/* * Copyright (c) 1999, 2007, 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.media.sound; import java.io.File;import java.io.InputStream;import java.io.OutputStream;import java.io.IOException;import java.io.DataInputStream;import java.net.URL; import javax.sound.sampled.AudioFileFormat;import javax.sound.sampled.AudioInputStream;import javax.sound.sampled.UnsupportedAudioFileException;import javax.sound.sampled.spi.AudioFileReader;   /** * Abstract File Reader class. * * @author Jan Borgersen */abstract class SunFileReader extends AudioFileReader {     // buffer size for temporary input streams    protected static final int bisBufferSize = 4096;     /**     * Constructs a new SunFileReader object.     */    public 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.     * @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     */    abstract public 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     */    abstract public AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException;      /**     * 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     */    abstract public AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException;      /**     * 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     */    abstract public AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException;      /**     * 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     */    abstract public AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException;      /**     * 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     */    abstract public AudioInputStream getAudioInputStream(File file) throws UnsupportedAudioFileException, IOException;      // HELPER METHODS       /**     * rllong     * Protected helper method to read 64 bits and changing the order of     * each bytes.     * @param DataInputStream     * @return 32 bits swapped value.     * @exception IOException     */    protected int rllong(DataInputStream dis) throws IOException {         int b1, b2, b3, b4 ;        int i = 0;         i = dis.readInt();         b1 = ( i & 0xFF ) << 24 ;        b2 = ( i & 0xFF00 ) << 8;        b3 = ( i & 0xFF0000 ) >> 8;        b4 = ( i & 0xFF000000 ) >>> 24;         i = ( b1 | b2 | b3 | b4 );         return i;    }     /**     * big2little     * Protected helper method to swap the order of bytes in a 32 bit int     * @param int     * @return 32 bits swapped value     */    protected int big2little(int i) {         int b1, b2, b3, b4 ;         b1 = ( i & 0xFF ) << 24 ;        b2 = ( i & 0xFF00 ) << 8;        b3 = ( i & 0xFF0000 ) >> 8;        b4 = ( i & 0xFF000000 ) >>> 24;         i = ( b1 | b2 | b3 | b4 );         return i;    }     /**     * rlshort     * Protected helper method to read 16 bits value. Swap high with low byte.     * @param DataInputStream     * @return the swapped value.     * @exception IOException     */    protected short rlshort(DataInputStream dis)  throws IOException {         short s=0;        short high, low;         s = dis.readShort();         high = (short)(( s & 0xFF ) << 8) ;        low = (short)(( s & 0xFF00 ) >>> 8);         s = (short)( high | low );         return s;    }     /**     * big2little     * Protected helper method to swap the order of bytes in a 16 bit short     * @param int     * @return 16 bits swapped value     */    protected short big2littleShort(short i) {         short high, low;         high = (short)(( i & 0xFF ) << 8) ;        low = (short)(( i & 0xFF00 ) >>> 8);         i = (short)( high | low );         return i;    }          /** Calculates the frame size for PCM frames.         * Note that this method is appropriate for non-packed samples.         * For instance, 12 bit, 2 channels will return 4 bytes, not 3.         * @param sampleSizeInBits the size of a single sample in bits         * @param channels the number of channels         * @return the size of a PCM frame in bytes.         */        protected static int calculatePCMFrameSize(int sampleSizeInBits,                                                                                        int channels) {                return ((sampleSizeInBits + 7) / 8) * channels;        }}