Repo created

TMessagesProj/jni/voip/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc

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+/*
+ *  Copyright (c) 2014 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 "modules/audio_coding/codecs/red/audio_encoder_copy_red.h"
+
+#include <string.h>
+
+#include <utility>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/byte_order.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+static constexpr const int kRedMaxPacketSize =
+    1 << 10;  // RED packets must be less than 1024 bytes to fit the 10 bit
+              // block length.
+static constexpr const size_t kRedMaxTimestampDelta =
+    1 << 14;  // RED packets can encode a timestamp delta of 14 bits.
+static constexpr const size_t kAudioMaxRtpPacketLen =
+    1200;  // The typical MTU is 1200 bytes.
+
+static constexpr size_t kRedHeaderLength = 4;  // 4 bytes RED header.
+static constexpr size_t kRedLastHeaderLength =
+    1;  // reduced size for last RED header.
+
+static constexpr size_t kRedNumberOfRedundantEncodings =
+    1;  // The level of redundancy we support.
+
+AudioEncoderCopyRed::Config::Config() = default;
+AudioEncoderCopyRed::Config::Config(Config&&) = default;
+AudioEncoderCopyRed::Config::~Config() = default;
+
+size_t GetMaxRedundancyFromFieldTrial(const FieldTrialsView& field_trials) {
+  const std::string red_trial =
+      field_trials.Lookup("WebRTC-Audio-Red-For-Opus");
+  size_t redundancy = 0;
+  if (sscanf(red_trial.c_str(), "Enabled-%zu", &redundancy) != 1 ||
+      redundancy > 9) {
+    return kRedNumberOfRedundantEncodings;
+  }
+  return redundancy;
+}
+
+AudioEncoderCopyRed::AudioEncoderCopyRed(Config&& config,
+                                         const FieldTrialsView& field_trials)
+    : speech_encoder_(std::move(config.speech_encoder)),
+      primary_encoded_(0, kAudioMaxRtpPacketLen),
+      max_packet_length_(kAudioMaxRtpPacketLen),
+      red_payload_type_(config.payload_type) {
+  RTC_CHECK(speech_encoder_) << "Speech encoder not provided.";
+
+  auto number_of_redundant_encodings =
+      GetMaxRedundancyFromFieldTrial(field_trials);
+  for (size_t i = 0; i < number_of_redundant_encodings; i++) {
+    std::pair<EncodedInfo, rtc::Buffer> redundant;
+    redundant.second.EnsureCapacity(kAudioMaxRtpPacketLen);
+    redundant_encodings_.push_front(std::move(redundant));
+  }
+}
+
+AudioEncoderCopyRed::~AudioEncoderCopyRed() = default;
+
+int AudioEncoderCopyRed::SampleRateHz() const {
+  return speech_encoder_->SampleRateHz();
+}
+
+size_t AudioEncoderCopyRed::NumChannels() const {
+  return speech_encoder_->NumChannels();
+}
+
+int AudioEncoderCopyRed::RtpTimestampRateHz() const {
+  return speech_encoder_->RtpTimestampRateHz();
+}
+
+size_t AudioEncoderCopyRed::Num10MsFramesInNextPacket() const {
+  return speech_encoder_->Num10MsFramesInNextPacket();
+}
+
+size_t AudioEncoderCopyRed::Max10MsFramesInAPacket() const {
+  return speech_encoder_->Max10MsFramesInAPacket();
+}
+
+int AudioEncoderCopyRed::GetTargetBitrate() const {
+  return speech_encoder_->GetTargetBitrate();
+}
+
+AudioEncoder::EncodedInfo AudioEncoderCopyRed::EncodeImpl(
+    uint32_t rtp_timestamp,
+    rtc::ArrayView<const int16_t> audio,
+    rtc::Buffer* encoded) {
+  primary_encoded_.Clear();
+  EncodedInfo info =
+      speech_encoder_->Encode(rtp_timestamp, audio, &primary_encoded_);
+  RTC_CHECK(info.redundant.empty()) << "Cannot use nested redundant encoders.";
+  RTC_DCHECK_EQ(primary_encoded_.size(), info.encoded_bytes);
+
+  if (info.encoded_bytes == 0) {
+    return info;
+  }
+  if (info.encoded_bytes >= kRedMaxPacketSize) {
+    // Fallback to the primary encoding if the encoded size is more than
+    // what RED can encode as redundancy (1024 bytes). This can happen with
+    // Opus stereo at the highest bitrate which consumes up to 1276 bytes.
+    encoded->AppendData(primary_encoded_);
+    return info;
+  }
+  RTC_DCHECK_GT(max_packet_length_, info.encoded_bytes);
+
+  size_t header_length_bytes = kRedLastHeaderLength;
+  size_t bytes_available = max_packet_length_ - info.encoded_bytes;
+  auto it = redundant_encodings_.begin();
+
+  // Determine how much redundancy we can fit into our packet by
+  // iterating forward. This is determined both by the length as well
+  // as the timestamp difference. The latter can occur with opus DTX which
+  // has timestamp gaps of 400ms which exceeds REDs timestamp delta field size.
+  for (; it != redundant_encodings_.end(); it++) {
+    if (bytes_available < kRedHeaderLength + it->first.encoded_bytes) {
+      break;
+    }
+    if (it->first.encoded_bytes == 0) {
+      break;
+    }
+    if (rtp_timestamp - it->first.encoded_timestamp >= kRedMaxTimestampDelta) {
+      break;
+    }
+    bytes_available -= kRedHeaderLength + it->first.encoded_bytes;
+    header_length_bytes += kRedHeaderLength;
+  }
+
+  // Allocate room for RFC 2198 header.
