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Maven artifact for JLayer library. http://www.javazoom.net/javalayer/sources.html
/*
* 11/19/04 1.0 moved to LGPL.
*
* 29/05/01 Michael Scheerer, Fixed some C++ to Java porting bugs.
*
* 16/07/01 Michael Scheerer, Catched a bug in method
* read_sampledata, which causes an outOfIndexException.
*
* 12/12/99 Initial version. Adapted from javalayer.java
* and Subband*.java. [email protected]
*
* 02/28/99 Initial version : javalayer.java by E.B
*-----------------------------------------------------------------------
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------
*/
package javazoom.jl.decoder;
/**
* Implements decoding of MPEG Audio Layer II frames.
*/
class LayerIIDecoder extends LayerIDecoder implements FrameDecoder
{
public LayerIIDecoder()
{
}
protected void createSubbands()
{
int i;
if (mode == Header.SINGLE_CHANNEL)
for (i = 0; i < num_subbands; ++i)
subbands[i] = new SubbandLayer2(i);
else if (mode == Header.JOINT_STEREO)
{
for (i = 0; i < header.intensity_stereo_bound(); ++i)
subbands[i] = new SubbandLayer2Stereo(i);
for (; i < num_subbands; ++i)
subbands[i] = new SubbandLayer2IntensityStereo(i);
}
else
{
for (i = 0; i < num_subbands; ++i)
subbands[i] = new SubbandLayer2Stereo(i);
}
}
protected void readScaleFactorSelection()
{
for (int i = 0; i < num_subbands; ++i)
((SubbandLayer2)subbands[i]).read_scalefactor_selection(stream, crc);
}
/**
* Class for layer II subbands in single channel mode.
*/
static class SubbandLayer2 extends Subband
{
// this table contains 3 requantized samples for each legal codeword
// when grouped in 5 bits, i.e. 3 quantizationsteps per sample
public static final float grouping_5bits[] = new float[]
{
-2.0f/3.0f, -2.0f/3.0f, -2.0f/3.0f,
0.0f, -2.0f/3.0f, -2.0f/3.0f,
2.0f/3.0f, -2.0f/3.0f, -2.0f/3.0f,
-2.0f/3.0f, 0.0f, -2.0f/3.0f,
0.0f, 0.0f, -2.0f/3.0f,
2.0f/3.0f, 0.0f, -2.0f/3.0f,
-2.0f/3.0f, 2.0f/3.0f, -2.0f/3.0f,
0.0f, 2.0f/3.0f, -2.0f/3.0f,
2.0f/3.0f, 2.0f/3.0f, -2.0f/3.0f,
-2.0f/3.0f, -2.0f/3.0f, 0.0f,
0.0f, -2.0f/3.0f, 0.0f,
2.0f/3.0f, -2.0f/3.0f, 0.0f,
-2.0f/3.0f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f,
2.0f/3.0f, 0.0f, 0.0f,
-2.0f/3.0f, 2.0f/3.0f, 0.0f,
0.0f, 2.0f/3.0f, 0.0f,
2.0f/3.0f, 2.0f/3.0f, 0.0f,
-2.0f/3.0f, -2.0f/3.0f, 2.0f/3.0f,
0.0f, -2.0f/3.0f, 2.0f/3.0f,
2.0f/3.0f, -2.0f/3.0f, 2.0f/3.0f,
-2.0f/3.0f, 0.0f, 2.0f/3.0f,
0.0f, 0.0f, 2.0f/3.0f,
2.0f/3.0f, 0.0f, 2.0f/3.0f,
-2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f,
0.0f, 2.0f/3.0f, 2.0f/3.0f,
2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f
};
// this table contains 3 requantized samples for each legal codeword
// when grouped in 7 bits, i.e. 5 quantizationsteps per sample
public static final float grouping_7bits[] = new float[]
{
-0.8f, -0.8f, -0.8f, -0.4f, -0.8f, -0.8f, 0.0f, -0.8f, -0.8f, 0.4f, -0.8f, -0.8f, 0.8f, -0.8f, -0.8f,
-0.8f, -0.4f, -0.8f, -0.4f, -0.4f, -0.8f, 0.0f, -0.4f, -0.8f, 0.4f, -0.4f, -0.8f, 0.8f, -0.4f, -0.8f,
-0.8f, 0.0f, -0.8f, -0.4f, 0.0f, -0.8f, 0.0f, 0.0f, -0.8f, 0.4f, 0.0f, -0.8f, 0.8f, 0.0f, -0.8f,
-0.8f, 0.4f, -0.8f, -0.4f, 0.4f, -0.8f, 0.0f, 0.4f, -0.8f, 0.4f, 0.4f, -0.8f, 0.8f, 0.4f, -0.8f,
-0.8f, 0.8f, -0.8f, -0.4f, 0.8f, -0.8f, 0.0f, 0.8f, -0.8f, 0.4f, 0.8f, -0.8f, 0.8f, 0.8f, -0.8f,
-0.8f, -0.8f, -0.4f, -0.4f, -0.8f, -0.4f, 0.0f, -0.8f, -0.4f, 0.4f, -0.8f, -0.4f, 0.8f, -0.8f, -0.4f,
-0.8f, -0.4f, -0.4f, -0.4f, -0.4f, -0.4f, 0.0f, -0.4f, -0.4f, 0.4f, -0.4f, -0.4f, 0.8f, -0.4f, -0.4f,
-0.8f, 0.0f, -0.4f, -0.4f, 0.0f, -0.4f, 0.0f, 0.0f, -0.4f, 0.4f, 0.0f, -0.4f, 0.8f, 0.0f, -0.4f,
-0.8f, 0.4f, -0.4f, -0.4f, 0.4f, -0.4f, 0.0f, 0.4f, -0.4f, 0.4f, 0.4f, -0.4f, 0.8f, 0.4f, -0.4f,
-0.8f, 0.8f, -0.4f, -0.4f, 0.8f, -0.4f, 0.0f, 0.8f, -0.4f, 0.4f, 0.8f, -0.4f, 0.8f, 0.8f, -0.4f,
