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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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<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> > <A HREF="javascript:location.replace('index.html');">SCAudioCompress</A> >
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<td><h1><div id="pagehead">SCAudioCompress</div></h1></td>
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<h2>/ReadMe.txt</h2>
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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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<!--googleon: index -->
<pre class="sourcecodebox">scaudiocompress is a command line utility that illustrates usage of the SCAudio
component SCAudioFillBuffer API's. Since QuickTime 7, the SCAudio (aka
Standard Audio Compression component, aka StdAudio, aka StdAudio dialog, aka
'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. 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().
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. The value added is that
(1) the StdAudio path incorporates a mixer into its chain, so it can perform
mix-downs in addition to encodes, decodes, and transcodes. (2) It is available
on MacOSX/Windows as part of the QuickTime 7.1 SDK. SCAudioFillBuffer's
processing chain uses:
(1) an AudioConverter for decode (if necessary)
(2) a MatrixMixer for mixing (if necessary)
(3) another AudioConverter for encode (if necessary)
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.
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).</pre>
<!--googleoff: index -->
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