text: /*
   * ***** BEGIN GPL LICENSE BLOCK *****
   *
   * Copyright 2009-2011 Jörg Hermann Müller
   *
   * This file is part of AudaSpace.
   *
   * Audaspace 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.
   *
   * AudaSpace 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 Audaspace; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   *
   * ***** END GPL LICENSE BLOCK *****
   */
  
  /** \file audaspace/FX/AUD_CallbackIIRFilterReader.h
   *  \ingroup audfx
   */
  
  
  #ifndef __AUD_CALLBACKIIRFILTERREADER_H__
  #define __AUD_CALLBACKIIRFILTERREADER_H__
  
  #include "AUD_BaseIIRFilterReader.h"
  #include "AUD_Buffer.h"
  
  class AUD_CallbackIIRFilterReader;
  
  typedef sample_t (*doFilterIIR)(AUD_CallbackIIRFilterReader*, void*);
  typedef void (*endFilterIIR)(void*);
  
  /**
   * This class provides an interface for infinite impulse response filters via a
   * callback filter function.
   */
  class AUD_CallbackIIRFilterReader : public AUD_BaseIIRFilterReader
  {
  private:
  	/**
  	 * Filter function.
  	 */
  	const doFilterIIR m_filter;
  
  	/**
  	 * End filter function.
  	 */
  	const endFilterIIR m_endFilter;
  
  	/**
  	 * Data pointer.
  	 */
  	void* m_data;
  
  	// hide copy constructor and operator=
  	AUD_CallbackIIRFilterReader(const AUD_CallbackIIRFilterReader&);
  	AUD_CallbackIIRFilterReader& operator=(const AUD_CallbackIIRFilterReader&);
  
  public:
  	/**
  	 * Creates a new callback IIR filter reader.
  	 * \param reader The reader to read from.
  	 * \param in The count of past input samples needed.
  	 * \param out The count of past output samples needed.
  	 * \param doFilter The filter callback.
  	 * \param endFilter The finishing callback.
  	 * \param data Data pointer for the callbacks.
  	 */
  	AUD_CallbackIIRFilterReader(boost::shared_ptr<AUD_IReader> reader, int in, int out,
  								doFilterIIR doFilter,
  								endFilterIIR endFilter = 0,
  								void* data = NULL);
  
  	virtual ~AUD_CallbackIIRFilterReader();
  
  	virtual sample_t filter();
  };
  
  #endif //__AUD_CALLBACKIIRFILTERREADER_H__
  