NTSTATUS WdmAudOpenSysAudioDevices	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PWDMAUD_DEVICE_EXTENSION	DeviceExtension
	)
Definition at line 89 of file deviface.c.
Referenced by WdmAudInstallDevice().
{
    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;
}
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