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comparison: media/libsoundtouch/src/FIRFilter.h
media/libsoundtouch/src/FIRFilter.h
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| 1 //////////////////////////////////////////////////////////////////////////////// | |
| 2 /// | |
| 3 /// General FIR digital filter routines with MMX optimization. | |
| 4 /// | |
| 5 /// Note : MMX optimized functions reside in a separate, platform-specific file, | |
| 6 /// e.g. 'mmx_win.cpp' or 'mmx_gcc.cpp' | |
| 7 /// | |
| 8 /// Author : Copyright (c) Olli Parviainen | |
| 9 /// Author e-mail : oparviai 'at' iki.fi | |
| 10 /// SoundTouch WWW: http://www.surina.net/soundtouch | |
| 11 /// | |
| 12 //////////////////////////////////////////////////////////////////////////////// | |
| 13 // | |
| 14 // Last changed : $Date: 2013-06-12 10:24:44 -0500 (Wed, 12 Jun 2013) $ | |
| 15 // File revision : $Revision: 4 $ | |
| 16 // | |
| 17 // $Id: FIRFilter.h 171 2013-06-12 15:24:44Z oparviai $ | |
| 18 // | |
| 19 //////////////////////////////////////////////////////////////////////////////// | |
| 20 // | |
| 21 // License : | |
| 22 // | |
| 23 // SoundTouch audio processing library | |
| 24 // Copyright (c) Olli Parviainen | |
| 25 // | |
| 26 // This library is free software; you can redistribute it and/or | |
| 27 // modify it under the terms of the GNU Lesser General Public | |
| 28 // License as published by the Free Software Foundation; either | |
| 29 // version 2.1 of the License, or (at your option) any later version. | |
| 30 // | |
| 31 // This library is distributed in the hope that it will be useful, | |
| 32 // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 33 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 34 // Lesser General Public License for more details. | |
| 35 // | |
| 36 // You should have received a copy of the GNU Lesser General Public | |
| 37 // License along with this library; if not, write to the Free Software | |
| 38 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 39 // | |
| 40 //////////////////////////////////////////////////////////////////////////////// | |
| 41 | |
| 42 #ifndef FIRFilter_H | |
| 43 #define FIRFilter_H | |
| 44 | |
| 45 #include <stddef.h> | |
| 46 #include "STTypes.h" | |
| 47 | |
| 48 namespace soundtouch | |
| 49 { | |
| 50 | |
| 51 class FIRFilter | |
| 52 { | |
| 53 protected: | |
| 54 // Number of FIR filter taps | |
| 55 uint length; | |
| 56 // Number of FIR filter taps divided by 8 | |
| 57 uint lengthDiv8; | |
| 58 | |
| 59 // Result divider factor in 2^k format | |
| 60 uint resultDivFactor; | |
| 61 | |
| 62 // Result divider value. | |
| 63 SAMPLETYPE resultDivider; | |
| 64 | |
| 65 // Memory for filter coefficients | |
| 66 SAMPLETYPE *filterCoeffs; | |
| 67 | |
| 68 virtual uint evaluateFilterStereo(SAMPLETYPE *dest, | |
| 69 const SAMPLETYPE *src, | |
| 70 uint numSamples) const; | |
| 71 virtual uint evaluateFilterMono(SAMPLETYPE *dest, | |
| 72 const SAMPLETYPE *src, | |
| 73 uint numSamples) const; | |
| 74 virtual uint evaluateFilterMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, uint numSamples, uint numChannels) const; | |
| 75 | |
| 76 public: | |
| 77 FIRFilter(); | |
| 78 virtual ~FIRFilter(); | |
| 79 | |
| 80 /// Operator 'new' is overloaded so that it automatically creates a suitable instance | |
| 81 /// depending on if we've a MMX-capable CPU available or not. | |
| 82 static void * operator new(size_t s); | |
| 83 | |
| 84 static FIRFilter *newInstance(); | |
| 85 | |
| 86 /// Applies the filter to the given sequence of samples. | |
| 87 /// Note : The amount of outputted samples is by value of 'filter_length' | |
| 88 /// smaller than the amount of input samples. | |
| 89 /// | |
| 90 /// \return Number of samples copied to 'dest'. | |
| 91 uint evaluate(SAMPLETYPE *dest, | |
| 92 const SAMPLETYPE *src, | |
| 93 uint numSamples, | |
| 94 uint numChannels) const; | |
| 95 | |
| 96 uint getLength() const; | |
| 97 | |
| 98 virtual void setCoefficients(const SAMPLETYPE *coeffs, | |
| 99 uint newLength, | |
| 100 uint uResultDivFactor); | |
| 101 }; | |
| 102 | |
| 103 | |
| 104 // Optional subclasses that implement CPU-specific optimizations: | |
| 105 | |
| 106 #ifdef SOUNDTOUCH_ALLOW_MMX | |
| 107 | |
| 108 /// Class that implements MMX optimized functions exclusive for 16bit integer samples type. | |
| 109 class FIRFilterMMX : public FIRFilter | |
| 110 { | |
| 111 protected: | |
| 112 short *filterCoeffsUnalign; | |
| 113 short *filterCoeffsAlign; | |
| 114 | |
| 115 virtual uint evaluateFilterStereo(short *dest, const short *src, uint numSamples) const; | |
| 116 public: | |
| 117 FIRFilterMMX(); | |
| 118 ~FIRFilterMMX(); | |
| 119 | |
| 120 virtual void setCoefficients(const short *coeffs, uint newLength, uint uResultDivFactor); | |
| 121 }; | |
| 122 | |
| 123 #endif // SOUNDTOUCH_ALLOW_MMX | |
| 124 | |
| 125 | |
| 126 #ifdef SOUNDTOUCH_ALLOW_SSE | |
| 127 /// Class that implements SSE optimized functions exclusive for floating point samples type. | |
| 128 class FIRFilterSSE : public FIRFilter | |
| 129 { | |
| 130 protected: | |
| 131 float *filterCoeffsUnalign; | |
| 132 float *filterCoeffsAlign; | |
| 133 | |
| 134 virtual uint evaluateFilterStereo(float *dest, const float *src, uint numSamples) const; | |
| 135 public: | |
| 136 FIRFilterSSE(); | |
| 137 ~FIRFilterSSE(); | |
| 138 | |
| 139 virtual void setCoefficients(const float *coeffs, uint newLength, uint uResultDivFactor); | |
| 140 }; | |
| 141 | |
| 142 #endif // SOUNDTOUCH_ALLOW_SSE | |
| 143 | |
| 144 } | |
| 145 | |
| 146 #endif // FIRFilter_H |
