[wdmaudiodev] Re: setting sample rate in the control panel in Vista
- From: "Chris W" <kazanw@xxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sun, 28 Oct 2007 16:31:37 +0100
There is very simple way to set default format in Vista:
- set value PKEY_AudioEngine_DeviceFormat
- set value PKEY_AudioEngine_MixFormat
Both values are type VT_BLOB, value WAVEFORMATEXTENSIBLE.
Mixer in Vista is 32 bit - you should set properly
nAvgBytesPerSec,nBlockAlign,wBitsPerSample,Samples.
Use GetValue function and cast pBlobData for WAVEFORMATEXTENSIBLE to look
how system do it.
Chris W.
PS. Setting default device is even simpler.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Hakon Strande
Sent: Sunday, October 28, 2007 4:13 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: setting sample rate in the control panel in Vista
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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