 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
46 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
47 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
48 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
49 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
50 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
54 typedef struct FLVContext {
56 int64_t duration_offset;
57 int64_t filesize_offset;
59 int delay; ///< first dts delay for AVC
60 int64_t last_video_ts;
63 static int get_audio_flags(AVCodecContext *enc){
64 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
66 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
67 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
68 else if (enc->codec_id == CODEC_ID_SPEEX) {
69 if (enc->sample_rate != 16000) {
70 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
73 if (enc->channels != 1) {
74 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
77 if (enc->frame_size / 320 > 8) {
78 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
79 "8 frames per packet. Adobe Flash "
80 "Player cannot handle this!\n");
82 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
84 switch (enc->sample_rate) {
86 flags |= FLV_SAMPLERATE_44100HZ;
89 flags |= FLV_SAMPLERATE_22050HZ;
92 flags |= FLV_SAMPLERATE_11025HZ;
94 case 8000: //nellymoser only
96 if(enc->codec_id != CODEC_ID_MP3){
97 flags |= FLV_SAMPLERATE_SPECIAL;
101 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
106 if (enc->channels > 1) {
110 switch(enc->codec_id){
112 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
114 case CODEC_ID_PCM_U8:
115 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
117 case CODEC_ID_PCM_S16BE:
118 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
120 case CODEC_ID_PCM_S16LE:
121 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
123 case CODEC_ID_ADPCM_SWF:
124 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
126 case CODEC_ID_NELLYMOSER:
127 if (enc->sample_rate == 8000) {
128 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
130 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
134 flags |= enc->codec_tag<<4;
137 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
144 static void put_amf_string(AVIOContext *pb, const char *str)
146 size_t len = strlen(str);
148 avio_write(pb, str, len);
151 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
152 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
153 avio_wb24(pb, 5); /* Tag Data Size */
154 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
155 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
156 avio_wb24(pb, 0); /* StreamId = 0 */
157 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
158 avio_w8(pb, 2); /* AVC end of sequence */
159 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
160 avio_wb32(pb, 16); /* Size of FLV tag */
163 static void put_amf_double(AVIOContext *pb, double d)
165 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
166 avio_wb64(pb, av_dbl2int(d));
169 static void put_amf_bool(AVIOContext *pb, int b) {
170 avio_w8(pb, AMF_DATA_TYPE_BOOL);
174 static int flv_write_header(AVFormatContext *s)
176 AVIOContext *pb = s->pb;
177 FLVContext *flv = s->priv_data;
178 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
180 double framerate = 0.0;
181 int metadata_size_pos, data_size;
182 AVMetadataTag *tag = NULL;
184 for(i=0; i<s->nb_streams; i++){
185 AVCodecContext *enc = s->streams[i]->codec;
186 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
187 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
188 framerate = av_q2d(s->streams[i]->r_frame_rate);
190 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
193 if(enc->codec_tag == 0) {
194 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
199 if(get_audio_flags(enc)<0)
202 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
204 avio_write(pb, "FLV", 3);
206 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
207 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
211 for(i=0; i<s->nb_streams; i++){
212 if(s->streams[i]->codec->codec_tag == 5){
213 avio_w8(pb,8); // message type
214 avio_wb24(pb,0); // include flags
215 avio_wb24(pb,0); // time stamp
216 avio_wb32(pb,0); // reserved
217 avio_wb32(pb,11); // size
222 flv->last_video_ts = -1;
225 avio_w8(pb, 18); // tag type META
226 metadata_size_pos= avio_tell(pb);
227 avio_wb24(pb, 0); // size of data part (sum of all parts below)
228 avio_wb24(pb, 0); // time stamp
229 avio_wb32(pb, 0); // reserved
231 /* now data of data_size size */
233 /* first event name as a string */
234 avio_w8(pb, AMF_DATA_TYPE_STRING);
235 put_amf_string(pb, "onMetaData"); // 12 bytes
237 /* mixed array (hash) with size and string/type/data tuples */
238 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
239 avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
241 put_amf_string(pb, "duration");
242 flv->duration_offset= avio_tell(pb);
243 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
246 put_amf_string(pb, "width");
247 put_amf_double(pb, video_enc->width);
249 put_amf_string(pb, "height");
250 put_amf_double(pb, video_enc->height);
252 put_amf_string(pb, "videodatarate");
253 put_amf_double(pb, video_enc->bit_rate / 1024.0);
