SFVOD
Section: User Commands (1)
Updated: 3 MAR 1998
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NAME
sfvod - Speak Freely voice on demand server
SYNOPSIS
sfvod
[
-aduvx
]
[
-lfile
]
[
-pport
]
[
-rprogram
]
[
-ttimeout
]
[
soundfile...
]
[
-
sfmike options
]
DESCRIPTION
sfvod
monitors connections to a given port.
When a user connects with Speak Freely,
sfvod
transmits an audio file or live audio to the connected user.
sfvod
allows creation of servers which play audio on demand to any user
who connects to the host and port where a given audio file is published.
If the
SPEAKFREE_LWL_TELL
environment variable is set to a one or more Look Who's Listening
hosts,
sfvod
will publish its existence on those hosts. See the ``Look Who's
Listening'' section in the
sfspeaker
manual page for details on how to set the environment variables.
OPTIONS
- -a
-
Transmit live audio rather than a sound file.
- -d
-
Generate debug output on standard output.
- -lfile
-
Logs requests processed by the server in the
named
file.
The log is written in a format compatible with that of the
NCSA HTTPD server. If you're running multiple copies of
sfvod,
serving different sound files, each must write a separate log file
which you can consolidate later.
- -pport
-
sfvod
monitors the control port of the given port pair
(port
specifies the data--even numbered--port of the pair). When
a connection occurs, transmission of the specified
sound file or live audio commences. When a BYE message arrives
on the control port, transmission is terminated.
- -rprogram
-
The named
program
is executed to transmit the message to the connected user. The
default program is
sfmike.
- -ttimeout
-
If a remote site fails to send a BYE message, it will be timed out
(and hence become eligible for retransmission of the sound file
if another ID message arrives) after
timeout
seconds. The default timeout is 30 seconds.
- -u
-
Prints how-to-call information.
- -v
-
Causes
sfvod
to log all connections, disconnections, and timeouts to standard
output.
- -x
-
Dump host address records and packet contents to standard output
in hexadecimal.
- -
-
Any command line arguments that follow a single dash are passed
directly to
sfmike.
BUGS
sfvod
is a Perl script that transmits sound by invoking
sfmike.
In order to use it, you must have Perl installed on your system.
sfvod
was developed using Perl 4.0, patch level 36; the program has
also been tested under Perl 5.004.
When transmitting sound files,
sfvod
forks a copy of
sfmike
to service each request. If many simultaneous
requests are received, the compression overhead of multiple copies of
sfmike
may overload the CPU and create pauses in the transmitted audio. If
you're using GSM compression and expect substantial
traffic, consider pre-compressing your audio files with
toast
(found in the
gsm/bin
directory) and specifying the resulting .gsm file as the
soundfile
on the command line.
Multiple simultaneous requests may overload the outbound network
capacity, leading to pauses on the receiving end.
When sending live audio,
sfvod
kills and restarts
sfmike
each time a host connects or disconnects. This may result in a brief
interruption in the audio transmission. This could be eliminated by
adding a signal handler to
sfmike
that causes it to update its list of hosts directly.
SEE ALSO
perl(1),
sfmike(1),
sfspeaker(1),
toast(1)
AUTHOR
-
John Walker
WWW: http://www.fourmilab.ch/
This program is in the public domain.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- BUGS
-
- SEE ALSO
-
- AUTHOR
-
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Time: 12:37:46 GMT, July 10, 2022