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/*
* Copyright (c) 2020 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 "call/adaptation/video_stream_adapter.h"
#include <cstddef>
#include <optional>
#include <string>
#include "api/adaptation/resource.h"
#include "api/rtp_parameters.h"
#include "api/scoped_refptr.h"
#include "api/video/video_adaptation_counters.h"
#include "api/video_codecs/video_encoder.h"
#include "call/adaptation/adaptation_constraint.h"
#include "call/adaptation/test/fake_frame_rate_provider.h"
#include "call/adaptation/test/fake_resource.h"
#include "call/adaptation/test/fake_video_stream_input_state_provider.h"
#include "call/adaptation/video_source_restrictions.h"
#include "call/adaptation/video_stream_input_state.h"
#include "rtc_base/checks.h"
#include "rtc_base/string_encode.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/scoped_key_value_config.h"
namespace webrtc {
using ::testing::_;
using ::testing::Return;
namespace {
const int kBalancedHighResolutionPixels = 1280 * 720;
const int kBalancedHighFrameRateFps = 30;
const int kBalancedMediumResolutionPixels = 640 * 480;
const int kBalancedMediumFrameRateFps = 20;
const int kBalancedLowResolutionPixels = 320 * 240;
const int kBalancedLowFrameRateFps = 10;
std::string BalancedFieldTrialConfig() {
return "WebRTC-Video-BalancedDegradationSettings/pixels:" +
absl::StrCat(kBalancedLowResolutionPixels) + "|" +
absl::StrCat(kBalancedMediumResolutionPixels) + "|" +
absl::StrCat(kBalancedHighResolutionPixels) +
",fps:" + absl::StrCat(kBalancedLowFrameRateFps) + "|" +
absl::StrCat(kBalancedMediumFrameRateFps) + "|" +
absl::StrCat(kBalancedHighFrameRateFps) + "/";
}
// Responsible for adjusting the inputs to VideoStreamAdapter (SetInput), such
// as pixels and frame rate, according to the most recent source restrictions.
// This helps tests that apply adaptations multiple times: if the input is not
// adjusted between adaptations, the subsequent adaptations fail with
// kAwaitingPreviousAdaptation.
class FakeVideoStream {
public:
FakeVideoStream(VideoStreamAdapter* adapter,
FakeVideoStreamInputStateProvider* provider,
int input_pixels,
int input_fps,
int min_pixels_per_frame)
: adapter_(adapter),
provider_(provider),
input_pixels_(input_pixels),
input_fps_(input_fps),
min_pixels_per_frame_(min_pixels_per_frame) {
provider_->SetInputState(input_pixels_, input_fps_, min_pixels_per_frame_);
}
int input_pixels() const { return input_pixels_; }
int input_fps() const { return input_fps_; }
// Performs ApplyAdaptation() followed by SetInput() with input pixels and
// frame rate adjusted according to the resulting restrictions.
void ApplyAdaptation(Adaptation adaptation) {
adapter_->ApplyAdaptation(adaptation, nullptr);
// Update input pixels and fps according to the resulting restrictions.
auto restrictions = adapter_->source_restrictions();
if (restrictions.target_pixels_per_frame().has_value()) {
RTC_DCHECK(!restrictions.max_pixels_per_frame().has_value() ||
restrictions.max_pixels_per_frame().value() >=
restrictions.target_pixels_per_frame().value());
input_pixels_ = restrictions.target_pixels_per_frame().value();
} else if (restrictions.max_pixels_per_frame().has_value()) {
input_pixels_ = restrictions.max_pixels_per_frame().value();
}
if (restrictions.max_frame_rate().has_value()) {
input_fps_ = restrictions.max_frame_rate().value();
}
provider_->SetInputState(input_pixels_, input_fps_, min_pixels_per_frame_);
}
private:
VideoStreamAdapter* adapter_;
FakeVideoStreamInputStateProvider* provider_;
int input_pixels_;
int input_fps_;
int min_pixels_per_frame_;
};
class FakeVideoStreamAdapterListner : public VideoSourceRestrictionsListener {
public:
void OnVideoSourceRestrictionsUpdated(
VideoSourceRestrictions /* restrictions */,
const VideoAdaptationCounters& /* adaptation_counters */,
scoped_refptr<Resource> /* reason */,
const VideoSourceRestrictions& unfiltered_restrictions) override {
calls_++;
last_restrictions_ = unfiltered_restrictions;
}
int calls() const { return calls_; }
VideoSourceRestrictions last_restrictions() const {
return last_restrictions_;
}
private:
int calls_ = 0;
VideoSourceRestrictions last_restrictions_;
};
class MockAdaptationConstraint : public AdaptationConstraint {
public:
MOCK_METHOD(bool,
IsAdaptationUpAllowed,
(const VideoStreamInputState& input_state,
const VideoSourceRestrictions& restrictions_before,