-0.8f, -0.8f, 0.0f, -0.4f, -0.8f, 0.0f, 0.0f, -0.8f, 0.0f, 0.4f, -0.8f, 0.0f, 0.8f, -0.8f, 0.0f,
-0.8f, -0.4f, 0.0f, -0.4f, -0.4f, 0.0f, 0.0f, -0.4f, 0.0f, 0.4f, -0.4f, 0.0f, 0.8f, -0.4f, 0.0f,
-0.8f, 0.0f, 0.0f, -0.4f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.4f, 0.0f, 0.0f, 0.8f, 0.0f, 0.0f,
-0.8f, 0.4f, 0.0f, -0.4f, 0.4f, 0.0f, 0.0f, 0.4f, 0.0f, 0.4f, 0.4f, 0.0f, 0.8f, 0.4f, 0.0f,
-0.8f, 0.8f, 0.0f, -0.4f, 0.8f, 0.0f, 0.0f, 0.8f, 0.0f, 0.4f, 0.8f, 0.0f, 0.8f, 0.8f, 0.0f,
-0.8f, -0.8f, 0.4f, -0.4f, -0.8f, 0.4f, 0.0f, -0.8f, 0.4f, 0.4f, -0.8f, 0.4f, 0.8f, -0.8f, 0.4f,
-0.8f, -0.4f, 0.4f, -0.4f, -0.4f, 0.4f, 0.0f, -0.4f, 0.4f, 0.4f, -0.4f, 0.4f, 0.8f, -0.4f, 0.4f,
-0.8f, 0.0f, 0.4f, -0.4f, 0.0f, 0.4f, 0.0f, 0.0f, 0.4f, 0.4f, 0.0f, 0.4f, 0.8f, 0.0f, 0.4f,
-0.8f, 0.4f, 0.4f, -0.4f, 0.4f, 0.4f, 0.0f, 0.4f, 0.4f, 0.4f, 0.4f, 0.4f, 0.8f, 0.4f, 0.4f,
-0.8f, 0.8f, 0.4f, -0.4f, 0.8f, 0.4f, 0.0f, 0.8f, 0.4f, 0.4f, 0.8f, 0.4f, 0.8f, 0.8f, 0.4f,
-0.8f, -0.8f, 0.8f, -0.4f, -0.8f, 0.8f, 0.0f, -0.8f, 0.8f, 0.4f, -0.8f, 0.8f, 0.8f, -0.8f, 0.8f,
-0.8f, -0.4f, 0.8f, -0.4f, -0.4f, 0.8f, 0.0f, -0.4f, 0.8f, 0.4f, -0.4f, 0.8f, 0.8f, -0.4f, 0.8f,
-0.8f, 0.0f, 0.8f, -0.4f, 0.0f, 0.8f, 0.0f, 0.0f, 0.8f, 0.4f, 0.0f, 0.8f, 0.8f, 0.0f, 0.8f,
-0.8f, 0.4f, 0.8f, -0.4f, 0.4f, 0.8f, 0.0f, 0.4f, 0.8f, 0.4f, 0.4f, 0.8f, 0.8f, 0.4f, 0.8f,
-0.8f, 0.8f, 0.8f, -0.4f, 0.8f, 0.8f, 0.0f, 0.8f, 0.8f, 0.4f, 0.8f, 0.8f, 0.8f, 0.8f, 0.8f
};
// this table contains 3 requantized samples for each legal codeword
// when grouped in 10 bits, i.e. 9 quantizationsteps per sample
public static final float grouping_10bits[] =
{
-8.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f, 0.0f, -8.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, 0.0f, -6.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, 0.0f, -4.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f, 0.0f, -2.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, 0.0f, -8.0f/9.0f, -6.0f/9.0f, 0.0f, -8.0f/9.0f, -4.0f/9.0f, 0.0f, -8.0f/9.0f,
-2.0f/9.0f, 0.0f, -8.0f/9.0f, 0.0f, 0.0f, -8.0f/9.0f, 2.0f/9.0f, 0.0f, -8.0f/9.0f,
4.0f/9.0f, 0.0f, -8.0f/9.0f, 6.0f/9.0f, 0.0f, -8.0f/9.0f, 8.0f/9.0f, 0.0f, -8.0f/9.0f,
-8.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, 0.0f, 2.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f, 0.0f, 4.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, 0.0f, 6.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f,
-2.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 0.0f, 8.0f/9.0f, -8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f,
4.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f,
-8.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f,
-2.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 0.0f, -8.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f,
4.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -8.0f/9.0f, -6.0f/9.0f,
-8.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f,
-2.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, 0.0f, -6.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f,
4.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f,
-8.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f,
-2.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, 0.0f, -4.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f,
4.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -6.0f/9.0f,
-8.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f,
-2.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f, 0.0f, -2.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f,
4.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, -6.0f/9.0f,
-8.0f/9.0f, 0.0f, -6.0f/9.0f, -6.0f/9.0f, 0.0f, -6.0f/9.0f, -4.0f/9.0f, 0.0f, -6.0f/9.0f,
