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eslint-env browser */\nimport invariant from 'invariant';\n\nimport {\n CameraType,\n CameraCapturedPicture,\n ImageSize,\n ImageType,\n WebCameraSettings,\n CameraPictureOptions,\n} from './Camera.types';\nimport * as CapabilityUtils from './WebCapabilityUtils';\nimport { CameraTypeToFacingMode, ImageTypeFormat, MinimumConstraints } from './WebConstants';\nimport { requestUserMediaAsync } from './WebUserMediaManager';\n\ninterface ConstrainLongRange {\n max?: number;\n min?: number;\n exact?: number;\n ideal?: number;\n}\n\nexport function getImageSize(videoWidth: number, videoHeight: number, scale: number): ImageSize {\n const width = videoWidth * scale;\n const ratio = videoWidth / width;\n const height = videoHeight / ratio;\n\n return {\n width,\n height,\n };\n}\n\nexport function toDataURL(\n canvas: HTMLCanvasElement,\n imageType: ImageType,\n quality: number\n): string {\n invariant(\n Object.values(ImageType).includes(imageType),\n `expo-camera: ${imageType} is not a valid ImageType. Expected a string from: ${Object.values(\n ImageType\n ).join(', ')}`\n );\n\n const format = ImageTypeFormat[imageType];\n if (imageType === ImageType.jpg) {\n invariant(\n quality <= 1 && quality >= 0,\n `expo-camera: ${quality} is not a valid image quality. Expected a number from 0...1`\n );\n return canvas.toDataURL(format, quality);\n } else {\n return canvas.toDataURL(format);\n }\n}\n\nexport function hasValidConstraints(\n preferredCameraType?: CameraType,\n width?: number | ConstrainLongRange,\n height?: number | ConstrainLongRange\n): boolean {\n return preferredCameraType !== undefined && width !== undefined && height !== undefined;\n}\n\nfunction ensureCameraPictureOptions(config: CameraPictureOptions): CameraPictureOptions {\n const captureOptions = {\n scale: 1,\n imageType: ImageType.png,\n isImageMirror: false,\n };\n\n for (const key in config) {\n if (key in config && config[key] !== undefined && key in captureOptions) {\n captureOptions[key] = config[key];\n }\n }\n return captureOptions;\n}\n\nconst DEFAULT_QUALITY = 0.92;\n\nexport function captureImageData(\n video: HTMLVideoElement | null,\n pictureOptions: Pick = {}\n): ImageData | null {\n if (!video || video.readyState !== video.HAVE_ENOUGH_DATA) {\n return null;\n }\n const canvas = captureImageContext(video, pictureOptions);\n\n const context = canvas.getContext('2d', { alpha: false });\n if (!context || !canvas.width || !canvas.height) {\n return null;\n }\n\n const imageData = context.getImageData(0, 0, canvas.width, canvas.height);\n return imageData;\n}\n\nexport function captureImageContext(\n video: HTMLVideoElement,\n { scale = 1, isImageMirror = false }: Pick\n): HTMLCanvasElement {\n const { videoWidth, videoHeight } = video;\n const { width, height } = getImageSize(videoWidth, videoHeight, scale!);\n\n // Build the canvas size and draw the camera image to the context from video\n const canvas = document.createElement('canvas');\n canvas.width = width;\n canvas.height = height;\n const context = canvas.getContext('2d', { alpha: false });\n\n if (!context) {\n // Should never be called\n throw new Error('Context is not defined');\n }\n // sharp image details\n // context.imageSmoothingEnabled = false;\n\n // Flip horizontally (as css transform: rotateY(180deg))\n if (isImageMirror) {\n context.setTransform(-1, 0, 0, 1, canvas.width, 0);\n }\n\n context.drawImage(video, 0, 0, width, height);\n\n return canvas;\n}\n\nexport function captureImage(\n video: HTMLVideoElement,\n pictureOptions: CameraPictureOptions\n): string {\n const config = ensureCameraPictureOptions(pictureOptions);\n const canvas = captureImageContext(video, config);\n const { imageType, quality = DEFAULT_QUALITY } = config;\n return toDataURL(canvas, imageType!, quality);\n}\n\nfunction getSupportedConstraints(): MediaTrackSupportedConstraints | null {\n if (navigator.mediaDevices && navigator.mediaDevices.getSupportedConstraints) {\n return navigator.mediaDevices.getSupportedConstraints();\n }\n return null;\n}\n\nexport function getIdealConstraints(\n preferredCameraType: CameraType,\n width?: number | ConstrainLongRange,\n height?: number | ConstrainLongRange\n): MediaStreamConstraints {\n const preferredConstraints: MediaStreamConstraints = {\n audio: false,\n video: {},\n };\n\n if (hasValidConstraints(preferredCameraType, width, height)) {\n return MinimumConstraints;\n }\n\n const supports = getSupportedConstraints();\n // TODO(Bacon): Test this\n if (!supports || !supports.facingMode || !supports.width || !supports.height) {\n return MinimumConstraints;\n }\n\n if (preferredCameraType && Object.values(CameraType).includes(preferredCameraType)) {\n const facingMode = CameraTypeToFacingMode[preferredCameraType];\n if (isWebKit()) {\n const key = facingMode === 'user' ? 