juce_IIRFilter.h

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/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.
 
   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3
 
   Details of these licenses can be found at: www.gnu.org/licenses
 
   JUCE 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 General Public License for more details.
 
   ------------------------------------------------------------------------------
 
   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.
 
  ==============================================================================
*/
 
#ifndef JUCE_IIRFILTER_H_INCLUDED
#define JUCE_IIRFILTER_H_INCLUDED
 
class IIRFilter;
 
//==============================================================================
class JUCE_API  IIRCoefficients
{
public:
    //==============================================================================
    IIRCoefficients() noexcept;
 
    IIRCoefficients (double c1, double c2, double c3,
                     double c4, double c5, double c6) noexcept;
 
    IIRCoefficients (const IIRCoefficients&) noexcept;
    IIRCoefficients& operator= (const IIRCoefficients&) noexcept;
    ~IIRCoefficients() noexcept;
 
    static IIRCoefficients makeLowPass (double sampleRate,
                                        double frequency) noexcept;
 
    static IIRCoefficients makeHighPass (double sampleRate,
                                         double frequency) noexcept;
 
    //==============================================================================
    static IIRCoefficients makeLowShelf (double sampleRate,
                                         double cutOffFrequency,
                                         double Q,
                                         float gainFactor) noexcept;
 
    static IIRCoefficients makeHighShelf (double sampleRate,
                                          double cutOffFrequency,
                                          double Q,
                                          float gainFactor) noexcept;
 
    static IIRCoefficients makePeakFilter (double sampleRate,
                                           double centreFrequency,
                                           double Q,
                                           float gainFactor) noexcept;
 
    //==============================================================================
    float coefficients[5];
};
 
//==============================================================================
class JUCE_API  IIRFilter
{
public:
    //==============================================================================
    IIRFilter() noexcept;
 
    IIRFilter (const IIRFilter&) noexcept;
 
    ~IIRFilter() noexcept;
 
    //==============================================================================
    void makeInactive() noexcept;
 
    void setCoefficients (const IIRCoefficients& newCoefficients) noexcept;
 
    IIRCoefficients getCoefficients() const noexcept    { return coefficients; }
 
    //==============================================================================
    void reset() noexcept;
 
    void processSamples (float* samples, int numSamples) noexcept;
 
    float processSingleSampleRaw (float sample) noexcept;
 
protected:
    //==============================================================================
    SpinLock processLock;
    IIRCoefficients coefficients;
    float v1, v2;
    bool active;
 
    IIRFilter& operator= (const IIRFilter&);
    JUCE_LEAK_DETECTOR (IIRFilter)
};
 
 
#endif   // JUCE_IIRFILTER_H_INCLUDED