Kevin
343d0855c7
Main function here is the capture function. All attrs are currently fixed. The server fetches the saved image, in order to not have read/write conflict we first save captured image as 'assets/foo.jpg' and after capture rename it to 'assets/capture.jpg'.
50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
import os
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import time
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import picamera
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import threading
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from datetime import datetime
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from logger import logger
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class BrewCamera():
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def __init__(self, interval=10):
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self.lastCaptureTimestamp = None
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self.interval = interval
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self.warmupTime = 0.3
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def spawnBackgroundCapture(self):
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thread = threading.Thread(target=self.captureOnIntervalForever, args=())
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thread.daemon = True
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thread.start()
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logger.info("spawned camera capture daemon at interval: {}".format(self.interval))
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def captureOnIntervalForever(self):
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while True:
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time.sleep(self.interval - self.warmupTime)
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self.capture()
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def capture(self):
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try:
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logger.debug('Capturing image')
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with picamera.PiCamera() as camera:
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camera.resolution = (1297, 972)
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camera.rotation = 180
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camera.annotate_background = picamera.Color('black')
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camera.annotate_text_size = 50 # (values 6 to 160, default is 32)
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camera.annotate_text = datetime.now().strftime('%A %d %b %Y %H:%M:%S')
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# Camera warm-up time
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time.sleep(self.warmupTime)
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camera.capture('assets/foo.jpg')
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self.lastCaptureTime = datetime.now()
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os.replace('assets/foo.jpg', 'assets/capture.jpg')
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except picamera.exc.PiCameraMMALError as error:
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logger.error('Picamera MMAL exception. Retrying picture in 1 second', es={
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error: str(error),
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exception: error.__class__.__name__
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})
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time.sleep(1)
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self.capture()
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