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-rw-r--r--songdbj/javazoom/jl/decoder/LayerIIDecoder.java1064
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diff --git a/songdbj/javazoom/jl/decoder/LayerIIDecoder.java b/songdbj/javazoom/jl/decoder/LayerIIDecoder.java
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1/*
2 * 11/19/04 1.0 moved to LGPL.
3 *
4 * 29/05/01 Michael Scheerer, Fixed some C++ to Java porting bugs.
5 *
6 * 16/07/01 Michael Scheerer, Catched a bug in method
7 * read_sampledata, which causes an outOfIndexException.
8 *
9 * 12/12/99 Initial version. Adapted from javalayer.java
10 * and Subband*.java. mdm@techie.com
11 *
12 * 02/28/99 Initial version : javalayer.java by E.B
13 *-----------------------------------------------------------------------
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as published
16 * by the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
23 *
24 * You should have received a copy of the GNU Library General Public
25 * License along with this program; if not, write to the Free Software
26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 *----------------------------------------------------------------------
28 */
29
30package javazoom.jl.decoder;
31
32/**
33 * Implements decoding of MPEG Audio Layer II frames.
34 */
35class LayerIIDecoder extends LayerIDecoder implements FrameDecoder
36{
37
38 public LayerIIDecoder()
39 {
40 }
41
42
43 protected void createSubbands()
44 {
45 int i;
46 if (mode == Header.SINGLE_CHANNEL)
47 for (i = 0; i < num_subbands; ++i)
48 subbands[i] = new SubbandLayer2(i);
49 else if (mode == Header.JOINT_STEREO)
50 {
51 for (i = 0; i < header.intensity_stereo_bound(); ++i)
52 subbands[i] = new SubbandLayer2Stereo(i);
53 for (; i < num_subbands; ++i)
54 subbands[i] = new SubbandLayer2IntensityStereo(i);
55 }
56 else
57 {
58 for (i = 0; i < num_subbands; ++i)
59 subbands[i] = new SubbandLayer2Stereo(i);
60 }
61
62 }
63
64 protected void readScaleFactorSelection()
65 {
66 for (int i = 0; i < num_subbands; ++i)
67 ((SubbandLayer2)subbands[i]).read_scalefactor_selection(stream, crc);
68 }
69
70
71
72 /**
73 * Class for layer II subbands in single channel mode.
74 */
75 static class SubbandLayer2 extends Subband
76 {
77 // this table contains 3 requantized samples for each legal codeword
78 // when grouped in 5 bits, i.e. 3 quantizationsteps per sample
79 public static final float grouping_5bits[] = new float[]
80 {
81 -2.0f/3.0f, -2.0f/3.0f, -2.0f/3.0f,
82 0.0f, -2.0f/3.0f, -2.0f/3.0f,
83 2.0f/3.0f, -2.0f/3.0f, -2.0f/3.0f,
84 -2.0f/3.0f, 0.0f, -2.0f/3.0f,
85 0.0f, 0.0f, -2.0f/3.0f,
86 2.0f/3.0f, 0.0f, -2.0f/3.0f,
87 -2.0f/3.0f, 2.0f/3.0f, -2.0f/3.0f,
88 0.0f, 2.0f/3.0f, -2.0f/3.0f,
89 2.0f/3.0f, 2.0f/3.0f, -2.0f/3.0f,
90 -2.0f/3.0f, -2.0f/3.0f, 0.0f,
91 0.0f, -2.0f/3.0f, 0.0f,
92 2.0f/3.0f, -2.0f/3.0f, 0.0f,
93 -2.0f/3.0f, 0.0f, 0.0f,
94 0.0f, 0.0f, 0.0f,
95 2.0f/3.0f, 0.0f, 0.0f,
96 -2.0f/3.0f, 2.0f/3.0f, 0.0f,
97 0.0f, 2.0f/3.0f, 0.0f,
98 2.0f/3.0f, 2.0f/3.0f, 0.0f,
99 -2.0f/3.0f, -2.0f/3.0f, 2.0f/3.0f,
100 0.0f, -2.0f/3.0f, 2.0f/3.0f,
101 2.0f/3.0f, -2.0f/3.0f, 2.0f/3.0f,
102 -2.0f/3.0f, 0.0f, 2.0f/3.0f,
103 0.0f, 0.0f, 2.0f/3.0f,
104 2.0f/3.0f, 0.0f, 2.0f/3.0f,
105 -2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f,
106 0.0f, 2.0f/3.0f, 2.0f/3.0f,
107 2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f
108 };
109
110 // this table contains 3 requantized samples for each legal codeword
111 // when grouped in 7 bits, i.e. 5 quantizationsteps per sample
112 public static final float grouping_7bits[] = new float[]
113 {
114 -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,
115 -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,
116 -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,
117 -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,
118 -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,
119 -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,
120 -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,
121 -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,
122 -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,
123 -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,
124 -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,
