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/root/src/subsynth/syn/Stream/OscIStream.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: OscIStream.h,v $
 * Date modified: $Date: 2002/04/08 16:13:28 $
 * Version:       $Revision: 1.4 $
 * -----------------------------------------------------------------
 *
 ****************** <SYN heading END do not edit this line> ******************/
#ifndef SUBSYNTH_FUNC_GEN_INPUT_STREAM
#define SUBSYNTH_FUNC_GEN_INPUT_STREAM

#include <vector>
#include "syn/Util/AudioFormat.h"
#include "syn/Util/Generator.h"
#include "syn/Stream/AudioIStream.h"


namespace syn
{
   template <typename OSC_TYPE>
   class OscIStream : public AudioIStream
   {
   public:
      OscIStream() : mIsOpen( false ), mAmplitude( 1.0f ), mDcOffset( 0.0f ), mFreq( 80.0f )
      {

      }
      virtual ~OscIStream(){}

      virtual bool open( const syn::AudioFormat& fmt, Operation op = COPY )
      {
         mIsOpen = true;
         mSourceFormat = mDestFormat = fmt;
         mSourceFormat.channels = 1;
         mSourceFormat.datatype = AudioFormat::FLOAT32;
         mOsc.setSampRate( fmt.samplingRateHz );
         return mIsOpen == true;
      }

      virtual void read( void* data, unsigned int samples )
      {
         //std::cout<<" request: "<<samples<<std::flush;

         // handle the case where dest channels is different than src channels.
         // if we are converting to more channles, then we only need to read half as much
         // if we are converting to less channles, then we need to read twice as many samples...
         samples = (unsigned int)((float)samples * (float)mSourceFormat.channels / (float)mDestFormat.channels);

         if (samples > mBuffer.size())
            mBuffer.resize( samples );

         // dump the func generated samples to the buffer of FLOAT32s.
         for (unsigned int x = 0; x < samples; ++x)
         {
            mBuffer[x] = audio_clamp<float>( mOsc.generate() * mAmplitude + mDcOffset );
         }

         syn::audio_convert( mSourceFormat, mDestFormat,
                             (char*)&mBuffer[0], samples, data, mSampsRead );
         //std::cout<<" input:"<<samples<<" output:"<<mSampsRead<<"\n"<<std::flush;
      }
      
      int numsamps()
      {
         return mOsc.samplesPerOsc();
      }

      virtual bool close()
      {
         mBuffer.clear();
         mBuffer.resize( 0 );
         mIsOpen = false;
         return mIsOpen == false;
      }

      virtual bool isOpen() const { return mIsOpen; }
      virtual bool eof() const { return false; }
      virtual bool good() const { return mIsOpen; }
      virtual bool bad() const { return !mIsOpen; }
      
      virtual int gcount() const
      {
         return mSampsRead;
      }

      /* TODO: should these take a buffer of samples? */
      virtual void setFreq( float freq ) 
      { 
         mFreq = freq;
         mOsc.setFreq( mFreq );
      }
      virtual void setAmp( float amplitude ) { mAmplitude = amplitude; }
      virtual void setPhase( float phase ) { mPhase = phase; }
      virtual void setDcOffset( float off ) { mDcOffset = off; }
      virtual const AudioFormat& format() const { return mDestFormat; }
   protected:
      bool mIsOpen;
      int mSampsRead;

      AudioFormat mSourceFormat, mDestFormat;
      std::vector<float> mBuffer;

      /* func gen attributes. */
      float mAmplitude, mDcOffset;
      float mPhase;
      float mFreq;
      float p, dp;
      OSC_TYPE mOsc;
   };
}

#endif

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