/*
* Copyright (c) 1999, 2016, 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
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package com.sun.media.sound;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.EOFException;
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.AudioInputStream;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.sound.sampled.spi.AudioFileReader;
/**
* Abstract File Reader class.
*
* @author Jan Borgersen
*/
abstract class SunFileReader extends AudioFileReader {
@Override
public final StandardFileFormat getAudioFileFormat(final InputStream stream)
throws UnsupportedAudioFileException, IOException {
stream.mark(200); // The biggest value which was historically used
try {
return getAudioFileFormatImpl(stream);
} catch (final EOFException ignored) {
// the header is less than was expected
throw new UnsupportedAudioFileException();
} finally {
stream.reset();
}
}
@Override
public final AudioFileFormat getAudioFileFormat(final URL url)
throws UnsupportedAudioFileException, IOException {
try (InputStream is = url.openStream()) {
return getAudioFileFormatImpl(new BufferedInputStream(is));
} catch (final EOFException ignored) {
// the header is less than was expected
throw new UnsupportedAudioFileException();
}
}
@Override
public final AudioFileFormat getAudioFileFormat(final File file)
throws UnsupportedAudioFileException, IOException {
try (InputStream is = new FileInputStream(file)) {
return getAudioFileFormatImpl(new BufferedInputStream(is));
} catch (final EOFException ignored) {
// the header is less than was expected
throw new UnsupportedAudioFileException();
}
}
@Override
public AudioInputStream getAudioInputStream(final InputStream stream)
throws UnsupportedAudioFileException, IOException {
stream.mark(200); // The biggest value which was historically used
try {
final StandardFileFormat format = getAudioFileFormatImpl(stream);
// we've got everything, the stream is supported and it is at the
// beginning of the audio data, so return an AudioInputStream
return new AudioInputStream(stream, format.getFormat(),
format.getLongFrameLength());
} catch (UnsupportedAudioFileException | EOFException ignored) {
// stream is unsupported or the header is less than was expected
stream.reset();
throw new UnsupportedAudioFileException();
}
}
@Override
public final AudioInputStream getAudioInputStream(final URL url)
throws UnsupportedAudioFileException, IOException {
final InputStream urlStream = url.openStream();
try {
return getAudioInputStream(new BufferedInputStream(urlStream));
} catch (final Throwable e) {
closeSilently(urlStream);
throw e;
}
}
@Override
public final AudioInputStream getAudioInputStream(final File file)
throws UnsupportedAudioFileException, IOException {
final InputStream fileStream = new FileInputStream(file);
try {
return getAudioInputStream(new BufferedInputStream(fileStream));
} catch (final Throwable e) {
closeSilently(fileStream);
throw e;
}
}
/**
* Obtains the audio file format of the input stream provided. The stream
* must point to valid audio file data. Note that default implementation of
* {@link #getAudioInputStream(InputStream)} assume that this method leaves
* the input stream at the beginning of the audio data.
*
* @param stream the input stream from which file format information should
* be extracted
* @return an {@code AudioFileFormat} 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
* @throws EOFException is used incorrectly by our readers instead of
* UnsupportedAudioFileException if the header is less than was
* expected
*/
abstract StandardFileFormat getAudioFileFormatImpl(InputStream stream)
throws UnsupportedAudioFileException, IOException;
// HELPER METHODS
/**
* Closes the InputStream when we have read all necessary data from it, and
* ignores an IOException.
*
* @param is the InputStream which should be closed
*/
private static void closeSilently(final InputStream is) {
try {
is.close();
} catch (final IOException ignored) {
// IOException is ignored
}
}
/**
* rllong
* Protected helper method to read 64 bits and changing the order of
* each bytes.
* @param DataInputStream
* @return 32 bits swapped value.
* @exception IOException
*/
final 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
*/
final 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
*/
final 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
*/
final 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.
*/
static final int calculatePCMFrameSize(int sampleSizeInBits, int channels) {
try {
return Math.multiplyExact((sampleSizeInBits + 7) / 8, channels);
} catch (final ArithmeticException ignored) {
return 0;
}
}
}