125 -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,
126 -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,
127 -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,
128 -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,
129 -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,
130 -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,
131 -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,
132 -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,
133 -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,
134 -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,
135 -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,
136 -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,
137 -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,
138 -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
139 };
140
141 // this table contains 3 requantized samples for each legal codeword
142 // when grouped in 10 bits, i.e. 9 quantizationsteps per sample
143 public static final float grouping_10bits[] =
144 {
145 -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,
146 -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,
147 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,
148 -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,
149 -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,
150 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,
151 -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,
152 -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,
153 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,
154 -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,
155 -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,
156 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,
157 -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,
158 -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,
159 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,
160 -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,
161 -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,
162 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,
163 -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,
164 -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,
165 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,
166 -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,
167 -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,
168 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,
169 -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,
170 -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,
171 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,
172 -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,
173 -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,
174 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,
175 -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,
176 -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,
177 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,
178 -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,
179 -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,
180 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,
181 -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,
182 -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,
183 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,
184 -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,
185 -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,
186 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,
187 -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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361 -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,
362 -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,
363 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,
364 -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,
365 -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,
366 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,
367 -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,
368 -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,
369 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,
370 -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,
371 -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,
372 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,
373 -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,
374 -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,
375 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,
376 -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,
377 -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,
378 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,
379 -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,
380 -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,
381 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,
382 -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,
383 -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,
384 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,
385 -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,
386 -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,
387 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
388 };
389
390 // data taken from ISO/IEC DIS 11172, Annexes 3-B.2[abcd] and 3-B.4:
391
392 // subbands 0-2 in tables 3-B.2a and 2b: (index is allocation)
393 public static final int table_ab1_codelength[] =
394 // bits per codeword
395 { 0, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
396
397 public static final float table_ab1_groupingtables[][] =
398 // pointer to sample grouping table, or NULL-pointer if ungrouped
399 { null, grouping_5bits, null, null, null, null, null, null, null, null, null, null, null, null, null, null };
400
401 public static final float table_ab1_factor[] =
402 // factor for requantization: (real)sample * factor - 1.0 gives requantized sample
403 { 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,
404 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f,
405 1.0f/4096.0f, 1.0f/8192.0f, 1.0f/16384.0f, 1.0f/32768.0f };
406
407 public static final float table_ab1_c[] =
408 // factor c for requantization from table 3-B.4
409 { 0.0f, 1.33333333333f, 1.14285714286f, 1.06666666666f, 1.03225806452f,
410 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f, 1.00097751711f,
411 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f, 1.00003051851f,
412 1.00001525902f };
413
414 public static final float table_ab1_d[] =
415 // addend d for requantization from table 3-B.4
416 { 0.0f, 0.50000000000f, 0.25000000000f, 0.12500000000f, 0.06250000000f,
417 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f, 0.00195312500f,
418 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f, 0.00006103516f,
419 0.00003051758f };
420
421 // subbands 3-... tables 3-B.2a and 2b:
422 public static final float[] table_ab234_groupingtables[] =
423 { null, grouping_5bits, grouping_7bits, null, grouping_10bits, null, null, null, null, null, null, null, null, null, null, null };
424
425 // subbands 3-10 in tables 3-B.2a and 2b:
426 public static final int table_ab2_codelength[] =
427 { 0, 5, 7, 3, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16 };
428 public static final float table_ab2_factor[] =
429 { 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,
430 1.0f/32.0f, 1.0f/64.0f, 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f,
431 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f, 1.0f/32768.0f };
432 public static final float table_ab2_c[] =
433 { 0.0f, 1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f,
434 1.06666666666f, 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f,
435 1.00195694716f, 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f,
436 1.00001525902f };
437 public static final float table_ab2_d[] =
438 { 0.0f, 0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f,
439 0.12500000000f, 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f,
440 0.00390625000f, 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f,
441 0.00003051758f };
442
443 // subbands 11-22 in tables 3-B.2a and 2b:
444 public static final int table_ab3_codelength[] = { 0, 5, 7, 3, 10, 4, 5, 16 };
445 public static final float table_ab3_factor[] =
446 { 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 };
447 public static final float table_ab3_c[] =
448 { 0.0f, 1.33333333333f, 1.60000000000f, 1.14285714286f, 1.77777777777f,
