XvGetVideo(3X)

Name
XvGetVideo - capture video from a drawable

Syntax
include Xvlib.h

XvGetVideo(dpy, port, d, gc, vx, vy, vw, vh, dx, dy, dw, dh)

register Display *dpy;
XvPortID port;
Drawable d;
GC gc;
int vx, vy, dx, dy;
unsigned int vw, vh;
unsigned int dw, dh;

Arguments

dpy Specifies the display screen on which the Xv Server is to accept requests from Xv clients. If the display option is not specified, Xv uses the display screen specified by your DISPLAY environment variable. The display option has the format hostname:number. Using two colons (::) instead of one (:) indicates that DECnet is to be used for transport.

port
    Defines the port to which video output is sent.

d   Defines the drawable (window) from which video output is to be obtained.

gc  Defines the graphical context. GC components are: subwindow-mode, clip-x-origin, clip-y-origin, and clip-mask.

vx,vy,vw,vh
    Define the location and size of the video region is to be written. vx and vy define the x and y coordinates of the upper-left corner of the video region; vw and vh define the width and height, in pixels, of the video region.

dx,dy,dw,dh
    Define the location of the source drawable from which the video image is to be taken. dx and dy define the x and y coordinates of the upper-left corner of the drawable region; dw and dh define the width and height, in pixels, of the drawable region.

Description
outputs video from a drawable. The position and size of the destination rectangle is specified by vx, vy, vw, and vh. The position and size of the source rectangle is specified by dx, dy, dw, and dh.

Drawable data is clipped to the bounds of the drawable, scaled to the requested video region size (or the closest size supported) and clipped to the bounds of the video encoding. The contents of any region not updated with drawable data is undefined.

If video is successfully initiated, an XvVideoNotify event with detail XvStarted is generated for the drawable. If the port is already in use, its video is preempted, and if the new drawable is different than the old, an XvVideoNotify event with detail XvPreempted is generated for the old drawable. If the port is grabbed by another client, this request is ignored, and an XvVideoNotify event with detail XvBusy is generated for the drawable.

Returned Values

[Success]
    Returned if XvGetVideo(3X) completed successfully.

[XvBadExtension]
    Returned if the Xv extension is unavailable.

[XvBadAlloc]
    Returned if XvGetVideo(3X) failed to allocate memory to process the request.

Diagnostics

[XvBadPort]
    Generated if the requested port does not exist.

[BadGC]
    Generated if the requested graphics context does not exist.

[BadDrawable]
    Generated if the requested drawable does not exist.

[BadAlloc]
    Generated if there were insufficient resources to process the request.

See Also
XvGetStill(3X), XvPutVideo(3X), XvVideoNotify(3X)