diff --git a/media/libheadtracking/Android.bp b/media/libheadtracking/Android.bp
index f64aedf..5bffb42 100644
--- a/media/libheadtracking/Android.bp
+++ b/media/libheadtracking/Android.bp
@@ -21,6 +21,7 @@
       "ScreenHeadFusion.cpp",
       "StillnessDetector.cpp",
       "Twist.cpp",
+      "VectorRecorder.cpp",
     ],
     shared_libs: [
         "libaudioutils",
@@ -35,6 +36,9 @@
     export_header_lib_headers: [
         "libeigen",
     ],
+    cflags: [
+        "-Wthread-safety",
+    ],
 }
 
 cc_library {
diff --git a/media/libheadtracking/VectorRecorder.cpp b/media/libheadtracking/VectorRecorder.cpp
new file mode 100644
index 0000000..5d0588e
--- /dev/null
+++ b/media/libheadtracking/VectorRecorder.cpp
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#include "media/VectorRecorder.h"
+
+namespace android::media {
+
+// Convert data to string with level indentation.
+// No need for a lock as the SimpleLog is thread-safe.
+std::string VectorRecorder::toString(size_t indent) const {
+    return mRecordLog.dumpToString(std::string(indent + 1, ' ').c_str(), mMaxLocalLogLine);
+}
+
+// Record into local log when it is time.
+void VectorRecorder::record(const std::vector<float>& record) {
+    if (record.size() != mVectorSize) return;
+
+    // Protect against concurrent calls to record().
+    std::lock_guard lg(mLock);
+
+    // if it is time, record average data and reset.
+    if (shouldRecordLog_l()) {
+        sumToAverage_l();
+        mRecordLog.log(
+                "mean: %s, min: %s, max %s, calculated %zu samples in %0.4f second(s)",
+                toString(mSum).c_str(),
+                toString(mMin).c_str(),
+                toString(mMax).c_str(),
+                mNumberOfSamples,
+                mNumberOfSecondsSinceFirstSample.count());
+        resetRecord_l();
+    }
+
+    // update stream average.
+    if (mNumberOfSamples++ == 0) {
+        mFirstSampleTimestamp = std::chrono::steady_clock::now();
+        for (size_t i = 0; i < mVectorSize; ++i) {
+            const float value = record[i];
+            mSum[i] += value;
+            mMax[i] = value;
+            mMin[i] = value;
+        }
+    } else {
+        for (size_t i = 0; i < mVectorSize; ++i) {
+            const float value = record[i];
+            mSum[i] += value;
+            mMax[i] = std::max(mMax[i], value);
+            mMin[i] = std::min(mMin[i], value);
+        }
+    }
+}
+
+bool VectorRecorder::shouldRecordLog_l() {
+    mNumberOfSecondsSinceFirstSample = std::chrono::duration_cast<std::chrono::seconds>(
+            std::chrono::steady_clock::now() - mFirstSampleTimestamp);
+    return mNumberOfSecondsSinceFirstSample >= mRecordThreshold;
+}
+
+void VectorRecorder::resetRecord_l() {
+    mSum.assign(mVectorSize, 0);
+    mMax.assign(mVectorSize, 0);
+    mMin.assign(mVectorSize, 0);
+    mNumberOfSamples = 0;
+    mNumberOfSecondsSinceFirstSample = std::chrono::seconds(0);
+}
+
+void VectorRecorder::sumToAverage_l() {
+    if (mNumberOfSamples == 0) return;
+    const float reciprocal = 1.f / mNumberOfSamples;
+    for (auto& p : mSum) {
+        p *= reciprocal;
+    }
+}
+
+}  // namespace android::media
diff --git a/media/libheadtracking/include/media/VectorRecorder.h b/media/libheadtracking/include/media/VectorRecorder.h
new file mode 100644
index 0000000..1fb7521
--- /dev/null
+++ b/media/libheadtracking/include/media/VectorRecorder.h
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2023 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 <android-base/stringprintf.h>
+#include <android-base/thread_annotations.h>
+#include <audio_utils/SimpleLog.h>
+#include <chrono>
+#include <math.h>
+#include <mutex>
+#include <vector>
+
+namespace android::media {
+
+/**
+ * VectorRecorder records a vector of floats computing the average, max, and min
+ * over given time periods.
+ *
+ * The class is thread-safe.
+ */
+class VectorRecorder {
+  public:
+    VectorRecorder(
+        size_t vectorSize, std::chrono::duration<double> threshold, int maxLogLine)
+        : mVectorSize(vectorSize)
+        , mRecordLog(maxLogLine)
+        , mRecordThreshold(threshold)
+    {
+        resetRecord_l();  // OK to call - we're in the constructor.
+    }
+
+    /** Convert recorded vector data to string with level indentation */
+    std::string toString(size_t indent) const;
+
+    /**
+     * @brief Record a vector of floats.
+     *
+     * @param record a vector of floats.
+     */
+    void record(const std::vector<float>& record);
+
+    /**
+     * Format vector to a string, [0.00, 0.00, 0.00, -1.29, -0.50, 15.27].
+     */
+    template <typename T>
+    static std::string toString(const std::vector<T>& record) {
+        if (record.size() == 0) {
+            return "[]";
+        }
+
+        std::string ss = "[";
+        for (size_t i = 0; i < record.size(); ++i) {
+            if (i > 0) {
+                ss.append(", ");
+            }
+            base::StringAppendF(&ss, "%0.2lf", static_cast<double>(record[i]));
+        }
+        ss.append("]");
+        return ss;
+    }
+
+  private:
+    static constexpr int mMaxLocalLogLine = 10;
+
+    const size_t mVectorSize;
+
+    // Local log for historical vector data.
+    // Locked internally, so does not need mutex below.
+    SimpleLog mRecordLog{mMaxLocalLogLine};
+
+    std::mutex mLock;
+
+    // Time threshold to record vectors in the local log.
+    // Vector data will be recorded into log at least every mRecordThreshold.
+    std::chrono::duration<double> mRecordThreshold GUARDED_BY(mLock);
+
+    // Number of seconds since first sample in mSum.
+    std::chrono::duration<double> mNumberOfSecondsSinceFirstSample GUARDED_BY(mLock);
+
+    // Timestamp of first sample recorded in mSum.
+    std::chrono::time_point<std::chrono::steady_clock> mFirstSampleTimestamp GUARDED_BY(mLock);
+
+    // Number of samples in mSum.
+    size_t mNumberOfSamples GUARDED_BY(mLock) = 0;
+
+    std::vector<double> mSum GUARDED_BY(mLock);
+    std::vector<float> mMax GUARDED_BY(mLock);
+    std::vector<float> mMin GUARDED_BY(mLock);
+
+    // Computes mNumberOfSecondsSinceFirstSample, returns true if time to record.
+    bool shouldRecordLog_l() REQUIRES(mLock);
+
+    // Resets the running mNumberOfSamples, mSum, mMax, mMin.
+    void resetRecord_l() REQUIRES(mLock);
+
+    // Convert mSum to an average.
+    void sumToAverage_l() REQUIRES(mLock);
+};  // VectorRecorder
+
+}  // namespace android::media