浏览器通过原生JS实现录音功能

• 一. AudioContext介绍
• 二. getUserMedia介绍
• 三. MediaRecorder介绍
• 四. 录音执行流程
• 五. 主要代码简述
• 六. Vue样式
• 七. Vue完整代码
• 八. 常见问题

if (!window.AudioContext) {window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext;
}

// 老版浏览器可能根本没有实现mediaDevices, 为其设置一个空对象
if (!navigator.mediaDevices) {navigator.mediaDevices = {};
}
if (!navigator.mediaDevices.getUserMedia) {navigator.mediaDevices.getUserMedia = function (constraints) {let getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;// 浏览器不支持if (!getUserMedia) {return Promise.reject(new Error('您的浏览器暂不支持 getUserMedia !'));}// 包装老版 getUserMediareturn new Promise((resolve, reject) => getUserMedia.call(navigator, constraints, resolve, reject));}
}

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methods: {start() {// 停止之前的录制内容this.$mediaRecorder && this.$mediaRecorder.stop();if (!window.AudioContext) {window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext;}// 参考 https://developer.mozilla.org/zh-CN/docs/Web/API/MediaDevices/getUserMedia// 老版浏览器可能根本没有实现mediaDevices, 为其设置一个空对象if (!navigator.mediaDevices) {navigator.mediaDevices = {};}if (!navigator.mediaDevices.getUserMedia) {navigator.mediaDevices.getUserMedia = function (constraints) {let getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;// 浏览器不支持if (!getUserMedia) {return Promise.reject(new Error('您的浏览器暂不支持 getUserMedia !'));}// 包装老版 getUserMediareturn new Promise((resolve, reject) => getUserMedia.call(navigator, constraints, resolve, reject));}}// 参数// let constraints = {audio: true, video: true}; // 请求不带任何参数的音频和视频let constraints = {audio: true};  // 请求音频let mediaStream = navigator.mediaDevices.getUserMedia(constraints);mediaStream.then((stream) => {console.info("打开成功!")let audioContext = new AudioContext();// 创建一个新的音视频对象let destination = audioContext.createMediaStreamDestination();// 创建音视频源let mediaStreamSource = audioContext.createMediaStreamSource(stream);// 将音视频源 链接 到新音视频对象 中mediaStreamSource.connect(destination);// 参考 https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/MediaRecorder// 媒体录制接口let mediaRecorder = new MediaRecorder(destination.stream, {audioBitsPerSecond: 16000});let chunks = [];// 有可用数据流时触发，e.data即需要的音视频数据mediaRecorder.ondataavailable = (e) => chunks.push(e.data);// 间视频录制结束时触发mediaRecorder.onstop = () => {// 通过Blob数据块, 合成完整的Blob块数据let blob = new Blob(chunks, {'type': 'audio/mpeg'});// 通过Blob合建对象URL本地地址let url = URL.createObjectURL(blob);// 绑定到 audio 元素上this.$refs.recordPlayer.src = url;};// 將 mediaRecorder 对象扔到全局this中, 用于其他方法调用this.$mediaRecorder = mediaRecorder;// 录制开始mediaRecorder.start();}, () => {console.log("打开失败!");});},stop() {// 返回录制的二进制数据, 调用这个方法后会生成一个新的Blob对象this.$mediaRecorder.requestData();// 停止录制this.$mediaRecorder.stop();},
},

<template><div style="height: 100%; width: 100%;"><div><audio ref="recordPlayer" controls src=""/><div></div><ButtonGroup><Button size="small" @click="start">开始</Button><Button size="small" @click="stop">结束</Button></ButtonGroup></div></div>
</template><script>export default {name: "home",mounted() {},methods: {start() {// 停止之前的录制内容this.$mediaRecorder && this.$mediaRecorder.stop();if (!window.AudioContext) {window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext;}// 参考 https://developer.mozilla.org/zh-CN/docs/Web/API/MediaDevices/getUserMedia// 老版浏览器可能根本没有实现mediaDevices, 为其设置一个空对象if (!navigator.mediaDevices) {navigator.mediaDevices = {};}if (!navigator.mediaDevices.getUserMedia) {navigator.mediaDevices.getUserMedia = function (constraints) {let getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;// 浏览器不支持if (!getUserMedia) {return Promise.reject(new Error('您的浏览器暂不支持 getUserMedia !'));}// 包装老版 getUserMediareturn new Promise((resolve, reject) => getUserMedia.call(navigator, constraints, resolve, reject));}}// 参数// let constraints = {audio: true, video: true}; // 请求不带任何参数的音频和视频let constraints = {audio: true};  // 请求音频let mediaStream = navigator.mediaDevices.getUserMedia(constraints);mediaStream.then((stream) => {console.info("打开成功!")let audioContext = new AudioContext();// 创建一个新的音视频对象let destination = audioContext.createMediaStreamDestination();// 创建音视频源let mediaStreamSource = audioContext.createMediaStreamSource(stream);// 将音视频源 链接 到新音视频对象 中mediaStreamSource.connect(destination);// 参考 https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/MediaRecorder// 媒体录制接口let mediaRecorder = new MediaRecorder(destination.stream, {audioBitsPerSecond: 16000});let chunks = [];// 有可用数据流时触发，e.data即需要的音视频数据mediaRecorder.ondataavailable = (e) => chunks.push(e.data);// 间视频录制结束时触发mediaRecorder.onstop = () => {// 通过Blob数据块, 合成完整的Blob块数据let blob = new Blob(chunks, {'type': 'audio/mpeg'});// 通过Blob合建对象URL本地地址let url = URL.createObjectURL(blob);// 绑定到 audio 元素上this.$refs.recordPlayer.src = url;};// 將 mediaRecorder 对象扔到全局this中, 用于其他方法调用this.$mediaRecorder = mediaRecorder;// 录制开始mediaRecorder.start();}, () => {console.log("打开失败!");});},stop() {// 返回录制的二进制数据, 调用这个方法后会生成一个新的Blob对象this.$mediaRecorder.requestData();// 停止录制this.$mediaRecorder.stop();},},}
</script><style scoped>
</style>