codec: refactor decoder and encoder

src/codec/encoder/audio.rs

@@ -0,0 +1,31 @@
+use std::ops::Deref;
+
+use libc::c_int;
+use ffi::*;
+
+use super::Encoder;
+use ::{Packet, Error};
+use ::frame;
+
+pub struct Audio(pub Encoder);
+
+impl Audio {
+	pub fn encode(&self, frame: &frame::Audio, out: &mut Packet) -> Result<bool, Error> {
+		unsafe {
+			let mut got: c_int = 0;
+
+			match avcodec_encode_audio2(self.ptr, &mut out.val, frame.ptr, &mut got) {
+				e if e < 0 => Err(Error::new(e)),
+				_          => Ok(got != 0)
+			}
+		}
+	}
+}
+
+impl Deref for Audio {
+	type Target = Encoder;
+
+	fn deref(&self) -> &<Self as Deref>::Target {
+		&self.0
+	}
+}