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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>Chapter 9. RawMIDI Interface</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="index.html" title="Writing an ALSA Driver" /><link rel="prev" href="ch08s03.html" title="Interrupt Handler" /><link rel="next" href="ch09s02.html" title="Constructor" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 9. RawMIDI Interface</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch08s03.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch09s02.html">Next</a></td></tr></table><hr /></div><div class="chapter" title="Chapter 9. RawMIDI Interface"><div class="titlepage"><div><div><h2 class="title"><a id="rawmidi-interface"></a>Chapter 9. RawMIDI Interface</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="ch09.html#rawmidi-interface-overview">Overview</a></span></dt><dt><span class="section"><a href="ch09s02.html">Constructor</a></span></dt><dt><span class="section"><a href="ch09s03.html">Callbacks</a></span></dt><dd><dl><dt><span class="section"><a href="ch09s03.html#rawmidi-interface-op-open"><code class="function">open</code> callback</a></span></dt><dt><span class="section"><a href="ch09s03.html#rawmidi-interface-op-close"><code class="function">close</code> callback</a></span></dt><dt><span class="section"><a href="ch09s03.html#rawmidi-interface-op-trigger-out"><code class="function">trigger</code> callback for output
substreams</a></span></dt><dt><span class="section"><a href="ch09s03.html#rawmidi-interface-op-trigger-in"><code class="function">trigger</code> callback for input
substreams</a></span></dt><dt><span class="section"><a href="ch09s03.html#rawmidi-interface-op-drain"><code class="function">drain</code> callback</a></span></dt></dl></dd></dl></div><div class="section" title="Overview"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="rawmidi-interface-overview"></a>Overview</h2></div></div></div><p>
The raw MIDI interface is used for hardware MIDI ports that can
be accessed as a byte stream. It is not used for synthesizer
chips that do not directly understand MIDI.
</p><p>
ALSA handles file and buffer management. All you have to do is
to write some code to move data between the buffer and the
hardware.
</p><p>
The rawmidi API is defined in
<code class="filename"><sound/rawmidi.h></code>.
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