Remove TTS narration and improve BGM

src/game/audio/SoundDirector.ts

@@ -1,18 +1,4 @@
 type AudioTrackMap = Record<string, string>;
-export type VoiceRole = 'narrator' | 'liuBei' | 'guanYu' | 'zhangFei';
-
-type PitchSafeAudio = HTMLAudioElement & {
-  preservesPitch?: boolean;
-  mozPreservesPitch?: boolean;
-  webkitPreservesPitch?: boolean;
-};
-
-const rolePlayback: Record<VoiceRole, { rate: number; volume: number }> = {
-  narrator: { rate: 0.98, volume: 0.9 },
-  liuBei: { rate: 0.96, volume: 0.92 },
-  guanYu: { rate: 0.84, volume: 0.95 },
-  zhangFei: { rate: 1.05, volume: 1 }
-};
 
 class SoundDirector {
   private context?: AudioContext;
@@ -20,24 +6,16 @@ class SoundDirector {
   private started = false;
   private muted = false;
   private musicTracks: AudioTrackMap = {};
-  private voiceTracks: AudioTrackMap = {};
   private music?: HTMLAudioElement;
-  private voice?: HTMLAudioElement;
   private currentMusicKey?: string;
   private pendingMusicKey?: string;
   private musicFadeTimer?: number;
-  private musicRampTimer?: number;
-  private readonly musicVolume = 0.46;
-  private readonly duckedMusicVolume = 0.18;
+  private readonly musicVolume = 0.56;
 
   registerMusicTracks(tracks: AudioTrackMap) {
     this.musicTracks = tracks;
   }
 
-  registerVoiceTracks(tracks: AudioTrackMap) {
-    this.voiceTracks = tracks;
-  }
-
   start() {
     if (this.started) {
       this.resume();
@@ -74,9 +52,6 @@ class SoundDirector {
     if (this.music) {
       this.music.muted = muted;
     }
-    if (this.voice) {
-      this.voice.muted = muted;
-    }
 
     if (!this.context || !this.master) {
       return;
@@ -130,64 +105,7 @@ class SoundDirector {
     this.music = next;
     this.currentMusicKey = key;
     void next.play().catch(() => undefined);
-    this.fadeMusic(previous, next, this.voice ? this.duckedMusicVolume : this.musicVolume);
-  }
-
-  playVoice(key?: string, role: VoiceRole = 'narrator') {
-    if (!key || !this.started) {
-      this.stopVoice();
-      return;
-    }
-    this.stopVoice(false);
-
-    const src = this.voiceTracks[key];
-    if (!src) {
-      return;
-    }
-
-    const profile = rolePlayback[role] ?? rolePlayback.narrator;
-    const voice = new Audio(src) as PitchSafeAudio;
-    voice.preload = 'auto';
-    voice.muted = this.muted;
-    voice.volume = profile.volume;
-    voice.playbackRate = profile.rate;
-    voice.preservesPitch = false;
-    voice.mozPreservesPitch = false;
-    voice.webkitPreservesPitch = false;
-    voice.addEventListener('ended', () => {
-      if (this.voice === voice) {
-        this.voice = undefined;
-        this.duckMusic(false);
-      }
-    });
-    voice.addEventListener('error', () => {
-      if (this.voice === voice) {
-        this.voice = undefined;
-        this.duckMusic(false);
-      }
-    });
-
-    this.voice = voice;
-    this.duckMusic(true);
-    void voice.play().catch(() => {
-      if (this.voice === voice) {
-        this.voice = undefined;
-        this.duckMusic(false);
-      }
-    });
-  }
-
-  stopVoice(restoreMusic = true) {
-    if (!this.voice) {
-      return;
-    }
-
-    this.voice.pause();
-    this.voice.currentTime = 0;
-    this.voice = undefined;
-    if (restoreMusic) {
-      this.duckMusic(false);
-    }
+    this.fadeMusic(previous, next, this.musicVolume);
   }
 
   private playTone(
@@ -246,38 +164,6 @@ class SoundDirector {
     }, 32);
   }
 
-  private duckMusic(ducked: boolean) {
-    if (!this.music) {
-      return;
-    }
-
-    if (ducked && this.musicFadeTimer) {
-      window.clearInterval(this.musicFadeTimer);
-      this.musicFadeTimer = undefined;
-    }
-
-    if (this.musicRampTimer) {
-      window.clearInterval(this.musicRampTimer);
-    }
-
-    const from = this.music.volume;
-    const to = ducked ? this.duckedMusicVolume : this.musicVolume;
-    const duration = 260;
-    const startedAt = performance.now();
-
-    this.musicRampTimer = window.setInterval(() => {
-      if (!this.music) {
-        return;
-      }
-
-      const progress = Math.min(1, (performance.now() - startedAt) / duration);
-      this.music.volume = from + (to - from) * progress;
-      if (progress >= 1 && this.musicRampTimer) {
-        window.clearInterval(this.musicRampTimer);
-        this.musicRampTimer = undefined;
-      }
-    }, 32);
-  }
 }
 
 declare global {