AudioStreamPlayer with a counter, which counts the seconds elapsed and emits a signal each second

audio_stream_player_with_counter.gd

extends AudioStreamPlayer
class_name AudioStreamPlayerWithCounter

signal playback_position_reached(number)

var counter: int
var previous_counter: int


func _ready() -> void:
	if not stream:
		set_process(false)


func _process(_delta: float) -> void:
	counter = int(get_playback_position())

	if previous_counter != counter:
		previous_counter = counter
		emit_signal("playback_position_reached", counter)

Example:

func _on_AudioStreamPlayerWithCounter_playback_position_reached(number: int) -> void:
	if number == 10:
		# do something