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<h1>LentPitShift.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef STK_LENLentPitShift_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define STK_LENLentPitShift_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include &quot;Effect.h&quot;</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include &quot;Delay.h&quot;</span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 <span class="keyword">namespace </span>stk {
<a name="l00008"></a>00008
<a name="l00009"></a>00009 <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_1LentPitShift.html">00020</a> <span class="keyword">class </span><a class="code" href="classstk_1_1LentPitShift.html" title="Pitch shifter effect class based on the Lent algorithm.">LentPitShift</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Effect.html" title="STK abstract effects parent class.">Effect</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_1LentPitShift.html#a0eb0c1ba3d8fdb6eaabb1c96c58ed536" title="Class constructor.">LentPitShift</a>( StkFloat periodRatio = 1.0, <span class="keywordtype">int</span> tMax = RT_BUFFER_SIZE );
<a name="l00025"></a>00025
<a name="l00026"></a>00026 ~<a class="code" href="classstk_1_1LentPitShift.html" title="Pitch shifter effect class based on the Lent algorithm.">LentPitShift</a>( <span class="keywordtype">void</span> ) {
<a name="l00027"></a>00027 <span class="keyword">delete</span> window;
<a name="l00028"></a>00028 window = NULL;
<a name="l00029"></a>00029 <span class="keyword">delete</span> dt;
<a name="l00030"></a>00030 dt = NULL;
<a name="l00031"></a>00031 <span class="keyword">delete</span> dpt;
<a name="l00032"></a>00032 dpt = NULL;
<a name="l00033"></a>00033 <span class="keyword">delete</span> cumDt;
<a name="l00034"></a>00034 cumDt = NULL;
<a name="l00035"></a>00035 }
<a name="l00036"></a>00036
<a name="l00038"></a>00038 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1LentPitShift.html#a5661bf4cd0a4b5b2bf9e4e81603c74be" title="Reset and clear all internal state.">clear</a>( <span class="keywordtype">void</span> );
<a name="l00039"></a>00039
<a name="l00041"></a>00041 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1LentPitShift.html#a5dfe0a19b2ac3db599c808f4d676c076" title="Set the pitch shift factor (1.0 produces no shift).">setShift</a>( StkFloat shift );
<a name="l00042"></a>00042
<a name="l00044"></a>00044 StkFloat <a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">tick</a>( StkFloat input );
<a name="l00045"></a>00045
<a name="l00047"></a>00047
<a name="l00055"></a>00055 <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_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" 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="l00056"></a>00056
<a name="l00058"></a>00058
<a name="l00066"></a>00066 <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_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" 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="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keyword">protected</span>:
<a name="l00069"></a>00069
<a name="l00071"></a>00071
<a name="l00075"></a>00075 <span class="keywordtype">void</span> <a class="code" href="classstk_1_1LentPitShift.html#a5af0a9e3902ca6fc7c5d77d861d74445" title="Apply the effect on the input samples and store it.">process</a>( );
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="comment">// Frame storage vectors for process function</span>
<a name="l00078"></a>00078 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> inputFrames;
<a name="l00079"></a>00079 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> outputFrames;
<a name="l00080"></a>00080 <span class="keywordtype">int</span> ptrFrames; <span class="comment">// writing pointer</span>
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="comment">// Input delay line</span>
<a name="l00083"></a>00083 <a class="code" href="classstk_1_1Delay.html" title="STK non-interpolating delay line class.">Delay</a> inputLine_;
<a name="l00084"></a>00084 <span class="keywordtype">int</span> inputPtr;
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">// Output delay line</span>
<a name="l00087"></a>00087 <a class="code" href="classstk_1_1Delay.html" title="STK non-interpolating delay line class.">Delay</a> outputLine_;
<a name="l00088"></a>00088 <span class="keywordtype">double</span> outputPtr;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="comment">// Pitch tracker variables</span>
<a name="l00091"></a>00091 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> tMax_; <span class="comment">// Maximal period measurable by the pitch tracker.</span>
<a name="l00092"></a>00092 <span class="comment">// It is also the size of the window used by the pitch tracker and</span>
<a name="l00093"></a>00093 <span class="comment">// the size of the frames that can be computed by the tick function</span>
<a name="l00094"></a>00094
