1f0ea5cbcfbebbeac794f868367d0427bf6eddd5
[libav.git] / libavformat / flvenc.c
1 /*
2 * FLV muxer
3 * Copyright (c) 2003 The FFmpeg Project
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21 #include "avformat.h"
22 #include "flv.h"
23 #include "riff.h"
24 #include "avc.h"
25
26 #undef NDEBUG
27 #include <assert.h>
28
29 static const AVCodecTag flv_video_codec_ids[] = {
30 {CODEC_ID_FLV1, FLV_CODECID_H263 },
31 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
32 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
33 {CODEC_ID_VP6, FLV_CODECID_VP6 },
34 {CODEC_ID_H264, FLV_CODECID_H264 },
35 {CODEC_ID_NONE, 0}
36 };
37
38 static const AVCodecTag flv_audio_codec_ids[] = {
39 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
40 {CODEC_ID_PCM_S8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
41 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
42 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
43 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
44 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
45 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
46 {CODEC_ID_NONE, 0}
47 };
48
49 typedef struct FLVContext {
50 int reserved;
51 int64_t duration_offset;
52 int64_t filesize_offset;
53 int64_t duration;
54 int delay; ///< first dts delay for AVC
55 } FLVContext;
56
57 static int get_audio_flags(AVCodecContext *enc){
58 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
59
60 if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
61 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
62 else {
63 switch (enc->sample_rate) {
64 case 44100:
65 flags |= FLV_SAMPLERATE_44100HZ;
66 break;
67 case 22050:
68 flags |= FLV_SAMPLERATE_22050HZ;
69 break;
70 case 11025:
71 flags |= FLV_SAMPLERATE_11025HZ;
72 break;
73 case 8000: //nellymoser only
74 case 5512: //not mp3
75 if(enc->codec_id != CODEC_ID_MP3){
76 flags |= FLV_SAMPLERATE_SPECIAL;
77 break;
78 }
79 default:
80 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
81 return -1;
82 }
83 }
84
85 if (enc->channels > 1) {
86 flags |= FLV_STEREO;
87 }
88
89 switch(enc->codec_id){
90 case CODEC_ID_MP3:
91 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
92 break;
93 case CODEC_ID_PCM_S8:
94 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
95 break;
96 case CODEC_ID_PCM_S16BE:
97 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
98 break;
99 case CODEC_ID_PCM_S16LE:
100 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
101 break;
102 case CODEC_ID_ADPCM_SWF:
103 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
104 break;
105 case CODEC_ID_NELLYMOSER:
106 if (enc->sample_rate == 8000) {
107 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
108 } else {
109 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
110 }
111 break;
112 case 0:
113 flags |= enc->codec_tag<<4;
114 break;
115 default:
116 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
117 return -1;
118 }
119
120 return flags;
121 }
122
123 static void put_amf_string(ByteIOContext *pb, const char *str)
124 {
125 size_t len = strlen(str);
126 put_be16(pb, len);
127 put_buffer(pb, str, len);
128 }
129
130 static void put_amf_double(ByteIOContext *pb, double d)
131 {
132 put_byte(pb, AMF_DATA_TYPE_NUMBER);
133 put_be64(pb, av_dbl2int(d));
134 }
135
136 static void put_amf_bool(ByteIOContext *pb, int b) {
137 put_byte(pb, AMF_DATA_TYPE_BOOL);
138 put_byte(pb, !!b);
139 }
140
141 static int flv_write_header(AVFormatContext *s)
142 {
143 ByteIOContext *pb = s->pb;
144 FLVContext *flv = s->priv_data;
