Function getDisplayStream

apps/chrome-extension/src/offscreen/recorder.ts:416–464

(
	mode: Exclude<RecordingMode, "tab" | "camera">,
	includeAudio: boolean,
)

	navigator.mediaDevices.getDisplayMedia(options as DisplayMediaStreamOptions);

const getDisplayStream = async (
	mode: Exclude<RecordingMode, "tab" | "camera">,
	includeAudio: boolean,
) => {
	const preferences = DISPLAY_MODE_PREFERENCES[mode];
	const video = DISPLAY_MEDIA_VIDEO_CONSTRAINTS;

	try {
		return await requestDisplayMedia({
			...preferences,
			video,
			audio: includeAudio,
		});
	} catch (error) {
		if (isUserCancellationError(error)) throw error;

		// Some browsers/OSes reject the advanced surface preferences
		// (monitorTypeSurfaces, surfaceSwitching, preferCurrentTab, …) or a
		// system-audio request the picker cannot satisfy. Fall back the way the
		// dashboard recorder does instead of failing the whole capture.
		if (shouldRetryDisplayMediaWithoutPreferences(error)) {
			try {
				return await requestDisplayMedia({ video, audio: includeAudio });
			} catch (retryError) {
				if (
					includeAudio &&
					shouldRetryDisplayMediaWithoutPreferences(retryError)
				) {
					return requestDisplayMedia({ video, audio: false });
				}
				throw retryError;
			}
		}

		if (includeAudio) {
			try {
				return await requestDisplayMedia({
					...preferences,
					video,
					audio: false,
				});
			} catch {
				throw error;
			}
		}

		throw error;
	}
};

const getMainStream = async (request: StartRecordingRequest) => {
	if (request.mode === "tab") {