+  encoded->SetSize(header_length_bytes);
+
+  // Iterate backwards and append the data.
+  size_t header_offset = 0;
+  while (it-- != redundant_encodings_.begin()) {
+    encoded->AppendData(it->second);
+
+    const uint32_t timestamp_delta =
+        info.encoded_timestamp - it->first.encoded_timestamp;
+    encoded->data()[header_offset] = it->first.payload_type | 0x80;
+    rtc::SetBE16(static_cast<uint8_t*>(encoded->data()) + header_offset + 1,
+                 (timestamp_delta << 2) | (it->first.encoded_bytes >> 8));
+    encoded->data()[header_offset + 3] = it->first.encoded_bytes & 0xff;
+    header_offset += kRedHeaderLength;
+    info.redundant.push_back(it->first);
+  }
+
+  // `info` will be implicitly cast to an EncodedInfoLeaf struct, effectively
+  // discarding the (empty) vector of redundant information. This is
+  // intentional.
+  if (header_length_bytes > kRedHeaderLength) {
+    info.redundant.push_back(info);
+    RTC_DCHECK_EQ(info.speech,
+                  info.redundant[info.redundant.size() - 1].speech);
+  }
+
+  encoded->AppendData(primary_encoded_);
+  RTC_DCHECK_EQ(header_offset, header_length_bytes - 1);
+  encoded->data()[header_offset] = info.payload_type;
+
+  // Shift the redundant encodings.
+  auto rit = redundant_encodings_.rbegin();
+  for (auto next = std::next(rit); next != redundant_encodings_.rend();
+       rit++, next = std::next(rit)) {
+    rit->first = next->first;
+    rit->second.SetData(next->second);
+  }
+  it = redundant_encodings_.begin();
+  if (it != redundant_encodings_.end()) {
+    it->first = info;
+    it->second.SetData(primary_encoded_);
+  }
+
+  // Update main EncodedInfo.
+  info.payload_type = red_payload_type_;
+  info.encoded_bytes = encoded->size();
+  return info;
+}
+
+void AudioEncoderCopyRed::Reset() {
+  speech_encoder_->Reset();
+  auto number_of_redundant_encodings = redundant_encodings_.size();
+  redundant_encodings_.clear();
+  for (size_t i = 0; i < number_of_redundant_encodings; i++) {
+    std::pair<EncodedInfo, rtc::Buffer> redundant;
+    redundant.second.EnsureCapacity(kAudioMaxRtpPacketLen);
+    redundant_encodings_.push_front(std::move(redundant));
+  }
+}
+
+bool AudioEncoderCopyRed::SetFec(bool enable) {
+  return speech_encoder_->SetFec(enable);
+}
+
+bool AudioEncoderCopyRed::SetDtx(bool enable) {
+  return speech_encoder_->SetDtx(enable);
+}
+
+bool AudioEncoderCopyRed::GetDtx() const {
+  return speech_encoder_->GetDtx();
+}
+
+bool AudioEncoderCopyRed::SetApplication(Application application) {
+  return speech_encoder_->SetApplication(application);
+}
+
+void AudioEncoderCopyRed::SetMaxPlaybackRate(int frequency_hz) {
+  speech_encoder_->SetMaxPlaybackRate(frequency_hz);
+}
+
+bool AudioEncoderCopyRed::EnableAudioNetworkAdaptor(
+    const std::string& config_string,
+    RtcEventLog* event_log) {
+  return speech_encoder_->EnableAudioNetworkAdaptor(config_string, event_log);
+}
+
+void AudioEncoderCopyRed::DisableAudioNetworkAdaptor() {
+  speech_encoder_->DisableAudioNetworkAdaptor();
+}
+
+void AudioEncoderCopyRed::OnReceivedUplinkPacketLossFraction(
+    float uplink_packet_loss_fraction) {
+  speech_encoder_->OnReceivedUplinkPacketLossFraction(
+      uplink_packet_loss_fraction);
+}
+
+void AudioEncoderCopyRed::OnReceivedUplinkBandwidth(
+    int target_audio_bitrate_bps,
+    absl::optional<int64_t> bwe_period_ms) {
+  speech_encoder_->OnReceivedUplinkBandwidth(target_audio_bitrate_bps,
+                                             bwe_period_ms);
+}
+
+void AudioEncoderCopyRed::OnReceivedUplinkAllocation(
+    BitrateAllocationUpdate update) {
+  speech_encoder_->OnReceivedUplinkAllocation(update);
+}
+
+absl::optional<std::pair<TimeDelta, TimeDelta>>
+AudioEncoderCopyRed::GetFrameLengthRange() const {
+  return speech_encoder_->GetFrameLengthRange();
+}
+
+void AudioEncoderCopyRed::OnReceivedRtt(int rtt_ms) {
+  speech_encoder_->OnReceivedRtt(rtt_ms);
+}
+
+void AudioEncoderCopyRed::OnReceivedOverhead(size_t overhead_bytes_per_packet) {
+  max_packet_length_ = kAudioMaxRtpPacketLen - overhead_bytes_per_packet;
+  return speech_encoder_->OnReceivedOverhead(overhead_bytes_per_packet);
+}
+
+void AudioEncoderCopyRed::SetReceiverFrameLengthRange(int min_frame_length_ms,
+                                                      int max_frame_length_ms) {
+  return speech_encoder_->SetReceiverFrameLengthRange(min_frame_length_ms,
+                                                      max_frame_length_ms);
+}
+
+ANAStats AudioEncoderCopyRed::GetANAStats() const {
+  return speech_encoder_->GetANAStats();
+}
+
+rtc::ArrayView<std::unique_ptr<AudioEncoder>>
+AudioEncoderCopyRed::ReclaimContainedEncoders() {
+  return rtc::ArrayView<std::unique_ptr<AudioEncoder>>(&speech_encoder_, 1);
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.h

@@ -0,0 +1,102 @@
+/*
+ *  Copyright (c) 2014 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 MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
+#define MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <list>
+#include <memory>
+#include <utility>
+
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "api/audio_codecs/audio_encoder.h"
+#include "api/field_trials_view.h"
+#include "api/units/time_delta.h"
+#include "rtc_base/buffer.h"
+
+namespace webrtc {
+
+// This class implements redundant audio coding as described in
+//   https://tools.ietf.org/html/rfc2198
+// The class object will have an underlying AudioEncoder object that performs
+// the actual encodings. The current class will gather the N latest encodings
+// from the underlying codec into one packet. Currently N is hard-coded to 2.
