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	/*
	* Copyright (c) 1999, 2013, 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.BufferedInputStream;
	import java.io.DataInputStream;
	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.AudioFormat;
	import javax.sound.sampled.AudioInputStream;
	import javax.sound.sampled.AudioSystem;
	import javax.sound.sampled.UnsupportedAudioFileException;


	/**
	* AU file reader.
	*
	* @author Kara Kytle
	* @author Jan Borgersen
	* @author Florian Bomers
	*/
	public final class AuFileReader extends 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
	*/
	public AudioFileFormat getAudioFileFormat(InputStream stream) throws UnsupportedAudioFileException, IOException {

	AudioFormat format = null;
	AuFileFormat fileFormat = null;
	int maxReadLength = 28;
	boolean bigendian = false;
	int magic = -1;
	int headerSize = -1;
	int dataSize = -1;
	int encoding_local = -1;
	int sampleRate = -1;
	int frameRate = -1;
	int frameSize = -1;
	int channels = -1;
	final int sampleSizeInBits;
	int length = 0;
	int nread = 0;
	AudioFormat.Encoding encoding = null;

	DataInputStream dis = new DataInputStream( stream );

	dis.mark(maxReadLength);

	magic = dis.readInt();

	if (! (magic == AuFileFormat.AU_SUN_MAGIC) \|\| (magic == AuFileFormat.AU_DEC_MAGIC) \|\|
	(magic == AuFileFormat.AU_SUN_INV_MAGIC) \|\| (magic == AuFileFormat.AU_DEC_INV_MAGIC) ) {

	// not AU, reset the stream, place into exception, throw exception
	dis.reset();
	throw new UnsupportedAudioFileException("not an AU file");
	}

	if ((magic == AuFileFormat.AU_SUN_MAGIC) \|\| (magic == AuFileFormat.AU_DEC_MAGIC)) {
	bigendian = true; // otherwise little-endian
	}

	headerSize = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
	dataSize = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
	encoding_local = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
	sampleRate = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
	channels = (bigendian==true ? dis.readInt() : rllong(dis) ); nread += 4;
	if (channels <= 0) {
	dis.reset();
	throw new UnsupportedAudioFileException("Invalid number of channels");
	}

	frameRate = sampleRate;

	switch (encoding_local) {
	case AuFileFormat.AU_ULAW_8:
	encoding = AudioFormat.Encoding.ULAW;
	sampleSizeInBits = 8;
	break;
	case AuFileFormat.AU_ALAW_8:
	encoding = AudioFormat.Encoding.ALAW;
	sampleSizeInBits = 8;
	break;
	case AuFileFormat.AU_LINEAR_8:
	// $$jb: 04.29.99: 8bit linear is signed, not unsigned
	encoding = AudioFormat.Encoding.PCM_SIGNED;
	sampleSizeInBits = 8;
	break;
	case AuFileFormat.AU_LINEAR_16:
	encoding = AudioFormat.Encoding.PCM_SIGNED;
	sampleSizeInBits = 16;
	break;
	case AuFileFormat.AU_LINEAR_24:
	encoding = AudioFormat.Encoding.PCM_SIGNED;

	sampleSizeInBits = 24;
	break;
	case AuFileFormat.AU_LINEAR_32:
	encoding = AudioFormat.Encoding.PCM_SIGNED;

	sampleSizeInBits = 32;
	break;
	// $jb: 03.19.99: we don't support these ...
	/* case AuFileFormat.AU_FLOAT:
	encoding = new AudioFormat.FLOAT;
	sampleSizeInBits = 32;
	break;
	case AuFileFormat.AU_DOUBLE:
	encoding = new AudioFormat.DOUBLE;
	sampleSizeInBits = 8;
	break;
	case AuFileFormat.AU_ADPCM_G721:
	encoding = new AudioFormat.G721_ADPCM;
	sampleSizeInBits = 16;
	break;
	case AuFileFormat.AU_ADPCM_G723_3:
	encoding = new AudioFormat.G723_3;
	sampleSize = 24;
	SamplePerUnit = 8;
	break;
	case AuFileFormat.AU_ADPCM_G723_5:
	encoding = new AudioFormat.G723_5;
	sampleSize = 40;
	SamplePerUnit = 8;
	break;
	*/
	default:
	// unsupported filetype, throw exception
	dis.reset();
	throw new UnsupportedAudioFileException("not a valid AU file");
	}

	frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);
	//$$fb 2002-11-02: fix for 4629669: AU file reader: problems with empty files
	if( dataSize < 0 ) {
	length = AudioSystem.NOT_SPECIFIED;
	} else {
	//$$fb 2003-10-20: fix for 4940459: AudioInputStream.getFrameLength() returns 0 instead of NOT_SPECIFIED
	length = dataSize / frameSize;
	}

	format = new AudioFormat( encoding, (float)sampleRate, sampleSizeInBits,
	channels, frameSize, (float)frameRate, bigendian);

	fileFormat = new AuFileFormat( AudioFileFormat.Type.AU, dataSize+headerSize,
	format, length);

	dis.reset(); // Throws IOException
	return fileFormat;

	}


	/**
	* 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 AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException {

	InputStream urlStream = null;
	BufferedInputStream bis = null;
	AudioFileFormat fileFormat = null;
	AudioFormat format = null;

	urlStream = url.openStream(); // throws IOException

	try {
	bis = new BufferedInputStream( urlStream, bisBufferSize );

	fileFormat = getAudioFileFormat( bis ); // throws UnsupportedAudioFileException
	} finally {
	urlStream.close();
	}

	return fileFormat;
	}


	/**
	* 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
	*/
	public AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException {

	FileInputStream fis = null;
	BufferedInputStream bis = null;
	AudioFileFormat fileFormat = null;
	AudioFormat format = null;

	fis = new FileInputStream( file ); // throws IOException
	// part of fix for 4325421
	try {
	bis = new BufferedInputStream( fis, bisBufferSize );
	fileFormat = getAudioFileFormat( bis ); // throws UnsupportedAudioFileException
	} finally {
	fis.close();
	}

	return fileFormat;
	}


	/**
	* 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
	*/
	public AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException {

	DataInputStream dis = null;
	int headerSize;
	AudioFileFormat fileFormat = null;
	AudioFormat format = null;


	fileFormat = getAudioFileFormat( stream ); // throws UnsupportedAudioFileException, IOException

	// if we passed this call, we have an AU file.

	format = fileFormat.getFormat();

	dis = new DataInputStream(stream);

	// now seek past the header

	dis.readInt(); // magic
	headerSize = (format.isBigEndian()==true ? dis.readInt() : rllong(dis) );
	dis.skipBytes( headerSize - 8 );


	// we've got everything, and the stream should be at the
	// beginning of the data chunk, so return an AudioInputStream.

	return new AudioInputStream(dis, format, fileFormat.getFrameLength());
	}


	/**
	* 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
	*/
	public AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException {

	InputStream urlStream = null;
	BufferedInputStream bis = null;
	AudioFileFormat fileFormat = null;

	urlStream = url.openStream(); // throws IOException
	AudioInputStream result = null;
	try {
	bis = new BufferedInputStream( urlStream, bisBufferSize );
	result = getAudioInputStream( (InputStream)bis );
	} finally {
	if (result == null) {
	urlStream.close();
	}
	}
	return result;
	}


	/**
	* 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
	*/
	public AudioInputStream getAudioInputStream(File file) throws UnsupportedAudioFileException, IOException {

	FileInputStream fis = null;
	BufferedInputStream bis = null;
	AudioFileFormat fileFormat = null;

	fis = new FileInputStream( file ); // throws IOException
	AudioInputStream result = null;
	// part of fix for 4325421
	try {
	bis = new BufferedInputStream( fis, bisBufferSize );
	result = getAudioInputStream( (InputStream)bis );
	} finally {
	if (result == null) {
	fis.close();
	}
	}

	return result;
	}
	}

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