449 lines
12 KiB
C
449 lines
12 KiB
C
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/****************************************************************************
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*
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* drvutil.c
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*
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* Multimedia kernel driver support component (mmdrv)
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*
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* Copyright (c) 1992-1995 Microsoft Corporation
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*
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* Support functions common to multiple multi-media drivers :
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*
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* -- Open a device
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* -- Translate a kernel IO return code to a multi-media return code
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* -- Count the number of devices of a given type
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* -- Set and Get data synchronously to a kernel device
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*
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* History
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* 01-Feb-1992 - Robin Speed (RobinSp) wrote it
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* 04-Feb-1992 - Reviewed by SteveDav
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*
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***************************************************************************/
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#include "mmdrv.h"
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#include <ntddwave.h>
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#include <ntddmidi.h>
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#include <ntddaux.h>
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api MMRESULT | sndOpenDev | Open the kernel driver device corresponding
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* to a logical wave device id
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*
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* @parm UINT | DeviceType | The type of device
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*
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* @parm DWORD | dwId | The device id
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*
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* @parm PHANDLE | phDev | Where to return the kernel device handle
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*
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* @parm ACCESS_MASK | Access | The desired access
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*
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* @comm For our sound devices the only relevant access are read and
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* read/write. Device should ALWAYS allow opens for read unless some
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* resource or access-rights restriction occurs.
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***************************************************************************/
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MMRESULT sndOpenDev(UINT DeviceType, DWORD dwId,
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PHANDLE phDev, DWORD Access)
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{
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WCHAR cDev[SOUND_MAX_DEVICE_NAME];
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WinAssert(DeviceType == WaveOutDevice ||
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DeviceType == WaveInDevice ||
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DeviceType == MidiOutDevice ||
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DeviceType == MidiInDevice ||
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DeviceType == AuxDevice);
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*phDev = INVALID_HANDLE_VALUE; // Always initialise the return value
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//
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// Check it's not out of range
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//
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if (dwId > SOUND_MAX_DEVICES) {
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return MMSYSERR_BADDEVICEID;
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}
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//
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// Create the device name and open it - remove '\Device'
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//
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wsprintf(cDev, L"\\\\.%ls%d",
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(DeviceType == WaveOutDevice ? DD_WAVE_OUT_DEVICE_NAME_U :
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DeviceType == WaveInDevice ? DD_WAVE_IN_DEVICE_NAME_U :
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DeviceType == MidiOutDevice ? DD_MIDI_OUT_DEVICE_NAME_U :
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DeviceType == MidiInDevice ? DD_MIDI_IN_DEVICE_NAME_U :
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DD_AUX_DEVICE_NAME_U) +
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strlen("\\Device"),
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dwId);
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*phDev = CreateFile(cDev,
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Access,
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FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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Access != GENERIC_READ ? FILE_FLAG_OVERLAPPED : 0,
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NULL);
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//
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// Check up on the driver for refusing to open
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// multiply for read
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//
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WinAssert(!(GetLastError() == ERROR_ACCESS_DENIED &&
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Access == GENERIC_READ));
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//
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// Return status to caller
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//
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return *phDev != INVALID_HANDLE_VALUE ? MMSYSERR_NOERROR : sndTranslateStatus();
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api void | sndTranslateStatus | This function translates an NT status
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* code into a multi-media error code as far as possible.
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*
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* @parm NTSTATUS | Status | The NT base operating system return status.
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*
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*
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* @rdesc The multi-media error code.
