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| 1 | +/* | |
| 2 | + * Copyright (c) 1999, 2007, 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.util.Vector; | |
| 29 | + | |
| 30 | +import javax.sound.sampled.AudioSystem; | |
| 31 | +import javax.sound.sampled.Control; | |
| 32 | +import javax.sound.sampled.Mixer; | |
| 33 | +import javax.sound.sampled.Line; | |
| 34 | +import javax.sound.sampled.LineEvent; | |
| 35 | +import javax.sound.sampled.LineListener; | |
| 36 | +import javax.sound.sampled.LineUnavailableException; | |
| 37 | + | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * AbstractLine | |
| 41 | + * | |
| 42 | + * @author Kara Kytle | |
| 43 | + */ | |
| 44 | +abstract class AbstractLine implements Line { | |
| 45 | + | |
| 46 | + protected Line.Info info; | |
| 47 | + protected Control[] controls; | |
| 48 | + protected AbstractMixer mixer; | |
| 49 | + private boolean open = false; | |
| 50 | + private Vector listeners = new Vector(); | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * Global event thread | |
| 54 | + */ | |
| 55 | + private static final EventDispatcher eventDispatcher; | |
| 56 | + | |
| 57 | + static { | |
| 58 | + // create and start the global event thread | |
| 59 | + | |
| 60 | + // $$kk: 12.21.98: | |
| 61 | + // 1) probably don't want a single global event queue | |
| 62 | + // 2) need a way to stop this thread when the engine is done | |
| 63 | + | |
| 64 | + eventDispatcher = new EventDispatcher(); | |
| 65 | + eventDispatcher.start(); | |
| 66 | + } | |
| 67 | + | |
| 68 | + | |
| 69 | + /** | |
| 70 | + * Constructs a new AbstractLine. | |
| 71 | + * @param mixer the mixer with which this line is associated | |
| 72 | + * @param controls set of supported controls | |
| 73 | + */ | |
| 74 | + protected AbstractLine(Line.Info info, AbstractMixer mixer, Control[] controls) { | |
| 75 | + | |
| 76 | + if (controls == null) { | |
| 77 | + controls = new Control[0]; | |
| 78 | + } | |
| 79 | + | |
| 80 | + this.info = info; | |
| 81 | + this.mixer = mixer; | |
| 82 | + this.controls = controls; | |
| 83 | + } | |
| 84 | + | |
| 85 | + | |
| 86 | + // LINE METHODS | |
| 87 | + | |
| 88 | + public Line.Info getLineInfo() { | |
| 89 | + return info; | |
| 90 | + } | |
| 91 | + | |
| 92 | + | |
| 93 | + public boolean isOpen() { | |
| 94 | + return open; | |
| 95 | + } | |
| 96 | + | |
| 97 | + | |
| 98 | + public void addLineListener(LineListener listener) { | |
| 99 | + | |
| 100 | + synchronized(listeners) { | |
| 101 | + if ( ! (listeners.contains(listener)) ) { | |
| 102 | + listeners.addElement(listener); | |
| 103 | + } | |
| 104 | + } | |
| 105 | + } | |
| 106 | + | |
| 107 | + | |
| 108 | + /** | |
| 109 | + * Removes an audio listener. | |
| 110 | + * @param listener listener to remove | |
| 111 | + */ | |
| 112 | + public void removeLineListener(LineListener listener) { | |
| 113 | + listeners.removeElement(listener); | |
| 114 | + } | |
| 115 | + | |
| 116 | + | |
| 117 | + /** | |
| 118 | + * Obtains the set of controls supported by the | |
| 119 | + * line. If no controls are supported, returns an | |
| 120 | + * array of length 0. | |
| 121 | + * @return control set | |
| 122 | + */ | |
| 123 | + public Control[] getControls() { | |
| 124 | + | |
| 125 | + Control[] returnedArray = new Control[controls.length]; | |
| 126 | + | |
| 127 | + for (int i = 0; i < controls.length; i++) { | |
| 128 | + returnedArray[i] = controls[i]; | |
| 129 | + } | |
| 130 | + | |
| 131 | + return returnedArray; | |
| 132 | + } | |
| 133 | + | |
| 134 | + | |
| 135 | + public boolean isControlSupported(Control.Type controlType) { | |
| 136 | + | |
