/*
* Copyright (c) 1999, 2007, 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 class 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) {
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.getFrameSize() <= 0) {
throw new IllegalArgumentException("invalid frame size: "
+((format.getFrameSize()==-1)?
"NOT_SPECIFIED":String.valueOf(format.getFrameSize())));
}
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;
}
}