+
+class AudioEncoderCopyRed final : public AudioEncoder {
+ public:
+  struct Config {
+    Config();
+    Config(Config&&);
+    ~Config();
+    int payload_type;
+    std::unique_ptr<AudioEncoder> speech_encoder;
+  };
+
+  AudioEncoderCopyRed(Config&& config, const FieldTrialsView& field_trials);
+
+  ~AudioEncoderCopyRed() override;
+
+  AudioEncoderCopyRed(const AudioEncoderCopyRed&) = delete;
+  AudioEncoderCopyRed& operator=(const AudioEncoderCopyRed&) = delete;
+
+  int SampleRateHz() const override;
+  size_t NumChannels() const override;
+  int RtpTimestampRateHz() const override;
+  size_t Num10MsFramesInNextPacket() const override;
+  size_t Max10MsFramesInAPacket() const override;
+  int GetTargetBitrate() const override;
+
+  void Reset() override;
+  bool SetFec(bool enable) override;
+
+  bool SetDtx(bool enable) override;
+  bool GetDtx() const override;
+
+  bool SetApplication(Application application) override;
+  void SetMaxPlaybackRate(int frequency_hz) override;
+  bool EnableAudioNetworkAdaptor(const std::string& config_string,
+                                 RtcEventLog* event_log) override;
+  void DisableAudioNetworkAdaptor() override;
+  void OnReceivedUplinkPacketLossFraction(
+      float uplink_packet_loss_fraction) override;
+  void OnReceivedUplinkBandwidth(
+      int target_audio_bitrate_bps,
+      absl::optional<int64_t> bwe_period_ms) override;
+  void OnReceivedUplinkAllocation(BitrateAllocationUpdate update) override;
+  void OnReceivedRtt(int rtt_ms) override;
+  void OnReceivedOverhead(size_t overhead_bytes_per_packet) override;
+  void SetReceiverFrameLengthRange(int min_frame_length_ms,
+                                   int max_frame_length_ms) override;
+  ANAStats GetANAStats() const override;
+  absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange()
+      const override;
+  rtc::ArrayView<std::unique_ptr<AudioEncoder>> ReclaimContainedEncoders()
+      override;
+
+ protected:
+  EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
+                         rtc::ArrayView<const int16_t> audio,
+                         rtc::Buffer* encoded) override;
+
+ private:
+  std::unique_ptr<AudioEncoder> speech_encoder_;
+  rtc::Buffer primary_encoded_;
+  size_t max_packet_length_;
+  int red_payload_type_;
+  std::list<std::pair<EncodedInfo, rtc::Buffer>> redundant_encodings_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_

TMessagesProj/jni/voip/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red_unittest.cc

@@ -0,0 +1,658 @@
+/*
+ *  Copyright (c) 2014 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 "modules/audio_coding/codecs/red/audio_encoder_copy_red.h"
+
+#include <memory>
+#include <vector>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/numerics/safe_conversions.h"
+#include "test/field_trial.h"
+#include "test/gtest.h"
+#include "test/mock_audio_encoder.h"
+#include "test/scoped_key_value_config.h"
+#include "test/testsupport/rtc_expect_death.h"
+
+using ::testing::_;
+using ::testing::Eq;
+using ::testing::InSequence;
+using ::testing::Invoke;
+using ::testing::MockFunction;
+using ::testing::Not;
+using ::testing::Optional;
+using ::testing::Return;
+using ::testing::SetArgPointee;
+
+namespace webrtc {
+
+namespace {
+static const size_t kMaxNumSamples = 48 * 10 * 2;  // 10 ms @ 48 kHz stereo.
+static const size_t kRedLastHeaderLength =
+    1;  // 1 byte RED header for the last element.
