added waveform

3 files changed, 230 insertions, 7 deletions

diff --git a/noncore/multimedia/opierec/qtrec.cpp b/noncore/multimedia/opierec/qtrec.cpp
index 2bf795f..1e36c96 100644
--- a/noncore/multimedia/opierec/qtrec.cpp
+++ b/noncore/multimedia/opierec/qtrec.cpp
@@ -1,488 +1,488 @@
 /****************************************************************************
  // qtrec.cpp
  Created: Thu Jan 17 11:19:58 2002
  copyright 2002 by L.J. Potter <ljp@llornkcor.com>
 ****************************************************************************/
 
 #define DEV_VERSION
 
 #include "pixmaps.h"
 #include "qtrec.h"
 
 #include <pthread.h>
 
 extern "C" {
 #include "adpcm.h"
 }
 
 #include <sys/soundcard.h>
 
 // #if defined (QTOPIA_INTERNAL_FSLP)
 // #include <qpe/lnkproperties.h>
 // #endif
 
 #include <qpe/config.h>
 #include <qpe/qcopenvelope_qws.h>
 #include <qpe/qpeapplication.h>
 #include <qpe/resource.h>
 #include <qpe/storage.h>
 
 #include <qcheckbox.h>
 #include <qcombobox.h>
 //#include <qdatetime.h>
 #include <qdir.h>
 #include <qgroupbox.h>
 #include <qlabel.h>
 #include <qlayout.h>
 #include <qlistview.h>
 #include <qmessagebox.h>
 #include <qpopupmenu.h>
 #include <qpushbutton.h>
 #include <qslider.h>
 #include <qtabwidget.h>
 #include <qtimer.h>
 
 #include <errno.h>
 #include <fcntl.h>
 #include <math.h>
 #include <mntent.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
 #include <sys/soundcard.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/vfs.h>
 #include <unistd.h>
 #include<sys/wait.h>
 #include <sys/signal.h>
 
 //#define ZAURUS 0
 struct adpcm_state encoder_state;
 struct adpcm_state decoder_state;
 
 long findPeak(long input );
 //char deviceRates[];
 
 typedef struct {
    int sampleRate;
    /*      int fragSize; */
    /*      int blockSize; */
    int resolution; //bitrate
    int channels; //number of channels
    int fd; //file descriptor
    int sd; //sound device descriptor
    int numberSamples; //total number of samples
    int SecondsToRecord; // number of seconds that should be recorded
    float numberOfRecordedSeconds; //total number of samples recorded
    int samplesToRecord; //number of samples to be recorded
    int inVol; //input volume
    int outVol; //output volume
    int format; //wavfile format PCM.. ADPCM
    const  char *fileName; //name of fiel to be played/recorded
 } fileParameters;
 
 fileParameters filePara;
 
 bool monitoring, recording;
 bool stopped;
 QLabel *timeLabel;
 QSlider *timeSlider;
 int sd;
 
-#if defined(QT_QWS_EBX)
-#define DSPSTROUT "/dev/dsp"
-#define DSPSTRIN "/dev/dsp1"
-#define DSPSTRMIXEROUT "/dev/mixer"
-#define DSPSTRMIXERIN "/dev/mixer1"
-#else
+// #if defined(QT_QWS_EBX)
+// #define DSPSTROUT "/dev/dsp"
+// #define DSPSTRIN "/dev/dsp1"
+// #define DSPSTRMIXEROUT "/dev/mixer"
+// #define DSPSTRMIXERIN "/dev/mixer1"
+// #else
 #define DSPSTROUT "/dev/dsp"
 #define DSPSTRIN "/dev/dsp"
 #define DSPSTRMIXERIN "/dev/mixer"
 #define DSPSTRMIXEROUT "/dev/mixer"
-#endif
+//#endif
 
