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