[Webkit-unassigned] [Bug 78854] New: DelayNode has inaccurate delay

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78854

           Summary: DelayNode has inaccurate delay
           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: rtoy at chromium.org
                CC: crogers at google.com


In the delaynode.html layout test, if you change delayTimeSeconds (in resources/delay-testingjs), to 0.53, the test fails.

This is because the javascript code expects the delayed signal to start at frame 23373 (= 0.53 * 44100) but the rendered data actually starts at 23372.  I think this is due to roundoff.  The delay time is an AudioParam, which takes float values.  0.53f * 44100 = 23372.998.  Perhaps rounding the starting time to the nearest sample will fix this issue.

(It should probably be a rule in the tests not to use nice "round" numbers for timing values.)

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