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
30 static const AVCodecTag flv_video_codec_ids[] = {
31 {CODEC_ID_FLV1, FLV_CODECID_H263 },
32 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
33 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
34 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
35 {CODEC_ID_VP6, FLV_CODECID_VP6 },
36 {CODEC_ID_H264, FLV_CODECID_H264 },
40 static const AVCodecTag flv_audio_codec_ids[] = {
41 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
42 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
43 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
44 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
45 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
46 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
47 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
48 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
52 typedef struct FLVContext {
54 int64_t duration_offset;
55 int64_t filesize_offset;
57 int delay; ///< first dts delay for AVC
58 int64_t last_video_ts;
61 static int get_audio_flags(AVCodecContext *enc){
62 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
64 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
65 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
66 else if (enc->codec_id == CODEC_ID_SPEEX) {
67 if (enc->sample_rate != 16000) {
68 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
71 if (enc->channels != 1) {
72 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
75 if (enc->frame_size / 320 > 8) {
76 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
77 "8 frames per packet. Adobe Flash "
78 "Player cannot handle this!\n");
80 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
82 switch (enc->sample_rate) {
84 flags |= FLV_SAMPLERATE_44100HZ;
87 flags |= FLV_SAMPLERATE_22050HZ;
90 flags |= FLV_SAMPLERATE_11025HZ;
92 case 8000: //nellymoser only
94 if(enc->codec_id != CODEC_ID_MP3){
95 flags |= FLV_SAMPLERATE_SPECIAL;
99 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
104 if (enc->channels > 1) {
108 switch(enc->codec_id){
110 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
112 case CODEC_ID_PCM_U8:
113 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
115 case CODEC_ID_PCM_S16BE:
116 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
118 case CODEC_ID_PCM_S16LE:
119 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
121 case CODEC_ID_ADPCM_SWF:
122 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
124 case CODEC_ID_NELLYMOSER:
125 if (enc->sample_rate == 8000) {
126 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
128 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
132 flags |= enc->codec_tag<<4;
135 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
142 static void put_amf_string(AVIOContext *pb, const char *str)
144 size_t len = strlen(str);
146 avio_write(pb, str, len);
149 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
150 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
151 avio_wb24(pb, 5); /* Tag Data Size */
152 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
153 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
154 avio_wb24(pb, 0); /* StreamId = 0 */
155 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
156 avio_w8(pb, 2); /* AVC end of sequence */
157 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
158 avio_wb32(pb, 16); /* Size of FLV tag */
161 static void put_amf_double(AVIOContext *pb, double d)
163 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
164 avio_wb64(pb, av_dbl2int(d));
167 static void put_amf_bool(AVIOContext *pb, int b) {
168 avio_w8(pb, AMF_DATA_TYPE_BOOL);
172 static int flv_write_header(AVFormatContext *s)
174 AVIOContext *pb = s->pb;
175 FLVContext *flv = s->priv_data;
176 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
178 double framerate = 0.0;
179 int metadata_size_pos, data_size;
180 AVMetadataTag *tag = NULL;
182 for(i=0; i<s->nb_streams; i++){
183 AVCodecContext *enc = s->streams[i]->codec;
184 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
185 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
186 framerate = av_q2d(s->streams[i]->r_frame_rate);
188 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
191 if(enc->codec_tag == 0) {
192 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
197 if(get_audio_flags(enc)<0)
200 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
202 avio_write(pb, "FLV", 3);
204 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
205 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
209 for(i=0; i<s->nb_streams; i++){
210 if(s->streams[i]->codec->codec_tag == 5){
211 avio_w8(pb,8); // message type
212 avio_wb24(pb,0); // include flags
213 avio_wb24(pb,0); // time stamp
214 avio_wb32(pb,0); // reserved
215 avio_wb32(pb,11); // size
220 flv->last_video_ts = -1;
223 avio_w8(pb, 18); // tag type META
224 metadata_size_pos= avio_tell(pb);
225 avio_wb24(pb, 0); // size of data part (sum of all parts below)
226 avio_wb24(pb, 0); // time stamp
227 avio_wb32(pb, 0); // reserved
229 /* now data of data_size size */
231 /* first event name as a string */
232 avio_w8(pb, AMF_DATA_TYPE_STRING);
233 put_amf_string(pb, "onMetaData"); // 12 bytes
235 /* mixed array (hash) with size and string/type/data tuples */
236 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
237 avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
