[wdmaudiodev] Re: USB audio filter dirver
- From: Doktor Schnipp <docschnipp@xxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 3 Jan 2003 14:37:13 +0100 (CET)
Hi,
I have a similar problem. I want to make a WDM MIDI
driver that runs under all win OS (98,ME,2k,xp).
I got USB already running and can play with the
endpoints. But how exactly can I make windows
recognize myself as what I am?
The samples in the DDK just offer examples for
existing buses, but not USB.
doc
P.S.: I know this is a newbie question but all of the
changing documentation of that stuff is pretty
irritating..
--- carsten schulz <carsten.schulz@xxxxxxxxxx>
schrieb: >
> Hi Frank,
>
> you can write a WDM filter driver that alters the
> audio data in the
> URB_FUNCTION_ISOCH_TRANSFER transfers. A good
> starting point is the
> filter driver example in the WDM book by Walter
> Oney.
>
> You can also provide GFX (global effects) filtering
> for audio capture
> and rendering streams. A GFX filter for a rendering
> stream, for example,
> might provide equalization, bass enhancement, or
> speaker correction. For
> more information, see GFX Filters in the DDK. AFAIK,
> GFX are only
> supported by Windows XP. I've never wrote a GFX
> myself, thus I can't
> tell you anything more about that...
>
> Hope this helps,
> Carsten
>
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