AudioService: filter flags in volume methods

Strip FIXED_VOLUME flag in setStreamVolume() and
adjustStreamVolume() as this flag is reserved for
framework use.

Bug 4335692.

Change-Id: I507582270f4c4cd631ee81fe50dca895bb6352b3

Author: Eric Laurent

media/java/android/media/AudioService.java

@@ -733,7 +733,7 @@ public void adjustSuggestedStreamVolume(int direction, int suggestedStreamType,
 
         if (streamType == STREAM_REMOTE_MUSIC) {
             // don't play sounds for remote
-            flags &= ~AudioManager.FLAG_PLAY_SOUND;
+            flags &= ~(AudioManager.FLAG_PLAY_SOUND|AudioManager.FLAG_FIXED_VOLUME);
             //if (DEBUG_VOL) Log.i(TAG, "Need to adjust remote volume: calling adjustRemoteVolume()");
             adjustRemoteVolume(AudioSystem.STREAM_MUSIC, direction, flags);
         } else {
@@ -771,6 +771,7 @@ public void adjustStreamVolume(int streamType, int direction, int flags) {
         int index;
         int oldIndex;
 
+        flags &= ~AudioManager.FLAG_FIXED_VOLUME;
         if ((streamTypeAlias == AudioSystem.STREAM_MUSIC) &&
                ((device & mFixedVolumeDevices) != 0)) {
             flags |= AudioManager.FLAG_FIXED_VOLUME;
@@ -855,6 +856,7 @@ public void setStreamVolume(int streamType, int index, int flags) {
         final int device = getDeviceForStream(streamType);
         int oldIndex;
 
+        flags &= ~AudioManager.FLAG_FIXED_VOLUME;
         if ((mStreamVolumeAlias[streamType] == AudioSystem.STREAM_MUSIC) &&
                 ((device & mFixedVolumeDevices) != 0)) {
             flags |= AudioManager.FLAG_FIXED_VOLUME;