[wdmaudiodev] Re: Win7 Dynamic Format Changes - Streaming Minidriver
- From: Neetu Sand <neetu.freelist@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 18 Nov 2009 14:25:23 +0530
Hi,
I am still trying to figure our a way to implement dynamic format changes
support on Win7. I tried to implement events on filter as well as on pins in
the streaming minidriver. I am not able to see those events in KSStudio -
Does KSStudio show events exposed correctly? I might not be looking at the
correct place so please advice where the events are shown in KSStudio.
Also I call StreamClassDeviceNotification from filter whenever there is
change from device but I don't get any queries from class driver where my
driver can report new format. I see two possibilities:
- My driver is not exposing the events properly. Here I am assuming that
streaming minidriver has full support for events.
- StreamClassDeviceNotification is not working correctly because there is
problem in parameter passed or something else.
Here is what I am doing:
- Defining Event set and Event Item.
- Reporting these events in SRB_GET_STREAM_INFO.
- When there is a change from device side, calling
StreamClassDeviceNotification with SignalMultipleDeviceEvents.
The above does not work. I appreciate any suggestions.
Thanks, Neetu.
On Mon, Sep 14, 2009 at 5:27 PM, Neetu Sand <neetu.freelist@xxxxxxxxx>wrote:
> Hi,
>
> Thanks for your suggestions. I will try them out and let you know how it
> goes.
>
> Thanks, Neetu,
>
> On 9/12/09, AI Developer <developer@xxxxxxxxxxxxxxxx> wrote:
> > Three things come to mind:
> >
> > a. Seems like you should specify the event on the device(filter) not the
> > stream(pin) - that's what the documentation you refer to says(it talks
> about
> > automation table of the filter descriptor, not of pin descriptor). And
> > correspondingly should be calling StreamClassDeviceNotification.
> >
> > b. Note that MyEventHandler is called to "enable" the event. It simply
> means
> > that "somebody" is interested in listening to your events. For AVStream
> > drivers (and I assume also for Stream class minidrivers), this is
> optional.
> >
> > c. Once you set things up, examine your filters with KsStudio (or
> whatever
> > they have for Win7!), to make sure your events are being exposed
> properly.
> > You may use existing PortClass mini-port drivers(or samples) for
> > comparison. You can perhaps even register for, and verify that the
> events
> > are being fired properly with KsStudio (or some other tool).
> >
> > Thanks.
> > Devendra.
> >
> > Neetu Sand wrote:
> >>
> >> Hi,
> >>
> >> Thanks for your responses.
> >>
> >> @Karthik - I already saw that post and am doing things the way they
> >> describe.
> >>
> >> @Tim - Yes, We should be notifying the event whenever there is a
> >> format change from driver side but we should be receive the format
> >> changes event from class driver as well. At least this is my
> >> interpretation based on the following link:
> >>
> >> http://msdn.microsoft.com/en-us/library/dd573912.aspx
> >>
> >> where it says:
> >> "In the preceding code example, the MyEventHandler custom event
> >> handler must monitor the KSEVENT_PINCAPS_FORMATCHANGE event .."
> >>
> >> Also I am making sure that I call "StreamClassStreamNotification" from
> >> streaming minidriver whenever there is a format change but class
> >> driver does not seem to enumerate format again.
> >>
> >> Let me know what you think.
> >>
> >> Thanks, Neetu.
> >>
> >> On 9/10/09, Neetu Sand <neetu.freelist@xxxxxxxxx> wrote:
> >>
> >>>
> >>> Hi,
> >>>
> >>> I am trying to implement code so that our driver can report new format
> >>> capabilities under Win 7 using "Dynamic format changes". Our audio
> >>> driver
> >>> has been written using "Streaming minidriver" model. So I am using
> >>> KSEVENT_PINCAPS_FORMATCHANGE event to implement this. In order to do
> this
> >>> I
> >>> do the following in audio minidriver:
> >>>
> >>> - Added KSEVENT_TABLE with a KSEVENT_ITEM entry for
> >>> KSEVENT_PINCAPS_FORMATCHANGE.
> >>> - Added KSEVENT_SET_TABLE with a KSEVENT_SET entry for
> >>> KSEVENTSETID_PinCapsChange.
> >>> - Added event details in structure- HW_STREAM_INFORMATION.
> >>> - Implemented StrMiniEvent.
> >>> - Provided "HwEventRoutine" in Open Stream call.
> >>>
> >>> I am not receiving any event callbacks from class driver so I am
> >>> wondering
> >>> if I am doing something wrong here. Any help is appreciated.
> >>>
> >>> Thanks, Neetu.
> >>>
> >>>
> >>
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