{"version":3,"file":"cbdev-ngx-webcam.mjs","sources":["../../src/app/modules/webcam/domain/webcam-image.ts","../../src/app/modules/webcam/util/webcam.util.ts","../../src/app/modules/webcam/webcam/webcam.component.ts","../../src/app/modules/webcam/webcam/webcam.component.html","../../src/app/modules/webcam/webcam.module.ts","../../src/app/modules/webcam/domain/webcam-init-error.ts","../../src/app/modules/webcam/domain/webcam-mirror-properties.ts","../../cbdev-ngx-webcam.ts"],"sourcesContent":["/**\n * Container class for a captured webcam image\n * @author basst314, davidshen84\n */\nexport class WebcamImage {\n\n public constructor(imageAsDataUrl: string, mimeType: string, imageData: ImageData) {\n this._mimeType = mimeType;\n this._imageAsDataUrl = imageAsDataUrl;\n this._imageData = imageData;\n }\n\n private readonly _mimeType: string = null;\n private _imageAsBase64: string = null;\n private readonly _imageAsDataUrl: string = null;\n private readonly _imageData: ImageData = null;\n\n\n /**\n * Extracts the Base64 data out of the given dataUrl.\n * @param dataUrl the given dataUrl\n * @param mimeType the mimeType of the data\n */\n private static getDataFromDataUrl(dataUrl: string, mimeType: string) {\n return dataUrl.replace(`data:${mimeType};base64,`, '');\n }\n\n /**\n * Get the base64 encoded image data\n * @returns base64 data of the image\n */\n public get imageAsBase64(): string {\n return this._imageAsBase64 ? this._imageAsBase64\n : this._imageAsBase64 = WebcamImage.getDataFromDataUrl(this._imageAsDataUrl, this._mimeType);\n }\n\n /**\n * Get the encoded image as dataUrl\n * @returns the dataUrl of the image\n */\n public get imageAsDataUrl(): string {\n return this._imageAsDataUrl;\n }\n\n /**\n * Get the ImageData object associated with the canvas' 2d context.\n * @returns the ImageData of the canvas's 2d context.\n */\n public get imageData(): ImageData {\n return this._imageData;\n }\n\n}\n","export class WebcamUtil {\n\n private static availableVideoInputs: MediaDeviceInfo[] = [];\n\n static hasVideoInputs() {\n const inputs = WebcamUtil.availableVideoInputs;\n return !!inputs.find(input => !!input.deviceId);\n }\n\n /**\n * Lists available videoInput devices\n * @returns a list of media device info.\n */\n public static async getAvailableVideoInputs(): Promise {\n if (!navigator.mediaDevices || !navigator.mediaDevices.enumerateDevices) {\n throw new Error('enumerateDevices() not supported.');\n }\n\n if (!this.hasVideoInputs()) {\n const devices = await navigator.mediaDevices.enumerateDevices();\n WebcamUtil.availableVideoInputs = devices.filter((device: MediaDeviceInfo) => device.kind === 'videoinput');\n }\n\n return WebcamUtil.availableVideoInputs;\n }\n}\n","import {AfterViewInit, Component, EventEmitter, Input, OnDestroy, Output, ViewChild} from '@angular/core';\nimport {WebcamInitError} from '../domain/webcam-init-error';\nimport {WebcamImage} from '../domain/webcam-image';\nimport {Observable, Subscription} from 'rxjs';\nimport {WebcamUtil} from '../util/webcam.util';\nimport {WebcamMirrorProperties} from '../domain/webcam-mirror-properties';\n\n@Component({\n selector: 'webcam',\n templateUrl: './webcam.component.html',\n styleUrls: ['./webcam.component.scss']\n})\nexport class WebcamComponent implements AfterViewInit, OnDestroy {\n private static DEFAULT_VIDEO_OPTIONS: MediaTrackConstraints = {facingMode: 'environment'};\n private static DEFAULT_IMAGE_TYPE: string = 'image/jpeg';\n private static DEFAULT_IMAGE_QUALITY: number = 0.92;\n\n /** Defines the max width of the webcam area in px */\n @Input() public width: number = 640;\n /** Defines the max