line |
stmt |
bran |
cond |
sub |
pod |
time |
code |
1
|
|
|
|
|
|
|
package Net::RTP::Packet; |
2
|
|
|
|
|
|
|
|
3
|
|
|
|
|
|
|
################ |
4
|
|
|
|
|
|
|
# |
5
|
|
|
|
|
|
|
# Net::RTP::Packet: Pure Perl RTP Packet object (RFC3550) |
6
|
|
|
|
|
|
|
# |
7
|
|
|
|
|
|
|
# Nicholas J Humfrey, njh@cpan.org |
8
|
|
|
|
|
|
|
# |
9
|
|
|
|
|
|
|
|
10
|
3
|
|
|
3
|
|
52813
|
use strict; |
|
3
|
|
|
|
|
7
|
|
|
3
|
|
|
|
|
113
|
|
11
|
3
|
|
|
3
|
|
18
|
use Carp; |
|
3
|
|
|
|
|
6
|
|
|
3
|
|
|
|
|
199
|
|
12
|
|
|
|
|
|
|
|
13
|
3
|
|
|
3
|
|
35
|
use vars qw/$VERSION/; |
|
3
|
|
|
|
|
4
|
|
|
3
|
|
|
|
|
5667
|
|
14
|
|
|
|
|
|
|
$VERSION="0.05"; |
15
|
|
|
|
|
|
|
|
16
|
|
|
|
|
|
|
|
17
|
|
|
|
|
|
|
# Seed a random number for old versions of perl |
18
|
|
|
|
|
|
|
if ($] < 5.004) { |
19
|
|
|
|
|
|
|
srand(time ^ ($$ + ($$ << 15))); |
20
|
|
|
|
|
|
|
} |
21
|
|
|
|
|
|
|
|
22
|
|
|
|
|
|
|
|
23
|
|
|
|
|
|
|
sub new { |
24
|
4
|
|
|
4
|
1
|
667
|
my $class = shift; |
25
|
4
|
|
|
|
|
11
|
my ($bindata) = @_; |
26
|
|
|
|
|
|
|
|
27
|
|
|
|
|
|
|
# Store parameters |
28
|
4
|
|
|
|
|
62
|
my $self = { |
29
|
|
|
|
|
|
|
version => 2, |
30
|
|
|
|
|
|
|
padding => 0, |
31
|
|
|
|
|
|
|
extension => 0, |
32
|
|
|
|
|
|
|
marker => 0, |
33
|
|
|
|
|
|
|
payload_type => 0, |
34
|
|
|
|
|
|
|
seq_num => 0, |
35
|
|
|
|
|
|
|
timestamp => 0, |
36
|
|
|
|
|
|
|
ssrc => 0, |
37
|
|
|
|
|
|
|
csrc => [], |
38
|
|
|
|
|
|
|
payload => '', |
39
|
|
|
|
|
|
|
size => undef, |
40
|
|
|
|
|
|
|
source_ip => undef, |
41
|
|
|
|
|
|
|
source_port => undef, |
42
|
|
|
|
|
|
|
}; |
43
|
4
|
|
|
|
|
13
|
bless $self, $class; |
44
|
|
|
|
|
|
|
|
45
|
|
|
|
|
|
|
|
46
|
|
|
|
|
|
|
# Decode binary packet? |
47
|
4
|
100
|
|
|
|
17
|
if (defined $bindata) { |
48
|
1
|
|
|
|
|
6
|
$self->decode( $bindata ); |
49
|
|
|
|
|
|
|
} else { |
50
|
|
|
|
|
|
|
# Randomise sequence, timestamp and SSRC |
51
|
3
|
|
|
|
|
134
|
$self->{'seq_num'} = int(rand(2**16)); |
52
|
3
|
|
|
|
|
9
|
$self->{'timestamp'} = int(rand(2**32)); |
53
|
3
|
|
|
|
|
7
|
$self->{'ssrc'} = int(rand(2**32)); |
54
|
|
|
|
|
|
|
} |
55
|
|
|
|
|
|
|
|
56
|
4
|
|
|
|
|
14
|
return $self; |
57
|
|
|
|
|
|
|
} |
58
|
|
|
|
|
|
|
|
59
|
|
|
|
|
|
|
|
60
|
|
|
|
|
|
|
sub version { |
61
|
1
|
|
|
1
|
1
|
418
|
my $self = shift; |
62
|
1
|
|
|
|
|
3
|
my ($version) = @_; |
63
|
1
|
50
|
|
|
|
4
|
$self->{'version'} = $version if (defined $version); |
64
