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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">
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<title>ExtractMovieAudioToAIFF</title>
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<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/QuickTime/index.html">QuickTime</a> > <a href="../../samplecode/QuickTime/idxMusicAudio-date.html">Audio</a> >
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<td><h1><div id="pagehead">ExtractMovieAudioToAIFF</div></h1></td>
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<p><strong>Version:</strong> 1.0.1</p>
<p><strong>Posted:</strong> 2006-03-31</p>
<p><strong>Build Requirements:</strong> Xcode 2.2 or greater using the Mac OSX 10.4 Universal SDK</p>
<p><strong>Runtime Requirements:</strong> Mac OS X 10.4.x w/QuickTime 7</p>
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<p><strong>View Source Code:</strong>
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<option value="listing1.html">/AIFFWriter.h</option>
<option value="listing2.html">/AIFFWriter.m</option>
<option value="listing3.html">/main.m</option>
<option value="listing4.html">/MyController.h</option>
<option value="listing5.html">/MyController.m</option></select>
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<p><strong><a href="ExtractMovieAudioToAIFF.zip">Download Sample</a></strong> (“ExtractMovieAudioToAIFF.zip”, 104.6K)<BR>
<strong><a href="ExtractMovieAudioToAIFF.dmg">Download Sample</a></strong> (“ExtractMovieAudioToAIFF.dmg”, 163.9K)</p>
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<h2>Description</h2>
<p>ExtractMovieAudioToAIFF contains simple class called AIFFWriter that encapsulates the functionality of two sets of APIs; QuickTime's Audio Extraction API's and Core Audio's Audio File APIs.</p><p>This class will either perform the extraction and file writing on a separate thread if it can, or do so on the main thread in slices thereby not blocking the UI. It also implements a progress callback similar to a movie export progress proc. so clients of the class can drive some UI element like a progress bar.</p><p>The sample application uses an instance of the AIFFWriter class to easily perform audio extraction from a QTKit QTMovie to an AIFF file.</p><p>The AIFFWriter class uses the default extraction channel layout which is the aggregate channel layout of the movie (for example, all Rights mixed together, all Left Surrounds mixed together, etc).</p><p>The output stream description for the file is 16-bit, interleaved big endian with the sample rate set to the highest sample rate found in the movie.</p><p>This project builds a Universal Binary target.</p>
<h2>Document Revision History</h2>
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<th width="100">Date</th>
<th width="580">Notes</th>
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<tr><td scope="row">2006-03-31</td><td>Now ensures a Movie is fully loaded before extraction can begin. See Q&A1469.</td></tr>
<tr><td scope="row">2006-01-25</td><td>Demonstrates how to extract audio from QuickTime Movies and write the data to an AIFF file.</td></tr>
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<div style="margin-bottom: 8px"><a href="http://developer.apple.com/feedback/?v=1&url=/samplecode/ExtractMovieAudioToAIFF/index.html%3Fid%3DDTS10003824-1.0&media=dvd" target=_new>Yes</a>: Tell us what works for you.</div>
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