79 lines
2.2 KiB
TypeScript
79 lines
2.2 KiB
TypeScript
// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import type { AttachmentType } from '../types/Attachment';
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import {
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hasFailed,
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hasNotResolved,
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isDownloaded,
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isGIF,
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isVideo,
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} from '../types/Attachment';
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import { count } from './grapheme';
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import { SECOND } from './durations';
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const DEFAULT_DURATION = 5 * SECOND;
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const MAX_VIDEO_DURATION = 30 * SECOND;
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export async function getStoryDuration(
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attachment: AttachmentType
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): Promise<number | undefined> {
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if (hasFailed(attachment)) {
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return DEFAULT_DURATION;
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}
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if (!isDownloaded(attachment) || hasNotResolved(attachment)) {
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return;
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}
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if (isGIF([attachment]) || isVideo([attachment])) {
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const videoEl = document.createElement('video');
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if (!attachment.url) {
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return DEFAULT_DURATION;
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}
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videoEl.src = attachment.url;
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await new Promise<void>(resolve => {
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function resolveAndRemove() {
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resolve();
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videoEl.removeEventListener('loadedmetadata', resolveAndRemove);
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}
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videoEl.addEventListener('loadedmetadata', resolveAndRemove);
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});
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const duration = Math.ceil(videoEl.duration * SECOND);
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if (isGIF([attachment])) {
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// GIFs: Loop gifs 3 times or play for 5 seconds, whichever is longer.
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return Math.min(
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Math.max(duration * 3, DEFAULT_DURATION),
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MAX_VIDEO_DURATION
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);
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}
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// Video max duration: 30 seconds
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return Math.min(duration, MAX_VIDEO_DURATION);
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}
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if (attachment.textAttachment && attachment.textAttachment.text) {
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// Minimum 5 seconds. +1 second for every 15 characters past the first
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// 15 characters (round up).
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// For text stories that include a link, +2 seconds to the playback time.
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const length = count(attachment.textAttachment.text);
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const additionalSeconds = (Math.ceil(length / 15) - 1) * SECOND;
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const linkPreviewSeconds = attachment.textAttachment.preview
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? 2 * SECOND
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: 0;
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return DEFAULT_DURATION + additionalSeconds + linkPreviewSeconds;
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}
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if (attachment.caption) {
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const length = count(attachment.caption);
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const additionalSeconds = (Math.ceil(length / 15) - 1) * SECOND;
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return DEFAULT_DURATION + additionalSeconds;
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}
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return DEFAULT_DURATION;
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}
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