[wdmaudiodev] 回复： Re: for help in implementation virtual audio driver
- From: Weiji Zheng <weiji_zheng@xxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 20 Jul 2006 14:09:13 +0800 (CST)
Hi, Vargheese
firstly, thanks for your so warm help. but I have some a little puzzle, and
what do you mean as following:
in adddevice:
// Tell the class driver to add the device.
//
ntStatus =
PcAddAdapterDevice
(
DriverObject,
PhysicalDeviceObject,
PCPFNSTARTDEVICE(StartDevice),
MAX_MINIPORTS,
0 );
.....................
ntStatus = IoCreateDevice(
DriverObject, // our driver object
sizeof(DEVICE_EXTENSION), // extension size for us
NULL, // name for this device
FILE_DEVICE_UNKNOWN,
FILE_AUTOGENERATED_DEVICE_NAME,
FALSE, // Not exclusive
&deviceObject); // Our device object
..............
IoAttachDeviceToDeviceStack(deviceObject,
PhysicalDeviceObject);
................
IoCreateSymbolicLink();
................
but can I call simultaneously both PcAddAdapterDevice and IoCreateDevice?
if the answer is YES, but how do I distinguish IRP in IRP_MAJOR_CREATE?
actaully both the kernel and my own application call this function.
aside, another question, how does adapter driver get the buffer pointer of
miniport driver? I will use IOCTL to transfer PCM data from/to miniportstream.
thanks again.
--weiji zheng
Vargheese Baby <vargheese.baby@xxxxxxxxxxxxxxx> 写道：
v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);}
st1\:*{behavior:url(#default#ieooui) } Hi Weiji,
I tried “IoRegisterDeviceInterface()” with MSVAD. Its not working for me.
The following method will help you.
In DriverEntry
First call PcInitializeAdapterDriver
Then assign your dispatch routines
In AddDevice
IoCreateDevice
IoCreateSymbolicLink
In Application
Open the handle by CreateFile()
Regards
Vargheese
---------------------------------
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Weiji Zheng
Sent: Thursday, July 20, 2006 10:19 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] for help in implementation virtual audio driver
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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---------------------------------
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