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import { MediaInfo as Mediainfo, ResultObject } from 'mediainfo.js/dist/types';
import JSZip from 'jszip';
import semver from 'semver';
import timeline from './timeline';
import { LocalVideoSettings } from './components/videosourcesettings';
// garbage garbage garbage
declare var MediaInfo: () => Promise<Mediainfo>;
export function arrayBufferToBase64(buffer: ArrayBuffer, mimetype?: string) {
var out = '';
if (mimetype) out += 'data:' + mimetype + ';base64,';
out += btoa(new Uint8Array(buffer).reduce((data, byte) => data + String.fromCharCode(byte), ''));
return out;
}
const filext = '.prspr';
interface VideoSource {
load: (dir: JSZip) => void;
save: (dir: JSZip) => void;
}
export class LocalVideo implements VideoSource {
source: ArrayBuffer;
type: string;
mimetype: string;
framerate: number;
framecount: number;
config: {
fullyBuffer: boolean;
};
constructor() {
this.type = 'local';
this.config = {
fullyBuffer: false,
};
}
async getVideoInfo() {
var mediainfo = await MediaInfo();
var result = await mediainfo.analyzeData(
() => this.source.byteLength,
(size, offset) => new Uint8Array(this.source.slice(offset, offset + size)),
) as ResultObject;
var meta = result.media.track[0] as unknown as {
FrameCount: string;
FrameRate: string;
};
this.framecount = Number(meta.FrameCount);
this.framerate = Number(meta.FrameRate);
}
async load(dir: JSZip) {
this.source = await dir.file('video').async('arraybuffer');
this.framerate = Number(await dir.file('framerate').async('string'));
this.framecount = Number(await dir.file('framecount').async('string'));
}
save(dir: JSZip) {
dir.file('video', this.source);
dir.file('framecount', this.framecount.toString());
dir.file('framerate', this.framerate.toString());
dir.file('type', this.type);
}
}
export const VideoSources = [
{ type: 'local', class: LocalVideo, name: 'Local video', settings: LocalVideoSettings },
] as const;
export type VideoSourceClass = InstanceType<typeof VideoSources[number]['class']>;
export type VideoSourceType = typeof VideoSources[number]['type'];
export class PresentationSettings {
keybindings: {
NextSlide: string[];
PreviousSlide: string[];
ShowMenu: string[];
};
controls: {
ControlType: 'FullScreen' | 'MenuBar';
};
remotes: {
AllowRemotes: boolean;
AllowQRRemotes: boolean;
};
constructor() {
this.keybindings = {
NextSlide: ['Space', 'n', 'Enter'],
PreviousSlide: ['Backspace', 'p'],
ShowMenu: ['Escape', 'm'],
};
this.controls = {
ControlType: 'FullScreen',
};
this.remotes = {
AllowRemotes: false,
AllowQRRemotes: false,
};
}
}
export default class {
version: string = '0.2.0';
fileVersion: string;
zip: JSZip;
timeline: timeline;
name: string;
video: VideoSourceClass;
settings: PresentationSettings;
constructor() {
this.settings = new PresentationSettings();
this.zip = new JSZip();
}
async downloadProjectFile() {
var zip = await this.zip.generateAsync({ type: 'blob' });
var blob = new Blob([zip], { type: 'application/octet-stream' });
var a = document.createElement('a');
a.href = URL.createObjectURL(blob);
a.download = this.name
.toLowerCase()
.replace(/\s/g, '-') + filext;
a.click();
}
saveProject() {
this.zip = new JSZip();
var meta = this.zip.folder('meta');
meta.file('version', this.version);
meta.file('name', this.name);
var source = this.zip.folder('source');
this.video.save(source);
source.file('mimetype', this.video.mimetype);
source.file('config', JSON.stringify(this.video.config, null, 4));
this.zip.file('slides', JSON.stringify(this.timeline, null, 4));
this.zip.file('settings', JSON.stringify(this.settings, null, 4));
}
async openProject(data: ArrayBuffer) {
this.zip = new JSZip();
await this.zip.loadAsync(data);
this.fileVersion = await this.zip.file('meta/version').async('string');
this.timeline = JSON.parse(await this.zip.file('slides').async('string'));
this.name = await this.zip.file('meta/name').async('string');
var source = this.zip.folder('source');
var type = await source.file('type').async('string');
var videoSourceType = VideoSources.find(s => s.type == type);
this.video = new videoSourceType.class();
await this.video.load(source);
this.video.mimetype = await source.file('mimetype').async('string');
if (semver.lte('0.1.1', this.fileVersion)) {
this.video.config = JSON.parse(await this.zip.file('source/config').async('string'));
}
if (semver.lte('0.2.0', this.fileVersion)) {
this.settings = JSON.parse(await this.zip.file('settings').async('string'));
}
}
}
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