-2.0f/9.0f, 0.0f, -6.0f/9.0f, 0.0f, 0.0f, -6.0f/9.0f, 2.0f/9.0f, 0.0f, -6.0f/9.0f,
4.0f/9.0f, 0.0f, -6.0f/9.0f, 6.0f/9.0f, 0.0f, -6.0f/9.0f, 8.0f/9.0f, 0.0f, -6.0f/9.0f,
-8.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f,
-2.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, 0.0f, 2.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f,
4.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f,
-8.0f/9.0f, 4.0f/9.0f, -6.0f/9.0f, -6.0f/9.0f, 4.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, 4.0f/9.0f, -6.0f/9.0f,
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-2.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 0.0f, -6.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f,
-8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f,
-2.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 0.0f, -4.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f,
-8.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f,
-2.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 0.0f, -2.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -2.0f/9.0f, 8.0f/9.0f,
-8.0f/9.0f, 0.0f, 8.0f/9.0f, -6.0f/9.0f, 0.0f, 8.0f/9.0f, -4.0f/9.0f, 0.0f, 8.0f/9.0f,
-2.0f/9.0f, 0.0f, 8.0f/9.0f, 0.0f, 0.0f, 8.0f/9.0f, 2.0f/9.0f, 0.0f, 8.0f/9.0f,
4.0f/9.0f, 0.0f, 8.0f/9.0f, 6.0f/9.0f, 0.0f, 8.0f/9.0f, 8.0f/9.0f, 0.0f, 8.0f/9.0f,
-8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f,
-2.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 0.0f, 2.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f,
-8.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f,
-2.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 0.0f, 4.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 4.0f/9.0f, 8.0f/9.0f,
-8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f,
-2.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 0.0f, 6.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f,
-8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, -4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f,
-2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 0.0f, 8.0f/9.0f, 8.0f/9.0f, 2.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f,
4.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 6.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f, 8.0f/9.0f
};
// data taken from ISO/IEC DIS 11172, Annexes 3-B.2[abcd] and 3-B.4:
// subbands 0-2 in tables 3-B.2a and 2b: (index is allocation)
public static final int table_ab1_codelength[] =
// bits per codeword
{ 0, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
public static final float table_ab1_groupingtables[][] =
// pointer to sample grouping table, or NULL-pointer if ungrouped
{ null, grouping_5bits, null, null, null, null, null, null, null, null, null, null, null, null, null, null };
public static final float table_ab1_factor[] =
// factor for requantization: (real)sample * factor - 1.0 gives requantized sample
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f,
1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f,
1.0f/4096.0f, 1.0f/8192.0f, 1.0f/16384.0f, 1.0f/32768.0f };
public static final float table_ab1_c[] =
// factor c for requantization from table 3-B.4
{ 0.0f, 1.33333333333f, 1.14285714286f, 1.06666666666f, 1.03225806452f,
1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f, 1.00097751711f,
1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f, 1.00003051851f,
1.00001525902f };
public static final float table_ab1_d[] =
// addend d for requantization from table 3-B.4
{ 0.0f, 0.50000000000f, 0.25000000000f, 0.12500000000f, 0.06250000000f,
0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f, 0.00195312500f,
0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f, 0.00006103516f,
