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Quelle sdp_offer_answer_unittest.ccSprache: C |
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/* * Copyright 2017 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 <algorithm> #include <cstddef> #include <cstdint> #include <memory> #include <optional> #include <string> #include <tuple> #include <utility> #include <vector> #include "absl/strings/match.h" #include "absl/strings/str_cat.h" #include "absl/strings/str_replace.h" #include "absl/strings/string_view.h" #include "api/audio_codecs/builtin_audio_decoder_factory.h" #include "api/audio_codecs/builtin_audio_encoder_factory.h" #include "api/create_peerconnection_factory.h" #include "api/jsep.h" #include "api/media_types.h" #include "api/peer_connection_interface.h" #include "api/rtc_error.h" #include "api/rtp_parameters.h" #include "api/rtp_transceiver_direction.h" #include "api/rtp_transceiver_interface.h" #include "api/scoped_refptr.h" #include "api/video_codecs/sdp_video_format.h" #include "api/video_codecs/video_decoder_factory_template.h" #include "api/video_codecs/video_decoder_factory_template_dav1d_adapter.h" #include "api/video_codecs/video_decoder_factory_template_libvpx_vp8_adapter.h" #include "api/video_codecs/video_decoder_factory_template_libvpx_vp9_adapter.h" #include "api/video_codecs/video_decoder_factory_template_open_h264_adapter.h" #include "api/video_codecs/video_encoder_factory_template.h" #include "api/video_codecs/video_encoder_factory_template_libaom_av1_adapter.h" #include "api/video_codecs/video_encoder_factory_template_libvpx_vp8_adapter.h" #include "api/video_codecs/video_encoder_factory_template_libvpx_vp9_adapter.h" #include "api/video_codecs/video_encoder_factory_template_open_h264_adapter.h" #include "media/base/codec.h" #include "media/base/media_constants.h" #include "media/base/stream_params.h" #include "pc/peer_connection_wrapper.h" #include "pc/rtp_transceiver.h" #include "pc/session_description.h" #include "pc/test/fake_audio_capture_module.h" #include "pc/test/integration_test_helpers.h" #include "pc/test/mock_peer_connection_observers.h" #include "rtc_base/thread.h" #include "system_wrappers/include/metrics.h" #include "test/create_test_field_trials.h" #include "test/gmock.h" #include "test/gtest.h" #include "test/run_loop.h" // This file contains unit tests that relate to the behavior of the // SdpOfferAnswer module. // Tests are written as integration tests with PeerConnection, since the // behaviors are still linked so closely that it is hard to test them in // isolation. namespace webrtc { using ::testing::ElementsAre; using ::testing::Eq; using ::testing::IsTrue; using ::testing::NotNull; using ::testing::Optional; using ::testing::Pair; using ::testing::SizeIs; using RTCConfiguration = PeerConnectionInterface::RTCConfiguration; namespace { std::unique_ptr<Thread> CreateAndStartThread() { auto thread = Thread::Create(); thread->Start(); return thread; } // Helper to enable SFrame directly on a transceiver's internal state. // Must be called with the signaling thread to ensure thread safety. void EnableSframeOnTransceiver( Thread* signaling_thread, const scoped_refptr<RtpTransceiverInterface>& transceiver) { signaling_thread->BlockingCall([&]() { static_cast<RtpTransceiverProxyWithInternal<RtpTransceiver>*>( transceiver.get()) ->internal() ->TryToEnableSframe(); }); } } // namespace class SdpOfferAnswerTest : public ::testing::Test { public: SdpOfferAnswerTest() // Note: We use a PeerConnectionFactory with a distinct // signaling thread, so that thread handling can be