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#!/usr/bin/env python
import threading
import uuid
import time
import copy
from argaze import DataStructures
from argaze.TobiiGlassesPro2 import TobiiNetworkInterface
import av
import numpy
class TobiiVideoFrame(DataStructures.DictObject):
"""Define tobii video frame"""
def __init__(self, matrix, width, height, pts):
super().__init__(type(self).__name__, **{'matrix': matrix, 'width': width, 'height': height, 'pts': pts})
class TobiiVideoSegment():
"""Handle Tobii Glasses Pro 2 segment video file."""
def __init__(self, segment_video_path):
"""Load segment video from segment directory"""
self.__segment_video_path = segment_video_path
self.__container = av.open(self.__segment_video_path)
self.__stream = self.__container.streams.video[0]
self.__width = int(cv.VideoCapture(self.__segment_video_path).get(cv.CAP_PROP_FRAME_WIDTH))
self.__height = int(cv.VideoCapture(self.__segment_video_path).get(cv.CAP_PROP_FRAME_HEIGHT))
def get_path(self):
return self.__segment_video_path
def get_duration(self):
return float(self.__stream.duration * self.__stream.time_base)
def get_frame_number(self):
return self.__stream.frames
def get_width(self):
return self.__width
def get_height(self):
return self.__height
def frames(self):
return self.__iter__()
def __iter__(self):
# start decoding
self.__container.decode(self.__stream)
return self
def __next__(self):
frame = self.__container.decode(self.__stream).__next__()
# return micro second timestamp and frame data
return frame.time * 1000000, TobiiVideoFrame(frame.to_ndarray(format='bgr24'), frame.width, frame.height, frame.pts)
class TobiiVideoStream(threading.Thread):
"""Capture Tobii Glasses Pro 2 video camera stream."""
def __init__(self, network_interface: TobiiNetworkInterface.TobiiNetworkInterface):
"""Initialise video stream reception."""
threading.Thread.__init__(self)
threading.Thread.daemon = True
self.__network = network_interface
self.__video_socket = self.__network.make_socket()
self.__stop_event = threading.Event()
self.__read_lock = threading.Lock()
self.__frame_tuple = None
# 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)
self.__keep_alive_thread.daemon = True
def __del__(self):
"""Stop data reception before destruction."""
self.close()
def __keep_alive(self):
"""Maintain connection."""
while not self.__stop_event.isSet():
self.__network.send_keep_alive_msg(self.__video_socket, self.__keep_alive_msg)
time.sleep(1)
def open(self):
"""Start data reception."""
self.__keep_alive_thread.start()
threading.Thread.start(self)
def close(self):
"""Stop data reception definitively."""
self.__stop_event.set()
threading.Thread.join(self.__keep_alive_thread)
threading.Thread.join(self)
self.__video_socket.close()
def run(self):
"""Store frame for further reading."""
container = av.open(f'rtsp://{self.__network.get_address()}:8554/live/scene', options={'rtsp_transport': 'tcp'})
stream = container.streams.video[0]
for frame in container.decode(stream):
# quit if the video acquisition thread have been stopped
if self.__stop_event.isSet():
break
# lock frame access
self.__read_lock.acquire()
# store frame time, matrix, width, height and pts into a tuple
self.__frame_tuple = (frame.time, frame.to_ndarray(format='bgr24'), frame.width, frame.height, frame.pts)
# unlock frame access
self.__read_lock.release()
def read(self):
# if the video acquisition thread have been stopped or isn't started
if self.__stop_event.isSet() or self.__frame_tuple == None:
return -1, TobiiVideoFrame(numpy.zeros((1, 1, 3), numpy.uint8), 1, 1, -1)
# lock frame access
self.__read_lock.acquire()
# copy frame tuple
frame_tuple = copy.deepcopy(self.__frame_tuple)
# unlock frame access
self.__read_lock.release()
return frame_tuple[0] * 1000000, TobiiVideoFrame(frame_tuple[1], frame_tuple[2], frame_tuple[3], frame_tuple[4])
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