 // threaded recording
 void quickRec() {
 //void QtRec::quickRec() {
 
    int total = 0;  // Total number of bytes read in so far.
    int bytesWritten, number;
 
    count_info info;
 
    bytesWritten=0;
    number=0;
    QString num, timeString;
    int level=0;
    int threshold=0;
    //     if(limit != 0)
    //        t->start( ( limit +.3) , true);
 
    recording = true;
    //rate=filePara.sampleRate;
    //   int bits = filePara.resolution;
    audio_buf_info inInfo;
    ioctl( filePara.fd, SNDCTL_DSP_GETISPACE, &inInfo);
    //   qDebug("ispace is frags %d, total %d", inInfo.fragments, inInfo.fragstotal);
 
    if( filePara.resolution == 16 ) { //AFMT_S16_LE)
       level=7;
       threshold=0;
       timeString.sprintf("%.2f",  filePara.numberOfRecordedSeconds);
       timeLabel->setText( timeString+ " seconds");
 
       if( filePara.format==WAVE_FORMAT_DVI_ADPCM) {
          //         qDebug("start recording WAVE_FORMAT_DVI_ADPCM");
          char abuf[BUFSIZE/2];
          short sbuf[BUFSIZE];
          short sbuf2[BUFSIZE];
          memset( abuf,0,BUFSIZE/2);
          memset( sbuf,0,BUFSIZE);
          memset( sbuf2,0,BUFSIZE);
 
          for(;;) {
             if (stopped) {
                break;  // stop if playing was set to false
             }
 
             number=::read( filePara.sd, sbuf, BUFSIZE);
             if(number <= 0) {
                perror("recording error ");
                //               qDebug( "%s %d", filePara.fileName, number);
                //          errorStop();
                recording=stopped=false;
 //                     QMessageBox::message("Note", "Error recording to file\n%s",filePara.fileName);
                return;
             }
             //if(stereo == 2) {
 //        adpcm_coder( sbuf2, abuf, number/2, &encoder_state);
             adpcm_coder( sbuf, abuf, number/2, &encoder_state);
             bytesWritten = ::write( filePara.fd , abuf, number/4);
             long peak;
             for (int i = 0; i < number; i++)
             { //since Z is mono do normally
                peak = findPeak((long)sbuf[i]);
                printf("peak %ld\r",peak);
                fflush(stdout);
             }
             //------------->>>> out to file
             //           if(filePara.channels==1)
             //               total += bytesWritten/2; //mono
             //           else
             total += bytesWritten;
             filePara.numberSamples = total;
 //               if( total >= filePara.samplesToRecord)
 //                   timeSlider->setValue(0);
 //               else if( filePara.SecondsToRecord !=0)
             timeSlider->setValue( total);
 
             filePara.numberOfRecordedSeconds = (float)total / (float)filePara.sampleRate * (float)2;
             ioctl( filePara.sd, SNDCTL_DSP_GETIPTR, &info);
             timeString.sprintf("%.2f", filePara.numberOfRecordedSeconds);
             timeLabel->setText( timeString + " seconds");
 
             qApp->processEvents();
             if( total >= filePara.samplesToRecord)
                break;
          }
       } else {
          //         qDebug("start recording WAVE_FORMAT_PCM");
          short inbuffer[BUFSIZE], outbuffer[BUFSIZE];
          memset( inbuffer,0,BUFSIZE);
          memset( outbuffer,0,BUFSIZE);
          for(;;) {
             if (stopped) {
                break;  // stop if playing was set to false
             }
 
             number=::read( filePara.sd, inbuffer, BUFSIZE);
             if(number <= 0) {
                perror("recording error ");
                recording=stopped=false;
                //          errorStop();
                return;// false;
             }
 /*                for (int i=0;i< number;i++) { //2*i is left channel
 outbuffer[i]=inbuffer[i]>>1; // no clippy, please
 }*/
             bytesWritten = ::write( filePara.fd , inbuffer, number);
 //------------->>>> out to file
             if(bytesWritten < 0) {
                //            errorStop();
                perror("File writing error ");
                return;// false;
             }
 
