svelte audio visualizations

simple, zero dependency audio visualizations for svelte, especially useful for visualizing voice input and output.

svelte-audio-visualizations-2.mp4

Installation

copy the lib/visualizations folder into your project.

Usage

There are two ways you can use the visualizations:

1. Using with a WavRecorder, WavStreamPlayer or AudioFilePlayer instance. For this use the components in the lib/visualizations/audio folder ending with AudioVisualizer.

<script lang="ts">
	import { AudioFilePlayer } from '$lib/visualizations/wavtools';
    import CircleBarAudioVisualizer from '$lib/visualizations/audio/CircleBarAudioVisualizer.svelte';

    let audio: AudioFilePlayer | null = null;

    function playMusic() {
		audio = new AudioFilePlayer();
		audio.loadFile('/svelte-audio-visualizations/music.mp3').then(() => audio.play());
    }
</script>

<button on:click={playMusic}>Play music</button>

{#if audio}
    <CircleBarAudioVisualizer {audio} />
{/if}

2. Passing in values yourself. For this use the components in the lib/visualizations/core folder. Ending just in Visualizer.

<script lang="ts">
	import DeformedCircleVisualizer from '$lib/visualizations/core/DeformedCircleVisualizer.svelte';
</script>

<CircleBarVisualizer values={new Float32Array([0, 1, 0, 1, 0, 1])} />

For this a normalized Float32Array is expected, where each value is between 0 and 1. Also note, that the length of the array influences the visualizations (e.g. number of bars in the BarVisualizer). To convert from any length array, to a specific length, you can use the normalizeArray function.

import { normalizeArray } from '$lib/visualizations/core/utils';

const values = new Float32Array([0, 1, 0, 1, 0, 1]);

const normalizedValues = normalizeArray(values, 10);

Credits

originally built for svelte-realtime-api with lots of code adjusted from openai-realtime-console, including the WavRecorder and WavStreamPlayer classes.

License

MIT