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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>core directory</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Writing an ALSA Driver" /><link rel="up" href="ch01.html" title="Chapter 1. File Tree Structure" /><link rel="prev" href="ch01.html" title="Chapter 1. File Tree Structure" /><link rel="next" href="ch01s03.html" title="include directory" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">core directory</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch01.html">Prev</a> </td><th width="60%" align="center">Chapter 1. File Tree Structure</th><td width="20%" align="right"> <a accesskey="n" href="ch01s03.html">Next</a></td></tr></table><hr /></div><div class="section" title="core directory"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="file-tree-core-directory"></a>core directory</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="ch01s02.html#file-tree-core-directory-oss">core/oss</a></span></dt><dt><span class="section"><a href="ch01s02.html#file-tree-core-directory-ioctl32">core/ioctl32</a></span></dt><dt><span class="section"><a href="ch01s02.html#file-tree-core-directory-seq">core/seq</a></span></dt><dt><span class="section"><a href="ch01s02.html#file-tree-core-directory-seq-oss">core/seq/oss</a></span></dt><dt><span class="section"><a href="ch01s02.html#file-tree-core-directory-deq-instr">core/seq/instr</a></span></dt></dl></div><p>
This directory contains the middle layer which is the heart
of ALSA drivers. In this directory, the native ALSA modules are
stored. The sub-directories contain different modules and are
dependent upon the kernel config.
</p><div class="section" title="core/oss"><div class="titlepage"><div><div><h3 class="title"><a id="file-tree-core-directory-oss"></a>core/oss</h3></div></div></div><p>
The codes for PCM and mixer OSS emulation modules are stored
in this directory. The rawmidi OSS emulation is included in
the ALSA rawmidi code since it's quite small. The sequencer
code is stored in <code class="filename">core/seq/oss</code> directory (see
<a class="link" href="ch01s02.html#file-tree-core-directory-seq-oss" title="core/seq/oss"><em class="citetitle">
below</em></a>).
</p></div><div class="section" title="core/ioctl32"><div class="titlepage"><div><div><h3 class="title"><a id="file-tree-core-directory-ioctl32"></a>core/ioctl32</h3></div></div></div><p>
This directory contains the 32bit-ioctl wrappers for 64bit
architectures such like x86-64, ppc64 and sparc64. For 32bit
and alpha architectures, these are not compiled.
</p></div><div class="section" title="core/seq"><div class="titlepage"><div><div><h3 class="title"><a id="file-tree-core-directory-seq"></a>core/seq</h3></div></div></div><p>
This directory and its sub-directories are for the ALSA
sequencer. This directory contains the sequencer core and
primary sequencer modules such like snd-seq-midi,
snd-seq-virmidi, etc. They are compiled only when
<code class="constant">CONFIG_SND_SEQUENCER</code> is set in the kernel
config.
</p></div><div class="section" title="core/seq/oss"><div class="titlepage"><div><div><h3 class="title"><a id="file-tree-core-directory-seq-oss"></a>core/seq/oss</h3></div></div></div><p>
This contains the OSS sequencer emulation codes.
</p></div><div class="section" title="core/seq/instr"><div class="titlepage"><div><div><h3 class="title"><a id="file-tree-core-directory-deq-instr"></a>core/seq/instr</h3></div></div></div><p>
This directory contains the modules for the sequencer
instrument layer.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch01.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch01.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch01s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 1. File Tree Structure </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> include directory</td></tr></table></div></body></html>
