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annotate web/light9-timeline-audio.ts @ 2447:361c612e3c60

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author drewp@bigasterisk.com
date Mon, 03 Jun 2024 12:11:54 -0700
parents e7e03c203c99
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import { debug } from "debug";
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2 import { html, LitElement, PropertyValues } from "lit";
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3 import { customElement, property, state } from "lit/decorators.js";
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4 import { NamedNode } from "n3";
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5 import { getTopGraph } from "./RdfdbSyncedGraph";
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6 import { SyncedGraph } from "./SyncedGraph";
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7
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8 const log = debug("audio");
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9
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10 export interface Zoom {
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11 duration: number | null;
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12 t1: number;
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13 t2: number;
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14 }
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15
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16 function nodeHasChanged(newVal?: NamedNode, oldVal?: NamedNode): boolean {
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17 if (newVal === undefined && oldVal === undefined) {
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18 return false;
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19 }
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20 if (newVal === undefined || oldVal === undefined) {
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21 return true;
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22 }
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23 return !newVal.equals(oldVal);
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24 }
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25
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26 // (potentially-zoomed) spectrogram view
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27 @customElement("light9-timeline-audio")
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28 export class Light9TimelineAudio extends LitElement {
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29 graph!: SyncedGraph;
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30 graphReady: Promise<void>;
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31 render() {
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32 return html`
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33 <style>
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34 :host {
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35 display: block;
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36 /* shouldn't be seen, but black is correct for 'no
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37 audio'. Maybe loading stripes would be better */
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38 background: #202322;
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39 outline: 1px solid #333;
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40 }
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41 div {
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42 width: 100%;
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43 height: 100%;
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44 overflow: hidden;
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45 }
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46 img {
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47 height: 100%;
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48 position: relative;
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49 transition: left 0.1s linear;
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50 }
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51 </style>
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52 <div>
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53 <img src=${this.imgSrc} style="width: ${this.imgWidth}; left: ${this.imgLeft}" />
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54 </div>
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55 `;
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56 }
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57 @property({ hasChanged: nodeHasChanged }) show!: NamedNode;
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58 @property({ hasChanged: nodeHasChanged }) song!: NamedNode;
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59 @property() zoom: Zoom = { duration: null, t1: 0, t2: 1 };
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60 @state() imgSrc: string = "#";
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61 @state() imgWidth: string = "0"; // css
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62 @state() imgLeft: string = "0"; // css
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63
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64 constructor() {
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65 super();
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66
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67 this.graphReady = getTopGraph().then((g) => {
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68 this.graph = g;
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69 });
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70 }
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71
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72 async updated(changedProperties: PropertyValues) {
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73 super.updated(changedProperties);
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74 if (changedProperties.has("song") || changedProperties.has("show")) {
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75 await this.graphReady;
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76 if (this.song && this.show) {
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77 this.graph.runHandler(this.setImgSrc.bind(this), "timeline-audio " + this.song.value);
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78 }
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79 }
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80 if (changedProperties.has("zoom")) {
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81 this.imgWidth = this._imgWidth(this.zoom);
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82 this.imgLeft = this._imgLeft(this.zoom);
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83 }
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84 }
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85
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86 setImgSrc() {
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87 try {
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88 var root = this.graph.stringValue(this.show, this.graph.Uri(":spectrogramUrlRoot"));
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89 } catch (e) {
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90 return;
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91 }
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92
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93 try {
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94 var filename = this.graph.stringValue(this.song, this.graph.Uri(":songFilename"));
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95 } catch (e) {
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96 return;
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97 }
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98
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99 this.imgSrc = root + "/" + filename.replace(".wav", ".png").replace(".ogg", ".png");
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100 log(`imgSrc ${this.imgSrc}`);
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101 }
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102
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103 _imgWidth(zoom: Zoom): string {
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104 if (!zoom.duration) {
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105 return "100%";
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106 }
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107
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108 return 100 / ((zoom.t2 - zoom.t1) / zoom.duration) + "%";
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109 }
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110 _imgLeft(zoom: Zoom): string {
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111 if (!zoom.duration) {
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112 return "0";
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113 }
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114
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115 var percentPerSec = 100 / (zoom.t2 - zoom.t1);
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116 return -percentPerSec * zoom.t1 + "%";
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117 }
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118 }