449 1.06666666666f, 1.03225806452f, 1.00001525902f };
450 public static final float table_ab3_d[] =
451 { 0.0f, 0.50000000000f, 0.50000000000f, 0.25000000000f, 0.50000000000f,
452 0.12500000000f, 0.06250000000f, 0.00003051758f };
453
454 // subbands 23-... in tables 3-B.2a and 2b:
455 public static final int table_ab4_codelength[] = { 0, 5, 7, 16 };
456 public static final float table_ab4_factor[] = { 0.0f, 1.0f/2.0f, 1.0f/4.0f, 1.0f/32768.0f };
457 public static final float table_ab4_c[] = { 0.0f, 1.33333333333f, 1.60000000000f, 1.00001525902f };
458 public static final float table_ab4_d[] = { 0.0f, 0.50000000000f, 0.50000000000f, 0.00003051758f };
459
460 // subbands in tables 3-B.2c and 2d:
461 public static final int table_cd_codelength[] =
462 { 0, 5, 7, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
463 public static final float table_cd_groupingtables[][] =
464 { null, grouping_5bits, grouping_7bits, grouping_10bits, null, null, null, null, null, null, null, null, null, null, null, null };
465 public static final float table_cd_factor[] =
466 { 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,
467 1.0f/128.0f, 1.0f/256.0f, 1.0f/512.0f, 1.0f/1024.0f, 1.0f/2048.0f, 1.0f/4096.0f,
468 1.0f/8192.0f, 1.0f/16384.0f };
469 public static final float table_cd_c[] =
470 { 0.0f, 1.33333333333f, 1.60000000000f, 1.77777777777f, 1.06666666666f,
471 1.03225806452f, 1.01587301587f, 1.00787401575f, 1.00392156863f, 1.00195694716f,
472 1.00097751711f, 1.00048851979f, 1.00024420024f, 1.00012208522f, 1.00006103888f,
473 1.00003051851f };
474 public static final float table_cd_d[] =
475 { 0.0f, 0.50000000000f, 0.50000000000f, 0.50000000000f, 0.12500000000f,
476 0.06250000000f, 0.03125000000f, 0.01562500000f, 0.00781250000f, 0.00390625000f,
477 0.00195312500f, 0.00097656250f, 0.00048828125f, 0.00024414063f, 0.00012207031f,
478 0.00006103516f };
479
480
481
482 protected int subbandnumber;
483 protected int allocation;
484 protected int scfsi;
485 protected float scalefactor1, scalefactor2, scalefactor3;
486 protected int[] codelength = {0};
487 protected float groupingtable[][] = new float[2][];
488 //protected float[][] groupingtable = {{0},{0}} ;
489 protected float[] factor = {0.0f};
490 protected int groupnumber;
491 protected int samplenumber;
492 protected float[] samples = new float[3];
493 protected float[] c = {0};
494 protected float[] d = {0};
495 /**
496 * Constructor
497 */
498 public SubbandLayer2(int subbandnumber)
499 {
500 this.subbandnumber = subbandnumber;
501 groupnumber = samplenumber = 0;
502 }
503
504
505 /**
506 *
507 */
508 protected int get_allocationlength (Header header)
509 {
510 if (header.version() == Header.MPEG1)
511 {
512 int channel_bitrate = header.bitrate_index();
513
514 // calculate bitrate per channel:
515 if (header.mode() != Header.SINGLE_CHANNEL)
516 if (channel_bitrate == 4)
517 channel_bitrate = 1;
518 else
519 channel_bitrate -= 4;
520
521 if (channel_bitrate == 1 || channel_bitrate == 2)
522 // table 3-B.2c or 3-B.2d
523 if (subbandnumber <= 1)
524 return 4;
525 else
526 return 3;
527 else
528 // tables 3-B.2a or 3-B.2b
529 if (subbandnumber <= 10)
530 return 4;
531 else if (subbandnumber <= 22)
532 return 3;
533 else
534 return 2;
535 }
536 else
537 { // MPEG-2 LSF -- Jeff
538
539 // table B.1 of ISO/IEC 13818-3
540 if (subbandnumber <= 3)
541 return 4;
542 else if (subbandnumber <= 10)
543 return 3;
544 else
545 return 2;
546 }
547 }
548
549 /**
550 *
551 */
552 protected void prepare_sample_reading(Header header, int allocation,
553 //float[][] groupingtable,
554 int channel,
555 float[] factor, int[] codelength,
556 float[] c, float[] d)
557 {
558 int channel_bitrate = header.bitrate_index();
559 // calculate bitrate per channel:
560 if (header.mode() != Header.SINGLE_CHANNEL)
561 if (channel_bitrate == 4)
562 channel_bitrate = 1;
563 else
564 channel_bitrate -= 4;
565
566 if (channel_bitrate == 1 || channel_bitrate == 2)
567 {
568 // table 3-B.2c or 3-B.2d
569 groupingtable[channel] = table_cd_groupingtables[allocation];
570 factor[0] = table_cd_factor[allocation];
571 codelength[0] = table_cd_codelength[allocation];
572 c[0] = table_cd_c[allocation];
573 d[0] = table_cd_d[allocation];
574 }
