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Document the possibility of setting default values for

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mixer channels via boot loader.
While I am here, document the snd_driver metadriver.
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Josef El-Rayes 2004-06-20 16:34:40 +00:00
parent 18e6cace95
commit e500dbc501
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=21202
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en_US.ISO8859-1/books/handbook/multimedia/chapter.sgml
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@ -192,7 +192,10 @@
</indexterm> </indexterm>
<para>To use your sound device, you will need to load the proper <para>To use your sound device, you will need to load the proper
device driver. This may be accomplished in one of two ways. device driver. If you are not sure which driver to use, you may
try to load snd_driver, which is a metadriver loading the most common
device drivers at once, this speeds up the search for the correct driver.
Loading the device driver may be accomplished in one of two ways.
The easiest way is to simply load a kernel module for your sound The easiest way is to simply load a kernel module for your sound
card with &man.kldload.8; which can either be done from the card with &man.kldload.8; which can either be done from the
command line:</para> command line:</para>
@ -522,7 +525,34 @@ pcm0: &lt;SB16 DSP 4.11&gt; on sbc0</screen>
to 4 as in the above example. On a system using &man.devfs.5;, the above will automatically be to 4 as in the above example. On a system using &man.devfs.5;, the above will automatically be
allocated transparently to the user.</para> allocated transparently to the user.</para>
</sect2> </sect2>
</sect1>
<sect2>
<sect2info>
<authorgroup>
<author>
<firstname>Josef</firstname>
<surname>El-Rayes</surname>
<contrib>Contributed by </contrib>
</author>
</authorgroup>
</sect2info>
<title>Setting default values for mixer channels</title>
<para>The default values for the different mixer channels are
hardcoded in the sourcecode of the pcm driver. There are
a lot of different applications and daemons that allow
you to set values for the mixer they remember and set
each time they are started, but this is not a clean
solution, we want to have default values at the driver
level. This is accomplished by defining the apropriate
values in <filename>/boot/loader.conf</filename>. E.g.:</para>
<programlisting>pcm0.vol="100"</programlisting>
<para>This will set the vol channel to a default value of
100, as soon as the pcm module gets loaded.</para>
</sect2>
</sect1>
<sect1 id="sound-mp3"> <sect1 id="sound-mp3">
<sect1info> <sect1info>