diff --git a/libs/audioflinger/AudioFlinger.h b/libs/audioflinger/AudioFlinger.h
index 77f064b..dfbb1e9 100644
--- a/libs/audioflinger/AudioFlinger.h
+++ b/libs/audioflinger/AudioFlinger.h
@@ -223,7 +223,10 @@
             enum track_flags {
                 STEPSERVER_FAILED = 0x01, //  StepServer could not acquire cblk->lock mutex
                 SYSTEM_FLAGS_MASK = 0x0000ffffUL,
-                // The upper 16 bits are used for track-specific flags.
+
+                AUDIO_IN_AGC_ENABLE = AudioSystem::AGC_ENABLE << 16,
+                AUDIO_IN_NS_ENABLE  = AudioSystem::NS_ENABLE << 16,
+                AUDIO_IN_IIR_ENABLE = AudioSystem::TX_IIR_ENABLE << 16
             };
 
                                 TrackBase(const sp<MixerThread>& mixerThread,