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import { BrowserHelper } from "./browserHelper";
import { Camera } from "./camera";
import { UnsupportedBrowserError } from "./unsupportedBrowserError";
/**
* A helper object to interact with cameras.
*/
export namespace CameraAccess {
/**
* @hidden
*
* Handle localized camera labels. Supported languages:
* English, German, French, Spanish (spain), Portuguese (brasil), Portuguese (portugal), Italian,
* Chinese (simplified), Chinese (traditional), Japanese, Russian, Turkish, Dutch, Arabic, Thai, Swedish,
* Danish, Vietnamese, Norwegian, Polish, Finnish, Indonesian, Hebrew, Greek, Romanian, Hungarian, Czech,
* Catalan, Slovak, Ukraininan, Croatian, Malay, Hindi.
*/
const backCameraKeywords: string[] = [
"rear",
"back",
"rück",
"arrière",
"trasera",
"trás",
"traseira",
"posteriore",
"后面",
"後面",
"背面",
"后置", // alternative
"後置", // alternative
"背置", // alternative
"задней",
"الخلفية",
"후",
"arka",
"achterzijde",
"หลัง",
"baksidan",
"bagside",
"sau",
"bak",
"tylny",
"takakamera",
"belakang",
"אחורית",
"πίσω",
"spate",
"hátsó",
"zadní",
"darrere",
"zadná",
"задня",
"stražnja",
"belakang",
"बैक",
];
/**
* @hidden
*/
const cameraObjects: Map<string, Camera> = new Map<string, Camera>();
/**
* @hidden
*/
const inaccessibleCameras: Set<string> = new Set<string>();
/**
* @hidden
*/
let getCamerasPromise: Promise<Camera[]> | undefined;
/**
* @hidden
*
* @param label The camera label.
* @returns Whether the label mentions the camera being a back-facing one.
*/
function isBackCameraLabel(label: string): boolean {
const lowercaseLabel: string = label.toLowerCase();
return backCameraKeywords.some((keyword) => {
return lowercaseLabel.includes(keyword);
});
}
/**
* @hidden
*
* Map non-standard error names to standard ones.
*
* @param error The error object.
*/
function mapNonStandardErrorName(error: Error): void {
let name: string = error.name;
// istanbul ignore next
switch (name) {
case "DeviceCaptureError":
case "ScreenCaptureError":
case "TabCaptureError":
name = "AbortError";
break;
case "InvalidStateError":
case "MediaDeviceFailedDueToShutdown":
case "MediaDeviceKillSwitchOn":
case "PermissionDeniedError":
case "PermissionDismissedError":
name = "NotAllowedError";
break;
case "DevicesNotFoundError":
name = "NotFoundError";
break;
case "SourceUnavailableError":
case "TrackStartError":
name = "NotReadableError";
break;
case "ConstraintNotSatisfiedError":
name = "OverconstrainedError";
break;
default:
return;
}
Object.defineProperty(error, "name", {
value: name,
});
}
/**
* @hidden
*
* @param cameras The array of available [[Camera]] objects.
* @param activeCamera The current active [[Camera]] object.
* @param activeCameraIsBackFacing Whether *activeCamera* is facing back (environment).
*/
function adjustCameraTypes(cameras: Camera[], activeCamera: Camera, activeCameraIsBackFacing: boolean): void {
// TODO: improve logic for possible multiple front/back cameras
if (activeCameraIsBackFacing) {
// Correct camera types if needed
cameras.forEach((camera) => {
if (camera.deviceId === activeCamera.deviceId) {
// tslint:disable-next-line:no-any
(<any>camera).cameraType = Camera.Type.BACK;
} else if (!isBackCameraLabel(camera.label)) {
// tslint:disable-next-line:no-any
(<any>camera).cameraType = Camera.Type.FRONT;
}
});
} else {
// tslint:disable-next-line:no-any
(<any>activeCamera).cameraType = Camera.Type.FRONT;
}
}
/**
* @hidden
*
* Adjusts the cameras' type classification based on the given currently active video stream:
* If the stream comes from an environment-facing camera, the camera is marked to be a back-facing camera
* and the other cameras to be of other types accordingly (if they are not correctly set already).
*
* The method returns the currently active camera if it's actually the correct (main with wanted type or only) one.
*
* @param mediaStreamTrack The currently active `MediaStreamTrack`.
* @param cameras The array of available [[Camera]] objects.
* @param wantedCameraType The wanted camera type.
* @returns The active [[Camera]] object if the stream is actually from the correct camera.
