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184 lines
6.6 KiB
GDScript
184 lines
6.6 KiB
GDScript
2 months ago
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class_name MusicController
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extends Node
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## Controller for music playback across scenes.
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##
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## This node persistently checks for stream players added to the scene tree.
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## It detects stream players that match the audio bus and have autoplay on.
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## It then reparents the stream players to itself, and handles blending.
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## The expected use-case is to attach this script to an autoloaded scene.
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const BLEND_BUS_PREFIX : String = "Blend"
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const MAX_DEPTH = 16
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const MINIMUM_VOLUME_DB = -80
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## Detect stream players with matching audio bus.
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@export var audio_bus : StringName = &"Music"
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@export_group("Blending")
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@export var fade_out_duration : float = 0.0 :
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set(value):
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fade_out_duration = value
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if fade_out_duration < 0:
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fade_out_duration = 0
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@export var fade_in_duration : float = 0.0 :
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set(value):
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fade_in_duration = value
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if fade_in_duration < 0:
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fade_in_duration = 0
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## Matched stream players with no stream set will stop current playback.
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@export var empty_streams_stop_player : bool = true
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var music_stream_player : AudioStreamPlayer
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var blend_audio_bus : StringName
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var blend_audio_bus_idx : int
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func fade_out( duration : float = 0.0 ):
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if not is_zero_approx(duration):
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music_stream_player.bus = audio_bus
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var tween = create_tween()
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tween.tween_property(music_stream_player, "volume_db", MINIMUM_VOLUME_DB, duration)
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return tween
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func _set_sub_audio_volume_db(sub_volume_db : float):
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AudioServer.set_bus_volume_db(blend_audio_bus_idx, sub_volume_db)
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func fade_in( duration : float = 0.0 ):
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if not is_zero_approx(duration):
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music_stream_player.bus = blend_audio_bus
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AudioServer.set_bus_volume_db(blend_audio_bus_idx, MINIMUM_VOLUME_DB)
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var tween = create_tween()
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tween.tween_method(_set_sub_audio_volume_db, MINIMUM_VOLUME_DB, 0, duration)
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return tween
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func blend_to( target_volume_db : float, duration : float = 0.0 ):
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if not is_zero_approx(duration):
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var tween = create_tween()
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tween.tween_property(music_stream_player, "volume_db", target_volume_db, duration)
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return tween
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music_stream_player.volume_db = target_volume_db
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func stop():
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if music_stream_player == null:
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return
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music_stream_player.stop()
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func play( playback_position : float = 0.0 ):
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if music_stream_player == null:
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return
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if is_zero_approx(playback_position) and not music_stream_player.playing:
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music_stream_player.play()
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else:
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music_stream_player.play(playback_position)
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func _fade_out_and_free():
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if music_stream_player == null:
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return
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var stream_player = music_stream_player
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var tween = fade_out( fade_out_duration )
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if tween != null:
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await( tween.finished )
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stream_player.queue_free()
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func _play_and_fade_in():
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play()
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fade_in( fade_in_duration )
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func _is_matching_stream( stream_player : AudioStreamPlayer ) -> bool:
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if stream_player.bus != audio_bus:
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return false
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if music_stream_player == null:
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return false
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return music_stream_player.stream == stream_player.stream
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func _connect_stream_on_tree_exiting( stream_player : AudioStreamPlayer ):
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if not stream_player.tree_exiting.is_connected(_on_removed_music_player.bind(stream_player)):
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stream_player.tree_exiting.connect(_on_removed_music_player.bind(stream_player))
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func _blend_and_remove_stream_player( stream_player : AudioStreamPlayer ):
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var playback_position := music_stream_player.get_playback_position() + AudioServer.get_time_since_last_mix()
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var old_stream_player = music_stream_player
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music_stream_player = stream_player
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music_stream_player.bus = blend_audio_bus
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play(playback_position)
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old_stream_player.stop()
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old_stream_player.queue_free()
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_connect_stream_on_tree_exiting(music_stream_player)
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func _blend_and_connect_stream_player( stream_player : AudioStreamPlayer ):
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stream_player.bus = blend_audio_bus
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_fade_out_and_free()
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music_stream_player = stream_player
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_play_and_fade_in()
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_connect_stream_on_tree_exiting(music_stream_player)
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func play_stream_player( stream_player : AudioStreamPlayer ):
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if stream_player == music_stream_player : return
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if stream_player.stream == null and not empty_streams_stop_player:
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return
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if _is_matching_stream(stream_player) :
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_blend_and_remove_stream_player(stream_player)
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else:
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_blend_and_connect_stream_player(stream_player)
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func get_stream_player( audio_stream : AudioStream ) -> AudioStreamPlayer:
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var stream_player := AudioStreamPlayer.new()
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stream_player.stream = audio_stream
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stream_player.bus = audio_bus
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add_child(stream_player)
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return stream_player
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func play_stream( audio_stream : AudioStream ) -> AudioStreamPlayer:
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var stream_player := get_stream_player(audio_stream)
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stream_player.play.call_deferred()
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play_stream_player( stream_player )
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return stream_player
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func _clone_music_player( stream_player : AudioStreamPlayer ):
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var playback_position := stream_player.get_playback_position() + AudioServer.get_time_since_last_mix()
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var audio_stream := stream_player.stream
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music_stream_player = get_stream_player(audio_stream)
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music_stream_player.volume_db = stream_player.volume_db
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music_stream_player.max_polyphony = stream_player.max_polyphony
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music_stream_player.pitch_scale = stream_player.pitch_scale
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music_stream_player.play.call_deferred(playback_position)
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func _reparent_music_player( stream_player : AudioStreamPlayer ):
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var playback_position := stream_player.get_playback_position() + AudioServer.get_time_since_last_mix()
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stream_player.owner = null
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stream_player.reparent.call_deferred(self)
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stream_player.play.call_deferred(playback_position)
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func _node_matches_checks( node : Node ) -> bool:
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return node is AudioStreamPlayer and node.autoplay and node.bus == audio_bus
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func _on_removed_music_player( node: Node ) -> void:
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if music_stream_player == node:
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if node.owner == null:
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_clone_music_player(node)
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else:
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_reparent_music_player(node)
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if node.tree_exiting.is_connected(_on_removed_music_player.bind(node)):
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node.tree_exiting.disconnect(_on_removed_music_player.bind(node))
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func _on_added_music_player( node: Node ) -> void:
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if node == music_stream_player : return
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if not (_node_matches_checks(node)) : return
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play_stream_player(node)
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func _enter_tree() -> void:
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AudioServer.add_bus()
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blend_audio_bus_idx = AudioServer.bus_count - 1
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blend_audio_bus = AppSettings.SYSTEM_BUS_NAME_PREFIX + BLEND_BUS_PREFIX + audio_bus
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AudioServer.set_bus_send(blend_audio_bus_idx, audio_bus)
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AudioServer.set_bus_name(blend_audio_bus_idx, blend_audio_bus)
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var tree_node = get_tree()
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if not tree_node.node_added.is_connected(_on_added_music_player):
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tree_node.node_added.connect(_on_added_music_player)
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func _exit_tree():
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var tree_node = get_tree()
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if tree_node.node_added.is_connected(_on_added_music_player):
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tree_node.node_added.disconnect(_on_added_music_player)
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