@corti/dictation-web/dist/audioService.js

Web component for Corti Dictation

export class AudioService {
    constructor(mediaStream) {
        this.audioContext = new AudioContext();
        const source = this.audioContext.createMediaStreamSource(mediaStream);
        this.analyser = this.audioContext.createAnalyser();
        this.analyser.fftSize = 8192;
        source.connect(this.analyser);
    }
    getAudioLevel() {
        const bufferLength = this.analyser.fftSize;
        const dataArray = new Uint8Array(bufferLength);
        this.analyser.getByteTimeDomainData(dataArray);
        let sum = 0;
        for (let i = 0; i < bufferLength; i += 1) {
            const normalized = (dataArray[i] - 128) / 128;
            sum += normalized * normalized;
        }
        return Math.sqrt(sum / bufferLength);
    }
}
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