[Webkit-unassigned] [Bug 180388] New: Starting a looped AudioBufferSourceNode with offset > duration throws InvalidStateError

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180388

            Bug ID: 180388
           Summary: Starting a looped AudioBufferSourceNode with offset >
                    duration throws InvalidStateError
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: salomvary at gmail.com

Created attachment 328418

  --> https://bugs.webkit.org/attachment.cgi?id=328418&action=review

Simple test.html demonstrating the bug

Given a buffer of 15 seconds start() on the last line in this example throws InvalidStateError: The object is in an invalid state.

    const source = context.createBufferSource()
    source.buffer = buffer
    source.loop = true
    source.connect(context.destination)
    source.start(0, 20)

Note: it does not throw when the offset is less than the length of the buffer. 

Expected: start the looped playback with 5 seconds initial offset. My understanding of the standard and the behavior in Chrome and Firefox suggest that this is a bug. See:
https://webaudio.github.io/web-audio-api/#dom-audiobuffersourcenode-start

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