const VideoSourceRestrictions& restrictions_after),
(const, override));
// MOCK_METHOD(std::string, Name, (), (const, override));
std::string Name() const override { return "MockAdaptationConstraint"; }
};
} // namespace
class VideoStreamAdapterTest : public ::testing::Test {
public:
VideoStreamAdapterTest()
: field_trials_(BalancedFieldTrialConfig()),
resource_(FakeResource::Create("FakeResource")),
adapter_(&input_state_provider_,
&encoder_stats_observer_,
field_trials_) {}
protected:
test::ScopedKeyValueConfig field_trials_;
FakeVideoStreamInputStateProvider input_state_provider_;
scoped_refptr<Resource> resource_;
testing::StrictMock<MockVideoStreamEncoderObserver> encoder_stats_observer_;
VideoStreamAdapter adapter_;
};
TEST_F(VideoStreamAdapterTest, NoRestrictionsByDefault) {
EXPECT_EQ(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adapter_.adaptation_counters().Total());
}
TEST_F(VideoStreamAdapterTest, MaintainFramerate_DecreasesPixelsToThreeFifths) {
const int kInputPixels = 1280 * 720;
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
input_state_provider_.SetInputState(kInputPixels, 30,
kDefaultMinPixelsPerFrame);
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
adapter_.ApplyAdaptation(adaptation, nullptr);
EXPECT_EQ(static_cast<size_t>((kInputPixels * 3) / 5),
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(std::nullopt, adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
}
TEST_F(VideoStreamAdapterTest,
MaintainFramerate_DecreasesPixelsToLimitReached) {
const int kMinPixelsPerFrame = 640 * 480;
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
input_state_provider_.SetInputState(kMinPixelsPerFrame + 1, 30,
kMinPixelsPerFrame);
EXPECT_CALL(encoder_stats_observer_, OnMinPixelLimitReached());
// Even though we are above kMinPixelsPerFrame, because adapting down would
// have exceeded the limit, we are said to have reached the limit already.
// This differs from the frame rate adaptation logic, which would have clamped
// to the limit in the first step and reported kLimitReached in the second
// step.
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kLimitReached, adaptation.status());
}
TEST_F(VideoStreamAdapterTest, MaintainFramerate_IncreasePixelsToFiveThirds) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Go down twice, ensuring going back up is still a restricted resolution.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(2, adapter_.adaptation_counters().resolution_adaptations);
int input_pixels = fake_stream.input_pixels();
// Go up once. The target is 5/3 and the max is 12/5 of the target.
const int target = (input_pixels * 5) / 3;
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(static_cast<size_t>((target * 12) / 5),
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(static_cast<size_t>(target),
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(std::nullopt, adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
}
TEST_F(VideoStreamAdapterTest, MaintainFramerate_IncreasePixelsToUnrestricted) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// We are unrestricted by default and should not be able to adapt up.
EXPECT_EQ(Adaptation::Status::kLimitReached,
adapter_.GetAdaptationUp().status());
// If we go down once and then back up we should not have any restrictions.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adapter_.adaptation_counters().Total());
}
TEST_F(VideoStreamAdapterTest, MaintainResolution_DecreasesFpsToTwoThirds) {
const int kInputFps = 30;
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
input_state_provider_.SetInputState(1280 * 720, kInputFps,
kDefaultMinPixelsPerFrame);
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
adapter_.ApplyAdaptation(adaptation, nullptr);
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(static_cast<double>((kInputFps * 2) / 3),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest, MaintainResolution_DecreasesFpsToLimitReached) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720,
kMinFrameRateFps + 1, kDefaultMinPixelsPerFrame);
// If we are not yet at the limit and the next step would exceed it, the step
// is clamped such that we end up exactly on the limit.
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(static_cast<double>(kMinFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
// Having reached the limit, the next adaptation down is not valid.
