@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
73 lines • 11.6 kB
JavaScript
import { Injectable } from '@angular/core';
import { concat, fromEvent, Observable } from 'rxjs';
import * as i0 from "@angular/core";
export class FrameExtractionService {
createVideoPlayer(source) {
const videoPlayer = document.createElement('video');
videoPlayer.preload = 'auto';
videoPlayer.src = source;
return videoPlayer;
}
createCanvas(width, height) {
const canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
return canvas;
}
goToFrame(videoPlayer, time) {
videoPlayer.currentTime = time;
return fromEvent(videoPlayer, time === 0 ? 'loadeddata' : 'seeked');
}
getThumbnail(videoPlayer, canvas, time, width = 160, height = 90) {
return Observable.create((observer) => {
// go to specified frame
const subscription = this.goToFrame(videoPlayer, time).subscribe(() => {
// create image from current frame
canvas.getContext('2d').drawImage(videoPlayer, 0, 0, width, height);
observer.next({ image: canvas.toDataURL(), width, height, time });
observer.complete();
subscription.unsubscribe();
});
});
}
getFrameThumbnail(source, width, height, time) {
// create required elements
let videoPlayer = this.createVideoPlayer(source);
let canvas = this.createCanvas(width, height);
const frameSubscription = this.getThumbnail(videoPlayer, canvas, time, width, height);
// ensure we release memory after we are finished
frameSubscription.subscribe(null, null, () => {
videoPlayer = null;
canvas = null;
});
return frameSubscription;
}
getFrameThumbnails(source, width, height, start, end, skip = 5) {
// create required elements
let videoPlayer = this.createVideoPlayer(source);
let canvas = this.createCanvas(width, height);
return Observable.create((observer) => {
fromEvent(videoPlayer, 'loadedmetadata').subscribe(() => {
// calculate the frames required
const frames = [];
for (let idx = start; idx < end; idx += skip) {
frames.push(this.getThumbnail(videoPlayer, canvas, idx, width, height));
}
concat(...frames).subscribe((frame) => observer.next(frame), null, () => {
videoPlayer = null;
canvas = null;
observer.complete();
});
});
});
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: FrameExtractionService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: FrameExtractionService, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: FrameExtractionService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root'
}]
}] });
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"frame-extraction.service.js","sourceRoot":"","sources":["../../../../../src/services/frame-extraction/frame-extraction.service.