Fix broken playback in Mpv widget

Widget playback was broken under QQmlApplicationEngine based workflows.
Refactoring MpvRenderContext creation to happen in the constructor fixed
playback in this workflow.

ikinuki_client/qtmpv.py

@@ -2,6 +2,7 @@ from PyQt5.QtCore import QUrl, QSize, pyqtSignal, pyqtSlot
 from PyQt5.QtGui import QOpenGLFramebufferObject
 from PyQt5.QtOpenGL import QGLContext
 from PyQt5.QtQuick import QQuickFramebufferObject
+
 from mpv import MPV, MpvRenderContext, OpenGlCbGetProcAddrFn
 
 
@@ -9,7 +10,7 @@ def get_process_address(_, name):
     glctx = QGLContext.currentContext()
     if glctx is None:
         return 0
-    return int(glctx.getProcAddress(name.decode('utf-8')))
+    return int(glctx.getProcAddress(name.decode("utf-8")))
 
 
 class MpvObject(QQuickFramebufferObject):
@@ -37,7 +38,7 @@ class MpvObject(QQuickFramebufferObject):
         """Slot for receiving the update event on the correct thread"""
         self.update()
 
-    def createRenderer(self) -> 'QQuickFramebufferObject.Renderer':
+    def createRenderer(self) -> "QQuickFramebufferObject.Renderer":
         """Overrides the default createRenderer function to create a
         MpvRenderer instance"""
         print("Calling overridden createRenderer")
@@ -58,18 +59,16 @@ class MpvRenderer(QQuickFramebufferObject.Renderer):
         print("Creating MpvRenderer")
         super(MpvRenderer, self).__init__()
         self.obj = parent
-        self.ctx = None
+        self.ctx = MpvRenderContext(
+            self.obj.mpv,
+            "opengl",
+            opengl_init_params={"get_proc_address": self.obj._proc_addr_wrapper},
+        )
+        self.ctx.update_cb = self.obj.on_update
 
     def createFramebufferObject(self, size: QSize) -> QOpenGLFramebufferObject:
         """Overrides the base createFramebufferObject function, augmenting it to
         create an MpvRenderContext using opengl"""
-        if self.obj.mpv_gl is None:
-            print("Creating mpv gl")
-            self.ctx = MpvRenderContext(self.obj.mpv, 'opengl',
-                                        opengl_init_params={
-                                            'get_proc_address': self.obj._proc_addr_wrapper
-                                        })
-            self.ctx.update_cb = self.obj.on_update
 
         return QQuickFramebufferObject.Renderer.createFramebufferObject(self, size)
 
@@ -84,4 +83,6 @@ class MpvRenderer(QQuickFramebufferObject.Renderer):
             height = int(rect.height() * factor)
             fbo = int(self.framebufferObject().handle())
 
-            self.ctx.render(flip_y=False, opengl_fbo={'w': width, 'h': height, 'fbo': fbo})
+            self.ctx.render(
+                flip_y=False, opengl_fbo={"w": width, "h": height, "fbo": fbo}
+            )