EXPECT_EQ(Adaptation::Status::kLimitReached,
adapter_.GetAdaptationDown().status());
}
TEST_F(VideoStreamAdapterTest, MaintainResolution_IncreaseFpsToThreeHalves) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Go down twice, ensuring going back up is still a restricted frame rate.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(2, adapter_.adaptation_counters().fps_adaptations);
int input_fps = fake_stream.input_fps();
// Go up once. The target is 3/2 of the input.
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(static_cast<double>((input_fps * 3) / 2),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest, MaintainResolution_IncreaseFpsToUnrestricted) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// We are unrestricted by default and should not be able to adapt up.
EXPECT_EQ(Adaptation::Status::kLimitReached,
adapter_.GetAdaptationUp().status());
// If we go down once and then back up we should not have any restrictions.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adapter_.adaptation_counters().Total());
}
TEST_F(VideoStreamAdapterTest, Balanced_DecreaseFrameRate) {
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
input_state_provider_.SetInputState(kBalancedMediumResolutionPixels,
kBalancedHighFrameRateFps,
kDefaultMinPixelsPerFrame);
// If our frame rate is higher than the frame rate associated with our
// resolution we should try to adapt to the frame rate associated with our
// resolution: kBalancedMediumFrameRateFps.
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
adapter_.ApplyAdaptation(adaptation, nullptr);
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(static_cast<double>(kBalancedMediumFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(0, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest, Balanced_DecreaseResolution) {
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
FakeVideoStream fake_stream(
&adapter_, &input_state_provider_, kBalancedHighResolutionPixels,
kBalancedHighFrameRateFps, kDefaultMinPixelsPerFrame);
// If we are not below the current resolution's frame rate limit, we should
// adapt resolution according to "maintain-framerate" logic (three fifths).
//
// However, since we are unlimited at the start and input frame rate is not
// below kBalancedHighFrameRateFps, we first restrict the frame rate to
// kBalancedHighFrameRateFps even though that is our current frame rate. This
// does prevent the source from going higher, though, so it's technically not
// a NO-OP.
{
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
}
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(static_cast<double>(kBalancedHighFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(0, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
// Verify "maintain-framerate" logic the second time we adapt: Frame rate
// restrictions remains the same and resolution goes down.
{
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
}
constexpr size_t kReducedPixelsFirstStep =
static_cast<size_t>((kBalancedHighResolutionPixels * 3) / 5);
EXPECT_EQ(kReducedPixelsFirstStep,
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(static_cast<double>(kBalancedHighFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
// If we adapt again, because the balanced settings' proposed frame rate is
// still kBalancedHighFrameRateFps, "maintain-framerate" will trigger again.
static_assert(kReducedPixelsFirstStep > kBalancedMediumResolutionPixels,
"The reduced resolution is still greater than the next lower "
"balanced setting resolution");
constexpr size_t kReducedPixelsSecondStep = (kReducedPixelsFirstStep * 3) / 5;
{
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
}
EXPECT_EQ(kReducedPixelsSecondStep,
adapter_.source_restrictions().max_pixels_per_frame());
EXPECT_EQ(std::nullopt,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(static_cast<double>(kBalancedHighFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(2, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
// Testing when to adapt frame rate and when to adapt resolution is quite
// entangled, so this test covers both cases.
//
// There is an asymmetry: When we adapt down we do it in one order, but when we
// adapt up we don't do it in the reverse order. Instead we always try to adapt
// frame rate first according to balanced settings' configs and only when the
// frame rate is already achieved do we adjust the resolution.
TEST_F(VideoStreamAdapterTest, Balanced_IncreaseFrameRateAndResolution) {
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
FakeVideoStream fake_stream(
&adapter_, &input_state_provider_, kBalancedHighResolutionPixels,
kBalancedHighFrameRateFps, kDefaultMinPixelsPerFrame);
// The desired starting point of this test is having adapted frame rate twice.
