Reland of "Log audio network adapter decisions in event log."

webrtc/modules/audio_coding/audio_network_adaptor/event_log_writer_unittest.cc

Index: webrtc/modules/audio_coding/audio_network_adaptor/event_log_writer_unittest.cc
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/event_log_writer_unittest.cc b/webrtc/modules/audio_coding/audio_network_adaptor/event_log_writer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..289b8e2c7a21b472a5dcee86f4ee4531ca62a04b
--- /dev/null
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/event_log_writer_unittest.cc
@@ -0,0 +1,265 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <memory>
+
+#include "webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h"
+#include "webrtc/modules/audio_coding/audio_network_adaptor/event_log_writer.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+namespace {
+
+constexpr int kMinBitrateChangeBps = 5000;
+constexpr float kMinPacketLossChangeFraction = 0.5;
+constexpr float kMinBitrateChangeFraction = 0.25;
+
+constexpr int kHighBitrateBps = 70000;
+constexpr int kLowBitrateBps = 10000;
+constexpr int kFrameLengthMs = 60;
+constexpr bool kEnableFec = true;
+constexpr bool kEnableDtx = true;
+constexpr float kPacketLossFraction = 0.05f;
+constexpr size_t kNumChannels = 1;
+
+MATCHER_P(EncoderRuntimeConfigIs, config, "") {
+  return arg.bitrate_bps == config.bitrate_bps &&
+         arg.frame_length_ms == config.frame_length_ms &&
+         arg.uplink_packet_loss_fraction ==
+             config.uplink_packet_loss_fraction &&
+         arg.enable_fec == config.enable_fec &&
+         arg.enable_dtx == config.enable_dtx &&
+         arg.num_channels == config.num_channels;
+}
+
+struct EventLogWriterStates {
+  std::unique_ptr<EventLogWriter> event_log_writer;
+  std::unique_ptr<testing::StrictMock<MockRtcEventLog>> event_log;
+  AudioNetworkAdaptor::EncoderRuntimeConfig runtime_config;
+};
+
+EventLogWriterStates CreateEventLogWriter() {
+  EventLogWriterStates state;
+  state.event_log.reset(new testing::StrictMock<MockRtcEventLog>());
+  state.event_log_writer.reset(new EventLogWriter(
+      state.event_log.get(), kMinBitrateChangeBps, kMinBitrateChangeFraction,
+      kMinPacketLossChangeFraction));
+  state.runtime_config.bitrate_bps = rtc::Optional<int>(kHighBitrateBps);
+  state.runtime_config.frame_length_ms = rtc::Optional<int>(kFrameLengthMs);
+  state.runtime_config.uplink_packet_loss_fraction =
+      rtc::Optional<float>(kPacketLossFraction);
+  state.runtime_config.enable_fec = rtc::Optional<bool>(kEnableFec);
+  state.runtime_config.enable_dtx = rtc::Optional<bool>(kEnableDtx);
+  state.runtime_config.num_channels = rtc::Optional<size_t>(kNumChannels);
+  return state;
+}
+}  // namespace
+
+TEST(EventLogWriterTest, FirstConfigIsLogged) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, SameConfigIsNotLogged) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogFecStateChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+
+  state.runtime_config.enable_fec = rtc::Optional<bool>(!kEnableFec);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogDtxStateChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+
+  state.runtime_config.enable_dtx = rtc::Optional<bool>(!kEnableDtx);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogChannelChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+
+  state.runtime_config.num_channels = rtc::Optional<size_t>(kNumChannels + 1);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogFrameLengthChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+
+  state.runtime_config.frame_length_ms = rtc::Optional<int>(20);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, DoNotLogSmallBitrateChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  state.runtime_config.bitrate_bps =
+      rtc::Optional<int>(kHighBitrateBps + kMinBitrateChangeBps - 1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogLargeBitrateChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  // At high bitrate, the min fraction rule requires a larger change than the
+  // min change rule. We make sure that the min change rule applies.
+  RTC_DCHECK_GT(kHighBitrateBps * kMinBitrateChangeFraction,
+                kMinBitrateChangeBps);
+  state.runtime_config.bitrate_bps =
+      rtc::Optional<int>(kHighBitrateBps + kMinBitrateChangeBps);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogMinBitrateChangeFractionOnLowBitrateChange) {
+  auto state = CreateEventLogWriter();
+  state.runtime_config.bitrate_bps = rtc::Optional<int>(kLowBitrateBps);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  // At high bitrate, the min change rule requires a larger change than the min
+  // fraction rule. We make sure that the min fraction rule applies.
+  state.runtime_config.bitrate_bps = rtc::Optional<int>(
+      kLowBitrateBps + kLowBitrateBps * kMinBitrateChangeFraction);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, DoNotLogSmallPacketLossFractionChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  state.runtime_config.uplink_packet_loss_fraction = rtc::Optional<float>(
+      kPacketLossFraction + kMinPacketLossChangeFraction * kPacketLossFraction -
+      0.001f);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogLargePacketLossFractionChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  state.runtime_config.uplink_packet_loss_fraction = rtc::Optional<float>(
+      kPacketLossFraction + kMinPacketLossChangeFraction * kPacketLossFraction);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogJustOnceOnMultipleChanges) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  state.runtime_config.uplink_packet_loss_fraction = rtc::Optional<float>(
+      kPacketLossFraction + kMinPacketLossChangeFraction * kPacketLossFraction);
+  state.runtime_config.frame_length_ms = rtc::Optional<int>(20);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+}
+
+TEST(EventLogWriterTest, LogAfterGradualChange) {
+  auto state = CreateEventLogWriter();
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  state.runtime_config.bitrate_bps =
+      rtc::Optional<int>(kHighBitrateBps + kMinBitrateChangeBps);
+  EXPECT_CALL(
+      *state.event_log,
+      LogAudioNetworkAdaptation(EncoderRuntimeConfigIs(state.runtime_config)))
+      .Times(1);
+  for (int bitrate_bps = kHighBitrateBps;
+       bitrate_bps <= kHighBitrateBps + kMinBitrateChangeBps; bitrate_bps++) {
+    state.runtime_config.bitrate_bps = rtc::Optional<int>(bitrate_bps);
+    state.event_log_writer->MaybeLogEncoderConfig(state.runtime_config);
+  }
+}
+}  // namespace webrtc