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| /** | |
| * Copyright 2024 Google LLC | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); | |
| * you may not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ | |
| const VolMeterWorket = ` | |
| class VolMeter extends AudioWorkletProcessor { | |
| volume | |
| updateIntervalInMS | |
| nextUpdateFrame | |
| constructor() { | |
| super() | |
| this.volume = 0 | |
| this.updateIntervalInMS = 25 | |
| this.nextUpdateFrame = this.updateIntervalInMS | |
| this.port.onmessage = event => { | |
| if (event.data.updateIntervalInMS) { | |
| this.updateIntervalInMS = event.data.updateIntervalInMS | |
| } | |
| } | |
| } | |
| get intervalInFrames() { | |
| return (this.updateIntervalInMS / 1000) * sampleRate | |
| } | |
| process(inputs) { | |
| const input = inputs[0] | |
| if (input.length > 0) { | |
| const samples = input[0] | |
| let sum = 0 | |
| let rms = 0 | |
| for (let i = 0; i < samples.length; ++i) { | |
| sum += samples[i] * samples[i] | |
| } | |
| rms = Math.sqrt(sum / samples.length) | |
| this.volume = Math.max(rms, this.volume * 0.7) | |
| this.nextUpdateFrame -= samples.length | |
| if (this.nextUpdateFrame < 0) { | |
| this.nextUpdateFrame += this.intervalInFrames | |
| this.port.postMessage({volume: this.volume}) | |
| } | |
| } | |
| return true | |
| } | |
| }`; | |
| export default VolMeterWorket; | |