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/root/src/subsynth/syn/Stream/SampleBufferIStream.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: SampleBufferIStream.h,v $
 * Date modified: $Date: 2002/02/16 19:24:16 $
 * Version:       $Revision: 1.2 $
 * -----------------------------------------------------------------
 *
 ****************** <SYN heading END do not edit this line> ******************/
#ifndef SUBSYNTH_SAMPLEBUF_INPUT_STREAM
#define SUBSYNTH_SAMPLEBUF_INPUT_STREAM

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

namespace syn
{
   class SampleBufferIStream : public AudioIStream
   {
   public:
      SampleBufferIStream() : mIsOpen( false ), mSourceData( NULL ), mSourceSize( 0 ), mDestSize( 0 ), mSeekPosition( 0 )
      {

      }
      virtual ~SampleBufferIStream(){}

      void setSampleBuf( const void* buf, unsigned int size, const syn::AudioFormat& fmt )
      {
         mSourceData = (float*)buf;
         mSourceFormat = fmt;
         mSourceSize = size;
      }      
      
      
      virtual bool open( const syn::AudioFormat& fmt, Operation op = COPY )
      {
         mState = op;
         mIsOpen = true;
         mDestFormat = fmt;
         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);
         samples = (samples > (mDestSize - mSeekPosition)) ? (mDestSize - mSeekPosition) : samples;
         
         // this isn't very flexible.
         assert( mDestFormat == mSourceFormat );
         assert( mDestFormat.datatype == AudioFormat::FLOAT32 );
         
         float* float_data = (float*)data;
         if (mState == ADD)
         for (unsigned int x = 0; x < samples; ++x)
            float_data[x] += mSourceData[x];
                     
         else if (mState == SUB)
         for (unsigned int x = 0; x < samples; ++x)
            float_data[x] -= mSourceData[x];
         
         // TODO: do a memcpy if mSourceFormat == mDestFormat and state == COPY
         else if (mState == COPY)
         for (unsigned int x = 0; x < samples; ++x)
            float_data[x] = mSourceData[x];
            
         else if (mState == MUL)
         for (unsigned int x = 0; x < samples; ++x)
            float_data[x] *= mSourceData[x];

         mSampsRead = samples;
         mSeekPosition += mSampsRead;
      }
      
      virtual bool close()
      {
         mIsOpen = false;
         return mIsOpen == false;
      }

      virtual bool isOpen() const { return mIsOpen; }
      virtual bool eof() const { return mSeekPosition >= mDestSize; }
      virtual bool good() const { return mIsOpen; }
      virtual bool bad() const { return !mIsOpen; }
      
      virtual int gcount() const
      {
         return mSampsRead;
      }

      virtual const AudioFormat& format() const { return mDestFormat; }
   private:
      bool mIsOpen;
      int mSampsRead;
      AudioFormat mSourceFormat, mDestFormat; 
      float* mSourceData;
      unsigned int mSourceSize, mDestSize;
      unsigned int mSeekPosition;
   };
}

#endif

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