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SampleBuffer.java

/* 
 * 11/19/04  1.0 moved to LGPL.
 * 
 * 12/12/99  Initial Version based on FileObuffer.    mdm@techie.com.
 * 
 * FileObuffer:
 * 15/02/99  Java Conversion by E.B ,javalayer@javazoom.net
 *
 *-----------------------------------------------------------------------
 *   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;

/**
 * The <code>SampleBuffer</code> class implements an output buffer
 * that provides storage for a fixed size block of samples. 
 */
00032 public class SampleBuffer extends Obuffer
{
  private short[]             buffer;
  private int[]         bufferp;
  private int                 channels;
  private int                 frequency;
  
  /**
   * Constructor
   */
00042   public SampleBuffer(int sample_frequency, int number_of_channels)
  {
      buffer = new short[OBUFFERSIZE];
      bufferp = new int[MAXCHANNELS];
      channels = number_of_channels;
      frequency = sample_frequency;
      
      for (int i = 0; i < number_of_channels; ++i) 
            bufferp[i] = (short)i;
      
  }

  public int getChannelCount()
  {
      return this.channels;  
  }
  
  public int getSampleFrequency()
  {
        return this.frequency;
  }
  
  public short[] getBuffer()
  {
      return this.buffer;  
  }
  
  public int getBufferLength()
  {
        return bufferp[0];
  }
  
  /**
   * Takes a 16 Bit PCM sample.
   */
00077   public void append(int channel, short value)
  {
      buffer[bufferp[channel]] = value;
      bufferp[channel] += channels;       
  }
  
00083       public void appendSamples(int channel, float[] f)
      {
          int pos = bufferp[channel];
            
            short s;
            float fs;
          for (int i=0; i<32;)
          {
                  fs = f[i++];
                  fs = (fs>32767.0f ? 32767.0f 
                                       : (fs < -32767.0f ? -32767.0f : fs));
                  
                  s = (short)fs;
                  buffer[pos] = s;
                  pos += channels;
          }
            
            bufferp[channel] = pos;
      }
  
  
  /**
   * Write the samples to the file (Random Acces).
   */
00107   public void write_buffer(int val)
  {
                          
      //for (int i = 0; i < channels; ++i) 
      //    bufferp[i] = (short)i;

  }

  public void close()
  {}
  
  /**
   *
   */
00121   public void clear_buffer()
  {
      for (int i = 0; i < channels; ++i) 
            bufferp[i] = (short)i;
  }

  /**
   *
   */
00130   public void set_stop_flag()
  {}
}

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