dwRet = g_pHWContext->GetNumOutputDevices();
            break;
        }

    case WIDM_GETNUMDEVS:
        {
            dwRet = g_pHWContext->GetNumInputDevices();
            break;
        }

    case WODM_GETDEVCAPS:
        {
            DeviceContext *pDeviceContext;

            if (pStreamContext)
            {
                pDeviceContext=pStreamContext->GetDeviceContext();
            }
            else
            {
                pDeviceContext = g_pHWContext->GetOutputDeviceContext(uDeviceId);
            }

            dwRet = pDeviceContext->GetDevCaps((PVOID)dwParam1,dwParam2);
            break;
        }


    case WIDM_GETDEVCAPS:
        {
            DeviceContext *pDeviceContext;

            if (pStreamContext)
            {
                pDeviceContext=pStreamContext->GetDeviceContext();
            }
            else
            {
                pDeviceContext = g_pHWContext->GetInputDeviceContext(uDeviceId);
            }

            dwRet = pDeviceContext->GetDevCaps((PVOID)dwParam1,dwParam2);
            break;
        }

    case WODM_GETEXTDEVCAPS:
        {
            DeviceContext *pDeviceContext;
            UINT NumDevs = g_pHWContext->GetNumOutputDevices();

            if (pStreamContext)
            {
                pDeviceContext=pStreamContext->GetDeviceContext();
            }
            else
            {
                pDeviceContext = g_pHWContext->GetOutputDeviceContext(uDeviceId);
            }

            dwRet = pDeviceContext->GetExtDevCaps((PVOID)dwParam1,dwParam2);
            break;
        }

    case WODM_OPEN:
        {
            // DEBUGMSG(1, (TEXT("WODM_OPEN\r\n"));
            DeviceContext *pDeviceContext = g_pHWContext->GetOutputDeviceContext(uDeviceId);
            dwRet = pDeviceContext->OpenStream((LPWAVEOPENDESC)dwParam1, dwParam2, (StreamContext **)dwUser);
            break;
        }

    case WIDM_OPEN:
        {
            // DEBUGMSG(1, (TEXT("WIDM_OPEN\r\n"));
            DeviceContext *pDeviceContext = g_pHWContext->GetInputDeviceContext(uDeviceId);
            dwRet = pDeviceContext->OpenStream((LPWAVEOPENDESC)dwParam1, dwParam2, (StreamContext **)dwUser);
            break;
        }

    case WODM_CLOSE:
    case WIDM_CLOSE:
        {
            // DEBUGMSG(1, (TEXT("WIDM_CLOSE/WODM_CLOSE\r\n"));
            dwRet = pStreamContext->Close();

            // Release stream context here, rather than inside StreamContext::Close, so that if someone
            // (like CMidiStream) has subclassed Close there's no chance that the object will get released
            // out from under them.
            if (dwRet==MMSYSERR_NOERROR)
            {
                pStreamContext->Release();
            }
            break;
        }

    case WODM_RESTART:
    case WIDM_START:
        {
            dwRet = pStreamContext->Run();
            break;
        }

    case WODM_PAUSE:
    case WIDM_STOP:
        {
            dwRet = pStreamContext->Stop();
            break;
        }

    case WODM_GETPOS:
    case WIDM_GETPOS:
        {
            dwRet = pStreamContext->GetPos((PMMTIME)dwParam1);
            break;
        }

    case WODM_RESET:
    case WIDM_RESET:
        {
            dwRet = pStreamContext->Reset();
            break;
        }

    case WODM_WRITE:
    case WIDM_ADDBUFFER:
        {
            // DEBUGMSG(1, (TEXT("WODM_WRITE/WIDM_ADDBUFFER, Buffer=0x%x\r\n"),dwParam1);
            dwRet = pStreamContext->QueueBuffer((LPWAVEHDR)dwParam1);
            break;
        }

    case WODM_GETVOLUME:
        {
            PULONG pdwGain = (PULONG)dwParam1;

            if (pStreamContext)
            {
                *pdwGain = pStreamContext->GetGain();
            }
            else
            {
                // Handle device gain in hardware
                *pdwGain = g_pHWContext->GetOutputGain();
                // Handle device gain in software
                //DeviceContext *pDeviceContext = g_pHWContext->GetOutputDeviceContext(uDeviceId);
                //*pdwGain = pDeviceContext->GetGain();
            }
            dwRet = MMSYSERR_NOERROR;
            break;
        }

    case WODM_SETVOLUME:
        {
            LONG dwGain = dwParam1;
            if (pStreamContext)
            {
                dwRet = pStreamContext->SetGain(dwGain);
            }
            else
            {
                // Handle device gain in hardware
                dwRet = g_pHWContext->SetOutputGain(dwGain);
                // Handle device gain in software
                //DeviceContext *pDeviceContext = g_pHWContext->GetOutputDeviceContext(uDeviceId);
                //dwRet = pDeviceContext->SetGain(dwGain);
            }
            break;
        }

