1 /*
   2  * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.media.sound;
  27 
  28 import java.io.IOException;
  29 import java.util.Objects;
  30 import java.util.Vector;
  31 
  32 import javax.sound.sampled.AudioFormat;

  33 import javax.sound.sampled.AudioInputStream;
  34 import javax.sound.sampled.AudioSystem;

  35 
  36 /**
  37  * U-law encodes linear data, and decodes u-law data to linear data.
  38  *
  39  * @author Kara Kytle
  40  */
  41 public final class UlawCodec extends SunCodec {
  42 
  43     /* Tables used for U-law decoding */
  44 
  45     private static final byte[] ULAW_TABH = new byte[256];
  46     private static final byte[] ULAW_TABL = new byte[256];
  47 
  48     private static final AudioFormat.Encoding[] ulawEncodings = {AudioFormat.Encoding.ULAW,
  49                                                                  AudioFormat.Encoding.PCM_SIGNED};
  50 
  51     private static final short seg_end [] = {0xFF, 0x1FF, 0x3FF,
  52                                              0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF};
  53 
  54     /**
  55      * Initializes the decode tables.
  56      */
  57     static {
  58         for (int i=0;i<256;i++) {
  59             int ulaw = ~i;
  60             int t;
  61 
  62             ulaw &= 0xFF;
  63             t = ((ulaw & 0xf)<<3) + 132;
  64             t <<= ((ulaw & 0x70) >> 4);
  65             t = ( (ulaw&0x80) != 0 ) ? (132-t) : (t-132);
  66 
  67             ULAW_TABL[i] = (byte) (t&0xff);
  68             ULAW_TABH[i] = (byte) ((t>>8) & 0xff);
  69         }
  70     }
  71 
  72     /**
  73      * Constructs a new ULAW codec object.
  74      */
  75     public UlawCodec() {
  76         super(ulawEncodings, ulawEncodings);



  77     }
  78 
  79     @Override
  80     public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){
  81         if( AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()) ) {
  82             if( sourceFormat.getSampleSizeInBits() == 16 ) {
  83                 AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
  84                 enc[0] = AudioFormat.Encoding.ULAW;
  85                 return enc;
  86             } else {
  87                 return new AudioFormat.Encoding[0];
  88             }
  89         } else if (AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding())) {
  90             if (sourceFormat.getSampleSizeInBits() == 8) {
  91                 AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
  92                 enc[0] = AudioFormat.Encoding.PCM_SIGNED;
  93                 return enc;
  94             } else {
  95                 return new AudioFormat.Encoding[0];
  96             }

   1 /*
   2  * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.media.sound;
  27 
  28 import java.io.IOException;
  29 import java.util.Objects;
  30 import java.util.Vector;
  31 
  32 import javax.sound.sampled.AudioFormat;
  33 import javax.sound.sampled.AudioFormat.Encoding;
  34 import javax.sound.sampled.AudioInputStream;
  35 import javax.sound.sampled.AudioSystem;
  36 import javax.sound.sampled.spi.FormatConversionProvider;
  37 
  38 /**
  39  * U-law encodes linear data, and decodes u-law data to linear data.
  40  *
  41  * @author Kara Kytle
  42  */
  43 public final class UlawCodec extends FormatConversionProvider {
  44 
  45     /* Tables used for U-law decoding */
  46 
  47     private static final byte[] ULAW_TABH = new byte[256];
  48     private static final byte[] ULAW_TABL = new byte[256];
  49 
  50     private static final short seg_end[] = {
  51             0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF
  52     };


  53 
  54     /**
  55      * Initializes the decode tables.
  56      */
  57     static {
  58         for (int i=0;i<256;i++) {
  59             int ulaw = ~i;
  60             int t;
  61 
  62             ulaw &= 0xFF;
  63             t = ((ulaw & 0xf)<<3) + 132;
  64             t <<= ((ulaw & 0x70) >> 4);
  65             t = ( (ulaw&0x80) != 0 ) ? (132-t) : (t-132);
  66 
  67             ULAW_TABL[i] = (byte) (t&0xff);
  68             ULAW_TABH[i] = (byte) ((t>>8) & 0xff);
  69         }
  70     }
  71 
  72     @Override
  73     public AudioFormat.Encoding[] getSourceEncodings() {
  74         return new Encoding[]{Encoding.ULAW, Encoding.PCM_SIGNED};
  75     }
  76 
  77     @Override
  78     public AudioFormat.Encoding[] getTargetEncodings() {
  79         return getSourceEncodings();
  80     }
  81 
  82     @Override
  83     public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){
  84         if( AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()) ) {
  85             if( sourceFormat.getSampleSizeInBits() == 16 ) {
  86                 AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
  87                 enc[0] = AudioFormat.Encoding.ULAW;
  88                 return enc;
  89             } else {
  90                 return new AudioFormat.Encoding[0];
  91             }
  92         } else if (AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding())) {
  93             if (sourceFormat.getSampleSizeInBits() == 8) {
  94                 AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
  95                 enc[0] = AudioFormat.Encoding.PCM_SIGNED;
  96                 return enc;
  97             } else {
  98                 return new AudioFormat.Encoding[0];
  99             }