diff --git a/Cargo.toml b/Cargo.toml
index 32ae470..e3a82af 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,23 @@ version = "0.1.0"
 authors = ["meh. <meh@schizofreni.co>"]
 license = "WTFPL"
 
+[features]
+default = ["codec", "device", "filter", "format", "resample", "postprocessing", "software-resample", "software-scaling"]
+
+codec             = ["ffmpeg-sys/avcodec"]
+device            = ["ffmpeg-sys/avdevice", "format"]
+filter            = ["ffmpeg-sys/avfilter"]
+format            = ["ffmpeg-sys/avformat", "codec"]
+resample          = ["ffmpeg-sys/avresample"]
+postprocessing    = ["ffmpeg-sys/postproc"]
+software-resample = ["ffmpeg-sys/swresample"]
+software-scaling  = ["ffmpeg-sys/swscale"]
+
 [dependencies]
 libc = "0.1"
 bitflags = "0.1"
-ffmpeg-sys = "2.6.2"
+
+[dependencies.ffmpeg-sys]
+version = "2.6.2"
+
+default-features = false
diff --git a/src/device/extensions.rs b/src/device/extensions.rs
new file mode 100644
index 0000000..0e78a7e
--- /dev/null
+++ b/src/device/extensions.rs
@@ -0,0 +1,67 @@
+use std::ptr;
+use std::marker::PhantomData;
+
+use ffi::*;
+use ::Error;
+use ::format::Context;
+use ::device;
+use libc::c_int;
+
+impl Context {
+	pub fn devices(&self) -> Result<DeviceIter, Error> {
+		DeviceIter::new(self.ptr)
+	}
+}
+
+pub struct DeviceIter<'a> {
+	ptr: *mut AVDeviceInfoList,
+	cur: c_int,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> DeviceIter<'a> {
+	pub fn new(ctx: *mut AVFormatContext) -> Result<Self, Error> {
+		unsafe {
+			let mut ptr: *mut AVDeviceInfoList = ptr::null_mut();
+
+			match avdevice_list_devices(ctx, &mut ptr) {
+				n if n < 0 =>
+					Err(Error::new(n)),
+
+				_ =>
+					Ok(DeviceIter { ptr: ptr, cur: 0, _marker: PhantomData })
+			}
+		}
+	}
+
+	pub fn default(&self) -> usize {
+		unsafe {
+			(*self.ptr).default_device as usize
+		}
+	}
+}
+
+impl<'a> Drop for DeviceIter<'a> {
+	fn drop(&mut self) {
+		unsafe {
+			avdevice_free_list_devices(&mut self.ptr);
+		}
+	}
+}
+
+impl<'a> Iterator for DeviceIter<'a> {
+	type Item = device::Info<'a>;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if self.cur >= (*self.ptr).nb_devices {
+				None
+			}
+			else {
+				self.cur += 1;
+				Some(device::Info::wrap(*(*self.ptr).devices.offset((self.cur - 1) as isize)))
+			}
+		}
+	}
+}
diff --git a/src/device/mod.rs b/src/device/mod.rs
index fb06bf2..5bc8ac1 100644
--- a/src/device/mod.rs
+++ b/src/device/mod.rs
@@ -1,5 +1,6 @@
 pub mod input;
 pub mod output;
+pub mod extensions;
 
 use std::ffi::CStr;
 use std::str::from_utf8_unchecked;
diff --git a/src/format/context.rs b/src/format/context.rs
index ca904c9..95cd667 100644
--- a/src/format/context.rs
+++ b/src/format/context.rs
@@ -4,10 +4,9 @@ use std::path::Path;
 use std::marker::PhantomData;
 use std::ops::Deref;
 
-use libc::{c_int, c_uint};
+use libc::c_uint;
 use ffi::*;
 use ::{Error, Dictionary, Codec, Stream, Format};
-use ::device;
 
 pub struct Context {
 	pub ptr: *mut AVFormatContext,
@@ -38,10 +37,6 @@ impl Context {
 		StreamIter::new(self.ptr)
 	}
 
-	pub fn devices(&self) -> Result<DeviceIter, Error> {
-		DeviceIter::new(self.ptr)
-	}
-
 	pub fn probe_score(&self) -> i32 {
 		unsafe {
 			av_format_get_probe_score(self.ptr)
@@ -217,59 +212,6 @@ impl<'a> Iterator for StreamIter<'a> {
 	}
 }
 
-pub struct DeviceIter<'a> {
-	ptr: *mut AVDeviceInfoList,
-	cur: c_int,
-
-	_marker: PhantomData<&'a ()>,
-}
-
-impl<'a> DeviceIter<'a> {
-	pub fn new(ctx: *mut AVFormatContext) -> Result<Self, Error> {
-		unsafe {
-			let mut ptr: *mut AVDeviceInfoList = ptr::null_mut();
-
-			match avdevice_list_devices(ctx, &mut ptr) {
-				n if n < 0 =>
-					Err(Error::new(n)),
-
-				_ =>
-					Ok(DeviceIter { ptr: ptr, cur: 0, _marker: PhantomData })
-			}
-		}
-	}
-
-	pub fn default(&self) -> usize {
-		unsafe {
-			(*self.ptr).default_device as usize
-		}
-	}
-}
-
-impl<'a> Drop for DeviceIter<'a> {
-	fn drop(&mut self) {
-		unsafe {
-			avdevice_free_list_devices(&mut self.ptr);
-		}
-	}
-}
-
-impl<'a> Iterator for DeviceIter<'a> {
-	type Item = device::Info<'a>;
-
-	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
-		unsafe {
-			if self.cur >= (*self.ptr).nb_devices {
-				None
-			}
-			else {
-				self.cur += 1;
-				Some(device::Info::wrap(*(*self.ptr).devices.offset((self.cur - 1) as isize)))
-			}
-		}
-	}
-}
-
 pub fn open(path: &Path) -> Result<Context, Error> {
 	unsafe {
 		let mut ps     = ptr::null_mut();
diff --git a/src/lib.rs b/src/lib.rs
index b0c118a..fa30851 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,19 +12,32 @@ pub use util::rational::Rational;
 pub use util::media;
 pub use util::picture;
 pub use util::color;
+pub use util::chroma;
 pub use util::frame::{self, Frame};
 
+#[cfg(feature = "format")]
 pub mod format;
+#[cfg(feature = "format")]
 pub use format::format::Format;
+#[cfg(feature = "format")]
 pub use format::stream::Stream;
 
+#[cfg(feature = "codec")]
 pub mod codec;
+#[cfg(feature = "codec")]
 pub use codec::packet::{self, Packet};
+#[cfg(feature = "codec")]
 pub use codec::subtitle::{self, Subtitle};
+#[cfg(feature = "codec")]
 pub use codec::picture::Picture;
+#[cfg(feature = "codec")]
 pub use codec::discard::Discard;
+#[cfg(feature = "codec")]
 pub use codec::codec::Codec;
+#[cfg(feature = "codec")]
 pub use codec::encoder::{self, Encode};
+#[cfg(feature = "codec")]
 pub use codec::decoder::{self, Decode};
 
+#[cfg(feature = "device")]
 pub mod device;