py: db.py: Print frame rate at 5s intervals

Print both the number of vsyncs (as reported by the driver in flip
events) and the number of flip events. This is useful to debug frame
rate related issues.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/py/tests/db.py b/py/tests/db.py
index 20f42360b992932ada039b60c26a369447846fe4..f0a962d72216ebb61960766ea4e1a0dbc2160ddc 100755 (executable)
--- a/py/tests/db.py
+++ b/py/tests/db.py
@@ -14,8 +14,26 @@ class FlipHandler(pykms.PageFlipHandlerBase):
         self.front_buf = 0
         self.fb1 = pykms.DumbFramebuffer(card, mode.hdisplay, mode.vdisplay, "XR24");
         self.fb2 = pykms.DumbFramebuffer(card, mode.hdisplay, mode.vdisplay, "XR24");
+        self.flips = 0
+        self.frames = 0
+        self.time = 0
 
     def handle_page_flip(self, frame, time):
+        self.flips += 1
+        if self.time == 0:
+            self.frames = frame
+            self.time = time
+
+        time_delta = time - self.time
+        if time_delta >= 5:
+            frame_delta = frame - self.frames
+            print("Frame rate: %f (%u/%u frames in %f s)" %
+                  (frame_delta / time_delta, self.flips, frame_delta, time_delta))
+
+            self.flips = 0
+            self.frames = frame
+            self.time = time
+
         if self.front_buf == 0:
             fb = self.fb2
         else: