codec: add various Codec related stuff

src/codec/codec.rs

@@ -0,0 +1,61 @@
+use std::marker::PhantomData;
+use std::ffi::CStr;
+use std::str::from_utf8_unchecked;
+
+use ffi::*;
+use super::{Id, Context};
+use ::media;
+use ::Error;
+use ::codec::context::Opened;
+
+pub struct Codec<'a> {
+	pub ptr: *mut AVCodec,
+
+	_marker: PhantomData<&'a i32>,
+}
+
+impl<'a> Codec<'a> {
+	pub fn wrap(ptr: *mut AVCodec) -> Self {
+		Codec { ptr: ptr, _marker: PhantomData }
+	}
+
+	pub fn open(&self) -> Result<Opened<'a>, Error> {
+		Context::new().open(self)
+	}
+
+	pub fn is_encoder(&self) -> bool {
+		unsafe {
+			av_codec_is_encoder(self.ptr) != 0
+		}
+	}
+
+	pub fn is_decoder(&self) -> bool {
+		unsafe {
+			av_codec_is_decoder(self.ptr) != 0
+		}
+	}
+
+	pub fn name(&'a self) -> &'a str {
+		unsafe {
+			from_utf8_unchecked(CStr::from_ptr((*self.ptr).name).to_bytes())
+		}
+	}
+
+	pub fn description(&'a self) -> &'a str {
+		unsafe {
+			from_utf8_unchecked(CStr::from_ptr((*self.ptr).long_name).to_bytes())
+		}
+	}
+
+	pub fn kind(&self) -> media::Type {
+		unsafe {
+			media::Type::from((*self.ptr).kind)
+		}
+	}
+
+	pub fn id(&self) -> Id {
+		unsafe {
+			Id::from((*self.ptr).id)
+		}
+	}
+}