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Introduce basic audio playback control

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This commit is contained in:
Travis Ralston 2021-06-21 16:18:39 -06:00
parent 470778cbb8
commit dda60949c3
6 changed files with 203 additions and 20 deletions
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18
src/voice/PlaybackClock.ts
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@ -14,8 +14,9 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
import {SimpleObservable} from "matrix-widget-api";
import {IDestroyable} from "../utils/IDestroyable";
import { SimpleObservable } from "matrix-widget-api";
import { IDestroyable } from "../utils/IDestroyable";
import { MatrixEvent } from "matrix-js-sdk/src/models/event";
// Because keeping track of time is sufficiently complicated...
export class PlaybackClock implements IDestroyable {
@ -25,12 +26,13 @@ export class PlaybackClock implements IDestroyable {
private observable = new SimpleObservable<number[]>();
private timerId: number;
private clipDuration = 0;
private placeholderDuration = 0;
public constructor(private context: AudioContext) {
}
public get durationSeconds(): number {
return this.clipDuration;
return this.clipDuration || this.placeholderDuration;
}
public set durationSeconds(val: number) {
@ -54,6 +56,16 @@ export class PlaybackClock implements IDestroyable {
}
};
/**
* Populates default information about the audio clip from the event body.
* The placeholders will be overridden once known.
* @param {MatrixEvent} event The event to use for placeholders.
*/
public populatePlaceholdersFrom(event: MatrixEvent) {
const durationSeconds = Number(event.getContent()['info']?.['duration']);
if (Number.isFinite(durationSeconds)) this.placeholderDuration = durationSeconds;
}
/**
* Mark the time in the audio context where the clip starts/has been loaded.
* This is to ensure the clock isn't skewed into thinking it is ~0.5s into