canvas渲染video视频，并添加图像设置功能，
source link: http://www.hywel.cn/2020/10/16/canvas%E6%B8%B2%E6%9F%93video%E8%A7%86%E9%A2%91%EF%BC%8C%E5%B9%B6%E6%B7%BB%E5%8A%A0%E5%9B%BE%E5%83%8F%E8%AE%BE%E7%BD%AE%E5%8A%9F%E8%83%BD%EF%BC%8C/
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canvas渲染video视频，并添加图像设置功能，
Posted on
2020-10-16 In Web前端
本文主要展示使用canvas来实时的获取video并动态播放的例子。
function drawCanvas() {
if (videoElement.paused videoElement.ended) {
return;
}
var canvas = $(“#canvas”);
var _canvas = canvas.get(0);
context = _canvas.getContext(“2d”);
canvas.attr({
width: videoElement.videoWidth,
height: videoElement.videoHeight
})
context.clearRect(0, 0, videoElement.videoWidth, videoElement.videoHeight);
context.fillStyle = ‘red’;
context.fillStyle = ‘rgba(255,255,0,0.5)’;
context.drawImage(videoElement, 0, 0, videoElement.videoWidth, videoElement.videoHeight, 0, 0, videoElement.videoWidth, videoElement.videoHeight);
if (videoElement.videoWidth > 0 && videoElement.videoHeight > 0) {
var filters = “blur(“ + (_blur.getCurVal() / 10) + “px) brightness(“ + (_brightness.getCurVal() / 10) + “) contrast(“ + (_contrast.getCurVal() / 10) + “) grayscale(“ + (_grayscale.getCurVal() / 100) + “) hue-rotate(“ + (_hue_rotate.getCurVal()) + “deg) invert(“ + (_invert.getCurVal() / 100) + “) saturate(“ + (_saturate.getCurVal() / 10) + “) sepia(“ + (_sepia.getCurVal() / 100) + “)”;
$(“#canvas”).css({
‘-webkit-filter’: filters,
‘max-width’: ‘100%’
});
}
setTimeout(drawCanvas, 24);
}
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