// This requires performing a number of adaptations.
constexpr size_t kReducedPixelsFirstStep =
static_cast<size_t>((kBalancedHighResolutionPixels * 3) / 5);
constexpr size_t kReducedPixelsSecondStep = (kReducedPixelsFirstStep * 3) / 5;
constexpr size_t kReducedPixelsThirdStep = (kReducedPixelsSecondStep * 3) / 5;
static_assert(kReducedPixelsFirstStep > kBalancedMediumResolutionPixels,
"The first pixel reduction is greater than the balanced "
"settings' medium pixel configuration");
static_assert(kReducedPixelsSecondStep > kBalancedMediumResolutionPixels,
"The second pixel reduction is greater than the balanced "
"settings' medium pixel configuration");
static_assert(kReducedPixelsThirdStep <= kBalancedMediumResolutionPixels,
"The third pixel reduction is NOT greater than the balanced "
"settings' medium pixel configuration");
// The first adaptation should affect the frame rate: See
// Balanced_DecreaseResolution for explanation why.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(static_cast<double>(kBalancedHighFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
// The next three adaptations affects the resolution, because we have to reach
// kBalancedMediumResolutionPixels before a lower frame rate is considered by
// BalancedDegradationSettings. The number three is derived from the
// static_asserts above.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(kReducedPixelsFirstStep,
adapter_.source_restrictions().max_pixels_per_frame());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(kReducedPixelsSecondStep,
adapter_.source_restrictions().max_pixels_per_frame());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(kReducedPixelsThirdStep,
adapter_.source_restrictions().max_pixels_per_frame());
// Thus, the next adaptation will reduce frame rate to
// kBalancedMediumFrameRateFps.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(static_cast<double>(kBalancedMediumFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(3, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(2, adapter_.adaptation_counters().fps_adaptations);
// Adapt up!
// While our resolution is in the medium-range, the frame rate associated with
// the next resolution configuration up ("high") is kBalancedHighFrameRateFps
// and "balanced" prefers adapting frame rate if not already applied.
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(static_cast<double>(kBalancedHighFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(3, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
// Now that we have already achieved the next frame rate up, we act according
// to "maintain-framerate". We go back up in resolution. Due to rounding
// errors we don't end up back at kReducedPixelsSecondStep. Rather we get to
// kReducedPixelsSecondStepUp, which is off by one compared to
// kReducedPixelsSecondStep.
constexpr size_t kReducedPixelsSecondStepUp =
(kReducedPixelsThirdStep * 5) / 3;
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(kReducedPixelsSecondStepUp,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(2, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
// Now that our resolution is back in the high-range, the next frame rate to
// try out is "unlimited".
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(std::nullopt, adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(2, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(0, adapter_.adaptation_counters().fps_adaptations);
}
// Now only adapting resolution remains.
constexpr size_t kReducedPixelsFirstStepUp =
(kReducedPixelsSecondStepUp * 5) / 3;
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(kReducedPixelsFirstStepUp,
adapter_.source_restrictions().target_pixels_per_frame());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(0, adapter_.adaptation_counters().fps_adaptations);
}
// The last step up should make us entirely unrestricted.
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adapter_.adaptation_counters().Total());
}
}
TEST_F(VideoStreamAdapterTest, Balanced_LimitReached) {
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
FakeVideoStream fake_stream(
&adapter_, &input_state_provider_, kBalancedLowResolutionPixels,
kBalancedLowFrameRateFps, kDefaultMinPixelsPerFrame);
// Attempting to adapt up while unrestricted should result in kLimitReached.
EXPECT_EQ(Adaptation::Status::kLimitReached,
adapter_.GetAdaptationUp().status());
// Adapting down once result in restricted frame rate, in this case we reach
// the lowest possible frame rate immediately: kBalancedLowFrameRateFps.
EXPECT_CALL(encoder_stats_observer_, OnMinPixelLimitReached()).Times(2);
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(static_cast<double>(kBalancedLowFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
// Any further adaptation must follow "maintain-framerate" rules (these are
// covered in more depth by the MaintainFramerate tests). This test does not
// assert exactly how resolution is adjusted, only that resolution always
// decreases and that we eventually reach kLimitReached.
size_t previous_resolution = kBalancedLowResolutionPixels;
bool did_reach_limit = false;
// If we have not reached the limit within 5 adaptations something is wrong...
for (int i = 0; i < 5; i++) {
Adaptation adaptation = adapter_.GetAdaptationDown();
if (adaptation.status() == Adaptation::Status::kLimitReached) {
did_reach_limit = true;
break;
}
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_LT(adapter_.source_restrictions().max_pixels_per_frame().value(),
previous_resolution);
previous_resolution =
adapter_.source_restrictions().max_pixels_per_frame().value();
}
EXPECT_TRUE(did_reach_limit);
// Frame rate restrictions are the same as before.