'exact' : 'ideal';\n (preferredConstraints.video as MediaTrackConstraints).facingMode = {\n [key]: facingMode,\n };\n } else {\n (preferredConstraints.video as MediaTrackConstraints).facingMode = {\n ideal: CameraTypeToFacingMode[preferredCameraType],\n };\n }\n }\n\n if (isMediaTrackConstraints(preferredConstraints.video)) {\n preferredConstraints.video.width = width;\n preferredConstraints.video.height = height;\n }\n\n return preferredConstraints;\n}\n\nfunction isMediaTrackConstraints(input: any): input is MediaTrackConstraints {\n return input && typeof input.video !== 'boolean';\n}\n\n/**\n * Invoke getStreamDevice a second time with the opposing camera type if the preferred type cannot be retrieved.\n *\n * @param preferredCameraType\n * @param preferredWidth\n * @param preferredHeight\n */\nexport async function getPreferredStreamDevice(\n preferredCameraType: CameraType,\n preferredWidth?: number | ConstrainLongRange,\n preferredHeight?: number | ConstrainLongRange\n): Promise {\n try {\n return await getStreamDevice(preferredCameraType, preferredWidth, preferredHeight);\n } catch (error) {\n // A hack on desktop browsers to ensure any camera is used.\n // eslint-disable-next-line no-undef\n if (error instanceof OverconstrainedError && error.constraint === 'facingMode') {\n const nextCameraType =\n preferredCameraType === CameraType.back ? CameraType.front : CameraType.back;\n return await getStreamDevice(nextCameraType, preferredWidth, preferredHeight);\n }\n throw error;\n }\n}\n\nexport async function getStreamDevice(\n preferredCameraType: CameraType,\n preferredWidth?: number | ConstrainLongRange,\n preferredHeight?: number | ConstrainLongRange\n): Promise {\n const constraints: MediaStreamConstraints = getIdealConstraints(\n preferredCameraType,\n preferredWidth,\n preferredHeight\n );\n const stream: MediaStream = await requestUserMediaAsync(constraints);\n return stream;\n}\n\nexport function isWebKit(): boolean {\n return /WebKit/.test(navigator.userAgent) && !/Edg/.test(navigator.userAgent);\n}\n\nexport function compareStreams(a: MediaStream | null, b: MediaStream | null): boolean {\n if (!a || !b) {\n return false;\n }\n const settingsA = a.getTracks()[0].getSettings();\n const settingsB = b.getTracks()[0].getSettings();\n return settingsA.deviceId === settingsB.deviceId;\n}\n\nexport function capture(\n video: HTMLVideoElement,\n settings: MediaTrackSettings,\n config: CameraPictureOptions\n): CameraCapturedPicture {\n const base64 = captureImage(video, config);\n\n const capturedPicture: CameraCapturedPicture = {\n uri: base64,\n base64,\n width: 0,\n height: 0,\n };\n\n if (settings) {\n const { width = 0, height = 0 } = settings;\n capturedPicture.width = width;\n capturedPicture.height = height;\n capturedPicture.exif = settings;\n }\n\n if (config.onPictureSaved) {\n config.onPictureSaved(capturedPicture);\n }\n return capturedPicture;\n}\n\nexport async function syncTrackCapabilities(\n cameraType: CameraType,\n stream: MediaStream | null,\n settings: WebCameraSettings = {}\n): Promise {\n if (stream?.getVideoTracks) {\n await Promise.all(\n stream.getVideoTracks().map((track) => onCapabilitiesReady(cameraType, track, settings))\n );\n }\n}\n\n// https://developer.mozilla.org/en-US/docs/Web/API/MediaTrackConstraints\nasync function onCapabilitiesReady(\n cameraType: CameraType,\n track: MediaStreamTrack,\n settings: WebCameraSettings = {}\n): Promise {\n const capabilities = track.getCapabilities();\n\n // Create an empty object because if you set a constraint that isn't available an error will be thrown.