Regarding DXVA

NTDEV
1

Hello Experts.

I always see dxva is explained with display driver and graphics adapter.

Is there anything like dxva device without a display card? I mean can I
make my own device and driver which can do the jobs of accelerating the
decoding of video? If so, which stack does this fall under?

Thanks
Srikanth

2

xxxxx@wipro.com wrote:

I always see dxva is explained with display driver and graphics adapter.

Is there anything like dxva device without a display card? I mean can
I make my own device and driver which can do the jobs of accelerating
the decoding of video? If so, which stack does this fall under?

You can certainly create a hardware MPEG decoder; many companies have
done so. Such a device has an AVStream driver, and participates in
DirectShow graphs via the all-powerful ksproxy filter.

It wouldn’t be DXVA, however. DXVA is an extension to DirectX, and can
only be exposed as part of a complete DirectX driver, tightly coupled to
a dislay driver.

–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.

3

Thanks for the pointer Tim.

Isn’t ksproxy a directshow thing? I mean how will it work with Windows
Media Foundation which is the new video display stack in Vista?

_Srikanth

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Tim Roberts
Sent: Thursday, October 04, 2007 11:24 PM
To: Windows System Software Devs Interest List
Subject: Re: [ntdev] Regarding DXVA

xxxxx@wipro.com wrote:

I always see dxva is explained with display driver and graphics
adapter.

Is there anything like dxva device without a display card? I mean can
I make my own device and driver which can do the jobs of accelerating
the decoding of video? If so, which stack does this fall under?

You can certainly create a hardware MPEG decoder; many companies have
done so. Such a device has an AVStream driver, and participates in
DirectShow graphs via the all-powerful ksproxy filter.

It wouldn’t be DXVA, however. DXVA is an extension to DirectX, and can
only be exposed as part of a complete DirectX driver, tightly coupled to
a dislay driver.

–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.

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4

xxxxx@wipro.com wrote:

Thanks for the pointer Tim.

Isn’t ksproxy a directshow thing? I mean how will it work with Windows
Media Foundation which is the new video display stack in Vista?

Don’t know. Windows Media Foundation is more or less irrelevant at this
point. I assume Microsoft will supply a media source for WMF that
performs the same function that ksproxy serves for DirectShow. They
can’t afford to ignore the vast installed base of AVStream capture drivers.

–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.