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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "fx/Accumulator.h"
#include "fx/CallbackIIRFilterReader.h"
AUD_NAMESPACE_BEGIN
sample_t Accumulator::accumulatorFilterAdditive(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 Accumulator::accumulatorFilter(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;
}
Accumulator::Accumulator(std::shared_ptr<ISound> sound,
bool additive) :
Effect(sound),
m_additive(additive)
{
}
std::shared_ptr<IReader> Accumulator::createReader()
{
return std::shared_ptr<IReader>(new CallbackIIRFilterReader(getReader(), 2, 2, m_additive ? accumulatorFilterAdditive : accumulatorFilter));
}
AUD_NAMESPACE_END
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