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作者:朋也
日期:2021-05-10
类别:javascript学习笔记
版权声明:自由转载-非商用-非衍生-保持署名(创意共享3.0许可证)
有时候看一些网页上的视频音量调到100%,还是听着很小,尝试着用js调用video的api来调调整视频播放器的音量,发现没法超过1.0
随后在sof上找到了一篇文章,可以解决音量上限的问题,备份一下
function amplifyMedia(mediaElem, multiplier) {
var context = new (window.AudioContext || window.webkitAudioContext),
result = {
context: context,
source: context.createMediaElementSource(mediaElem),
gain: context.createGain(),
media: mediaElem,
amplify: function(multiplier) { result.gain.gain.value = multiplier; },
getAmpLevel: function() { return result.gain.gain.value; }
};
result.source.connect(result.gain);
result.gain.connect(context.destination);
result.amplify(multiplier);
return result;
}
调用
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>My Test Video</title>
</head>
<body>
<video id="myVideo" controls src="video.mp4"></video>
<script src="createAmplifier.js"></script>
<script type="text/JavaScript">
// Make my video twice as loud as normal.
createAmplifier(document.getElementById('myVideo'), 2);
</script>
</body>
</html>