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/*
* WaveTool.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 2000 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.AudioSystem;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioFileFormat;
/**
* Common constants and methods for handling wave files.
*
* @author Florian Bomers
*/
public class WaveTool {
public static final int WAVE_RIFF_MAGIC = 0x52494646; // "RIFF"
public static final int WAVE_WAVE_MAGIC = 0x57415645; // "WAVE"
public static final int WAVE_FMT_MAGIC = 0x666D7420; // "fmt "
public static final int WAVE_DATA_MAGIC = 0x64617461; // "DATA"
public static final int WAVE_FACT_MAGIC = 0x66616374; // "fact"
public static final short WAVE_FORMAT_UNSPECIFIED = 0;
public static final short WAVE_FORMAT_PCM = 1;
public static final short WAVE_FORMAT_MS_ADPCM = 2;
public static final short WAVE_FORMAT_ALAW = 6;
public static final short WAVE_FORMAT_ULAW = 7;
public static final short WAVE_FORMAT_IMA_ADPCM = 17; // same as DVI_ADPCM
public static final short WAVE_FORMAT_G723_ADPCM = 20;
public static final short WAVE_FORMAT_GSM610 = 49;
public static final short WAVE_FORMAT_G721_ADPCM = 64;
public static final short WAVE_FORMAT_MPEG = 80;
public static final int MIN_FMT_CHUNK_LENGTH=14;
public static final int MIN_DATA_OFFSET=12+8+MIN_FMT_CHUNK_LENGTH+8;
public static final int MIN_FACT_CHUNK_LENGTH = 4;
// we always write the sample size in bits and the length of extra bytes.
// There are programs (CoolEdit) that rely on the
// additional entry for sample size in bits.
public static final int FMT_CHUNK_SIZE=18;
public static final int RIFF_CONTAINER_CHUNK_SIZE=12;
public static final int CHUNK_HEADER_SIZE=8;
public static final int DATA_OFFSET=RIFF_CONTAINER_CHUNK_SIZE
+CHUNK_HEADER_SIZE+FMT_CHUNK_SIZE+CHUNK_HEADER_SIZE;
public static AudioFormat.Encoding GSM0610 = new AudioFormat.Encoding("GSM0610");
public static AudioFormat.Encoding IMA_ADPCM = new AudioFormat.Encoding("IMA_ADPCM");
public static short getFormatCode(AudioFormat format) {
AudioFormat.Encoding encoding = format.getEncoding();
int nSampleSize = format.getSampleSizeInBits();
boolean littleEndian = !format.isBigEndian();
boolean frameSizeOK=format.getFrameSize()==AudioSystem.NOT_SPECIFIED
|| format.getChannels()!=AudioSystem.NOT_SPECIFIED
|| format.getFrameSize()==nSampleSize/8*format.getChannels();
if (nSampleSize==8 && frameSizeOK
&& (encoding.equals(AudioFormat.Encoding.PCM_SIGNED)
|| encoding.equals(AudioFormat.Encoding.PCM_UNSIGNED))) {
return WAVE_FORMAT_PCM;
} else if (nSampleSize>8 && frameSizeOK && littleEndian
&& encoding.equals(AudioFormat.Encoding.PCM_SIGNED)) {
return WAVE_FORMAT_PCM;
} else if (encoding.equals(AudioFormat.Encoding.ULAW)
&& (nSampleSize==AudioSystem.NOT_SPECIFIED || nSampleSize == 8)
&& frameSizeOK) {
return WAVE_FORMAT_ULAW;
} else if (encoding.equals(AudioFormat.Encoding.ALAW)
&& (nSampleSize==AudioSystem.NOT_SPECIFIED || nSampleSize == 8)
&& frameSizeOK) {
return WAVE_FORMAT_ALAW;
} else if (encoding.equals(new AudioFormat.Encoding("IMA_ADPCM"))
&& nSampleSize == 4)
{
return WAVE_FORMAT_IMA_ADPCM;
}
else if (encoding.equals(GSM0610)) {
return WAVE_FORMAT_GSM610;
}
return WAVE_FORMAT_UNSPECIFIED;
}
}
/*** WaveTool.java ***/
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