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/*
* Copyright 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 <stdint.h>
#include <memory>
#include <optional>
#include "api/adaptation/resource.h"
#include "api/audio_codecs/builtin_audio_decoder_factory.h"
#include "api/audio_codecs/builtin_audio_encoder_factory.h"
#include "api/make_ref_counted.h"
#include "api/media_stream_interface.h"
#include "api/peer_connection_interface.h"
#include "api/rtc_error.h"
#include "api/rtp_parameters.h"
#include "api/rtp_sender_interface.h"
#include "api/scoped_refptr.h"
#include "api/test/rtc_error_matchers.h"
#include "api/video/video_source_interface.h"
#include "call/adaptation/test/fake_resource.h"
#include "pc/test/fake_periodic_video_source.h"
#include "pc/test/fake_periodic_video_track_source.h"
#include "pc/test/peer_connection_test_wrapper.h"
#include "rtc_base/checks.h"
#include "rtc_base/thread.h"
#include "rtc_base/time_utils.h"
#include "rtc_base/virtual_socket_server.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/wait_until.h"
namespace webrtc {
struct TrackWithPeriodicSource {
scoped_refptr<VideoTrackInterface> track;
scoped_refptr<FakePeriodicVideoTrackSource> periodic_track_source;
};
// Performs an O/A exchange and waits until the signaling state is stable again.
void Negotiate(scoped_refptr<PeerConnectionTestWrapper> caller,
scoped_refptr<PeerConnectionTestWrapper> callee) {
// Wire up callbacks and listeners such that a full O/A is performed in
// response to CreateOffer().
PeerConnectionTestWrapper::Connect(caller.get(), callee.get());
caller->CreateOffer(PeerConnectionInterface::RTCOfferAnswerOptions());
caller->WaitForNegotiation();
}
TrackWithPeriodicSource CreateTrackWithPeriodicSource(
scoped_refptr<PeerConnectionFactoryInterface> factory) {
FakePeriodicVideoSource::Config periodic_track_source_config;
periodic_track_source_config.frame_interval_ms = 100;
periodic_track_source_config.timestamp_offset_ms = TimeMillis();
scoped_refptr<FakePeriodicVideoTrackSource> periodic_track_source =
make_ref_counted<FakePeriodicVideoTrackSource>(
periodic_track_source_config, /* remote */ false);
TrackWithPeriodicSource track_with_source;
track_with_source.track =
factory->CreateVideoTrack(periodic_track_source, "PeriodicTrack");
track_with_source.periodic_track_source = periodic_track_source;
return track_with_source;
}
// Triggers overuse and obtains VideoSinkWants. Adaptation processing happens in
// parallel and this function makes no guarantee that the returnd VideoSinkWants
// have yet to reflect the overuse signal. Used together with EXPECT_TRUE_WAIT
// to "spam overuse until a change is observed".
VideoSinkWants TriggerOveruseAndGetSinkWants(
scoped_refptr<FakeResource> fake_resource,
const FakePeriodicVideoSource& source) {
fake_resource->SetUsageState(ResourceUsageState::kOveruse);
return source.wants();
}
class PeerConnectionAdaptationIntegrationTest : public ::testing::Test {
public:
PeerConnectionAdaptationIntegrationTest()
: virtual_socket_server_(),
network_thread_(new Thread(&virtual_socket_server_)),
worker_thread_(Thread::Create()) {
RTC_CHECK(network_thread_->Start());
RTC_CHECK(worker_thread_->Start());
}
scoped_refptr<PeerConnectionTestWrapper> CreatePcWrapper(const char* name) {
scoped_refptr<PeerConnectionTestWrapper> pc_wrapper =
make_ref_counted<PeerConnectionTestWrapper>(
name, &virtual_socket_server_, network_thread_.get(),
worker_thread_.get());
PeerConnectionInterface::RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
EXPECT_TRUE(pc_wrapper->CreatePc(config, CreateBuiltinAudioEncoderFactory(),
CreateBuiltinAudioDecoderFactory()));
return pc_wrapper;
}
protected:
VirtualSocketServer virtual_socket_server_;
std::unique_ptr<Thread> network_thread_;
std::unique_ptr<Thread> worker_thread_;
};
TEST_F(PeerConnectionAdaptationIntegrationTest,
ResouceInjectedAfterNegotiationCausesReductionInResolution) {
auto caller_wrapper = CreatePcWrapper("caller");
auto caller = caller_wrapper->pc();
auto callee_wrapper = CreatePcWrapper("callee");
// Adding a track and negotiating ensures that a VideoSendStream exists.
TrackWithPeriodicSource track_with_source =
CreateTrackWithPeriodicSource(caller_wrapper->pc_factory());
auto sender = caller->AddTrack(track_with_source.track, {}).value();
Negotiate(caller_wrapper, callee_wrapper);
// Prefer degrading resolution.
auto parameters = sender->GetParameters();
parameters.degradation_preference = DegradationPreference::MAINTAIN_FRAMERATE;
sender->SetParameters(parameters);
const auto& source =
track_with_source.periodic_track_source->fake_periodic_source();
int pixel_count_before_overuse = source.wants().max_pixel_count;
// Inject a fake resource and spam kOveruse until resolution becomes limited.
auto fake_resource = FakeResource::Create("FakeResource");
caller->AddAdaptationResource(fake_resource);
EXPECT_THAT(WaitUntil(
[&] {
return TriggerOveruseAndGetSinkWants(fake_resource, source)
.max_pixel_count;
},
::testing::Lt(pixel_count_before_overuse)),
IsRtcOk());
}
TEST_F(PeerConnectionAdaptationIntegrationTest,
ResouceInjectedBeforeNegotiationCausesReductionInResolution) {
auto caller_wrapper = CreatePcWrapper("caller");
auto caller = caller_wrapper->pc();
auto callee_wrapper = CreatePcWrapper("callee");
// Inject a fake resource before adding any tracks or negotiating.
auto fake_resource = FakeResource::Create("FakeResource");
caller->AddAdaptationResource(fake_resource);
// Adding a track and negotiating ensures that a VideoSendStream exists.
TrackWithPeriodicSource track_with_source =
CreateTrackWithPeriodicSource(caller_wrapper->pc_factory());
auto sender = caller->AddTrack(track_with_source.track, {}).value();
Negotiate(caller_wrapper, callee_wrapper);
// Prefer degrading resolution.
auto parameters = sender->GetParameters();
parameters.degradation_preference = DegradationPreference::MAINTAIN_FRAMERATE;
sender->SetParameters(parameters);
const auto& source =
track_with_source.periodic_track_source->fake_periodic_source();
int pixel_count_before_overuse = source.wants().max_pixel_count;
// Spam kOveruse until resolution becomes limited.
EXPECT_THAT(WaitUntil(
[&] {
return TriggerOveruseAndGetSinkWants(fake_resource, source)
.max_pixel_count;
},
::testing::Lt(pixel_count_before_overuse)),
IsRtcOk());
}
} // namespace webrtc
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