/* * Copyright (c) 1999, 2014, 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(((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; } }