563 lines
15 KiB
C
563 lines
15 KiB
C
/******************************************************************************
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Copyright (c) 1985-1998 Microsoft Corporation
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Title: mmwnd.c - contains the window procedure for the WINMM 'global'
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window
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the global window is used by sndPlaySound and MCI for
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reciving notification messages.
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Version: 1.00
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Date: 04-Sep-1990
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Author: ToddLa
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Changes: SteveDav Jan 92 Ported to NT
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*****************************************************************************/
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#include "winmmi.h"
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#include "mci.h"
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// WINMMI.H includes WINDOWS.H which will eventually include WINMM.H
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//#ifdef DBG
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// #include "netname.h"
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//#endif // DBG
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#define CLASS_NAME MAKEINTATOM(43) // 42 clashes with 16-bit mmsystem
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DWORD mciWindowThreadId;
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STATICFN LRESULT mmWndProc(HWND hwnd, MMMESSAGE msg, WPARAM wParam, LPARAM lParam);
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STATICFN BOOL WaitForWaitMsg(void);
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typedef struct SentMsg {
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LRESULT Result;
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MMMESSAGE msg;
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WPARAM wParam;
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LPARAM lParam;
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UINT SendingThread;
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} SENTMSG, * PSENTMSG;
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/*
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** Client notification stuff
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*/
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HWND hwndNotify = NULL;
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/*
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** Server notification stuff
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*/
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PGLOBALMCI base;
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CRITICAL_SECTION mciGlobalCritSec;
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HANDLE hEvent;
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/***************************************************************************/
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STATICDT BOOL classcreated = FALSE;
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STATICFN BOOL PASCAL FAR CreateMMClass(
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void)
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{
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WNDCLASS cls;
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if (classcreated) {
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return(TRUE);
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}
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ZeroMemory(&cls, sizeof(WNDCLASS));
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cls.hCursor = NULL;
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cls.hIcon = LoadIcon(ghInst, MAKEINTRESOURCE(IDI_MCIHWND));
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cls.lpszMenuName = NULL;
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cls.lpszClassName = CLASS_NAME;
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cls.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
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cls.hInstance = ghInst;
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cls.style = CS_GLOBALCLASS;
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cls.lpfnWndProc = mmWndProc;
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cls.cbWndExtra = 0;
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cls.cbClsExtra = 0;
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classcreated = RegisterClass(&cls);
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return classcreated;
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}
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STATICDT CHAR mciWndName[] = "MCI command handling window";
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//
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//
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//
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BOOL mciGlobalInit(
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void)
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{
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return TRUE;
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}
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#if _MSC_FULL_VER >= 13008827
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#pragma warning(push)
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#pragma warning(disable:4715) // Not all control paths return (due to infinite loop)
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#endif
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//
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//
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//
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STATICFN DWORD mciwnd2(LPVOID lpParams)
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{
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UINT msg;
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LPCWSTR lszSound;
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DWORD wFlags;
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DWORD n;
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WCHAR soundname[MAX_PATH];
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while (TRUE) {
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LockMCIGlobal;
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if (!base->msg) {
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#ifdef LATER
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This still needs to be tidied up. The intention is to have a
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list of sounds that should be played. This will also make it
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easier to STOP all sound playing by clearing out the list.
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#endif
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// We have no work to do; reset the event and wait for
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// more work to be posted. By setting the event within
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// the lock we are safe from timing windows.
