[wdmaudiodev] Re: Audio control for recording not possible???
- From: Ajai James <ajaijames@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Mon, 23 Sep 2002 17:34:17 -0700 (PDT)
Hi Jerry,
Thanks a lot for your suggestion and help. Can you explain a little bit more?
So do I need to use a custom made application(like control pannel) to change
the volume of the recorded file? This control communicates directly with the
filter driver which in turn communicates with the USB audio control firmware
which should change the DAC out put amplification, is it that way?
Also, is there any way posible to be in the firmware framework alone, and
change the volume, without modifying or adding the host driver part?
Thanks to you a lot again..
Ajai
ajaijames@xxxxxxxxx
"Jerry J. Trantow" wrote:
You can always write and install a filter driver which communicates to
the audio control. Then use DeviceIOControl from some type of control
panel to send messages to the driver which converts it to the
appropriate USB command.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Ajai James
Sent: Monday, September 23, 2002 1:54 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Audio control for recording not possible???
Hi friends,
I am using an Ez USB board to prepare a demo audio project.I have a
requirement to increase the volume of my recorded wav file depending on
the buttons on my kit, ie vol up and down. The enumeration is ok now,
and the firmware keeps on pumping the hard coded sine tone values to
the host.So, after selecting th enumerated board as a recording device,
I can record the sine tone. Now, i want to change the volume of the sine
tone using my boards f1, f2 push buttons. I thought I could use the
control end point with Vol up, vol down for that. But it does not seem
to work.
On going through microsoft documentation
,http://www.microsoft.com/hwdev/tech/input/audctrl.asp
it seems that audio controls are supported for play back only, not
recording..
Am i correct in this assumption? any way to implement this without using
the audio controls
Thanks a lot, for your kind suggestions and comments ...
Ajai James
---------------------------------
Do you Yahoo!?
New DSL Internet Access from SBC & Yahoo!
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe:
mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.de/
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.de/
---------------------------------
Do you Yahoo!?
New DSL Internet Access from SBC & Yahoo!
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.de/
Other related posts:
