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/***************************************************************************
RateConverter.h - single channel sample rate converter
-------------------
begin : Sat Jul 11 2009
copyright : (C) 2009 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* This program 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. *
* *
***************************************************************************/
#ifndef RATE_CONVERTER_H
#define RATE_CONVERTER_H
#include "config.h"
#include "libkwave_export.h"
#include <QtGlobal>
#include <QObject>
#include <QVarLengthArray>
#include <QVariant>
#include <samplerate.h>
#include "libkwave/SampleArray.h"
#include "libkwave/SampleSource.h"
namespace Kwave
{
class LIBKWAVE_EXPORT RateConverter: public Kwave::SampleSource
{
Q_OBJECT
public:
/** Constructor */
RateConverter();
/** Destructor */
~RateConverter() override;
/** does nothing, processing is done in input() */
void goOn() override;
signals:
/** emits a block with the filtered data */
void output(Kwave::SampleArray data);
public slots:
/** receives input data and also directly does the calculation */
void input(Kwave::SampleArray data);
/**
* Sets the conversion ratio, ((new rate) / (old rate))
*/
void setRatio(const QVariant r);
private:
/** conversion ratio, ((new rate) / (old rate)) */
double m_ratio;
/** sample rate converter context for libsamplerate */
SRC_STATE *m_converter;
/** input values for the sample rate converter */
QVarLengthArray<float, 65536> m_converter_in;
/** output values for the sample rate converter */
QVarLengthArray<float, 65536> m_converter_out;
};
}
#endif /* RATE_CONVERTER_H */
//***************************************************************************
//***************************************************************************
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