From ed215e841a41735e483abbcbc6f6e9a4c5cafb77 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Mon, 22 Jul 2024 18:26:57 +0200
Subject: Don't process gaze positions while no camera image have processed
 when sync_event is required.

---
 src/argaze/utils/contexts/TobiiProGlasses2.py | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/argaze/utils/contexts/TobiiProGlasses2.py b/src/argaze/utils/contexts/TobiiProGlasses2.py
index 13dcf4a..b8810ae 100644
--- a/src/argaze/utils/contexts/TobiiProGlasses2.py
+++ b/src/argaze/utils/contexts/TobiiProGlasses2.py
@@ -1171,6 +1171,7 @@ class SegmentPlayback(ArFeatures.DataPlaybackContext):
 		self.__sync_event_unit = None
 		self.__sync_event_factor = None
 		self.__sync_data_ts = None
+		self.__sync_video_ts = None
 		self.__sync_ts = None
 		self.__last_sync_data_ts = None
 		self.__last_sync_ts = None
@@ -1303,13 +1304,16 @@ class SegmentPlayback(ArFeatures.DataPlaybackContext):
 
 			logging.debug('> read image at %i timestamp', video_ts)
 
-			# Don't process images if sync is required but sync event not happened yet
-			if self.__sync_event is not None and self.__sync_ts is not None:
+			# if sync is required 
+			if self.__sync_event is not None:
 
-				sync_video_ts = int(self.__sync_ts + video_ts - self.__sync_data_ts)
+				# Wait for a first sync event
+				if self.__sync_ts is not None:
 
-				# Process camera image
-				self._process_camera_image(timestamp=sync_video_ts, image=video_image)
+					self.__sync_video_ts = int(self.__sync_ts + video_ts - self.__sync_data_ts)
+
+					# Process camera image
+					self._process_camera_image(timestamp=self.__sync_video_ts, image=video_image)
 
 			# Otherwise, always process images
 			elif self.__sync_event is None:
@@ -1360,8 +1364,13 @@ class SegmentPlayback(ArFeatures.DataPlaybackContext):
 								
 									logging.info('Difference between data and sync event timestamps is %i ms', diff_data_ts-diff_sync_ts)
 
+				# Don't process gaze positions if sync is required but no image have been processed yet
+				if self.__sync_event is not None and self.__sync_video_ts is None:
+
+					continue
+
 				# Don't process gaze positions if sync is required but sync event not happened yet
-				if self.__sync_event is not None and self.__sync_ts is None:
+				elif self.__sync_event is not None and self.__sync_ts is None:
 
 					continue
 
-- 
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