Is it possible to run a javascript proxy that proxy the video's media request on the client side?
Question
I have video files hosted on the CDN, the video file is encrypted. So I need the decrypt it before play it in the browser. But the web video tag has no interface to modify the media stream.
So I want to run a proxy in the client side with javascript to proxy the media stream request, and decrypt the stream before feet to the video tag.
Is it possible?
By math-chen's answer , I have tryed below code, but when I paly it, the video keep spin and not render the frame like below image.
I use a very small unencrypted video file out.mp4 , so it can be loaded by once.
<html>
<video id="video" controls src="out.mp4">
</video>
<script>
const video = document.querySelector('#video');
const mediaSource = new MediaSource();
video.src = URL.createObjectURL(mediaSource);
mediaSource.addEventListener('sourceopen', sourceOpen);
function sourceOpen() {
var mime = 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"'
var sourceBuffer = mediaSource.addSourceBuffer(mime);
fetchBuffer('out.mp4', buffer => {
sourceBuffer.appendBuffer(buffer)
})
}
function fetchBuffer (url, callback) {
var xhr = new XMLHttpRequest;
xhr.open('get', url);
xhr.responseType = 'arraybuffer';
xhr.onload = function () {
callback(xhr.response);
};
xhr.send();
}
</script>
</html>
1 answers
solution1
1 2021-12-17 08:25:02
it does not need a proxy
const video = document.querySelector('#video');
const mediaSource = new MediaSource();
video.src = URL.createObjectURL(mediaSource);
mediaSource.addEventListener('sourceopen', sourceOpen);
//you can implement logic in function sourceOpen
function sourceOpen() {
//mime is type of video
const sourceBuffer = mediaSource.addSourceBuffer(mime);
fetch(videoUrl).then(function(response) {
//decrypt
return response.arrayBuffer();
}).then(buffer => {
sourceBuffer.appendBuffer(arrayBuffer);
});
}
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