Disabling AGC in Chrome 51

[Michael Graves]

Hello All,

We have a WebRTC-based audio application that requires that AEC be disabled. The AEC mangles outbound audio while in double-talk. So we force our users to wear a headset and turn off AEC. 

I'm given to understand that when AEC is disabled AGC is also disabled. See the comments here as evidence of this. 

However, what I experience is that the microphone gain is still being adjusted by the browser! It almost always goes up to 100% eventually.If there's any acoustic leakage from the user's headset the excessive mic level induces echo.

Q1: Is disabling AEC using googEchoCancellation = false; the definitive way to also disable AGC?

Q2: If not, how can I ensure that AGC is disabled?

Many thanks,

Michael Graves

[Christoffer Jansson]

On Tue, Jul 12, 2016 at 11:11 PM Michael Graves <mr.micha...@gmail.com> wrote:

Hello All,

We have a WebRTC-based audio application that requires that AEC be disabled. The AEC mangles outbound audio while in double-talk. So we force our users to wear a headset and turn off AEC. 

I'm given to understand that when AEC is disabled AGC is also disabled. See the comments here as evidence of this. 

However, what I experience is that the microphone gain is still being adjusted by the browser! It almost always goes up to 100% eventually.If there's any acoustic leakage from the user's headset the excessive mic level induces echo.

Q1: Is disabling AEC using googEchoCancellation = false; the definitive way to also disable AGC?

No, there is however a global flag for all audio processing called echoCancellation (yes it is a bit confusing) which you can see Patrik is mentioning in the comments in the article you linked.

Q2: If not, how can I ensure that AGC is disabled?

googAutoGainControl = false.

PTAL at https://appr.tc/params.html for info on most supported parameters. 

Many thanks,

Michael Graves

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/Chris