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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<h1>BowTable.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_BOWTABL_H</span>
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<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_BOWTABL_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 <span class="preprocessor">#include <cmath></span>
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<a name="l00006"></a>00006
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<a name="l00007"></a>00007 <span class="keyword">namespace </span>stk {
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<a name="l00008"></a>00008
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<a name="l00009"></a>00009 <span class="comment">/***************************************************/</span>
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<a name="l00020"></a>00020 <span class="comment">/***************************************************/</span>
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<a name="l00021"></a>00021
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<a name="l00022"></a><a class="code" href="classstk_1_1BowTable.html">00022</a> <span class="keyword">class </span><a class="code" href="classstk_1_1BowTable.html" title="STK bowed string table class.">BowTable</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="l00023"></a>00023 {
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<a name="l00024"></a>00024 <span class="keyword">public</span>:
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<a name="l00026"></a><a class="code" href="classstk_1_1BowTable.html#a25d0985fd6821a7e1608af1e8f51952a">00026</a> <a class="code" href="classstk_1_1BowTable.html#a25d0985fd6821a7e1608af1e8f51952a" title="Default constructor.">BowTable</a>( <span class="keywordtype">void</span> ) : offset_(0.0), slope_(0.1), minOutput_(0.01), maxOutput_(0.98) {};
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<a name="l00027"></a>00027
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<a name="l00029"></a>00029
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<a name="l00035"></a><a class="code" href="classstk_1_1BowTable.html#a9adcc3c36085b73d3b877828071a3b2c">00035</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BowTable.html#a9adcc3c36085b73d3b877828071a3b2c" title="Set the table offset value.">setOffset</a>( StkFloat offset ) { offset_ = offset; };
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<a name="l00036"></a>00036
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<a name="l00038"></a>00038
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<a name="l00042"></a><a class="code" href="classstk_1_1BowTable.html#ad8391e46941ff9f49b78bf4f77c35143">00042</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BowTable.html#ad8391e46941ff9f49b78bf4f77c35143" title="Set the table slope value.">setSlope</a>( StkFloat slope ) { slope_ = slope; };
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<a name="l00043"></a>00043
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<a name="l00045"></a><a class="code" href="classstk_1_1BowTable.html#a9540d5c56cfd4556ab25c25f0612b25d">00045</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BowTable.html#a9540d5c56cfd4556ab25c25f0612b25d" title="Set the minimum table output value (0.0 - 1.0).">setMinOutput</a>( StkFloat minimum ) { minOutput_ = minimum; };
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<a name="l00046"></a>00046
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<a name="l00048"></a><a class="code" href="classstk_1_1BowTable.html#a634d5063eba886445f4057c823b00ff7">00048</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BowTable.html#a634d5063eba886445f4057c823b00ff7" title="Set the maximum table output value (0.0 - 1.0).">setMaxOutput</a>( StkFloat maximum ) { maxOutput_ = maximum; };
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<a name="l00049"></a>00049
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<a name="l00051"></a>00051 StkFloat <a class="code" href="classstk_1_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" title="Take one sample input and map to one sample of output.">tick</a>( StkFloat input );
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<a name="l00052"></a>00052
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<a name="l00054"></a>00054
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<a name="l00062"></a>00062 <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_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" 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="l00063"></a>00063
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<a name="l00065"></a>00065
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<a name="l00073"></a>00073 <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_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" 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="l00074"></a>00074
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<a name="l00075"></a>00075 <span class="keyword">protected</span>:
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<a name="l00076"></a>00076
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<a name="l00077"></a>00077 StkFloat offset_;
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<a name="l00078"></a>00078 StkFloat slope_;
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<a name="l00079"></a>00079 StkFloat minOutput_;
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<a name="l00080"></a>00080 StkFloat maxOutput_;
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<a name="l00081"></a>00081
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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><a class="code" href="classstk_1_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19">00084</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" title="Take one sample input and map to one sample of output.">BowTable :: tick</a>( StkFloat input )
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<a name="l00085"></a>00085 {
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<a name="l00086"></a>00086 <span class="comment">// The input represents differential string vs. bow velocity.</span>
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<a name="l00087"></a>00087 StkFloat sample = input + offset_; <span class="comment">// add bias to input</span>
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<a name="l00088"></a>00088 sample *= slope_; <span class="comment">// then scale it</span>
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<a name="l00089"></a>00089 lastFrame_[0] = (StkFloat) fabs( (<span class="keywordtype">double</span>) sample ) + (StkFloat) 0.75;
