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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.
******************************************************************************/
#pragma once
/**
* @file Accumulator.h
* @ingroup fx
* The Accumulator class.
*/
#include "fx/Effect.h"
AUD_NAMESPACE_BEGIN
class CallbackIIRFilterReader;
/**
* This sound creates an accumulator reader.
*
* The accumulator adds the difference at the input to the last output in case
* it's positive. In additive mode it additionaly adds the difference always.
* So in case the difference is positive, it's added twice.
*/
class AUD_API Accumulator : public Effect
{
private:
/**
* Whether the accumulator is additive.
*/
const bool m_additive;
// delete copy constructor and operator=
Accumulator(const Accumulator&) = delete;
Accumulator& operator=(const Accumulator&) = delete;
public:
/**
* Creates a new accumulator sound.
* \param sound The input sound.
* \param additive Whether the accumulator is additive.
*/
Accumulator(std::shared_ptr<ISound> sound, bool additive = false);
virtual std::shared_ptr<IReader> createReader();
/**
* The accumulatorFilterAdditive function implements the doFilterIIR callback
* for the additive accumulator filter.
* @param reader The CallbackIIRFilterReader that executes the callback.
* @param useless A user defined pointer that is not needed for this filter.
* @return The filtered sample.
*/
static sample_t AUD_LOCAL accumulatorFilterAdditive(CallbackIIRFilterReader* reader, void* useless);
/**
* The accumulatorFilter function implements the doFilterIIR callback
* for the non-additive accumulator filter.
* @param reader The CallbackIIRFilterReader that executes the callback.
* @param useless A user defined pointer that is not needed for this filter.
* @return The filtered sample.
*/
static sample_t AUD_LOCAL accumulatorFilter(CallbackIIRFilterReader* reader, void* useless);
};
AUD_NAMESPACE_END
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