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/***************************************************************************
WindowFunction.h - Windows functions for signal processing
-------------------
begin : Feb 05 2001
copyright : (C) 2001 by Thomas Eschenbacher
email : Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
***************************************************************************/
/***************************************************************************
* *
* 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 WINDOW_FUNCTION_H
#define WINDOW_FUNCTION_H
#include "config.h"
#include "libkwave_export.h"
#include <QtGlobal>
#include <QVector>
#include "libkwave/TypesMap.h"
class QString;
namespace Kwave
{
/** enumeration of window functions */
typedef enum {
WINDOW_FUNC_NONE = 0,
WINDOW_FUNC_HAMMING = 1,
WINDOW_FUNC_HANNING = 2,
WINDOW_FUNC_BLACKMAN = 3,
WINDOW_FUNC_TRIANGULAR = 4
} window_function_t;
/**
* @class WindowFunction
* Handles window functions for signal processing. Also holds a static
* map of known window functions.
*/
class LIBKWAVE_EXPORT WindowFunction
{
public:
/**
* Constructor
* @param type initial window function type.
*/
explicit WindowFunction(window_function_t type);
/** Destructor */
virtual ~WindowFunction();
/**
* Returns the coefficients of a window function with
* the given number of points. This is similar to Kwave's
* Interpolation class.
*/
QVector<double> points(unsigned int len) const;
/**
* Returns the window function id through it's numeric index. If
* the index is out of range, the return value will be
* "WINDOW_FUNC_NONE".
* @param index numeric index to be searched [0...count-1]
*/
static window_function_t findFromIndex(unsigned int index) {
return m_types_map.findFromData(index);
}
/**
* Returns the window function id through it's name. If
* the name is unknown the return value will be "WINDOW_FUNC_NONE".
* @param name the name to be searched
*/
static window_function_t findFromName(const QString &name) {
return m_types_map.findFromName(name);
}
/**
* Returns the numeric index of a window function [0...count-1].
* @param type the type of the window function
*/
static unsigned int index(window_function_t type)
{
return m_types_map.data(type);
}
/**
* Returns the name of a window function.
* @param type the type of the window function
*/
static const QString name(window_function_t type)
{
return m_types_map.name(type);
}
/**
* Returns the description of a window function.
* @param type the type of the window function
* @param localized if true, the localized description will be
* returned instead of the non-localized one
*/
static QString description(window_function_t type,
bool localized)
{
return m_types_map.description(type, localized);
}
/** returns the number of available window functions */
static unsigned int count() {
return m_types_map.count();
}
/**
* This map will be initialized with all known window functions.
*/
class InitializedTypesMap:
public Kwave::TypesMap<window_function_t,unsigned int>
{
public:
/** Constructor */
explicit InitializedTypesMap()
:Kwave::TypesMap<window_function_t, unsigned int>()
{
fill();
}
/** fill function for the map */
void fill() override;
};
private:
/** id of the window function */
window_function_t m_type;
/** Static map of window function types. */
static InitializedTypesMap m_types_map;
};
//***********************************************************************
static inline window_function_t &operator++(window_function_t &f)
{
return (f = (f == WINDOW_FUNC_TRIANGULAR) ?
WINDOW_FUNC_NONE : window_function_t(f+1) );
}
}
#endif /* WINDOW_FUNCTION_H */
//***************************************************************************
//***************************************************************************
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