ZeroOrderResampler.h
/*
* This file is part of libsidplayfp, a SID player engine.
*
* Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
* Copyright 2007-2010 Antti Lankila
*
* 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.
*/
#ifndef ZEROORDER_RESAMPLER_H
#define ZEROORDER_RESAMPLER_H
#include "Resampler.h"
#include "sidcxx11.h"
namespace reSIDfp
{
class ZeroOrderResampler final : public Resampler
{
private:
int cachedSample;
const int cyclesPerSample;
int sampleOffset;
int outputValue;
public:
ZeroOrderResampler(double clockFrequency, double samplingFrequency) :
cachedSample(0),
cyclesPerSample(static_cast<int>(clockFrequency / samplingFrequency * 1024.)),
sampleOffset(0),
outputValue(0) {}
bool input(int sample) override
{
bool ready = false;
if (sampleOffset < 1024)
{
outputValue = cachedSample + (sampleOffset * (sample - cachedSample) >> 10);
ready = true;
sampleOffset += cyclesPerSample;
}
sampleOffset -= 1024;
cachedSample = sample;
return ready;
}
int output() const override { return outputValue; }
void reset() override
{
sampleOffset = 0;
cachedSample = 0;
}
};
} // namespace reSIDfp
#endif
reSIDfp::ZeroOrderResampler::input
bool input(int sample) override
Definition ZeroOrderResampler.h:59