source: multimedia/libdriv/alsa-lib.xml@ 16f0d158

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY alsa-lib-download-http " ">
  <!ENTITY alsa-lib-download-ftp  "&alsa-download-ftp;/lib/alsa-lib-&alsa-lib-version;.tar.bz2">
  <!ENTITY alsa-lib-md5sum        "1d428f46d6160f5e4bbdd64a2ff34f45">
  <!ENTITY alsa-lib-size          "980 KB">
  <!ENTITY alsa-lib-buildsize     "35 MB (with tests)">
  <!ENTITY alsa-lib-time          "0.3 SBU (with tests)">
]>

<sect1 id="alsa-lib" xreflabel="alsa-lib-&alsa-lib-version;">
  <?dbhtml filename="alsa-lib.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>alsa-lib-&alsa-lib-version;</title>

  <indexterm zone="alsa-lib">
    <primary sortas="a-alsa-lib">alsa-lib</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to ALSA Library</title>

    <para>
      The <application>ALSA Library</application> package contains
      the ALSA library used by programs (including <application>ALSA
      Utilities</application>) requiring access to the ALSA sound
      interface.
    </para>

    &lfs90_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&alsa-lib-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&alsa-lib-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &alsa-lib-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &alsa-lib-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &alsa-lib-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &alsa-lib-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">ALSA Library Dependencies</bridgehead>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="doxygen"/> and
      <xref linkend="python2"/>
    </para>

    <para condition="html" role="usernotes">User Notes:
      <ulink url="&blfs-wiki;/alsa-lib"/>
    </para>
  </sect2>

  <sect2 role="kernel"  id="alsa-lib-kernel">
    <title>Kernel Configuration</title>

    <para>
       If needed, enable the following options in the kernel
       configuration and recompile the kernel:
    </para>

    <screen><literal>Device Drivers ---&gt;
  &lt;*/m&gt; Sound card support ---&gt;                  [CONFIG_SOUND]
    &lt;*/m&gt; Advanced Linux Sound Architecture ---&gt; [CONFIG_SND]
            Select settings and drivers appropriate for your hardware.</literal></screen>

    <para>
      In the Device Drivers &rArr; Sound card support &rArr; Advanced Linux
      Sound Architecture section of the kernel configuration, select the settings
      and drivers appropriate for your hardware.  Ensure that the deprecated Device
      Drivers &rArr; Sound card support &rArr; Open Sound System is
      <emphasis>not</emphasis> selected.  If necessary, recompile and install your
      new kernel.
    </para>

    <indexterm zone="alsa-lib alsa-lib-kernel">
      <primary sortas="d-ALSA">ALSA</primary>
    </indexterm>

  </sect2>

  <sect2 role="installation">
    <title>Installation of ALSA Library</title>

    <para>
      First, fix a problem discovered after the release of alsa-lib-1.2.1:
    </para>

<screen><userinput remap="pre">sed -i '40a #include &lt;alsa/asoundlib.h&gt;' include/use-case.h</userinput></screen>

    <para>
      Install <application>ALSA Library</application> by
      running the following commands:
    </para>

<screen><userinput>./configure &amp;&amp;
make</userinput></screen>

   <para>
     If you have <application>Doxygen</application> installed and you wish to
     build the library API documentation, run the following
     commands from the top-level directory of the source tree:
   </para>

<screen remap="doc"><userinput>make doc</userinput></screen>
<!-- The test suite needs libasound.so now, otherwise both the config and
     midi_event tests will fail.
    <para>
      To test the results, issue: <command>make check</command>.
    </para>
-->
    <para>
      Now, as the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>make install</userinput></screen>

    <para>
      To install the API documentation, run the following command as
      the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"
        remap="doc"><userinput>install -v -d -m755 /usr/share/doc/alsa-lib-&alsa-lib-version;/html/search &amp;&amp;
install -v -m644 doc/doxygen/html/*.* \
                /usr/share/doc/alsa-lib-&alsa-lib-version;/html &amp;&amp;
install -v -m644 doc/doxygen/html/search/* \
                /usr/share/doc/alsa-lib-&alsa-lib-version;/html/search</userinput></screen>

    <para>
      The test suite requires the alsa-lib package to be installed to
      link against some libraries. Now that alsa-lib is installed, if you wish
      to run the tests, issue: <command>make check</command>.
    </para>

  </sect2>

  <sect2 role="configuration">
    <title>Configuring ALSA Library</title>

    <sect3 id="alsa-lib-config">
      <title>Config Files</title>

      <para>
        <filename>~/.asoundrc</filename> and
        <filename>/etc/asound.conf</filename>
      </para>

      <indexterm zone="alsa-lib alsa-lib-config">
        <primary sortas="e-AA.asoundrc">~/.asoundrc</primary>
      </indexterm>

      <indexterm zone="alsa-lib alsa-lib-config">
        <primary sortas="e-etc-asound.conf">/etc/asound.conf</primary>
      </indexterm>

    </sect3>

    <sect3>
      <title>Configuration Information</title>

      <para>
        The default <filename>alsa.conf</filename> is adequate for most
        installations. For extra functionality and/or advanced control of your
        sound device, you may need to create additional configuration files.
        For information on the available configuration parameters, visit
        <ulink url="http://www.alsa-project.org/main/index.php/Asoundrc"/>.
      </para>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Program</segtitle>
      <segtitle>Installed Library</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          aserver
        </seg>
        <seg>
          libasound.so and
          libatopology.so
           <!-- and four others under /usr/lib/alsa-lib/smixer -->
        </seg>
        <seg>
          /usr/include/alsa,
          /usr/lib/alsa-lib,
          /usr/share/alsa and
          /usr/share/doc/alsa-lib-&alsa-lib-version;
        </seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="aserver">
        <term><command>aserver</command></term>
        <listitem>
          <para>
            is the ALSA server.
          </para>
          <indexterm zone="alsa-lib aserver">
            <primary sortas="b-aserver">aserver</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libasound">
        <term><filename class="libraryfile">libasound.so</filename></term>
        <listitem>
          <para>
            contains the ALSA API functions.
          </para>
          <indexterm zone="alsa-lib libasound">
            <primary sortas="c-libasound">libasound.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libatopology">
        <term><filename class="libraryfile">libatopology.so</filename></term>
        <listitem>
          <para>
            contains API functions for the ALSA topologies.
          </para>
          <indexterm zone="alsa-lib libatopology">
            <primary sortas="c-libatopology">libatopology.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>  

    </variablelist>

  </sect2>

</sect1>