Address #1663

av/video/reformatter.pyi

@@ -27,7 +27,8 @@ class Colorspace(IntEnum):
     fcc: int
     itu601: int
     itu624: int
-    smpte240: int
+    smpte170m: int
+    smpte240m: int
     default: int
 
 class ColorRange(IntEnum):

av/video/reformatter.pyx

@@ -45,6 +45,19 @@ class ColorRange(IntEnum):
     NB: "Not part of ABI" = lib.AVCOL_RANGE_NB
 
 
+def _resolve_enum_value(value, enum_class, default):
+    # Helper function to resolve enum values from different input types.
+    if value is None:
+        return default
+    if isinstance(value, enum_class):
+        return value.value
+    if isinstance(value, int):
+        return value
+    if isinstance(value, str):
+        return enum_class[value].value
+    raise ValueError(f"Cannot convert {value} to {enum_class.__name__}")
+
+
 cdef class VideoReformatter:
     """An object for reformatting size and pixel format of :class:`.VideoFrame`.
 
@@ -83,11 +96,12 @@ cdef class VideoReformatter:
         """
 
         cdef VideoFormat video_format = VideoFormat(format if format is not None else frame.format)
-        cdef int c_src_colorspace = (Colorspace[src_colorspace].value if src_colorspace is not None else frame.colorspace)
-        cdef int c_dst_colorspace = (Colorspace[dst_colorspace].value if dst_colorspace is not None else frame.colorspace)
-        cdef int c_interpolation = (Interpolation[interpolation] if interpolation is not None else Interpolation.BILINEAR).value
-        cdef int c_src_color_range = (ColorRange[src_color_range].value if src_color_range is not None else 0)
-        cdef int c_dst_color_range = (ColorRange[dst_color_range].value if dst_color_range is not None else 0)
+
+        cdef int c_src_colorspace = _resolve_enum_value(src_colorspace, Colorspace, frame.colorspace)
+        cdef int c_dst_colorspace = _resolve_enum_value(dst_colorspace, Colorspace, frame.colorspace)
+        cdef int c_interpolation = _resolve_enum_value(interpolation, Interpolation, int(Interpolation.BILINEAR))
+        cdef int c_src_color_range = _resolve_enum_value(src_color_range, ColorRange, 0)
+        cdef int c_dst_color_range = _resolve_enum_value(dst_color_range, ColorRange, 0)
 
         return self._reformat(
             frame,

tests/test_videoframe.py

@@ -7,6 +7,7 @@
 
 import av
 from av import VideoFrame
+from av.video.reformatter import ColorRange, Colorspace, Interpolation
 
 from .common import (
     TestCase,
@@ -145,6 +146,24 @@ def test_roundtrip(self) -> None:
         img.save(self.sandboxed("roundtrip-high.jpg"))
         assertImagesAlmostEqual(image, img)
 
+    def test_interpolation(self) -> None:
+        import PIL.Image as Image
+
+        image = Image.open(fate_png())
+        frame = VideoFrame.from_image(image)
+        assert frame.width == 330 and frame.height == 330
+
+        img = frame.to_image(width=200, height=100, interpolation=Interpolation.BICUBIC)
+        assert img.width == 200 and img.height == 100
+
+        img = frame.to_image(width=200, height=100, interpolation="BICUBIC")
+        assert img.width == 200 and img.height == 100
+
+        img = frame.to_image(
+            width=200, height=100, interpolation=int(Interpolation.BICUBIC)
+        )
+        assert img.width == 200 and img.height == 100
+
     def test_to_image_rgb24(self) -> None:
         sizes = [(318, 238), (320, 240), (500, 500)]
         for width, height in sizes:
@@ -838,14 +857,20 @@ def test_reformat_identity() -> None:
 
 
 def test_reformat_colorspace() -> None:
-    # This is allowed.
     frame = VideoFrame(640, 480, "rgb24")
     frame.reformat(src_colorspace=None, dst_colorspace="smpte240m")
 
-    # I thought this was not allowed, but it seems to be.
+    frame = VideoFrame(640, 480, "rgb24")
+    frame.reformat(src_colorspace=None, dst_colorspace=Colorspace.smpte240m)
+
     frame = VideoFrame(640, 480, "yuv420p")
     frame.reformat(src_colorspace=None, dst_colorspace="smpte240m")
 
+    frame = VideoFrame(640, 480, "rgb24")
+    frame.colorspace = Colorspace.smpte240m
+    assert frame.colorspace == int(Colorspace.smpte240m)
+    assert frame.colorspace == Colorspace.smpte240m
+
 
 def test_reformat_pixel_format_align() -> None:
     height = 480