Function computeAudioLevel

computeAudioLevel(audioStreamBuffer): AudioLevel
Computes RMS and peak audio levels from an AudioStreamBuffer, for rendering a microphone (or system-audio) level meter.

Electron has no dedicated microphone-preview component; the supported way to render a live level meter is to use a microphone/system-audio stream output and call this helper in your streamCallback.
Parameters
- audioStreamBuffer: AudioStreamBuffer
Returns AudioLevel
Example
```
import { computeAudioLevel } from '@nonstrict/recordkit';

const streamCallback = (audioBuffer) => {
  const { peakDb } = computeAudioLevel(audioBuffer);
  meterElement.style.height = `${Math.max(0, 100 + peakDb)}%`; // -100 dB..0 dB -> 0%..100%
};
```

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