/*---------------------------------------------------------------------*\ * * WOW v1.0 * * Copyright (c) 1991, Microsoft Corporation * * WMMEDIA.C * WOW32 16-bit MultiMedia API support * * Contains: * General support apis * Timer support apis * MCI apis * * History: * Created 21-Jan-1992 by Mike Tricker (MikeTri), after jeffpar * Changed 15-Jul-1992 by Mike Tricker (MikeTri), fixing GetDevCaps calls * 26-Jul-1992 by Stephen Estrop (StephenE) thunks for mciSendCommand * 30-Jul-1992 by Mike Tricker (MikeTri), fixing Wave/Midi/MMIO * 03-Aug-1992 by Mike Tricker (MikeTri), added proper error handling * 08-Oct-1992 by StephenE used correct thunk macro for UINT's * also split file into 3 because it was getting to big. * \*---------------------------------------------------------------------*/ // // We define NO_STRICT so that the compiler doesn't moan and groan when // I use the FARPROC type for the Multi-Media api loading. // #define NO_STRICT #define OEMRESOURCE #include "precomp.h" #pragma hdrstop #include MODNAME(wmmedia.c); PCALLBACK_DATA pCallBackData; // A 32 bit ptr to the 16 bit callback data CRITICAL_SECTION mmCriticalSection; CRITICAL_SECTION mmHandleCriticalSection; // // All this stuff is required for the dynamic linking of Multi-Media to WOW32 // HANDLE hWinmm = NULL; FARPROC mmAPIEatCmdEntry = NULL; FARPROC mmAPIGetParamSize = NULL; FARPROC mmAPIUnlockCmdTable = NULL; FARPROC mmAPISendCmdW = NULL; FARPROC mmAPIFindCmdItem = NULL; FARPROC mmAPIGetYieldProc = NULL; VOID FASTCALL Set_MultiMedia_16bit_Directory( PVDMFRAME pFrame ); /*++ GENERIC FUNCTION PROTOTYPE: ========================== ULONG FASTCALL WMM32(PVDMFRAME pFrame) { ULONG ul; register P16 parg16; GETARGPTR(pFrame, sizeof(16), parg16); ALLOCVDMPTR GETVDMPTR GETMISCPTR et cetera 32 bit space> ul = GET16((parg16->f1, : : parg16->f); 16 bit space> FLUSHVDMPTR FREEARGPTR(parg16); RETURN(ul); } NOTE: The VDM frame is automatically set up, with all the function parameters available via parg16->f. Handles must ALWAYS be mapped for 16 -> 32 -> 16 space via the mapping tables laid out in WALIAS.C. Any storage you allocate must be freed (eventually...). Further to that - if a thunk which allocates memory fails in the 32 bit call then it must free that memory. Also, never update structures in 16 bit land if the 32 bit call fails. --*/ /* --------------------------------------------------------------------- ** General Support API's ** --------------------------------------------------------------------- */ /*****************************Private*Routine******************************\ * WMM32CallProc32 * * * * History: * dd-mm-94 - StephenE - Created * \**************************************************************************/ ULONG FASTCALL WMM32CallProc32( PVDMFRAME pFrame ) { register DWORD dwReturn; PMMCALLPROC3216 parg16; GETARGPTR(pFrame, sizeof(PMMCALLPROC32), parg16); // Don't call to Zero if (parg16->lpProcAddress == 0) { LOGDEBUG(LOG_ALWAYS,("MMCallProc32 - Error calling to 0 not allowed")); return(0); } // // Make sure we have the correct 16 bit directory set. // if (parg16->fSetCurrentDirectory != 0) { UpdateDosCurrentDirectory(DIR_DOS_TO_NT); } dwReturn = ((FARPROC)parg16->lpProcAddress)( parg16->p5, parg16->p4, parg16->p3, parg16->p2, parg16->p1); FREEARGPTR(parg16); return dwReturn; } /******************************Public*Routine******************************\ * WOW32ResolveMemory * * Enable multi-media (and others) to reliably map memory from 16 bit land * to 32 bit land. * * History: * dd-mm-93 - StephenE - Created * \**************************************************************************/ LPVOID APIENTRY WOW32ResolveMemory( VPVOID vp ) { LPVOID lpReturn; GETMISCPTR( vp, lpReturn ); return