<a name="l00095"></a>00095 StkFloat threshold_; <span class="comment">// Threshold of detection for the pitch tracker</span>
<a name="l00096"></a>00096 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> lastPeriod_; <span class="comment">// Result of the last pitch tracking loop</span>
<a name="l00097"></a>00097 StkFloat* dt; <span class="comment">// Array containing the euclidian distance coefficients</span>
<a name="l00098"></a>00098 StkFloat* cumDt; <span class="comment">// Array containing the cumulative sum of the coefficients in dt</span>
<a name="l00099"></a>00099 StkFloat* dpt; <span class="comment">// Array containing the pitch tracking function coefficients</span>
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="comment">// Pitch shifter variables</span>
<a name="l00102"></a>00102 StkFloat env[2]; <span class="comment">// Coefficients for the linear interpolation when modifying the output samples</span>
<a name="l00103"></a>00103 StkFloat* window; <span class="comment">// Hamming window used for the input portion extraction</span>
<a name="l00104"></a>00104 <span class="keywordtype">double</span> periodRatio_; <span class="comment">// Ratio of modification of the signal period</span>
<a name="l00105"></a>00105 <a class="code" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> zeroFrame; <span class="comment">// Frame of tMax_ zero samples</span>
<a name="l00106"></a>00106
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="comment">// Coefficient delay line that could be used for a dynamic calculation of the pitch</span>
<a name="l00109"></a>00109 <span class="comment">//Delay* coeffLine_;</span>
<a name="l00110"></a>00110
<a name="l00111"></a>00111 };
<a name="l00112"></a>00112
<a name="l00113"></a><a class="code" href="classstk_1_1LentPitShift.html#a5af0a9e3902ca6fc7c5d77d861d74445">00113</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classstk_1_1LentPitShift.html#a5af0a9e3902ca6fc7c5d77d861d74445" title="Apply the effect on the input samples and store it.">LentPitShift::process</a>()
<a name="l00114"></a>00114 {
<a name="l00115"></a>00115 StkFloat x_t; <span class="comment">// input coefficient</span>
<a name="l00116"></a>00116 StkFloat x_t_T; <span class="comment">// previous input coefficient at T samples</span>
<a name="l00117"></a>00117 StkFloat coeff; <span class="comment">// new coefficient for the difference function</span>
<a name="l00118"></a>00118
<a name="l00119"></a>00119 <span class="keywordtype">int</span> alternativePitch = tMax_; <span class="comment">// Global minimum storage</span>
<a name="l00120"></a>00120 lastPeriod_ = tMax_+1; <span class="comment">// Storage of the lowest local minimum under the threshold</span>
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">// Loop variables</span>
<a name="l00123"></a>00123 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> delay_;
<a name="l00124"></a>00124 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n;
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="comment">// Initialization of the dt coefficients. Since the</span>
<a name="l00127"></a>00127 <span class="comment">// frames are of tMax_ length, there is no overlapping</span>
<a name="l00128"></a>00128 <span class="comment">// between the successive windows where pitch tracking</span>
<a name="l00129"></a>00129 <span class="comment">// is performed.</span>
<a name="l00130"></a>00130 <span class="keywordflow">for</span> ( delay_=1; delay_&lt;=tMax_; delay_++ )
<a name="l00131"></a>00131 dt[delay_] = 0.;
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="comment">// Calculation of the dt coefficients and update of the input delay line.</span>
<a name="l00134"></a>00134 <span class="keywordflow">for</span> ( n=0; n&lt;inputFrames.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>(); n++ ) {
<a name="l00135"></a>00135 x_t = inputLine_.<a class="code" href="classstk_1_1Delay.html#aa1a929e0e324417b8a55cbf8770532e9" title="Input one sample to the filter and return one output.">tick</a>( inputFrames[ n ] );
<a name="l00136"></a>00136 <span class="keywordflow">for</span> ( delay_=1; delay_&lt;= tMax_; delay_++ ) {
<a name="l00137"></a>00137 x_t_T = inputLine_.<a class="code" href="classstk_1_1Delay.html#a4d5e5bab50e4fa062bd3f0e9e2fd19db" title="Return the value at tapDelay samples from the delay-line input.">tapOut</a>( delay_ );
<a name="l00138"></a>00138 coeff = x_t - x_t_T;
<a name="l00139"></a>00139 dt[delay_] += coeff * coeff;
<a name="l00140"></a>00140 }
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="comment">// Calculation of the pitch tracking function and test for the minima.</span>
<a name="l00144"></a>00144 <span class="keywordflow">for</span> ( delay_=1; delay_&lt;=tMax_; delay_++ ) {
<a name="l00145"></a>00145 cumDt[delay_] = dt[delay_] + cumDt[delay_-1];
<a name="l00146"></a>00146 dpt[delay_] = dt[delay_] * delay_ / cumDt[delay_];
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="comment">// Look for a minimum</span>
