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Release 4.1.3 tarball

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Gary Scavone
2013-09-29 23:38:16 +02:00
committed by Stephen Sinclair
parent 503ed3cc9f
commit e11bff2fe8
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<!-- Generated by Doxygen 1.3.6 -->
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<h1><a class="anchor" name="multichannel">Multi-Channel I/O</a></h1>The ToolKit <a class="el" href="classWvIn.html">WvIn</a> and <a class="el" href="classWvOut.html">WvOut</a> classes (and their subclasses) support multi-channel audio data input and output. A set of interleaved audio samples representing a single time "slice" is referred to as a <em>sample frame</em>. At a sample rate of 44.1 kHz, a four-channel audio stream will have 44100 sample frames per second and a total of 176400 individual samples per second.<p>
Most STK classes process single-sample data streams via their <code>tick()</code> function. In order to distinguish single-sample and sample frame calculations, the <a class="el" href="classWvIn.html">WvIn</a> and <a class="el" href="classWvOut.html">WvOut</a> classes implement both <code>tick()</code> and <code>tickFrame()</code> functions. The <code>tickFrame()</code> functions take or return a pointer to an array of audio data representing one or more sample frames. For single-channel streams, the <code>tick()</code> and <code>tickFrame()</code> functions produce equivalent results. When <code>tick()</code> is called for a multi-channel stream, however, the function either returns a sample frame average (<a class="el" href="classWvIn.html">WvIn</a>) or writes a single sample argument to all channels (<a class="el" href="classWvOut.html">WvOut</a>).<p>
Multi-channel support for realtime audio input and output is dependent on the audio device(s) available on your system.<p>
The following example demonstrates the use of the <a class="el" href="classWvOut.html">WvOut</a> class for creating a four channel, 16-bit AIFF formatted audio file. We will use four sinewaves of different frequencies for the first two seconds and then a single sinewave for the last two seconds.<p>
<pre class="fragment"><div><span class="comment">// foursine.cpp</span>
<div class="fragment"><pre><span class="comment">// foursine.cpp</span>
<span class="preprocessor">#include "WaveLoop.h"</span>
<span class="preprocessor">#include "WvOut.h"</span>
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<span class="keywordflow">return</span> 0;
}
</div></pre><p>
</pre></div><p>
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