height of the webcam area in px */\n @Input() public height: number = 480;\n /** Defines base constraints to apply when requesting video track from UserMedia */\n @Input() public videoOptions: MediaTrackConstraints = WebcamComponent.DEFAULT_VIDEO_OPTIONS;\n /** Flag to enable/disable camera switch. If enabled, a switch icon will be displayed if multiple cameras were found */\n @Input() public allowCameraSwitch: boolean = true;\n /** Parameter to control image mirroring (i.e. for user-facing camera). [\"auto\", \"always\", \"never\"] */\n @Input() public mirrorImage: string | WebcamMirrorProperties;\n /** Flag to control whether an ImageData object is stored into the WebcamImage object. */\n @Input() public captureImageData: boolean = false;\n /** The image type to use when capturing snapshots */\n @Input() public imageType: string = WebcamComponent.DEFAULT_IMAGE_TYPE;\n /** The image quality to use when capturing snapshots (number between 0 and 1) */\n @Input() public imageQuality: number = WebcamComponent.DEFAULT_IMAGE_QUALITY;\n\n /** EventEmitter which fires when an image has been captured */\n @Output() public imageCapture: EventEmitter = new EventEmitter();\n /** Emits a mediaError if webcam cannot be initialized (e.g. missing user permissions) */\n @Output() public initError: EventEmitter = new EventEmitter();\n /** Emits when the webcam video was clicked */\n @Output() public imageClick: EventEmitter = new EventEmitter();\n /** Emits the active deviceId after the active video device was switched */\n @Output() public cameraSwitched: EventEmitter = new EventEmitter();\n\n /** available video devices */\n public availableVideoInputs: MediaDeviceInfo[] = [];\n\n /** Indicates whether the video device is ready to be switched */\n public videoInitialized: boolean = false;\n\n /** If the Observable represented by this subscription emits, an image will be captured and emitted through\n * the 'imageCapture' EventEmitter */\n private triggerSubscription: Subscription;\n /** Index of active video in availableVideoInputs */\n private activeVideoInputIndex: number = -1;\n /** Subscription to switchCamera events */\n private switchCameraSubscription: Subscription;\n /** MediaStream object in use for streaming UserMedia data */\n private mediaStream: MediaStream = null;\n @ViewChild('video', {static: true}) private video: any;\n /** Canvas for Video Snapshots */\n @ViewChild('canvas', {static: true}) private canvas: any;\n\n /** width and height of the active video stream */\n private activeVideoSettings: MediaTrackSettings = null;\n\n /**\n * If the given Observable emits, an image will be captured and emitted through 'imageCapture' EventEmitter\n */\n @Input()\n public set trigger(trigger: Observable) {\n if (this.triggerSubscription) {\n this.triggerSubscription.unsubscribe();\n }\n\n // Subscribe to events from this Observable to take snapshots\n this.triggerSubscription = trigger.subscribe(() => {\n this.takeSnapshot();\n });\n }\n\n /**\n * If the given Observable emits, the active webcam will be switched to the one indicated by the emitted value.\n * @param switchCamera Indicates which webcam to switch to\n * true: cycle forwards through available webcams\n * false: cycle backwards through available webcams\n * string: activate the webcam with the given id\n */\n @Input()\n public set switchCamera(switchCamera: Observable) {\n if (this.switchCameraSubscription) {\n this.switchCameraSubscription.unsubscribe();\n }\n\n // Subscribe to events from this Observable to switch video device\n this.switchCameraSubscription = switchCamera.subscribe((value: boolean | string) => {\n if (typeof value === 'string') {\n // deviceId was specified\n this.switchToVideoInput(value);\n } else {\n // direction was specified\n this.rotateVideoInput(value !