Amsb(1) Amsb(1)
NAME
Amsb - a network-transparent audio server for the Microsoft Sound Board.
SYNOPSIS
The AF audio server is a network transparent system developed at Digital
CRL. Amsb permits using the Microsoft Sound Board audio hardware in a dis-
tributed environment.
DESCRIPTION
Amsb is an AF server with Microsoft Sound Board device dependent support.
STARTING UP
Amsb [:portOffset] [options] &
OPTIONS
-help
Use the help switch to determine device independent arguments.
-device device
Specifies the name of the Microsoft Sound Board audio special device
file. If this switch is not used, the Amsb audio server will default
to the device specified by the AUDIO_DEVICE environment variable or
the /dev/msb0 device.
-hrate <#>
Causes the server to set the audio hardware sampling rate. The
default sampling rate is 8000 Hz. The hardware supports 5512, 6615,
8000, 9600, 11025, 16000, 18900, 22050, 27428, 32000, 33075, 37800,
44100, and 48000 Hz rates.
AUDIO DEVICES
The Amsb audio server presents three audio devices to client applications.
These audio devices map to the audio hardware using stereo data, left chan-
nel only, and right channel only. The sampling rate of the audio devices
is set by the hrate switch. The default audio data type is LIN16. AF
conversion services support other datatypes.
CONNECTION NAME
From the user's prospective, every AF server has an audio connection of the
form:
hostname:portOffset
This information is used by the application to determine how it should con-
nect to the server.
hostname
The hostname specifies the name of the machine to which the audio
device is physically connected.
portOffset
The portOffset is used to identify the audio server's port on host-
name. For example, to simultaneously run two audio servers on a
given host, you might select 0 or 1 for portOffset.
If the connection name to an audio server is not specified, then the
environment variables AUDIOFILE or DISPLAY will be used.
ACCESS CONTROL
The sample server provides two types of access control: an authorization
protocol which provides a list of ``magic cookies'' clients can send to
request access, and a list of hosts from which connections are always
accepted.
BUGS
If you encounter a repeatable bug, please submit a problem report to () and
include the source code if possible.
SEE ALSO
AF(1), Aaxp(1), Amaxine(1), Alofi(1), Ajv(1), Amsb(1), Aj300(1), aplay(1),
arecord(1), apass(1), aset(1), abrowse(1), afft(1), ahost(1), aphone(1),
aprop(1), ahs(1), axset(1), xpow(1), afxctl(1), aname2num(1), alsatoms(1),
aevents(1), abob(1)
COPYRIGHT
See the COPYRIGHTS file.
Copyright 1991-1994, Digital Equipment Corporation and the Massachusetts
Institute of Technology.
AUTHORS
Digital Cambridge Research Lab