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import numpy as np
#np.set_printoptions(threshold=np.nan)
import picamera
import picamera.array
import sys
import os
import time
import mmap

##>> Gain access to MMAP
##------------------------------------------------------------------------------------------------------
INDATAFILENAME = '/home/pi/ExPlat/input.dat'
LENGTHDATAMAP = 1024
inDataFile = open(INDATAFILENAME, 'r+')
inDataNo = inDataFile.fileno()
inDataMap = mmap.mmap(inDataNo, LENGTHDATAMAP, access=mmap.ACCESS_WRITE)
s = 0;

##>> Analyze Numpy Array and Print Motion Vector Data
##------------------------------------------------------------------------------------------------------
class AnalyzeArray(picamera.array.PiMotionAnalysis):
    def analyse(self, a):
            global s
            global inDataMap
            s += a[20,15][0]
            #print s
            inDataMap.seek(0)
            inDataMap.write('%d' %s + '\n')

##>> Start Capture and call AnalyzeArray after every frame
##------------------------------------------------------------------------------------------------------
def get_values():
    with picamera.PiCamera() as camera:
        with AnalyzeArray(camera) as output:
            camera.resolution = (640, 480)
            camera.framerate = (20, 1)
            camera.start_recording(
                '/dev/null', format='h264', motion_output=output)
            camera.wait_recording(0)
            camera.stop_recording()