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| /* | |
| <html> | |
| <style> | |
| ::part(thumbnails) { | |
| display: flex; | |
| flex-wrap: nowrap; | |
| width: 100%; | |
| overflow: hidden; | |
| } | |
| video { | |
| width: 100%; | |
| } | |
| </style> | |
| <div id="thumbnails" part="thumbnails"></div> | |
| <video src="/examples/audio/nasa.mp4" controls /> | |
| </html> | |
| */ | |
| import WaveSurfer from 'https://unpkg.com/wavesurfer.js@7/dist/wavesurfer.esm.js' | |
| const MAX_THUMBS = 5 | |
| const thumbnails = document.querySelector('#thumbnails') | |
| const video = document.querySelector('video') | |
| const canvas = document.createElement('canvas') | |
| const ctx = canvas.getContext('2d') | |
| canvas.width = 600 | |
| canvas.height = 400 | |
| const wavesurfer = WaveSurfer.create({ | |
| container: document.body, | |
| waveColor: 'rgb(200, 0, 200)', | |
| progressColor: 'rgb(100, 0, 100)', | |
| media: video, | |
| }) | |
| wavesurfer.getWrapper().appendChild(thumbnails) | |
| function captureFrame() { | |
| ctx.drawImage(video, 0, 0, canvas.width, canvas.height) | |
| const src = canvas.toDataURL() | |
| const img = document.createElement('img') | |
| img.src = src | |
| return img | |
| } | |
| function onSeeked() { | |
| if (video.currentTime > 0) { | |
| const img = captureFrame() | |
| img.style = `width: ${100 / MAX_THUMBS}%; height: auto; box-sizing: border-box; border: 2px solid #fff;` | |
| thumbnails.appendChild(img) | |
| } | |
| if (video.currentTime < video.duration) { | |
| video.currentTime += Math.floor(video.duration / MAX_THUMBS) | |
| } else { | |
| video.removeEventListener('seeked', onSeeked) | |
| setTimeout(() => video.currentTime = 0, 100) | |
| } | |
| } | |
| video.addEventListener('seeked', onSeeked) | |
| wavesurfer.on('ready', () => { | |
| onSeeked() | |
| }) |
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