*/
export function adjustCamerasFromCameraStream(
mediaStreamTrack: MediaStreamTrack,
cameras: Camera[],
wantedCameraType: Camera.Type
): Camera | undefined {
let mediaTrackSettings: MediaTrackSettings | undefined;
if (typeof mediaStreamTrack.getSettings === "function") {
mediaTrackSettings = mediaStreamTrack.getSettings();
}
const activeCamera: Camera | undefined = cameras.find((camera) => {
return camera.deviceId === mediaTrackSettings?.deviceId || camera.label === mediaStreamTrack.label;
});
if (activeCamera != null) {
adjustCameraTypes(
cameras,
activeCamera,
mediaTrackSettings?.facingMode === "environment" || isBackCameraLabel(mediaStreamTrack.label)
);
const mainCameraForType: Camera | undefined = cameras
.filter((camera) => {
return camera.cameraType === wantedCameraType;
})
.sort((camera1, camera2) => {
return camera1.label.localeCompare(camera2.label);
})[0];
if (cameras.length === 1 || activeCamera.deviceId === mainCameraForType?.deviceId) {
return activeCamera;
}
}
return undefined;
}
/**
* @hidden
*
* @param devices The list of available devices.
* @returns The extracted list of accessible camera objects initialized from the given devices.
*/
function extractAccessibleCamerasFromDevices(devices: MediaDeviceInfo[]): Camera[] {
const cameras: Camera[] = devices
.filter((device) => {
return device.kind === "videoinput";
})
.filter((videoDevice) => {
// Ignore infrared cameras as they often fail to be accessed and are not useful in any case
return !/\b(?:ir|infrared)\b/i.test(videoDevice.label);
})
.filter((videoDevice) => {
return !inaccessibleCameras.has(videoDevice.deviceId);
})
.map((videoDevice) => {
if (cameraObjects.has(videoDevice.deviceId)) {
return <Camera>cameraObjects.get(videoDevice.deviceId);
}
const label: string = videoDevice.label ?? "";
const camera: Camera = {
deviceId: videoDevice.deviceId,
label,
cameraType: isBackCameraLabel(label) ? Camera.Type.BACK : Camera.Type.FRONT,
};
if (label !== "") {
cameraObjects.set(videoDevice.deviceId, camera);
}
return camera;
});
if (
cameras.length > 1 &&
!cameras.some((camera) => {
return camera.cameraType === Camera.Type.BACK;
})
) {
// Check if cameras are labeled with resolution information, take the higher-resolution one in that case
// Otherwise pick the last camera
let backCameraIndex: number = cameras.length - 1;
const cameraResolutions: number[] = cameras.map((camera) => {
const match: RegExpMatchArray | null = camera.label.match(/\b([0-9]+)MP?\b/i);
if (match != null) {
return parseInt(match[1], 10);
}
return NaN;
});
if (
!cameraResolutions.some((cameraResolution) => {
return isNaN(cameraResolution);
})
) {
backCameraIndex = cameraResolutions.lastIndexOf(Math.max(...cameraResolutions));
}
// tslint:disable-next-line:no-any
(<any>cameras[backCameraIndex]).cameraType = Camera.Type.BACK;
}
return cameras;
}
/**
* Get a list of cameras (if any) available on the device, a camera access permission is requested to the user
* the first time this method is called if needed.
*
* Depending on device features and user permissions for camera access, any of the following errors
* could be the rejected result of the returned promise:
* - `AbortError`
* - `NotAllowedError`
* - `NotFoundError`
* - `NotReadableError`
* - `SecurityError`
* - `UnsupportedBrowserError`
*
* @returns A promise resolving to the array of available [[Camera]] objects (could be empty).
*/
export function getCameras(): Promise<Camera[]> {
if (getCamerasPromise != null) {
return getCamerasPromise;
}
const browserCompatibility: BrowserCompatibility = BrowserHelper.checkBrowserCompatibility();
if (!browserCompatibility.fullSupport) {
return Promise.reject(new UnsupportedBrowserError(browserCompatibility));
}
const accessPermissionPromise: Promise<null | MediaStream> = new Promise((resolve, reject) => {
return enumerateDevices()
.then((devices) => {
if (
devices
.filter((device) => {
return device.kind === "videoinput";
})
.every((device) => {
return device.label === "";
})
) {
resolve(
navigator.mediaDevices.getUserMedia({
video: true,
audio: false,
})
);
} else {
resolve(null);
}
})
.catch(reject);
});
getCamerasPromise = new Promise(async (resolve, reject) => {
let stream!: MediaStream | null;
try {
stream = await accessPermissionPromise;
const devices: MediaDeviceInfo[] = await enumerateDevices();
const cameras: Camera[] = extractAccessibleCamerasFromDevices(devices);
console.debug("Camera list: ", ...cameras);
return resolve(cameras);
} catch (error) {
mapNonStandardErrorName(error);
reject(error);
} finally {
stream?.getVideoTracks().forEach((track) => {
track.stop();
});
getCamerasPromise = undefined;
}
});
return getCamerasPromise;
}
/**
* @hidden
*
* Call `navigator.mediaDevices.getUserMedia` asynchronously in a `setTimeout` call.