             //          if(filePara.channels==1)
             //              total += bytesWritten/2; //mono
             //          else
             total += bytesWritten;
             long peak;
             for (int i = 0; i < number; i++)
             { //since Z is mono do normally
                peak = findPeak((long)inbuffer[i]);
                printf("peak %ld\r",peak);
                fflush(stdout);
             }
             filePara.numberSamples = total;
             if(filePara.SecondsToRecord !=0)
                timeSlider->setValue( total);
 //         printf("Writing number %d, bytes %d,total %d\r",number,  bytesWritten , total);
 //         fflush(stdout);
 
             ioctl( filePara.sd, SNDCTL_DSP_GETIPTR, &info);
 //            qDebug("%d, %d", info.bytes, ( info.bytes / filePara.sampleRate) / 2);
 
             filePara.numberOfRecordedSeconds = (float)total / (float)filePara.sampleRate / (float)2;
             timeString.sprintf("%.2f", filePara.numberOfRecordedSeconds);
             timeLabel->setText( timeString + " seconds");
             qApp->processEvents();
             if( total >= filePara.samplesToRecord)
                break;
          }
       } //end main loop
 
    } else { // <<<<<<<<<<<<<<<<<<<<<<<   format = AFMT_U8;
       unsigned char unsigned_inbuffer[BUFSIZE], unsigned_outbuffer[BUFSIZE];
       memset( unsigned_inbuffer, 0, BUFSIZE);
       memset( unsigned_outbuffer, 0, BUFSIZE);
 
       for(;;) {
          if (stopped) {
             //            qDebug("quickRec:: stopped");
             break;  // stop if playing was set to false
          }
          number=::read( filePara.sd, unsigned_inbuffer, BUFSIZE);
 //-------------<<<< in from device
 //  val = (data ^ 0x80) << 8;
 
 //unsigned_outbuffer = (unsigned_inbuffer ^ 0x80) << 8;
 
 //       if(number <= 0) {
 //         perror("recording error ");
 //         qDebug(filePara.fileName);
 //         //        errorStop();
 //         QMessageBox::message("Note","error recording");
 //         return;// false;
 //       }
 //          for (int i=0;i< number;i++) { //2*i is left channel
 //              unsigned_outbuffer[i]=unsigned_inbuffer[i]>>1; // no clippy, please
 //          }
 
          bytesWritten = ::write( filePara.fd , unsigned_inbuffer, number);
 
 //------------->>>> out to file
          if(bytesWritten < 0) {
             recording=stopped=false;
             //          errorStop();
             QMessageBox::message("Note","There was a problem\nwriting to the file");
             perror("File writing error ");
             return;// false;
          }
          total += bytesWritten;
          filePara.numberSamples = total;
          //             printf("\nWriting number %d, bytes %d,total %d \r",number,  bytesWritten , total);
          //             fflush(stdout);
          if(filePara.SecondsToRecord !=0)
             timeSlider->setValue( total);
 
          filePara.numberOfRecordedSeconds = (float)total / (float)filePara.sampleRate;
 
          timeString.sprintf("%.2f",filePara.numberOfRecordedSeconds);
          timeLabel->setText( timeString + " seconds");
 
          qApp->processEvents();
          if( total >= filePara.samplesToRecord)
             break;
       } //end main loop
    }
 //       qDebug("Final %d, %d", filePara.samplesToRecord , filePara.numberOfRecordedSeconds);
 } /// END quickRec()
 
 // threaded play
 void playIt() {
 
 }
 
 /////////////////<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>
 QtRec::QtRec( QWidget* parent,  const char* name, WFlags fl )
    : QWidget( parent, name, fl ) {
    //    QCopEnvelope( "QPE/System", "volumeChange(bool)" ) << true;  // mute device
    //  autoMute=TRUE;
 //     QPEApplication::grabKeyboard();
 
    if ( !name )
       setName( "OpieRec" );
    init();
    initConfig();
    initConnections();
    renameBox = 0;
 
 // open sound device to get volumes
    soundDevice = new Device( this, DSPSTROUT, DSPSTRMIXEROUT, false);
 
 //     soundDevice->setDeviceFormat(AFMT_S16_LE);
 //     soundDevice->setDeviceChannels(1);
 //     soundDevice->setDeviceRate( 22050);
 
    getInVol();
    getOutVol();
 
    soundDevice->closeDevice(  true);
    soundDevice->sd=-1;
    soundDevice=0;
    wavFile=0;
 
    if(soundDevice) delete soundDevice;
 
    initIconView();
 
    if(autoMute)
       doMute(true);
    ListView1->setFocus();
    playing=false;
 }
 