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***************************************************************************/
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DWORD sndTranslateStatus(void)
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{
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#if DBG
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UINT n;
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switch (n=GetLastError()) {
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#else
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switch (GetLastError()) {
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#endif
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case NO_ERROR:
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case ERROR_IO_PENDING:
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return MMSYSERR_NOERROR;
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case ERROR_BUSY:
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return MMSYSERR_ALLOCATED;
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case ERROR_NOT_SUPPORTED:
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case ERROR_INVALID_FUNCTION:
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return MMSYSERR_NOTSUPPORTED;
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case ERROR_NOT_ENOUGH_MEMORY:
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return MMSYSERR_NOMEM;
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case ERROR_ACCESS_DENIED:
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return MMSYSERR_BADDEVICEID;
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case ERROR_INSUFFICIENT_BUFFER:
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return MMSYSERR_INVALPARAM;
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default:
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dprintf2(("sndTranslateStatus: LastError = %d", n));
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return MMSYSERR_ERROR;
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}
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api DWORD | sndGetNumDevs | This function returns the number of (kernel)
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*
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* @parm UINT | DeviceType | The Device type
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*
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* @rdesc The number of devices.
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***************************************************************************/
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DWORD sndGetNumDevs(UINT DeviceType)
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{
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//
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// Look for devices until we don't find one
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//
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int i;
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HANDLE h;
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for (i=0;
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sndOpenDev(DeviceType, i, &h, GENERIC_READ) == MMSYSERR_NOERROR;
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i++) {
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//
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// Possible future work - try calling an actual function to make sure
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// this worked.
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//
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CloseHandle(h);
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}
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//
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// We incremented i each time we found a good device
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//
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return i;
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api DWORD | sndSetData | This function sets the volume given a device id
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* and could be used for other soft value setting
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* when only read access is required to the device
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*
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* @parm UINT | DeviceType | The Device type
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*
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* @parm UINT | DeviceId | The device id
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*
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* @parm UINT | Length | Length of data to set
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*
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* @parm PBYTE | Data | Data to set
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*
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* @parm ULONG | Ioctl | The Ioctl to use
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*
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* @rdesc MM... return code.
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***************************************************************************/
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MMRESULT sndSetData(UINT DeviceType, UINT DeviceId, UINT Length, PBYTE Data,
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ULONG Ioctl)
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{
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HANDLE hDev;
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MMRESULT mRet;
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DWORD BytesReturned;
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//
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// Open the wave output device
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//
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mRet = sndOpenDev(DeviceType, DeviceId, &hDev, GENERIC_READ);
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if (mRet != MMSYSERR_NOERROR) {
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return mRet;
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}
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//
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// Set our data.
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//
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// Setting the overlapped parameter (last) to null means we
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// wait until the operation completes.
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//
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mRet = DeviceIoControl(hDev, Ioctl, Data, Length, NULL, 0,
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&BytesReturned, NULL) ?
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MMSYSERR_NOERROR : sndTranslateStatus();
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//
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// Close our file and return
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//
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CloseHandle(hDev);
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return mRet;
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api DWORD | sndGetData | This function gets data from a given device
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* specified by device id when read-only access is
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* sufficient
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*
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* @parm UINT | DeviceType | The Device type
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*
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* @parm UINT | DeviceId | The device id
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*
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* @parm UINT | Length | Length of data to set
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*
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* @parm PBYTE | Data | Data to set
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*
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* @parm ULONG | Ioctl | The Ioctl to use
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*
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* @rdesc MM... return code.
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***************************************************************************/
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MMRESULT sndGetData(UINT DeviceType, UINT DeviceId, UINT Length, PBYTE Data,
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ULONG Ioctl)
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{
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HANDLE hDev;
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MMRESULT mRet;
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DWORD BytesReturned;
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//
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// Open the wave output device
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//
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mRet = sndOpenDev(DeviceType, DeviceId, &hDev, GENERIC_READ);
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if (mRet != MMSYSERR_NOERROR) {
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return mRet;
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}
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//
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// Set our data.
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//
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// Setting the overlapped parameter (last) to null means we
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// wait until the operation completes.
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//
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mRet = DeviceIoControl(hDev, Ioctl, NULL, 0, (LPVOID)Data, Length,
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&BytesReturned, NULL) ?
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MMSYSERR_NOERROR : sndTranslateStatus();
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//
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// Close our file and return
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//
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CloseHandle(hDev);
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return mRet;
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api MMRESULT | sndGetHandleData | Get data from a device using its handle
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*
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* @parm PWAVEALLOC | pClient | Client handle.
