diff --git a/media/libaudioclient/AudioTrackShared.cpp b/media/libaudioclient/AudioTrackShared.cpp
index c997cfa..ee6c335 100644
--- a/media/libaudioclient/AudioTrackShared.cpp
+++ b/media/libaudioclient/AudioTrackShared.cpp
@@ -20,30 +20,13 @@
 #include <android-base/macros.h>
 #include <private/media/AudioTrackShared.h>
 #include <utils/Log.h>
+#include <audio_utils/safe_math.h>
 
 #include <linux/futex.h>
 #include <sys/syscall.h>
 
 namespace android {
 
-// TODO: consider pulling this into a shared header.
-// safe_sub_overflow is used ensure that subtraction occurs in the same native type
-// with proper 2's complement overflow.  Without calling this function, it is possible,
-// for example, that optimizing compilers may elect to treat 32 bit subtraction
-// as 64 bit subtraction when storing into a 64 bit destination as integer overflow is
-// technically undefined.
-template<typename T,
-         typename U,
-         typename = std::enable_if_t<std::is_same<std::decay_t<T>,
-                                       std::decay_t<U>>{}>>
-         // ensure arguments are same type (ignoring volatile, which is used in cblk variables).
-auto safe_sub_overflow(const T& a, const U& b) {
-    std::decay_t<T> result;
-    (void)__builtin_sub_overflow(a, b, &result);
-    // note if __builtin_sub_overflow returns true, an overflow occurred.
-    return result;
-}
-
 // used to clamp a value to size_t.  TODO: move to another file.
 template <typename T>
 size_t clampToSize(T x) {
@@ -204,7 +187,7 @@
             front = cblk->u.mStreaming.mFront;
         }
         // write to rear, read from front
-        ssize_t filled = safe_sub_overflow(rear, front);
+        ssize_t filled = audio_utils::safe_sub_overflow(rear, front);
         // pipe should not be overfull
         if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
             if (mIsOut) {
@@ -702,7 +685,7 @@
         const size_t overflowBit = mFrameCountP2 << 1;
         const size_t mask = overflowBit - 1;
         int32_t newFront = (front & ~mask) | (flush & mask);
-        ssize_t filled = safe_sub_overflow(rear, newFront);
+        ssize_t filled = audio_utils::safe_sub_overflow(rear, newFront);
         if (filled >= (ssize_t)overflowBit) {
             // front and rear offsets span the overflow bit of the p2 mask
             // so rebasing newFront on the front offset is off by the overflow bit.
@@ -744,7 +727,7 @@
         const size_t overflowBit = mFrameCountP2 << 1;
         const size_t mask = overflowBit - 1;
         int32_t newRear = (rear & ~mask) | (stop & mask);
-        ssize_t filled = safe_sub_overflow(newRear, front);
+        ssize_t filled = audio_utils::safe_sub_overflow(newRear, front);
         // overflowBit is unsigned, so cast to signed for comparison.
         if (filled >= (ssize_t)overflowBit) {
             // front and rear offsets span the overflow bit of the p2 mask
@@ -796,7 +779,7 @@
         front = android_atomic_acquire_load(&cblk->u.mStreaming.mFront);
         rear = cblk->u.mStreaming.mRear;
     }
-    ssize_t filled = safe_sub_overflow(rear, front);
+    ssize_t filled = audio_utils::safe_sub_overflow(rear, front);
     // pipe should not already be overfull
     if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
         ALOGE("Shared memory control block is corrupt (filled=%zd, mFrameCount=%zu); shutting down",
@@ -923,7 +906,7 @@
         return mFrameCount;
     }
     const int32_t rear = getRear();
-    ssize_t filled = safe_sub_overflow(rear, cblk->u.mStreaming.mFront);
+    ssize_t filled = audio_utils::safe_sub_overflow(rear, cblk->u.mStreaming.mFront);
     // pipe should not already be overfull
     if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
         ALOGE("Shared memory control block is corrupt (filled=%zd, mFrameCount=%zu); shutting down",
@@ -949,7 +932,7 @@
         return mFrameCount;
     }
     const int32_t rear = getRear();
-    const ssize_t filled = safe_sub_overflow(rear, cblk->u.mStreaming.mFront);
+    const ssize_t filled = audio_utils::safe_sub_overflow(rear, cblk->u.mStreaming.mFront);
     if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
         return 0; // error condition, silently return 0.
     }
@@ -1259,7 +1242,7 @@
     }
     const int32_t front = android_atomic_acquire_load(&mCblk->u.mStreaming.mFront);
     const int32_t rear = mCblk->u.mStreaming.mRear;
-    const ssize_t filled = safe_sub_overflow(rear, front);
+    const ssize_t filled = audio_utils::safe_sub_overflow(rear, front);
     if (!(0 <= filled && (size_t) filled <= mFrameCount)) {
         return 0; // error condition, silently return 0.
     }