diff --git a/include/media/AudioRecord.h b/include/media/AudioRecord.h
index c47a4e7..521557d 100644
--- a/include/media/AudioRecord.h
+++ b/include/media/AudioRecord.h
@@ -19,6 +19,7 @@
 
 #include <cutils/sched_policy.h>
 #include <media/AudioSystem.h>
+#include <media/AudioTimestamp.h>
 #include <media/IAudioRecord.h>
 #include <media/Modulo.h>
 #include <utils/threads.h>
@@ -314,6 +315,17 @@
      */
             status_t    getPosition(uint32_t *position) const;
 
+    /* Return the record timestamp.
+     *
+     * Parameters:
+     *  timestamp: A pointer to the timestamp to be filled.
+     *
+     * Returned status (from utils/Errors.h) can be:
+     *  - NO_ERROR: successful operation
+     *  - BAD_VALUE: timestamp is NULL
+     */
+            status_t getTimestamp(ExtendedTimestamp *timestamp);
+
     /* Returns a handle on the audio input used by this AudioRecord.
      *
      * Parameters:
@@ -571,6 +583,11 @@
     size_t                  mReqFrameCount;         // frame count to request the first or next time
                                                     // a new IAudioRecord is needed, non-decreasing
 
+    int64_t                 mFramesRead;            // total frames read. reset to zero after
+                                                    // the start() following stop(). It is not
+                                                    // changed after restoring the track.
+    int64_t                 mFramesReadServerOffset; // An offset to server frames read due to
+                                                    // restoring AudioRecord, or stop/start.
     // constant after constructor or set()
     uint32_t                mSampleRate;
     audio_format_t          mFormat;
diff --git a/include/media/AudioTimestamp.h b/include/media/AudioTimestamp.h
index 99e9c3e..e6ca225 100644
--- a/include/media/AudioTimestamp.h
+++ b/include/media/AudioTimestamp.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_AUDIO_TIMESTAMP_H
 #define ANDROID_AUDIO_TIMESTAMP_H
 
+#include <string>
+#include <sstream>
 #include <time.h>
 
 namespace android {
@@ -32,6 +34,85 @@
     struct timespec mTime;     // corresponding CLOCK_MONOTONIC when frame is expected to present
 };
 
+struct ExtendedTimestamp {
+    enum Location {
+        LOCATION_CLIENT,   // timestamp of last read frame from client-server track buffer
+        LOCATION_SERVER,   // timestamp of newest frame from client-server track buffer
+        LOCATION_KERNEL,   // timestamp of newest frame in the kernel (alsa) buffer.
+        LOCATION_MAX       // for sizing arrays only
+    };
+
+    // This needs to be kept in sync with android.media.AudioTimestamp
+    enum Timebase {
+        TIMEBASE_MONOTONIC,  // Clock monotonic offset (generally 0)
+        TIMEBASE_BOOTTIME,
+        TIMEBASE_MAX,
+    };
+
+    ExtendedTimestamp() {
+        clear();
+    }
+
+    // mPosition is expressed in frame units.
+    // It is generally nonnegative, though we keep this signed for
+    // to potentially express algorithmic latency at the start of the stream
+    // and to prevent unintentional unsigned integer underflow.
+    int64_t mPosition[LOCATION_MAX];
+
+    // mTimeNs is in nanoseconds for the default timebase, monotonic.
+    // If this value is -1, then both time and position are invalid.
+    // If this value is 0, then the time is not valid but the position is valid.
+    int64_t mTimeNs[LOCATION_MAX];
+
+    // mTimebaseOffset is the offset in ns from monotonic when the
+    // timestamp was taken.  This may vary due to suspend time
+    // or NTP adjustment.
+    int64_t mTimebaseOffset[TIMEBASE_MAX];
+
+    void clear() {
+        memset(mPosition, 0, sizeof(mPosition)); // actually not necessary if time is -1
+        for (int i = 0; i < LOCATION_MAX; ++i) {
+            mTimeNs[i] = -1;
+        }
+        memset(mTimebaseOffset, 0, sizeof(mTimebaseOffset));
+    }
+
+    // Returns the best timestamp as judged from the closest-to-hw stage in the
+    // pipeline with a valid timestamp.
+    int getBestTimestamp(int64_t *position, int64_t *time, int timebase) {
+        if (position == nullptr || time == nullptr
+                || timebase < 0 || timebase >= TIMEBASE_MAX) {
+            return BAD_VALUE;
+        }
+        // look for the closest-to-hw stage in the pipeline with a valid timestamp.
+        // We omit LOCATION_CLIENT as we prefer at least LOCATION_SERVER based accuracy
+        // when getting the best timestamp.
+        for (int i = LOCATION_MAX - 1; i >= LOCATION_SERVER; --i) {
+            if (mTimeNs[i] > 0) {
+                *position = mPosition[i];
+                *time = mTimeNs[i] + mTimebaseOffset[timebase];
+                return OK;
+            }
+        }
+        return INVALID_OPERATION;
+    }
+
+    // convert fields to a printable string
+    std::string toString() {
+        std::stringstream ss;
+
+        ss << "BOOTTIME offset " << mTimebaseOffset[TIMEBASE_BOOTTIME] << "\n";
+        for (int i = 0; i < LOCATION_MAX; ++i) {
+            ss << "ExtendedTimestamp[" << i << "]  position: "
+                    << mPosition[i] << "  time: "  << mTimeNs[i] << "\n";
+        }
+        return ss.str();
+    }
+    // TODO:
+    // Consider adding buffer status:
+    // size, available, algorithmic latency
+};
+
 }   // namespace
 
