65 lines
2.4 KiB
Groff
65 lines
2.4 KiB
Groff
.\" $NetBSD: esa.4,v 1.6 2003/08/04 02:22:48 grant Exp $
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.\"
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.\" Copyright (c) 2001, 2002 Jared D. McNeill <jmcneill@invisible.yi.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Neither the name of the author nor the names of any
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 6, 2002
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.Dt ESA 4
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.Os
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.Sh NAME
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.Nm esa
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.Nd ESS Technology Allegro-1 / Maestro-3 family audio device driver
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.Sh SYNOPSIS
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.Cd "esa* at pci? dev ? function ?"
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.Cd "audio* at esa?"
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.Cd "options ESA_NUM_VOICES=4"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the ESS Allegro-1 and Maestro-3 audio devices
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on the PCI bus.
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These devices are popular in laptop systems.
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.Pp
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The Allegro-1 and the Maestro-3 are full-duplex devices that allow
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independent playback and recording at sample rates between 8000Hz and
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48000Hz and are capable of playback at 8 and 16 bit in mono and stereo.
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.Pp
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Setting options ESA_NUM_VOICES=4 allows for hardware mixing in the device
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driver.
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Note that due to microcode constraints, the
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.Nm
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driver is currently limited to 4 simultaneous voices.
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.Sh SEE ALSO
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.Xr audio 4 ,
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.Xr pci 4
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Nx 1.5.3 .
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.Sh AUTHORS
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.An Jared D. McNeill Aq jmcneill@invisible.ca
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.Sh BUGS
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Hardware volume control is not yet supported by this driver.
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