WP8 WASAPI Low Volume Audio Recording Problem on VOIP App

Hello,
I am working on a VOIP app and WASAPI is used for the app. I am using WASAPI in SHARED_MODE. Captured audio frames are turned out to be in low volume. For some devices, the audio volume is almost silent (Specially for Lumia 730).
From the VOIP app documentation, i found out that only ISimpleAudioVolume is supported for volume control for Windows Phone. (Ref: https://msdn.microsoft.com/en-us/library/windows/apps/jj715884(v=vs.105).aspx). But ISimpleAudioVolume::GetMasterVolume(float
*pfLevel) always returns pfLevel=1.0
Volume level in other VOIP apps like Skype,Viber seems normal. So, i am wondering what's wrong is going on??
Thanks,
Haider

Hi haiderBd,
In fact, Only ISimpleAudioVolume API is supported for Windows Phone 8. IAudioStreamVolume or IChannelAudioVolume is not supported for Windows Phone 8. Am i right or i have missed something else?
-> Yes, you are correct, if you read carefully about the Requirements section, you should be able to find that ISimpleAudioVolume supported on Windows Store App, but it also mentioned does not supported on Windows Phone 8, which means the API is acceptable
for Windows Store App for instance PC and tablet.
Again, IChannelAudioVolume only support on Windows Desktop, which means the api can be only used in desktop development for instance WPF, winform and etc...
What could be the reason for low volume recording? Is there any way to increase the volume?
-> I'm not that familiar with WASAPI, perhaps related with Share Mode? Try with exclusive mode to see if listening to one audio endpoint device while recording.
I will also try to find some experts to help you with this question.
--James
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WP8 WASAPI Low Volume Audio Recording Problem on VOIP App

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