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<h1>FormSwep.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_FORMSWEP_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_FORMSWEP_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include &quot;Filter.h&quot;</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_1FormSwep.html">00020</a> <span class="keyword">class </span><a class="code" href="classstk_1_1FormSwep.html" title="STK sweepable formant filter class.">FormSwep</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="l00023"></a>00023
<a name="l00025"></a>00025 <a class="code" href="classstk_1_1FormSwep.html#aeb0093d5962acf4b5d582730e8c8bab9" title="Default constructor creates a second-order pass-through filter.">FormSwep</a>( <span class="keywordtype">void</span> );
<a name="l00026"></a>00026
<a name="l00028"></a>00028 <a class="code" href="classstk_1_1FormSwep.html#ac02cd2882f67e8ed9c315dfbf10b05a9" title="Class destructor.">~FormSwep</a>();
<a name="l00029"></a>00029
<a name="l00031"></a><a class="code" href="classstk_1_1FormSwep.html#a91096ebd684df25fc36a759f642b2200">00031</a> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1FormSwep.html#a91096ebd684df25fc36a759f642b2200" 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="l00032"></a>00032
<a name="l00034"></a>00034
<a name="l00047"></a>00047 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1FormSwep.html#aa6fe339cc937260c46e8c169a58d8529" title="Sets the filter coefficients for a resonance at frequency (in Hz).">setResonance</a>( StkFloat frequency, StkFloat radius );
<a name="l00048"></a>00048
<a name="l00050"></a>00050 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1FormSwep.html#a3aede7b088dbe2ca98b3398a5f953ae7" title="Set both the current and target resonance parameters.">setStates</a>( StkFloat frequency, StkFloat radius, StkFloat gain = 1.0 );
<a name="l00051"></a>00051
<a name="l00053"></a>00053 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1FormSwep.html#a2f00d2edf80fbf8f74a284c68caf07d6" title="Set target resonance parameters.">setTargets</a>( StkFloat frequency, StkFloat radius, StkFloat gain = 1.0 );
<a name="l00054"></a>00054
<a name="l00056"></a>00056
<a name="l00064"></a>00064 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1FormSwep.html#a27ba31acdbe8334da1830e14872fd226" title="Set the sweep rate (between 0.0 - 1.0).">setSweepRate</a>( StkFloat rate );
<a name="l00065"></a>00065
<a name="l00067"></a>00067
<a name="l00072"></a>00072 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1FormSwep.html#a242edcbe2a6f88393357b5a5ccec43e8" title="Set the sweep rate in terms of a time value in seconds.">setSweepTime</a>( StkFloat time );
<a name="l00073"></a>00073
<a name="l00075"></a><a class="code" href="classstk_1_1FormSwep.html#a3d8405c24e8539b389daf86fccfe5d70">00075</a> StkFloat <a class="code" href="classstk_1_1FormSwep.html#a3d8405c24e8539b389daf86fccfe5d70" 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="l00076"></a>00076
<a name="l00078"></a>00078 StkFloat <a class="code" href="classstk_1_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to one output.">tick</a>( StkFloat input );
<a name="l00079"></a>00079
<a name="l00081"></a>00081
<a name="l00089"></a>00089 <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_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to 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="l00090"></a>00090
<a name="l00092"></a>00092
<a name="l00100"></a>00100 <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_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to 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="l00101"></a>00101
<a name="l00102"></a>00102 <span class="keyword">protected</span>:
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="keyword">virtual</span> <span class="keywordtype">void</span> sampleRateChanged( StkFloat newRate, StkFloat oldRate );
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keywordtype">bool</span> dirty_;
<a name="l00107"></a>00107 StkFloat frequency_;
<a name="l00108"></a>00108 StkFloat radius_;
<a name="l00109"></a>00109 StkFloat startFrequency_;
<a name="l00110"></a>00110 StkFloat startRadius_;
<a name="l00111"></a>00111 StkFloat startGain_;
<a name="l00112"></a>00112 StkFloat targetFrequency_;
<a name="l00113"></a>00113 StkFloat targetRadius_;
<a name="l00114"></a>00114 StkFloat targetGain_;
<a name="l00115"></a>00115 StkFloat deltaFrequency_;
<a name="l00116"></a>00116 StkFloat deltaRadius_;
<a name="l00117"></a>00117 StkFloat deltaGain_;
<a name="l00118"></a>00118 StkFloat sweepState_;
<a name="l00119"></a>00119 StkFloat sweepRate_;
<a name="l00120"></a>00120
<a name="l00121"></a>00121 };
<a name="l00122"></a>00122
<a name="l00123"></a><a class="code" href="classstk_1_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774">00123</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to one output.">FormSwep :: tick</a>( StkFloat input )
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 <span class="keywordflow">if</span> ( dirty_ ) {
<a name="l00126"></a>00126 sweepState_ += sweepRate_;
<a name="l00127"></a>00127 <span class="keywordflow">if</span> ( sweepState_ &gt;= 1.0 ) {
<a name="l00128"></a>00128 sweepState_ = 1.0;