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,UAAU,EAAE,MAAM,eAAe,CAAC;AAC3C,OAAO,EAAE,MAAM,EAAE,SAAS,EAAE,UAAU,EAAY,MAAM,MAAM,CAAC;;AAK/D,MAAM,OAAO,sBAAsB;IAEvB,iBAAiB,CAAC,MAAc;QACpC,MAAM,WAAW,GAAG,QAAQ,CAAC,aAAa,CAAC,OAAO,CAAC,CAAC;QACpD,WAAW,CAAC,OAAO,GAAG,MAAM,CAAC;QAC7B,WAAW,CAAC,GAAG,GAAG,MAAM,CAAC;QACzB,OAAO,WAAW,CAAC;IACvB,CAAC;IAEO,YAAY,CAAC,KAAa,EAAE,MAAc;QAC9C,MAAM,MAAM,GAAG,QAAQ,CAAC,aAAa,CAAC,QAAQ,CAAC,CAAC;QAChD,MAAM,CAAC,KAAK,GAAG,KAAK,CAAC;QACrB,MAAM,CAAC,MAAM,GAAG,MAAM,CAAC;QACvB,OAAO,MAAM,CAAC;IAClB,CAAC;IAEO,SAAS,CAAC,WAA6B,EAAE,IAAY;QACzD,WAAW,CAAC,WAAW,GAAG,IAAI,CAAC;QAC/B,OAAO,SAAS,CAAC,WAAW,EAAE,IAAI,KAAK,CAAC,CAAC,CAAC,CAAC,YAAY,CAAC,CAAC,CAAC,QAAQ,CAAC,CAAC;IACxE,CAAC;IAEO,YAAY,CAAC,WAA6B,EAAE,MAAyB,EAAE,IAAY,EAAE,QAAgB,GAAG,EAAE,SAAiB,EAAE;QAEjI,OAAO,UAAU,CAAC,MAAM,CAAC,CAAC,QAAkC,EAAE,EAAE;YAE5D,wBAAwB;YACxB,MAAM,YAAY,GAAG,IAAI,CAAC,SAAS,CAAC,WAAW,EAAE,IAAI,CAAC,CAAC,SAAS,CAAC,GAAG,EAAE;gBAClE,kCAAkC;gBAClC,MAAM,CAAC,UAAU,CAAC,IAAI,CAAC,CAAC,SAAS,CAAC,WAAW,EAAE,CAAC,EAAE,CAAC,EAAE,KAAK,EAAE,MAAM,CAAC,CAAC;gBACpE,QAAQ,CAAC,IAAI,CAAC,EAAE,KAAK,EAAE,MAAM,CAAC,SAAS,EAAE,EAAE,KAAK,EAAE,MAAM,EAAE,IAAI,EAAE,CAAC,CAAC;gBAClE,QAAQ,CAAC,QAAQ,EAAE,CAAC;gBACpB,YAAY,CAAC,WAAW,EAAE,CAAC;YAC/B,CAAC,CAAC,CAAC;QACP,CAAC,CAAC,CAAC;IACP,CAAC;IAED,iBAAiB,CAAC,MAAc,EAAE,KAAa,EAAE,MAAc,EAAE,IAAY;QAEzE,2BAA2B;QAC3B,IAAI,WAAW,GAAG,IAAI,CAAC,iBAAiB,CAAC,MAAM,CAAC,CAAC;QACjD,IAAI,MAAM,GAAG,IAAI,CAAC,YAAY,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC;QAE9C,MAAM,iBAAiB,GAAG,IAAI,CAAC,YAAY,CAAC,WAAW,EAAE,MAAM,EAAE,IAAI,EAAE,KAAK,EAAE,MAAM,CAAC,CAAC;QAEtF,iDAAiD;QACjD,iBAAiB,CAAC,SAAS,CAAC,IAAI,EAAE,IAAI,EAAE,GAAG,EAAE;YACzC,WAAW,GAAG,IAAI,CAAC;YACnB,MAAM,GAAG,IAAI,CAAC;QAClB,CAAC,CAAC,CAAC;QAEH,OAAO,iBAAiB,CAAC;IAC7B,CAAC;IAED,kBAAkB,CAAC,MAAc,EAAE,KAAa,EAAE,MAAc,EAAE,KAAa,EAAE,GAAW,EAAE,OAAe,CAAC;QAE1G,2BAA2B;QAC3B,IAAI,WAAW,GAAG,IAAI,CAAC,iBAAiB,CAAC,MAAM,CAAC,CAAC;QACjD,IAAI,MAAM,GAAG,IAAI,CAAC,YAAY,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC;QAE9C,OAAO,UAAU,CAAC,MAAM,CAAC,CAAC,QAAkC,EAAE,EAAE;YAE5D,SAAS,CAAC,WAAW,EAAE,gBAAgB,CAAC,CAAC,SAAS,CAAC,GAAG,EAAE;gBAEpD,gCAAgC;gBAChC,MAAM,MAAM,GAAG,EAAE,CAAC;gBAElB,KAAK,IAAI,GAAG,GAAG,KAAK,EAAE,GAAG,GAAG,GAAG,EAAE,GAAG,IAAI,IAAI,EAAE,CAAC;oBAC3C,MAAM,CAAC,IAAI,CAAC,IAAI,CAAC,YAAY,CAAC,WAAW,EAAE,MAAM,EAAE,GAAG,EAAE,KAAK,EAAE,MAAM,CAAC,CAAC,CAAC;gBAC5E,CAAC;gBAED,MAAM,CAAC,GAAG,MAAM,CAAC,CAAC,SAAS,CAAC,CAAC,KAAqB,EAAE,EAAE,CAAC,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,EAAE,IAAI,EAAE,GAAG,EAAE;oBACpF,WAAW,GAAG,IAAI,CAAC;oBACnB,MAAM,GAAG,IAAI,CAAC;oBACd,QAAQ,CAAC,QAAQ,EAAE,CAAC;gBACxB,CAAC,CAAC,CAAC;YACP,CAAC,CAAC,CAAC;QAEP,CAAC,CAAC,CAAC;IACP,CAAC;+GA9EQ,sBAAsB;mHAAtB,sBAAsB,cAFnB,MAAM;;4FAET,sBAAsB;kBAHlC,UAAU;mBAAC;oBACR,UAAU,EAAE,MAAM;iBACrB","sourcesContent":["import { Injectable } from '@angular/core';\nimport { concat, fromEvent, Observable, Observer } from 'rxjs';\n\n@Injectable({\n    providedIn: 'root'\n})\nexport class FrameExtractionService {\n\n    private createVideoPlayer(source: string): HTMLVideoElement {\n        const videoPlayer = document.createElement('video');\n        videoPlayer.preload = 'auto';\n        videoPlayer.src = source;\n        return videoPlayer;\n    }\n\n    private createCanvas(width: number, height: number): HTMLCanvasElement {\n        const canvas = document.createElement('canvas');\n        canvas.width = width;\n        canvas.height = height;\n        return canvas;\n    }\n\n    private goToFrame(videoPlayer: HTMLVideoElement, time: number): Observable<Event> {\n        videoPlayer.currentTime = time;\n        return fromEvent(videoPlayer, time === 0 ? 