[wdmaudiodev] Re: setting sample rate in the control panel in Vista
- From: Hakon Strande <hakons@xxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sat, 27 Oct 2007 20:12:32 -0700
There is no supported/documented way to set the default device format
programmatically/dynamically from the device on Vista. This is a user
only setting on this OS version.
There have been many requests for this design to change and we are
looking into this for the next version of Windows (no - the next version
of Windows does not mean Service Pack 1) especially since it will be
required to properly support HDMI Audio sinks.
HakonS, Windows Sound Team PM
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Eugene Gavrilov
Sent: Saturday, October 27, 2007 6:09 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] setting sample rate in the control panel in Vista
Hi,
This question was being discussed some time ago, but I still was unable
to
find acceptable solution for the problem. I'm writing a driver
(AVStream-based) for Windows Vista that supports:
(1) dynamic sample rate change based on a switch located on the device
(2) external clock source, such as an external SPDIF-in connector
(3) sample rate change by using our vendor-provided control panel
All the events are processed by the driver successfully and it
updates the hardware parameters accordingly. It also sets KSDATARANGE
for the current sample rate in the KSFILTERFACTORY structure. This
works fine in Windows XP - as soon as new sample rate is detected
and an audio application is restarted, or as soon as it re-opens
the audio device (re-instantiates audio filter and/or pin), everything
is OK.
In Windows Vista this requires manual change of the preferred audio
format in the 'Sounds and audio' control panel. I found no way to
avoid this. I already tried the following:
1. The PKEY_AudioEngine_DeviceFormat property cannot be set without
administrative rights from a user-level control panel, moreover, this
does not always work.
2. PKEY_AudioEngine_OEMFormat is not documented, although it seems to
be required as well.
3. I cannot create a set of 'virtual subdevices' for each possible
sample rate, because this can only be done at install time in an INF
file, but we are using the same INF file for a wide range of our
devices,
and the list of sample rates is quite large. And this would require
significant development effort.
4. Restarting the device does not work either: if the device gets
sample rate change request, sets new sample rate, and then I go to
the Device Manager, disable the device and re-enable it, all
the KS structures and data ranges are set properly by our driver
(with a single sample rate that is currently selected), but Windows
Vista still remembers previous setting and refuses to
playback/record audio. In the 'Sounds and audio' control panel Vista
shows two sample rates, old and new, old is selected. As soon as I
select new sample rate and close the control panel, everything's ok,
and after that the old sample rate disappears from the list.
5. I guess using IUregisterSubdevice is not applicable for AVStream
drivers.
> You should use IUnregisterSubdevice and IUnregisterPhysicalConnection
for this
> (see portcls.h) and you should unregister/register subdevices and
physical
> connections in the following order
6. I tried KsFilterFactorySetDeviceClassesState, too - it returns
STATUS_SUCCESS, all WinMM/DSound clients are reset and new topology is
successfully created, but the control panel still displays old sample
rate and audio playback/recording fail. After I choose correct sample
rate manually, playback/recording are OK.
7. I tried KsFilterFactoryUpdateCacheData. No success. (I'm not sure
if this function is related to the problem).
Any hints or advice, please? I wonder why even after driver is
unloaded and re-loaded, and a new KS topology with new data ranges is
built, the Control Panel is still using cached values for the current
audio format, and this cannot be avoided. By the way, I noticed at
least one more strange thing: when the 'advanced' tab is opened, the
control panel enumerates all the formats (driver's intersection
handler is called), however, it does only enumerate 8, 16 and 24-bit
formats, but not 32. Our hardware is using 32 bit (24-bit data in
32-bit containers).
Regards,
Eugene Gavrilov
Senior Software Engineer,
CEntrance, Inc.
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