31 lines
790 B
JavaScript
31 lines
790 B
JavaScript
module.exports = captureVideoFrame
|
|
|
|
function captureVideoFrame (video, format) {
|
|
if (typeof video === 'string') {
|
|
video = document.querySelector(video)
|
|
}
|
|
|
|
if (video == null || video.nodeName !== 'VIDEO') {
|
|
throw new Error('First argument must be a <video> element or selector')
|
|
}
|
|
|
|
if (format == null) {
|
|
format = 'png'
|
|
}
|
|
|
|
if (format !== 'png' && format !== 'jpg' && format !== 'webp') {
|
|
throw new Error('Second argument must be one of "png", "jpg", or "webp"')
|
|
}
|
|
|
|
var canvas = document.createElement('canvas')
|
|
canvas.width = video.videoWidth
|
|
canvas.height = video.videoHeight
|
|
|
|
canvas.getContext('2d').drawImage(video, 0, 0)
|
|
|
|
var dataUri = canvas.toDataURL('image/' + format)
|
|
var data = dataUri.split(',')[1]
|
|
|
|
return new Buffer(data, 'base64')
|
|
}
|