diff --git a/media/TEST_MAPPING b/media/TEST_MAPPING
index 35205e5..a22ec19 100644
--- a/media/TEST_MAPPING
+++ b/media/TEST_MAPPING
@@ -41,8 +41,51 @@
         {
             "path": "frameworks/av/drm/mediadrm/plugins"
         }
+    ],
+
+    "platinum-postsubmit": [
+        // runs regularly, independent of changes in this tree.
+        // signals if changes elsewhere break media functionality
+        // @FlakyTest: in staged-postsubmit, but not postsubmit
+        {
+            "name": "CtsMediaCodecTestCases",
+            "options": [
+                {
+                    "include-filter": "android.media.codec.cts.EncodeDecodeTest"
+                }
+            ]
+        },
+        {
+            "name": "CtsMediaCodecTestCases",
+            "options": [
+                {
+                    "include-filter": "android.media.codec.cts.DecodeEditEncodeTest"
+                },
+                {
+                    "exclude-annotation": "androidx.test.filters.FlakyTest"
+                }
+            ]
+        }
+    ],
+
+    "staged-platinum-postsubmit": [
+        // runs every four hours
+        {
+            "name": "CtsMediaCodecTestCases",
+            "options": [
+                {
+                    "include-filter": "android.media.codec.cts.EncodeDecodeTest"
+                }
+            ]
+        },
+        {
+            "name": "CtsMediaCodecTestCases",
+            "options": [
+                {
+                    "include-filter": "android.media.codec.cts.DecodeEditEncodeTest"
+                }
+            ]
+        }
     ]
 
-    // TODO (b/229286407) Add EncodeDecodeTest and DecodeEditEncodeTest to
-    // platinum-postsubmit once issues in cuttlefish are fixed
 }
diff --git a/media/codec2/sfplugin/CCodec.cpp b/media/codec2/sfplugin/CCodec.cpp
index 296d7ed..124a893 100644
--- a/media/codec2/sfplugin/CCodec.cpp
+++ b/media/codec2/sfplugin/CCodec.cpp
@@ -1899,6 +1899,7 @@
         comp = state->comp;
     }
     status_t err = comp->stop();
+    mChannel->stopUseOutputSurface();
     if (err != C2_OK) {
         // TODO: convert err into status_t
         mCallback->onError(UNKNOWN_ERROR, ACTION_CODE_FATAL);
@@ -1972,6 +1973,7 @@
     }
 
     mChannel->reset();
+    mChannel->stopUseOutputSurface();
     // thiz holds strong ref to this while the thread is running.
     sp<CCodec> thiz(this);
     std::thread([thiz, sendCallback] { thiz->release(sendCallback); }).detach();
@@ -2139,7 +2141,8 @@
 
     std::map<size_t, sp<MediaCodecBuffer>> clientInputBuffers;
     status_t err = mChannel->prepareInitialInputBuffers(&clientInputBuffers);
-    if (err != OK) {
+    // FIXME(b/237656746)
+    if (err != OK && err != NO_MEMORY) {
         ALOGE("Resume request for Input Buffers failed");
         mCallback->onError(err, ACTION_CODE_FATAL);
         return;
diff --git a/media/codec2/sfplugin/CCodecBufferChannel.cpp b/media/codec2/sfplugin/CCodecBufferChannel.cpp
index 3ca263f..4bf8dce 100644
--- a/media/codec2/sfplugin/CCodecBufferChannel.cpp
+++ b/media/codec2/sfplugin/CCodecBufferChannel.cpp
@@ -1578,6 +1578,17 @@
     mFirstValidFrameIndex = mFrameIndex.load(std::memory_order_relaxed);
 }
 
+void CCodecBufferChannel::stopUseOutputSurface() {
+    if (mOutputSurface.lock()->surface) {
+        C2BlockPool::local_id_t outputPoolId;
+        {
+            Mutexed<BlockPools>::Locked pools(mBlockPools);
+            outputPoolId = pools->outputPoolId;
+        }
+        if (mComponent) mComponent->stopUsingOutputSurface(outputPoolId);
+    }
+}
+
 void CCodecBufferChannel::reset() {
     stop();
     if (mInputSurface != nullptr) {
@@ -1593,14 +1604,6 @@
         Mutexed<Output>::Locked output(mOutput);
         output->buffers.reset();
     }
-    if (mOutputSurface.lock()->surface) {
-        C2BlockPool::local_id_t outputPoolId;
-        {
-            Mutexed<BlockPools>::Locked pools(mBlockPools);
-            outputPoolId = pools->outputPoolId;
-        }
-        mComponent->stopUsingOutputSurface(outputPoolId);
-    }
 }
 
 void CCodecBufferChannel::release() {
diff --git a/media/codec2/sfplugin/CCodecBufferChannel.h b/media/codec2/sfplugin/CCodecBufferChannel.h
index f29a225..61fb06f 100644
--- a/media/codec2/sfplugin/CCodecBufferChannel.h
+++ b/media/codec2/sfplugin/CCodecBufferChannel.h
@@ -149,6 +149,12 @@
             std::map<size_t, sp<MediaCodecBuffer>> &&clientInputBuffers);
 
     /**
+     * Stop using buffers of the current output surface for other Codec
+     * instances to use the surface safely.
+     */
+    void stopUseOutputSurface();
+
+    /**
      * Stop queueing buffers to the component. This object should never queue
      * buffers after this call, until start() is called.
      */
diff --git a/media/libaudioclient/AudioEffect.cpp b/media/libaudioclient/AudioEffect.cpp
index 641c4d9..2870c4c 100644
--- a/media/libaudioclient/AudioEffect.cpp
+++ b/media/libaudioclient/AudioEffect.cpp
@@ -568,7 +568,6 @@
     if (cb != nullptr) {
         cb->onError(mStatus);
     }
-    mIEffect.clear();
 }
 
 // -------------------------------------------------------------------------
diff --git a/media/libaudiohal/impl/EffectsFactoryHalHidl.cpp b/media/libaudiohal/impl/EffectsFactoryHalHidl.cpp
index d7217fc..3470380 100644
--- a/media/libaudiohal/impl/EffectsFactoryHalHidl.cpp
+++ b/media/libaudiohal/impl/EffectsFactoryHalHidl.cpp
@@ -17,6 +17,9 @@
 #define LOG_TAG "EffectsFactoryHalHidl"
 //#define LOG_NDEBUG 0
 
+#include <optional>
+#include <tuple>
+
 #include <cutils/native_handle.h>
 
 #include <UuidUtils.h>
@@ -38,51 +41,71 @@
 using namespace ::android::hardware::audio::common::CPP_VERSION;
 using namespace ::android::hardware::audio::effect::CPP_VERSION;
 
+class EffectDescriptorCache {
+  public:
+    using QueryResult = std::tuple<Return<void>, Result, hidl_vec<EffectDescriptor>>;
+    QueryResult queryAllDescriptors(IEffectsFactory* effectsFactory);
+  private:
+    std::mutex mLock;
+    std::optional<hidl_vec<EffectDescriptor>> mLastDescriptors;  // GUARDED_BY(mLock)
+};
+
+EffectDescriptorCache::QueryResult EffectDescriptorCache::queryAllDescriptors(
+        IEffectsFactory* effectsFactory) {
+    {
+        std::lock_guard l(mLock);
+        if (mLastDescriptors.has_value()) {
+            return {::android::hardware::Void(), Result::OK, mLastDescriptors.value()};
+        }
+    }
+    Result retval = Result::NOT_INITIALIZED;
+    hidl_vec<EffectDescriptor> descriptors;
+    Return<void> ret = effectsFactory->getAllDescriptors(
+            [&](Result r, const hidl_vec<EffectDescriptor>& result) {
+                retval = r;
+                if (retval == Result::OK) {
+                    descriptors = result;
+                }
+            });
+    if (ret.isOk() && retval == Result::OK) {
+        std::lock_guard l(mLock);
+        mLastDescriptors = descriptors;
+    }
+    return {std::move(ret), retval, std::move(descriptors)};
+}
+
 EffectsFactoryHalHidl::EffectsFactoryHalHidl(sp<IEffectsFactory> effectsFactory)
-        : EffectConversionHelperHidl("EffectsFactory") {
+        : EffectConversionHelperHidl("EffectsFactory"), mCache(new EffectDescriptorCache) {
     ALOG_ASSERT(effectsFactory != nullptr, "Provided IEffectsFactory service is NULL");
     mEffectsFactory = effectsFactory;
 }
 
-status_t EffectsFactoryHalHidl::queryAllDescriptors() {
-    if (mEffectsFactory == 0) return NO_INIT;
-    Result retval = Result::NOT_INITIALIZED;
-    Return<void> ret = mEffectsFactory->getAllDescriptors(
-            [&](Result r, const hidl_vec<EffectDescriptor>& result) {
-                retval = r;
-                if (retval == Result::OK) {
-                    mLastDescriptors = result;
-                }
-            });
-    if (ret.isOk()) {
-        return retval == Result::OK ? OK : NO_INIT;
-    }
-    mLastDescriptors.resize(0);
-    return processReturn(__FUNCTION__, ret);
-}
-
 status_t EffectsFactoryHalHidl::queryNumberEffects(uint32_t *pNumEffects) {
-    status_t queryResult = queryAllDescriptors();
-    if (queryResult == OK) {
-        *pNumEffects = mLastDescriptors.size();
+    if (mEffectsFactory == 0) return NO_INIT;
+    auto [ret, retval, descriptors] = mCache->queryAllDescriptors(mEffectsFactory.get());
+    if (ret.isOk() && retval == Result::OK) {
+        *pNumEffects = descriptors.size();
+        return OK;
+    } else if (ret.isOk()) {
+        return NO_INIT;
     }
-    return queryResult;
+    return processReturn(__FUNCTION__, ret);
 }
 
 status_t EffectsFactoryHalHidl::getDescriptor(
         uint32_t index, effect_descriptor_t *pDescriptor) {
-    // TODO: We need somehow to track the changes on the server side
-    // or figure out how to convert everybody to query all the descriptors at once.
     if (pDescriptor == nullptr) {
         return BAD_VALUE;
     }
-    if (mLastDescriptors.size() == 0) {
-        status_t queryResult = queryAllDescriptors();
-        if (queryResult != OK) return queryResult;
+    if (mEffectsFactory == 0) return NO_INIT;
+    auto [ret, retval, descriptors] = mCache->queryAllDescriptors(mEffectsFactory.get());
+    if (ret.isOk() && retval == Result::OK) {
+        if (index >= descriptors.size()) return NAME_NOT_FOUND;
+        EffectUtils::effectDescriptorToHal(descriptors[index], pDescriptor);
+    } else if (ret.isOk()) {
+        return NO_INIT;
     }
-    if (index >= mLastDescriptors.size()) return NAME_NOT_FOUND;
-    EffectUtils::effectDescriptorToHal(mLastDescriptors[index], pDescriptor);
-    return OK;
+    return processReturn(__FUNCTION__, ret);
 }
 
 status_t EffectsFactoryHalHidl::getDescriptor(
@@ -114,21 +137,15 @@
     if (pEffectType == nullptr || descriptors == nullptr) {
         return BAD_VALUE;
     }
+    if (mEffectsFactory == 0) return NO_INIT;
 
-    uint32_t numEffects = 0;
-    status_t status = queryNumberEffects(&numEffects);
-    if (status != NO_ERROR) {
-        ALOGW("%s error %d from FactoryHal queryNumberEffects", __func__, status);
-        return status;
+    auto [ret, retval, hidlDescs] = mCache->queryAllDescriptors(mEffectsFactory.get());
+    if (!ret.isOk() || retval != Result::OK) {
+        return processReturn(__FUNCTION__, ret, retval);
     }
-
-    for (uint32_t i = 0; i < numEffects; i++) {
+    for (const auto& hidlDesc : hidlDescs) {
         effect_descriptor_t descriptor;
-        status = getDescriptor(i, &descriptor);
-        if (status != NO_ERROR) {
-            ALOGW("%s error %d from FactoryHal getDescriptor", __func__, status);
-            continue;
-        }
+        EffectUtils::effectDescriptorToHal(hidlDesc, &descriptor);
         if (memcmp(&descriptor.type, pEffectType, sizeof(effect_uuid_t)) == 0) {
             descriptors->push_back(descriptor);
         }
diff --git a/media/libaudiohal/impl/EffectsFactoryHalHidl.h b/media/libaudiohal/impl/EffectsFactoryHalHidl.h
index e1882e1..7ccddc6 100644
--- a/media/libaudiohal/impl/EffectsFactoryHalHidl.h
+++ b/media/libaudiohal/impl/EffectsFactoryHalHidl.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_HARDWARE_EFFECTS_FACTORY_HAL_HIDL_H
 #define ANDROID_HARDWARE_EFFECTS_FACTORY_HAL_HIDL_H
 
+#include <memory>
+
 #include PATH(android/hardware/audio/effect/FILE_VERSION/IEffectsFactory.h)
 #include <media/audiohal/EffectsFactoryHalInterface.h>
 
@@ -28,6 +30,8 @@
 using ::android::hardware::hidl_vec;
 using namespace ::android::hardware::audio::effect::CPP_VERSION;
 
+class EffectDescriptorCache;
+
 class EffectsFactoryHalHidl : public EffectsFactoryHalInterface, public EffectConversionHelperHidl
 {
   public:
@@ -63,9 +67,7 @@
 
   private:
     sp<IEffectsFactory> mEffectsFactory;
-    hidl_vec<EffectDescriptor> mLastDescriptors;
-
-    status_t queryAllDescriptors();
+    std::unique_ptr<EffectDescriptorCache> mCache;
 };
 
 } // namespace effect
diff --git a/media/libheadtracking/HeadTrackingProcessor.cpp b/media/libheadtracking/HeadTrackingProcessor.cpp
index fb44567..ccb75af 100644
--- a/media/libheadtracking/HeadTrackingProcessor.cpp
+++ b/media/libheadtracking/HeadTrackingProcessor.cpp
@@ -88,10 +88,12 @@
     }
 
     void calculate(int64_t timestamp) override {
-        // Handle the screen first, since it might trigger a recentering of the head.
+        bool screenStable = true;
+
+        // Handle the screen first, since it might: trigger a recentering of the head.
         if (mWorldToScreenTimestamp.has_value()) {
             const Pose3f worldToLogicalScreen = mScreenPoseBias.getOutput();
-            bool screenStable = mScreenStillnessDetector.calculate(timestamp);
+            screenStable = mScreenStillnessDetector.calculate(timestamp);
             mModeSelector.setScreenStable(mWorldToScreenTimestamp.value(), screenStable);
             // Whenever the screen is unstable, recenter the head pose.
             if (!screenStable) {
@@ -105,7 +107,8 @@
         if (mWorldToHeadTimestamp.has_value()) {
             Pose3f worldToHead = mHeadPoseBias.getOutput();
             // Auto-recenter.
-            if (mHeadStillnessDetector.calculate(timestamp)) {
+            bool headStable = mHeadStillnessDetector.calculate(timestamp);
+            if (headStable || !screenStable) {
                 recenter(true, false);
                 worldToHead = mHeadPoseBias.getOutput();
             }
diff --git a/media/libheadtracking/StillnessDetector.cpp b/media/libheadtracking/StillnessDetector.cpp
index be7c893..5232084 100644
--- a/media/libheadtracking/StillnessDetector.cpp
+++ b/media/libheadtracking/StillnessDetector.cpp
@@ -26,6 +26,9 @@
     mFifo.clear();
     mWindowFull = false;
     mSuppressionDeadline.reset();
+    // A "true" state indicates stillness is detected (default = true)
+    mCurrentState = true;
+    mPreviousState = true;
 }
 
 void StillnessDetector::setInput(int64_t timestamp, const Pose3f& input) {
@@ -33,7 +36,15 @@
     discardOld(timestamp);
 }
 
