util/frame: add some more accessors

src/util/chroma/location.rs

@@ -0,0 +1,41 @@
+use ffi::*;
+
+#[derive(Eq, PartialEq, Clone, Copy, Debug)]
+pub enum Location {
+	Unspecified,
+	Left,
+	Center,
+	TopLeft,
+	Top,
+	BottomLeft,
+	Bottom,
+}
+
+impl From<AVChromaLocation> for Location {
+	fn from(value: AVChromaLocation) -> Self {
+		match value {
+			AVCHROMA_LOC_UNSPECIFIED => Location::Unspecified,
+			AVCHROMA_LOC_LEFT        => Location::Left,
+			AVCHROMA_LOC_CENTER      => Location::Center,
+			AVCHROMA_LOC_TOPLEFT     => Location::TopLeft,
+			AVCHROMA_LOC_TOP         => Location::Top,
+			AVCHROMA_LOC_BOTTOMLEFT  => Location::BottomLeft,
+			AVCHROMA_LOC_BOTTOM      => Location::Bottom,
+			AVCHROMA_LOC_NB          => Location::Unspecified
+		}
+	}
+}
+
+impl Into<AVChromaLocation> for Location {
+	fn into(self) -> AVChromaLocation {
+		match self {
+			Location::Unspecified => AVCHROMA_LOC_UNSPECIFIED,
+			Location::Left        => AVCHROMA_LOC_LEFT,
+			Location::Center      => AVCHROMA_LOC_CENTER,
+			Location::TopLeft     => AVCHROMA_LOC_TOPLEFT,
+			Location::Top         => AVCHROMA_LOC_TOP,
+			Location::BottomLeft  => AVCHROMA_LOC_BOTTOMLEFT,
+			Location::Bottom      => AVCHROMA_LOC_BOTTOM
+		}
+	}
+}