== false);\n }\n });\n }\n\n /**\n * Get MediaTrackConstraints to request streaming the given device\n * @param deviceId\n * @param baseMediaTrackConstraints base constraints to merge deviceId-constraint into\n * @returns\n */\n private static getMediaConstraintsForDevice(deviceId: string, baseMediaTrackConstraints: MediaTrackConstraints): MediaTrackConstraints {\n const result: MediaTrackConstraints = baseMediaTrackConstraints ? baseMediaTrackConstraints : this.DEFAULT_VIDEO_OPTIONS;\n if (deviceId) {\n result.deviceId = {exact: deviceId};\n }\n\n return result;\n }\n\n /**\n * Tries to harvest the deviceId from the given mediaStreamTrack object.\n * Browsers populate this object differently; this method tries some different approaches\n * to read the id.\n * @param mediaStreamTrack\n * @returns deviceId if found in the mediaStreamTrack\n */\n private static getDeviceIdFromMediaStreamTrack(mediaStreamTrack: MediaStreamTrack): string {\n if (mediaStreamTrack.getSettings && mediaStreamTrack.getSettings() && mediaStreamTrack.getSettings().deviceId) {\n return mediaStreamTrack.getSettings().deviceId;\n } else if (mediaStreamTrack.getConstraints && mediaStreamTrack.getConstraints() && mediaStreamTrack.getConstraints().deviceId) {\n const deviceIdObj: ConstrainDOMString = mediaStreamTrack.getConstraints().deviceId;\n return WebcamComponent.getValueFromConstrainDOMString(deviceIdObj);\n }\n }\n\n /**\n * Tries to harvest the facingMode from the given mediaStreamTrack object.\n * Browsers populate this object differently; this method tries some different approaches\n * to read the value.\n * @param mediaStreamTrack\n * @returns facingMode if found in the mediaStreamTrack\n */\n private static getFacingModeFromMediaStreamTrack(mediaStreamTrack: MediaStreamTrack): string {\n if (mediaStreamTrack) {\n if (mediaStreamTrack.getSettings && mediaStreamTrack.getSettings() && mediaStreamTrack.getSettings().facingMode) {\n return mediaStreamTrack.getSettings().facingMode;\n } else if (mediaStreamTrack.getConstraints && mediaStreamTrack.getConstraints() && mediaStreamTrack.getConstraints().facingMode) {\n const facingModeConstraint: ConstrainDOMString = mediaStreamTrack.getConstraints().facingMode;\n return WebcamComponent.getValueFromConstrainDOMString(facingModeConstraint);\n }\n }\n }\n\n /**\n * Determines whether the given mediaStreamTrack claims itself as user facing\n * @param mediaStreamTrack\n */\n private static isUserFacing(mediaStreamTrack: MediaStreamTrack): boolean {\n const facingMode: string = WebcamComponent.getFacingModeFromMediaStreamTrack(mediaStreamTrack);\n return facingMode ? 'user' === facingMode.toLowerCase() : false;\n }\n\n /**\n * Extracts the value from the given ConstrainDOMString\n * @param constrainDOMString\n */\n private static getValueFromConstrainDOMString(constrainDOMString: ConstrainDOMString): string {\n if (constrainDOMString) {\n if (constrainDOMString instanceof String) {\n return String(constrainDOMString);\n } else if (Array.isArray(constrainDOMString) && Array(constrainDOMString).length > 0) {\n return String(constrainDOMString[0]);\n } else if (typeof constrainDOMString === 'object') {\n if (constrainDOMString['exact']) {\n return String(constrainDOMString['exact']);\n } else if (constrainDOMString['ideal']) {\n return String(constrainDOMString['ideal']);\n }\n }\n }\n\n return null;\n }\n\n public async ngAfterViewInit() {\n try {\n await this.detectAvailableDevices();\n } catch (e) {\n