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soundmeter.js
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soundmeter.js
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'use strict';
import "./external/loglevel.min.js";
const Logger = window.log;
export class SoundMeter {
/**
*
* @param {AudioContext} context
*/
constructor(context, volumeMeterUrl) {
this.context = context;
this.instant = 0.0;
this.mic = null;
this.volumeMeterNode = null;
this.url = volumeMeterUrl;
}
/**
*
* @param {MediaStream} stream
* @param {Function} levelCallback
* @param {Function} errorCallback
* @returns
*/
connectToSource(stream, levelCallback, errorCallback) {
return this.context.audioWorklet.addModule(this.url).then(()=> {
this.mic = this.context.createMediaStreamSource(stream);
this.volumeMeterNode = new AudioWorkletNode(this.context, 'volume-meter');
this.volumeMeterNode.port.onmessage = (event) => {
if (event.data.type == 'debug') {
Logger.debug(event.data.message);
}
else {
this.instant = event.data;
levelCallback(this.instant.toFixed(2));
Logger.debug("Audio level: " + this.instant.toFixed(2));
}
};
this.mic.connect(this.volumeMeterNode);
})
.catch((err) => {
if (errorCallback !== undefined) {
errorCallback(err);
}
Logger.error("Error in soundmeter: " + err);
Logger.error("You may need to define the url of the volume-meter-processor.js");
throw err;
});
}
stop() {
if (this.volumeMeterNode != null) {
this.volumeMeterNode.port.postMessage('stop');
this.volumeMeterNode.disconnect();
this.volumeMeterNode.port.close();
this.volumeMeterNode = null;
}
if (this.mic != null) {
this.mic.disconnect();
this.mic = null;
}
}
}