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<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
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<h1>DelayL.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_DELAYL_H</span>
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<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_DELAYL_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 "Delay.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="l00025"></a>00025 <span class="comment">/***************************************************/</span>
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<a name="l00026"></a>00026
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<a name="l00027"></a><a class="code" href="classstk_1_1DelayL.html">00027</a> <span class="keyword">class </span><a class="code" href="classstk_1_1DelayL.html" title="STK linear interpolating delay line class.">DelayL</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Filter.html" title="STK abstract filter class.">Filter</a>
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<a name="l00028"></a>00028 {
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<a name="l00029"></a>00029 <span class="keyword">public</span>:
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<a name="l00030"></a>00030
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<a name="l00032"></a>00032
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<a name="l00037"></a>00037 <a class="code" href="classstk_1_1DelayL.html#ad60f2222397e19fe524fc3b76b59b846" title="Default constructor creates a delay-line with maximum length of 4095 samples and...">DelayL</a>( StkFloat delay = 0.0, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> maxDelay = 4095 );
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<a name="l00038"></a>00038
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<a name="l00040"></a>00040 <a class="code" href="classstk_1_1DelayL.html#a8f9b49c7b098d9e379baf44b0c345457" title="Class destructor.">~DelayL</a>();
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<a name="l00041"></a>00041
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<a name="l00043"></a><a class="code" href="classstk_1_1DelayL.html#acbcb8326db134a26fdad5f16f1a0ba7e">00043</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="classstk_1_1DelayL.html#acbcb8326db134a26fdad5f16f1a0ba7e" title="Get the maximum delay-line length.">getMaximumDelay</a>( <span class="keywordtype">void</span> ) { <span class="keywordflow">return</span> inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() - 1; };
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<a name="l00044"></a>00044
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<a name="l00046"></a>00046
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<a name="l00053"></a>00053 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1DelayL.html#a18b40806591654a9c9c32603990fce40" title="Set the maximum delay-line length.">setMaximumDelay</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> delay );
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<a name="l00054"></a>00054
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<a name="l00056"></a>00056
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<a name="l00059"></a>00059 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1DelayL.html#a80dd30628502a7c3b37ff045176eb91f" title="Set the delay-line length.">setDelay</a>( StkFloat delay );
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<a name="l00060"></a>00060
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<a name="l00062"></a><a class="code" href="classstk_1_1DelayL.html#aaf2d5ef7dba47ff1fb279c327021beb0">00062</a> StkFloat <a class="code" href="classstk_1_1DelayL.html#aaf2d5ef7dba47ff1fb279c327021beb0" title="Return the current delay-line length.">getDelay</a>( <span class="keywordtype">void</span> )<span class="keyword"> const </span>{ <span class="keywordflow">return</span> delay_; };
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<a name="l00063"></a>00063
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<a name="l00065"></a>00065
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<a name="l00070"></a>00070 StkFloat <a class="code" href="classstk_1_1DelayL.html#ad16a1f176e93a9beb8e685aafa32579e" title="Return the value at tapDelay samples from the delay-line input.">tapOut</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> tapDelay );
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<a name="l00071"></a>00071
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<a name="l00073"></a>00073 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1DelayL.html#a984843567ba3de6543bd13c23457f495" title="Set the value at tapDelay samples from the delay-line input.">tapIn</a>( StkFloat value, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> tapDelay );
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<a name="l00074"></a>00074
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<a name="l00076"></a><a class="code" href="classstk_1_1DelayL.html#a16810ca38fab79276bb8ec51447623a9">00076</a> StkFloat <a class="code" href="classstk_1_1DelayL.html#a16810ca38fab79276bb8ec51447623a9" 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]; };
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<a name="l00077"></a>00077
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<a name="l00079"></a>00079
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<a name="l00082"></a>00082 StkFloat <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">nextOut</a>( <span class="keywordtype">void</span> );
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<a name="l00083"></a>00083
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<a name="l00085"></a>00085 StkFloat <a class="code" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">tick</a>( StkFloat input );
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<a name="l00086"></a>00086
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<a name="l00088"></a>00088
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<a name="l00096"></a>00096 <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_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" 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>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );
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<a name="l00097"></a>00097
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<a name="l00099"></a>00099
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<a name="l00107"></a>00107 <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_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" 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>& 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="l00108"></a>00108
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<a name="l00109"></a>00109 <span class="keyword">protected</span>:
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<a name="l00110"></a>00110
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<a name="l00111"></a>00111 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> inPoint_;
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<a name="l00112"></a>00112 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> outPoint_;
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<a name="l00113"></a>00113 StkFloat delay_;
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<a name="l00114"></a>00114 StkFloat alpha_;
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<a name="l00115"></a>00115 StkFloat omAlpha_;
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<a name="l00116"></a>00116 StkFloat nextOutput_;
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<a name="l00117"></a>00117 <span class="keywordtype">bool</span> doNextOut_;
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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><a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8">00120</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">DelayL :: nextOut</a>( <span class="keywordtype">void</span> )
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<a name="l00121"></a>00121 {
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<a name="l00122"></a>00122 <span class="keywordflow">if</span> ( doNextOut_ ) {
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<a name="l00123"></a>00123 <span class="comment">// First 1/2 of interpolation</span>
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<a name="l00124"></a>00124 nextOutput_ = inputs_[outPoint_] * omAlpha_;
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<a name="l00125"></a>00125 <span class="comment">// Second 1/2 of interpolation</span>
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<a name="l00126"></a>00126 <span class="keywordflow">if</span> (outPoint_+1 < inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>())
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<a name="l00127"></a>00127 nextOutput_ += inputs_[outPoint_+1] * alpha_;
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<a name="l00128"></a>00128 <span class="keywordflow">else</span>