255 put_amf_string(pb, "framerate");
256 put_amf_double(pb, framerate);
258 put_amf_string(pb, "videocodecid");
259 put_amf_double(pb, video_enc->codec_tag);
263 put_amf_string(pb, "audiodatarate");
264 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
266 put_amf_string(pb, "audiosamplerate");
267 put_amf_double(pb, audio_enc->sample_rate);
269 put_amf_string(pb, "audiosamplesize");
270 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
272 put_amf_string(pb, "stereo");
273 put_amf_bool(pb, audio_enc->channels == 2);
275 put_amf_string(pb, "audiocodecid");
276 put_amf_double(pb, audio_enc->codec_tag);
279 while ((tag = av_metadata_get(s->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX))) {
280 put_amf_string(pb, tag->key);
281 avio_w8(pb, AMF_DATA_TYPE_STRING);
282 put_amf_string(pb, tag->value);
285 put_amf_string(pb, "filesize");
286 flv->filesize_offset= avio_tell(pb);
287 put_amf_double(pb, 0); // delayed write
289 put_amf_string(pb, "");
290 avio_w8(pb, AMF_END_OF_OBJECT);
292 /* write total size of tag */
293 data_size= avio_tell(pb) - metadata_size_pos - 10;
294 avio_seek(pb, metadata_size_pos, SEEK_SET);
295 avio_wb24(pb, data_size);
296 avio_skip(pb, data_size + 10 - 3);
297 avio_wb32(pb, data_size + 11);
299 for (i = 0; i < s->nb_streams; i++) {
300 AVCodecContext *enc = s->streams[i]->codec;
301 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
303 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
304 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
305 avio_wb24(pb, 0); // size patched later
306 avio_wb24(pb, 0); // ts
307 avio_w8(pb, 0); // ts ext
308 avio_wb24(pb, 0); // streamid
310 if (enc->codec_id == CODEC_ID_AAC) {
311 avio_w8(pb, get_audio_flags(enc));
312 avio_w8(pb, 0); // AAC sequence header
313 avio_write(pb, enc->extradata, enc->extradata_size);
315 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
316 avio_w8(pb, 0); // AVC sequence header
317 avio_wb24(pb, 0); // composition time
318 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
320 data_size = avio_tell(pb) - pos;
321 avio_seek(pb, -data_size - 10, SEEK_CUR);
322 avio_wb24(pb, data_size);
323 avio_skip(pb, data_size + 10 - 3);
324 avio_wb32(pb, data_size + 11); // previous tag size
331 static int flv_write_trailer(AVFormatContext *s)
335 AVIOContext *pb = s->pb;
336 FLVContext *flv = s->priv_data;
340 for (i = 0; i < s->nb_streams; i++) {
341 AVCodecContext *enc = s->streams[i]->codec;
342 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
343 enc->codec_id == CODEC_ID_H264) {
344 put_avc_eos_tag(pb, flv->last_video_ts);
348 file_size = avio_tell(pb);
350 /* update informations */
351 avio_seek(pb, flv->duration_offset, SEEK_SET);
352 put_amf_double(pb, flv->duration / (double)1000);
353 avio_seek(pb, flv->filesize_offset, SEEK_SET);
354 put_amf_double(pb, file_size);
356 avio_seek(pb, file_size, SEEK_SET);
360 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
362 AVIOContext *pb = s->pb;
363 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
364 FLVContext *flv = s->priv_data;
368 int flags, flags_size;
370 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
372 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
373 enc->codec_id == CODEC_ID_AAC)
375 else if(enc->codec_id == CODEC_ID_H264)
380 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
381 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
383 flags = enc->codec_tag;
385 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
389 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
391 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
392 flags = get_audio_flags(enc);
396 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
399 if (enc->codec_id == CODEC_ID_H264) {
400 /* check if extradata looks like mp4 formated */
401 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
402 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
405 if (!flv->delay && pkt->dts < 0)
406 flv->delay = -pkt->dts;
407 } else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
408 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
409 av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
413 ts = pkt->dts + flv->delay; // add delay to force positive dts
414 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
415 if (flv->last_video_ts < ts)
416 flv->last_video_ts = ts;
418 avio_wb24(pb,size + flags_size);
420 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
421 avio_wb24(pb,flv->reserved);
423 if (enc->codec_id == CODEC_ID_VP6)
425 if (enc->codec_id == CODEC_ID_VP6F)
426 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
427 else if (enc->codec_id == CODEC_ID_AAC)
428 avio_w8(pb,1); // AAC raw
429 else if (enc->codec_id == CODEC_ID_H264) {
430 avio_w8(pb,1); // AVC NALU
431 avio_wb24(pb,pkt->pts - pkt->dts);
434 avio_write(pb, data ? data : pkt->data, size);
436 avio_wb32(pb,size+flags_size+11); // previous tag size
437 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
446 AVOutputFormat ff_flv_muxer = {
448 NULL_IF_CONFIG_SMALL("FLV format"),
452 #if CONFIG_LIBMP3LAME
454 #else // CONFIG_LIBMP3LAME
456 #endif // CONFIG_LIBMP3LAME
461 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
462 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,