/* * level.cpp. Part of krecord by Gerd Knorr. * * Displays the input level. * * Copyright (C) 1998 Florian Kolbe * * History: * * Jun 04 1998 Florian Kolbe *    Created * */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <math.h>#include <limits.h>#include <sys/types.h>#include <qwidget.h>#include <qpixmap.h>#include <qpainter.h>#include <qcolor.h>#include <qtimer.h>#include "sound.h"#include "level.moc"#ifndef min#define min(a,b) ((a) < (b) ? (a) : (b))#endif#ifndef max#define max(a,b) ((a) > (b) ? (a) : (b))#endif/* ---------------------------------------------------------------------- */LevelWindow::LevelWindow(QWidget *parent, char *name):QWidget(parent,name,0){    /* which type of vu-meter ? */    PowervsMax=1;    LogvsLinear=1;        /*      did not get sound-params yet.    */    init  = FALSE;    sdata = NULL;        /*      no peaks initially.    */    peak[0] = 0;    peak[1] = 0;        clipLeft=false;    clipRight=false;        /*      will use output buffer, so no background necessary.    */    setBackgroundMode(NoBackground);    orange = QColor("orangered");        /*      Initialize output buffer.    */       buffer = new QPixmap(size());        /*      Initialize timers to reset peaks.    */    timer[0] = new QTimer();    timer[1] = new QTimer();    connect(timer[0], SIGNAL(timeout()), this, SLOT(resetPeakLeft()));    connect(timer[1], SIGNAL(timeout()), this, SLOT(resetPeakRight()));    } /* LevelWindow */LevelWindow::~LevelWindow(void){        delete buffer;    delete timer[0];    delete timer[1];}void LevelWindow::resizeEvent(QResizeEvent*){    /*      Fix size of output buffer.    */    delete buffer;    buffer = new QPixmap(size());   }void LevelWindow::resetPeakLeft(void){    peak[0] = 0;    clipLeft = false;    repaint();}void LevelWindow::resetPeakRight(void){    peak[1] = 0;    clipRight = false;    repaint();}void LevelWindow::drawBar(QPainter& painter, int channel, float level,			  int size, bool drawRed){    int xLevel = (int)(((float)width())*level); /* x-pos of current level */    int x80    = width()*80/100;    /* x-pos of 80% level     */    int y,x;        /*      Left/mono top, right bottom.    */    if (channel == 0) {	y = 0;    } else {	y = height()/2;    }        const QColor *colortodraw=&darkGreen;    if (drawRed) {	colortodraw=&red;    }        /*      Green: 0%-[level|80%]    */    painter.fillRect(0, y+1, max(1, min(xLevel, x80)), size-2, *colortodraw);        /*      Yellow part.    */    if (!drawRed) {	colortodraw=&darkYellow;    }        if (level > 0.8) {	painter.fillRect(x80, y+1, max(1, xLevel-x80), size-2, *colortodraw);    }        /*      Current peak is either reached again or pushed.    */    if (level >= peak[channel]) {	peak[channel] = level;	timer[channel]->start(1000, TRUE);    }        /*      Draw peak if greater than current level.    */    if (peak[channel] >= level) {		/*          0- 80: green	  80- 98: yellow	  99-100: orange	*/	painter.setPen(green);	if (peak[channel] > 0.80) {	    painter.setPen(yellow);	}	if (peak[channel] >= 0.99) {	    painter.setPen(orange);	}	x = (int)min(width()*peak[channel]-1,width()-1);	painter.drawLine(x, y+1, x, y+size-2);    }} /* drawBar */void LevelWindow::paintEvent(QPaintEvent*){   int      maxLeft  = 0;   int      maxRight = 0;   int      i;   QPainter painter;   int      maxAmp;   int64_t powerLeft=0;   int64_t powerRight=0;   float    floatPowerLeft=0;   float    floatPowerRight=0;   char     buf[32];#ifndef NO_COMPENSATE_BIAS   int64_t bLeft=0;   int64_t bRight=0;#endif   if ((init == FALSE) || !sdata) return;      /* if true then calculate Power else calculate Max */   if (PowervsMax) {     /*       Calculate power of the signal depending on format.       Since the signal may not have an average value of 0 precisely,       we shouldn't simply calculate:       sum_for_all_samples (pulse_value