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//===========================================================================
//
// PanDelay, panoramic rotating delay
//
// version 0.0.1
//
// pandelaymodel.cpp
//
//
// Copyright (c) 2006 Nil Geisweiller
//
//
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301, USA or point your web browser to http://www.gnu.org.
//===========================================================================
#include "pandelaymodel.h"
#include <stdio.h>
PanDelayModel::PanDelayModel(int samplerate) {
for(int i = 0; i < MAXBUFFERLENGTH; i++) {
_leftBuffer[i] = 0.0;
_rightBuffer[i] = 0.0;
}
_bufferPointer = 0;
_inc = 0.0;
_l = 1.0;
_r = 1.0;
_samplerate = samplerate;
_beatRatio = 4;
setBPM(120);
setPanDelay();
}
PanDelayModel::~PanDelayModel() {
}
void PanDelayModel::setSamplerate(int sr) {
_samplerate = sr;
setPanDelay();
}
void PanDelayModel::setBPM(float bpm) {
_BPM = bpm;
_delayTime = _beatRatio * 60.0 / _BPM;
setPanDelay();
}
void PanDelayModel::setBeatRatio(float br) {
_beatRatio = br;
_delayTime = _beatRatio * 60.0 / _BPM;
setPanDelay();
}
void PanDelayModel::setDelayTime(float dt) {
if(dt < MINDELAYTIME) _delayTime = MINDELAYTIME;
else if(dt > MAXDELAYTIME) _delayTime = MAXDELAYTIME;
else _delayTime = dt;
setPanDelay();
}
void PanDelayModel::setFeedback(float fb) {
_feedback = fb;
setPanDelay();
}
void PanDelayModel::setPanLFOFreq(float pf) {
_panLFOFreq = pf;
setPanDelay();
}
void PanDelayModel::setPanLFODepth(float pd) {
_panLFODepth = pd;
setPanDelay();
}
void PanDelayModel::setDryWet(float dw) {
_dryWet = dw;
}
void PanDelayModel::setPanDelay() {
float numLFOSample = (1.0/_panLFOFreq) * (float)_samplerate;
_inc = 2.0 / numLFOSample;
_delaySampleSize = (int)(_delayTime * (float)_samplerate);
_lBound = 1.0 - _panLFODepth;
_rBound = 1.0 + _panLFODepth;
}
void PanDelayModel::processMix(float* leftSamplesIn, float* rightSamplesIn,
float* leftSamplesOut, float* rightSamplesOut,
unsigned n) {
float ls, rs, p;
p = 1.0 - _dryWet;
for(unsigned i = 0; i < n; i++) {
//read buffer
ls = _leftBuffer[_bufferPointer];
rs = _rightBuffer[_bufferPointer];
//write buffer
_leftBuffer[_bufferPointer] *= _feedback;
_leftBuffer[_bufferPointer] += leftSamplesIn[i];
_rightBuffer[_bufferPointer] *= _feedback;
_rightBuffer[_bufferPointer] += rightSamplesIn[i];
//write out
leftSamplesOut[i] += _l * _dryWet * ls + p * leftSamplesIn[i];
rightSamplesOut[i] += _r * _dryWet * rs + p * rightSamplesIn[i];
//update _bufferPointer
_bufferPointer++;
_bufferPointer%=_delaySampleSize;
//update _l _r
_r += _inc;
_l -= _inc;
//update _inc
if(_r > _rBound || _r < _lBound) _inc = -_inc;
}
}
void PanDelayModel::processReplace(float* leftSamplesIn, float* rightSamplesIn,
float* leftSamplesOut,
float* rightSamplesOut, unsigned n) {
float ls, rs, p;
p = 1.0 - _dryWet;
for(unsigned i = 0; i < n; i++) {
//read buffer
ls = _leftBuffer[_bufferPointer];
rs = _rightBuffer[_bufferPointer];
//write buffer
_leftBuffer[_bufferPointer] *= _feedback;
_leftBuffer[_bufferPointer] += leftSamplesIn[i];
_rightBuffer[_bufferPointer] *= _feedback;
_rightBuffer[_bufferPointer] += rightSamplesIn[i];
//write out
leftSamplesOut[i] = _l * _dryWet * ls + p * leftSamplesIn[i];
rightSamplesOut[i] = _r * _dryWet * rs + p * rightSamplesIn[i];
//update _bufferPointer
_bufferPointer++;
_bufferPointer%=_delaySampleSize;
//update _l _r
_r += _inc;
_l -= _inc;
//update _inc
if(_r > _rBound || _r < _lBound) _inc = -_inc;
}
}
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