this.initError.next({message: e.message});\n }\n this.switchToVideoInput(null);\n }\n\n public ngOnDestroy(): void {\n this.stopMediaTracks();\n this.unsubscribeFromSubscriptions();\n }\n\n /**\n * Takes a snapshot of the current webcam's view and emits the image as an event\n */\n public takeSnapshot(): void {\n // set canvas size to actual video size\n const _video = this.nativeVideoElement;\n const dimensions = {width: this.width, height: this.height};\n if (_video.videoWidth) {\n dimensions.width = _video.videoWidth;\n dimensions.height = _video.videoHeight;\n }\n\n const _canvas = this.canvas.nativeElement;\n _canvas.width = dimensions.width;\n _canvas.height = dimensions.height;\n\n // paint snapshot image to canvas\n const context2d = _canvas.getContext('2d');\n context2d.drawImage(_video, 0, 0);\n\n // read canvas content as image\n const mimeType: string = this.imageType ? this.imageType : WebcamComponent.DEFAULT_IMAGE_TYPE;\n const quality: number = this.imageQuality ? this.imageQuality : WebcamComponent.DEFAULT_IMAGE_QUALITY;\n const dataUrl: string = _canvas.toDataURL(mimeType, quality);\n\n // get the ImageData object from the canvas' context.\n let imageData: ImageData = null;\n\n if (this.captureImageData) {\n imageData = context2d.getImageData(0, 0, _canvas.width, _canvas.height);\n }\n\n this.imageCapture.next(new WebcamImage(dataUrl, mimeType, imageData));\n }\n\n /**\n * Switches to the next/previous video device\n * @param forward\n */\n public rotateVideoInput(forward: boolean) {\n if (this.availableVideoInputs && this.availableVideoInputs.length > 1) {\n const increment: number = forward ? 1 : (this.availableVideoInputs.length - 1);\n const nextInputIndex = (this.activeVideoInputIndex + increment) % this.availableVideoInputs.length;\n this.switchToVideoInput(this.availableVideoInputs[nextInputIndex].deviceId);\n }\n }\n\n /**\n * Switches the camera-view to the specified video device\n */\n public switchToVideoInput(deviceId: string): void {\n this.videoInitialized = false;\n this.stopMediaTracks();\n this.initWebcam(deviceId, this.videoOptions);\n }\n\n\n /**\n * Event-handler for video resize event.\n * Triggers Angular change detection so that new video dimensions get applied\n */\n public videoResize(): void {\n // here to trigger Angular change detection\n }\n\n public get videoWidth() {\n const videoRatio = this.getVideoAspectRatio();\n return Math.min(this.width, this.height * videoRatio);\n }\n\n public get videoHeight() {\n const videoRatio = this.getVideoAspectRatio();\n return Math.min(this.height, this.width / videoRatio);\n }\n\n public get videoStyleClasses() {\n let classes: string = '';\n\n if (this.isMirrorImage()) {\n classes += 'mirrored ';\n }\n\n return classes.trim();\n }\n\n public get nativeVideoElement() {\n return this.video.nativeElement;\n }\n\n /**\n * Returns the video aspect ratio of the active video stream\n */\n private getVideoAspectRatio(): number {\n // calculate ratio from video element dimensions if present\n const videoElement = this.nativeVideoElement;\n if (videoElement.videoWidth && videoElement.videoWidth > 0 &&\n videoElement.videoHeight && videoElement.videoHeight > 0) {\n\n return videoElement.videoWidth / videoElement.videoHeight;\n }\n\n // nothing present - calculate ratio based on width/height params\n return this.width / this.height;\n }\n\n /**\n * Init webcam live view\n */\n private initWebcam(deviceId: string, userVideoTrackConstraints: MediaTrackConstraints) {\n const _video = this.nativeVideoElement;\n if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n\n // merge deviceId -> userVideoTrackConstraints\n