79 lines
2.3 KiB
TypeScript
79 lines
2.3 KiB
TypeScript
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/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {SimpleObservable} from "matrix-widget-api";
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import {IDestroyable} from "../utils/IDestroyable";
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// Because keeping track of time is sufficiently complicated...
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export class PlaybackClock implements IDestroyable {
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private clipStart = 0;
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private stopped = true;
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private lastCheck = 0;
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private observable = new SimpleObservable<number[]>();
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private timerId: number;
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private clipDuration = 0;
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public constructor(private context: AudioContext) {
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}
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public get durationSeconds(): number {
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return this.clipDuration;
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}
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public set durationSeconds(val: number) {
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this.clipDuration = val;
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this.observable.update([this.timeSeconds, this.clipDuration]);
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}
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public get timeSeconds(): number {
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return (this.context.currentTime - this.clipStart) % this.clipDuration;
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}
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public get liveData(): SimpleObservable<number[]> {
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return this.observable;
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}
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private checkTime = () => {
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const now = this.timeSeconds;
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if (this.lastCheck !== now) {
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this.observable.update([now, this.durationSeconds]);
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this.lastCheck = now;
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}
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};
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public flagStart() {
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if (this.stopped) {
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this.clipStart = this.context.currentTime;
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this.stopped = false;
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}
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if (!this.timerId) {
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// case to number because the types are wrong
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// 100ms interval to make sure the time is as accurate as possible
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this.timerId = <number><any>setInterval(this.checkTime, 100);
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}
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}
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public flagStop() {
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this.stopped = true;
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}
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public destroy() {
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this.observable.close();
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if (this.timerId) clearInterval(this.timerId);
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}
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}
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