 QtRec::~QtRec() {
 
 }
 
 void QtRec::cleanUp() {
 
    if(!stopped) {
       stopped=true;
       endRecording();
    }
 
    ListView1->clear();
 
    if(autoMute)
       doMute(false);
 
    if(wavFile) delete wavFile;
 // if(soundDevice) delete soundDevice;
 //     QPEApplication::grabKeyboard();
 //     QPEApplication::ungrabKeyboard();
 }
 
 void QtRec::init() {
 
    needsStereoOut=false;
    QPixmap image3( ( const char** ) image3_data );
    QPixmap image4( ( const char** ) image4_data );
    QPixmap image6( ( const char** ) image6_data );
 
    stopped=true;
    setCaption( tr( "OpieRecord " ) + QString::number(VERSION) );
    QGridLayout *layout = new QGridLayout( this );
    layout->setSpacing( 2);
    layout->setMargin( 2);
 
    TabWidget = new QTabWidget( this, "TabWidget" );
    layout->addMultiCellWidget(TabWidget, 0, 7, 0, 7);
    //    TabWidget->setTabShape(QTabWidget::Triangular);
 
    ///**********<<<<<<<<<<<<>>>>>>>>>>>>***************
    tab = new QWidget( TabWidget, "tab" );
 
    QGridLayout *layout1 = new QGridLayout( tab);
    layout1->setSpacing( 2);
    layout1->setMargin( 2);
 
    timeSlider = new QSlider( 0,100,10,0, QSlider::Horizontal, tab, (const char *) "timeSlider" );
    //    timeSlider->setFixedWidth(150);
    layout1->addMultiCellWidget( timeSlider, 1, 1, 0, 3);
 //    timeSlider->setTickmarks(QSlider::Above);
 
    timeLabel = new QLabel( tab, "TimeLabel" );
    layout1->addMultiCellWidget( timeLabel, 0, 0, 0, 3);
 
    playLabel2 = new QLabel(tab, "PlayLabel2" );
    playLabel2->setText(tr("Play") );
    playLabel2->setFixedHeight(18);
    layout1->addMultiCellWidget( playLabel2, 0, 0, 4, 4);
 
    Stop_PushButton = new QPushButton(  tab, "Stop_PushButton" );
    layout1->addMultiCellWidget( Stop_PushButton, 1, 1, 4, 4);
    Stop_PushButton->setFixedSize(22,22);
    Stop_PushButton->setPixmap( image4 );
 
    toBeginningButton = new QPushButton(  tab, "Beginning_PushButton" );
    layout1->addMultiCellWidget(toBeginningButton, 1, 1, 5, 5);
    toBeginningButton->setFixedSize(22,22);
    toBeginningButton->setPixmap( Resource::loadPixmap("fastback") );
 
    toEndButton = new QPushButton(  tab, "End_PushButton" );
    layout1->addMultiCellWidget( toEndButton, 1, 1, 6, 6);
    toEndButton->setFixedSize(22,22);
    toEndButton->setPixmap(  Resource::loadPixmap( "fastforward" )  );
 
    QLabel *recLabel2;
    recLabel2 = new QLabel( tab, "recLabel2" );
    recLabel2->setText(tr("Rec"));
    recLabel2->setFixedHeight(18);
    layout1->addMultiCellWidget( recLabel2, 0, 0, 7, 7);
 
    Rec_PushButton = new QPushButton( tab, "Rec_PushButton" );
    layout1->addMultiCellWidget(  Rec_PushButton, 1, 1, 7, 7);
    Rec_PushButton->setFixedSize(22,22);
    Rec_PushButton->setPixmap( image6 );
 
    t = new QTimer( this );
    connect( t, SIGNAL( timeout() ), SLOT( timerBreak() ) );
 
    rewindTimer = new QTimer( this );
    connect( rewindTimer, SIGNAL( timeout() ), SLOT( rewindTimerTimeout() ) );
 
    forwardTimer = new QTimer( this );
    connect( forwardTimer, SIGNAL( timeout() ), SLOT( forwardTimerTimeout() ) );
 
    deleteSoundButton  = new QPushButton( tab, "deleteSoundButton" );
    layout1->addMultiCellWidget( deleteSoundButton, 1, 1, 8, 8);
    deleteSoundButton->setText( tr( "Delete" ) );
 
