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
29 static const AVCodecTag flv_video_codec_ids[] = {
30 {CODEC_ID_FLV1, FLV_CODECID_H263 },
31 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
32 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
33 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
34 {CODEC_ID_VP6, FLV_CODECID_VP6 },
35 {CODEC_ID_H264, FLV_CODECID_H264 },
39 static const AVCodecTag flv_audio_codec_ids[] = {
40 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
41 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
42 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
43 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
44 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
45 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
46 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
47 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
51 typedef struct FLVContext {
53 int64_t duration_offset;
54 int64_t filesize_offset;
56 int delay; ///< first dts delay for AVC
57 int64_t last_video_ts;
60 static int get_audio_flags(AVCodecContext *enc){
61 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
63 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
64 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
65 else if (enc->codec_id == CODEC_ID_SPEEX) {
66 if (enc->sample_rate != 16000) {
67 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
70 if (enc->channels != 1) {
71 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
74 if (enc->frame_size / 320 > 8) {
75 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
76 "8 frames per packet. Adobe Flash "
77 "Player cannot handle this!\n");
79 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
81 switch (enc->sample_rate) {
83 flags |= FLV_SAMPLERATE_44100HZ;
86 flags |= FLV_SAMPLERATE_22050HZ;
89 flags |= FLV_SAMPLERATE_11025HZ;
91 case 8000: //nellymoser only
93 if(enc->codec_id != CODEC_ID_MP3){
94 flags |= FLV_SAMPLERATE_SPECIAL;
98 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
103 if (enc->channels > 1) {
107 switch(enc->codec_id){
109 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
111 case CODEC_ID_PCM_U8:
112 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
114 case CODEC_ID_PCM_S16BE:
115 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
117 case CODEC_ID_PCM_S16LE:
118 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
120 case CODEC_ID_ADPCM_SWF:
121 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
123 case CODEC_ID_NELLYMOSER:
124 if (enc->sample_rate == 8000) {
125 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
127 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
131 flags |= enc->codec_tag<<4;
134 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
141 static void put_amf_string(ByteIOContext *pb, const char *str)
143 size_t len = strlen(str);
145 put_buffer(pb, str, len);
148 static void put_avc_eos_tag(ByteIOContext *pb, unsigned ts) {
149 put_byte(pb, FLV_TAG_TYPE_VIDEO);
150 put_be24(pb, 5); /* Tag Data Size */
151 put_be24(pb, ts); /* lower 24 bits of timestamp in ms*/
152 put_byte(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
153 put_be24(pb, 0); /* StreamId = 0 */
154 put_byte(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
155 put_byte(pb, 2); /* AVC end of sequence */
156 put_be24(pb, 0); /* Always 0 for AVC EOS. */
157 put_be32(pb, 16); /* Size of FLV tag */
160 static void put_amf_double(ByteIOContext *pb, double d)
162 put_byte(pb, AMF_DATA_TYPE_NUMBER);
163 put_be64(pb, av_dbl2int(d));
166 static void put_amf_bool(ByteIOContext *pb, int b) {
167 put_byte(pb, AMF_DATA_TYPE_BOOL);
171 static int flv_write_header(AVFormatContext *s)
173 ByteIOContext *pb = s->pb;
174 FLVContext *flv = s->priv_data;
175 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
177 double framerate = 0.0;
178 int metadata_size_pos, data_size;
180 for(i=0; i<s->nb_streams; i++){
181 AVCodecContext *enc = s->streams[i]->codec;
182 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
183 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
184 framerate = av_q2d(s->streams[i]->r_frame_rate);
186 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
189 if(enc->codec_tag == 0) {
190 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
195 if(get_audio_flags(enc)<0)
198 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
202 put_byte(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
203 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
207 for(i=0; i<s->nb_streams; i++){
208 if(s->streams[i]->codec->codec_tag == 5){
209 put_byte(pb,8); // message type
210 put_be24(pb,0); // include flags
211 put_be24(pb,0); // time stamp
212 put_be32(pb,0); // reserved
213 put_be32(pb,11); // size
218 flv->last_video_ts = -1;
221 put_byte(pb, 18); // tag type META
222 metadata_size_pos= url_ftell(pb);
223 put_be24(pb, 0); // size of data part (sum of all parts below)
224 put_be24(pb, 0); // time stamp
225 put_be32(pb, 0); // reserved
227 /* now data of data_size size */
229 /* first event name as a string */
230 put_byte(pb, AMF_DATA_TYPE_STRING);
231 put_amf_string(pb, "onMetaData"); // 12 bytes
233 /* mixed array (hash) with size and string/type/data tuples */
234 put_byte(pb, AMF_DATA_TYPE_MIXEDARRAY);
235 put_be32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
