git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf
161 lines
4.7 KiB
C++
161 lines
4.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
///
|
|
/// General FIR digital filter routines with MMX optimization.
|
|
///
|
|
/// Note : MMX optimized functions reside in a separate, platform-specific file,
|
|
/// e.g. 'mmx_win.cpp' or 'mmx_gcc.cpp'
|
|
///
|
|
/// Author : Copyright (c) Olli Parviainen
|
|
/// Author e-mail : oparviai @ iki.fi
|
|
/// SoundTouch WWW: http://www.iki.fi/oparviai/soundtouch
|
|
///
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Last changed : $Date$
|
|
// File revision : $Revision$
|
|
//
|
|
// $Id$
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// License :
|
|
//
|
|
// SoundTouch audio processing library
|
|
// Copyright (c) Olli Parviainen
|
|
//
|
|
// This library 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 2.1 of the License, or (at your option) any later version.
|
|
//
|
|
// This library 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 this library; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef FIRFilter_H
|
|
#define FIRFilter_H
|
|
|
|
#include "STTypes.h"
|
|
|
|
namespace soundtouch
|
|
{
|
|
|
|
class FIRFilter
|
|
{
|
|
protected:
|
|
// Number of FIR filter taps
|
|
uint length;
|
|
// Number of FIR filter taps divided by 8
|
|
uint lengthDiv8;
|
|
|
|
// Result divider factor in 2^k format
|
|
uint resultDivFactor;
|
|
|
|
// Result divider value.
|
|
SAMPLETYPE resultDivider;
|
|
|
|
// Memory for filter coefficients
|
|
SAMPLETYPE *filterCoeffs;
|
|
|
|
virtual uint evaluateFilterStereo(SAMPLETYPE *dest,
|
|
const SAMPLETYPE *src,
|
|
uint numSamples) const;
|
|
virtual uint evaluateFilterMono(SAMPLETYPE *dest,
|
|
const SAMPLETYPE *src,
|
|
uint numSamples) const;
|
|
|
|
FIRFilter();
|
|
|
|
public:
|
|
virtual ~FIRFilter();
|
|
|
|
static FIRFilter *newInstance();
|
|
|
|
/// Applies the filter to the given sequence of samples.
|
|
/// Note : The amount of outputted samples is by value of 'filter_length'
|
|
/// smaller than the amount of input samples.
|
|
///
|
|
/// \return Number of samples copied to 'dest'.
|
|
uint evaluate(SAMPLETYPE *dest,
|
|
const SAMPLETYPE *src,
|
|
uint numSamples,
|
|
uint numChannels) const;
|
|
|
|
uint getLength() const;
|
|
|
|
virtual void setCoefficients(const SAMPLETYPE *coeffs,
|
|
uint newLength,
|
|
uint uResultDivFactor);
|
|
};
|
|
|
|
|
|
// Optional subclasses that implement CPU-specific optimizations:
|
|
|
|
#ifdef ALLOW_MMX
|
|
|
|
/// Class that implements MMX optimized functions exclusive for 16bit integer samples type.
|
|
class FIRFilterMMX : public FIRFilter
|
|
{
|
|
protected:
|
|
short *filterCoeffsUnalign;
|
|
short *filterCoeffsAlign;
|
|
|
|
virtual uint evaluateFilterStereo(short *dest, const short *src, uint numSamples) const;
|
|
public:
|
|
FIRFilterMMX();
|
|
~FIRFilterMMX();
|
|
|
|
virtual void setCoefficients(const short *coeffs, uint newLength, uint uResultDivFactor);
|
|
};
|
|
|
|
#endif // ALLOW_MMX
|
|
|
|
|
|
#ifdef ALLOW_3DNOW
|
|
|
|
/// Class that implements 3DNow! optimized functions exclusive for floating point samples type.
|
|
class FIRFilter3DNow : public FIRFilter
|
|
{
|
|
protected:
|
|
float *filterCoeffsUnalign;
|
|
float *filterCoeffsAlign;
|
|
|
|
virtual uint evaluateFilterStereo(float *dest, const float *src, uint numSamples) const;
|
|
public:
|
|
FIRFilter3DNow();
|
|
~FIRFilter3DNow();
|
|
virtual void setCoefficients(const float *coeffs, uint newLength, uint uResultDivFactor);
|
|
};
|
|
|
|
#endif // ALLOW_3DNOW
|
|
|
|
|
|
#ifdef ALLOW_SSE
|
|
/// Class that implements SSE optimized functions exclusive for floating point samples type.
|
|
class FIRFilterSSE : public FIRFilter
|
|
{
|
|
protected:
|
|
float *filterCoeffsUnalign;
|
|
float *filterCoeffsAlign;
|
|
|
|
virtual uint evaluateFilterStereo(float *dest, const float *src, uint numSamples) const;
|
|
public:
|
|
FIRFilterSSE();
|
|
~FIRFilterSSE();
|
|
|
|
virtual void setCoefficients(const float *coeffs, uint newLength, uint uResultDivFactor);
|
|
};
|
|
|
|
#endif // ALLOW_SSE
|
|
|
|
}
|
|
|
|
#endif // FIRFilter_H
|