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<h1>TwoZero.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_TWOZERO_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_TWOZERO_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "Filter.h"</span>
<a name="l00005"></a>00005
<a name="l00006"></a>00006 <span class="keyword">namespace </span>stk {
<a name="l00007"></a>00007
<a name="l00008"></a>00008 <span class="comment">/***************************************************/</span>
<a name="l00018"></a>00018 <span class="comment">/***************************************************/</span>
<a name="l00019"></a>00019
<a name="l00020"></a><a class="code" href="classstk_1_1TwoZero.html">00020</a> <span class="keyword">class </span><a class="code" href="classstk_1_1TwoZero.html" title="STK two-zero filter class.">TwoZero</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Filter.html" title="STK abstract filter class.">Filter</a>
<a name="l00021"></a>00021 {
<a name="l00022"></a>00022 <span class="keyword">public</span>:
<a name="l00024"></a>00024 <a class="code" href="classstk_1_1TwoZero.html#5dabe7ec659bedf76a8f8d975f36dcd9" title="Default constructor creates a second-order pass-through filter.">TwoZero</a>();
<a name="l00025"></a>00025
<a name="l00027"></a>00027 <a class="code" href="classstk_1_1TwoZero.html#b9890b28f0770485494b05639a4b2140" title="Class destructor.">~TwoZero</a>();
<a name="l00028"></a>00028
<a name="l00030"></a><a class="code" href="classstk_1_1TwoZero.html#a1a1568aae3cd3d53011b3fc344cb086">00030</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1TwoZero.html#a1a1568aae3cd3d53011b3fc344cb086" title="A function to enable/disable the automatic updating of class data when the STK sample...">ignoreSampleRateChange</a>( <span class="keywordtype">bool</span> ignore = <span class="keyword">true</span> ) { ignoreSampleRateChange_ = ignore; };
<a name="l00031"></a>00031
<a name="l00033"></a><a class="code" href="classstk_1_1TwoZero.html#5ac82173333659fc31ca86cd2e134413">00033</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1TwoZero.html#5ac82173333659fc31ca86cd2e134413" title="Set the b[0] coefficient value.">setB0</a>( StkFloat b0 ) { b_[0] = b0; };
<a name="l00034"></a>00034
<a name="l00036"></a><a class="code" href="classstk_1_1TwoZero.html#1f090992845b9c85f3de15dfba583891">00036</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1TwoZero.html#1f090992845b9c85f3de15dfba583891" title="Set the b[1] coefficient value.">setB1</a>( StkFloat b1 ) { b_[1] = b1; };
<a name="l00037"></a>00037
<a name="l00039"></a><a class="code" href="classstk_1_1TwoZero.html#98a7d6d1615753f338f75409d850a9b4">00039</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1TwoZero.html#98a7d6d1615753f338f75409d850a9b4" title="Set the b[2] coefficient value.">setB2</a>( StkFloat b2 ) { b_[2] = b2; };
<a name="l00040"></a>00040
<a name="l00042"></a>00042 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1TwoZero.html#3c8449660561108eb1873ca6b820a939" title="Set all filter coefficients.">setCoefficients</a>( StkFloat b0, StkFloat b1, StkFloat b2, <span class="keywordtype">bool</span> clearState = <span class="keyword">false</span> );
<a name="l00043"></a>00043
<a name="l00045"></a>00045
<a name="l00055"></a>00055 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1TwoZero.html#3a89facd2b94bbcfc2f06d8766a46329" title="Sets the filter coefficients for a &amp;quot;notch&amp;quot; at frequency (in Hz).">setNotch</a>( StkFloat frequency, StkFloat radius );
<a name="l00056"></a>00056
<a name="l00058"></a><a class="code" href="classstk_1_1TwoZero.html#e9808b0152902d0067ea24ccfba0b4ba">00058</a> StkFloat <a class="code" href="classstk_1_1TwoZero.html#e9808b0152902d0067ea24ccfba0b4ba" title="Return the last computed output value.">lastOut</a>( <span class="keywordtype">void</span> )<span class="keyword"> const </span>{ <span class="keywordflow">return</span> lastFrame_[0]; };
<a name="l00059"></a>00059
<a name="l00061"></a>00061 StkFloat <a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82" title="Input one sample to the filter and return one output.">tick</a>( StkFloat input );
<a name="l00062"></a>00062
<a name="l00064"></a>00064
<a name="l00072"></a>00072 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; <a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82" title="Input one sample to the filter and return one output.">tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
<a name="l00073"></a>00073
<a name="l00075"></a>00075
<a name="l00083"></a>00083 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; <a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82" title="Input one sample to the filter and return one output.">tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; iFrames, <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> &amp;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 );
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="keyword">protected</span>:
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="keywordtype">void</span> sampleRateChanged( StkFloat newRate, StkFloat oldRate );
<a name="l00088"></a>00088 };
<a name="l00089"></a>00089