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ResetMCIEvent(hEvent);
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UnlockMCIGlobal;
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dprintf2(("MCIWND2 thread waiting for next event..."));
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n = WaitForSingleObject(hEvent, WAIT_FOREVER);
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#if DBG
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if ((DWORD)-1 == n) {
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n = GetLastError();
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dprintf2(("Error %d waiting on event in worker thread", n));
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}
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#endif
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LockMCIGlobal;
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}
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msg = base->msg;
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wFlags = base->dwFlags;
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lszSound = base->lszSound;
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base->msg=0;
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if (wFlags & SND_FILENAME) {
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// Have to copy the file name
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wcscpy(soundname, base->szSound);
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lszSound = soundname;
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dprintf3(("Copying the soundfile name to a local variable: %ls", lszSound));
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} else {
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dprintf3(("Playing a system sound"));
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}
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UnlockMCIGlobal;
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PlaySoundW(lszSound, NULL, (wFlags & ~SND_ASYNC)); // Play sync
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}
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#if DBG
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dprintf(("MCIWND2 thread ending...!!"));
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#endif
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return(0);
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}
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#if _MSC_FULL_VER >= 13008827
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#pragma warning(pop)
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#endif
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/***************************************************************************
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*
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* @doc INTERNAL WINMM
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*
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* @api void | WndTerminate | called when WINMM is terminating
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*
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***************************************************************************/
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STATICFN void NEAR PASCAL WndTerminate(
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void)
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{
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dprintf1(("hwndNotify terminating"));
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if (hwndNotify)
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{
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dprintf1(("sending Close\n"));
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SendMessage(hwndNotify, WM_CLOSE, 0, 0L);
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UnregisterClass(CLASS_NAME, ghInst);
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}
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}
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/***************************************************************************
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*
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* @doc INTERNAL WINMM
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*
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* @api LRESULT | mmWndProc | The Window procedure for the WINMM window
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*
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* @comm mmWndProc calls DefWindowProc for all messages except:
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*
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* MM_MCINOTIFY: calls MciNotify() in MCI.C
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* MM_WOM_DONE: calls WaveOutNotify() in PLAYWAV.C
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*
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* @xref sndPlaySound
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*
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***************************************************************************/
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STATICFN LRESULT mmWndProc(
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HWND hwnd,
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MMMESSAGE msg,
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WPARAM wParam,
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LPARAM lParam)
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{
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#if DBG
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dprintf4(("MMWNDPROC: Msg %5x Hwnd=%8x\r\n wParam=%8x lParam=%8x", msg, hwnd, wParam, lParam));
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#endif
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switch (msg)
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{
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case WM_CREATE:
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hwndNotify = hwnd;
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break;
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case MM_MCINOTIFY:
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MciNotify((DWORD)wParam, (LONG)lParam);
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break;
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#define NODELAY
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#ifdef NODELAY
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case MM_WOM_DONE:
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/*
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The sound started with sndPlaySound has completed
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so we should call the cleanup routine. On NT we do NOT
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delay as the wave really has finished playing.
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*/
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dprintf2(("Received MM_WOM_DONE, calling WaveOutNotify"));
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WaveOutNotify(0,0);
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break;
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#else
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/*
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SOUND_DELAY is the number of ms to delay before closing the wave device
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after the buffer is done.
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*/
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#define SOUND_DELAY 300
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case WM_TIMER:
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KillTimer(hwnd, (UINT)wParam);
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WaveOutNotify(0,0);
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break;
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case MM_WOM_DONE:
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/*
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The sound started with sndPlaySound has completed
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so we should call the cleanup routine. We delay
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this call for several hundred milliseconds because
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some sound drivers have a nasty characteristic - they
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will notify before the final DMA transfer is complete
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because the app. supplied buffer is no longer required.
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This means that they may have to spin inside a close
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request until the dma transfer completes. This hangs
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the system for hundreds of milliseconds.
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*/
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dprintf2(("Received MM_WOM_DONE, setting timer delay"));
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SetTimer(hwndNotify, 1, SOUND_DELAY, NULL);
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break;
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#endif
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case MM_SND_ABORT: /* Do not need to do anything */
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break;
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case MM_SND_PLAY:
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{
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// There is a critical section problem as we have one global, and
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// sounds being played on separate threads.
