codec/packet/flag: change flags API style

src/codec/packet/flag.rs

@@ -0,0 +1,9 @@
+use libc::c_int;
+use ffi::*;
+
+bitflags! {
+	flags Flags: c_int {
+		const KEY     = AV_PKT_FLAG_KEY,
+		const CORRUPT = AV_PKT_FLAG_CORRUPT,
+	}
+}

src/codec/packet/mod.rs

@@ -1,19 +1,15 @@
-mod side_data;
+pub mod side_data;
 pub use self::side_data::SideData;
 
+pub mod flag;
+pub use self::flag::Flags;
+
 use std::marker::PhantomData;
 use std::mem;
 use libc::c_int;
 
 use ffi::*;
 
-bitflags! {
-	flags Flags: c_int {
-		const FLAG_KEY     = AV_PKT_FLAG_KEY,
-		const FLAG_CORRUPT = AV_PKT_FLAG_CORRUPT,
-	}
-}
-
 pub struct Packet {
 	pub val: AVPacket,
 }