1 /* 2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.media.sound; 27 28 import java.security.AccessController; 29 import java.security.PrivilegedAction; 30 import java.util.StringTokenizer; 31 32 /** 33 * Audio configuration class for exposing attributes specific to the platform or system. 34 * 35 * @author Kara Kytle 36 * @author Florian Bomers 37 */ 38 final class Platform { 39 40 // native library we need to load 41 private static final String libName = "jsound"; 42 43 private static boolean isNativeLibLoaded; 44 45 // SYSTEM CHARACTERISTICS 46 // vary according to hardware architecture 47 48 // intel is little-endian. sparc is big-endian. 49 private static boolean bigEndian; 50 51 static { 52 loadLibraries(); 53 } 54 55 /** 56 * Private constructor. 57 */ 58 private Platform() { 59 } 60 61 /** 62 * Dummy method for forcing initialization. 63 */ 64 static void initialize() { 65 } 66 67 /** 68 * Determine whether the system is big-endian. 69 */ 70 static boolean isBigEndian() { 71 return bigEndian; 72 } 73 74 /** 75 * Load the native library or libraries. 76 */ 77 private static void loadLibraries() { 78 // load the native library 79 isNativeLibLoaded = true; 80 try { 81 AccessController.doPrivileged((PrivilegedAction<Void>) () -> { 82 System.loadLibrary(libName); 83 return null; 84 }); 85 } catch (Throwable t) { 86 if (Printer.err) Printer.err("Couldn't load library "+libName+": "+t.toString()); 87 isNativeLibLoaded = false; 88 } 89 if (isNativeLibLoaded) { 90 bigEndian = nIsBigEndian(); 91 } 92 } 93 94 static boolean isMidiIOEnabled() { 95 return isNativeLibLoaded; 96 } 97 98 static boolean isPortsEnabled() { 99 return isNativeLibLoaded; 100 } 101 102 static boolean isDirectAudioEnabled() { 103 return isNativeLibLoaded; 104 } 105 106 // the following native method is implemented in Platform.c 107 private static native boolean nIsBigEndian(); 108 }