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140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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///
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/// General FIR digital filter routines with MMX optimization.
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///
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/// Note : MMX optimized functions reside in a separate, platform-specific file,
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/// e.g. 'mmx_win.cpp' or 'mmx_gcc.cpp'
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///
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/// Author : Copyright (c) Olli Parviainen
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/// Author e-mail : oparviai 'at' iki.fi
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/// SoundTouch WWW: http://www.surina.net/soundtouch
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///
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////////////////////////////////////////////////////////////////////////////////
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//
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// License :
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//
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// SoundTouch audio processing library
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// Copyright (c) Olli Parviainen
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////
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#ifndef FIRFilter_H
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#define FIRFilter_H
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#include <stddef.h>
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#include "STTypes.h"
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namespace soundtouch
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{
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class FIRFilter
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{
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protected:
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// Number of FIR filter taps
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uint length;
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// Number of FIR filter taps divided by 8
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uint lengthDiv8;
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// Result divider factor in 2^k format
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uint resultDivFactor;
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// Result divider value.
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SAMPLETYPE resultDivider;
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// Memory for filter coefficients
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SAMPLETYPE *filterCoeffs;
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virtual uint evaluateFilterStereo(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples) const;
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virtual uint evaluateFilterMono(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples) const;
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virtual uint evaluateFilterMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, uint numSamples, uint numChannels);
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public:
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FIRFilter();
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virtual ~FIRFilter();
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/// Operator 'new' is overloaded so that it automatically creates a suitable instance
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/// depending on if we've a MMX-capable CPU available or not.
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static void * operator new(size_t s);
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static FIRFilter *newInstance();
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/// Applies the filter to the given sequence of samples.
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/// Note : The amount of outputted samples is by value of 'filter_length'
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/// smaller than the amount of input samples.
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///
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/// \return Number of samples copied to 'dest'.
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uint evaluate(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples,
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uint numChannels);
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uint getLength() const;
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virtual void setCoefficients(const SAMPLETYPE *coeffs,
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uint newLength,
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uint uResultDivFactor);
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};
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// Optional subclasses that implement CPU-specific optimizations:
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#ifdef SOUNDTOUCH_ALLOW_MMX
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/// Class that implements MMX optimized functions exclusive for 16bit integer samples type.
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class FIRFilterMMX : public FIRFilter
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{
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protected:
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short *filterCoeffsUnalign;
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short *filterCoeffsAlign;
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virtual uint evaluateFilterStereo(short *dest, const short *src, uint numSamples) const;
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public:
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FIRFilterMMX();
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~FIRFilterMMX();
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virtual void setCoefficients(const short *coeffs, uint newLength, uint uResultDivFactor);
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};
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#endif // SOUNDTOUCH_ALLOW_MMX
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#ifdef SOUNDTOUCH_ALLOW_SSE
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/// Class that implements SSE optimized functions exclusive for floating point samples type.
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class FIRFilterSSE : public FIRFilter
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{
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protected:
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float *filterCoeffsUnalign;
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float *filterCoeffsAlign;
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virtual uint evaluateFilterStereo(float *dest, const float *src, uint numSamples) const;
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public:
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FIRFilterSSE();
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~FIRFilterSSE();
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virtual void setCoefficients(const float *coeffs, uint newLength, uint uResultDivFactor);
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};
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#endif // SOUNDTOUCH_ALLOW_SSE
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}
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#endif // FIRFilter_H
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