    ListView1 = new QListView( tab, "IconView1" );
    layout1->addMultiCellWidget( ListView1, 2, 2, 0, 8);
 
    ListView1->addColumn( tr( "Name" ) );
    ListView1->setColumnWidth(0,140);
    ListView1->setSorting( 1, false);
    ListView1->addColumn( tr( "Time" ) ); //in seconds
    ListView1->setColumnWidth(1,50);
    ListView1->addColumn( tr("Location") );
    ListView1->setColumnWidth(2,50);
    ListView1->addColumn( tr("Date") );
    ListView1->setColumnWidth(3,63);
 
    ListView1->setColumnWidthMode(0,QListView::Manual);
    ListView1->setColumnAlignment(1,QListView::AlignCenter);
    ListView1->setColumnAlignment(2,QListView::AlignRight);
    ListView1->setColumnAlignment(3,QListView::AlignLeft);
    ListView1->setAllColumnsShowFocus( true );
    QPEApplication::setStylusOperation( ListView1->viewport(),QPEApplication::RightOnHold);
 
    TabWidget->insertTab( tab, tr( "Files" ) );
 
    ///**********<<<<<<<<<<<<>>>>>>>>>>>>***************
    tab_3 = new QWidget( TabWidget, "tab_3" );
    ////////////////////////////////////
 
    Layout19 = new QHBoxLayout( tab_3);
    Layout19->setSpacing( 2 );
    Layout19->setMargin( 0 );
 
    Layout18 = new QVBoxLayout(this);
    Layout18->setSpacing( 2 );
    Layout18->setMargin( 0 );
 
    Layout17 = new QHBoxLayout(this);
    Layout17->setSpacing( 2 );
    Layout17->setMargin( 0 );
 
    sampleGroup = new QGroupBox( tab_3, "samplegroup" );
    sampleGroup->setTitle( tr( "Sample Rate" ) );
    sampleGroup->setFixedSize( 95,50);
 