+bool StillnessDetector::getPreviousState() const {
+    return mPreviousState;
+}
+
 bool StillnessDetector::calculate(int64_t timestamp) {
+    // Move the current stillness state to the previous state.
+    // This allows us to detect transitions into and out of stillness.
+    mPreviousState = mCurrentState;
+
     discardOld(timestamp);
 
     // Check whether all the poses in the queue are in the proximity of the new one. We want to do
@@ -60,15 +71,17 @@
 
     // If the window has not been full, return the default value.
     if (!mWindowFull) {
-        return mOptions.defaultValue;
+        mCurrentState = mOptions.defaultValue;
     }
-
     // Force "in motion" while the suppression deadline is active.
-    if (mSuppressionDeadline.has_value()) {
-        return false;
+    else if (mSuppressionDeadline.has_value()) {
+        mCurrentState = false;
+    }
+    else {
+        mCurrentState = !moved;
     }
 
-    return !moved;
+    return mCurrentState;
 }
 
 void StillnessDetector::discardOld(int64_t timestamp) {
diff --git a/media/libheadtracking/StillnessDetector.h b/media/libheadtracking/StillnessDetector.h
index ee4b2d8..abd7cc4 100644
--- a/media/libheadtracking/StillnessDetector.h
+++ b/media/libheadtracking/StillnessDetector.h
@@ -80,7 +80,8 @@
     void setInput(int64_t timestamp, const Pose3f& input);
     /** Calculate whether the stream is still at the given timestamp. */
     bool calculate(int64_t timestamp);
-
+    /** Return the stillness state from the previous call to calculate() */
+    bool getPreviousState() const;
   private:
     struct TimestampedPose {
         int64_t timestamp;
@@ -92,6 +93,8 @@
     const float mCosHalfRotationalThreshold;
     std::deque<TimestampedPose> mFifo;
     bool mWindowFull = false;
+    bool mCurrentState = true;
+    bool mPreviousState = true;
     // As soon as motion is detected, this will be set for the time of detection + window duration,
     // and during this time we will always consider outselves in motion without checking. This is
     // used for hyteresis purposes, since because of the approximate method we use for determining
diff --git a/media/libmediametrics/include/MediaMetricsConstants.h b/media/libmediametrics/include/MediaMetricsConstants.h
index 1c30510..bebd382 100644
--- a/media/libmediametrics/include/MediaMetricsConstants.h
+++ b/media/libmediametrics/include/MediaMetricsConstants.h
@@ -57,6 +57,10 @@
 // The Audio Spatializer key appends the spatializerId (currently 0)
 #define AMEDIAMETRICS_KEY_PREFIX_AUDIO_SPATIALIZER AMEDIAMETRICS_KEY_PREFIX_AUDIO "spatializer."
 
+// The Audio Spatializer device key appends the device type.
+#define AMEDIAMETRICS_KEY_PREFIX_AUDIO_SPATIALIZER_DEVICE \
+        AMEDIAMETRICS_KEY_PREFIX_AUDIO_SPATIALIZER "device."
+
 // The AudioStream key appends the "streamId" to the prefix.
 #define AMEDIAMETRICS_KEY_PREFIX_AUDIO_STREAM  AMEDIAMETRICS_KEY_PREFIX_AUDIO "stream."
 
@@ -107,6 +111,7 @@
 // of suppressed in the Time Machine.
 #define AMEDIAMETRICS_PROP_SUFFIX_CHAR_DUPLICATES_ALLOWED '#'
 
+#define AMEDIAMETRICS_PROP_ADDRESS        "address"        // string, for example MAC address
 #define AMEDIAMETRICS_PROP_ALLOWUID       "_allowUid"      // int32_t, allow client uid to post
 #define AMEDIAMETRICS_PROP_AUDIOMODE      "audioMode"      // string (audio.flinger)
 #define AMEDIAMETRICS_PROP_AUXEFFECTID    "auxEffectId"    // int32 (AudioTrack)
@@ -116,6 +121,8 @@
 #define AMEDIAMETRICS_PROP_CALLERNAME     "callerName"     // string, eg. "aaudio"
 #define AMEDIAMETRICS_PROP_CHANNELCOUNT   "channelCount"   // int32
 #define AMEDIAMETRICS_PROP_CHANNELMASK    "channelMask"    // int32
+#define AMEDIAMETRICS_PROP_CHANNELMASKS   "channelMasks"   // string with channelMask values
+                                                           // separated by |.
 #define AMEDIAMETRICS_PROP_CONTENTTYPE    "contentType"    // string attributes (AudioTrack)
 #define AMEDIAMETRICS_PROP_CUMULATIVETIMENS "cumulativeTimeNs" // int64_t playback/record time
                                                            // since start
@@ -132,6 +139,7 @@
 
 #define AMEDIAMETRICS_PROP_DIRECTION      "direction"      // string AAudio input or output
 #define AMEDIAMETRICS_PROP_DURATIONNS     "durationNs"     // int64 duration time span
+#define AMEDIAMETRICS_PROP_ENABLED        "enabled"        // string true/false.
 #define AMEDIAMETRICS_PROP_ENCODING       "encoding"       // string value of format
 
 #define AMEDIAMETRICS_PROP_EVENT          "event#"         // string value (often func name)
@@ -141,6 +149,8 @@
 #define AMEDIAMETRICS_PROP_FLAGS          "flags"
 
 #define AMEDIAMETRICS_PROP_FRAMECOUNT     "frameCount"     // int32
+#define AMEDIAMETRICS_PROP_HASHEADTRACKER  "hasHeadTracker" // string true/false
+#define AMEDIAMETRICS_PROP_HEADTRACKERENABLED "headTrackerEnabled" // string true/false
 #define AMEDIAMETRICS_PROP_HEADTRACKINGMODES "headTrackingModes" // string |, like modes.
 #define AMEDIAMETRICS_PROP_INPUTDEVICES   "inputDevices"   // string value
 #define AMEDIAMETRICS_PROP_INTERNALTRACKID "internalTrackId" // int32
diff --git a/media/libmediaplayerservice/StagefrightRecorder.cpp b/media/libmediaplayerservice/StagefrightRecorder.cpp
index ea1fdf4..a0bc8ca 100644
--- a/media/libmediaplayerservice/StagefrightRecorder.cpp
+++ b/media/libmediaplayerservice/StagefrightRecorder.cpp
@@ -1966,6 +1966,10 @@
             format->setString("mime", MEDIA_MIMETYPE_VIDEO_HEVC);
             break;
 
+        case VIDEO_ENCODER_DOLBY_VISION:
+            format->setString("mime", MEDIA_MIMETYPE_VIDEO_DOLBY_VISION);
+            break;
+
         default:
             CHECK(!"Should not be here, unsupported video encoding.");
             break;
diff --git a/media/libmediaplayerservice/nuplayer/AWakeLock.cpp b/media/libmediaplayerservice/nuplayer/AWakeLock.cpp
index c3bd207..25a8ae4 100644
--- a/media/libmediaplayerservice/nuplayer/AWakeLock.cpp
+++ b/media/libmediaplayerservice/nuplayer/AWakeLock.cpp
@@ -59,11 +59,10 @@
         if (mPowerManager != NULL) {
             sp<IBinder> binder = new BBinder();
             int64_t token = IPCThreadState::self()->clearCallingIdentity();
-            binder::Status status = mPowerManager->acquireWakeLock(
+            binder::Status status = mPowerManager->acquireWakeLockAsync(
                     binder, POWERMANAGER_PARTIAL_WAKE_LOCK,
                     String16("AWakeLock"), String16("media"),
-                    {} /* workSource */, {} /* historyTag */, -1 /* displayId */,
-                    nullptr /* callback */);
+                    {} /* workSource */, {} /* historyTag */);
             IPCThreadState::self()->restoreCallingIdentity(token);
             if (status.isOk()) {
                 mWakeLockToken = binder;
diff --git a/media/libstagefright/HevcUtils.cpp b/media/libstagefright/HevcUtils.cpp
index 5f9c20e..60df162 100644
--- a/media/libstagefright/HevcUtils.cpp
+++ b/media/libstagefright/HevcUtils.cpp
@@ -102,10 +102,11 @@
 static bool findParam(uint32_t key, T *param,
         KeyedVector<uint32_t, uint64_t> &params) {
     CHECK(param);
-    if (params.indexOfKey(key) < 0) {
+    ssize_t index = params.indexOfKey(key);
+    if (index < 0) {
         return false;
     }
-    *param = (T) params[key];
+    *param = (T) params[index];
     return true;
 }
 
diff --git a/media/libstagefright/MediaCodec.cpp b/media/libstagefright/MediaCodec.cpp
index e50880a..c963e19 100644
--- a/media/libstagefright/MediaCodec.cpp
+++ b/media/libstagefright/MediaCodec.cpp
@@ -3534,6 +3534,17 @@
                     }
                     setState(STARTED);
                     postPendingRepliesAndDeferredMessages("kWhatStartCompleted");
+
+                    // Now that the codec has started, configure, by default, the peek behavior to
+                    // be undefined for backwards compatibility with older releases. Later, if an
+                    // app explicitly enables or disables peek, the parameter will be turned off and
+                    // the legacy undefined behavior is disallowed.
+                    // See updateTunnelPeek called in onSetParameters for more details.
+                    if (mTunneled && mTunnelPeekState == TunnelPeekState::kLegacyMode) {
+                        sp<AMessage> params = new AMessage;
+                        params->setInt32("android._tunnel-peek-set-legacy", 1);
+                        mCodec->signalSetParameters(params);
+                    }
                     break;
                 }
 
@@ -3973,14 +3984,6 @@
                 mTunneled = false;
             }
 
-            // If mTunnelPeekState is still in kLegacyMode at this point,
-            // configure the codec in legacy mode
-            if (mTunneled && (mTunnelPeekState == TunnelPeekState::kLegacyMode)) {
-                sp<AMessage> params = new AMessage;
-                params->setInt32("android._tunnel-peek-set-legacy", 1);
-                onSetParameters(params);
-            }
-
             int32_t background = 0;
             if (format->findInt32("android._background-mode", &background) && background) {
                 androidSetThreadPriority(gettid(), ANDROID_PRIORITY_BACKGROUND);
diff --git a/media/ndk/NdkMediaCodec.cpp b/media/ndk/NdkMediaCodec.cpp
index 38e422d..ed31c02 100644
--- a/media/ndk/NdkMediaCodec.cpp
+++ b/media/ndk/NdkMediaCodec.cpp
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <charconv>
 #include <inttypes.h>
 #include <mutex>
 #include <set>
@@ -324,29 +325,61 @@
             }
 
             AMessage::Type type;
-            int64_t mediaTimeUs, systemNano;
-            size_t index = 0;
+            size_t n = data->countEntries();
 
-            // TODO. This code has dependency with MediaCodec::CreateFramesRenderedMessage.
-            for (size_t ix = 0; ix < data->countEntries(); ix++) {
-                AString name = data->getEntryNameAt(ix, &type);
-                if (name.startsWith(AStringPrintf("%zu-media-time-us", index).c_str())) {
-                    AMessage::ItemData data = msg->getEntryAt(index);
-                    data.find(&mediaTimeUs);
-                } else if (name.startsWith(AStringPrintf("%zu-system-nano", index).c_str())) {
-                    AMessage::ItemData data = msg->getEntryAt(index);
-                    data.find(&systemNano);
+            thread_local std::vector<std::optional<int64_t>> mediaTimesInUs;
+            thread_local std::vector<std::optional<int64_t>> systemTimesInNs;
+            mediaTimesInUs.resize(n);
+            systemTimesInNs.resize(n);
+            std::fill_n(mediaTimesInUs.begin(), n, std::nullopt);
+            std::fill_n(systemTimesInNs.begin(), n, std::nullopt);
+            for (size_t i = 0; i < n; i++) {
+                AString name = data->getEntryNameAt(i, &type);
+                if (name.endsWith("-media-time-us")) {
+                    int64_t mediaTimeUs;
+                    AMessage::ItemData itemData = data->getEntryAt(i);
+                    itemData.find(&mediaTimeUs);
 
-                    Mutex::Autolock _l(mCodec->mFrameRenderedCallbackLock);
-                    if (mCodec->mFrameRenderedCallback != NULL) {
+                    int index = -1;
+                    std::from_chars_result result = std::from_chars(
+                            name.c_str(), name.c_str() + name.find("-"), index);
+                    if (result.ec == std::errc() && 0 <= index && index < n) {
+                        mediaTimesInUs[index] = mediaTimeUs;
+                    } else {
+                        std::error_code ec = std::make_error_code(result.ec);
+                        ALOGE("Unexpected media time index: #%d with value %lldus (err=%d %s)",
+                              index, (long long)mediaTimeUs, ec.value(), ec.message().c_str());
+                    }
+                } else if (name.endsWith("-system-nano")) {
+                    int64_t systemNano;
+                    AMessage::ItemData itemData = data->getEntryAt(i);
+                    itemData.find(&systemNano);
+
+                    int index = -1;
+                    std::from_chars_result result = std::from_chars(
+                            name.c_str(), name.c_str() + name.find("-"), index);
+                    if (result.ec == std::errc() && 0 <= index && index < n) {
+                        systemTimesInNs[index] = systemNano;
+                    } else {
+                        std::error_code ec = std::make_error_code(result.ec);
+                        ALOGE("Unexpected system time index: #%d with value %lldns (err=%d %s)",
+                              index, (long long)systemNano, ec.value(), ec.message().c_str());
+                    }
+                }
+            }
+
+            Mutex::Autolock _l(mCodec->mFrameRenderedCallbackLock);
+            if (mCodec->mFrameRenderedCallback != NULL) {
+                for (size_t i = 0; i < n; ++i) {
+                    if (mediaTimesInUs[i] && systemTimesInNs[i]) {
                         mCodec->mFrameRenderedCallback(
                                 mCodec,
                                 mCodec->mFrameRenderedCallbackUserData,
-                                mediaTimeUs,
-                                systemNano);
+                                mediaTimesInUs[i].value(),
+                                systemTimesInNs[i].value());
+                    } else {
+                        break;
                     }
-
-                    index++;
                 }
             }
             break;
@@ -529,22 +562,31 @@
         AMediaCodecOnAsyncNotifyCallback callback,
         void *userdata) {
 
