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[Bug 17697] Limit total volume

From: <bugzilla@jessica.w3.org>
Date: Fri, 17 Aug 2012 08:36:04 +0000
Message-Id: <E1T2I2G-0004KH-VZ@jessica.w3.org>
To: public-audio@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=17697

--- Comment #8 from Philip J <philipj@opera.com> 2012-08-17 08:36:04 UTC ---
(In reply to comment #6)
> (In reply to comment #4)
> > For what it's worth, we have already received bug reports that certain demos
> > (like Jussi's http://niiden.com/orbisyn/ demo) cause deafeningly loud noise in
> > the current shipping versions of Chrome and Safari for the Mac.  The output is
> > so overwhelmingly loud that the system volume controls have no apparent effect.
> 
> This part "system volume controls have no apparent effect" seems like an
> important clue to try to fix this problem.  I'm guessing that what we need to
> do in the AudioDestination is to clip the final output to 0dBFS (a range from
> -1 -> +1).  This is supposed to be the clipping point anyway, so I'm interested
> if this helps fix the problem.  I'm guessing that the rendered audio signal is
> so "hot" that even with drastic gain reductions using the system volume
> control, it won't help...

Does this mean that the current WebKit implementation just passes the signal on
to the OS without clamping to [-1, 1]?

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Received on Friday, 17 August 2012 08:36:40 GMT

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