Add a BPM sync tutorial.

Author: reduz

audio/bpm_sync/Control.gd

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+extends Panel
+
+const BPM = 116
+const BARS = 4
+
+var playing = false
+const COMPENSATE_FRAMES = 2
+const COMPENSATE_HZ = 60.0
+
+func strsec(secs):
+	var s = str(secs)
+	if (s.length()==1):
+		s="0"+s
+	return s
+	
+# warning-ignore:unused_argument
+func _process(delta):
+	if (!playing or !$Player.playing):
+		return
+	
+	var time = $Player.get_mix_time() + AudioServer.get_time_since_last_mix() - AudioServer.get_output_latency() + (1/COMPENSATE_HZ)*COMPENSATE_FRAMES
+		
+	var beat = int(time * BPM / 60.0)
+	var seconds = int(time)
+	var seconds_total = int($Player.stream.get_length())
+	$Label.text = str("BEAT: ",beat % BARS +1,"/",BARS," TIME: ",seconds/60,":",strsec(seconds%60)," / ",seconds_total/60,":",strsec(seconds_total%60))
+	
+
+func _on_Button_pressed():
+	print(AudioServer.get_output_latency())
+	playing=true
+	$Player.play()
+

audio/bpm_sync/lcd.ttf

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/play_button.png-c6659eb2fbf2022d9e670864776e465a.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://play_button.png"
+dest_files=[ "res://.import/play_button.png-c6659eb2fbf2022d9e670864776e465a.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

audio/bpm_sync/play_button.png

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/play_button_hl.png-63644aa33cad39ca169b518c7eed7ae2.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://play_button_hl.png"
+dest_files=[ "res://.import/play_button_hl.png-63644aa33cad39ca169b518c7eed7ae2.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

audio/bpm_sync/play_button.png.import

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+[gd_scene load_steps=7 format=2]
+
+[ext_resource path="res://the_comeback2.ogg" type="AudioStream" id=1]
+[ext_resource path="res://Control.gd" type="Script" id=2]
+[ext_resource path="res://lcd.ttf" type="DynamicFontData" id=3]
+[ext_resource path="res://play_button.png" type="Texture" id=4]
+
+[sub_resource type="StyleBoxFlat" id=1]
+bg_color = Color( 0, 0, 0, 1 )
+
+[sub_resource type="DynamicFont" id=2]
+size = 40
+outline_size = 2
+outline_color = Color( 0.588235, 0.886275, 0.435294, 0.239216 )
+font_data = ExtResource( 3 )
+
+[node name="Control" type="Panel"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+custom_styles/panel = SubResource( 1 )
+script = ExtResource( 2 )
+
+[node name="Label" type="Label" parent="."]
+margin_left = 106.895
+margin_top = 427.158
+margin_right = 914.895
+margin_bottom = 488.158
+custom_fonts/font = SubResource( 2 )
+custom_colors/font_color = Color( 0.552941, 0.984314, 0.501961, 1 )
+align = 1
+
+[node name="Button" type="TextureButton" parent="."]
+margin_left = 433.316
+margin_top = 244.158
+margin_right = 561.316
+margin_bottom = 372.158
+texture_normal = ExtResource( 4 )
+texture_pressed = ExtResource( 4 )
+
+[node name="Player" type="AudioStreamPlayer" parent="."]
+stream = ExtResource( 1 )
+[connection signal="pressed" from="Button" to="." method="_on_Button_pressed"]

audio/bpm_sync/play_button_hl.png

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=4
+
+_global_script_classes=[  ]
+_global_script_class_icons={
+
+}
+
+[application]
+
+run/main_scene="res://player.tscn"

audio/bpm_sync/play_button_hl.png.import

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+[remap]
+
+importer="ogg_vorbis"
+type="AudioStreamOGGVorbis"
+path="res://.import/the_comeback2.ogg-4b85e06ff00ff611cbd6022fc43aade8.oggstr"
+
+[deps]
+
+source_file="res://the_comeback2.ogg"
+dest_files=[ "res://.import/the_comeback2.ogg-4b85e06ff00ff611cbd6022fc43aade8.oggstr" ]
+
+[params]
+
+loop=true
+loop_offset=0