-    Mutex::Autolock _l(mData->mAsyncCallbackLock);
-
-    if (mData->mAsyncNotify == NULL) {
-        mData->mAsyncNotify = new AMessage(kWhatAsyncNotify, mData->mHandler);
+    {
+        Mutex::Autolock _l(mData->mAsyncCallbackLock);
+        if (mData->mAsyncNotify == NULL) {
+            mData->mAsyncNotify = new AMessage(kWhatAsyncNotify, mData->mHandler);
+        }
+        // we set this ahead so that we can be ready
+        // to receive callbacks as soon as the next call is a
+        // success.
+        mData->mAsyncCallback = callback;
+        mData->mAsyncCallbackUserData = userdata;
     }
 
     // always call, codec may have been reset/re-configured since last call.
     status_t err = mData->mCodec->setCallback(mData->mAsyncNotify);
     if (err != OK) {
+        {
+            //The setup gone wrong. clean up the pointers.
+            Mutex::Autolock _l(mData->mAsyncCallbackLock);
+            mData->mAsyncCallback = {};
+            mData->mAsyncCallbackUserData = nullptr;
+        }
         ALOGE("setAsyncNotifyCallback: err(%d), failed to set async callback", err);
         return translate_error(err);
     }
 
-    mData->mAsyncCallback = callback;
-    mData->mAsyncCallbackUserData = userdata;
-
     return AMEDIA_OK;
 }
 
diff --git a/media/utils/MethodStatistics.cpp b/media/utils/MethodStatistics.cpp
index b179b20..086757b 100644
--- a/media/utils/MethodStatistics.cpp
+++ b/media/utils/MethodStatistics.cpp
@@ -22,7 +22,8 @@
 
 std::shared_ptr<std::vector<std::string>>
 getStatisticsClassesForModule(std::string_view moduleName) {
-    static const std::map<std::string, std::shared_ptr<std::vector<std::string>>> m {
+    static const std::map<std::string, std::shared_ptr<std::vector<std::string>>,
+            std::less<> /* transparent comparator */> m {
         {
             METHOD_STATISTICS_MODULE_NAME_AUDIO_HIDL,
             std::shared_ptr<std::vector<std::string>>(
@@ -34,13 +35,14 @@
               })
         },
     };
-    auto it = m.find({moduleName.begin(), moduleName.end()});
+    auto it = m.find(moduleName);
     if (it == m.end()) return {};
     return it->second;
 }
 
 static void addClassesToMap(const std::shared_ptr<std::vector<std::string>> &classNames,
-        std::map<std::string, std::shared_ptr<MethodStatistics<std::string>>> &map) {
+        std::map<std::string, std::shared_ptr<MethodStatistics<std::string>>,
+                std::less<> /* transparent comparator */> &map) {
     if (classNames) {
         for (const auto& className : *classNames) {
             map.emplace(className, std::make_shared<MethodStatistics<std::string>>());
@@ -51,17 +53,18 @@
 // singleton statistics for DeviceHalHidl StreamOutHalHidl StreamInHalHidl
 std::shared_ptr<MethodStatistics<std::string>>
 getStatisticsForClass(std::string_view className) {
-    static const std::map<std::string, std::shared_ptr<MethodStatistics<std::string>>> m =
+    static const std::map<std::string, std::shared_ptr<MethodStatistics<std::string>>,
+            std::less<> /* transparent comparator */> m =
         // copy elided initialization of map m.
         [](){
-            std::map<std::string, std::shared_ptr<MethodStatistics<std::string>>> m;
+            std::map<std::string, std::shared_ptr<MethodStatistics<std::string>>, std::less<>> m;
             addClassesToMap(
                     getStatisticsClassesForModule(METHOD_STATISTICS_MODULE_NAME_AUDIO_HIDL),
                     m);
             return m;
         }();
 
-    auto it = m.find({className.begin(), className.end()});
+    auto it = m.find(className);
     if (it == m.end()) return {};
     return it->second;
 }
diff --git a/media/utils/TimeCheck.cpp b/media/utils/TimeCheck.cpp
index 0848eb3..e53d70f 100644
--- a/media/utils/TimeCheck.cpp
+++ b/media/utils/TimeCheck.cpp
@@ -21,6 +21,7 @@
 #include <android-base/logging.h>
 #include <audio_utils/clock.h>
 #include <mediautils/EventLog.h>
+#include <mediautils/FixedString.h>
 #include <mediautils/MethodStatistics.h>
 #include <mediautils/TimeCheck.h>
 #include <utils/Log.h>
@@ -138,11 +139,11 @@
     return getTimeCheckThread().toString();
 }
 
-TimeCheck::TimeCheck(std::string tag, OnTimerFunc&& onTimer, uint32_t timeoutMs,
+TimeCheck::TimeCheck(std::string_view tag, OnTimerFunc&& onTimer, uint32_t timeoutMs,
         bool crashOnTimeout)
-    : mTimeCheckHandler(new TimeCheckHandler{
-            std::move(tag), std::move(onTimer), crashOnTimeout,
-            std::chrono::system_clock::now(), gettid()})
+    : mTimeCheckHandler{ std::make_shared<TimeCheckHandler>(
+            tag, std::move(onTimer), crashOnTimeout,
+            std::chrono::system_clock::now(), gettid()) }
     , mTimerHandle(timeoutMs == 0
               ? getTimeCheckThread().trackTask(mTimeCheckHandler->tag)
               : getTimeCheckThread().scheduleTask(
@@ -231,14 +232,14 @@
             mediautils::getStatisticsForClass(className);
     if (!statistics) return {}; // empty TimeCheck.
     return mediautils::TimeCheck(
-            std::string(className).append("::").append(methodName),
-            [ clazz = std::string(className), method = std::string(methodName),
+            FixedString62(className).append("::").append(methodName),
+            [ safeMethodName = FixedString30(methodName),
               stats = std::move(statistics) ]
             (bool timeout, float elapsedMs) {
                     if (timeout) {
                         ; // ignored, there is no timeout value.
                     } else {
-                        stats->event(method, elapsedMs);
+                        stats->event(safeMethodName.asStringView(), elapsedMs);
                     }
             }, 0 /* timeoutMs */);
 }
diff --git a/media/utils/TimerThread.cpp b/media/utils/TimerThread.cpp
index 6de6b13..09783ed 100644
--- a/media/utils/TimerThread.cpp
+++ b/media/utils/TimerThread.cpp
@@ -31,17 +31,15 @@
 extern std::string_view timeSuffix(std::string_view time1, std::string_view time2);
 
 TimerThread::Handle TimerThread::scheduleTask(
-        std::string tag, std::function<void()>&& func, std::chrono::milliseconds timeout) {
+        std::string_view tag, std::function<void()>&& func, std::chrono::milliseconds timeout) {
     const auto now = std::chrono::system_clock::now();
-    std::shared_ptr<const Request> request{
-            new Request{ now, now + timeout, gettid(), std::move(tag) }};
+    auto request = std::make_shared<const Request>(now, now + timeout, gettid(), tag);
     return mMonitorThread.add(std::move(request), std::move(func), timeout);
 }
 
-TimerThread::Handle TimerThread::trackTask(std::string tag) {
+TimerThread::Handle TimerThread::trackTask(std::string_view tag) {
     const auto now = std::chrono::system_clock::now();
-    std::shared_ptr<const Request> request{
-            new Request{ now, now, gettid(), std::move(tag) }};
+    auto request = std::make_shared<const Request>(now, now, gettid(), tag);
     return mNoTimeoutMap.add(std::move(request));
 }
 
@@ -106,10 +104,10 @@
 //
 /* static */
 bool TimerThread::isRequestFromHal(const std::shared_ptr<const Request>& request) {
-    const size_t hidlPos = request->tag.find("Hidl");
+    const size_t hidlPos = request->tag.asStringView().find("Hidl");
     if (hidlPos == std::string::npos) return false;
     // should be a separator afterwards Hidl which indicates the string was in the class.
-    const size_t separatorPos = request->tag.find("::", hidlPos);
+    const size_t separatorPos = request->tag.asStringView().find("::", hidlPos);
     return separatorPos != std::string::npos;
 }
 
diff --git a/media/utils/include/mediautils/FixedString.h b/media/utils/include/mediautils/FixedString.h
new file mode 100644
index 0000000..047aa82
--- /dev/null
+++ b/media/utils/include/mediautils/FixedString.h
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <algorithm>
+#include <string>
+#include <string_view>
+
+namespace android::mediautils {
+
+/*
+ * FixedString is a stack allocatable string buffer that supports
+ * simple appending of other strings and string_views.
+ *
+ * It is designed for no-malloc operation when std::string
+ * small buffer optimization is insufficient.
+ *
+ * To keep code small, use asStringView() for operations on this.
+ *
+ * Notes:
+ * 1) Appending beyond the internal buffer size results in truncation.
+ *
+ * Alternatives:
+ * 1) If you want a sharable copy-on-write string implementation,
+ *    consider using the legacy android::String8().
+ * 2) Using std::string with a fixed stack allocator may suit your needs,
+ *    but exception avoidance is tricky.
+ * 3) Using C++20 ranges https://en.cppreference.com/w/cpp/ranges if you don't
+ *    need backing store.  Be careful about allocation with ranges.
+ *
+ * Good small sizes are multiples of 16 minus 2, e.g. 14, 30, 46, 62.
+ *
+ * Implementation Notes:
+ * 1) No iterators or [] for FixedString - please convert to std::string_view.
+ * 2) For small N (e.g. less than 62), consider a change to always zero fill and
+ *    potentially prevent always zero terminating (if one only does append).
+ *
+ * Possible arguments to create/append:
+ * 1) A FixedString.
+ * 2) A single char.
+ * 3) A char * pointer.
+ * 4) A std::string.
+ * 5) A std::string_view (or something convertible to it).
+ *
+ * Example:
+ *
+ * FixedString s1(std::string("a"));    // ctor
+ * s1 << "bc" << 'd' << '\n';           // streaming append
+ * s1 += "hello";                       // += append
+ * ASSERT_EQ(s1, "abcd\nhello");
+ */
+template <uint32_t N>
+struct FixedString
+{
+    // Find the best size type.
+    using strsize_t = std::conditional_t<(N > 255), uint32_t, uint8_t>;
+
+    // constructors
+    FixedString() { // override default
+        buffer_[0] = '\0';
+    }
+
+    FixedString(const FixedString& other) { // override default.
+        copyFrom<N>(other);
+    }
+
+    // The following constructor is not explicit to allow
+    // FixedString<8> s = "abcd";
+    template <typename ...Types>
+    FixedString(Types&&... args) {
+        append(std::forward<Types>(args)...);
+    }
+
+    // copy assign (copyFrom checks for equality and returns *this).
+    FixedString& operator=(const FixedString& other) { // override default.
+        return copyFrom<N>(other);
+    }
+
+    template <typename ...Types>
+    FixedString& operator=(Types&&... args) {
+        size_ = 0;
+        return append(std::forward<Types>(args)...);
+    }
+
+    // operator equals
+    bool operator==(const char *s) const {
+        return strncmp(c_str(), s, capacity() + 1) == 0;
+    }
+
+    bool operator==(std::string_view s) const {
+        return size() == s.size() && memcmp(data(), s.data(), size()) == 0;
+    }
+
+    // operator not-equals
+    template <typename T>
+    bool operator!=(const T& other) const {
+        return !operator==(other);
+    }
+
+    // operator +=
+    template <typename ...Types>
+    FixedString& operator+=(Types&&... args) {
+        return append(std::forward<Types>(args)...);
+    }
+
+    // conversion to std::string_view.
+    operator std::string_view() const {
+        return asStringView();
+    }
+
+    // basic observers
+    size_t buffer_offset() const { return offsetof(std::decay_t<decltype(*this)>, buffer_); }
+    static constexpr uint32_t capacity() { return N; }
+    uint32_t size() const { return size_; }
+    uint32_t remaining() const { return size_ >= N ? 0 : N - size_; }
+    bool empty() const { return size_ == 0; }
+    bool full() const { return size_ == N; }  // when full, possible truncation risk.
+    char * data() { return buffer_; }
+    const char * data() const { return buffer_; }
+    const char * c_str() const { return buffer_; }
+
+    inline std::string_view asStringView() const {
+        return { buffer_, static_cast<size_t>(size_) };
+    }
+    inline std::string asString() const {
+        return { buffer_, static_cast<size_t>(size_) };
+    }
+
+    void clear() { size_ = 0; buffer_[0] = 0; }
+
+    // Implementation of append - using templates
+    // to guarantee precedence in the presence of ambiguity.
+    //
+    // Consider C++20 template overloading through constraints and concepts.
+    template <typename T>
+    FixedString& append(const T& t) {
+        using decayT = std::decay_t<T>;
+        if constexpr (is_specialization_v<decayT, FixedString>) {
+            // A FixedString<U>
+            if (size_ == 0) {
+                // optimization to erase everything.
+                return copyFrom(t);
+            } else {
+                return appendStringView({t.data(), t.size()});
+            }
+        } else if constexpr(std::is_same_v<decayT, char>) {
+            if (size_ < N) {
+                buffer_[size_++] = t;
+                buffer_[size_] = '\0';
+            }
+            return *this;
+        } else if constexpr(std::is_same_v<decayT, char *>) {
+            // Some char* ptr.
+            return appendString(t);
+        } else if constexpr (std::is_convertible_v<decayT, std::string_view>) {
+            // std::string_view, std::string, or some other convertible type.
+            return appendStringView(t);
+        } else /* constexpr */ {
+            static_assert(dependent_false_v<T>, "non-matching append type");
+        }
+    }
+
+    FixedString& appendStringView(std::string_view s) {
+        uint32_t total = std::min(static_cast<size_t>(N - size_), s.size());
+        memcpy(buffer_ + size_, s.data(), total);
+        size_ += total;
+        buffer_[size_] = '\0';
+        return *this;
+    }
+
+    FixedString& appendString(const char *s) {
+        // strncpy zero pads to the end,
+        // strlcpy returns total expected length,
+        // we don't have strncpy_s in Bionic,
+        // so we write our own here.
+        while (size_ < N && *s != '\0') {
+            buffer_[size_++] = *s++;
+        }
+        buffer_[size_] = '\0';
+        return *this;
+    }
+
+    // Copy initialize the struct.
+    // Note: We are POD but customize the copying for acceleration
+    // of moving small strings embedded in a large buffers.
+    template <uint32_t U>
+    FixedString& copyFrom(const FixedString<U>& other) {
+        if ((void*)this != (void*)&other) { // not a self-assignment
+            if (other.size() == 0) {
+                size_ = 0;
+                buffer_[0] = '\0';
+                return *this;
+            }
+            constexpr size_t kSizeToCopyWhole = 64;
+            if constexpr (N == U &&
+                    sizeof(*this) == sizeof(other) &&
+                    sizeof(*this) <= kSizeToCopyWhole) {
+                // As we have the same str size type, we can just
+                // memcpy with fixed size, which can be easily optimized.
+                memcpy(static_cast<void*>(this), static_cast<const void*>(&other), sizeof(*this));
+                return *this;
+            }
+            if constexpr (std::is_same_v<strsize_t, typename FixedString<U>::strsize_t>) {
+                constexpr size_t kAlign = 8;  // align to a multiple of 8.
+                static_assert((kAlign & (kAlign - 1)) == 0); // power of 2.
+                // we check any alignment issues.
+                if (buffer_offset() == other.buffer_offset() && other.size() <= capacity()) {
+                    // improve on standard POD copying by reducing size.
+                    const size_t mincpy = buffer_offset() + other.size() + 1 /* nul */;
+                    const size_t maxcpy = std::min(sizeof(*this), sizeof(other));
+                    const size_t cpysize = std::min(mincpy + kAlign - 1 & ~(kAlign - 1), maxcpy);
+                    memcpy(static_cast<void*>(this), static_cast<const void*>(&other), cpysize);
+                    return *this;
+                }
+            }
+            size_ = std::min(other.size(), capacity());
+            memcpy(buffer_, other.data(), size_);
+            buffer_[size_] = '\0';  // zero terminate.
+        }
+        return *this;
+    }
+
+private:
+    //  Template helper methods
+
+    template <typename Test, template <uint32_t> class Ref>
+    struct is_specialization : std::false_type {};
+
+    template <template <uint32_t> class Ref, uint32_t UU>
+    struct is_specialization<Ref<UU>, Ref>: std::true_type {};
+
+    template <typename Test, template <uint32_t> class Ref>
+    static inline constexpr bool is_specialization_v = is_specialization<Test, Ref>::value;
+
+    // For static assert(false) we need a template version to avoid early failure.
+    template <typename T>
+    static inline constexpr bool dependent_false_v = false;
+
+    // POD variables
+    strsize_t size_ = 0;
+    char buffer_[N + 1 /* allow zero termination */];
+};
+
+// Stream operator syntactic sugar.
+// Example:
+// s << 'b' << "c" << "d" << '\n';
+template <uint32_t N, typename ...Types>
+FixedString<N>& operator<<(FixedString<N>& fs, Types&&... args) {
+    return fs.append(std::forward<Types>(args)...);
+}
+
+// We do not use a default size for fixed string as changing
+// the default size would lead to different behavior - we want the
+// size to be explicitly known.
+
+// FixedString62 of 62 chars fits in one typical cache line.
+using FixedString62 = FixedString<62>;
+
+// Slightly smaller
+using FixedString30 = FixedString<30>;
+
+// Since we have added copy and assignment optimizations,
+// we are no longer trivially assignable and copyable.
+// But we check standard layout here to prevent inclusion of unacceptable members or virtuals.
+static_assert(std::is_standard_layout_v<FixedString62>);
+static_assert(std::is_standard_layout_v<FixedString30>);
+
+}  // namespace android::mediautils
diff --git a/media/utils/include/mediautils/MethodStatistics.h b/media/utils/include/mediautils/MethodStatistics.h
index 700fbaa..6d7e990 100644
--- a/media/utils/include/mediautils/MethodStatistics.h
+++ b/media/utils/include/mediautils/MethodStatistics.h
@@ -55,15 +55,23 @@
     /**
      * Adds a method event, typically execution time in ms.
      */
-    void event(Code code, FloatType executeMs) {
+    template <typename C>
+    void event(C&& code, FloatType executeMs) {
         std::lock_guard lg(mLock);
-        mStatisticsMap[code].add(executeMs);
+        auto it = mStatisticsMap.lower_bound(code);
+        if (it != mStatisticsMap.end() && it->first == code) {
+            it->second.add(executeMs);
+        } else {
+            // StatsType ctor takes an optional array of data for initialization.
+            FloatType dataArray[1] = { executeMs };
+            mStatisticsMap.emplace_hint(it, std::forward<C>(code), dataArray);
+        }
     }
 
