matrix-react-sdk/lib/workers/playback.worker.js

SDK for matrix.org using React

"use strict";

var _arrays = require("../utils/arrays");
var _consts = require("../audio/consts");
/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

const ctx = self;
ctx.addEventListener("message", async event => {
  const {
    seq,
    data
  } = event.data;

  // First, convert negative amplitudes to positive so we don't detect zero as "noisy".
  const noiseWaveform = data.map(v => Math.abs(v));

  // 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.
  const waveform = (0, _arrays.arrayRescale)((0, _arrays.arraySmoothingResample)(noiseWaveform, _consts.PLAYBACK_WAVEFORM_SAMPLES), 0, 1);
  ctx.postMessage({
    seq,
    waveform
  });
});
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