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
<mailto: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
<mailto: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
<mailto: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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