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/*
Copyright (C) 2000 Hans Meine
<hans_meine@gmx.net>
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.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef ARTS_TOOLS_LEVELMETERS_H
#define ARTS_TOOLS_LEVELMETERS_H
#include <qobject.h>
#include <qframe.h>
#include <qdatetime.h>
#include <qptrlist.h>
#include <math.h>
// helper functions
const float LEVEL_MIN= 1.f/(1<<20); // minimal positive sample for 20 bit resolution
inline float levelToDB(float level) {
if (level<LEVEL_MIN) level=LEVEL_MIN; // prevent from div by 0
return (6.f/log(2.f))*log(level);
}
inline float DBToLevel(float db) {
return exp(db/(log(2.f)/6.f));
}
/**
* Base class for a single volume / value bar.
*/
class ACLevelMeter : public QFrame {
Q_OBJECT
public:
ACLevelMeter(QWidget *parent): QFrame(parent) {}
public slots:
virtual void setValue(float f) = 0;
};
/**
* Base class for a pair of volume / value bars.
*/
class StereoLevelMeter : public QFrame {
Q_OBJECT
public:
StereoLevelMeter(QWidget *parent): QFrame(parent) {}
public slots:
virtual void setValues(float left, float right) = 0;
};
/**
* Special LevelMeter which remembers min and max of the last [peakMillis]
* milliseconds and displays a full bar with optional max/min markers.
*/
class PeakBar : public ACLevelMeter {
Q_OBJECT
bool clipped;
protected:
static const int peakMillis; // how long do the peaks stay at their max?
class Observation {
public:
QTime time;
float value;
Observation(float aValue): value(aValue) { time.start(); }
};
QPtrList<Observation> lastValues;
float currentValue, maxValue, minValue;
void checkMinMax();
bool displayMinPeak;
bool horizontalMode;
void frameChanged();
public:
PeakBar(QWidget *parent);
QSize sizeHint() const;
void drawContents(QPainter *p);
virtual void setValue(float f);
};
/**
* Special class which draws the Db scale with ticks, numbers and so on.
*/
class ScaleView : public QFrame {
Q_OBJECT
protected:
QFont font;
int dbRange;
int upperMargin, lowerMargin;
public:
ScaleView(QWidget *parent);
void setDbRange(int db);
void setScaleMargins(int margins) { upperMargin= margins; lowerMargin=margins; }
QSize sizeHint() const;
void drawContents(QPainter *p);
};
/**
* Reusable class which displays two volume bars (left/right) with a Db scale
* and clip indicators. Supports / will have a context menu with some display
* options like Db range, whether minimal values are also shown and others.
*/
class PeakLevelMeters : public StereoLevelMeter {
Q_OBJECT
protected:
int dbRange;
PeakBar left, right;
ScaleView scaleView;
public:
PeakLevelMeters(QWidget *parent);
public slots:
void setValues(float leftVal, float rightVal);
void setDbRange(int db);
};
class KLed;
/**
* Simple LevelMeter implementation with 12 KLeds.
* Shows them in green/yellow/red combi if not blueState set, in which
* case it's all blue. (Original artscontrol widget by stw.)
*/
class LedMeter : public ACLevelMeter {
Q_OBJECT
protected:
KLed *leds[12];
public:
LedMeter(QWidget *parent, bool blueState = false);
void setValue(float f);
};
/**
* A simple pair of LedMeters.
*/
class StereoLedMeters : public StereoLevelMeter {
Q_OBJECT
protected:
LedMeter left, right;
public:
StereoLedMeters(QWidget *parent);
public slots:
void setValues(float left, float right);
};
#endif /* ARTS_TOOLS_LEVELMETERS_H */
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