音视频通话

Web网页音视频通话之Webrtc相关操作(一)

2022-07-03  本文已影响0人  HeloWxl

目录

打开摄像头/关闭摄像头

效果图

image.png image.png

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>打开摄像头</title>
    <link rel="stylesheet" href="../../../static/layui/css/layui.css">
</head>
<body>
<div id="container">
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <video id="video-local" autoplay playsinline width="400px" height="400px"></video>
        </div>
    </div>
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <button type="button" class="layui-btn layui-btn-normal" onclick="openCamera()">打开摄像头</button>
            <button type="button" class="layui-btn layui-btn-danger" onclick="stopVideo()">关闭摄像头</button>
        </div>
    </div>
    <blockquote class="layui-elem-quote layui-text" style="margin-top: 15px;">
        <p>显示摄像头预览的内容,网页上由元素video来呈现。</p>
        <p>点击打开摄像头按钮后,浏览器会询问是否允许,请点击“允许”。</p>
    </blockquote>
</div>
</body>
</html>

javaScript

   let videoElem = document.querySelector('video');

    /**
     * MediaDevices.getUserMedia()方法在用户允许后,按照请求,拿到stream。 stream可以包含视频或音频。前面的设定里,我们只使用视频。
     * 如果用户拒绝了使用摄像头申请,或者申请的媒体不可用,即表现为被拒绝。 用户拒绝会报NotAllowedError,找不到符合要求的设备会报NotFoundError DOMException。
     * @param e
     * @returns {Promise<void>}
     */
    function openCamera() {
        if (window.stream != null) {
            alert('摄像头已打开,请勿重新打开摄像头');
            return false;
        }
        const constraints = {
            audio: true,
            video: true
        };
        navigator.mediaDevices.getUserMedia(constraints).then(gotStream).catch(error => {
            console.error(error)
        });
    }

    /**
     * 成功获取到流
     * @param stream
     */
    function gotStream(stream) {
        window.stream = stream;
        videoEle.srcObject = stream;
    }

    /**
     *  关闭摄像头
     *  获取到video中的流,并将流中的轨道关闭
     */
    function stopVideo() {
        // 获取video中的流
        const stream = videoElem.srcObject;
        // 判断stream 是否为空
        if (stream == null) {
            return;
        }
        // 获取流中的所有轨道
        const tracks = stream.getTracks();
        tracks.forEach(function (track) {
            track.stop();
        });
        videoElem.srcObject = null;
        window.stream = null;
    }

静音/解除静音

效果图

image.png 静音开启.png 解除静音.png

前端代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>静音-解除静音</title>
    <link rel="stylesheet" href="../../../static/layui/css/layui.css">
</head>
<body>
<div id="container">
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <video id="video-local" autoplay playsinline width="400px" height="400px"></video>
        </div>
    </div>
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <button type="button" class="layui-btn layui-btn-normal" onclick="openCamera()">打开摄像头</button>
            <button id="mute" type="button" class="layui-btn layui-btn-normal" onclick="muted()">静音</button>
            <button id="unmute" type="button" class="layui-btn layui-btn-normal" onclick="unmuted()">解除静音</button>
        </div>
    </div>
    <blockquote class="layui-elem-quote layui-text" style="margin-top: 15px;">
        <p>1.显示摄像头预览的内容,网页上由元素video来呈现。</p>
        <p>2.点击打开摄像头按钮后,浏览器会询问是否允许,请点击“允许”。</p>
        <p>3.打开摄像头获取到浏览器摄像头数据后,可以对获取到的流数据进行静音以及解除静音相关操作</p>
    </blockquote>
</div>
</body>
</html>

javaScript

    const constraints = {
        audio: true,
        video: true
    };

    let localStream = null;
    let videoEle = document.querySelector('video');
    /**
     * MediaDevices.getUserMedia()方法在用户允许后,按照请求,拿到stream。 stream可以包含视频或音频。前面的设定里,我们只使用视频。
     * 如果用户拒绝了使用摄像头申请,或者申请的媒体不可用,即表现为被拒绝。 用户拒绝会报NotAllowedError,找不到符合要求的设备会报NotFoundError DOMException。
     * @param e
     * @returns {Promise<void>}
     */
     function openCamera() {
        if(localStream!=null){
            alert('摄像头已打开,请勿重新打开摄像头');
            return false;
        }
         navigator.mediaDevices.getUserMedia(constraints).then(stream=>{
            localStream = stream;
            videoEle.srcObject = stream;
        }).catch(error=>{
            alert('打开摄像头失败');
            console.error('打开摄像头失败',error)
        });
    }

    function muted() {
        if(localStream==null){
            alert('请打开音视频');
            return false;
        }
        const tracks = localStream.getTracks();
        tracks.forEach(track => {
            if(track.kind === 'audio'){
                track.enabled = false
            }
            console.log(track)
        });
        alert('静音开启,u can`t speak ')
    }

    function unmuted() {
        if(localStream==null){
            alert('请打开音视频');
            return false;
        }
        const tracks = localStream.getTracks();
        tracks.forEach(track => {
            if(track.kind === 'audio'){
                track.enabled = true
            }
            console.log(track)
        });
        alert('解除静音,u can speak ')
    }
}

