AUD_AccumulatorFactory.cpp

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/*
 * $Id: AUD_AccumulatorFactory.cpp 35141 2011-02-25 10:21:56Z jesterking $
 *
 * ***** 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 *****
 */

#include "AUD_AccumulatorFactory.h"
#include "AUD_CallbackIIRFilterReader.h"

sample_t accumulatorFilterAdditive(AUD_CallbackIIRFilterReader* reader, void* useless)
{
        float in = reader->x(0);
        float lastin = reader->x(-1);
        float out = reader->y(-1) + in - lastin;
        if(in > lastin)
                out += in - lastin;
        return out;
}

sample_t accumulatorFilter(AUD_CallbackIIRFilterReader* reader, void* useless)
{
        float in = reader->x(0);
        float lastin = reader->x(-1);
        float out = reader->y(-1);
        if(in > lastin)
                out += in - lastin;
        return out;
}

AUD_AccumulatorFactory::AUD_AccumulatorFactory(AUD_IFactory* factory,
                                                                                           bool additive) :
                AUD_EffectFactory(factory),
                m_additive(additive)
{
}

AUD_IReader* AUD_AccumulatorFactory::createReader() const
{
        return new AUD_CallbackIIRFilterReader(getReader(), 2, 2,
                                                        m_additive ? accumulatorFilterAdditive : accumulatorFilter);
}