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@takahasinaoki(なおき)

video.js をカスタマイズしてマウスだけで動画の再生速度変更や１０秒スキップなどを可能にする

Last updated at Posted at 2021-05-29

やりたかったこと

ノートＰＣで動画を大画面のテレビに出力し、ノートＰＣのふたを閉じてマウスだけで動画再生画面の１０秒スキップや再生速度の変更を１クリックだけで出来るようにしたかった。

外観

image

画面上部のテキストボックスに、再生させたい動画のURLを入力して開くボタンで動画を読込みます

ソース

Githubにコードがあります。

video.html
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>動画プレイヤー</title>
<link href="https://vjs.zencdn.net/7.10.2/video-js.css" rel="stylesheet" />
<link rel="stylesheet" type="text/css" href="video.css">
<script src="https://vjs.zencdn.net/7.10.2/video.min.js"></script>
<script src="video.js"></script>
</head>
<body>
    <textarea id="url" class="uri"></textarea>
    <button type="button" onClick="onOpen()">開く</button>
    <video id="my-player" class="video-js" width="800"height="450"></video>
</body>
</html>
video.js
const skipTimes = [-10, -3, 10, 30];
let player;
window.onload = onLoad;

function onLoad() {
    const herf = new URL(window.location.href);
    const videoUri = herf.search.substr(1);
    document.getElementById("url").value = videoUri;
    CreateVideoPlayer();
};

function onOpen() {
    let url = document.getElementById("url").value;
    // let url = 'https://vjs.zencdn.net/v/oceans.mp4';
    if (!url) {return};
    loadVideo(url);
};

function loadVideo(url) {
    const data = {
        src: url,
        type: 'video/mp4',
    };
    player.pause();
    player.src(data);
    player.load(data);
};

function onPause(e) {
    if (e.target.tagName.toLowerCase() != "div") {return};
    if (player.paused()){
        player.play();
    }else{
        player.pause();
    }
};

function changeRate(rate) {
    const newRate = (player.playbackRate() + rate).toFixed(1);
    player.playbackRate(newRate);
};

function skip(sec) {
    let newTime = player.currentTime() + sec;
    player.currentTime(newTime);
};

function CreateVideoPlayer() {
    player = videojs('my-player', { 
        controls: true, 
        preload: 'auto',
        autoplay: false,
        muted: false,
        controlBar: {
            children: [
                {name: 'playToggle'},         
                {name: 'progressControl'},   
                {name: 'currentTimeDisplay'}, 
                {name: 'TimeDivider'},   
                {name: 'durationDisplay'},  
                {name: 'volumePanel',  
                    inline: true,  
                },
                {name: 'FullscreenToggle'},
                ]
            },
        }
    );

    // skipボタンの追加
    player.addChild(CreateSkip(), {});
    document.getElementById("skip").addEventListener("click", onPause);

    // controlbar内にskipボタン追加
    player.getChild("controlBar").addChild(CreateControlBarSkip(), {}, 6);

    // 再生速度変更ボタンの追加
    player.getChild("controlBar").addChild(CreateRateChange(), {}, 6);
    player.on("ratechange",function(){ // 再生速度変更時
        document.getElementById("ratevalue").innerHTML = (player.playbackRate()).toFixed(1) + 'x'; 
        }
    );
};

