114 lines
3 KiB
TypeScript
114 lines
3 KiB
TypeScript
const FILE_TYPE = 'video/webm';
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const FRAME_RATE = 30;
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function createFileRecorder(
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stream: MediaStream,
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mimeType: string,
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recName: string,
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sessionId: string,
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saveCb: Function
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) {
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let ended = false;
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const start = new Date().getTime();
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let recordedChunks: BlobPart[] = [];
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const SAVE_INTERVAL_MS = 200;
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const mediaRecorder = new MediaRecorder(stream);
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mediaRecorder.ondataavailable = function (e) {
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if (e.data.size > 0) {
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recordedChunks.push(e.data);
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}
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};
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function onEnd() {
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if (ended) return;
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ended = true;
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saveFile(recordedChunks, mimeType, start, recName, sessionId, saveCb);
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recordedChunks = [];
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}
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// sometimes we get race condition or the onstop won't trigger at all,
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// this is why we have to make it twice to make sure that stream is saved
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// plus we want to be able to handle both, native and custom button clicks
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mediaRecorder.stream.getTracks().forEach((track) => (track.onended = onEnd));
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mediaRecorder.onstop = () => {
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onEnd();
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mediaRecorder.stream.getTracks().forEach((track) => track.stop());
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};
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mediaRecorder.start(SAVE_INTERVAL_MS);
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return mediaRecorder;
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}
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function saveFile(
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recordedChunks: BlobPart[],
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mimeType: string,
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startDate: number,
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recName: string,
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sessionId: string,
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saveCb: Function
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) {
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const saveObject = { name: recName, duration: new Date().getTime() - startDate, sessionId };
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const blob = new Blob(recordedChunks, {
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type: mimeType,
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});
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saveCb(saveObject, blob);
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const filename = recName + '.' + mimeType.split('/')[1];
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const downloadLink = document.createElement('a');
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downloadLink.href = URL.createObjectURL(blob);
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downloadLink.download = filename;
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document.body.appendChild(downloadLink);
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downloadLink.click();
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URL.revokeObjectURL(downloadLink.href); // clear from memory
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document.body.removeChild(downloadLink);
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}
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async function recordScreen() {
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return await navigator.mediaDevices.getDisplayMedia({
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audio: true,
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video: { frameRate: FRAME_RATE },
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// potential chrome hack
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// @ts-ignore
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preferCurrentTab: true,
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});
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}
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/**
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* Creates a screen recorder that sends the media stream to MediaRecorder
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* which then saves the stream to a file.
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*
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* Supported Browsers:
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*
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* Windows: Chrome v91+, Edge v90+ - FULL SUPPORT;
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* *Nix: Chrome v91+, Edge v90+ - LIMITED SUPPORT - (audio only captured from current tab)
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*
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* @returns a promise that resolves to a function that stops the recording
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*/
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export async function screenRecorder(recName: string, sessionId: string, saveCb: Function) {
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try {
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const stream = await recordScreen();
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const mediaRecorder = createFileRecorder(stream, FILE_TYPE, recName, sessionId, saveCb);
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return () => {
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if (mediaRecorder.state !== 'inactive') {
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mediaRecorder.stop();
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}
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}
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} catch (e) {
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console.log(e);
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}
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}
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// @ts-ignore
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window.recordSceenSample = screenRecorder;
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// NOT SUPPORTED:
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// macOS: chrome and edge only support capturing current tab's audio
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// windows: chrome and edge supports all audio
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// other: not supported
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