(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
