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"
28 #include "libavutil/dict.h"
33 static const AVCodecTag flv_video_codec_ids[] = {
34 {CODEC_ID_FLV1, FLV_CODECID_H263 },
35 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
36 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
37 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
38 {CODEC_ID_VP6, FLV_CODECID_VP6 },
39 {CODEC_ID_H264, FLV_CODECID_H264 },
43 static const AVCodecTag flv_audio_codec_ids[] = {
44 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
45 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
46 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
47 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
48 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
49 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
50 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
51 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
55 typedef struct FLVContext {
57 int64_t duration_offset;
58 int64_t filesize_offset;
60 int delay; ///< first dts delay for AVC
61 int64_t last_video_ts;
64 static int get_audio_flags(AVCodecContext *enc){
65 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
67 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
68 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
69 else if (enc->codec_id == CODEC_ID_SPEEX) {
70 if (enc->sample_rate != 16000) {
71 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
74 if (enc->channels != 1) {
75 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
78 if (enc->frame_size / 320 > 8) {
79 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
80 "8 frames per packet. Adobe Flash "
81 "Player cannot handle this!\n");
83 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
85 switch (enc->sample_rate) {
87 flags |= FLV_SAMPLERATE_44100HZ;
90 flags |= FLV_SAMPLERATE_22050HZ;
93 flags |= FLV_SAMPLERATE_11025HZ;
95 case 8000: //nellymoser only
97 if(enc->codec_id != CODEC_ID_MP3){
98 flags |= FLV_SAMPLERATE_SPECIAL;
102 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
107 if (enc->channels > 1) {
111 switch(enc->codec_id){
113 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
115 case CODEC_ID_PCM_U8:
116 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
118 case CODEC_ID_PCM_S16BE:
119 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
121 case CODEC_ID_PCM_S16LE:
122 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
124 case CODEC_ID_ADPCM_SWF:
125 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
127 case CODEC_ID_NELLYMOSER:
128 if (enc->sample_rate == 8000) {
129 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
131 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
135 flags |= enc->codec_tag<<4;
138 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
145 static void put_amf_string(AVIOContext *pb, const char *str)
147 size_t len = strlen(str);
149 avio_write(pb, str, len);
152 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
153 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
154 avio_wb24(pb, 5); /* Tag Data Size */
155 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
156 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
157 avio_wb24(pb, 0); /* StreamId = 0 */
158 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
159 avio_w8(pb, 2); /* AVC end of sequence */
160 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
161 avio_wb32(pb, 16); /* Size of FLV tag */
164 static void put_amf_double(AVIOContext *pb, double d)
166 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
167 avio_wb64(pb, av_dbl2int(d));
170 static void put_amf_bool(AVIOContext *pb, int b) {
171 avio_w8(pb, AMF_DATA_TYPE_BOOL);
175 static int flv_write_header(AVFormatContext *s)
177 AVIOContext *pb = s->pb;
178 FLVContext *flv = s->priv_data;
179 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
181 double framerate = 0.0;
182 int metadata_size_pos, data_size;
183 AVDictionaryEntry *tag = NULL;
185 for(i=0; i<s->nb_streams; i++){
186 AVCodecContext *enc = s->streams[i]->codec;
187 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
188 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
189 framerate = av_q2d(s->streams[i]->r_frame_rate);
191 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
194 if(enc->codec_tag == 0) {
195 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
200 if(get_audio_flags(enc)<0)
203 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
205 avio_write(pb, "FLV", 3);
207 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
208 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
212 for(i=0; i<s->nb_streams; i++){
213 if(s->streams[i]->codec->codec_tag == 5){
214 avio_w8(pb,8); // message type
215 avio_wb24(pb,0); // include flags
216 avio_wb24(pb,0); // time stamp
217 avio_wb32(pb,0); // reserved
218 avio_wb32(pb,11); // size
223 flv->last_video_ts = -1;
226 avio_w8(pb, 18); // tag type META
227 metadata_size_pos= avio_tell(pb);
228 avio_wb24(pb, 0); // size of data part (sum of all parts below)
229 avio_wb24(pb, 0); // time stamp
230 avio_wb32(pb, 0); // reserved
232 /* now data of data_size size */
234 /* first event name as a string */
235 avio_w8(pb, AMF_DATA_TYPE_STRING);
236 put_amf_string(pb, "onMetaData"); // 12 bytes
238 /* mixed array (hash) with size and string/type/data tuples */
239 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
240 avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
242 put_amf_string(pb, "duration");
243 flv->duration_offset= avio_tell(pb);
