[wdmaudiodev] Re: SCMS support
- From: KS <wakeup1504@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 17 Jul 2009 14:56:23 +0800
Hi,
I'm looking at supporting SCMS on SPDIF-In and SPDIF-Out and was looking for
any information on how the OS would make calls to
KSPROPERTY_AUDIO_COPY_PROTECTION to trigger the copy protection based on the
content playing.
So am I correct to say that current, as the OS does not do the detection on
content that requires copy protection, it is up to the individual driver to
detect the SPDIF preamble and enable the necessary steps to fulfill the SCMS
copy protection? In Windows 7, if I support the
KSPROPERTY_AUDIO_COPY_PROTECTION, how do I trigger Media Center to use it?
Thanks.
KS
On Thu, Jul 16, 2009 at 5:33 PM, Frank Yerrace
<Frank.Yerrace@xxxxxxxxxxxxx>wrote:
> The KSPROPERTY_AUDIO_COPY_PROTECTION property was never utilized by Windows
> audio APIs. I don't know if any custom audio drivers ever implemented this
> property, but I doubt it.
>
> Audio drivers should implement the content protection related functions
> described on MSDN at http://msdn.microsoft.com/en-us/library/ms789362.aspx.
> The newest Windows Logo Program requirements introduced in conjunction with
> Windows 7 for audio drivers require that the driver properly program SCMS
> parameters for SPDIF outputs and engage HDCP for HDMI outputs through this
> mechanism. Some of this MSDN documentation hasn't yet been updated and even
> the relevant Windows Logo Program Test Agreement Exhibit B text is a bit
> incomplete. We are in the middle of updating both of those items. In the
> meantime, I can help answer questions in this area or direct you to others
> who can.
>
> From an application's point of view the above support is accessed through
> part of the Windows Media Foundation API and I'm not aware of any particular
> application that leverages this feature on Vista (but I could be wrong).
> Media Center on Windows 7 will utilize this in certain scenarios though.
>
> Was there a specific application or scenario you wanted to support?
>
> Frank Yerrace
> Microsoft Corporation
> 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 Tim Roberts
> Sent: Wednesday, July 15, 2009 9:35 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: SCMS support
>
> KS wrote:
> >
> > Does anyone knows how the Windows OS support SCMS? I've found this
> > KSPROPERTY call KSPROPERTY_AUDIO_COPY_PROTECTION which seems to be
> > related to SCMS, but there is not much documentation on the
> > expectation of this call and when the OS will make the call. I've
> > tried to support the call but does not receive any call from the OS on
> > this. Hope someone can help on this.
>
> What kind of device are you working with? SCMS applies to a very narrow
> range of devices (DAT and MiniDisc only, I think). Other devices use
> different copy protection mechanisms. Digital tuners have their own
> brand, and Media Center uses it to mark its streams as protected.
>
> --
> Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.
>
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