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/*
Copyright (C) 2008 Grame
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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __JackResampler__
#define __JackResampler__
#include "ringbuffer.h"
#include "types.h"
namespace Jack
{
#define DEFAULT_RB_SIZE 32768
#define DEFAULT_ADAPTATIVE_SIZE 2048
inline float Range(float min, float max, float val)
{
return (val < min) ? min : ((val > max) ? max : val);
}
/*!
\brief Base class for RingBuffer in frames.
*/
class JackRingBuffer
{
protected:
jack_ringbuffer_t* fRingBuffer;
unsigned int fRingBufferSize;
public:
JackRingBuffer(int size = DEFAULT_RB_SIZE);
virtual ~JackRingBuffer();
virtual void Reset(unsigned int new_size);
// in frames
virtual unsigned int Read(jack_default_audio_sample_t* buffer, unsigned int frames);
virtual unsigned int Write(jack_default_audio_sample_t* buffer, unsigned int frames);
// in bytes
virtual unsigned int Read(void* buffer, unsigned int bytes);
virtual unsigned int Write(void* buffer, unsigned int bytes);
// in frames
virtual unsigned int ReadSpace();
virtual unsigned int WriteSpace();
unsigned int GetError()
{
return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float)) - (fRingBufferSize / 2);
}
};
/*!
\brief Base class for Resampler.
*/
class JackResampler : public JackRingBuffer
{
protected:
double fRatio;
public:
JackResampler():JackRingBuffer(),fRatio(1)
{}
virtual ~JackResampler()
{}
virtual unsigned int ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames);
virtual unsigned int WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames);
void SetRatio(double ratio)
{
fRatio = Range(0.25, 4.0, ratio);
}
double GetRatio()
{
return fRatio;
}
};
}
#endif
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