575 else
576 {
577 // tables 3-B.2a or 3-B.2b
578 if (subbandnumber <= 2)
579 {
580 groupingtable[channel] = table_ab1_groupingtables[allocation];
581 factor[0] = table_ab1_factor[allocation];
582 codelength[0] = table_ab1_codelength[allocation];
583 c[0] = table_ab1_c[allocation];
584 d[0] = table_ab1_d[allocation];
585 }
586 else
587 {
588 groupingtable[channel] = table_ab234_groupingtables[allocation];
589 if (subbandnumber <= 10)
590 {
591 factor[0] = table_ab2_factor[allocation];
592 codelength[0] = table_ab2_codelength[allocation];
593 c[0] = table_ab2_c[allocation];
594 d[0] = table_ab2_d[allocation];
595 }
596 else if (subbandnumber <= 22)
597 {
598 factor[0] = table_ab3_factor[allocation];
599 codelength[0] = table_ab3_codelength[allocation];
600 c[0] = table_ab3_c[allocation];
601 d[0] = table_ab3_d[allocation];
602 }
603 else
604 {
605 factor[0] = table_ab4_factor[allocation];
606 codelength[0] = table_ab4_codelength[allocation];
607 c[0] = table_ab4_c[allocation];
608 d[0] = table_ab4_d[allocation];
609 }
610 }
611 }
612 }
613
614
615 /**
616 *
617 */
618 public void read_allocation(Bitstream stream, Header header, Crc16 crc)
619 {
620 int length = get_allocationlength(header);
621 allocation = stream.get_bits(length);
622 if (crc != null)
623 crc.add_bits(allocation, length);
624 }
625
626 /**
627 *
628 */
629 public void read_scalefactor_selection (Bitstream stream, Crc16 crc)
630 {
631 if (allocation != 0)
632 {
633 scfsi = stream.get_bits(2);
634 if (crc != null) crc.add_bits(scfsi, 2);
635 }
636 }
637
638 /**
639 *
640 */
641 public void read_scalefactor (Bitstream stream, Header header)
642 {
643 if (allocation != 0)
644 {
645 switch (scfsi)
646 {
647 case 0:
648 scalefactor1 = scalefactors[stream.get_bits(6)];
649 scalefactor2 = scalefactors[stream.get_bits(6)];
650 scalefactor3 = scalefactors[stream.get_bits(6)];
651 break;
652 case 1:
653 scalefactor1 = scalefactor2 = scalefactors[stream.get_bits(6)];
654 scalefactor3 = scalefactors[stream.get_bits(6)];
655 break;
656 case 2:
657 scalefactor1 = scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)];
658 break;
659 case 3:
660 scalefactor1 = scalefactors[stream.get_bits(6)];
661 scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)];
662 break;
663 }
664 prepare_sample_reading(header, allocation, 0,
665 factor, codelength, c, d);
666 }
667 }
668
669 /**
670 *
671 */
672 public boolean read_sampledata (Bitstream stream)
673 {
674 if (allocation != 0)
675 if (groupingtable[0] != null)
676 {
677 int samplecode = stream.get_bits(codelength[0]);
678 // create requantized samples:
679 samplecode += samplecode << 1;
680 float[] target = samples;
681 float[] source = groupingtable[0];
682 /*
683 int tmp = 0;
684 int temp = 0;
685 target[tmp++] = source[samplecode + temp];
686 temp++;
687 target[tmp++] = source[samplecode + temp];
688 temp++;
689 target[tmp] = source[samplecode + temp];
690 */
691 //Bugfix:
692 int tmp = 0;
693 int temp = samplecode;
694
695 if(temp > source.length - 3) temp = source.length - 3;
696
697 target[tmp] = source[temp];
698 temp++;tmp++;
699 target[tmp] = source[temp];
700 temp++;tmp++;
701 target[tmp] = source[temp];
702
703 // memcpy (samples, groupingtable + samplecode, 3 * sizeof (real));
704 }
705 else
706 {
707 samples[0] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
708 samples[1] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
709 samples[2] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
710 }
711
712 samplenumber = 0;
713 if (++groupnumber == 12)
714 return true;
715 else
716 return false;
717 }
718
719 /**
720 *
721 */
722 public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2)
723 {
724 if ((allocation != 0) && (channels != OutputChannels.RIGHT_CHANNEL))
725 {
726 float sample = samples[samplenumber];
727
728 if (groupingtable[0] == null)
729 sample = (sample + d[0]) * c[0];
730 if (groupnumber <= 4)
731 sample *= scalefactor1;
732 else if (groupnumber <= 8)
733 sample *= scalefactor2;
734 else
735 sample *= scalefactor3;
736 filter1.input_sample(sample, subbandnumber);
737 }
738
739 if (++samplenumber == 3)
740 return true;
741 else
742 return false;
743 }
744 };
745
746 /**
747 * Class for layer II subbands in joint stereo mode.
