3 * Copyright (c) 2003 The FFmpeg Project.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 typedef struct FLVContext {
30 static void put_be24(ByteIOContext *pb, int value)
32 put_byte(pb, (value>>16) & 0xFF );
33 put_byte(pb, (value>> 8) & 0xFF );
34 put_byte(pb, (value>> 0) & 0xFF );
37 static int get_audio_flags(AVCodecContext *enc){
38 int flags = (enc->bits_per_sample == 16) ? 0x2 : 0x0;
40 switch (enc->sample_rate) {
50 case 8000: //nellymoser only
58 if (enc->channels > 1) {
62 switch(enc->codec_id){
68 case CODEC_ID_PCM_S16BE:
71 case CODEC_ID_PCM_S16LE:
75 flags |= enc->codec_tag<<4;
84 static int flv_write_header(AVFormatContext *s)
86 ByteIOContext *pb = &s->pb;
87 FLVContext *flv = s->priv_data;
95 put_byte(pb,0); // delayed write
99 for(i=0; i<s->nb_streams; i++){
100 AVCodecContext *enc = &s->streams[i]->codec;
101 av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */
102 if(enc->codec_tag == 5){
103 put_byte(pb,8); // message type
104 put_be24(pb,0); // include flags
105 put_be24(pb,0); // time stamp
106 put_be32(pb,0); // reserved
107 put_be32(pb,11); // size
110 if(enc->codec_type == CODEC_TYPE_AUDIO && get_audio_flags(enc)<0)
117 static int flv_write_trailer(AVFormatContext *s)
122 ByteIOContext *pb = &s->pb;
123 FLVContext *flv = s->priv_data;
125 file_size = url_ftell(pb);
126 flags |= flv->hasAudio ? 4 : 0;
127 flags |= flv->hasVideo ? 1 : 0;
128 url_fseek(pb, 4, SEEK_SET);
130 url_fseek(pb, file_size, SEEK_SET);
134 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
136 ByteIOContext *pb = &s->pb;
137 AVCodecContext *enc = &s->streams[pkt->stream_index]->codec;
138 FLVContext *flv = s->priv_data;
142 // av_log(s, AV_LOG_DEBUG, "type:%d pts: %lld size:%d\n", enc->codec_type, timestamp, size);
144 if (enc->codec_type == CODEC_TYPE_VIDEO) {
146 flags = 2; // choose h263
147 flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
150 assert(enc->codec_type == CODEC_TYPE_AUDIO);
151 flags = get_audio_flags(enc);
157 // We got audio! Make sure we set this to the global flags on closure
161 put_be24(pb,size+1); // include flags
162 put_be24(pb,pkt->pts);
163 put_be32(pb,flv->reserved);
165 put_buffer(pb, pkt->data, size);
166 put_be32(pb,size+1+11); // previous tag size
168 put_flush_packet(pb);
172 static AVOutputFormat flv_oformat = {
175 "video/x-flashvideo",
178 #ifdef CONFIG_MP3LAME
180 #else // CONFIG_MP3LAME
182 #endif // CONFIG_MP3LAME
189 int flvenc_init(void)
191 av_register_output_format(&flv_oformat);