Ajv(1)

NAME
Ajv - a network-transparent audio server for JVideo.

SYNOPSIS

The AF audio server is a network transparent system developed at Digital CRL. for using JVideo audio hardware in a distributed environment.

DESCRIPTION

Ajv is an AF server with JVideo device dependent support.

STARTING UP
Ajv [:portOffset] [options] &

OPTIONS

-help

    Use the help switch to determine device independent arguments.

-device device

    Specifies the name of the JVideo audio special device file. If this switch is not used, the Ajv audio server will default to the device specified by the AUDIO_DEVICE environment variable or the devjva0 device.

-ukernel lodfile

    Specifies an alternate DSP56001 absolute lodfile. If ukernel is not specified, the server checks for the AF_UKERNEL environment variable. If neither the switch nor the AF_UKERNEL environment is used, the server looks for the path DIR/Ajvmain.lod where DIR is the LODPATH environment variable if it exists, otherise it is the config variable LODDIR.

-hrate <#>

    Causes the server to set the audio hardware sampling rate. The default sampling rate is 8000 Hz. The JVideo hardware supports 8000, 16000, 22000, 32000, 44100, and 48000 Hz rates.

AUDIO DEVICES

The Ajv audio server presents three audio devices to client applications. These audio devices map to the audio hardware using stereo data, left channel only, and right channel only. The sampling rate of the audio devices is set by the hrate switch. The supported audio data type is LIN16 for all sample rates, unlike the Ajv server in the previous release.

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 connect 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 hostname. 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 af-bugs@crl.dec.com 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