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/*
* Copyright 2010 Reality Jockey, Ltd.
* info@rjdj.me
* http://rjdj.me/
*
* This file is part of ZenGarden.
*
* ZenGarden is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ZenGarden is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ZenGarden. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ArrayArithmetic.h"
#include "BufferPool.h"
#include "DspRfft.h"
#include "PdGraph.h"
MessageObject *DspRfft::newObject(PdMessage *initMessage, PdGraph *graph) {
return new DspRfft(initMessage, graph);
}
DspRfft::DspRfft(PdMessage *initMessage, PdGraph *graph) : DspObject(0, 1, 0, 2, graph) {
#if __APPLE__
log2n = lrintf(log2f((float) blockSizeInt));
fftSetup = vDSP_create_fftsetup(log2n, kFFTRadix2);
zeroBuffer = graph->getBufferPool()->getZeroBuffer(); // cache the local zero buffer
#else
graph->printErr("[rfft~] is not supported on this platform. It is only supported on Apple OS X and iOS platforms.");
#endif // __APPLE__
processFunction = &processSignal;
}
DspRfft::~DspRfft() {
#if __APPLE__
vDSP_destroy_fftsetup(fftSetup);
#endif // __APPLE__
}
void DspRfft::processSignal(DspObject *dspObject, int fromIndex, int toIndex) {
DspRfft *d = reinterpret_cast<DspRfft *>(dspObject);
#if __APPLE__
DSPSplitComplex inputVector;
inputVector.realp = d->dspBufferAtInlet[0];
inputVector.imagp = d->zeroBuffer;
DSPSplitComplex outputVector;
outputVector.realp = d->dspBufferAtOutlet[0];
outputVector.imagp = d->dspBufferAtOutlet[1];
vDSP_fft_zop(d->fftSetup, &inputVector, 1, &outputVector, 1, d->log2n, kFFTDirection_Forward);
// NOTE(mhroth): vDSP_fft_zop outputs the entire series of symmetric coefficients.
// Pd only returns the unique values. The below code makes this object output values in the same
// way that Pd does. But since the Apple fft and ifft functions require the symmetric values,
// we leave it like this for now.
//int halfBlockSize = blockSizeInt >> 1;
//memset(dspBufferAtOutlet0+halfBlockSize+1, 0, (halfBlockSize-1) * sizeof(float));
//memset(dspBufferAtOutlet[1]+halfBlockSize, 0, halfBlockSize * sizeof(float));
#endif // __APPLE__
}