plonk_DelayFormAllpassDecay.h

/*
 -------------------------------------------------------------------------------
 This file is part of the Plink, Plonk, Plank libraries
  by Martin Robinson
 
 http://code.google.com/p/pl-nk/
 
 Copyright University of the West of England, Bristol 2011-14
 All rights reserved.
 
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 * Neither the name of University of the West of England, Bristol nor 
   the names of its contributors may be used to endorse or promote products
   derived from this software without specific prior written permission.
 
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 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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 */

#ifndef PLONK_DELAYFORMALLPASSDECAY_H
#define PLONK_DELAYFORMALLPASSDECAY_H

#include "../channel/plonk_ChannelInternalCore.h"
#include "plonk_DelayForwardDeclarations.h"

template<class SampleType, Interp::TypeCode InterpTypeCode>
class DelayFormAllpassDecay
:   public DelayFormAllpassFFFB<SampleType>
{
public:
    typedef DelayFormAllpassFFFB<SampleType>                        Base;
    
    enum InParams
    {
        DurationIn,
        DecayIn,
        NumInParams
    };
    
    typedef typename Base::Data                                     Data;
    typedef typename Data::DelayState                               DelayState;
    typedef DelayFormAllpassDecay                                   FormType;
    
    typedef SampleType                                              SampleDataType;
    typedef Delay2ParamChannelInternal<FormType>                    DelayInternal;
    typedef ChannelBase<SampleType>                                 ChannelType;
    typedef ChannelInternal<SampleType,Data>                        Internal;
    typedef UnitBase<SampleType>                                    UnitType;
    typedef InputDictionary                                         Inputs;
    typedef NumericalArray<SampleType>                              Buffer;
    
    typedef typename TypeUtility<SampleType>::IndexType             Param1Type;  
    typedef Param1Type                                              DurationType;    
    typedef UnitBase<DurationType>                                  DurationUnitType;

    typedef typename TypeUtility<SampleType>::IndexType             Param2Type;  
    typedef Param2Type                                              DecayType;    
    typedef UnitBase<DecayType>                                     DecayUnitType;
    
    typedef InterpSelect<SampleType,DurationType,InterpTypeCode>    InterpSelectType;
    typedef typename InterpSelectType::InterpType                   InterpType;
    typedef typename InterpType::ExtensionBuffer                    ExtensionBuffer;

    
    typedef void (*InputFunction)  (Data&, DelayState&);
    typedef void (*ReadFunction)   (Data&, DelayState&);
    typedef void (*WriteFunction)  (Data&, DelayState&);
    typedef void (*OutputFunction) (Data&, DelayState&);
    typedef void (*Param1Function) (Data&, DelayState&, Param1Type const&);
    typedef void (*Param2Function) (Data&, DelayState&, Param2Type const&);
    
    static inline IntArray getInputKeys() throw()
    {
        const IntArray keys (IOKey::Generic, IOKey::Duration, IOKey::Decay);
        return keys;
    }    
            
    static inline void param1Process (Data& data, DelayState& state, DurationType const& duration) throw()
    {
        if (state.paramsIn[DurationIn] != duration)
        {
            state.paramsIn[DurationIn] = duration;
            state.paramsOut[Base::DurationInSamplesOut] = plonk::max (DurationType (1), DurationType (duration * data.base.sampleRate));
            plonk_assert (state.paramsOut[Base::DurationInSamplesOut] > 0 && 
                          state.paramsOut[Base::DurationInSamplesOut] <= state.bufferLengthIndex);
            state.paramsOut[Base::CoeffOut] = plonk::decayFeedback (state.paramsIn[DurationIn], state.paramsIn[DecayIn]);
        }
    }
    
    static inline void param2Ignore (Data&, DelayState&, DecayType const&) throw() { }
    static inline void param2Process (Data&, DelayState& state, DecayType const& decay) throw()
    {          
        if (state.paramsIn[DecayIn] != decay)
        {
            state.paramsIn[DecayIn] = decay;
            state.paramsOut[Base::CoeffOut] = plonk::decayFeedback (state.paramsIn[DurationIn], decay);
        }
    }
        
    static inline UnitType ar (UnitType const& input,
                               DurationUnitType const& duration,
                               DecayUnitType const& decay,
                               const DurationType maximumDuration,
                               UnitType const& mul,
                               UnitType const& add,
                               BlockSize const& preferredBlockSize,
                               SampleRate const& preferredSampleRate) throw()
    {             
        const Data data = { { -1.0, -1.0 }, maximumDuration, 0 };
        
        const int numInputChannels = input.getNumChannels();
        const int numDurationChannels = duration.getNumChannels();
        const int numDecayChannels = decay.getNumChannels();
        const int numChannels = plonk::max (numInputChannels, numDurationChannels, numDecayChannels);
        
