specify Linux & Mac display in .ini file instead of hardcode

pylivestream/stream.py

@@ -233,10 +233,7 @@ def screengrab(self, quick: bool = False) -> List[str]:
         """
         grab video from desktop.
         May not work for Wayland desktop.
-
-        NOTE: Linux assumes DISPLAY :0.0
         """
-        DISPLAY = ":0.0"
 
         v: List[str] = ['-f', self.vcap]
 
@@ -249,9 +246,9 @@ def screengrab(self, quick: bool = False) -> List[str]:
 
         if sys.platform == 'linux':
             if quick:
-                v += ['-i', DISPLAY]
+                v += ['-i', self.screenchan]
             else:
-                v += ['-i', f'{DISPLAY}+{self.origin[0]},{self.origin[1]}']
+                v += ['-i', f'{self.screenchan}+{self.origin[0]},{self.origin[1]}']
         elif sys.platform == 'win32':
             if not quick:
                 v += ['-offset_x', str(self.origin[0]), '-offset_y', str(self.origin[1])]

stream.ini

@@ -30,6 +30,7 @@ vcap: avfoundation
 hcam: avfoundation
 [linux]
 webcamchan: /dev/video0
+screenchan: :0.0
 audiochan: default
 vcap: x11grab
 acap: pulse

tests/test.ini

@@ -29,6 +29,7 @@ audiochan: default
 vcap: avfoundation
 hcam: avfoundation
 [linux]
+screenchan: :0.0
 webcamchan: /dev/video0
 audiochan: default
 vcap: x11grab