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Remove unnecessary rescaling of voice waveforms

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Fixes https://github.com/vector-im/element-web/issues/18364
This commit is contained in:
Travis Ralston 2021-08-03 13:51:11 -06:00
parent 24da0291a0
commit 1b9fe46733
2 changed files with 5 additions and 18 deletions
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14
src/audio/Playback.ts
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@ -38,17 +38,9 @@ function makePlaybackWaveform(input: number[]): number[] {
// First, convert negative amplitudes to positive so we don't detect zero as "noisy".
const noiseWaveform = input.map(v => Math.abs(v));
// Next, we'll resample the waveform using a smoothing approach so we can keep the same rough shape.
// We also rescale the waveform to be 0-1 for the remaining function logic.
const resampled = arrayRescale(arraySmoothingResample(noiseWaveform, PLAYBACK_WAVEFORM_SAMPLES), 0, 1);
// Then, we'll do a high and low pass filter to isolate actual speaking volumes within the rescaled
// waveform. Most speech happens below the 0.5 mark.
const filtered = resampled.map(v => clamp(v, 0.1, 0.5));
// Finally, we'll rescale the filtered waveform (0.1-0.5 becomes 0-1 again) so the user sees something
// sensible. This is what we return to keep our contract of "values between zero and one".
return arrayRescale(filtered, 0, 1);
// Then, we'll resample the waveform using a smoothing approach so we can keep the same rough shape.
// We also rescale the waveform to be 0-1 so we end up with a clamped waveform to rely upon.
return arrayRescale(arraySmoothingResample(noiseWaveform, PLAYBACK_WAVEFORM_SAMPLES), 0, 1);
}
export class Playback extends EventEmitter implements IDestroyable {