JDK8/Java8源码在线阅读
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* 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
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package com.sun.media.sound;
import java.util.Vector;
import javax.sound.sampled.Control;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.Line;
import javax.sound.sampled.LineUnavailableException;
/**
* Abstract Mixer. Implements Mixer (with abstract methods) and specifies
* some other common methods for use by our implementation.
*
* @author Kara Kytle
*/
//$$fb 2002-07-26: let AbstractMixer be an AbstractLine and NOT an AbstractDataLine!
abstract class AbstractMixer extends AbstractLine implements Mixer {
// STATIC VARIABLES
protected static final int PCM = 0;
protected static final int ULAW = 1;
protected static final int ALAW = 2;
// IMMUTABLE PROPERTIES
/**
* Info object describing this mixer.
*/
private final Mixer.Info mixerInfo;
/**
* source lines provided by this mixer
*/
protected Line.Info[] sourceLineInfo;
/**
* target lines provided by this mixer
*/
protected Line.Info[] targetLineInfo;
/**
* if any line of this mixer is started
*/
private boolean started = false;
/**
* if this mixer had been opened manually with open()
* If it was, then it won't be closed automatically,
* only when close() is called manually.
*/
private boolean manuallyOpened = false;
/**
* Supported formats for the mixer.
*/
//$$fb DELETE
//protected Vector formats = new Vector();
// STATE VARIABLES
/**
* Source lines (ports) currently open
*/
private final Vector sourceLines = new Vector();
/**
* Target lines currently open.
*/
private final Vector targetLines = new Vector();
/**
* Constructs a new AbstractMixer.
* @param mixer the mixer with which this line is associated
* @param controls set of supported controls
*/
protected AbstractMixer(Mixer.Info mixerInfo,
Control[] controls,
Line.Info[] sourceLineInfo,
Line.Info[] targetLineInfo) {
// Line.Info, AbstractMixer, Control[]
super(new Line.Info(Mixer.class), null, controls);
// setup the line part
this.mixer = this;
if (controls == null) {
controls = new Control[0];
}
// setup the mixer part
this.mixerInfo = mixerInfo;
this.sourceLineInfo = sourceLineInfo;
this.targetLineInfo = targetLineInfo;
}
// MIXER METHODS
public final Mixer.Info getMixerInfo() {
return mixerInfo;
}
public final Line.Info[] getSourceLineInfo() {
Line.Info[] localArray = new Line.Info[sourceLineInfo.length];
System.arraycopy(sourceLineInfo, 0, localArray, 0, sourceLineInfo.length);
return localArray;
}
public final Line.Info[] getTargetLineInfo() {
Line.Info[] localArray = new Line.Info[targetLineInfo.length];
System.arraycopy(targetLineInfo, 0, localArray, 0, targetLineInfo.length);
return localArray;
}
public final Line.Info[] getSourceLineInfo(Line.Info info) {
int i;
Vector vec = new Vector();
for (i = 0; i < sourceLineInfo.length; i++) {
if (info.matches(sourceLineInfo[i])) {
vec.addElement(sourceLineInfo[i]);
}
}
Line.Info[] returnedArray = new Line.Info[vec.size()];
for (i = 0; i < returnedArray.length; i++) {
returnedArray[i] = (Line.Info)vec.elementAt(i);
}
return returnedArray;
}
public final Line.Info[] getTargetLineInfo(Line.Info info) {
int i;
Vector vec = new Vector();
for (i = 0; i < targetLineInfo.length; i++) {
if (info.matches(targetLineInfo[i])) {
vec.addElement(targetLineInfo[i]);
}
}
Line.Info[] returnedArray = new Line.Info[vec.size()];
for (i = 0; i < returnedArray.length; i++) {
returnedArray[i] = (Line.Info)vec.elementAt(i);
}
return returnedArray;
}
public final boolean isLineSupported(Line.Info info) {
int i;
for (i = 0; i < sourceLineInfo.length; i++) {
if (info.matches(sourceLineInfo[i])) {
return true;
}
}
for (i = 0; i < targetLineInfo.length; i++) {
if (info.matches(targetLineInfo[i])) {
return true;
}
}
return false;
}
public abstract Line getLine(Line.Info info) throws LineUnavailableException;
public abstract int getMaxLines(Line.Info info);
protected abstract void implOpen() throws LineUnavailableException;
protected abstract void implStart();
protected abstract void implStop();
protected abstract void implClose();
public final Line[] getSourceLines() {
Line[] localLines;
synchronized(sourceLines) {
localLines = new Line[sourceLines.size()];
for (int i = 0; i < localLines.length; i++) {
localLines[i] = (Line)sourceLines.elementAt(i);
}
}
return localLines;
}
public final Line[] getTargetLines() {
Line[] localLines;
synchronized(targetLines) {
localLines = new Line[targetLines.size()];
for (int i = 0; i < localLines.length; i++) {
localLines[i] = (Line)targetLines.elementAt(i);
}
}
return localLines;
}
/**
* Default implementation always throws an exception.
