Make VideoFormat.components lazy

av/video/format.pxd

@@ -5,7 +5,6 @@ cdef class VideoFormat:
     cdef lib.AVPixelFormat pix_fmt
     cdef const lib.AVPixFmtDescriptor *ptr
     cdef readonly unsigned int width, height
-    cdef readonly tuple components
     cdef _init(self, lib.AVPixelFormat pix_fmt, unsigned int width, unsigned int height)
     cpdef chroma_width(self, int luma_width=?)
     cpdef chroma_height(self, int luma_height=?)

av/video/format.py

@@ -55,9 +55,6 @@ def _init(self, pix_fmt: lib.AVPixelFormat, width: cuint, height: cuint):
         self.ptr = lib.av_pix_fmt_desc_get(pix_fmt)
         self.width = width
         self.height = height
-        self.components = tuple(
-            VideoFormatComponent(self, i) for i in range(self.ptr.nb_components)
-        )
 
     def __repr__(self):
         if self.width or self.height:
@@ -73,6 +70,12 @@ def name(self):
         """Canonical name of the pixel format."""
         return cython.cast(str, self.ptr.name)
 
+    @property
+    def components(self):
+        return tuple(
+            VideoFormatComponent(self, i) for i in range(self.ptr.nb_components)
+        )
+
     @property
     def bits_per_pixel(self):
         return lib.av_get_bits_per_pixel(self.ptr)

av/video/format.pyi

@@ -6,14 +6,14 @@ class VideoFormat:
     has_palette: bool
     is_bit_stream: bool
     is_planar: bool
+    width: int
+    height: int
+    @property
+    def components(self) -> tuple[VideoFormatComponent, ...]: ...
     @property
     def is_rgb(self) -> bool: ...
     @property
     def is_bayer(self) -> bool: ...
-    width: int
-    height: int
-    components: tuple[VideoFormatComponent, ...]
-
     def __init__(self, name: str, width: int = 0, height: int = 0) -> None: ...
     def chroma_width(self, luma_width: int = 0) -> int: ...
     def chroma_height(self, luma_height: int = 0) -> int: ...