+}  // namespace
+
+class AudioEncoderCopyRedTest : public ::testing::Test {
+ protected:
+  AudioEncoderCopyRedTest()
+      : mock_encoder_(new MockAudioEncoder),
+        timestamp_(4711),
+        sample_rate_hz_(16000),
+        num_audio_samples_10ms(sample_rate_hz_ / 100),
+        red_payload_type_(63) {
+    AudioEncoderCopyRed::Config config;
+    config.payload_type = red_payload_type_;
+    config.speech_encoder = std::unique_ptr<AudioEncoder>(mock_encoder_);
+    red_.reset(new AudioEncoderCopyRed(std::move(config), field_trials_));
+    memset(audio_, 0, sizeof(audio_));
+    EXPECT_CALL(*mock_encoder_, NumChannels()).WillRepeatedly(Return(1U));
+    EXPECT_CALL(*mock_encoder_, SampleRateHz())
+        .WillRepeatedly(Return(sample_rate_hz_));
+  }
+
+  void TearDown() override { red_.reset(); }
+
+  void Encode() {
+    ASSERT_TRUE(red_.get() != NULL);
+    encoded_.Clear();
+    encoded_info_ = red_->Encode(
+        timestamp_,
+        rtc::ArrayView<const int16_t>(audio_, num_audio_samples_10ms),
+        &encoded_);
+    timestamp_ += rtc::checked_cast<uint32_t>(num_audio_samples_10ms);
+  }
+
+  test::ScopedKeyValueConfig field_trials_;
+  MockAudioEncoder* mock_encoder_;
+  std::unique_ptr<AudioEncoderCopyRed> red_;
+  uint32_t timestamp_;
+  int16_t audio_[kMaxNumSamples];
+  const int sample_rate_hz_;
+  size_t num_audio_samples_10ms;
+  rtc::Buffer encoded_;
+  AudioEncoder::EncodedInfo encoded_info_;
+  const int red_payload_type_;
+};
+
+TEST_F(AudioEncoderCopyRedTest, CreateAndDestroy) {}
+
+TEST_F(AudioEncoderCopyRedTest, CheckSampleRatePropagation) {
+  EXPECT_CALL(*mock_encoder_, SampleRateHz()).WillOnce(Return(17));
+  EXPECT_EQ(17, red_->SampleRateHz());
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckNumChannelsPropagation) {
+  EXPECT_CALL(*mock_encoder_, NumChannels()).WillOnce(Return(17U));
+  EXPECT_EQ(17U, red_->NumChannels());
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckFrameSizePropagation) {
+  EXPECT_CALL(*mock_encoder_, Num10MsFramesInNextPacket())
+      .WillOnce(Return(17U));
+  EXPECT_EQ(17U, red_->Num10MsFramesInNextPacket());
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckMaxFrameSizePropagation) {
+  EXPECT_CALL(*mock_encoder_, Max10MsFramesInAPacket()).WillOnce(Return(17U));
+  EXPECT_EQ(17U, red_->Max10MsFramesInAPacket());
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckTargetAudioBitratePropagation) {
+  EXPECT_CALL(*mock_encoder_,
+              OnReceivedUplinkBandwidth(4711, absl::optional<int64_t>()));
+  red_->OnReceivedUplinkBandwidth(4711, absl::nullopt);
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckPacketLossFractionPropagation) {
+  EXPECT_CALL(*mock_encoder_, OnReceivedUplinkPacketLossFraction(0.5));
+  red_->OnReceivedUplinkPacketLossFraction(0.5);
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckGetFrameLengthRangePropagation) {
+  auto expected_range =
+      std::make_pair(TimeDelta::Millis(20), TimeDelta::Millis(20));
+  EXPECT_CALL(*mock_encoder_, GetFrameLengthRange())
+      .WillRepeatedly(Return(absl::make_optional(expected_range)));
+  EXPECT_THAT(red_->GetFrameLengthRange(), Optional(Eq(expected_range)));
+}
+
+// Checks that the an Encode() call is immediately propagated to the speech
+// encoder.
+TEST_F(AudioEncoderCopyRedTest, CheckImmediateEncode) {
+  // Interleaving the EXPECT_CALL sequence with expectations on the MockFunction
+  // check ensures that exactly one call to EncodeImpl happens in each
+  // Encode call.
+  InSequence s;
+  MockFunction<void(int check_point_id)> check;
+  for (int i = 1; i <= 6; ++i) {
+    EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+        .WillRepeatedly(Return(AudioEncoder::EncodedInfo()));
+    EXPECT_CALL(check, Call(i));
+    Encode();
+    check.Call(i);
+  }
+}
+
+// Checks that no output is produced if the underlying codec doesn't emit any
+// new data, even if the RED codec is loaded with a secondary encoding.
+TEST_F(AudioEncoderCopyRedTest, CheckNoOutput) {
+  static const size_t kEncodedSize = 17;
+  static const size_t kHeaderLenBytes = 5;
+  {
+    InSequence s;
+    EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(kEncodedSize)))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(0)))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(kEncodedSize)));
+  }
+
+  // Start with one Encode() call that will produce output.
+  Encode();
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  EXPECT_EQ(0u, encoded_info_.redundant.size());
+  EXPECT_EQ(kEncodedSize + kRedLastHeaderLength, encoded_info_.encoded_bytes);
+
+  // Next call to the speech encoder will not produce any output.
+  Encode();
+  EXPECT_EQ(0u, encoded_info_.encoded_bytes);
+
+  // Final call to the speech encoder will produce output.
+  Encode();
+  EXPECT_EQ(2 * kEncodedSize + kHeaderLenBytes, encoded_info_.encoded_bytes);
+  ASSERT_EQ(2u, encoded_info_.redundant.size());
+}
+
+// Checks that the correct payload sizes are populated into the redundancy
+// information for a redundancy level of 1.
