猫鼠游戏结束转场时，bgm ease 过度

manager/audio_manager/audio_manager.gd

@@ -17,13 +17,15 @@ var bgm_dict = {}
 
 func _ready() -> void:
 	for i in range(5):
-		var sfx_player = RandomAudioStreamPlayer.new()
-		sfx_players.append(sfx_player)
-		sfx_player.bus = "game_sfx"
-		add_child(sfx_player)
+		_create_and_add_new_player(i)
 	if Engine.is_editor_hint():
 		_reload_groups()
 
+func _create_and_add_new_player(index: int) -> void:
+	var sfx_player = RandomAudioStreamPlayer.new()
+	sfx_player.bus = "game_sfx"
+	add_child(sfx_player)
+	sfx_players.insert(index, sfx_player)
 
 func _reload_groups():
 	VIBE_GROUPS.clear()
@@ -34,6 +36,21 @@ func _reload_groups():
 			printerr("VibeGroup has no name: ", group)
 
 
+func stop_stream(stream: AudioStream, duration := 1.0) -> void:
+	for i in sfx_players.size():
+		var player = sfx_players[i]
+		if player.stream == stream:
+			if duration > 0:
+				# ease 过程将它独立拎出来
+				sfx_players.remove_at(i)
+				_create_and_add_new_player(i)
+				var tween = create_tween()
+				tween.tween_property(player, "volume_linear", 0.0, duration)
+				tween.tween_callback(player.queue_free)
+			else:
+				player.stop()
+
+
 func play_sfx(sfx: AudioStream, db := 1.0) -> void:
 	sfx_players[sfx_players_idx].stream = sfx
 	sfx_players[sfx_players_idx].volume_db = db

scene/entity/audio/sfx.gd

@@ -34,6 +34,7 @@ func _ready() -> void:
 	SceneManager.ground_transition_pre_paused.connect(_on_ground_transition_pre_paused)
 	SceneManager.pause_counter_updated.connect(_on_pause_counter_updated)
 
+
 var playing_on_debugging_paused = false
 
 
@@ -43,7 +44,10 @@ func _on_pause_counter_updated() -> void:
 
 func _set_up_process_mode_by_mode():
 	# 如果是 debug panel，则 pause
-	if mode == "场景背景音" and (SceneManager.is_node_ready() and not SceneManager.pause_counter_arr.has("debugging")):
+	if (
+		mode == "场景背景音"
+		and (SceneManager.is_node_ready() and not SceneManager.pause_counter_arr.has("debugging"))
+	):
 		process_mode = Node.PROCESS_MODE_ALWAYS
 	else:
 		if SceneManager.is_node_ready() and SceneManager.pause_counter_arr.has("debugging"):
@@ -86,9 +90,15 @@ func resart(ease_duration := 1.0):
 
 
 # queue free 导致 sfx 无法播放，使用全局声源
+# 注意需要手动调用 global_stop, 否则不会自动停止
 func global_play() -> void:
+	AudioManager.stop_stream(stream)
 	if stream:
-		AudioManager.play_sfx(stream)
+		AudioManager.play_sfx(stream, volume_db)
+
+
+func global_stop(duration := 1.5) -> void:
+	AudioManager.stop_stream(stream, duration)
 
 
 func easing_kill(duration: float = 2.0) -> Tween:
@@ -153,3 +163,4 @@ func _get(property: StringName) -> Variant:
 	elif property == "感应玩家操作":
 		return scene_sense_player_mov
 	return null
+

scene/ground/scene/c01/s06_孤儿院长廊围墙.gd

@@ -129,7 +129,7 @@ func game_intro() -> void:
 	DialogueManager.show_dialogue_balloon(dialogue_c01, "c01_s06_谈论鬼差与猫鼠游戏")
 	await DialogueManager.dialogue_ended
 	# BGM 开始后小段对话
-	$"Sfx猫鼠游戏".play()
+	$"Sfx猫鼠游戏".global_play()
 	DialogueManager.show_dialogue_balloon(dialogue_c01, "c01_s06_猫鼠游戏BGM开始")
 	await DialogueManager.dialogue_ended
 	# 重置镜头
@@ -290,7 +290,7 @@ func game_restart():
 	await Util.wait(1.0)
 	# 开始跑
 	SceneManager.release_player()
-	$"Sfx猫鼠游戏".set("parameters/switch_to_clip", "Intro")
+	$"Sfx猫鼠游戏".global_play()
 	DialogueManager.show_dialogue_balloon(dialogue_c01, "c01_s06_猫鼠游戏倒计时")
 	await Util.wait(1.5)
 	_kids_start_run()
@@ -371,6 +371,10 @@ func transport_player_to_next_scene(win: bool):
 		SceneManager.pop_debug_dialog_info("音效", "猫鼠游戏失败，传送下一场景")
 
 
+func _exit_tree() -> void:
+	$"Sfx猫鼠游戏".global_stop(3.0)
+
+
 # var s07_ground := preload("res://scene/ground/scene/c01/s07_书店外.tscn")
 # var s07_ground_node = s07_ground.instantiate()