intern/audaspace/FX/AUD_SquareFactory.cpp

   1 /*
   2  * $Id$
   3  *
   4  * ***** BEGIN GPL LICENSE BLOCK *****
   5  *
   6  * Copyright 2009-2011 Jörg Hermann Müller
   7  *
   8  * This file is part of AudaSpace.
   9  *
  10  * Audaspace is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * AudaSpace is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with Audaspace; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  *
  24  * ***** END GPL LICENSE BLOCK *****
  25  */
  26
  27 /** \file audaspace/FX/AUD_SquareFactory.cpp
  28  *  \ingroup audfx
  29  */
  30
  31
  32 #include "AUD_SquareFactory.h"
  33 #include "AUD_CallbackIIRFilterReader.h"
  34
  35 sample_t squareFilter(AUD_CallbackIIRFilterReader* reader, float* threshold)
  36 {
  37         float in = reader->x(0);
  38         if(in >= *threshold)
  39                 return 1;
  40         else if(in <= -*threshold)
  41                 return -1;
  42         else
  43                 return 0;
  44 }
  45
  46 void endSquareFilter(float* threshold)
  47 {
  48         delete threshold;
  49 }
  50
  51 AUD_SquareFactory::AUD_SquareFactory(AUD_IFactory* factory, float threshold) :
  52                 AUD_EffectFactory(factory),
  53                 m_threshold(threshold)
  54 {
  55 }
  56
  57 float AUD_SquareFactory::getThreshold() const
  58 {
  59         return m_threshold;
  60 }
  61
  62 AUD_IReader* AUD_SquareFactory::createReader() const
  63 {
  64         return new AUD_CallbackIIRFilterReader(getReader(), 1, 1,
  65                                                                                    (doFilterIIR) squareFilter,
  66                                                                                    (endFilterIIR) endSquareFilter,
  67                                                                                    new float(m_threshold));
  68 }