748 */
749 static class SubbandLayer2IntensityStereo extends SubbandLayer2
750 {
751 protected int channel2_scfsi;
752 protected float channel2_scalefactor1, channel2_scalefactor2, channel2_scalefactor3;
753
754 /**
755 * Constructor
756 */
757 public SubbandLayer2IntensityStereo (int subbandnumber)
758 {
759 super(subbandnumber);
760 }
761
762 /**
763 *
764 */
765 public void read_allocation(Bitstream stream, Header header, Crc16 crc)
766 {
767 super.read_allocation (stream, header, crc);
768 }
769
770 /**
771 *
772 */
773 public void read_scalefactor_selection(Bitstream stream, Crc16 crc)
774 {
775 if (allocation != 0)
776 {
777 scfsi = stream.get_bits(2);
778 channel2_scfsi = stream.get_bits(2);
779 if (crc != null)
780 {
781 crc.add_bits(scfsi, 2);
782 crc.add_bits(channel2_scfsi, 2);
783 }
784 }
785 }
786
787 /**
788 *
789 */
790 public void read_scalefactor(Bitstream stream, Header header)
791 {
792 if (allocation != 0)
793 {
794 super.read_scalefactor(stream, header);
795 switch (channel2_scfsi)
796 {
797 case 0:
798 channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
799 channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
800 channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
801 break;
802
803 case 1:
804 channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream.get_bits (6)];
805 channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
806 break;
807
808 case 2:
809 channel2_scalefactor1 = channel2_scalefactor2 =
810 channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
811 break;
812
813 case 3:
814 channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
815 channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits (6)];
816 break;
817 }
818 }
819
820 }
821
822 /**
823 *
824 */
825 public boolean read_sampledata(Bitstream stream)
826 {
827 return super.read_sampledata (stream);
828 }
829
830 /**
831 *
832 */
833 public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2)
834 {
835 if (allocation != 0)
836 {
837 float sample = samples[samplenumber];
838
839 if (groupingtable[0] == null)
840 sample = (sample + d[0]) * c[0];
841 if (channels == OutputChannels.BOTH_CHANNELS)
842 {
843 float sample2 = sample;
844 if (groupnumber <= 4)
845 {
846 sample *= scalefactor1;
847 sample2 *= channel2_scalefactor1;
848 }
849 else if (groupnumber <= 8)
850 {
851 sample *= scalefactor2;
852 sample2 *= channel2_scalefactor2;
853 }
854 else
855 {
856 sample *= scalefactor3;
857 sample2 *= channel2_scalefactor3;
858 }
859 filter1.input_sample(sample, subbandnumber);
860 filter2.input_sample(sample2, subbandnumber);
861 }
862 else if (channels == OutputChannels.LEFT_CHANNEL)
863 {
864 if (groupnumber <= 4)
865 sample *= scalefactor1;
866 else if (groupnumber <= 8)
867 sample *= scalefactor2;
868 else
869 sample *= scalefactor3;
870 filter1.input_sample(sample, subbandnumber);
871 }
872 else
873 {
874 if (groupnumber <= 4)
875 sample *= channel2_scalefactor1;
876 else if (groupnumber <= 8)
877 sample *= channel2_scalefactor2;
878 else
879 sample *= channel2_scalefactor3;
880 filter1.input_sample(sample, subbandnumber);
881 }
882 }
883
884 if (++samplenumber == 3)
885 return true;
886 else
887 return false;
888 }
889 };
890
891 /**
892 * Class for layer II subbands in stereo mode.
893 */
894 static class SubbandLayer2Stereo extends SubbandLayer2
895 {
896 protected int channel2_allocation;
897 protected int channel2_scfsi;
898 protected float channel2_scalefactor1, channel2_scalefactor2, channel2_scalefactor3;
899 //protected boolean channel2_grouping; ???? Never used!
