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/*
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* Copyright (c) 1999, 2007, 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 javax.sound.sampled.AudioFormat;
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import javax.sound.sampled.AudioInputStream;
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import javax.sound.sampled.AudioSystem;
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/**
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* Common conversions etc.
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*
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* @author Kara Kytle
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* @author Florian Bomers
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*/
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public class Toolkit {
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/**
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* Converts bytes from signed to unsigned.
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*/
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static void getUnsigned8(byte[] b, int off, int len) {
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for (int i = off; i < (off+len); i++) {
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b[i] += 128;
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}
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}
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/**
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* Swaps bytes.
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* @throws ArrayOutOfBoundsException if len is not a multiple of 2.
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*/
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static void getByteSwapped(byte[] b, int off, int len) {
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byte tempByte;
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for (int i = off; i < (off+len); i+=2) {
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tempByte = b[i];
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b[i] = b[i+1];
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b[i+1] = tempByte;
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}
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}
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/**
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* Linear to DB scale conversion.
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*/
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static float linearToDB(float linear) {
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float dB = (float) (Math.log((double)((linear==0.0)?0.0001:linear))/Math.log(10.0) * 20.0);
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return dB;
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}
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/**
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* DB to linear scale conversion.
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*/
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static float dBToLinear(float dB) {
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float linear = (float) Math.pow(10.0, dB/20.0);
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return linear;
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}
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/*
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* returns bytes aligned to a multiple of blocksize
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* the return value will be in the range of (bytes-blocksize+1) ... bytes
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*/
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static long align(long bytes, int blockSize) {
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// prevent null pointers
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if (blockSize <= 1) {
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return bytes;
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}
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return bytes - (bytes % blockSize);
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}
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static int align(int bytes, int blockSize) {
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// prevent null pointers
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if (blockSize <= 1) {
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return bytes;
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}
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return bytes - (bytes % blockSize);
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}
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/*
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* gets the number of bytes needed to play the specified number of milliseconds
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*/
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static long millis2bytes(AudioFormat format, long millis) {
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long result = (long) (millis * format.getFrameRate() / 1000.0f * format.getFrameSize());
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return align(result, format.getFrameSize());
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}
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/*
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* gets the time in milliseconds for the given number of bytes
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*/
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static long bytes2millis(AudioFormat format, long bytes) {
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return (long) (bytes / format.getFrameRate() * 1000.0f / format.getFrameSize());
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}
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/*
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* gets the number of bytes needed to play the specified number of microseconds
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*/
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static long micros2bytes(AudioFormat format, long micros) {
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long result = (long) (micros * format.getFrameRate() / 1000000.0f * format.getFrameSize());
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return align(result, format.getFrameSize());
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}
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/*
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* gets the time in microseconds for the given number of bytes
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*/
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static long bytes2micros(AudioFormat format, long bytes) {
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return (long) (bytes / format.getFrameRate() * 1000000.0f / format.getFrameSize());
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}
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/*
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* gets the number of frames needed to play the specified number of microseconds
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*/
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static long micros2frames(AudioFormat format, long micros) {
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return (long) (micros * format.getFrameRate() / 1000000.0f);
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}
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/*
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* gets the time in microseconds for the given number of frames
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*/
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static long frames2micros(AudioFormat format, long frames) {
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return (long) (((double) frames) / format.getFrameRate() * 1000000.0d);
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}
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static void isFullySpecifiedAudioFormat(AudioFormat format) {
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if (!format.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)
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&& !format.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED)
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&& !format.getEncoding().equals(AudioFormat.Encoding.ULAW)
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&& !format.getEncoding().equals(AudioFormat.Encoding.ALAW)) {
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// we don't know how to verify possibly non-linear encodings
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return;
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}
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if (format.getFrameRate() <= 0) {
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throw new IllegalArgumentException("invalid frame rate: "
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+((format.getFrameRate()==-1)?
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"NOT_SPECIFIED":String.valueOf(format.getFrameRate())));
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}
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if (format.getSampleRate() <= 0) {
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throw new IllegalArgumentException("invalid sample rate: "
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+((format.getSampleRate()==-1)?
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"NOT_SPECIFIED":String.valueOf(format.getSampleRate())));
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}
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if (format.getSampleSizeInBits() <= 0) {
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throw new IllegalArgumentException("invalid sample size in bits: "
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+((format.getSampleSizeInBits()==-1)?
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"NOT_SPECIFIED":String.valueOf(format.getSampleSizeInBits())));
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}
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if (format.getFrameSize() <= 0) {
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throw new IllegalArgumentException("invalid frame size: "
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+((format.getFrameSize()==-1)?
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"NOT_SPECIFIED":String.valueOf(format.getFrameSize())));
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}
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if (format.getChannels() <= 0) {
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throw new IllegalArgumentException("invalid number of channels: "
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+((format.getChannels()==-1)?
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"NOT_SPECIFIED":String.valueOf(format.getChannels())));
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}
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}
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static boolean isFullySpecifiedPCMFormat(AudioFormat format) {
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if (!format.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)
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&& !format.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED)) {
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return false;
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}
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if ((format.getFrameRate() <= 0)
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|| (format.getSampleRate() <= 0)
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|| (format.getSampleSizeInBits() <= 0)
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|| (format.getFrameSize() <= 0)
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|| (format.getChannels() <= 0)) {
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return false;
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}
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return true;
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}
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public static AudioInputStream getPCMConvertedAudioInputStream(AudioInputStream ais) {
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// we can't open the device for non-PCM playback, so we have
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// convert any other encodings to PCM here (at least we try!)
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AudioFormat af = ais.getFormat();
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if( (!af.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)) &&
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(!af.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED))) {
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try {
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AudioFormat newFormat =
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new AudioFormat( AudioFormat.Encoding.PCM_SIGNED,
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af.getSampleRate(),
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16,
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af.getChannels(),
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af.getChannels() * 2,
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af.getSampleRate(),
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Platform.isBigEndian());
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ais = AudioSystem.getAudioInputStream(newFormat, ais);
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} catch (Exception e) {
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if (Printer.err) e.printStackTrace();
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ais = null;
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}
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}
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return ais;
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}
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}
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