1<html><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 V1.78.1"><link rel="home" href="index.html" title="Writing an ALSA Driver"><link rel="up" href="file-tree.html" title="Chapter 1. File Tree Structure"><link rel="prev" href="file-tree.html" title="Chapter 1. File Tree Structure"><link rel="next" href="file-tree-include-directory.html" title="include directory"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><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="file-tree.html">Prev</a> </td><th width="60%" align="center">Chapter 1. File Tree Structure</th><td width="20%" align="right"> <a accesskey="n" href="file-tree-include-directory.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="file-tree-core-directory"></a>core directory</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="file-tree-core-directory.html#file-tree-core-directory-oss">core/oss</a></span></dt><dt><span class="section"><a href="file-tree-core-directory.html#file-tree-core-directory-ioctl32">core/ioctl32</a></span></dt><dt><span class="section"><a href="file-tree-core-directory.html#file-tree-core-directory-seq">core/seq</a></span></dt><dt><span class="section"><a href="file-tree-core-directory.html#file-tree-core-directory-seq-oss">core/seq/oss</a></span></dt><dt><span class="section"><a href="file-tree-core-directory.html#file-tree-core-directory-deq-instr">core/seq/instr</a></span></dt></dl></div><p> 2 This directory contains the middle layer which is the heart 3 of ALSA drivers. In this directory, the native ALSA modules are 4 stored. The sub-directories contain different modules and are 5 dependent upon the kernel config. 6 </p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="file-tree-core-directory-oss"></a>core/oss</h3></div></div></div><p> 7 The codes for PCM and mixer OSS emulation modules are stored 8 in this directory. The rawmidi OSS emulation is included in 9 the ALSA rawmidi code since it's quite small. The sequencer 10 code is stored in <code class="filename">core/seq/oss</code> directory (see 11 <a class="link" href="file-tree-core-directory.html#file-tree-core-directory-seq-oss" title="core/seq/oss"><em class="citetitle"> 12 below</em></a>). 13 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="file-tree-core-directory-ioctl32"></a>core/ioctl32</h3></div></div></div><p> 14 This directory contains the 32bit-ioctl wrappers for 64bit 15 architectures such like x86-64, ppc64 and sparc64. For 32bit 16 and alpha architectures, these are not compiled. 17 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="file-tree-core-directory-seq"></a>core/seq</h3></div></div></div><p> 18 This directory and its sub-directories are for the ALSA 19 sequencer. This directory contains the sequencer core and 20 primary sequencer modules such like snd-seq-midi, 21 snd-seq-virmidi, etc. They are compiled only when 22 <code class="constant">CONFIG_SND_SEQUENCER</code> is set in the kernel 23 config. 24 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="file-tree-core-directory-seq-oss"></a>core/seq/oss</h3></div></div></div><p> 25 This contains the OSS sequencer emulation codes. 26 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="file-tree-core-directory-deq-instr"></a>core/seq/instr</h3></div></div></div><p> 27 This directory contains the modules for the sequencer 28 instrument layer. 29 </p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="file-tree.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="file-tree.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="file-tree-include-directory.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> 30