*/
public final void synchronize(Line[] lines, boolean maintainSync) {
throw new IllegalArgumentException("Synchronization not supported by this mixer.");
}
/**
* Default implementation always throws an exception.
*/
public final void unsynchronize(Line[] lines) {
throw new IllegalArgumentException("Synchronization not supported by this mixer.");
}
/**
* Default implementation always returns false.
*/
public final boolean isSynchronizationSupported(Line[] lines,
boolean maintainSync) {
return false;
}
// OVERRIDES OF ABSTRACT DATA LINE METHODS
/**
* This implementation tries to open the mixer with its current format and buffer size settings.
*/
public final synchronized void open() throws LineUnavailableException {
open(true);
}
/**
* This implementation tries to open the mixer with its current format and buffer size settings.
*/
final synchronized void open(boolean manual) throws LineUnavailableException {
if (Printer.trace) Printer.trace(">> AbstractMixer: open()");
if (!isOpen()) {
implOpen();
// if the mixer is not currently open, set open to true and send event
setOpen(true);
if (manual) {
manuallyOpened = true;
}
}
if (Printer.trace) Printer.trace("<< AbstractMixer: open() succeeded");
}
// METHOD FOR INTERNAL IMPLEMENTATION USE
/**
* The default implementation of this method just determines whether
* this line is a source or target line, calls open(no-arg) on the
* mixer, and adds the line to the appropriate vector.
* The mixer may be opened at a format different than the line's
* format if it is a DataLine.
*/
final synchronized void open(Line line) throws LineUnavailableException {
if (Printer.trace) Printer.trace(">> AbstractMixer: open(line = " + line + ")");
// $$kk: 06.11.99: ignore ourselves for now
if (this.equals(line)) {
if (Printer.trace) Printer.trace("<< AbstractMixer: open(" + line + ") nothing done");
return;
}
// source line?
if (isSourceLine(line.getLineInfo())) {
if (! sourceLines.contains(line) ) {
// call the no-arg open method for the mixer; it should open at its
// default format if it is not open yet
open(false);
// we opened successfully! add the line to the list
sourceLines.addElement(line);
}
} else {
// target line?
if(isTargetLine(line.getLineInfo())) {
if (! targetLines.contains(line) ) {
// call the no-arg open method for the mixer; it should open at its
// default format if it is not open yet
open(false);
// we opened successfully! add the line to the list
targetLines.addElement(line);
}
} else {
if (Printer.err) Printer.err("Unknown line received for AbstractMixer.open(Line): " + line);
}
}
if (Printer.trace) Printer.trace("<< AbstractMixer: open(" + line + ") completed");
}
/**
* Removes this line from the list of open source lines and
* open target lines, if it exists in either.
* If the list is now empty, closes the mixer.