     /**
      * Returns the name for the method code.
      */
-    std::string getMethodForCode(Code code) const {
+    std::string getMethodForCode(const Code& code) const {
         auto it = mMethodMap.find(code);
         return it == mMethodMap.end() ? std::to_string((int)code) : it->second;
     }
@@ -71,7 +79,7 @@
     /**
      * Returns the number of times the method was invoked by event().
      */
-    size_t getMethodCount(Code code) const {
+    size_t getMethodCount(const Code& code) const {
         std::lock_guard lg(mLock);
         auto it = mStatisticsMap.find(code);
         return it == mStatisticsMap.end() ? 0 : it->second.getN();
@@ -80,7 +88,7 @@
     /**
      * Returns the statistics object for the method.
      */
-    StatsType getStatistics(Code code) const {
+    StatsType getStatistics(const Code& code) const {
         std::lock_guard lg(mLock);
         auto it = mStatisticsMap.find(code);
         return it == mStatisticsMap.end() ? StatsType{} : it->second;
@@ -107,9 +115,10 @@
     }
 
 private:
-    const std::map<Code, std::string> mMethodMap;
+    // Note: we use a transparent comparator std::less<> for heterogeneous key lookup.
+    const std::map<Code, std::string, std::less<>> mMethodMap;
     mutable std::mutex mLock;
-    std::map<Code, StatsType> mStatisticsMap GUARDED_BY(mLock);
+    std::map<Code, StatsType, std::less<>> mStatisticsMap GUARDED_BY(mLock);
 };
 
 // Managed Statistics support.
diff --git a/media/utils/include/mediautils/TimeCheck.h b/media/utils/include/mediautils/TimeCheck.h
index ef03aef..038e7dd 100644
--- a/media/utils/include/mediautils/TimeCheck.h
+++ b/media/utils/include/mediautils/TimeCheck.h
@@ -60,7 +60,7 @@
      *                  the TimeCheck object is destroyed or leaves scope.
      * \param crashOnTimeout true if the object issues an abort on timeout.
      */
-    explicit TimeCheck(std::string tag, OnTimerFunc&& onTimer = {},
+    explicit TimeCheck(std::string_view tag, OnTimerFunc&& onTimer = {},
             uint32_t timeoutMs = kDefaultTimeOutMs, bool crashOnTimeout = true);
 
     TimeCheck() = default;
@@ -79,7 +79,17 @@
     // The usage here is const safe.
     class TimeCheckHandler {
     public:
-        const std::string tag;
+        template <typename S, typename F>
+        TimeCheckHandler(S&& _tag, F&& _onTimer, bool _crashOnTimeout,
+            const std::chrono::system_clock::time_point& _startTime,
+            pid_t _tid)
+            : tag(std::forward<S>(_tag))
+            , onTimer(std::forward<F>(_onTimer))
+            , crashOnTimeout(_crashOnTimeout)
+            , startTime(_startTime)
+            , tid(_tid)
+            {}
+        const FixedString62 tag;
         const OnTimerFunc onTimer;
         const bool crashOnTimeout;
         const std::chrono::system_clock::time_point startTime;
diff --git a/media/utils/include/mediautils/TimerThread.h b/media/utils/include/mediautils/TimerThread.h
index ffee602..349bffd 100644
--- a/media/utils/include/mediautils/TimerThread.h
+++ b/media/utils/include/mediautils/TimerThread.h
@@ -27,6 +27,8 @@
 
 #include <android-base/thread_annotations.h>
 
+#include <mediautils/FixedString.h>
+
 namespace android::mediautils {
 
 /**
@@ -54,7 +56,7 @@
      * \returns       a handle that can be used for cancellation.
      */
     Handle scheduleTask(
-            std::string tag, std::function<void()>&& func, std::chrono::milliseconds timeout);
+            std::string_view tag, std::function<void()>&& func, std::chrono::milliseconds timeout);
 
     /**
      * Tracks a task that shows up on toString() until cancelled.
@@ -62,7 +64,7 @@
      * \param tag     string associated with the task.
      * \returns       a handle that can be used for cancellation.
      */
-    Handle trackTask(std::string tag);
+    Handle trackTask(std::string_view tag);
 
     /**
      * Cancels a task previously scheduled with scheduleTask()
@@ -129,12 +131,22 @@
     // To minimize movement of data, we pass around shared_ptrs to Requests.
     // These are allocated and deallocated outside of the lock.
     struct Request {
+        Request(const std::chrono::system_clock::time_point& _scheduled,
+                const std::chrono::system_clock::time_point& _deadline,
+                pid_t _tid,
+                std::string_view _tag)
+            : scheduled(_scheduled)
+            , deadline(_deadline)
+            , tid(_tid)
+            , tag(_tag)
+            {}
+
         const std::chrono::system_clock::time_point scheduled;
         const std::chrono::system_clock::time_point deadline; // deadline := scheduled + timeout
                                                               // if deadline == scheduled, no
                                                               // timeout, task not executed.
         const pid_t tid;
-        const std::string tag;
+        const FixedString62 tag;
 
         std::string toString() const;
     };
diff --git a/media/utils/tests/Android.bp b/media/utils/tests/Android.bp
index 1024018..232cc4e 100644
--- a/media/utils/tests/Android.bp
+++ b/media/utils/tests/Android.bp
@@ -124,6 +124,27 @@
 }
 
 cc_test {
+    name: "mediautils_fixedstring_tests",
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wextra",
+    ],
+
+    shared_libs: [
+        "libaudioutils",
+        "liblog",
+        "libmediautils",
+        "libutils",
+    ],
+
+    srcs: [
+        "mediautils_fixedstring_tests.cpp",
+    ],
+}
+
+cc_test {
     name: "mediautils_scopedstatistics_tests",
 
     cflags: [
diff --git a/media/utils/tests/mediautils_fixedstring_tests.cpp b/media/utils/tests/mediautils_fixedstring_tests.cpp
new file mode 100644
index 0000000..7ab9a9f
--- /dev/null
+++ b/media/utils/tests/mediautils_fixedstring_tests.cpp
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "mediautils_fixedstring_tests"
+
+#include <mediautils/FixedString.h>
+
+#include <gtest/gtest.h>
+#include <utils/Log.h>
+
+using namespace android::mediautils;
+
+TEST(mediautils_fixedstring_tests, ctor) {
+    FixedString<8> s0("abcde");
+
+    ASSERT_FALSE(s0.empty());
+    ASSERT_EQ(8U, s0.capacity());
+
+    ASSERT_EQ(5U, s0.size());
+    ASSERT_EQ(3U, s0.remaining());
+    ASSERT_EQ(0, strcmp(s0.c_str(), "abcde"));
+
+    ASSERT_EQ(0, strcmp(s0.data(), "abcde"));
+
+    // overflow
+    FixedString<8> s1("abcdefghijk");
+    ASSERT_EQ(8U, s1.size());
+    ASSERT_TRUE(s1.full());
+    ASSERT_EQ(0U, s1.remaining());
+    ASSERT_EQ(0, strcmp(s1.c_str(), "abcdefgh"));
+
+    // overflow
+    FixedString<8> s2(std::string("abcdefghijk"));
+    ASSERT_TRUE(s2.full());
+
+    ASSERT_EQ(8U, s2.size());
+    ASSERT_EQ(0, strcmp(s2.c_str(), "abcdefgh"));
+
+    // complex
+    ASSERT_EQ(s1, s2);
+    ASSERT_EQ(FixedString<12>().append(s1), s2);
+    ASSERT_NE(s1, "bcd");
+
+    // string and stringview
+    ASSERT_EQ(s1.asString(), s1.asStringView());
+
+    FixedString30 s3;
+    s3 = std::string("abcd");
+    ASSERT_EQ(s3, "abcd");
+
+    s3.clear();
+    ASSERT_EQ(s3, "");
+    ASSERT_NE(s3, "abcd");
+    ASSERT_EQ(0U, s3.size());
+}
+
+TEST(mediautils_fixedstring_tests, append) {
+    FixedString<8> s0;
+    ASSERT_EQ(0U, s0.size());
+    ASSERT_EQ(0, strcmp(s0.c_str(), ""));
+    ASSERT_TRUE(s0.empty());
+    ASSERT_FALSE(s0.full());
+
+    s0.append("abc");
+    ASSERT_EQ(3U, s0.size());
+    ASSERT_EQ(0, strcmp(s0.c_str(), "abc"));
+
+    s0.append(std::string("d"));
+    ASSERT_EQ(4U, s0.size());
+    ASSERT_EQ(0, strcmp(s0.c_str(), "abcd"));
+
+    // overflow
+    s0.append("efghijk");
+    ASSERT_EQ(8U, s0.size());
+    ASSERT_EQ(0, strcmp(s0.c_str(), "abcdefgh"));
+    ASSERT_TRUE(s0.full());
+
+    // concatenated
+    ASSERT_EQ(FixedString62("abcd"),
+            FixedString<8>("ab").append("c").append(FixedString<8>("d")));
+    ASSERT_EQ(FixedString<12>("a").append(FixedString<12>("b")), "ab");
+}
+
+TEST(mediautils_fixedstring_tests, plus_equals) {
+    FixedString<8> s0;
+    ASSERT_EQ(0U, s0.size());
+    ASSERT_EQ(0, strcmp(s0.c_str(), ""));
+
+    s0 += "abc";
+    s0 += "def";
+    ASSERT_EQ(s0, "abcdef");
+}
+
+TEST(mediautils_fixedstring_tests, stream_operator) {
+    FixedString<8> s0('a');
+
+    s0 << 'b' << "c" << "d" << '\n';
+    ASSERT_EQ(s0, "abcd\n");
+}
+
+TEST(mediautils_fixedstring_tests, examples) {
+    FixedString30 s1(std::string("a"));
+    s1 << "bc" << 'd' << '\n';
+    s1 += "hello";
+
+    ASSERT_EQ(s1, "abcd\nhello");
+
+    FixedString30 s2;
+    for (const auto &c : s1.asStringView()) {
+        s2.append(c);
+    };
+    ASSERT_EQ(s1, s2);
+
+    FixedString30 s3(std::move(s1));
+}
+
+// Ensure type alias works fine as well.
+using FixedString1024 = FixedString<1024>;
+
+TEST(mediautils_fixedstring_tests, copy) {
+    FixedString1024 s0("abc");
+    FixedString62 s1(s0);
+
+    ASSERT_EQ(3U, s1.size());
+    ASSERT_EQ(0, strcmp(s1.c_str(), "abc"));
+    ASSERT_EQ(s0, s1);
+
+    FixedString<1024> s2(s1);
+    ASSERT_EQ(3U, s2.size());
+    ASSERT_EQ(0, strcmp(s2.c_str(), "abc"));
+    ASSERT_EQ(s2, "abc");
+    ASSERT_NE(s2, "def");
+    ASSERT_EQ(s2, std::string("abc"));
+    ASSERT_NE(s2, std::string("def"));
+    ASSERT_EQ(s1, s2);
+    ASSERT_EQ(s0, s2);
+    ASSERT_EQ(s2, FixedString62(FixedString1024("abc")));
+}
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 533e0b3..3d44aec 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -178,6 +178,11 @@
 // Direct output thread minimum sleep time in idle or active(underrun) state
 static const nsecs_t kDirectMinSleepTimeUs = 10000;
 
