diff --git a/rtc_base/numerics/sequence_number_util.h b/rtc_base/numerics/sequence_number_util.h
index 96a4974ec5..5b4ad10e94 100644
--- a/rtc_base/numerics/sequence_number_util.h
+++ b/rtc_base/numerics/sequence_number_util.h
@@ -109,6 +109,28 @@ class SeqNumUnwrapper {
     return last_unwrapped_;
   }
 
+  int64_t UnwrapForward(T value) {
+    if (!last_value_) {
+      last_unwrapped_ = {value};
+    } else {
+      last_unwrapped_ += ForwardDiff<T, M>(*last_value_, value);
+    }
+
+    last_value_ = value;
+    return last_unwrapped_;
+  }
+
+  int64_t UnwrapBackwards(T value) {
+    if (!last_value_) {
+      last_unwrapped_ = {value};
+    } else {
+      last_unwrapped_ -= ReverseDiff<T, M>(*last_value_, value);
+    }
+
+    last_value_ = value;
+    return last_unwrapped_;
+  }
+
  private:
   int64_t last_unwrapped_ = 0;
   absl::optional<T> last_value_;
diff --git a/rtc_base/numerics/sequence_number_util_unittest.cc b/rtc_base/numerics/sequence_number_util_unittest.cc
index d7fa0b1467..c353c921fa 100644
--- a/rtc_base/numerics/sequence_number_util_unittest.cc
+++ b/rtc_base/numerics/sequence_number_util_unittest.cc
@@ -303,4 +303,32 @@ TEST(SeqNumUnwrapper, ManyBackwardWraps) {
   }
 }
 
+TEST(SeqNumUnwrapper, UnwrapForward) {
+  SeqNumUnwrapper<uint8_t> unwrapper;
+  EXPECT_EQ(255, unwrapper.Unwrap(255));
+  EXPECT_EQ(256, unwrapper.UnwrapForward(0));
+  EXPECT_EQ(511, unwrapper.UnwrapForward(255));
+}
+
+TEST(SeqNumUnwrapper, UnwrapForwardWithDivisor) {
+  SeqNumUnwrapper<uint8_t, 33> unwrapper;
+  EXPECT_EQ(30, unwrapper.UnwrapForward(30));
+  EXPECT_EQ(36, unwrapper.UnwrapForward(3));
+  EXPECT_EQ(63, unwrapper.UnwrapForward(30));
+}
+
+TEST(SeqNumUnwrapper, UnwrapBackwards) {
+  SeqNumUnwrapper<uint8_t> unwrapper;
+  EXPECT_EQ(0, unwrapper.UnwrapBackwards(0));
+  EXPECT_EQ(-2, unwrapper.UnwrapBackwards(254));
+  EXPECT_EQ(-256, unwrapper.UnwrapBackwards(0));
+}
+
+TEST(SeqNumUnwrapper, UnwrapBackwardsWithDivisor) {
+  SeqNumUnwrapper<uint8_t, 33> unwrapper;
+  EXPECT_EQ(0, unwrapper.Unwrap(0));
+  EXPECT_EQ(-2, unwrapper.UnwrapBackwards(31));
+  EXPECT_EQ(-33, unwrapper.UnwrapBackwards(0));
+}
+
 }  // namespace webrtc