/**
* Read screen and store result in native buffer.
*
* @param dim dimension of the video
* @return true if success, false otherwise
*/
private ByteBuffer readScreenNative(Dimension dim) {
int size = dim.width * dim.height * 4 + FFmpeg.FF_INPUT_BUFFER_PADDING_SIZE;
ByteBuffer data = byteBufferPool.getBuffer(size);
data.setLength(size);
/* get desktop screen via native grabber */
boolean b;
try {
b =
desktopInteract.captureScreen(
displayIndex, x, y, dim.width, dim.height, data.getPtr(), data.getLength());
} catch (Throwable t) {
if (t instanceof ThreadDeath) {
throw (ThreadDeath) t;
} else {
b = false;
// logger.error("Failed to grab screen!", t);
}
}
if (!b) {
data.free();
data = null;
}
return data;
}
/**
* Read screen.
*
* @param output output buffer for screen bytes
* @param dim dimension of the screen
* @return raw bytes, it could be equal to output or not. Take care in the caller to check if
* output is the returned value.
*/
public byte[] readScreen(byte[] output, Dimension dim) {
VideoFormat format = (VideoFormat) getFormat();
Dimension formatSize = format.getSize();
int width = formatSize.width;
int height = formatSize.height;
BufferedImage scaledScreen = null;
BufferedImage screen = null;
byte data[] = null;
int size = width * height * 4;
// If output is not large enough, enlarge it.
if ((output == null) || (output.length < size)) output = new byte[size];
/* get desktop screen via native grabber if available */
if (desktopInteract.captureScreen(displayIndex, x, y, dim.width, dim.height, output)) {
return output;
}
System.out.println("failed to grab with native! " + output.length);
/* OK native grabber failed or is not available,
* try with AWT Robot and convert it to the right format
*
* Note that it is very memory consuming since memory are allocated
* to capture screen (via Robot) and then for converting to raw bytes
* Moreover support for multiple display has not yet been investigated
*
* Normally not of our supported platform (Windows (x86, x64),
* Linux (x86, x86-64), Mac OS X (i386, x86-64, ppc) and
* FreeBSD (x86, x86-64) should go here.
*/
screen = desktopInteract.captureScreen();
if (screen != null) {
/* convert to ARGB BufferedImage */
scaledScreen =
ImgStreamingUtils.getScaledImage(screen, width, height, BufferedImage.TYPE_INT_ARGB);
/* get raw bytes */
data = ImgStreamingUtils.getImageBytes(scaledScreen, output);
}
screen = null;
scaledScreen = null;
return data;
}