+// Minimum amount of time between checking to see if the timestamp is advancing
+// for underrun detection. If we check too frequently, we may not detect a
+// timestamp update and will falsely detect underrun.
+static const nsecs_t kMinimumTimeBetweenTimestampChecksNs = 150 /* ms */ * 1000;
+
 // The universal constant for ubiquitous 20ms value. The value of 20ms seems to provide a good
 // balance between power consumption and latency, and allows threads to be scheduled reliably
 // by the CFS scheduler.
@@ -2040,7 +2045,8 @@
         mFastTrackAvailMask(((1 << FastMixerState::sMaxFastTracks) - 1) & ~1),
         mHwSupportsPause(false), mHwPaused(false), mFlushPending(false),
         mLeftVolFloat(-1.0), mRightVolFloat(-1.0),
-        mDownStreamPatch{}
+        mDownStreamPatch{},
+        mIsTimestampAdvancing(kMinimumTimeBetweenTimestampChecksNs)
 {
     snprintf(mThreadName, kThreadNameLength, "AudioOut_%X", id);
     mNBLogWriter = audioFlinger->newWriter_l(kLogSize, mThreadName);
@@ -3146,10 +3152,7 @@
     auto backInserter = std::back_inserter(metadata.tracks);
     for (const sp<Track> &track : mActiveTracks) {
         // No track is invalid as this is called after prepareTrack_l in the same critical section
-        // Do not forward metadata for PatchTrack with unspecified stream type
-        if (track->streamType() != AUDIO_STREAM_PATCH) {
-            track->copyMetadataTo(backInserter);
-        }
+        track->copyMetadataTo(backInserter);
     }
     sendMetadataToBackend_l(metadata);
 }
@@ -5907,18 +5910,35 @@
     return trackCount;
 }
 
-bool AudioFlinger::PlaybackThread::checkRunningTimestamp()
+bool AudioFlinger::PlaybackThread::IsTimestampAdvancing::check(AudioStreamOut * output)
 {
+    // Check the timestamp to see if it's advancing once every 150ms. If we check too frequently, we
+    // could falsely detect that the frame position has stalled due to underrun because we haven't
+    // given the Audio HAL enough time to update.
+    const nsecs_t nowNs = systemTime();
+    if (nowNs - mPreviousNs < mMinimumTimeBetweenChecksNs) {
+        return mLatchedValue;
+    }
+    mPreviousNs = nowNs;
+    mLatchedValue = false;
+    // Determine if the presentation position is still advancing.
     uint64_t position = 0;
     struct timespec unused;
-    const status_t ret = mOutput->getPresentationPosition(&position, &unused);
+    const status_t ret = output->getPresentationPosition(&position, &unused);
     if (ret == NO_ERROR) {
-        if (position != mLastCheckedTimestampPosition) {
-            mLastCheckedTimestampPosition = position;
-            return true;
+        if (position != mPreviousPosition) {
+            mPreviousPosition = position;
+            mLatchedValue = true;
         }
     }
-    return false;
+    return mLatchedValue;
+}
+
+void AudioFlinger::PlaybackThread::IsTimestampAdvancing::clear()
+{
+    mLatchedValue = true;
+    mPreviousPosition = 0;
+    mPreviousNs = 0;
 }
 
 // isTrackAllowed_l() must be called with ThreadBase::mLock held
@@ -6353,9 +6373,9 @@
                 // No buffers for this track. Give it a few chances to
                 // fill a buffer, then remove it from active list.
                 // Only consider last track started for mixer state control
+                bool isTimestampAdvancing = mIsTimestampAdvancing.check(mOutput);
                 if (--(track->mRetryCount) <= 0) {
-                    const bool running = checkRunningTimestamp();
-                    if (running) { // still running, give us more time.
+                    if (isTimestampAdvancing) { // HAL is still playing audio, give us more time.
                         track->mRetryCount = kMaxTrackRetriesOffload;
                     } else {
                         ALOGV("BUFFER TIMEOUT: remove track(%d) from active list", trackId);
@@ -6936,9 +6956,9 @@
             } else {
                 // No buffers for this track. Give it a few chances to
                 // fill a buffer, then remove it from active list.
+                bool isTimestampAdvancing = mIsTimestampAdvancing.check(mOutput);
                 if (--(track->mRetryCount) <= 0) {
-                    const bool running = checkRunningTimestamp();
-                    if (running) { // still running, give us more time.
+                    if (isTimestampAdvancing) { // HAL is still playing audio, give us more time.
                         track->mRetryCount = kMaxTrackRetriesOffload;
                     } else {
                         ALOGV("OffloadThread: BUFFER TIMEOUT: remove track(%d) from active list",
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index 2f85378..ad5617d 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -1172,7 +1172,7 @@
     volatile int32_t                mSuspended;
 
     int64_t                         mBytesWritten;
-    int64_t                         mFramesWritten; // not reset on standby
+    std::atomic<int64_t>            mFramesWritten; // not reset on standby
     int64_t                         mLastFramesWritten = -1; // track changes in timestamp
                                                              // server frames written.
     int64_t                         mSuspendedFrames; // not reset on standby
@@ -1386,6 +1386,7 @@
     virtual     bool        hasFastMixer() const = 0;
     virtual     FastTrackUnderruns getFastTrackUnderruns(size_t fastIndex __unused) const
                                 { FastTrackUnderruns dummy; return dummy; }
+                const std::atomic<int64_t>& framesWritten() const { return mFramesWritten; }
 
 protected:
                 // accessed by both binder threads and within threadLoop(), lock on mutex needed
@@ -1403,13 +1404,38 @@
 
                 std::atomic_bool mCheckOutputStageEffects{};
 
-                // A differential check on the timestamps to see if there is a change in the
-                // timestamp frame position between the last call to checkRunningTimestamp.
-                uint64_t mLastCheckedTimestampPosition = ~0LL;
 
-                bool checkRunningTimestamp();
+                // Provides periodic checking for timestamp advancement for underrun detection.
+                class IsTimestampAdvancing {
+                public:
+                    // The timestamp will not be checked any faster than the specified time.
+                    IsTimestampAdvancing(nsecs_t minimumTimeBetweenChecksNs)
+                        :   mMinimumTimeBetweenChecksNs(minimumTimeBetweenChecksNs)
+                    {
+                        clear();
+                    }
+                    // Check if the presentation position has advanced in the last periodic time.
+                    bool check(AudioStreamOut * output);
+                    // Clear the internal state when the playback state changes for the output
+                    // stream.
+                    void clear();
+                private:
+                    // The minimum time between timestamp checks.
+                    const nsecs_t mMinimumTimeBetweenChecksNs;
+                    // Add differential check on the timestamps to see if there is a change in the
+                    // timestamp frame position between the last call to check.
+                    uint64_t mPreviousPosition;
+                    // The time at which the last check occurred, to ensure we don't check too
+                    // frequently, giving the Audio HAL enough time to update its timestamps.
+                    nsecs_t mPreviousNs;
+                    // The valued is latched so we don't check timestamps too frequently.
+                    bool mLatchedValue;
+                };
+                IsTimestampAdvancing mIsTimestampAdvancing;
 
-    virtual     void flushHw_l() { mLastCheckedTimestampPosition = ~0LL; }
+    virtual     void flushHw_l() {
+                    mIsTimestampAdvancing.clear();
+                }
 };
 
 class MixerThread : public PlaybackThread {
diff --git a/services/audioflinger/TrackBase.h b/services/audioflinger/TrackBase.h
index 2677ab3..20bfbb0 100644
--- a/services/audioflinger/TrackBase.h
+++ b/services/audioflinger/TrackBase.h
@@ -397,6 +397,8 @@
     int64_t             mLogStartFrames = 0;    // Timestamp frames at start()
     double              mLogLatencyMs = 0.;     // Track the last log latency
 
+    bool                mLogForceVolumeUpdate = true; // force volume update to TrackMetrics.
+
     TrackMetrics        mTrackMetrics;
 
     bool                mServerLatencySupported = false;
diff --git a/services/audioflinger/TrackMetrics.h b/services/audioflinger/TrackMetrics.h
index 30d69ab..6fc70d6 100644
--- a/services/audioflinger/TrackMetrics.h
+++ b/services/audioflinger/TrackMetrics.h
@@ -64,7 +64,6 @@
                     AMEDIAMETRICS_PROP_EVENT_VALUE_BEGINAUDIOINTERVALGROUP, devices.c_str());
         }
         ++mIntervalCount;
-        mIntervalStartTimeNs = systemTime();
     }
 
     void logConstructor(pid_t creatorPid, uid_t creatorUid, int32_t internalTrackId,
@@ -90,11 +89,9 @@
     // Called when we are removed from the Thread.
     void logEndInterval() {
         std::lock_guard l(mLock);
-        if (mIntervalStartTimeNs != 0) {
-            const int64_t elapsedTimeNs = systemTime() - mIntervalStartTimeNs;
-            mIntervalStartTimeNs = 0;
-            mCumulativeTimeNs += elapsedTimeNs;
-            mDeviceTimeNs += elapsedTimeNs;
+        if (mLastVolumeChangeTimeNs != 0) {
+            logVolume_l(mVolume); // flush out the last volume.
+            mLastVolumeChangeTimeNs = 0;
         }
     }
 
@@ -133,20 +130,8 @@
 
     // may be called multiple times during an interval
     void logVolume(float volume) {
-        const int64_t timeNs = systemTime();
         std::lock_guard l(mLock);
-        if (mStartVolumeTimeNs == 0) {
-            mDeviceVolume = mVolume = volume;
-            mLastVolumeChangeTimeNs = mStartVolumeTimeNs = timeNs;
-            updateMinMaxVolume(0, mVolume);
-            return;
-        }
-        const int64_t durationNs = timeNs - mLastVolumeChangeTimeNs;
-        updateMinMaxVolume(durationNs, mVolume);
-        mDeviceVolume = (mDeviceVolume * (mLastVolumeChangeTimeNs - mStartVolumeTimeNs) +
-            mVolume * durationNs) / (timeNs - mStartVolumeTimeNs);
-        mVolume = volume;
-        mLastVolumeChangeTimeNs = timeNs;
+        logVolume_l(volume);
     }
 
     // Use absolute numbers returned by AudioTrackShared.
@@ -158,6 +143,7 @@
     }
 
 private:
+
     // no lock required - all arguments and constants.
     void deliverDeviceMetrics(const char *eventName, const char *devices) const {
         mediametrics::LogItem(mMetricsId)
@@ -167,6 +153,23 @@
            .record();
     }
 
+    void logVolume_l(float volume) REQUIRES(mLock) {
+        const int64_t timeNs = systemTime();
+        const int64_t durationNs = mLastVolumeChangeTimeNs == 0
+                ? 0 : timeNs - mLastVolumeChangeTimeNs;
+        if (durationNs > 0) {
+            // See West's algorithm for weighted averages
+            // https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
+            mDeviceVolume += (mVolume - mDeviceVolume) * durationNs
+                      / (durationNs + mDeviceTimeNs);
+            mDeviceTimeNs += durationNs;
+            mCumulativeTimeNs += durationNs;
+        }
+        updateMinMaxVolume(durationNs, mVolume); // always update.
+        mVolume = volume;
+        mLastVolumeChangeTimeNs = timeNs;
+    }
+
     void deliverCumulativeMetrics(const char *eventName) const REQUIRES(mLock) {
         if (mIntervalCount > 0) {
             mediametrics::LogItem item(mMetricsId);
@@ -199,14 +202,12 @@
         // mDevices is not reset by resetIntervalGroupMetrics.
 
         mIntervalCount = 0;
-        mIntervalStartTimeNs = 0;
         // mCumulativeTimeNs is not reset by resetIntervalGroupMetrics.
         mDeviceTimeNs = 0;
 
         mVolume = 0.f;
         mDeviceVolume = 0.f;
-        mStartVolumeTimeNs = 0;
-        mLastVolumeChangeTimeNs = 0;
+        mLastVolumeChangeTimeNs = 0;  // last time volume logged, cleared on endInterval
         mMinVolume = AMEDIAMETRICS_INITIAL_MIN_VOLUME;
         mMaxVolume = AMEDIAMETRICS_INITIAL_MAX_VOLUME;
         mMinVolumeDurationNs = 0;
@@ -230,14 +231,12 @@
 
     // Number of intervals and playing time
     int32_t           mIntervalCount GUARDED_BY(mLock) = 0;
-    int64_t           mIntervalStartTimeNs GUARDED_BY(mLock) = 0;
-    int64_t           mCumulativeTimeNs GUARDED_BY(mLock) = 0;
-    int64_t           mDeviceTimeNs GUARDED_BY(mLock) = 0;
+    int64_t           mCumulativeTimeNs GUARDED_BY(mLock) = 0; // total time.
+    int64_t           mDeviceTimeNs GUARDED_BY(mLock) = 0;     // time on device.
 
