Generalize FEC unit tests and rename GenerateFec. (pt. 3)

webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
 #include <algorithm>
 #include <list>
+#include <memory>
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/basictypes.h"
 #include "webrtc/base/random.h"
 #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
+#include "webrtc/modules/rtp_rtcp/source/fec_test_helper.h"
 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h"
 
-using webrtc::ForwardErrorCorrection;
+namespace webrtc {
 
-// Minimum RTP header size in bytes.
-constexpr uint8_t kRtpHeaderSize = 12;
+namespace {
 
 // Transport header size in bytes. Assume UDP/IPv4 as a reasonable minimum.
-constexpr uint8_t kTransportOverhead = 28;
+constexpr size_t kTransportOverhead = 28;
 
-// Maximum number of media packets used in the FEC (RFC 5109).
-constexpr uint8_t kMaxNumberMediaPackets =
-    ForwardErrorCorrection::kMaxMediaPackets;
+constexpr uint32_t kMediaSsrc = 83542;
 
-using PacketList = ForwardErrorCorrection::PacketList;
-using ReceivedPacketList = ForwardErrorCorrection::ReceivedPacketList;
-using RecoveredPacketList = ForwardErrorCorrection::RecoveredPacketList;
+// Deep copies |src| to |dst|, but only keeps every Nth packet.
+void DeepCopyEveryNthPacket(const ForwardErrorCorrection::PacketList& src,
+                            int n,
+                            ForwardErrorCorrection::PacketList* dst) {
+  RTC_DCHECK_GT(n, 0);
+  int i = 0;
+  for (const auto& packet : src) {
+    if (i % n == 0) {
+      dst->emplace_back(new ForwardErrorCorrection::Packet(*packet));
+    }
+    ++i;
+  }
+}
 
+}  // namespace
+
+using ::testing::Types;
+
+template <typename ForwardErrorCorrectionType>
 class RtpFecTest : public ::testing::Test {
  protected:
   RtpFecTest()
-      : random_(0xfec133700742),
-        ssrc_(random_.Rand<uint32_t>()),
-        fec_seq_num_(0) {}
+      : random_(0xabcdef123456),
+        media_packet_generator_(
+            kRtpHeaderSize,  // Minimum packet size.
+            IP_PACKET_SIZE - kRtpHeaderSize - kTransportOverhead -
+                fec_.MaxPacketOverhead(),  // Maximum packet size.
+            kMediaSsrc,
+            &random_) {}
 
-  // Construct the media packet list, up to |num_media_packets| packets.
-  // Returns the next sequence number after the last media packet.
-  // (this will be the sequence of the first FEC packet)
-  int ConstructMediaPacketsSeqNum(int num_media_packets, int start_seq_num);
-  int ConstructMediaPackets(int num_media_packets);
-
-  // Deep copies |src| to |dst|, but only keeps every Nth packet.
-  void DeepCopyEveryNthPacket(const PacketList& src, int n, PacketList* dst);
-
-  // Construct |received_packet_list_|: a subset of the media and FEC packets.
+  // Construct |received_packets_|: a subset of the media and FEC packets.
   //
   // Media packet "i" is lost if media_loss_mask_[i] = 1, received if
   // media_loss_mask_[i] = 0.
   // FEC packet "i" is lost if fec_loss_mask_[i] = 1, received if
   // fec_loss_mask_[i] = 0.
   void NetworkReceivedPackets(int* media_loss_mask, int* fec_loss_mask);
 
   // Add packet from |packet_list| to list of received packets, using the
   // |loss_mask|.
   // The |packet_list| may be a media packet list (is_fec = false), or a
   // FEC packet list (is_fec = true).
   template <typename T>
   void ReceivedPackets(const T& packet_list, int* loss_mask, bool is_fec);
 
   // Check for complete recovery after FEC decoding.
   bool IsRecoveryComplete();
 
-  // Delete the media and FEC packets.
-  void TearDown();
+  ForwardErrorCorrectionType fec_;
 
-  webrtc::Random random_;
-  ForwardErrorCorrection fec_;
-  int ssrc_;
-  uint16_t fec_seq_num_;
+  Random random_;
+  test::fec::MediaPacketGenerator media_packet_generator_;
 
-  PacketList media_packet_list_;
-  std::list<ForwardErrorCorrection::Packet*> fec_packet_list_;
-  ReceivedPacketList received_packet_list_;
-  RecoveredPacketList recovered_packet_list_;
+  ForwardErrorCorrection::PacketList media_packets_;
+  std::list<ForwardErrorCorrection::Packet*> generated_fec_packets_;
+  ForwardErrorCorrection::ReceivedPacketList received_packets_;
+  ForwardErrorCorrection::RecoveredPacketList recovered_packets_;
 