|
1
|
|
|
|
|
5
|
return $self->{'version'}; |
65
|
|
|
|
|
|
|
} |
66
|
|
|
|
|
|
|
|
67
|
|
|
|
|
|
|
sub padding { |
68
|
2
|
|
|
2
|
1
|
8
|
my $self = shift; |
69
|
2
|
|
|
|
|
4
|
my ($padding) = @_; |
70
|
2
|
100
|
|
|
|
7
|
$self->{'padding'} = $padding if (defined $padding); |
71
|
2
|
|
|
|
|
12
|
return $self->{'padding'}; |
72
|
|
|
|
|
|
|
} |
73
|
|
|
|
|
|
|
|
74
|
|
|
|
|
|
|
sub extension { |
75
|
1
|
|
|
1
|
1
|
2
|
my $self = shift; |
76
|
1
|
|
|
|
|
5
|
return $self->{'extension'}; |
77
|
|
|
|
|
|
|
} |
78
|
|
|
|
|
|
|
|
79
|
|
|
|
|
|
|
sub marker { |
80
|
2
|
|
|
2
|
1
|
5
|
my $self = shift; |
81
|
2
|
|
|
|
|
4
|
my ($marker) = @_; |
82
|
2
|
100
|
|
|
|
38
|
$self->{'marker'} = $marker if (defined $marker); |
83
|
2
|
|
|
|
|
9
|
return $self->{'marker'}; |
84
|
|
|
|
|
|
|
} |
85
|
|
|
|
|
|
|
|
86
|
|
|
|
|
|
|
sub payload_type { |
87
|
3
|
|
|
3
|
1
|
12
|
my $self = shift; |
88
|
3
|
|
|
|
|
29
|
my ($payload_type) = @_; |
89
|
3
|
100
|
|
|
|
12
|
$self->{'payload_type'} = $payload_type if (defined $payload_type); |
90
|
3
|
|
|
|
|
16
|
return $self->{'payload_type'}; |
91
|
|
|
|
|
|
|
} |
92
|
|
|
|
|
|
|
|
93
|
|
|
|
|
|
|
sub seq_num { |
94
|
4
|
|
|
4
|
1
|
10
|
my $self = shift; |
95
|
4
|
|
|
|
|
8
|
my ($seq_num) = @_; |
96
|
4
|
100
|
|
|
|
11
|
$self->{'seq_num'} = $seq_num if (defined $seq_num); |
97
|
4
|
|
|
|
|
17
|
return $self->{'seq_num'}; |
98
|
|
|
|
|
|
|
} |
99
|
|
|
|
|
|
|
|
100
|
|
|
|
|
|
|
sub seq_num_increment { |
101
|
1
|
|
|
1
|
1
|
6
|
my $self = shift; |
102
|
|
|
|
|
|
|
|
103
|
1
|
|
|
|
|
1
|
my ($value) = @_; |
104
|
1
|
50
|
|
|
|
6
|
$value = 1 unless (defined $value); |
105
|
1
|
|
|
|
|
3
|
$self->{'seq_num'} += $value; |
106
|
|
|
|
|
|
|
|
107
|
1
|
|
|
|
|
5
|
return $self->{'seq_num'}; |
108
|
|
|
|
|
|
|
} |
109
|
|
|
|
|
|
|
|
110
|
|
|
|
|
|
|
sub timestamp { |
111
|
4
|
|
|
4
|
1
|
8
|
my $self = shift; |
112
|
4
|
|
|
|
|
10
|
my ($timestamp) = @_; |
113
|
4
|
100
|
|
|
|
14
|
$self->{'timestamp'} = $timestamp if (defined $timestamp); |
114
|
4
|
|
|
|
|
19
|
return $self->{'timestamp'}; |
115
|
|
|
|
|
|
|
} |
116
|
|
|
|
|
|
|
|
117
|
|
|
|
|
|
|
sub timestamp_increment { |
118
|
1
|
|
|
1
|
1
|
8
|
my $self = shift; |
119
|
|
|
|
|
|
|
|
120
|
1
|
|
|
|
|
2
|
my ($value) = @_; |
121
|
1
|
50
|
|
|
|
17
|
$value = 1 unless (defined $value); |
122
|
1
|
|
|
|
|
3
|
$self->{'timestamp'} += $value; |
123
|
|
|
|
|
|
|
|
124
