* update camera api and add rtsp demo

examples/vision/streaming/rtsp_and_display.py

@@ -0,0 +1,26 @@
+from maix import app, rtsp, camera, image, display
+
+# init camera
+cam = camera.Camera(2560, 1440, image.Format.FMT_YVU420SP)
+cam2 = cam.add_channel(640, 480)
+
+# init display
+disp = display.Display()
+
+# init rtsp server
+server = rtsp.Rtsp()
+server.bind_camera(cam)
+server.start()
+
+# draw region
+rgn = server.add_region(0, 0, 200, 100)
+canvas = rgn.get_canvas()
+canvas.draw_string(0, 0, "Hello MaixPy")
+rgn.update_canvas()
+
+print(server.get_url())
+while not app.need_exit():
+    img = cam2.read()
+    disp.show(img)
+
+server.stop()

maix/v1/sensor.py

@@ -142,21 +142,21 @@ def get_id():
     raise ValueError('This operation is not supported')
 
 def set_hmirror(enable):
-    __camera.set_vflip(enable)
+    __camera.hmirror(enable)
 
 def set_vflip(enable):
-    __camera.set_vflip(enable)
+    __camera.vflip(enable)
 
 def set_brightness(brightness):
     brightness = brightness + 3
     val = brightness * 100 / 4
-    __camera.set_luma(int(val))
+    __camera.luma(int(val))
 
 def set_contrast(contrast):
-    __camera.set_constrast(contrast)
+    __camera.constrast(contrast)
 
 def set_saturation(saturation):
-    __camera.set_saturation(saturation)
+    __camera.saturation(saturation)
 
 def width():
     return __camera.width()