Scarabaeus2D.cpp

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/** @file
 *
 * @ingroup dspTrajectoryLib
 *
 * @brief Scarabaeus Function Unit for Jamoma DSP
 *
 * @details see http://mathworld.wolfram.com/Scarabaeus.html for details @n
 * 
 * @authors Nils Peters
 *
 * @copyright Copyright © 2011 by Nils Peters @n
 * This code is licensed under the terms of the "New BSD License" @n
 * http://creativecommons.org/licenses/BSD/
 */

#include "Scarabaeus2D.h"


#define thisTTClass         Scarabaeus2D
#define thisTTClassName     "scarabaeus.2D"
#define thisTTClassTags     "audio, trajectory, 2D"


TT_AUDIO_CONSTRUCTOR
{   addAttribute(A,             kTypeFloat64);
    addAttribute(B,             kTypeFloat64);

    
    setAttributeValue(TT("a"),  0.6);
    setAttributeValue(TT("b"),  0.4);

    
    setProcessMethod(processAudio);
//  setCalculateMethod(calculateValue);
}


Scarabaeus2D::~Scarabaeus2D()
{
    ;
}

//TTErr Scarabaeus2D::calculateValue(const TTFloat64& x, TTFloat64& y, TTPtrSizedInt data)
//{
//  y = x;
//  return kTTErrNone;
//}


TTErr Scarabaeus2D::processAudio(TTAudioSignalArrayPtr inputs, TTAudioSignalArrayPtr outputs)
{
    TTAudioSignal&      out = outputs->getSignal(0);
    TTChannelCount      numOutputChannels = out.getNumChannelsAsInt();
    
    if (numOutputChannels != 2) {
        TTValue v = 2;      
        out.setMaxNumChannels(v);
        out.setNumChannels(v);      
    }
    
    TTAudioSignal&      in0 = inputs->getSignal(0);
    TTUInt16             vs = in0.getVectorSizeAsInt();
    
    TTSampleValuePtr    inSampleX           = in0.mSampleVectors[0];
    TTSampleValuePtr    outSampleX          = out.mSampleVectors[0];
    TTSampleValuePtr    outSampleY          = out.mSampleVectors[1];
    TTFloat64 phi, r;
    
    for (int i=0; i<vs; i++) {  
        
        phi = inSampleX[i] * kTTPi; // 0 .. 2Pi
        r = mB * cos(2*phi) - mA * cos(phi); 
        
        outSampleX[i] = sin(phi) * r;
        outSampleY[i] = cos(phi) * r;

    }
return kTTErrNone;
}