sidedata.*: fix stubtest errors

av/sidedata/encparams.pyi

@@ -1,15 +1,18 @@
 from enum import IntEnum
-from typing import Any, cast
+from typing import Any, cast, final
 
 import numpy as np
 
+from .sidedata import SideData
+
 class VideoEncParamsType(IntEnum):
     NONE = cast(int, ...)
     VP9 = cast(int, ...)
     H264 = cast(int, ...)
     MPEG2 = cast(int, ...)
 
-class VideoEncParams:
+@final
+class VideoEncParams(SideData):
     nb_blocks: int
     blocks_offset: int
     block_size: int
@@ -19,9 +22,11 @@ class VideoEncParams:
     def block_params(self, idx: int) -> VideoBlockParams: ...
     def qp_map(self) -> np.ndarray[Any, Any]: ...
 
+@final
 class VideoBlockParams:
     src_x: int
     src_y: int
     w: int
     h: int
     delta_qp: int
+    def __init__(self, video_enc_params: VideoEncParams, idx: int, /) -> None: ...

av/sidedata/motionvectors.pyi

@@ -1,16 +1,21 @@
 from collections.abc import Iterator
-from typing import Any
+from typing import Any, final
 
 import numpy as np
 
+from av.frame import Frame
+
 from .sidedata import SideData
 
+@final
 class MotionVectors(SideData):
-    def __getitem__(self, index: int) -> MotionVector: ...
+    def __init__(self, sentinel: object, frame: Frame, index: int, /) -> None: ...
+    def __getitem__(self, index: int, /) -> MotionVector: ...
     def __iter__(self) -> Iterator[MotionVector]: ...
     def __len__(self) -> int: ...
     def to_ndarray(self) -> np.ndarray[Any, Any]: ...
 
+@final
 class MotionVector:
     source: int
     w: int
@@ -22,3 +27,6 @@ class MotionVector:
     motion_x: int
     motion_y: int
     motion_scale: int
+    def __init__(
+        self, sentinel: object, parent: MotionVectors, index: int, /
+    ) -> None: ...

av/sidedata/sidedata.pyi

@@ -2,7 +2,10 @@ from collections.abc import Iterator, Mapping, Sequence
 from enum import Enum
 from typing import ClassVar, cast, overload
 
+from typing_extensions import disjoint_base
+
 from av.buffer import Buffer
+from av.frame import Frame
 
 class Type(Enum):
     PANSCAN = cast(ClassVar[Type], ...)
@@ -38,17 +41,15 @@ class Type(Enum):
     THREE_D_REFERENCE_DISPLAYS = cast(ClassVar[Type], ...)
     EXIF = cast(ClassVar[Type], ...)
 
+@disjoint_base
 class SideData(Buffer):
     type: Type
+    def __init__(self, sentinel: object, frame: Frame, index: int, /) -> None: ...
 
 class SideDataContainer(Mapping):
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[Type]: ...
     @overload
-    def __getitem__(self, key: str | int | Type) -> SideData: ...
-    @overload
-    def __getitem__(self, key: slice) -> Sequence[SideData]: ...
+    def __getitem__(self, key: str | int | Type, /) -> SideData: ...
     @overload
-    def __getitem__(
-        self, key: str | int | Type | slice
-    ) -> SideData | Sequence[SideData]: ...
+    def __getitem__(self, key: slice, /) -> Sequence[SideData]: ...