tested. : signaling_thread_(CreateAndStartThread()), pc_factory_(CreatePeerConnectionFactory( nullptr, nullptr, signaling_thread_.get(), FakeAudioCaptureModule::Create(), CreateBuiltinAudioEncoderFactory(), CreateBuiltinAudioDecoderFactory(), std::make_unique< VideoEncoderFactoryTemplate<LibvpxVp8EncoderTemplateAdapter, LibvpxVp9EncoderTemplateAdapter, OpenH264EncoderTemplateAdapter, LibaomAv1EncoderTemplateAdapter>>(), std::make_unique< VideoDecoderFactoryTemplate<LibvpxVp8DecoderTemplateAdapter, LibvpxVp9DecoderTemplateAdapter, OpenH264DecoderTemplateAdapter, Dav1dDecoderTemplateAdapter>>(), nullptr /* audio_mixer */, nullptr /* audio_processing */, nullptr /* audio_frame_processor */)) { metrics::Reset(); } std::unique_ptr<PeerConnectionWrapper> CreatePeerConnection( absl::string_view field_trials = "") { RTCConfiguration config; config.sdp_semantics = SdpSemantics::kUnifiedPlan; return CreatePeerConnection(config, field_trials); } std::unique_ptr<PeerConnectionWrapper> CreatePeerConnection( const RTCConfiguration& config, absl::string_view field_trials) { auto observer = std::make_unique<MockPeerConnectionObserver>(); PeerConnectionDependencies pc_deps(observer.get()); pc_deps.trials = CreateTestFieldTrialsPtr(field_trials); auto result = pc_factory_->CreatePeerConnectionOrError(config, std::move(pc_deps)); EXPECT_TRUE(result.ok()); observer->SetPeerConnectionInterface(result.value().get()); return std::make_unique<PeerConnectionWrapper>( pc_factory_, result.MoveValue(), std::move(observer)); } std::optional<RtpCodecCapability> FindFirstSendCodecWithName( MediaType media_type, const std::string& name) const { std::vector<RtpCodecCapability> codecs = pc_factory_->GetRtpSenderCapabilities(media_type).codecs; for (const auto& codec : codecs) { if (absl::EqualsIgnoreCase(codec.name, name)) { return codec; } } return std::nullopt; } protected: std::unique_ptr<Thread> signaling_thread_; scoped_refptr<PeerConnectionFactoryInterface> pc_factory_; private: test::RunLoop main_thread_; }; TEST_F(SdpOfferAnswerTest, OnTrackReturnsProxiedObject) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto audio_transceiver = caller->AddTransceiver(MediaType::AUDIO); ASSERT_TRUE(caller->ExchangeOfferAnswerWith(callee.get())); // Verify that caller->observer->OnTrack() has been called with a // proxied transceiver object. ASSERT_EQ(callee->observer()->on_track_transceivers_.size(), 1u); auto transceiver = callee->observer()->on_track_transceivers_[0]; // Since the signaling thread is not the current thread, // this will DCHECK if the transceiver is not proxied. transceiver->stopped(); } TEST_F(SdpOfferAnswerTest, BundleAcceptsCodecCollisionsAudioVideoWhenFieldTrialDisabled) { auto pc = CreatePeerConnection(""); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 opus/48000/2\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=" "42e01f\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); EXPECT_METRIC_EQ( 1, metrics::NumEvents("WebRTC.PeerConnection.ValidBundledPayloadTypes", false)); // Tolerate codec collisions in rejected m-lines. pc = CreatePeerConnection(); auto rejected_offer = CreateSessionDescription( SdpType::kOffer, absl::StrReplaceAll(sdp, {{"m=video 9 ", "m=video 0 "}})); pc->SetRemoteDescription(std::move(rejected_offer), &error); EXPECT_TRUE(error.ok()); EXPECT_METRIC_EQ( 1, metrics::NumEvents("WebRTC.PeerConnection.ValidBundledPayloadTypes", true)); } TEST_F(SdpOfferAnswerTest, BundleRejectsCodecCollisionsAudioVideoWhenFieldTrialEnabled) { auto pc = CreatePeerConnection( "WebRTC-SdpBundlePayloadTypeCollisionCheck/Enabled/"); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 opus/48000/2\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=" "42e01f\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_FALSE(error.ok()); EXPECT_THAT(error.type(), Eq(RTCErrorType::INVALID_PARAMETER)); EXPECT_METRIC_EQ( 