110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
/*
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Copyright (C) 2008 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __JackResampler__
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#define __JackResampler__
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#include "ringbuffer.h"
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#include "types.h"
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namespace Jack
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{
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#define DEFAULT_RB_SIZE 32768
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#define DEFAULT_ADAPTATIVE_SIZE 2048
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inline float Range(float min, float max, float val)
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{
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return (val < min) ? min : ((val > max) ? max : val);
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}
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/*!
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\brief Base class for RingBuffer in frames.
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*/
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class JackRingBuffer
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{
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protected:
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jack_ringbuffer_t* fRingBuffer;
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unsigned int fRingBufferSize;
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public:
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JackRingBuffer(int size = DEFAULT_RB_SIZE);
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virtual ~JackRingBuffer();
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virtual void Reset(unsigned int new_size);
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// in frames
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virtual unsigned int Read(jack_default_audio_sample_t* buffer, unsigned int frames);
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virtual unsigned int Write(jack_default_audio_sample_t* buffer, unsigned int frames);
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// in bytes
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virtual unsigned int Read(void* buffer, unsigned int bytes);
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virtual unsigned int Write(void* buffer, unsigned int bytes);
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// in frames
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virtual unsigned int ReadSpace();
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virtual unsigned int WriteSpace();
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unsigned int GetError()
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{
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return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float)) - (fRingBufferSize / 2);
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}
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};
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/*!
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\brief Base class for Resampler.
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*/
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class JackResampler : public JackRingBuffer
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{
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protected:
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double fRatio;
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public:
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JackResampler():JackRingBuffer(),fRatio(1)
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{}
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virtual ~JackResampler()
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{}
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virtual unsigned int ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames);
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virtual unsigned int WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames);
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void SetRatio(double ratio)
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{
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fRatio = Range(0.25, 4.0, ratio);
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}
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double GetRatio()
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{
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return fRatio;
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}
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};
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}
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#endif
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