view CollidoscopeApp/include/EnvASR.h @ 0:02467299402e

First import

CollidoscopeApp for Raspberry Pi
JackDevice
Teensy code for Collidoscope

#pragma once 

namespace collidoscope {

template <typename T>
class EnvASR
{
public:

    enum class State {
        eAttack,
        eSustain,
        eRelease,
        eIdle // before attack after release  
    };

    EnvASR( T sustainLevel, T attackTime, T releaseTime, std::size_t sampleRate ) :
        mSustainLevel( sustainLevel ),
        mState( State::eIdle ),
        mValue( 0 )
        
    {
        if ( attackTime <= 0 )
            attackTime = T( 0.001 );

        if ( releaseTime <= 0 )
            releaseTime = T( 0.001 );
        
        mAttackRate =  T( 1.0 ) / (attackTime * sampleRate);
        mReleaseRate = T( 1.0 ) / (releaseTime * sampleRate);
    }

    T tick()
    {

        switch ( mState )
        {

        case State::eIdle: {
            mValue = 0;
        };
            break;

        case State::eAttack: {
            mValue += mAttackRate;
            if ( mValue >= mSustainLevel ){
                mValue = mSustainLevel;
                mState = State::eSustain;
            }
        };
            break;

        case State::eRelease:
            mValue -= mReleaseRate;
            if ( mValue <= 0 ){
                mValue = 0;
                mState = State::eIdle;
            }
            break;
        default:
            break;
        }

        return mValue;

    }

    State getState() const
    {
        return mState;
    }

    void setState( State state )
    {
        mState = state;
    }

private:
    T mSustainLevel;
    T mAttackRate;
    T mReleaseRate;

    // output
    T mValue;

    State mState;

};


}