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/root/src/subsynth/syn/Module/FilterModule.h

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/****************** <SYN heading BEGIN do not edit this line> *****************
 *
 * subsynth - modular audio synthesizer
 * subsynth is (C) Copyright 2001-2002 by Kevin Meinert
 *
 * Original Author: Kevin Meinert
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * -----------------------------------------------------------------
 * File:          $RCSfile: FilterModule.h,v $
 * Date modified: $Date: 2002/04/15 07:28:46 $
 * Version:       $Revision: 1.6 $
 * -----------------------------------------------------------------
 *
 ****************** <SYN heading END do not edit this line> ******************/

#ifndef SUBSYNTH_FILTER_MODULE_H
#define SUBSYNTH_FILTER_MODULE_H

#include <map>
#include "syn/Core/SampleBuffer.h"
#include "syn/Core/SampleBufferQueue.h"
#include "syn/Core/Module.h"
#include "syn/Core/Terminal.h"

#include "syn/Util/Filter.h" // for the filter

namespace syn
{
   class FilterModule : public Module
   {
   public:
      FilterModule();
   
      virtual ~FilterModule();

      virtual void update();

      virtual bool open();

      virtual bool isOpen();
     
      virtual void close();

      virtual Module* clone() const
      {
         FilterModule* mod = new FilterModule;
         mod->setFilterType( this->filterType() );
         mod->setCutoff( this->cutoff() );
         mod->setCutoffLo( this->cutoffLo() );
         mod->setCutoffHi( this->cutoffHi() );
         return mod;
      }

   public:
         
      enum FilterType
      {
         NONE, LP, LP2, HP, LPFIR
      };
      void setFilterType( FilterType t )
      {
         mFilterType = t;
         this->setCutoff( mCutoff );
      }
      FilterType filterType() const { return mFilterType; }
      
      void setCutoff( float value = 1.0f )
      {
         mCutoff = Math::abs( value );
         if (mCutoff > 1.0f) mCutoff = 1.0f;
         float lerpedHz = mCutoffLo + ((mCutoffHi - mCutoffLo) * mCutoff);
         //std::cout<<"cutoff freq: "<<lerpedHz<<" Fc: "<<lerpedHz/44100.0f<<std::endl;
         
         switch (mFilterType)
         {
         case LP:
            mSimpleLpFilter.setCutoff( lerpedHz, 44100.0f );
            break;
         case LP2:
            mSimpleLP.setCutoff( lerpedHz, 44100.0f );
            break;
         case HP:
            mSimpleHpFilter.setCutoff( lerpedHz, 44100.0f );
            break;
         case LPFIR:
            mFirFilter.setCutoff( lerpedHz, 44100.0f );
            break;
         }
      }

      void setCutoffLo( float hz = 220.0f )
      {
         mCutoffLo = Math::abs( hz );
         this->setCutoff( mCutoff ); // refresh
      }

      void setCutoffHi( float hz = 22050.0f )
      {
         mCutoffHi = Math::abs( hz );
         this->setCutoff( mCutoff ); // refresh
      }            
      
      float cutoff() const { return mCutoff; }
      float cutoffLo() const { return mCutoffLo; }
      float cutoffHi() const { return mCutoffHi; }
      
      virtual void getParam( const std::string& key, MultivariateType& value )
      {
         if (key == "cutoff")
            value.setValue<float>( this->cutoff() );
         else if (key == "cutoffLo")
            value.setValue<float>( this->cutoffLo() );
         else if (key == "cutoffHi")
            value.setValue<float>( this->cutoffHi() );
         else if (key == "filter")
            value.setValue<unsigned int>( this->filterType() );
      }

      virtual void setParam( const std::string& key, const MultivariateType& value )
      {
         if (key == "cutoff")
            this->setCutoff( value.getValue<float>() );
         else if (key == "cutoffLo")
            this->setCutoffLo( value.getValue<float>() );
         else if (key == "cutoffHi")
            this->setCutoffHi( value.getValue<float>() );
         else if (key == "filter")
            this->setFilterType( (FilterType)value.getValue<unsigned int>() );
      }
      
   private:
      TerminalPtr mMonoAudioInput;
      TerminalPtr mMonoAudioOutput;

      SampleBuffer1f* mWriteBuf;
      
      FirFilter mFirFilter;
      SimpleLowPass mSimpleLpFilter;
      SimpleHighPass mSimpleHpFilter;
      SimpleLP mSimpleLP;
      
      float mCutoff, mCutoffLo, mCutoffHi;
      FilterType mFilterType;
      


      /*#  Terminal lnkTerminal; */

      /*#  Terminal lnkTerminal; */
   };  
}
#endif

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