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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-units
* Created on: 19 нояб. 2016 г.
*
* lsp-dsp-units is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-units 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-units. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_DSP_UNITS_UTIL_OVERSAMPLER_H_
#define LSP_PLUG_IN_DSP_UNITS_UTIL_OVERSAMPLER_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
#include <lsp-plug.in/dsp-units/filters/Filter.h>
namespace lsp
{
namespace dspu
{
/** Callback to perform processing of oversampled signal
*
*/
class LSP_DSP_UNITS_PUBLIC IOversamplerCallback
{
public:
/** Virtual destructor
*
*/
virtual ~IOversamplerCallback();
/** Processing routine
*
* @param out output buffer of samples size
* @param in input buffer of samples size
* @param samples number of samples to process
*/
virtual void process(float *out, const float *in, size_t samples);
};
enum over_mode_t
{
OM_NONE,
OM_LANCZOS_2X2,
OM_LANCZOS_2X3,
OM_LANCZOS_2X4,
OM_LANCZOS_3X2,
OM_LANCZOS_3X3,
OM_LANCZOS_3X4,
OM_LANCZOS_4X2,
OM_LANCZOS_4X3,
OM_LANCZOS_4X4,
OM_LANCZOS_6X2,
OM_LANCZOS_6X3,
OM_LANCZOS_6X4,
OM_LANCZOS_8X2,
OM_LANCZOS_8X3,
OM_LANCZOS_8X4
};
/** Oversampler class
*
*/
class LSP_DSP_UNITS_PUBLIC Oversampler
{
private:
Oversampler & operator = (const Oversampler &);
Oversampler(const Oversampler &);
protected:
enum update_t
{
UP_MODE = 1 << 0,
UP_SAMPLE_RATE = 1 << 2,
UP_OTHER = 1 << 3,
UP_ALL = UP_MODE | UP_OTHER | UP_SAMPLE_RATE
};
protected:
IOversamplerCallback *pCallback;
float *fUpBuffer;
float *fDownBuffer;
size_t nUpHead;
size_t nMode;
size_t nSampleRate;
size_t nUpdate;
Filter sFilter;
uint8_t *bData;
bool bFilter;
public:
explicit Oversampler();
~Oversampler();
void construct();
public:
/** Initialize oversampler
*
*/
bool init();
/** Destroy oversampler
*
*/
void destroy();
/** Set sample rate
*
* @param sr sample rate
*/
void set_sample_rate(size_t sr);
/** Set oversampling callback
*
* @param callback calback to call on process()
*/
inline void set_callback(IOversamplerCallback *callback)
{
pCallback = callback;
}
/** Set oversampling ratio
*
* @param mode oversampling mode
*/
inline void set_mode(over_mode_t mode)
{
if (mode < OM_NONE)
mode = OM_NONE;
else if (mode > OM_LANCZOS_8X3)
mode = OM_LANCZOS_8X3;
if (nMode == mode)
return;
nMode = mode;
nUpdate |= UP_MODE;
}
/** Enable/disable low-pass filter when performing downsampling
*
* @param filter enables/diables low-pass filter
*/
inline void set_filtering(bool filter)
{
if (bFilter == filter)
return;
bFilter = filter;
nUpdate |= UP_MODE;
}
/** Check that module needs re-configuration
*
* @return true if needs reconfiguration
*/
inline bool modified() const
{
return nUpdate;
}
/** Get current oversampling multiplier
*
* @return current oversampling multiplier
*/
size_t get_oversampling() const;
/** Update settings
*
*/
void update_settings();
/** Perform upsampling of the signal
*
* @param dst destination buffer of samples*ratio size
* @param src source buffer of samples size
* @param samples number of samples that should be processed in src buffer
*/
void upsample(float *dst, const float *src, size_t samples);
/** Perform downsampling of the signal
*
* @param dst destination buffer of samples size
* @param src source buffer of samples*ratio size
* @param samples number of samples that should be produced into the dst buffer
*/
void downsample(float *dst, const float *src, size_t samples);
/** Perform processing of the signal
*
* @param dst destination buffer of samples size
* @param src source buffer of samples size
* @param samples number of samples to process
* @param callback callback to handle buffer
*/
void process(float *dst, const float *src, size_t samples, IOversamplerCallback *callback);
/** Perform processing of the signal
*
* @param dst destination buffer of samples size
* @param src source buffer of samples size
* @param samples number of samples to process
*/
inline void process(float *dst, const float *src, size_t samples)
{
process(dst, src, samples, pCallback);
}
/**
* Get oversampler latency
* @return oversampler latency in normal (non-oversampled) samples
*/
size_t latency() const;
/**
* Get maximum possible latency
* @return maximum possible latency
*/
inline size_t max_latency() const { return 8; }
/**
* Dump the state
* @param dumper dumper
*/
void dump(IStateDumper *v) const;
};
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_DSP_UNITS_UTIL_OVERSAMPLER_H_ */
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