<a name="l00090"></a><a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82">00090</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82" title="Input one sample to the filter and return one output.">TwoZero :: tick</a>( StkFloat input )
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092 inputs_[0] = gain_ * input;
<a name="l00093"></a>00093 lastFrame_[0] = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
<a name="l00094"></a>00094 inputs_[2] = inputs_[1];
<a name="l00095"></a>00095 inputs_[1] = inputs_[0];
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="keywordflow">return</span> lastFrame_[0];
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099
<a name="l00100"></a><a class="code" href="classstk_1_1TwoZero.html#26e2a1e21831ccb414dbede864afc63c">00100</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>&amp; <a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82" title="Input one sample to the filter and return one output.">TwoZero :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel )
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00103"></a>00103 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel &gt;= frames.<a class="code" href="classstk_1_1StkFrames.html#ec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
<a name="l00104"></a>00104 errorString_ &lt;&lt; <span class="stringliteral">"TwoZero::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00105"></a>00105 <a class="code" href="classstk_1_1Stk.html#48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107 <span class="preprocessor">#endif</span>
<a name="l00108"></a>00108 <span class="preprocessor"></span>
<a name="l00109"></a>00109 StkFloat *samples = &amp;frames[channel];
<a name="l00110"></a>00110 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.<a class="code" href="classstk_1_1StkFrames.html#ec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>();
<a name="l00111"></a>00111 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i&lt;frames.<a class="code" href="classstk_1_1StkFrames.html#05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, samples += hop ) {
<a name="l00112"></a>00112 inputs_[0] = gain_ * *samples;
<a name="l00113"></a>00113 *samples = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
<a name="l00114"></a>00114 inputs_[2] = inputs_[1];
<a name="l00115"></a>00115 inputs_[1] = inputs_[0];
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117
<a name="l00118"></a>00118 lastFrame_[0] = *(samples-hop);
<a name="l00119"></a>00119 <span class="keywordflow">return</span> frames;
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121
<a name="l00122"></a><a class="code" href="classstk_1_1TwoZero.html#0ef9deab4fbc7e64511d4b6d38afd185">00122</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>&amp; <a class="code" href="classstk_1_1TwoZero.html#cf92a66aeb2024cfcdb9d71ecadf3d82" title="Input one sample to the filter and return one output.">TwoZero :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; iFrames, <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a>&amp; oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel )
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00125"></a>00125 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel &gt;= iFrames.<a class="code" href="classstk_1_1StkFrames.html#ec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() || oChannel &gt;= oFrames.<a class="code" href="classstk_1_1StkFrames.html#ec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
<a name="l00126"></a>00126 errorString_ &lt;&lt; <span class="stringliteral">"TwoZero::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00127"></a>00127 <a class="code" href="classstk_1_1Stk.html#48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 <span class="preprocessor">#endif</span>
<a name="l00130"></a>00130 <span class="preprocessor"></span>
<a name="l00131"></a>00131 StkFloat *iSamples = &amp;iFrames[iChannel];
<a name="l00132"></a>00132 StkFloat *oSamples = &amp;oFrames[oChannel];
<a name="l00133"></a>00133 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.<a class="code" href="classstk_1_1StkFrames.html#ec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>(), oHop = oFrames.<a class="code" href="classstk_1_1StkFrames.html#ec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>();
<a name="l00134"></a>00134 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i&lt;iFrames.<a class="code" href="classstk_1_1StkFrames.html#05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, iSamples += iHop, oSamples += oHop ) {
<a name="l00135"></a>00135 inputs_[0] = gain_ * *iSamples;
<a name="l00136"></a>00136 *oSamples = b_[2] * inputs_[2] + b_[1] * inputs_[1] + b_[0] * inputs_[0];
<a name="l00137"></a>00137 inputs_[2] = inputs_[1];
<a name="l00138"></a>00138 inputs_[1] = inputs_[0];
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140
<a name="l00141"></a>00141 lastFrame_[0] = *(oSamples-oHop);
<a name="l00142"></a>00142 <span class="keywordflow">return</span> iFrames;
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144
<a name="l00145"></a>00145 } <span class="comment">// stk namespace</span>
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="preprocessor">#endif</span>
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