[Webkit-unassigned] [Bug 199876] New: [GTK] webaudio tests fail despite seemingly producing the exact expected results

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199876

            Bug ID: 199876
           Summary: [GTK] webaudio tests fail despite seemingly producing
                    the exact expected results
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

The following tests are failing on GTK since around r246107

webaudio/oscillator-custom.html
webaudio/oscillator-sawtooth.html
webaudio/oscillator-sine.html
webaudio/oscillator-square.html
webaudio/oscillator-triangle.html

Interestingly though, these are audio tests (instead of text tests or image tests), and the test tool claims a huge mismatch:

https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r247512%20(10978)/results.html

Sample #3622
< 9503
---
> 9504
Sample #7829
< 8243
---
> 8242
Sample #9686
< -6077
---
> -6076
Sample #11126
< -5946
---
> -5947
Sample #13515
< -62
---
> -63
Sample #15674
< 7894
[...]

But after taking both the actual and expected files, adding them to different tracks on Audacity, inverting one and playing the result, I couldn't hear anything. They look equal, sound equal, and the histogram shows them as pretty equal too.

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