From dfc9765f09f56f63722a446d95e1a61e46b3fb39 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Wed, 6 Apr 2022 13:50:00 +0200
Subject: Fixing data stream capture

---
 src/argaze/TobiiGlassesPro2/TobiiData.py  | 32 +++++++++++++------------------
 src/argaze/TobiiGlassesPro2/TobiiVideo.py |  2 --
 src/argaze/utils/live_tobii_session.py    |  9 ++++++---
 3 files changed, 19 insertions(+), 24 deletions(-)

(limited to 'src')

diff --git a/src/argaze/TobiiGlassesPro2/TobiiData.py b/src/argaze/TobiiGlassesPro2/TobiiData.py
index 09afd33..42042ef 100644
--- a/src/argaze/TobiiGlassesPro2/TobiiData.py
+++ b/src/argaze/TobiiGlassesPro2/TobiiData.py
@@ -21,13 +21,13 @@ class TobiiSegmentData(DataStructures.DictObject):
         ts_data_buffer_dict = {}
 
         # define a decoder function
-        def decode(json_item):
+        def decode(json_data):
 
             # accept only valid data (e.g. with status value equal to 0)
-            if json_item.pop('s', -1) == 0:
+            if json_data.pop('s', -1) == 0:
 
                 # convert timestamp
-                ts = json_item.pop('ts')
+                ts = json_data.pop('ts')
 
                 # keep first timestamp to offset all timestamps
                 if self.__ts_start == 0:
@@ -40,8 +40,8 @@ class TobiiSegmentData(DataStructures.DictObject):
                     return
 
                 # convert json data into data object
-                data_object_type = '_'.join(json_item.keys())
-                data_object = DataStructures.DictObject(data_object_type, **json_item)
+                data_object_type = '_'.join(json_data.keys())
+                data_object = DataStructures.DictObject(data_object_type, **json_data)
 
                 # append a dedicated timestamped buffer for each data object type
                 if data_object.get_type() not in ts_data_buffer_dict.keys():
@@ -82,8 +82,6 @@ class TobiiDataStream(threading.Thread):
         self.__stop_event = threading.Event()
         self.__read_lock = threading.Lock() 
 
-        self.__sleep = 1. / self.__network.get_et_freq()
-
         # prepare keep alive message
         self.__keep_alive_msg = "{\"type\": \"live.data.unicast\", \"key\": \""+ str(uuid.uuid4()) +"\", \"op\": \"start\"}"
         self.__keep_alive_thread = threading.Thread(target = self.__keep_alive)
@@ -124,15 +122,13 @@ class TobiiDataStream(threading.Thread):
 
         while not self.__stop_event.isSet():
 
-            # wait
-            time.sleep(self.__sleep)
-
             # lock data queue access
             self.__read_lock.acquire()
 
             # write in data queue
             data = self.__network.grab_data(self.__data_socket)
-            self.__data_queue.put(data)
+            json_data = json.loads(data.decode('utf-8'))
+            self.__data_queue.put(json_data)
 
             # unlock data queue access
             self.__read_lock.release()
@@ -152,17 +148,15 @@ class TobiiDataStream(threading.Thread):
         # read data queue
         while not self.__data_queue.empty():
 
-            data = self.__data_queue.get()
-
-            json_item = json.loads(data.decode('utf-8'))
+            json_data = self.__data_queue.get()
 
             # accept only valid data (e.g. with status value equal to 0)
-            if json_item.pop('s', -1) == 0:
+            if json_data.pop('s', -1) == 0:
 
                 # convert timestamp
-                ts = json_item.pop('ts')
+                ts = json_data.pop('ts')
 
-                #print(f'json_item at {ts}: {json_item}')
+                #print(f'json_data at {ts}: {json_data}')
                 '''
                 # keep first timestamp to offset all timestamps
                 if self.__ts_start == 0:
@@ -175,8 +169,8 @@ class TobiiDataStream(threading.Thread):
                     break
                 '''
                 # convert json data into data object
-                data_object_type = '_'.join(json_item.keys())
-                data_object = DataStructures.DictObject(data_object_type, **json_item)
+                data_object_type = '_'.join(json_data.keys())
+                data_object = DataStructures.DictObject(data_object_type, **json_data)
 
                 # append a dedicated timestamped buffer for each data object type
                 if data_object.get_type() not in ts_data_buffer_dict.keys():
diff --git a/src/argaze/TobiiGlassesPro2/TobiiVideo.py b/src/argaze/TobiiGlassesPro2/TobiiVideo.py
index 748967a..57d64d0 100644
--- a/src/argaze/TobiiGlassesPro2/TobiiVideo.py
+++ b/src/argaze/TobiiGlassesPro2/TobiiVideo.py
@@ -80,8 +80,6 @@ class TobiiVideoStream(threading.Thread):
 
         self.__frame_tuple = None
 
-        self.__sleep = 1. / self.__network.get_video_freq()
-
         # prepare keep alive message
         self.__keep_alive_msg = "{\"type\": \"live.video.unicast\",\"key\": \""+ str(uuid.uuid4()) +"_video\",  \"op\": \"start\"}"
         self.__keep_alive_thread = threading.Timer(0, self.__keep_alive)
diff --git a/src/argaze/utils/live_tobii_session.py b/src/argaze/utils/live_tobii_session.py
index 0181e23..c78f058 100644
--- a/src/argaze/utils/live_tobii_session.py
+++ b/src/argaze/utils/live_tobii_session.py
@@ -43,15 +43,18 @@ def main():
             video_ts, video_frame = tobii_video_stream.read()
                 
             try:
-                
+
+                # read data stream
+                data_stream = tobii_data_stream.read()
+
                 # get last gaze position
-                last_ts, last_gaze_position = tobii_data_stream.read().gidx_l_gp.pop_last()
+                last_ts, last_gaze_position = data_stream.gidx_l_gp.pop_last()
 
                 # Draw tobii gaze pointer
                 pointer = (int(last_gaze_position.gp[0] * video_frame.width), int(last_gaze_position.gp[1] * video_frame.height))
                 cv.circle(video_frame.matrix, pointer, 4, (0, 255, 255), -1)
 
-            # when gidx_l_gp key not received during last frame
+            # when gidx_l_gp key not in data stream
             except (KeyError, AttributeError):
                 pass
             
-- 
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