*/
final synchronized void close(Line line) {
if (Printer.trace) Printer.trace(">> AbstractMixer: close(" + line + ")");
// $$kk: 06.11.99: ignore ourselves for now
if (this.equals(line)) {
if (Printer.trace) Printer.trace("<< AbstractMixer: close(" + line + ") nothing done");
return;
}
sourceLines.removeElement(line);
targetLines.removeElement(line);
if (Printer.debug) Printer.debug("AbstractMixer: close(line): sourceLines.size() now: " + sourceLines.size());
if (Printer.debug) Printer.debug("AbstractMixer: close(line): targetLines.size() now: " + targetLines.size());
if (sourceLines.isEmpty() && targetLines.isEmpty() && !manuallyOpened) {
if (Printer.trace) Printer.trace("AbstractMixer: close(" + line + "): need to close the mixer");
close();
}
if (Printer.trace) Printer.trace("<< AbstractMixer: close(" + line + ") succeeded");
}
/**
* Close all lines and then close this mixer.
*/
public final synchronized void close() {
if (Printer.trace) Printer.trace(">> AbstractMixer: close()");
if (isOpen()) {
// close all source lines
Line[] localLines = getSourceLines();
for (int i = 0; i<localLines.length; i++) {
localLines[i].close();
}
// close all target lines
localLines = getTargetLines();
for (int i = 0; i<localLines.length; i++) {
localLines[i].close();
}
implClose();
// set the open state to false and send events
setOpen(false);
}
manuallyOpened = false;
if (Printer.trace) Printer.trace("<< AbstractMixer: close() succeeded");
}
/**
* Starts the mixer.
*/
final synchronized void start(Line line) {
if (Printer.trace) Printer.trace(">> AbstractMixer: start(" + line + ")");
// $$kk: 06.11.99: ignore ourselves for now
if (this.equals(line)) {
if (Printer.trace) Printer.trace("<< AbstractMixer: start(" + line + ") nothing done");
return;
}
// we just start the mixer regardless of anything else here.
if (!started) {
if (Printer.debug) Printer.debug("AbstractMixer: start(line): starting the mixer");
implStart();
started = true;
}
if (Printer.trace) Printer.trace("<< AbstractMixer: start(" + line + ") succeeded");
}
/**
* Stops the mixer if this was the last running line.
*/
final synchronized void stop(Line line) {
if (Printer.trace) Printer.trace(">> AbstractMixer: stop(" + line + ")");
// $$kk: 06.11.99: ignore ourselves for now
if (this.equals(line)) {
if (Printer.trace) Printer.trace("<< AbstractMixer: stop(" + line + ") nothing done");
return;
}
Vector localSourceLines = (Vector)sourceLines.clone();
for (int i = 0; i < localSourceLines.size(); i++) {
// if any other open line is running, return
// this covers clips and source data lines
if (localSourceLines.elementAt(i) instanceof AbstractDataLine) {
AbstractDataLine sourceLine = (AbstractDataLine)localSourceLines.elementAt(i);
if ( sourceLine.isStartedRunning() && (!sourceLine.equals(line)) ) {
if (Printer.trace) Printer.trace("<< AbstractMixer: stop(" + line + ") found running sourceLine: " + sourceLine);
return;
}
}
}
Vector localTargetLines = (Vector)targetLines.clone();
for (int i = 0; i < localTargetLines.size(); i++) {
// if any other open line is running, return
// this covers target data lines
if (localTargetLines.elementAt(i) instanceof AbstractDataLine) {
AbstractDataLine targetLine = (AbstractDataLine)localTargetLines.elementAt(i);
if ( targetLine.isStartedRunning() && (!targetLine.equals(line)) ) {
if (Printer.trace) Printer.trace("<< AbstractMixer: stop(" + line + ") found running targetLine: " + targetLine);
return;
}
}
}
// otherwise, stop
if (Printer.debug) Printer.debug("AbstractMixer: stop(line): stopping the mixer");
started = false;
implStop();
if (Printer.trace) Printer.trace("<< AbstractMixer: stop(" + line + ") succeeded");
}
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