145 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
146 int i;
147 double framerate = 0.0;
148 int metadata_size_pos, data_size;
149
150 for(i=0; i<s->nb_streams; i++){
151 AVCodecContext *enc = s->streams[i]->codec;
152 if (enc->codec_type == CODEC_TYPE_VIDEO) {
153 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
154 framerate = av_q2d(s->streams[i]->r_frame_rate);
155 } else {
156 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
157 }
158 video_enc = enc;
159 if(enc->codec_tag == 0) {
160 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
161 return -1;
162 }
163 } else {
164 audio_enc = enc;
165 if(get_audio_flags(enc)<0)
166 return -1;
167 }
168 av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
169 }
170 put_tag(pb,"FLV");
171 put_byte(pb,1);
172 put_byte(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
173 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
174 put_be32(pb,9);
175 put_be32(pb,0);
176
177 for(i=0; i<s->nb_streams; i++){
178 if(s->streams[i]->codec->codec_tag == 5){
179 put_byte(pb,8); // message type
180 put_be24(pb,0); // include flags
181 put_be24(pb,0); // time stamp
182 put_be32(pb,0); // reserved
183 put_be32(pb,11); // size
184 flv->reserved=5;
185 }
186 }
187
188 /* write meta_tag */
189 put_byte(pb, 18); // tag type META
190 metadata_size_pos= url_ftell(pb);
191 put_be24(pb, 0); // size of data part (sum of all parts below)
192 put_be24(pb, 0); // time stamp
193 put_be32(pb, 0); // reserved
194
195 /* now data of data_size size */
196
197 /* first event name as a string */
198 put_byte(pb, AMF_DATA_TYPE_STRING);
199 put_amf_string(pb, "onMetaData"); // 12 bytes
200
201 /* mixed array (hash) with size and string/type/data tuples */
202 put_byte(pb, AMF_DATA_TYPE_MIXEDARRAY);
203 put_be32(pb, 5*!!video_enc + 4*!!audio_enc + 2); // +2 for duration and file size
204
205 put_amf_string(pb, "duration");
206 flv->duration_offset= url_ftell(pb);
207 put_amf_double(pb, 0); // delayed write
208
209 if(video_enc){
210 put_amf_string(pb, "width");
211 put_amf_double(pb, video_enc->width);
212
213 put_amf_string(pb, "height");
214 put_amf_double(pb, video_enc->height);
215
216 put_amf_string(pb, "videodatarate");
217 put_amf_double(pb, s->bit_rate / 1024.0);
218
219 put_amf_string(pb, "framerate");
220 put_amf_double(pb, framerate);
221
222 put_amf_string(pb, "videocodecid");
223 put_amf_double(pb, video_enc->codec_tag);
224 }
225
226 if(audio_enc){
227 put_amf_string(pb, "audiosamplerate");
228 put_amf_double(pb, audio_enc->sample_rate);
229
230 put_amf_string(pb, "audiosamplesize");
231 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_S8 ? 8 : 16);
232
233 put_amf_string(pb, "stereo");
234 put_amf_bool(pb, audio_enc->channels == 2);
235
236 put_amf_string(pb, "audiocodecid");
237 put_amf_double(pb, audio_enc->codec_tag);
238 }
239
240 put_amf_string(pb, "filesize");
241 flv->filesize_offset= url_ftell(pb);
242 put_amf_double(pb, 0); // delayed write
243
244 put_amf_string(pb, "");
245 put_byte(pb, AMF_END_OF_OBJECT);
246
247 /* write total size of tag */
248 data_size= url_ftell(pb) - metadata_size_pos - 10;
249 url_fseek(pb, metadata_size_pos, SEEK_SET);
250 put_be24(pb, data_size);
251 url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
252 put_be32(pb, data_size + 11);
253
254 for (i = 0; i < s->nb_streams; i++) {
255 AVCodecContext *enc = s->streams[i]->codec;
256 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
257 int64_t pos;
258 put_byte(pb, enc->codec_type == CODEC_TYPE_VIDEO ?