+TEST_F(AudioEncoderCopyRedTest, CheckPayloadSizes1) {
+  // Let the mock encoder return payload sizes 1, 2, 3, ..., 10 for the sequence
+  // of calls.
+  static const int kNumPackets = 10;
+  InSequence s;
+  for (int encode_size = 1; encode_size <= kNumPackets; ++encode_size) {
+    EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(encode_size)));
+  }
+
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  Encode();
+  EXPECT_EQ(0u, encoded_info_.redundant.size());
+  EXPECT_EQ(kRedLastHeaderLength + 1u, encoded_info_.encoded_bytes);
+
+  for (size_t i = 2; i <= kNumPackets; ++i) {
+    Encode();
+    ASSERT_EQ(2u, encoded_info_.redundant.size());
+    EXPECT_EQ(i, encoded_info_.redundant[1].encoded_bytes);
+    EXPECT_EQ(i - 1, encoded_info_.redundant[0].encoded_bytes);
+    EXPECT_EQ(5 + i + (i - 1), encoded_info_.encoded_bytes);
+  }
+}
+
+// Checks that the correct payload sizes are populated into the redundancy
+// information for a redundancy level of 0.
+TEST_F(AudioEncoderCopyRedTest, CheckPayloadSizes0) {
+  webrtc::test::ScopedKeyValueConfig field_trials(
+      field_trials_, "WebRTC-Audio-Red-For-Opus/Enabled-0/");
+  // Recreate the RED encoder to take the new field trial setting into account.
+  AudioEncoderCopyRed::Config config;
+  config.payload_type = red_payload_type_;
+  config.speech_encoder = std::move(red_->ReclaimContainedEncoders()[0]);
+  red_.reset(new AudioEncoderCopyRed(std::move(config), field_trials));
+
+  // Let the mock encoder return payload sizes 1, 2, 3, ..., 10 for the sequence
+  // of calls.
+  static const int kNumPackets = 10;
+  InSequence s;
+  for (int encode_size = 1; encode_size <= kNumPackets; ++encode_size) {
+    EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(encode_size)));
+  }
+
+  for (size_t i = 1; i <= kNumPackets; ++i) {
+    Encode();
+    ASSERT_EQ(0u, encoded_info_.redundant.size());
+    EXPECT_EQ(1 + i, encoded_info_.encoded_bytes);
+  }
+}
+// Checks that the correct payload sizes are populated into the redundancy
+// information for a redundancy level of 2.
+TEST_F(AudioEncoderCopyRedTest, CheckPayloadSizes2) {
+  webrtc::test::ScopedKeyValueConfig field_trials(
+      field_trials_, "WebRTC-Audio-Red-For-Opus/Enabled-2/");
+  // Recreate the RED encoder to take the new field trial setting into account.
+  AudioEncoderCopyRed::Config config;
+  config.payload_type = red_payload_type_;
+  config.speech_encoder = std::move(red_->ReclaimContainedEncoders()[0]);
+  red_.reset(new AudioEncoderCopyRed(std::move(config), field_trials));
+
+  // Let the mock encoder return payload sizes 1, 2, 3, ..., 10 for the sequence
+  // of calls.
+  static const int kNumPackets = 10;
+  InSequence s;
+  for (int encode_size = 1; encode_size <= kNumPackets; ++encode_size) {
+    EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(encode_size)));
+  }
+
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  Encode();
+  EXPECT_EQ(0u, encoded_info_.redundant.size());
+  EXPECT_EQ(kRedLastHeaderLength + 1u, encoded_info_.encoded_bytes);
+
+  // Second call is also special since it does not include a tertiary
+  // payload.
+  Encode();
+  EXPECT_EQ(2u, encoded_info_.redundant.size());
+  EXPECT_EQ(8u, encoded_info_.encoded_bytes);
+
+  for (size_t i = 3; i <= kNumPackets; ++i) {
+    Encode();
+    ASSERT_EQ(3u, encoded_info_.redundant.size());
+    EXPECT_EQ(i, encoded_info_.redundant[2].encoded_bytes);
+    EXPECT_EQ(i - 1, encoded_info_.redundant[1].encoded_bytes);
+    EXPECT_EQ(i - 2, encoded_info_.redundant[0].encoded_bytes);
+    EXPECT_EQ(9 + i + (i - 1) + (i - 2), encoded_info_.encoded_bytes);
+  }
+}
+
+// Checks that the correct payload sizes are populated into the redundancy
+// information for a redundancy level of 3.
+TEST_F(AudioEncoderCopyRedTest, CheckPayloadSizes3) {
+  webrtc::test::ScopedKeyValueConfig field_trials(
+      field_trials_, "WebRTC-Audio-Red-For-Opus/Enabled-3/");
+  // Recreate the RED encoder to take the new field trial setting into account.
+  AudioEncoderCopyRed::Config config;
+  config.payload_type = red_payload_type_;
+  config.speech_encoder = std::move(red_->ReclaimContainedEncoders()[0]);
+  red_.reset(new AudioEncoderCopyRed(std::move(config), field_trials_));
+
+  // Let the mock encoder return payload sizes 1, 2, 3, ..., 10 for the sequence
+  // of calls.