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<a name="l00090"></a>00090 lastFrame_[0] = (StkFloat) pow( lastFrame_[0], (StkFloat) -4.0 );
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<a name="l00091"></a>00091
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<a name="l00092"></a>00092 <span class="comment">// Set minimum threshold</span>
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<a name="l00093"></a>00093 <span class="keywordflow">if</span> ( lastFrame_[0] < minOutput_ ) lastFrame_[0] = minOutput_;
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<a name="l00094"></a>00094
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<a name="l00095"></a>00095 <span class="comment">// Set maximum threshold</span>
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<a name="l00096"></a>00096 <span class="keywordflow">if</span> ( lastFrame_[0] > maxOutput_ ) lastFrame_[0] = maxOutput_;
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098 <span class="keywordflow">return</span> lastFrame_[0];
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<a name="l00099"></a>00099 }
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<a name="l00100"></a>00100
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<a name="l00101"></a><a class="code" href="classstk_1_1BowTable.html#a8ad2766def014b62dcbbd8765e133246">00101</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_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" title="Take one sample input and map to one sample of output.">BowTable :: 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="l00102"></a>00102 {
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<a name="l00103"></a>00103 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00104"></a>00104 <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="l00105"></a>00105 oStream_ << <span class="stringliteral">"BowTable::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00106"></a>00106 <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="l00107"></a>00107 }
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<a name="l00108"></a>00108 <span class="preprocessor">#endif</span>
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<a name="l00109"></a>00109 <span class="preprocessor"></span>
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<a name="l00110"></a>00110 StkFloat *samples = &frames[channel];
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<a name="l00111"></a>00111 <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="l00112"></a>00112 <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="l00113"></a>00113 *samples = *samples + offset_;
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<a name="l00114"></a>00114 *samples *= slope_;
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<a name="l00115"></a>00115 *samples = (StkFloat) fabs( (<span class="keywordtype">double</span>) *samples ) + 0.75;
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<a name="l00116"></a>00116 *samples = (StkFloat) pow( *samples, (StkFloat) -4.0 );
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<a name="l00117"></a>00117 <span class="keywordflow">if</span> ( *samples > 1.0) *samples = 1.0;
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<a name="l00118"></a>00118 }
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<a name="l00119"></a>00119
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<a name="l00120"></a>00120 lastFrame_[0] = *(samples-hop);
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<a name="l00121"></a>00121 <span class="keywordflow">return</span> frames;
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<a name="l00122"></a>00122 }
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<a name="l00123"></a>00123
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<a name="l00124"></a><a class="code" href="classstk_1_1BowTable.html#aaf72f823f210b18f417337ac7181cde5">00124</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_1BowTable.html#a8dc58c69ecda1471dce6d142cb5f4b19" title="Take one sample input and map to one sample of output.">BowTable :: 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="l00125"></a>00125 {
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<a name="l00126"></a>00126 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00127"></a>00127 <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="l00128"></a>00128 oStream_ << <span class="stringliteral">"BowTable::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00129"></a>00129 <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="l00130"></a>00130 }
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<a name="l00131"></a>00131 <span class="preprocessor">#endif</span>
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<a name="l00132"></a>00132 <span class="preprocessor"></span>
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<a name="l00133"></a>00133 StkFloat *iSamples = &iFrames[iChannel];
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<a name="l00134"></a>00134 StkFloat *oSamples = &oFrames[oChannel];
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<a name="l00135"></a>00135 <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="l00136"></a>00136 <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="l00137"></a>00137 *oSamples = *iSamples + offset_;
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<a name="l00138"></a>00138 *oSamples *= slope_;
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<a name="l00139"></a>00139 *oSamples = (StkFloat) fabs( (<span class="keywordtype">double</span>) *oSamples ) + 0.75;
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<a name="l00140"></a>00140 *oSamples = (StkFloat) pow( *oSamples, (StkFloat) -4.0 );
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<a name="l00141"></a>00141 <span class="keywordflow">if</span> ( *oSamples > 1.0) *oSamples = 1.0;
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<a name="l00142"></a>00142 }
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<a name="l00143"></a>00143
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<a name="l00144"></a>00144 lastFrame_[0] = *(oSamples-oHop);
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<a name="l00145"></a>00145 <span class="keywordflow">return</span> iFrames;
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<a name="l00146"></a>00146 }
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<a name="l00147"></a>00147
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<a name="l00148"></a>00148 } <span class="comment">// stk namespace</span>
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<a name="l00149"></a>00149
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<a name="l00150"></a>00150 <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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