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Java binding for the Gstreamer framework
/*
* Copyright (c) 2007 Wayne Meissner
*
* 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 openglHints = new HashMap() {
private static final long serialVersionUID = 3418333891389270949L;
{
// Bilinear interpolation can be accelerated by the OpenGL pipeline
put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
}};
private final static Map defaultHints = new HashMap() {
private static final long serialVersionUID = -3297248815157630205L;
{
// Bilinear interpolation can be accelerated by the D3D pipeline
put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
}};
static {
quartzEnabled = Boolean.getBoolean("apple.awt.graphics.UseQuartz");
try {
ddscaleEnabled = Boolean.getBoolean("sun.java2d.ddscale")
&& Boolean.getBoolean("sun.java2d.d3d");
} catch (Exception ex) { }
Class cls;
try {
cls = Class.forName("sun.java2d.opengl.OGLGraphicsConfig");
} catch (Exception ex) {
cls = null;
}
oglGraphicsConfigClass = cls;
}
/** Creates a new instance of GstVideoComponent */
public VideoComponent() {
videosink = new RGBDataSink("GstVideoComponent", new RGBListener());
videosink.setPassDirectBuffer(true);
// Limit the lateness of frames to no more than 20ms (half a frame at 25fps)
videosink.getSinkElement().setMaximumLateness(20, TimeUnit.MILLISECONDS);
videosink.getSinkElement().setQOSEnabled(true);
// On MacOS, swing is un-accelerated, so using volatile actually slows it down a bit
useVolatile = !Platform.isMac();
// Get the pad to use to send events on
videoPad = videosink.getSinkPads().get(0);
//
// Kick off a timer to free up the volatile image if there have been no recent updates
// (e.g. the player is paused)
//
resourceTimer = new Timer(250, resourceReaper);
//
// Don't use a layout manager - the output component will positioned within this
// component according to the aspect ratio and scaling mode
//
setLayout(null);
add(renderComponent);
//
// Listen for the child changing its preferred size to the size of the
// video stream.
//
renderComponent.addPropertyChangeListener("preferredSize", new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
setPreferredSize(renderComponent.getPreferredSize());
scaleVideoOutput();
}
});
renderComponent.addMouseListener(mouseListener);
renderComponent.addMouseMotionListener(mouseListener);
renderComponent.addKeyListener(keyListener);
addKeyListener(keyListener);
//
// Scale the video output in response to this component being resized
//
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent arg0) {
scaleVideoOutput();
}
});
renderComponent.setBounds(getBounds());
setOpaque(true);
setBackground(Color.BLACK);
}
private final MouseInputListener mouseListener = new MouseInputAdapter() {
/**
* Gets the scaled X position of the mouse event.
*/
private double getX(MouseEvent evt) {
double scaleX = (double) imgWidth / (double) renderComponent.getWidth();
return (double) evt.getX() * scaleX;
}
/**
* Gets the scaled Y position of the mouse event.
*/
private double getY(MouseEvent evt) {
double scaleY = (double) imgHeight / (double) renderComponent.getHeight();
return (double) evt.getY() * scaleY;
}
/**
* Generate and send a mouse event to the peer pad of the video component.
*/
private void mouse(String event, MouseEvent evt) {
// System.out.printf("%s (%d, %d) button=%x\n", event, evt.getX(), evt.getY(), evt.getButton());
NavigationEvent nav = NavigationEvent.createMouseEvent(event, getX(evt), getY(evt),
evt.getButton());
videoPad.pushEvent(nav);
}
@Override
public void mousePressed(MouseEvent evt) {
mouse("mouse-button-press", evt);
}
@Override
public void mouseReleased(MouseEvent evt) {
mouse("mouse-button-release", evt);
}
@Override
public void mouseMoved(MouseEvent evt) {
mouse("mouse-move", evt);
}
@Override
public void mouseDragged(MouseEvent evt) {
mouse("mouse-move", evt);
}
};
// Map from some java key codes to X11 keysym names.