+  static const int kNumPackets = 10;
+  InSequence s;
+  for (int encode_size = 1; encode_size <= kNumPackets; ++encode_size) {
+    EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+        .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(encode_size)));
+  }
+
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  Encode();
+  EXPECT_EQ(0u, encoded_info_.redundant.size());
+  EXPECT_EQ(kRedLastHeaderLength + 1u, encoded_info_.encoded_bytes);
+
+  // Second call is also special since it does not include a tertiary
+  // payload.
+  Encode();
+  EXPECT_EQ(2u, encoded_info_.redundant.size());
+  EXPECT_EQ(8u, encoded_info_.encoded_bytes);
+
+  // Third call is also special since it does not include a quaternary
+  // payload.
+  Encode();
+  EXPECT_EQ(3u, encoded_info_.redundant.size());
+  EXPECT_EQ(15u, encoded_info_.encoded_bytes);
+
+  for (size_t i = 4; i <= kNumPackets; ++i) {
+    Encode();
+    ASSERT_EQ(4u, encoded_info_.redundant.size());
+    EXPECT_EQ(i, encoded_info_.redundant[3].encoded_bytes);
+    EXPECT_EQ(i - 1, encoded_info_.redundant[2].encoded_bytes);
+    EXPECT_EQ(i - 2, encoded_info_.redundant[1].encoded_bytes);
+    EXPECT_EQ(i - 3, encoded_info_.redundant[0].encoded_bytes);
+    EXPECT_EQ(13 + i + (i - 1) + (i - 2) + (i - 3),
+              encoded_info_.encoded_bytes);
+  }
+}
+
+// Checks that packets encoded larger than REDs 1024 maximum are returned as-is.
+TEST_F(AudioEncoderCopyRedTest, VeryLargePacket) {
+  AudioEncoder::EncodedInfo info;
+  info.payload_type = 63;
+  info.encoded_bytes =
+      1111;  // Must be > 1024 which is the maximum size encodable by RED.
+  info.encoded_timestamp = timestamp_;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+
+  Encode();
+  ASSERT_EQ(0u, encoded_info_.redundant.size());
+  ASSERT_EQ(info.encoded_bytes, encoded_info_.encoded_bytes);
+  ASSERT_EQ(info.payload_type, encoded_info_.payload_type);
+}
+
+// Checks that the correct timestamps are returned.
+TEST_F(AudioEncoderCopyRedTest, CheckTimestamps) {
+  uint32_t primary_timestamp = timestamp_;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 17;
+  info.encoded_timestamp = timestamp_;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  Encode();
+  EXPECT_EQ(primary_timestamp, encoded_info_.encoded_timestamp);
+
+  uint32_t secondary_timestamp = primary_timestamp;
+  primary_timestamp = timestamp_;
+  info.encoded_timestamp = timestamp_;
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+
+  Encode();
+  ASSERT_EQ(2u, encoded_info_.redundant.size());
+  EXPECT_EQ(primary_timestamp, encoded_info_.redundant[1].encoded_timestamp);
+  EXPECT_EQ(secondary_timestamp, encoded_info_.redundant[0].encoded_timestamp);
+  EXPECT_EQ(primary_timestamp, encoded_info_.encoded_timestamp);
+}
+
+// Checks that the primary and secondary payloads are written correctly.
+TEST_F(AudioEncoderCopyRedTest, CheckPayloads) {
+  // Let the mock encoder write payloads with increasing values. The first
+  // payload will have values 0, 1, 2, ..., kPayloadLenBytes - 1.
+  static const size_t kPayloadLenBytes = 5;
+  static const size_t kHeaderLenBytes = 5;
+  uint8_t payload[kPayloadLenBytes];
+  for (uint8_t i = 0; i < kPayloadLenBytes; ++i) {
+    payload[i] = i;
+  }
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillRepeatedly(Invoke(MockAudioEncoder::CopyEncoding(payload)));
+
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  Encode();
+  EXPECT_EQ(kRedLastHeaderLength + kPayloadLenBytes,
+            encoded_info_.encoded_bytes);
+  for (size_t i = 0; i < kPayloadLenBytes; ++i) {
+    EXPECT_EQ(i, encoded_.data()[kRedLastHeaderLength + i]);
+  }
+
+  for (int j = 0; j < 1; ++j) {
+    // Increment all values of the payload by 10.
+    for (size_t i = 0; i < kPayloadLenBytes; ++i)
+      payload[i] += 10;
+
+    Encode();
+    ASSERT_EQ(2u, encoded_info_.redundant.size());
+    EXPECT_EQ(kPayloadLenBytes, encoded_info_.redundant[0].encoded_bytes);
+    EXPECT_EQ(kPayloadLenBytes, encoded_info_.redundant[1].encoded_bytes);
+    for (size_t i = 0; i < kPayloadLenBytes; ++i) {
+      // Check secondary payload.
+      EXPECT_EQ(j * 10 + i, encoded_.data()[kHeaderLenBytes + i]);
+
+      // Check primary payload.
+      EXPECT_EQ((j + 1) * 10 + i,
+                encoded_.data()[kHeaderLenBytes + i + kPayloadLenBytes]);
+    }
+  }
+}
+
+// Checks correct propagation of payload type.
+TEST_F(AudioEncoderCopyRedTest, CheckPayloadType) {
+  const int primary_payload_type = red_payload_type_ + 1;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 17;
+  info.payload_type = primary_payload_type;
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+
+  // First call is a special case, since it does not include a secondary
+  // payload.