900 protected int[] channel2_codelength = {0};
901 //protected float[][] channel2_groupingtable = {{0},{0}};
902 protected float[] channel2_factor = {0};
903 protected float[] channel2_samples;
904 protected float[] channel2_c = {0};
905 protected float[] channel2_d = {0};
906
907 /**
908 * Constructor
909 */
910 public SubbandLayer2Stereo(int subbandnumber)
911 {
912 super(subbandnumber);
913 channel2_samples = new float[3];
914 }
915
916 /**
917 *
918 */
919 public void read_allocation (Bitstream stream, Header header, Crc16 crc)
920 {
921 int length = get_allocationlength(header);
922 allocation = stream.get_bits(length);
923 channel2_allocation = stream.get_bits(length);
924 if (crc != null)
925 {
926 crc.add_bits(allocation, length);
927 crc.add_bits(channel2_allocation, length);
928 }
929 }
930
931 /**
932 *
933 */
934 public void read_scalefactor_selection(Bitstream stream, Crc16 crc)
935 {
936 if (allocation != 0)
937 {
938 scfsi = stream.get_bits(2);
939 if (crc != null)
940 crc.add_bits(scfsi, 2);
941 }
942 if (channel2_allocation != 0)
943 {
944 channel2_scfsi = stream.get_bits(2);
945 if (crc != null)
946 crc.add_bits(channel2_scfsi, 2);
947 }
948 }
949
950 /**
951 *
952 */
953 public void read_scalefactor(Bitstream stream, Header header)
954 {
955 super.read_scalefactor(stream, header);
956 if (channel2_allocation != 0)
957 {
958 switch (channel2_scfsi)
959 {
960 case 0:
961 channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
962 channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
963 channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
964 break;
965
966 case 1:
967 channel2_scalefactor1 = channel2_scalefactor2 =
968 scalefactors[stream.get_bits(6)];
969 channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
970 break;
971
972 case 2:
973 channel2_scalefactor1 = channel2_scalefactor2 =
974 channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
975 break;
976
977 case 3:
978 channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
979 channel2_scalefactor2 = channel2_scalefactor3 =
980 scalefactors[stream.get_bits(6)];
981 break;
982 }
983 prepare_sample_reading(header, channel2_allocation, 1,
984 channel2_factor, channel2_codelength, channel2_c,
985 channel2_d);
986 }
987 }
988
989 /**
990 *
991 */
992 public boolean read_sampledata (Bitstream stream)
993 {
994 boolean returnvalue = super.read_sampledata(stream);
995
996 if (channel2_allocation != 0)
997 if (groupingtable[1] != null)
998 {
999 int samplecode = stream.get_bits(channel2_codelength[0]);
1000 // create requantized samples:
1001 samplecode += samplecode << 1;
1002 /*
1003 float[] target = channel2_samples;
1004 float[] source = channel2_groupingtable[0];
1005 int tmp = 0;
1006 int temp = 0;
1007 target[tmp++] = source[samplecode + temp];
1008 temp++;
1009 target[tmp++] = source[samplecode + temp];
1010 temp++;
1011 target[tmp] = source[samplecode + temp];
1012 // memcpy (channel2_samples, channel2_groupingtable + samplecode, 3 * sizeof (real));
1013 */
1014 float[] target = channel2_samples;
1015 float[] source = groupingtable[1];
1016 int tmp = 0;
1017 int temp = samplecode;
1018 target[tmp] = source[temp];
1019 temp++;tmp++;
1020 target[tmp] = source[temp];
1021 temp++;tmp++;
1022 target[tmp] = source[temp];
1023
1024 }
1025 else
1026 {
1027 channel2_samples[0] = (float) ((stream.get_bits(channel2_codelength[0])) *
1028 channel2_factor[0] - 1.0);
1029 channel2_samples[1] = (float) ((stream.get_bits(channel2_codelength[0])) *
1030 channel2_factor[0] - 1.0);
1031 channel2_samples[2] = (float) ((stream.get_bits(channel2_codelength[0])) *
1032 channel2_factor[0] - 1.0);
1033 }
1034 return returnvalue;
1035 }
1036
1037 /**
1038 *
1039 */
1040 public boolean put_next_sample(int channels, SynthesisFilter filter1, SynthesisFilter filter2)
1041 {
1042 boolean returnvalue = super.put_next_sample(channels, filter1, filter2);
1043 if ((channel2_allocation != 0) && (channels != OutputChannels.LEFT_CHANNEL))
1044 {
1045 float sample = channel2_samples[samplenumber - 1];
1046
1047 if (groupingtable[1] == null)
1048 sample = (sample + channel2_d[0]) * channel2_c[0];
1049
1050 if (groupnumber <= 4)
1051 sample *= channel2_scalefactor1;
1052 else if (groupnumber <= 8)
1053 sample *= channel2_scalefactor2;
1054 else
1055 sample *= channel2_scalefactor3;
1056 if (channels == OutputChannels.BOTH_CHANNELS)
1057 filter2.input_sample(sample, subbandnumber);
1058 else
1059 filter1.input_sample(sample, subbandnumber);
1060 }
1061 return returnvalue;
1062 }
1063 }
1064}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-23 14:36:36 +0000