1, metrics::NumEvents("WebRTC.PeerConnection.ValidBundledPayloadTypes", false)); } TEST_F(SdpOfferAnswerTest, BundleAcceptsCodecCollisionsVideoFmtpWhenFieldTrialDisabled) { auto pc = CreatePeerConnection(""); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=" "42e01f\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); EXPECT_METRIC_EQ( 1, metrics::NumEvents("WebRTC.PeerConnection.ValidBundledPayloadTypes", false)); } TEST_F(SdpOfferAnswerTest, BundleRejectsCodecCollisionsVideoFmtpWhenFieldTrialEnabled) { auto pc = CreatePeerConnection( "WebRTC-SdpBundlePayloadTypeCollisionCheck/Enabled/"); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=" "42e01f\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_FALSE(error.ok()); EXPECT_THAT(error.type(), Eq(RTCErrorType::INVALID_PARAMETER)); EXPECT_METRIC_EQ( 1, metrics::NumEvents("WebRTC.PeerConnection.ValidBundledPayloadTypes", false)); } TEST_F(SdpOfferAnswerTest, BundleCodecCollisionInDifferentBundlesAllowed) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=group:BUNDLE 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=" "42e01f\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:111 H264/90000\r\n" "a=fmtp:111 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); EXPECT_METRIC_EQ( 0, metrics::NumEvents("WebRTC.PeerConnection.ValidBundledPayloadTypes", false)); } TEST_F(SdpOfferAnswerTest, BundleMeasuresHeaderExtensionIdCollision) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=extmap:3 " "http://www.ietf.org/id/" "draft-holmer-rmcat-transport-wide-cc-extensions-01\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 112\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:112 VP8/90000\r\n" "a=extmap:3 " "http://www.ietf.org/id/" "draft-holmer-rmcat-transport-wide-cc-extensions-01\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); } // extmap:3 is used with two different URIs which is not allowed. TEST_F(SdpOfferAnswerTest, BundleRejectsHeaderExtensionIdCollision) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=extmap:3 " "http://www.ietf.org/id/" "draft-holmer-rmcat-transport-wide-cc-extensions-01\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 112\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:112 VP8/90000\r\n" "a=extmap:3 urn:3gpp:video-orientation\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } // transport-wide cc is negotiated with two different ids 3 and 4. // This is not a good idea but tolerable. TEST_F(SdpOfferAnswerTest, BundleAcceptsDifferentIdsForSameExtension) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=extmap:3 " "http://www.ietf.org/id/" "draft-holmer-rmcat-transport-wide-cc-extensions-01\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 112\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:1\r\n" "a=rtpmap:112 VP8/90000\r\n" "a=extmap:4 " "http://www.ietf.org/id/" "draft-holmer-rmcat-transport-wide-cc-extensions-01\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); } TEST_F(SdpOfferAnswerTest, LargeMidsAreRejected) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=rtpmap:111 VP8/90000\r\n" "a=mid:01234567890123456\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, RollbackPreservesAddTrackMid) { std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 **-----**\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-lite\r\n" "a=msid-semantic: WMS 100030878598094:4Qs1PjbLM32RK5u3\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level\r\n" "a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid\r\n" "a=group:BUNDLE 0 1\r\n" "m=audio 40005 UDP/TLS/RTP/SAVPF 