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.\" ========================================================================
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.IX Title "Net::RTP 3"
.TH Net::RTP 3 "2008-01-13" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Net::RTP \- Send and receive RTP packets (RFC3550)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Net::RTP;
.Ve
.PP
.Vb 1
\&  my $rtp = new Net::RTP( LocalPort=>5170, LocalAddr=>'233.122.227.171' );
.Ve
.PP
.Vb 2
\&  my $packet = $rtp->recv();
\&  print "Payload type: ".$packet->payload_type()."\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`Net::RTP\*(C'\fR module subclasses IO::Socket::Multicast6 to enable
you to manipulate multicast groups. The multicast additions are 
optional, so you may also send and recieve unicast packets.
.IP "$rtp = new Net::RTP( [LocalAdrr=>$addr, LocalPort=>$port,...] )" 4
.IX Item "$rtp = new Net::RTP( [LocalAdrr=>$addr, LocalPort=>$port,...] )"
The \fInew()\fR method is the constructor for the Net::RTP class. 
It takes the same arguments as IO::Socket::INET, however 
the \fBProto\fR argument defaults to \*(L"udp\*(R", which is more appropriate for \s-1RTP\s0.
.Sp
The Net::RTP super-class used will depend on what is available on your system
it will try and use one of the following (in order of preference) :
.Sp
.Vb 4
\&        IO::Socket::Multicast6 (IPv4 and IPv6 unicast and multicast)
\&        IO::Socket::Multicast (IPv4 unicast and multicast)
\&        IO::Socket::INET6 (IPv4 and IPv6 unicast)
\&        IO::Socket::INET (IPv4 unicast)
.Ve
.Sp
If LocalAddr looks like a multicast address, then Net::RTP will automatically 
try and join that multicast group for you.
.ie n .IP "my $packet\fR = \f(CW$rtp\->recv( [$size] )" 4
.el .IP "my \f(CW$packet\fR = \f(CW$rtp\fR\->recv( [$size] )" 4
.IX Item "my $packet = $rtp->recv( [$size] )"
Blocks and waits for an \s-1RTP\s0 packet to arrive on the \s-1UDP\s0 socket.
The read \f(CW$size\fR defaults to 2048 which is usually big enough to read
an entire \s-1RTP\s0 packet (as it is advisable that packets are less than 
the Ethernet \s-1MTU\s0).
.Sp
Returns a \f(CW\*(C`Net::RTP::Packet\*(C'\fR object or \fBundef\fR if there is a problem.
.ie n .IP "$rtp\->send( $packet )" 4
.el .IP "$rtp\->send( \f(CW$packet\fR )" 4
.IX Item "$rtp->send( $packet )"
Send a Net::RTP::Packet from out of the \s-1RTP\s0 socket. 
The \fBPeerPort\fR and \fBPeerAddr\fR should be defined in order to send packets. 
Returns the number of bytes sent, or the undefined value if there is an error.
.IP "$rtp\->\fIsuperclass()\fR" 4
.IX Item "$rtp->superclass()"
Returns the name of the super-class that Net::RTP chose to use.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Net::RTP::Packet
.PP
IO::Socket::Multicast6
.PP
IO::Socket::INET6
.PP
IO::Socket::Multicast
.PP
IO::Socket::INET
.PP
<http://www.ietf.org/rfc/rfc3550.txt>
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs or feature requests to
\&\f(CW\*(C`bug\-net\-rtp@rt.cpan.org\*(C'\fR, or through the web interface at
<http://rt.cpan.org>.  I will be notified, and then you will automatically
be notified of progress on your bug as I make changes.
.SH "AUTHOR"
.IX Header "AUTHOR"
Nicholas J Humfrey, njh@cpan.org
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (C) 2006 University of Southampton
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, either Perl version 5.005 or, at
your option, any later version of Perl 5 you may have available.