+  Encode();
+  ASSERT_EQ(0u, encoded_info_.redundant.size());
+
+  const int secondary_payload_type = red_payload_type_ + 2;
+  info.payload_type = secondary_payload_type;
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+
+  Encode();
+  ASSERT_EQ(2u, encoded_info_.redundant.size());
+  EXPECT_EQ(secondary_payload_type, encoded_info_.redundant[1].payload_type);
+  EXPECT_EQ(primary_payload_type, encoded_info_.redundant[0].payload_type);
+  EXPECT_EQ(red_payload_type_, encoded_info_.payload_type);
+}
+
+TEST_F(AudioEncoderCopyRedTest, CheckRFC2198Header) {
+  const int primary_payload_type = red_payload_type_ + 1;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 10;
+  info.encoded_timestamp = timestamp_;
+  info.payload_type = primary_payload_type;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();
+  info.encoded_timestamp = timestamp_;  // update timestamp.
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Second call will produce a redundant encoding.
+
+  EXPECT_EQ(encoded_.size(),
+            5u + 2 * 10u);  // header size + two encoded payloads.
+  EXPECT_EQ(encoded_[0], primary_payload_type | 0x80);
+
+  uint32_t timestamp_delta = encoded_info_.encoded_timestamp -
+                             encoded_info_.redundant[0].encoded_timestamp;
+  // Timestamp delta is encoded as a 14 bit value.
+  EXPECT_EQ(encoded_[1], timestamp_delta >> 6);
+  EXPECT_EQ(static_cast<uint8_t>(encoded_[2] >> 2), timestamp_delta & 0x3f);
+  // Redundant length is encoded as 10 bit value.
+  EXPECT_EQ(encoded_[2] & 0x3u, encoded_info_.redundant[1].encoded_bytes >> 8);
+  EXPECT_EQ(encoded_[3], encoded_info_.redundant[1].encoded_bytes & 0xff);
+  EXPECT_EQ(encoded_[4], primary_payload_type);
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Third call will produce a redundant encoding with double
+             // redundancy.
+
+  EXPECT_EQ(encoded_.size(),
+            5u + 2 * 10u);  // header size + two encoded payloads.
+  EXPECT_EQ(encoded_[0], primary_payload_type | 0x80);
+
+  timestamp_delta = encoded_info_.encoded_timestamp -
+                    encoded_info_.redundant[0].encoded_timestamp;
+  // Timestamp delta is encoded as a 14 bit value.
+  EXPECT_EQ(encoded_[1], timestamp_delta >> 6);
+  EXPECT_EQ(static_cast<uint8_t>(encoded_[2] >> 2), timestamp_delta & 0x3f);
+  // Redundant length is encoded as 10 bit value.
+  EXPECT_EQ(encoded_[2] & 0x3u, encoded_info_.redundant[1].encoded_bytes >> 8);
+  EXPECT_EQ(encoded_[3], encoded_info_.redundant[1].encoded_bytes & 0xff);
+
+  EXPECT_EQ(encoded_[4], primary_payload_type);
+  timestamp_delta = encoded_info_.encoded_timestamp -
+                    encoded_info_.redundant[1].encoded_timestamp;
+}
+
+// Variant with a redundancy of 0.
+TEST_F(AudioEncoderCopyRedTest, CheckRFC2198Header0) {
+  webrtc::test::ScopedKeyValueConfig field_trials(
+      field_trials_, "WebRTC-Audio-Red-For-Opus/Enabled-0/");
+  // Recreate the RED encoder to take the new field trial setting into account.
+  AudioEncoderCopyRed::Config config;
+  config.payload_type = red_payload_type_;
+  config.speech_encoder = std::move(red_->ReclaimContainedEncoders()[0]);
+  red_.reset(new AudioEncoderCopyRed(std::move(config), field_trials));
+
+  const int primary_payload_type = red_payload_type_ + 1;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 10;
+  info.encoded_timestamp = timestamp_;
+  info.payload_type = primary_payload_type;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();
+  info.encoded_timestamp = timestamp_;  // update timestamp.
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Second call will not produce a redundant encoding.
+
+  EXPECT_EQ(encoded_.size(),
+            1u + 1 * 10u);  // header size + one encoded payloads.
+  EXPECT_EQ(encoded_[0], primary_payload_type);
+}
+// Variant with a redundancy of 2.
+TEST_F(AudioEncoderCopyRedTest, CheckRFC2198Header2) {
+  webrtc::test::ScopedKeyValueConfig field_trials(
+      field_trials_, "WebRTC-Audio-Red-For-Opus/Enabled-2/");
+  // Recreate the RED encoder to take the new field trial setting into account.
+  AudioEncoderCopyRed::Config config;
+  config.payload_type = red_payload_type_;
+  config.speech_encoder = std::move(red_->ReclaimContainedEncoders()[0]);
+  red_.reset(new AudioEncoderCopyRed(std::move(config), field_trials));
+
+  const int primary_payload_type = red_payload_type_ + 1;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 10;
+  info.encoded_timestamp = timestamp_;
+  info.payload_type = primary_payload_type;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();
+  info.encoded_timestamp = timestamp_;  // update timestamp.
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Second call will produce a redundant encoding.
+
+  EXPECT_EQ(encoded_.size(),
+            5u + 2 * 10u);  // header size + two encoded payloads.
+  EXPECT_EQ(encoded_[0], primary_payload_type | 0x80);
+
+  uint32_t timestamp_delta = encoded_info_.encoded_timestamp -
+                             encoded_info_.redundant[0].encoded_timestamp;
+  // Timestamp delta is encoded as a 14 bit value.
