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 */
diff --git a/services/audiopolicy/service/Spatializer.cpp b/services/audiopolicy/service/Spatializer.cpp
index 345665c..aa104a0 100644
--- a/services/audiopolicy/service/Spatializer.cpp
+++ b/services/audiopolicy/service/Spatializer.cpp
@@ -40,8 +40,8 @@
 using aidl_utils::binderStatusFromStatusT;
 using android::content::AttributionSourceState;
 using binder::Status;
-using media::HeadTrackingMode;
 using media::SpatializationLevel;
+using media::SpatializerHeadTrackingMode;
 
 #define VALUE_OR_RETURN_BINDER_STATUS(x) \
     ({ auto _tmp = (x); \
@@ -177,7 +177,7 @@
 }
 
 Status Spatializer::getSupportedHeadTrackingModes(
-        std::vector<media::HeadTrackingMode>* modes) {
+        std::vector<media::SpatializerHeadTrackingMode>* modes) {
     ALOGV("%s", __func__);
     if (modes == nullptr) {
         return binderStatusFromStatusT(BAD_VALUE);
@@ -186,14 +186,14 @@
     // - The engine capabilities
     // - If a head tracking sensor is registered and linked to a connected audio device
     // - if we have indications on the screen orientation
-    modes->push_back(HeadTrackingMode::RELATIVE_WORLD);
+    modes->push_back(SpatializerHeadTrackingMode::RELATIVE_WORLD);
     return Status::ok();
 }
 
-Status Spatializer::setDesiredHeadTrackingMode(media::HeadTrackingMode mode) {
+Status Spatializer::setDesiredHeadTrackingMode(media::SpatializerHeadTrackingMode mode) {
     ALOGV("%s level %d", __func__, (int)mode);
-    if (mode != HeadTrackingMode::DISABLED
-            && mode != HeadTrackingMode::RELATIVE_WORLD) {
+    if (mode != SpatializerHeadTrackingMode::DISABLED
+            && mode != SpatializerHeadTrackingMode::RELATIVE_WORLD) {
         return binderStatusFromStatusT(BAD_VALUE);
     }
     {
@@ -203,7 +203,7 @@
     return Status::ok();
 }
 
-Status Spatializer::getActualHeadTrackingMode(media::HeadTrackingMode *mode) {
+Status Spatializer::getActualHeadTrackingMode(media::SpatializerHeadTrackingMode *mode) {
     if (mode == nullptr) {
         return binderStatusFromStatusT(BAD_VALUE);
     }
@@ -213,7 +213,7 @@
     return Status::ok();
 }
 
-Status Spatializer::recenterHeadtracker() {
+Status Spatializer::recenterHeadTracker() {
     return Status::ok();
 }
 
@@ -259,10 +259,9 @@
     // create FX instance on output
     AttributionSourceState attributionSource = AttributionSourceState();
     mEngine = new AudioEffect(attributionSource);
-    mEngine->set(nullptr, &mEngineDescriptor.uuid, 0,
-                 Spatializer::engineCallback /* cbf */, this /* user */,
-                 AUDIO_SESSION_OUTPUT_STAGE, output,
-                 {} /* device */, false /* probe */, true /* notifyFramesProcessed */);
+    mEngine->set(nullptr, &mEngineDescriptor.uuid, 0, Spatializer::engineCallback /* cbf */,
+                 this /* user */, AUDIO_SESSION_OUTPUT_STAGE, output, {} /* device */,
+                 false /* probe */, true /* notifyFramesProcessed */);
     status_t status = mEngine->initCheck();
     ALOGV("%s mEngine create status %d", __func__, (int)status);
     if (status != NO_ERROR) {
diff --git a/services/audiopolicy/service/Spatializer.h b/services/audiopolicy/service/Spatializer.h
index f0ab605..768170a 100644
--- a/services/audiopolicy/service/Spatializer.h
+++ b/services/audiopolicy/service/Spatializer.h
@@ -19,7 +19,7 @@
 
 #include <android/media/BnEffect.h>
 #include <android/media/BnSpatializer.h>
-#include <android/media/HeadTrackingMode.h>
+#include <android/media/SpatializerHeadTrackingMode.h>
 #include <android/media/SpatializationLevel.h>
 
 #include <media/AudioEffect.h>
@@ -93,10 +93,12 @@
     binder::Status setLevel(media::SpatializationLevel level) override;
     binder::Status getLevel(media::SpatializationLevel *level) override;
     binder::Status getSupportedHeadTrackingModes(
-            std::vector<media::HeadTrackingMode>* modes) override;
-    binder::Status setDesiredHeadTrackingMode(media::HeadTrackingMode mode) override;
-    binder::Status getActualHeadTrackingMode(media::HeadTrackingMode *mode) override;
-    binder::Status recenterHeadtracker() override;
+            std::vector<media::SpatializerHeadTrackingMode>* modes) override;
+    binder::Status setDesiredHeadTrackingMode(
+            media::SpatializerHeadTrackingMode mode) override;
+    binder::Status getActualHeadTrackingMode(
+            media::SpatializerHeadTrackingMode* mode) override;
+    binder::Status recenterHeadTracker() override;
     binder::Status setGlobalTransform(const std::vector<float>& screenToStage) override;
 
     /** IBinder::DeathRecipient. Listen to the death of the INativeSpatializerCallback. */
@@ -190,8 +192,8 @@
     /** Requested spatialization level */
     media::SpatializationLevel mLevel GUARDED_BY(mLock) = media::SpatializationLevel::NONE;
     /** Requested head tracking mode */
-    media::HeadTrackingMode mHeadTrackingMode GUARDED_BY(mLock)
-            = media::HeadTrackingMode::DISABLED;
+    media::SpatializerHeadTrackingMode mHeadTrackingMode GUARDED_BY(mLock)
+            = media::SpatializerHeadTrackingMode::DISABLED;
     /** Configured screen to stage transform */
     std::vector<float> mScreenToStageTransform GUARDED_BY(mLock);