257 lines
8.9 KiB
Java
257 lines
8.9 KiB
Java
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.media.sound;
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import java.io.File;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.DataInputStream;
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import java.net.URL;
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import javax.sound.sampled.AudioFileFormat;
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import javax.sound.sampled.AudioInputStream;
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import javax.sound.sampled.UnsupportedAudioFileException;
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import javax.sound.sampled.spi.AudioFileReader;
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/**
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* Abstract File Reader class.
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*
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* @author Jan Borgersen
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*/
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abstract class SunFileReader extends AudioFileReader {
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// buffer size for temporary input streams
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protected static final int bisBufferSize = 4096;
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/**
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* Constructs a new SunFileReader object.
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*/
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SunFileReader() {
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}
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// METHODS TO IMPLEMENT AudioFileReader
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/**
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* Obtains the audio file format of the input stream provided. The stream must
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* point to valid audio file data. In general, audio file providers may
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* need to read some data from the stream before determining whether they
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* support it. These parsers must
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* be able to mark the stream, read enough data to determine whether they
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* support the stream, and, if not, reset the stream's read pointer to its original
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* position. If the input stream does not support this, this method may fail
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* with an IOException.
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* @param stream the input stream from which file format information should be
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* extracted
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* @return an <code>AudioFileFormat</code> object describing the audio file format
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* @throws UnsupportedAudioFileException if the stream does not point to valid audio
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* file data recognized by the system
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* @throws IOException if an I/O exception occurs
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* @see InputStream#markSupported
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* @see InputStream#mark
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*/
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abstract public AudioFileFormat getAudioFileFormat(InputStream stream) throws UnsupportedAudioFileException, IOException;
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/**
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* Obtains the audio file format of the URL provided. The URL must
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* point to valid audio file data.
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* @param url the URL from which file format information should be
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* extracted
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* @return an <code>AudioFileFormat</code> object describing the audio file format
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* @throws UnsupportedAudioFileException if the URL does not point to valid audio
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* file data recognized by the system
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* @throws IOException if an I/O exception occurs
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*/
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abstract public AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException;
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/**
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* Obtains the audio file format of the File provided. The File must
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* point to valid audio file data.
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* @param file the File from which file format information should be
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* extracted
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* @return an <code>AudioFileFormat</code> object describing the audio file format
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* @throws UnsupportedAudioFileException if the File does not point to valid audio
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* file data recognized by the system
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* @throws IOException if an I/O exception occurs
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*/
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abstract public AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException;
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/**
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* Obtains an audio stream from the input stream provided. The stream must
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* point to valid audio file data. In general, audio file providers may
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* need to read some data from the stream before determining whether they
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* support it. These parsers must
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* be able to mark the stream, read enough data to determine whether they
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* support the stream, and, if not, reset the stream's read pointer to its original
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* position. If the input stream does not support this, this method may fail
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* with an IOException.
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* @param stream the input stream from which the <code>AudioInputStream</code> should be
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* constructed
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* @return an <code>AudioInputStream</code> object based on the audio file data contained
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* in the input stream.
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* @throws UnsupportedAudioFileException if the stream does not point to valid audio
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* file data recognized by the system
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* @throws IOException if an I/O exception occurs
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* @see InputStream#markSupported
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* @see InputStream#mark
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*/
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abstract public AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException;
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/**
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* Obtains an audio stream from the URL provided. The URL must
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* point to valid audio file data.
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* @param url the URL for which the <code>AudioInputStream</code> should be
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* constructed
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* @return an <code>AudioInputStream</code> object based on the audio file data pointed
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* to by the URL
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* @throws UnsupportedAudioFileException if the URL does not point to valid audio
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* file data recognized by the system
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* @throws IOException if an I/O exception occurs
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*/
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abstract public AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException;
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/**
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* Obtains an audio stream from the File provided. The File must
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* point to valid audio file data.
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* @param file the File for which the <code>AudioInputStream</code> should be
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* constructed
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* @return an <code>AudioInputStream</code> object based on the audio file data pointed
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* to by the File
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* @throws UnsupportedAudioFileException if the File does not point to valid audio
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* file data recognized by the system
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* @throws IOException if an I/O exception occurs
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*/
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abstract public AudioInputStream getAudioInputStream(File file) throws UnsupportedAudioFileException, IOException;
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// HELPER METHODS
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/**
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* rllong
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* Protected helper method to read 64 bits and changing the order of
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* each bytes.
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* @param DataInputStream
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* @return 32 bits swapped value.
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* @exception IOException
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*/
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final int rllong(DataInputStream dis) throws IOException {
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int b1, b2, b3, b4 ;
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int i = 0;
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i = dis.readInt();
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b1 = ( i & 0xFF ) << 24 ;
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b2 = ( i & 0xFF00 ) << 8;
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b3 = ( i & 0xFF0000 ) >> 8;
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b4 = ( i & 0xFF000000 ) >>> 24;
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i = ( b1 | b2 | b3 | b4 );
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return i;
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}
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/**
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* big2little
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* Protected helper method to swap the order of bytes in a 32 bit int
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* @param int
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* @return 32 bits swapped value
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*/
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final int big2little(int i) {
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int b1, b2, b3, b4 ;
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b1 = ( i & 0xFF ) << 24 ;
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b2 = ( i & 0xFF00 ) << 8;
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b3 = ( i & 0xFF0000 ) >> 8;
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b4 = ( i & 0xFF000000 ) >>> 24;
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i = ( b1 | b2 | b3 | b4 );
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return i;
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}
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/**
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* rlshort
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* Protected helper method to read 16 bits value. Swap high with low byte.
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* @param DataInputStream
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* @return the swapped value.
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* @exception IOException
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*/
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final short rlshort(DataInputStream dis) throws IOException {
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short s=0;
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short high, low;
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s = dis.readShort();
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high = (short)(( s & 0xFF ) << 8) ;
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low = (short)(( s & 0xFF00 ) >>> 8);
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s = (short)( high | low );
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return s;
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}
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/**
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* big2little
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* Protected helper method to swap the order of bytes in a 16 bit short
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* @param int
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* @return 16 bits swapped value
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*/
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final short big2littleShort(short i) {
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short high, low;
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high = (short)(( i & 0xFF ) << 8) ;
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low = (short)(( i & 0xFF00 ) >>> 8);
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i = (short)( high | low );
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return i;
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}
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/** Calculates the frame size for PCM frames.
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* Note that this method is appropriate for non-packed samples.
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* For instance, 12 bit, 2 channels will return 4 bytes, not 3.
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* @param sampleSizeInBits the size of a single sample in bits
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* @param channels the number of channels
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* @return the size of a PCM frame in bytes.
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*/
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static final int calculatePCMFrameSize(int sampleSizeInBits, int channels) {
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return ((sampleSizeInBits + 7) / 8) * channels;
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}
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}
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