[wdmaudiodev] Re: Update for Capture Problem on WavePCI
- From: "Martin Garcia" <doraemonx7@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 29 May 2003 04:23:31 +0000
Hi, Jeff,
I am using CoolEdit Pro Special Edition 1.1. I don't know the build number.
I tried another driver I wrote a while back that also uses WavePCI . It uses
a totally different hardware architecture than the current card I work with.
But, that driver has the same problem! In that case, that driver also
passes WHQL, but this behaviour was not tested.
It is very unlikely, but possible, that I have same bug in both drivers. I
say unlikely because that code is substantially more complicated (and
different) due to the architecture of the card. In that case, I am allowing
the unused (and partially used) descriptors to be revoked.
I am certain that WaveCyclic does not exhibit this behaviour. I knew about
this problem when I went to WinHEC, but I thought it was just a bug I needed
to fix. Now, I regret not bringing the issue up.
Hmm...very strange that you don't use IPreFetchOffset. I will test it again
without using IPreFetchOffset. Perhaps it is just the KMixer sample rate
conversion that causes the problem.
>From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
>Reply-To: wdmaudiodev@xxxxxxxxxxxxx
>To: <wdmaudiodev@xxxxxxxxxxxxx>
>Subject: [wdmaudiodev] Re: Update for Capture Problem on WavePCI
>Date: Thu, 29 May 2003 13:06:56 +1000
>
>I don't use IPreFetchOffset.
>
>I just tried setting the sampling rate to 6kHz (which my card doesn't
>support in hardware) and the last buffer came back zero on XP, so it looks
>like you're right about it happening when the SRC gets hooked in.
>
>I also tried the same thing on both the inbuilt soundport on the
>motherboard
>and a Soundblaster PCI card. The soundport returned 0 bytes in the last
>buffer, but the Soundblaster returned it partially filled. I presume the
>soundport uses WavePCI and the Soundblaster uses WaveCyclic.
>
>What version of CoolEdit are you running? I'm using CoolEdit 2000 version
>1.1 Build 2418.
>
>The NT4 DDK provides a bit more information on the "correct" response to
>wave input and output state changes. For WAVE_DD_RESET (which is equivalent
>to KSSTATE_STOP) it says "cancels all input or output and sets the position
>to zero, but may complete outstanding read/write requests for the wave
>input/output devices". Looks like whether the last buffer gets anything in
>it or not was left optional.
>
>Jeff
>
>----- Original Message -----
>From: "Martin Garcia" <doraemonx7@xxxxxxxxxxx>
>To: <wdmaudiodev@xxxxxxxxxxxxx>
>Sent: Thursday, May 29, 2003 12:23 PM
>Subject: [wdmaudiodev] Re: Update for Capture Problem on WavePCI
>
>
> > Hi, Jeff,
> >
> > Well, I think if under XP you do not use IPreFetchOffset and/or allow
>KMixer
> > to do sample rate conversion, you will also have the problem under XP.
> >
> > The fact you are also having the problem under 2000 really concerns me.
> >
> > I was hopeful that if I only accept entire "packets" as you call them,
>that
> > the problem would go away. I just tried that. But the problem does not
>go
> > away. I also tried limiting the number of packets, but that did not make
>the
> > problem go away.
> >
> > I know that WaveCyclic model does not exhibit this behaviour...And, I
>know
> > that Legacy Drivers do not exhibit this behaviour.
> >
> > I am starting to worry that this is a WavePCI problem. I can tell you
>that
>I
> > have tried every possible way I can think of to get that last "big"
> > application buffer to come back with some data, but no matter what I do
> > (except using the IPreFetchOffset and disabling KMixer conversion under
>XP),
> > it will not come back with data.
> >
> > It is critical for us to run under Win2k because many of our customers
>do
> > so. We cannot use WaveCyclic (I don't want to get into that!) and many
>of
> > our customers are complaining about Legacy drivers.
> >
> > Amazingly, the driver passes WHQL tests...I am ready to go and certify
>it!
> > But, I need to use KMixer SRC and I need to run under 2k, and I really
>need
> > to get that last buffer!!
> >
> > At this point, it looks like I will have to live with the problem...but,
>I
> > guess I am surprised it has not come up before.
> >
> > Since there are now at least two people with the problem, I wonder if
> > someone from Microsoft has any input on this issue.
> >
> > Anyway, Jeff, I really appreciate your time...it has been very helpful
>in
> > narrowing down the problem and at least I have tried several avenues I
>had
> > not explored before.
>
>
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