26 package com.sun.media.sound;
27
28 import java.io.IOException;
29
30 import java.util.Vector;
31
32 import javax.sound.sampled.AudioFormat;
33 import javax.sound.sampled.AudioSystem;
34 import javax.sound.sampled.AudioInputStream;
35
36
37 /**
38 * U-law encodes linear data, and decodes u-law data to linear data.
39 *
40 * @author Kara Kytle
41 */
42 public final class UlawCodec extends SunCodec {
43
44 /* Tables used for U-law decoding */
45
46 private final static byte[] ULAW_TABH = new byte[256];
47 private final static byte[] ULAW_TABL = new byte[256];
48
49 private static final AudioFormat.Encoding[] ulawEncodings = {AudioFormat.Encoding.ULAW,
50 AudioFormat.Encoding.PCM_SIGNED};
51
52 private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF,
53 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF};
54
55 /**
56 * Initializes the decode tables
57 */
58 static {
59 for (int i=0;i<256;i++) {
60 int ulaw = ~i;
61 int t;
62
63 ulaw &= 0xFF;
64 t = ((ulaw & 0xf)<<3) + 132;
65 t <<= ((ulaw & 0x70) >> 4);
66 t = ( (ulaw&0x80) != 0 ) ? (132-t) : (t-132);
67
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26 package com.sun.media.sound;
27
28 import java.io.IOException;
29
30 import java.util.Vector;
31
32 import javax.sound.sampled.AudioFormat;
33 import javax.sound.sampled.AudioSystem;
34 import javax.sound.sampled.AudioInputStream;
35
36
37 /**
38 * U-law encodes linear data, and decodes u-law data to linear data.
39 *
40 * @author Kara Kytle
41 */
42 public final class UlawCodec extends SunCodec {
43
44 /* Tables used for U-law decoding */
45
46 private static final byte[] ULAW_TABH = new byte[256];
47 private static final byte[] ULAW_TABL = new byte[256];
48
49 private static final AudioFormat.Encoding[] ulawEncodings = {AudioFormat.Encoding.ULAW,
50 AudioFormat.Encoding.PCM_SIGNED};
51
52 private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF,
53 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF};
54
55 /**
56 * Initializes the decode tables
57 */
58 static {
59 for (int i=0;i<256;i++) {
60 int ulaw = ~i;
61 int t;
62
63 ulaw &= 0xFF;
64 t = ((ulaw & 0xf)<<3) + 132;
65 t <<= ((ulaw & 0x70) >> 4);
66 t = ( (ulaw&0x80) != 0 ) ? (132-t) : (t-132);
67
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