107 lines
1.3 KiB
C++
107 lines
1.3 KiB
C++
//
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// C++ Interface: eq
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//
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// Description:
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//
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//
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// Author: reduzio@gmail.com (C) 2006
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//
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// Copyright: See COPYING file that comes with this distribution
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//
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//
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#ifndef EQ_FILTER_H
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#define EQ_FILTER_H
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#include "typedefs.h"
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#include "vector.h"
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/**
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@author Juan Linietsky
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*/
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class EQ {
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public:
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enum Preset {
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PRESET_6_BANDS,
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PRESET_8_BANDS,
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PRESET_10_BANDS,
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PRESET_21_BANDS,
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PRESET_31_BANDS
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};
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class BandProcess {
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friend class EQ;
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float c1,c2,c3;
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struct History {
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float a1,a2,a3;
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float b1,b2,b3;
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} history;
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public:
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inline void process_one(float & p_data);
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BandProcess();
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};
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private:
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struct Band {
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float freq;
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float c1,c2,c3;
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};
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Vector<Band> band;
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float mix_rate;
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void recalculate_band_coefficients();
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public:
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void set_mix_rate(float p_mix_rate);
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int get_band_count() const;
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void set_preset_band_mode(Preset p_preset);
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void set_bands(const Vector<float>& p_bands);
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BandProcess get_band_processor(int p_band) const;
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float get_band_frequency(int p_band);
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EQ();
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~EQ();
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};
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/* Inline Function */
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inline void EQ::BandProcess::process_one(float & p_data) {
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history.a1=p_data;
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history.b1= c1 * ( history.a1 - history.a3 )
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+ c3 * history.b2
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- c2 * history.b3;
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p_data = history.b1;
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history.a3=history.a2;
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history.a2=history.a1;
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history.b3=history.b2;
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history.b2=history.b1;
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}
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#endif
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