// skipボタンコンポーネントの作成
function CreateSkip() {
    let newElement = `
        <div class="skip" id="skip">
            <div class="skipbtn">
                <svg onClick="skip({???0})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                    <path d="M1,16 c0,8.284,6.716,15,15,15s15-6.716,15-15S24.284,1,16,1C10.657,1,5.966,3.794,3.309,8" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <polyline fill="none" points="3,0 3,8 11,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <text x="51%" y="53%" font-size="50%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                    >{???0}</text>
                </svg>
            </div>
            <div class="skipbtn">
                <svg onClick="skip({???1})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                    <path d="M1,16 c0,8.284,6.716,15,15,15s15-6.716,15-15S24.284,1,16,1C10.657,1,5.966,3.794,3.309,8" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <polyline fill="none" points="3,0 3,8 11,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <text x="51%" y="53%" font-size="50%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                    >{???1}</text>
                </svg>
            </div>
            <div class="skipbtn">
                <svg onClick="skip({???2})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                    <path d="M31,16 c0,8.284-6.716,15-15,15S1,24.284,1,16S7.716,1,16,1c5.343,0,10.034,2.794,12.691,7" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <polyline fill="none" points="29,0 29,8 21,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <text x="51%" y="53%" font-size="50%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                    >{???2}</text>
                </svg>
            </div>
            <div class="skipbtn">
                <svg onClick="skip({???3})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                    <path d="M31,16 c0,8.284-6.716,15-15,15S1,24.284,1,16S7.716,1,16,1c5.343,0,10.034,2.794,12.691,7" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <polyline fill="none" points="29,0 29,8 21,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                    <text x="51%" y="53%" font-size="50%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                    >{???3}</text>
                </svg>
            </div>
        </div>
    `
    for(i=0;i<4;i++){
        newElement = newElement.replace("{???" + i +"}", skipTimes[i]);
        newElement = newElement.replace("{???" + i +"}", Math.abs(skipTimes[i]));
    }
    const Component = videojs.getComponent('Component');
    const result = new Component(player);
    result.el().innerHTML = newElement;
    return result;
}

// controlbar内のskipボタンコンポーネントの作成
function CreateControlBarSkip() {
    let newElement = `
        <div class="skip2">
            <svg onClick="skip({???0})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                <path d="M1,16 c0,8.284,6.716,15,15,15s15-6.716,15-15S24.284,1,16,1C10.657,1,5.966,3.794,3.309,8" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <polyline fill="none" points="3,0 3,8 11,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <text x="51%" y="53%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                >{???0}</text>
            </svg>
            <svg onClick="skip({???1})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                <path d="M1,16 c0,8.284,6.716,15,15,15s15-6.716,15-15S24.284,1,16,1C10.657,1,5.966,3.794,3.309,8" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <polyline fill="none" points="3,0 3,8 11,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <text x="51%" y="53%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                >{???1}</text>
            </svg>
            <svg onClick="skip({???2})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                <path d="M31,16 c0,8.284-6.716,15-15,15S1,24.284,1,16S7.716,1,16,1c5.343,0,10.034,2.794,12.691,7" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <polyline fill="none" points="29,0 29,8 21,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <text x="51%" y="53%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                >{???2}</text>
            </svg>
            <svg onClick="skip({???3})" width="2.5em" height="2.5em" viewBox="0 0 32 32">
                <path d="M31,16 c0,8.284-6.716,15-15,15S1,24.284,1,16S7.716,1,16,1c5.343,0,10.034,2.794,12.691,7" fill="none" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <polyline fill="none" points="29,0 29,8 21,8" stroke="#fff" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="1.5"/>
                <text x="51%" y="53%" font-family="sans-serif" text-anchor="middle" dominant-baseline="central" fill="#fff" stroke="#fff" stroke-width="0"
                >{???3}</text>
            </svg>
        </div>
    `
    for(i=0;i<4;i++){
        newElement = newElement.replace("{???" + i +"}", skipTimes[i]);
        newElement = newElement.replace("{???" + i +"}", Math.abs(skipTimes[i]));
    }
    const Component = videojs.getComponent('Component');
    const result = new Component(player);
    result.el().innerHTML = newElement;
    return result;
}

// 再生速度変更ボタンコンポーネントの作成
function CreateRateChange() {
    const Component = videojs.getComponent('Component');
    const result = new Component(player);
    result.el().innerHTML = `
        <div class="changeRate">
            <button onClick="changeRate(-0.1)">&nbsp;◀</button>
            <span onClick="player.playbackRate(1.0)" class="ratevalue" id="ratevalue">1.0x</span>
            <button onClick="changeRate(+0.1)">▶&nbsp;</button>
        </div>
    `
    return result;
}
video.css
.video-js{
    font-size: 14px;
}

/* 動画上のplayボタン */
.video-js.vjs-paused .vjs-big-play-button{ 
    display: block;
}
.video-js.vjs-error .vjs-big-play-button{
    display: none;
}