| 137 | + // protect against a NullPointerException | |
| 138 | + if (controlType == null) { | |
| 139 | + return false; | |
| 140 | + } | |
| 141 | + | |
| 142 | + for (int i = 0; i < controls.length; i++) { | |
| 143 | + if (controlType == controls[i].getType()) { | |
| 144 | + return true; | |
| 145 | + } | |
| 146 | + } | |
| 147 | + | |
| 148 | + return false; | |
| 149 | + } | |
| 150 | + | |
| 151 | + | |
| 152 | + public Control getControl(Control.Type controlType) { | |
| 153 | + | |
| 154 | + // protect against a NullPointerException | |
| 155 | + if (controlType != null) { | |
| 156 | + | |
| 157 | + for (int i = 0; i < controls.length; i++) { | |
| 158 | + if (controlType == controls[i].getType()) { | |
| 159 | + return controls[i]; | |
| 160 | + } | |
| 161 | + } | |
| 162 | + } | |
| 163 | + | |
| 164 | + throw new IllegalArgumentException("Unsupported control type: " + controlType); | |
| 165 | + } | |
| 166 | + | |
| 167 | + | |
| 168 | + // HELPER METHODS | |
| 169 | + | |
| 170 | + | |
| 171 | + /** | |
| 172 | + * This method sets the open state and generates | |
| 173 | + * events if it changes. | |
| 174 | + */ | |
| 175 | + protected void setOpen(boolean open) { | |
| 176 | + | |
| 177 | + if (Printer.trace) Printer.trace("> "+getClass().getName()+" (AbstractLine): setOpen(" + open + ") this.open: " + this.open); | |
| 178 | + | |
| 179 | + boolean sendEvents = false; | |
| 180 | + long position = getLongFramePosition(); | |
| 181 | + | |
| 182 | + synchronized (this) { | |
| 183 | + if (this.open != open) { | |
| 184 | + this.open = open; | |
| 185 | + sendEvents = true; | |
| 186 | + } | |
| 187 | + } | |
| 188 | + | |
| 189 | + if (sendEvents) { | |
| 190 | + if (open) { | |
| 191 | + sendEvents(new LineEvent(this, LineEvent.Type.OPEN, position)); | |
| 192 | + } else { | |
| 193 | + sendEvents(new LineEvent(this, LineEvent.Type.CLOSE, position)); | |
| 194 | + } | |
| 195 | + } | |
| 196 | + if (Printer.trace) Printer.trace("< "+getClass().getName()+" (AbstractLine): setOpen(" + open + ") this.open: " + this.open); | |
| 197 | + } | |
| 198 | + | |
| 199 | + | |
| 200 | + /** | |
| 201 | + * Send line events. | |
| 202 | + */ | |
| 203 | + protected void sendEvents(LineEvent event) { | |
| 204 | + eventDispatcher.sendAudioEvents(event, listeners); | |
| 205 | + } | |
| 206 | + | |
| 207 | + | |
| 208 | + /** | |
| 209 | + * This is an error in the API: getFramePosition | |
| 210 | + * should return a long value. At CD quality, | |
| 211 | + * the int value wraps around after 13 hours. | |
| 212 | + */ | |
| 213 | + public final int getFramePosition() { | |
| 214 | + return (int) getLongFramePosition(); | |
| 215 | + } | |
| 216 | + | |
| 217 | + | |
| 218 | + /** | |
| 219 | + * Return the frame position in a long value | |
| 220 | + * This implementation returns AudioSystem.NOT_SPECIFIED. | |
| 221 | + */ | |
| 222 | + public long getLongFramePosition() { | |
| 223 | + return AudioSystem.NOT_SPECIFIED; | |
| 224 | + } | |
| 225 | + | |
| 226 | + | |
| 227 | + // $$kk: 06.03.99: returns the mixer used in construction. | |
| 228 | + // this is a hold-over from when there was a public method like | |
| 229 | + // this on line and should be fixed!! | |
| 230 | + protected AbstractMixer getMixer() { | |
| 231 | + return mixer; | |
| 232 | + } | |
| 233 | + | |
| 234 | + protected EventDispatcher getEventDispatcher() { | |
| 235 | + return eventDispatcher; | |
| 236 | + } | |
| 237 | + | |
| 238 | + // ABSTRACT METHODS | |
| 239 | + | |
| 240 | + public abstract void open() throws LineUnavailableException; | |
| 241 | + public abstract void close(); | |
| 242 | +} | |