[Webkit-unassigned] [Bug 184646] New: Aliasing with Web Audio API / getUserMedia

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184646

            Bug ID: 184646
           Summary: Aliasing with Web Audio API / getUserMedia
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joe at chirp.io

analyser: https://analyser.chirp.io
generator: http://onlinetonegenerator.com/

Steps to Reproduce
------------------

1. Visit https://analyser.chirp.io or equivalent Web Audio API analyser in Safari 11.
2. Play a tone around 11kHz, and 12kHz 
3. You will see the mirrored effects of aliasing.

Actual Results
--------------

Frequencies above 11kHz are mirrored and cannot be used.

Expected Results
----------------

The sample rate used by the FFT should match that output by the audioContext.sampleRate.

Build Date & Hardware
---------------------

macOS 10.13.3 and 10.13.4
Safari 11.0.2 and 11.1

Additional Builds and Platforms
-------------------------------

iOS 11.3

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