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video_stream.py
48 lines (39 loc) · 1.42 KB
/
video_stream.py
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import cv2
import urllib.request
import numpy as np
import threading
import logging
logger = logging.getLogger(__name__)
class VideoStream:
def __init__(self, addr: str): # 'http://192.168.0.6:9999/stream'
self.addr = addr
self.enabled = False
self._frame = b''
def _receive_video(self):
stream = urllib.request.urlopen(self.addr)
bin_data = b''
timeout = 1
while self.enabled:
bin_data += stream.read(1024)
a = bin_data.find(b'\xff\xd8')
b = bin_data.find(b'\xff\xd9')
if a != -1 and b != -1:
jpg = bin_data[a:b+2]
bin_data = bin_data[b+2:]
img_data = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8), cv2.IMREAD_COLOR)
self._frame = cv2.imencode('.ppm', img_data)[1].tobytes()
def enable(self):
if self.enabled:
logger.warning("Unable to enable video stream. Already enabled")
else:
self.video_thread = threading.Thread(target=self._receive_video)
self.video_thread.start()
self.enabled = True
def disable(self):
if not self.enabled:
logger.warning("Unable to disable video stream. Already disabled")
else:
self.enabled = False
self.video_thread.join() # TODO what if it hangs?
def get_frame(self):
return self._frame