Add music player

package.json

@@ -34,9 +34,12 @@
     "webpack-merge": "^4.1.2"
   },
   "dependencies": {
+    "@fortawesome/fontawesome": "^1.1.8",
+    "@fortawesome/fontawesome-free-webfonts": "^1.0.9",
     "bootstrap": "^4.0.0",
     "jquery": "^3.3.1",
-    "popper.js": "^1.14.1"
+    "popper.js": "^1.14.1",
+    "three": "^0.93.0"
   },
   "scripts": {
     "dev": "webpack --config webpack.config.js",

src/lib/scss/main.scss

@@ -1,3 +1,5 @@
 @import 'custom-bootstrap';
 @import 'fonts';
 @import 'headings';
+
+$fa-font-path: "~@fortawesome/fontawesome-free-webfonts/webfonts";

src/music/music.js

@@ -1,7 +1,7 @@
 import "bootstrap";
 import "./music.scss";
-import music from "./Mseq_-_Journey.mp3";
 
+import music from "./Mseq_-_Journey.mp3";
 import Player from "./player/index.js";
 
 window.player = new Player(music);

src/music/music.pug

@@ -1,4 +1,10 @@
 extends ../lib/pug/base
 
-block content
-  #playerUI
+block footer
+  #playerUI.container-fluid
+    .row
+      #playerContent.container-fluid
+      #playerControls.container-fluid.fixed-bottom
+        .row
+          span#playerButton.col-1.playerControlsContent.fa.fa-fw.fa-spin.fa-spinner
+          #playerText.col-11.playerControlsContent Some text for now

src/music/music.scss

@@ -1,7 +1,30 @@
 @import "../lib/scss/main";
+@import "~@fortawesome/fontawesome-free-webfonts/scss/fontawesome.scss";
+@import "~@fortawesome/fontawesome-free-webfonts/scss/fa-solid.scss";
 @import "~bootstrap/scss/bootstrap";
 
 #playerUI {
   width: 100%;
   height: 100%;
 }
+
+#playerContent {
+  width: 100%;
+  height: 100%;
+}
+
+#playerControls {
+  background-color: $dark;
+  max-width: 100%;
+  padding: 0.5rem 1rem;
+}
+
+.playerControlsContent {
+  padding: 0.5rem 1rem;
+}
+
+#playerButton {
+  text-align: center;
+  vertical-align: middle;
+  line-height: 24px;
+}

src/music/player/audio_manager.js

@@ -0,0 +1,55 @@
+/**
+ * AudioManager()
+ *
+ * A class to manage the audio stream.
+ *
+ * @param {string} src - The URL of the audio to play.
+ */
+class AudioManager {
+    constructor(src) {
+        this._muted = false;
+
+        // Create audio graph
+        this._context = new AudioContext();
+        this.audio = new Audio(src);
+        this._volume = this._context.createGain();
+        this._source = this._context.createMediaElementSource(this.audio);
+
+        let context = this._context;
+        let volume = this._volume;
+        let source = this._source;
+
+        source.connect(volume);
+        volume.connect(context.destination);
+    }
+
+    get context() {
+        return this._context;
+    }
+
+    get source() {
+        return this._source;
+    }
+
+    get muted() {
+        return this._muted;
+    }
+
+    addEventListener(...args) {
+        this.audio.addEventListener(...args);
+    }
+
+    mute() {
+        let context = this._context;
+        let volume = this._volume;
+
+        if (this._muted)
+            volume.gain.setValueAtTime(1, context.currentTime);
+        else
+            volume.gain.setValueAtTime(0, context.currentTime);
+
+        this._muted = !this._muted;
+    }
+}
+
+export default AudioManager;

src/music/player/background.js

@@ -0,0 +1,16 @@
+class Background {
+    constructor(display, audioManager) {
+        if (this.constructor === Background)
+            throw new Error("Cannot instantiate abstract class!");
+    }
+
+    start() {
+
+    }
+
+    stop() {
+
+    }
+}
+
+export default Background;

