org.jitsi.impl.neomedia.imgstreaming

Class DesktopInteractImpl

java.lang.Object

org.jitsi.impl.neomedia.imgstreaming.DesktopInteractImpl

All Implemented Interfaces:

DesktopInteract

public class DesktopInteractImpl
extends Object
implements DesktopInteract

Capture desktop screen either via native code (JNI) if available or by using java.awt.Robot.

Author:

Sebastien Vincent

See Also:

Robot

Constructor Summary

Constructors

Constructor and Description
DesktopInteractImpl() Constructor.

Method Summary

Modifier and Type	Method and Description
BufferedImage	captureScreen() Capture the full desktop screen using java.awt.Robot.
boolean	captureScreen(int display, byte[] output) Capture the full desktop screen using native grabber.
BufferedImage	captureScreen(int x, int y, int width, int height) Capture a part of the desktop screen using java.awt.Robot.
boolean	captureScreen(int display, int x, int y, int width, int height, byte[] output) Capture a part of the desktop screen using native grabber.
boolean	captureScreen(int display, int x, int y, int width, int height, long buffer, int bufferLength) Capture a part of the desktop screen using native grabber.
boolean	captureScreen(int display, long buffer, int bufferLength) Capture the full desktop screen using native grabber.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DesktopInteractImpl

public DesktopInteractImpl()
                    throws AWTException,
                           SecurityException

Constructor.

Throws:

AWTException - if platform configuration does not allow low-level input control

SecurityException - if Robot creation is not permitted

Method Detail

captureScreen

public boolean captureScreen(int display,
                             byte[] output)

Capture the full desktop screen using native grabber. Contrary to other captureScreen method, it only returns raw bytes and not BufferedImage. It is done in order to limit slow operation such as converting ARGB images (uint32_t) to bytes especially for big big screen. For example a 1920x1200 desktop consumes 9 MB of memory for grabbing and another 9 MB array for conversion operation.

Specified by:

captureScreen in interface DesktopInteract

Parameters:

display - index of display

output - output buffer to store bytes in. Be sure that output length is sufficient

Returns:

true if success, false if JNI error or output length too short

captureScreen

public boolean captureScreen(int display,
                             long buffer,
                             int bufferLength)

Capture the full desktop screen using native grabber. Contrary to other captureScreen method, it only returns raw bytes and not BufferedImage. It is done in order to limit slow operation such as converting ARGB images (uint32_t) to bytes especially for big big screen. For example a 1920x1200 desktop consumes 9 MB of memory for grabbing and another 9 MB array for conversion operation.

Specified by:

captureScreen in interface DesktopInteract

Parameters:

display - index of display

buffer - native output buffer to store bytes in. Be sure that output length is sufficient

bufferLength - length of native buffer

Returns:

true if success, false if JNI error or output length too short

captureScreen

public boolean captureScreen(int display,
                             int x,
                             int y,
                             int width,
                             int height,
                             byte[] output)

Capture a part of the desktop screen using native grabber. Contrary to other captureScreen method, it only returns raw bytes and not BufferedImage. It is done in order to limit slow operation such as converting ARGB images (uint32_t) to bytes especially for big big screen. For example a 1920x1200 desktop consumes 9 MB of memory for grabbing and another 9 MB array for conversion operation.

Specified by:

captureScreen in interface DesktopInteract

Parameters:

display - index of display

x - x position to start capture

y - y position to start capture

width - capture width

height - capture height

output - output buffer to store bytes in. Be sure that output length is sufficient

Returns:

true if success, false if JNI error or output length too short

captureScreen

public boolean captureScreen(int display,
                             int x,
                             int y,
                             int width,
                             int height,
                             long buffer,
                             int bufferLength)

Capture a part of the desktop screen using native grabber. Contrary to other captureScreen method, it only returns raw bytes and not BufferedImage. It is done in order to limit slow operation such as converting ARGB images (uint32_t) to bytes especially for big big screen. For example a 1920x1200 desktop consumes 9 MB of memory for grabbing and another 9 MB array for conversion operation.

Specified by:

captureScreen in interface DesktopInteract

Parameters:

display - index of display

x - x position to start capture

y - y position to start capture

width - capture width

height - capture height

buffer - native output buffer to store bytes in. Be sure that output length is sufficient

bufferLength - length of native buffer

Returns:

true if success, false if JNI error or output length too short

captureScreen

public BufferedImage captureScreen()

Capture the full desktop screen using java.awt.Robot.

Specified by:

captureScreen in interface DesktopInteract

Returns:

BufferedImage of the desktop screen

captureScreen

public BufferedImage captureScreen(int x,
                                   int y,
                                   int width,
                                   int height)

Capture a part of the desktop screen using java.awt.Robot.

Specified by:

captureScreen in interface DesktopInteract

Parameters:

x - x position to start capture

y - y position to start capture

width - capture width

height - capture height

Returns:

BufferedImage of a part of the desktop screen or null if Robot problem