基于HTML5的简单原生视频截图，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 0.3.4
// @description 基于HTML5的简单原生视频截图，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();
a.remove();
}catch(e){
const imgWin = open("",'_blank');
canvas.style = "max-width:100%";
imgWin.document.body.appendChild(canvas);
}
}
function videoPlay(id){
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(){
if (window==top){
while(selector.firstChild) selector.removeChild(selector.firstChild);
}
videos = document.querySelectorAll('video');
if (window!=top){
top.postMessage({
action:'captureReport',
about:'videoNums',
length:videos.length,
id:window.captureId
},'*');
}else{
appendSelector(videos);
setTimeout(()=>{
if (selector.childNodes.length) return videoSelect(selector.value);
video = undefined;
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(videos);
}
function videoSelect(id){
selectId = id;
if (videos[id]){
video = videos[id];
video.scrollIntoView();
videoStatusUpdate();
}
else {
postMsg('select');
}
}
function videoStatusUpdate(){
if (window==top) {
play.value = video.paused?"播放":"暂停";
speed.value = video.playbackRate;
}
else{
top.postMessage({
action:'captureReport',
about:'videoStatus',
value:video.paused,
id:window.captureId
},'*');
}
}
window.addEventListener('message', function(ev) {
//console.info(ev.data);
if (!ev.data.action) return;
switch (ev.data.action){
case 'captureDetech':
if (ev.source!=window.parent) return;
window.captureId = ev.data.id;
videoDetech();
break;
case 'captureControl':
if (ev.source!=window.parent||ev.data.target!=window.captureId) return;
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':
videoSelect(ev.data.value);
break;
case 'select':
videoSelect(ev.data.id);
break;
default:
break;
}
break;
case 'captureReport':
if (ev.data.about=='videoNums') appendSelector(ev.data);
else if (ev.data.about=='videoStatus'&&selector.value.startsWith(ev.data.id)){
play.value = ev.data.value?"播放":"暂停";;
speed.value = video.playbackRate;
}
break;
}
});
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
},'*');
}
}
if (window!=top) return;
function appendSelector(v){
if (v&&v.length){
for (let i=0;i<v.length;i++){
const item = document.createElement('option');
item.value = v.id!=undefined?v.id+'-'+i:i;
item.innerText = v.id!=undefined?v.id+'-'+i:i;
selector.appendChild(item);
}
}
}
function dialogMove(ev){
if (ev.type=='mousedown'){
panel.tOffset = ev.pageY-panel.offsetTop;
panel.lOffset = ev.pageX-panel.offsetLeft;
document.body.addEventListener('mousemove',dialogMove);
}
else if (ev.type=='mouseup'){
document.body.removeEventListener('mousemove',dialogMove);
}
else{
panel.style.top = ev.pageY-panel.tOffset+'px';
panel.style.left = ev.pageX-panel.lOffset+'px';
}
}
const panel = document.createElement('div');
panel.id = "HTML5VideoCapture";
panel.style = `position:fixed;top:40px;left:30px;z-index:2147483647;padding:5px 0;background:darkcyan;font-family:initial;border-radius:4px;font-size:12px;`;
panel.innerHTML = `<div style="cursor:move;user-select:none;color:#fff;border: none;font-size:15px;height:auto;padding-left:0;min-width:60px">HTML5视频截图器</div>\
<input type="button" value="检测" title="重新检测页面中的视频"><select title="选择视频" style="width:unset"></select>\
<input type="number" value="1" step=0.25 title="视频速度,双击截图器标题恢复原速" style="width:40px;" min=0><input type="button" value="播放">\
<input type="button" value="<<" title="后退1s,按住shift 5s,ctrl 10s,alt 60s,多按相乘"><input type="button" value="<" title="后退1帧(1/60s)" style="margin-left: 0;">\
<input type="button" value="截图" title="新建标签页打开视频截图"><input type="button" value="↓" style="margin-left: 0;" title="直接下载截图（如果可用）">\
<input type="button" value=">" title="前进1帧(1/60s)"><input type="button" value=">>" title="前进1s,按住shift 5s,ctrl 10s,alt 60s,多按相乘" style="margin-left: 0;">\
<input type="button" value="关闭" style="margin-right:10px;"><style>div#HTML5VideoCapture>*:hover {border-color: #fff;}div#HTML5VideoCapture>*{\
line-height:20px;height:20px;border:1px solid #ffffff99;border-radius:2px;color:#fff;margin:0 0 5px 10px;\
padding:2px 6px;vertical-align:bottom;font-family:initial;background:transparent;box-sizing:content-box}</style>`
const [title,detech,selector,speed,play,preS,preFrame,capture,captureDown,nextFrame,nextS,close] = panel.childNodes;
title.onmousedown = dialogMove;
title.onmouseup = dialogMove;
selector.onchange = ()=>videoSelect(selector.value);
detech.onclick = videoDetech;
play.onclick = videoPlay;
title.ondblclick = ()=>{
speed.step = 0.25;
videoSpeedChange(speed.value=1);
}
speed.oninput = ()=>{
speed.step = speed.value<1?0.1:0.25;
videoSpeedChange(+speed.value);
}
preS.onclick = e=>{
let offset = -1;
if(e.ctrlKey) offset *= 5;
if(e.shiftKey) offset *= 10;
if(e.altKey) offset *= 60;
videoStep(offset);
};
preFrame.onclick = ()=>videoStep(-1/60);
nextS.onclick = e=>{
let offset = 1;
if(e.ctrlKey) offset *= 5;
if(e.shiftKey) offset *= 10;
if(e.altKey) offset *= 60;
videoStep(offset);
};
nextFrame.onclick = ()=>videoStep(1/60);
capture.onclick = ()=>videoShot();
captureDown.onclick = ()=>videoShot(true);
close.onclick = ()=>panel.remove();
document.body.appendChild(panel);
videoDetech();
}
if ('function'==typeof(GM_registerMenuCommand) && window==top){
GM_registerMenuCommand('启用HTML5视频截图器',HTML5VideoCapturer);
}else HTML5VideoCapturer();