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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: 20 мая 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_METER_GRAPH_H_
#define LSP_PLUG_IN_DSP_UNITS_UTIL_METER_GRAPH_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
#include <lsp-plug.in/dsp-units/util/ShiftBuffer.h>
namespace lsp
{
namespace dspu
{
enum meter_method_t
{
MM_MAXIMUM,
MM_MINIMUM
};
class LSP_DSP_UNITS_PUBLIC MeterGraph
{
private:
MeterGraph & operator = (const MeterGraph &);
MeterGraph(const MeterGraph &);
protected:
ShiftBuffer sBuffer;
float fCurrent;
size_t nCount;
size_t nPeriod;
bool bMinimize;
public:
explicit MeterGraph();
~MeterGraph();
/**
* Construct object
*/
void construct();
/** Initialize meter graph
*
* @param frames number of frames used for graph and needed to be stored in internal buffer
* @param period strobe period
* @return true on success
*/
bool init(size_t frames, size_t period);
/** Destroy meter graph
*
*/
void destroy();
public:
/**
* Get number of frames
* @return number of frames
*/
inline size_t get_frames() const { return sBuffer.size(); }
/** Set metering method
*
* @param m metering method
*/
inline void set_method(meter_method_t m) { bMinimize = (m == MM_MINIMUM); }
/** Get data stored in buffer
*
* @return pointer to the first element of the buffer
*/
inline float *data() { return sBuffer.head(); }
/** Set strobe period
*
* @param period strobe period
*/
inline void set_period(size_t period)
{
nPeriod = period;
}
/** Process single sample
*
* @param sample sample to process
*/
void process(float sample);
/** Process multiple samples
*
* @param s array of samples
* @param n number of samples to process
*/
void process(const float *s, size_t n);
/** Get current level
*
* @return current level
*/
inline float level() const { return sBuffer.last(); }
/** Fill graph with specific level
*
* @param level level
*/
inline void fill(float level) { sBuffer.fill(level); }
/**
* Dump internal state
* @param v state dumper
*/
void dump(IStateDumper *v) const;
};
}
}
#endif /* LSP_PLUG_IN_DSP_UNITS_UTIL_METER_GRAPH_H_ */
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