'loadeddata' : 'seeked');\n    }\n\n    private getThumbnail(videoPlayer: HTMLVideoElement, canvas: HTMLCanvasElement, time: number, width: number = 160, height: number = 90): Observable<ExtractedFrame> {\n\n        return Observable.create((observer: Observer<ExtractedFrame>) => {\n\n            // go to specified frame\n            const subscription = this.goToFrame(videoPlayer, time).subscribe(() => {\n                // create image from current frame\n                canvas.getContext('2d').drawImage(videoPlayer, 0, 0, width, height);\n                observer.next({ image: canvas.toDataURL(), width, height, time });\n                observer.complete();\n                subscription.unsubscribe();\n            });\n        });\n    }\n\n    getFrameThumbnail(source: string, width: number, height: number, time: number): Observable<ExtractedFrame> {\n\n        // create required elements\n        let videoPlayer = this.createVideoPlayer(source);\n        let canvas = this.createCanvas(width, height);\n\n        const frameSubscription = this.getThumbnail(videoPlayer, canvas, time, width, height);\n\n        // ensure we release memory after we are finished\n        frameSubscription.subscribe(null, null, () => {\n            videoPlayer = null;\n            canvas = null;\n        });\n\n        return frameSubscription;\n    }\n\n    getFrameThumbnails(source: string, width: number, height: number, start: number, end: number, skip: number = 5): Observable<ExtractedFrame> {\n\n        // create required elements\n        let videoPlayer = this.createVideoPlayer(source);\n        let canvas = this.createCanvas(width, height);\n\n        return Observable.create((observer: Observer<ExtractedFrame>) => {\n\n            fromEvent(videoPlayer, 'loadedmetadata').subscribe(() => {\n\n                // calculate the frames required\n                const frames = [];\n\n                for (let idx = start; idx < end; idx += skip) {\n                    frames.push(this.getThumbnail(videoPlayer, canvas, idx, width, height));\n                }\n\n                concat(...frames).subscribe((frame: ExtractedFrame) => observer.next(frame), null, () => {\n                    videoPlayer = null;\n                    canvas = null;\n                    observer.complete();\n                });\n            });\n\n        });\n    }\n\n}\n\nexport interface ExtractedFrame {\n    image: string;\n    width: number;\n    height: number;\n    time: number;\n}\n"]}