(Hope this is the right place to post this message.)
Hi all,
I am working on a small movie player which can play full screen movie
using Xserver. It works fine in Single Head Mode. But is I set the
Xserver in Dual Head Mode. I can't see any thing on both screens. The
Code to Init the display is shown as below:
display = XOpenDisplay(NULL);
if (display == NULL)
fprintf(stderr, "Can not open display\n");
if (!XMBXDHQueryExtension(display, &eventBase, &errorBase))
{
printf("XMBXDHQueryExtension failed\n");
exit(0);
}
if (!XMBXDHQueryVersion(display, &major, &minor, &patch) ||
major < 1 ||
minor < 0 ||
patch < 0)
{
printf("XMBXDHQueryVersion or version check failed\n");
exit(0);
}
if(!XMBXDHMode(display, MBX_DUAL_HEAD, PDP_DMT, 1))
{
printf("Can not Enter Dual Head Mode.\n");
exit(0);
}
int count = ScreenCount(display);
printf("number of screens = %d\n", count);
screen = DefaultScreen(display);
printf("screen = %d\n", screen);
hwidth = 640;
hheight = 480;
/* Make the window */
window = XCreateSimpleWindow (display, RootWindow(display, screen),
0, 0, hwidth, hheight,0,0,0);
XSelectInput(display, window, KeyPressMask | StructureNotifyMask);
/* Map window. */
XMapWindow(display, window);
/* Wait for map. */
do
{
XNextEvent(display, &xev);
}
while (xev.type != MapNotify || xev.xmap.event != window);
gc = DefaultGC(display, screen);
yuv_height = hheight;
yuv_width = hwidth;
XvQueryAdaptors(display, RootWindow(display, screen), &numAdaptors,
&info);
for(i = 0; i < numAdaptors; i++) {
if(info[i].type & XvImageMask) {
/* Adaptor has XvImage support */
formats = XvListImageFormats(display, info[i].base_id,
&numImages);
for(j = 0; j < numImages; j++) {
if(formats[j].id == GUID_MBX1_PLANAR) {
/* It supports our format */
adaptor = i;
for(k = 0; k < info[i].num_ports; k++) {
/* try to grab a port */
if(Success == XvGrabPort(display,
info[i].base_id + k,
CurrentTime))
{
portNum = info[i].base_id + k;
break;
}
}
}
if(portNum != -1) break;
}
XFree(formats);
}
}
if (adaptor == -1 ) {
printf("no suitable Xv adaptor found");
exit(1);
}
if (portNum == -1 ) {
printf("no free Xv adaptor ports found");
exit(1);
}
CompletionType = XShmGetEventBase(display) + ShmCompletion;
ximage = (XvImage *) XvShmCreateImage(display, portNum,
GUID_MBX1_PLANAR,0, yuv_width, yuv_height, (char *) &shminfo1);
shminfo1.shmid = shmget (IPC_PRIVATE, ximage->data_size,
IPC_CREAT|0777);
shminfo1.shmaddr = ximage->data = shmat (shminfo1.shmid, 0, 0);
shminfo1.readOnly = False;
if(!XShmAttach (display, &shminfo1)) {
printf("XShmAttach failed!\n");
}
shmctl (shminfo1.shmid, IPC_RMID, 0);
XSync(display,False);
I use tinyX as the Xserver and the xfbdev as the card for the second
screen. After the Initialization, Both Screen as a respond. I mean both
of them have been waked up. but when I am trying to write image to the
first screen by
XvShmPutImage(display, portNum,
window ,
gc, ximage, 0, 0,
yuv_width, yuv_height, 0, 0,
hwidth, hheight, False);
XFlush(display);
I got nothing. What did I forget to do to get this work?
Many thanks.
Regards.
Ken
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