codec/encoder/prediction: add enum

src/codec/encoder/mod.rs

@@ -10,6 +10,9 @@ pub use self::subtitle::Subtitle;
 pub mod motion_estimation;
 pub use self::motion_estimation::MotionEstimation;
 
+pub mod prediction;
+pub use self::prediction::Prediction;
+
 use std::ffi::CString;
 use std::ptr;
 use std::ops::Deref;

src/codec/encoder/prediction.rs

@@ -0,0 +1,31 @@
+use libc::c_int;
+use ffi::*;
+
+#[derive(Eq, PartialEq, Clone, Copy, Debug)]
+pub enum Prediction {
+	Left,
+	Plane,
+	Median,
+}
+
+impl From<c_int> for Prediction {
+	fn from(value: c_int) -> Prediction {
+		match value {
+			FF_PRED_LEFT   => Prediction::Left,
+			FF_PRED_PLANE  => Prediction::Plane,
+			FF_PRED_MEDIAN => Prediction::Median,
+
+			_ => Prediction::Left
+		}
+	}
+}
+
+impl Into<c_int> for Prediction {
+	fn into(self) -> c_int {
+		match self {
+			Prediction::Left   => FF_PRED_LEFT,
+			Prediction::Plane  => FF_PRED_PLANE,
+			Prediction::Median => FF_PRED_MEDIAN,
+		}
+	}
+}