codec: refactor decoder and encoder

src/codec/encoder/subtitle.rs

@@ -0,0 +1,28 @@
+use std::ops::Deref;
+
+use libc::c_int;
+use ffi::*;
+
+use super::Encoder;
+use ::Error;
+
+pub struct Subtitle(pub Encoder);
+
+impl Subtitle {
+	pub fn encode(&self, subtitle: &::Subtitle, out: &mut [u8]) -> Result<bool, Error> {
+		unsafe {
+			match avcodec_encode_subtitle(self.ptr, out.as_mut_ptr(), out.len() as c_int, &subtitle.val) {
+				e if e < 0 => Err(Error::new(e)),
+				_          => Ok(true)
+			}
+		}
+	}
+}
+
+impl Deref for Subtitle {
+	type Target = Encoder;
+
+	fn deref(&self) -> &<Self as Deref>::Target {
+		&self.0
+	}
+}