     // Average volume
-    double            mVolume GUARDED_BY(mLock) = 0.f;
-    double            mDeviceVolume GUARDED_BY(mLock) = 0.f;
-    int64_t           mStartVolumeTimeNs GUARDED_BY(mLock) = 0;
+    double            mVolume GUARDED_BY(mLock) = 0.f;       // last set volume.
+    double            mDeviceVolume GUARDED_BY(mLock) = 0.f; // running average volume.
     int64_t           mLastVolumeChangeTimeNs GUARDED_BY(mLock) = 0;
 
     // Min/Max volume
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 6135020..95ca855 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -1094,12 +1094,22 @@
                     __func__, mId, (int)mThreadIoHandle);
         }
 
-        // states to reset position info for non-offloaded/direct tracks
-        if (!isOffloaded() && !isDirect()
+        PlaybackThread *playbackThread = (PlaybackThread *)thread.get();
+
+        // states to reset position info for pcm tracks
+        if (audio_is_linear_pcm(mFormat)
                 && (state == IDLE || state == STOPPED || state == FLUSHED)) {
             mFrameMap.reset();
+
+            if (!isFastTrack() && (isDirect() || isOffloaded())) {
+                // Start point of track -> sink frame map. If the HAL returns a
+                // frame position smaller than the first written frame in
+                // updateTrackFrameInfo, the timestamp can be interpolated
+                // instead of using a larger value.
+                mFrameMap.push(mAudioTrackServerProxy->framesReleased(),
+                               playbackThread->framesWritten());
+            }
         }
-        PlaybackThread *playbackThread = (PlaybackThread *)thread.get();
         if (isFastTrack()) {
             // refresh fast track underruns on start because that field is never cleared
             // by the fast mixer; furthermore, the same track can be recycled, i.e. start
@@ -1123,6 +1133,7 @@
                     .mPosition[ExtendedTimestamp::LOCATION_KERNEL];
             mLogLatencyMs = 0.;
         }
+        mLogForceVolumeUpdate = true;  // at least one volume logged for metrics when starting.
 
         if (status == NO_ERROR || status == ALREADY_EXISTS) {
             // for streaming tracks, remove the buffer read stop limit.
@@ -1394,12 +1405,21 @@
     if (mFinalVolume != volume) { // Compare to an epsilon if too many meaningless updates
         mFinalVolume = volume;
         setMetadataHasChanged();
-        mTrackMetrics.logVolume(volume);
+        mLogForceVolumeUpdate = true;
+    }
+    if (mLogForceVolumeUpdate) {
+        mLogForceVolumeUpdate = false;
+        mTrackMetrics.logVolume(mFinalVolume);
     }
 }
 
 void AudioFlinger::PlaybackThread::Track::copyMetadataTo(MetadataInserter& backInserter) const
 {
+    // Do not forward metadata for PatchTrack with unspecified stream type
+    if (mStreamType == AUDIO_STREAM_PATCH) {
+        return;
+    }
+
     playback_track_metadata_v7_t metadata;
     metadata.base = {
             .usage = mAttr.usage,
diff --git a/services/audiopolicy/config/bluetooth_with_le_audio_policy_configuration_7_0.xml b/services/audiopolicy/config/bluetooth_with_le_audio_policy_configuration_7_0.xml
index e7908eb..c453dea 100644
--- a/services/audiopolicy/config/bluetooth_with_le_audio_policy_configuration_7_0.xml
+++ b/services/audiopolicy/config/bluetooth_with_le_audio_policy_configuration_7_0.xml
@@ -12,6 +12,7 @@
         </mixPort>
         <!-- Le Audio Audio Ports -->
         <mixPort name="le audio output" role="source" />
+        <mixPort name="le audio broadcast output" role="source" />
         <mixPort name="le audio input" role="sink">
             <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
                      samplingRates="8000 16000 24000 32000 44100 48000"
@@ -47,6 +48,7 @@
         <devicePort tagName="BLE Headset Out" type="AUDIO_DEVICE_OUT_BLE_HEADSET" role="sink"/>
         <devicePort tagName="BLE Speaker Out" type="AUDIO_DEVICE_OUT_BLE_SPEAKER" role="sink"/>
         <devicePort tagName="BLE Headset In" type="AUDIO_DEVICE_IN_BLE_HEADSET" role="source"/>
+        <devicePort tagName="BLE Broadcast Out" type="AUDIO_DEVICE_OUT_BLE_BROADCAST" role="sink"/>
     </devicePorts>
     <routes>
         <route type="mix" sink="BT A2DP Out"
@@ -63,5 +65,7 @@
                sources="BLE Headset In"/>
         <route type="mix" sink="BLE Speaker Out"
                sources="le audio output"/>
+        <route type="mix" sink="BLE Broadcast Out"
+               sources="le audio broadcast output"/>
     </routes>
 </module>
diff --git a/services/audiopolicy/enginedefault/src/Engine.cpp b/services/audiopolicy/enginedefault/src/Engine.cpp
index d4d514d..08d6453 100644
--- a/services/audiopolicy/enginedefault/src/Engine.cpp
+++ b/services/audiopolicy/enginedefault/src/Engine.cpp
@@ -195,6 +195,12 @@
                     AUDIO_DEVICE_OUT_BLUETOOTH_A2DP, AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES,
                     AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER, }));
         }
+        // If connected to a dock, never use the device speaker for calls
+        if (!availableOutputDevices.getDevicesFromTypes({AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET})
+                .isEmpty()) {
+            availableOutputDevices.remove(
+                    availableOutputDevices.getDevicesFromTypes({AUDIO_DEVICE_OUT_SPEAKER}));
+        }
         } break;
     case STRATEGY_ACCESSIBILITY: {
         // do not route accessibility prompts to a digital output currently configured with a
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 83de3e2..8586f6f 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -1884,7 +1884,8 @@
     //    (see b/200293124, the incorrect selection of AUDIO_OUTPUT_FLAG_VOIP_RX).
     // 3: the output supporting the exact channel mask
     // 4: the output with a higher channel count than requested
-    // 5: the output with a higher sampling rate than requested
+    // 5: the output with the highest sampling rate if the requested sample rate is
+    //    greater than default sampling rate
     // 6: the output with the highest number of requested performance flags
     // 7: the output with the bit depth the closest to the requested one
     // 8: the primary output
@@ -1944,8 +1945,7 @@
         }
 
         // sampling rate match
-        if (samplingRate > SAMPLE_RATE_HZ_DEFAULT &&
-                samplingRate <= outputDesc->getSamplingRate()) {
+        if (samplingRate > SAMPLE_RATE_HZ_DEFAULT) {
             currentMatchCriteria[4] = outputDesc->getSamplingRate();
         }
 
diff --git a/services/audiopolicy/service/Spatializer.cpp b/services/audiopolicy/service/Spatializer.cpp
index f19665d..b6b90ff 100644
--- a/services/audiopolicy/service/Spatializer.cpp
+++ b/services/audiopolicy/service/Spatializer.cpp
@@ -59,11 +59,13 @@
        if (!_tmp.ok()) return aidl_utils::binderStatusFromStatusT(_tmp.error()); \
        std::move(_tmp.value()); })
 
-audio_channel_mask_t getMaxChannelMask(std::vector<audio_channel_mask_t> masks) {
+static audio_channel_mask_t getMaxChannelMask(
+        const std::vector<audio_channel_mask_t>& masks, size_t channelLimit = SIZE_MAX) {
     uint32_t maxCount = 0;
     audio_channel_mask_t maxMask = AUDIO_CHANNEL_NONE;
     for (auto mask : masks) {
         const size_t count = audio_channel_count_from_out_mask(mask);
+        if (count > channelLimit) continue;  // ignore masks greater than channelLimit
         if (count > maxCount) {
             maxMask = mask;
             maxCount = count;
@@ -85,6 +87,7 @@
         kWhatOnFramesProcessed,    // AudioEffect::EVENT_FRAMES_PROCESSED
         kWhatOnHeadToStagePose,    // SpatializerPoseController::Listener::onHeadToStagePose
         kWhatOnActualModeChange,   // SpatializerPoseController::Listener::onActualModeChange
+        kWhatOnLatencyModesChanged, // Spatializer::onSupportedLatencyModesChanged
     };
     static constexpr const char *kNumFramesKey = "numFrames";
     static constexpr const char *kModeKey = "mode";
@@ -94,15 +97,27 @@
     static constexpr const char *kRotation0Key = "rotation0";
     static constexpr const char *kRotation1Key = "rotation1";
     static constexpr const char *kRotation2Key = "rotation2";
+    static constexpr const char *kLatencyModesKey = "latencyModes";
+
+    class LatencyModes : public RefBase {
+    public:
+        LatencyModes(audio_io_handle_t output,
+                const std::vector<audio_latency_mode_t>& latencyModes)
+            : mOutput(output), mLatencyModes(latencyModes) {}
+        ~LatencyModes() = default;
+
+        audio_io_handle_t mOutput;
+        std::vector<audio_latency_mode_t> mLatencyModes;
+    };
 
     void onMessageReceived(const sp<AMessage> &msg) override {
+        sp<Spatializer> spatializer = mSpatializer.promote();
+        if (spatializer == nullptr) {
+            ALOGW("%s: Cannot promote spatializer", __func__);
+            return;
+        }
         switch (msg->what()) {
             case kWhatOnFramesProcessed: {
-                sp<Spatializer> spatializer = mSpatializer.promote();
-                if (spatializer == nullptr) {
-                    ALOGW("%s: Cannot promote spatializer", __func__);
-                    return;
-                }
                 int numFrames;
                 if (!msg->findInt32(kNumFramesKey, &numFrames)) {
                     ALOGE("%s: Cannot find num frames!", __func__);
@@ -113,11 +128,6 @@
                 }
                 } break;
             case kWhatOnHeadToStagePose: {
-                sp<Spatializer> spatializer = mSpatializer.promote();
-                if (spatializer == nullptr) {
-                    ALOGW("%s: Cannot promote spatializer", __func__);
-                    return;
-                }
                 std::vector<float> headToStage(sHeadPoseKeys.size());
                 for (size_t i = 0 ; i < sHeadPoseKeys.size(); i++) {
                     if (!msg->findFloat(sHeadPoseKeys[i], &headToStage[i])) {
@@ -128,18 +138,25 @@
                 spatializer->onHeadToStagePoseMsg(headToStage);
                 } break;
             case kWhatOnActualModeChange: {
-                sp<Spatializer> spatializer = mSpatializer.promote();
-                if (spatializer == nullptr) {
-                    ALOGW("%s: Cannot promote spatializer", __func__);
-                    return;
-                }
                 int mode;
-                if (!msg->findInt32(EngineCallbackHandler::kModeKey, &mode)) {
+                if (!msg->findInt32(kModeKey, &mode)) {
                     ALOGE("%s: Cannot find actualMode!", __func__);
                     return;
                 }
                 spatializer->onActualModeChangeMsg(static_cast<HeadTrackingMode>(mode));
                 } break;
+
+            case kWhatOnLatencyModesChanged: {
+                sp<RefBase> object;
+                if (!msg->findObject(kLatencyModesKey, &object)) {
+                    ALOGE("%s: Cannot find latency modes!", __func__);
+                    return;
+                }
+                sp<LatencyModes> latencyModes = static_cast<LatencyModes*>(object.get());
+                spatializer->onSupportedLatencyModesChangedMsg(
+                    latencyModes->mOutput, std::move(latencyModes->mLatencyModes));
+                } break;
+
             default:
                 LOG_ALWAYS_FATAL("Invalid callback message %d", msg->what());
         }
@@ -223,9 +240,12 @@
         spatializer = new Spatializer(descriptors[0], callback);
         if (spatializer->loadEngineConfiguration(effect) != NO_ERROR) {
             spatializer.clear();
+            ALOGW("%s loadEngine error: %d  effect Id %" PRId64,
+                    __func__, status, effect ? effect->effectId() : 0);
+        } else {
+            spatializer->mLocalLog.log("%s with effect Id %" PRId64, __func__,
+                                       effect ? effect->effectId() : 0);
         }
-        spatializer->mLocalLog.log("%s with effect Id %" PRId64, __func__,
-                                   effect ? effect->effectId() : 0);
     }
 
     return spatializer;
@@ -259,6 +279,16 @@
     mHandler.clear();
 }
 
+static std::string channelMaskVectorToString(
+        const std::vector<audio_channel_mask_t>& masks) {
+    std::stringstream ss;
+    for (const auto &mask : masks) {
+        if (ss.tellp() != 0) ss << "|";
+        ss << mask;
+    }
+    return ss.str();
+}
+
 status_t Spatializer::loadEngineConfiguration(sp<EffectHalInterface> effect) {
     ALOGV("%s", __func__);
 
@@ -348,7 +378,7 @@
     }
     mediametrics::LogItem(mMetricsId)
         .set(AMEDIAMETRICS_PROP_EVENT, AMEDIAMETRICS_PROP_EVENT_VALUE_CREATE)
-        .set(AMEDIAMETRICS_PROP_CHANNELMASK, (int32_t)getMaxChannelMask(mChannelMasks))
+        .set(AMEDIAMETRICS_PROP_CHANNELMASKS, channelMaskVectorToString(mChannelMasks))
         .set(AMEDIAMETRICS_PROP_LEVELS, aidl_utils::enumsToString(mLevels))
         .set(AMEDIAMETRICS_PROP_MODES, aidl_utils::enumsToString(mSpatializationModes))
         .set(AMEDIAMETRICS_PROP_HEADTRACKINGMODES, aidl_utils::enumsToString(mHeadTrackingModes))
@@ -362,7 +392,7 @@
     std::lock_guard lock(mLock);
     audio_config_base_t config = AUDIO_CONFIG_BASE_INITIALIZER;
     // For now use highest supported channel count
-    config.channel_mask = getMaxChannelMask(mChannelMasks);
+    config.channel_mask = getMaxChannelMask(mChannelMasks, FCC_LIMIT);
     return config;
 }
 
@@ -850,9 +880,21 @@
 
 void Spatializer::onSupportedLatencyModesChanged(
         audio_io_handle_t output, const std::vector<audio_latency_mode_t>& modes) {
+    ALOGV("%s output %d num modes %zu", __func__, (int)output, modes.size());
+    sp<AMessage> msg =
+            new AMessage(EngineCallbackHandler::kWhatOnLatencyModesChanged, mHandler);
+    msg->setObject(EngineCallbackHandler::kLatencyModesKey,
+        sp<EngineCallbackHandler::LatencyModes>::make(output, modes));
+    msg->post();
+}
+
+void Spatializer::onSupportedLatencyModesChangedMsg(
+        audio_io_handle_t output, std::vector<audio_latency_mode_t>&& modes) {
     std::lock_guard lock(mLock);
+    ALOGV("%s output %d mOutput %d num modes %zu",
+            __func__, (int)output, (int)mOutput, modes.size());
     if (output == mOutput) {
-        mSupportedLatencyModes = modes;
+        mSupportedLatencyModes = std::move(modes);
         checkSensorsState_l();
     }
 }
@@ -872,8 +914,8 @@
     bool lowLatencySupported = mSupportedLatencyModes.empty()
             || (std::find(mSupportedLatencyModes.begin(), mSupportedLatencyModes.end(),
                     AUDIO_LATENCY_MODE_LOW) != mSupportedLatencyModes.end());
-    if (mSupportsHeadTracking && mPoseController != nullptr && lowLatencySupported) {
-        if (mNumActiveTracks > 0 && mLevel != SpatializationLevel::NONE
+    if (mSupportsHeadTracking && mPoseController != nullptr) {
+        if (lowLatencySupported && mNumActiveTracks > 0 && mLevel != SpatializationLevel::NONE
             && mDesiredHeadTrackingMode != HeadTrackingMode::STATIC
             && mHeadSensor != SpatializerPoseController::INVALID_SENSOR) {
             mPoseController->setHeadSensor(mHeadSensor);
diff --git a/services/audiopolicy/service/Spatializer.h b/services/audiopolicy/service/Spatializer.h
index 6989a55..c9071d4 100644
--- a/services/audiopolicy/service/Spatializer.h
+++ b/services/audiopolicy/service/Spatializer.h
@@ -210,6 +210,8 @@
 
     void onHeadToStagePoseMsg(const std::vector<float>& headToStage);
     void onActualModeChangeMsg(media::HeadTrackingMode mode);
+    void onSupportedLatencyModesChangedMsg(
+            audio_io_handle_t output, std::vector<audio_latency_mode_t>&& modes);
 
     static constexpr int kMaxEffectParamValues = 10;
     /**
diff --git a/services/audiopolicy/service/SpatializerPoseController.cpp b/services/audiopolicy/service/SpatializerPoseController.cpp
index e012a0b..8624aa1 100644
--- a/services/audiopolicy/service/SpatializerPoseController.cpp
+++ b/services/audiopolicy/service/SpatializerPoseController.cpp
@@ -52,7 +52,9 @@
 constexpr auto kPredictionDuration = 50ms;
 