src/music/player/backgrounds/Spectrum.js

@@ -0,0 +1,99 @@
+import * as three from "three";
+
+import Background from "../background";
+
+class Spectrum extends Background {
+    constructor(display, audioManager) {
+        super(audioManager, display);
+
+        this._audioManager = audioManager;
+        this._display = display;
+
+        this._init_analyser();
+        this._init_scene();
+        this._init_objects();
+    }
+
+    _init_analyser() {
+        let audioManager = this._audioManager;
+
+        let analyser = audioManager.context.createAnalyser();
+        analyser.fftSize = 2048;
+        analyser.smoothingTimeConstant = .8;
+
+        let analyser_data = new Float32Array(analyser.frequencyBinCount);
+
+        audioManager.source.connect(analyser);
+        analyser.getFloatFrequencyData(analyser_data);
+
+        this._analyser = analyser;
+        this._analyser_data = analyser_data;
+    }
+
+    _init_scene() {
+        let scene = new three.Scene();
+
+        let camera = new three.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.01, 10);
+        camera.position.z = 1;
+        scene.add(camera);
+
+        let renderer = new three.WebGLRenderer({antialias: true});
+        renderer.setSize(window.innerWidth, window.innerHeight);
+
+        this._display.append(renderer.domElement);
+
+        this._scene = scene;
+        this._camera = camera;
+        this._renderer = renderer;
+    }
+
+    _init_objects() {
+        let analyser = this._analyser;
+        let scene = this._scene;
+
+        let boxes = Array(analyser.frequencyBinCount);
+        let width = 2 / analyser.frequencyBinCount;
+
+        for (let freq = 0; freq < analyser.frequencyBinCount; freq++) {
+            let geometry = new three.BoxGeometry(1, 1, 1);
+            let material = new three.MeshBasicMaterial({color: 0x99d1ce});
+            let cube = new three.Mesh(geometry, material);
+
+            cube.scale.set(width, 1e-6, width);
+            cube.position.set(-1 + freq * width, 0, 0);
+
+            scene.add(cube);
+            boxes[freq] = cube;
+        }
+
+        this._boxes = boxes;
+    }
+
+    start() {
+        requestAnimationFrame(this._render.bind(this));
+    }
+
+    _render() {
+        let analyser = this._analyser;
+        let camera = this._camera;
+        let renderer = this._renderer;
+        let scene = this._scene;
+
+        for (let freq = 0; freq < analyser.frequencyBinCount; freq++) {
+            let height = analyser.maxDecibels / this._analyser_data[freq];
+
+            if (height > .3)
+                height -= .3;
+            else
+                height = 1e-6;
+
+            this._boxes[freq].scale.y = height;
+        }
+
+        renderer.render(scene, camera);
+        analyser.getFloatFrequencyData(this._analyser_data);
+        requestAnimationFrame(this._render.bind(this));
+    }
+}
+
+export default Spectrum;