|
1
|
|
|
|
|
14
|
return $self->{'timestamp'}; |
125
|
|
|
|
|
|
|
} |
126
|
|
|
|
|
|
|
|
127
|
|
|
|
|
|
|
sub ssrc { |
128
|
3
|
|
|
3
|
1
|
7
|
my $self = shift; |
129
|
3
|
|
|
|
|
5
|
my ($ssrc) = @_; |
130
|
3
|
100
|
|
|
|
17
|
$self->{'ssrc'} = $ssrc if (defined $ssrc); |
131
|
3
|
|
|
|
|
16
|
return $self->{'ssrc'}; |
132
|
|
|
|
|
|
|
} |
133
|
|
|
|
|
|
|
|
134
|
|
|
|
|
|
|
sub csrc { |
135
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
136
|
0
|
|
|
|
|
0
|
my ($csrc) = @_; |
137
|
0
|
0
|
|
|
|
0
|
if (defined $csrc) { |
138
|
0
|
0
|
|
|
|
0
|
if (ref($csrc) ne 'ARRAY') { |
139
|
0
|
|
|
|
|
0
|
carp "CSRC should be an ARRAYREF"; |
140
|
|
|
|
|
|
|
} else { |
141
|
0
|
|
|
|
|
0
|
$self->{'csrc'} = $csrc ; |
142
|
|
|
|
|
|
|
} |
143
|
|
|
|
|
|
|
} |
144
|
0
|
|
|
|
|
0
|
return $self->{'csrc'}; |
145
|
|
|
|
|
|
|
} |
146
|
|
|
|
|
|
|
|
147
|
|
|
|
|
|
|
sub payload { |
148
|
3
|
|
|
3
|
1
|
8
|
my $self = shift; |
149
|
3
|
|
|
|
|
7
|
my ($payload) = @_; |
150
|
3
|
100
|
|
|
|
11
|
$self->{'payload'} = $payload if (defined $payload); |
151
|
3
|
|
|
|
|
17
|
return $self->{'payload'}; |
152
|
|
|
|
|
|
|
} |
153
|
|
|
|
|
|
|
|
154
|
|
|
|
|
|
|
sub payload_size { |
155
|
1
|
|
|
1
|
1
|
3
|
my $self = shift; |
156
|
1
|
|
|
|
|
7
|
return length($self->{'payload'}); |
157
|
|
|
|
|
|
|
} |
158
|
|
|
|
|
|
|
|
159
|
|
|
|
|
|
|
sub source_ip { |
160
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
161
|
0
|
|
|
|
|
0
|
return $self->{'source_ip'}; |
162
|
|
|
|
|
|
|
} |
163
|
|
|
|
|
|
|
|
164
|
|
|
|
|
|
|
sub source_port { |
165
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
166
|
0
|
|
|
|
|
0
|
return $self->{'source_port'}; |
167
|
|
|
|
|
|
|
} |
168
|
|
|
|
|
|
|
|
169
|
|
|
|
|
|
|
sub size { |
170
|
2
|
|
|
2
|
1
|
202
|
my $self = shift; |
171
|
|
|
|
|
|
|
|
172
|
|
|
|
|
|
|
# Encode the packet if the size isn't known |
173
|
2
|
50
|
|
|
|
8
|
unless (defined $self->{'size'}) { |
174
|
|
|
|
|
|
|
# Not very efficient, but sure to work |
175
|
0
|
|
|
|
|
0
|
$self->encode(); |
176
|
|
|
|
|
|
|
} |
177
|
|
|
|
|
|
|
|
178
|
2
|
|
|
|
|
15
|
return $self->{'size'}; |
179
|
|
|
|
|
|
|
} |
180
|
|
|
|
|
|
|
|
181
|
|
|
|
|
|
|
sub decode { |
182
|
1
|
|
|
1
|
1
|
2
|
my $self = shift; |
183
|
1
|
|
|
|
|
3
|
my ($bindata) = @_; |
184
|
|
|
|
|
|
|
|
185
|
|
|
|
|
|
|
# Store the size of the packet we are decoding |
186
|
1
|
|
|
|
|
14
|
