Running Pigo in Python example

examples/python/demo.py

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+from ctypes import *
+
+import subprocess
+import numpy
+import os
+import cv2
+import time
+
+os.system('go build -o pigo.so -buildmode=c-shared pigo.go')
+pigo = cdll.LoadLibrary('./pigo.so')
+os.system('rm pigo.so')
+
+MAX_NDETS = 2048
+
+# define class GoPixelSlice to map to:
+# C type struct { void *data; GoInt len; GoInt cap; }
+class GoPixelSlice(Structure):
+	_fields_ = [
+		("pixels", POINTER(c_ubyte)), ("len", c_longlong), ("cap", c_longlong),
+	]
+
+def process_frame(pixs):
+	dets = numpy.zeros(3*MAX_NDETS, dtype=numpy.float32)
+	pixs = pixs.flatten()
+	pixels = cast((c_ubyte * len(pixs))(*pixs), POINTER(c_ubyte))
+	
+	# call FindFaces
+	faces = GoPixelSlice(pixels, len(pixs), len(pixs))
+	pigo.FindFaces.argtypes = [GoPixelSlice]
+	pigo.FindFaces.restype = c_void_p
+	#pigo.FindFaces.restype = POINTER((c_longlong * 3) * MAX_NDETS)
+	#pigo.FindFaces.restype = numpy.ctypeslib.ndpointer(dtype = c_longlong, shape = (MAX_NDETS, 3, ))
+
+	ndets = pigo.FindFaces(faces)
+	data_pointer = cast(ndets, POINTER((c_longlong * 3) * MAX_NDETS))
+	
+	if data_pointer :
+		#print(data_pointer.contents)
+		#addr = addressof(data_pointer.contents)
+		#new_array =  cast(addr, POINTER((c_longlong * 3) * MAX_NDETS)).contents
+		new_array = ((c_longlong * 3) * MAX_NDETS).from_address(addressof(data_pointer.contents))
+		# new_array = numpy.ctypeslib.as_array(data_pointer,shape=(8192,))
+
+		# buffer = numpy.core.multiarray.int_asbuffer(addressof(new_array), 3*MAX_NDETS)
+		# a = numpy.frombuffer(buffer, int)
+		# print(a)
+
+		res = numpy.ndarray(buffer=new_array, dtype=c_longlong, shape=(MAX_NDETS, 3,))
+		dets_len = res[0][0]
+		print(dets_len)
+		res = numpy.delete(res, 0, 0)
+		#print(res)
+		dets = numpy.frombuffer(data_pointer.contents, dtype=numpy.dtype(int))
+		dets = numpy.trim_zeros(dets)
+		#dets = dets.astype(int)
+		#print(dets)
+
+		dets = list(res.reshape(-1, 3))[0:dets_len]
+
+		return dets
+		#print(dets)
+	#print(dets)
+	#return list(dets.reshape(-1, 4))[0:dets]
+	
+	#res = pigo.FindFaces(pixels, gray.shape[0], gray.shape[1], cascade)
+	#print(res.dets)
+
+cap = cv2.VideoCapture(0)
+cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
+cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)
+
+w = cap.get(cv2.CAP_PROP_FRAME_WIDTH)
+h = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
+print (w,h)
+
+while(True):
+	ret, frame = cap.read()
+	pixs = numpy.ascontiguousarray(frame[:, :, 1].reshape((frame.shape[0], frame.shape[1])))
+
+	if not numpy.any(pixs):
+		continue
+
+	dets = process_frame(pixs) # pixs needs to be numpy.uint8 array
+	print(dets)
+	if dets is not None:
+		for det in dets:
+			cv2.circle(frame, (int(det[1]), int(det[0])), int(det[2]/2.0), (0, 0, 255), 2)
+
+	cv2.imshow('', frame)
+	
+	if cv2.waitKey(5) & 0xFF == ord('q'):
+		break
+
+cap.release()
+cv2.destroyAllWindows()