EXPECT_EQ(static_cast<double>(kBalancedLowFrameRateFps),
adapter_.source_restrictions().max_frame_rate());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
}
// kAwaitingPreviousAdaptation is only supported in "maintain-framerate".
TEST_F(VideoStreamAdapterTest,
MaintainFramerate_AwaitingPreviousAdaptationDown) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down once, but don't update the input.
adapter_.ApplyAdaptation(adapter_.GetAdaptationDown(), nullptr);
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
{
// Having performed the adaptation, but not updated the input based on the
// new restrictions, adapting again in the same direction will not work.
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kAwaitingPreviousAdaptation,
adaptation.status());
}
}
// kAwaitingPreviousAdaptation is only supported in "maintain-framerate".
TEST_F(VideoStreamAdapterTest, MaintainFramerate_AwaitingPreviousAdaptationUp) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Perform two adaptation down so that adapting up twice is possible.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(2, adapter_.adaptation_counters().resolution_adaptations);
// Adapt up once, but don't update the input.
adapter_.ApplyAdaptation(adapter_.GetAdaptationUp(), nullptr);
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
{
// Having performed the adaptation, but not updated the input based on the
// new restrictions, adapting again in the same direction will not work.
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kAwaitingPreviousAdaptation,
adaptation.status());
}
}
TEST_F(VideoStreamAdapterTest,
MaintainResolution_AdaptsUpAfterSwitchingDegradationPreference) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down in fps for later.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
EXPECT_EQ(0, adapter_.adaptation_counters().resolution_adaptations);
// We should be able to adapt in framerate one last time after the change of
// degradation preference.
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(0, adapter_.adaptation_counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest,
MaintainFramerate_AdaptsUpAfterSwitchingDegradationPreference) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down in resolution for later.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
EXPECT_EQ(0, adapter_.adaptation_counters().fps_adaptations);
// We should be able to adapt in framerate one last time after the change of
// degradation preference.
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adapter_.GetAdaptationUp());
EXPECT_EQ(0, adapter_.adaptation_counters().resolution_adaptations);
}
TEST_F(VideoStreamAdapterTest,
PendingResolutionIncreaseAllowsAdaptUpAfterSwitchToMaintainResolution) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt fps down so we can adapt up later in the test.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
// Apply adaptation up but don't update input.
adapter_.ApplyAdaptation(adapter_.GetAdaptationUp(), nullptr);
EXPECT_EQ(Adaptation::Status::kAwaitingPreviousAdaptation,
adapter_.GetAdaptationUp().status());
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
}
TEST_F(VideoStreamAdapterTest,
MaintainFramerate_AdaptsDownAfterSwitchingDegradationPreference) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down once, should change FPS.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
// Adaptation down should apply after the degradation prefs change.
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
}
TEST_F(VideoStreamAdapterTest,
MaintainResolution_AdaptsDownAfterSwitchingDegradationPreference) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down once, should change FPS.
fake_stream.ApplyAdaptation(adapter_.GetAdaptationDown());
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(1, adapter_.adaptation_counters().fps_adaptations);
EXPECT_EQ(1, adapter_.adaptation_counters().resolution_adaptations);
}
TEST_F(
VideoStreamAdapterTest,
PendingResolutionDecreaseAllowsAdaptDownAfterSwitchToMaintainResolution) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Apply adaptation but don't update the input.
adapter_.ApplyAdaptation(adapter_.GetAdaptationDown(), nullptr);
EXPECT_EQ(Adaptation::Status::kAwaitingPreviousAdaptation,
adapter_.GetAdaptationDown().status());
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
}
TEST_F(VideoStreamAdapterTest, RestrictionBroadcasted) {
FakeVideoStreamAdapterListner listener;
adapter_.AddRestrictionsListener(&listener);
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Not broadcast on invalid ApplyAdaptation.
{
Adaptation adaptation = adapter_.GetAdaptationUp();
adapter_.ApplyAdaptation(adaptation, nullptr);
EXPECT_EQ(0, listener.calls());
}
// Broadcast on ApplyAdaptation.
{
Adaptation adaptation = adapter_.GetAdaptationDown();
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(1, listener.calls());
EXPECT_EQ(adaptation.restrictions(), listener.last_restrictions());
}
// Broadcast on ClearRestrictions().
adapter_.ClearRestrictions();
EXPECT_EQ(2, listener.calls());
EXPECT_EQ(VideoSourceRestrictions(), listener.last_restrictions());
}
TEST_F(VideoStreamAdapterTest, AdaptationHasNextRestrcitions) {
// Any non-disabled DegradationPreference will do.
