video/encoder_overshoot_detector_unittest.cc - src/ - Git at Google

 /*
  *  Copyright (c) 2019 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 "video/encoder_overshoot_detector.h"

 #include <string>

 #include "api/units/data_rate.h"
 #include "rtc_base/fake_clock.h"
 #include "rtc_base/time_utils.h"
 #include "system_wrappers/include/metrics.h"
 #include "test/gtest.h"

 namespace webrtc {

 namespace {

 using ::testing::TestWithParam;
 using ::testing::ValuesIn;

 static std::string CodecTypeToHistogramSuffix(VideoCodecType codec) {
   switch (codec) {
     case kVideoCodecVP8:
       return "Vp8";
     case kVideoCodecVP9:
       return "Vp9";
     case kVideoCodecAV1:
       return "Av1";
     case kVideoCodecH264:
       return "H264";
     case kVideoCodecH265:
       return "H265";
     case kVideoCodecGeneric:
       return "Generic";
   }
 }

 struct TestParams {
   VideoCodecType codec_type;
   bool is_screenshare;
 };

 }  // namespace

 class EncoderOvershootDetectorTest : public TestWithParam<TestParams> {
  public:
   static constexpr int kDefaultBitrateBps = 300000;
   static constexpr double kDefaultFrameRateFps = 15;
   EncoderOvershootDetectorTest()
       : detector_(kWindowSizeMs,
                   GetParam().codec_type,
                   GetParam().is_screenshare),
         target_bitrate_(DataRate::BitsPerSec(kDefaultBitrateBps)),
         target_framerate_fps_(kDefaultFrameRateFps) {}

  protected:
   void SetUp() override { metrics::Reset(); }
   void RunConstantUtilizationTest(double actual_utilization_factor,
                                   double expected_utilization_factor,
                                   double allowed_error,
                                   int64_t test_duration_ms) {
     const int frame_size_bytes =
         static_cast<int>(actual_utilization_factor *
                          (target_bitrate_.bps() / target_framerate_fps_) / 8);
     detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
                             rtc::TimeMillis());

     if (rtc::TimeMillis() == 0) {
       // Encode a first frame which by definition has no overuse factor.
       detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
       clock_.AdvanceTime(TimeDelta::Seconds(1) / target_framerate_fps_);
     }

     int64_t runtime_us = 0;
     while (runtime_us < test_duration_ms * 1000) {
       detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
       runtime_us += rtc::kNumMicrosecsPerSec / target_framerate_fps_;
       clock_.AdvanceTime(TimeDelta::Seconds(1) / target_framerate_fps_);
     }

     // At constant utilization, both network and media utilization should be
     // close to expected.
     const absl::optional<double> network_utilization_factor =
         detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis());
     EXPECT_NEAR(network_utilization_factor.value_or(-1),
                 expected_utilization_factor, allowed_error);

     const absl::optional<double> media_utilization_factor =
         detector_.GetMediaRateUtilizationFactor(rtc::TimeMillis());
     EXPECT_NEAR(media_utilization_factor.value_or(-1),
                 expected_utilization_factor, allowed_error);
   }

   static constexpr int64_t kWindowSizeMs = 3000;
   EncoderOvershootDetector detector_;
   rtc::ScopedFakeClock clock_;
   DataRate target_bitrate_;
   double target_framerate_fps_;
 };

 TEST_P(EncoderOvershootDetectorTest, NoUtilizationIfNoRate) {
   const int frame_size_bytes = 1000;
   const int64_t time_interval_ms = 33;
   detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
                           rtc::TimeMillis());

   // No data points, can't determine overshoot rate.
   EXPECT_FALSE(
       detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis()).has_value());

   detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
   clock_.AdvanceTime(TimeDelta::Millis(time_interval_ms));
   EXPECT_TRUE(
       detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis()).has_value());
 }

 TEST_P(EncoderOvershootDetectorTest, OptimalSize) {
   // Optimally behaved encoder.
   // Allow some error margin due to rounding errors, eg due to frame
   // interval not being an integer.
   RunConstantUtilizationTest(1.0, 1.0, 0.01, kWindowSizeMs);
 }

 TEST_P(EncoderOvershootDetectorTest, Undershoot) {
   // Undershoot, reported utilization factor should be capped to 1.0 so
   // that we don't incorrectly boost encoder bitrate during movement.
   RunConstantUtilizationTest(0.5, 1.0, 0.00, kWindowSizeMs);
 }

 TEST_P(EncoderOvershootDetectorTest, Overshoot) {
   // Overshoot by 20%.
   // Allow some error margin due to rounding errors.
   RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs);
 }

 TEST_P(EncoderOvershootDetectorTest, ConstantOvershootVaryingRates) {
   // Overshoot by 20%, but vary framerate and bitrate.
   // Allow some error margin due to rounding errors.
   RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs);
   target_framerate_fps_ /= 2;
   RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
   target_bitrate_ = DataRate::BitsPerSec(target_bitrate_.bps() / 2);
   RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
 }

 TEST_P(EncoderOvershootDetectorTest, ConstantRateVaryingOvershoot) {
   // Overshoot by 10%, keep framerate and bitrate constant.
   // Allow some error margin due to rounding errors.
   RunConstantUtilizationTest(1.1, 1.1, 0.01, kWindowSizeMs);
   // Change overshoot to 20%, run for half window and expect overshoot
   // to be 15%.
   RunConstantUtilizationTest(1.2, 1.15, 0.01, kWindowSizeMs / 2);
   // Keep running at 20% overshoot, after window is full that should now
   // be the reported overshoot.
   RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
 }

 TEST_P(EncoderOvershootDetectorTest, PartialOvershoot) {
   const int ideal_frame_size_bytes =
       (target_bitrate_.bps() / target_framerate_fps_) / 8;
   detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
                           rtc::TimeMillis());

   // Test scenario with average bitrate matching the target bitrate, but
   // with some utilization factor penalty as the frames can't be paced out
   // on the network at the target rate.
   // Insert a series of four frames:
   //   1) 20% overshoot, not penalized as buffer if empty.
   //   2) 20% overshoot, the 20% overshoot from the first frame is penalized.
   //   3) 20% undershoot, negating the overshoot from the last frame.
   //   4) 20% undershoot, no penalty.
   // On average then utilization penalty is thus 5%.

   int64_t runtime_us = 0;
   int i = 0;
   while (runtime_us < kWindowSizeMs * rtc::kNumMicrosecsPerMillisec) {
     runtime_us += rtc::kNumMicrosecsPerSec / target_framerate_fps_;
     clock_.AdvanceTime(TimeDelta::Seconds(1) / target_framerate_fps_);
     int frame_size_bytes = (i++ % 4 < 2) ? (ideal_frame_size_bytes * 120) / 100
                                          : (ideal_frame_size_bytes * 80) / 100;
     detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
   }

   // Expect 5% overshoot for network rate, see above.
   const absl::optional<double> network_utilization_factor =
       detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis());
   EXPECT_NEAR(network_utilization_factor.value_or(-1), 1.05, 0.01);

   // Expect media rate to be on average correct.
   const absl::optional<double> media_utilization_factor =
       detector_.GetMediaRateUtilizationFactor(rtc::TimeMillis());
   EXPECT_NEAR(media_utilization_factor.value_or(-1), 1.00, 0.01);
 }

 TEST_P(EncoderOvershootDetectorTest, RecordsZeroErrorMetricWithNoOvershoot) {
   DataSize ideal_frame_size =
       target_bitrate_ / Frequency::Hertz(target_framerate_fps_);
   detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
                           rtc::TimeMillis());
   detector_.OnEncodedFrame(ideal_frame_size.bytes(), rtc::TimeMillis());
   detector_.Reset();

   const VideoCodecType codec = GetParam().codec_type;
   const bool is_screenshare = GetParam().is_screenshare;
   const std::string rmse_histogram_prefix =
       is_screenshare ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
                      : "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
   const std::string overshoot_histogram_prefix =
       is_screenshare ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
                      : "WebRTC.Video.EncodingBitrateOvershoot.";
   // RMSE and overshoot percent = 0, since we used ideal frame size.
   EXPECT_METRIC_EQ(1, metrics::NumSamples(rmse_histogram_prefix +
                                           CodecTypeToHistogramSuffix(codec)));
   EXPECT_METRIC_EQ(
       1, metrics::NumEvents(
              rmse_histogram_prefix + CodecTypeToHistogramSuffix(codec), 0));

   EXPECT_METRIC_EQ(1, metrics::NumSamples(overshoot_histogram_prefix +
                                           CodecTypeToHistogramSuffix(codec)));
   EXPECT_METRIC_EQ(1, metrics::NumEvents(overshoot_histogram_prefix +
                                              CodecTypeToHistogramSuffix(codec),
                                          0));
 }

 TEST_P(EncoderOvershootDetectorTest,
        RecordScreenshareZeroMetricWithNoOvershoot) {
   DataSize ideal_frame_size =
       target_bitrate_ / Frequency::Hertz(target_framerate_fps_);
   // Use target frame size with 50% overshoot.
   DataSize target_frame_size = ideal_frame_size * 3 / 2;
   detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
                           rtc::TimeMillis());
   detector_.OnEncodedFrame(target_frame_size.bytes(), rtc::TimeMillis());
   detector_.Reset();

   const VideoCodecType codec = GetParam().codec_type;
   const bool is_screenshare = GetParam().is_screenshare;
   const std::string rmse_histogram_prefix =
       is_screenshare ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
                      : "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
   const std::string overshoot_histogram_prefix =
       is_screenshare ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
                      : "WebRTC.Video.EncodingBitrateOvershoot.";
   // Use ideal_frame_size_kbits to represnt ideal_frame_size.bytes()*8/1000,
   // then rmse_in_kbps = ideal_frame_size_kbits/2
   // since we use target frame size with 50% overshoot.
   int64_t rmse_in_kbps = ideal_frame_size.bytes() * 8 / 1000 / 2;
   EXPECT_METRIC_EQ(1, metrics::NumSamples(rmse_histogram_prefix +
                                           CodecTypeToHistogramSuffix(codec)));
   EXPECT_METRIC_EQ(1, metrics::NumEvents(rmse_histogram_prefix +
                                              CodecTypeToHistogramSuffix(codec),
                                          rmse_in_kbps));
   // overshoot percent = 50, since we used ideal_frame_size * 3 / 2;
   EXPECT_METRIC_EQ(1, metrics::NumSamples(overshoot_histogram_prefix +
                                           CodecTypeToHistogramSuffix(codec)));
   EXPECT_METRIC_EQ(1, metrics::NumEvents(overshoot_histogram_prefix +
                                              CodecTypeToHistogramSuffix(codec),
                                          50));
 }

 INSTANTIATE_TEST_SUITE_P(
     PerCodecType,
     EncoderOvershootDetectorTest,
     ValuesIn<TestParams>({{VideoCodecType::kVideoCodecVP8, false},
                           {VideoCodecType::kVideoCodecVP8, true},
                           {VideoCodecType::kVideoCodecVP9, false},
                           {VideoCodecType::kVideoCodecVP9, true},
                           {VideoCodecType::kVideoCodecAV1, false},
                           {VideoCodecType::kVideoCodecAV1, true},
                           {VideoCodecType::kVideoCodecH264, false},
                           {VideoCodecType::kVideoCodecH264, true},
                           {VideoCodecType::kVideoCodecH265, false},
                           {VideoCodecType::kVideoCodecH265, true}}));

