VOID
NTAPI
WdmAudInitWorkerRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PVOID Context)
{
NTSTATUS Status;
PWDMAUD_DEVICE_EXTENSION DeviceExtension;
ULONG DeviceCount;
/* get device extension */
DeviceExtension = (PWDMAUD_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
/* get device count */
DeviceCount = GetSysAudioDeviceCount(DeviceObject);
DPRINT("WdmAudInitWorkerRoutine SysAudioDeviceCount %ld\n", DeviceCount);
/* was a device added / removed */
if (DeviceCount != DeviceExtension->SysAudioDeviceCount)
{
/* init mmixer library */
Status = WdmAudMixerInitialize(DeviceObject);
DPRINT("WdmAudMixerInitialize Status %x WaveIn %lu WaveOut %lu Mixer %lu\n", Status, WdmAudGetWaveInDeviceCount(), WdmAudGetWaveOutDeviceCount(), WdmAudGetMixerDeviceCount());
/* store sysaudio device count */
DeviceExtension->SysAudioDeviceCount = DeviceCount;
}
/* signal completion */
KeSetEvent(&DeviceExtension->InitializationCompletionEvent, IO_NO_INCREMENT, FALSE);
/* reset work item status indicator */
InterlockedDecrement((volatile long *)&DeviceExtension->WorkItemActive);
}
MIXER_STATUS
Enum(
IN PVOID EnumContext,
IN ULONG DeviceIndex,
OUT LPWSTR * DeviceName,
OUT PHANDLE OutHandle,
OUT PHANDLE OutKey)
{
PDEVICE_OBJECT DeviceObject;
ULONG DeviceCount;
NTSTATUS Status;
UNICODE_STRING KeyName;
/* get enumeration context */
DeviceObject = (PDEVICE_OBJECT)EnumContext;
/* get device count */
DeviceCount = GetSysAudioDeviceCount(DeviceObject);
if (DeviceIndex >= DeviceCount)
{
/* no more devices */
return MM_STATUS_NO_MORE_DEVICES;
}
/* get device name */
Status = GetSysAudioDevicePnpName(DeviceObject, DeviceIndex, DeviceName);
if (!NT_SUCCESS(Status))
{
/* failed to retrieve device name */
return MM_STATUS_UNSUCCESSFUL;
}
/* intialize key name */
RtlInitUnicodeString(&KeyName, *DeviceName);
/* open device interface key */
Status = IoOpenDeviceInterfaceRegistryKey(&KeyName, GENERIC_READ | GENERIC_WRITE, OutKey);
#if 0
if (!NT_SUCCESS(Status))
{
/* failed to open key */
DPRINT("IoOpenDeviceInterfaceRegistryKey failed with %lx\n", Status);
FreeItem(*DeviceName);
return MM_STATUS_UNSUCCESSFUL;
}
#endif
/* open device handle */
Status = OpenDevice(*DeviceName, OutHandle, NULL);
if (!NT_SUCCESS(Status))
{
/* failed to open device */
return MM_STATUS_UNSUCCESSFUL;
}
return MM_STATUS_SUCCESS;
}
NTSTATUS
GetSysAudioDevicePnpName(
IN PDEVICE_OBJECT DeviceObject,
IN ULONG DeviceIndex,
OUT LPWSTR * Device)
{
ULONG BytesReturned;
KSP_PIN Pin;
NTSTATUS Status;
PWDMAUD_DEVICE_EXTENSION DeviceExtension;
/* first check if the device index is within bounds */
if (DeviceIndex >= GetSysAudioDeviceCount(DeviceObject))
return STATUS_INVALID_PARAMETER;
/* setup the query request */
Pin.Property.Set = KSPROPSETID_Sysaudio;
Pin.Property.Id = KSPROPERTY_SYSAUDIO_DEVICE_INTERFACE_NAME;
Pin.Property.Flags = KSPROPERTY_TYPE_GET;
Pin.PinId = DeviceIndex;
DeviceExtension = (PWDMAUD_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
/* query sysaudio for the device path */
Status = KsSynchronousIoControlDevice(DeviceExtension->FileObject, KernelMode, IOCTL_KS_PROPERTY, (PVOID)&Pin, sizeof(KSPROPERTY) + sizeof(ULONG), NULL, 0, &BytesReturned);
/* check if the request failed */
if (Status != STATUS_BUFFER_TOO_SMALL || BytesReturned == 0)
return STATUS_UNSUCCESSFUL;
/* allocate buffer for the device */
*Device = AllocateItem(NonPagedPool, BytesReturned);
if (!Device)
return STATUS_INSUFFICIENT_RESOURCES;
/* query sysaudio again for the device path */
Status = KsSynchronousIoControlDevice(DeviceExtension->FileObject, KernelMode, IOCTL_KS_PROPERTY, (PVOID)&Pin, sizeof(KSPROPERTY) + sizeof(ULONG), (PVOID)*Device, BytesReturned, &BytesReturned);
if (!NT_SUCCESS(Status))
{
/* failed */
FreeItem(*Device);
return Status;
}
return Status;
}
