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
22 #include "libavutil/intfloat_readwrite.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;
62 typedef struct FLVStreamContext {
63 int delay; ///< first dts delay for each stream (needed for AVC & Speex)
64 int64_t last_ts; ///< last timestamp for each stream
67 static int get_audio_flags(AVCodecContext *enc){
68 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
70 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
71 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
72 else if (enc->codec_id == CODEC_ID_SPEEX) {
73 if (enc->sample_rate != 16000) {
74 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
77 if (enc->channels != 1) {
78 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\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;
178 int i, metadata_count = 0;
179 double framerate = 0.0;
180 int64_t metadata_size_pos, data_size, metadata_count_pos;
181 AVDictionaryEntry *tag = NULL;
183 for(i=0; i<s->nb_streams; i++){
184 AVCodecContext *enc = s->streams[i]->codec;
185 FLVStreamContext *sc;
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 sc = av_mallocz(sizeof(FLVStreamContext));
206 return AVERROR(ENOMEM);
207 s->streams[i]->priv_data = sc;
210 avio_write(pb, "FLV", 3);
212 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
213 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
217 for(i=0; i<s->nb_streams; i++){
218 if(s->streams[i]->codec->codec_tag == 5){
219 avio_w8(pb,8); // message type
220 avio_wb24(pb,0); // include flags
221 avio_wb24(pb,0); // time stamp
222 avio_wb32(pb,0); // reserved
223 avio_wb32(pb,11); // size
229 avio_w8(pb, 18); // tag type META
230 metadata_size_pos= avio_tell(pb);
231 avio_wb24(pb, 0); // size of data part (sum of all parts below)
232 avio_wb24(pb, 0); // time stamp
233 avio_wb32(pb, 0); // reserved
235 /* now data of data_size size */
237 /* first event name as a string */
238 avio_w8(pb, AMF_DATA_TYPE_STRING);
239 put_amf_string(pb, "onMetaData"); // 12 bytes
241 /* mixed array (hash) with size and string/type/data tuples */
242 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
243 metadata_count_pos = avio_tell(pb);
244 metadata_count = 5*!!video_enc + 5*!!audio_enc + 2; // +2 for duration and file size
245 avio_wb32(pb, metadata_count);
247 put_amf_string(pb, "duration");
248 flv->duration_offset= avio_tell(pb);
249 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
252 put_amf_string(pb, "width");
253 put_amf_double(pb, video_enc->width);
255 put_amf_string(pb, "height");
256 put_amf_double(pb, video_enc->height);
258 put_amf_string(pb, "videodatarate");
259 put_amf_double(pb, video_enc->bit_rate / 1024.0);
261 put_amf_string(pb, "framerate");
262 put_amf_double(pb, framerate);
264 put_amf_string(pb, "videocodecid");
265 put_amf_double(pb, video_enc->codec_tag);
269 put_amf_string(pb, "audiodatarate");
270 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
272 put_amf_string(pb, "audiosamplerate");
273 put_amf_double(pb, audio_enc->sample_rate);
275 put_amf_string(pb, "audiosamplesize");
276 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
278 put_amf_string(pb, "stereo");
279 put_amf_bool(pb, audio_enc->channels == 2);
281 put_amf_string(pb, "audiocodecid");
282 put_amf_double(pb, audio_enc->codec_tag);
285 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
286 put_amf_string(pb, tag->key);
287 avio_w8(pb, AMF_DATA_TYPE_STRING);
288 put_amf_string(pb, tag->value);
292 put_amf_string(pb, "filesize");
293 flv->filesize_offset= avio_tell(pb);
294 put_amf_double(pb, 0); // delayed write
296 put_amf_string(pb, "");
297 avio_w8(pb, AMF_END_OF_OBJECT);
299 /* write total size of tag */
300 data_size= avio_tell(pb) - metadata_size_pos - 10;
302 avio_seek(pb, metadata_count_pos, SEEK_SET);
303 avio_wb32(pb, metadata_count);
305 avio_seek(pb, metadata_size_pos, SEEK_SET);
306 avio_wb24(pb, data_size);
307 avio_skip(pb, data_size + 10 - 3);
308 avio_wb32(pb, data_size + 11);
310 for (i = 0; i < s->nb_streams; i++) {
311 AVCodecContext *enc = s->streams[i]->codec;
312 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
314 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
