plonk_DelayFormAllpassFFFB.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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   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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 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
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 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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 */

#ifndef PLONK_DELAYFORMALLPASSFFFB_H
#define PLONK_DELAYFORMALLPASSFFFB_H

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

template<class SampleType, Interp::TypeCode InterpTypeCode>
class DelayFormAllpassFFFB
:   public DelayForm<SampleType, DelayFormType::AllpassFFFB, 2, 2>
{
public:
    typedef DelayForm<SampleType, DelayFormType::AllpassFFFB, 2, 2> Base;
    
    enum InParams
    {
        DurationIn,
        CoeffIn,
        NumInParams
    };
    
    enum OutParams
    {
        DurationInSamplesOut,
        CoeffOut,
        NumOutParams
    };
    
    typedef typename Base::Data Data;
    typedef typename Data::DelayState                               DelayState;
    typedef DelayFormAllpassFFFB                                    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                                              CoeffType;    
    typedef UnitBase<CoeffType>                                     CoeffUnitType;
    
    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::Coeffs);
        return keys;
    }    
    
    static inline void inputIgnore (Data&, DelayState&) throw() { plonk_assertfalse; }
    static inline void inputRead (Data&, DelayState& state) throw()
    {
        state.inputValue = *state.inputSamples++;
    }
    
    static inline void readIgnore (Data&, DelayState&) throw() { }
    static inline void readRead (Data&, DelayState& state) throw()
    {
        const DurationType readPosition = DurationType (state.writePosition) - state.paramsOut[DurationInSamplesOut] + state.bufferLengthIndex;
//        plonk_assert (readPosition >= 0 && readPosition <= state.bufferLengthIndex);
        state.readValue = InterpType::lookup (state.bufferSamples, readPosition);
    }
    
    static inline void writeIgnore (Data&, DelayState&) throw() { }
    static inline void writeWrite (Data&, DelayState& state) throw()
    {
        plonk_assert (state.writePosition >= 0 && state.writePosition < state.bufferLength);
        state.writeValue = state.inputValue + state.paramsOut[CoeffOut] * state.readValue;
        state.bufferSamples[state.writePosition] = state.writeValue;
        state.bufferSamples[state.writePosition + state.bufferLength] = state.writeValue; // for interpolation
        state.bufferSamples[state.writePosition + state.bufferLength + state.bufferLength] = state.writeValue; // for interpolation

    }
    
    static inline void outputIgnore (Data&, DelayState&) throw() { }
    static inline void outputWrite (Data&, DelayState& state) throw()
    {
        state.outputValue = state.readValue - state.paramsOut[CoeffOut] * state.writeValue;
        *state.outputSamples++ = state.outputValue;
        state.writePosition++;
    }
    
    static inline void param1Ignore (Data&, DelayState&, DurationType const&) throw() { }
    static inline void param1Process (Data& data, DelayState& state, DurationType const& duration) throw()
    {
        state.paramsIn[DurationIn] = duration;
        state.paramsOut[DurationInSamplesOut] = plonk::max (DurationType (1), DurationType (duration * data.base.sampleRate));
        plonk_assert (state.paramsOut[DurationInSamplesOut] > 0 && 
                      state.paramsOut[DurationInSamplesOut] <= state.bufferLengthIndex);
    }
    
    static inline void param2Ignore (Data&, DelayState&, CoeffType const&) throw() { }
    static inline void param2Process (Data&, DelayState& state, CoeffType const& decay) throw()
    {                                
        state.paramsOut[CoeffIn] = state.paramsOut[CoeffOut] = decay; // probably faster not to check...
    }
    
    template<InputFunction inputFunction, 
             ReadFunction readFunction,
             WriteFunction writeFunction,
             OutputFunction outputFunction>
    static inline void tick (Data& data, DelayState& state) throw()
    {
        inputFunction (data, state);
        readFunction (data, state);
        writeFunction (data, state);
        outputFunction (data, state);
    }
    
    static inline UnitType ar (UnitType const& input,
                               DurationUnitType const& duration,
                               CoeffUnitType const& coeff,
                               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 numCoeffChannels = coeff.getNumChannels();
        const int numChannels = plonk::max (numInputChannels, numDurationChannels, numCoeffChannels);
        
        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::Coeffs, coeff[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 AllpassFFFBUnit
{
public:    
    typedef DelayFormAllpassFFFB<SampleType,InterpTypeCode>     FormType;
    
    typedef Delay2ParamChannelInternal<FormType>                DelayInternal;
    typedef UnitBase<SampleType>                                UnitType;
    typedef InputDictionary                                     Inputs;
    
    typedef typename DelayInternal::Param1Type                  DurationType;
    typedef UnitBase<DurationType>                              DurationUnitType;
    
    typedef typename DelayInternal::Param2Type                  CoeffType;
    typedef UnitBase<CoeffType>                                 CoeffUnitType;
    
    typedef AllpassFFFBUnit<SampleType, Interp::Lagrange3>      HQ;
    typedef AllpassFFFBUnit<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 feedforward and feeback coefficient directly.",
                         
                         // 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::Coeffs,             Measure::Factor,    0.5,                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),
                        CoeffUnitType const& coeff = CoeffType (0.5),
                        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()
    {             
        return FormType::ar (input, duration, coeff, maximumDuration, mul, add, preferredBlockSize, preferredSampleRate);
    }
    
};

typedef AllpassFFFBUnit<PLONK_TYPE_DEFAULT> AllpassFFFB;


#endif // PLONK_DELAYFORMALLPASSFFFB_H