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<a name="l00129"></a>00129 nextOutput_ += inputs_[0] * alpha_;
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<a name="l00130"></a>00130 doNextOut_ = <span class="keyword">false</span>;
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<a name="l00131"></a>00131 }
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<a name="l00132"></a>00132
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<a name="l00133"></a>00133 <span class="keywordflow">return</span> nextOutput_;
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<a name="l00134"></a>00134 }
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<a name="l00135"></a>00135
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<a name="l00136"></a><a class="code" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f">00136</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">DelayL :: tick</a>( StkFloat input )
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<a name="l00137"></a>00137 {
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<a name="l00138"></a>00138 inputs_[inPoint_++] = input * gain_;
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<a name="l00139"></a>00139
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<a name="l00140"></a>00140 <span class="comment">// Increment input pointer modulo length.</span>
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<a name="l00141"></a>00141 <span class="keywordflow">if</span> ( inPoint_ == inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() )
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<a name="l00142"></a>00142 inPoint_ = 0;
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<a name="l00143"></a>00143
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<a name="l00144"></a>00144 lastFrame_[0] = <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">nextOut</a>();
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<a name="l00145"></a>00145 doNextOut_ = <span class="keyword">true</span>;
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<a name="l00146"></a>00146
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<a name="l00147"></a>00147 <span class="comment">// Increment output pointer modulo length.</span>
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<a name="l00148"></a>00148 <span class="keywordflow">if</span> ( ++outPoint_ == inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() )
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<a name="l00149"></a>00149 outPoint_ = 0;
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<a name="l00150"></a>00150
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<a name="l00151"></a>00151 <span class="keywordflow">return</span> lastFrame_[0];
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<a name="l00152"></a>00152 }
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<a name="l00153"></a>00153
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<a name="l00154"></a><a class="code" href="classstk_1_1DelayL.html#acdc5d41de53c53d9d4b39ee8a46fb96c">00154</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_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">DelayL :: 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="l00155"></a>00155 {
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<a name="l00156"></a>00156 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00157"></a>00157 <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="l00158"></a>00158 oStream_ << <span class="stringliteral">"DelayL::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00159"></a>00159 <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="l00160"></a>00160 }
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<a name="l00161"></a>00161 <span class="preprocessor">#endif</span>
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<a name="l00162"></a>00162 <span class="preprocessor"></span>
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<a name="l00163"></a>00163 StkFloat *samples = &frames[channel];
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<a name="l00164"></a>00164 <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="l00165"></a>00165 <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="l00166"></a>00166 inputs_[inPoint_++] = *samples * gain_;
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<a name="l00167"></a>00167 <span class="keywordflow">if</span> ( inPoint_ == inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() ) inPoint_ = 0;
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<a name="l00168"></a>00168 *samples = <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">nextOut</a>();
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<a name="l00169"></a>00169 doNextOut_ = <span class="keyword">true</span>;
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<a name="l00170"></a>00170 <span class="keywordflow">if</span> ( ++outPoint_ == inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() ) outPoint_ = 0;
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<a name="l00171"></a>00171 }
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<a name="l00172"></a>00172
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<a name="l00173"></a>00173 lastFrame_[0] = *(samples-hop);
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<a name="l00174"></a>00174 <span class="keywordflow">return</span> frames;
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<a name="l00175"></a>00175 }
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<a name="l00176"></a>00176
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<a name="l00177"></a><a class="code" href="classstk_1_1DelayL.html#a56ee486fb01fbf45d5a3dbad754a838e">00177</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_1DelayL.html#a1d01bbaf40cc20a0b70241bb8072da7f" title="Input one sample to the filter and return one output.">DelayL :: 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="l00178"></a>00178 {
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<a name="l00179"></a>00179 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
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<a name="l00180"></a>00180 <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="l00181"></a>00181 oStream_ << <span class="stringliteral">"DelayL::tick(): channel and StkFrames arguments are incompatible!"</span>;
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<a name="l00182"></a>00182 <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="l00183"></a>00183 }
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<a name="l00184"></a>00184 <span class="preprocessor">#endif</span>
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<a name="l00185"></a>00185 <span class="preprocessor"></span>
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<a name="l00186"></a>00186 StkFloat *iSamples = &iFrames[iChannel];
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<a name="l00187"></a>00187 StkFloat *oSamples = &oFrames[oChannel];
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<a name="l00188"></a>00188 <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="l00189"></a>00189 <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="l00190"></a>00190 inputs_[inPoint_++] = *iSamples * gain_;
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<a name="l00191"></a>00191 <span class="keywordflow">if</span> ( inPoint_ == inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() ) inPoint_ = 0;
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<a name="l00192"></a>00192 *oSamples = <a class="code" href="classstk_1_1DelayL.html#abfe69d19690fab75b6026dab96870fb8" title="Return the value which will be output by the next call to tick().">nextOut</a>();
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<a name="l00193"></a>00193 doNextOut_ = <span class="keyword">true</span>;
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<a name="l00194"></a>00194 <span class="keywordflow">if</span> ( ++outPoint_ == inputs_.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() ) outPoint_ = 0;
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<a name="l00195"></a>00195 }
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<a name="l00196"></a>00196
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<a name="l00197"></a>00197 lastFrame_[0] = *(oSamples-oHop);
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<a name="l00198"></a>00198 <span class="keywordflow">return</span> iFrames;
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<a name="l00199"></a>00199 }
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<a name="l00200"></a>00200
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<a name="l00201"></a>00201 } <span class="comment">// stk namespace</span>
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<a name="l00202"></a>00202
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<a name="l00203"></a>00203 <span class="preprocessor">#endif</span>
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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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