111\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=fmtp:111 " "maxaveragebitrate=20000;maxplaybackrate=16000;minptime=10;usedtx=1;" "useinbandfec=1;stereo=0\r\n" "a=rtcp-fb:111 nack\r\n" "a=setup:passive\r\n" "a=mid:0\r\n" "a=msid:- 75156ebd-e705-4da1-920e-2dac39794dfd\r\n" "a=ptime:60\r\n" "a=recvonly\r\n" "a=rtcp-mux\r\n" "m=audio 40005 UDP/TLS/RTP/SAVPF 111\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=fmtp:111 " "maxaveragebitrate=20000;maxplaybackrate=16000;minptime=10;usedtx=1;" "useinbandfec=1;stereo=0\r\n" "a=rtcp-fb:111 nack\r\n" "a=setup:passive\r\n" "a=mid:1\r\n" "a=msid:100030878598094:4Qs1PjbLM32RK5u3 9695447562408476674\r\n" "a=ptime:60\r\n" "a=sendonly\r\n" "a=ssrc:2565730539 cname:100030878598094:4Qs1PjbLM32RK5u3\r\n" "a=rtcp-mux\r\n"; auto pc = CreatePeerConnection(); auto audio_track = pc->AddAudioTrack("audio_track", {}); auto first_transceiver = pc->pc()->GetTransceivers()[0]; EXPECT_FALSE(first_transceiver->mid().has_value()); auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; ASSERT_TRUE(pc->SetRemoteDescription(std::move(desc))); pc->CreateAnswerAndSetAsLocal(); auto saved_mid = first_transceiver->mid(); EXPECT_TRUE(saved_mid.has_value()); auto offer_before_rollback = pc->CreateOfferAndSetAsLocal(); EXPECT_EQ(saved_mid, first_transceiver->mid()); auto rollback = pc->CreateRollback(); ASSERT_NE(rollback, nullptr); ASSERT_TRUE(pc->SetLocalDescription(std::move(rollback))); EXPECT_EQ(saved_mid, first_transceiver->mid()); auto offer2 = pc->CreateOfferAndSetAsLocal(); ASSERT_NE(offer2, nullptr); EXPECT_EQ(saved_mid, first_transceiver->mid()); } #ifdef WEBRTC_HAVE_SCTP TEST_F(SdpOfferAnswerTest, RejectedDataChannelsDoNotGetReoffered) { auto pc = CreatePeerConnection(); EXPECT_TRUE(pc->pc()->CreateDataChannelOrError("dc", nullptr).ok()); EXPECT_TRUE(pc->CreateOfferAndSetAsLocal()); auto mid = pc->pc()->local_description()->description()->contents()[0].mid(); // An answer that rejects the datachannel content. std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 **-----**\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=application 0 UDP/DTLS/SCTP webrtc-datachannel\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sctp-port:5000\r\n" "a=max-message-size:262144\r\n" "a=mid:" + mid + "\r\n"; std::unique_ptr<SessionDescriptionInterface> answer = CreateSessionDescription(SdpType::kAnswer, sdp); ASSERT_TRUE(pc->SetRemoteDescription(std::move(answer))); // The subsequent offer should not recycle the m-line since the existing data // channel is closed. std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); const auto& offer_contents = offer->description()->contents(); ASSERT_EQ(offer_contents.size(), 1u); EXPECT_EQ(offer_contents[0].mid(), mid); EXPECT_EQ(offer_contents[0].rejected, true); } TEST_F(SdpOfferAnswerTest, RejectedDataChannelsDoGetReofferedWhenActive) { auto pc = CreatePeerConnection(); EXPECT_TRUE(pc->pc()->CreateDataChannelOrError("dc", nullptr).ok()); EXPECT_TRUE(pc->CreateOfferAndSetAsLocal()); auto mid = pc->pc()->local_description()->description()->contents()[0].mid(); // An answer that rejects the datachannel content. std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 **-----**\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=application 0 UDP/DTLS/SCTP webrtc-datachannel\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sctp-port:5000\r\n" "a=max-message-size:262144\r\n" "a=mid:" + mid + "\r\n"; std::unique_ptr<SessionDescriptionInterface> answer = CreateSessionDescription(SdpType::kAnswer, sdp); ASSERT_TRUE(pc->SetRemoteDescription(std::move(answer))); // The subsequent offer should recycle the m-line when there is a new data // channel. EXPECT_TRUE(pc->pc()->CreateDataChannelOrError("dc2", nullptr).ok()); EXPECT_TRUE(pc->pc()->ShouldFireNegotiationNeededEvent( pc->observer()->latest_negotiation_needed_event())); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); const auto& offer_contents = offer->description()->contents(); ASSERT_EQ(offer_contents.size(), 1u); EXPECT_EQ(offer_contents[0].mid(), mid); EXPECT_EQ(offer_contents[0].rejected, false); } TEST_F(SdpOfferAnswerTest, AlwaysNegotiateDataChannels) { RTCConfiguration config; config.always_negotiate_data_channels = true; auto caller = CreatePeerConnection(config, /*field_trials=*/""); // No data channels are created. auto video_transceiver = caller->AddTransceiver(MediaType::VIDEO); auto offer = caller->CreateOffer(); ASSERT_THAT(offer, NotNull()); auto& contents = offer->description()->contents(); ASSERT_THAT(contents, SizeIs(2)); // SCTP is negotiated first. EXPECT_EQ(MediaProtocolType::kSctp, contents[0].type); EXPECT_EQ(MediaProtocolType::kRtp, contents[1].type); } TEST_F(SdpOfferAnswerTest, AlwaysNegotiateDataChannelsNegotiationNeeded) { RTCConfiguration config; config.always_negotiate_data_channels = true; auto caller = CreatePeerConnection(config, /*field_trials=*/""); auto callee = CreatePeerConnection(); // ONN should not fire. EXPECT_FALSE(caller->observer()->has_negotiation_needed_event()); // No data channels are created. auto video_transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE(caller->pc()->ShouldFireNegotiationNeededEvent( caller->observer()->latest_negotiation_needed_event())); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); auto& contents = offer->description()->contents(); ASSERT_THAT(contents, SizeIs(2)); // SCTP is negotiated first. EXPECT_EQ(MediaProtocolType::kSctp, contents[0].type); EXPECT_EQ(MediaProtocolType::kRtp, contents[1].type); // Negotiate to clear ONN. ASSERT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer, NotNull()); ASSERT_TRUE(caller->SetRemoteDescription(std::move(answer))); // Create a datachannel. EXPECT_TRUE(caller->pc()->CreateDataChannelOrError("first_dc", nullptr).ok()); EXPECT_FALSE(caller->pc()->ShouldFireNegotiationNeededEvent( caller->observer()->latest_negotiation_needed_event())); } TEST_F(SdpOfferAnswerTest, AlwaysNegotiateDataChannelsSetConfiguration) { RTCConfiguration config; config.always_negotiate_data_channels = false; auto caller = CreatePeerConnection(config, /*field_trials=*/""); RTCConfiguration pc_config = caller->pc()->GetConfiguration(); pc_config.always_negotiate_data_channels = true; EXPECT_TRUE(caller->pc()->SetConfiguration(pc_config).ok()); // No data channels are created. auto offer = caller->CreateOffer(); ASSERT_THAT(offer, NotNull()); auto& contents = offer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); // SCTP is negotiated. EXPECT_EQ(MediaProtocolType::kSctp, contents[0].type); } #endif // WEBRTC_HAVE_SCTP TEST_F(SdpOfferAnswerTest, SimulcastAnswerWithNoRidsIsRejected) { auto pc = CreatePeerConnection(); RtpTransceiverInit init; RtpEncodingParameters rid1; rid1.rid = "1"; init.send_encodings.push_back(rid1); RtpEncodingParameters rid2; rid2.rid = "2"; init.send_encodings.push_back(rid2); auto transceiver = pc->AddTransceiver(MediaType::VIDEO, init); EXPECT_TRUE(pc->CreateOfferAndSetAsLocal()); auto mid = pc->pc()->local_description()->description()->contents()[0].mid(); // A SDP answer with simulcast but without mid/rid extensions. std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 **-----**\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp:9 IN IP4 0.0.0.0\r\n" "a=mid:" + mid + "\r\n" "a=recvonly\r\n" "a=rtcp-mux\r\n" "a=rtcp-rsize\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rid:1 