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import threading
import time
import pyvirtualcam
class StreamWriter():
FPS = 30
VCam = None
Active = False
THREAD_LOCK_STREAM = threading.Lock()
time_last_process = None
timespan_min = 0.0
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.Close()
def __init__(self, size, fps):
self.time_last_process = time.perf_counter()
self.FPS = fps
self.timespan_min = 1.0 / fps
print('Detecting virtual cam devices')
self.VCam = pyvirtualcam.Camera(width=size[0], height=size[1], fps=fps, fmt=pyvirtualcam.PixelFormat.BGR, print_fps=False)
if self.VCam is None:
print("No virtual camera found!")
return
print(f'Using virtual camera: {self.VCam.device}')
print(f'Using {self.VCam.native_fmt}')
self.Active = True
def LimitFrames(self):
while True:
current_time = time.perf_counter()
time_passed = current_time - self.time_last_process
if time_passed >= self.timespan_min:
break
# First version used a queue and threading. Surprisingly this
# totally simple, blocking version is 10 times faster!
def WriteToStream(self, frame):
if self.VCam is None:
return
with self.THREAD_LOCK_STREAM:
self.LimitFrames()
self.VCam.send(frame)
self.time_last_process = time.perf_counter()
def Close(self):
self.Active = False
if self.VCam is None:
self.VCam.close()
self.VCam = None
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