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ZeroOrderResampler.h
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/*
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* This file is part of libsidplayfp, a SID player engine.
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*
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* Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
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* Copyright 2007-2010 Antti Lankila
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef ZEROORDER_RESAMPLER_H
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#define ZEROORDER_RESAMPLER_H
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#include "Resampler.h"
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#include "sidcxx11.h"
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namespace
reSIDfp
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{
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class
ZeroOrderResampler final :
public
Resampler
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{
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private
:
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int
cachedSample;
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const
int
cyclesPerSample;
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int
sampleOffset;
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int
outputValue;
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public
:
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ZeroOrderResampler(
double
clockFrequency,
double
samplingFrequency) :
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cachedSample(0),
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cyclesPerSample(
static_cast<
int
>
(clockFrequency / samplingFrequency * 1024.)),
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sampleOffset(0),
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outputValue(0) {}
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bool
input
(
int
sample)
override
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{
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bool
ready =
false
;
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if
(sampleOffset < 1024)
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{
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outputValue = cachedSample + (sampleOffset * (sample - cachedSample) >> 10);
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ready =
true
;
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sampleOffset += cyclesPerSample;
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}
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sampleOffset -= 1024;
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cachedSample = sample;
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return
ready;
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}
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int
output()
const override
{
return
outputValue; }
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void
reset()
override
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{
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sampleOffset = 0;
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cachedSample = 0;
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}
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};
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}
// namespace reSIDfp
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#endif
reSIDfp::ZeroOrderResampler::input
bool input(int sample) override
Definition
ZeroOrderResampler.h:59
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