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mash/tcl/mega/al-mega.tcl

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  1 # al-mega.tcl --
  2 #
  3 #       FIXME: This file needs a description here.
  4 #
  5 # Copyright (c) 1997-2002 The Regents of the University of California.
  6 # All rights reserved.
  7 #
  8 # Redistribution and use in source and binary forms, with or without
  9 # modification, are permitted provided that the following conditions are met:
 10 #
 11 # A. Redistributions of source code must retain the above copyright notice,
 12 #    this list of conditions and the following disclaimer.
 13 # B. Redistributions in binary form must reproduce the above copyright notice,
 14 #    this list of conditions and the following disclaimer in the documentation
 15 #    and/or other materials provided with the distribution.
 16 # C. Neither the names of the copyright holders nor the names of its
 17 #    contributors may be used to endorse or promote products derived from this
 18 #    software without specific prior written permission.
 19 #
 20 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
 21 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 22 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 23 # ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 24 # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 25 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 26 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 27 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 28 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 29 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 30 #
 31 # @(#) $Header: /usr/mash/src/repository/mash/mash-1/tcl/mega/al-mega.tcl,v 1.29 2002/02/03 04:27:39 lim Exp $
 32 
 33 
 34 import SDPParser
 35 
 36 Class MeGa
 37 
 38 MeGa instproc init args {
 39         eval $self next $args
 40         $self set sdp_ [new SDPParser]
 41 }
 42 
 43 MeGa instproc destroy {} {
 44         $self instvar sdp_
 45         delete $sdp_
 46         $self next
 47 }
 48 
 49 MeGa proc ctrlchan { media spec } {
 50         set tmp [split $spec /]
 51         set addr [lindex $tmp 0]
 52         if ![in_multicast $addr] {
 53                 return $spec
 54         }
 55         set port [lindex $tmp 1]
 56         switch $media {
 57         video {
 58                 incr port 2
 59         }
 60         audio {
 61                 incr port 4
 62         }
 63         mb {
 64                 incr port 6
 65         }
 66         sdp {
 67                 incr port 8
 68         }
 69         hm {
 70                 incr port 10
 71         }
 72         }
 73 
 74         set ttl [lindex $tmp 2]
 75 
 76         return $addr/$port/$ttl
 77 }
 78
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