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MSG abortmsg;
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if (SND_ALIAS_ID == (wParam & SND_ALIAS_ID)) {
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return((LRESULT)PlaySound((LPCSTR)lParam, NULL, (DWORD)wParam & ~SND_ASYNC));
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}
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if (!PeekMessage(&abortmsg, hwnd, MM_SND_ABORT, MM_SND_ABORT, PM_NOREMOVE)) {
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// There is no pending synchronous sound
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return (LRESULT)(LONG)sndMessage((LPWSTR)lParam, (UINT)wParam);
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}
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// We must free the sound definition. Note that this does not close
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// the critical section as we may be past this check point when the
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// synchronous sound causes the abort message to be posted. But it
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// will prevent spurious code being run. It is perfectly valid for
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// an asynchronous sound to be after the abort message, which is
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// why the message is not removed at this point.
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dprintf3(("Aborting sound..."));
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if (!(wParam & SND_MEMORY)) {
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LocalFree((HANDLE)lParam);
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}
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break;
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}
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case MM_SND_SEND:
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((PSENTMSG)wParam)->Result =
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mmWndProc(NULL, ((PSENTMSG)wParam)->msg,
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((PSENTMSG)wParam)->wParam,
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((PSENTMSG)wParam)->lParam);
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PostThreadMessage(((PSENTMSG)wParam)->SendingThread, MCIWAITMSG, 0, 0);
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break;
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case MM_POLYMSGBUFRDONE:
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--(((PMIDIEMU)wParam)->cPostedBuffers);
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midiOutNukePMBuffer((PMIDIEMU)wParam, (LPMIDIHDR)lParam);
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return (0L);
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case MM_MCISYSTEM_STRING:
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// In MCI.C
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return (LRESULT)mciRelaySystemString ((LPMCI_SYSTEM_MESSAGE)lParam);
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default:
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return DefWindowProc(hwnd, msg, wParam,lParam);
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}
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return (LRESULT)0L;
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}
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void mciwindow(HANDLE hEvent);
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/*
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** Initialize all the bits for creating sound. For non-server apps this
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** means initializing our hwnd. For the server we set up a thread et
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*/
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BOOL InitAsyncSound(VOID)
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{
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if (!WinmmRunningInServer) {
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return CreatehwndNotify();
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} else {
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LockMCIGlobal;
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if (base == NULL) {
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HANDLE hThread;
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PGLOBALMCI pBase;
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/*
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** We need a thread, an event (we already have the crit sec) and
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** some memory
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*/
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pBase = mciAlloc(sizeof(GLOBALMCI));
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if (pBase == NULL) {
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UnlockMCIGlobal;
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return FALSE;
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}
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hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (hEvent == NULL) {
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mciFree((PVOID)pBase);
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UnlockMCIGlobal;
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return FALSE;
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}
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/*
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** We have to create a thread by a special method inside the
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** server and register it with CSR
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*/
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if (!CreateServerPlayingThread((PVOID)mciwnd2)) {
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mciFree((PVOID)pBase);
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CloseHandle(hEvent);
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hEvent = NULL;
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UnlockMCIGlobal;
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return FALSE;
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}
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base = pBase;
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}
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UnlockMCIGlobal;
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return base != NULL;
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}
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}
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BOOL CreatehwndNotify(VOID)
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{
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HANDLE hWindowThread;
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BOOL ReturnCode;
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HANDLE hEventForCreate;
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mciEnter("CreatehwndNotify");
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if (hwndNotify != NULL) {
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mciLeave("CreatehwndNotify");
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return TRUE;
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}
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if (!CreateMMClass()) {
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dprintf1(("Failed to create the MCI global window class, rc=%d", GetLastError()));
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mciLeave("CreatehwndNotify");
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return FALSE;
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} else {
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dprintf4(("Created global window class"));
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}
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// We create our new thread then suspend ourselves until the new
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// thread has called CreateWindow. We are then triggered to run
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// and passed the results of the CreateWindow call. NOTE: Any
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// messages that arrive for this thread that are not destined for
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// a specific window will be DISCARDED until the one message we
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// are waiting for arrives. We could create an event and wait
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// for that event to be triggered. This was slightly quicker to
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// code and involves less creation/destruction of resources.
