Hi,
4 Feb 2007 19:47:02 +0100, Tim Teulings <[EMAIL PROTECTED]>:
Hallo!
Subject says it all:
Does the camera in the N800 support the X11 Xv extension, that mean can
I use this extension for displaying images of the camera or must I use
v4l V2 (what about the V1 interface) or gstreamer?
I did a small test, see code below. And it seem you must use the gstreamer or
the v4l grabber unfortunately (lets hope the next version has XvPutVideo for
this device, or I made a mistake :-) ).
(note I had to comment out the XvInputMask check to get output at all)
$ g++ -o xvtest xvtest.cpp -lX11 -lXv
$ run-standalone.sh ./xvtest
xvport 56
XV_COLORKEY[72] (0 .. 65535) current: 1091
XV_OMAP_DOWNSCALING[73] (0 .. 2) current: 1
XV_OMAP_VSYNC[74] (0 .. 2) current: 1
#include <stdio.h>
#include <string.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xvlib.h>
int main (int argc, char ** argv) {
Display * display = XOpenDisplay(NULL);
int screen = XDefaultScreen(display);
unsigned int ver, rel, req, evb, err;
if (XvQueryExtension (display, &ver, &rel, &req, &evb, &err) != Success) {
fprintf (stderr, "XVideo not supported on display\n");
XCloseDisplay (display);
return 1;
}
XvAdaptorInfo * ai;
unsigned int adaptors;
bool xv_success = true;
if (XvQueryAdaptors (display, XDefaultRootWindow (display),
&adaptors, &ai) == Success) {
for (unsigned i = 0; i < adaptors; i++) {
//if ((ai[i].type & XvInputMask) &&
// (ai[i].type & XvVideoMask) &&
// ai[i].base_id > 0) {
int port = ai[i].base_id;
fprintf (stderr, "xvport %d\n", port);
bool freq_found = false;
XvAttribute *attributes = 0L;
int nr_attr, cur_val;
attributes = XvQueryPortAttributes (display, port, &nr_attr);
if (attributes) {
for (int i = 0; i < nr_attr; i++) {
if (!strcmp (attributes[i].name, "XV_FREQ"))
freq_found = true;
Atom atom = XInternAtom (display, attributes[i].name, false);
fprintf (stderr, "%s[%d] (%d .. %d)", attributes[i].name, ( int ) at
om, attributes[i].min_value, attributes[i].max_value);
if ((attributes[i].flags & XvGettable) &&
XvGetPortAttribute (displa
y, port, atom, &cur_val) == Success)
fprintf (stderr, " current: %d", cur_val);
fprintf (stderr, "\n");
}
XFree(attributes);
}
XvEncodingInfo * encodings = 0L;
unsigned nr_encode;
XvQueryEncodings (display, port, &nr_encode, &encodings);
if (encodings) {
for (unsigned i = 0; i < nr_encode; i++) {
if (strcmp (encodings[i].name, "XV_IMAGE"))
fprintf (stderr, " encoding: %d %s dim %d %d\n", ( int )
encodings[i].encoding_id, encodings[i].name, encodings[i].width,
encodings[i].height);
}
}
XvFreeEncodingInfo (encodings);
//}
}
}
XvFreeAdaptorInfo(ai);
XCloseDisplay (display);
return 0;
}
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