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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 *****
*/
/** \file audaspace/intern/AUD_JOSResampleReader.h
* \ingroup audaspaceintern
*/
#ifndef __AUD_JOSRESAMPLEREADER_H__
#define __AUD_JOSRESAMPLEREADER_H__
#include "AUD_ResampleReader.h"
#include "AUD_Buffer.h"
/**
* This resampling reader uses Julius O. Smith's resampling algorithm.
*/
class AUD_JOSResampleReader : public AUD_ResampleReader
{
private:
typedef void (AUD_JOSResampleReader::*AUD_resample_f)(double target_factor, int length, sample_t* buffer);
/**
* The half filter length.
*/
static const int m_len;
/**
* The sample step size for the filter.
*/
static const int m_L;
/**
* The filter coefficients.
*/
static const float m_coeff[];
/**
* The reader channels.
*/
AUD_Channels m_channels;
/**
* The sample position in the cache.
*/
unsigned int m_n;
/**
* The subsample position in the cache.
*/
double m_P;
/**
* The input data buffer.
*/
AUD_Buffer m_buffer;
/**
* Double buffer for the sums.
*/
AUD_Buffer m_sums;
/**
* How many samples in the cache are valid.
*/
int m_cache_valid;
/**
* Resample function.
*/
AUD_resample_f m_resample;
/**
* Last resampling factor.
*/
double m_last_factor;
// hide copy constructor and operator=
AUD_JOSResampleReader(const AUD_JOSResampleReader&);
AUD_JOSResampleReader& operator=(const AUD_JOSResampleReader&);
/**
* Resets the resampler to its initial state.
*/
void reset();
/**
* Updates the buffer to be as small as possible for the coming reading.
* \param size The size of samples to be read.
* \param factor The next resampling factor.
* \param samplesize The size of a sample.
*/
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:
/**
* Creates a resampling reader.
* \param reader The reader to mix.
* \param specs The target specification.
*/
AUD_JOSResampleReader(boost::shared_ptr<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_H__
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