audiofilereader.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

/*
 * @(#)AudioFileReader.java	1.16 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.sound.sampled.spi;

import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.net.URL;

import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.UnsupportedAudioFileException;

/**
 * Provider for audio file reading services.  Classes providing concrete
 * implementations can parse the format information from one or more types of
 * audio file, and can produce audio input streams from files of these types.
 *
 * @author Kara Kytle
 * @version 1.16 05/11/17
 * @since 1.3
 */
public abstract class AudioFileReader {
    
    /**
     * Obtains the audio file format of the input stream provided.  The stream must
     * point to valid audio file data.  In general, audio file readers 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 <code>IOException</code>.
     * @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 abstract AudioFileFormat getAudioFileFormat(InputStream stream) throws UnsupportedAudioFileException, IOException;
    
    /**
     * 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 abstract AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException;
    
    /**
     * Obtains the audio file format of the <code>File</code> provided.  The <code>File</code> must
     * point to valid audio file data.
     * @param file the <code>File</code> from which file format information should be
     * extracted
     * @return an <code>AudioFileFormat</code> object describing the audio file format
     * @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     */
    public abstract AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException;
    
    /**
     * Obtains an audio input stream from the input stream provided.  The stream must
     * point to valid audio file data.  In general, audio file readers 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 <code>IOException</code>.
     * @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 abstract AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException;
    
    /**
     * Obtains an audio input 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 abstract AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException;
    
    /**
     * Obtains an audio input stream from the <code>File</code> provided.  The <code>File</code> must
     * point to valid audio file data.
     * @param file the <code>File</code> 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 <code>File</code> does not point to valid audio
     * file data recognized by the system
     * @throws IOException if an I/O exception occurs
     */
    public abstract AudioInputStream getAudioInputStream(File file) throws UnsupportedAudioFileException, IOException;
}