[wdmaudiodev] Re: MSVAD capture driver problem
- From: "Hirokazu Iwashita" <hiro.iwashita@xxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sun, 11 Jul 2004 23:46:57 +0900
Hello , Sam
Thank you for your reply.
I tried to use Microsoft Sound Recorder.
The scratchy sound occurs.
As you say, the problem is in my driver.
My driver has no hardware.
I use MSVAD simple driver sample program.
When I Allocate DmaBuffer, I set 440Hz PCM data to it.
I override CopyTo functin and do nothing in it.
Instead I add CopyFrom.
Then when CopyFrom is called, I simply copy from the 440Hz PCM data.
I don't modify about data output except this.
I don't know why the data becomes lack and how I get the state.
Thank you.
Best regards.
Hirokazu Iwashita
----- Original Message -----
From: "Sam Tertzakian" <sam@xxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Friday, July 09, 2004 4:25 AM
Subject: [wdmaudiodev] Re: MSVAD capture driver problem
> It sounds as if the device is being starved for data when the computer is
> very busy.
>
> Is your device interrupt driven or are you using polling? If polling, then
> you may have increase the priority of the thread or reorganize how the
> polling is done. If interrupt driven, you may have other problems.
>
> Also, I would try to use Microsoft Sound Recorder (in Accessories) to
> determine if the problem is an application problem or a driver problem.
>
> If you use Sound Recorder and the problem goes away, then the problem is
in
> your application. If not, then the problem is probably in your driver.
>
> If the problem is in the driver, then write out to the log every time you
> write data to the card. Then you can analyze to see if you are actually
> writing enough data at all times.
>
> So, in summary, you should determine if the problem is in the app or
driver.
> Then, should prove that you are not starving the card.
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of ?? ??
> Sent: Thursday, July 08, 2004 10:40 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] MSVAD capture driver problem
>
> Hello.
>
> I have a problem. Hope you can help me.
>
> I created the audio capture driver based on DDK's sample MSVAD.
> I implemented CopyFrom() to let it work as a capture driver.
> The driver outputs 440Hz sound which is PCM data 22.05kHz 16bits stereo.
> Also I created the DirectShow application.
> The application uses my driver as capture filter and renders the sound.
>
> Mostly my driver works fine.
> However when I start TaskManager, VolumeControl or IE in WinXP,
> the sound becomes scratchy or distorted.
> When virus scan also runs, it occurs.
> In a short time, it goes back.
> On investigation, it seems that it doesn't occur in Win2K.
>
> The sound is heard like the sample data shifts 1 byte.
> And just before the state, the driver becomes pause state a little while.
>
> What happens in my driver ?
> How can I prevent my driver from going to this state ?
>
> Best Regard,
> Hirokazu Iwashita
>
>
>
>
>
>
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