the-screenless-office/screenless/bureau/photography/photography.py

import subprocess
import tempfile

from pyA20.gpio import gpio, port

from bureau import Bureau, add_api


class Photography(Bureau):
    """
    The Photography dept. provides document camera and other image
    capture services for other bureaus.
    """

    name = "Photography Dept."
    prefix = "PX"
    version = 0
    doc_light_pin = port.PG0

    def __init__(self):
        Bureau.__init__(self)
        
        # set up the gpios for lamp & knobs
        gpio.init()
        gpio.pullup(self.doc_light_pin, 0)  # reset pullup state
        gpio.pullup(self.doc_light_pin, gpio.PULLDOWN)


    def _doc_light_on(self):
        gpio.output(self.doc_light_pin, gpio.HIGH)

    def _doc_light_off(self):
        gpio.output(self.doc_light_pin, gpio.LOW)

    @add_api("photo", "Get Document Photo")
    def photo(self):
        """
        Takes a photograph using the document camera.  Returns
        the file name.
        """
        self._doc_light_on()
        tmpimg = tempfile.NamedTemporaryFile(suffix=".jpg", delete=False)
        tmpimg.close()

        # TODO: make more reliable
        # TODO: make resolution config variable
        # this is a dirty hack to keep the webcam system calls from hanging
        #cmd1 = "fswebcam --jpeg 95 --no-banner --resolution 320x240 /dev/null"
        #cmd2 = "fswebcam --jpeg 95 --no-banner --resolution 1920x1080 "
        #cmd2 += "-F 2 -S 1" + tmpimg.name
        #cmd1 = "uvccapture -d/dev/video1 -x320 -y240 -o /dev/null"
        cmd2 = "uvccapture -d/dev/video1 -D2 -m -x3264 -y2448 -o" + tmpimg.name
        #subprocess.check_output(cmd1.split())
        subprocess.check_output(cmd2.split())
        self._doc_light_off()
        return {"photo": tmpimg.name}


def main():
    px = Photography()
    px.run()


if __name__ == "__main__":
    main()