[wdmaudiodev] Re: Usb Audio Driver
- From: "DJ Sisolak" <dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 17 Jul 2003 16:39:58 -0700
Hello Thomas,
Thanks for your input...
In answer to your list below...
1. USB Midi support .
I know there is Midi in XP and Me but that part is not working very
well (unplug problems). A USB audio device with Midi produces a blue
screen under W2000 and 98.
Further it might be a good idea to do the midi stuff in another
driver. I had really strange problems with USB Midi in XP until I
removed the Midi interface from the audio class and declared a custom
interface.
[DJ Sisolak] I have done a lot of work recently to upgrade the MIDI
support in my development version of the driver. This includes improved
handling of requests and support for MIDI Elements which may have been
the cause of your BSODs.
2. Support for the DFU class.
Since the DeviceFirmwareUpdate is already defined, This would simpify
upgrades. I managed that with a custom device descriptor and driver.
Get /Set Mem won't be a solution for upgrades but might be usefull to
download dsp code.
[DJ Sisolak] Good Point. I had forgotten about the DFU class. I will try
to pursue that internally. I hope to include the Get/Set Mem support in
the driver for whatever purpose it may suit for vendors.
3. Vendor Requests.
The possibility to send Control Requests (Vendor Requests) to a usb
audio device. This would simplify the impementation of unsupported
features (Mixers for example)
[DJ Sisolak] Mixers as well as all process units will be supported in an
upcoming version of the driver. It should also have a vendor request in
it.
4. backport of new features at least to W2000.
[DJ Sisolak] Can't promise anything here. I am just a dev :-) For
release information please follow up off of the reflector with
jacku@xxxxxxxxxxxxxx
5. a doc which parts of the spec are implemented.
[DJ Sisolak] I have already begun work on this.
6. 96k in halfduplex mode for Usb 1.1
or even better Usb 2.0 support.
[DJ Sisolak] I am not aware of anything that restricts you from doing
96KHz half-duplex, and some sort of USB 2.0 support is also in the plan.
Thanks,
DJ Sisolak
Microsoft Corp.
This posting is provided "AS IS" with no warranties, and confers no
rights.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Thomas Zepf
Sent: Thursday, July 17, 2003 1:20 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Usb Audio Driver
Hello DJ,
here my whishes based on my recend device.
1. USB Midi support .
I know there is Midi in XP and Me but that part is not working
very well (unplug problems). A usb audio device with Midi produces
a blue screen under W2000 and 98.
Further it might be a good idea to do the midi stuff in another
driver. I had really strange problems with USB Midi in XP until
I removed the Midi interface from the audio class and declared
a custom interface.
2. Support for the DFU class.
Since the DeviceFirmwareUpdate is already defined, This
would simpify upgrades. I managed that with a custom
device descriptor and driver. Get /Set Mem won't be a
solution for upgrades but might be usefull to download dsp code.
3. Vendor Requests.
The possibility to send Control Requests (Vendor Requests)
to a usb audio device. This would simplify the impementation
of unsupported features (Mixers for example)
4. backport of new features at least to W2000.
5. a doc which parts of the spec are implemented.
6. 96k in halfduplex mode for Usb 1.1
or even better Usb 2.0 support.
Thanks
Thomas
----- Original Message -----
From: DJ Sisolak <dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Wednesday, July 16, 2003 7:50 PM
Subject: [wdmaudiodev] Re: Usb Audio Driver
> Hello all,
>
> I know I am asking for trouble here :-) but what is it in the
> USBAudio.sys driver or the USB Audio standards that does not serve
your
> needs? Why do you find it necessary to create your own drivers? The
> reason I ask is that we are in the process of updating both the driver
> and the specifications.
>
> Thanks,
> DJ Sisolak
> Microsoft Corp.
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of
> bart@xxxxxxxxxxxxx
> Sent: Wednesday, July 16, 2003 6:24 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: Usb Audio Driver
>
> Hi,
>
> > I don't find the DDK say we can't use PortCls to implement USB Audio
> Driver.
> >
> You can do it, I also did :)
>
> > DDK say "The PortCls framework might also be useful for constructing
> drivers
> > for audio device on other hardware buses or for software only
> device.". So
> > PortCls may not wrong way to implement USB Audio Driver.
> >
> Somewhere else in the DDK it says that for USB sound devices you
should
> use a
> standard USB device structure. If you doing it another way, you don't
> get any
> examples from MS. I needed some ugly hacking to get it done anyway.
>
> Regards,
> Bart
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