Performance Level

Question

Three questions about performance:

 

1) The Microsoft Validation tool 

The HD DVD forum performance document (http://www.dvdforum.org/images/HD_DVD-Video_Guideline20060828.pdf) is a great document to understand performance guidelines.  I notice that the Validator seems to be running a Player Performance Analysis, and I wonder... Is this analysis built from the DVD Forum Guideline above?

 

2) Performance Level

Annex W speaks of a Performance Class that is not accessable by API, and then references the pdf document above.  Is there a concept of player performance level (like a player of Performance Class 1 doesn't support x, y, z features and this could be monitored with code)?

 

3) Capapbility Parameters

Are these the only player support parameters that can be monitored through code?

Answer 1

I think the validator just looks at things like total # of XPath expressions or some other basic metric; there is no way to validate (eg) pixel buffer usage with static analysis.

 

There is a concept of a player performance level, and Performance Level 2 has been discussed in the forum. I don't think it has anything that impacts HDi though (it is about A/V decode and output requirements)

 

Finally, the parameters (and associated API properties) are indeed the only things you can monitor; there is no way to (eg) query what kind of CPU or how much RAM you have, etc.

Answer 2

Thank you Peter.