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基于HTML5的简单任意原生视频截图，可简单控制快进/逐帧/视频调速
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// ==UserScript==
// @name HTML5视频截图器
// @namespace indefined
// @supportURL https://github.com/indefined/UserScripts/issues
// @version 0.3.8
// @description 基于HTML5的简单任意原生视频截图，可简单控制快进/逐帧/视频调速
// @author indefined
// @include *://*
// @run-at document-idle
// @grant GM_registerMenuCommand
// @license MIT
// ==/UserScript==
function HTML5VideoCapturer(){
'use strict';
if (document.querySelector('#HTML5VideoCapture')) return;
const childs = "undefined"==typeof(unsafeWindow)?window.frames:unsafeWindow.frames;
let videos,video,selectId;
function videoShot(down){
if (!video) return postMsg('shot',down);
const canvas = document.createElement("canvas");
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
canvas.getContext('2d')
.drawImage(video, 0, 0, canvas.width, canvas.height);
try{
if (!down) throw `i don't want to do it.`;
const a = document.createElement('a');
a.href = canvas.toDataURL('image/jpeg', 0.95);
a.download = `${document.title}_${Math.floor(video.currentTime/60)}'${(video.currentTime%60).toFixed(3)}''.jpg`;
document.head.appendChild(a);
a.click();
document.head.removeChild(a);
}catch(e){
const imgWin = open("",'_blank');
canvas.style = "max-width:100%";
imgWin.document.body.appendChild(canvas);
}
}
function videoPlay(){
if (!video) return postMsg('play');
video.paused?video.play():video.pause();
videoStatusUpdate();
}
function videoSpeedChange(speed){
if (!video) return postMsg('speed',speed);
video.playbackRate = speed;
videoStatusUpdate();
}
function videoStep(offset){
if (!video) return postMsg('step',offset);
if (Math.abs(offset)<1&&!video.paused) videoPlay();
video.currentTime += offset;
if(video.currentTime<0) video.currentTime = 0;
}
function videoDetech(){
videos = document.querySelectorAll('video');
if (window!=top){
top.postMessage({
action:'captureReport',
about:'videoNums',
length:videos.length,
id:window.captureId
},'*');
}else{
while(selector.firstChild) selector.removeChild(selector.firstChild);
appendVideo(videos);
setTimeout(()=>{
if (selector.childNodes.length) return videoSelect(selector.value);
const toast = document.createElement('div');
toast.style = `position: fixed;top: 50%;left: 50%;z-index: 999999;padding: 10px;background: darkcyan;transform: translate(-50%);color: #fff;border-radius: 6px;`
toast.innerText = '当前页面没有检测到HTML5视频';
document.body.appendChild(toast);
setTimeout(()=>toast.remove(),2000);
},100);
}
if (childs.length){
[].forEach.call(childs,(w,i)=>w.postMessage({
action:'captureDetech',
id:window.captureId==undefined?i:window.captureId+'-'+i
},'*'));
}
console.log(window.captureId,videos);
}
function videoSelect(id){
selectId = id;
if (videos[id]){
video = videos[id];
video.scrollIntoView();
videoStatusUpdate();
}
else {
video = undefined;
postMsg('select');
}
}
function videoStatusUpdate(){
if (window==top) {
play.innerText = video.paused?"▶":"❚❚";
speed.value = video.playbackRate;
}
else{
top.postMessage({
action:'captureReport',
about:'videoStatus',
paused:video.paused,
speed:video.playbackRate,
id:window.captureId
},'*');
}
}
function postMsg(type,data){
if (selectId==undefined||selectId=='') return;
const ids = selectId.split('-');
if (ids.length>1){
const target = ids.shift();
if (!childs[target]) return;
childs[target].postMessage({
action:'captureControl',
target:window.captureId==undefined?target:window.captureId+'-'+target,
todo:type,
id:ids.join('-'),
value:data
},'*');
}
}
//控制事件接收仅在iframe中执行
if (window!=top) {
window.addEventListener('message', function(ev) {
//console.info('frame recive:',ev.data);
if (ev.source!=window.parent || !ev.data.action) return;
else if(ev.data.action=='captureDetech'){
window.captureId = ev.data.id;
videoDetech();
}else if(ev.data.action=='captureControl' && ev.data.target==window.captureId){
switch (ev.data.todo){
case 'play':
videoPlay(ev.data.value);
break;
case 'shot':
videoShot(ev.data.value);
break;
case 'step':
videoStep(ev.data.value);
break;
case 'speed':
videoSpeedChange(ev.data.value);
break;
case 'select':
videoSelect(ev.data.id);
break;
default:
break;
}
}
});
return;
}
//以下UI控制界面及事件在iframe中不执行
let panel,selector,speed,play;
function topReciver(ev) {
//console.info('top recive:',ev.data);
if (ev.data.action!='captureReport') return;
if (ev.data.about=='videoNums') appendVideo(ev.data);
