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+# Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+# SPDX-License-Identifier: MIT
+
+"""
+Object detection demo that takes a video file, runs inference on each frame producing
+bounding boxes and labels around detected objects, and saves the processed video.
+"""
+
+import os
+import cv2
+import pyarmnn as ann
+from tqdm import tqdm
+from argparse import ArgumentParser
+
+from ssd import ssd_processing, ssd_resize_factor
+from yolo import yolo_processing, yolo_resize_factor
+from utils import create_video_writer, create_network, dict_labels, preprocess, execute_network, draw_bounding_boxes
+
+
+parser = ArgumentParser()
+parser.add_argument('--video_file_path', required=True, type=str,
+ help='Path to the video file to run object detection on')
+parser.add_argument('--model_file_path', required=True, type=str,
+ help='Path to the Object Detection model to use')
+parser.add_argument('--model_name', required=True, type=str,
+ help='The name of the model being used. Accepted options: ssd_mobilenet_v1, yolo_v3_tiny')
+parser.add_argument('--label_path', type=str,
+ help='Path to the labelset for the provided model file')
+parser.add_argument('--output_video_file_path', type=str,
+ help='Path to the output video file with detections added in')
+parser.add_argument('--preferred_backends', type=str, nargs='+', default=['CpuAcc', 'CpuRef'],
+ help='Takes the preferred backends in preference order, separated by whitespace, '
+ 'for example: CpuAcc GpuAcc CpuRef. Accepted options: [CpuAcc, CpuRef, GpuAcc]. '
+ 'Defaults to [CpuAcc, CpuRef]')
+args = parser.parse_args()
+
+
+def init_video(video_path: str, output_path: str):
+ """
+ Creates a video capture object from a video file.
+
+ Args:
+ video_path: User-specified video file path.
+ output_path: Optional path to save the processed video.
+
+ Returns:
+ Video capture object to capture frames, video writer object to write processed
+ frames to file, plus total frame count of video source to iterate through.
+ """
+ if not os.path.exists(video_path):
+ raise FileNotFoundError(f'Video file not found for: {video_path}')
+ video = cv2.VideoCapture(video_path)
+ if not video.isOpened:
+ raise RuntimeError(f'Failed to open video capture from file: {video_path}')
+
+ video_writer = create_video_writer(video, video_path, output_path)
+ iter_frame_count = range(int(video.get(cv2.CAP_PROP_FRAME_COUNT)))
+ return video, video_writer, iter_frame_count
+
+
+def get_model_processing(model_name: str, video: cv2.VideoCapture, input_binding_info: tuple):
+ """
+ Gets model-specific information such as model labels and decoding and processing functions.
+ The user can include their own network and functions by adding another statement.
+
+ Args:
+ model_name: Name of type of supported model.
+ video: Video capture object, contains information about data source.
+ input_binding_info: Contains shape of model input layer, used for scaling bounding boxes.
+
+ Returns:
+ Model labels, decoding and processing functions.
+ """
+ if model_name == 'ssd_mobilenet_v1':
+ labels = os.path.join('ssd_labels.txt')
+ return labels, ssd_processing, ssd_resize_factor(video)
+ elif model_name == 'yolo_v3_tiny':
+ labels = os.path.join('yolo_labels.txt')
+ return labels, yolo_processing, yolo_resize_factor(video, input_binding_info)
+ else:
+ raise ValueError(f'{model_name} is not a valid model name')
+
+
+def main(args):
+ video, video_writer, frame_count = init_video(args.video_file_path, args.output_video_file_path)
+ net_id, runtime, input_binding_info, output_binding_info = create_network(args.model_file_path,
+ args.preferred_backends)
+ output_tensors = ann.make_output_tensors(output_binding_info)
+ labels, process_output, resize_factor = get_model_processing(args.model_name, video, input_binding_info)
+ labels = dict_labels(labels if args.label_path is None else args.label_path)
+
+ for _ in tqdm(frame_count, desc='Processing frames'):
+ frame_present, frame = video.read()
+ if not frame_present:
+ continue
+ input_tensors = preprocess(frame, input_binding_info)
+ inference_output = execute_network(input_tensors, output_tensors, runtime, net_id)
+ detections = process_output(inference_output)
+ draw_bounding_boxes(frame, detections, resize_factor, labels)
+ video_writer.write(frame)
+ print('Finished processing frames')
+ video.release(), video_writer.release()
+
+
+if __name__ == '__main__':
+ main(args)