RQ25rFJv

1(node:13704) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead. 
2     
3const {desktopCapturer} = require('electron');
4const fs = require('graceful-fs');
5
6const SECRET_KEY = 'Electron 69';
7let recorder;
8let blobs = [];
9
10const startRecording = () => {
11    let title = document.title;
12    document.title = SECRET_KEY;
13
14    desktopCapturer.getSources({types: ['window', 'screen']}, (error, sources) => {
15        if (error) throw error;
16        for (let source of sources) {
17            if (source.name === SECRET_KEY) {
18                document.title = title;
19
20                navigator.mediaDevices.getUserMedia({
21                    audio: false,
22                    video: {
23                        mandatory: {
24                            chromeMediaSource: 'desktop',
25                            chromeMediaSourceId: source.id,
26                            minWidth: 1280,
27                            maxWidth: 1280,
28                            minHeight: 720,
29                            maxHeight: 720
30                        }
31                    }
32                }).then((stream) => handleStream(stream))
33                    .catch((e) => handleError(e));
34                return
35            }
36        }
37    });
38};
39
40function handleStream(stream) {
41    recorder = new MediaRecorder(stream);
42    blobs = [];
43    recorder.ondataavailable = function(event) {
44        blobs.push(event.data);
45    };
46    recorder.start();
47}
48
49function stopRecording() {
50    recorder.stop();
51    toArrayBuffer(new Blob(blobs, {type: 'video/mp4'}), function(ab) {
52        const buffer = toBuffer(ab);
53        const file = `./record.mp4`;
54        fs.writeFile(file, buffer, function(err) {
55            if (err) {
56                console.error('Failed to save video ' + err);
57            } else {
58                console.log('Saved video: ' + file);
59            }
60        });
61    });
62}
63
64function handleError(e) {
65    console.error('handleUserMediaError', e);
66}
67
68function toArrayBuffer(blob, cb) {
69    let fileReader = new FileReader();
70    fileReader.onload = function() {
71        let arrayBuffer = this.result;
72        cb(arrayBuffer);
73    };
74    fileReader.readAsArrayBuffer(blob);
75}
76
77function toBuffer(ab) {
78    let buffer = new Buffer(ab.byteLength);
79    let arr = new Uint8Array(ab);
80    for (let i = 0; i < arr.byteLength; i++) {
81        buffer[i] = arr[i];
82    }
83    return buffer;
84}
85
86// Record for 3 seconds and save to disk
87startRecording();
88setTimeout(function() { stopRecording() }, 3000);