 // After not getting a pose sample for this long, we would treat the measurement as stale.
-constexpr auto kFreshnessTimeout = 50ms;
+// The max connection interval is 50ms, and HT sensor event interval can differ depending on the
+// sampling rate, scheduling, sensor eventQ FIFO etc. 120 (2 * 50 + 20) ms seems reasonable for now.
+constexpr auto kFreshnessTimeout = 120ms;
 
 // Auto-recenter kicks in after the head has been still for this long.
 constexpr auto kAutoRecenterWindowDuration = 6s;
@@ -65,13 +67,13 @@
 
 // Screen is considered to be unstable (not still) if it has moved significantly within the last
 // time window of this duration.
-constexpr auto kScreenStillnessWindowDuration = 3s;
+constexpr auto kScreenStillnessWindowDuration = 750ms;
 
 // Screen is considered to have moved significantly if translated by this much (in meter, approx).
 constexpr float kScreenStillnessTranslationThreshold = 0.1f;
 
 // Screen is considered to have moved significantly if rotated by this much (in radians, approx).
-constexpr float kScreenStillnessRotationThreshold = 7.0f / 180 * M_PI;
+constexpr float kScreenStillnessRotationThreshold = 15.0f / 180 * M_PI;
 
 // Time units for system clock ticks. This is what the Sensor Framework timestamps represent and
 // what we use for pose filtering.
diff --git a/services/mediametrics/AudioAnalytics.cpp b/services/mediametrics/AudioAnalytics.cpp
index 99e3691..12593ff 100644
--- a/services/mediametrics/AudioAnalytics.cpp
+++ b/services/mediametrics/AudioAnalytics.cpp
@@ -240,6 +240,35 @@
     "sharing_requested",
 };
 
+static constexpr const char * HeadTrackerDeviceEnabledFields[] {
+    "mediametrics_headtrackerdeviceenabled_reported",
+    "type",
+    "event",
+    "enabled",
+};
+
+static constexpr const char * HeadTrackerDeviceSupportedFields[] {
+    "mediametrics_headtrackerdevicesupported_reported",
+    "type",
+    "event",
+    "supported",
+};
+
+static constexpr const char * SpatializerCapabilitiesFields[] {
+    "mediametrics_spatializer_reported",
+    "head_tracking_modes",
+    "spatializer_levels",
+    "spatializer_modes",
+    "channel_masks",
+};
+
+static constexpr const char * SpatializerDeviceEnabledFields[] {
+    "mediametrics_spatializerdeviceenabled_reported",
+    "type",
+    "event",
+    "enabled",
+};
+
 /**
  * printFields is a helper method that prints the fields and corresponding values
  * in a human readable style.
@@ -459,6 +488,15 @@
             [this](const std::shared_ptr<const android::mediametrics::Item> &item){
                 mAudioPowerUsage.checkCreatePatch(item);
             }));
+
+    // Handle Spatializer - these keys are prefixed by "audio.spatializer."
+    mActions.addAction(
+        AMEDIAMETRICS_KEY_PREFIX_AUDIO_SPATIALIZER "*." AMEDIAMETRICS_PROP_EVENT,
+        std::monostate{}, /* match any event */
+        std::make_shared<AnalyticsActions::Function>(
+            [this](const std::shared_ptr<const android::mediametrics::Item> &item){
+                mSpatializer.onEvent(item);
+            }));
 }
 
 AudioAnalytics::~AudioAnalytics()
@@ -1525,5 +1563,173 @@
     return { s, n };
 }
 
+// Classifies the setting event for statsd (use generated statsd enums.proto constants).
+static int32_t classifySettingEvent(bool isSetAlready, bool withinBoot) {
+    if (isSetAlready) {
+        return util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__EVENT__SPATIALIZER_SETTING_EVENT_NORMAL;
+    }
+    if (withinBoot) {
+        return util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__EVENT__SPATIALIZER_SETTING_EVENT_BOOT;
+    }
+    return util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__EVENT__SPATIALIZER_SETTING_EVENT_FIRST;
+}
+
+void AudioAnalytics::Spatializer::onEvent(
+        const std::shared_ptr<const android::mediametrics::Item> &item)
+{
+    const auto key = item->getKey();
+
+    if (!startsWith(key, AMEDIAMETRICS_KEY_PREFIX_AUDIO_SPATIALIZER)) return;
+
+    const std::string suffix =
+            key.substr(std::size(AMEDIAMETRICS_KEY_PREFIX_AUDIO_SPATIALIZER) - 1);
+
+    std::string eventStr; // optional - find the actual event string.
+    (void)item->get(AMEDIAMETRICS_PROP_EVENT, &eventStr);
+
+    const size_t delim = suffix.find('.'); // note could use split.
+    if (delim == suffix.npos) {
+        // on create with suffix == "0" for the first spatializer effect.
+
+        std::string headTrackingModes;
+        (void)item->get(AMEDIAMETRICS_PROP_HEADTRACKINGMODES, &headTrackingModes);
+
+        std::string levels;
+        (void)item->get(AMEDIAMETRICS_PROP_LEVELS, &levels);
+
+        std::string modes;
+        (void)item->get(AMEDIAMETRICS_PROP_MODES, &modes);
+
+        std::string channelMasks;
+        (void)item->get(AMEDIAMETRICS_PROP_CHANNELMASKS, &channelMasks);
+
+        LOG(LOG_LEVEL) << "key:" << key
+                << " headTrackingModes:" << headTrackingModes
+                << " levels:" << levels
+                << " modes:" << modes
+                << " channelMasks:" << channelMasks
+                ;
+
+        const std::vector<int32_t> headTrackingModesVector =
+                types::vectorFromMap(headTrackingModes, types::getHeadTrackingModeMap());
+        const std::vector<int32_t> levelsVector =
+                types::vectorFromMap(levels, types::getSpatializerLevelMap());
+        const std::vector<int32_t> modesVector =
+                types::vectorFromMap(modes, types::getSpatializerModeMap());
+        const std::vector<int64_t> channelMasksVector =
+                types::channelMaskVectorFromString(channelMasks);
+
+        const auto [ result, str ] = sendToStatsd(SpatializerCapabilitiesFields,
+                CONDITION(android::util::MEDIAMETRICS_SPATIALIZERCAPABILITIES_REPORTED)
+                , headTrackingModesVector
+                , levelsVector
+                , modesVector
+                , channelMasksVector
+                );
+
+        mAudioAnalytics.mStatsdLog->log(
+                android::util::MEDIAMETRICS_SPATIALIZERCAPABILITIES_REPORTED, str);
+
+        std::lock_guard lg(mLock);
+        if (mFirstCreateTimeNs == 0) {
+            // Only update the create time once to prevent audioserver restart
+            // from looking like a boot.
+            mFirstCreateTimeNs = item->getTimestamp();
+        }
+        mSimpleLog.log("%s suffix: %s item: %s",
+                __func__, suffix.c_str(), item->toString().c_str());
+    } else {
+        std::string subtype = suffix.substr(0, delim);
+        if (subtype != "device") return; // not a device.
+
+        const std::string deviceType = suffix.substr(std::size("device.") - 1);
+
+        const int32_t deviceTypeStatsd =
+                types::lookup<types::AUDIO_DEVICE_INFO_TYPE, int32_t>(deviceType);
+
+        std::string address;
+        (void)item->get(AMEDIAMETRICS_PROP_ADDRESS, &address);
+        std::string enabled;
+        (void)item->get(AMEDIAMETRICS_PROP_ENABLED, &enabled);
+        std::string hasHeadTracker;
+        (void)item->get(AMEDIAMETRICS_PROP_HASHEADTRACKER, &hasHeadTracker);
+        std::string headTrackerEnabled;
+        (void)item->get(AMEDIAMETRICS_PROP_HEADTRACKERENABLED, &headTrackerEnabled);
+
+        std::lock_guard lg(mLock);
+
+        // Validate from our cached state
+
+        // Our deviceKey takes the device type and appends the address if any.
+        // This distinguishes different wireless devices for the purposes of tracking.
+        std::string deviceKey(deviceType);
+        deviceKey.append("_").append(address);
+        DeviceState& deviceState = mDeviceStateMap[deviceKey];
+
+        // check whether the settings event is within a certain time of spatializer creation.
+        const bool withinBoot =
+                item->getTimestamp() - mFirstCreateTimeNs < kBootDurationThreshold;
+
+        if (!enabled.empty()) {
+            if (enabled != deviceState.enabled) {
+                const int32_t settingEventStatsd =
+                        classifySettingEvent(!deviceState.enabled.empty(), withinBoot);
+                deviceState.enabled = enabled;
+                const bool enabledStatsd = enabled == "true";
+                const auto [ result, str ] = sendToStatsd(SpatializerDeviceEnabledFields,
+                        CONDITION(android::util::MEDIAMETRICS_SPATIALIZERDEVICEENABLED_REPORTED)
+                        , deviceTypeStatsd
+                        , settingEventStatsd
+                        , enabledStatsd
+                        );
+                mAudioAnalytics.mStatsdLog->log(
+                        android::util::MEDIAMETRICS_SPATIALIZERDEVICEENABLED_REPORTED, str);
+            }
+        }
+        if (!hasHeadTracker.empty()) {
+            if (hasHeadTracker != deviceState.hasHeadTracker) {
+                const int32_t settingEventStatsd =
+                        classifySettingEvent(!deviceState.hasHeadTracker.empty(), withinBoot);
+                deviceState.hasHeadTracker = hasHeadTracker;
+                const bool supportedStatsd = hasHeadTracker == "true";
+                const auto [ result, str ] = sendToStatsd(HeadTrackerDeviceSupportedFields,
+                        CONDITION(android::util::MEDIAMETRICS_HEADTRACKERDEVICESUPPORTED_REPORTED)
+                        , deviceTypeStatsd
+                        , settingEventStatsd
+                        , supportedStatsd
+                        );
+                mAudioAnalytics.mStatsdLog->log(
+                        android::util::MEDIAMETRICS_HEADTRACKERDEVICESUPPORTED_REPORTED, str);
+            }
+        }
+        if (!headTrackerEnabled.empty()) {
+            if (headTrackerEnabled != deviceState.headTrackerEnabled) {
+                const int32_t settingEventStatsd =
+                        classifySettingEvent(!deviceState.headTrackerEnabled.empty(), withinBoot);
+                deviceState.headTrackerEnabled = headTrackerEnabled;
+                const bool enabledStatsd = headTrackerEnabled == "true";
+                const auto [ result, str ] = sendToStatsd(HeadTrackerDeviceEnabledFields,
+                        CONDITION(android::util::MEDIAMETRICS_HEADTRACKERDEVICEENABLED_REPORTED)
+                        , deviceTypeStatsd
+                        , settingEventStatsd
+                        , enabledStatsd
+                        );
+                mAudioAnalytics.mStatsdLog->log(
+                        android::util::MEDIAMETRICS_HEADTRACKERDEVICEENABLED_REPORTED, str);
+            }
+        }
+        mSimpleLog.log("%s deviceKey: %s item: %s",
+                __func__, deviceKey.c_str(), item->toString().c_str());
+    }
+}
+
+std::pair<std::string, int32_t> AudioAnalytics::Spatializer::dump(
+        int32_t lines, const char *prefix) const
+{
+    std::lock_guard lg(mLock);
+    std::string s = mSimpleLog.dumpToString(prefix == nullptr ? "" : prefix, lines);
+    size_t n = std::count(s.begin(), s.end(), '\n');
+    return { s, n };
+}
 
 } // namespace android::mediametrics
diff --git a/services/mediametrics/AudioTypes.cpp b/services/mediametrics/AudioTypes.cpp
index 6e24a58..d2b4aab 100644
--- a/services/mediametrics/AudioTypes.cpp
+++ b/services/mediametrics/AudioTypes.cpp
@@ -135,6 +135,94 @@
     return map;
 }
 
