/*******************************************************************************
* 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 sample.adapter;
public class ByteSampleAdapter implements ISampleAdapter
{
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 -1.0 to 0 to 1.0
*/
static
{
LOOKUP_VALUES = new float[ 256 ];
for( int x = 0; x < 256; x++ )
{
LOOKUP_VALUES[ x ] = (float)( x - 127 ) / 128.0f;
}
}
@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;
}
}