237 put_amf_string(pb, "duration");
238 flv->duration_offset= url_ftell(pb);
239 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
242 put_amf_string(pb, "width");
243 put_amf_double(pb, video_enc->width);
245 put_amf_string(pb, "height");
246 put_amf_double(pb, video_enc->height);
248 put_amf_string(pb, "videodatarate");
249 put_amf_double(pb, video_enc->bit_rate / 1024.0);
251 put_amf_string(pb, "framerate");
252 put_amf_double(pb, framerate);
254 put_amf_string(pb, "videocodecid");
255 put_amf_double(pb, video_enc->codec_tag);
259 put_amf_string(pb, "audiodatarate");
260 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
262 put_amf_string(pb, "audiosamplerate");
263 put_amf_double(pb, audio_enc->sample_rate);
265 put_amf_string(pb, "audiosamplesize");
266 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
268 put_amf_string(pb, "stereo");
269 put_amf_bool(pb, audio_enc->channels == 2);
271 put_amf_string(pb, "audiocodecid");
272 put_amf_double(pb, audio_enc->codec_tag);
275 put_amf_string(pb, "filesize");
276 flv->filesize_offset= url_ftell(pb);
277 put_amf_double(pb, 0); // delayed write
279 put_amf_string(pb, "");
280 put_byte(pb, AMF_END_OF_OBJECT);
282 /* write total size of tag */
283 data_size= url_ftell(pb) - metadata_size_pos - 10;
284 url_fseek(pb, metadata_size_pos, SEEK_SET);
285 put_be24(pb, data_size);
286 url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
287 put_be32(pb, data_size + 11);
289 for (i = 0; i < s->nb_streams; i++) {
290 AVCodecContext *enc = s->streams[i]->codec;
291 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
293 put_byte(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
294 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
295 put_be24(pb, 0); // size patched later
296 put_be24(pb, 0); // ts
297 put_byte(pb, 0); // ts ext
298 put_be24(pb, 0); // streamid
300 if (enc->codec_id == CODEC_ID_AAC) {
301 put_byte(pb, get_audio_flags(enc));
302 put_byte(pb, 0); // AAC sequence header
303 put_buffer(pb, enc->extradata, enc->extradata_size);
305 put_byte(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
306 put_byte(pb, 0); // AVC sequence header
307 put_be24(pb, 0); // composition time
308 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
310 data_size = url_ftell(pb) - pos;
311 url_fseek(pb, -data_size - 10, SEEK_CUR);
312 put_be24(pb, data_size);
313 url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
314 put_be32(pb, data_size + 11); // previous tag size
321 static int flv_write_trailer(AVFormatContext *s)
325 ByteIOContext *pb = s->pb;
326 FLVContext *flv = s->priv_data;
330 for (i = 0; i < s->nb_streams; i++) {
331 AVCodecContext *enc = s->streams[i]->codec;
332 if (enc->codec_type == CODEC_TYPE_VIDEO &&
333 enc->codec_id == CODEC_ID_H264) {
334 put_avc_eos_tag(pb, flv->last_video_ts);
338 file_size = url_ftell(pb);
340 /* update informations */
341 url_fseek(pb, flv->duration_offset, SEEK_SET);
342 put_amf_double(pb, flv->duration / (double)1000);
343 url_fseek(pb, flv->filesize_offset, SEEK_SET);
344 put_amf_double(pb, file_size);
346 url_fseek(pb, file_size, SEEK_SET);
350 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
352 ByteIOContext *pb = s->pb;
353 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
354 FLVContext *flv = s->priv_data;
358 int flags, flags_size;
360 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
362 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
363 enc->codec_id == CODEC_ID_AAC)
365 else if(enc->codec_id == CODEC_ID_H264)
370 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
371 put_byte(pb, FLV_TAG_TYPE_VIDEO);
373 flags = enc->codec_tag;
375 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
379 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
381 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
382 flags = get_audio_flags(enc);
386 put_byte(pb, FLV_TAG_TYPE_AUDIO);
389 if (enc->codec_id == CODEC_ID_H264) {
390 /* check if extradata looks like mp4 formated */
391 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
392 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
395 if (!flv->delay && pkt->dts < 0)
396 flv->delay = -pkt->dts;
399 ts = pkt->dts + flv->delay; // add delay to force positive dts
400 if (enc->codec_type == CODEC_TYPE_VIDEO) {
401 if (flv->last_video_ts < ts)
402 flv->last_video_ts = ts;
404 put_be24(pb,size + flags_size);
406 put_byte(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
407 put_be24(pb,flv->reserved);
409 if (enc->codec_id == CODEC_ID_VP6)
411 if (enc->codec_id == CODEC_ID_VP6F)
412 put_byte(pb, enc->extradata_size ? enc->extradata[0] : 0);
413 else if (enc->codec_id == CODEC_ID_AAC)
414 put_byte(pb,1); // AAC raw
415 else if (enc->codec_id == CODEC_ID_H264) {
416 put_byte(pb,1); // AVC NALU
417 put_be24(pb,pkt->pts - pkt->dts);
420 put_buffer(pb, data ? data : pkt->data, size);
422 put_be32(pb,size+flags_size+11); // previous tag size
423 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
425 put_flush_packet(pb);
432 AVOutputFormat flv_muxer = {
434 NULL_IF_CONFIG_SMALL("FLV format"),
438 #if CONFIG_LIBMP3LAME
440 #else // CONFIG_LIBMP3LAME
442 #endif // CONFIG_LIBMP3LAME
447 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
448 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,