94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
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//---------------------------------------------------------------------------
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//
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// Module: vsd.cpp
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//
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// Description:
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//
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// Virtual Source Data Class
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//
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//@@BEGIN_MSINTERNAL
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// Development Team:
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// Mike McLaughlin
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//
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// History: Date Author Comment
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//
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// To Do: Date Author Comment
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//
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//@@END_MSINTERNAL
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (c) 1996-1999 Microsoft Corporation. All Rights Reserved.
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//
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//---------------------------------------------------------------------------
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#include "common.h"
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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CVirtualSourceData::CVirtualSourceData(
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PDEVICE_NODE pDeviceNode
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)
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{
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LONG lLevel, i;
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cChannels = 2;
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MinimumValue = (-96 * 65536);
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MaximumValue = 0;
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Steps = (65536/2);
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GetVirtualSourceDefault(pDeviceNode, &lLevel);
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for(i = 0; i < MAX_NUM_CHANNELS; i++) {
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this->lLevel[i] = lLevel;
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}
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}
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NTSTATUS
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GetVirtualSourceDefault(
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IN PDEVICE_NODE pDeviceNode,
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IN PLONG plLevel
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)
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{
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PKEY_VALUE_FULL_INFORMATION pkvfi = NULL;
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NTSTATUS Status = STATUS_SUCCESS;
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UNICODE_STRING ustrName;
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HANDLE hkey = NULL;
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// Set the default volume level on virtualized pins. (0 dB attenuation)
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*plLevel = (0 * 65536);
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// Need to convert the filtername (symbolic link name) to a unicode string
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RtlInitUnicodeString(&ustrName, pDeviceNode->GetDeviceInterface());
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Status = IoOpenDeviceInterfaceRegistryKey(&ustrName, KEY_READ, &hkey);
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if(!NT_SUCCESS(Status)) {
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goto exit;
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}
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// Now we can go get the FriendlyName value
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Status = QueryRegistryValue(hkey, L"VirtualSourceDefault", &pkvfi);
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if(!NT_SUCCESS(Status)) {
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goto exit;
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}
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if(pkvfi->Type != REG_DWORD && pkvfi->Type != REG_BINARY) {
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Trap();
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Status = STATUS_INVALID_PARAMETER;
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goto exit;
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}
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if(pkvfi->Type == REG_BINARY && pkvfi->DataLength < sizeof(LONG)) {
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Trap();
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Status = STATUS_INVALID_PARAMETER;
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goto exit;
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}
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*plLevel = *((PLONG)(((PUCHAR)pkvfi) + pkvfi->DataOffset));
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exit:
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if(hkey != NULL) {
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ZwClose(hkey);
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}
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delete pkvfi;
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return(Status);
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}
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