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Runtime-patching for windows to fix crash with drv43260.dll 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24107 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2007-08-20 16:17:13 +00:00
parent 78dbd8ba26
commit b284631167
1 changed files with 44 additions and 0 deletions
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44
libmpcodecs/vd_realvid.c
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@ -152,6 +152,30 @@ void* WINAPI LoadLibraryA(char* name);
void* WINAPI GetProcAddress(void* handle,char* func);
int WINAPI FreeLibrary(void *handle);
#ifndef WIN32_LOADER
void * WINAPI GetModuleHandleA(char *);
static int patch_dll(uint8_t *patchpos, const uint8_t *oldcode,
const uint8_t *newcode, int codesize) {
void *handle = GetModuleHandleA("kernel32");
int WINAPI (*VirtProt)(void *, unsigned, int, int *);
int res = 0;
int prot, tmp;
VirtProt = GetProcAddress(handle, "VirtualProtect");
// change permissions to PAGE_WRITECOPY
if (!VirtProt ||
!VirtProt(patchpos, codesize, 0x08, &prot)) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "VirtualProtect failed at %p\n", patchpos);
return 0;
}
if (memcmp(patchpos, oldcode, codesize) == 0) {
memcpy(patchpos, newcode, codesize);
res = 1;
}
VirtProt(patchpos, codesize, prot, &tmp);
return res;
}
#endif
static int load_syms_windows(char *path) {
void *handle;
@ -178,6 +202,26 @@ static int load_syms_windows(char *path) {
{
dll_type = 1;
rv_handle = handle;
#ifndef WIN32_LOADER
{
int patched = 0;
// drv43260.dll
if (wrvyuv_transform == (void *)0x634114d0) {
// patch away multithreaded decoding, it causes crashes
static const uint8_t oldcode[13] = {
0x83, 0xbb, 0xf8, 0x05, 0x00, 0x00, 0x01,
0x0f, 0x86, 0xd0, 0x00, 0x00, 0x00 };
static const uint8_t newcode[13] = {
0x31, 0xc0,
0x89, 0x83, 0xf8, 0x05, 0x00, 0x00,
0xe9, 0xd0, 0x00, 0x00, 0x00 };
patched = patch_dll((void *)0x634132fa, oldcode, newcode,
sizeof(oldcode));
}
if (!patched)
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "Could not patch Real codec, this might crash on multi-CPU systems\n");
}
#endif
return 1;
}
mp_msg(MSGT_DECVIDEO,MSGL_WARN,"Error resolving symbols! (version incompatibility?)\n");