codec/decoder: add error checking

src/codec/decoder/check.rs

@@ -0,0 +1,16 @@
+use libc::c_int;
+use ffi::*;
+
+bitflags! {
+	flags Check: c_int {
+		const CHECK_CRC      = AV_EF_CRCCHECK,
+		const CHECK_BISTREAM = AV_EF_BITSTREAM,
+		const CHECK_BUFFER   = AV_EF_BUFFER,
+		const CHECK_EXPLODE  = AV_EF_EXPLODE,
+
+		const CHECK_IGNORE_ERROR = AV_EF_IGNORE_ERR,
+		const CHECK_CAREFUL      = AV_EF_CAREFUL,
+		const CHECK_COMPLIANT    = AV_EF_COMPLIANT,
+		const CHECK_AGGRESSIVE   = AV_EF_AGGRESSIVE,
+	}
+}