const videoTrackConstraints = WebcamComponent.getMediaConstraintsForDevice(deviceId, userVideoTrackConstraints);\n\n navigator.mediaDevices.getUserMedia({video: videoTrackConstraints})\n .then(async (stream: MediaStream) => {\n this.mediaStream = stream;\n _video.srcObject = stream;\n _video.play();\n\n this.activeVideoSettings = stream.getVideoTracks()[0].getSettings();\n const activeDeviceId: string = WebcamComponent.getDeviceIdFromMediaStreamTrack(stream.getVideoTracks()[0]);\n\n this.cameraSwitched.next(activeDeviceId);\n\n // Initial detect may run before user gave permissions, returning no deviceIds. This prevents later camera switches. (#47)\n // Run detect once again within getUserMedia callback, to make sure this time we have permissions and get deviceIds.\n await this.detectAvailableDevices();\n\n this.activeVideoInputIndex = activeDeviceId ? this.availableVideoInputs\n .findIndex((mediaDeviceInfo: MediaDeviceInfo) => mediaDeviceInfo.deviceId === activeDeviceId) : -1;\n this.videoInitialized = true;\n })\n .catch((err: DOMException) => {\n this.initError.next({message: err.message, mediaStreamError: err});\n });\n } else {\n this.initError.next({message: 'Cannot read UserMedia from MediaDevices.'});\n }\n }\n\n private getActiveVideoTrack(): MediaStreamTrack {\n return this.mediaStream ? this.mediaStream.getVideoTracks()[0] : null;\n }\n\n private isMirrorImage(): boolean {\n if (!this.getActiveVideoTrack()) {\n return false;\n }\n\n // check for explicit mirror override parameter\n {\n let mirror: string = 'auto';\n if (this.mirrorImage) {\n if (typeof this.mirrorImage === 'string') {\n mirror = String(this.mirrorImage).toLowerCase();\n } else {\n // WebcamMirrorProperties\n if (this.mirrorImage.x) {\n mirror = this.mirrorImage.x.toLowerCase();\n }\n }\n }\n\n switch (mirror) {\n case 'always':\n return true;\n case 'never':\n return false;\n }\n }\n\n // default: enable mirroring if webcam is user facing\n return WebcamComponent.isUserFacing(this.getActiveVideoTrack());\n }\n\n /**\n * Stops all active media tracks.\n * This prevents the webcam from being indicated as active,\n * even if it is no longer used by this component.\n */\n private stopMediaTracks() {\n if (this.mediaStream && this.mediaStream.getTracks) {\n // getTracks() returns all media tracks (video+audio)\n this.mediaStream.getTracks()\n .forEach((track: MediaStreamTrack) => track.stop());\n }\n }\n\n /**\n * Unsubscribe from all open subscriptions\n */\n private unsubscribeFromSubscriptions() {\n if (this.triggerSubscription) {\n this.triggerSubscription.unsubscribe();\n }\n if (this.switchCameraSubscription) {\n this.switchCameraSubscription.unsubscribe();\n }\n }\n\n /**\n * Reads available input devices\n */\n private async detectAvailableDevices(): Promise {\n this.availableVideoInputs = await WebcamUtil.getAvailableVideoInputs();\n }\n\n}\n","
\n \n
1 && videoInitialized\" (click)=\"rotateVideoInput(true)\">
\n \n
\n","import {NgModule} from '@angular/core';\nimport {CommonModule} from '@angular/common';\nimport {WebcamComponent} from './webcam/webcam.component';\n\nconst COMPONENTS = [\n WebcamComponent\n];\n\n@NgModule({\n imports: [\n CommonModule\n ],\n declarations: [\n COMPONENTS\n ],\n exports: [\n COMPONENTS\n ]\n})\nexport class WebcamModule {\n}\n","export class WebcamInitError {\n public message: string = null;\n public mediaStreamError: DOMException = null;\n}\n","export class WebcamMirrorProperties {\n public x: string; // [\"auto\", \"always\", \"never\"]\n}\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from 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