大家好，我尝试在我的 reactJS 应用程序中实现 getUserMedia 来录制音频。
我努力将我的 mediaRecorder this.state 对象链接到状态更改，并使媒体设备 API 获得我提供应用程序所需的功能。
当我在 View 上单击“开始记录”时，我的控制台返回给我:
TypeError: this.state.mediaRecorder.start is not a function
48 | startRecord() {
49 |
50 |
51 | this.setState({mediaRecorder:this.state.mediaRecorder.start()});
52 | alert("start record function started =, mediaRecorder state : " + this.state.mediaRecorder.state)
53 | console.log(this.state.mediaRecorder.state); // > recording
54 | console.log("recorder started"); View compiled
import React from "react";
// import "./install.js" ;
import "./mediaDevices-getUserMedia-polyfill.js";
class RecorderAPI extends React.Component {
constructor(props) {
super(props);
this.handleDelete = this.handleDelete.bind(this);
this.startRecord = this.startRecord.bind(this);
this.stopRecord = this.stopRecord.bind(this);
this.recordOnStop = this.recordOnStop.bind(this);
this.state = {
mediaRecorder : [],
audioURL : []
}
}
componentDidMount() {
if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
console.log('getUserMedia supported');
// target
navigator.mediaDevices.getUserMedia( {audio: true })
/***** success callback ******/
// create a media stream
.then(function (stream) {
//if callback succeed, the following code will run :
// create a new Media Recorder instance
// with MediaRecorder() constructor
// this instance is the entry point
// into using the MediaRecorder API
stream = new MediaRecorder(stream);
this.setState({ mediaRecorder: stream });
})/***** error callback *****/
.catch(function (err) {
console.log("error : " + err)
});
}
else {
console.log("getUserMedia : missing")
}
}
// launch mediaRecorder.start methods the stream
// when the record button is pressed:
startRecord() {
this.setState({mediaRecorder: this.state.mediaRecorder.start()});
alert("start record function started =, mediaRecorder state : " + this.state.mediaRecorder.state)
console.log( this.state.mediaRecorder.state); // > recording
console.log("recorder started");
// As recording progresses we
// collect the audio data via an event handler
var chunks = []; // we set a container
this.setState({mediaRecorder: this.state.mediaRecorder.ondataavailable = function (e) {
chunks.push(e.data);
}
});
}
// e MediaRecorder.stop() method
// to stop the recording when the stop button is pressed
stopRecord() {
// callback for onStop function
this.recordOnStop();
console.log( this.state.mediaRecorder.state);
console.log("recorder stopped");
}
/***** Grabbing and using the blob *****/
// stop event finalize our blob there
// from all the chunks we have received:
recordOnStop() { // event handler stop of recording
console.log("recorder stopped");
var blob = new Blob(this.chunks, { 'type': "audio/ogg ; codecs=opus" })
this.chunks = [];
// creates a DOMString containing a URL representing
// the object given in the parameter
this.setState({ audioURL: window.URL.createObjectURL(blob)})
}
handleDelete(e) {
var evtTgt = e.target;
evtTgt.parentNode.parentNode.removeChild(evtTgt.parentNode);
}
render() {
return (
<div>
<button className="dashboard">
Dashboard</button>
<span className="controlsBar">
<button onClick={this.startRecord} className="start">
Start recording
</button>
<button onClick={this.stopRecord} className="stop">
Stop recording</button>
<button onClick={this.deleteRecord} className="delete">
Delete recording
</button>
</span>
</div>
)
}
}
export default RecorderAPI;
最佳答案
这里是我对我的问题的解决方案:
/* eslint-env browser */
import React from 'react';
import Bird from "./sounds/birds.mp3"
const audioType = 'audio/*';
class RecordingAPI extends React.Component {
constructor(props) {
super(props);
this.state = {
recording: false,
audios: [],
};
}
async componentDidMount() {
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
// show it to user
this.audio.src = window.URL.createObjectURL(stream);
this.audio.play();
// init recording
this.mediaRecorder = new MediaRecorder(stream);
// init data storage for video chunks
this.chunks = [];
// listen for data from media recorder
this.mediaRecorder.ondataavailable = e => {
if (e.data && e.data.size > 0) {
this.chunks.push(e.data);
}
};
}
startRecording(e) {
e.preventDefault();
// wipe old data chunks
this.chunks = [];
// start recorder with 10ms buffer
this.mediaRecorder.start(10);
// say that we're recording
this.setState({recording: true});
}
stopRecording(e) {
e.preventDefault();
// stop the recorder
this.mediaRecorder.stop();
// say that we're not recording
this.setState({recording: false});
// save the video to memory
this.saveAudio();
}
saveAudio() {
// convert saved chunks to blob
const blob = new Blob(this.chunks, {type: audioType});
// generate video url from blob
const audioURL = window.URL.createObjectURL(blob);
// append videoURL to list of saved videos for rendering
const audios = this.state.audios.concat([audioURL]);
this.setState({audios});
}
deleteAudio(audioURL) {
// filter out current videoURL from the list of saved videos
const audios = this.state.audios.filter(a => a !== audioURL);
this.setState({audios});
}
render() {
const {recording, audios} = this.state;
return (
<div className="camera">
<audio
style={{width: 400}}
ref={a => {
this.audio = a;
}}>
<p>Audio stream not available. </p>
</audio>
<div>
{!recording && <button onClick={e => this.startRecording(e)}>Record</button>}
{recording && <button onClick={e => this.stopRecording(e)}>Stop</button>}
</div>
<div>
<h3>Recorded audios:</h3>
{audios.map((audioURL, i) => (
<div key={`audio_${i}`}>
<audio controls style={{width: 200}} src={audioURL} />
<div>
<button onClick={() => this.deleteAudio(audioURL)}>Delete</button>
</div>
</div>
))}
</div>
</div>
);
}
}
export default RecordingAPI
关于reactjs - 在 reactJS 中使用 getusermedia 媒体设备录制音频，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50431236/