annotate BassPedalRackPlugin/PluginProcessor.h @ 2:13ec2fa02a26 tip

(none)

/*
  ==============================================================================

    This file was auto-generated!

    It contains the basic startup code for a Juce application.

  ==============================================================================
*/

#ifndef __PLUGINPROCESSOR_H_4693CB6E__
#define __PLUGINPROCESSOR_H_4693CB6E__

#include "../JuceLibraryCode/JuceHeader.h"


//==============================================================================
/**
*/
class BassPedalRackProcessor  : public AudioProcessor
{
public:
    //==============================================================================
    BassPedalRackProcessor();
    ~BassPedalRackProcessor();

    //==============================================================================
    void prepareToPlay (double sampleRate, int samplesPerBlock);
    void releaseResources();

    void processBlock (AudioSampleBuffer& buffer, MidiBuffer& midiMessages);

    //==============================================================================
    AudioProcessorEditor* createEditor();
    bool hasEditor() const;

    //==============================================================================
    const String getName() const;

    int getNumParameters();

    float getParameter (int index);
    void setParameter (int index, float newValue);

    const String getParameterName (int index);
    const String getParameterText (int index);

    const String getInputChannelName (int channelIndex) const;
    const String getOutputChannelName (int channelIndex) const;
    bool isInputChannelStereoPair (int index) const;
    bool isOutputChannelStereoPair (int index) const;

    bool silenceInProducesSilenceOut() const;
    bool acceptsMidi() const;
    bool producesMidi() const;
    
    double getTailLengthSeconds() const;

    //==============================================================================
    int getNumPrograms();
    int getCurrentProgram();
    void setCurrentProgram (int index);
    const String getProgramName (int index);
    void changeProgramName (int index, const String& newName);

    //==============================================================================
    void getStateInformation (MemoryBlock& destData);
    void setStateInformation (const void* data, int sizeInBytes);
    
    //==============================================================================
    
    // these are used to persist the UI's size - the values are stored along with the
    // filter's other parameters, and the UI component will update them when it gets
    // resized.
    int lastUIWidth_, lastUIHeight_;



    enum Parameters
    {
        kMixParam = 0,
		kLowCutParam,
		kIndexParam,
		kGainParam,
		kHighCutParam,
		kGainTreParam,
		kGainMidParam,
		kGainLowParam,
		kGain1Param,
		kGain2Param,
		kGain3Param,
		kGain4Param,
		kGain5Param,
		kGain6Param,
		kGain7Param,
		kGain8Param,
		kGain9Param,
        kNumParameters
    };
    //Distortion related parameters
	float index_;		//Distortion index (x = x*index_)
	//gainN is the gain of the Nth Chebychev polynomial => gain of the Nth harmonic for a sinusoid
	float gain1_, gain2_, gain3_, gain4_, gain5_, gain6_, gain7_, gain8_, gain9_;
	
	float gain_;		//Overall gain of the amp => volume
	
	int lowCut_, highCut_;	//indices of the low pass filter (0 is allpass, max is nopass)
	float mix_;			//Mix between the low and high (0 is only low, 1 is only high)
	
	float bassGain_, midGain_, trebleGain_;  //gains for Low, Mid and Treble
	
private:

//Variables for tones
	    //temp variable for polynomial of tone control
		//lower case for transfer function, capital for filter coefficent
		//RC is the system's characterstic time (2 and 3 are respectivly square and cube of that)
	double a1_, a2_, a3_, b1_, b2_, b3_, RC_, RC2_, RC3_, A0,A1,A2,A3,B0,B1,B2,B3;
	double fsd_, fsd2_, fsd3_;//sampling frequency, then squared and cubed
	int a0_;
	    //Circular Buffers
	double memIn_[3]; //input
	double memOut_[3]; //output
	int currInd_; //indice in the circular buffers 
		//Memory for stereo
	double tonStackIn_[6];  //input
	double tonStackOut_[6];  //output

	bool toneStack_, shaper_; //if tone Stack(or shaper) is applied
	
//Variables for Chebychev distortion
	double coeffs_[10]; //Coefficient fo the polynomial
	float scale_; //scale to attenuate the gain of the distortion
	
//Variables for high and low pass filters
	double lastIn_[151];   //input circular buffer
	double inputMem_[302]; //Memory for stereo
	int filterLength_;     //length of the filters
	int filterInd_;        //indice for the circular buffer
	
	
	//Update distortion coefficients 
	void changeCoefficients(int kcase); //kcase enable to only update relevant coefficients
	//Update the tone coefficients
	void changeToneStack();
	//Save and load previous buffer for stereo handling
	void saveMem(int channel);
	void loadMem(int channel);
	
	//Apply low and high pass filter
	double* applyFilter(float input);
	//Apply Chebychev Distotion
	float shaper(float x);
	//Apply Tone control
	float applyToneStack(float);

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BassPedalRackProcessor);
	
};

#endif  // __PLUGINPROCESSOR_H_4693CB6E__