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package com.sun.media.sound;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
AU file reader.
Author: Kara Kytle, Jan Borgersen, Florian Bomers
/**
* AU file reader.
*
* @author Kara Kytle
* @author Jan Borgersen
* @author Florian Bomers
*/
public final class AuFileReader extends SunFileReader {
// METHODS TO IMPLEMENT AudioFileReader
Obtains the audio file format of the input stream provided. The stream must
point to valid audio file data. In general, audio file providers may
need to read some data from the stream before determining whether they
support it. These parsers must
be able to mark the stream, read enough data to determine whether they
support the stream, and, if not, reset the stream's read pointer to its original
position. If the input stream does not support this, this method may fail
with an IOException.
Params: - stream – the input stream from which file format information should be
extracted
Throws: - UnsupportedAudioFileException – if the stream does not point to valid audio
file data recognized by the system
- IOException – if an I/O exception occurs
See Also: Returns: an AudioFileFormat object describing the audio file format
/**
* Obtains the audio file format of the input stream provided. The stream must
* point to valid audio file data. In general, audio file providers may
* need to read some data from the stream before determining whether they
* support it. These parsers must
* be able to mark the stream, read enough data to determine whether they
* support the stream, and, if not, reset the stream's read pointer to its original
* position. If the input stream does not support this, this method may fail
* with an IOException.
* @param stream the input stream from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the stream does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
* @see InputStream#markSupported
* @see InputStream#mark
*/
public AudioFileFormat getAudioFileFormat(InputStream stream) throws UnsupportedAudioFileException, IOException {
AudioFormat format = null;
AuFileFormat fileFormat = null;
int maxReadLength = 28;
boolean bigendian = false;
int magic = -1;
int headerSize = -1;
int dataSize = -1;
int encoding_local = -1;
int sampleRate = -1;
int frameRate = -1;
int frameSize = -1;
int channels = -1;
final int sampleSizeInBits;
int length = 0;
int nread = 0;
AudioFormat.Encoding encoding = null;
DataInputStream dis = new DataInputStream( stream );
dis.mark(maxReadLength);
magic = dis.readInt();
if (! (magic == AuFileFormat.AU_SUN_MAGIC) || (magic == AuFileFormat.AU_DEC_MAGIC) ||
(magic == AuFileFormat.AU_SUN_INV_MAGIC) || (magic == AuFileFormat.AU_DEC_INV_MAGIC) ) {
// not AU, reset the stream, place into exception, throw exception
dis.reset();
throw new UnsupportedAudioFileException("not an AU file");
}
if ((magic == AuFileFormat.AU_SUN_MAGIC) || (magic == AuFileFormat.AU_DEC_MAGIC)) {
bigendian = true; // otherwise little-endian
}
headerSize = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
dataSize = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
encoding_local = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
sampleRate = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
channels = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
if (channels <= 0) {
dis.reset();
throw new UnsupportedAudioFileException("Invalid number of channels");
}
frameRate = sampleRate;
switch (encoding_local) {
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:
// $$jb: 04.29.99: 8bit linear is *signed*, not *unsigned*
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 8;
break;
case AuFileFormat.AU_LINEAR_16:
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 16;
break;
case AuFileFormat.AU_LINEAR_24:
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 24;
break;
case AuFileFormat.AU_LINEAR_32:
encoding = AudioFormat.Encoding.PCM_SIGNED;
sampleSizeInBits = 32;
break;
// $jb: 03.19.99: we don't support these ...
/* case AuFileFormat.AU_FLOAT:
encoding = new AudioFormat.FLOAT;
sampleSizeInBits = 32;
break;
case AuFileFormat.AU_DOUBLE:
encoding = new AudioFormat.DOUBLE;
sampleSizeInBits = 8;
break;
case AuFileFormat.AU_ADPCM_G721:
encoding = new AudioFormat.G721_ADPCM;
sampleSizeInBits = 16;
break;
case AuFileFormat.AU_ADPCM_G723_3:
encoding = new AudioFormat.G723_3;
sampleSize = 24;
SamplePerUnit = 8;
break;
case AuFileFormat.AU_ADPCM_G723_5:
encoding = new AudioFormat.G723_5;
sampleSize = 40;
SamplePerUnit = 8;
break;
*/
default:
// unsupported filetype, throw exception
dis.reset();
throw new UnsupportedAudioFileException("not a valid AU file");
}
frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);
//$$fb 2002-11-02: fix for 4629669: AU file reader: problems with empty files
if( dataSize < 0 ) {
length = AudioSystem.NOT_SPECIFIED;
} else {
//$$fb 2003-10-20: fix for 4940459: AudioInputStream.getFrameLength() returns 0 instead of NOT_SPECIFIED
length = dataSize / frameSize;
}
format = new AudioFormat( encoding, (float)sampleRate, sampleSizeInBits,
channels, frameSize, (float)frameRate, bigendian);
fileFormat = new AuFileFormat( AudioFileFormat.Type.AU, dataSize+headerSize,
format, length);
dis.reset(); // Throws IOException
return fileFormat;
}
Obtains the audio file format of the URL provided. The URL must
point to valid audio file data.
Params: - url – the URL from which file format information should be
extracted
Throws: - UnsupportedAudioFileException – if the URL does not point to valid audio
file data recognized by the system
- IOException – if an I/O exception occurs
Returns: an AudioFileFormat object describing the audio file format
/**
* Obtains the audio file format of the URL provided. The URL must
* point to valid audio file data.
