Some syntactic cleanup

Mostly, this change renames HeadTrackingMode to
SpatializerHeadTrackingMode in order to avoid name collision with the
HeadTrackingMode type from libheadtracking.

Other nits are included.

Test: m -j
Bug: 188502620
Change-Id: I7f4188c1f401a98044f28c68d9613267d5baa808
diff --git a/media/libaudioclient/Android.bp b/media/libaudioclient/Android.bp
index 4ab9b28..9d90b50 100644
--- a/media/libaudioclient/Android.bp
+++ b/media/libaudioclient/Android.bp
@@ -388,9 +388,9 @@
         "aidl/android/media/AudioProductStrategy.aidl",
         "aidl/android/media/AudioVolumeGroup.aidl",
         "aidl/android/media/DeviceRole.aidl",
-        "aidl/android/media/HeadTrackingMode.aidl",
         "aidl/android/media/SoundTriggerSession.aidl",
         "aidl/android/media/SpatializationLevel.aidl",
+        "aidl/android/media/SpatializerHeadTrackingMode.aidl",
     ],
     imports: [
         "audio_common-aidl",
diff --git a/media/libaudioclient/aidl/android/media/ISpatializer.aidl b/media/libaudioclient/aidl/android/media/ISpatializer.aidl
index 212d8fe..3c2eda6 100644
--- a/media/libaudioclient/aidl/android/media/ISpatializer.aidl
+++ b/media/libaudioclient/aidl/android/media/ISpatializer.aidl
@@ -16,8 +16,8 @@
 
 package android.media;
 
-import android.media.HeadTrackingMode;
 import android.media.SpatializationLevel;
+import android.media.SpatializerHeadTrackingMode;
 
 /**
  * The ISpatializer interface is used to control the native audio service implementation
@@ -47,22 +47,23 @@
     /** Gets the selected spatialization level (see SpatializationLevel.aidl) */
     SpatializationLevel getLevel();
 
-    /** Reports the list of supported head tracking modes (see HeadTrackingMode.aidl). The list can
-     * be empty if the spatializer implementation does not support head tracking or if no
-     * head tracking device is connected.
+    /** Reports the list of supported head tracking modes (see SpatializerHeadTrackingMode.aidl).
+     * The list can be empty if the spatializer implementation does not support head tracking or if
+     * no head tracking device is connected.
      */
-    HeadTrackingMode[] getSupportedHeadTrackingModes();
+    SpatializerHeadTrackingMode[] getSupportedHeadTrackingModes();
 
-    /** Selects the desired head tracking mode (see HeadTrackingMode.aidl) */
-    void setDesiredHeadTrackingMode(HeadTrackingMode mode);
+    /** Selects the desired head tracking mode (see SpatializerHeadTrackingMode.aidl) */
+    void setDesiredHeadTrackingMode(SpatializerHeadTrackingMode mode);
 
     /** Gets the actual head tracking mode. Can be different from the desired mode if conditions to
      * enable the desired mode are not met (e.g if the head tracking device was removed)
      */
-    HeadTrackingMode getActualHeadTrackingMode();
+    SpatializerHeadTrackingMode getActualHeadTrackingMode();
 
     /** Reset the head tracking algorithm to consider current head pose as neutral */
-    void recenterHeadtracker();
+    void recenterHeadTracker();
+
     /** Set the screen to stage transform to use by the head tracking algorithm */
     void setGlobalTransform(in float[] screenToStage);
 }
diff --git a/media/libaudioclient/aidl/android/media/HeadTrackingMode.aidl b/media/libaudioclient/aidl/android/media/SpatializerHeadTrackingMode.aidl
similarity index 90%
rename from media/libaudioclient/aidl/android/media/HeadTrackingMode.aidl
rename to media/libaudioclient/aidl/android/media/SpatializerHeadTrackingMode.aidl
index d6cf410..58e0f61 100644
--- a/media/libaudioclient/aidl/android/media/HeadTrackingMode.aidl
+++ b/media/libaudioclient/aidl/android/media/SpatializerHeadTrackingMode.aidl
@@ -18,12 +18,12 @@
 
 
 /**
- * The head tracking mode supported by the spatializer stage effect implementation.
+ * The head tracking mode supported by the spatializer effect implementation.
  * Used by methods of the ISpatializer interface.
  * {@hide}
  */
 @Backing(type="byte")
-enum HeadTrackingMode {
+enum SpatializerHeadTrackingMode {
     /** Head tracking is active in a mode not listed below (forward compatibility) */
     OTHER = 0,
     /** Head tracking is disabled */