sampled/spi/AudioFileWriter.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package javax.sound.sampled.spi;

import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

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


/**
 * Provider for audio file writing services.  Classes providing concrete
 * implementations can write one or more types of audio file from an audio
 * stream.
 *
 * @author Kara Kytle
 * @since 1.3
 */
public abstract class AudioFileWriter {

    /**
     * Obtains the file types for which file writing support is provided by this
     * audio file writer.
     * @return array of file types.  If no file types are supported,
     * an array of length 0 is returned.
     */
    public abstract AudioFileFormat.Type[] getAudioFileTypes();


    /**
     * Indicates whether file writing support for the specified file type is provided
     * by this audio file writer.
     * @param fileType the file type for which write capabilities are queried
     * @return <code>true</code> if the file type is supported,
     * otherwise <code>false</code>
     */
    public boolean isFileTypeSupported(AudioFileFormat.Type fileType) {

        AudioFileFormat.Type types[] = getAudioFileTypes();

        for(int i=0; i<types.length; i++) {
            if( fileType.equals( types[i] ) ) {
                return true;
            }
        }
        return false;
    }


    /**
     * Obtains the file types that this audio file writer can write from the
     * audio input stream specified.
     * @param stream the audio input stream for which audio file type support
     * is queried
     * @return array of file types.  If no file types are supported,
     * an array of length 0 is returned.
     */
    public abstract AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream);


    /**
     * Indicates whether an audio file of the type specified can be written
     * from the audio input stream indicated.
     * @param fileType file type for which write capabilities are queried
     * @param stream for which file writing support is queried
     * @return <code>true</code> if the file type is supported for this audio input stream,
     * otherwise <code>false</code>
     */
    public boolean isFileTypeSupported(AudioFileFormat.Type fileType, AudioInputStream stream) {

        AudioFileFormat.Type types[] = getAudioFileTypes( stream );

        for(int i=0; i<types.length; i++) {
            if( fileType.equals( types[i] ) ) {
                return true;
            }
        }
        return false;
    }


    /**
     * Writes a stream of bytes representing an audio file of the file type
     * indicated to the output stream provided.  Some file types require that
     * the length be written into the file header, and cannot be written from
     * start to finish unless the length is known in advance.  An attempt
     * to write such a file type will fail with an IOException if the length in
     * the audio file format is
     * {@link javax.sound.sampled.AudioSystem#NOT_SPECIFIED AudioSystem.NOT_SPECIFIED}.
     * @param stream the audio input stream containing audio data to be
     * written to the output stream
     * @param fileType file type to be written to the output stream
     * @param out stream to which the file data should be written
     * @return the number of bytes written to the output stream
     * @throws IOException if an I/O exception occurs
     * @throws IllegalArgumentException if the file type is not supported by
     * the system
     * @see #isFileTypeSupported(AudioFileFormat.Type, AudioInputStream)
     * @see #getAudioFileTypes
     */
    public abstract int write(AudioInputStream stream, AudioFileFormat.Type fileType, OutputStream out) throws IOException;


    /**
     * Writes a stream of bytes representing an audio file of the file format
     * indicated to the external file provided.
     * @param stream the audio input stream containing audio data to be
     * written to the file
     * @param fileType file type to be written to the file
     * @param out external file to which the file data should be written
     * @return the number of bytes written to the file
     * @throws IOException if an I/O exception occurs
     * @throws IllegalArgumentException if the file format is not supported by
     * the system
     * @see #isFileTypeSupported
     * @see #getAudioFileTypes
     */
    public abstract int write(AudioInputStream stream, AudioFileFormat.Type fileType, File out) throws IOException;


}