diff --git a/src/codec/context.rs b/src/codec/context.rs
index 760d37b..2202d22 100644
--- a/src/codec/context.rs
+++ b/src/codec/context.rs
@@ -68,18 +68,6 @@ impl Context {
 		}
 	}
 
-	pub fn bit_rate(&self) -> usize {
-		unsafe {
-			(*self.as_ptr()).bit_rate as usize
-		}
-	}
-
-	pub fn delay(&self) -> usize {
-		unsafe {
-			(*self.as_ptr()).delay as usize
-		}
-	}
-
 	pub fn compliance(&mut self, value: Compliance) {
 		unsafe {
 			(*self.as_mut_ptr()).strict_std_compliance = value.into();
diff --git a/src/codec/decoder/mod.rs b/src/codec/decoder/mod.rs
index f02e78f..cff353b 100644
--- a/src/codec/decoder/mod.rs
+++ b/src/codec/decoder/mod.rs
@@ -24,7 +24,7 @@ use std::ops::{Deref, DerefMut};
 
 use ffi::*;
 use super::{Id, Context};
-use ::{Codec, Error, Dictionary};
+use ::{Codec, Error, Discard, Dictionary};
 
 pub struct Decoder(pub Context);
 
@@ -83,6 +83,36 @@ impl Decoder {
 			Err(Error::DecoderNotFound)
 		}
 	}
+
+	pub fn conceal(&mut self, value: Conceal) {
+		unsafe {
+			(*self.as_mut_ptr()).error_concealment = value.bits();
+		}
+	}
+
+	pub fn check(&mut self, value: Check) {
+		unsafe {
+			(*self.as_mut_ptr()).err_recognition = value.bits();
+		}
+	}
+
+	pub fn skip_loop_filter(&mut self, value: Discard) {
+		unsafe {
+			(*self.as_mut_ptr()).skip_loop_filter = value.into();
+		}
+	}
+
+	pub fn skip_idct(&mut self, value: Discard) {
+		unsafe {
+			(*self.as_mut_ptr()).skip_idct = value.into();
+		}
+	}
+
+	pub fn skip_frame(&mut self, value: Discard) {
+		unsafe {
+			(*self.as_mut_ptr()).skip_frame = value.into();
+		}
+	}
 }
 
 impl Deref for Decoder {
diff --git a/src/codec/decoder/opened.rs b/src/codec/decoder/opened.rs
index 4228331..789a9d4 100644
--- a/src/codec/decoder/opened.rs
+++ b/src/codec/decoder/opened.rs
@@ -1,10 +1,9 @@
 use std::ops::{Deref, DerefMut};
-use std::slice::from_raw_parts;
 
 use ffi::*;
-use super::{Conceal, Check, Video, Audio, Subtitle, Decoder};
+use super::{Video, Audio, Subtitle, Decoder};
 use ::codec::Profile;
-use ::{Error, Discard, Rational};
+use ::{Error, Rational};
 use ::media;
 
 pub struct Opened(pub Decoder);
@@ -37,15 +36,15 @@ impl Opened {
 		}
 	}
 
-	pub fn conceal(&mut self, value: Conceal) {
+	pub fn bit_rate(&self) -> usize {
 		unsafe {
-			(*self.as_mut_ptr()).error_concealment = value.bits();
+			(*self.as_ptr()).bit_rate as usize
 		}
 	}
 
-	pub fn check(&mut self, value: Check) {
+	pub fn delay(&self) -> usize {
 		unsafe {
-			(*self.as_mut_ptr()).err_recognition = value.bits();
+			(*self.as_ptr()).delay as usize
 		}
 	}
 
@@ -55,30 +54,6 @@ impl Opened {
 		}
 	}
 
-	pub fn skip_loop_filter(&mut self, value: Discard) {
-		unsafe {
-			(*self.as_mut_ptr()).skip_loop_filter = value.into();
-		}
-	}
-
-	pub fn skip_idct(&mut self, value: Discard) {
-		unsafe {
-			(*self.as_mut_ptr()).skip_idct = value.into();
-		}
-	}
-
-	pub fn skip_frame(&mut self, value: Discard) {
-		unsafe {
-			(*self.as_mut_ptr()).skip_frame = value.into();
-		}
-	}
-
-	pub fn subtitle_header(&self) -> &[u8] {
-		unsafe {
-			from_raw_parts((*self.as_ptr()).subtitle_header, (*self.as_ptr()).subtitle_header_size as usize)
-		}
-	}
-
 	pub fn frame_rate(&self) -> Option<Rational> {
 		unsafe {
 			let value = (*self.as_ptr()).framerate;
@@ -91,12 +66,6 @@ impl Opened {
 			}
 		}
 	}
-
-	pub fn time_base(&self) -> Rational {
-		unsafe {
-			Rational::from((*self.as_ptr()).time_base)
-		}
-	}
 }
 
 impl Drop for Opened {
diff --git a/src/codec/decoder/video.rs b/src/codec/decoder/video.rs
index 47d1cf5..318f388 100644
--- a/src/codec/decoder/video.rs
+++ b/src/codec/decoder/video.rs
@@ -42,12 +42,6 @@ impl Video {
 		}
 	}
 
-	pub fn set_format(&mut self, value: format::Pixel) {
-		unsafe {
-			(*self.as_mut_ptr()).pix_fmt = value.into();
-		}
-	}
-
 	pub fn has_b_frames(&self) -> bool {
 		unsafe {
 			(*self.as_ptr()).has_b_frames != 0