 }  // namespace webrtc
	/*
	* Copyright (c) 2019 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 "video/encoder_overshoot_detector.h"

	#include <string>

	#include "api/units/data_rate.h"
	#include "rtc_base/fake_clock.h"
	#include "rtc_base/time_utils.h"
	#include "system_wrappers/include/metrics.h"
	#include "test/gtest.h"

	namespace webrtc {

	namespace {

	using ::testing::TestWithParam;
	using ::testing::ValuesIn;

	static std::string CodecTypeToHistogramSuffix(VideoCodecType codec) {
	switch (codec) {
	case kVideoCodecVP8:
	return "Vp8";
	case kVideoCodecVP9:
	return "Vp9";
	case kVideoCodecAV1:
	return "Av1";
	case kVideoCodecH264:
	return "H264";
	case kVideoCodecH265:
	return "H265";
	case kVideoCodecGeneric:
	return "Generic";
	}
	}

	struct TestParams {
	VideoCodecType codec_type;
	bool is_screenshare;
	};

	} // namespace

	class EncoderOvershootDetectorTest : public TestWithParam<TestParams> {
	public:
	static constexpr int kDefaultBitrateBps = 300000;
	static constexpr double kDefaultFrameRateFps = 15;
	EncoderOvershootDetectorTest()
	: detector_(kWindowSizeMs,
	GetParam().codec_type,
	GetParam().is_screenshare),
	target_bitrate_(DataRate::BitsPerSec(kDefaultBitrateBps)),
	target_framerate_fps_(kDefaultFrameRateFps) {}

	protected:
	void SetUp() override { metrics::Reset(); }
	void RunConstantUtilizationTest(double actual_utilization_factor,
	double expected_utilization_factor,
	double allowed_error,
	int64_t test_duration_ms) {
	const int frame_size_bytes =
	static_cast<int>(actual_utilization_factor *
	(target_bitrate_.bps() / target_framerate_fps_) / 8);
	detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
	rtc::TimeMillis());

	if (rtc::TimeMillis() == 0) {
	// Encode a first frame which by definition has no overuse factor.
	detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
	clock_.AdvanceTime(TimeDelta::Seconds(1) / target_framerate_fps_);
	}

	int64_t runtime_us = 0;
	while (runtime_us < test_duration_ms * 1000) {
	detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
	runtime_us += rtc::kNumMicrosecsPerSec / target_framerate_fps_;
	clock_.AdvanceTime(TimeDelta::Seconds(1) / target_framerate_fps_);
	}

	// At constant utilization, both network and media utilization should be
	// close to expected.
	const absl::optional<double> network_utilization_factor =
	detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis());
	EXPECT_NEAR(network_utilization_factor.value_or(-1),
	expected_utilization_factor, allowed_error);

	const absl::optional<double> media_utilization_factor =
	detector_.GetMediaRateUtilizationFactor(rtc::TimeMillis());
	EXPECT_NEAR(media_utilization_factor.value_or(-1),
	expected_utilization_factor, allowed_error);
	}

	static constexpr int64_t kWindowSizeMs = 3000;
	EncoderOvershootDetector detector_;
	rtc::ScopedFakeClock clock_;
	DataRate target_bitrate_;
	double target_framerate_fps_;
	};

	TEST_P(EncoderOvershootDetectorTest, NoUtilizationIfNoRate) {
	const int frame_size_bytes = 1000;
	const int64_t time_interval_ms = 33;
	detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
	rtc::TimeMillis());

	// No data points, can't determine overshoot rate.
	EXPECT_FALSE(
	detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis()).has_value());

	detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
	clock_.AdvanceTime(TimeDelta::Millis(time_interval_ms));
	EXPECT_TRUE(
	detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis()).has_value());
	}

