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"
23 #include "libavutil/intfloat_readwrite.h"
29 #include "libavutil/dict.h"
34 static const AVCodecTag flv_video_codec_ids[] = {
35 {CODEC_ID_FLV1, FLV_CODECID_H263 },
36 {CODEC_ID_H263, FLV_CODECID_REALH263},
37 {CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
38 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
39 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
40 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
41 {CODEC_ID_VP6, FLV_CODECID_VP6 },
42 {CODEC_ID_H264, FLV_CODECID_H264 },
46 static const AVCodecTag flv_audio_codec_ids[] = {
47 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
48 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
49 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
50 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
51 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
52 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
53 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
54 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
58 typedef struct FLVContext {
60 int64_t duration_offset;
61 int64_t filesize_offset;
63 int delay; ///< first dts delay for AVC
64 int64_t last_video_ts;
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 if (enc->frame_size / 320 > 8) {
82 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
83 "8 frames per packet. Adobe Flash "
84 "Player cannot handle this!\n");
86 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
88 switch (enc->sample_rate) {
90 flags |= FLV_SAMPLERATE_44100HZ;
93 flags |= FLV_SAMPLERATE_22050HZ;
96 flags |= FLV_SAMPLERATE_11025HZ;
98 case 8000: //nellymoser only
100 if(enc->codec_id != CODEC_ID_MP3){
101 flags |= FLV_SAMPLERATE_SPECIAL;
105 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
110 if (enc->channels > 1) {
114 switch(enc->codec_id){
116 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
118 case CODEC_ID_PCM_U8:
119 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
121 case CODEC_ID_PCM_S16BE:
122 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
124 case CODEC_ID_PCM_S16LE:
125 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
127 case CODEC_ID_ADPCM_SWF:
128 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
130 case CODEC_ID_NELLYMOSER:
131 if (enc->sample_rate == 8000) {
132 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
134 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
138 flags |= enc->codec_tag<<4;
141 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
148 static void put_amf_string(AVIOContext *pb, const char *str)
150 size_t len = strlen(str);
152 avio_write(pb, str, len);
155 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
156 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
157 avio_wb24(pb, 5); /* Tag Data Size */
158 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
159 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
160 avio_wb24(pb, 0); /* StreamId = 0 */
161 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
162 avio_w8(pb, 2); /* AVC end of sequence */
163 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
164 avio_wb32(pb, 16); /* Size of FLV tag */
167 static void put_amf_double(AVIOContext *pb, double d)
169 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
170 avio_wb64(pb, av_dbl2int(d));
173 static void put_amf_bool(AVIOContext *pb, int b) {
174 avio_w8(pb, AMF_DATA_TYPE_BOOL);
178 static int flv_write_header(AVFormatContext *s)
180 AVIOContext *pb = s->pb;
181 FLVContext *flv = s->priv_data;
182 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
184 double framerate = 0.0;
185 int64_t metadata_size_pos, data_size;
186 AVDictionaryEntry *tag = NULL;
188 for(i=0; i<s->nb_streams; i++){
189 AVCodecContext *enc = s->streams[i]->codec;
190 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
191 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
192 framerate = av_q2d(s->streams[i]->r_frame_rate);
194 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
197 if(enc->codec_tag == 0) {
198 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
201 } else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
203 if(get_audio_flags(enc)<0)
206 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
208 avio_write(pb, "FLV", 3);
210 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
211 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
215 for(i=0; i<s->nb_streams; i++){
216 if(s->streams[i]->codec->codec_tag == 5){
217 avio_w8(pb,8); // message type
218 avio_wb24(pb,0); // include flags
219 avio_wb24(pb,0); // time stamp
220 avio_wb32(pb,0); // reserved
221 avio_wb32(pb,11); // size
226 flv->last_video_ts = -1;
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 avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
245 put_amf_string(pb, "duration");
246 flv->duration_offset= avio_tell(pb);
247 put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
250 put_amf_string(pb, "width");
251 put_amf_double(pb, video_enc->width);
253 put_amf_string(pb, "height");
254 put_amf_double(pb, video_enc->height);
256 put_amf_string(pb, "videodatarate");
257 put_amf_double(pb, video_enc->bit_rate / 1024.0);
259 put_amf_string(pb, "framerate");
260 put_amf_double(pb, framerate);
262 put_amf_string(pb, "videocodecid");
263 put_amf_double(pb, video_enc->codec_tag);
267 put_amf_string(pb, "audiodatarate");
268 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
270 put_amf_string(pb, "audiosamplerate");