private static final Map keyMap = new HashMap() {
private static final long serialVersionUID = 9001444546596702473L;
{
put(KeyEvent.VK_BACK_SPACE, "BackSpace");
put(KeyEvent.VK_ENTER, "Return");
put(KeyEvent.VK_LEFT, "Left");
put(KeyEvent.VK_RIGHT, "Right");
put(KeyEvent.VK_UP, "Up");
put(KeyEvent.VK_DOWN, "Down");
put(KeyEvent.VK_ESCAPE, "Escape");
put(KeyEvent.VK_COMMA, "comma");
put(KeyEvent.VK_PERIOD, "period");
put(KeyEvent.VK_SPACE, "space");
}};
private final KeyListener keyListener = new KeyAdapter() {
private String getKey(KeyEvent evt) {
if (keyMap.containsKey(evt.getKeyCode())) {
return keyMap.get(evt.getKeyCode());
}
return String.valueOf(evt.getKeyChar());
}
private void key(String name, KeyEvent evt) {
// System.out.println(name + " " + getKey(evt));
videoPad.pushEvent(NavigationEvent.createKeyEvent(name, getKey(evt)));
evt.consume();
}
public void keyPressed(KeyEvent evt) {
key("key-press", evt);
}
public void keyReleased(KeyEvent evt) {
key("key-release", evt);
}
};
private void updateRenderingHints(Class gcClass) {
Map hints = new HashMap();
if (gcClass != null && oglGraphicsConfigClass != null &&
oglGraphicsConfigClass.isAssignableFrom(gcClass)) {
hints.putAll(openglHints);
} else if (quartzEnabled) {
//hints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
hints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
hints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
} else if (ddscaleEnabled) {
hints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
} else {
hints.putAll(defaultHints);
}
renderingHints = new RenderingHints(hints);
}
/**
* Scales the video output component according to its aspect ratio
*/
private void scaleVideoOutput() {
final Component child = renderComponent;
final Dimension childSize = child.getPreferredSize();
final int width = getWidth(), height = getHeight();
// Figure out the aspect ratio
double aspect = keepAspect ? (double) childSize.width / (double) childSize.height : 1.0f;
//
// Now scale and position the videoChild component to be in the correct position
// to keep the aspect ratio correct.
//
int scaledHeight = (int)((double) width / aspect);
if (!keepAspect) {
//
// Just make the child match the parent
//
child.setBounds(0, 0, width, height);
} else if (scaledHeight < height) {
//
// Output window is taller than the image is when scaled, so move the
// video component to sit vertically in the centre of the VideoComponent.
//
final int y = (height - scaledHeight) / 2;
child.setBounds(0, y, width, scaledHeight);
} else {
final int scaledWidth = (int)((double) height * aspect);
final int x = (width - scaledWidth) / 2;
child.setBounds(x, 0, scaledWidth, height);
}
}
private ActionListener resourceReaper = new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if (!frameRendered) {
if (volatileImage != null) {
volatileImage.flush();
volatileImage = null;
}
frameRendered = false;
// Stop the timer so we don't wakeup needlessly
resourceTimer.stop();
}
}
};
public Element getElement() {
return videosink;
}
public void setKeepAspect(boolean keepAspect) {
this.keepAspect = keepAspect;
}
@Override
public boolean isLightweight() {
return true;
}
@Override
public boolean isOpaque() {
return super.isOpaque() && alpha >= 1.0f;
}
@Override
protected void paintComponent(Graphics g) {
if (isOpaque()) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(getBackground());
if (alpha < 1.0f) {
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
}
g2d.fillRect(0, 0, getWidth(), getHeight());
g2d.dispose();
}
}
private class RenderComponent extends javax.swing.JComponent {
private static final long serialVersionUID = -4736605073704494268L;
@Override
protected void paintComponent(Graphics g) {
int width = getWidth(), height = getHeight();
Graphics2D g2d = (Graphics2D) g.create();
if (alpha < 1.0f) {
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
}
if (currentImage != null) {
GraphicsConfiguration gc = getGraphicsConfiguration();
// If the GraphicsConfig changed, then change the hints being used
if (gc.getClass() != graphicsConfigClass) {
graphicsConfigClass = gc.getClass();
updateRenderingHints(graphicsConfigClass);
}
if (!renderingHints.isEmpty()) {
g2d.setRenderingHints(renderingHints);
}
render(g2d, 0, 0, width, height);
} else if (alpha >= 1.0f) {
g2d.setColor(getBackground());
g2d.fillRect(0, 0, width, height);
}
g2d.dispose();
}
@Override
public boolean isOpaque() {
return VideoComponent.this.isOpaque();
}
@Override
public boolean isLightweight() {
return true;
}
}
@Deprecated
public void setAlpha(float alpha) {
this.alpha = alpha;
}
@Deprecated
public float getAlpha() {
return alpha;
}
public void setOpacity(float opacity) {
this.alpha = opacity;
}
public float getOpacity() {
return alpha;
}
private void renderVolatileImage(BufferedImage bufferedImage) {
do {
int w = bufferedImage.getWidth(), h = bufferedImage.getHeight();
GraphicsConfiguration gc = getGraphicsConfiguration();
if (volatileImage == null || volatileImage.getWidth() != w
|| volatileImage.getHeight() != h
|| volatileImage.validate(gc) == VolatileImage.IMAGE_INCOMPATIBLE) {
if (volatileImage != null) {
volatileImage.flush();
}
volatileImage = gc.createCompatibleVolatileImage(w, h);
volatileImage.setAccelerationPriority(1.0f);
}
//
// Now paint the BufferedImage into the accelerated image
//
Graphics2D g = volatileImage.createGraphics();
g.drawImage(bufferedImage, 0, 0, null);
g.dispose();
} while (volatileImage.contentsLost());
}
/**
* Renders to a volatile image, and then paints that to the screen.