	TEST_P(EncoderOvershootDetectorTest, OptimalSize) {
	// Optimally behaved encoder.
	// Allow some error margin due to rounding errors, eg due to frame
	// interval not being an integer.
	RunConstantUtilizationTest(1.0, 1.0, 0.01, kWindowSizeMs);
	}

	TEST_P(EncoderOvershootDetectorTest, Undershoot) {
	// Undershoot, reported utilization factor should be capped to 1.0 so
	// that we don't incorrectly boost encoder bitrate during movement.
	RunConstantUtilizationTest(0.5, 1.0, 0.00, kWindowSizeMs);
	}

	TEST_P(EncoderOvershootDetectorTest, Overshoot) {
	// Overshoot by 20%.
	// Allow some error margin due to rounding errors.
	RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs);
	}

	TEST_P(EncoderOvershootDetectorTest, ConstantOvershootVaryingRates) {
	// Overshoot by 20%, but vary framerate and bitrate.
	// Allow some error margin due to rounding errors.
	RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs);
	target_framerate_fps_ /= 2;
	RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
	target_bitrate_ = DataRate::BitsPerSec(target_bitrate_.bps() / 2);
	RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
	}

	TEST_P(EncoderOvershootDetectorTest, ConstantRateVaryingOvershoot) {
	// Overshoot by 10%, keep framerate and bitrate constant.
	// Allow some error margin due to rounding errors.
	RunConstantUtilizationTest(1.1, 1.1, 0.01, kWindowSizeMs);
	// Change overshoot to 20%, run for half window and expect overshoot
	// to be 15%.
	RunConstantUtilizationTest(1.2, 1.15, 0.01, kWindowSizeMs / 2);
	// Keep running at 20% overshoot, after window is full that should now
	// be the reported overshoot.
	RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
	}

	TEST_P(EncoderOvershootDetectorTest, PartialOvershoot) {
	const int ideal_frame_size_bytes =
	(target_bitrate_.bps() / target_framerate_fps_) / 8;
	detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
	rtc::TimeMillis());

	// Test scenario with average bitrate matching the target bitrate, but
	// with some utilization factor penalty as the frames can't be paced out
	// on the network at the target rate.
	// Insert a series of four frames:
	// 1) 20% overshoot, not penalized as buffer if empty.
	// 2) 20% overshoot, the 20% overshoot from the first frame is penalized.
	// 3) 20% undershoot, negating the overshoot from the last frame.
	// 4) 20% undershoot, no penalty.
	// On average then utilization penalty is thus 5%.

	int64_t runtime_us = 0;
	int i = 0;
	while (runtime_us < kWindowSizeMs * rtc::kNumMicrosecsPerMillisec) {
	runtime_us += rtc::kNumMicrosecsPerSec / target_framerate_fps_;
	clock_.AdvanceTime(TimeDelta::Seconds(1) / target_framerate_fps_);
	int frame_size_bytes = (i++ % 4 < 2) ? (ideal_frame_size_bytes * 120) / 100
	: (ideal_frame_size_bytes * 80) / 100;
	detector_.OnEncodedFrame(frame_size_bytes, rtc::TimeMillis());
	}

	// Expect 5% overshoot for network rate, see above.
	const absl::optional<double> network_utilization_factor =
	detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis());
	EXPECT_NEAR(network_utilization_factor.value_or(-1), 1.05, 0.01);

	// Expect media rate to be on average correct.
	const absl::optional<double> media_utilization_factor =
	detector_.GetMediaRateUtilizationFactor(rtc::TimeMillis());
	EXPECT_NEAR(media_utilization_factor.value_or(-1), 1.00, 0.01);
	}

