startAudioPreview()

in demo-website/src/meeting.js [745:773]

• 29 lines of code
• 5 McCabe index (conditional complexity)

    startAudioPreview() {
        this.setAudioPreviewPercent(0);
        const analyserNode = this.audioVideo.createAnalyserNodeForAudioInput();
        if (!analyserNode) {
            return;
        }
        if (!analyserNode.getFloatTimeDomainData) {
            document.getElementById('audio-preview').parentElement.style.visibility = 'hidden';
            return;
        }
        const data = new Float32Array(analyserNode.fftSize);
        let frameIndex = 0;
        this.analyserNodeCallback = () => {
            if (frameIndex === 0) {
                analyserNode.getFloatTimeDomainData(data);
                const lowest = 0.01;
                let max = lowest;
                for (const f of data) {
                    max = Math.max(max, Math.abs(f));
                }
                let normalized = (Math.log(lowest) - Math.log(max)) / Math.log(lowest);
                let percent = Math.min(Math.max(normalized * 100, 0), 100);
                this.setAudioPreviewPercent(percent);
            }
            frameIndex = (frameIndex + 1) % 2;
            requestAnimationFrame(this.analyserNodeCallback);
        };
        requestAnimationFrame(this.analyserNodeCallback);
    }