-  int media_loss_mask_[kMaxNumberMediaPackets];
-  int fec_loss_mask_[kMaxNumberMediaPackets];
+  int media_loss_mask_[ForwardErrorCorrection::kMaxMediaPackets];
+  int fec_loss_mask_[ForwardErrorCorrection::kMaxMediaPackets];
 };
 
-TEST_F(RtpFecTest, FecRecoveryNoLoss) {
+// Define gTest typed test to loop over both ULPFEC and FlexFEC.
+// Since the tests now are parameterized, we need to access
+// member variables using |this|, thereby enforcing runtime
+// resolution.
+using FecTypes = Types<ForwardErrorCorrection>;
+TYPED_TEST_CASE(RtpFecTest, FecTypes);
+
+TYPED_TEST(RtpFecTest, FecRecoveryNoLoss) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 60;
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // No packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // No packets lost, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
+  EXPECT_TRUE(this->IsRecoveryComplete());
 }
 
-TEST_F(RtpFecTest, FecRecoveryWithLoss) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithLoss) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 60;
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // 1 media packet lost
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // One packet lost, one FEC packet, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 2 media packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // 2 packets lost, one FEC packet, cannot get complete recovery.
-  EXPECT_FALSE(IsRecoveryComplete());
+  EXPECT_FALSE(this->IsRecoveryComplete());
 }
 
 // Verify that we don't use an old FEC packet for FEC decoding.
-TEST_F(RtpFecTest, FecRecoveryWithSeqNumGapTwoFrames) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithSeqNumGapTwoFrames) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr uint8_t kProtectionFactor = 20;
 
   // Two frames: first frame (old) with two media packets and 1 FEC packet.
   // Second frame (new) with 3 media packets, and no FEC packets.
   //       ---Frame 1----                     ----Frame 2------
   //  #0(media) #1(media) #2(FEC)     #65535(media) #0(media) #1(media).
   // If we lose either packet 0 or 1 of second frame, FEC decoding should not
   // try to decode using "old" FEC packet #2.
 
   // Construct media packets for first frame, starting at sequence number 0.
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(2, 0);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(2, 0);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
   // Add FEC packet (seq#2) of this first frame to received list (i.e., assume
   // the two media packet were lost).
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  ReceivedPackets(fec_packet_list_, fec_loss_mask_, true);
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->ReceivedPackets(this->generated_fec_packets_, this->fec_loss_mask_,
+                        true);
 
   // Construct media packets for second frame, with sequence number wrap.
-  media_packet_list_.clear();
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(3, 65535);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(3, 65535);
 
   // Expect 3 media packets for this frame.
-  EXPECT_EQ(3u, media_packet_list_.size());
+  EXPECT_EQ(3u, this->media_packets_.size());
 
   // Second media packet lost (seq#0).
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  media_loss_mask_[1] = 1;
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  this->media_loss_mask_[1] = 1;
   // Add packets #65535, and #1 to received list.
-  ReceivedPackets(media_packet_list_, media_loss_mask_, false);
+  this->ReceivedPackets(this->media_packets_, this->media_loss_mask_, false);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Expect that no decoding is done to get missing packet (seq#0) of second
   // frame, using old FEC packet (seq#2) from first (old) frame. So number of
   // recovered packets is 2, and not equal to number of media packets (=3).
-  EXPECT_EQ(2u, recovered_packet_list_.size());
-  EXPECT_TRUE(recovered_packet_list_.size() != media_packet_list_.size());
+  EXPECT_EQ(2u, this->recovered_packets_.size());
+  EXPECT_TRUE(this->recovered_packets_.size() != this->media_packets_.size());
 }
 
 // Verify we can still recover frame if sequence number wrap occurs within
 // the frame and FEC packet following wrap is received after media packets.
-TEST_F(RtpFecTest, FecRecoveryWithSeqNumGapOneFrameRecovery) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithSeqNumGapOneFrameRecovery) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr uint8_t kProtectionFactor = 20;
 
