.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings.  \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
.    ds -- \(*W-
.    ds PI pi
.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
.    ds L" ""
.    ds R" ""
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds -- \|\(em\|
.    ds PI \(*p
.    ds L" ``
.    ds R" ''
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is turned on, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.ie \nF \{\
.    de IX
.    tm Index:\\$1\t\\n%\t"\\$2"
..
.    nr % 0
.    rr F
.\}
.el \{\
.    de IX
..
.\}
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" fudge factors for nroff and troff
.if n \{\
.    ds #H 0
.    ds #V .8m
.    ds #F .3m
.    ds #[ \f1
.    ds #] \fP
.\}
.if t \{\
.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
.    ds #V .6m
.    ds #F 0
.    ds #[ \&
.    ds #] \&
.\}
.    \" simple accents for nroff and troff
.if n \{\
.    ds ' \&
.    ds ` \&
.    ds ^ \&
.    ds , \&
.    ds ~ ~
.    ds /
.\}
.if t \{\
.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
.    \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.    \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
.    \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.    ds : e
.    ds 8 ss
.    ds o a
.    ds d- d\h'-1'\(ga
.    ds D- D\h'-1'\(hy
.    ds th \o'bp'
.    ds Th \o'LP'
.    ds ae ae
.    ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "Net::SIP::SDP 3pm"
.TH Net::SIP::SDP 3pm "2012-06-08" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Net::SIP::SDP \- Parsing and manipulation of SDP data for SIP
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  my $sdp = Net::SIP::SDP\->new( sdp_string );
\&  my @media = $sdp\->get_media;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Net::SIP::SDP can parse and manipulate \s-1SDP\s0 data.
.PP
It's not a general purpose \s-1SDP\s0 class (like Net::SDP) but
designed to work with \s-1SDP\s0 data contained in \s-1SIP\s0 packets
and for easy extraction and manipulation (for \s-1NAT\s0 etc)
of media information contained in the \s-1SDP\s0.
.PP
The class is also designed for easy creation of \s-1SDP\s0 bodies
in the context of the rest of Net::SIP::*.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.Vb 6
\&  # creation based on media data
\&  my $sdp = Net::SIP::SDP\->new(
\&        { addr => \*(Aq192.168.0.1\*(Aq },
\&        { port => 2012, proto => \*(AqRTP/AVP\*(Aq, media => \*(Aqaudio\*(Aq, fmt => 0 },
\&        { port => 2014, proto => \*(AqRTP/AVP\*(Aq, media => \*(Aqvideo\*(Aq, fmt => 0 },
\&  );
\&
\&  # parse from string
\&  my $sdp = Net::SIP::SDP\->new( sdp_string );
\&
\&  # extract all media data
\&  my @media = $sdp\->get_media;
\&
\&  # and replace them with new addr + port (for NAT)
\&  my @new_media,;
\&  foreach (@media) {
\&        my ($port,@socks) = create_rtp_sockets( \*(Aq192.168.178.1\*(Aq, $_\->{range} );
\&        push @new_media, [ \*(Aq192.168.178.1\*(Aq, $port ];
\&        ...
\&  }
\&  $sdp\->replace_media_listen( @new_media );
.Ve
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "new" 4
.IX Item "new"
Default constructor.
Depending on kind of arguments branches into \fBnew_from_string\fR or \fBnew_from_parts\fR.
See there.
.IP "new_from_string ( \s-1STRING\s0 )" 4
.IX Item "new_from_string ( STRING )"
Creates object from \s-1STRING\s0 containing the \s-1SDP\s0 data.
Raises an exception (e.g. \fIdie()\fR) if \s-1SDP\s0 is invalid.
.ie n .IP "new_from_parts ( \e%GLOBAL, @MEDIA )" 4
.el .IP "new_from_parts ( \e%GLOBAL, \f(CW@MEDIA\fR )" 4
.IX Item "new_from_parts ( %GLOBAL, @MEDIA )"
Creates object from specification.
\&\f(CW%GLOBAL\fR describes the global keys, usually only a common \f(CW\*(C`addr\*(C'\fR for all media but
any of the keys defined in \s-1RFC2327\s0 can be used.
