fix: sound effects stop music playback in iOS

This also improves the overall sound performance (including Android PWA)

Co-authored-by: naskya <m@naskya.net>

README.md

@@ -38,6 +38,8 @@
 
 ## 細かい変更点
 
+- iOS で効果音と音楽の再生が干渉する問題を修正（Misskey から取り込み）
+  - 本家にもマージリクエストを出しています ([!10641](https://git.joinfirefish.org/firefish/firefish/-/merge_requests/10641))
 - HTML のコードに入るコメントアートを削除
   - 全ページにこんなの入れなくても……
 - デフォルトではバイブレーションを無効に

packages/client/src/scripts/sound.ts

@@ -1,16 +1,25 @@
 import { ColdDeviceStorage } from "@/store";
 
+const ctx = new AudioContext();
 const cache = new Map<string, HTMLAudioElement>();
 
-export function getAudio(file: string, useCache = true): HTMLAudioElement {
-	let audio: HTMLAudioElement;
+export async function getAudio(
+	file: string,
+	useCache = true,
+): HTMLAudioElement {
 	if (useCache && cache.has(file)) {
-		audio = cache.get(file);
-	} else {
-		audio = new Audio(`/static-assets/sounds/${file}.mp3`);
-		if (useCache) cache.set(file, audio);
+		return cache.get(file);
 	}
-	return audio;
+
+	const response = await fetch(`/static-assets/sounds/${file}.mp3`);
+	const arrayBuffer = await response.arrayBuffer();
+	const audioBuffer = await ctx.decodeAudioData(arrayBuffer);
+
+	if (useCache) {
+		cache.set(file, audioBuffer);
+	}
+
+	return audioBuffer;
 }
 
 export function setVolume(
@@ -28,11 +37,17 @@ export function play(type: string) {
 	playFile(sound.type, sound.volume);
 }
 
-export function playFile(file: string, volume: number) {
+export async function playFile(file: string, volume: number) {
 	const masterVolume = ColdDeviceStorage.get("sound_masterVolume");
-	if (masterVolume === 0 || volume === 0 || file.toLowerCase().includes("none"))
+	if (masterVolume === 0 || volume === 0) {
 		return;
+	}
 
-	const audio = setVolume(getAudio(file), volume);
-	audio.play();
+	const gainNode = ctx.createGain();
+	gainNode.gain.value = masterVolume * volume;
+
+	const soundSource = ctx.createBufferSource();
+	soundSource.buffer = await getAudio(file);
+	soundSource.connect(gainNode).connect(ctx.destination);
+	soundSource.start();
 }