 #endif  // ANDROID_AUDIO_TIMESTAMP_H
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index 770f007..2270c85 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -26,6 +26,7 @@
 #include <utils/RefBase.h>
 #include <audio_utils/roundup.h>
 #include <media/AudioResamplerPublic.h>
+#include <media/AudioTimestamp.h>
 #include <media/Modulo.h>
 #include <media/SingleStateQueue.h>
 
@@ -118,6 +119,8 @@
 
 typedef SingleStateQueue<AudioPlaybackRate> PlaybackRateQueue;
 
+typedef SingleStateQueue<ExtendedTimestamp> ExtendedTimestampQueue;
+
 // ----------------------------------------------------------------------------
 
 // Important: do not add any virtual methods, including ~
@@ -171,6 +174,8 @@
 
                 uint16_t    mPad2;           // unused
 
+                // server write-only, client read
+                ExtendedTimestampQueue::Shared mExtendedTimestampQueue;
 public:
 
     volatile    int32_t     mFlags;         // combinations of CBLK_*
@@ -426,8 +431,39 @@
     AudioRecordClientProxy(audio_track_cblk_t* cblk, void *buffers, size_t frameCount,
             size_t frameSize)
         : ClientProxy(cblk, buffers, frameCount, frameSize,
-            false /*isOut*/, false /*clientInServer*/) { }
+            false /*isOut*/, false /*clientInServer*/)
+        , mTimestampObserver(&cblk->mExtendedTimestampQueue) { }
     ~AudioRecordClientProxy() { }
+
+    status_t    getTimestamp(ExtendedTimestamp *timestamp) {
+        if (timestamp == nullptr) {
+            return BAD_VALUE;
+        }
+        (void) mTimestampObserver.poll(mTimestamp);
+        *timestamp = mTimestamp;
+        return OK;
+    }
+
+    void        clearTimestamp() {
+        mTimestamp.clear();
+    }
+
+    // Advances the client read pointer to the server write head pointer
+    // effectively flushing the client read buffer. The effect is
+    // instantaneous. Returns the number of frames flushed.
+    uint32_t    flush() {
+        int32_t rear = android_atomic_acquire_load(&mCblk->u.mStreaming.mRear);
+        int32_t front = mCblk->u.mStreaming.mFront;
+        android_atomic_release_store(rear, &mCblk->u.mStreaming.mFront);
+        return (Modulo<int32_t>(rear) - front).unsignedValue();
+    }
+
+private:
+    // The shared buffer contents referred to by the timestamp observer
+    // is initialized when the server proxy created.  A local zero timestamp
+    // is initialized by the client constructor.
+    ExtendedTimestampQueue::Observer mTimestampObserver;
+    ExtendedTimestamp mTimestamp; // initialized by constructor
 };
 
 // ----------------------------------------------------------------------------
@@ -476,6 +512,7 @@
 protected:
     size_t      mAvailToClient; // estimated frames available to client prior to releaseBuffer()
     int32_t     mFlush;         // our copy of cblk->u.mStreaming.mFlush, for streaming output only
+    int64_t     mReleased;      // our copy of cblk->mServer, at 64 bit resolution
 };
 
 // Proxy used by AudioFlinger for servicing AudioTrack
@@ -520,7 +557,7 @@
     virtual uint32_t    getUnderrunFrames() const { return mCblk->u.mStreaming.mUnderrunFrames; }
 
     // Return the total number of frames that AudioFlinger has obtained and released
-    virtual size_t      framesReleased() const { return mCblk->mServer; }
+    virtual size_t      framesReleased() const { return mReleased; }
 
     // Return the playback speed and pitch read atomically. Not multi-thread safe on server side.
     AudioPlaybackRate getPlaybackRate();
@@ -574,9 +611,20 @@
 public:
     AudioRecordServerProxy(audio_track_cblk_t* cblk, void *buffers, size_t frameCount,
             size_t frameSize, bool clientInServer)
-        : ServerProxy(cblk, buffers, frameCount, frameSize, false /*isOut*/, clientInServer) { }
+        : ServerProxy(cblk, buffers, frameCount, frameSize, false /*isOut*/, clientInServer)
+        , mTimestampMutator(&cblk->mExtendedTimestampQueue) { }
+
+    // Return the total number of frames that AudioFlinger has obtained and released
+    virtual int64_t     framesReleased() const { return mReleased; }
+
+    // Expose timestamp to client proxy. Should only be called by a single thread.
+    virtual void        setExtendedTimestamp(const ExtendedTimestamp &timestamp) {
+                            mTimestampMutator.push(timestamp);
+                        }
 protected:
     virtual ~AudioRecordServerProxy() { }
+
+    ExtendedTimestampQueue::Mutator       mTimestampMutator;
 };
 
 // ----------------------------------------------------------------------------