Thanks Matthew for your prompt response!
Can I clarify please:
- Do you know in fact that MS Teams sets AUDCLNT_STREAMOPTIONS_RAW and
thus disables non-essential processing?
- Is there a tool/technique that I can use to inspect/confirm that MS
Teams does this?
- IF it's the case that Teams does indeed set
the AUDCLNT_STREAMOPTIONS_RAW property, am I out of options? Any
workaround?
Thanks again for your help.
Culann
On Tue, 19 Oct 2021 at 21:20, Matthew van Eerde <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
As to the “how:”
There are two ways for apps to influence what kind of processing is
applied to their streams.
One way, as you mention, is to use AUDCLNT_SHAREMODE_EXCLUSIVE. This is
generally discouraged, for various reasons.
Another way is to fill up an AudioClientProperties object and pass it to
IAudioClient2::SetClientProperties. One of the properties that a client can
set is AUDCLNT_STREAMOPTIONS_RAW which will also disable non-essential
processing.
Windows-universal-samples/WASAPIRenderer.cpp at main ·
microsoft/Windows-universal-samples · GitHub
<https://github.com/microsoft/Windows-universal-samples/blob/main/Samples/WindowsAudioSession/cpp/WASAPIRenderer.cpp>
// Opt into HW Offloading. If the endpoint does not support offload
it will return AUDCLNT_E_ENDPOINT_OFFLOAD_NOT_CAPABLE
AudioClientProperties audioProps = {0};
audioProps.cbSize = sizeof( AudioClientProperties );
audioProps.bIsOffload = m_DeviceProps.IsHWOffload;
audioProps.eCategory = AudioCategory_Media;
if (m_DeviceProps.IsRawChosen && m_DeviceProps.IsRawSupported)
{
audioProps.Options = AUDCLNT_STREAMOPTIONS_RAW;
}
hr = m_AudioClient->SetClientProperties( &audioProps );
As to the “why:” that’s a good question, but you would need to ask the
Teams folks.
*From:* wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx>
*On Behalf Of *Culann mac Cabe
*Sent:* Tuesday, October 19, 2021 1:04 PM
*To:* wdmaudiodev@xxxxxxxxxxxxx
*Subject:* [EXTERNAL] [wdmaudiodev] SFX APO doesn't work when MS Teams
runs :(
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Hello wdmaudiodev people!
I have developed an APO which I instantiate as an SFX (one of its features
is that it changes channel count from input->output and so I can't use it
as an EFX).
I use it all the time: to watch and hear things on YouTube, Netflix, my
favourite Music Player etc etc I have noticed that, when using the
Microsoft Teams App, I get no APO and I want to understand why or how best
to find out.
I recalled a previous thread to the effect that when an audio endpoint
device (typically a USB Headphone) is configured in Exclusive Mode, APOs
may not be instantiated and so I made sure to disable this check box...
still no APO.
So: can anyone explain to me please:
How/why it is that Teams prevents, in some way, the "usual" behaviour of
my APO, even when I ensure to disable Exclusive Mode?
- APO is [1, 2, 5.1, 7.1]-channel In -> 2ch Out
- I install it as an SFX
Thanks!
Culann