0.00003051758f };
// subbands 3-... tables 3-B.2a and 2b:
public static final float[] table_ab234_groupingtables[] =
{ null, grouping_5bits, grouping_7bits, null, grouping_10bits, null, null, null, null, null, null, null, null, null, null, null };
// subbands 3-10 in tables 3-B.2a and 2b:
public static final int table_ab2_codelength[] =
{ 0, 5, 7, 3, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16 };
public static final float table_ab2_factor[] =
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f,
1.0f/32.0f, 1.0f/64.0f, 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f,
1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f, 1.0f/32768.0f };
public static final float table_ab2_c[] =
{ 0.0f, 1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f,
1.06666666666f, 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f,
1.00195694716f, 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f,
1.00001525902f };
public static final float table_ab2_d[] =
{ 0.0f, 0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f,
0.12500000000f, 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f,
0.00390625000f, 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f,
0.00003051758f };
// subbands 11-22 in tables 3-B.2a and 2b:
public static final int table_ab3_codelength[] = { 0, 5, 7, 3, 10, 4, 5, 16 };
public static final float table_ab3_factor[] =
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32768.0f };
public static final float table_ab3_c[] =
{ 0.0f, 1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f,
1.06666666666f, 1.03225806452f, 1.00001525902f };
public static final float table_ab3_d[] =
{ 0.0f, 0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f,
0.12500000000f, 0.06250000000f, 0.00003051758f };
// subbands 23-... in tables 3-B.2a and 2b:
public static final int table_ab4_codelength[] = { 0, 5, 7, 16 };
public static final float table_ab4_factor[] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/32768.0f };
public static final float table_ab4_c[] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.00001525902f };
public static final float table_ab4_d[] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.00003051758f };
// subbands in tables 3-B.2c and 2d:
public static final int table_cd_codelength[] =
{ 0, 5, 7, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
public static final float table_cd_groupingtables[][] =
{ null, grouping_5bits, grouping_7bits, grouping_10bits, null, null, null, null, null, null, null, null, null, null, null, null };
public static final float table_cd_factor[] =
{ 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/8.0f, 1.0f/8.0f, 1.0f/16.0f, 1.0f/32.0f, 1.0f/64.0f,
1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f,
1.0f/8192.0f, 1.0f/16384.0f };
public static final float table_cd_c[] =
{ 0.0f, 1.33333333333f, 1.60000000000f, 1.77777777777f, 1.06666666666f,
1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f,
1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f,
1.00003051851f };
public static final float table_cd_d[] =
{ 0.0f, 0.50000000000f, 0.50000000000f, 0.50000000000f, 0.12500000000f,
0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f,
0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f,
0.00006103516f };
protected int subbandnumber;
protected int allocation;
protected int scfsi;
protected float scalefactor1, scalefactor2, scalefactor3;
protected int[] codelength = {0};
protected float groupingtable[][] = new float[2][];
//protected float[][] groupingtable = {{0},{0}} ;
protected float[] factor = {0.0f};
protected int groupnumber;
protected int samplenumber;
protected float[] samples = new float[3];
protected float[] c = {0};
