3 * Copyright (c) 2003 The Libav Project
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/dict.h"
31 static const AVCodecTag flv_video_codec_ids[] = {
32 {CODEC_ID_FLV1, FLV_CODECID_H263 },
33 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
34 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
35 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
36 {CODEC_ID_VP6, FLV_CODECID_VP6 },
37 {CODEC_ID_H264, FLV_CODECID_H264 },
41 static const AVCodecTag flv_audio_codec_ids[] = {
42 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
43 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
44 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
45 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
46 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
47 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
48 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
49 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
53 typedef struct FLVContext {
55 int64_t duration_offset;
56 int64_t filesize_offset;
58 int delay; ///< first dts delay for AVC
59 int64_t last_video_ts;
62 static int get_audio_flags(AVCodecContext *enc){
63 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
65 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
66 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
67 else if (enc->codec_id == CODEC_ID_SPEEX) {
68 if (enc->sample_rate != 16000) {
69 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
72 if (enc->channels != 1) {
73 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
76 if (enc->frame_size / 320 > 8) {
77 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
78 "8 frames per packet. Adobe Flash "
79 "Player cannot handle this!\n");
81 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
83 switch (enc->sample_rate) {
85 flags |= FLV_SAMPLERATE_44100HZ;
88 flags |= FLV_SAMPLERATE_22050HZ;
91 flags |= FLV_SAMPLERATE_11025HZ;
93 case 8000: //nellymoser only
95 if(enc->codec_id != CODEC_ID_MP3){
96 flags |= FLV_SAMPLERATE_SPECIAL;
100 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
105 if (enc->channels > 1) {
109 switch(enc->codec_id){
111 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
113 case CODEC_ID_PCM_U8:
114 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
116 case CODEC_ID_PCM_S16BE:
117 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
119 case CODEC_ID_PCM_S16LE:
120 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
122 case CODEC_ID_ADPCM_SWF:
123 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
125 case CODEC_ID_NELLYMOSER:
126 if (enc->sample_rate == 8000) {
127 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
129 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
133 flags |= enc->codec_tag<<4;
136 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
143 static void put_amf_string(AVIOContext *pb, const char *str)
145 size_t len = strlen(str);
147 avio_write(pb, str, len);
150 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
151 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
152 avio_wb24(pb, 5); /* Tag Data Size */
153 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
154 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
155 avio_wb24(pb, 0); /* StreamId = 0 */
156 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
157 avio_w8(pb, 2); /* AVC end of sequence */
158 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
159 avio_wb32(pb, 16); /* Size of FLV tag */
162 static void put_amf_double(AVIOContext *pb, double d)
164 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
165 avio_wb64(pb, av_dbl2int(d));
168 static void put_amf_bool(AVIOContext *pb, int b) {
169 avio_w8(pb, AMF_DATA_TYPE_BOOL);
173 static int flv_write_header(AVFormatContext *s)
175 AVIOContext *pb = s->pb;
176 FLVContext *flv = s->priv_data;
177 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
179 double framerate = 0.0;
180 int metadata_size_pos, data_size;
181 AVDictionaryEntry *tag = NULL;
183 for(i=0; i<s->nb_streams; i++){
184 AVCodecContext *enc = s->streams[i]->codec;
185 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
186 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
187 framerate = av_q2d(s->streams[i]->r_frame_rate);
189 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
192 if(enc->codec_tag == 0) {
193 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
198 if(get_audio_flags(enc)<0)
201 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
203 avio_write(pb, "FLV", 3);
205 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
206 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
210 for(i=0; i<s->nb_streams; i++){
211 if(s->streams[i]->codec->codec_tag == 5){
212 avio_w8(pb,8); // message type
213 avio_wb24(pb,0); // include flags
214 avio_wb24(pb,0); // time stamp
215 avio_wb32(pb,0); // reserved
216 avio_wb32(pb,11); // size
221 flv->last_video_ts = -1;
224 avio_w8(pb, 18); // tag type META
225 metadata_size_pos= avio_tell(pb);
226 avio_wb24(pb, 0); // size of data part (sum of all parts below)
227 avio_wb24(pb, 0); // time stamp
228 avio_wb32(pb, 0); // reserved
230 /* now data of data_size size */
232 /* first event name as a string */
233 avio_w8(pb, AMF_DATA_TYPE_STRING);
234 put_amf_string(pb, "onMetaData"); // 12 bytes
236 /* mixed array (hash) with size and string/type/data tuples */
237 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
238 avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
