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/*
* Copyright 2024 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.
*/
// This file contains tests that verify that congestion control options
// are correctly negotiated in the SDP offer/answer.
#include <string>
#include "absl/strings/str_cat.h"
#include "api/peer_connection_interface.h"
#include "api/test/rtc_error_matchers.h"
#include "pc/test/integration_test_helpers.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/wait_until.h"
namespace webrtc {
using testing::Eq;
using ::testing::Gt;
using testing::HasSubstr;
using ::testing::IsTrue;
using testing::Not;
class PeerConnectionCongestionControlTest
: public PeerConnectionIntegrationBaseTest {
public:
PeerConnectionCongestionControlTest()
: PeerConnectionIntegrationBaseTest(SdpSemantics::kUnifiedPlan) {}
};
TEST_F(PeerConnectionCongestionControlTest, OfferContainsCcfbIfEnabled) {
SetFieldTrials("WebRTC-RFC8888CongestionControlFeedback/Enabled/");
ASSERT_TRUE(CreatePeerConnectionWrappers());
caller()->AddAudioVideoTracks();
auto offer = caller()->CreateOfferAndWait();
std::string offer_str = absl::StrCat(*offer);
EXPECT_THAT(offer_str, HasSubstr("a=rtcp-fb:* ack ccfb\r\n"));
}
TEST_F(PeerConnectionCongestionControlTest, ReceiveOfferSetsCcfbFlag) {
SetFieldTrials("WebRTC-RFC8888CongestionControlFeedback/Enabled/");
ASSERT_TRUE(CreatePeerConnectionWrappers());
ConnectFakeSignalingForSdpOnly();
caller()->AddAudioVideoTracks();
caller()->CreateAndSetAndSignalOffer();
ASSERT_THAT(WaitUntil([&] { return SignalingStateStable(); }, IsTrue()),
IsRtcOk());
{
// Check that the callee parsed it.
auto parsed_contents =
callee()->pc()->remote_description()->description()->contents();
EXPECT_FALSE(parsed_contents.empty());
for (const auto& content : parsed_contents) {
EXPECT_TRUE(content.media_description()->rtcp_fb_ack_ccfb());
}
}
{
// Check that the caller also parsed it.
auto parsed_contents =
caller()->pc()->remote_description()->description()->contents();
EXPECT_FALSE(parsed_contents.empty());
for (const auto& content : parsed_contents) {
EXPECT_TRUE(content.media_description()->rtcp_fb_ack_ccfb());
}
}
// Check that the answer does not contain transport-cc
std::string answer_str = absl::StrCat(*caller()->pc()->remote_description());
EXPECT_THAT(answer_str, Not(HasSubstr("transport-cc")));
}
TEST_F(PeerConnectionCongestionControlTest, CcfbGetsUsed) {
SetFieldTrials("WebRTC-RFC8888CongestionControlFeedback/Enabled/");
ASSERT_TRUE(CreatePeerConnectionWrappers());
ConnectFakeSignaling();
caller()->AddAudioVideoTracks();
caller()->CreateAndSetAndSignalOffer();
ASSERT_THAT(WaitUntil([&] { return SignalingStateStable(); }, IsTrue()),
IsRtcOk());
MediaExpectations media_expectations;
media_expectations.CalleeExpectsSomeAudio();
media_expectations.CalleeExpectsSomeVideo();
ASSERT_TRUE(ExpectNewFrames(media_expectations));
auto pc_internal = caller()->pc_internal();
EXPECT_THAT(
WaitUntil(
[&] {
return pc_internal->FeedbackAccordingToRfc8888CountForTesting();
},
Gt(0)),
IsRtcOk());
// There should be no transport-cc generated.
EXPECT_THAT(pc_internal->FeedbackAccordingToTransportCcCountForTesting(),
Eq(0));
}
TEST_F(PeerConnectionCongestionControlTest, TransportCcGetsUsed) {
SetFieldTrials("WebRTC-RFC8888CongestionControlFeedback/Disabled/");
ASSERT_TRUE(CreatePeerConnectionWrappers());
ConnectFakeSignaling();
caller()->AddAudioVideoTracks();
caller()->CreateAndSetAndSignalOffer();
ASSERT_THAT(WaitUntil([&] { return SignalingStateStable(); }, IsTrue()),
IsRtcOk());
MediaExpectations media_expectations;
media_expectations.CalleeExpectsSomeAudio();
media_expectations.CalleeExpectsSomeVideo();
ASSERT_TRUE(ExpectNewFrames(media_expectations));
auto pc_internal = caller()->pc_internal();
EXPECT_THAT(
WaitUntil(
[&] {
return pc_internal->FeedbackAccordingToTransportCcCountForTesting();
},
Gt(0)),
IsRtcOk());
// Test that RFC 8888 feedback is NOT generated when field trial disabled.
EXPECT_THAT(pc_internal->FeedbackAccordingToRfc8888CountForTesting(), Eq(0));
}
} // namespace webrtc
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