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
26 typedef struct FLVContext {
30 offset_t duration_offset;
31 offset_t filesize_offset;
35 static int get_audio_flags(AVCodecContext *enc){
36 int flags = (enc->bits_per_sample == 16) ? 0x2 : 0x0;
38 switch (enc->sample_rate) {
48 case 8000: //nellymoser only
53 av_log(enc, AV_LOG_ERROR, "flv doesnt support that sample rate, choose from (44100, 22050, 11025)\n");
57 if (enc->channels > 1) {
61 switch(enc->codec_id){
67 case CODEC_ID_PCM_S16BE:
70 case CODEC_ID_PCM_S16LE:
73 case CODEC_ID_ADPCM_SWF:
77 flags |= enc->codec_tag<<4;
80 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
91 #define AMF_MIXED_ARRAY 8
95 static void put_amf_string(ByteIOContext *pb, const char *str)
97 size_t len = strlen(str);
99 put_buffer(pb, str, len);
102 static void put_amf_double(ByteIOContext *pb, double d)
104 put_byte(pb, AMF_DOUBLE);
105 put_be64(pb, av_dbl2int(d));
108 static int flv_write_header(AVFormatContext *s)
110 ByteIOContext *pb = &s->pb;
111 FLVContext *flv = s->priv_data;
112 int i, width, height, samplerate;
113 double framerate = 0.0;
114 int metadata_size_pos, data_size;
121 put_byte(pb,0); // delayed write
125 for(i=0; i<s->nb_streams; i++){
126 AVCodecContext *enc = s->streams[i]->codec;
127 if (enc->codec_type == CODEC_TYPE_VIDEO) {
129 height = enc->height;
130 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
131 framerate = av_q2d(s->streams[i]->r_frame_rate);
133 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
138 samplerate = enc->sample_rate;
140 av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */
141 if(enc->codec_tag == 5){
142 put_byte(pb,8); // message type
143 put_be24(pb,0); // include flags
144 put_be24(pb,0); // time stamp
145 put_be32(pb,0); // reserved
146 put_be32(pb,11); // size
149 if(enc->codec_type == CODEC_TYPE_AUDIO && get_audio_flags(enc)<0)
154 put_byte(pb, 18); // tag type META
155 metadata_size_pos= url_ftell(pb);
156 put_be24(pb, 0); // size of data part (sum of all parts below)
157 put_be24(pb, 0); // time stamp
158 put_be32(pb, 0); // reserved
160 /* now data of data_size size */
162 /* first event name as a string */
163 put_byte(pb, AMF_STRING); // 1 byte
164 put_amf_string(pb, "onMetaData"); // 12 bytes
166 /* mixed array (hash) with size and string/type/data tuples */
167 put_byte(pb, AMF_MIXED_ARRAY);
168 put_be32(pb, 4*flv->hasVideo + flv->hasAudio + 2); // +2 for duration and file size
170 put_amf_string(pb, "duration");
171 flv->duration_offset= url_ftell(pb);
172 put_amf_double(pb, 0); // delayed write
175 put_amf_string(pb, "width");
176 put_amf_double(pb, width);
178 put_amf_string(pb, "height");
179 put_amf_double(pb, height);
181 put_amf_string(pb, "videodatarate");
182 put_amf_double(pb, s->bit_rate / 1024.0);
184 put_amf_string(pb, "framerate");
185 put_amf_double(pb, framerate);
189 put_amf_string(pb, "audiosamplerate");
190 put_amf_double(pb, samplerate);
193 put_amf_string(pb, "filesize");
194 flv->filesize_offset= url_ftell(pb);
195 put_amf_double(pb, 0); // delayed write
197 put_amf_string(pb, "");
198 put_byte(pb, 9); // end marker 1 byte
200 /* write total size of tag */
201 data_size= url_ftell(pb) - metadata_size_pos - 10;
202 url_fseek(pb, metadata_size_pos, SEEK_SET);
203 put_be24(pb, data_size);
204 url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
205 put_be32(pb, data_size + 11);
210 static int flv_write_trailer(AVFormatContext *s)
215 ByteIOContext *pb = &s->pb;
216 FLVContext *flv = s->priv_data;
218 file_size = url_ftell(pb);
219 flags |= flv->hasAudio ? 4 : 0;
220 flags |= flv->hasVideo ? 1 : 0;
221 url_fseek(pb, 4, SEEK_SET);
224 /* update informations */
225 url_fseek(pb, flv->duration_offset, SEEK_SET);
226 put_amf_double(pb, flv->duration / (double)1000);
227 url_fseek(pb, flv->filesize_offset, SEEK_SET);
228 put_amf_double(pb, file_size);
230 url_fseek(pb, file_size, SEEK_SET);
234 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
236 ByteIOContext *pb = &s->pb;
237 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
238 FLVContext *flv = s->priv_data;
242 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
244 if (enc->codec_type == CODEC_TYPE_VIDEO) {
246 flags = 2; // choose h263
247 flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
249 assert(enc->codec_type == CODEC_TYPE_AUDIO);
250 flags = get_audio_flags(enc);
257 put_be24(pb,size+1); // include flags
258 put_be24(pb,pkt->pts);
259 put_be32(pb,flv->reserved);
261 put_buffer(pb, pkt->data, size);
262 put_be32(pb,size+1+11); // previous tag size
263 flv->duration = pkt->pts + pkt->duration;
265 put_flush_packet(pb);
269 AVOutputFormat flv_muxer = {
275 #ifdef CONFIG_MP3LAME
277 #else // CONFIG_MP3LAME
279 #endif // CONFIG_MP3LAME