240 put_amf_string(pb, "duration");
241 flv->duration_offset= avio_tell(pb);
242 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
245 put_amf_string(pb, "width");
246 put_amf_double(pb, video_enc->width);
248 put_amf_string(pb, "height");
249 put_amf_double(pb, video_enc->height);
251 put_amf_string(pb, "videodatarate");
252 put_amf_double(pb, video_enc->bit_rate / 1024.0);
254 put_amf_string(pb, "framerate");
255 put_amf_double(pb, framerate);
257 put_amf_string(pb, "videocodecid");
258 put_amf_double(pb, video_enc->codec_tag);
262 put_amf_string(pb, "audiodatarate");
263 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
265 put_amf_string(pb, "audiosamplerate");
266 put_amf_double(pb, audio_enc->sample_rate);
268 put_amf_string(pb, "audiosamplesize");
269 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
271 put_amf_string(pb, "stereo");
272 put_amf_bool(pb, audio_enc->channels == 2);
274 put_amf_string(pb, "audiocodecid");
275 put_amf_double(pb, audio_enc->codec_tag);
278 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
279 put_amf_string(pb, tag->key);
280 avio_w8(pb, AMF_DATA_TYPE_STRING);
281 put_amf_string(pb, tag->value);
284 put_amf_string(pb, "filesize");
285 flv->filesize_offset= avio_tell(pb);
286 put_amf_double(pb, 0); // delayed write
288 put_amf_string(pb, "");
289 avio_w8(pb, AMF_END_OF_OBJECT);
291 /* write total size of tag */
292 data_size= avio_tell(pb) - metadata_size_pos - 10;
293 avio_seek(pb, metadata_size_pos, SEEK_SET);
294 avio_wb24(pb, data_size);
295 avio_skip(pb, data_size + 10 - 3);
296 avio_wb32(pb, data_size + 11);
298 for (i = 0; i < s->nb_streams; i++) {
299 AVCodecContext *enc = s->streams[i]->codec;
300 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
302 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
303 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
304 avio_wb24(pb, 0); // size patched later
305 avio_wb24(pb, 0); // ts
306 avio_w8(pb, 0); // ts ext
307 avio_wb24(pb, 0); // streamid
309 if (enc->codec_id == CODEC_ID_AAC) {
310 avio_w8(pb, get_audio_flags(enc));
311 avio_w8(pb, 0); // AAC sequence header
312 avio_write(pb, enc->extradata, enc->extradata_size);
314 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
315 avio_w8(pb, 0); // AVC sequence header
316 avio_wb24(pb, 0); // composition time
317 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
319 data_size = avio_tell(pb) - pos;
320 avio_seek(pb, -data_size - 10, SEEK_CUR);
321 avio_wb24(pb, data_size);
322 avio_skip(pb, data_size + 10 - 3);
323 avio_wb32(pb, data_size + 11); // previous tag size
330 static int flv_write_trailer(AVFormatContext *s)
334 AVIOContext *pb = s->pb;
335 FLVContext *flv = s->priv_data;
339 for (i = 0; i < s->nb_streams; i++) {
340 AVCodecContext *enc = s->streams[i]->codec;
341 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
342 enc->codec_id == CODEC_ID_H264) {
343 put_avc_eos_tag(pb, flv->last_video_ts);
347 file_size = avio_tell(pb);
349 /* update informations */
350 avio_seek(pb, flv->duration_offset, SEEK_SET);
351 put_amf_double(pb, flv->duration / (double)1000);
352 avio_seek(pb, flv->filesize_offset, SEEK_SET);
353 put_amf_double(pb, file_size);
355 avio_seek(pb, file_size, SEEK_SET);
359 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
361 AVIOContext *pb = s->pb;
362 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
363 FLVContext *flv = s->priv_data;
367 int flags, flags_size;
369 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
371 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
372 enc->codec_id == CODEC_ID_AAC)
374 else if(enc->codec_id == CODEC_ID_H264)
379 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
380 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
382 flags = enc->codec_tag;
384 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
388 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
390 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
391 flags = get_audio_flags(enc);
395 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
398 if (enc->codec_id == CODEC_ID_H264) {
399 /* check if extradata looks like mp4 formated */
400 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
401 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
404 if (!flv->delay && pkt->dts < 0)
405 flv->delay = -pkt->dts;
408 ts = pkt->dts + flv->delay; // add delay to force positive dts
409 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
410 if (flv->last_video_ts < ts)
411 flv->last_video_ts = ts;
413 avio_wb24(pb,size + flags_size);
415 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
416 avio_wb24(pb,flv->reserved);
418 if (enc->codec_id == CODEC_ID_VP6)
420 if (enc->codec_id == CODEC_ID_VP6F)
421 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
422 else if (enc->codec_id == CODEC_ID_AAC)
423 avio_w8(pb,1); // AAC raw
424 else if (enc->codec_id == CODEC_ID_H264) {
425 avio_w8(pb,1); // AVC NALU
426 avio_wb24(pb,pkt->pts - pkt->dts);
429 avio_write(pb, data ? data : pkt->data, size);
431 avio_wb32(pb,size+flags_size+11); // previous tag size
432 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
441 AVOutputFormat ff_flv_muxer = {
443 NULL_IF_CONFIG_SMALL("FLV format"),
447 #if CONFIG_LIBMP3LAME
449 #else // CONFIG_LIBMP3LAME
451 #endif // CONFIG_LIBMP3LAME
456 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
457 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,