Equalizer.h

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/*******************************************************************************
 * Copyright 2022 Marcos Perez Gonzalez
 *
 * 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 <memory>
#include <vector>
 
#include "ISound.h"
#include "ImpulseResponse.h"
 
AUD_NAMESPACE_BEGIN
 
class Buffer;
class ImpulseResponse;
class AUD_API Equalizer : public ISound
{
private:
    std::shared_ptr<ISound> m_sound;

    std::shared_ptr<Buffer> m_bufEQ;

    std::shared_ptr<ImpulseResponse> m_impulseResponse;

    Equalizer(const Equalizer&) = delete;
    Equalizer& operator=(const Equalizer&) = delete;

    std::shared_ptr<ImpulseResponse> createImpulseResponse();

    std::shared_ptr<Buffer> minimumPhaseFilterHomomorphic(std::shared_ptr<Buffer> original, int lOriginal, int lWork);

    std::shared_ptr<Buffer> minimumPhaseFilterHilbert(std::shared_ptr<Buffer> original, int lOriginal, int lWork);
 
public:
    Equalizer(std::shared_ptr<ISound> sound, std::shared_ptr<Buffer> bufEQ, int externalSizeEq, float maxFreqEq, int sizeConversion);
 
    virtual ~Equalizer();
    virtual std::shared_ptr<IReader> createReader();
 
    /*
     * Length of the external equalizer definition. It must be the number of "float" positions of the Buffer
     */
    int external_size_eq;
 
    /*
     * Length of the internal equalizer definition
     */
    int filter_length;
 
    /*
     * Maximum frequency used in the equalizer definition
     */
    float maxFreqEq;
};
 
AUD_NAMESPACE_END