[Webkit-unassigned] [Bug 76400] New: Convolution has glitching in mac port on Lion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=76400

           Summary: Convolution has glitching in mac port on Lion
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: crogers at google.com
                CC: crogers at google.com


Steps to reproduce:

1. Run WebKit nightly in Lion and visit:
http://chromium.googlecode.com/svn/trunk/samples/audio/convolution-effects.html

2. Try some of the different effects and listen for occasional glitches (may take a little while to hear)

This appears to be a regression which is happening on Lion, but *not* when I run on Snow Leopard.  So, maybe related to sand-boxing?

There are one or more worker threads created in ReverbConvolver.cpp:
http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/audio/ReverbConvolver.cpp

Currently the thread priority is not being boosted, and under normal conditions has worked fine for quite some time in mac port and chromium/mac.
Technically, it would probably be better to boost the priority to an intermediate higher priority (but not as high as the real-time audio thread).

Perhaps the sandboxing is harming the thread priorities - just a guess...  System trace in Shark (or whatever the latest profiling tool is) may be of help here as well

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