   // One frame, with sequence number wrap in media packets.
   //         -----Frame 1----
   //  #65534(media) #65535(media) #0(media) #1(FEC).
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(3, 65534);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(3, 65534);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // Lose one media packet (seq# 65535).
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
-  ReceivedPackets(media_packet_list_, media_loss_mask_, false);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
+  this->ReceivedPackets(this->media_packets_, this->media_loss_mask_, false);
   // Add FEC packet to received list following the media packets.
-  ReceivedPackets(fec_packet_list_, fec_loss_mask_, true);
+  this->ReceivedPackets(this->generated_fec_packets_, this->fec_loss_mask_,
+                        true);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Expect 3 media packets in recovered list, and complete recovery.
   // Wrap-around won't remove FEC packet, as it follows the wrap.
-  EXPECT_EQ(3u, recovered_packet_list_.size());
-  EXPECT_TRUE(IsRecoveryComplete());
+  EXPECT_EQ(3u, this->recovered_packets_.size());
+  EXPECT_TRUE(this->IsRecoveryComplete());
 }
 
 // Sequence number wrap occurs within the FEC packets for the frame.
 // In this case we will discard FEC packet and full recovery is not expected.
 // Same problem will occur if wrap is within media packets but FEC packet is
 // received before the media packets. This may be improved if timing information
 // is used to detect old FEC packets.
 // TODO(marpan): Update test if wrap-around handling changes in FEC decoding.
-TEST_F(RtpFecTest, FecRecoveryWithSeqNumGapOneFrameNoRecovery) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithSeqNumGapOneFrameNoRecovery) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr uint8_t kProtectionFactor = 200;
 
   // 1 frame: 3 media packets and 2 FEC packets.
   // Sequence number wrap in FEC packets.
   //           -----Frame 1----
   // #65532(media) #65533(media) #65534(media) #65535(FEC) #0(FEC).
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(3, 65532);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(3, 65532);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 2 FEC packets.
-  EXPECT_EQ(2u, fec_packet_list_.size());
+  EXPECT_EQ(2u, this->generated_fec_packets_.size());
 
   // Lose the last two media packets (seq# 65533, 65534).
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[2] = 1;
-  ReceivedPackets(media_packet_list_, media_loss_mask_, false);
-  ReceivedPackets(fec_packet_list_, fec_loss_mask_, true);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->ReceivedPackets(this->media_packets_, this->media_loss_mask_, false);
+  this->ReceivedPackets(this->generated_fec_packets_, this->fec_loss_mask_,
+                        true);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // The two FEC packets are received and should allow for complete recovery,
   // but because of the wrap the second FEC packet will be discarded, and only
   // one media packet is recoverable. So exepct 2 media packets on recovered
   // list and no complete recovery.
-  EXPECT_EQ(2u, recovered_packet_list_.size());
-  EXPECT_TRUE(recovered_packet_list_.size() != media_packet_list_.size());
-  EXPECT_FALSE(IsRecoveryComplete());
+  EXPECT_EQ(2u, this->recovered_packets_.size());
+  EXPECT_TRUE(this->recovered_packets_.size() != this->media_packets_.size());
+  EXPECT_FALSE(this->IsRecoveryComplete());
 }
 
 // Verify we can still recover frame if media packets are reordered.
-TEST_F(RtpFecTest, FecRecoveryWithMediaOutOfOrder) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithMediaOutOfOrder) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr uint8_t kProtectionFactor = 20;
 
   // One frame: 3 media packets, 1 FEC packet.
   //         -----Frame 1----
   //  #0(media) #1(media) #2(media) #3(FEC).
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(3, 0);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(3, 0);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // Lose one media packet (seq# 1).
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
   // Reorder received media packets.
-  auto it0 = received_packet_list_.begin();
-  auto it2 = received_packet_list_.begin();
+  auto it0 = this->received_packets_.begin();
+  auto it2 = this->received_packets_.begin();
   it2++;
   std::swap(*it0, *it2);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Expect 3 media packets in recovered list, and complete recovery.
-  EXPECT_EQ(3u, recovered_packet_list_.size());
-  EXPECT_TRUE(IsRecoveryComplete());
+  EXPECT_EQ(3u, this->recovered_packets_.size());
+  EXPECT_TRUE(this->IsRecoveryComplete());
 }
 
 // Verify we can still recover frame if FEC is received before media packets.
-TEST_F(RtpFecTest, FecRecoveryWithFecOutOfOrder) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithFecOutOfOrder) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr uint8_t kProtectionFactor = 20;
 
