Re: Issue with Video rendering capabilities.

On a low-power device like yours, you'll probably need to do quite a bit of
fine tuning to get the performance you are looking for. I think it can be
done, but just as a disclaimer I want to point out that the newsgroups may
not provide the depth of focused help you'll need... :-)

Now on to the next steps. There are similar devices out there that can
render high-quality WMV from disk, but I think they've addressed at least
one of the three trouble spots (PIO-mode disk access, SW decoding, and emul
BLTs to the display) with HW. You need to do some profiling to figure out
where you're spending your time. You can learn how to use the Monte Carlo
profiler here:

http://msdn.microsoft.com/library/en-us/wcedebug5/html/wce50conMonteCarloProfiling.asp?frame=true

It will give you an ordered list of functions in your output window, and
will show you where you are spending the most time. I expect you'll see the
PIO-mode stuff in there, and/or SW decode and the emul BLT routines. Each
of these could be mitigated, respectively, by DMA, HW decode, and HW
overlays. I would start with the top of the list and go from there.

Thanks,
Damon
--
damonb@xxxxxxxxxxxxxxxxxxxx (Remove the 'online.' from my address to reach
me.)

This posting is provided "AS IS" with no warranties, and confers no rights.
______________________________

The Windows CE 5.0 documentation is online at:
http://msdn.microsoft.com/library/en-us/wceintro5/html/wce50oriWelcomeToWindowsCE.asp?frame=true


"Jegan" <Jegan@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:B4FEED82-369A-43CF-960D-FF0485F1C1E4@xxxxxxxxxxxxxxxx
> Barry,
>
> Hard drive is operated by PIO method, so the effective data transfer rate
> can be upto 16MB/s. We were using Windows CE .Net 5.0.
>
> This problem persist even when the file resides in system memory and the
> processor is taking almost 100% of processing time during this video
> rendering. Win CE is in hard real time mode, no debugger or KITL is
> involved
> during testing this video rendering.
>
> We knew that our display driver is using emulation libraries to do blt
> operation, so there is no 2D acceleration and We were using Microsoft WMV
> decoder to do video rendering. We couldn't find out which one of these
> component is taking more processing time. Any tips in finding the root
> cause
> could also be helpful.
>
> What we are trying to find out
> 1.) With increased h/w support, processor overheads can be shared, in this
> changed scenario can we say that for sure this problem will be solved?
> 2.) What is the performance specification of Microsoft WMV decoder (in
> terms
> of MIPS, expected data rate etc... ). This specification will help us to
> decide components for the hardware design.
>
> Regards,
> Jegan
>
> "Damon Barry [MSFT]" wrote:
>
>> You played some high-quality wmv on your platform and the experience
>> didn't
>> meet your requirements, so you determined there were two problems:
>>
>> 1. hard disk read latency
>> 2. performance wrt rendering to the display
>>
>> Did you do some testing to narrow it down to these two issues, or is that
>> an
>> educated guess? If you're sure these are the problems, then your
>> solutions
>> would certainly yield benefits. But you'll want to be sure you're
>> addressing the right problems.
>>
>> I'll have to look for technical articles; I don't know of anything off
>> hand.
>> But for your HW decoder I suspect you'll want to write or acquire a DShow
>> Filter or a DMO that fits into the DShow filter graph and communicates
>> down
>> to the hardware. And the display accelerators would go into the display
>> driver.
>>
>> Have you confirmed that DMA is enabled for the hard drive? Also which
>> version of CE is this?
>> --
>> damonb@xxxxxxxxxxxxxxxxxxxx (Remove the 'online.' from my address to
>> reach
>> me.)
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>> ______________________________
>>
>> The Windows CE .NET documentation is online at:
>> http://msdn.microsoft.com/library/en-us/wceintro5/html/wce50oriWelcomeToWindowsCE.asp?frame=true
>>
>>
>> "Jegan" <Jegan@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> news:A1E53883-257B-48F0-B099-BE0EC66D347D@xxxxxxxxxxxxxxxx
>> > Hi,
>> >
>> > We have an requirement to play DVD quality video content (wmv) in
>> > xScale
>> > PXA263 processor with QVGA LCD display. We aren't very satisfied with
>> > the
>> > performance. This WMV exist in a PCMCIA based 5GB hard disk. we are
>> > looking
>> > at enhancing the performace by
>> >
>> > 1.) Adding MPG or WMV hardware decoder (Like intel G2700 etc.)
>> > 2.) Adding display hardware accelerators (bit blt acceleration).
>> >
>> > This changed solution looks promizing to us, what is your take on this
>> > issue?
>> >
>> > How to make WMP to use MPG or WMV hardware decoding instead of using
>> > software decoderds? And Point to good technical articles and/or sample
>> > code
>> > that talk about this feature?
>> >
>> > Data transfer between the hard disk and system memory is also a concern
>> > and
>> > any suggestion in this area will also be useful.
>> >
>> > Regards,
>> > Jegan
>>
>>
>>


.

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