Bug 180388 – Starting a looped AudioBufferSourceNode with offset > duration throws InvalidStateError

• Component: Web Audio
• Status: NEW

[Márton Salomváry]

Created attachment 328418 [details]
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