   // One frame: 3 media packets, 1 FEC packet.
   //         -----Frame 1----
   //  #0(media) #1(media) #2(media) #3(FEC).
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(3, 0);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(3, 0);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // Lose one media packet (seq# 1).
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
   // Add FEC packet to received list before the media packets.
-  ReceivedPackets(fec_packet_list_, fec_loss_mask_, true);
+  this->ReceivedPackets(this->generated_fec_packets_, this->fec_loss_mask_,
+                        true);
   // Add media packets to received list.
-  ReceivedPackets(media_packet_list_, media_loss_mask_, false);
+  this->ReceivedPackets(this->media_packets_, this->media_loss_mask_, false);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Expect 3 media packets in recovered list, and complete recovery.
-  EXPECT_EQ(3u, recovered_packet_list_.size());
-  EXPECT_TRUE(IsRecoveryComplete());
+  EXPECT_EQ(3u, this->recovered_packets_.size());
+  EXPECT_TRUE(this->IsRecoveryComplete());
 }
 
 // Test 50% protection with random mask type: Two cases are considered:
 // a 50% non-consecutive loss which can be fully recovered, and a 50%
 // consecutive loss which cannot be fully recovered.
-TEST_F(RtpFecTest, FecRecoveryWithLoss50percRandomMask) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithLoss50percRandomMask) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 255;
 
   // Packet Mask for (4,4,0) code, from random mask table.
   // (kNumMediaPackets = 4; num_fec_packets = 4, kNumImportantPackets = 0)
 
   //         media#0   media#1  media#2    media#3
   // fec#0:    1          1        0          0
   // fec#1:    1          0        1          0
   // fec#2:    0          0        1          1
   // fec#3:    0          1        0          1
   //
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskRandom, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskRandom, &this->generated_fec_packets_));
 
   // Expect 4 FEC packets.
-  EXPECT_EQ(4u, fec_packet_list_.size());
+  EXPECT_EQ(4u, this->generated_fec_packets_.size());
 
   // 4 packets lost: 3 media packets (0, 2, 3), and one FEC packet (0) lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  fec_loss_mask_[0] = 1;
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[2] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->fec_loss_mask_[0] = 1;
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // With media packet#1 and FEC packets #1, #2, #3, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 4 consecutive packets lost: media packets 0, 1, 2, 3.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[2] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Cannot get complete recovery for this loss configuration with random mask.
-  EXPECT_FALSE(IsRecoveryComplete());
+  EXPECT_FALSE(this->IsRecoveryComplete());
 }
 
 // Test 50% protection with bursty type: Three cases are considered:
 // two 50% consecutive losses which can be fully recovered, and one
 // non-consecutive which cannot be fully recovered.
-TEST_F(RtpFecTest, FecRecoveryWithLoss50percBurstyMask) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithLoss50percBurstyMask) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 255;
 
   // Packet Mask for (4,4,0) code, from bursty mask table.
   // (kNumMediaPackets = 4; num_fec_packets = 4, kNumImportantPackets = 0)
 
   //         media#0   media#1  media#2    media#3
   // fec#0:    1          0        0          0
   // fec#1:    1          1        0          0
   // fec#2:    0          1        1          0
   // fec#3:    0          0        1          1
   //
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 4 FEC packets.
-  EXPECT_EQ(4u, fec_packet_list_.size());
+  EXPECT_EQ(4u, this->generated_fec_packets_.size());
 
   // 4 consecutive packets lost: media packets 0,1,2,3.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[2] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Expect complete recovery for consecutive packet loss <= 50%.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 4 consecutive packets lost: media packets 1,2, 3, and FEC packet 0.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  fec_loss_mask_[0] = 1;
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[2] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->fec_loss_mask_[0] = 1;
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Expect complete recovery for consecutive packet loss <= 50%.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 4 packets lost (non-consecutive loss): media packets 0, 3, and FEC# 0, 3.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  fec_loss_mask_[0] = 1;
-  fec_loss_mask_[3] = 1;
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->fec_loss_mask_[0] = 1;
+  this->fec_loss_mask_[3] = 1;
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Cannot get complete recovery for this loss configuration.
-  EXPECT_FALSE(IsRecoveryComplete());
+  EXPECT_FALSE(this->IsRecoveryComplete());
 }
 
-TEST_F(RtpFecTest, FecRecoveryNoLossUep) {
+TYPED_TEST(RtpFecTest, FecRecoveryNoLossUep) {
   constexpr int kNumImportantPackets = 2;
   constexpr bool kUseUnequalProtection = true;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 60;
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // No packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // No packets lost, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
+  EXPECT_TRUE(this->IsRecoveryComplete());
 }
 
-TEST_F(RtpFecTest, FecRecoveryWithLossUep) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithLossUep) {
   constexpr int kNumImportantPackets = 2;
   constexpr bool kUseUnequalProtection = true;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 60;
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // 1 media packet lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // One packet lost, one FEC packet, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 2 media packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
 