    sampleRateComboBox = new QComboBox( false, sampleGroup, "SampleRateComboBox" );
diff --git a/noncore/multimedia/opierec/waveform.cpp b/noncore/multimedia/opierec/waveform.cpp
new file mode 100644
index 0000000..05be373
--- a/dev/null
+++ b/noncore/multimedia/opierec/waveform.cpp
@@ -0,0 +1,160 @@
+/**********************************************************************
+ ** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
+ **
+ ** This file is part of the Qtopia Environment.
+ **
+ ** This file may be distributed and/or modified under the terms of the
+ ** GNU General Public License version 2 as published by the Free Software
+ ** Foundation and appearing in the file LICENSE.GPL included in the
+ ** packaging of this file.
+ **
+ ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ **
+ ** See http://www.trolltech.com/gpl/ for GPL licensing information.
+ **
+ ** Contact info@trolltech.com if any conditions of this licensing are
+ ** not clear to you.
+ **
+ **********************************************************************/
+#include "waveform.h"
+
+#include <qlabel.h>
+#include <qpainter.h>
+
+
+Waveform::Waveform( QWidget *parent, const char *name, WFlags fl )
+   : QWidget( parent, name, fl )
+{
+   pixmap = 0;
+   windowSize = 100;
+   samplesPerPixel = 8000 / (5 * windowSize);
+   currentValue = 0;
+   numSamples = 0;
+   windowPosn = 0;
+   window = 0;
+}
+
+
+void Waveform::changeSettings( int frequency, int channels )
+{
+   makePixmap();
+//   qWarning("change waveform %d, %d", frequency, channels);
+   samplesPerPixel = frequency * channels / (5 * windowSize);
+   qWarning("Waveform::changeSettings %d", samplesPerPixel);
+   if ( !samplesPerPixel )
+      samplesPerPixel = 1;
+   currentValue = 0;
+   numSamples = 0;
+   windowPosn = 0;
+   draw();
+}
+
+
+Waveform::~Waveform()
+{
+   if ( window )
+      delete[] window;
+   if ( pixmap )
+      delete pixmap;
+}
+
+
+void Waveform::reset()
+{
+   makePixmap();
+   currentValue = 0;
+   numSamples = 0;
+   windowPosn = 0;
+   draw();
+}
+
+
+void Waveform::newSamples( const short *buf, int len )
+{
+   // Cache the object values in local variables.
+   int samplesPerPixel = this->samplesPerPixel;
+   int currentValue = this->currentValue;
+   int numSamples = this->numSamples;
+   short *window = this->window;
+   int windowPosn = this->windowPosn;
+   int windowSize = this->windowSize;
+
+   // Average the incoming samples to scale them to the window.
+   while ( len > 0 ) {
+      currentValue += *buf++;
+      --len;
+      if ( ++numSamples >= samplesPerPixel ) {
+         window[windowPosn++] = (short)(currentValue / numSamples);
+         if ( windowPosn >= windowSize ) {
+            this->windowPosn = windowPosn;
+            draw();
+            windowPosn = 0;
+         }
+         numSamples = 0;
+         currentValue = 0;
+      }
+   }
+
+   // Copy the final state back to the object.
+//qWarning("%d, %d, %d", currentValue, numSamples, windowPosn);
+ this->currentValue = currentValue;
+   this->numSamples = numSamples;
+   this->windowPosn = windowPosn;
+}
+
+
+void Waveform::makePixmap()
+{
+   if ( !pixmap ) {
+      pixmap = new QPixmap( size() );
+      windowSize = pixmap->width();
+      window = new short [windowSize];
+   }
+}
+
+
+void Waveform::draw()
+{
+   pixmap->fill( Qt::black );
+   QPainter painter;
+   painter.begin( pixmap );
+   painter.setPen( Qt::green );
+
+   int middle = pixmap->height() / 2;
+   int mag;
+   short *window = this->window;
+   int posn;
+   int size = windowPosn;
+   for( posn = 0; posn < size; ++posn )
+   {
+      mag = (window[posn] * middle / 32768);
+      painter.drawLine(posn, middle - mag, posn, middle + mag);
+   }
+   if ( windowPosn < windowSize )
+   {
+      painter.drawLine(windowPosn, middle, windowSize, middle);
+   }
+
+   painter.end();
+
+   paintEvent( 0 );
+}
+
+
+void Waveform::paintEvent( QPaintEvent * )
+{
+   QPainter painter;
+   painter.begin( this );
+
+   if ( pixmap ) {
+      painter.drawPixmap( 0, 0, *pixmap );
+   } else {
+      painter.setPen( Qt::green );
+      QSize sz = size();
+      painter.drawLine(0, sz.height() / 2, sz.width(), sz.height() / 2);
+   }
+
+   painter.end();
+}
+
diff --git a/noncore/multimedia/opierec/waveform.h b/noncore/multimedia/opierec/waveform.h
new file mode 100644
index 0000000..b9a4c70
--- a/dev/null
+++ b/noncore/multimedia/opierec/waveform.h
@@ -0,0 +1,63 @@
+/**********************************************************************
+** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
+**
+** This file is part of the Qtopia Environment.
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** See http://www.trolltech.com/gpl/ for GPL licensing information.
+**
+** Contact info@trolltech.com if any conditions of this licensing are
+** not clear to you.
+**
+**********************************************************************/
+#ifndef WAVEFORM_H
+#define WAVEFORM_H
+
+#include <qwidget.h>
+#include <qpixmap.h>
+
+
+class QLabel;
+
+
+class Waveform : public QWidget
+{
+public:
+    Waveform( QWidget *parent=0, const char *name=0, WFlags fl=0 );
+    ~Waveform();
+
+public:
+    void changeSettings( int frequency, int channels );
+    void reset();
+    void newSamples( const short *buf, int len );
+
+private:
+
+    void makePixmap();
+    void draw();
+
+protected:
+
+    void paintEvent( QPaintEvent *event );
+
+private:
+    int samplesPerPixel;
+    int currentValue;
+    int numSamples;
+    short *window;
+    int windowPosn;
+    int windowSize;
+    QPixmap *pixmap;
+
+};
+
+
+#endif
+