        UnitType mainUnit = UnitType::emptyChannels (numChannels);
        
        for (int i = 0; i < numChannels; ++i)
        {
            Inputs inputs;
            inputs.put (IOKey::Generic, input[i]);
            inputs.put (IOKey::Duration, duration[i]);
            inputs.put (IOKey::Decay, decay[i]);
            
            UnitType unit = UnitType::template proxiesFromInputs<DelayInternal> (inputs,
                                                                                 data,
                                                                                 preferredBlockSize,
                                                                                 preferredSampleRate);
            mainUnit.put (i, unit);
        }
        
        return UnitType::applyMulAdd (mainUnit, mul, add);
    }
};


//------------------------------------------------------------------------------


template<class SampleType, Interp::TypeCode InterpTypeCode>
class AllpassDecayUnit
{
public:    
    typedef DelayFormAllpassDecay<SampleType,InterpTypeCode>    FormType;
    typedef DelayFormAllpassFFFB<SampleType,InterpTypeCode>     AltFormType;
    
    typedef Delay2ParamChannelInternal<FormType>                DelayInternal;
    typedef UnitBase<SampleType>                                UnitType;
    typedef InputDictionary                                     Inputs;
    
    typedef typename DelayInternal::Param1Type                  DurationType;
    typedef UnitBase<DurationType>                              DurationUnitType;
    
    typedef typename DelayInternal::Param2Type                  DecayType;
    typedef UnitBase<DecayType>                                 DecayUnitType;
    
    typedef AllpassDecayUnit<SampleType, Interp::Lagrange3>     HQ;
    typedef AllpassDecayUnit<SampleType, Interp::None>          N;
    
    
    static inline UnitInfos getInfo() throw()
    {
        const double blockSize = (double)BlockSize::getDefault().getValue();
        const double sampleRate = SampleRate::getDefault().getValue();
        
        return UnitInfo ("AllpassDecay", "An allpass delay setting the decay as a time to decay by 60dB.",
                         
                         // output
                         ChannelCount::VariableChannelCount, 
                         IOKey::Generic,            Measure::None,      0.0,                IOLimit::None,                         
                         IOKey::End,
                         
                         // inputs
                         IOKey::Generic,            Measure::None,      IOInfo::NoDefault,  IOLimit::None,
                         IOKey::Duration,           Measure::Seconds,   0.5,                IOLimit::Minimum,   Measure::Seconds,   0.0,
                         IOKey::Decay,              Measure::Seconds,   1.0,                IOLimit::None,
                         IOKey::MaximumDuration,    Measure::Seconds,   1.0,                IOLimit::Minimum,   Measure::Samples,   1.0,
                         IOKey::Multiply,           Measure::Factor,    1.0,                IOLimit::None,
                         IOKey::Add,                Measure::None,      0.0,                IOLimit::None,
                         IOKey::BlockSize,          Measure::Samples,   blockSize,          IOLimit::Minimum,   Measure::Samples,   1.0,
                         IOKey::SampleRate,         Measure::Hertz,     sampleRate,         IOLimit::Minimum,   Measure::Hertz,     0.0,
                         IOKey::End);
    }
    
    static UnitType ar (UnitType const& input,
                        DurationUnitType const& duration = DurationType (0.5),
                        DecayUnitType const& decay = DecayType (1.0),
                        const DurationType maximumDuration = DurationType (1.0),
                        UnitType const& mul = SampleType (1),
                        UnitType const& add = SampleType (0),
                        BlockSize const& preferredBlockSize = BlockSize::getDefault(),
                        SampleRate const& preferredSampleRate = SampleRate::getDefault()) throw()
    {          
        if (duration.isEachChannelConstant() && decay.isEachChannelConstant())
            return AltFormType::ar (input, duration, duration.getValues().decayFeedback (decay.getValues()), maximumDuration,
                                    mul, add, preferredBlockSize, preferredSampleRate);
        else 
            return FormType::ar (input, duration, decay, maximumDuration, 
                                 mul, add, preferredBlockSize, preferredSampleRate);
    }
    
};

typedef AllpassDecayUnit<PLONK_TYPE_DEFAULT> AllpassDecay;


#endif // PLONK_DELAYFORMALLPASSDECAY_H