315 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
316 avio_wb24(pb, 0); // size patched later
317 avio_wb24(pb, 0); // ts
318 avio_w8(pb, 0); // ts ext
319 avio_wb24(pb, 0); // streamid
321 if (enc->codec_id == CODEC_ID_AAC) {
322 avio_w8(pb, get_audio_flags(enc));
323 avio_w8(pb, 0); // AAC sequence header
324 avio_write(pb, enc->extradata, enc->extradata_size);
326 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
327 avio_w8(pb, 0); // AVC sequence header
328 avio_wb24(pb, 0); // composition time
329 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
331 data_size = avio_tell(pb) - pos;
332 avio_seek(pb, -data_size - 10, SEEK_CUR);
333 avio_wb24(pb, data_size);
334 avio_skip(pb, data_size + 10 - 3);
335 avio_wb32(pb, data_size + 11); // previous tag size
342 static int flv_write_trailer(AVFormatContext *s)
346 AVIOContext *pb = s->pb;
347 FLVContext *flv = s->priv_data;
351 for (i = 0; i < s->nb_streams; i++) {
352 AVCodecContext *enc = s->streams[i]->codec;
353 FLVStreamContext *sc = s->streams[i]->priv_data;
354 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
355 enc->codec_id == CODEC_ID_H264) {
356 put_avc_eos_tag(pb, sc->last_ts);
360 file_size = avio_tell(pb);
362 /* update informations */
363 avio_seek(pb, flv->duration_offset, SEEK_SET);
364 put_amf_double(pb, flv->duration / (double)1000);
365 avio_seek(pb, flv->filesize_offset, SEEK_SET);
366 put_amf_double(pb, file_size);
368 avio_seek(pb, file_size, SEEK_SET);
372 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
374 AVIOContext *pb = s->pb;
375 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
376 FLVContext *flv = s->priv_data;
377 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
381 int flags, flags_size;
383 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
385 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
386 enc->codec_id == CODEC_ID_AAC)
388 else if(enc->codec_id == CODEC_ID_H264)
393 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
394 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
396 flags = enc->codec_tag;
398 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
402 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
404 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
405 flags = get_audio_flags(enc);
409 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
412 if (enc->codec_id == CODEC_ID_H264) {
413 /* check if extradata looks like mp4 formated */
414 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
415 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
419 if (!sc->delay && pkt->dts < 0)
420 sc->delay = -pkt->dts;
422 ts = pkt->dts + sc->delay; // add delay to force positive dts
424 /* check Speex packet duration */
425 if (enc->codec_id == CODEC_ID_SPEEX && ts - sc->last_ts > 160) {
426 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
427 "8 frames per packet. Adobe Flash "
428 "Player cannot handle this!\n");
431 if (sc->last_ts < ts)
434 avio_wb24(pb,size + flags_size);
436 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
437 avio_wb24(pb,flv->reserved);
439 if (enc->codec_id == CODEC_ID_VP6)
441 if (enc->codec_id == CODEC_ID_VP6F)
442 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
443 else if (enc->codec_id == CODEC_ID_AAC)
444 avio_w8(pb,1); // AAC raw
445 else if (enc->codec_id == CODEC_ID_H264) {
446 avio_w8(pb,1); // AVC NALU
447 avio_wb24(pb,pkt->pts - pkt->dts);
450 avio_write(pb, data ? data : pkt->data, size);
452 avio_wb32(pb,size+flags_size+11); // previous tag size
453 flv->duration = FFMAX(flv->duration, pkt->pts + sc->delay + pkt->duration);
462 AVOutputFormat ff_flv_muxer = {
464 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
465 .mime_type = "video/x-flv",
467 .priv_data_size = sizeof(FLVContext),
468 #if CONFIG_LIBMP3LAME
469 .audio_codec = CODEC_ID_MP3,
470 #else // CONFIG_LIBMP3LAME
471 .audio_codec = CODEC_ID_ADPCM_SWF,
472 #endif // CONFIG_LIBMP3LAME
473 .video_codec = CODEC_ID_FLV1,
474 .write_header = flv_write_header,
475 .write_packet = flv_write_packet,
476 .write_trailer = flv_write_trailer,
477 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
478 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,