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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<h1>JetTable.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_JETTABL_H</span>
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<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_JETTABL_H</span>
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<a name="l00003"></a>00003 <span class="preprocessor"></span>
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<a name="l00004"></a>00004 <span class="preprocessor">#include "Function.h"</span>
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<a name="l00005"></a>00005
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<a name="l00006"></a>00006 <span class="keyword">namespace </span>stk {
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<a name="l00007"></a>00007
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<a name="l00008"></a>00008 <span class="comment">/***************************************************/</span>
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<a name="l00021"></a>00021 <span class="comment">/***************************************************/</span>
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<a name="l00022"></a>00022
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<a name="l00023"></a><a class="code" href="classstk_1_1JetTable.html">00023</a> <span class="keyword">class </span><a class="code" href="classstk_1_1JetTable.html" title="STK jet table class.">JetTable</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Function.html" title="STK abstract function parent class.">Function</a>
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<a name="l00024"></a>00024 {
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<a name="l00025"></a>00025 <span class="keyword">public</span>:
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<a name="l00026"></a>00026
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<a name="l00028"></a>00028 StkFloat <a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6" title="Take one sample input and map to one sample of output.">tick</a>( StkFloat input );
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<a name="l00029"></a>00029
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<a name="l00031"></a>00031
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<a name="l00039"></a>00039 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6" title="Take one sample input and map to one sample of output.">tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
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<a name="l00040"></a>00040
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<a name="l00042"></a>00042
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<a name="l00050"></a>00050 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6" title="Take one sample input and map to one sample of output.">tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& iFrames, <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> &oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel = 0, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel = 0 );
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<a name="l00051"></a>00051
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<a name="l00052"></a>00052 };
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<a name="l00053"></a>00053
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<a name="l00054"></a><a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6">00054</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6" title="Take one sample input and map to one sample of output.">JetTable :: tick</a>( StkFloat input )
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<a name="l00055"></a>00055 {
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<a name="l00056"></a>00056 <span class="comment">// Perform "table lookup" using a polynomial</span>
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<a name="l00057"></a>00057 <span class="comment">// calculation (x^3 - x), which approximates</span>
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<a name="l00058"></a>00058 <span class="comment">// the jet sigmoid behavior.</span>
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<a name="l00059"></a>00059 lastFrame_[0] = input * (input * input - 1.0);
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<a name="l00060"></a>00060
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<a name="l00061"></a>00061 <span class="comment">// Saturate at +/- 1.0.</span>
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<a name="l00062"></a>00062 <span class="keywordflow">if</span> ( lastFrame_[0] > 1.0 ) lastFrame_[0] = 1.0;
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<a name="l00063"></a>00063 <span class="keywordflow">if</span> ( lastFrame_[0] < -1.0 ) lastFrame_[0] = -1.0;
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<a name="l00064"></a>00064 <span class="keywordflow">return</span> lastFrame_[0];
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<a name="l00065"></a>00065 }
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<a name="l00066"></a>00066
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<a name="l00067"></a><a class="code" href="classstk_1_1JetTable.html#ae17ee82b1ed7b185713b4ae0b7c2b0cd">00067</a> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6" title="Take one sample input and map to one sample of output.">JetTable :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel )
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<a name="l00068"></a>00068 {
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<a name="l00069"></a>00069 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00070"></a>00070 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
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<a name="l00071"></a>00071 oStream_ << <span class="stringliteral">"JetTable::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00072"></a>00072 <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
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<a name="l00073"></a>00073 }
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<a name="l00074"></a>00074 <span class="preprocessor">#endif</span>
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<a name="l00075"></a>00075 <span class="preprocessor"></span>
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<a name="l00076"></a>00076 StkFloat *samples = &frames[channel];
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<a name="l00077"></a>00077 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>();
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<a name="l00078"></a>00078 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.<a class="code" href="classstk_1_1StkFrames.html#a05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, samples += hop ) {
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<a name="l00079"></a>00079 *samples = *samples * (*samples * *samples - 1.0);
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<a name="l00080"></a>00080 <span class="keywordflow">if</span> ( *samples > 1.0) *samples = 1.0;
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<a name="l00081"></a>00081 <span class="keywordflow">if</span> ( *samples < -1.0) *samples = -1.0;
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<a name="l00082"></a>00082 }
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<a name="l00083"></a>00083
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<a name="l00084"></a>00084 lastFrame_[0] = *(samples-hop);
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<a name="l00085"></a>00085 <span class="keywordflow">return</span> frames;
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<a name="l00086"></a>00086 }
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<a name="l00087"></a>00087
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<a name="l00088"></a><a class="code" href="classstk_1_1JetTable.html#a7b261fd07b2325348ef14e3f0ebf8429">00088</a> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& <a class="code" href="classstk_1_1JetTable.html#a3fb5333e6305abdeee7cd83a10ef76b6" title="Take one sample input and map to one sample of output.">JetTable :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& iFrames, <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>& oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel )
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<a name="l00089"></a>00089 {
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<a name="l00090"></a>00090 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00091"></a>00091 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() || oChannel >= oFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
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<a name="l00092"></a>00092 oStream_ << <span class="stringliteral">"JetTable::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00093"></a>00093 <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
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<a name="l00094"></a>00094 }
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<a name="l00095"></a>00095 <span class="preprocessor">#endif</span>
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<a name="l00096"></a>00096 <span class="preprocessor"></span>
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<a name="l00097"></a>00097 StkFloat *iSamples = &iFrames[iChannel];
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<a name="l00098"></a>00098 StkFloat *oSamples = &oFrames[oChannel];
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<a name="l00099"></a>00099 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>(), oHop = oFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>();
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<a name="l00100"></a>00100 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<iFrames.<a class="code" href="classstk_1_1StkFrames.html#a05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, iSamples += iHop, oSamples += oHop ) {
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<a name="l00101"></a>00101 *oSamples = *oSamples * (*oSamples * *oSamples - 1.0);
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<a name="l00102"></a>00102 <span class="keywordflow">if</span> ( *oSamples > 1.0) *oSamples = 1.0;
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<a name="l00103"></a>00103 <span class="keywordflow">if</span> ( *oSamples < -1.0) *oSamples = -1.0;
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<a name="l00104"></a>00104 }
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<a name="l00105"></a>00105
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<a name="l00106"></a>00106 lastFrame_[0] = *(oSamples-oHop);
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<a name="l00107"></a>00107 <span class="keywordflow">return</span> iFrames;
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<a name="l00108"></a>00108 }
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<a name="l00109"></a>00109
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<a name="l00110"></a>00110 } <span class="comment">// stk namespace</span>
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<a name="l00111"></a>00111
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<a name="l00112"></a>00112 <span class="preprocessor">#endif</span>
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</pre></div></div>
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<table>
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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>
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<tr><td>©1995-2011 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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</table>
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