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import os
import platform
import sys
import warnings
from abc import ABC, abstractmethod
from pygame import error
_is_init = False
class AbstractCamera(ABC):
# set_controls and get_controls are not a part of the AbstractCamera ABC,
# because implementations of the same can vary across different Camera
# types
@abstractmethod
def __init__(self, *args, **kwargs):
""" """
@abstractmethod
def start(self):
""" """
@abstractmethod
def stop(self):
""" """
@abstractmethod
def get_size(self):
""" """
@abstractmethod
def query_image(self):
""" """
@abstractmethod
def get_image(self, dest_surf=None):
""" """
@abstractmethod
def get_raw(self):
""" """
def _pre_init_placeholder():
if not _is_init:
raise error("pygame.camera is not initialized")
# camera was init, and yet functions are not monkey patched. This should
# not happen
raise NotImplementedError()
def _pre_init_placeholder_varargs(*_, **__):
_pre_init_placeholder()
class _PreInitPlaceholderCamera(AbstractCamera):
__init__ = _pre_init_placeholder_varargs
start = _pre_init_placeholder_varargs
stop = _pre_init_placeholder_varargs
get_controls = _pre_init_placeholder_varargs
set_controls = _pre_init_placeholder_varargs
get_size = _pre_init_placeholder_varargs
query_image = _pre_init_placeholder_varargs
get_image = _pre_init_placeholder_varargs
get_raw = _pre_init_placeholder_varargs
list_cameras = _pre_init_placeholder
Camera = _PreInitPlaceholderCamera
def _colorspace_not_available(*args):
raise RuntimeError("pygame is not built with colorspace support")
try:
from pygame import _camera
colorspace = _camera.colorspace
except ImportError:
# Should not happen in most cases
colorspace = _colorspace_not_available
def _setup_backend(backend):
global list_cameras, Camera
if backend == "opencv-mac":
from pygame import _camera_opencv
list_cameras = _camera_opencv.list_cameras_darwin
Camera = _camera_opencv.CameraMac
elif backend == "opencv":
from pygame import _camera_opencv
list_cameras = _camera_opencv.list_cameras
Camera = _camera_opencv.Camera
elif backend in ("_camera (msmf)", "_camera (v4l2)"):
from pygame import _camera
list_cameras = _camera.list_cameras
Camera = _camera.Camera
elif backend == "videocapture":
from pygame import _camera_vidcapture
warnings.warn(
"The VideoCapture backend is not recommended and may be removed."
"For Python3 and Windows 8+, there is now a native Windows "
"backend built into pygame.",
DeprecationWarning,
stacklevel=2,
)
_camera_vidcapture.init()
list_cameras = _camera_vidcapture.list_cameras
Camera = _camera_vidcapture.Camera
else:
raise ValueError("unrecognized backend name")
def get_backends():
possible_backends = []
if sys.platform == "win32":
version_code = platform.win32_ver()[0].split(".")[0]
if "Server" in version_code:
version_code = ''.join(filter(str.isdigit, version_code))[:4]
minimum_satisfied = int(version_code) >= 2012
else:
minimum_satisfied = int(version_code) >= 8
if minimum_satisfied:
try:
# If cv2 is installed, prefer that on windows.
import cv2
possible_backends.append("OpenCV")
except ImportError:
possible_backends.append("_camera (MSMF)")
if "linux" in sys.platform:
possible_backends.append("_camera (V4L2)")
if "darwin" in sys.platform:
possible_backends.append("OpenCV-Mac")
if "OpenCV" not in possible_backends:
possible_backends.append("OpenCV")
if sys.platform == "win32":
possible_backends.append("VideoCapture")
# see if we have any user specified defaults in environments.
camera_env = os.environ.get("PYGAME_CAMERA", "").lower()
if camera_env == "opencv": # prioritize opencv
if "OpenCV" in possible_backends:
possible_backends.remove("OpenCV")
possible_backends = ["OpenCV"] + possible_backends
if camera_env in ("vidcapture", "videocapture"): # prioritize vidcapture
if "VideoCapture" in possible_backends:
possible_backends.remove("VideoCapture")
possible_backends = ["VideoCapture"] + possible_backends
return possible_backends
def init(backend=None):
global _is_init
# select the camera module to import here.
backends = [b.lower() for b in get_backends()]
if not backends:
raise error("No camera backends are supported on your platform!")
backend = backends[0] if backend is None else backend.lower()
if backend not in backends:
warnings.warn(
"We don't think this is a supported backend on this system, "
"but we'll try it...",
Warning,
stacklevel=2,
)
try:
_setup_backend(backend)
except ImportError:
emsg = f"Backend '{backend}' is not supported on your platform!"
if backend in ("opencv", "opencv-mac", "videocapture"):
dep = "vidcap" if backend == "videocapture" else "OpenCV"
emsg += (
f" Make sure you have '{dep}' installed to be able to use this backend"
)
raise error(emsg)
_is_init = True
def quit():
global _is_init, Camera, list_cameras
# reset to their respective pre-init placeholders
list_cameras = _pre_init_placeholder
Camera = _PreInitPlaceholderCamera
_is_init = False
if __name__ == "__main__":
# try and use this camera stuff with the pygame camera example.
import pygame.examples.camera
# pygame.camera.Camera = Camera
# pygame.camera.list_cameras = list_cameras
pygame.examples.camera.main()
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