/*
 * Copyright (c) 2007 by Hernan Ordiales <audiocode@uint8.com.ar>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef _DCRemoval_
#define _DCRemoval_

#include <CLAM/Processing.hxx>
#include <CLAM/Audio.hxx>
#include <CLAM/AudioInPort.hxx>
#include <CLAM/AudioOutPort.hxx>

namespace CLAM{

	/**	\brief Simple DC removal
	 *
	 *	DC removal (vertically centered)
	 */
	class DCRemoval: public Processing
	{	
		/** This method returns the name of the object
		 *  @return Char pointer with the name of object
		 */
		const char *GetClassName() const { return "DCRemoval"; }
		
		/** Ports **/
		AudioInPort mInputAudio;
		AudioOutPort mOutputAudio;

		TData mMean;
	public:
		DCRemoval(const Config & config=Config())
			:
			mInputAudio("Input Audio",this ),
			mOutputAudio("Audio Output",this)
		{
			Configure( config );

			mMean = 0.;
		}

 		~DCRemoval() {}

		bool Do()
		{
			bool result = Do( mInputAudio.GetAudio(), mOutputAudio.GetAudio() );

			mInputAudio.Consume(); 
			mOutputAudio.Produce();

			return result;
		}
	
		bool Do(const Audio& in, Audio& out)
		{
			int size = in.GetSize();
			const DataArray& inb = in.GetBuffer();
			DataArray& outb = out.GetBuffer();

			TData mean=0.;
			for (int i=0;i<size;i++)
			{
				mean += inb[i];
			}
			mMean = ( mMean + mean/TData(size) )/2.; //previous mean, soft change
// 			mMean = mean/TData(size).;

			for (int i=0;i<size;i++) 
			{
				outb[i] = inb[i] - mMean; //removing DC value
			}

			return true;
		}
};	
	
};//namespace CLAM

#endif // _DCRemoval_