recv\r\n" "a=rid:2 recv\r\n" "a=simulcast:recv 1;2\r\n"; std::string extensions = "a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid\r\n" "a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id\r\n"; std::unique_ptr<SessionDescriptionInterface> answer = CreateSessionDescription(SdpType::kAnswer, sdp); EXPECT_FALSE(pc->SetRemoteDescription(std::move(answer))); auto answer_with_extensions = CreateSessionDescription(SdpType::kAnswer, sdp + extensions); EXPECT_TRUE(pc->SetRemoteDescription(std::move(answer_with_extensions))); // Tolerate the lack of mid/rid extensions in rejected m-lines. EXPECT_TRUE(pc->CreateOfferAndSetAsLocal()); auto rejected_answer = CreateSessionDescription( SdpType::kAnswer, absl::StrReplaceAll(sdp, {{"m=video 9 ", "m=video 0 "}})); EXPECT_TRUE(pc->SetRemoteDescription(std::move(rejected_answer))); } TEST_F(SdpOfferAnswerTest, SimulcastOfferWithMixedCodec) { auto pc = CreatePeerConnection("WebRTC-MixedCodecSimulcast/Enabled/"); std::optional<RtpCodecCapability> vp8_codec_capability = FindFirstSendCodecWithName(MediaType::VIDEO, kVp8CodecName); ASSERT_TRUE(vp8_codec_capability); std::optional<RtpCodecCapability> vp9_codec_capability = FindFirstSendCodecWithName(MediaType::VIDEO, kVp9CodecName); ASSERT_TRUE(vp9_codec_capability); RtpTransceiverInit init; RtpEncodingParameters rid1; rid1.rid = "1"; rid1.codec = *vp8_codec_capability; init.send_encodings.push_back(rid1); RtpEncodingParameters rid2; rid2.rid = "2"; rid2.codec = *vp9_codec_capability; init.send_encodings.push_back(rid2); auto transceiver = pc->AddTransceiver(MediaType::VIDEO, init); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); auto& offer_contents = offer->description()->contents(); auto send_codecs = offer_contents[0].media_description()->codecs(); // Verify that the serialized SDP includes pt=. std::string sdp; offer->ToString(&sdp); const Codec* vp8_send_codec = nullptr; const Codec* vp9_send_codec = nullptr; for (auto& codec : send_codecs) { if (codec.name == vp8_codec_capability->name && !vp8_send_codec) { vp8_send_codec = &codec; } if (codec.name == vp9_codec_capability->name && !vp9_send_codec) { vp9_send_codec = &codec; } } ASSERT_TRUE(vp8_send_codec); ASSERT_TRUE(vp9_send_codec); EXPECT_THAT(sdp, testing::HasSubstr("a=rid:1 send pt=" + std::to_string(vp8_send_codec->id))); EXPECT_THAT(sdp, testing::HasSubstr("a=rid:2 send pt=" + std::to_string(vp9_send_codec->id))); // Verify that SDP containing pt= can be parsed correctly. auto offer2 = CreateSessionDescription(SdpType::kOffer, sdp); auto& offer_contents2 = offer2->description()->contents(); auto send_rids2 = offer_contents2[0].media_description()->streams()[0].rids(); EXPECT_EQ(send_rids2[0].codecs.size(), 1u); EXPECT_EQ(send_rids2[0].codecs[0], *vp8_send_codec); EXPECT_EQ(send_rids2[1].codecs.size(), 1u); EXPECT_EQ(send_rids2[1].codecs[0], *vp9_send_codec); } TEST_F(SdpOfferAnswerTest, SimulcastAnswerWithPayloadType) { auto pc = CreatePeerConnection("WebRTC-MixedCodecSimulcast/Enabled/"); // A SDP offer with recv simulcast with payload type std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 97\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp:9 IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid\r\n" "a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id\r\n" "a=recvonly\r\n" "a=rtcp-mux\r\n" "a=rtcp-rsize\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rtpmap:97 VP9/90000\r\n" "a=rid:1 recv pt=96\r\n" "a=rid:2 recv pt=97\r\n" "a=simulcast:recv 1;2\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto transceiver = pc->pc()->GetTransceivers()[0]; EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kSendOnly) .ok()); // Check