NTSTATUS
OpenDevice(
IN LPWSTR Device,
OUT PHANDLE DeviceHandle,
OUT PFILE_OBJECT * FileObject)
{
NTSTATUS Status;
HANDLE hDevice;
/* now open the device */
Status = WdmAudOpenSysAudioDevice(Device, &hDevice);
if (!NT_SUCCESS(Status))
{
return Status;
}
*DeviceHandle = hDevice;
if (FileObject)
{
Status = ObReferenceObjectByHandle(hDevice, FILE_READ_DATA | FILE_WRITE_DATA, *IoFileObjectType, KernelMode, (PVOID*)FileObject, NULL);
if (!NT_SUCCESS(Status))
{
ZwClose(hDevice);
}
}
return Status;
}
MIXER_STATUS
Open(
IN LPWSTR DevicePath,
OUT PHANDLE hDevice)
{
if (WdmAudOpenSysAudioDevice(DevicePath, hDevice) == STATUS_SUCCESS)
return MM_STATUS_SUCCESS;
else
return MM_STATUS_UNSUCCESSFUL;
}
NTSTATUS
WdmAudOpenSysAudioDevices(
IN PDEVICE_OBJECT DeviceObject,
IN PWDMAUD_DEVICE_EXTENSION DeviceExtension)
{
NTSTATUS Status = STATUS_SUCCESS;
LPWSTR SymbolicLinkList;
SYSAUDIO_ENTRY * Entry;
ULONG Length;
HANDLE hSysAudio;
PFILE_OBJECT FileObject;
UNICODE_STRING DeviceName = RTL_CONSTANT_STRING(L"\\Device\\sysaudio\\GLOBAL");
if (DeviceExtension->DeviceInterfaceSupport)
{
Status = IoGetDeviceInterfaces(&KSCATEGORY_SYSAUDIO,
NULL,
0,
&SymbolicLinkList);
if (NT_SUCCESS(Status))
{
WdmAudOpenSysAudioDeviceInterfaces(DeviceExtension, SymbolicLinkList);
FreeItem(SymbolicLinkList);
}
Status = IoRegisterPlugPlayNotification(EventCategoryDeviceInterfaceChange,
PNPNOTIFY_DEVICE_INTERFACE_INCLUDE_EXISTING_INTERFACES,
(PVOID)&KSCATEGORY_SYSAUDIO,
DeviceObject->DriverObject,
DeviceInterfaceChangeCallback,
(PVOID)DeviceExtension,
&DeviceExtension->SysAudioNotification);
}
else
{
Entry = (SYSAUDIO_ENTRY*)AllocateItem(NonPagedPool, sizeof(SYSAUDIO_ENTRY));
if (!Entry)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
Length = wcslen(DeviceName.Buffer) + 1;
Entry->SymbolicLink.Length = 0;
Entry->SymbolicLink.MaximumLength = Length * sizeof(WCHAR);
Entry->SymbolicLink.Buffer = AllocateItem(NonPagedPool, Entry->SymbolicLink.MaximumLength);
if (!Entry->SymbolicLink.Buffer)
{
FreeItem(Entry);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = RtlAppendUnicodeStringToString(&Entry->SymbolicLink, &DeviceName);
if (!NT_SUCCESS(Status))
{
FreeItem(Entry->SymbolicLink.Buffer);
FreeItem(Entry);
return Status;
}
InsertTailList(&DeviceExtension->SysAudioDeviceList, &Entry->Entry);
DeviceExtension->NumSysAudioDevices++;
DPRINT("Opening device %S\n", Entry->SymbolicLink.Buffer);
Status = WdmAudOpenSysAudioDevice(Entry->SymbolicLink.Buffer, &hSysAudio);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to open sysaudio %x\n", Status);
return Status;
}
/* get the file object */
Status = ObReferenceObjectByHandle(hSysAudio, FILE_READ_DATA | FILE_WRITE_DATA, IoFileObjectType, KernelMode, (PVOID*)&FileObject, NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to reference FileObject %x\n", Status);
ZwClose(hSysAudio);
return Status;
}
DeviceExtension = (PWDMAUD_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
DeviceExtension->hSysAudio = hSysAudio;
DeviceExtension->FileObject = FileObject;
}
return Status;
}
