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/*
* Copyright 2009,2010,2011,2012 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 "DspCosine.h"
#include "PdGraph.h"
// initialise the static class variables
float *DspCosine::cos_table = NULL;
int DspCosine::refCount = 0;
MessageObject *DspCosine::newObject(PdMessage *initMessage, PdGraph *graph) {
return new DspCosine(initMessage, graph);
}
DspCosine::DspCosine(PdMessage *initMessage, PdGraph *graph) : DspObject(0, 1, 0, 1, graph) {
this->sampleRate = graph->getSampleRate();
processFunction = &procesSignal;
#if !__APPLE__ // only create the lookup table if it is really needed
refCount++;
if (cos_table == NULL) {
int sampleRateInt = (int) sampleRate;
cos_table = (float *) malloc((sampleRateInt + 1) * sizeof(float));
for (int i = 0; i < sampleRateInt; i++) {
cos_table[i] = cosf(2.0f * M_PI * ((float) i) / sampleRate);
}
cos_table[sampleRateInt] = cos_table[0];
}
#endif
}
DspCosine::~DspCosine() {
#if !__APPLE__
if (--refCount == 0) {
free(cos_table);
cos_table = NULL;
}
#endif
}
void DspCosine::procesSignal(DspObject *dspObject, int fromIndex, int toIndex) {
DspCosine *d = reinterpret_cast<DspCosine *>(dspObject);
// as no messages are received and there is only one inlet, processDsp does not need much of the
// infrastructure provided by DspObject
#if __APPLE__
static float twoPi = 2.0f*M_PI;
vDSP_vsmul(d->dspBufferAtInlet[0], 1, &twoPi, d->dspBufferAtOutlet[0], 1, toIndex);
vvcosf(d->dspBufferAtOutlet[0], d->dspBufferAtOutlet[0], &toIndex);
#else
for (int i = fromIndex; i < toIndex; ++i) {
// works because cosine is symmetric about zero
float f = fabsf(d->dspBufferAtInlet[0][i]);
f -= floorf(f);
d->dspBufferAtOutlet[0][i] = cos_table[(int) (f * d->sampleRate)];
}
#endif
}