blakeblackshear.frigate/frigate/mqtt.py

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import json
import cv2
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import threading
import prctl
from collections import Counter, defaultdict
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import itertools
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class MqttObjectPublisher(threading.Thread):
def __init__(self, client, topic_prefix, camera):
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threading.Thread.__init__(self)
self.client = client
self.topic_prefix = topic_prefix
self.camera = camera
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def run(self):
prctl.set_name(self.__class__.__name__)
current_object_status = defaultdict(lambda: 'OFF')
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while True:
# wait until objects have been tracked
with self.camera.objects_tracked:
self.camera.objects_tracked.wait()
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# count objects with more than 2 entries in history by type
obj_counter = Counter()
for obj in self.camera.object_tracker.tracked_objects.values():
if len(obj['history']) > 1:
obj_counter[obj['name']] += 1
# report on detected objects
for obj_name, count in obj_counter.items():
new_status = 'ON' if count > 0 else 'OFF'
if new_status != current_object_status[obj_name]:
current_object_status[obj_name] = new_status
self.client.publish(self.topic_prefix+'/'+obj_name, new_status, retain=False)
# send the snapshot over mqtt if we have it as well
if obj_name in self.camera.best_frames.best_frames:
best_frame = cv2.cvtColor(self.camera.best_frames.best_frames[obj_name], cv2.COLOR_RGB2BGR)
ret, jpg = cv2.imencode('.jpg', best_frame)
if ret:
jpg_bytes = jpg.tobytes()
self.client.publish(self.topic_prefix+'/'+obj_name+'/snapshot', jpg_bytes, retain=True)
# expire any objects that are ON and no longer detected
expired_objects = [obj_name for obj_name, status in current_object_status.items() if status == 'ON' and not obj_name in obj_counter]
for obj_name in expired_objects:
current_object_status[obj_name] = 'OFF'
self.client.publish(self.topic_prefix+'/'+obj_name, 'OFF', retain=False)