plonk_FilterCoeffs1Param.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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 * Redistributions of source code must retain the above copyright
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 * Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
 * 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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 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF THE WEST OF ENGLAND, BRISTOL BE 
 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
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 This software makes use of third party libraries. For more information see:
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 -------------------------------------------------------------------------------
 */

#ifndef PLONK_FILTERCOEFFS1PARAM_H
#define PLONK_FILTERCOEFFS1PARAM_H

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



template<class ShapeType>
class FilterCoeffs1ParamChannelInternal 
:   public ProxyOwnerChannelInternal<typename ShapeType::SampleDataType, 
                                     typename ShapeType::Data>
{
public:
    typedef typename ShapeType::SampleDataType                  SampleType;
    typedef typename ShapeType::Data                            Data;
    typedef typename ShapeType::FormType                        FormType;
    
    typedef ChannelBase<SampleType>                             ChannelType;
    typedef ObjectArray<ChannelType>                            ChannelArrayType;
        
    typedef ProxyOwnerChannelInternal<SampleType,Data>          Internal;
    typedef UnitBase<SampleType>                                UnitType;
    typedef InputDictionary                                     Inputs;
    typedef NumericalArray<SampleType>                          Buffer;
        
    FilterCoeffs1ParamChannelInternal (Inputs const& inputs, 
                                       Data const& data, 
                                       BlockSize const& blockSize,
                                       SampleRate const& sampleRate,
                                       ChannelArrayType& channels) throw()
    :   Internal (FormType::NumCoeffs, inputs, data, blockSize, sampleRate, channels),
        inputKeys (ShapeType::getInputKeys())
    {
        plonk_assert (ShapeType::NumParams == 1);

        SampleRate& filterSampleRate = this->getInputAsSampleRate (IOKey::FilterSampleRate);
        filterSampleRate.addReceiver (this);
        
        updateFilterSampleRateInData();
    }
    
    ~FilterCoeffs1ParamChannelInternal()
    {
        SampleRate& filterSampleRate = this->getInputAsSampleRate (IOKey::FilterSampleRate);
        filterSampleRate.removeReceiver (this);
    }
            
    Text getName() const throw()
    {
        return "Filter Coeffs 1 Param (" + ShapeType::getFormName() + " / " + ShapeType::getShapeName() + ")";
    }       
    
    IntArray getInputKeys() const throw()
    {
        return inputKeys;
    }    
        
    void initChannel (const int channel) throw()
    {        
        plonk_assert (ShapeType::NumParams == 1);

        UnitType& param0Unit = this->getInputAsUnit (inputKeys.atUnchecked (0));
        plonk_assert (param0Unit.getOverlap (0) == Math<DoubleVariable>::get1());

        if ((channel % this->getNumChannels()) == 0)
        {
            this->setBlockSize (BlockSize::decide (param0Unit.getBlockSize (0),
                                                   this->getBlockSize()));
            this->setSampleRate (SampleRate::decide (param0Unit.getSampleRate (0),
                                                     this->getSampleRate()));
            
            Data& data = this->getState();
            data.params[0] = param0Unit.getValue (0);
            
            ShapeType::calculate (data);
            
            for (int i = 0; i < FormType::NumCoeffs; ++i)
                this->initProxyValue (i, data.coeffs[i]);            
        }
    }    
    
    void changed (DoubleVariable::Sender const& source, Text const& message, Dynamic const& payload) throw()
    {        
        SampleRate sampleRateSource = static_cast<SampleRate> (source);
        
        if (sampleRateSource == this->getInputAsSampleRate (IOKey::FilterSampleRate))
        {
            this->updateFilterSampleRateInData();
            return;
        }
                
        Internal::changed (source, message, payload); // process others
    }    
    
    void updateFilterSampleRateInData() throw()
    {
        const SampleRate& filterSampleRate = this->getInputAsSampleRate (IOKey::FilterSampleRate);
        Data& data = this->getState();

        const double sampleRate = filterSampleRate.getValue();
        
        data.filterSampleRate = sampleRate;
        data.filterSampleDuration = 1.0 / sampleRate;
    }
    
    void process (ProcessInfo& info, const int /*channel*/) throw()
    {   
        int i, j;

        Data& data = this->getState();
                            
        const int outputLength = this->getOutputBuffer (0).length();
            