+// A map for the Java AudioDeviceInfo types to internal (native) output devices.
+const std::unordered_map<std::string, int32_t>& getAudioDeviceOutCompactMap() {
+    // DO NOT MODIFY VALUES (OK to add new ones).
+    static std::unordered_map<std::string, int32_t> map{
+        // should "unknown" go to AUDIO_DEVICE_NONE?
+        {"earpiece", AUDIO_DEVICE_OUT_EARPIECE},
+        {"speaker", AUDIO_DEVICE_OUT_SPEAKER},
+        {"headset", AUDIO_DEVICE_OUT_WIRED_HEADSET},
+        {"headphone", AUDIO_DEVICE_OUT_WIRED_HEADPHONE},
+        {"bt_sco", AUDIO_DEVICE_OUT_BLUETOOTH_SCO},
+        {"bt_sco_hs", AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET},
+        {"bt_sco_carkit", AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT},
+        {"bt_a2dp", AUDIO_DEVICE_OUT_BLUETOOTH_A2DP},
+        {"bt_a2dp_hp", AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES},
+        {"bt_a2dp_spk", AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER},
+        {"aux_digital", AUDIO_DEVICE_OUT_AUX_DIGITAL},
+        {"hdmi", AUDIO_DEVICE_OUT_HDMI},
+        {"analog_dock", AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET},
+        {"digital_dock", AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET},
+        {"usb_accessory", AUDIO_DEVICE_OUT_USB_ACCESSORY},
+        {"usb_device", AUDIO_DEVICE_OUT_USB_DEVICE},
+        {"remote_submix", AUDIO_DEVICE_OUT_REMOTE_SUBMIX},
+        {"telephony_tx", AUDIO_DEVICE_OUT_TELEPHONY_TX},
+        {"line", AUDIO_DEVICE_OUT_LINE},
+        {"hdmi_arc", AUDIO_DEVICE_OUT_HDMI_ARC},
+        {"hdmi_earc", AUDIO_DEVICE_OUT_HDMI_EARC},
+        {"spdif", AUDIO_DEVICE_OUT_SPDIF},
+        {"fm_transmitter", AUDIO_DEVICE_OUT_FM},
+        {"aux_line", AUDIO_DEVICE_OUT_AUX_LINE},
+        {"speaker_safe", AUDIO_DEVICE_OUT_SPEAKER_SAFE},
+        {"ip", AUDIO_DEVICE_OUT_IP},
+        {"bus", AUDIO_DEVICE_OUT_BUS},
+        {"proxy", AUDIO_DEVICE_OUT_PROXY},
+        {"usb_headset", AUDIO_DEVICE_OUT_USB_HEADSET},
+        {"hearing_aid_out", AUDIO_DEVICE_OUT_HEARING_AID},
+        {"echo_canceller", AUDIO_DEVICE_OUT_ECHO_CANCELLER},
+        // default does not exist
+        {"ble_headset", AUDIO_DEVICE_OUT_BLE_HEADSET},
+        {"ble_speaker", AUDIO_DEVICE_OUT_BLE_SPEAKER},
+        {"ble_broadcast", AUDIO_DEVICE_OUT_BLE_BROADCAST},
+    };
+    return map;
+}
+
+// A map for the Java AudioDeviceInfo types.
+// This uses generated statsd enums.proto constants.
+const std::unordered_map<std::string, int32_t>& getAudioDeviceInfoTypeMap() {
+    // DO NOT MODIFY VALUES (OK to add new ones).
+    static std::unordered_map<std::string, int32_t> map{
+        {"unknown", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_UNKNOWN},
+        {"earpiece", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BUILTIN_EARPIECE},
+        {"speaker", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BUILTIN_SPEAKER},
+        {"headset", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_WIRED_HEADSET},
+        {"headphone", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_WIRED_HEADPHONES}, // sic
+        {"bt_sco", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLUETOOTH_SCO},
+        {"bt_sco_hs", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLUETOOTH_SCO},
+        {"bt_sco_carkit", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLUETOOTH_SCO},
+        {"bt_a2dp", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLUETOOTH_A2DP},
+        {"bt_a2dp_hp", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLUETOOTH_A2DP},
+        {"bt_a2dp_spk", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLUETOOTH_A2DP},
+        {"aux_digital", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_HDMI},
+        {"hdmi", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_HDMI},
+        {"analog_dock", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_DOCK},
+        {"digital_dock", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_DOCK},
+        {"usb_accessory", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_USB_ACCESSORY},
+        {"usb_device", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_USB_DEVICE},
+        {"usb_headset", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_USB_HEADSET},
+        {"remote_submix", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_REMOTE_SUBMIX},
+        {"telephony_tx", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_TELEPHONY},
+        {"line", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_LINE_ANALOG},
+        {"hdmi_arc", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_HDMI_ARC},
+        {"hdmi_earc", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_HDMI_EARC},
+        {"spdif", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_LINE_DIGITAL},
+        {"fm_transmitter", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_FM},
+        {"aux_line", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_AUX_LINE},
+        {"speaker_safe", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BUILTIN_SPEAKER_SAFE},
+        {"ip", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_IP},
+        {"bus", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BUS},
+        {"proxy", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_UNKNOWN /* AUDIO_DEVICE_INFO_TYPE_PROXY */},
+        {"hearing_aid_out", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_HEARING_AID},
+        {"echo_canceller", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_ECHO_REFERENCE}, // sic
+        {"ble_headset", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLE_HEADSET},
+        {"ble_speaker", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLE_SPEAKER},
+        {"ble_broadcast", util::MEDIAMETRICS_SPATIALIZER_DEVICE_ENABLED_REPORTED__TYPE__AUDIO_DEVICE_INFO_TYPE_BLE_BROADCAST},
+    };
+    return map;
+}
+
 const std::unordered_map<std::string, int32_t>& getAudioThreadTypeMap() {
     // DO NOT MODIFY VALUES (OK to add new ones).
     // This may be found in frameworks/av/services/audioflinger/Threads.h
@@ -197,6 +285,41 @@
     return map;
 }
 
+const std::unordered_map<std::string, int32_t>& getHeadTrackingModeMap() {
+    // DO NOT MODIFY VALUES(OK to add new ones).
+    // frameworks/base/media/java/android/media/Spatializer.java
+    // frameworks/av/media/libaudioclient/aidl/android/media/SpatializerHeadTrackingMode.aidl
+    static std::unordered_map<std::string, int32_t> map {
+        {"OTHER", 0},
+        {"DISABLED", -1},
+        {"RELATIVE_WORLD", 1},
+        {"RELATIVE_SCREEN", 2},
+    };
+    return map;
+}
+
+const std::unordered_map<std::string, int32_t>& getSpatializerLevelMap() {
+    // DO NOT MODIFY VALUES(OK to add new ones).
+    // frameworks/base/media/java/android/media/Spatializer.java
+    // frameworks/av/media/libaudioclient/aidl/android/media/SpatializerHeadTrackingMode.aidl
+    static std::unordered_map<std::string, int32_t> map {
+        {"NONE", 0},
+        {"SPATIALIZER_MULTICHANNEL", 1},
+        {"SPATIALIZER_MCHAN_BED_PLUS_OBJECTS", 2},
+    };
+    return map;
+}
+
+const std::unordered_map<std::string, int32_t>& getSpatializerModeMap() {
+    // DO NOT MODIFY VALUES(OK to add new ones).
+    // frameworks/av/media/libaudioclient/aidl/android/media/SpatializationMode.aidl
+    static std::unordered_map<std::string, int32_t> map {
+        {"SPATIALIZER_BINAURAL", 0},
+        {"SPATIALIZER_TRANSAURAL", 1},
+    };
+    return map;
+}
+
 const std::unordered_map<std::string, int32_t>& getStatusMap() {
     // DO NOT MODIFY VALUES(OK to add new ones).
     static std::unordered_map<std::string, int32_t> map {
@@ -286,6 +409,35 @@
     return value;
 }
 
+std::vector<int32_t> vectorFromMap(
+        const std::string &str, const std::unordered_map<std::string, int32_t>& map)
+{
+    std::vector<int32_t> v;
+
+    if (str.empty()) return v;
+
+    const auto result = stringutils::split(str, "|");
+    for (const auto &s : result) {
+        auto it = map.find(s);
+        if (it == map.end()) continue;
+        v.push_back(it->second);
+    }
+    return v;
+}
+
+std::vector<int64_t> channelMaskVectorFromString(const std::string &s)
+{
+    std::vector<int64_t> v;
+
+    const auto result = stringutils::split(s, "|");
+    for (const auto &mask : result) {
+        // 0 if undetected or if actually 0.
+        int64_t int64Mask = strtoll(mask.c_str(), nullptr, 0);
+        v.push_back(int64Mask);
+    }
+    return v;
+}
+
 template <>
 int32_t lookup<CONTENT_TYPE>(const std::string &contentType)
 {
@@ -441,6 +593,17 @@
 }
 
 template <>
+int32_t lookup<AUDIO_DEVICE_INFO_TYPE>(const std::string& audioDeviceInfoType)
+{
+    auto& map = getAudioDeviceInfoTypeMap();
+    auto it = map.find(audioDeviceInfoType);
+    if (it == map.end()) {
+        return 0;
+    }
+    return it->second;
+}
+
+template <>
 int32_t lookup<CALLER_NAME>(const std::string &callerName)
 {
     auto& map = getAudioCallerNameMap();
@@ -463,6 +626,39 @@
 }
 
 template <>
+int32_t lookup<HEAD_TRACKING_MODE>(const std::string& headTrackingMode)
+{
+    auto& map = getHeadTrackingModeMap();
+    auto it = map.find(headTrackingMode);
+    if (it == map.end()) {
+        return 0;
+    }
+    return it->second;
+}
+
+template <>
+int32_t lookup<SPATIALIZER_LEVEL>(const std::string& spatializerLevel)
+{
+    auto& map = getSpatializerLevelMap();
+    auto it = map.find(spatializerLevel);
+    if (it == map.end()) {
+        return 0;
+    }
+    return it->second;
+}
+
+template <>
+int32_t lookup<SPATIALIZER_MODE>(const std::string& spatializerMode)
+{
+    auto& map = getSpatializerModeMap();
+    auto it = map.find(spatializerMode);
+    if (it == map.end()) {
+        return 0;
+    }
+    return it->second;
+}
+
+template <>
 int32_t lookup<STATUS>(const std::string &status)
 {
     auto& map = getStatusMap();
diff --git a/services/mediametrics/MediaMetricsService.cpp b/services/mediametrics/MediaMetricsService.cpp
index 9e2f896..ceb3e6a 100644
--- a/services/mediametrics/MediaMetricsService.cpp
+++ b/services/mediametrics/MediaMetricsService.cpp
@@ -338,6 +338,15 @@
                 result << "-- some lines may be truncated --\n";
             }
 
+            const int32_t spatializerLinesToDump = all ? INT32_MAX : 15;
+            result << "\nSpatializer Message Log:";
+            const auto [ spatializerDumpString, spatializerLines ] =
+                    mAudioAnalytics.dumpSpatializer(spatializerLinesToDump);
+            result << "\n" << spatializerDumpString;
+            if (spatializerLines == spatializerLinesToDump) {
+                result << "-- some lines may be truncated --\n";
+            }
+
             result << "\nLogSessionId:\n"
                    << mediametrics::ValidateId::get()->dump();
 
diff --git a/services/mediametrics/include/mediametricsservice/AudioAnalytics.h b/services/mediametrics/include/mediametricsservice/AudioAnalytics.h
index 5ee8c30..7000ba8 100644
--- a/services/mediametrics/include/mediametricsservice/AudioAnalytics.h
+++ b/services/mediametrics/include/mediametricsservice/AudioAnalytics.h
@@ -92,6 +92,15 @@
         return mHealth.dump(lines);
     }
 
+    /**
+     * Returns a pair consisting of the dump string and the number of lines in the string.
+     *
+     * Spatializer dump.
+     */
+    std::pair<std::string, int32_t> dumpSpatializer(int32_t lines = INT32_MAX) const {
+        return mSpatializer.dump(lines);
+    }
+
     void clear() {
         // underlying state is locked.
         mPreviousAnalyticsState->clear();
@@ -317,6 +326,36 @@
         SimpleLog mSimpleLog GUARDED_BY(mLock) {64};
     } mHealth{*this};
 
+    // Spatializer is a nested class that tracks related messages.
+    class Spatializer {
+    public:
+        explicit Spatializer(AudioAnalytics &audioAnalytics)
+            : mAudioAnalytics(audioAnalytics) {}
+
+        // an item that starts with "audio.spatializer"
+        void onEvent(const std::shared_ptr<const android::mediametrics::Item> &item);
+
+        std::pair<std::string, int32_t> dump(
+                int32_t lines = INT32_MAX, const char *prefix = nullptr) const;
+
+    private:
+
+        // Current device state as strings:
+        // "" means unknown, "true" or "false".
+        struct DeviceState {
+            std::string enabled;
+            std::string hasHeadTracker;
+            std::string headTrackerEnabled;
+        };
+
+        AudioAnalytics& mAudioAnalytics;
+        static constexpr int64_t kBootDurationThreshold = 120 /* seconds */ * 1e9;
+        mutable std::mutex mLock;
+        int64_t mFirstCreateTimeNs GUARDED_BY(mLock) = 0;
+        std::map<std::string, DeviceState> mDeviceStateMap GUARDED_BY(mLock);
+        SimpleLog mSimpleLog GUARDED_BY(mLock) {64};
+    } mSpatializer{*this};
+
     AudioPowerUsage mAudioPowerUsage;
 };
 
diff --git a/services/mediametrics/include/mediametricsservice/AudioTypes.h b/services/mediametrics/include/mediametricsservice/AudioTypes.h
index 5dbff9b..b5fe28b 100644
--- a/services/mediametrics/include/mediametricsservice/AudioTypes.h
+++ b/services/mediametrics/include/mediametricsservice/AudioTypes.h
@@ -29,6 +29,14 @@
 const std::unordered_map<std::string, int64_t>& getAudioDeviceOutMap();
 const std::unordered_map<std::string, int32_t>& getAudioThreadTypeMap();
 const std::unordered_map<std::string, int32_t>& getAudioTrackTraitsMap();
+const std::unordered_map<std::string, int32_t>& getHeadTrackingModeMap();
+const std::unordered_map<std::string, int32_t>& getSpatializerLevelMap();
+const std::unordered_map<std::string, int32_t>& getSpatializerModeMap();
+
+std::vector<int32_t> vectorFromMap(
+        const std::string &str, const std::unordered_map<std::string, int32_t>& map);
+
+std::vector<int64_t> channelMaskVectorFromString(const std::string &s);
 
 // Enumeration for the device connection results.
 enum DeviceConnectionResult : int32_t {
@@ -47,14 +55,18 @@
     AAUDIO_DIRECTION,
     AAUDIO_PERFORMANCE_MODE,
     AAUDIO_SHARING_MODE,
+    AUDIO_DEVICE_INFO_TYPE,
     CALLER_NAME,
     CONTENT_TYPE,
     ENCODING,
+    HEAD_TRACKING_MODE,
     INPUT_DEVICE,  // int64_t
     INPUT_FLAG,
     OUTPUT_DEVICE, // int64_t
     OUTPUT_FLAG,
     SOURCE_TYPE,
+    SPATIALIZER_LEVEL,
+    SPATIALIZER_MODE,
     STATUS,
     STREAM_TYPE,
     THREAD_TYPE,
diff --git a/services/mediametrics/include/mediametricsservice/MediaMetricsService.h b/services/mediametrics/include/mediametricsservice/MediaMetricsService.h
index 8d0b1cf..3ec5ac7 100644
--- a/services/mediametrics/include/mediametricsservice/MediaMetricsService.h
+++ b/services/mediametrics/include/mediametricsservice/MediaMetricsService.h
@@ -125,7 +125,7 @@
     std::atomic<int64_t> mItemsSubmitted{}; // accessed outside of lock.
 
     // mStatsdLog is locked internally (thread-safe) and shows the last atoms logged
-    static constexpr size_t STATSD_LOG_LINES_MAX = 30; // recent log lines to keep
+    static constexpr size_t STATSD_LOG_LINES_MAX = 48; // recent log lines to keep
     static constexpr size_t STATSD_LOG_LINES_DUMP = 4; // normal amount of lines to dump
     const std::shared_ptr<mediametrics::StatsdLog> mStatsdLog{
             std::make_shared<mediametrics::StatsdLog>(STATSD_LOG_LINES_MAX)};
diff --git a/services/mediametrics/include/mediametricsservice/StringUtils.h b/services/mediametrics/include/mediametricsservice/StringUtils.h
index a56f5b8..a91d37b 100644
--- a/services/mediametrics/include/mediametricsservice/StringUtils.h
+++ b/services/mediametrics/include/mediametricsservice/StringUtils.h
@@ -23,6 +23,19 @@
 
 namespace android::mediametrics::stringutils {
 
+// Define a way of printing a vector - this
+// is used for proto repeated arguments.
+template <typename T>
+inline std::ostream & operator<< (std::ostream& s,
+                           std::vector<T> const& v) {
+    s << "{ ";
+    for (const auto& e : v) {
+        s << e << " ";
+    }
+    s << "}";
+    return s;
+}
+
 /**
  * fieldPrint is a helper method that logs to a stringstream a sequence of
  * field names (in a fixed size array) together with a variable number of arg parameters.