<a name="l00149"></a>00149 <span class="keywordflow">if</span> ( dpt[delay_-1]-dpt[delay_-2] &lt; 0 &amp;&amp; dpt[delay_]-dpt[delay_-1] &gt; 0 ) {
<a name="l00150"></a>00150 <span class="comment">// Check if the minimum is under the threshold</span>
<a name="l00151"></a>00151 <span class="keywordflow">if</span> ( dpt[delay_-1] &lt; threshold_ ){
<a name="l00152"></a>00152 lastPeriod_ = delay_-1;
<a name="l00153"></a>00153 <span class="comment">// If a minimum is found, we can stop the loop</span>
<a name="l00154"></a>00154 <span class="keywordflow">break</span>;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( dpt[alternativePitch] &gt; dpt[delay_-1] )
<a name="l00157"></a>00157 <span class="comment">// Otherwise we store it if it is the current global minimum</span>
<a name="l00158"></a>00158 alternativePitch = delay_-1;
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="comment">// Test for the last period length.</span>
<a name="l00163"></a>00163 <span class="keywordflow">if</span> ( dpt[delay_]-dpt[delay_-1] &lt; 0 ) {
<a name="l00164"></a>00164 <span class="keywordflow">if</span> ( dpt[delay_] &lt; threshold_ )
<a name="l00165"></a>00165 lastPeriod_ = delay_;
<a name="l00166"></a>00166 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( dpt[alternativePitch] &gt; dpt[delay_] )
<a name="l00167"></a>00167 alternativePitch = delay_;
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="keywordflow">if</span> ( lastPeriod_ == tMax_+1 )
<a name="l00171"></a>00171 <span class="comment">// No period has been under the threshold so we used the global minimum</span>
<a name="l00172"></a>00172 lastPeriod_ = alternativePitch;
<a name="l00173"></a>00173
<a name="l00174"></a>00174 <span class="comment">// We put the new zero output coefficients in the output delay line and </span>
<a name="l00175"></a>00175 <span class="comment">// we get the previous calculated coefficients</span>
<a name="l00176"></a>00176 outputLine_.<a class="code" href="classstk_1_1Delay.html#aa1a929e0e324417b8a55cbf8770532e9" title="Input one sample to the filter and return one output.">tick</a>( zeroFrame, outputFrames );
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="comment">// Initialization of the Hamming window used in the algorithm</span>
<a name="l00179"></a>00179 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> n=-(<span class="keywordtype">int</span>)lastPeriod_; n&lt;(int)lastPeriod_; n++ )
<a name="l00180"></a>00180 window[n+lastPeriod_] = (1 + cos(PI*n/lastPeriod_)) / 2 ;
<a name="l00181"></a>00181
<a name="l00182"></a>00182 <span class="keywordtype">int</span> M; <span class="comment">// Index of reading in the input delay line</span>
<a name="l00183"></a>00183 <span class="keywordtype">int</span> N; <span class="comment">// Index of writing in the output delay line</span>
<a name="l00184"></a>00184 <span class="keywordtype">double</span> sample; <span class="comment">// Temporary storage for the new coefficient</span>
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <span class="comment">// We loop for all the frames of length lastPeriod_ presents between inputPtr and tMax_</span>
<a name="l00187"></a>00187 <span class="keywordflow">for</span> ( ; inputPtr&lt;(int)(tMax_-lastPeriod_); inputPtr+=lastPeriod_ ) {
<a name="l00188"></a>00188 <span class="comment">// Test for the decision of compression/expansion</span>
<a name="l00189"></a>00189 <span class="keywordflow">while</span> ( outputPtr &lt; inputPtr ) {
<a name="l00190"></a>00190 <span class="comment">// Coefficients for the linear interpolation</span>
<a name="l00191"></a>00191 env[1] = fmod( outputPtr + tMax_, 1.0 );
<a name="l00192"></a>00192 env[0] = 1.0 - env[1];
<a name="l00193"></a>00193 M = tMax_ - inputPtr + lastPeriod_ - 1; <span class="comment">// New reading pointer</span>
<a name="l00194"></a>00194 N = 2*tMax_ - (<span class="keywordtype">unsigned</span> long)floor(outputPtr + tMax_) + lastPeriod_ - 1; <span class="comment">// New writing pointer</span>
<a name="l00195"></a>00195 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j&lt;2*lastPeriod_; j++,M--,N-- ) {
<a name="l00196"></a>00196 sample = inputLine_.<a class="code" href="classstk_1_1Delay.html#a4d5e5bab50e4fa062bd3f0e9e2fd19db" title="Return the value at tapDelay samples from the delay-line input.">tapOut</a>(M) * window[j] / 2.;
<a name="l00197"></a>00197 <span class="comment">// Linear interpolation</span>
<a name="l00198"></a>00198 outputLine_.<a class="code" href="classstk_1_1Delay.html#a80f143ab956c9d3b1721958ece6da65e" title="Sum the provided value into the delay line at tapDelay samples from the input.">addTo</a>(N, env[0] * sample);
<a name="l00199"></a>00199 outputLine_.<a class="code" href="classstk_1_1Delay.html#a80f143ab956c9d3b1721958ece6da65e" title="Sum the provided value into the delay line at tapDelay samples from the input.">addTo</a>(N-1, env[1] * sample);
