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33 lines
945 B
33 lines
945 B
import cv2 as cv
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import numpy as np
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class Camera:
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def __init__(self, cam_type_state, stream_type, camera_id):
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try:
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camera_id = int(camera_id)
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except ValueError: # allow strings, ex: /dev/video0
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pass
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self.cam_type_state = cam_type_state
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self.stream_type = stream_type
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self.cur_frame_id = 0
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self.cap = cv.VideoCapture(camera_id)
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self.W = self.cap.get(cv.CAP_PROP_FRAME_WIDTH)
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self.H = self.cap.get(cv.CAP_PROP_FRAME_HEIGHT)
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@classmethod
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def bgr2nv12(self, bgr):
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yuv = cv.cvtColor(bgr, cv.COLOR_BGR2YUV_I420)
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uv_row_cnt = yuv.shape[0] // 3
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uv_plane = np.transpose(yuv[uv_row_cnt * 2:].reshape(2, -1), [1, 0])
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yuv[uv_row_cnt * 2:] = uv_plane.reshape(uv_row_cnt, -1)
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return yuv
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def read_frames(self):
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while True:
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sts , frame = self.cap.read()
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if not sts:
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break
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yuv = Camera.bgr2nv12(frame)
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yield yuv.data.tobytes()
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self.cap.release()
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