.Sp
\&\f(CW@MEDIA\fR is a list of hash references, one hash for each media part. These hashes
can contain as keys the one-letter keys specified in \s-1RFC2327\s0 and/or special
keys for constructing the 'c' and 'm' line:
.RS 4
.IP "addr \- The address, used in the 'c' line." 8
.IX Item "addr - The address, used in the 'c' line."
.PD 0
.IP "port \-  The port number" 8
.IX Item "port -  The port number"
.IP "range \- Range of ports, for \s-1RTP/AVP\s0 defaults to 2, else 1" 8
.IX Item "range - Range of ports, for RTP/AVP defaults to 2, else 1"
.IP "media \- The media typ, e.g. 'audio','video',..." 8
.IX Item "media - The media typ, e.g. 'audio','video',..."
.IP "proto \- Transport protocol, ususally '\s-1RTP/AVP\s0' or 'udp'" 8
.IX Item "proto - Transport protocol, ususally 'RTP/AVP' or 'udp'"
.RE
.RS 4
.PD
.Sp
If the \s-1SDP\s0 should contain multiple values for the same key in the same
media section on can specifiy the value for the key as a \e@list instead
of a string (this is often the case for 'a' lines).
.RE
.SH "METHODS"
.IX Header "METHODS"
.IP "as_string" 4
.IX Item "as_string"
Returns string representation for object.
.IP "content_type" 4
.IX Item "content_type"
Returns 'application/sdp'
.IP "get_media" 4
.IX Item "get_media"
Returns list of all media described in the \s-1SDP\s0. If the caller expects
an array the result will be a list, otherwise a reference to a list.
.Sp
Each element of the list is a hash with the following keys:
.RS 4
.IP "addr \- \s-1IP4/IP6\s0 address for media" 8
.IX Item "addr - IP4/IP6 address for media"
.PD 0
.IP "port \- Start port" 8
.IX Item "port - Start port"
.IP "range \- Range for ports" 8
.IX Item "range - Range for ports"
.IP "proto \- Media proto, usually '\s-1RTP/AVP\s0' or 'udp'" 8
.IX Item "proto - Media proto, usually 'RTP/AVP' or 'udp'"
.IP "media \- Media typ, usually 'audio', 'video' or 'data'" 8
.IX Item "media - Media typ, usually 'audio', 'video' or 'data'"
.ie n .IP "fmt \- Format info from media line as \e@list, e.g ""[ 0,10,5 ]""." 8
.el .IP "fmt \- Format info from media line as \e@list, e.g \f(CW[ 0,10,5 ]\fR." 8
.IX Item "fmt - Format info from media line as @list, e.g [ 0,10,5 ]."
.IP "lines \- All lines from media description as \e@list of [ key,value ]." 8
.IX Item "lines - All lines from media description as @list of [ key,value ]."
.RE
.RS 4
.PD
.Sp
\&\fB\s-1WARNING\s0!\fR You should never manipulate the values you got from this function,
because this might affect the objects internals.
.RE
.IP "replace_media_listen ( \s-1NEW_MEDIA\s0 )" 4
.IX Item "replace_media_listen ( NEW_MEDIA )"
Replaces the exisisting media in the object with new media. Useful for \s-1NAT\s0.
.Sp
\&\s-1NEW_MEDIA\s0 is ether an array or a reference to an array. Each element in
the list consists of the new [ addr,port ] mapping for the matching media
entry.
.Sp
The number of entries in the list should be the same as the number of media
entries in the object ( see \fBget_media\fR ). If this is not the case it will
\&\f(CW\*(C`die()\*(C'\fR.
.IP "name2int ( \s-1NAME\s0, \s-1INDEX\s0 )" 4
.IX Item "name2int ( NAME, INDEX )"
Returns the \s-1RTP\s0 payload id for \s-1NAME\s0 (e.g. \*(L"telephone\-event/8000\*(R").
\&\s-1INDEX\s0 is the index into the list of media information, matching the list
returned from get_media. \s-1INDEX\s0 can also be 'audio','video'.., which
will then lookup at the first matching entry in the media list.