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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>
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<link rel="home" href="http://developer.apple.com/">
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<title>SCAudioCompress</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">SCAudioCompress</div></h1></td>
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<p><strong>Version:</strong> 1.0</p>
<p><strong>Posted:</strong> 2006-08-22</p>
<p><strong>Build Requirements:</strong> Macintosh: Xcode 2.4 or greater with QuickTime 7.1.x SDK
Windows: Visual Studio Dot Net (Visual C++ Dot Net edition) with QuickTime 7.1.x SDK.</p>
<p><strong>Runtime Requirements:</strong> Mac OS X 10.4.6 w/QuickTime 7.1.1 or greater or a version of Windows capable of running QuickTime 7.1 or greater.</p>
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<option value="listing1.html">/ReadMe.txt</option>
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<p><strong><a href="scaudiocompress.zip">Download Sample</a></strong> (“scaudiocompress.zip”, 35.8K)<BR>
<strong><a href="scaudiocompress.dmg">Download Sample</a></strong> (“scaudiocompress.dmg”, 97.1K)</p>
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<h2>Description</h2>
<p>scaudiocompress is a command line utility that illustrates usage of the SCAudio component SCAudioFillBuffer API's.</p><p>Since QuickTime 7, SCAudio (also known as Standard Audio Compression component, StdAudio, StdAudio Dialog and even 'scdi'/'audi') has allowed clients to configure an audio export operation, given an input format, (optionally) a starting output format, and (optionally) some rules about the kinds of output allowed.</p><p>StdAudio exposes all of its functionality via properties and the QTSet/GetComponentProperty{Info} API's. In addition, it allows a client to display the standard QuickTime audio compression dialog using SCRequestImageSettings().</p><p>New in QuickTime 7.1, the StdAudio component not only allows one to configure an export, it can actually perform the export using an interface identical to AudioConverter's AudioConverterFillComplexBuffer API.</p><p>The value added is that:</p><p>(1) the StdAudio path incorporates a mixer into its chain, so it can perform mix-downs in addition to encodes, decodes, and transcodes.</p><p>(2) It is available on MacOSX/Windows as part of the QuickTime 7.1 SDK. SCAudioFillBuffer's processing chain uses:</p><p>(1) an AudioConverter for decode (if necessary)</p><p>(2) a MatrixMixer for mixing (if necessary)</p><p>(3) another AudioConverter for encode (if necessary)</p><p>The scaudiocompress tool demonstrates how to read source packets of audio using AudioFile API (when reading from audio files) or MovieAudioExtraction (when sourcing from a QuickTime movie). The source data is pulled through the StdAudio compression chain, then written to an output file using AddMediaSample2 (if writing to a QuickTime movie), AudioFileWritePackets (if writing a .caf file), or fwrite (if writing a raw interleaved headerless pcm file). scaudiocompress can be run headlessly, or in "interactive" mode, popping up the StdAudio dialog to allow a user to select an output format, if desired.</p><p>The code runs on Mac OS X or Windows (NOTE: on Windows, reading/writing is limited to QuickTime movies, as the AudioFile API is not available in the Windows environment).</p>
<h2>Document Revision History</h2>
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<th width="100">Date</th>
<th width="580">Notes</th>
</tr>
<tr><td scope="row">2006-08-22</td><td>Xcode 2.4</td></tr>
<tr><td scope="row">2006-07-28</td><td>Demonstrates audio compression using QuickTime Standard Audio Compression Component</td></tr>
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<th>Did this document help you?</th>
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