如何在Javascript / Html5中随机化视频播放列表 [英] How to randomize video playlist in Javascript / Html5
问题描述
我是JS和
的初学者我想知道如何随机化视频播放列表(JS),我想使用画布来查看受保护的视频(通过画布传递视频),然后循环视频开始再次,视频连续播放列表随机。不停机
I'm a beginner in JS and I would like to know how to randomize a video playlist (JS), i want to use a canvas to see the videos "protected" (pass the videos trough the canvas) and then loop the videos to start again, video continous playlist randomizing. Non-stop
帮助将非常感谢!提前致谢!!
Help would be really appreciated! THANKS in advance!!
推荐答案
您可以简单地以数组形式生成列表:
You can simply generate a list as an array:
var videoList = [video1url, video2url, ...];
然后使用自定义分拣机将其随机排序:
Then sort it with a custom sorter which will randomize it:
videoList.sort(function(a, b) {return 0.5 - Math.random()});
在线演示 (打开控制台查看已排序列表)。
Online demo here (open the console to see the "sorted" list).
您可以查看 这个小提琴 我刚才所做的。
For a continuous video player you can check out this fiddle I made a while ago.
var ctx = canvas.getContext('2d'), /// get canvas
w = canvas.width, /// cache dimensions
h = canvas.height,
video1 = document.createElement('video'), /// two video elements
video2 = document.createElement('video'),
isVideo1 = false, /// toggler
list = [], /// video list
current = 0, /// index
isPlaying = false; /// is video playing
/// add event handlers so we know when a video finished
video1.addEventListener('ended', play, false);
video2.addEventListener('ended', play, false);
/**
* Then we add a few videos to our list
*/
/// first arg. is always mp4 version, second anything else (ogg, webm etc)
addVideo('somevideourl1.mp4', 'somevideourl.ogg');
addVideo('somevideourl2.mp4', 'somevideour2.webm');
/// here you re-sort your list with the random (see details for list)
list.sort(function(a, b) {return 0.5 - Math.random()});
/// get first video
getVideo(list[0], play);
/// start loop
render();
/// this will start play the videos
function play(){
/// what video to start
var video = (isVideo1 === false ? video1 : video2),
next = current;
/// toggle
isVideo1 = !isVideo1;
/// get next video in list
next++;
if (next > list.length - 1) next = 0;
if (list.length > 0) getVideo(list[next]);
/// start video
video.play();
isPlaying = true;
current = next;
}
/// this draws the video frames to canvas
function render() {
if (isPlaying) {
var video = (isVideo1 === true ? video1 : video2);
ctx.drawImage(video, 0, 0, w, h);
}
requestAnimationFrame(render);
}
/// this function adds a video to the list
function addVideo(urlMP4, url) {
list.push({
urlMP4: urlMP4,
url: url,
isReady: false
})
}
/// start download a video
function getVideo(vid, callback) {
var video = (isVideo1 === false ? video1 : video2),
me = this;
video.addEventListener('canplay', canPlay, false);;
function canPlay(e) {
video.removeEventListener('canplay', canPlay, false);
vid.isReady = true;
if (typeof callback === 'function')
callback(vid);
}
if (video.canPlayType("video/mp4").length > 0) {
video.src = vid.urlMP4;
} else {
video.src = vid.url;
}
}
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