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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 {
Constructs a new AuFileReader object.
/** * Constructs a new AuFileReader object. */
public AuFileReader() { } // 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:
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; int sampleSizeInBits = 0; 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; 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:
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:
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:
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:
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:
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; } }