What is "xvimage"

XvImage is the X Window System X video extension client side storage mechanism for a X video extension pixel map. The structure of an XvImage as defined by the Addendum to the Xv Client library documentation is the following:

typedef struct {
int id; /* XvImageFormatValues id */
int width, height; /* The width and height of the image in pixels */
int data_size; /* The size of the data buffer in bytes */
int num_planes; /* The number of image planes */
int *pitches; /* An array of size num_planes indicating the scanline pitch */
/* in bytes. Each plane may have a different pitch */
int *offsets; /* An array of size num_planes indicating the byte offset */
/* from "data" to the start of each plane */
char *data; /* A pointer to the start of the data buffer */
XPointer obdata; /* A private field for holding SHM info. This field will be */
/* set up by the client libraries so the programmer will */
/* generally need not be concerned with this field */
} XvImage;