1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* FLV encoder.
* Copyright (c) 2003 The FFmpeg Project.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
static int flv_probe(AVProbeData *p)
{
const uint8_t *d;
if (p->buf_size < 6)
return 0;
d = p->buf;
if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
return 50;
}
return 0;
}
static int flv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
int offset, flags, size;
s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...
url_fskip(&s->pb, 4);
flags = get_byte(&s->pb);
offset = get_be32(&s->pb);
if(!url_is_streamed(&s->pb)){
const int fsize= url_fsize(&s->pb);
url_fseek(&s->pb, fsize-4, SEEK_SET);
size= get_be32(&s->pb);
url_fseek(&s->pb, fsize-3-size, SEEK_SET);
if(size == get_be24(&s->pb) + 11){
s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
}
}
url_fseek(&s->pb, offset, SEEK_SET);
return 0;
}
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, i, type, size, pts, flags, is_audio, next;
AVStream *st = NULL;
for(;;){
url_fskip(&s->pb, 4); /* size of previous packet */
type = get_byte(&s->pb);
size = get_be24(&s->pb);
pts = get_be24(&s->pb);
// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
if (url_feof(&s->pb))
return AVERROR_IO;
url_fskip(&s->pb, 4); /* reserved */
flags = 0;
if(size == 0)
continue;
next= size + url_ftell(&s->pb);
if (type == 8) {
is_audio=1;
flags = get_byte(&s->pb);
} else if (type == 9) {
is_audio=0;
flags = get_byte(&s->pb);
} else if (type == 18 && size > 13+1+4) {
url_fskip(&s->pb, 13); //onMetaData blah
if(get_byte(&s->pb) == 8){
url_fskip(&s->pb, 4);
}
while(url_ftell(&s->pb) + 5 < next){
char tmp[128];
int type, len;
double d= 0;
len= get_be16(&s->pb);
if(len >= sizeof(tmp) || !len)
break;
get_buffer(&s->pb, tmp, len);
tmp[len]=0;
type= get_byte(&s->pb);
if(type==0){
d= av_int2dbl(get_be64(&s->pb));
}else if(type==2){
len= get_be16(&s->pb);
if(len >= sizeof(tmp))
break;
url_fskip(&s->pb, len);
}else if(type==8){
//array
break;
}else if(type==11){
d= av_int2dbl(get_be64(&s->pb));
get_be16(&s->pb);
}
if(!strcmp(tmp, "duration")){
s->duration = d*AV_TIME_BASE;
}else if(!strcmp(tmp, "videodatarate")){
}else if(!strcmp(tmp, "audiodatarate")){
}
}
url_fseek(&s->pb, next, SEEK_SET);
continue;
} else {
/* skip packet */
av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
url_fseek(&s->pb, next, SEEK_SET);
continue;
}
/* now find stream */
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
if (st->id == is_audio)
break;
}
if(i == s->nb_streams){
st = av_new_stream(s, is_audio);
if (!st)
return AVERROR_NOMEM;
av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
st->codec->time_base= (AVRational){1,1000};
}
// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
if( (st->discard >= AVDISCARD_NONKEY && !((flags >> 4)==1 || is_audio))
||(st->discard >= AVDISCARD_BIDIR && ((flags >> 4)==3 && !is_audio))
|| st->discard >= AVDISCARD_ALL
){
url_fseek(&s->pb, next, SEEK_SET);
continue;
}
break;
}
if(is_audio){
if(st->codec->sample_rate == 0){
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->channels = (flags&1)+1;
if((flags >> 4) == 5)
st->codec->sample_rate= 8000;
else
st->codec->sample_rate = (44100<<((flags>>2)&3))>>3;
switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
case 0: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16BE;
else st->codec->codec_id = CODEC_ID_PCM_S8; break;
case 1: st->codec->codec_id = CODEC_ID_ADPCM_SWF; break;
case 2: st->codec->codec_id = CODEC_ID_MP3; break;
// this is not listed at FLV but at SWF, strange...
case 3: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16LE;
else st->codec->codec_id = CODEC_ID_PCM_S8; break;
default:
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
st->codec->codec_tag= (flags >> 4);
}
st->codec->bits_per_sample = (flags & 2) ? 16 : 8;
}
}else{
st->codec->codec_type = CODEC_TYPE_VIDEO;
switch(flags & 0xF){
case 2: st->codec->codec_id = CODEC_ID_FLV1; break;
case 3: st->codec->codec_id = CODEC_ID_FLASHSV; break;
default:
av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & 0xf);
st->codec->codec_tag= flags & 0xF;
}
}
ret= av_get_packet(&s->pb, pkt, size - 1);
if (ret <= 0) {
return AVERROR_IO;
}
/* note: we need to modify the packet size here to handle the last
packet */
pkt->size = ret;
pkt->pts = pts;
pkt->stream_index = st->index;
if (is_audio || ((flags >> 4)==1))
pkt->flags |= PKT_FLAG_KEY;
return ret;
}
static int flv_read_close(AVFormatContext *s)
{
return 0;
}
AVInputFormat flv_demuxer = {
"flv",
"flv format",
0,
flv_probe,
flv_read_header,
flv_read_packet,
flv_read_close,
.extensions = "flv",
.value = CODEC_ID_FLV1,
};
|