the generated SDP. std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswer(); answer->ToString(&sdp); EXPECT_THAT(sdp, testing::HasSubstr("a=rid:1 send pt=96\r\n")); EXPECT_THAT(sdp, testing::HasSubstr("a=rid:2 send pt=97\r\n")); EXPECT_TRUE(pc->SetLocalDescription(std::move(answer))); } TEST_F(SdpOfferAnswerTest, SimulcastOfferWithExcessiveRidsClamped) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp:9 IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid\r\n" "a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id\r\n" "a=recvonly\r\n" "a=rtcp-mux\r\n" "a=rtcp-rsize\r\n" "a=rtpmap:96 VP8/90000\r\n"; for (int i = 1; i <= 9; ++i) { sdp += "a=rid:" + std::to_string(i) + " recv\r\n"; } sdp += "a=simulcast:recv 1;2;3;4;5;6;7;8;9\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto transceiver = pc->pc()->GetTransceivers()[0]; // Verify that the number of send encodings is clamped to 3 // (kMaxSimulcastStreams) EXPECT_THAT(transceiver->sender()->GetParameters().encodings, SizeIs(3)); } TEST_F(SdpOfferAnswerTest, ExpectAllSsrcsSpecifiedInSsrcGroupFid) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 97\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:96 H264/90000\r\n" "a=fmtp:96 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n" "a=rtpmap:97 rtx/90000\r\n" "a=fmtp:97 apt=96\r\n" "a=ssrc-group:FID 1 2\r\n" "a=ssrc:1 cname:test\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); RTCError error; pc->SetRemoteDescription(std::move(offer), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, ExpectAllSsrcsSpecifiedInSsrcGroupFecFr) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 98\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:96 H264/90000\r\n" "a=fmtp:96 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n" "a=rtpmap:98 flexfec-03/90000\r\n" "a=fmtp:98 repair-window=10000000\r\n" "a=ssrc-group:FEC-FR 1 2\r\n" "a=ssrc:1 cname:test\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); RTCError error; pc->SetRemoteDescription(std::move(offer), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, ExpectTwoSsrcsInSsrcGroupFid) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 97\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:96 H264/90000\r\n" "a=fmtp:96 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n" "a=rtpmap:97 rtx/90000\r\n" "a=fmtp:97 apt=96\r\n" "a=ssrc-group:FID 1 2 3\r\n" "a=ssrc:1 cname:test\r\n" "a=ssrc:2 cname:test\r\n" "a=ssrc:3 cname:test\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); RTCError error; pc->SetRemoteDescription(std::move(offer), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, ExpectTwoSsrcsInSsrcGroupFecFr) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 98\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:96 H264/90000\r\n" "a=fmtp:96 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n" "a=rtpmap:98 flexfec-03/90000\r\n" "a=fmtp:98 repair-window=10000000\r\n" "a=ssrc-group:FEC-FR 1 2 3\r\n" "a=ssrc:1 cname:test\r\n" "a=ssrc:2 cname:test\r\n" "a=ssrc:3 cname:test\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); RTCError error; pc->SetRemoteDescription(std::move(offer), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, ExpectAtMostFourSsrcsInSsrcGroupSIM) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 97\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" "a=rtpmap:96 H264/90000\r\n" "a=fmtp:96 " "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=" "42e01f\r\n" "a=rtpmap:97 rtx/90000\r\n" "a=fmtp:97 apt=96\r\n" "a=ssrc-group:SIM 1 2 3 4\r\n" "a=ssrc:1 cname:test\r\n" "a=ssrc:2 cname:test\r\n" "a=ssrc:3 cname:test\r\n" "a=ssrc:4 