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // 2 packets lost, one FEC packet, cannot get complete recovery.
-  EXPECT_FALSE(IsRecoveryComplete());
+  EXPECT_FALSE(this->IsRecoveryComplete());
 }
 
 // Test 50% protection with random mask type for UEP on.
-TEST_F(RtpFecTest, FecRecoveryWithLoss50percUepRandomMask) {
+TYPED_TEST(RtpFecTest, FecRecoveryWithLoss50percUepRandomMask) {
   constexpr int kNumImportantPackets = 1;
   constexpr bool kUseUnequalProtection = true;
   constexpr int kNumMediaPackets = 4;
   constexpr uint8_t kProtectionFactor = 255;
 
   // Packet Mask for (4,4,1) code, from random mask table.
   // (kNumMediaPackets = 4; num_fec_packets = 4, kNumImportantPackets = 1)
 
   //         media#0   media#1  media#2    media#3
   // fec#0:    1          0        0          0
   // fec#1:    1          1        0          0
   // fec#2:    1          0        1          1
   // fec#3:    0          1        1          0
   //
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
-
-  EXPECT_EQ(0, fec_.GenerateFec(media_packet_list_, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskRandom, &fec_packet_list_));
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
+
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(this->media_packets_, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskRandom, &this->generated_fec_packets_));
 
   // Expect 4 FEC packets.
-  EXPECT_EQ(4u, fec_packet_list_.size());
+  EXPECT_EQ(4u, this->generated_fec_packets_.size());
 
   // 4 packets lost: 3 media packets and FEC packet#1 lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  fec_loss_mask_[1] = 1;
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[2] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->fec_loss_mask_[1] = 1;
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // With media packet#3 and FEC packets #0, #1, #3, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 5 packets lost: 4 media packets and one FEC packet#2 lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  fec_loss_mask_[2] = 1;
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[1] = 1;
-  media_loss_mask_[2] = 1;
-  media_loss_mask_[3] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->fec_loss_mask_[2] = 1;
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[1] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->media_loss_mask_[3] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Cannot get complete recovery for this loss configuration.
-  EXPECT_FALSE(IsRecoveryComplete());
-}
-
-TEST_F(RtpFecTest, FecRecoveryNonConsecutivePackets) {
+  EXPECT_FALSE(this->IsRecoveryComplete());
+}
+
+TYPED_TEST(RtpFecTest, FecRecoveryNonConsecutivePackets) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 5;
   constexpr uint8_t kProtectionFactor = 60;
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
   // Create a new temporary packet list for generating FEC packets.
   // This list should have every other packet removed.
-  PacketList protected_media_packets;
-  DeepCopyEveryNthPacket(media_packet_list_, 2, &protected_media_packets);
-
-  EXPECT_EQ(0, fec_.GenerateFec(protected_media_packets, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  ForwardErrorCorrection::PacketList protected_media_packets;
+  DeepCopyEveryNthPacket(this->media_packets_, 2, &protected_media_packets);
+
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(protected_media_packets, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 1 FEC packet.
-  EXPECT_EQ(1u, fec_packet_list_.size());
+  EXPECT_EQ(1u, this->generated_fec_packets_.size());
 
   // 1 protected media packet lost
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[2] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[2] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // One packet lost, one FEC packet, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // Unprotected packet lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[1] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[1] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Unprotected packet lost. Recovery not possible.
-  EXPECT_FALSE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_FALSE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 2 media packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[0] = 1;
-  media_loss_mask_[2] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[0] = 1;
+  this->media_loss_mask_[2] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // 2 protected packets lost, one FEC packet, cannot get complete recovery.
-  EXPECT_FALSE(IsRecoveryComplete());
-}
-
-TEST_F(RtpFecTest, FecRecoveryNonConsecutivePacketsExtension) {
+  EXPECT_FALSE(this->IsRecoveryComplete());
+}
+
+TYPED_TEST(RtpFecTest, FecRecoveryNonConsecutivePacketsExtension) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 21;
   uint8_t kProtectionFactor = 127;
 
-  fec_seq_num_ = ConstructMediaPackets(kNumMediaPackets);
+  this->media_packets_ =
+      this->media_packet_generator_.ConstructMediaPackets(kNumMediaPackets);
 
   // Create a new temporary packet list for generating FEC packets.
   // This list should have every other packet removed.
-  PacketList protected_media_packets;
-  DeepCopyEveryNthPacket(media_packet_list_, 2, &protected_media_packets);
+  ForwardErrorCorrection::PacketList protected_media_packets;
+  DeepCopyEveryNthPacket(this->media_packets_, 2, &protected_media_packets);
 