/* タイムバー */
.video-js .vjs-progress-control {
    position: absolute;
    left: 0;
    right: 0;
    width: 100%;
    height: .5em;
    top: -.5em;
}
.video-js .vjs-progress-control .vjs-load-progress,
.video-js .vjs-progress-control .vjs-play-progress,
.video-js .vjs-progress-control .vjs-progress-holder {
    height: 100%;
}
.video-js .vjs-progress-control .vjs-play-progress:before{
    display: none;
}
.video-js .vjs-progress-control .vjs-progress-holder {
    margin: 0;
}
.video-js .vjs-progress-control:hover {
    height: 1.2em;
    top: -1.2em;
}
.video-js .vjs-play-progress {
    background-color: #cc181e
}
.video-js .vjs-load-progress {
    background: rgba(255,255,255,0.3);
}

/* 画面下部のメニュー(controlbar) */
.video-js .vjs-control-bar {
    display: flex;
    background-color: rgba(0,0,0,0.3);
    color: #ffffff;
    user-select: none;
}

/* 再生時間 0:00 / 0:00  */
.video-js .vjs-time-control{
    display:inline;
    padding-left: 0px;
    padding-right: 0px;
}
.video-js .vjs-time-control span{
    vertical-align: center;
    font-size: 17px;
}
.video-js .vjs-time-divider{
    text-align: center;
}

/* 最大化ボタン  */
.video-js .vjs-fullscreen-control {
    position: absolute;
    right: 10px;
}

/*** ユーザ定義コントロール ***/
/* skipボタン */
svg {
    user-select: none;
}
.video-js .skip {
    position: absolute;
    display: flex;
    justify-content: space-evenly;
    top: 50%;
    left: 50%;
    width: 100%;
    padding-left: 20%;
    padding-right: 20%;
    transform: translateY(-50%) translateX(-50%);
    font-size: 2.5em;
    line-height: 2.3em;
    height: 2.5em;
    opacity: 0;
    transition: opacity 1.0s;
}
.skip:hover {   
    opacity: 0.6;
}
.skip svg:hover {   
    cursor : pointer;
}
.video-js .skip div{
    width: 3em;
    height: 3em;
    border-radius: 3em;
    background-color: rgba(115,133,159,0.3);
}
.video-js .skip svg{
    position: relative;
    top: 0.25em;
    left: 0.25em;
}

/* controlbar内にskipボタン */
.skip2 {
    position: absolute;
    right: 210px;
    display:inline;
    vertical-align: center;
    top: 0.5em;
    font-size: 12px;
}
.skip2 text{
    font-size: 17px;
}
.skip2 svg{
    cursor : pointer;
}

/* 再生速度変更ボタン */
.changeRate {
    position: absolute;
    right: 80px;
    font-size: 17px;
    display:inline;
    vertical-align: center;
    line-height: 2.4;
}
.changeRate button{
    cursor : pointer;
}

/*** video.js以外 ***/
.uri{
    resize: none;
    width: 100%;
}

ソースの解説

キモになると思う部分だけ紹介します

addChild()

player.getChild("controlBar").addChild(CreateControlBarSkip(), {}, 6);

ComponentオブジェクトのaddChild()メソッドの第１引数に追加したいComponentオブジェクトを指定、第３引数はオブジェクトの挿入個所（省略時は最後方に追加されます）を示しています。

el()

result.el().innerHTML = newElement;

Componentオブジェクトのel()メソッドでhtmlのElementを取得できます。
例えば、ブラウザのコンソールで

console.log(player.getChild("controlBar").el())

と打鍵すれば、videojsのcontrolBar(画面最下部分)のhtmlを確認することが出来ます。

player.on

playerオブジェクトのon()メソッドでイベントを処理させることが出来ます。

player.on("ratechange",function(){処理}); //再生速度が変更された時に処理が実行されます

他にも

player.on("canplay",function(){処理}); //再生の準備が出来たとき
player.on("pause",function(){処理}); //一時停止したとき

などなど、結構いろいろ用意されています。
詳しくは、マニュアルをご覧ください。

最後に

videojsを日本語で解説してくれているサイトはほとんど見つけることが出来なかったので、英語を理解できない中で、videojsのマニュアルを翻訳機能を使いながら試行錯誤の結果たどりついたコードなので、かなり邪道な方法で実現しているかもしれません。
でも誰かの役に立てたなら幸いです。

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