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March 7, 2023 01:42
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Demo on creating SVG waveforms from an audio file.
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| <!-- | |
| Copyright 2018 Google LLC | |
| Licensed under the Apache License, Version 2.0 (the "License"); | |
| you may not use this file except in compliance with the License. | |
| You may obtain a copy of the License at | |
| https://www.apache.org/licenses/LICENSE-2.0 | |
| Unless required by applicable law or agreed to in writing, software | |
| distributed under the License is distributed on an "AS IS" BASIS, | |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| See the License for the specific language governing permissions and | |
| limitations under the License. | |
| --> | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Audio Visualizer</title> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| #drop { | |
| display: flex; | |
| justify-content: center; | |
| align-items: center; | |
| position: absolute; | |
| top: 0; | |
| width: 100vw; | |
| height: 100vh; | |
| overflow: hidden; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="dummy"></div> | |
| <a id="download" href="#" download="waveform.svg" hidden>Download</a> | |
| <div id="drop" ondrop="dropHandler(event)" ondragover="event.preventDefault()"> | |
| <div>Drag and drop here!</div> | |
| </div> | |
| <script src="https://unpkg.com/wavesurfer.js"></script> | |
| <script src="https://cdn.jsdelivr.net/gh/gliffy/canvas2svg/canvas2svg.js"></script> | |
| <script> | |
| async function dropHandler(event) { | |
| event.preventDefault(); | |
| const items = event.dataTransfer.items; | |
| if (items && items.length >= 1 && items[0].kind === 'file') { | |
| const file = items[0].getAsFile(); | |
| triggerDownload(await audioToSvg(file)); | |
| } | |
| } | |
| function audioToSvg(file) { | |
| return new Promise(resolve => { | |
| const canvas = new C2S('100%', '100%'); | |
| canvas.style = {}; | |
| HTMLCanvasElement.prototype.getContext = () => canvas; | |
| const wavesurfer = WaveSurfer.create({ | |
| container: '#dummy', | |
| maxCanvasWidth: 100000 | |
| }); | |
| wavesurfer.on('ready', () => { | |
| canvas.save(); | |
| requestIdleCallback(() => resolve(canvas.getSerializedSvg(true))); | |
| }); | |
| wavesurfer.loadBlob(file); | |
| }); | |
| } | |
| function triggerDownload(svg) { | |
| const blob = new Blob([svg], {type: "image/svg"}); | |
| const url = URL.createObjectURL(blob); | |
| const download = document.querySelector('#download'); | |
| download.href = url; | |
| download.click(); | |
| URL.revokeObjectURL(url); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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its works but downloaded SVG is different than the actual wavesurfer canvas