+  EXPECT_EQ(encoded_[1], timestamp_delta >> 6);
+  EXPECT_EQ(static_cast<uint8_t>(encoded_[2] >> 2), timestamp_delta & 0x3f);
+  // Redundant length is encoded as 10 bit value.
+  EXPECT_EQ(encoded_[2] & 0x3u, encoded_info_.redundant[1].encoded_bytes >> 8);
+  EXPECT_EQ(encoded_[3], encoded_info_.redundant[1].encoded_bytes & 0xff);
+  EXPECT_EQ(encoded_[4], primary_payload_type);
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Third call will produce a redundant encoding with double
+             // redundancy.
+
+  EXPECT_EQ(encoded_.size(),
+            9u + 3 * 10u);  // header size + three encoded payloads.
+  EXPECT_EQ(encoded_[0], primary_payload_type | 0x80);
+
+  timestamp_delta = encoded_info_.encoded_timestamp -
+                    encoded_info_.redundant[0].encoded_timestamp;
+  // Timestamp delta is encoded as a 14 bit value.
+  EXPECT_EQ(encoded_[1], timestamp_delta >> 6);
+  EXPECT_EQ(static_cast<uint8_t>(encoded_[2] >> 2), timestamp_delta & 0x3f);
+  // Redundant length is encoded as 10 bit value.
+  EXPECT_EQ(encoded_[2] & 0x3u, encoded_info_.redundant[1].encoded_bytes >> 8);
+  EXPECT_EQ(encoded_[3], encoded_info_.redundant[1].encoded_bytes & 0xff);
+
+  EXPECT_EQ(encoded_[4], primary_payload_type | 0x80);
+  timestamp_delta = encoded_info_.encoded_timestamp -
+                    encoded_info_.redundant[1].encoded_timestamp;
+  // Timestamp delta is encoded as a 14 bit value.
+  EXPECT_EQ(encoded_[5], timestamp_delta >> 6);
+  EXPECT_EQ(static_cast<uint8_t>(encoded_[6] >> 2), timestamp_delta & 0x3f);
+  // Redundant length is encoded as 10 bit value.
+  EXPECT_EQ(encoded_[6] & 0x3u, encoded_info_.redundant[1].encoded_bytes >> 8);
+  EXPECT_EQ(encoded_[7], encoded_info_.redundant[1].encoded_bytes & 0xff);
+  EXPECT_EQ(encoded_[8], primary_payload_type);
+}
+
+TEST_F(AudioEncoderCopyRedTest, RespectsPayloadMTU) {
+  const int primary_payload_type = red_payload_type_ + 1;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 600;
+  info.encoded_timestamp = timestamp_;
+  info.payload_type = primary_payload_type;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();
+  info.encoded_timestamp = timestamp_;  // update timestamp.
+  info.encoded_bytes = 500;
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Second call will produce a redundant encoding.
+
+  EXPECT_EQ(encoded_.size(), 5u + 600u + 500u);
+
+  info.encoded_timestamp = timestamp_;  // update timestamp.
+  info.encoded_bytes = 400;
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();  // Third call will drop the oldest packet.
+  EXPECT_EQ(encoded_.size(), 5u + 500u + 400u);
+}
+
+TEST_F(AudioEncoderCopyRedTest, LargeTimestampGap) {
+  const int primary_payload_type = red_payload_type_ + 1;
+  AudioEncoder::EncodedInfo info;
+  info.encoded_bytes = 100;
+  info.encoded_timestamp = timestamp_;
+  info.payload_type = primary_payload_type;
+
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();
+  // Update timestamp to simulate a 400ms gap like the one
+  // opus DTX causes.
+  timestamp_ += 19200;
+  info.encoded_timestamp = timestamp_;  // update timestamp.
+  info.encoded_bytes = 200;
+  EXPECT_CALL(*mock_encoder_, EncodeImpl(_, _, _))
+      .WillOnce(Invoke(MockAudioEncoder::FakeEncoding(info)));
+  Encode();
+
+  // The old packet will be dropped.
+  EXPECT_EQ(encoded_.size(), 1u + 200u);
+}
+
+#if GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+// This test fixture tests various error conditions that makes the
+// AudioEncoderCng die via CHECKs.
+class AudioEncoderCopyRedDeathTest : public AudioEncoderCopyRedTest {
+ protected:
+  AudioEncoderCopyRedDeathTest() : AudioEncoderCopyRedTest() {}
+};
+
+TEST_F(AudioEncoderCopyRedDeathTest, WrongFrameSize) {
+  num_audio_samples_10ms *= 2;  // 20 ms frame.
+  RTC_EXPECT_DEATH(Encode(), "");
+  num_audio_samples_10ms = 0;  // Zero samples.
+  RTC_EXPECT_DEATH(Encode(), "");
+}
+
+TEST_F(AudioEncoderCopyRedDeathTest, NullSpeechEncoder) {
+  test::ScopedKeyValueConfig field_trials;
+  AudioEncoderCopyRed* red = NULL;
+  AudioEncoderCopyRed::Config config;
+  config.speech_encoder = NULL;
+  RTC_EXPECT_DEATH(
+      red = new AudioEncoderCopyRed(std::move(config), field_trials),
+      "Speech encoder not provided.");
+  // The delete operation is needed to avoid leak reports from memcheck.
+  delete red;
+}
+
+#endif  // GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+}  // namespace webrtc