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Gary Scavone
2013-09-29 23:41:50 +02:00
committed by Stephen Sinclair
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<h1><a class="anchor" name="hello">Hello Sine!</a></h1>We'll continue our introduction to the Synthesis ToolKit with a simple sine-wave oscillator program. STK provides two different classes for sine-wave generation. We will first look at a generic waveform oscillator class, <a class="el" href="classWaveLoop.html">WaveLoop</a>, that can load a variety of common file types. In this example, we load a sine "table" from an STK RAW file (defined as monophonic, 16-bit, big-endian data). We use the class <a class="el" href="classFileWvOut.html">FileWvOut</a> to write the result to a 16-bit, WAV formatted audio file.<p>
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<a class="el" href="classWaveLoop.html">WaveLoop</a> is a subclass of <a class="el" href="classFileWvIn.html">FileWvIn</a>, which supports WAV, SND (AU), AIFF, MAT-file (Matlab), and RAW file formats with 8-, 16-, and 32-bit integer and 32- and 64-bit floating-point data types. <a class="el" href="classFileWvIn.html">FileWvIn</a> provides interpolating, read-once ("oneshot") functionality, as well as methods for setting the read rate and read position.<p>
<a class="el" href="classFileWvIn.html">FileWvIn</a> provides a "tick level" and interpolating interface to the <a class="el" href="classFileRead.html">FileRead</a> class. Likewise, <a class="el" href="classFileWvOut.html">FileWvOut</a> provides a "tick level" interface to the <a class="el" href="classFileWrite.html">FileWrite</a> class. <a class="el" href="classFileRead.html">FileRead</a> and <a class="el" href="classFileWrite.html">FileWrite</a> both support WAV, SND(AU), AIFF, MAT-file (Matlab), and RAW file formats with 8-, 16-, and 32-bit integer and 32- and 64-bit floating-point data types. <a class="el" href="classFileWvOut.html">FileWvOut</a> does not currently offer data interpolation functionality.<p>
The <a class="el" href="classWvIn.html">WvIn</a> and <a class="el" href="classWvOut.html">WvOut</a> parent classes and all subclasses support multi-channel sample frames. To distinguish single-sample frame operations from multi-channel frame operations, these classes also implement <code>tickFrame()</code> functions. When a <code>tick()</code> method is called for multi-channel data, frame averages are returned or the input sample is distributed across all channels of a sample frame.<p>
Nearly all STK classes inherit from the <a class="el" href="classStk.html">Stk</a> base class. <a class="el" href="classStk.html">Stk</a> provides a static sample rate which is queried by subclasses as needed. Because many classes use the current sample rate value during instantiation, it is important that the desired value be set at the beginning of a program. The default STK sample rate is 44100 Hz.<h2><a class="anchor" name="error">
Nearly all STK classes inherit from the <a class="el" href="classStk.html">Stk</a> base class. <a class="el" href="classStk.html">Stk</a> provides a static sample rate that is queried by subclasses as needed. Because many classes use the current sample rate value during instantiation, it is important that the desired value be set at the beginning of a program. The default STK sample rate is 44100 Hz.<h2><a class="anchor" name="error">
Error Handling</a></h2>
The ToolKit has some basic C++ error handling functionality built in. Classes that access files and/or hardware are most prone to runtime errors. To properly "catch" such errors, the above example should be rewritten as shown below.<p>
<div class="fragment"><pre class="fragment"><span class="comment">// sineosc.cpp STK tutorial program</span>
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<tr><td><A HREF="http://ccrma.stanford.edu/software/stk/"><I>The Synthesis ToolKit in C++ (STK)</I></A></td></tr>
<tr><td>&copy;1995-2005 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
<tr><td>&copy;1995-2007 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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