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Old 11-02-2016, 08:12 AM
VizMars VizMars is offline
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Join Date: Jan 2016
Posts: 40
Timing problem

Hi!
Please find attached a part of my code.
I use a EyeLink 1000 and so "el" stands for eyelink and represents the eyetracker object [el = pylink.EyeLink()]. The variable "ball" is a .osgb-file with a size of 25mb.
The function do_trial is called every trial in my experiment. I want the sound to be played 2 seconds after the ball appeared. But in the first trial of each block (and only in the first) the ball appears after the sound is played, otherwise it works just fine.
Does anybody know why this happens?

Code:
def el_rec_thread():
	while True:		
		#check recording status
		error = el.isRecording()  # First check if recording is aborted 
		if error != 0:
			end_el_trial()
			return error
			
		if inspect_over:				
			end_el_trial()	
			break
			
		#check if break pressed
		if(el.breakPressed()):	# Checks for program termination or ALT-F4 or CTRL-C keys
			end_el_trial()
			return pl.ABORT_EXPT
			
def end_el_recording(participant_id, block_num, trial):
	global inspect_over
	
	sound.play()
	optitrack.set_phase(POST_SOUND)
	msg_end = "%s Block %d Trial %d Ende %d" % ( participant_id, block_num, trial, int(round(viz.tick()*1000)) )   
	el.sendMessage(msg_end)
	inspect_over = True
	
def end_el_trial():
	'''Ends recording: adds 100 msec of data to catch final events'''
	pl.endRealTimeMode()  
	pl.pumpDelay(100)	   
	el.stopRecording()
	while el.getkey() : 
		pass

def do_trial(participant_id, block_num, trial, scale, distance):
	global inspect_over
	
	inspect_over = False 
	answer = -1 # set initial value to -1
		
	#optitrack.set_block(block_num)
	#optitrack.set_trial(trial)
	
	#This supplies the title of the current trial at the bottom of the eyetracker display
	msg_rec_status = "record_status_message 'Block %d, Trial %d/%d'" % (block_num, trial, N_TRIALS_EXC if (block_num == 0) else N_TRIALS_EXP)
	el.sendCommand(msg_rec_status)
	
	#defines the trial variables
	#MUST be sent to the EyeLink data file PRIOR TO the Trial Start message ("TRIALID ...")
	msg_trial_var = "TRIAL_VAR_LABELS %s %s %s" % ("Participant_ID", "Block_number", "Trial") 
	el.sendMessage(msg_trial_var)
	
	#Always send a TRIALID message before starting to record.
	#EyeLink Data Viewer defines the start of a trial by the TRIALID message.  
	#This message is different than the start of recording message START that is logged when the trial recording begins. 
	#The Data viewer will not parse any messages, events, or samples, that exist in the data file prior to this message.
	msg_trial_id = "TRIALID %s Block %d Trial %d" % (participant_id, block_num, trial) 
	el.sendMessage(msg_trial_id)
	
#	#Does drift correction and handles the re-do camera setup situations
#	###############################################################################
#	drift_target.visible(viz.ON)
#	yield viztask.waitFrame(1) #wait for the next frame to be drawn
#	while True:			
#		#Checks whether we are still connected to the tracker
#		if not el.isConnected():		 
#			viztask.returnValue(pl.ABORT_EXPT) 			
#		try:
#			error = el.doDriftCorrect(MONITOR_WIDTH // 2, MONITOR_HEIGHT // 2, 0, 0)			
#			if error == 0: 
#				break # if drift correction OK go on 				
#		except: # if re-calibration is necessary			
#			pl.openGraphics( (MONITOR_WIDTH, MONITOR_HEIGHT), 32 )
#			el.doTrackerSetup()    
#			pl.closeGraphics()	
#			break
#	drift_target.visible(viz.OFF)
#	###############################################################################
	
	#switch tracker to ide and give it time to complete mode switch
	el.setOfflineMode()
	pl.msecDelay(50) 
	
	#send trial variable data sometime in BETWEEN the TRIALID and TRIAL_RESULT messages
	msg_trial_data = "!V TRIAL_VAR_DATA %s %d %d" % (participant_id, block_num, trial)
	el.sendMessage(msg_trial_data)

	##start recording samples and events to edf file and over the link.
	#error = el.startRecording(1, 1, 1, 1)
	
	#start recording samples and events to edf file
	error = el.startRecording(1, 1, 0, 0)
	if(error != 0):	viztask.returnValue(error)
	#disable python garbage collection to avoid delays
	gc.disable()
	#begin the realtime mode
	pl.beginRealTimeMode(100)
	eye_used = el.eyeAvailable() #determine which eye(s) are available 
	if eye_used == BINOCULAR:		
		el.sendMessage("EYE_USED: 2 BOTH")
	else:
		print ("Error, not both eyes used!")
		viztask.returnValue(pl.TRIAL_ERROR)
		
	ball.setPosition( [0, 0, -distance] )  
	ball.setScale( [scale]*3 )	
	#determine trial start time	
	startTime = viz.tick()	
	ball.visible(viz.ON)
	#determine delay of the actual stimulus onset	
	drawTime = int( round((viz.tick() - startTime) * 1000) )	
	msg_start = "%s Block %d Trial %d Start %d" % ( participant_id, block_num, trial, int(round(viz.tick()*1000)) ) 
	el.sendMessage(msg_start)	
	el.sendMessage("SYNCTIME %d" %drawTime)		

	#reset keys and buttons on tracker
	el.flushKeybuttons(0)
	
	vizact.ontimer2(2, 0, end_el_recording, participant_id, block_num, trial) # repeats = Number of times to repeat the timer. If 0, the timer will be called only once
	rec_data = yield viztask.waitDirector(el_rec_thread)
	if rec_data.returnValue != None: # if not trial-over-case
		viztask.returnValue(rec_data.returnValue)
	
	#the call to the getRecordingStatus() method makes sure that 
	#no Abort menu operations remain to be performed, and generates the trial return code
	ret_value = el.getRecordingStatus()
	
	pl.endRealTimeMode()	
	
	
	###### etc ...
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