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[libav.git] / libavformat / flvenc.c
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1/*
2 * FLV encoder.
3 * Copyright (c) 2003 The FFmpeg Project.
4 *
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.
9 *
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.
14 *
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
18 */
19#include "avformat.h"
20
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21#undef NDEBUG
22#include <assert.h>
23
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24typedef struct FLVContext {
25 int hasAudio;
26 int hasVideo;
11a8e425 27 int reserved;
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28} FLVContext;
29
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30static void put_be24(ByteIOContext *pb, int value)
31{
32 put_byte(pb, (value>>16) & 0xFF );
33 put_byte(pb, (value>> 8) & 0xFF );
34 put_byte(pb, (value>> 0) & 0xFF );
35}
36
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37static int get_audio_flags(AVCodecContext *enc){
38 int flags = 0x02;
39
40 switch (enc->sample_rate) {
41 case 44100:
42 flags |= 0x0C;
43 break;
44 case 22050:
45 flags |= 0x08;
46 break;
47 case 11025:
48 flags |= 0x04;
49 break;
50 case 8000: //nellymoser only
51 case 5512: //not mp3
52 flags |= 0x00;
53 break;
54 default:
55 return -1;
56 }
57
58 if (enc->channels > 1) {
59 flags |= 0x01;
60 }
61
62 switch(enc->codec_id){
63 case CODEC_ID_MP3:
64 flags |= 0x20;
65 break;
66 case 0:
67 flags |= enc->codec_tag<<4;
68 break;
69 default:
70 return -1;
71 }
72
73 return flags;
74}
75
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76static int flv_write_header(AVFormatContext *s)
77{
78 ByteIOContext *pb = &s->pb;
79 FLVContext *flv = s->priv_data;
11a8e425 80 int i;
d4f5d74a 81
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82 flv->hasAudio = 0;
83 flv->hasVideo = 0;
84
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85 put_tag(pb,"FLV");
86 put_byte(pb,1);
87 put_byte(pb,0); // delayed write
88 put_be32(pb,9);
89 put_be32(pb,0);
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90
91 for(i=0; i<s->nb_streams; i++){
92 AVCodecContext *enc = &s->streams[i]->codec;
9ee91c2f 93 av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */
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94 if(enc->codec_tag == 5){
95 put_byte(pb,8); // message type
96 put_be24(pb,0); // include flags
97 put_be24(pb,0); // time stamp
98 put_be32(pb,0); // reserved
99 put_be32(pb,11); // size
100 flv->reserved=5;
101 }
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102 if(enc->codec_type == CODEC_TYPE_AUDIO && get_audio_flags(enc)<0)
103 return -1;
11a8e425 104 }
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105
106 return 0;
107}
108
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109static int flv_write_trailer(AVFormatContext *s)
110{
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111 int64_t file_size;
112 int flags = 0;
113
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114 ByteIOContext *pb = &s->pb;
115 FLVContext *flv = s->priv_data;
116
14b32253 117 file_size = url_ftell(pb);
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118 flags |= flv->hasAudio ? 4 : 0;
119 flags |= flv->hasVideo ? 1 : 0;
120 url_fseek(pb, 4, SEEK_SET);
121 put_byte(pb,flags);
122 url_fseek(pb, file_size, SEEK_SET);
123 return 0;
124}
125
e928649b 126static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
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127{
128 ByteIOContext *pb = &s->pb;
e928649b 129 AVCodecContext *enc = &s->streams[pkt->stream_index]->codec;
d4f5d74a 130 FLVContext *flv = s->priv_data;
e928649b 131 int size= pkt->size;
75293f05 132 int flags;
d4f5d74a 133
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134// av_log(s, AV_LOG_DEBUG, "type:%d pts: %lld size:%d\n", enc->codec_type, timestamp, size);
135
d4f5d74a 136 if (enc->codec_type == CODEC_TYPE_VIDEO) {
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137 put_byte(pb, 9);
138 flags = 2; // choose h263
139 flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
d4f5d74a 140 flv->hasVideo = 1;
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141 } else {
142 assert(enc->codec_type == CODEC_TYPE_AUDIO);
37cdf93d 143 flags = get_audio_flags(enc);
068f2a22 144
068f2a22 145 assert(size);
068f2a22 146
75293f05 147 put_byte(pb, 8);
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148
149 // We got audio! Make sure we set this to the global flags on closure
150 flv->hasAudio = 1;
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151 }
152
153 put_be24(pb,size+1); // include flags
154 put_be24(pb,pkt->pts);
155 put_be32(pb,flv->reserved);
156 put_byte(pb,flags);
157 put_buffer(pb, pkt->data, size);
158 put_be32(pb,size+1+11); // reserved
159
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160 put_flush_packet(pb);
161 return 0;
162}
163
164static AVOutputFormat flv_oformat = {
165 "flv",
166 "flv format",
167 "video/x-flashvideo",
168 "flv",
169 sizeof(FLVContext),
170#ifdef CONFIG_MP3LAME
80783dc2 171 CODEC_ID_MP3,
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172#else // CONFIG_MP3LAME
173 CODEC_ID_NONE,
174#endif // CONFIG_MP3LAME
175 CODEC_ID_FLV1,
176 flv_write_header,
177 flv_write_packet,
178 flv_write_trailer,
179};
180
181int flvenc_init(void)
182{
183 av_register_output_format(&flv_oformat);
184 return 0;
185}