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	/*
	* Copyright (c) 1999, 2020, 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 javax.sound.sampled.AudioFormat;
	import javax.sound.sampled.AudioInputStream;
	import javax.sound.sampled.AudioSystem;

	/**
	* Common conversions etc.
	*
	* @author Kara Kytle
	* @author Florian Bomers
	*/
	public final class Toolkit {

	/**
	* Suppresses default constructor, ensuring non-instantiability.
	*/
	private Toolkit() {
	}

	/**
	* Converts bytes from signed to unsigned.
	*/
	static void getUnsigned8(byte[] b, int off, int len) {
	for (int i = off; i < (off+len); i++) {
	b[i] += 128;
	}
	}


	/**
	* Swaps bytes.
	* @throws ArrayOutOfBoundsException if len is not a multiple of 2.
	*/
	static void getByteSwapped(byte[] b, int off, int len) {

	byte tempByte;
	for (int i = off; i < (off+len); i+=2) {

	tempByte = b[i];
	b[i] = b[i+1];
	b[i+1] = tempByte;
	}
	}


	/**
	* Linear to DB scale conversion.
	*/
	static float linearToDB(float linear) {

	float dB = (float) (Math.log((double)((linear==0.0)?0.0001:linear))/Math.log(10.0) * 20.0);
	return dB;
	}


	/**
	* DB to linear scale conversion.
	*/
	static float dBToLinear(float dB) {

	float linear = (float) Math.pow(10.0, dB/20.0);
	return linear;
	}

	/*
	* returns bytes aligned to a multiple of blocksize
	* the return value will be in the range of (bytes-blocksize+1) ... bytes
	*/
	static long align(long bytes, int blockSize) {
	// prevent null pointers
	if (blockSize <= 1) {
	return bytes;
	}
	return bytes - (bytes % blockSize);
	}

	static int align(int bytes, int blockSize) {
	// prevent null pointers
	if (blockSize <= 1) {
	return bytes;
	}
	return bytes - (bytes % blockSize);
	}


	/*
	* gets the number of bytes needed to play the specified number of milliseconds
	*/
	static long millis2bytes(AudioFormat format, long millis) {
	long result = (long) (millis * format.getFrameRate() / 1000.0f * format.getFrameSize());
	return align(result, format.getFrameSize());
	}

	/*
	* gets the time in milliseconds for the given number of bytes
	*/
	static long bytes2millis(AudioFormat format, long bytes) {
	return (long) (bytes / format.getFrameRate() * 1000.0f / format.getFrameSize());
	}

	/*
	* gets the number of bytes needed to play the specified number of microseconds
	*/
	static long micros2bytes(AudioFormat format, long micros) {
	long result = (long) (micros * format.getFrameRate() / 1000000.0f * format.getFrameSize());
	return align(result, format.getFrameSize());
	}

	/*
	* gets the time in microseconds for the given number of bytes
	*/
	static long bytes2micros(AudioFormat format, long bytes) {
	return (long) (bytes / format.getFrameRate() * 1000000.0f / format.getFrameSize());
	}

	/*
	* gets the number of frames needed to play the specified number of microseconds
	*/
	static long micros2frames(AudioFormat format, long micros) {
	return (long) (micros * format.getFrameRate() / 1000000.0f);
	}

	/*
	* gets the time in microseconds for the given number of frames
	*/
	static long frames2micros(AudioFormat format, long frames) {
	return (long) (((double) frames) / format.getFrameRate() * 1000000.0d);
	}

	static void isFullySpecifiedAudioFormat(AudioFormat format) {
	// Our code requires a positive frame size, that's probably is not
	// necessary for non-linear encodings, but for now
	// IllegalArgumentException is better than ArithmeticException
	if (format.getFrameSize() <= 0) {
	throw new IllegalArgumentException("invalid frame size: "
	+((format.getFrameSize() == -1) ?
	"NOT_SPECIFIED":String.valueOf(format.getFrameSize())));
	}
	if (!format.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)
	&& !format.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED)
	&& !format.getEncoding().equals(AudioFormat.Encoding.ULAW)
	&& !format.getEncoding().equals(AudioFormat.Encoding.ALAW)) {
	// we don't know how to verify possibly non-linear encodings
	return;
	}
	if (format.getFrameRate() <= 0) {
	throw new IllegalArgumentException("invalid frame rate: "
	+((format.getFrameRate()==-1)?
	"NOT_SPECIFIED":String.valueOf(format.getFrameRate())));
	}
	if (format.getSampleRate() <= 0) {
	throw new IllegalArgumentException("invalid sample rate: "
	+((format.getSampleRate()==-1)?
	"NOT_SPECIFIED":String.valueOf(format.getSampleRate())));
	}
	if (format.getSampleSizeInBits() <= 0) {
	throw new IllegalArgumentException("invalid sample size in bits: "
	+((format.getSampleSizeInBits()==-1)?
	"NOT_SPECIFIED":String.valueOf(format.getSampleSizeInBits())));
	}
	if (format.getChannels() <= 0) {
	throw new IllegalArgumentException("invalid number of channels: "
	+((format.getChannels()==-1)?
	"NOT_SPECIFIED":String.valueOf(format.getChannels())));
	}
	}


	static boolean isFullySpecifiedPCMFormat(AudioFormat format) {
	if (!format.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)
	&& !format.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED)) {
	return false;
	}
	if ((format.getFrameRate() <= 0)
	\|\| (format.getSampleRate() <= 0)
	\|\| (format.getSampleSizeInBits() <= 0)
	\|\| (format.getFrameSize() <= 0)
	\|\| (format.getChannels() <= 0)) {
	return false;
	}
	return true;
	}


	public static AudioInputStream getPCMConvertedAudioInputStream(AudioInputStream ais) {
	// we can't open the device for non-PCM playback, so we have
	// convert any other encodings to PCM here (at least we try!)
	AudioFormat af = ais.getFormat();

	if( (!af.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)) &&
	(!af.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED))) {

	try {
	AudioFormat newFormat =
	new AudioFormat( AudioFormat.Encoding.PCM_SIGNED,
	af.getSampleRate(),
	16,
	af.getChannels(),
	af.getChannels() * 2,
	af.getSampleRate(),
	Platform.isBigEndian());
	ais = AudioSystem.getAudioInputStream(newFormat, ais);
	} catch (Exception e) {
	if (Printer.err) e.printStackTrace();
	ais = null;
	}
	}

	return ais;
	}

	}

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