[Webkit-unassigned] [Bug 183253] New: Multiple calls to setTargetAtTime with separate timestamps has unpredictable behavior

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183253

            Bug ID: 183253
           Summary: Multiple calls to setTargetAtTime with separate
                    timestamps has unpredictable behavior
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ae at seven.systems

I've spent the last 2 days trying to make a simple ADSR envelope generator using setTargetAtTime. It's hard to isolate a testcase, but I can say that as soon as several targets are added to the timeline, for example: 0 at 1 second, 1 at 2 seconds, 0.5 at 3 seconds, and 0 at 4 seconds), the resulting curves are unpredictable, especially when interrupted with cancelScheduledValues and then re-constructed (both are necessary for making a working real-world ADSR generator). The same code works flawlessly in Chrome and Firefox... I could possibly provide a testcase if needed.

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