else if (ev.data.about=='videoStatus'&&selector.value.startsWith(ev.data.id)){
play.innerText = ev.data.paused?"▶":"❚❚";
speed.value = ev.data.speed;
}
}
function _c(config){
if(config instanceof Array) return config.map(_c);
const item = document.createElement(config.nodeType);
for(const i in config){
if(i=='nodeType') continue;
if(i=='childs' && config.childs instanceof Array) {
config.childs.forEach(child=>{
if(child instanceof HTMLElement) item.appendChild(child);
else item.appendChild(_c(child));
})
continue;
}
else if(i=='parent') {
config.parent.appendChild(item);
continue;
}
item[i] = config[i];
}
return item;
}
function appendVideo(v){
if (v&&v.length){
for (let i=0;i<v.length;i++){
_c({
nodeType:'option',
value:v.id!=undefined?v.id+'-'+i:i,
innerText:v.id!=undefined?v.id+'-'+i:i,
parent:selector
})
}
}
}
function dialogMove(ev){
if (ev.type=='mousedown'){
panel.tOffset = ev.pageY-panel.offsetTop;
panel.lOffset = ev.pageX-panel.offsetLeft;
document.body.addEventListener('mousemove',dialogMove);
document.body.addEventListener('mouseup',dialogMove);
}
else if (ev.type=='mouseup'){
document.body.removeEventListener('mousemove',dialogMove);
document.body.removeEventListener('mouseup',dialogMove);
}
else{
panel.style.top = ev.pageY-panel.tOffset+'px';
panel.style.left = ev.pageX-panel.lOffset+'px';
}
}
panel = _c({
nodeType:'div',id:'HTML5VideoCapture',
style:'position:fixed;top:40px;left:30px;z-index:2147483647;padding:5px 0;background:darkcyan;font-family:initial;border-radius:4px;font-size:12px;text-align:left',
childs:[
{
nodeType:'style',
innerHTML:'div#HTML5VideoCapture option{color:#000;}'
+ 'div#HTML5VideoCapture>*{margin:0 0 5px 10px;}'
+ 'div#HTML5VideoCapture>span,div#HTML5VideoCapture>span>*{white-space:nowrap;}'
+ 'div#HTML5VideoCapture *{font-family:initial;color:#fff;background:transparent;line-height:20px;height:20px;box-sizing:content-box;vertical-align:top;}'
+ 'div#HTML5VideoCapture .h5vc-block {border:1px solid #ffffff99;border-radius:2px;padding:1px 4px;min-width:unset;}'
+ 'div#HTML5VideoCapture .h5vc-block:hover {border-color: #fff;}'
},
{
nodeType:'div',
innerText:'HTML5视频截图工具',
style:'cursor:move;user-select:none;font-size:14px;height:auto;padding-left:0;min-width:60px;margin-right:10px;',
onmousedown:dialogMove,
ondblclick:()=>{
speed.step = 0.25;
videoSpeedChange(speed.value=1);
}
},
{
nodeType:'button',
className:'h5vc-block',
style:'width:20px',
innerText:'⟲',
title:'重新检测页面中的视频',
onclick:videoDetech
},
selector = _c({
nodeType:'select',
className:'h5vc-block',
title:'选择视频',
style:'width:unset;min-width:30px',
onchange: ()=>videoSelect(selector.value)
}),
speed = _c({
nodeType:'input',
className:'h5vc-block',
type:'number',step:0.25,min:0,
title:'视频速度,双击截图工具标题恢复原速',
style:'width:40px;',
oninput:()=>{
speed.step = speed.value<1?0.1:0.25;
videoSpeedChange(+speed.value);
}
}),
play = _c({
nodeType:'button',
className:'h5vc-block',
style:'width:24px',
innerText:'▶',
onclick:videoPlay
}),
{
nodeType:'button',
className:'h5vc-block',
innerText:'<<',
title:'后退1s,按住shift 5s,ctrl 10s,alt 60s,多按相乘',
onclick:e=>{
let offset = -1;
if(e.ctrlKey) offset *= 5;
if(e.shiftKey) offset *= 10;
if(e.altKey) offset *= 60;
videoStep(offset);
}
},
{
nodeType:'button',
className:'h5vc-block',
style:'margin-left:0',
innerText:'<',
title:'上一帧(1/60s)',
onclick:()=>videoStep(-1/60)
},
{
nodeType:'button',
className:'h5vc-block',
style:'width:20px',
innerText:'⚫',
title:'新建标签页打开视频截图',
onclick:()=>videoShot()
},
{
nodeType:'button',
className:'h5vc-block',
style:'margin-left:0',
innerText:'↓',
title:'直接下载截图（如果可用）',
onclick:()=>videoShot(true)
},
{
nodeType:'button',
className:'h5vc-block',
innerText:'>',
title:'下一帧(1/60s)',
onclick:()=>videoStep(1/60)
},
{
nodeType:'button',
className:'h5vc-block',
style:'margin-left:0',
innerText:'>>',
title:'前进1s,按住shift 5s,ctrl 10s,alt 60s,多按相乘',
onclick:e=>{
let offset = 1;
if(e.ctrlKey) offset *= 5;
if(e.shiftKey) offset *= 10;
if(e.altKey) offset *= 60;
videoStep(offset);
}
},
{
nodeType:'button',
className:'h5vc-block',
innerText:'⏏',
title:'关闭截图工具栏',
style:'margin-right:10px;width:20px',
onclick:()=> {
document.body.removeChild(panel);
window.removeEventListener('message', topReciver);
}
}
],
parent:document.body
});
window.addEventListener('message', topReciver);
videoDetech();
}
if ('function'==typeof(GM_registerMenuCommand) && window==top){
GM_registerMenuCommand('启用HTML5视频截图器',HTML5VideoCapturer);
}else HTML5VideoCapturer();