$self->{'size'} = length( $bindata ); |
187
|
|
|
|
|
|
|
|
188
|
|
|
|
|
|
|
# Decode the binary header (network endian) |
189
|
1
|
|
|
|
|
11
|
my ($vpxcc, $mpt, $seq_num, $timestamp, $ssrc) = unpack( 'CCnNN', $bindata ); |
190
|
1
|
|
|
|
|
5
|
$bindata = substr( $bindata, 12 ); |
191
|
|
|
|
|
|
|
|
192
|
|
|
|
|
|
|
# We only know how to parse version 2 of RTP |
193
|
1
|
|
|
|
|
3
|
$self->{'version'} = ($vpxcc & 0xC0) >> 6; |
194
|
1
|
50
|
|
|
|
7
|
if ($self->{'version'} != 2) { |
195
|
0
|
|
|
|
|
0
|
carp "Warning: unsupported RTP packet version ($self->{'version'})"; |
196
|
0
|
|
|
|
|
0
|
return 0; |
197
|
|
|
|
|
|
|
} |
198
|
|
|
|
|
|
|
|
199
|
|
|
|
|
|
|
# Extract from the bit fields |
200
|
1
|
|
|
|
|
4
|
$self->{'padding'} = ($vpxcc & 0x20) >> 5; |
201
|
1
|
|
|
|
|
3
|
$self->{'extension'} = ($vpxcc & 0x10) >> 4; |
202
|
1
|
|
|
|
|
3
|
my $csrc_count = ($vpxcc & 0x0F) >> 0; |
203
|
1
|
|
|
|
|
2
|
$self->{'marker'} = ($mpt & 0x80) >> 7; |
204
|
1
|
|
|
|
|
3
|
$self->{'payload_type'} = ($mpt & 0x7F) >> 0; |
205
|
1
|
|
|
|
|
3
|
$self->{'seq_num'} = $seq_num; |
206
|
1
|
|
|
|
|
3
|
$self->{'timestamp'} = $timestamp; |
207
|
1
|
|
|
|
|
3
|
$self->{'ssrc'} = $ssrc; |
208
|
|
|
|
|
|
|
|
209
|
|
|
|
|
|
|
|
210
|
|
|
|
|
|
|
# Process CSRC list |
211
|
1
|
|
|
|
|
15
|
for(my $c=0; $c<$csrc_count; $c++) { |
212
|
0
|
|
|
|
|
0
|
my $csrc = unpack('N', $bindata ); |
213
|
0
|
|
|
|
|
0
|
$bindata = substr( $bindata, 4 ); |
214
|
|
|
|
|
|
|
|
215
|
|
|
|
|
|
|
# Append it on to the list |
216
|
0
|
|
|
|
|
0
|
push( @{$self->{'csrc'}}, $csrc ); |
|
0
|
|
|
|
|
0
|
|
217
|
|
|
|
|
|
|
} |
218
|
|
|
|
|
|
|
|
219
|
|
|
|
|
|
|
# Ignore any header extention |
220
|
1
|
50
|
|
|
|
6
|
if ($self->{'extension'}) { |
221
|
0
|
|
|
|
|
0
|
my ($foo, $len) = unpack('nn', $bindata ); |
222
|
0
|
|
|
|
|
0
|
$bindata = substr( $bindata, ($len+1)*4 ); |
223
|
|
|
|
|
|
|
} |
224
|
|
|
|
|
|
|
|
225
|
|
|
|
|
|
|
# Ignore padding on end of packet |
226
|
1
|
50
|
|
|
|
4
|
if ($self->{'padding'}) { |
227
|
1
|
|
|
|
|
5
|
$self->{'padding'} = unpack('C', substr( $bindata, -1, 1 )); |
228
|
|
|
|
|
|
|
} |
229
|
|
|
|
|
|
|
|
230
|
|
|
|
|
|
|
# Whats left is the payload |
231
|
1
|
|
|
|
|
4
|
my $len = length( $bindata ) - $self->{'padding'}; |
232
|
1
|
|
|
|
|
3
|
$self->{'payload'} = substr($bindata,0,$len); |
233
|
|
|
|
|
|
|
|
234
|
|
|
|
|
|
|
# Undefine the source IP and port |
235
|
|
|
|
|
|
|
