Frank/Jeff,
Thanks for the information. This is exactly what I'm doing -
returning S_FALSE and making the suggested input format 2-channel 48 kHz
float. I'm currently using Vista Beta 2 for my testing. Vista July
2006 (build 5472) seemed more unstable than Beta 2 (5384). DbgView
wouldn't even run on build 5472 because of some security issue with
trying to install a file in the /Windows/System32/Drivers directory.
However, it sounds like this was fixed more recently than even that
build, so I guess we'll have to wait for the next release of Vista to
verify if the problem is fixed. Does that sound right?
Thanks, Mike
My colleague Jeff Hoekman asked me to send this response on his behalf. Here is his response, verbatim:
Hi Mike,
We recently fixed this behavior, however, you should be able to get things working by returning S_FALSE and returning a suggested format of 32-bit float, 48k, and channel-count unchanged.
As of Winmain 5490.0.060731-1930, the SysFX APOs (GFX and LFX) will not be passed IO format pairs which require SRC or int<->float conversion, so it will be much easier for you to return S_OK or S_FALSE and specify the channelcount you desire.
Let us know if you have further questions.
-Jeff 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 Michael R. Preston Sent: Tuesday, August 01, 2006 7:27 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Windows Vista APO channel conversion question
Hi, all. I'm developing an APO for Windows Vista that will do some channel conversion in the LFX. For example, if you're playing a stereo MP3 or WMA file in Windows Media Player, and the system is in 8-channel speaker mode, I want the LFX to be in control of how the channel conversion happens. However, using Vista Beta 2, I'm having trouble setting the input format the way I want. I'm playing a 44.1 kHz MP3 or WMA file in Windows Media Player, and I'm on a system where the audio hardware is locked to 48 kHz. In IsInputFormatSupported(), I can see how Windows is trying to open the LFX. Since the system is in 8-channel
mode, the output format is always 8 channels at 48 kHz to match the hardware. However, looking at the input format, Windows either wants me
to sample-rate-convert the audio from 44.1 kHz to 48 kHz while allowing me to do the channel conversion, or Windows does the sample-rate-conversion and channel conversion for me before getting to my LFX. Why isn't there a 3rd option - let Windows do the sample-rate-conversion, and let my LFX do the channel conversion? Anyone have any info on this?
Thanks, Mike Preston
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Mike Preston | Home/Office: (360)756-1655 | | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | The man who follows the crowd will usually get no | | further than the crowd. The man who walks alone is | | likely to find himself in places no one has ever been. | | -- Alan Ashley-Pitt | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ******************
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