Improve webcam

ThomasFarstrike · ThomasFarstrike · commit 016028ff49dd · 2025-05-14T10:06:11.000+02:00
diff --git a/c_mpos/src/webcam.c b/c_mpos/src/webcam.c
@@ -23,8 +23,8 @@
 #define CAPTURE_HEIGHT 480
 #define OUTPUT_WIDTH 240   // Resize to 240x240
 #define OUTPUT_HEIGHT 240
-#define NUM_BUFFERS 2      // Revert to 2 buffers, as it achieved 2 captures
-#define QUEUE_RETRIES 10   // Increase retries for robustness
+#define NUM_BUFFERS 10      // Revert to 2 buffers, as it achieved 2 captures
+#define QUEUE_RETRIES 5   // Increase retries for robustness
 #define QUEUE_RETRY_DELAY_US 200000  // 200ms delay between retries
 
 // Webcam object type
diff --git a/internal_filesystem/apps/com.example.camtest/assets/camtest.py b/internal_filesystem/apps/com.example.camtest/assets/camtest.py
@@ -98,7 +98,7 @@ def try_capture():
         new_cam_buffer = cam.capture_grayscale()
     elif cam.frame_available():
         new_cam_buffer = cam.capture()  # Returns memoryview
-    if len(new_cam_buffer):
+    if new_cam_buffer and len(new_cam_buffer):
         #    print("Invalid buffer size:", len(new_cam_buffer))
         #    cam.free_buffer()
         #    return
@@ -200,7 +200,11 @@ def __init__(self):
         # webcam.init() returns (obj, capture_grayscale, deinit)
         self.obj, self._capture_grayscale, self._deinit = webcam.init()
     def capture_grayscale(self):
-        return self._capture_grayscale(self.obj)
+        try:
+            return self._capture_grayscale(self.obj)
+        except Exception as e:
+            print(f"capture got exception {e}")
+            self.deinit()
     def deinit(self):
         return self._deinit(self.obj)
 