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201 outputPtr = outputPtr + lastPeriod_ * periodRatio_; <span class="comment">// new output pointer</span>
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204 <span class="comment">// Shifting of the pointers waiting for the new frame of length tMax_.</span>
<a name="l00205"></a>00205 outputPtr -= tMax_;
<a name="l00206"></a>00206 inputPtr -= tMax_;
<a name="l00207"></a>00207 }
<a name="l00208"></a>00208
<a name="l00209"></a>00209
<a name="l00210"></a><a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d">00210</a> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">LentPitShift :: tick</a>( StkFloat input )
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 StkFloat sample;
<a name="l00213"></a>00213
<a name="l00214"></a>00214 inputFrames[ptrFrames] = input;
<a name="l00215"></a>00215
<a name="l00216"></a>00216 sample = outputFrames[ptrFrames++];
<a name="l00217"></a>00217
<a name="l00218"></a>00218 <span class="comment">// Check for end condition</span>
<a name="l00219"></a>00219 <span class="keywordflow">if</span> ( ptrFrames == (<span class="keywordtype">int</span>) inputFrames.<a class="code" href="classstk_1_1StkFrames.html#a5c41aae98f77487c004085912d1f8f79" title="Returns the total number of audio samples represented by the object.">size</a>() ){
<a name="l00220"></a>00220 ptrFrames = 0;
<a name="l00221"></a>00221 <a class="code" href="classstk_1_1LentPitShift.html#a5af0a9e3902ca6fc7c5d77d861d74445" title="Apply the effect on the input samples and store it.">process</a>( );
<a name="l00222"></a>00222 }
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keywordflow">return</span> sample;
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226
<a name="l00227"></a><a class="code" href="classstk_1_1LentPitShift.html#a158cb313f45bbae6ee327cbc539abdd1">00227</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_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">LentPitShift :: 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="l00228"></a>00228 {
<a name="l00229"></a>00229 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00230"></a>00230 <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="l00231"></a>00231 oStream_ &lt;&lt; <span class="stringliteral">&quot;LentPitShift::tick(): channel and StkFrames arguments are incompatible!&quot;</span>;
<a name="l00232"></a>00232 <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="l00233"></a>00233 }
<a name="l00234"></a>00234 <span class="preprocessor">#endif</span>
<a name="l00235"></a>00235 <span class="preprocessor"></span>
<a name="l00236"></a>00236 StkFloat *samples = &amp;frames[channel];
<a name="l00237"></a>00237 <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="l00238"></a>00238 <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="l00239"></a>00239 *samples = <a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">tick</a>( *samples );
<a name="l00240"></a>00240 }
<a name="l00241"></a>00241
<a name="l00242"></a>00242 <span class="keywordflow">return</span> frames;
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244
<a name="l00245"></a><a class="code" href="classstk_1_1LentPitShift.html#af93de733eedca65de40597bd4a1f7b2a">00245</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_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">LentPitShift :: 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="l00246"></a>00246 {
<a name="l00247"></a>00247 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00248"></a>00248 <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="l00249"></a>00249 oStream_ &lt;&lt; <span class="stringliteral">&quot;LentPitShift::tick(): channel and StkFrames arguments are incompatible!&quot;</span>;
<a name="l00250"></a>00250 <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="l00251"></a>00251 }
<a name="l00252"></a>00252 <span class="preprocessor">#endif</span>
<a name="l00253"></a>00253 <span class="preprocessor"></span>
<a name="l00254"></a>00254 StkFloat *iSamples = &amp;iFrames[iChannel];
<a name="l00255"></a>00255 StkFloat *oSamples = &amp;oFrames[oChannel];
<a name="l00256"></a>00256 <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="l00257"></a>00257 <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="l00258"></a>00258 *oSamples = <a class="code" href="classstk_1_1LentPitShift.html#a2bbc39e8e78dc672a0be451ec1fd6b7d" title="Input one sample to the filter and return one output.">tick</a>( *iSamples );
<a name="l00259"></a>00259 }
<a name="l00260"></a>00260
<a name="l00261"></a>00261 <span class="keywordflow">return</span> iFrames;
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00264"></a>00264 } <span class="comment">// stk namespace</span>
<a name="l00265"></a>00265
<a name="l00266"></a>00266 <span class="preprocessor">#endif</span>
<a name="l00267"></a>00267 <span class="preprocessor"></span>
</pre></div></div>
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