How can I set transmit-side volume scale on iOS?

[Ray Wang]

Hi,

Since AGC is disabled by default on iOS,  and Microphone & Speaker volume cannot be set on iOS.

There is one way to set output volume scale with VoEVolumeControlImpl::SetChannelOutputVolumeScaling, 

However I couldn't find any way to set transmit side volume scale, please tell me how to do this if anyone knows. Thanks.

[Lars Bork]

Hey Ray,

have you been able to find a way to set the volume for a specific audio track / channel?

I've also seen low-level C++ api which provides things like "SetChannelOutputVolumeScaling", but I am not sure how this could work together with the high-level Objective-C architecture.

I'd really appreciate any suggestions or hints!

Thanks a lot and have a nice day!

[Wangrui]

NO, I didn't find a way to do that. I guess you have to modify the low level C++ code if you really need that.

Sent from my iPhone

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[Alvaro Gil]

Ray, did you try something like this ?

AVAudioSession *audioSession = AVAudioSession.sharedInstance;

if (audioSession.isInputGainSettable) {
    [audioSession setInputGain:0.5 error:&gainError];
} else {
    NSLog(@"Device is not input gain settable!");
}

if (gainError) {

    NSLog(@"Error: %@", gainError);

}

BTW I am looking for access to AudioUnit being used by WebRTC, if anyone has a tip for it please share.

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Alvaro

[Henrik Andreasson]

Just FYI, AGC is not disabled on iOS (as was stated earlier in this thread).

The software based AGC version in WebRTC is disabled but instead the native AGC provided by the audio unit in iOS is utilized.

We also use a separate level controller (LC) on top of the built-in AGC. I am unable to see any use of additional gain APIs on the

shared audio session. The LC + AGC should be sufficient.

To view this discussion on the web visit https://groups.google.com/d/msgid/discuss-webrtc/CAGM%2B_3bZSoO2QYFZW8nXZh0JC5rLwiHzmU%3DJFbz%2B6X6AvPnRcw%40mail.gmail.com.

[Fredrik Solenberg]

See this thread for more discussion on setting levels on incoming/outgoing streams: https://groups.google.com/d/msg/discuss-webrtc/6W5wJ76AugI/hqLVTqhsCwAJ

On Friday, November 25, 2016 at 1:35:07 PM UTC+1, Henrik Andreassson wrote:

Just FYI, AGC is not disabled on iOS (as was stated earlier in this thread).

The software based AGC version in WebRTC is disabled but instead the native AGC provided by the audio unit in iOS is utilized.

We also use a separate level controller (LC) on top of the built-in AGC. I am unable to see any use of additional gain APIs on the

shared audio session. The LC + AGC should be sufficient.

On Fri, Nov 25, 2016 at 1:24 PM, Alvaro Gil <zeva...@gmail.com> wrote:

Ray, did you try something like this ?

AVAudioSession *audioSession = AVAudioSession.sharedInstance;

if (audioSession.isInputGainSettable) {
    [audioSession setInputGain:0.5 error:&gainError];
} else {
    NSLog(@"Device is not input gain settable!");
}

if (gainError) {

    NSLog(@"Error: %@", gainError);

}

BTW I am looking for access to AudioUnit being used by WebRTC, if anyone has a tip for it please share.

2016-08-11 3:12 GMT-03:00 Ray Wang <wangr...@gmail.com>:

Hi,

Since AGC is disabled by default on iOS,  and Microphone & Speaker volume cannot be set on iOS.

There is one way to set output volume scale with VoEVolumeControlImpl::SetChannelOutputVolumeScaling, 

However I couldn't find any way to set transmit side volume scale, please tell me how to do this if anyone knows. Thanks.

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Alvaro

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