# (it is unknown and set elsewhere) |
236
|
1
|
|
|
|
|
3
|
$self->{'source_ip'} = undef; |
237
|
1
|
|
|
|
|
2
|
$self->{'source_port'} = undef; |
238
|
|
|
|
|
|
|
|
239
|
|
|
|
|
|
|
# Success |
240
|
1
|
|
|
|
|
3
|
return 1; |
241
|
|
|
|
|
|
|
} |
242
|
|
|
|
|
|
|
|
243
|
|
|
|
|
|
|
|
244
|
|
|
|
|
|
|
sub encode { |
245
|
2
|
|
|
2
|
0
|
5
|
my $self = shift; |
246
|
2
|
|
|
|
|
5
|
my $bindata = ''; |
247
|
|
|
|
|
|
|
|
248
|
2
|
|
|
|
|
4
|
my $csrc_count = scalar(@{$self->{'csrc'}}); |
|
2
|
|
|
|
|
7
|
|
249
|
2
|
100
|
|
|
|
5
|
my $pad = 0; $pad = 1 if ($self->{'padding'}); |
|
2
|
|
|
|
|
10
|
|
250
|
|
|
|
|
|
|
|
251
|
2
|
|
|
|
|
5
|
my $vpxcc = 0; |
252
|
2
|
|
|
|
|
6
|
$vpxcc |= ($self->{'version'} << 6) & 0xC0; |
253
|
2
|
|
|
|
|
5
|
$vpxcc |= ($pad << 5) & 0x20; |
254
|
2
|
|
|
|
|
5
|
$vpxcc |= ($self->{'extension'} << 4) & 0x10; |
255
|
2
|
|
|
|
|
4
|
$vpxcc |= ($csrc_count & 0x0F); |
256
|
2
|
|
|
|
|
12
|
$bindata .= pack('C', $vpxcc); |
257
|
|
|
|
|
|
|
|
258
|
2
|
|
|
|
|
4
|
my $mpt = 0; |
259
|
2
|
|
|
|
|
11
|
$mpt |= ($self->{'marker'} << 7) & 0x80; |
260
|
2
|
|
|
|
|
5
|
$mpt |= ($self->{'payload_type'} & 0x7F); |
261
|
2
|
|
|
|
|
6
|
$bindata .= pack('C', $mpt); |
262
|
|
|
|
|
|
|
|
263
|
2
|
|
|
|
|
608
|
$bindata .= pack('n', $self->{'seq_num'}); |
264
|
2
|
|
|
|
|
6
|
$bindata .= pack('N', $self->{'timestamp'}); |
265
|
2
|
|
|
|
|
8
|
$bindata .= pack('N', $self->{'ssrc'}); |
266
|
|
|
|
|
|
|
|
267
|
|
|
|
|
|
|
# Append list of CSRC |
268
|
2
|
|
|
|
|
4
|
foreach( @{$self->{'csrc'}} ) { |
|
2
|
|
|
|
|
13
|
|
269
|
0
|
|
|
|
|
0
|
$bindata .= pack('N', $_); |
270
|
|
|
|
|
|
|
} |
271
|
|
|
|
|
|
|
|
272
|
|
|
|
|
|
|
# Append the payload |
273
|
2
|
|
|
|
|
7
|
$bindata .= $self->{'payload'}; |
274
|
|
|
|
|
|
|
|
275
|
|
|
|
|
|
|
# Append the padding |
276
|
2
|
100
|
|
|
|
8
|
if ($self->{'padding'}) { |
277
|
1
|
|
|
|
|
5
|
for(my $p=0; $p<($self->{'padding'}-1); $p++) { |
278
|
3
|
|
|
|
|
8
|
$bindata .= pack('C', 0); |
279
|
|
|
|
|
|
|
} |
280
|
1
|
|
|
|
|
3
|
$bindata .= pack('C', $self->{'padding'}); |
281
|
|
|
|
|
|
|
} |
282
|
|
|
|
|
|
|
|
283
|
|
|
|
|
|
|
# Store the size of the encoded packet |
284
|
2
|
|
|
|
|
5
|
$self->{'size'} = length( $bindata ); |
285
|
|
|
|
|
|
|
|
286
|
2
|
|
|
|
|
7
|
return $bindata; |
287
|
|
|
|
|
|
|
} |
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
1; |
291
|
|
|
|
|
|
|
|
292
|
|
|
|
|
|
|
__END__ |