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// When adaptation is not possible.
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kLimitReached, adaptation.status());
EXPECT_EQ(adaptation.restrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adaptation.counters().Total());
}
// When we adapt down.
{
Adaptation adaptation = adapter_.GetAdaptationDown();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(adaptation.restrictions(), adapter_.source_restrictions());
EXPECT_EQ(adaptation.counters(), adapter_.adaptation_counters());
}
// When we adapt up.
{
Adaptation adaptation = adapter_.GetAdaptationUp();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
fake_stream.ApplyAdaptation(adaptation);
EXPECT_EQ(adaptation.restrictions(), adapter_.source_restrictions());
EXPECT_EQ(adaptation.counters(), adapter_.adaptation_counters());
}
}
TEST_F(VideoStreamAdapterTest,
SetDegradationPreferenceToOrFromBalancedClearsRestrictions) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
adapter_.ApplyAdaptation(adapter_.GetAdaptationDown(), nullptr);
EXPECT_NE(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_NE(0, adapter_.adaptation_counters().Total());
// Changing from non-balanced to balanced clears the restrictions.
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
EXPECT_EQ(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adapter_.adaptation_counters().Total());
// Apply adaptation again.
adapter_.ApplyAdaptation(adapter_.GetAdaptationDown(), nullptr);
EXPECT_NE(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_NE(0, adapter_.adaptation_counters().Total());
// Changing from balanced to non-balanced clears the restrictions.
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
EXPECT_EQ(VideoSourceRestrictions(), adapter_.source_restrictions());
EXPECT_EQ(0, adapter_.adaptation_counters().Total());
}
TEST_F(VideoStreamAdapterTest,
GetAdaptDownResolutionAdaptsResolutionInMaintainFramerate) {
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
auto adaptation = adapter_.GetAdaptDownResolution();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
EXPECT_EQ(1, adaptation.counters().resolution_adaptations);
EXPECT_EQ(0, adaptation.counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest,
GetAdaptDownResolutionReturnsWithStatusInDisabledAndMaintainResolution) {
adapter_.SetDegradationPreference(DegradationPreference::DISABLED);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
EXPECT_EQ(Adaptation::Status::kAdaptationDisabled,
adapter_.GetAdaptDownResolution().status());
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
EXPECT_EQ(Adaptation::Status::kLimitReached,
adapter_.GetAdaptDownResolution().status());
}
TEST_F(VideoStreamAdapterTest,
GetAdaptDownResolutionAdaptsFpsAndResolutionInBalanced) {
// Note: This test depends on BALANCED implementation, but with current
// implementation and input state settings, BALANCED will adapt resolution and
// frame rate once.
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
auto adaptation = adapter_.GetAdaptDownResolution();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
EXPECT_EQ(1, adaptation.counters().resolution_adaptations);
EXPECT_EQ(1, adaptation.counters().fps_adaptations);
}
TEST_F(
VideoStreamAdapterTest,
GetAdaptDownResolutionAdaptsOnlyResolutionIfFpsAlreadyAdapterInBalanced) {
// Note: This test depends on BALANCED implementation, but with current
// implementation and input state settings, BALANCED will adapt resolution
// only.
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
input_state_provider_.SetInputState(1280 * 720, 5, kDefaultMinPixelsPerFrame);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
auto first_adaptation = adapter_.GetAdaptationDown();
fake_stream.ApplyAdaptation(first_adaptation);
auto adaptation = adapter_.GetAdaptDownResolution();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
EXPECT_EQ(1, adaptation.counters().resolution_adaptations);
EXPECT_EQ(first_adaptation.counters().fps_adaptations,
adaptation.counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest,
GetAdaptDownResolutionAdaptsOnlyFpsIfResolutionLowInBalanced) {
// Note: This test depends on BALANCED implementation, but with current
// implementation and input state settings, BALANCED will adapt resolution
// only.
