[Bug]: Browser: SpeakerAudioDestination.pause() and .mute() do not always pause or mute synthesized audio

[mattflaschen]

What happened?

I am using SpeakerAudioDestination (based on https://github.com/Azure-Samples/cognitive-services-speech-sdk/blob/633b8fd841a98deeb8b22319271487dffd518755/samples/js/browser/public/synthesis.html#L341 ) to pause TTS audio from SpeechSynthesizer (actually, I want to stop it, but I am using this method for now).

If I call SpeakerAudioDestination .pause() early enough in the playback, it stops playing immediately. If I call it later (closer to the end of the playback), it does not pause at all.

I recommending testing this with a fairly long message (at least 4 or 5 paragraphs), and pausing near the end.

OS: Windows 11
Browser: Edge 146.0.3856.84 (64-bit)

Version

1.48.0 (Latest, Default)

What browser/platform are you seeing the problem on?

Microsoft Edge

Relevant log output

[mattflaschen]

As a workaround, I added .mute() (keeping .pause() too). It still does not work reliably.

[mattflaschen]

In case it's relevant, I am disabling the Timeout worker to avoid Content-Security-Policy issues (#989):

speechConfig.setProperty(SpeechSDK.PropertyId.WebWorkerLoadType, 'off');