   // Zero column insertion will have to extend the size of the packet
   // mask since the number of actual packets are 21, while the number
   // of protected packets are 11.
-  EXPECT_EQ(0, fec_.GenerateFec(protected_media_packets, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(protected_media_packets, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 5 FEC packet.
-  EXPECT_EQ(5u, fec_packet_list_.size());
+  EXPECT_EQ(5u, this->generated_fec_packets_.size());
 
   // Last protected media packet lost
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[kNumMediaPackets - 1] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[kNumMediaPackets - 1] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // One packet lost, one FEC packet, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // Last unprotected packet lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[kNumMediaPackets - 2] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[kNumMediaPackets - 2] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Unprotected packet lost. Recovery not possible.
-  EXPECT_FALSE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_FALSE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 6 media packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[kNumMediaPackets - 11] = 1;
-  media_loss_mask_[kNumMediaPackets - 9] = 1;
-  media_loss_mask_[kNumMediaPackets - 7] = 1;
-  media_loss_mask_[kNumMediaPackets - 5] = 1;
-  media_loss_mask_[kNumMediaPackets - 3] = 1;
-  media_loss_mask_[kNumMediaPackets - 1] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[kNumMediaPackets - 11] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 9] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 7] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 5] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 3] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 1] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // 5 protected packets lost, one FEC packet, cannot get complete recovery.
-  EXPECT_FALSE(IsRecoveryComplete());
-}
-
-TEST_F(RtpFecTest, FecRecoveryNonConsecutivePacketsWrap) {
+  EXPECT_FALSE(this->IsRecoveryComplete());
+}
+
+TYPED_TEST(RtpFecTest, FecRecoveryNonConsecutivePacketsWrap) {
   constexpr int kNumImportantPackets = 0;
   constexpr bool kUseUnequalProtection = false;
   constexpr int kNumMediaPackets = 21;
   uint8_t kProtectionFactor = 127;
 
-  fec_seq_num_ = ConstructMediaPacketsSeqNum(kNumMediaPackets, 0xFFFF - 5);
+  this->media_packets_ = this->media_packet_generator_.ConstructMediaPackets(
+      kNumMediaPackets, 0xFFFF - 5);
 
   // Create a new temporary packet list for generating FEC packets.
   // This list should have every other packet removed.
-  PacketList protected_media_packets;
-  DeepCopyEveryNthPacket(media_packet_list_, 2, &protected_media_packets);
+  ForwardErrorCorrection::PacketList protected_media_packets;
+  DeepCopyEveryNthPacket(this->media_packets_, 2, &protected_media_packets);
 
   // Zero column insertion will have to extend the size of the packet
   // mask since the number of actual packets are 21, while the number
   // of protected packets are 11.
-  EXPECT_EQ(0, fec_.GenerateFec(protected_media_packets, kProtectionFactor,
-                                kNumImportantPackets, kUseUnequalProtection,
-                                webrtc::kFecMaskBursty, &fec_packet_list_));
+  EXPECT_EQ(
+      0, this->fec_.EncodeFec(protected_media_packets, kProtectionFactor,
+                              kNumImportantPackets, kUseUnequalProtection,
+                              kFecMaskBursty, &this->generated_fec_packets_));
 
   // Expect 5 FEC packet.
-  EXPECT_EQ(5u, fec_packet_list_.size());
+  EXPECT_EQ(5u, this->generated_fec_packets_.size());
 
   // Last protected media packet lost
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[kNumMediaPackets - 1] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[kNumMediaPackets - 1] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // One packet lost, one FEC packet, expect complete recovery.
-  EXPECT_TRUE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_TRUE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // Last unprotected packet lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[kNumMediaPackets - 2] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[kNumMediaPackets - 2] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // Unprotected packet lost. Recovery not possible.
-  EXPECT_FALSE(IsRecoveryComplete());
-  recovered_packet_list_.clear();
+  EXPECT_FALSE(this->IsRecoveryComplete());
+  this->recovered_packets_.clear();
 