    case WODM_BREAKLOOP:
        {
            dwRet = pStreamContext->BreakLoop();
            break;
        }

    case WODM_SETPLAYBACKRATE:
        {
            WaveStreamContext *pWaveStream = (WaveStreamContext *)dwUser;
            dwRet = pWaveStream->SetRate(dwParam1);
            break;
        }

    case WODM_GETPLAYBACKRATE:
        {
            WaveStreamContext *pWaveStream = (WaveStreamContext *)dwUser;
            dwRet = pWaveStream->GetRate((DWORD *)dwParam1);
            break;
        }

    case MM_WOM_SETSECONDARYGAINCLASS:
        {
            dwRet = pStreamContext->SetSecondaryGainClass(dwParam1);
            break;
        }

    case MM_WOM_SETSECONDARYGAINLIMIT:
        {
            DeviceContext *pDeviceContext;
            if (pStreamContext)
            {
                pDeviceContext = pStreamContext->GetDeviceContext();
            }
            else
            {
                pDeviceContext = g_pHWContext->GetOutputDeviceContext(uDeviceId);
            }
            dwRet = pDeviceContext->SetSecondaryGainLimit(dwParam1,dwParam2);
            break;
        }

    case MM_MOM_MIDIMESSAGE:
        {
            CMidiStream *pMidiStream = (CMidiStream *)dwUser;
            dwRet = pMidiStream->MidiMessage(dwParam1);
            break;
        }
// unsupported messages
    case WODM_GETPITCH:
    case WODM_SETPITCH:
    case WODM_PREPARE:
    case WODM_UNPREPARE:
    case WIDM_PREPARE:
    case WIDM_UNPREPARE:
        default:
        dwRet  = MMSYSERR_NOTSUPPORTED;
    }
    g_pHWContext->Unlock();

    // Pass the return code back via pBufOut
    if (pdwResult)
    {
        *pdwResult = dwRet;
    }

    return(TRUE);
}

// -----------------------------------------------------------------------------
//
//  @doc    WDEV_EXT
//
//  @func   BOOL | WAV_IOControl | Device IO control routine
//
//  @parm   DWORD | dwOpenData | Value returned from WAV_Open call
//
//  @parm   DWORD | dwCode |
//          IO control code for the function to be performed. WAV_IOControl only
//          supports one IOCTL value (IOCTL_WAV_MESSAGE)
//
//  @parm   PBYTE | pBufIn |
//          Pointer to the input parameter structure (<t MMDRV_MESSAGE_PARAMS>).
//
//  @parm   DWORD | dwLenIn |
//          Size in bytes of input parameter structure (sizeof(<t MMDRV_MESSAGE_PARAMS>)).
//
//  @parm   PBYTE | pBufOut | Pointer to the return value (DWORD).
//
//  @parm   DWORD | dwLenOut | Size of the return value variable (sizeof(DWORD)).
//
//  @parm   PDWORD | pdwActualOut | Unused
//
//  @rdesc  Returns TRUE for success, FALSE for failure
//
//  @xref   <t Wave Input Driver Messages> (WIDM_XXX) <nl>
//          <t Wave Output Driver Messages> (WODM_XXX)
//
// -----------------------------------------------------------------------------
extern "C" BOOL WAV_IOControl(PDWORD  pdwOpenData,
                   DWORD  dwCode,
                   PBYTE  pBufIn,
                   DWORD  dwLenIn,
                   PBYTE  pBufOut,
                   DWORD  dwLenOut,
                   PDWORD pdwActualOut)
{

    // check caller trust. if context hasn't been initialized, load from CeGetCallerTrust.
    if (*pdwOpenData != OEM_CERTIFY_TRUST) {
        if (OEM_CERTIFY_TRUST != (*pdwOpenData = CeGetCallerTrust())) {
            PRINTMSG(ZONE_WARN, (TEXT("WAV_IoControl: untrusted process\r\n")));
            SetLastError(ERROR_ACCESS_DENIED);
            return FALSE;
        }
    }

    _try
    {
        switch (dwCode)
        {
        case IOCTL_MIX_MESSAGE:
                        return HandleMixerMessage((PMMDRV_MESSAGE_PARAMS)pBufIn, (DWORD *)pBufOut);

        case IOCTL_WAV_MESSAGE:
            return HandleWaveMessage((PMMDRV_MESSAGE_PARAMS)pBufIn, (DWORD *)pBufOut);
        }

    }
    _except (GetExceptionCode() == STATUS_ACCESS_VIOLATION ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
    {
        RETAILMSG(1, (TEXT("EXCEPTION IN WAV_IOControl!!!!\r\n")));
        SetLastError(E_FAIL);
    }

    return(FALSE);
}