fix: use named c_ubyte arrays to prevent dangling pointer segfault in SDL_UpdateNVTexture

src/r36s_dlna_browser/player/gstreamer_backend.py

@@ -246,24 +246,22 @@ class GStreamerBackend(PlayerBackend):
                 if frame.pixel_format == "NV12" and frame.uv_pixels is not None:
                     # Zero-copy NV12 path: upload Y and UV planes separately.
                     # SDL_UpdateNVTexture avoids a full BGRA conversion on CPU.
-                    # ctypes.create_string_buffer returns c_char_Array_N; cast to
-                    # LP_c_ubyte which SDL_UpdateNVTexture requires.
+                    # Use named c_ubyte arrays so the buffers stay alive for the
+                    # duration of the C call (ctypes.cast of a temporary would produce
+                    # a dangling pointer after CPython reference-counts the temp away).
                     try:
-                        _ubyte_p = ctypes.POINTER(ctypes.c_ubyte)
-                        y_data = bytes(frame.pixels)
-                        uv_data = bytes(frame.uv_pixels)
-                        y_buf = ctypes.cast(ctypes.create_string_buffer(y_data), _ubyte_p)
-                        uv_buf = ctypes.cast(ctypes.create_string_buffer(uv_data), _ubyte_p)
+                        y_arr = (ctypes.c_ubyte * len(frame.pixels)).from_buffer_copy(frame.pixels)
+                        uv_arr = (ctypes.c_ubyte * len(frame.uv_pixels)).from_buffer_copy(frame.uv_pixels)
                         log.debug(
                             "SDL_UpdateNVTexture: %dx%d y_len=%d uv_len=%d pitch=%d uv_pitch=%d",
                             frame.width, frame.height,
-                            len(y_data), len(uv_data),
+                            len(frame.pixels), len(frame.uv_pixels),
                             frame.pitch, frame.uv_pitch,
                         )
                         result = sdl2.SDL_UpdateNVTexture(
                             self._texture, None,
-                            y_buf, frame.pitch,
-                            uv_buf, frame.uv_pitch,
+                            y_arr, frame.pitch,
+                            uv_arr, frame.uv_pitch,
                         )
                     except Exception:
                         log.error(