271 put_amf_double(pb, audio_enc->sample_rate);
273 put_amf_string(pb, "audiosamplesize");
274 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
276 put_amf_string(pb, "stereo");
277 put_amf_bool(pb, audio_enc->channels == 2);
279 put_amf_string(pb, "audiocodecid");
280 put_amf_double(pb, audio_enc->codec_tag);
283 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
284 put_amf_string(pb, tag->key);
285 avio_w8(pb, AMF_DATA_TYPE_STRING);
286 put_amf_string(pb, tag->value);
289 put_amf_string(pb, "filesize");
290 flv->filesize_offset= avio_tell(pb);
291 put_amf_double(pb, 0); // delayed write
293 put_amf_string(pb, "");
294 avio_w8(pb, AMF_END_OF_OBJECT);
296 /* write total size of tag */
297 data_size= avio_tell(pb) - metadata_size_pos - 10;
298 avio_seek(pb, metadata_size_pos, SEEK_SET);
299 avio_wb24(pb, data_size);
300 avio_skip(pb, data_size + 10 - 3);
301 avio_wb32(pb, data_size + 11);
303 for (i = 0; i < s->nb_streams; i++) {
304 AVCodecContext *enc = s->streams[i]->codec;
305 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
307 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
308 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
309 avio_wb24(pb, 0); // size patched later
310 avio_wb24(pb, 0); // ts
311 avio_w8(pb, 0); // ts ext
312 avio_wb24(pb, 0); // streamid
314 if (enc->codec_id == CODEC_ID_AAC) {
315 avio_w8(pb, get_audio_flags(enc));
316 avio_w8(pb, 0); // AAC sequence header
317 avio_write(pb, enc->extradata, enc->extradata_size);
319 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
320 avio_w8(pb, 0); // AVC sequence header
321 avio_wb24(pb, 0); // composition time
322 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
324 data_size = avio_tell(pb) - pos;
325 avio_seek(pb, -data_size - 10, SEEK_CUR);
326 avio_wb24(pb, data_size);
327 avio_skip(pb, data_size + 10 - 3);
328 avio_wb32(pb, data_size + 11); // previous tag size
335 static int flv_write_trailer(AVFormatContext *s)
339 AVIOContext *pb = s->pb;
340 FLVContext *flv = s->priv_data;
344 for (i = 0; i < s->nb_streams; i++) {
345 AVCodecContext *enc = s->streams[i]->codec;
346 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
347 (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)) {
348 put_avc_eos_tag(pb, flv->last_video_ts);
352 file_size = avio_tell(pb);
354 /* update informations */
355 avio_seek(pb, flv->duration_offset, SEEK_SET);
356 put_amf_double(pb, flv->duration / (double)1000);
357 avio_seek(pb, flv->filesize_offset, SEEK_SET);
358 put_amf_double(pb, file_size);
360 avio_seek(pb, file_size, SEEK_SET);
364 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
366 AVIOContext *pb = s->pb;
367 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
368 FLVContext *flv = s->priv_data;
372 int flags, flags_size;
374 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
376 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
377 enc->codec_id == CODEC_ID_AAC)
379 else if(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)
384 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
385 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
387 flags = enc->codec_tag;
389 av_log(enc, AV_LOG_ERROR, "video codec %s not compatible with flv\n", avcodec_get_name(enc->codec_id));
393 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
394 } else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
395 flags = get_audio_flags(enc);
399 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
401 // In-band flv metadata ("scriptdata")
402 assert(enc->codec_type == AVMEDIA_TYPE_DATA);
403 avio_w8(pb, FLV_TAG_TYPE_META);
408 if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
409 /* check if extradata looks like mp4 formated */
410 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
411 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
414 if (!flv->delay && pkt->dts < 0)
415 flv->delay = -pkt->dts;
416 } else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
417 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
418 av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
422 ts = pkt->dts + flv->delay; // add delay to force positive dts
423 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
424 if (flv->last_video_ts < ts)
425 flv->last_video_ts = ts;
427 avio_wb24(pb,size + flags_size);
429 avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
430 avio_wb24(pb,flv->reserved);
435 if (enc->codec_id == CODEC_ID_VP6)
437 if (enc->codec_id == CODEC_ID_VP6F)
438 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
439 else if (enc->codec_id == CODEC_ID_AAC)
440 avio_w8(pb,1); // AAC raw
441 else if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
442 avio_w8(pb,1); // AVC NALU
443 avio_wb24(pb,pkt->pts - pkt->dts);
446 avio_write(pb, data ? data : pkt->data, size);
448 avio_wb32(pb,size+flags_size+11); // previous tag size
449 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
458 AVOutputFormat ff_flv_muxer = {
460 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
461 .mime_type = "video/x-flv",
463 .priv_data_size = sizeof(FLVContext),
464 #if CONFIG_LIBMP3LAME
465 .audio_codec = CODEC_ID_MP3,
466 #else // CONFIG_LIBMP3LAME
467 .audio_codec = CODEC_ID_ADPCM_SWF,
468 #endif // CONFIG_LIBMP3LAME
469 .video_codec = CODEC_ID_FLV1,
470 .write_header = flv_write_header,
471 .write_packet = flv_write_packet,
472 .write_trailer = flv_write_trailer,
473 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
474 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,