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/*
* AuAudioFileReader.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 1999,2000,2001 by Florian Bomers <http://www.bomers.de>
* Copyright (c) 1999 by Matthias Pfisterer
*
*
* 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 java.io.DataInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.sound.sampled.spi.AudioFileReader;
import org.tritonus.share.TDebug;
import org.tritonus.share.sampled.file.TAudioFileFormat;
import org.tritonus.share.sampled.file.TAudioFileReader;
/** Class for reading Sun/Next AU files.
*
* @author Florian Bomers
* @author Matthias Pfisterer
*/
public class AuAudioFileReader extends TAudioFileReader
{
private static final int READ_LIMIT = 1000;
public AuAudioFileReader()
{
super(READ_LIMIT);
}
private static String readDescription(DataInputStream dis, int len) throws IOException {
byte c=-1;
String ret="";
while (len>0 && (c=dis.readByte())!=0) {
ret=ret+(char) c;
len--;
}
if (len>1 && c==0) {
dis.skip(len-1);
}
return ret;
}
protected AudioFileFormat getAudioFileFormat(InputStream inputStream, long lFileSizeInBytes)
throws UnsupportedAudioFileException, IOException
{
if (TDebug.TraceAudioFileReader) {TDebug.out("AuAudioFileReader.getAudioFileFormat(InputStream, long): begin"); }
DataInputStream dataInputStream = new DataInputStream(inputStream);
int nMagic = dataInputStream.readInt();
if (nMagic != AuTool.AU_HEADER_MAGIC) {
throw new UnsupportedAudioFileException(
"not an AU file: wrong header magic");
}
int nDataOffset = dataInputStream.readInt();
if (TDebug.TraceAudioFileReader) {
TDebug.out("AuAudioFileReader.getAudioFileFormat(): data offset: " + nDataOffset);
}
if (nDataOffset < AuTool.DATA_OFFSET) {
throw new UnsupportedAudioFileException(
"not an AU file: data offset must be 24 or greater");
}
int nDataLength = dataInputStream.readInt();
if (TDebug.TraceAudioFileReader) {
TDebug.out("AuAudioFileReader.getAudioFileFormat(): data length: " + nDataLength);
}
if (nDataLength < 0 && nDataLength!=AuTool.AUDIO_UNKNOWN_SIZE) {
throw new UnsupportedAudioFileException(
"not an AU file: data length must be positive, 0 or -1 for unknown");
}
AudioFormat.Encoding encoding = null;
int nSampleSize = 0;
int nEncoding = dataInputStream.readInt();
switch (nEncoding) {
case AuTool.SND_FORMAT_MULAW_8: // 8-bit uLaw G.711
encoding = AudioFormat.Encoding.ULAW;
nSampleSize = 8;
break;
case AuTool.SND_FORMAT_LINEAR_8:
encoding = AudioFormat.Encoding.PCM_SIGNED;
nSampleSize = 8;
break;
case AuTool.SND_FORMAT_LINEAR_16:
encoding = AudioFormat.Encoding.PCM_SIGNED;
nSampleSize = 16;
break;
case AuTool.SND_FORMAT_LINEAR_24:
encoding = AudioFormat.Encoding.PCM_SIGNED;
nSampleSize = 24;
break;
case AuTool.SND_FORMAT_LINEAR_32:
encoding = AudioFormat.Encoding.PCM_SIGNED;
nSampleSize = 32;
break;
case AuTool.SND_FORMAT_ALAW_8: // 8-bit aLaw G.711
encoding = AudioFormat.Encoding.ALAW;
nSampleSize = 8;
break;
}
if (nSampleSize == 0) {
throw new UnsupportedAudioFileException(
"unsupported AU file: unknown encoding " + nEncoding);
}
int nSampleRate = dataInputStream.readInt();
if (nSampleRate <= 0) {
throw new UnsupportedAudioFileException(
"corrupt AU file: sample rate must be positive");
}
int nNumChannels = dataInputStream.readInt();
if (nNumChannels <= 0) {
throw new UnsupportedAudioFileException(
"corrupt AU file: number of channels must be positive");
}
// skip header information field
inputStream.skip(nDataOffset - AuTool.DATA_OFFSET);
// read header info field
//String desc=readDescription(dataInputStream, nDataOffset - AuTool.DATA_OFFSET);
AudioFormat format = new AudioFormat(encoding,
(float) nSampleRate,
nSampleSize,
nNumChannels,
calculateFrameSize(nSampleSize, nNumChannels),
(float) nSampleRate,
true);
AudioFileFormat audioFileFormat = new TAudioFileFormat(
AudioFileFormat.Type.AU,
format,
(nDataLength==AuTool.AUDIO_UNKNOWN_SIZE)?
AudioSystem.NOT_SPECIFIED:(nDataLength / format.getFrameSize()),
(nDataLength==AuTool.AUDIO_UNKNOWN_SIZE)?
AudioSystem.NOT_SPECIFIED:(nDataLength + nDataOffset));
if (TDebug.TraceAudioFileReader) { TDebug.out("AuAudioFileReader.getAudioFileFormat(InputStream, long): begin"); }
return audioFileFormat;
}
}
/*** AuAudioFileReader.java ***/
|
