/*
* Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.media.sound;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.sound.sampled.AudioFileFormat.Type;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
/**
* AU file reader.
*
* @author Kara Kytle
* @author Jan Borgersen
* @author Florian Bomers
*/
public final class AuFileReader extends SunFileReader {
@Override
StandardFileFormat getAudioFileFormatImpl(final InputStream stream)
throws UnsupportedAudioFileException, IOException {
final DataInputStream dis = new DataInputStream(stream);
final int magic = dis.readInt();
if (magic != AuFileFormat.AU_SUN_MAGIC) {
// not AU, throw exception
throw new UnsupportedAudioFileException("not an AU file");
}
final int headerSize = dis.readInt();
if (headerSize < AuFileFormat.AU_HEADERSIZE) {
throw new UnsupportedAudioFileException("Invalid header size");
}
final long /* unsigned int */ dataSize = dis.readInt() & 0xffffffffL;
final int auType = dis.readInt();
final int sampleRate = dis.readInt();
if (sampleRate <= 0) {
throw new UnsupportedAudioFileException("Invalid sample rate");
}
final int channels = dis.readInt();
if (channels <= 0) {
throw new UnsupportedAudioFileException("Invalid number of channels");
}
final int sampleSizeInBits;
final AudioFormat.Encoding encoding;
switch (auType) {
case AuFileFormat.AU_ULAW_8:
encoding = AudioFormat.Encoding.ULAW;
sampleSizeInBits = 8;
break;
case AuFileFormat.AU_ALAW_8:
encoding = AudioFormat.Encoding.ALAW;
sampleSizeInBits = 8;
break;
case AuFileFormat.AU_LINEAR_8:
// $$jb: 04.29.99: 8bit linear is *signed*, not *unsigned*
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 8;
break;
case AuFileFormat.AU_LINEAR_16:
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 16;
break;
case AuFileFormat.AU_LINEAR_24:
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 24;
break;
case AuFileFormat.AU_LINEAR_32:
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 32;
break;
case AuFileFormat.AU_FLOAT:
encoding = AudioFormat.Encoding.PCM_FLOAT;
sampleSizeInBits = 32;
break;
// we don't support these ...
/* case AuFileFormat.AU_DOUBLE:
encoding = new AudioFormat.DOUBLE;
sampleSizeInBits = 8;
break;
case AuFileFormat.AU_ADPCM_G721:
encoding = new AudioFormat.G721_ADPCM;
sampleSizeInBits = 16;
break;
case AuFileFormat.AU_ADPCM_G723_3:
encoding = new AudioFormat.G723_3;
sampleSize = 24;
SamplePerUnit = 8;
break;
case AuFileFormat.AU_ADPCM_G723_5:
encoding = new AudioFormat.G723_5;
sampleSize = 40;
SamplePerUnit = 8;
break;
*/
default:
// unsupported filetype, throw exception
throw new UnsupportedAudioFileException("not a valid AU file");
}
// Skip the variable-length annotation field. The content of this field
// is currently undefined by AU specification and is unsupported by
// JavaSound, so seek past the header
dis.skipBytes(headerSize - AuFileFormat.AU_HEADERSIZE);
// Even if the sampleSizeInBits and channels are supported we can get an
// unsupported frameSize because of overflow
final int frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);
if (frameSize <= 0) {
throw new UnsupportedAudioFileException("Invalid frame size");
}
//$$fb 2002-11-02: fix for 4629669: AU file reader: problems with empty files
//$$fb 2003-10-20: fix for 4940459: AudioInputStream.getFrameLength() returns 0 instead of NOT_SPECIFIED
long frameLength = AudioSystem.NOT_SPECIFIED;
long byteLength = AudioSystem.NOT_SPECIFIED;
if (dataSize != AuFileFormat.UNKNOWN_SIZE) {
frameLength = dataSize / frameSize;
byteLength = dataSize + headerSize;
}
final AudioFormat format = new AudioFormat(encoding, sampleRate,
sampleSizeInBits, channels,
frameSize, sampleRate, true);
return new AuFileFormat(Type.AU, byteLength, format, frameLength);
}
}