239 put_amf_string(pb, "duration");
240 flv->duration_offset= avio_tell(pb);
241 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
244 put_amf_string(pb, "width");
245 put_amf_double(pb, video_enc->width);
247 put_amf_string(pb, "height");
248 put_amf_double(pb, video_enc->height);
250 put_amf_string(pb, "videodatarate");
251 put_amf_double(pb, video_enc->bit_rate / 1024.0);
253 put_amf_string(pb, "framerate");
254 put_amf_double(pb, framerate);
256 put_amf_string(pb, "videocodecid");
257 put_amf_double(pb, video_enc->codec_tag);
261 put_amf_string(pb, "audiodatarate");
262 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
264 put_amf_string(pb, "audiosamplerate");
265 put_amf_double(pb, audio_enc->sample_rate);
267 put_amf_string(pb, "audiosamplesize");
268 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
270 put_amf_string(pb, "stereo");
271 put_amf_bool(pb, audio_enc->channels == 2);
273 put_amf_string(pb, "audiocodecid");
274 put_amf_double(pb, audio_enc->codec_tag);
277 while ((tag = av_metadata_get(s->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX))) {
278 put_amf_string(pb, tag->key);
279 avio_w8(pb, AMF_DATA_TYPE_STRING);
280 put_amf_string(pb, tag->value);
283 put_amf_string(pb, "filesize");
284 flv->filesize_offset= avio_tell(pb);
285 put_amf_double(pb, 0); // delayed write
287 put_amf_string(pb, "");
288 avio_w8(pb, AMF_END_OF_OBJECT);
290 /* write total size of tag */
291 data_size= avio_tell(pb) - metadata_size_pos - 10;
292 avio_seek(pb, metadata_size_pos, SEEK_SET);
293 avio_wb24(pb, data_size);
294 avio_skip(pb, data_size + 10 - 3);
295 avio_wb32(pb, data_size + 11);
297 for (i = 0; i < s->nb_streams; i++) {
298 AVCodecContext *enc = s->streams[i]->codec;
299 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
301 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
302 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
303 avio_wb24(pb, 0); // size patched later
304 avio_wb24(pb, 0); // ts
305 avio_w8(pb, 0); // ts ext
306 avio_wb24(pb, 0); // streamid
308 if (enc->codec_id == CODEC_ID_AAC) {
309 avio_w8(pb, get_audio_flags(enc));
310 avio_w8(pb, 0); // AAC sequence header
311 avio_write(pb, enc->extradata, enc->extradata_size);
313 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
314 avio_w8(pb, 0); // AVC sequence header
315 avio_wb24(pb, 0); // composition time
316 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
318 data_size = avio_tell(pb) - pos;
319 avio_seek(pb, -data_size - 10, SEEK_CUR);
320 avio_wb24(pb, data_size);
321 avio_skip(pb, data_size + 10 - 3);
322 avio_wb32(pb, data_size + 11); // previous tag size
329 static int flv_write_trailer(AVFormatContext *s)
333 AVIOContext *pb = s->pb;
334 FLVContext *flv = s->priv_data;
338 for (i = 0; i < s->nb_streams; i++) {
339 AVCodecContext *enc = s->streams[i]->codec;
340 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
341 enc->codec_id == CODEC_ID_H264) {
342 put_avc_eos_tag(pb, flv->last_video_ts);
346 file_size = avio_tell(pb);
348 /* update informations */
349 avio_seek(pb, flv->duration_offset, SEEK_SET);
350 put_amf_double(pb, flv->duration / (double)1000);
351 avio_seek(pb, flv->filesize_offset, SEEK_SET);
352 put_amf_double(pb, file_size);
354 avio_seek(pb, file_size, SEEK_SET);
358 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
360 AVIOContext *pb = s->pb;
361 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
362 FLVContext *flv = s->priv_data;
366 int flags, flags_size;
368 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
370 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
371 enc->codec_id == CODEC_ID_AAC)
373 else if(enc->codec_id == CODEC_ID_H264)
378 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
379 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
381 flags = enc->codec_tag;
383 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
387 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
389 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
390 flags = get_audio_flags(enc);
394 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
397 if (enc->codec_id == CODEC_ID_H264) {
398 /* check if extradata looks like mp4 formated */
399 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
400 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
403 if (!flv->delay && pkt->dts < 0)
404 flv->delay = -pkt->dts;
407 ts = pkt->dts + flv->delay; // add delay to force positive dts
408 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
409 if (flv->last_video_ts < ts)
410 flv->last_video_ts = ts;
412 avio_wb24(pb,size + flags_size);
414 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
415 avio_wb24(pb,flv->reserved);
417 if (enc->codec_id == CODEC_ID_VP6)
419 if (enc->codec_id == CODEC_ID_VP6F)
420 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
421 else if (enc->codec_id == CODEC_ID_AAC)
422 avio_w8(pb,1); // AAC raw
423 else if (enc->codec_id == CODEC_ID_H264) {
424 avio_w8(pb,1); // AVC NALU
425 avio_wb24(pb,pkt->pts - pkt->dts);
428 avio_write(pb, data ? data : pkt->data, size);
430 avio_wb32(pb,size+flags_size+11); // previous tag size
431 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
440 AVOutputFormat ff_flv_muxer = {
442 NULL_IF_CONFIG_SMALL("FLV format"),
446 #if CONFIG_LIBMP3LAME
448 #else // CONFIG_LIBMP3LAME
450 #endif // CONFIG_LIBMP3LAME
455 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
456 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,