NAME¶
XvGrabPort - lock port for exclusive use by client
SYNOPSIS¶
#include <X11/extensions/Xvlib.h>
int XvGrabPort(Display *dpy, XvPortID port, Time time);
ARGUMENTS¶
- dpy
- Specifies the connection to the X server.
- port
- Defines the port to be grabbed.
- time
- Specifies the request timestamp.
DESCRIPTION¶
XvGrabPort(3) grabs a port. Once a client grabs a port, only that client
can make video requests to that port.
If the time is before the current port time, the XvGrabPort request is ignored
and XvInvalidTime is returned. If the port is already grabbed by another
client, XvAlreadyGrabbed is returned. Otherwise it returns a status of
Success. The port time is updated when the following requests are
processed:
XvGrabPort(3),
XvUngrabPort(3),
XvPutVideo(3),
XvPutStill(3),
XvGetVideo(3),
XvGetStill(3).
If the port is actively processing video for another client, the video is
preempted, and an XvVideoNotify event with detail XvPreempted is generated for
its drawable.
RETURN VALUES¶
- [Success]
- Returned if XvGrabPort(3) completed successfully.
- [XvInvalidTime]
- Returned if requested time is older than the current port time.
- [XvAlreadyGrabbed]
- Returned if the port is already grabbed by another client.
- [XvBadExtension]
- Returned if the Xv extension is unavailable.
- [XvBadAlloc]
- Returned if XvGrabPort(3) failed to allocate memory to process the
request.
DIAGNOSTICS¶
- [XvBadPort]
- Generated if the requested port does not exist.
SEE ALSO¶
XvUngrabPort(3),
XvVideoNotify(3)