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SincResampler.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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* Copyright 2004 Dag Lem <resid@nimrod.no>
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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 SINCRESAMPLER_H
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#define SINCRESAMPLER_H
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#include "Resampler.h"
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#include <string>
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#include <map>
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#include "../array.h"
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namespace
reSIDfp
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{
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class
SincResampler
:
public
Resampler
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{
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private
:
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typedef
std::map<std::string, matrix_t> fir_cache_t;
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private
:
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static
const
int
RINGSIZE = 2048;
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static
const
int
BITS = 16;
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matrix_t
* firTable;
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int
sampleIndex;
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int
firRES, firN;
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const
int
cyclesPerSample;
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int
sampleOffset;
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int
outputValue;
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short
sample[RINGSIZE * 2];
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static
fir_cache_t FIR_CACHE;
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static
const
double
I0E;
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private
:
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static
double
I0(
double
x);
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static
int
convolve(
const
short
* a,
const
short
* b,
int
bLength);
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int
fir(
int
subcycle);
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public
:
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SincResampler
(
double
clockFrequency,
double
samplingFrequency,
double
highestAccurateFrequency);
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bool
input
(
int
input
);
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int
output()
const
{
return
outputValue; }
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void
reset();
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};
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}
// namespace reSIDfp
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#endif
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