| import os |
| import time |
|
|
| import cv2 |
| import numpy as np |
| import pyarrow as pa |
|
|
| from dora import DoraStatus |
|
|
| CAMERA_WIDTH = 640 |
| CAMERA_HEIGHT = 480 |
| CAMERA_INDEX = int(os.getenv("CAMERA_INDEX", 0)) |
| CI = os.environ.get("CI") |
|
|
| font = cv2.FONT_HERSHEY_SIMPLEX |
|
|
|
|
| class Operator: |
| """ |
| Sending image from webcam to the dataflow |
| """ |
|
|
| def __init__(self): |
| self.video_capture = cv2.VideoCapture(CAMERA_INDEX) |
| self.start_time = time.time() |
| self.video_capture.set(cv2.CAP_PROP_FRAME_WIDTH, CAMERA_WIDTH) |
| self.video_capture.set(cv2.CAP_PROP_FRAME_HEIGHT, CAMERA_HEIGHT) |
| self.failure_count = 0 |
|
|
| def on_event( |
| self, |
| dora_event: str, |
| send_output, |
| ) -> DoraStatus: |
| event_type = dora_event["type"] |
| if event_type == "INPUT": |
| ret, frame = self.video_capture.read() |
| if ret: |
| frame = cv2.resize(frame, (CAMERA_WIDTH, CAMERA_HEIGHT)) |
| self.failure_count = 0 |
| |
| else: |
| if self.failure_count > 10: |
| frame = np.zeros((CAMERA_HEIGHT, CAMERA_WIDTH, 3), dtype=np.uint8) |
| cv2.putText( |
| frame, |
| "No Webcam was found at index %d" % (CAMERA_INDEX), |
| (int(30), int(30)), |
| font, |
| 0.75, |
| (255, 255, 255), |
| 2, |
| 1, |
| ) |
| else: |
| self.failure_count += 1 |
| return DoraStatus.CONTINUE |
|
|
| send_output( |
| "image", |
| pa.array(frame.ravel()), |
| dora_event["metadata"], |
| ) |
| elif event_type == "STOP": |
| print("received stop") |
| else: |
| print("received unexpected event:", event_type) |
|
|
| if time.time() - self.start_time < 20 or CI != "true": |
| return DoraStatus.CONTINUE |
| else: |
| return DoraStatus.STOP |
|
|
| def __del__(self): |
| self.video_capture.release() |
|
|
