如何解决使MediaRecorder在Angular 9中工作的问题
我正在尝试在Angular 9应用中实现Media Recorder https://developers.google.com/web/updates/2016/01/mediarecorder,但是问题很少。
当我打开带有Media Recorder组件的页面时,由于相机上的指示灯亮起,因此检测到了相机,但这就是我在下面看到的全部内容:
所有按钮均无效,我不确定为什么。
这是我的控制台日志:
请参阅我的mediarecorder.ts组件
/// <reference types="@types/dom-mediacapture-record" />
import { Component,OnInit,AfterViewInit } from '@angular/core';
import {PatientsService} from '../patients.service';
// declare var MediaRecorder:any;
@Component({
selector: 'app-mediarecord',templateUrl: './mediarecord.component.html',styleUrls: ['./mediarecord.component.scss']
})
export class MediarecordComponent implements AfterViewInit,OnInit {
constraints; video; mediaRecorder; options;
private recordedChunks: any[] = [];
streams: string[] = [];
audioChunks: any[];
videoChunks: any[];
constructor(private signalHub: PatientsService)
{
this.constraints = { audio: true,video: true };
}
ngOnInit() {
// const video = document.createElement('video');
// this.video = document.getElementsByClassName('video')[0];
// console.log(this.video);
}
ngAfterViewInit() {
this.runMedia();
}
successCallback(stream) {
if (MediaRecorder.isTypeSupported('video/webm;codecs=vp9')) {
this.options = { mimeType: 'video/webm; codecs=vp9' };
console.log("Oh no");
} else if (MediaRecorder.isTypeSupported('video/webm;codecs=vp8')) {
this.options = { mimeType: 'video/webm; codecs=vp8' };
} else {
// ...
}
// this.video.srcObject = stream;
// console.log(stream);
// this.video.srcObject = stream;
// console.log(stream.srcObject);
// this.video.play();
this.mediaRecorder = new MediaRecorder(stream,this.options);
console.log(this.mediaRecorder);
console.log(this.options);
this.mediaRecorder.ondataavailable = this.handleDataAvailable;
this.mediaRecorder.start();
console.log(this.mediaRecorder);
console.log("oo");
}
stopVideo() {
this.mediaRecorder.stop();
}
handleDataAvailable(blob) {
// POST/PUT "Blob" using FormData/XHR2
console.log(blob);
//this.signalHub.sendStream(blob);
this.recordedChunks.push(blob.data);
}
errorCallback(error) {
console.log('navigator.getUserMedia error: ',error);
}
runMedia() {
this.streams.push("f");
console.log(this.constraints);
navigator.mediaDevices.getUserMedia(this.constraints)
.then((stream) => {
console.log(stream);
this.successCallback(stream);
})
.catch(this.errorCallback);
}
}
HTML文件-我知道我需要将其与ts绑定的方法
<video id="Recording" width="800" height="400" playsinline autoplay ></video>
<div>
<button id="start" (click) = "ngAfterViewInit()" >Start camera</button>
<button id="record" >Start Recording</button>
<button id="play" >Play</button>
<button id="download">Download</button>
</div>
<div>
<h4>Media Stream Constraints options</h4>
<p>Echo cancellation: <input type="checkbox" id="echoCancellation"></p>
</div>
<div>
<span id="errorMsg"></span>
</div>
index.d.ts文件:
// Type definitions for non-npm package w3c MediaStream Recording 1.0
// Project: https://w3c.github.io/mediacapture-record
// Definitions by: Elias Meire <https://github.com/elsmr>
// AppLover69 <https://github.com/AppLover69>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
interface MediaRecorderErrorEventInit extends EventInit {
error: DOMException;
}
declare class MediaRecorderErrorEvent extends Event {
constructor(type: string,eventInitDict: MediaRecorderErrorEventInit);
readonly error: DOMException;
}
interface BlobEventInit extends EventInit {
data: Blob;
timecode?: number;
}
declare class BlobEvent extends Event {
constructor(type: string,eventInitDict: BlobEventInit);
readonly data: Blob;
readonly timecode: number;
}
type BitrateMode = 'vbr' | 'cbr';
interface MediaRecorderOptions {
mimeType?: string;
audioBitsPerSecond?: number;
videoBitsPerSecond?: number;
bitsPerSecond?: number;
audioBitrateMode?: BitrateMode;
}
type RecordingState = 'inactive' | 'recording' | 'paused';
interface MediaRecorderEventMap {
"dataavailable": BlobEvent;
"error": MediaRecorderErrorEvent;
"pause": Event;
"resume": Event;
"start": Event;
"stop": Event;
}
declare class MediaRecorder extends EventTarget {
readonly stream: MediaStream;
readonly mimeType: string;
readonly state: RecordingState;
readonly videoBitsPerSecond: number;
readonly audioBitsPerSecond: number;
readonly audioBitrateMode: BitrateMode;
ondataavailable: ((event: BlobEvent) => void) | null;
onerror: ((event: MediaRecorderErrorEvent) => void) | null;
onpause: EventListener | null;
onresume: EventListener | null;
onstart: EventListener | null;
onstop: EventListener | null;
constructor(stream: MediaStream,options?: MediaRecorderOptions);
addEventListener<K extends keyof MediaRecorderEventMap>(type: K,listener: (this: MediaRecorder,ev: MediaRecorderEventMap[K]) => any,options?: boolean | AddEventListenerOptions): void;
addEventListener(type: string,listener: EventListenerOrEventListenerObject,options?: boolean | AddEventListenerOptions): void;
removeEventListener<K extends keyof MediaRecorderEventMap>(type: K,options?: boolean | EventListenerOptions): void;
removeEventListener(type: string,options?: boolean | EventListenerOptions): void;
start(timeslice?: number): void;
stop(): void;
resume(): void;
pause(): void;
requestData(): void;
static isTypeSupported(type: string): boolean;
}
interface Window {
MediaRecorder: typeof MediaRecorder;
BlobEvent: typeof BlobEvent;
MediaRecorderErrorEvent: typeof MediaRecorderErrorEvent;
}
我还有一个lib.dom.ts文件,该文件是通过运行npm install @ types / dom-mediacapture-record获得的
解决方法
如果要在单击“开始”时运行“ runMedia()”方法,则直接从html调用它,而不是调用“ ngAfterViewInit()”钩子。
<video id="Recording" width="800" height="400" playsinline autoplay ></video>
<div>
<button id="start" (click)="runMedia()">Start camera</button>
<button id="record">Start Recording</button> // call record method
<button id="play">Play</button> // call play method
<button id="download">Download</button> // call download method
</div>
<div>
<h4>Media Stream Constraints options</h4>
<p>Echo cancellation: <input type="checkbox" id="echoCancellation"></p>
</div>
<div>
<span id="errorMsg"></span>
</div>
这样,您应该至少可以通过单击开始按钮来运行“ runMedia()”方法。 如果您可以使用代码创建一个plucker或stackblitz,则更容易理解整个问题。
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