Fight_detec_func.py

import tensorflow as tf
from frame_slicer import extract_video_frames
import cv2
import os
import numpy as np
import matplotlib.pyplot as plt

# Configuration
import os
MODEL_PATH = os.path.join(os.path.dirname(__file__),"final_model_2.h5")
N_FRAMES = 30
IMG_SIZE = (96, 96)
# Define RESULT_PATH relative to the script location
RESULT_PATH = os.path.join(os.path.dirname(__file__), "results")

def fight_detec(video_path: str, debug: bool = True):
    """Detects fight in a video and returns the result string and raw prediction score."""

    class FightDetector:
        def __init__(self):
            self.model = self._load_model()

        def _load_model(self):
            # Ensure the model path exists before loading
            if not os.path.exists(MODEL_PATH):
                print(f"Error: Model file not found at {MODEL_PATH}")
                return None
            try:
                # Load model with compile=False if optimizer state isn't needed for inference
                model = tf.keras.models.load_model(MODEL_PATH, compile=False)
                if debug:
                    print("\nModel loaded successfully. Input shape:", model.input_shape)
                return model
            except Exception as e:
                print(f"Model loading failed: {e}")
                return None

        def _extract_frames(self, video_path):
            frames = extract_video_frames(video_path, N_FRAMES, IMG_SIZE)
            if frames is None:
                print(f"Frame extraction returned None for {video_path}")
                return None

            if debug:
                blank_frames = np.all(frames == 0, axis=(1, 2, 3)).sum()
                if blank_frames > 0:
                    print(f"Warning: {blank_frames} blank frames detected")
                # Save a sample frame for debugging only if debug is True
                if frames.shape[0] > 0 and not np.all(frames[0] == 0): # Avoid saving blank frame
                    sample_frame = (frames[0] * 255).astype(np.uint8)
                    try:
                        os.makedirs(RESULT_PATH, exist_ok=True) # Ensure result path exists
                        debug_frame_path = os.path.join(RESULT_PATH, 'debug_frame.jpg')
                        cv2.imwrite(debug_frame_path, cv2.cvtColor(sample_frame, cv2.COLOR_RGB2BGR))
                        print(f"Debug frame saved to {debug_frame_path}")
                    except Exception as e:
                        print(f"Failed to save debug frame: {e}")
                else:
                     print("Skipping debug frame save (first frame blank or no frames).")


            return frames

        def predict(self, video_path):
            if not os.path.exists(video_path):
                print(f"Error: Video not found at {video_path}")
                return "Error: Video not found", None

            try:
                frames = self._extract_frames(video_path)
                if frames is None:
                    return "Error: Frame extraction failed", None

                if frames.shape[0] != N_FRAMES:
                    # Pad with last frame or zeros if not enough frames were extracted
                    print(f"Warning: Expected {N_FRAMES} frames, got {frames.shape[0]}. Padding...")
                    if frames.shape[0] == 0: # No frames at all
                         frames = np.zeros((N_FRAMES, *IMG_SIZE, 3), dtype=np.float32)
                    else: # Pad with the last available frame
                        padding_needed = N_FRAMES - frames.shape[0]
                        last_frame = frames[-1][np.newaxis, ...]
                        padding = np.repeat(last_frame, padding_needed, axis=0)
                        frames = np.concatenate((frames, padding), axis=0)
                    print(f"Frames padded to shape: {frames.shape}")


                if np.all(frames == 0):
                    # Check if all frames are actually blank (can happen with padding)
                    print("Error: All frames are blank after processing/padding.")
                    return "Error: All frames are blank", None

                # Perform prediction
                prediction = self.model.predict(frames[np.newaxis, ...], verbose=0)[0][0]
                # Determine result based on threshold
                threshold = 0.61 # Example threshold
                is_fight = prediction >= threshold
                result = "FIGHT" if is_fight else "NORMAL"

                # Calculate confidence (simple distance from threshold, scaled)
                # Adjust scaling factor (e.g., 150) and base (e.g., 50) as needed
                # Ensure confidence reflects certainty (higher for values far from threshold)
                if is_fight:
                    confidence = min(max((prediction - threshold) * 150 + 50, 0), 100)
                else:
                    confidence = min(max((threshold - prediction) * 150 + 50, 0), 100)


                result_string = f"{result} ({confidence:.1f}% confidence)"

                if debug:
                    print(f"Raw Prediction Score: {prediction:.4f}")
                    self._debug_visualization(frames, prediction, result_string, video_path)

                return result_string, float(prediction) # Return string and raw score

            except Exception as e:
                print(f"Prediction error: {str(e)}")
                # Consider logging the full traceback here in a real application
                # import traceback
                # print(traceback.format_exc())
                return f"Prediction error: {str(e)}", None

        def _debug_visualization(self, frames, score, result, video_path):
            # This function will only run if debug=True is passed to fight_detec
            print(f"\n--- Debug Visualization ---")
            print(f"Prediction Score: {score:.4f}")
            print(f"Decision: {result}")

            # Avoid plotting if matplotlib is not available or causes issues in deployment
            try:
                import matplotlib.pyplot as plt
                plt.figure(figsize=(15, 5))
                num_frames_to_show = min(10, len(frames))
                for i in range(num_frames_to_show):
                    plt.subplot(2, 5, i+1)
                    # Ensure frame values are valid for imshow (0-1 or 0-255)
                    img_display = frames[i]
                    if np.max(img_display) <= 1.0: # Assuming normalized float [0,1]
                         img_display = (img_display * 255).astype(np.uint8)
                    else: # Assuming it might already be uint8 [0,255]
                         img_display = img_display.astype(np.uint8)

                    plt.imshow(img_display)
                    plt.title(f"Frame {i}\nMean: {frames[i].mean():.2f}") # Use original frame for mean
                    plt.axis('off')
                plt.suptitle(f"Video: {os.path.basename(video_path)}\nPrediction: {result} (Raw Score: {score:.4f})")
                plt.tight_layout(rect=[0, 0.03, 1, 0.95]) # Adjust layout

                # Save the visualization
                os.makedirs(RESULT_PATH, exist_ok=True) # Ensure result path exists again
                base_name = os.path.splitext(os.path.basename(video_path))[0]
                save_path = os.path.join(RESULT_PATH, f"{base_name}_prediction_result.png")
                plt.savefig(save_path)
                plt.close() # Close the plot to free memory
                print(f"Debug visualization saved to: {save_path}")
            except ImportError:
                print("Matplotlib not found. Skipping debug visualization plot.")
            except Exception as e:
                print(f"Error during debug visualization: {e}")
            print("--- End Debug Visualization ---")


    # --- Main function logic ---
    detector = FightDetector()
    if detector.model is None:
        # Model loading failed, return error
        return "Error: Model loading failed", None

    # Call the predict method
    result_str, prediction_score = detector.predict(video_path)
    return result_str, prediction_score


# # Example usage (commented out for library use)
# if __name__ == "__main__":
#     # Example of how to call the function
#     test_video = input("Enter the local path to the video file: ").strip('"')
#     if os.path.exists(test_video):
#         print(f"[INFO] Processing video: {test_video}")
#         result, score = fight_detec(test_video, debug=True) # Enable debug for local testing
#         print(f"\nFinal Result: {result}")
#         if score is not None:
#             print(f"Raw Score: {score:.4f}")
#     else:
#         print(f"Error: File not found - {test_video}")