❇️ Create Conductor music module

Main.tscn

@@ -0,0 +1,8 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Scenes/Conductor.tscn" type="PackedScene" id=1]
+
+[node name="Main" type="Node2D"]
+
+[node name="Conductor" parent="." instance=ExtResource( 1 )]
+song_offset = 200000.0

Scenes/Conductor.tscn

@@ -0,0 +1,12 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Scripts/Conductor.gd" type="Script" id=1]
+
+
+
+
+
+[node name="Conductor" type="Node"]
+script = ExtResource( 1 )
+
+[node name="Music" type="AudioStreamPlayer" parent="."]

Scripts/Conductor.gd

@@ -0,0 +1,60 @@
+extends Node
+class_name Conductor
+# The Conductor (optionally) plays a song, and sends signals based on the beats of the song.
+
+# The beats per minute of the song
+export(float, 1, 500) var song_bpm: float = 120
+
+# Microseconds of silence present in the song
+export(float, 0, 1000000) var song_offset: float = 0
+
+# The time the song started playing at
+var start_time: int
+
+# The time of the last beat
+var last_beat: int
+
+# A song beat
+signal beat
+
+
+# Calculate the microseconds per beat
+func usec_per_beat():
+	return 60000000 / song_bpm
+
+
+# Returns microseconds since the song start
+func song_time():
+	var current_time: int = OS.get_ticks_usec()
+	return current_time - start_time
+	
+# Return corrected microseconds (after applying the offset) since the song start
+func corrected_time():
+	var song_time = song_time()
+	return song_time - song_offset
+
+
+# Start playing the song
+func play():
+	start_time = OS.get_ticks_usec()
+	$Music.play()
+
+
+# Signal that a beat has happened
+func beat():
+	pass
+
+
+func _ready():
+	play()
+
+
+func _process(delta):
+	var time = corrected_time()
+	if time - last_beat >= usec_per_beat():
+		emit_signal("beat")
+		last_beat = time
+
+
+func _on_Conductor_beat():
+	print("Beat! %f" % song_time())

project.godot

@@ -8,14 +8,20 @@
 
 config_version=4
 
-_global_script_classes=[  ]
+_global_script_classes=[ {
+"base": "Node",
+"class": "Conductor",
+"language": "GDScript",
+"path": "res://Scripts/Conductor.gd"
+} ]
 _global_script_class_icons={
-
+"Conductor": ""
 }
 
 [application]
 
 config/name="ld47"
+run/main_scene="res://Main.tscn"
 
 [rendering]