Revert of Implement the NackModule as part of the new jitter buffer.

webrtc/base/mod_ops.h

-/*
- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_BASE_MOD_OPS_H_
-#define WEBRTC_BASE_MOD_OPS_H_
-
-#include <limits>
-#include <type_traits>
-
-#include "webrtc/base/checks.h"
-
-#define MOD_OPS_ASSERT_TYPE_IS_UNSIGNED(T)              \
-  static_assert(std::numeric_limits<T>::is_integer &&   \
-                    !std::numeric_limits<T>::is_signed, \
-                "Type must be of unsigned integer.")
-
-namespace webrtc {
-
-template <unsigned long M>                                    // NOLINT
-inline unsigned long Add(unsigned long a, unsigned long b) {  // NOLINT
-  RTC_DCHECK_LT(a, M);
-  unsigned long t = M - b % M;  // NOLINT
-  unsigned long res = a - t;    // NOLINT
-  if (t > a)
-    return res + M;
-  return res;
-}
-
-template <unsigned long M>                                         // NOLINT
-inline unsigned long Subtract(unsigned long a, unsigned long b) {  // NOLINT
-  RTC_DCHECK_LT(a, M);
-  unsigned long sub = b % M;  // NOLINT
-  if (a < sub)
-    return M - (sub - a);
-  return a - sub;
-}
-
-// Calculates the forward difference between two numbers.
-//
-// Example:
-// uint8_t x = 253;
-// uint8_t y = 2;
-//
-// ForwardDiff(x, y) == 4
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-//          |----->----->----->----->----->
-//
-// ForwardDiff(y, x) == 251
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-// -->----->                              |----->---
-//
-template <typename T>
-inline T ForwardDiff(T a, T b) {
-  MOD_OPS_ASSERT_TYPE_IS_UNSIGNED(T);
-  return b - a;
-}
-
-// Calculates the reverse difference between two numbers.
-//
-// Example:
-// uint8_t x = 253;
-// uint8_t y = 2;
-//
-// ReverseDiff(y, x) == 5
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-//          <-----<-----<-----<-----<-----|
-//
-// ReverseDiff(x, y) == 251
-//
-//   252   253   254   255    0     1     2     3
-// #################################################
-// |     |  x  |     |     |     |     |  y  |     |
-// #################################################
-// ---<-----|                             |<-----<--
-//
-template <typename T>
-inline T ReverseDiff(T a, T b) {
-  MOD_OPS_ASSERT_TYPE_IS_UNSIGNED(T);
-  return a - b;
-}
-
-// Test if the sequence number a is ahead or at sequence number b.
-// If the two sequence numbers are at max distance from each other
-// then the sequence number with highest value is considered to
-// be ahead.
-template <typename T>
-inline bool AheadOrAt(T a, T b) {
-  MOD_OPS_ASSERT_TYPE_IS_UNSIGNED(T);
-  const T maxDist = std::numeric_limits<T>::max() / 2 + T(1);
-  if (a - b == maxDist)
-    return b < a;
-  return ForwardDiff(b, a) < maxDist;
-}
-
-// Test if sequence number a is ahead of sequence number b.
-template <typename T>
-inline bool AheadOf(T a, T b) {
-  MOD_OPS_ASSERT_TYPE_IS_UNSIGNED(T);
-  return a != b && AheadOrAt(a, b);
-}
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_BASE_MOD_OPS_H_