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 RADIO(1)                                                           RADIO(1)




 NAME
      radio - receive audio UDP packets transmitted by broadcast

 SYNOPSIS
      radio [ -c port ] [ -d ] [ -f ] [ -l addr ] [ -m mcastgrp ]
       [ -n ] [ -p port ] [ -r addr ] [ -s ] [ -t ] [ -v volume ]

 DESCRIPTION
      Radio allows you to listen to audio transmitted as UDP packets on a
      local area network by broadcast(1).  Obviously, this requires a
      workstation with audio hardware; currently the program works on SGI
      Indigo and 4D/35 workstations, Sun Sparcs, all NeXTs, DECStations
      equipped with DEC LoFi, and any machine running the Audio File server
      from DEC CRL.

      Radio is normally run in the background.  You may need a system-
      specific tool to change the volume or direct the output to the speaker
      or headphone jack; e.g., on an SGI, you would use apanel(1);
       on a Sun you would use gaintool(1) or, when using X, x_gaintool(1)
      (these programs can be found in /usr/demo/SOUND in SunOS 4.1).  With
      OpenWindows 3.0, you can use audiotool(1).  (On the NeXT, just use the
      volume keys on the keyboard.)

      Some loss of UDP packets is tolerated; this is heard as short
      interruptions of the sound.

 OPTIONS
      -c port   Use this UDP port number as control port (default 54320).
                Normally you never need to change this; the control port is
                used by optional ``tuner'' software (not distributed) and
                possibly by listener polling programs.

      -d        Turn on debugging (a message on stderr for each 8 packets
                received, and when rare or unexpected events happen).

      -f        Filter mode: write the U-LAW audio data to stdout instead of
                sending it to the audio hardware.

      -l addr   Listen only for packets to IP address addr (useful for
                forwarding stations).

      -m mcastgrp
                Multicast group.  This only makes sense if the same
                multicast group is passed as address to broadcast(1).  Using
                multicasting instead of broadcasting reduces the load on
                machines that aren't listening.  You should use the same
                multicast group for all stations on the local network.
                (Note that even if a multicast group is specified, stations
                using broadcasts can still be picked up by radio).





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 RADIO(1)                                                           RADIO(1)




      -n        Noninterruptable mode (Sun Sparc only).  By default, radio
                notices when another program wants to open the audio output
                device, and temporarily ``backs off'' until the other
                program is finished, hoping it won't take too long.  This
                option turns off that feature.

      -p port   Receive packets sent to this UDP port number (default
                54321).  This corresponds to the port used by broadcast.
                Port numbers 1..99 are shorthands for 54321..54419.

      -r addr   Listen only for packets from IP address addr (useful for
                forwarding stations).

      -s        Secure mode: don't listen to the control port.  This is for
                really paranoid users: in theory, any user on the net can
                override the port specified with -p by sending a control
                message to the control port of your radio program.

      -t        Tee mode: write the U-LAW audio data to stdout as well as
                sending it to the audio hardware.

      -v volume Set the initial volume, on a scale from 0 to 100.  (SGI and
                Sun Sparc only.) By default, the volume is left unchanged.
                When the volume is specified this way, its original value is
                restored when the program exits.

 AUTHOR
      Guido van Rossum

 VERSION
      This manual page documents radio version 2.0, patchlevel 3.

 SEE ALSO
      broadcast(1), tuner(1), ektuner(1)

 COPYRIGHT
      Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
      Amsterdam, The Netherlands.

                              All Rights Reserved

      Permission to use, copy, modify, and distribute this software and its
      documentation for any purpose and without fee is hereby granted,
      provided that the above copyright notice appear in all copies and that
      both that copyright notice and this permission notice appear in
      supporting documentation, and that the names of Stichting Mathematisch
      Centrum or CWI not be used in advertising or publicity pertaining to
      distribution of the software without specific, written prior
      permission.

      STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO



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 RADIO(1)                                                           RADIO(1)




      THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
      FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
      FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
      OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
















































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