1 files changed, 160 insertions, 0 deletions

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();
+}
+