/*
* AuTool.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 2000,2001 by Florian Bomers <http://www.bomers.de>
*
*
* 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.
*
*/
/*
|<--- this code is formatted to fit into 80 columns --->|
*/
package org.tritonus.sampled.file;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
/** Common constants and methods for handling au files.
*
* @author Florian Bomers
*/
public class AuTool {
public static final int AU_HEADER_MAGIC = 0x2e736e64;
public static final int AUDIO_UNKNOWN_SIZE = -1;
// length of header in bytes
public static final int DATA_OFFSET = 24;
public static final int SND_FORMAT_UNSPECIFIED = 0;
public static final int SND_FORMAT_MULAW_8 = 1;
public static final int SND_FORMAT_LINEAR_8 = 2;
public static final int SND_FORMAT_LINEAR_16 = 3;
public static final int SND_FORMAT_LINEAR_24 = 4;
public static final int SND_FORMAT_LINEAR_32 = 5;
public static final int SND_FORMAT_FLOAT = 6;
public static final int SND_FORMAT_DOUBLE = 7;
public static final int SND_FORMAT_ADPCM_G721 = 23;
public static final int SND_FORMAT_ADPCM_G722 = 24;
public static final int SND_FORMAT_ADPCM_G723_3 = 25;
public static final int SND_FORMAT_ADPCM_G723_5 = 26;
public static final int SND_FORMAT_ALAW_8 = 27;
public static int getFormatCode(AudioFormat format) {
// endianness is converted in audio output stream
// sign is converted for 8-bit files
AudioFormat.Encoding encoding = format.getEncoding();
int nSampleSize = format.getSampleSizeInBits();
// $$fb 2000-08-16: check the frame size, too.
boolean frameSizeOK=(format.getFrameSize()==AudioSystem.NOT_SPECIFIED
|| format.getChannels()!=AudioSystem.NOT_SPECIFIED
|| format.getFrameSize()==nSampleSize/8*format.getChannels());
boolean signed = encoding.equals(AudioFormat.Encoding.PCM_SIGNED);
boolean unsigned = encoding.equals(AudioFormat.Encoding.PCM_UNSIGNED);
if (encoding.equals(AudioFormat.Encoding.ULAW) && nSampleSize == 8 && frameSizeOK) {
return SND_FORMAT_MULAW_8;
} else if (nSampleSize == 8 && frameSizeOK && (signed || unsigned)) {
// support signed and unsigned PCM for 8 bit
return SND_FORMAT_LINEAR_8;
} else if (signed && frameSizeOK) {
// support only signed PCM for > 8 bit
if (nSampleSize == 16) {
return SND_FORMAT_LINEAR_16;
} else if (nSampleSize == 24) {
return SND_FORMAT_LINEAR_24;
} else if (nSampleSize == 32) {
return SND_FORMAT_LINEAR_32;
}
} else if (encoding.equals(AudioFormat.Encoding.ALAW) && nSampleSize == 8 && frameSizeOK) {
return SND_FORMAT_ALAW_8;
}
return SND_FORMAT_UNSPECIFIED;
}
}
/*** AuTool.java ***/