lpReturn; } /**********************************************************************\ * WOW32ResolveHandle * * This is a general purpose handle mapping function. It allows WOW thunk * extensions to get access to 32 bit handles given a 16 bit handle. * \**********************************************************************/ BOOL APIENTRY WOW32ResolveHandle( UINT uHandleType, UINT uMappingDirection, WORD wHandle16_In, LPWORD lpwHandle16_Out, DWORD dwHandle32_In, LPDWORD lpdwHandle32_Out ) { BOOL fReturn = FALSE; DWORD dwHandle32; WORD wHandle16; static FARPROC mmAPI = NULL; GET_MULTIMEDIA_API( "WOW32ResolveMultiMediaHandle", mmAPI, MMSYSERR_NODRIVER ); if ( uMappingDirection == WOW32_DIR_16IN_32OUT ) { switch ( uHandleType ) { case WOW32_USER_HANDLE: dwHandle32 = (DWORD)USER32( wHandle16_In ); break; case WOW32_GDI_HANDLE: dwHandle32 = (DWORD)GDI32( wHandle16_In ); break; case WOW32_WAVEIN_HANDLE: case WOW32_WAVEOUT_HANDLE: case WOW32_MIDIOUT_HANDLE: case WOW32_MIDIIN_HANDLE: (*mmAPI)( uHandleType, uMappingDirection, wHandle16_In, lpwHandle16_Out, dwHandle32_In, lpdwHandle32_Out ); break; } /* ** Protect ourself from being given a duff pointer. */ try { if ( *lpdwHandle32_Out = dwHandle32 ) { fReturn = TRUE; } else { fReturn = FALSE; } } except( EXCEPTION_EXECUTE_HANDLER ) { fReturn = FALSE; } } else if ( uMappingDirection == WOW32_DIR_32IN_16OUT ) { switch ( uHandleType ) { case WOW32_USER_HANDLE: wHandle16 = (WORD)USER16( dwHandle32_In ); break; case WOW32_GDI_HANDLE: wHandle16 = (WORD)GDI16( dwHandle32_In ); break; case WOW32_WAVEIN_HANDLE: case WOW32_WAVEOUT_HANDLE: case WOW32_MIDIOUT_HANDLE: case WOW32_MIDIIN_HANDLE: (*mmAPI)( uHandleType, uMappingDirection, wHandle16_In, lpwHandle16_Out, dwHandle32_In, lpdwHandle32_Out ); break; } /* ** Protect ourself from being given a duff pointer. */ try { if ( *lpwHandle16_Out = wHandle16 ) { fReturn = TRUE; } else { fReturn = FALSE; } } except( EXCEPTION_EXECUTE_HANDLER ) { fReturn = FALSE; } } return fReturn; } /**********************************************************************\ * * WOW32DriverCallback * * Callback stub, which invokes the "real" 16 bit callback. * The parameters to this function must be in the format that the 16 bit * code expects, i.e. all handles must be 16 bit handles, all addresses must * be 16:16 ones. * * * It is possible that this function will have been called with the * DCB_WINDOW set in which case the 16 bit interrupt handler will call * PostMessage. Howver, it is much more efficient if PostMessage is called * from the 32 bit side. * \**********************************************************************/ BOOL APIENTRY WOW32DriverCallback( DWORD dwCallback, DWORD dwFlags, WORD wID, WORD wMsg, DWORD dwUser, DWORD dw1, DWORD dw2 ) { static FARPROC mmAPI = NULL; GET_MULTIMEDIA_API( "WOW32DriverCallback", mmAPI, MMSYSERR_NODRIVER ); /* ** Just pass the call onto winmm */ return (*mmAPI)( dwCallback, dwFlags, wID, wMsg, dwUser, dw1, dw2 ); } /**********************************************************************\ * * Get_MultiMedia_ProcAddress * * This function gets the address of the given Multi-Media api. It loads * Winmm.dll if this it has not already been loaded. * \**********************************************************************/ FARPROC Get_MultiMedia_ProcAddress( LPSTR lpstrProcName ) { /* ** Either this is the first time this function has been called ** or the Multi-Media sub-system is in a bad way. */ if ( hWinmm == NULL ) { // dprintf2(( "Attempting to load WINMM.DLL" )); hWinmm = SafeLoadLibrary( "WINMM.DLL" ); if ( hWinmm == NULL ) { /* Looks like the Multi-Media sub-system is in a bad way */ // dprintf2(( "FAILED TO LOAD WINMM.DLL!!" )); return NULL; } } return GetProcAddress( hWinmm, lpstrProcName ); }