*
* @param getUserMediaParams The parameters for the `navigator.mediaDevices.getUserMedia` call.
* @returns A promise resolving when the camera is accessed.
*/
function getUserMediaDelayed(getUserMediaParams: MediaStreamConstraints): Promise<MediaStream> {
console.debug("Camera access:", getUserMediaParams.video);
return new Promise((resolve, reject) => {
window.setTimeout(() => {
navigator.mediaDevices.getUserMedia(getUserMediaParams).then(resolve).catch(reject);
}, 0);
});
}
/**
* @hidden
*
* Get the *getUserMedia* *video* parameters to be used given a resolution fallback level and the browser used.
*
* @param resolutionFallbackLevel The number representing the wanted resolution, from 0 to 4,
* resulting in higher to lower video resolutions.
* @returns The resulting *getUserMedia* *video* parameters.
*/
function getUserMediaVideoParams(resolutionFallbackLevel: number): MediaTrackConstraints {
const userMediaVideoParams: MediaTrackConstraints = {
resizeMode: "none",
};
switch (resolutionFallbackLevel) {
case 0:
return {
...userMediaVideoParams,
width: { min: 3200, ideal: 3840, max: 4096 },
height: { min: 1800, ideal: 2160, max: 2400 },
};
case 1:
return {
...userMediaVideoParams,
width: { min: 1400, ideal: 1920, max: 2160 },
height: { min: 900, ideal: 1080, max: 1440 },
};
case 2:
return {
...userMediaVideoParams,
width: { min: 960, ideal: 1280, max: 1440 },
height: { min: 480, ideal: 720, max: 960 },
};
case 3:
return {
...userMediaVideoParams,
width: { min: 640, ideal: 640, max: 800 },
height: { min: 480, ideal: 480, max: 600 },
};
default:
return {};
}
}
/**
* @hidden
*
* Try to access a given camera for video input at the given resolution level.
*
* If a camera is inaccessible because of unknown issues, then it's added to the device blacklist.
*
* @param resolutionFallbackLevel The number representing the wanted resolution, from 0 to 4,
* resulting in higher to lower video resolutions.
* @param camera The camera to try to access for video input.
* @returns A promise resolving to the `MediaStream` object coming from the accessed camera.
*/
export function accessCameraStream(resolutionFallbackLevel: number, camera: Camera): Promise<MediaStream> {
const getUserMediaParams: MediaStreamConstraints = {
audio: false,
video: getUserMediaVideoParams(resolutionFallbackLevel),
};
if (camera.deviceId === "") {
(<MediaTrackConstraints>getUserMediaParams.video).facingMode = {
ideal: camera.cameraType === Camera.Type.BACK ? "environment" : "user",
};
} else {
(<MediaTrackConstraints>getUserMediaParams.video).deviceId = {
exact: camera.deviceId,
};
}
return getUserMediaDelayed(getUserMediaParams).catch((error) => {
mapNonStandardErrorName(error);
if (camera.deviceId !== "" && (error.name !== "OverconstrainedError" || resolutionFallbackLevel === 4)) {
inaccessibleCameras.add(camera.deviceId);
cameraObjects.delete(camera.deviceId);
}
throw error;
});
}
/**
* @hidden
*
* Get a list of available devices in a cross-browser compatible way.
*
* @returns A promise resolving to the `MediaDeviceInfo` array of all available devices.
*/
function enumerateDevices(): Promise<MediaDeviceInfo[]> {
if (typeof navigator.enumerateDevices === "function") {
return navigator.enumerateDevices();
} else if (
typeof navigator.mediaDevices === "object" &&
typeof navigator.mediaDevices.enumerateDevices === "function"
) {
return navigator.mediaDevices.enumerateDevices();
} else {
return new Promise((resolve, reject) => {
try {
if (window.MediaStreamTrack?.getSources == null) {
throw new Error();
}
window.MediaStreamTrack.getSources((devices) => {
resolve(
devices
.filter((device) => {
return device.kind.toLowerCase() === "video" || device.kind.toLowerCase() === "videoinput";
})
.map((device) => {
return {
deviceId: device.deviceId ?? "",
groupId: device.groupId,
kind: <MediaDeviceKind>"videoinput",
label: device.label,
toJSON: /* istanbul ignore next */ function (): MediaDeviceInfo {
return this;
},
};
})
);
});
} catch {
const browserCompatibility: BrowserCompatibility = {
fullSupport: false,
scannerSupport: true,
missingFeatures: [BrowserCompatibility.Feature.MEDIA_DEVICES],
};
return reject(new UnsupportedBrowserError(browserCompatibility));
}
});
}
}
}
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