* This helps with scaling performance on accelerated surfaces (e.g. OpenGL)
*
* @param g the graphics to paint the image to
* @param x the left coordinate to start painting at.
* @param y the top coordinate to start painting at.
* @param w the width of the paint area
* @param h the height of the paint area
*/
private void volatileRender(Graphics g, int x, int y, int w, int h) {
do {
if (updatePending || volatileImage == null
|| volatileImage.validate(getGraphicsConfiguration()) != VolatileImage.IMAGE_OK) {
bufferLock.lock();
try {
updatePending = false;
renderVolatileImage(currentImage);
} finally {
bufferLock.unlock();
}
}
g.drawImage(volatileImage, x, y, w, h, null);
} while (volatileImage.contentsLost());
}
/**
* Renders directly to the given Graphics.
* This is only really useful on MacOS where swing graphics are unaccelerated
* so using a volatile just incurs an extra memcpy().
*
* @param g the graphics to paint the image to
* @param x the left coordinate to start painting at.
* @param y the top coordinate to start painting at.
* @param w the width of the paint area
* @param h the height of the paint area
*/
private void heapRender(Graphics g, int x, int y, int w, int h) {
bufferLock.lock();
try {
updatePending = false;
g.drawImage(currentImage, x, y, w, h, null);
} finally {
bufferLock.unlock();
}
}
/**
* Renders the current frame to the given Graphics.
*
* @param g the graphics to paint the image to
* @param x the left coordinate to start painting at.
* @param y the top coordinate to start painting at.
* @param w the width of the paint area
* @param h the height of the paint area
*/
private void render(Graphics g, int x, int y, int w, int h) {
if (useVolatile) {
volatileRender(g, x, y, w, h);
} else {
heapRender(g, x, y, w, h);
}
//
// Restart the resource reaper timer if neccessary
//
if (!frameRendered) {
frameRendered = true;
if (!resourceTimer.isRunning()) {
resourceTimer.restart();
}
}
}
private int imgWidth = 0, imgHeight = 0;
private final void update(final int width, final int height) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
//
// If the image changed size, resize the component to fit
//
if (width != imgWidth || height != imgHeight) {
renderComponent.setPreferredSize(new Dimension(width, height));
imgWidth = width;
imgHeight = height;
}
if (renderComponent.isVisible()) {
renderComponent.paintImmediately(0, 0,
renderComponent.getWidth(), renderComponent.getHeight());
}
}
});
}
private BufferedImage getBufferedImage(int width, int height) {
if (currentImage != null && currentImage.getWidth() == width
&& currentImage.getHeight() == height) {
return currentImage;
}
if (currentImage != null) {
currentImage.flush();
}
currentImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
currentImage.setAccelerationPriority(0.0f);
return currentImage;
}
private class RGBListener implements RGBDataSink.Listener {
public void rgbFrame(boolean isPrerollFrame, int width, int height, IntBuffer rgb) {
// If the EDT is still copying data from the buffer, just drop this frame
//
if (!bufferLock.tryLock()) {
return;
}
//
// If there is already a swing update pending, also drop this frame.
//
if (updatePending && !isPrerollFrame) {
bufferLock.unlock();
return;
}
try {
final BufferedImage renderImage = getBufferedImage(width, height);
int[] pixels = ((DataBufferInt) renderImage.getRaster().getDataBuffer()).getData();
rgb.get(pixels, 0, width * height);
updatePending = true;
} finally {
bufferLock.unlock();
}
int scaledWidth = currentImage.getWidth();
if (keepAspect) {
// Scale width according to pixel aspect ratio.
Caps videoCaps = videoPad.getNegotiatedCaps();
Structure capsStruct = videoCaps.getStructure(0);
if (capsStruct.hasField("pixel-aspect-ratio")) {
Fraction pixelAspectRatio = capsStruct.getFraction("pixel-aspect-ratio");
scaledWidth = scaledWidth * pixelAspectRatio.getNumerator() / pixelAspectRatio.getDenominator();
}
}
// Tell swing to use the new buffer
update(scaledWidth, currentImage.getHeight());
}
}
}