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    1   /*
    2    * Copyright (c) 2007, 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   package com.sun.media.sound;
   26   
   27   import java.util.Arrays;
   28   
   29   import javax.sound.sampled.AudioFormat;
   30   
   31   /**
   32    * This class is used to store audio buffer.
   33    *
   34    * @author Karl Helgason
   35    */
   36   public class SoftAudioBuffer {
   37   
   38       private int size;
   39       private float[] buffer;
   40       private boolean empty = true;
   41       private AudioFormat format;
   42       private AudioFloatConverter converter;
   43       private byte[] converter_buffer;
   44   
   45       public SoftAudioBuffer(int size, AudioFormat format) {
   46           this.size = size;
   47           this.format = format;
   48           converter = AudioFloatConverter.getConverter(format);
   49       }
   50   
   51       public void swap(SoftAudioBuffer swap)
   52       {
   53           int bak_size = size;
   54           float[] bak_buffer = buffer;
   55           boolean bak_empty = empty;
   56           AudioFormat bak_format = format;
   57           AudioFloatConverter bak_converter = converter;
   58           byte[] bak_converter_buffer = converter_buffer;
   59   
   60           size = swap.size;
   61           buffer = swap.buffer;
   62           empty = swap.empty;
   63           format = swap.format;
   64           converter = swap.converter;
   65           converter_buffer = swap.converter_buffer;
   66   
   67           swap.size = bak_size;
   68           swap.buffer = bak_buffer;
   69           swap.empty = bak_empty;
   70           swap.format = bak_format;
   71           swap.converter = bak_converter;
   72           swap.converter_buffer = bak_converter_buffer;
   73       }
   74   
   75       public AudioFormat getFormat() {
   76           return format;
   77       }
   78   
   79       public int getSize() {
   80           return size;
   81       }
   82   
   83       public void clear() {
   84           if (!empty) {
   85               Arrays.fill(buffer, 0);
   86               empty = true;
   87           }
   88       }
   89   
   90       public boolean isSilent() {
   91           return empty;
   92       }
   93   
   94       public float[] array() {
   95           empty = false;
   96           if (buffer == null)
   97               buffer = new float[size];
   98           return buffer;
   99       }
  100   
  101       public void get(byte[] buffer, int channel) {
  102   
  103           int framesize_pc = (format.getFrameSize() / format.getChannels());
  104           int c_len = size * framesize_pc;
  105           if (converter_buffer == null || converter_buffer.length < c_len)
  106               converter_buffer = new byte[c_len];
  107   
  108           if (format.getChannels() == 1) {
  109               converter.toByteArray(array(), size, buffer);
  110           } else {
  111               converter.toByteArray(array(), size, converter_buffer);
  112               if (channel >= format.getChannels())
  113                   return;
  114               int z_stepover = format.getChannels() * framesize_pc;
  115               int k_stepover = framesize_pc;
  116               for (int j = 0; j < framesize_pc; j++) {
  117                   int k = j;
  118                   int z = channel * framesize_pc + j;
  119                   for (int i = 0; i < size; i++) {
  120                       buffer[z] = converter_buffer[k];
  121                       z += z_stepover;
  122                       k += k_stepover;
  123                   }
  124               }
  125           }
  126   
  127       }
  128   }

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