diff --git a/fake/fake.go b/fake/fake.go
new file mode 100644
index 0000000..90c20f3
--- /dev/null
+++ b/fake/fake.go
@@ -0,0 +1,14 @@
+package fake
+
+import (
+	"github.com/nareix/av"
+)
+
+type CodecData struct {
+	Typ av.CodecType
+}
+
+func (self CodecData) Type() av.CodecType {
+	return self.Typ
+}
+