HackRF - partial check-in of code. HackRF is commented out in the TunerManager, since it's not yet ready for use.

src/source/tuner/rtl/ByteSampleAdapter.java

@@ -0,0 +1,56 @@
+/*******************************************************************************
+ *     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 source.tuner.rtl;
+
+import source.mixer.SampleAdapter;
+
+public class ByteSampleAdapter extends SampleAdapter
+{
+	private final static float[] LOOKUP_VALUES;
+
+	/**
+	 * Creates a static lookup table that converts the 8-bit valued range 
+	 * from 0 - 255 into scaled float values of -32768.0 to 0 to 32512.0
+	 */
+	static
+	{
+		LOOKUP_VALUES = new float[ 256 ];
+		
+		for( int x = 0; x < 256; x++ )
+		{
+			LOOKUP_VALUES[ x ] = (float)( x - 128 ) * 256.0f;
+		}
+		
+		LOOKUP_VALUES[ 128 ] = 0.0000001f;
+	}
+
+	@Override
+    public Float[] convert( byte[] samples )
+    {
+		Float[] convertedSamples = new Float[ samples.length ];
+		int pointer = 0;
+		
+		for( byte sample: samples )
+		{
+			/* Convert byte value into float from the lookup table */
+			convertedSamples[ pointer++ ] = LOOKUP_VALUES[ ( sample & 0xFF ) ];
+		}
+		
+	    return convertedSamples;
+    }
+}