static/netbsd/man4/man4.sgimips/mavb.4 3.html


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<table class="head">
  <tr>
    <td class="head-ltitle">MAVB(4)</td>
    <td class="head-vol">Device Drivers Manual (sgimips)</td>
    <td class="head-rtitle">MAVB(4)</td>
  </tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">mavb</code> &#x2014; <span class="Nd">Moosehead
    A/V Board audio device</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp"><code class="Cd">mavb0 at mace0 offset 0x300000 intr 6</code>
  <br/>
  <code class="Cd">audio* at audiobus?</code></p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The <code class="Nm">mavb</code> driver provides support for the
    Moosehead A/V Board found on SGI O2 machines.</p>
<p class="Pp">The Moosehead A/V Board uses an AD1843 codec that supports 8- and
    16-bit audio sample recording and playback at rates from 5 to 54 kHz, with 1
    Hz resolution. The <code class="Nm">mavb</code> driver also makes it
    possible to control the playback volume by using the buttons on the front of
    the O2.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
  ALSO</a></h1>
<p class="Pp"><a class="Xr">audio(4)</a>, <a class="Xr">sgimips/intro(4)</a>,
    <a class="Xr">sgimips/mace(4)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<p class="Pp">The <code class="Nm">mavb</code> driver first appeared in
    <span class="Ux">OpenBSD 3.7</span>. It was later ported to
    <span class="Ux">NetBSD 5.0</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<p class="Pp">The <code class="Nm">mavb</code> driver was written by Mark
    Kettenis, and ported to <span class="Ux">NetBSD</span> by Jared D.
  McNeill.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
<p class="Pp">The analog mixer in the AD1843 codec does not provide a master
    volume control. Therefore, the O2 volume buttons only control the output
    volume of the DAC.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
<p class="Pp">Currently only sample rates up to 48 kHz are supported. Recording
    is not implemented yet. The second DAC on the AD1843 codec sits idle.</p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">February 17, 2017</td>
    <td class="foot-os">NetBSD 10.1</td>
  </tr>
</table>