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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 CallbackIIRFilterReader.h
* @ingroup fx
* The CallbackIIRFilterReader class.
*/
#include "fx/BaseIIRFilterReader.h"
AUD_NAMESPACE_BEGIN
class CallbackIIRFilterReader;
/**
* The doFilterIIR callback is executed when a new sample of a callback filter
* should be calculated. For sample access the CallbackIIRFilterReader is
* provided. Furthermore a user defined pointer is also handed to the callback.
*/
typedef sample_t (*doFilterIIR)(CallbackIIRFilterReader*, void*);
/**
* The endFilterIIR callback is called when the callback filter is not needed
* anymore. The goal of this function should be to clean up the data behind the
* user supplied pointer which is handed to the callback.
*/
typedef void (*endFilterIIR)(void*);
/**
* This class provides an interface for infinite impulse response filters via a
* callback filter function.
*/
class AUD_API CallbackIIRFilterReader : public BaseIIRFilterReader
{
private:
/**
* Filter function.
*/
const doFilterIIR m_filter;
/**
* End filter function.
*/
const endFilterIIR m_endFilter;
/**
* Data pointer.
*/
void* m_data;
// delete copy constructor and operator=
CallbackIIRFilterReader(const CallbackIIRFilterReader&) = delete;
CallbackIIRFilterReader& operator=(const CallbackIIRFilterReader&) = delete;
public:
/**
* Creates a new callback IIR filter reader.
* \param reader The reader to read from.
* \param in The count of past input samples needed.
* \param out The count of past output samples needed.
* \param doFilter The filter callback.
* \param endFilter The finishing callback.
* \param data Data pointer for the callbacks.
*/
CallbackIIRFilterReader(std::shared_ptr<IReader> reader, int in, int out, doFilterIIR doFilter, endFilterIIR endFilter = 0, void* data = nullptr);
virtual ~CallbackIIRFilterReader();
virtual sample_t filter();
};
AUD_NAMESPACE_END
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