FastPath: post clang-tidy cleanup

Test: atest AudioTrackTest AudioRecordTest
Bug: 284390461
Merged-In: I2b58bbbab817a1aa8768cc9d1f1fedf1c8035120
Change-Id: I2b58bbbab817a1aa8768cc9d1f1fedf1c8035120
(cherry picked from commit fb81747f310bd5578cdd4ab4627e540512491caa)
diff --git a/services/audioflinger/fastpath/AutoPark.h b/services/audioflinger/fastpath/AutoPark.h
index 6e68327..d71a305 100644
--- a/services/audioflinger/fastpath/AutoPark.h
+++ b/services/audioflinger/fastpath/AutoPark.h
@@ -25,7 +25,6 @@
     // Park the specific FastThread, which can be nullptr, in hot idle if not currently idling
     explicit AutoPark(const sp<T>& fastThread) : mFastThread(fastThread)
     {
-        mPreviousCommand = FastThreadState::HOT_IDLE;
         if (fastThread != nullptr) {
             auto sq = mFastThread->sq();
             FastThreadState *state = sq->begin();
@@ -57,7 +56,7 @@
 private:
     const sp<T>                 mFastThread;
     // if !&IDLE, holds the FastThread state to restore after new parameters processed
-    FastThreadState::Command    mPreviousCommand;
+    FastThreadState::Command    mPreviousCommand = FastThreadState::HOT_IDLE;
 };  // class AutoPark
 
 }   // namespace android
diff --git a/services/audioflinger/fastpath/FastMixer.h b/services/audioflinger/fastpath/FastMixer.h
index 48b94a3..6e48df6 100644
--- a/services/audioflinger/fastpath/FastMixer.h
+++ b/services/audioflinger/fastpath/FastMixer.h
@@ -80,12 +80,13 @@
                                         // if sink format is different than mixer output.
     size_t          mSinkBufferSize = 0;
     uint32_t        mSinkChannelCount = FCC_2;
-    audio_channel_mask_t mSinkChannelMask;
+    audio_channel_mask_t mSinkChannelMask;        // set in ctor
     void*           mMixerBuffer = nullptr;       // mixer output buffer.
     size_t          mMixerBufferSize = 0;
     static constexpr audio_format_t mMixerBufferFormat = AUDIO_FORMAT_PCM_FLOAT;
 
-    uint32_t        mAudioChannelCount; // audio channel count, excludes haptic channels.
+    // audio channel count, excludes haptic channels.  Set in onStateChange().
+    uint32_t        mAudioChannelCount = 0;
 
     enum {UNDEFINED, MIXED, ZEROED} mMixerBufferState = UNDEFINED;
     NBAIO_Format    mFormat{Format_Invalid};
@@ -103,7 +104,7 @@
     // accessed without lock between multiple threads.
     std::atomic_bool mMasterMono{};
     std::atomic<float> mMasterBalance{};
-    std::atomic_int_fast64_t mBoottimeOffset;
+    std::atomic_int_fast64_t mBoottimeOffset{};
 
     // parent thread id for debugging purposes
     [[maybe_unused]] const audio_io_handle_t mThreadIoHandle;
diff --git a/services/audioflinger/fastpath/FastMixerDumpState.h b/services/audioflinger/fastpath/FastMixerDumpState.h
index 1b0e029..4d2e1a0 100644
--- a/services/audioflinger/fastpath/FastMixerDumpState.h
+++ b/services/audioflinger/fastpath/FastMixerDumpState.h
@@ -56,7 +56,7 @@
 struct FastTrackDump {
     FastTrackUnderruns  mUnderruns;
     size_t              mFramesReady = 0;    // most recent value only; no long-term statistics kept
-    int64_t             mFramesWritten;      // last value from track
+    int64_t             mFramesWritten = 0;  // last value from track
 };
 
 // No virtuals.
diff --git a/services/audioflinger/fastpath/FastMixerState.h b/services/audioflinger/fastpath/FastMixerState.h
index fdf3eaa..c70e42a 100644
--- a/services/audioflinger/fastpath/FastMixerState.h
+++ b/services/audioflinger/fastpath/FastMixerState.h
@@ -37,7 +37,7 @@
     // The provider implementation is responsible for validating that the return value is in range.
     virtual gain_minifloat_packed_t getVolumeLR() = 0;
 protected:
-    VolumeProvider() { }
+    VolumeProvider() = default;
     virtual ~VolumeProvider() = default;
 };
 
@@ -63,12 +63,12 @@
 
 // Represents a single state of the fast mixer
 struct FastMixerState : FastThreadState {
-                FastMixerState();
+    FastMixerState();
 
     // These are the minimum, maximum, and default values for maximum number of fast tracks
-    static const unsigned kMinFastTracks = 2;
-    static const unsigned kMaxFastTracks = 32;
-    static const unsigned kDefaultFastTracks = 8;
+    static constexpr unsigned kMinFastTracks = 2;
+    static constexpr unsigned kMaxFastTracks = 32;
+    static constexpr unsigned kDefaultFastTracks = 8;
 
     static unsigned sMaxFastTracks;             // Configured maximum number of fast tracks
     static pthread_once_t sMaxFastTracksOnce;   // Protects initializer for sMaxFastTracks
diff --git a/services/audioflinger/fastpath/StateQueue.h b/services/audioflinger/fastpath/StateQueue.h
index 29d1809..36d986b 100644
--- a/services/audioflinger/fastpath/StateQueue.h
+++ b/services/audioflinger/fastpath/StateQueue.h
@@ -123,11 +123,10 @@
 #endif
 
 // manages a FIFO queue of states
-template<typename T> class StateQueue {
+// marking as final to avoid derived classes as there are no virtuals.
+template<typename T> class StateQueue final {
 
 public:
-    virtual ~StateQueue() = default;  // why is this virtual?
-
     // Observer APIs
 
     // Poll for a state change.  Returns a pointer to a read-only state,