Change Format_Invalid from enum to global const
This is in preparation for changing the typedef to a struct
Change-Id: I36d1fe81d2f974224750f753453753303c224591
diff --git a/include/media/nbaio/NBAIO.h b/include/media/nbaio/NBAIO.h
index b809351..9c9721a 100644
--- a/include/media/nbaio/NBAIO.h
+++ b/include/media/nbaio/NBAIO.h
@@ -53,9 +53,8 @@
// too large, then this decision should be re-visited.
// Sample rate and channel count are explicit, PCM interleaved 16-bit is assumed.
typedef unsigned NBAIO_Format;
-enum {
- Format_Invalid
-};
+
+extern const NBAIO_Format Format_Invalid;
// Return the frame size of an NBAIO_Format in bytes
size_t Format_frameSize(const NBAIO_Format& format);