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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<!-- BEGIN META TAG INFO -->
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="home" href="http://developer.apple.com/">
<link rel="find" href="http://developer.apple.com/search/">
<link rel="stylesheet" type="text/css" href="../../documentation/css/adcstyle.css" title="fonts">
<script language="JavaScript" src="../../documentation/js/adc.js" type="text/javascript"></script>
<!-- END META TAG INFO -->
<!-- BEGIN TITLE -->
<title>SampleUSBAudioPlugin</title>
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<script language="JavaScript">
function JumpToNewPage() {
window.location=document.scpopupmenu.gotop.value;
return true;
}
</script>
</head>
<!-- BEGIN BODY OPEN -->
<body><a name="//apple_ref/doc/uid/DTS10003471" title="SampleUSBAudioPlugin"></a>
<!--END BODY OPEN -->
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<center>
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<!-- BEGIN LOGO AND SEARCH -->
<!--#include virtual="/includes/adcnavbar"-->
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<div id="breadcrumb">
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr>
<td scope="row"><img width="340" height="10" src="images/1dot.gif" alt=""></td>
<td><img width="340" height="10" src="images/1dot.gif" alt=""></td>
</tr>
<tr valign="middle">
<td align="left" colspan="2">
<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/Darwin/index.html">Darwin</a> > <a href="../../samplecode/Darwin/idxHardwareDrivers-date.html">Hardware & Drivers</a> >
</td>
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<td colspan="2" scope="row"><img width="680" height="35" src="images/1dot.gif" alt=""></td>
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<!-- START MAIN CONTENT -->
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<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr align="left" valign="top">
<td><h1><div id="pagehead">SampleUSBAudioPlugin</div></h1></td>
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<td id="scdetails">
<p><strong>Version:</strong> 1.0</p>
<p><strong>Posted:</strong> 2005-03-07</p>
<p><strong>Build Requirements:</strong> Xcode 1.5</p>
<p><strong>Runtime Requirements:</strong> 10.3.6</p>
<form name="scpopupmenu" onSubmit="return false;" method=post>
<p><strong>View Source Code:</strong>
<select name="gotop" onChange="JumpToNewPage();" style="width:340px"><option selected value="ingnore">Select File</option>
<option value="listing1.html">/AppleUSBAudioPlugin.h</option>
<option value="listing2.html">/ProcessFloatSamples.cpp</option>
<option value="listing3.html">/ProcessFloatSamples.h</option>
<option value="listing4.html">/Readme.txt</option>
<option value="listing5.html">/SampleUSBAudioPlugin.cpp</option>
<option value="listing6.html">/SampleUSBAudioPlugin.h</option></select>
</p>
</form>
<p><strong><a href="SampleUSBAudioPlugin.zip">Download Sample</a></strong> (“SampleUSBAudioPlugin.zip”, 17.3K)<BR>
<strong><a href="SampleUSBAudioPlugin.dmg">Download Sample</a></strong> (“SampleUSBAudioPlugin.dmg”, 70.9K)</p>
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<tr>
<td scope="row"><img width="680" height="10" src="images/1dot.gif" alt=""><br>
<img height="1" width="680" src="images/1dot_919699.gif" alt=""><br>
<img width="680" height="20" src="images/1dot.gif" alt=""></td>
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<td scope="row">
<h2>Description</h2>
<p>This is a sample AppleUSBAudio plug-in that performs a lowpass filtering (DSP) operation on audio streamed through an USB Device. Specifically, this plug-in uses a lowpass filter with a 400 Hz cutoff on streamed audio. </p><p>The AppleUSBAudio plug-in architecture allows an audio device manufacturer to insert host based signal processing designed to enhance the capabilities of their device. This method eliminates the need to clone the AppleUSBAudio driver and integrate device specific signal processing code, which will lose the incremental enhancements and bug fixes that Apple provides on a regular basis via Software Updates.</p><p>The AppleUSBAudio plug-in can perform any of the following functions on a class-compliant USB audio device:</p><p>* send a USB device request on the default control pipe (IOUSBDevRequest)</p><p>* process input samples as they are received by the device</p><p>* process output samples before they are sent to the device</p><p>* set a configuration application for the plug-in</p><p>Note: You must specify the unique vendorID/productID combination of the USB audio device within the sample project.</p>
<h2>Document Revision History</h2>
<table cellspacing="0" class="graybox" width="680">
<tr>
<th width="100">Date</th>
<th width="580">Notes</th>
</tr>
<tr><td scope="row">2005-03-07</td><td>USB audio plugin that performs a lowpass filtering operation on audio streamed through an audio USB Device.</td></tr>
</table>
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<td align="center"><br/>
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<th>Did this document help you?</th>
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<div style="margin-bottom: 8px"><a href="http://developer.apple.com/feedback/?v=1&url=/samplecode/SampleUSBAudioPlugin/index.html%3Fid%3DDTS10003471-1.0&media=dvd" target=_new>Yes</a>: Tell us what works for you.</div>
<div style="margin-bottom: 8px"><a href="http://developer.apple.com/feedback/?v=2&url=/samplecode/SampleUSBAudioPlugin/index.html%3Fid%3DDTS10003471-1.0&media=dvd" target=_new>It’s good, but:</a> Report typos, inaccuracies, and so forth.</div>
<div><a href="http://developer.apple.com/feedback/?v=3&url=/samplecode/SampleUSBAudioPlugin/index.html%3Fid%3DDTS10003471-1.0&media=dvd" target=_new>It wasn’t helpful</a>: Tell us what would have helped.</div>
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</body>
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