IQ recording file playback partial checkin.

NOTE: only the gui components and settings handling have been implemented.  Actual recording playback is not yet implemented.

Partial checkin of initial P25 decoder development.  

NOTE: P25 decoder is not yet functional.

src/instrument/tap/stream/BinaryTapViewPanel.java

@@ -0,0 +1,155 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     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 3 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, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+package instrument.tap.stream;
+
+import instrument.gui.SampleModel;
+import instrument.tap.Tap;
+import instrument.tap.TapViewPanel;
+
+import java.awt.Color;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import java.util.List;
+import java.util.Observable;
+
+public class BinaryTapViewPanel extends TapViewPanel
+{
+	private Tap mTap;
+	private List<Boolean> mSamples;
+	private int mSampleCount;
+	private int mOffset = 0;
+
+	public BinaryTapViewPanel( BinaryTap tap )
+	{
+		super( new SampleModel<Boolean>(), tap.getName() );
+		
+		mTap = tap;
+		mTap.addListener( getModel() );
+		
+		getModel().setSampleCount( 
+			(int)( getModel().getSampleCount() * tap.getSampleRateRatio() ) );
+		
+		getModel().setDelay( tap.getDelay() );
+	}
+	
+	@Override
+    public void update( Observable arg0, Object arg1 )
+    {
+		mSamples = (List<Boolean>)getModel().getSamples();
+		mSampleCount = getModel().getSampleCount();
+		repaint();
+    }
+	
+	public void paintComponent( Graphics g )
+	{
+		super.paintComponent( g );
+		
+		Graphics2D g2 = (Graphics2D)g;
+
+		int height = getHeight();
+		int width = getWidth();
+		
+		g2.setColor( Color.DARK_GRAY );
+		
+		float middle = (float)height / 2.0f;
+
+		g2.drawLine( 0, (int)middle, width, (int)middle );
+
+		if( mSamples != null && mSamples.size() > 0 )
+		{
+			g2.setColor( getForeground() );
+			
+			g2.drawString( mLabel, 5 , 15 );
+
+			for( int x = 1; x < mSamples.size(); x++ )
+			{
+				paintBit( g, x, mSamples.get( x ) );
+			}
+		}
+		
+		g2.dispose();
+	}
+	
+	/**
+	 * Paints a polyline representing a boolean value with a 0 or 1 label in 
+	 * the middle of it
+	 * 
+	 * @param graphics
+	 * @param index - index of the sample int the sample buffer
+	 * @param value - bit value, 0 or 1
+	 */
+	private void paintBit( Graphics graphics, int index, boolean value )
+	{
+		Graphics2D g2 = (Graphics2D)graphics;
+
+		Path2D.Float polyline = 
+		        new Path2D.Float( Path2D.Float.WIND_EVEN_ODD, mSamples.size() );
+		
+		float middleY = ( (float)getHeight() / 2.0f );
+
+		float indexWidth = (float)( getWidth() ) / (float)mSampleCount;
+		
+		float startX = (float)index * indexWidth;
+		float stopX = (float)(index + 1 ) * indexWidth;
+		float fivePercent = indexWidth * .05f;
+		float leftX = startX + fivePercent;
+		float rightX = stopX - fivePercent;
+
+		/* Start */
+		polyline.moveTo( startX, middleY );
+
+		/* Left horizonal segment */
+		polyline.lineTo( leftX, middleY );
+
+		float y = ( value ? ( middleY - ( middleY * 0.5f) ) : 
+							( middleY + ( middleY * 0.5f) ) );
+
+		/* Left vertical segment */
+		polyline.lineTo( leftX, y );
+		
+		/* Middle horizontal segment */
+		polyline.lineTo( rightX, y );
+
+		/* Right vertical segment */
+		polyline.lineTo( rightX, middleY );
+
+		/* Right horizontal segment */
+		polyline.lineTo( stopX, middleY );
+
+		g2.draw( polyline );
+		
+		/* Draw the bit value label */
+		String bit = value ? "1" : "0";
+
+        FontMetrics fontMetrics = graphics.getFontMetrics( this.getFont() );
+        
+        Rectangle2D label = fontMetrics.getStringBounds( bit, graphics );
+        
+        float offsetX = (float)label.getWidth() / 2.0f;
+        float offsetY = (float)label.getWidth() / 2.0f;
+
+        float middleX = startX + ( indexWidth / 2.0f );
+        
+        graphics.drawString( bit, 
+        					 (int)( middleX - offsetX ), 
+        					 (int)( middleY - offsetY ) );
+	}
+}