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/***************************************************************************
NormalizePlugin.h - plugin for level normalizing
-------------------
begin : Fri May 01 2009
copyright : (C) 2009 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
original algorithms : (C) 1999-2005 Chris Vaill <chrisvaill at gmail>
taken from "normalize-0.7.7"
***************************************************************************/
/***************************************************************************
* *
* This program 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. *
* *
***************************************************************************/
#ifndef NORMALIZE_PLUGIN_H
#define NORMALIZE_PLUGIN_H
#include "config.h"
#include <QString>
#include <QStringList>
#include <QVector>
#include "libkwave/Plugin.h"
#include "libkwave/Sample.h"
#include "libkwave/SampleArray.h"
namespace Kwave
{
class MultiTrackReader;
class SampleReader;
/**
* This is a two-pass plugin that determines the average volume level
* of a signal and then calls the volume plugin to adjust the volume.
*/
class NormalizePlugin: public Kwave::Plugin
{
Q_OBJECT
public:
/**
* Constructor
* @param parent reference to our plugin manager
* @param args argument list [unused]
*/
NormalizePlugin(QObject *parent, const QVariantList &args);
/** Destructor */
~NormalizePlugin() override;
/**
* normalizes the volume
* @param params list of strings with parameters
*/
void run(QStringList params) override;
private:
typedef struct {
QVector<double> fifo; /**< FIFO for power values */
unsigned int wp; /**< FIFO write pointer */
unsigned int n; /**< number of elements in the FIFO */
double sum; /**< sum of queued power values */
double max; /**< maximum power value */
} Average;
/**
* get the maximum power level of the input
*/
double getMaxPower(Kwave::MultiTrackReader &source);
/**
* calculate the maximum power of one track
*
* @param reader reference to a SampleReader to read from
* @param average reference to smoothing information
* @param window_size length of the sliding window for volume detection
*/
void getMaxPowerOfTrack(Kwave::SampleReader *reader,
Kwave::NormalizePlugin::Average *average,
unsigned int window_size);
};
}
#endif /* NORMALIZE_PLUGIN_H */
//***************************************************************************
//***************************************************************************
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