[Webkit-unassigned] [Bug 180130] New: Repeated stop() throws InvalidStateError on AudioBufferSourceNode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180130

            Bug ID: 180130
           Summary: Repeated stop() throws InvalidStateError on
                    AudioBufferSourceNode
           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 327842

  --> https://bugs.webkit.org/attachment.cgi?id=327842&action=review

Simple test.html demonstrating the bug

Steps to reproduce:

- Initialize and start an AudioBufferSourceNode
- Call stop() on the source node
- Call stop() again on the source node

Expected: the source node stops or does nothing, depending whether the node has ended or not. No exception is expected.

What actually happens: "InvalidStateError: The object is in an invalid state." exception is thrown on the second stop() call.

I researched the standard (https://webaudio.github.io/web-audio-api/#methods-5) and it did not suggest this exception is reasonable. My use case is: given a started source node scheduled to stop in the future (using stop(some future time)) stop right now, instead of at the scheduled future time.

Example:

    const source = context.createBufferSource()
    source.buffer = buffer
    source.connect(context.destination)
    source.start()
    source.stop(context.currentTime + 1)
    source.stop()

Occurs on Safari 11.0.1 (12604.3.5.1.1) and WebKit 225263.

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