   // 6 media packets lost.
-  memset(media_loss_mask_, 0, sizeof(media_loss_mask_));
-  memset(fec_loss_mask_, 0, sizeof(fec_loss_mask_));
-  media_loss_mask_[kNumMediaPackets - 11] = 1;
-  media_loss_mask_[kNumMediaPackets - 9] = 1;
-  media_loss_mask_[kNumMediaPackets - 7] = 1;
-  media_loss_mask_[kNumMediaPackets - 5] = 1;
-  media_loss_mask_[kNumMediaPackets - 3] = 1;
-  media_loss_mask_[kNumMediaPackets - 1] = 1;
-  NetworkReceivedPackets(media_loss_mask_, fec_loss_mask_);
-
-  EXPECT_EQ(0, fec_.DecodeFec(&received_packet_list_, &recovered_packet_list_));
+  memset(this->media_loss_mask_, 0, sizeof(this->media_loss_mask_));
+  memset(this->fec_loss_mask_, 0, sizeof(this->fec_loss_mask_));
+  this->media_loss_mask_[kNumMediaPackets - 11] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 9] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 7] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 5] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 3] = 1;
+  this->media_loss_mask_[kNumMediaPackets - 1] = 1;
+  this->NetworkReceivedPackets(this->media_loss_mask_, this->fec_loss_mask_);
+
+  EXPECT_EQ(0, this->fec_.DecodeFec(&this->received_packets_,
+                                    &this->recovered_packets_));
 
   // 5 protected packets lost, one FEC packet, cannot get complete recovery.
-  EXPECT_FALSE(IsRecoveryComplete());
-}
-
-void RtpFecTest::TearDown() {
-  fec_.ResetState(&recovered_packet_list_);
-  recovered_packet_list_.clear();
-  media_packet_list_.clear();
-  EXPECT_TRUE(media_packet_list_.empty());
-}
-
-bool RtpFecTest::IsRecoveryComplete() {
+  EXPECT_FALSE(this->IsRecoveryComplete());
+}
+
+template <typename ForwardErrorCorrectionType>
+bool RtpFecTest<ForwardErrorCorrectionType>::IsRecoveryComplete() {
   // We must have equally many recovered packets as original packets.
-  if (recovered_packet_list_.size() != media_packet_list_.size()) {
+  if (recovered_packets_.size() != media_packets_.size()) {
     return false;
   }
 
   // All recovered packets must be identical to the corresponding
   // original packets.
   using PacketPtr = std::unique_ptr<ForwardErrorCorrection::Packet>;
   using RecoveredPacketPtr =
     std::unique_ptr<ForwardErrorCorrection::RecoveredPacket>;
   auto cmp = [](const PacketPtr& media_packet,
                 const RecoveredPacketPtr& recovered_packet) {
     if (media_packet->length != recovered_packet->pkt->length) {
       return false;
     }
     if (memcmp(media_packet->data,
                recovered_packet->pkt->data,
                media_packet->length) != 0) {
       return false;
     }
     return true;
   };
-  return std::equal(media_packet_list_.cbegin(), media_packet_list_.cend(),
-                    recovered_packet_list_.cbegin(), cmp);
+  return std::equal(media_packets_.cbegin(), media_packets_.cend(),
+                    recovered_packets_.cbegin(), cmp);
 }
 
-void RtpFecTest::NetworkReceivedPackets(int* media_loss_mask,
-                                        int* fec_loss_mask) {
+template <typename ForwardErrorCorrectionType>
+void RtpFecTest<ForwardErrorCorrectionType>::NetworkReceivedPackets(
+    int* media_loss_mask,
+    int* fec_loss_mask) {
   constexpr bool kFecPacket = true;
-  ReceivedPackets(media_packet_list_, media_loss_mask, !kFecPacket);
-  ReceivedPackets(fec_packet_list_, fec_loss_mask, kFecPacket);
+  ReceivedPackets(media_packets_, media_loss_mask, !kFecPacket);
+  ReceivedPackets(generated_fec_packets_, fec_loss_mask, kFecPacket);
 }
 
-template <typename T>
-void RtpFecTest::ReceivedPackets(const T& packet_list, int* loss_mask,
-                                 bool is_fec) {
-  int seq_num = fec_seq_num_;
+template <typename ForwardErrorCorrectionType>
+template <typename PacketListType>
+void RtpFecTest<ForwardErrorCorrectionType>::ReceivedPackets(
+    const PacketListType& packet_list,
+    int* loss_mask,
+    bool is_fec) {
+  uint16_t fec_seq_num = media_packet_generator_.GetFecSeqNum();
   int packet_idx = 0;
 
