WASAPI backend doesn't support exclusive mode?

[laiyonghao]

Hello,

I added RTAUDIO_HOG_DEVICE to StreamOptions object, but my application doesn't worked on EXCLUSIVE MODE.

    RtAudio::StreamOptions so;
    so.flags =  RTAUDIO_MINIMIZE_LATENCY | RTAUDIO_SCHEDULE_REALTIME | RTAUDIO_HOG_DEVICE;

I read the RtAudio.cpp file and found AUDCLNT_SHAREMODE_SHARED is passed to renderAudioClient->Initialize(),

renderAudioClient->Initialize( AUDCLNT_SHAREMODE_SHARED,
                                          AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
                                          desiredBufferPeriod,
                                          desiredBufferPeriod,
                                          renderFormat,
                                          NULL );

Should be use AUDCLNT_SHAREMODE_EXCLUSIVE here, and do other changes accordingly, when RTAUDIO_HOG_DEVICE is set to so.flags?

compiler: VC2013
OS: Windows 7 SP1
RtAudio: 5.0.0

[MarcusTomlinson]

The WASAPI backend does not currently support exclusive mode. No promises, but I'll see if I can get to it over the weekend.

[garyscavone]

To be honest, I don’t think the HOG_DEVICE flag has ever been fully supported in RtAudio. The flag was created during design stages but actual implementation turned out to be difficult or impossible in many cases. I vaguely recall testing it (10 years ago or more) in OS-X, where it seemed like the API would support it, and found that it didn’t work.

…

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[angryoctopus]

Is there any progress on this? I would really like to get to get the audio latency down and it seems this is the only way to get anything below 10ms. Apparently for pro audio you need to use the IAudioClient3::Initialize to set the actual OS buffer size.

[MarcusTomlinson]

No progress, no. It’s not even been on my radar to be honest. I’ll add it to my todo then. Of course, if you’d like to give it a go @angryoctopus, I’d be happy to review.

[angryoctopus]

I might take a look and see if I can figure it out.

[sonoro1234]

smallest latency in windows happens with ASIO.

[angryoctopus]

I'm aware you can get low latency with ASIO but it does put a burden on the end user to install/configure ASIO drivers.

[Abhishek0815]

@MarcusTomlinson pls update if it is fixed? in desperate need of help. I am using rtAudio for my project.I needed MicRaw signal(without any APO effects) ,"WASAPI exclusive mode" capture seems only option.

thanks