From 70beed73465ab27449a59c62043d94c16efe00c5 Mon Sep 17 00:00:00 2001
From: Franoosh <uinarf@autistici.org>
Date: Wed, 15 Oct 2025 14:42:29 +0200
Subject: Added camera support. Movement recognition and video streaming. Web
 server and frontend. Work in progress. To be fixed: frontend reloading
 information about client and a page after major changes like camera name or
 address change, camera removal. Add certificates before testing on actual
 distributed hardware. Add user login logic.

---
 helpers.py | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

(limited to 'helpers.py')

diff --git a/helpers.py b/helpers.py
index 409a253..8190782 100644
--- a/helpers.py
+++ b/helpers.py
@@ -8,6 +8,8 @@ __author__ = "Franoosh Corporation"
 
 
 import logging
+import subprocess
+import cv2
 
 
 class CustomLoggingFormatter(logging.Formatter):
@@ -42,3 +44,64 @@ class CustomLoggingFormatter(logging.Formatter):
 
         return result
 
+def process_frame(frame):
+    """Process frame for contour detection."""
+    # Convert to grayscale:
+    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
+    # Apply Gaussian blur:
+    blurred = cv2.GaussianBlur(gray, (21, 21), 0)
+
+    return blurred
+
+def compute_contours(frame_deque):
+    """Compute contours from a deque of frames."""
+    contours = []
+    if len(frame_deque) < 2:
+        return contours
+    all_contours = []
+
+    for idx, frame in enumerate(frame_deque):
+        frame_0 = process_frame(frame)
+        try:
+            frame_1 = process_frame(frame_deque[idx+1])
+        except IndexError:
+            break
+        frame_delta = cv2.absdiff(frame_0, frame_1)
+        threshold = cv2.threshold(frame_delta, 25, 255, cv2.THRESH_BINARY)[1]
+        threshold = cv2.dilate(threshold, None, iterations=2)
+        contours, _ = cv2.findContours(threshold.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
+        all_contours.extend(contours)
+
+    return all_contours
+
+def draw_contours(frame, contours, min_contour_area=500):
+    """Draw contours on the frame."""
+    for contour in contours:
+        if cv2.contourArea(contour) > min_contour_area:
+            (x, y, w, h) = cv2.boundingRect(contour)
+            cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
+
+    return frame
+
+def detect_movement(contours, min_area=500):
+    """Detect movement based on contours found from frame diff."""
+    for contour in contours:
+        if cv2.contourArea(contour) >= min_area:
+            return True
+    return False
+
+def get_available_cameras():
+    """
+    Get list of available camera devices.
+    At the moment it does not work. At all. It is useless.
+    """
+    proc = subprocess.Popen(['v4l2-ctl', '--list-devices'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stdout, stderr = proc.communicate()
+    candidate_devices = [i.strip() for i in stdout.decode('utf-8').strip().splitlines()[1:]]
+    verified_devices = []
+    for device in candidate_devices:
+        cap = cv2.VideoCapture(device)
+        if cap.isOpened():
+            verified_devices.append(device)
+        cap.release()
+    return verified_devices
\ No newline at end of file
-- 
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