259 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
260 put_be24(pb, 0); // size patched later
261 put_be24(pb, 0); // ts
262 put_byte(pb, 0); // ts ext
263 put_be24(pb, 0); // streamid
264 pos = url_ftell(pb);
265 if (enc->codec_id == CODEC_ID_AAC) {
266 put_byte(pb, get_audio_flags(enc));
267 put_byte(pb, 0); // AAC sequence header
268 put_buffer(pb, enc->extradata, enc->extradata_size);
269 } else {
270 put_byte(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
271 put_byte(pb, 0); // AVC sequence header
272 put_be24(pb, 0); // composition time
273 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
274 }
275 data_size = url_ftell(pb) - pos;
276 url_fseek(pb, -data_size - 10, SEEK_CUR);
277 put_be24(pb, data_size);
278 url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
279 put_be32(pb, data_size + 11); // previous tag size
280 }
281 }
282
283 return 0;
284 }
285
286 static int flv_write_trailer(AVFormatContext *s)
287 {
288 int64_t file_size;
289
290 ByteIOContext *pb = s->pb;
291 FLVContext *flv = s->priv_data;
292
293 file_size = url_ftell(pb);
294
295 /* update informations */
296 url_fseek(pb, flv->duration_offset, SEEK_SET);
297 put_amf_double(pb, flv->duration / (double)1000);
298 url_fseek(pb, flv->filesize_offset, SEEK_SET);
299 put_amf_double(pb, file_size);
300
301 url_fseek(pb, file_size, SEEK_SET);
302 return 0;
303 }
304
305 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
306 {
307 ByteIOContext *pb = s->pb;
308 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
309 FLVContext *flv = s->priv_data;
310 unsigned ts;
311 int size= pkt->size;
312 uint8_t *data= NULL;
313 int flags, flags_size;
314
315 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
316
317 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
318 enc->codec_id == CODEC_ID_AAC)
319 flags_size= 2;
320 else if(enc->codec_id == CODEC_ID_H264)
321 flags_size= 5;
322 else
323 flags_size= 1;
324
325 if (enc->codec_type == CODEC_TYPE_VIDEO) {
326 put_byte(pb, FLV_TAG_TYPE_VIDEO);
327
328 flags = enc->codec_tag;
329 if(flags == 0) {
330 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
331 return -1;
332 }
333
334 flags |= pkt->flags & PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
335 } else {
336 assert(enc->codec_type == CODEC_TYPE_AUDIO);
337 flags = get_audio_flags(enc);
338
339 assert(size);
340
341 put_byte(pb, FLV_TAG_TYPE_AUDIO);
342 }
343
344 if (enc->codec_id == CODEC_ID_H264) {
345 /* check if extradata looks like mp4 formated */
346 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
347 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
348 return -1;
349 }
350 if (!flv->delay && pkt->dts < 0)
351 flv->delay = -pkt->dts;
352 }
353
354 ts = pkt->dts + flv->delay; // add delay to force positive dts
355 put_be24(pb,size + flags_size);
356 put_be24(pb,ts);
357 put_byte(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
358 put_be24(pb,flv->reserved);
359 put_byte(pb,flags);
360 if (enc->codec_id == CODEC_ID_VP6)
361 put_byte(pb,0);
362 if (enc->codec_id == CODEC_ID_VP6F)
363 put_byte(pb, enc->extradata_size ? enc->extradata[0] : 0);
364 else if (enc->codec_id == CODEC_ID_AAC)
365 put_byte(pb,1); // AAC raw
366 else if (enc->codec_id == CODEC_ID_H264) {
367 put_byte(pb,1); // AVC NALU
368 put_be24(pb,pkt->pts - pkt->dts);
369 }
370
371 put_buffer(pb, data ? data : pkt->data, size);
372
373 put_be32(pb,size+flags_size+11); // previous tag size
374 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
375
376 put_flush_packet(pb);
377
378 av_free(data);
379
380 return 0;
381 }
382
383 AVOutputFormat flv_muxer = {
384 "flv",
385 NULL_IF_CONFIG_SMALL("FLV format"),
386 "video/x-flv",
387 "flv",
388 sizeof(FLVContext),
389 #if CONFIG_LIBMP3LAME
390 CODEC_ID_MP3,
391 #else // CONFIG_LIBMP3LAME
392 CODEC_ID_ADPCM_SWF,
393 #endif // CONFIG_LIBMP3LAME
394 CODEC_ID_FLV1,
395 flv_write_header,
396 flv_write_packet,
397 flv_write_trailer,
398 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
399 .flags= AVFMT_GLOBALHEADER,
400 };