[wdmaudiodev] Re: Win7 Dynamic Format Changes - Streaming Minidriver

  • From: Neetu Sand <neetu.freelist@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 14 Sep 2009 17:27:31 +0530

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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