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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1438454-audiounitsetparameter
Parameters inUnit The audio unit that you want to set a parameter value for. inID The audio unit parameter identifier. inScope The audio unit scope for the parameter. inElement The audio unit element for the parameter. inValue The value that you want to apply to the parameter. inBufferOffsetInFrames Set this to 0.
How to set the speaker volume per application on MAC?
https://groups.google.com/g/discuss-webrtc/c/r0bxEhrA7dM
I also already have modified audio_device_mac.cc that can monitor and set the volume per app with AudioUnitGetParameter() and AudioUnitSetParameter(), so it is possible and doable for WebRTC as well if there is interest. "
Volume adjustment does not work on iOS · Issue #50 ...
https://github.com/spotify/cocoalibspotify/issues/50
AudioUnitSetParameter(outputAudioUnit, kHALOutputParam_Volume, kAudioUnitScope_Output, 0, (vol * vol * vol), 0); But the outputAudioUnit is a RemoteIO which does not have the kHALOutputParam_Volume parameter in iOS. Another method for adjusting the buffer volume should be used.
CoreAudio AUGraphから音が出ない
https://www.fixes.pub/program/99990.html
Output defaults to zero too! CheckError(AudioUnitSetParameter(mMixer, kMultiChannelMixerParam_Volume, kAudioUnitScope_Output, 0, 1.0, 0), "AudioUnitSetParameter failed"); ドキュメントには、誤って kMultiChannelMixerParam_Volume と書かれているようです デフォルトは1.0です。 Global scope.
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