protected float[] d = {0};
/**
* Constructor
*/
public SubbandLayer2(int subbandnumber)
{
this.subbandnumber = subbandnumber;
groupnumber = samplenumber = 0;
}
/**
*
*/
protected int get_allocationlength (Header header)
{
if (header.version() == Header.MPEG1)
{
int channel_bitrate = header.bitrate_index();
// calculate bitrate per channel:
if (header.mode() != Header.SINGLE_CHANNEL)
if (channel_bitrate == 4)
channel_bitrate = 1;
else
channel_bitrate -= 4;
if (channel_bitrate == 1 || channel_bitrate == 2)
// table 3-B.2c or 3-B.2d
if (subbandnumber <= 1)
return 4;
else
return 3;
else
// tables 3-B.2a or 3-B.2b
if (subbandnumber <= 10)
return 4;
else if (subbandnumber <= 22)
return 3;
else
return 2;
}
else
{ // MPEG-2 LSF -- Jeff
// table B.1 of ISO/IEC 13818-3
if (subbandnumber <= 3)
return 4;
else if (subbandnumber <= 10)
return 3;
else
return 2;
}
}
/**
*
*/
protected void prepare_sample_reading(Header header, int allocation,
//float[][] groupingtable,
int channel,
float[] factor, int[] codelength,
float[] c, float[] d)
{
int channel_bitrate = header.bitrate_index();
// calculate bitrate per channel:
if (header.mode() != Header.SINGLE_CHANNEL)
if (channel_bitrate == 4)
channel_bitrate = 1;
else
channel_bitrate -= 4;
if (channel_bitrate == 1 || channel_bitrate == 2)
{
// table 3-B.2c or 3-B.2d
groupingtable[channel] = table_cd_groupingtables[allocation];
factor[0] = table_cd_factor[allocation];
codelength[0] = table_cd_codelength[allocation];
c[0] = table_cd_c[allocation];
d[0] = table_cd_d[allocation];
}
else
{
// tables 3-B.2a or 3-B.2b
if (subbandnumber <= 2)
{
groupingtable[channel] = table_ab1_groupingtables[allocation];
factor[0] = table_ab1_factor[allocation];
codelength[0] = table_ab1_codelength[allocation];
c[0] = table_ab1_c[allocation];
d[0] = table_ab1_d[allocation];
}
else
{
groupingtable[channel] = table_ab234_groupingtables[allocation];
if (subbandnumber <= 10)
{
factor[0] = table_ab2_factor[allocation];
codelength[0] = table_ab2_codelength[allocation];
c[0] = table_ab2_c[allocation];
d[0] = table_ab2_d[allocation];
}
else if (subbandnumber <= 22)
{
factor[0] = table_ab3_factor[allocation];
codelength[0] = table_ab3_codelength[allocation];
c[0] = table_ab3_c[allocation];
d[0] = table_ab3_d[allocation];
}
else
{
factor[0] = table_ab4_factor[allocation];
codelength[0] = table_ab4_codelength[allocation];
c[0] = table_ab4_c[allocation];
d[0] = table_ab4_d[allocation];
}
}
}
}
/**
*
*/
public void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
int length = get_allocationlength(header);
allocation = stream.get_bits(length);
if (crc != null)
crc.add_bits(allocation, length);
}
/**
*
*/
public void read_scalefactor_selection (Bitstream stream, Crc16 crc)
{
if (allocation != 0)
{
scfsi = stream.get_bits(2);
if (crc != null) crc.add_bits(scfsi, 2);
}
}
/**
*
*/
public void read_scalefactor (Bitstream stream, Header header)
{
if (allocation != 0)
{
switch (scfsi)
{
case 0:
scalefactor1 = scalefactors[stream.get_bits(6)];
scalefactor2 = scalefactors[stream.get_bits(6)];
scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 1:
scalefactor1 = scalefactor2 = scalefactors[stream.get_bits(6)];
scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 2:
scalefactor1 = scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 3:
scalefactor1 = scalefactors[stream.get_bits(6)];
scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)];
break;
}
prepare_sample_reading(header, allocation, 0,
factor, codelength, c, d);
}
}
/**
*
*/
public boolean read_sampledata (Bitstream stream)
{
if (allocation != 0)
if (groupingtable[0] != null)
{
int samplecode = stream.get_bits(codelength[0]);
// create requantized samples:
samplecode += samplecode << 1;
