Add video receiving example

example/recv.py

@@ -0,0 +1,57 @@
+import sys
+import numpy as np
+import cv2 as cv
+import NDIlib as ndi
+
+def main():
+
+    if not ndi.initialize():
+        return 0
+
+    ndi_find = ndi.find_create_v2()
+
+    if ndi_find is None:
+        return 0
+
+    sources = []
+    while not len(sources) > 0:
+        print('Looking for sources ...')
+        ndi.find_wait_for_sources(ndi_find, 1000)
+        sources = ndi.find_get_current_sources(ndi_find)
+
+    ndi_recv_create = ndi.RecvCreateV3()
+    ndi_recv_create.color_format = ndi.RECV_COLOR_FORMAT_BGRX_BGRA
+
+    ndi_recv = ndi.recv_create_v3(ndi_recv_create)
+
+    if ndi_recv is None:
+        return 0
+
+    ndi.recv_connect(ndi_recv, sources[0])
+
+    ndi.find_destroy(ndi_find)
+
+    cv.startWindowThread()
+
+    frame = np.array((1920))
+
+    while True:
+        t,v,_,_ = ndi.recv_capture_v2(ndi_recv, 5000)
+        
+        if t == ndi.FRAME_TYPE_VIDEO:
+            print("Video data received (%dx%d)." % (v.xres, v.yres))
+            frame = np.copy(v.data)
+            cv.imshow('ndi image',frame)
+            ndi.recv_free_video_v2(ndi_recv, v)
+
+        if cv.waitKey(1) & 0xff == 27:
+            break
+
+    ndi.recv_destroy(ndi_recv)
+    ndi.destroy()
+    cv.destroyAllWindows()
+
+    return 0
+
+if __name__ == "__main__":
+    sys.exit(main())