src/music/player/controls.js

@@ -0,0 +1,191 @@
+/**
+ * _Text()
+ *
+ * A helper class to control the text area for audio controls.
+ *
+ * @private
+ * @param {HTMLElement} div - The div of the text area.
+ */
+class _Text {
+    constructor (div) {
+        this._element = div;
+
+        this._text = "";
+        this._flashing = false;
+
+        this._flash_timeout = null;
+    }
+
+    flashText(text) {
+        let element = this._element;
+        let flash_timeout = this._flash_timeout;
+
+        element.html(text);
+        this._flashing = true;
+
+        clearTimeout(flash_timeout);
+        this._flash_timeout = setTimeout(() => {
+            this._flashing = false;
+        }, 1000);
+    }
+
+    setText(text) {
+        let element = this._element;
+        let flashing = this._flashing;
+
+        if (!flashing)
+            element.html(text);
+
+        this._text = text;
+    }
+}
+
+/**
+ * _Button()
+ *
+ * A helper class to control the indicator button for audio controls.
+ *
+ * @private
+ * @param {HTMLElement} button - The div of the button.
+ */
+class _Button {
+    constructor(button) {
+        this._element = button;
+
+        this._classes = "";
+        this._flash_classes = "";
+        this._flashing = false;
+
+        this._flash_timeout = null;
+    }
+
+    click (callback) {
+        this._element.click(callback);
+    }
+
+    flashIcon(icon) {
+        let classes = this._classes;
+        let element = this._element;
+        let flash_classes = this._flash_classes;
+        let flash_timeout = this._flash_timeout;
+
+        // We remove any potentially current classes, and add the
+        // requested icon class.
+        element.removeClass(flash_classes);
+        element.removeClass(classes);
+        element.addClass(icon);
+
+        // We keep track of the classes we are flashing and the fact
+        // that we are flashing, so that we can remove the correct
+        // classes later.
+        this._flash_classes = icon;
+        this._flashing = true;
+
+        // If we previously started a timeout, we'll want to cancel it
+        // now, since otherwise *it* will clear out our classes.
+        clearTimeout(flash_timeout);
+
+        // We start a timeout to reset to the original classes.
+        this._flash_timeout = setTimeout(() => {
+            element.removeClass(this._flash_classes);
+            element.addClass(this._classes);
+
+            this._flash_classes = "";
+            this._flashing = false;
+        }, 1000);
+    }
+
+    setIcon(icon) {
+        let classes = this._classes;
+        let element = this._element;
+        let flashing = this._flashing;
+
+        // If we are currently flashing an icon, we'll hold off on
+        // changing the icon.
+        if (!flashing) {
+            element.removeClass(classes);
+            element.addClass(icon);
+        }
+
+        this._classes = icon;
+    }
+}
+
+/**
+ * Controls()
+ *
+ * A class to manage music player controls.
+ *
+ * @param {AudioManager} audioManager - The audio manager to interact with.
+ */
+class Controls {
+    constructor(audioManager) {
+        this._element = $("#playerControls");
+        this._button = new _Button($("#playerControls #playerButton"));
+        this._text = new _Text($("#playerControls #playerText"));
+        this._audioManager = audioManager;
+
+        this._setAudioEvents({
+            canplay: () => this._audioManager.audio.play(),
+            error: () => this.setError(this._audioManager.audio.error.message),
+            loadstart: () => this.setLoading(),
+            playing: () => this.setPlaying(),
+            stalled: () => this.setLoading("Stalling")
+        });
+
+        this._button.click(() => this.mute());
+    }
+
+    setPlaying() {
+        let button = this._button;
+        let text = this._text;
+
+        button.setIcon("fa-play");
+        text.setText("");
+    }
+
+    setLoading(reason="Loading") {
+        let button = this._button;
+        let text = this._text;
+
+        button.setIcon("fa-spin fa-spinner");
+        text.setText(reason);
+    }
+
+    setError(reason="") {
+        let button = this._button;
+        let text = this._text;
+
+        if (reason == "")
+            reason = "Error";
+        else
+            reason = `Error: ${reason}`;
+
+        button.setIcon("fa-stop-circle");
+        text.setText(reason);
+    }
+
+    mute() {
+        let audioManager = this._audioManager;
+        let button = this._button;
+        let text = this._text;
+
+        audioManager.mute();
+
+        if (audioManager.muted) {
+            button.flashIcon("fa-volume-off");
+            text.flashText("Muted");
+        } else {
+            button.flashIcon("fa-volume-up");
+            text.flashText("Unmuted");
+        }
+    }
+
+    _setAudioEvents(events) {
+        for (let [event, handler] of Object.entries(events)) {
+            this._audioManager.addEventListener(event, handler);
+        }
+    }
+}
+
+export default Controls;

src/music/player/display.js

@@ -0,0 +1,21 @@
+import Spectrum from "./backgrounds/Spectrum.js";
+
+let backgrounds = {
+    "Spectrum": Spectrum
+};
+
+class Display {
+    constructor(audioManager) {
+        this._audioManager = audioManager;
+        this._element = $("#playerContent");
+
+        this._background = new backgrounds["Spectrum"](this._element, audioManager);
+        this._background.start();
+    }
+
+    set background(name) {
+
+    }
+}
+
+export default Display;

src/music/player/index.js

@@ -1,28 +1,13 @@
-class AudioManager {
-    constructor(src) {
-        this._context = new AudioContext();
-        this.audio = new Audio(src);
-
-        let audio = this.audio;
-        let context = this._context;
-
-        // Create audio graph
-        let volume = context.createGain();
-        let source = context.createMediaElementSource(audio);
-
-        source.connect(volume);
-        volume.connect(context.destination);
-    }
-}
+import AudioManager from "./audio_manager";
+import Controls from "./controls";
+import Display from "./display";
 
 class Player {
     constructor(src="https://tlater.net/assets/Mseq_-_Journey.mp3") {
         this._ui = $("#playerUI");
         this._audioManager = new AudioManager(src);
-
-        let audioManager = this._audioManager;
-
-        audioManager.oncanplay = () => audioManager.audio.play();
+        this._controls = new Controls(this._audioManager);
+        this._display = new Display(this._audioManager);
     }
 }