float[] target = samples;
float[] source = groupingtable[0];
/*
int tmp = 0;
int temp = 0;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp] = source[samplecode + temp];
*/
//Bugfix:
int tmp = 0;
int temp = samplecode;
if(temp > source.length - 3) temp = source.length - 3;
target[tmp] = source[temp];
temp++;tmp++;
target[tmp] = source[temp];
temp++;tmp++;
target[tmp] = source[temp];
// memcpy (samples, groupingtable + samplecode, 3 * sizeof (real));
}
else
{
samples[0] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
samples[1] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
samples[2] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
}
samplenumber = 0;
if (++groupnumber == 12)
return true;
else
return false;
}
/**
*
*/
public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2)
{
if ((allocation != 0) && (channels != OutputChannels.RIGHT_CHANNEL))
{
float sample = samples[samplenumber];
if (groupingtable[0] == null)
sample = (sample + d[0]) * c[0];
if (groupnumber <= 4)
sample *= scalefactor1;
else if (groupnumber <= 8)
sample *= scalefactor2;
else
sample *= scalefactor3;
filter1.input_sample(sample, subbandnumber);
}
if (++samplenumber == 3)
return true;
else
return false;
}
};
/**
* Class for layer II subbands in joint stereo mode.
*/
static class SubbandLayer2IntensityStereo extends SubbandLayer2
{
protected int channel2_scfsi;
protected float channel2_scalefactor1, channel2_scalefactor2, channel2_scalefactor3;
/**
* Constructor
*/
public SubbandLayer2IntensityStereo (int subbandnumber)
{
super(subbandnumber);
}
/**
*
*/
public void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
super.read_allocation (stream, header, crc);
}
/**
*
*/
public void read_scalefactor_selection(Bitstream stream, Crc16 crc)
{
if (allocation != 0)
{
scfsi = stream.get_bits(2);
channel2_scfsi = stream.get_bits(2);
if (crc != null)
{
crc.add_bits(scfsi, 2);
crc.add_bits(channel2_scfsi, 2);
}
}
}
/**
*
*/
public void read_scalefactor(Bitstream stream, Header header)
{
if (allocation != 0)
{
super.read_scalefactor(stream, header);
switch (channel2_scfsi)
{
case 0:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 1:
channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream.get_bits (6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 2:
channel2_scalefactor1 = channel2_scalefactor2 =
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 3:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits (6)];
break;
}
}
}
/**
*
*/
public boolean read_sampledata(Bitstream stream)
{
return super.read_sampledata (stream);
}
/**
*
*/
public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2)
{
if (allocation != 0)
{
float sample = samples[samplenumber];
if (groupingtable[0] == null)
sample = (sample + d[0]) * c[0];
if (channels == OutputChannels.BOTH_CHANNELS)
{
float sample2 = sample;
if (groupnumber <= 4)
{
sample *= scalefactor1;
sample2 *= channel2_scalefactor1;
}
else if (groupnumber <= 8)
{
sample *= scalefactor2;
sample2 *= channel2_scalefactor2;
}
else
{
sample *= scalefactor3;
sample2 *= channel2_scalefactor3;
}
filter1.input_sample(sample, subbandnumber);
filter2.input_sample(sample2, subbandnumber);
}
else if (channels == OutputChannels.LEFT_CHANNEL)
{
if (groupnumber <= 4)
sample *= scalefactor1;
else if (groupnumber <= 8)
sample *= scalefactor2;
else
sample *= scalefactor3;
filter1.input_sample(sample, subbandnumber);
}
else
{
if (groupnumber <= 4)
sample *= channel2_scalefactor1;
else if (groupnumber <= 8)
sample *= channel2_scalefactor2;
else
sample *= channel2_scalefactor3;
filter1.input_sample(sample, subbandnumber);
}
}
if (++samplenumber == 3)
return true;
else
return false;
}
};
/**
* Class for layer II subbands in stereo mode.
