/*
* 11/19/04 1.0 moved to LGPL.
* 12/12/99 Added appendSamples() method for efficiency. MDM.
* 15/02/99 ,Java Conversion by E.B ,ebsp@iname.com, JavaLayer
*
* Declarations for output buffer, includes operating system
* implementation of the virtual Obuffer. Optional routines
* enabling seeks and stops added by Jeff Tsay.
*
* @(#) obuffer.h 1.8, last edit: 6/15/94 16:51:56
* @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
* @(#) Berlin University of Technology
*
* Idea and first implementation for u-law output with fast downsampling by
* Jim Boucher (jboucher@flash.bu.edu)
*
* LinuxObuffer class written by
* Louis P. Kruger (lpkruger@phoenix.princeton.edu)
*-----------------------------------------------------------------------
* 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 audio.javazoom.jl.decoder;
/**
* Base Class for audio output.
*/
public abstract class Obuffer
{
public static final int OBUFFERSIZE = 2 * 1152; // max. 2 * 1152 samples per frame
public static final int MAXCHANNELS = 2; // max. number of channels
/**
* Takes a 16 Bit PCM sample.
*/
public abstract void append(int channel, short value);
/**
* Accepts 32 new PCM samples.
*/
public void appendSamples(int channel, float[] f)
{
short s;
for (int i=0; i<32;)
{
s = clip(f[i++]);
append(channel, s);
}
}
/**
* Clip Sample to 16 Bits
*/
private final short clip(float sample)
{
return ((sample > 32767.0f) ? 32767 :
((sample < -32768.0f) ? -32768 :
(short) sample));
}
/**
* Write the samples to the file or directly to the audio hardware.
*/
public abstract void write_buffer(int val);
public abstract void close();
/**
* Clears all data in the buffer (for seeking).
*/
public abstract void clear_buffer();
/**
* Notify the buffer that the user has stopped the stream.
*/
public abstract void set_stop_flag();
}