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Diffstat (limited to 'songdbj/javazoom/jl/decoder/LayerIIDecoder.java')
-rw-r--r--songdbj/javazoom/jl/decoder/LayerIIDecoder.java1064
1 files changed, 1064 insertions, 0 deletions
diff --git a/songdbj/javazoom/jl/decoder/LayerIIDecoder.java b/songdbj/javazoom/jl/decoder/LayerIIDecoder.java
new file mode 100644
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+++ b/songdbj/javazoom/jl/decoder/LayerIIDecoder.java
@@ -0,0 +1,1064 @@
+/*
+ * 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. mdm@techie.com
+ *
+ * 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,
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+ -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
+ };
+
+ // 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;
+ }
+ }
+}
generated by cgit v1.1 at 2026-04-26 21:26:50 +0000