[Webkit-unassigned] [Bug 181557] New: getUserMedia => ScriptProcessorNode yields inputBuffer of all zeros

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Jan 11 13:43:25 PST 2018


https://bugs.webkit.org/show_bug.cgi?id=181557

            Bug ID: 181557
           Summary: getUserMedia => ScriptProcessorNode yields inputBuffer
                    of all zeros
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: boris at smus.com

I was trying to get raw audio input signal from the microphone on my computer. I found that connecting getUserMedia to a ScriptProcessorNode works, but that the input buffers that are read by the onprocess callback of the ScriptProcessorNode are all zeros.

Here's how you can test it:

1. Open https://webrtc.github.io/samples/src/content/getusermedia/volume/ in WebKit (I tried in Safari Version 11.0.2 (13604.4.7.1.3) and Safari Technology Preview)
2. Observe the instant, slow and clip volume meters.

Actual: they are all zero.
Expected: they should fluctuate in response to the ambient sound captured by your device's mic.

Same URL works in Chrome.

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