[wdmaudiodev] Minidriver for Inserting Audio filter

  • From: Harish Kasiviswanathan <harish.kasiviswanathan@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 2 Mar 2005 15:40:49 -0500

Hello everyone,

We have an USB Audio device which supports only 8-bit 8Khz Mulaw.
Though microsoft documentation says USBAudio driver supports mulaw, it
doesn't work properly (confirmed by microsoft).

Now for work around we plan to do the following. Modify the device so
that it comes up as 16 bit PCM but it will send mulaw data.

I want to develop/insert a Minidriver so that it can convert the 16
PCM to Mulaw and vice-versa. So that all applications can use it as if
it is a 16 bit PCM device.

I would like to know what kind of minidriver to develop for e.g.
AVStream minidriver or something else. I would also like to know the
complexity of such a minidriver.

Any suggestion is welcome.


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  • » [wdmaudiodev] Minidriver for Inserting Audio filter