[wdmaudiodev] Re: Windows Media 9
- From: "Van Mieghem, Dirk" <dvm@xxxxxxxx>
- To: "'wdmaudiodev@xxxxxxxxxxxxx'" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 17 Oct 2002 20:19:33 +0200
Hello Martin,
good to hear from you again :)
It isn't clear to me why KMixer needs to be inserted/deleted on the fly in
all cases. I agree that there's no other choice if the hardware exposes a
single instance render pin but what if the hardware supports multiple
instances? Isn't the decision to insert KMixer dependent on a particular
instance then? All of this is currently possible with KMixer and
applications bypassing KMixer. If for instance Sonar is using our hardware
then we can still support KMixer at the same time because the render pin
supports multiple clients, even different API's (legacy MME, ASIO and GSIF).
Actually, all of this would be a moot point if every possible scenario would
work correctly in KMixer but in reality, it doesn't. Even if we want to do
something about it, we usually can't, because the miniport driver is
extremely dumb in the current model.
Personally, I thought WDM/KS would bring very low latency render/capture
devices to user-mode DirectShow but some critical requirements are still
missing...that's another discussion though.
Thanks,
Dirk
> -----Original Message-----
> From: Martin Puryear [mailto:martinpuryear@xxxxxxxxxxx]
> Sent: Thursday, October 17, 2002 7:06 PM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: Windows Media 9
>
>
>
> Hi Dirk,
>
> We will be changing our surround format and multi-channel fold-down
> issue going forward for sure. This is a known issue.
>
> KMixer is connected to the driver at some standard format
> (48k stereo or
> something like that), but then ratchets to the requested
> format, if the
> driver supports it (unless I am recalling incorrectly). The problem
> with what you suggest is that today's KMixer can't be inserted/deleted
> on the fly. This is why we would have never promised that, but we did
> say that we would make things a lot more transparent between the app's
> requested format and the driver.
>
> Thanks,
> Martin Puryear (martinp@xxxxxxxxxxxxx)
> Development Manager, Audio/Video Devices Group
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Van
> Mieghem, Dirk
> Sent: Sunday, October 13, 2002 12:48 PM
> To: 'wdmaudiodev@xxxxxxxxxxxxx'
> Subject: [wdmaudiodev] Windows Media 9
>
>
>
> Hi all,
> anyone tested Windows Media 9 5.1/7.1 surround encoding/decoding
> already? It seems that KMixer gets really confused when a surround
> format is played and another playback stream has to be mixed
> in. The 2nd
> stream is completely garbled, is this a known issue on WXP/SP1?
>
> Why is it that a driver doesn't see the requested playback
> datarange in
> its intersection call? Why can't KMixer behave the same as for a
> recording stream? If the hardware supports the requested format then
> KMixer shouldn't be inserted. I believe this was once promised by
> Microsoft but no sign of it so far.
>
> Thanks,
> Dirk
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