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.\" $OpenBSD: autest.1,v 1.4 2003/03/28 09:47:21 jmc Exp $
.\"
.\" Copyright (c) 2002 Jason L. Wright (jason@thought.net)
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by Jason L. Wright
.\" 4. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd September 10, 2002
.Dt AUTEST 1
.Os
.Sh NAME
.Nm autest
.Nd test audio encoding output
.Sh SYNOPSIS
.Nm autest
.Op Fl f Ar device
.Sh DESCRIPTION
The
.Nm
utility opens the
.Xr audio 4
device specified with the
.Fl f
flag
or
.Pa /dev/sound
if not specified,
and iterates through all of the encodings supported by the device playing
a 440Hz tone in the proper format.
The tone should sound almost identical in each of the formats.
.Pp
.Nm
can produce tones in any of the following formats and will skip other
formats if supported by the device:
.Bl -tag -width XXXXXXXXXX
.It Cm mu-law
8bit mu-law companded
.It Cm A-law
8bit A-law companded
.It Cm adpcm
4 bit adaptive differential pulse code modulation
.It Cm ulinear
8 bit unsigned linear
.It Cm ulinear_le
16 bit unsigned linear little endian
.It Cm ulinear_be
16 bit unsigned linear big endian
.It Cm slinear
8 bit signed linear (twos complement)
.It Cm slinear_le
16 bit signed linear little endian (twos complement)
.It Cm slinear_be
16 bit signed linear big endian (twos complement)
.Sh SEE ALSO
.Xr audio 4
.Sh BUGS
The ADPCM encoding sounds very noisy on CS4231 (it's probably incorrect).
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