diff options
author | Thomas Hellstrom <unichrome@shipmail.org> | 2004-11-13 11:09:23 +0000 |
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committer | Thomas Hellstrom <unichrome@shipmail.org> | 2004-11-13 11:09:23 +0000 |
commit | 120c3035f60138ad15599b0b0c4468400e966423 (patch) | |
tree | 3c7629856e70c877689e7cb158bfcc9eb8c7bcd5 /src/XvMC.c | |
parent | 0077c785f91a80d48216a969757bc3f3b607e7e2 (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.c | 127 |
1 files changed, 127 insertions, 0 deletions
@@ -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; +} + |