Joerg Mueller
136 lines
3.2 KiB
C++
136 lines
3.2 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* Copyright 2009-2011 Jörg Hermann Müller
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*
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* This file is part of AudaSpace.
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*
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* Audaspace 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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*
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* AudaSpace 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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*
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* You should have received a copy of the GNU General Public License
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* along with Audaspace; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file audaspace/intern/AUD_JOSResampleReader.h
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* \ingroup audaspaceintern
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*/
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#ifndef __AUD_JOSRESAMPLEREADER_H__
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#define __AUD_JOSRESAMPLEREADER_H__
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#include "AUD_ResampleReader.h"
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#include "AUD_Buffer.h"
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/**
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* This resampling reader uses Julius O. Smith's resampling algorithm.
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*/
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class AUD_JOSResampleReader : public AUD_ResampleReader
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{
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private:
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typedef void (AUD_JOSResampleReader::*AUD_resample_f)(double target_factor, int length, sample_t* buffer);
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/**
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* The half filter length.
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*/
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static const int m_len;
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/**
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* The sample step size for the filter.
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*/
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static const int m_L;
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/**
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* The filter coefficients.
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*/
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static const float m_coeff[];
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/**
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* The reader channels.
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*/
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AUD_Channels m_channels;
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/**
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* The sample position in the cache.
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*/
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unsigned int m_n;
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/**
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* The subsample position in the cache.
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*/
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double m_P;
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/**
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* The input data buffer.
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*/
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AUD_Buffer m_buffer;
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/**
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* Double buffer for the sums.
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*/
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AUD_Buffer m_sums;
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/**
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* How many samples in the cache are valid.
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*/
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int m_cache_valid;
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/**
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* Resample function.
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*/
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AUD_resample_f m_resample;
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/**
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* Last resampling factor.
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*/
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double m_last_factor;
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// hide copy constructor and operator=
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AUD_JOSResampleReader(const AUD_JOSResampleReader&);
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AUD_JOSResampleReader& operator=(const AUD_JOSResampleReader&);
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/**
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* Resets the resampler to its initial state.
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*/
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void reset();
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/**
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* Updates the buffer to be as small as possible for the coming reading.
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* \param size The size of samples to be read.
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* \param factor The next resampling factor.
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* \param samplesize The size of a sample.
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*/
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void updateBuffer(int size, double factor, int samplesize);
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void resample(double target_factor, int length, sample_t* buffer);
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void resample_mono(double target_factor, int length, sample_t* buffer);
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void resample_stereo(double target_factor, int length, sample_t* buffer);
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public:
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/**
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* Creates a resampling reader.
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* \param reader The reader to mix.
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* \param specs The target specification.
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*/
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AUD_JOSResampleReader(boost::shared_ptr<AUD_IReader> reader, AUD_Specs specs);
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virtual void seek(int position);
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virtual int getLength() const;
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virtual int getPosition() const;
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virtual AUD_Specs getSpecs() const;
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virtual void read(int& length, bool& eos, sample_t* buffer);
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};
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#endif //__AUD_JOSRESAMPLEREADER_H__
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