* @param url the URL from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the URL does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException {
InputStream urlStream = null;
BufferedInputStream bis = null;
AudioFileFormat fileFormat = null;
AudioFormat format = null;
urlStream = url.openStream(); // throws IOException
try {
bis = new BufferedInputStream( urlStream, bisBufferSize );
fileFormat = getAudioFileFormat( bis ); // throws UnsupportedAudioFileException
} finally {
urlStream.close();
}
return fileFormat;
}
Obtains the audio file format of the File provided. The File must
point to valid audio file data.
Params: - file – the File from which file format information should be
extracted
Throws: - UnsupportedAudioFileException – if the File does not point to valid audio
file data recognized by the system
- IOException – if an I/O exception occurs
Returns: an AudioFileFormat object describing the audio file format
/**
* Obtains the audio file format of the File provided. The File must
* point to valid audio file data.
* @param file the File from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the File does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException {
FileInputStream fis = null;
BufferedInputStream bis = null;
AudioFileFormat fileFormat = null;
AudioFormat format = null;
fis = new FileInputStream( file ); // throws IOException
// part of fix for 4325421
try {
bis = new BufferedInputStream( fis, bisBufferSize );
fileFormat = getAudioFileFormat( bis ); // throws UnsupportedAudioFileException
} finally {
fis.close();
}
return fileFormat;
}
Obtains an audio stream from the input stream provided. The stream must
point to valid audio file data. In general, audio file providers may
need to read some data from the stream before determining whether they
support it. These parsers must
be able to mark the stream, read enough data to determine whether they
support the stream, and, if not, reset the stream's read pointer to its original
position. If the input stream does not support this, this method may fail
with an IOException.
Params: - stream – the input stream from which the
AudioInputStream should be
constructed
Throws: - UnsupportedAudioFileException – if the stream does not point to valid audio
file data recognized by the system
- IOException – if an I/O exception occurs
See Also: Returns: an AudioInputStream object based on the audio file data contained
in the input stream.
/**
* Obtains an audio stream from the input stream provided. The stream must
* point to valid audio file data. In general, audio file providers may
* need to read some data from the stream before determining whether they
* support it. These parsers must
* be able to mark the stream, read enough data to determine whether they
* support the stream, and, if not, reset the stream's read pointer to its original
* position. If the input stream does not support this, this method may fail
* with an IOException.
* @param stream the input stream from which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data contained
* in the input stream.
* @throws UnsupportedAudioFileException if the stream does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
* @see InputStream#markSupported
* @see InputStream#mark
*/
public AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException {
DataInputStream dis = null;
int headerSize;
AudioFileFormat fileFormat = null;
AudioFormat format = null;
fileFormat = getAudioFileFormat( stream ); // throws UnsupportedAudioFileException, IOException
// if we passed this call, we have an AU file.
format = fileFormat.getFormat();
dis = new DataInputStream(stream);
// now seek past the header
dis.readInt(); // magic
headerSize = (format.isBigEndian()==true ? dis.readInt() : rllong(dis) );
dis.skipBytes( headerSize - 8 );
// we've got everything, and the stream should be at the
// beginning of the data chunk, so return an AudioInputStream.
return new AudioInputStream(dis, format, fileFormat.getFrameLength());
}
Obtains an audio stream from the URL provided. The URL must
point to valid audio file data.
Params: - url – the URL for which the
AudioInputStream should be
constructed
Throws: - UnsupportedAudioFileException – if the URL does not point to valid audio
file data recognized by the system
- IOException – if an I/O exception occurs
Returns: an AudioInputStream object based on the audio file data pointed
to by the URL
/**
* Obtains an audio stream from the URL provided. The URL must
* point to valid audio file data.
* @param url the URL for which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data pointed
* to by the URL
* @throws UnsupportedAudioFileException if the URL does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException {
InputStream urlStream = null;
BufferedInputStream bis = null;
AudioFileFormat fileFormat = null;
urlStream = url.openStream(); // throws IOException
AudioInputStream result = null;
try {
bis = new BufferedInputStream( urlStream, bisBufferSize );
result = getAudioInputStream( (InputStream)bis );
} finally {
if (result == null) {
urlStream.close();
}
}
return result;
}
Obtains an audio stream from the File provided. The File must
point to valid audio file data.
Params: - file – the File for which the
AudioInputStream should be
constructed
Throws: - UnsupportedAudioFileException – if the File does not point to valid audio
file data recognized by the system
- IOException – if an I/O exception occurs
Returns: an AudioInputStream object based on the audio file data pointed
to by the File
/**
* Obtains an audio stream from the File provided. The File must
* point to valid audio file data.
* @param file the File for which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data pointed
* to by the File
* @throws UnsupportedAudioFileException if the File does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioInputStream getAudioInputStream(File file) throws UnsupportedAudioFileException, IOException {
FileInputStream fis = null;
BufferedInputStream bis = null;
AudioFileFormat fileFormat = null;
fis = new FileInputStream( file ); // throws IOException
AudioInputStream result = null;
// part of fix for 4325421
try {
bis = new BufferedInputStream( fis, bisBufferSize );
result = getAudioInputStream( (InputStream)bis );
} finally {
if (result == null) {
fis.close();
}
}
return result;
}
}