windows-capture-device-list 1.1.0

Get device list with Windows DirectShow

Getting Camera List and Resolution in Python on Windows

OpenCV does not have an API for enumerating capture devices. The sample shows how to create a Python extension to invoke DirectShow C++ APIs for enumerating capture devices and corresponding resolutions.

Environment

• Microsoft Windows SDK
• Python 3.6 or later

How to Build the CPython Extension

• Create a source distribution:

  python setup.py sdist
  

• distutils:

  python .\setup_distutils.py build
  

• scikit-build:

  pip wheel . --verbose
  

Test

import device
import cv2

def select_camera(last_index):
    number = 0
    hint = "Select a camera (0 to " + str(last_index) + "): "
    try:
        number = int(input(hint))
        # select = int(select)
    except Exception:
        print("It's not a number!")
        return select_camera(last_index)

    if number > last_index:
        print("Invalid number! Retry!")
        return select_camera(last_index)

    return number


def open_camera(index):
    cap = cv2.VideoCapture(index)
    return cap

def main():
    # print OpenCV version
    print("OpenCV version: " + cv2.__version__)

    # Get camera list
    device_list = device.getDeviceList()
    index = 0

    for camera in device_list:
        print(str(index) + ': ' + camera[0] + ' ' + str(camera[1]))
        index += 1

    last_index = index - 1

    if last_index < 0:
        print("No device is connected")
        return

    # Select a camera
    camera_number = select_camera(last_index)
    
    # Open camera
    cap = open_camera(camera_number)

    if cap.isOpened():
        width = cap.get(3) # Frame Width
        height = cap.get(4) # Frame Height
        print('Default width: ' + str(width) + ', height: ' + str(height))

        while True:
            
            ret, frame = cap.read()
            cv2.imshow("frame", frame)

            # key: 'ESC'
            key = cv2.waitKey(20)
            if key == 27:
                break

        cap.release() 
        cv2.destroyAllWindows() 

if __name__ == "__main__":
    main()

python test.py

Blog

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