adapter_.SetDegradationPreference(DegradationPreference::BALANCED);
input_state_provider_.SetInputState(kDefaultMinPixelsPerFrame, 30,
kDefaultMinPixelsPerFrame);
auto adaptation = adapter_.GetAdaptDownResolution();
EXPECT_EQ(Adaptation::Status::kValid, adaptation.status());
EXPECT_EQ(0, adaptation.counters().resolution_adaptations);
EXPECT_EQ(1, adaptation.counters().fps_adaptations);
}
TEST_F(VideoStreamAdapterTest,
AdaptationDisabledStatusAlwaysWhenDegradationPreferenceDisabled) {
adapter_.SetDegradationPreference(DegradationPreference::DISABLED);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
EXPECT_EQ(Adaptation::Status::kAdaptationDisabled,
adapter_.GetAdaptationDown().status());
EXPECT_EQ(Adaptation::Status::kAdaptationDisabled,
adapter_.GetAdaptationUp().status());
EXPECT_EQ(Adaptation::Status::kAdaptationDisabled,
adapter_.GetAdaptDownResolution().status());
}
TEST_F(VideoStreamAdapterTest, AdaptationConstraintAllowsAdaptationsUp) {
testing::StrictMock<MockAdaptationConstraint> adaptation_constraint;
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
adapter_.AddAdaptationConstraint(&adaptation_constraint);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down once so we can adapt up later.
auto first_adaptation = adapter_.GetAdaptationDown();
fake_stream.ApplyAdaptation(first_adaptation);
EXPECT_CALL(adaptation_constraint,
IsAdaptationUpAllowed(_, first_adaptation.restrictions(), _))
.WillOnce(Return(true));
EXPECT_EQ(Adaptation::Status::kValid, adapter_.GetAdaptationUp().status());
adapter_.RemoveAdaptationConstraint(&adaptation_constraint);
}
TEST_F(VideoStreamAdapterTest, AdaptationConstraintDisallowsAdaptationsUp) {
testing::StrictMock<MockAdaptationConstraint> adaptation_constraint;
adapter_.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
adapter_.AddAdaptationConstraint(&adaptation_constraint);
input_state_provider_.SetInputState(1280 * 720, 30,
kDefaultMinPixelsPerFrame);
FakeVideoStream fake_stream(&adapter_, &input_state_provider_, 1280 * 720, 30,
kDefaultMinPixelsPerFrame);
// Adapt down once so we can adapt up later.
auto first_adaptation = adapter_.GetAdaptationDown();
fake_stream.ApplyAdaptation(first_adaptation);
EXPECT_CALL(adaptation_constraint,
IsAdaptationUpAllowed(_, first_adaptation.restrictions(), _))
.WillOnce(Return(false));
EXPECT_EQ(Adaptation::Status::kRejectedByConstraint,
adapter_.GetAdaptationUp().status());
adapter_.RemoveAdaptationConstraint(&adaptation_constraint);
}
// Death tests.
// Disabled on Android because death tests misbehave on Android, see
// base/test/gtest_util.h.
#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
TEST(VideoStreamAdapterDeathTest,
SetDegradationPreferenceInvalidatesAdaptations) {
test::ScopedKeyValueConfig field_trials;
FakeVideoStreamInputStateProvider input_state_provider;
testing::StrictMock<MockVideoStreamEncoderObserver> encoder_stats_observer_;
VideoStreamAdapter adapter(&input_state_provider, &encoder_stats_observer_,
field_trials);
adapter.SetDegradationPreference(DegradationPreference::MAINTAIN_FRAMERATE);
input_state_provider.SetInputState(1280 * 720, 30, kDefaultMinPixelsPerFrame);
Adaptation adaptation = adapter.GetAdaptationDown();
adapter.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
EXPECT_DEATH(adapter.ApplyAdaptation(adaptation, nullptr), "");
}
TEST(VideoStreamAdapterDeathTest, AdaptDownInvalidatesAdaptations) {
test::ScopedKeyValueConfig field_trials;
FakeVideoStreamInputStateProvider input_state_provider;
testing::StrictMock<MockVideoStreamEncoderObserver> encoder_stats_observer_;
VideoStreamAdapter adapter(&input_state_provider, &encoder_stats_observer_,
field_trials);
adapter.SetDegradationPreference(DegradationPreference::MAINTAIN_RESOLUTION);
input_state_provider.SetInputState(1280 * 720, 30, kDefaultMinPixelsPerFrame);
Adaptation adaptation = adapter.GetAdaptationDown();
adapter.GetAdaptationDown();
EXPECT_DEATH(adapter.ApplyAdaptation(adaptation, nullptr), "");
}
#endif // RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
} // namespace webrtc
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