*/
static class SubbandLayer2Stereo extends SubbandLayer2
{
protected int channel2_allocation;
protected int channel2_scfsi;
protected float channel2_scalefactor1, channel2_scalefactor2, channel2_scalefactor3;
//protected boolean channel2_grouping; ???? Never used!
protected int[] channel2_codelength = {0};
//protected float[][] channel2_groupingtable = {{0},{0}};
protected float[] channel2_factor = {0};
protected float[] channel2_samples;
protected float[] channel2_c = {0};
protected float[] channel2_d = {0};
/**
* Constructor
*/
public SubbandLayer2Stereo(int subbandnumber)
{
super(subbandnumber);
channel2_samples = new float[3];
}
/**
*
*/
public void read_allocation (Bitstream stream, Header header, Crc16 crc)
{
int length = get_allocationlength(header);
allocation = stream.get_bits(length);
channel2_allocation = stream.get_bits(length);
if (crc != null)
{
crc.add_bits(allocation, length);
crc.add_bits(channel2_allocation, length);
}
}
/**
*
*/
public void read_scalefactor_selection(Bitstream stream, Crc16 crc)
{
if (allocation != 0)
{
scfsi = stream.get_bits(2);
if (crc != null)
crc.add_bits(scfsi, 2);
}
if (channel2_allocation != 0)
{
channel2_scfsi = stream.get_bits(2);
if (crc != null)
crc.add_bits(channel2_scfsi, 2);
}
}
/**
*
*/
public void read_scalefactor(Bitstream stream, Header header)
{
super.read_scalefactor(stream, header);
if (channel2_allocation != 0)
{
switch (channel2_scfsi)
{
case 0:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 1:
channel2_scalefactor1 = channel2_scalefactor2 =
scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 2:
channel2_scalefactor1 = channel2_scalefactor2 =
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 3:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = channel2_scalefactor3 =
scalefactors[stream.get_bits(6)];
break;
}
prepare_sample_reading(header, channel2_allocation, 1,
channel2_factor, channel2_codelength, channel2_c,
channel2_d);
}
}
/**
*
*/
public boolean read_sampledata (Bitstream stream)
{
boolean returnvalue = super.read_sampledata(stream);
if (channel2_allocation != 0)
if (groupingtable[1] != null)
{
int samplecode = stream.get_bits(channel2_codelength[0]);
// create requantized samples:
samplecode += samplecode << 1;
/*
float[] target = channel2_samples;
float[] source = channel2_groupingtable[0];
int tmp = 0;
int temp = 0;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp] = source[samplecode + temp];
// memcpy (channel2_samples, channel2_groupingtable + samplecode, 3 * sizeof (real));
*/
float[] target = channel2_samples;
float[] source = groupingtable[1];
int tmp = 0;
int temp = samplecode;
target[tmp] = source[temp];
temp++;tmp++;
target[tmp] = source[temp];
temp++;tmp++;
target[tmp] = source[temp];
}
else
{
channel2_samples[0] = (float) ((stream.get_bits(channel2_codelength[0])) *
channel2_factor[0] - 1.0);
channel2_samples[1] = (float) ((stream.get_bits(channel2_codelength[0])) *
channel2_factor[0] - 1.0);
channel2_samples[2] = (float) ((stream.get_bits(channel2_codelength[0])) *
channel2_factor[0] - 1.0);
}
return returnvalue;
}
/**
*
*/
public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2)
{
boolean returnvalue = super.put_next_sample(channels, filter1, filter2);
if ((channel2_allocation != 0) && (channels != OutputChannels.LEFT_CHANNEL))
{
float sample = channel2_samples[samplenumber - 1];
if (groupingtable[1] == null)
sample = (sample + channel2_d[0]) * channel2_c[0];
if (groupnumber <= 4)
sample *= channel2_scalefactor1;
else if (groupnumber <= 8)
sample *= channel2_scalefactor2;
else
sample *= channel2_scalefactor3;
if (channels == OutputChannels.BOTH_CHANNELS)
filter2.input_sample(sample, subbandnumber);
else
filter1.input_sample(sample, subbandnumber);
}
return returnvalue;
}
}
}
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