<a name="l00129"></a>00129 dirty_ = <span class="keyword">false</span>;
<a name="l00130"></a>00130 radius_ = targetRadius_;
<a name="l00131"></a>00131 frequency_ = targetFrequency_;
<a name="l00132"></a>00132 gain_ = targetGain_;
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 <span class="keywordflow">else</span> {
<a name="l00135"></a>00135 radius_ = startRadius_ + (deltaRadius_ * sweepState_);
<a name="l00136"></a>00136 frequency_ = startFrequency_ + (deltaFrequency_ * sweepState_);
<a name="l00137"></a>00137 gain_ = startGain_ + (deltaGain_ * sweepState_);
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 this-&gt;<a class="code" href="classstk_1_1FormSwep.html#aa6fe339cc937260c46e8c169a58d8529" title="Sets the filter coefficients for a resonance at frequency (in Hz).">setResonance</a>( frequency_, radius_ );
<a name="l00140"></a>00140 }
<a name="l00141"></a>00141
<a name="l00142"></a>00142 inputs_[0] = gain_ * input;
<a name="l00143"></a>00143 lastFrame_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
<a name="l00144"></a>00144 lastFrame_[0] -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
<a name="l00145"></a>00145 inputs_[2] = inputs_[1];
<a name="l00146"></a>00146 inputs_[1] = inputs_[0];
<a name="l00147"></a>00147 outputs_[2] = outputs_[1];
<a name="l00148"></a>00148 outputs_[1] = lastFrame_[0];
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="keywordflow">return</span> lastFrame_[0];
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a><a class="code" href="classstk_1_1FormSwep.html#a27f68dc2bb3fa41322ae49cf59cc9884">00153</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_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to one output.">FormSwep :: 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="l00154"></a>00154 {
<a name="l00155"></a>00155 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00156"></a>00156 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel &gt;= frames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
<a name="l00157"></a>00157 oStream_ &lt;&lt; <span class="stringliteral">&quot;FormSwep::tick(): channel and StkFrames arguments are incompatible!&quot;</span>;
<a name="l00158"></a>00158 <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 );
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 <span class="preprocessor">#endif</span>
<a name="l00161"></a>00161 <span class="preprocessor"></span>
<a name="l00162"></a>00162 StkFloat *samples = &amp;frames[channel];
<a name="l00163"></a>00163 <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>();
<a name="l00164"></a>00164 <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#a05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, samples += hop )
<a name="l00165"></a>00165 *samples = <a class="code" href="classstk_1_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to one output.">tick</a>( *samples );
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="keywordflow">return</span> frames;
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169
<a name="l00170"></a><a class="code" href="classstk_1_1FormSwep.html#a8a16af2b4e169946cedb8fec2bb1417a">00170</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_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to one output.">FormSwep :: 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="l00171"></a>00171 {
<a name="l00172"></a>00172 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00173"></a>00173 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel &gt;= iFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() || oChannel &gt;= oFrames.<a class="code" href="classstk_1_1StkFrames.html#aec7ef9c46675a24111aa6e2fda3ba870" title="Return the number of channels represented by the data.">channels</a>() ) {
<a name="l00174"></a>00174 oStream_ &lt;&lt; <span class="stringliteral">&quot;FormSwep::tick(): channel and StkFrames arguments are incompatible!&quot;</span>;
<a name="l00175"></a>00175 <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 );
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177 <span class="preprocessor">#endif</span>
<a name="l00178"></a>00178 <span class="preprocessor"></span>
<a name="l00179"></a>00179 StkFloat *iSamples = &amp;iFrames[iChannel];
<a name="l00180"></a>00180 StkFloat *oSamples = &amp;oFrames[oChannel];
<a name="l00181"></a>00181 <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>();
<a name="l00182"></a>00182 <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#a05b1ab6fa750a8221a7d65c30e0cdab9" title="Return the number of sample frames represented by the data.">frames</a>(); i++, iSamples += iHop, oSamples += oHop )
<a name="l00183"></a>00183 *oSamples = <a class="code" href="classstk_1_1FormSwep.html#aba0d15e1d102cb0fee0806e1bb05c774" title="Input one sample to the filter and return a reference to one output.">tick</a>( *iSamples );
<a name="l00184"></a>00184
<a name="l00185"></a>00185 <span class="keywordflow">return</span> iFrames;
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187
<a name="l00188"></a>00188 } <span class="comment">// stk namespace</span>
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="preprocessor">#endif</span>
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