\n const constraints: MediaTrackConstraintSet = {};\n\n // TODO(Bacon): Add `pointsOfInterest` support\n const clampedValues = [\n 'exposureCompensation',\n 'colorTemperature',\n 'iso',\n 'brightness',\n 'contrast',\n 'saturation',\n 'sharpness',\n 'focusDistance',\n 'zoom',\n ];\n\n for (const property of clampedValues) {\n if (capabilities[property]) {\n constraints[property] = convertNormalizedSetting(capabilities[property], settings[property]);\n }\n }\n\n function validatedInternalConstrainedValue(\n constraintKey: string,\n settingsKey: string,\n converter: (settingValue: any) => IConvertedType\n ) {\n const convertedSetting = converter(settings[settingsKey]);\n return validatedConstrainedValue({\n constraintKey,\n settingsKey,\n convertedSetting,\n capabilities,\n settings,\n cameraType,\n });\n }\n\n if (capabilities.focusMode && settings.autoFocus !== undefined) {\n constraints.focusMode = validatedInternalConstrainedValue(\n 'focusMode',\n 'autoFocus',\n CapabilityUtils.convertAutoFocusJSONToNative\n );\n }\n\n if (capabilities.torch && settings.flashMode !== undefined) {\n constraints.torch = validatedInternalConstrainedValue(\n 'torch',\n 'flashMode',\n CapabilityUtils.convertFlashModeJSONToNative\n );\n }\n\n if (capabilities.whiteBalanceMode && settings.whiteBalance !== undefined) {\n constraints.whiteBalanceMode = validatedInternalConstrainedValue<\n MediaTrackConstraintSet['whiteBalanceMode']\n >('whiteBalanceMode', 'whiteBalance', CapabilityUtils.convertWhiteBalanceJSONToNative);\n }\n\n try {\n await track.applyConstraints({ advanced: [constraints] });\n } catch (error) {\n if (__DEV__) console.warn('Failed to apply constraints', error);\n }\n}\n\nexport function stopMediaStream(stream: MediaStream | null) {\n if (!stream) {\n return;\n }\n if (stream.getAudioTracks) {\n stream.getAudioTracks().forEach((track) => track.stop());\n }\n if (stream.getVideoTracks) {\n stream.getVideoTracks().forEach((track) => track.stop());\n }\n if (isMediaStreamTrack(stream)) {\n stream.stop();\n }\n}\n\nexport function setVideoSource(\n video: HTMLVideoElement,\n stream: MediaStream | MediaSource | Blob | null\n): void {\n const createObjectURL = window.URL.createObjectURL ?? window.webkitURL.createObjectURL;\n\n if (typeof video.srcObject !== 'undefined') {\n video.srcObject = stream;\n } else if (typeof (video as any).mozSrcObject !== 'undefined') {\n (video as any).mozSrcObject = stream;\n } else if (stream && createObjectURL) {\n video.src = createObjectURL(stream as MediaSource | Blob);\n }\n\n if (!stream) {\n const revokeObjectURL = window.URL.revokeObjectURL ?? window.webkitURL.revokeObjectURL;\n const source = video.src ?? video.srcObject ?? (video as any).mozSrcObject;\n if (revokeObjectURL && typeof source === 'string') {\n revokeObjectURL(source);\n }\n }\n}\n\nexport function isCapabilityAvailable(video: HTMLVideoElement, keyName: string): boolean {\n const stream = video.srcObject;\n\n if (stream instanceof MediaStream) {\n const videoTrack = stream.getVideoTracks()[0];\n return videoTrack.getCapabilities?.()?.[keyName];\n }\n\n return false;\n}\n\nfunction isMediaStreamTrack(input: any): input is MediaStreamTrack {\n return typeof input.stop === 'function';\n}\n\nfunction convertNormalizedSetting(range: MediaSettingsRange, value?: number): number | undefined {\n if (!value) {\n return;\n }\n // convert the normalized incoming setting to the native camera zoom range\n const converted = convertRange(value, [range.min, range.max]);\n // clamp value so we don't get an error\n return Math.min(range.max, Math.max(range.min, converted));\n}\n\nfunction convertRange(value: number, r2: number[], r1: number[] = [0, 1]): number {\n return ((value - r1[0]) * (r2[1] - r2[0])) / (r1[1] - r1[0]) + r2[0];\n}\n\nfunction validatedConstrainedValue(props: {\n constraintKey: string;\n settingsKey: string;\n convertedSetting: T;\n capabilities: MediaTrackCapabilities;\n settings: WebCameraSettings;\n cameraType: string;\n}): T | undefined {\n const { constraintKey, settingsKey, convertedSetting, capabilities, settings, cameraType } =\n props;\n const setting = settings[settingsKey];\n if (\n Array.isArray(capabilities[constraintKey]) &&\n convertedSetting &&\n !capabilities[constraintKey].includes(convertedSetting)\n ) {\n if (__DEV__) {\n // Only warn in dev mode.\n console.warn(\n ` { ${settingsKey}: \"${setting}\" } (converted to \"${convertedSetting}\" in the browser) is not supported for camera type \"${cameraType}\" in your browser. Using the default value instead.`\n );\n }\n return undefined;\n }\n return convertedSetting;\n}\n"]}