781dd5edb5
All these files were removed since accidental commit, revert and merge in 2.8.ea31f0ac3b+0a4e170c28+11f9a23a28+7b27b10fa6
130 lines
3.0 KiB
C++
130 lines
3.0 KiB
C++
/*******************************************************************************
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* Copyright 2009-2016 Jörg Müller
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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******************************************************************************/
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#pragma once
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/**
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* @file JOSResampleReader.h
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* @ingroup respec
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* The JOSResampleReader class.
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*/
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#include "respec/ResampleReader.h"
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#include "util/Buffer.h"
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AUD_NAMESPACE_BEGIN
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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_API JOSResampleReader : public ResampleReader
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{
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private:
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typedef void (JOSResampleReader::*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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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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Buffer m_buffer;
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/**
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* Double buffer for the sums.
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*/
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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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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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// delete copy constructor and operator=
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JOSResampleReader(const JOSResampleReader&) = delete;
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JOSResampleReader& operator=(const JOSResampleReader&) = delete;
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/**
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* Resets the resampler to its initial state.
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*/
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void AUD_LOCAL 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 AUD_LOCAL updateBuffer(int size, double factor, int samplesize);
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void AUD_LOCAL resample(double target_factor, int length, sample_t* buffer);
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void AUD_LOCAL resample_mono(double target_factor, int length, sample_t* buffer);
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void AUD_LOCAL 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 rate The target sampling rate.
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*/
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JOSResampleReader(std::shared_ptr<IReader> reader, SampleRate rate);
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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 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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AUD_NAMESPACE_END
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