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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 Threshold.h
* @ingroup fx
* The Threshold class.
*/
#include "fx/Effect.h"
AUD_NAMESPACE_BEGIN
class CallbackIIRFilterReader;
/**
* This sound Transforms any signal to a square signal by thresholding.
*/
class AUD_API Threshold : public Effect
{
private:
/**
* The threshold.
*/
const float m_threshold;
// delete copy constructor and operator=
Threshold(const Threshold&) = delete;
Threshold& operator=(const Threshold&) = delete;
public:
/**
* Creates a new threshold sound.
* \param sound The input sound.
* \param threshold The threshold.
*/
Threshold(std::shared_ptr<ISound> sound, float threshold = 0.0f);
/**
* Returns the threshold.
*/
float getThreshold() const;
virtual std::shared_ptr<IReader> createReader();
/**
* The thresholdFilter function implements the doFilterIIR callback
* for the callback IIR filter.
* @param reader The CallbackIIRFilterReader that executes the callback.
* @param threshold The threshold value.
* @return The filtered sample.
*/
static sample_t AUD_LOCAL thresholdFilter(CallbackIIRFilterReader* reader, float* threshold);
/**
* The endThresholdFilter function implements the endFilterIIR callback
* for the callback IIR filter.
* @param threshold The threshold value.
*/
static void AUD_LOCAL endThresholdFilter(float* threshold);
};
AUD_NAMESPACE_END
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