打开视频/关闭视频

效果图

image.png 打开视频.png 关闭视频.png

前端代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>打开视频/关闭视频</title>
    <link rel="stylesheet" href="../../../static/layui/css/layui.css">
</head>
<body>
<div id="container">
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <video id="video-local" autoplay playsinline width="400px" height="400px"></video>
        </div>
    </div>
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <button type="button" class="layui-btn layui-btn-normal" onclick="openCamera()">打开摄像头</button>
            <button id="openVideo"  type="button" class="layui-btn layui-btn-normal" onclick="openVideo()">打开视频</button>
            <button id="closeVideo"  type="button" class="layui-btn layui-btn-normal" onclick="closeVideo()">关闭视频</button>
        </div>
    </div>
    <blockquote class="layui-elem-quote layui-text" style="margin-top: 15px;">
        <p>1.显示摄像头预览的内容,网页上由元素video来呈现。</p>
        <p>2.点击打开摄像头按钮后,浏览器会询问是否允许,请点击“允许”。</p>
        <p>3.打开摄像头获取到浏览器摄像头数据后,可以对获取到的流数据进行打开视频/关闭视频相关操作</p>
    </blockquote>
</div>

</body>
</html>

javaScript

 const constraints = {
        audio: true,
        video: true
    };

    let localStream = null;
    let videoEle = document.querySelector('video');
    /**
     * MediaDevices.getUserMedia()方法在用户允许后,按照请求,拿到stream。 stream可以包含视频或音频。前面的设定里,我们只使用视频。
     * 如果用户拒绝了使用摄像头申请,或者申请的媒体不可用,即表现为被拒绝。 用户拒绝会报NotAllowedError,找不到符合要求的设备会报NotFoundError DOMException。
     * @param e
     * @returns {Promise<void>}
     */
     function openCamera() {
        if(localStream!=null){
            alert('摄像头已打开,请勿重新打开摄像头');
            return false;
        }
         navigator.mediaDevices.getUserMedia(constraints).then(stream=>{
            localStream = stream;
            videoEle.srcObject = stream;
        }).catch(error=>{
            alert('打开摄像头失败');
            console.error('打开摄像头失败',error)
        });
    }

    function openVideo() {
        if(localStream==null){
            alert('请打开音视频');
            return false;
        }
        const tracks = localStream.getTracks();
        tracks.forEach(track => {
            if(track.kind === 'video'){
                track.enabled = true
            }
            console.log(track)
        });
        alert('打开视频,u can see u ')
    }

    function closeVideo() {
        if(localStream==null){
            alert('请打开音视频');
            return false;
        }
        const tracks = localStream.getTracks();
        tracks.forEach(track => {
            if(track.kind === 'video'){
                track.enabled = false
            }
            console.log(track)
        });
        alert('关闭视频,u can`t see u ')
    }

视频截图

效果图

image.png 截取图.png

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>截屏</title>
    <link rel="stylesheet" href="../../../static/layui/css/layui.css">

</head>
<body>
<div id="container">
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <video id="video-local" autoplay playsinline width="400px" height="400px"></video>
        </div>
    </div>
    <div class="layui-row">
        <div class="layui-col-xs6 layui-col-md12" style="text-align: center">
            <button type="button" class="layui-btn layui-btn-normal" onclick="openCamera()">打开摄像头</button>
            <button type="button" class="layui-btn layui-btn-normal" onclick="getCapure()">截图</button>
        </div>
    </div>
    <canvas id="mainCanvas"></canvas>
    <div id="list" style="display: grid; grid-template-columns: repeat(auto-fill, 100px);
    column-gap: 20px; row-gap: 20px;"></div>
    <blockquote class="layui-elem-quote layui-text" style="margin-top: 15px;">
        <p>1.获取摄像头数据,点击截图,展示截图数据</p>
    </blockquote>
</div>
</body>
</html>

javaScript

 const video = document.querySelector('video');
    const constraints = {
        audio: false,
        video: true
    };

    const list = document.querySelector('#list'); // 拿来存放多个元素

    function openCamera() {
        navigator.mediaDevices.getUserMedia(constraints).then(gotStream).catch(onError);
    }

    /**
     * 成功获取流数据
     * @param stream
     */
    function gotStream(stream) {
        window.stream = stream;
        video.srcObject = stream;
    }
    /**
     * 获取流发生错误
     * @param stream
     */
    function onError(error) {
        console.log('navigator.MediaDevices.getUserMedia error: ', error.message, error.name);
    }

    /**
     * 捕获
     */
    function getCapure(){
        const mCanvas = window.canvas = document.querySelector('#mainCanvas');
        mCanvas.width = 480;
        mCanvas.height = 360;

        // 开始截取
        mCanvas.width = video.videoWidth;
        mCanvas.height = video.videoHeight;
        mCanvas.getContext('2d').drawImage(video, 0, 0, mCanvas.width, mCanvas.height);
        // 新增1张
        var divItem = document.createElement("div");
        divItem.style.display = "block";
        divItem.width = 100;
        divItem.height = divItem.width * video.videoHeight / video.videoWidth; // 计算一下比例
        divItem.style.width = divItem.width + "px";
        divItem.style.height = divItem.height + "px";
        var c1 = document.createElement("canvas");
        c1.width = divItem.width;
        c1.height = divItem.height;
        c1.getContext('2d').drawImage(video, 0, 0, mCanvas.width, mCanvas.height, 0, 0, c1.width, c1.height);
        divItem.appendChild(c1);
        list.appendChild(divItem);
    }

    /**
     * 清除记录
     */
    function clear(){
        var child = list.lastElementChild;
        while (child) {
            list.removeChild(child);
            child = list.lastElementChild;
        }
    }

写在最后学习参考视频讲解比较详细:https://space.bilibili.com/394612055/video?tid=0&page=2&keyword=&order=pubdate

image.png
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