	TEST_P(EncoderOvershootDetectorTest, RecordsZeroErrorMetricWithNoOvershoot) {
	DataSize ideal_frame_size =
	target_bitrate_ / Frequency::Hertz(target_framerate_fps_);
	detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
	rtc::TimeMillis());
	detector_.OnEncodedFrame(ideal_frame_size.bytes(), rtc::TimeMillis());
	detector_.Reset();

	const VideoCodecType codec = GetParam().codec_type;
	const bool is_screenshare = GetParam().is_screenshare;
	const std::string rmse_histogram_prefix =
	is_screenshare ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
	: "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
	const std::string overshoot_histogram_prefix =
	is_screenshare ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
	: "WebRTC.Video.EncodingBitrateOvershoot.";
	// RMSE and overshoot percent = 0, since we used ideal frame size.
	EXPECT_METRIC_EQ(1, metrics::NumSamples(rmse_histogram_prefix +
	CodecTypeToHistogramSuffix(codec)));
	EXPECT_METRIC_EQ(
	1, metrics::NumEvents(
	rmse_histogram_prefix + CodecTypeToHistogramSuffix(codec), 0));

	EXPECT_METRIC_EQ(1, metrics::NumSamples(overshoot_histogram_prefix +
	CodecTypeToHistogramSuffix(codec)));
	EXPECT_METRIC_EQ(1, metrics::NumEvents(overshoot_histogram_prefix +
	CodecTypeToHistogramSuffix(codec),
	0));
	}

	TEST_P(EncoderOvershootDetectorTest,
	RecordScreenshareZeroMetricWithNoOvershoot) {
	DataSize ideal_frame_size =
	target_bitrate_ / Frequency::Hertz(target_framerate_fps_);
	// Use target frame size with 50% overshoot.
	DataSize target_frame_size = ideal_frame_size * 3 / 2;
	detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
	rtc::TimeMillis());
	detector_.OnEncodedFrame(target_frame_size.bytes(), rtc::TimeMillis());
	detector_.Reset();

	const VideoCodecType codec = GetParam().codec_type;
	const bool is_screenshare = GetParam().is_screenshare;
	const std::string rmse_histogram_prefix =
	is_screenshare ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
	: "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
	const std::string overshoot_histogram_prefix =
	is_screenshare ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
	: "WebRTC.Video.EncodingBitrateOvershoot.";
	// Use ideal_frame_size_kbits to represnt ideal_frame_size.bytes()*8/1000,
	// then rmse_in_kbps = ideal_frame_size_kbits/2
	// since we use target frame size with 50% overshoot.
	int64_t rmse_in_kbps = ideal_frame_size.bytes() * 8 / 1000 / 2;
	EXPECT_METRIC_EQ(1, metrics::NumSamples(rmse_histogram_prefix +
	CodecTypeToHistogramSuffix(codec)));
	EXPECT_METRIC_EQ(1, metrics::NumEvents(rmse_histogram_prefix +
	CodecTypeToHistogramSuffix(codec),
	rmse_in_kbps));
	// overshoot percent = 50, since we used ideal_frame_size * 3 / 2;
	EXPECT_METRIC_EQ(1, metrics::NumSamples(overshoot_histogram_prefix +
	CodecTypeToHistogramSuffix(codec)));
	EXPECT_METRIC_EQ(1, metrics::NumEvents(overshoot_histogram_prefix +
	CodecTypeToHistogramSuffix(codec),
	50));
	}

	INSTANTIATE_TEST_SUITE_P(
	PerCodecType,
	EncoderOvershootDetectorTest,
	ValuesIn<TestParams>({{VideoCodecType::kVideoCodecVP8, false},
	{VideoCodecType::kVideoCodecVP8, true},
	{VideoCodecType::kVideoCodecVP9, false},
	{VideoCodecType::kVideoCodecVP9, true},
	{VideoCodecType::kVideoCodecAV1, false},
	{VideoCodecType::kVideoCodecAV1, true},
	{VideoCodecType::kVideoCodecH264, false},
	{VideoCodecType::kVideoCodecH264, true},
	{VideoCodecType::kVideoCodecH265, false},
	{VideoCodecType::kVideoCodecH265, true}}));

	} // namespace webrtc