Support frame delay

assets/graphics/misc/musical_note.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dfjd72smxp6ma"
+path="res://.godot/imported/musical_note.png-f1be7cc6341733e6ffe2fa5b650b80c2.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/graphics/misc/musical_note.png"
+dest_files=["res://.godot/imported/musical_note.png-f1be7cc6341733e6ffe2fa5b650b80c2.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

src/Autoload/Export.gd

@@ -282,7 +282,7 @@ func process_animation(project := Global.current_project) -> void:
 			for cel in frame.cels:
 				var image := Image.new()
 				image.copy_from(cel.get_image())
-				var duration := frame.duration * (1.0 / project.fps)
+				var duration := frame.get_duration_in_seconds(project.fps)
 				processed_images.append(
 					ProcessedImage.new(image, project.frames.find(frame), duration)
 				)
@@ -298,7 +298,7 @@ func process_animation(project := Global.current_project) -> void:
 				image.copy_from(crop)
 			if trim_images:
 				image = image.get_region(image.get_used_rect())
-			var duration := frame.duration * (1.0 / project.fps)
+			var duration := frame.get_duration_in_seconds(project.fps)
 			processed_images.append(ProcessedImage.new(image, project.frames.find(frame), duration))
 
 

src/Classes/Frame.gd

@@ -11,3 +11,17 @@ var user_data := ""  ## User defined data, set in the frame properties.
 func _init(_cels: Array[BaseCel] = [], _duration := 1.0) -> void:
 	cels = _cels
 	duration = _duration
+
+
+func get_duration_in_seconds(fps: float) -> float:
+	return duration * (1.0 / fps)
+
+
+func position_in_seconds(project: Project, start_from := 0) -> float:
+	var pos := 0.0
+	for i in range(start_from, project.frames.size()):
+		var frame := project.frames[i]
+		if frame == self:
+			break
+		pos += frame.get_duration_in_seconds(project.fps)
+	return pos

src/UI/Timeline/CelButton.gd

@@ -404,10 +404,10 @@ func _sort_cel_indices_by_frame(a: Array, b: Array) -> bool:
 
 
 func _is_playing_audio() -> void:
-	var layer := Global.current_project.layers[layer] as AudioLayer
-	var audio_length := layer.audio.get_length()
-	var final_frame := audio_length * Global.current_project.fps
-	if frame < final_frame:
-		cel_texture.texture = preload("res://assets/graphics/icons/icon.png")
+	var frame_class := Global.current_project.frames[frame]
+	var layer_class := Global.current_project.layers[layer] as AudioLayer
+	var audio_length := layer_class.audio.get_length()
+	if frame_class.position_in_seconds(Global.current_project) < audio_length:
+		cel_texture.texture = preload("res://assets/graphics/misc/musical_note.png")
 	else:
 		cel_texture.texture = null

src/UI/Timeline/FrameButton.gd

@@ -19,8 +19,9 @@ func _ready() -> void:
 
 
 func _update_tooltip() -> void:
-	var duration := Global.current_project.frames[frame].duration
-	var duration_sec := duration * (1.0 / Global.current_project.fps)
+	var frame_class := Global.current_project.frames[frame]
+	var duration := frame_class.duration
+	var duration_sec := frame_class.get_duration_in_seconds(Global.current_project.fps)
 	var duration_str := str(duration_sec)
 	if "." in duration_str:  # If its a decimal value
 		duration_str = "%.2f" % duration_sec  # Up to 2 decimal places

src/UI/Timeline/LayerButton.gd

@@ -89,11 +89,10 @@ func _play_audio() -> void:
 	if not layer.visible:
 		return
 	var audio_length := audio_player.stream.get_length()
-	var final_frame := audio_length * Global.current_project.fps
-	if Global.current_project.current_frame < final_frame:
-		var seconds_per_frame := 1.0 / Global.current_project.fps
-		var playback_position := Global.current_project.current_frame * seconds_per_frame
-		audio_player.play(playback_position)
+	var frame := Global.current_project.frames[Global.current_project.current_frame]
+	var frame_pos := frame.position_in_seconds(Global.current_project)
+	if frame_pos < audio_length:
+		audio_player.play(frame_pos)
 	else:
 		audio_player.stop()