Account for simulcast hysteresis in padding rate calculation.

Bug: webrtc:10271
Change-Id: If0b0eb7d94fb1c892880ff4745f34c43fcdeee54
Reviewed-on: https://webrtc-review.googlesource.com/c/120661
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26527}

rtc_base/experiments/rate_control_settings_unittest.cc

@@ -0,0 +1,55 @@
+/*
+ *  Copyright 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 "rtc_base/experiments/rate_control_settings.h"
+
+#include "api/video_codecs/video_codec.h"
+#include "api/video_codecs/video_encoder_config.h"
+#include "test/field_trial.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+namespace {
+
+TEST(RateControlSettingsTest, LibvpxTrustedRateController) {
+  test::ScopedFieldTrials field_trials(
+      "WebRTC-VideoRateControl/trust_vp8:1,trust_vp9:0/");
+  const RateControlSettings rate_control_settings =
+      RateControlSettings::ParseFromFieldTrials();
+
+  EXPECT_TRUE(rate_control_settings.LibvpxVp8TrustedRateController());
+  EXPECT_FALSE(rate_control_settings.LibvpxVp9TrustedRateController());
+}
+
+TEST(RateControlSettingsTest, GetSimulcastHysteresisFactor) {
+  test::ScopedFieldTrials field_trials(
+      "WebRTC-VideoRateControl/"
+      "video_hysteresis:1.2,screenshare_hysteresis:1.4/");
+  const RateControlSettings rate_control_settings =
+      RateControlSettings::ParseFromFieldTrials();
+
+  EXPECT_EQ(rate_control_settings.GetSimulcastHysteresisFactor(
+                VideoCodecMode::kRealtimeVideo),
+            1.2);
+  EXPECT_EQ(rate_control_settings.GetSimulcastHysteresisFactor(
+                VideoEncoderConfig::ContentType::kRealtimeVideo),
+            1.2);
+  EXPECT_EQ(rate_control_settings.GetSimulcastHysteresisFactor(
+                VideoCodecMode::kScreensharing),
+            1.4);
+  EXPECT_EQ(rate_control_settings.GetSimulcastHysteresisFactor(
+                VideoEncoderConfig::ContentType::kScreen),
+            1.4);
+}
+
+}  // namespace
+
+}  // namespace webrtc