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*
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* @parm DWORD | dwSize | Size of the data
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*
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* @parm PVOID | pData | Where to put the data.
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*
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* @parm ULONG | Function | The Ioctl to use
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*
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* @rdesc MMSYS... return value.
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***************************************************************************/
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MMRESULT sndGetHandleData(HANDLE hDev,
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DWORD dwSize,
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PVOID pData,
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ULONG Ioctl,
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HANDLE hEvent)
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{
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OVERLAPPED Overlap;
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DWORD BytesReturned;
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WinAssert(hDev != NULL);
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memset(&Overlap, 0, sizeof(Overlap));
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Overlap.hEvent = hEvent;
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//
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// Issue the IO control. We must wait with our own event because
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// setting the overlapped object to null will complete if other
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// IOs complete.
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//
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if (!DeviceIoControl(hDev,
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Ioctl,
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NULL,
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0,
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pData,
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dwSize,
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&BytesReturned,
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&Overlap)) {
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DWORD cbTransfer;
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//
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// Wait for completion if necessary
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//
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if (GetLastError() == ERROR_IO_PENDING) {
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if (!GetOverlappedResult(hDev, &Overlap, &cbTransfer,
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TRUE)) {
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return sndTranslateStatus();
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}
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} else {
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return sndTranslateStatus();
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}
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}
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//
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// We'd better peek aleratbly to flush out any IO
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// completions so that things like RESET only
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// return when all buffers have been completed
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//
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// This relies on the fact that SleepEx will return
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// WAIT_IO_COMPLETION in preference to OK
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//
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while (SetEvent(hEvent) &&
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WaitForSingleObjectEx(hEvent, 0, TRUE) == WAIT_IO_COMPLETION) {}
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return MMSYSERR_NOERROR;
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api MMRESULT | sndSetHandleData | Pass data to a device using its handle
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*
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* @parm PWAVEALLOC | pClient | Client handle.
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*
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* @parm DWORD | dwSize | Size of the data
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*
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* @parm PVOID | pData | Data to send.
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*
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* @parm ULONG | Function | The Ioctl to use
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*
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* @rdesc MMSYS... return value.
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***************************************************************************/
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MMRESULT sndSetHandleData(HANDLE hDev,
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DWORD dwSize,
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PVOID pData,
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ULONG Ioctl,
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HANDLE hEvent)
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{
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OVERLAPPED Overlap;
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DWORD BytesReturned;
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WinAssert(hDev != NULL);
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memset((PVOID)&Overlap, 0, sizeof(Overlap));
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Overlap.hEvent = hEvent;
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//
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// Issue the IO control. We must wait with our own event because
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// setting the overlapped object to null will complete if other
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// IOs complete.
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//
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if (!DeviceIoControl(hDev,
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Ioctl,
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pData,
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dwSize,
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NULL,
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0,
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&BytesReturned,
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&Overlap)) {
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DWORD cbTransfer;
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//
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// Wait for completion if necessary
|
||
|
|
//
|
||
|
|
|
||
|
|
if (GetLastError() == ERROR_IO_PENDING) {
|
||
|
|
if (!GetOverlappedResult(hDev, &Overlap, &cbTransfer,
|
||
|
|
TRUE)) {
|
||
|
|
return sndTranslateStatus();
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
return sndTranslateStatus();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// We'd better peek alertably to flush out any IO
|
||
|
|
// completions so that things like RESET only
|
||
|
|
// return when all buffers have been completed
|
||
|
|
//
|
||
|
|
// This relies on the fact that SleepEx will return
|
||
|
|
// WAIT_IO_COMPLETION in preference to OK
|
||
|
|
//
|
||
|
|
|
||
|
|
while (SleepEx(0, TRUE) == WAIT_IO_COMPLETION) {}
|
||
|
|
|
||
|
|
return MMSYSERR_NOERROR;
|
||
|
|
}
|