        UnitType& param0Unit = this->getInputAsUnit (inputKeys.atUnchecked (0));
        
        const Buffer& param0Buffer (param0Unit.process (info, 0));
        const SampleType* const param0Samples = param0Buffer.getArray();
        const int param0Length = param0Buffer.length();
        
        if (outputLength == param0Length)
        {
            for (i = 0; i < outputLength; ++i)
            {
                data.params[0] = param0Samples[i];
                
                ShapeType::calculate (data);
                
                for (j = 0; j < FormType::NumCoeffs; ++j)
                    this->getOutputSamples (j) [i] = data.coeffs[j];
            }
        }
        else if (param0Length == 1)
        {
            data.params[0] = param0Samples[0];

            ShapeType::calculate (data);

            for (j = 0; j < FormType::NumCoeffs; ++j)
            {
                SampleType* const samples = this->getOutputSamples (j);
                const SampleType coeff = data.coeffs[j];
                
                for (i = 0; i < outputLength; ++i)
                    samples[i] = coeff;                
            }            
        }
        else
        {
            double param0Position = 0.0;
            const double param0Increment = double (param0Length) / double (outputLength);
            
            for (i = 0; i < outputLength; ++i)
            {
                data.params[0] = param0Samples[int (param0Position)];
                
                ShapeType::calculate (data);
                
                for (j = 0; j < FormType::NumCoeffs; ++j)
                    this->getOutputSamples (j) [i] = data.coeffs[j];
                
                param0Position += param0Increment;
            }
        }
    }
    
private:
    IntArray inputKeys;
};





template<class ShapeType>
class FilterCoeffs1ParamUnit
{
public:        
    typedef typename ShapeType::SampleDataType              SampleType;
    typedef typename ShapeType::Data                        Data;
    typedef typename ShapeType::FormType                    FormType;
    
    typedef FilterCoeffs1ParamChannelInternal<ShapeType>    FilterCoeffsInternal;
    typedef ChannelBase<SampleType>                         ChannelType;
    typedef ChannelInternal<SampleType,Data>                Internal;
    typedef UnitBase<SampleType>                            UnitType;
    typedef InputDictionary                                 Inputs;
    
    static inline UnitInfos getInfo() throw()
    {
        const double sampleRate = SampleRate::getDefault().getValue();
        
        return UnitInfo ("Filter Coeffs 1 Param", "Filter coefficients generator for an IIR filter using one control parameter.",
                         
                         // output
                         FormType::NumCoeffs, 
                         IOKey::Coeffs,             Measure::Coeffs,    0.0,                IOLimit::None,
                         IOKey::End,
                         
                         // inputs
                         IOKey::Generic,            Measure::Unknown,   IOInfo::NoDefault,  IOLimit::None,
                         IOKey::FilterSampleRate,   Measure::Hertz,     sampleRate,         IOLimit::Minimum,   Measure::Hertz,             0.0,
                         IOKey::BlockSize,          Measure::Samples,   0.0,                IOLimit::Minimum,   Measure::Samples,           1.0,
                         IOKey::SampleRate,         Measure::Hertz,     -1.0,               IOLimit::Minimum,   Measure::Hertz,             0.0,
                         IOKey::End);
    }
    
    
    static UnitType ar (UnitType const& param0,
                        SampleRates const filterSampleRates = SampleRate::getDefault(),
                        BlockSize const& preferredBlockSize = BlockSize::noPreference(),
                        SampleRate const& preferredSampleRate = SampleRate::noPreference()) throw()
    {                
        const IntArray inputKeys = ShapeType::getInputKeys();
        
        plonk_assert (inputKeys.length() == 1);
        
        const int numInputChannels = param0.getNumChannels();
        const int numSampleRates = filterSampleRates.length();
        const int numChannels = filterSampleRates.areAllEqual() ? numInputChannels : plonk::max (numInputChannels, numSampleRates);
        UnitType result (UnitType::emptyWithAllocatedSize (numChannels * FormType::NumCoeffs));
        
        Data data;
        Memory::zero (data);
        data.base.sampleRate = -1.0;
        data.base.sampleDuration = -1.0;
        
        for (int i = 0; i < numChannels; ++i)
        {
            Inputs inputs;
            inputs.put (inputKeys.atUnchecked (0), param0[i]);
            inputs.put (IOKey::FilterSampleRate, filterSampleRates.wrapAt (i));
            
            result.add (UnitType::template proxiesFromInputs<FilterCoeffsInternal> (inputs, 
                                                                                    data, 
                                                                                    preferredBlockSize, 
                                                                                    preferredSampleRate));
        }
        
        return result;
    }
};




#endif // PLONK_FILTERCOEFFS1PARAM_H