JOSResampleReader.h

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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
 
#include "respec/ResampleReader.h"
#include "util/Buffer.h"
 
AUD_NAMESPACE_BEGIN
 
class AUD_API JOSResampleReader : public ResampleReader
{
private:
    typedef void (JOSResampleReader::*resample_f)(double target_factor, int length, sample_t* buffer);
 
    static const int m_len_high;
    static const int m_len_medium;
    static const int m_len_low;
    static const int m_L_high;
    static const int m_L_medium;
    static const int m_L_low;
    static const float m_coeff_high[];
    static const float m_coeff_medium[];
    static const float m_coeff_low[];
 
    int m_len;
 
    int m_L;
 
    const float* m_coeff;
 
    Channels m_channels;
 
    unsigned int m_n;
 
    double m_P;
 
    Buffer m_buffer;
 
    Buffer m_sums;
 
    int m_cache_valid;
 
    resample_f m_resample;
 
    double m_last_factor;
 
    // delete copy constructor and operator=
    JOSResampleReader(const JOSResampleReader&) = delete;
    JOSResampleReader& operator=(const JOSResampleReader&) = delete;
 
    void AUD_LOCAL reset();
 
    void AUD_LOCAL updateBuffer(int size, double factor, int samplesize);
 
    void AUD_LOCAL resample_generic(double target_factor, int length, sample_t* buffer);
    void AUD_LOCAL resample_mono(double target_factor, int length, sample_t* buffer);
    void AUD_LOCAL resample_stereo(double target_factor, int length, sample_t* buffer);
 
    template <typename T>
    void AUD_LOCAL resample(double target_factor, int length, sample_t* buffer);
 
public:
 
    JOSResampleReader(std::shared_ptr<IReader> reader, SampleRate rate, ResampleQuality quality = ResampleQuality::HIGH);
 
    virtual void seek(int position);
    virtual int getLength() const;
    virtual int getPosition() const;
    virtual Specs getSpecs() const;
    virtual void read(int& length, bool& eos, sample_t* buffer);
};
 
AUD_NAMESPACE_END