Implement AudioContext suspend()

[raub]

Spec states that there is a way to temporarily suspend rendering. However, in LabSound you can only start it and never stop, APIwise. Actual implementation of the internal AudioDestination has the needed stop() method, but it is hidden from the exported interfaces. Specifically, AudioDestinationNode already has only the startRendering() and no stopRendering(). Is there a problem with letting people call it?

[meshula]

Further note: AudioContext is supposed to emit a statechanged event when starting, stopping, and deleting the context, and there's supposed to be a status method that reports suspended, running, or closed, when the state has changed.

https://webaudio.github.io/web-audio-api/

[meshula]

One possible implementation; will stop at buffer resolution. avaer@221e1e2

[xioxin]

The pause feature reduces battery consumption when idle.
I am integrating LabSound into Flutter and it is important for mobile to save power.
By the way, how to release the AudioContext, I didn't find the "close" method.

[meshula]

Thank you for bumping this issue.

Destructing an AudioContext will release system resources, but does not match the requirements of close. I created a new issue here: #154

For reference, documentation of suspend is here: https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/suspend

and the summary is:

• The suspend() method of the AudioContext Interface suspends the progression of time in the audio context, temporarily halting audio hardware access

[meshula]

As of c720c5e suspend and resume now pause and resume processing. Time stops progressing during suspend, and resumes properly. CPU utilization falls during suspend. Please feel free to reopen if there are any issues.