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hEventForCreate = CreateEvent(NULL, FALSE, FALSE, NULL);
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if (hEventForCreate != NULL) {
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hWindowThread = CreateThread(NULL, // attributes
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0, // same stack size as thread 1
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(LPTHREAD_START_ROUTINE)mciwindow,
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(LPVOID) hEventForCreate,
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0, // Thread runs immediately
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&mciWindowThreadId
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);
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CloseHandle(hWindowThread);
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if (!hWindowThread) {
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dprintf1(("Failed to create window thread. Error: %XH", GetLastError()));
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} else {
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dprintf3(("Window thread is %x", mciWindowThreadId));
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WaitForSingleObject(hEventForCreate, INFINITE);
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dprintf3(("hwndNotify now %x", hwndNotify));
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}
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CloseHandle(hEventForCreate);
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}
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ReturnCode = hwndNotify != NULL;
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mciLeave("CreatehwndNotify");
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return ReturnCode;
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}
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void mciwindow(
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HANDLE hEvent)
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{
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BOOL fResult = TRUE;
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//
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// Higher priority so we hear the sound at once!
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// This seems to work better than calling SetThreadPriority
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// on the handle just after creation (?).
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SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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if (!(hwndNotify = CreateWindowEx(0, CLASS_NAME, mciWndName, WS_OVERLAPPED,
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0, 0, 0, 0, NULL, NULL, ghInst, NULL))) {
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dprintf1(("Failed to create the MCI global window, rc=%d", GetLastError()));
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UnregisterClass(CLASS_NAME, ghInst);
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fResult = FALSE;
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}
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//
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// Let our creator thread know we are up and running
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//
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SetEvent(hEvent);
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if (fResult) {
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MSG msg;
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HWND hwndTemp;
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while (GetMessage(&msg, NULL, 0, 0)) {
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/*
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* If the message is for a window dispatch it
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*/
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dprintf3(("mciwindow - Msg %5x hwnd %8x (%8x %8x)", msg.message, msg.hwnd, msg.wParam, msg.lParam));
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if (msg.hwnd != NULL) {
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DispatchMessage(&msg);
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}
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}
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hwndTemp = hwndNotify;
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hwndNotify = NULL; // Clear the global before destroying the window
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DestroyWindow(hwndTemp);
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}
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ExitThread(0);
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}
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#if 0 //LATER - not currently used
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//
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// Routine to SEND (synchronous) a message to another thread. Currently
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// the standard API allows you to send a message to a window, or post to
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// a thread. There are circumstances when it would be helpful to send
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// to a thread.
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//
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STATICFN LRESULT SendThreadMessage(
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UINT tid,
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MMMESSAGE msg,
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WPARAM wParam,
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LPARAM lParam)
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{
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SENTMSG smsg;
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smsg.msg = msg;
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smsg.wParam = wParam;
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smsg.lParam = lParam;
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smsg.SendingThread = GetCurrentThreadId();
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PostThreadMessage(tid, MM_SND_SEND, (WPARAM)&smsg, 0);
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WaitForWaitMsg();
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return(smsg.Result);
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}
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#endif
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/*********************************************************************\
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* WaitForWaitMsg: *
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* *
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* This routine waits until a specific message is returned to this *
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* thread. While waiting NO posted messages are processed, but sent *
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* messages will be handled within GetMessage. The routine is used *
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* to synchronise two threads of execution, and to implement a *
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* synchronous PostMessage operation between threads. *
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* *
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\*********************************************************************/
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STATICFN BOOL WaitForWaitMsg() {
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for (;;) {
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MSG msg;
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/*
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* Retrieve our particular message
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*/
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GetMessage(&msg, NULL, MCIWAITMSG, MCIWAITMSG);
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/*
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* If the message is for a window dispatch it
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*/
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WinAssert(msg.hwnd == NULL);
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#if 0
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if (msg.hwnd != NULL) { // This should not be executed.
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DispatchMessage(&msg); // MCIWAITMSG is not sent to a window
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} else
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#endif
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/*
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* MCIWAITMSG is the signal message
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*/
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if (msg.message == MCIWAITMSG) {
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break;
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}
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}
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return(TRUE);
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}
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