   for (const auto& packet : packet_list) {
     if (loss_mask[packet_idx] == 0) {
       std::unique_ptr<ForwardErrorCorrection::ReceivedPacket> received_packet(
           new ForwardErrorCorrection::ReceivedPacket());
       received_packet->pkt = new ForwardErrorCorrection::Packet();
       received_packet->pkt->length = packet->length;
       memcpy(received_packet->pkt->data, packet->data, packet->length);
       received_packet->is_fec = is_fec;
       if (!is_fec) {
         // For media packets, the sequence number and marker bit is
         // obtained from RTP header. These were set in ConstructMediaPackets().
         received_packet->seq_num =
-            webrtc::ByteReader<uint16_t>::ReadBigEndian(&packet->data[2]);
+            ByteReader<uint16_t>::ReadBigEndian(&packet->data[2]);
       } else {
         // The sequence number, marker bit, and ssrc number are defined in the
         // RTP header of the FEC packet, which is not constructed in this test.
         // So we set these values below based on the values generated in
         // ConstructMediaPackets().
-        received_packet->seq_num = seq_num;
+        received_packet->seq_num = fec_seq_num;
         // The ssrc value for FEC packets is set to the one used for the
         // media packets in ConstructMediaPackets().
-        received_packet->ssrc = ssrc_;
+        received_packet->ssrc = kMediaSsrc;
       }
-      received_packet_list_.push_back(std::move(received_packet));
+      received_packets_.push_back(std::move(received_packet));
     }
     packet_idx++;
     // Sequence number of FEC packets are defined as increment by 1 from
     // last media packet in frame.
-    if (is_fec) seq_num++;
+    if (is_fec)
+      fec_seq_num++;
   }
 }
 
-int RtpFecTest::ConstructMediaPacketsSeqNum(int num_media_packets,
-                                            int start_seq_num) {
-  RTC_DCHECK_GT(num_media_packets, 0);
-  int sequence_number = start_seq_num;
-  int time_stamp = random_.Rand<int>();
-
-  for (int i = 0; i < num_media_packets; ++i) {
-    std::unique_ptr<ForwardErrorCorrection::Packet> media_packet(
-        new ForwardErrorCorrection::Packet());
-    constexpr uint32_t kMinPacketSize = kRtpHeaderSize;
-    const uint32_t kMaxPacketSize = IP_PACKET_SIZE - kRtpHeaderSize -
-                                    kTransportOverhead -
-                                    fec_.MaxPacketOverhead();
-    media_packet->length = random_.Rand(kMinPacketSize, kMaxPacketSize);
-
-    // Generate random values for the first 2 bytes
-    media_packet->data[0] = random_.Rand<uint8_t>();
-    media_packet->data[1] = random_.Rand<uint8_t>();
-
-    // The first two bits are assumed to be 10 by the FEC encoder.
-    // In fact the FEC decoder will set the two first bits to 10 regardless of
-    // what they actually were. Set the first two bits to 10 so that a memcmp
-    // can be performed for the whole restored packet.
-    media_packet->data[0] |= 0x80;
-    media_packet->data[0] &= 0xbf;
-
-    // FEC is applied to a whole frame.
-    // A frame is signaled by multiple packets without the marker bit set
-    // followed by the last packet of the frame for which the marker bit is set.
-    // Only push one (fake) frame to the FEC.
-    media_packet->data[1] &= 0x7f;
-
-    webrtc::ByteWriter<uint16_t>::WriteBigEndian(&media_packet->data[2],
-                                                 sequence_number);
-    webrtc::ByteWriter<uint32_t>::WriteBigEndian(&media_packet->data[4],
-                                                 time_stamp);
-    webrtc::ByteWriter<uint32_t>::WriteBigEndian(&media_packet->data[8], ssrc_);
-
-    // Generate random values for payload.
-    for (size_t j = 12; j < media_packet->length; ++j) {
-      media_packet->data[j] = random_.Rand<uint8_t>();
-    }
-    sequence_number++;
-    media_packet_list_.push_back(std::move(media_packet));
-  }
-  // Last packet, set marker bit.
-  ForwardErrorCorrection::Packet* media_packet =
-      media_packet_list_.back().get();
-  RTC_DCHECK(media_packet);
-  media_packet->data[1] |= 0x80;
-  return sequence_number;
-}
-
-int RtpFecTest::ConstructMediaPackets(int num_media_packets) {
-  return ConstructMediaPacketsSeqNum(num_media_packets, random_.Rand<int>());
-}
-
-void RtpFecTest::DeepCopyEveryNthPacket(const PacketList& src, int n,
-                                        PacketList* dst) {
-  RTC_DCHECK_GT(n, 0);
-  int i = 0;
-  for (const auto& packet : src) {
-    if (i % n == 0) {
-      dst->emplace_back(new ForwardErrorCorrection::Packet(*packet));
-    }
-    ++i;
-  }
-}
+}  // namespace webrtc