[opensource-dev] Review Request: STORM-830 Volume slider isn't properly remembered if set to zero

[Aleric Inglewood]

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This is really not how you want to deal with this bug :/.  It's a known fact that audio mixers are very bad with low volumes. Setting a volume to 0 (or something really small) can put a very high load on the CPU for the audio mixer, which causes severe problems. See https://jira.secondlife.com/browse/VWR-14914

So, on the contrary (as VWR-14914 fixed a horrible bug that made FPS drop drastically): when the volume is set to 0 (or even close to zero) the audio channel has to be muted and not mixed, ever. Assuming that VWR-14914 is in Viewer 2, and wasn't broken in the meantime, a volume of 0 would cause the channel to be muted, but setting it to 0.000001 will not cause it to be muted, but result in a high CPU load.


- Aleric


On Jan. 6, 2011, 2:37 p.m., Jonathan Yap wrote:
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> (Updated Jan. 6, 2011, 2:37 p.m.)
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> Review request for Viewer.
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> Summary
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> There is an edge case in setMasterGain during startup which prevents setInternalGain from being called if the master volume setting and mInternalGain both equal 0.
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> Setting mInternalGain to a very low but non-zero value fixes this issue.
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> This addresses bug STORM-830.
>     http://jira.secondlife.com/browse/STORM-830
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> Diffs
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>   indra/llaudio/llaudioengine.cpp 6d44f0d85a80 
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> Diff: http://codereview.secondlife.com/r/72/diff
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> Testing
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> In Preferences / Sound & Media tested:
> Buttons
> Ambient
> Sound Effects
> Stream Music
> Media
> Voice Chat
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> 
> Thanks,
> 
> Jonathan
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>

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