前端录制视频

js export class VideoRecording { // 录视频 mediaRecorder: MediaRecorder | null; stream: MediaStream | null; chunks: any[]; endCallback: any[]; constructor() { this.mediaRecorder = null; // 录音对象 this.stream = null; // 轨道 this.chunks = []; // 录制缓存 this.endCallback = []; // 结束回调 } create() { // 创建一个录制任务 return new Promise((resolve, reject) => { this.resetState(); navigator.mediaDevices.getUserMedia({ video: true, audio: true }).then((stream) => { this.stream = stream; const mime = MediaRecorder.isTypeSupported("video/webm\;codecs=h264") ? "video/webm\;codecs=h264" : "video/webm"; this.mediaRecorder = new MediaRecorder(stream, { mimeType: mime }); resolve({format: mime === "video/webm\;codecs=h264" ? 'mp4': 'webm'}); }).catch((err) => { reject(err); }); }); } start() { // 开始 return new Promise((resolve, reject) => { this.judgeMediaRecorderIs().then((mediaRecorder: MediaRecorder) => { mediaRecorder.start(); mediaRecorder.addEventListener('dataavailable', (e) => { this.chunks.push(e.data); this.endCallback.forEach((resolve) => { resolve(); this.endCallback.shift(); }); }); resolve(''); }).catch((err) => { reject(err); }); }); } stop() { // 结束 return new Promise((resolve, reject) => { this.judgeMediaRecorderIs().then((mediaRecorder: MediaRecorder) => { if (mediaRecorder.state === 'inactive') { return reject({code: 0, message: '已结束'}); }; mediaRecorder.stop(); this.stream.getTracks().forEach((track) => { track.stop(); }) this.endCallback.push(resolve); }).catch((err) => { reject(err); }); }); } download() { // 下载 return new Promise((resolve, reject) => { this.handleChunksToBolb().then((blob: Blob) => { let url = URL.createObjectURL(blob); let a = document.createElement('a'); a.href = url; a.download = MediaRecorder.isTypeSupported("video/webm\;codecs=h264") ? 'video.mp4' : 'video.webm'; a.click(); resolve(url); }).catch((err) => { reject(err); }); }); } viewRecording() { // 获取本地播放url return new Promise((resolve, reject) => { this.handleChunksToBolb().then((blob: Blob) => { let url = URL.createObjectURL(blob); resolve(url); }).catch((err) => { reject(err); }); }); } toFile() { // 录音缓存转file return new Promise((resolve, reject) => { this.handleChunksToBolb().then((blob: Blob) => { let filename = MediaRecorder.isTypeSupported("video/webm\;codecs=h264") ? 'video.mp4' : 'video.webm'; let fileType = filename.includes('.mp4') ? 'video/mp4' : 'video/webm'; resolve(new File([blob], filename, { type: fileType })); }).catch((err) => { reject(err); }); }); } handleChunksToBolb() { // 录音缓存转bolb return new Promise((resolve, reject) => { this.judgeChunksIs().then((chunks: any) => { let blob = new Blob(chunks, { type: MediaRecorder.isTypeSupported("video/webm\;codecs=h264") ? 'video/mp4' : chunks[0].type }) resolve(blob); }).catch((err) => { reject(err); }); }); } judgeChunksIs() { // 判断是否有录音缓存 return new Promise((resolve, reject) => { let chunks = this.chunks; if (chunks.length === 0) { return reject({code: 0, message: '没有录制的缓冲'}); }; return resolve(chunks); }); } judgeMediaRecorderIs() { // 判断是否创建录制任务 return new Promise((resolve, reject) => { let mediaRecorder = this.mediaRecorder; if (!mediaRecorder) { return reject({code: 0, message: '请先创建一个录制对象'}); }; resolve(mediaRecorder); }); } setEndCallback(callback) { // 存录音结束回调 this.endCallback.push(callback); } resetState() { // 重置状态 this.chunks = []; this.mediaRecorder = null; this.stream = null; } };

实用方法

js let myVideoRecording = new VideoRecording(); @params res: { format: 'mp4', type: String; value: 'mp4' | 'webm'; 说明：当前支持的录制格式; } myVideoRecording.create().then((res: {format: 'mp4'}) => { // 开始录制 myVideoRecording.start(); // 可选择自己注册一个结束回调, 也可以调用stop()结束成功后执行下载、播放url、转file let endRecording = () => { // 下载到本地 myVideoRecording.download(); // 本地播放url myVideoRecording.viewRecording().then((srcObject) => {}); // 转file可上传到后台服务器 myVideoRecording.toFile().then((file) => {}); }; // 存结束录音回调函数 myVideoRecording.setEndCallback(endRecording); // 手动结束录屏，then后才可以下载、获取本地播放url、转file对象 myVideoRecording.stop().then(() => { // 下载到本地 myVideoRecording.download(); // 本地播放url myVideoRecording.viewRecording().then((srcObject) => {}); // 转file可上传到后台服务器 myVideoRecording.toFile().then((file) => {}); }); });