244 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
247 put_amf_string(pb, "width");
248 put_amf_double(pb, video_enc->width);
250 put_amf_string(pb, "height");
251 put_amf_double(pb, video_enc->height);
253 put_amf_string(pb, "videodatarate");
254 put_amf_double(pb, video_enc->bit_rate / 1024.0);
256 put_amf_string(pb, "framerate");
257 put_amf_double(pb, framerate);
259 put_amf_string(pb, "videocodecid");
260 put_amf_double(pb, video_enc->codec_tag);
264 put_amf_string(pb, "audiodatarate");
265 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
267 put_amf_string(pb, "audiosamplerate");
268 put_amf_double(pb, audio_enc->sample_rate);
270 put_amf_string(pb, "audiosamplesize");
271 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
273 put_amf_string(pb, "stereo");
274 put_amf_bool(pb, audio_enc->channels == 2);
276 put_amf_string(pb, "audiocodecid");
277 put_amf_double(pb, audio_enc->codec_tag);
280 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
281 put_amf_string(pb, tag->key);
282 avio_w8(pb, AMF_DATA_TYPE_STRING);
283 put_amf_string(pb, tag->value);
286 put_amf_string(pb, "filesize");
287 flv->filesize_offset= avio_tell(pb);
288 put_amf_double(pb, 0); // delayed write
290 put_amf_string(pb, "");
291 avio_w8(pb, AMF_END_OF_OBJECT);
293 /* write total size of tag */
294 data_size= avio_tell(pb) - metadata_size_pos - 10;
295 avio_seek(pb, metadata_size_pos, SEEK_SET);
296 avio_wb24(pb, data_size);
297 avio_skip(pb, data_size + 10 - 3);
298 avio_wb32(pb, data_size + 11);
300 for (i = 0; i < s->nb_streams; i++) {
301 AVCodecContext *enc = s->streams[i]->codec;
302 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
304 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
305 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
306 avio_wb24(pb, 0); // size patched later
307 avio_wb24(pb, 0); // ts
308 avio_w8(pb, 0); // ts ext
309 avio_wb24(pb, 0); // streamid
311 if (enc->codec_id == CODEC_ID_AAC) {
312 avio_w8(pb, get_audio_flags(enc));
313 avio_w8(pb, 0); // AAC sequence header
314 avio_write(pb, enc->extradata, enc->extradata_size);
316 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
317 avio_w8(pb, 0); // AVC sequence header
318 avio_wb24(pb, 0); // composition time
319 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
321 data_size = avio_tell(pb) - pos;
322 avio_seek(pb, -data_size - 10, SEEK_CUR);
323 avio_wb24(pb, data_size);
324 avio_skip(pb, data_size + 10 - 3);
325 avio_wb32(pb, data_size + 11); // previous tag size
332 static int flv_write_trailer(AVFormatContext *s)
336 AVIOContext *pb = s->pb;
337 FLVContext *flv = s->priv_data;
341 for (i = 0; i < s->nb_streams; i++) {
342 AVCodecContext *enc = s->streams[i]->codec;
343 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
344 enc->codec_id == CODEC_ID_H264) {
345 put_avc_eos_tag(pb, flv->last_video_ts);
349 file_size = avio_tell(pb);
351 /* update informations */
352 avio_seek(pb, flv->duration_offset, SEEK_SET);
353 put_amf_double(pb, flv->duration / (double)1000);
354 avio_seek(pb, flv->filesize_offset, SEEK_SET);
355 put_amf_double(pb, file_size);
357 avio_seek(pb, file_size, SEEK_SET);
361 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
363 AVIOContext *pb = s->pb;
364 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
365 FLVContext *flv = s->priv_data;
369 int flags, flags_size;
371 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
373 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
374 enc->codec_id == CODEC_ID_AAC)
376 else if(enc->codec_id == CODEC_ID_H264)
381 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
382 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
384 flags = enc->codec_tag;
386 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
390 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
392 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
393 flags = get_audio_flags(enc);
397 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
400 if (enc->codec_id == CODEC_ID_H264) {
401 /* check if extradata looks like mp4 formated */
402 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
403 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
406 if (!flv->delay && pkt->dts < 0)
407 flv->delay = -pkt->dts;
408 } else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
409 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
410 av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
414 ts = pkt->dts + flv->delay; // add delay to force positive dts
415 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
416 if (flv->last_video_ts < ts)
417 flv->last_video_ts = ts;
419 avio_wb24(pb,size + flags_size);
421 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
422 avio_wb24(pb,flv->reserved);
424 if (enc->codec_id == CODEC_ID_VP6)
426 if (enc->codec_id == CODEC_ID_VP6F)
427 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
428 else if (enc->codec_id == CODEC_ID_AAC)
429 avio_w8(pb,1); // AAC raw
430 else if (enc->codec_id == CODEC_ID_H264) {
431 avio_w8(pb,1); // AVC NALU
432 avio_wb24(pb,pkt->pts - pkt->dts);
435 avio_write(pb, data ? data : pkt->data, size);
437 avio_wb32(pb,size+flags_size+11); // previous tag size
438 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
447 AVOutputFormat ff_flv_muxer = {
449 NULL_IF_CONFIG_SMALL("FLV format"),
453 #if CONFIG_LIBMP3LAME
455 #else // CONFIG_LIBMP3LAME
457 #endif // CONFIG_LIBMP3LAME
462 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
463 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,