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authorThomas Hellstrom <unichrome@shipmail.org>2004-11-13 11:09:23 +0000
committerThomas Hellstrom <unichrome@shipmail.org>2004-11-13 11:09:23 +0000
commit120c3035f60138ad15599b0b0c4468400e966423 (patch)
tree3c7629856e70c877689e7cb158bfcc9eb8c7bcd5 /src/XvMC.c
parent0077c785f91a80d48216a969757bc3f3b607e7e2 (diff)
lib/XvMC/Imake
Added support for automatic loading of the correct hardware XvMC driver. This involves a protocol extension of the XvMC protocol. The XvMC revision number was bumped.
Diffstat (limited to 'src/XvMC.c')
-rw-r--r--src/XvMC.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/XvMC.c b/src/XvMC.c
index f63e278..e022ad9 100644
--- a/src/XvMC.c
+++ b/src/XvMC.c
@@ -4,6 +4,12 @@
#include <stdio.h>
#include "XvMClibint.h"
+#ifdef HAS_SHM
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#endif
+#include <unistd.h>
+#include <sys/time.h>
#include <X11/extensions/Xext.h>
#include <X11/extensions/extutil.h>
@@ -465,3 +471,124 @@ Status _xvmc_destroy_subpicture(
return Success;
}
+Status XvMCGetDRInfo(Display *dpy, XvPortID port,
+ char **name, char **busID,
+ int *major, int *minor,
+ int *patchLevel,
+ int *isLocal)
+{
+ XExtDisplayInfo *info = xvmc_find_display(dpy);
+ xvmcGetDRInfoReply rep;
+ xvmcGetDRInfoReq *req;
+ char *tmpBuf = NULL;
+ CARD32 magic;
+
+#ifdef HAS_SHM
+ volatile CARD32 *shMem;
+ struct timezone here;
+ struct timeval now;
+ here.tz_minuteswest = 0;
+ here.tz_dsttime = 0;
+#endif
+
+ XvMCCheckExtension (dpy, info, BadImplementation);
+
+ LockDisplay (dpy);
+ XvMCGetReq (GetDRInfo, req);
+
+ req->port = port;
+ magic = 0;
+ req->magic = 0;
+#ifdef HAS_SHM
+ req->shmKey = shmget(IPC_PRIVATE, getpagesize(), IPC_CREAT | 0600);
+
+ /*
+ * We fill a shared memory page with a repetitive pattern. If the
+ * X server can read this pattern, we probably have a local connection.
+ * Note that we can trigger the remote X server to read any shared
+ * page on the remote machine, so we shouldn't be able to guess and verify
+ * any complicated data on those pages. Thats the explanation of this
+ * otherwise stupid-looking pattern algorithm.
+ */
+
+ if (req->shmKey >= 0) {
+ shMem = (CARD32 *) shmat(req->shmKey, 0, 0);
+ shmctl( req->shmKey, IPC_RMID, 0);
+ if ( shMem ) {
+
+ register volatile CARD32 *shMemC = shMem;
+ register int i;
+
+ gettimeofday( &now, &here);
+ magic = now.tv_usec & 0x000FFFFF;
+ req->magic = magic;
+ i = getpagesize() / sizeof(CARD32);
+ while(i--) {
+ *shMemC++ = magic;
+ magic = ~magic;
+ }
+ } else {
+ req->shmKey = -1;
+ }
+ }
+#else
+ req->shmKey = 0;
+#endif
+ if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+#ifdef HAS_SHM
+ if ( req->shmKey >= 0) {
+ shmdt( (const void *) shMem );
+ }
+#endif
+ return -1;
+ }
+#ifdef HAS_SHM
+ shmdt( (const void *) shMem );
+#endif
+
+ if (rep.length > 0) {
+
+ int realSize = rep.length << 2;
+
+ tmpBuf = (char *) Xmalloc(realSize);
+ if (tmpBuf) {
+ *name = (char *) Xmalloc(rep.nameLen);
+ if (*name) {
+ *busID = (char *) Xmalloc(rep.busIDLen);
+ if (! *busID) {
+ XFree(*name);
+ XFree(tmpBuf);
+ }
+ } else {
+ XFree(tmpBuf);
+ }
+ }
+
+ if (*name && *busID && tmpBuf) {
+
+ _XRead(dpy, tmpBuf, realSize);
+ strncpy(*name,tmpBuf,rep.nameLen);
+ strncpy(*busID,tmpBuf+rep.nameLen,rep.busIDLen);
+ XFree(tmpBuf);
+
+ } else {
+
+ _XEatData(dpy, realSize);
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return -1;
+
+ }
+ }
+
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ *major = rep.major;
+ *minor = rep.minor;
+ *patchLevel = rep.patchLevel;
+ *isLocal = (req->shmKey > 0) ? rep.isLocal : 1;
+ return (rep.length > 0) ? Success : BadImplementation;
+}
+