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Java binding for the Gstreamer framework (0.10 compatible)
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/*
* Copyright (c) 2009 Tamas Korodi
* Copyright (c) 2010 Levente Farkas
*
* This file is part of gstreamer-java.
*
* This code is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3 only, as
* published by the Free Software Foundation.
*
* 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 Lesser General Public License
* version 3 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with this work. If not, see properties = new HashMap();
private boolean x11Events;
private long nativeHandle;
private boolean watcherRunning = false;
/**
* Overlay VideoComponent
* @param parent
* @param style
* @param enableX11Events true if X11 event should have to be grabbed (mouse move, enter and leave event on Linux).
*
* On Linux by default the handling of mouse move, enter and leave event are not propagated.
* Unfortunately the "handle-events" properties hide some important expose events too,
* sowe've to do some lowlevel trick to be able to get these events.
*/
public VideoComponent(final Composite parent, int style, boolean enableX11Events) {
super(parent, style | SWT.EMBEDDED);
x11Events = enableX11Events;
addDisposeListener(this);
Element colorspace = ElementFactory.make("ffmpegcolorspace", "colorspace" + counter);
Element videoscale = ElementFactory.make("videoscale", "videoscale" + counter);
autosink = (Bin)ElementFactory.make("autovideosink", "VideoComponent" + counter++);
sink.addMany(colorspace, videoscale, autosink);
Element.linkMany(colorspace, videoscale, autosink);
sink.addPad(new GhostPad("colorspace_sink_ghostpad", colorspace.getSinkPads().get(0)));
sinkListener = new ELEMENT_ADDED() {
public void elementAdded(Bin bin, Element element) {
if (element instanceof BaseSink) {
videosink = (BaseSink)element;
for (Map.Entry e : properties.entrySet())
videosink.set(e.getKey(), e.getValue());
// according to gstreamer docs:
// http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstxoverlay.html
// the overlay should have to be set from bus's SyncHandler,
// but we use autosink and in element-added the pipe already
// created so the windows must be prepared so we simple call
// the setOverlay and not the comment code bellow
// Bus bus = videosink.getBus();
// oldSyncHandler = bus.getSyncHandler();
// bus.setSyncHandler(VideoComponent.this); // for prepare-xwindow-id
setOverlay();
autosink.disconnect(this); // from element-added
sinkListener = null; // no longer needed
}
}
};
autosink.connect(sinkListener);
}
/**
* Overlay VideoComponent
* @param parent
* @param style
*/
public VideoComponent(final Composite parent, int style) {
this(parent, style, false);
}
@Override
public boolean setParent(final Composite parent) {
boolean ret = super.setParent(parent);
setOverlay();
return ret;
}
/**
* Dispose this Widget
*/
public void widgetDisposed(DisposeEvent arg0) {
if (sinkListener != null)
autosink.disconnect(sinkListener);
removeDisposeListener(this);
if (x11Events)
watcherRunning = false;
if (videosink != null && !videosink.getState().equals(State.NULL))
throw new IllegalStateException("Wrong state on dispose: " + videosink.getState() + " -> " + videosink.getName());
}
/**
* Set the overlay for this composite.
*/
private void setOverlay() {
nativeHandle = SWTOverlay.getNativeHandle(this);
overlay = SWTOverlay.wrap(videosink);
overlay.setWindowHandle(nativeHandle);
handleX11Events();
expose();
}
/**
* Implements the BusSyncHandler interface
* @param message
* @return
*/
public BusSyncReply syncMessage(Message message) {
if (message.getType() != MessageType.ELEMENT)
return BusSyncReply.PASS;
Structure s = message.getStructure();
if (s == null || !s.hasName("prepare-xwindow-id"))
return BusSyncReply.PASS;
setOverlay();
// videosink.getBus().setSyncHandler(oldSyncHandler);
return BusSyncReply.DROP;
}
/**
* Tell an overlay that it has been exposed. This will redraw the current frame
* in the drawable even if the pipeline is PAUSED.
*/
public void expose() {
getDisplay().asyncExec(new Runnable() {
public void run() {
if(!isDisposed() && (overlay != null))
overlay.expose();
}
});
}
/**
* Set the final sink's properties (or cache it until it'll be created).
*
* @param property
* @param data
*/
public void set(String property, Object data) {
properties.put(property, data);
if (videosink != null)
videosink.set(property, data);
}
/**
* Set to keep aspect ratio
*
* @param keepAspect
*/
public void setKeepAspect(boolean keepAspect) {
set("force-aspect-ratio", keepAspect);
}
/**
* Retrieves the Gstreamer element made for the video component
*
* @return element
*/
public Element getElement() {
return sink;
}
/**
* Retrieves the Gstreamer element used as sink in the video component
*
* @return element
*/
public Element getSinkElement() {
return videosink;
}
/**
* On Linux by default the handling of mouse move, enter and leave event are not propagated.
* Unfortunately the "handle-events" properties hide some important expose events too,
* sowe've to do some lowlevel trick to be able to get these events.
* In this case we (gstreamer-linux) must handle redraw too!
*
* @param enableX11Events true if X11 event should have to be grabbed (mouse move, enter and leave event on Linux).
*/
private void handleX11Events() {
if (x11Events && Platform.isLinux()) {
videosink.set("handle-events", !x11Events);
overlay.handleEvent(!x11Events);
watcherRunning = true;
new Thread() {
@Override
public void run() {
try {
final X11 x11 = X11.INSTANCE;
final Display display = x11.XOpenDisplay(null);
Window window = new Window(nativeHandle);
x11.XSelectInput(display, window,
new NativeLong(X11.ExposureMask |
X11.VisibilityChangeMask |
X11.StructureNotifyMask |
X11.FocusChangeMask |
//X11.PointerMotionMask |
X11.EnterWindowMask |
X11.LeaveWindowMask));
while (watcherRunning) {
final XEvent xEvent = new XEvent();
x11.XNextEvent(display, xEvent);
if (watcherRunning && !isDisposed()) {
getDisplay().asyncExec(new Runnable() {
public void run() {
if (watcherRunning && !isDisposed()) {
final Event swtEvent = new Event();
XCrossingEvent ce;
switch (xEvent.type) {
// case X11.MotionNotify:
// XMotionEvent e = (XMotionEvent)xEvent.readField("xmotion");
// swtEvent.x = e.x;
// swtEvent.y = e.y;
// notifyListeners(SWT.MouseMove, swtEvent);
// break;
case X11.EnterNotify:
ce = (XCrossingEvent)xEvent.readField("xcrossing");
swtEvent.x = ce.x;
swtEvent.y = ce.y;
notifyListeners(SWT.MouseEnter, swtEvent);
break;
case X11.LeaveNotify:
ce = (XCrossingEvent)xEvent.readField("xcrossing");
swtEvent.x = ce.x;
swtEvent.y = ce.y;
notifyListeners(SWT.MouseExit, swtEvent);
break;
default:
overlay.expose();
}
}
}
});
}
}
x11.XCloseDisplay(display);
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
}
}
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