89 lines
2.7 KiB
Java
89 lines
2.7 KiB
Java
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/*
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* 11/19/04 1.0 moved to LGPL.
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* 12/12/99 Added appendSamples() method for efficiency. MDM.
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* 15/02/99 ,Java Conversion by E.B ,ebsp@iname.com, JavaLayer
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*
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* Declarations for output buffer, includes operating system
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* implementation of the virtual Obuffer. Optional routines
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* enabling seeks and stops added by Jeff Tsay.
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*
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* @(#) obuffer.h 1.8, last edit: 6/15/94 16:51:56
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* @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
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* @(#) Berlin University of Technology
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*
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* Idea and first implementation for u-law output with fast downsampling by
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* Jim Boucher (jboucher@flash.bu.edu)
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*
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* LinuxObuffer class written by
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* Louis P. Kruger (lpkruger@phoenix.princeton.edu)
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*-----------------------------------------------------------------------
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*----------------------------------------------------------------------
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*/
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package javazoom.jl.decoder;
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/**
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* Base Class for audio output.
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*/
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public abstract class Obuffer
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{
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public static final int OBUFFERSIZE = 2 * 1152; // max. 2 * 1152 samples per frame
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public static final int MAXCHANNELS = 2; // max. number of channels
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/**
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* Takes a 16 Bit PCM sample.
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*/
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public abstract void append(int channel, short value);
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/**
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* Accepts 32 new PCM samples.
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*/
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public void appendSamples(int channel, float[] f)
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{
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short s;
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for (int i=0; i<32;)
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{
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s = clip(f[i++]);
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append(channel, s);
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}
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}
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/**
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* Clip Sample to 16 Bits
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*/
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private final short clip(float sample)
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{
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return ((sample > 32767.0f) ? 32767 :
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((sample < -32768.0f) ? -32768 :
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(short) sample));
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}
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/**
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* Write the samples to the file or directly to the audio hardware.
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*/
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public abstract void write_buffer(int val);
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public abstract void close();
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/**
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* Clears all data in the buffer (for seeking).
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*/
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public abstract void clear_buffer();
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/**
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* Notify the buffer that the user has stopped the stream.
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*/
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public abstract void set_stop_flag();
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}
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