[wdmaudiodev] Re: KSPROPERTY_STEPPING_LONG problem!

  • From: eric <esnothing@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 31 Mar 2010 21:18:29 +0800


After a quick experiment, using KSPROPERTY_MEMBER_RANGES makes the volume
control disabled. I found Mark ran into the same problem before:
what Michail said seems to refer to the same scenario. Nevertheless, I still
believe there is an answer in front of us, if any body had this issue solved
or just had a normal behavior luckily in avstream architecture and under XP
sp2, please leave a messge to us~ Thanks in advance.

2010/3/31 Tim Roberts <timr@xxxxxxxxx>

>  eric wrote:
> Hello Tim,
>        Sorry for describing the problem such unclear and make many
> mistakes.  I might be exhausted,...anyway. Let me make it much detailed.
> The hardware's volume setting range is from 0 to 49 in decimal, therefore, I
>  set the KSPROPERTY_STEPPING_LONG as I wrote in previous email in order to
> make the code simpler even though the value should be set to a reasonable
> value in db level. However, when I scroll the volume control to it's lowest
> position, the 'Data' I got in the SetVolume() always is a strange value
> -2147483648. In addition, every step's value is not linear as  list like
> 49(uppermost), -5676, -7XXX, -9XXX,......, -2147483648(lowest value). What I
> must say is this setting in Win7 is workable, every step will honor my
> setting as 49, 48, 47....3, 2, 1, 0. and I do not implement a mute node.
> I can't see any reason for this behavior.  As an experiment, have you tried
> --
> Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.

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