diff --git a/include/media/AudioParameter.h b/include/media/AudioParameter.h
index 99e2a6d..ea03a90 100644
--- a/include/media/AudioParameter.h
+++ b/include/media/AudioParameter.h
@@ -58,9 +58,23 @@
     static const char * const keyMonoOutput;
     static const char * const keyStreamHwAvSync;
 
+    //  keyStreamConnect / Disconnect: value is an int in audio_devices_t
+    static const char * const keyStreamConnect;
+    static const char * const keyStreamDisconnect;
+
+    // For querying stream capabilities. All the returned values are lists.
+    //   keyStreamSupportedFormats: audio_format_t
+    //   keyStreamSupportedChannels: audio_channel_mask_t
+    //   keyStreamSupportedSamplingRates: sampling rate values
+    static const char * const keyStreamSupportedFormats;
+    static const char * const keyStreamSupportedChannels;
+    static const char * const keyStreamSupportedSamplingRates;
+
     static const char * const valueOn;
     static const char * const valueOff;
 
+    static const char * const valueListSeparator;
+
     String8 toString();
 
     status_t add(const String8& key, const String8& value);