> On Jan. 6, 2011, 5:37 p.m., Aleric Inglewood wrote: > > 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 Inglewood wrote: > After discussion on IRC Jonathan explained to me what this is all about. > The patch is correct. > Nevertheless, I was confused about the fact that this value of 0.000001 > is never going to be USED. > Perhaps a different value and comment can avoid that in the future when > other coders look at it. > mInternalGain is only ever compared with, and the whole point of this > patch is to make sure > that the first comparison fails (I now understand). A common value used > to make sure that > a first comparison fails is a value outside the valid range of that > variable. The valid > range being [0, 1], I'd suggest using -1 and adding a comment in the > lines of: > > // Make sure that the first call to setMasterGain will cause > setInternalGain to be called. > mInternalGain = -1.f; > > > Kent Quirk wrote: > Aleric is correct, and if the approach is technically possible it would > be preferred to use an out-of-range value. It appears to me that his > suggested fix will work, but I haven't tried it myself. Jonathan, can you try > it, please? >
I changed the initial value of mInternalGain to -1, did a quick test with key clicks, and saw that that fixes the problem, too. - Jonathan ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: http://codereview.secondlife.com/r/72/#review128 ----------------------------------------------------------- On Jan. 6, 2011, 2:37 p.m., Jonathan Yap wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > http://codereview.secondlife.com/r/72/ > ----------------------------------------------------------- > > (Updated Jan. 6, 2011, 2:37 p.m.) > > > Review request for Viewer. > > > Summary > ------- > > 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. > > Setting mInternalGain to a very low but non-zero value fixes this issue. > > > This addresses bug STORM-830. > http://jira.secondlife.com/browse/STORM-830 > > > Diffs > ----- > > indra/llaudio/llaudioengine.cpp 6d44f0d85a80 > > Diff: http://codereview.secondlife.com/r/72/diff > > > Testing > ------- > > In Preferences / Sound & Media tested: > Buttons > Ambient > Sound Effects > Stream Music > Media > Voice Chat > > > Thanks, > > Jonathan > >
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