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@euterpe.js/euterpe

v2.1.0

Published

Fully featured solution for playing music on the web. Support for local library, audio visuals and more!

Downloads

29

Readme

Euterpe

Fully featured AudioContext music player for the web.

Euterpe in production:

Features:

  • "Local" library/database for songs, collections, artists, waveforms, artist links and much more!
  • Queue and history
  • Easy way to create Vector based audio visuals
  • Library automatization based on folder/file structure, preprocessing and encoding media files for all platforms
  • Safe. Provides wrappers for all functions that are either unsafe or don't give a success return. (very Rust inspired, yes.)
  • Frontend library agnostic

How to use:

Simple demo here

Since this package is just a compilation of our smaller modules, you can read individual modules' tutorials on their respective npm page:

You can further check out how to automate database creation from folder structure, auto encode media for all platforms and create waveform svgs for songs here:

This module builds on those, and further adds functions for playing backwards, forwards and managing the queue.

First we create a database with our songs

db.ts

import { DB, Song, Artist, Ref, RefTo, Platforms } from "@euterpe.js/music-library"
export const db = new DB

db.add([
    //The IDs are added incrementally & are 0 based., so first artists ID added is 0, next 1 etc...
    //You can specify the ID manually if you want
    new Artist({
        name: "Machinedrum",
    }),
    new Artist({
        name: "Tanerélle",
    }),
    new Artist({
        name: "Mono/Poly",
    }),
    new Artist({
        name: "IMANU",
        links: [
            [Platforms.Spotify, new URL("https://open.spotify.com/artist/5Y7rFm0tiJTVDzGLMzz0W1?si=DRaZyugTTIqlBHDkMGKVqA&nd=1")]
        ]
    }),
])
db.add([
    new Song({
        //Refrences are constructed as such. This allows to get to the artist from either collection or song
        artists: [new Ref(RefTo.Artists, 2), new Ref(RefTo.Artists, 3), new Ref(RefTo.Artists, 4)],
        duration: 252,
        name: "Star",
        remix_artists: [new Ref(RefTo.Artists, 5)],
        url: new URL("http://" + window.location.host + "/Machinedrum, Tanerelle & Mono Poly - Star (IMANU Remix) final.mp3")
    }),
])

Then we build our Euterpe player and assign the db to it. Then it's just a matter of creating event listeners to the dom and binding them to Euterpes functions.

main.ts

import { db } from "./db";
import { EuterpeBuilder } from "@euterpe.js/euterpe"

let is_seeking = false
const euterpe = new EuterpeBuilder(document.querySelector("#audio")!, db)
    .build()

document.querySelector("#seek")?.addEventListener("mouseup", (e) => {
	try {
		euterpe.try_seek(e.target?.valueAsNumber)
	} catch {
		alert("Failed seeking! " + e)
	}
	is_seeking = false
})

euterpe.on_song_change((_, song_name) => {
	document.querySelector("#text-playing")!.innerHTML = song_name
})

document.querySelector("#previous")?.addEventListener("click", () => {
	euterpe.try_previous_song_looping().catch((e) => alert(e + "Failed to change song"))
})

document.querySelector("#next")?.addEventListener("click", () => {
	euterpe.try_next_song_looping().catch((e) => alert(e + "Failed to change song"))
})

document.querySelector("#mute")?.addEventListener("click", () => {
	euterpe.mute()
})

document.querySelector("#unmute")?.addEventListener("click", () => {
	euterpe.unmute()
})

document.querySelector("#toggle-play")?.addEventListener("click", () => {
	euterpe.try_play_toggle().catch((e) => alert("failed to toggle pause/play!" + e))
})

document.querySelector("#volume")?.addEventListener("input", (e) => {
	euterpe.change_volume(e.target?.valueAsNumber)
})

//disables time updates so the time slider doesn't slip away from user
document.querySelector("#seek")?.addEventListener("mousedown", () => {
	is_seeking = true
})

Then we can set up listeners to Euterpes events to keep the UI up todate as well

main.ts

//...
// Subscriptions to song and AudioContext changes, eg. time, name..
euterpe.on_duration_formatted((time) => {
	document.querySelector("#duration")!.innerHTML = time
	document.querySelector("#seek")!.max = "" + euterpe.current_song_duration
})

euterpe.on_time_tick_formatted((time) => {
	document.querySelector("#current")!.innerHTML = time
})

euterpe.on_time_tick((time) => {
	if (is_seeking) return
	document.querySelector("#seek")!.value = "" + time
	dev_queue_update()
	dev_history_update()
})

euterpe.on_song_change((_, song_name) => {
	document.querySelector("#text-playing")!.innerHTML = song_name
})

//preload after setting all listeners to make sure you capture the song update!
euterpe.try_preload_song(0).catch((e) => console.log(e + " Failed to preload"))

//..
function dev_queue_update() {
	const p = document.querySelector("#queue-info") as HTMLParagraphElement
	const dev_arr = []
	for (const song of euterpe.queue) {
		dev_arr.push(`Name: ${song.name}, ID: ${song.id} |`)
	}
	p.innerHTML = dev_arr.toString()
}

function dev_history_update() {
	const p = document.querySelector("#history-info") as HTMLParagraphElement
	const dev_arr = []
	for (const song of euterpe.played_history) {
		dev_arr.push(`Name: ${song.name}, ID: ${song.id} |`)
	}
	p.innerHTML = dev_arr.toString()
}

and it's done! For vizualizer demo, or how to use the core parts of the Euterpe libraries separately, check out the individual repos readmes.