[wdmaudiodev] for help in implementation virtual audio driver
- From: Weiji Zheng <weiji_zheng@xxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 20 Jul 2006 12:49:08 +0800 (CST)
Hi
I am developing one project, that is, PCM data is transfered into MSVAD by
usr mode, and MSVAD then put these PCM data into another application based on
DirectSound, such as Skype, that means MSVAD will be open simultaneously both
the applications.
Actaully, I encounter the same question as following:
1. how can I get the handle of the MSVAD(Simple)?
2. I tried to use IoRegisterDeviceInterface() in AddDevice() of MSVAD(Simple),
and then in my user mode application I use SetupDiGetDeviceInterfaceDetail()
and CreateFile() to get the handle of the MSVAD device. It seems that I can get
the handle of the MSVAD(Simple), but the Graph Edit con not find any device
about MSVAD, Do you have any idea about this?
Maybe the implementation in IRP_MAJOR_CREATE is one key.
//dispatch function
extern "C"
NTSTATUS
PCP_Create
(
IN PDEVICE_OBJECT pDeviceObject,
IN PIRP pIrp
)
{
PIO_STACK_LOCATION IrpStack = IoGetCurrentIrpStackLocation(pIrp);
//PDEVICE_EXTENSION pDevExt =
(PDEVICE_EXTENSION)pDeviceObject->DeviceExtension;
NTSTATUS ntStatus = STATUS_SUCCESS;
DPF(D_TERSE, ("[enter PCP_Create]"));
DbgPrint("the Flags is 0x%x\n", pIrp->Flags);
DbgPrint("the RequestorMode is 0x%x\n", pIrp->RequestorMode);
if(pIrp->RequestorMode == 0x1) //my own application
{// Complete successfully
pIrp->IoStatus.Status = STATUS_SUCCESS;
pIrp->IoStatus.Information = 0;
IoCompleteRequest(pIrp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
else //Graph Edit
{
//
// Pass the IRPs on to PortCls
//
ntStatus = PcDispatchIrp( pDeviceObject, pIrp );
if(NT_SUCCESS(ntStatus))
DbgPrint("success to open device\n");
else
DbgPrint("fail to open device\n");
return ntStatus;
}
}
But when I run own application(not Graph Edit), the system crash!
so would you please give me some advice.
thanks for any help.
best regards
--weiji zheng
---------------------------------
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