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April 22, 2020 18:17
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a delayed mirror with minimal rewind functionality
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| import numpy as np | |
| import cv2 | |
| import time | |
| cap = cv2.VideoCapture(0) | |
| FRAME_DELAY = 120 | |
| cv2.namedWindow('frame', cv2.WINDOW_FREERATIO) | |
| # cv2.setWindowProperty('frame', cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN) | |
| unseen_buffer = [] | |
| history_buffer = [] | |
| for i in range(FRAME_DELAY): | |
| ret, frame = cap.read() | |
| unseen_buffer.append(frame) | |
| def mirror(pressed_key): | |
| # Capture frame-by-frame | |
| t = time.time() | |
| ret, frame = cap.read() | |
| unseen_buffer.append(frame) | |
| frame = unseen_buffer.pop(0) | |
| history_buffer.append(frame) | |
| if len(history_buffer) > 30 * 600: # translates to 10 min @ 30 FPS | |
| history_buffer.pop(0) | |
| cv2.imshow('frame',frame) | |
| print(f"FPS:{1/(time.time()-t)}") | |
| def replay(pressed_key): | |
| global frame_idx | |
| if pressed_key == ord(','): | |
| frame_idx = frame_idx-1 | |
| if frame_idx < 0: | |
| frame_idx = 0 | |
| print("Oldest frame, can't go back further") | |
| if pressed_key == ord('.'): | |
| frame_idx = frame_idx+1 | |
| if frame_idx > len(history_buffer)-1: | |
| frame_idx = len(history_buffer)-1 | |
| print("Newest frame, throw a flip already... bitch!") | |
| frame = history_buffer[frame_idx] | |
| cv2.imshow('frame',frame) | |
| PAUSE = False | |
| while(True): | |
| pressed_key = cv2.waitKey(30) & 0xFF | |
| if pressed_key == ord('q'): | |
| breakm | |
| elif pressed_key == ord(' '): | |
| PAUSE = not PAUSE | |
| if PAUSE: | |
| frame_idx = len(history_buffer) - 1 | |
| print("Rewind time!") | |
| else: | |
| print("Resume mirroring") | |
| if not PAUSE: | |
| mirror(pressed_key) | |
| else: | |
| replay(pressed_key) | |
| # When everything done, release the capture | |
| cap.release() | |
| cv2.destroyAllWindows() |
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