AUD_JOSResampleReader.h

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef AUD_JOSRESAMPLEREADER
#define AUD_JOSRESAMPLEREADER

#include "AUD_ResampleReader.h"
#include "AUD_Buffer.h"

class AUD_JOSResampleReader : public AUD_ResampleReader
{
private:
    typedef void (AUD_JOSResampleReader::*AUD_resample_f)(double target_factor, int length, sample_t* buffer);

    static const int m_len;

    static const int m_L;

    static const float m_coeff[];

    AUD_Channels m_channels;

    unsigned int m_n;

    double m_P;

    AUD_Buffer m_buffer;

    AUD_Buffer m_sums;

    int m_cache_valid;

    AUD_resample_f m_resample;

    double m_last_factor;

    // hide copy constructor and operator=
    AUD_JOSResampleReader(const AUD_JOSResampleReader&);
    AUD_JOSResampleReader& operator=(const AUD_JOSResampleReader&);

    void reset();

    void updateBuffer(int size, double factor, int samplesize);

    void resample(double target_factor, int length, sample_t* buffer);
    void resample_mono(double target_factor, int length, sample_t* buffer);
    void resample_stereo(double target_factor, int length, sample_t* buffer);

public:
    AUD_JOSResampleReader(AUD_Reference<AUD_IReader> reader, AUD_Specs specs);

    virtual void seek(int position);
    virtual int getLength() const;
    virtual int getPosition() const;
    virtual AUD_Specs getSpecs() const;
    virtual void read(int& length, bool& eos, sample_t* buffer);
};

#endif //AUD_JOSRESAMPLEREADER