BaseIIRFilterReader.h

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/*******************************************************************************
 * Copyright 2009-2015 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

#include "fx/EffectReader.h"

AUD_NAMESPACE_BEGIN

class AUD_API BaseIIRFilterReader : public EffectReader
{
private:
    Specs m_specs;

    int m_xlen;

    int m_ylen;

    sample_t* m_x;

    sample_t* m_y;

    int m_xpos;

    int m_ypos;

    int m_channel;

    // delete copy constructor and operator=
    BaseIIRFilterReader(const BaseIIRFilterReader&) = delete;
    BaseIIRFilterReader& operator=(const BaseIIRFilterReader&) = delete;

protected:
    BaseIIRFilterReader(std::shared_ptr<IReader> reader, int in, int out);

    void setLengths(int in, int out);

public:
    inline sample_t x(int pos)
    {
        return m_x[(m_xpos + pos + m_xlen) % m_xlen * m_specs.channels + m_channel];
    }

    inline sample_t y(int pos)
    {
        return m_y[(m_ypos + pos + m_ylen) % m_ylen * m_specs.channels + m_channel];
    }

    virtual ~BaseIIRFilterReader();

    virtual void read(int& length, bool& eos, sample_t* buffer);

    virtual sample_t filter()=0;

    virtual void sampleRateChanged(SampleRate rate);
};

AUD_NAMESPACE_END