cname:test\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); RTCError error; pc->SetRemoteDescription(std::move(offer), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, DuplicateSsrcsDisallowedInLocalDescription) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {}); pc->AddVideoTrack("video_track", {}); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); auto& offer_contents = offer->description()->contents(); ASSERT_EQ(offer_contents.size(), 2u); uint32_t second_ssrc = offer_contents[1].media_description()->first_ssrc(); offer->description() ->contents()[0] .media_description() ->mutable_streams()[0] .ssrcs[0] = second_ssrc; EXPECT_FALSE(pc->SetLocalDescription(std::move(offer))); } TEST_F(SdpOfferAnswerTest, DuplicateSsrcsAcrossMlinesDisallowedInLocalDescriptionTwoSsrc) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {}); pc->AddVideoTrack("video_track", {}); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); auto& offer_contents = offer->description()->contents(); ASSERT_EQ(offer_contents.size(), 2u); uint32_t audio_ssrc = offer_contents[0].media_description()->first_ssrc(); ASSERT_EQ(offer_contents[1].media_description()->streams().size(), 1u); auto& video_stream = offer->description() ->contents()[1] .media_description() ->mutable_streams()[0]; ASSERT_EQ(video_stream.ssrcs.size(), 2u); ASSERT_EQ(video_stream.ssrc_groups.size(), 1u); video_stream.ssrcs[1] = audio_ssrc; video_stream.ssrc_groups[0].ssrcs[1] = audio_ssrc; video_stream.ssrc_groups[0].semantics = kSimSsrcGroupSemantics; std::string sdp; offer->ToString(&sdp); // Trim the last two lines which contain ssrc-specific attributes // that we change/munge above. Guarded with expectation about what // should be removed in case the SDP generation changes. size_t end = sdp.rfind("\r\n"); end = sdp.rfind("\r\n", end - 2); end = sdp.rfind("\r\n", end - 2); EXPECT_EQ(sdp.substr(end + 2), "a=ssrc:" + absl::StrCat(audio_ssrc) + " cname:" + video_stream.cname + "\r\n" "a=ssrc:" + absl::StrCat(audio_ssrc) + " msid:- video_track\r\n"); auto modified_offer = CreateSessionDescription(SdpType::kOffer, sdp.substr(0, end + 2)); EXPECT_FALSE(pc->SetLocalDescription(std::move(modified_offer))); } TEST_F(SdpOfferAnswerTest, DuplicateSsrcsAcrossMlinesDisallowedInLocalDescriptionThreeSsrcs) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {}); pc->AddVideoTrack("video_track", {}); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); auto& offer_contents = offer->description()->contents(); ASSERT_EQ(offer_contents.size(), 2u); uint32_t audio_ssrc = offer_contents[0].media_description()->first_ssrc(); ASSERT_EQ(offer_contents[1].media_description()->streams().size(), 1u); auto& video_stream = offer->description() ->contents()[1] .media_description() ->mutable_streams()[0]; ASSERT_EQ(video_stream.ssrcs.size(), 2u); ASSERT_EQ(video_stream.ssrc_groups.size(), 1u); video_stream.ssrcs.push_back(audio_ssrc); video_stream.ssrc_groups[0].ssrcs.push_back(audio_ssrc); video_stream.ssrc_groups[0].semantics = kSimSsrcGroupSemantics; std::string sdp; offer->ToString(&sdp); // Trim the last two lines which contain ssrc-specific attributes // that we change/munge above. Guarded with expectation about what // should be removed in case the SDP generation changes. size_t end = sdp.rfind("\r\n"); end = sdp.rfind("\r\n", end - 2); end = sdp.rfind("\r\n", end - 2); EXPECT_EQ(sdp.substr(end + 2), "a=ssrc:" + absl::StrCat(audio_ssrc) + " cname:" + video_stream.cname + "\r\n" "a=ssrc:" + absl::StrCat(audio_ssrc) + " msid:- video_track\r\n"); auto modified_offer = CreateSessionDescription(SdpType::kOffer, sdp.substr(0, end + 2)); EXPECT_FALSE(pc->SetLocalDescription(std::move(modified_offer))); } TEST_F(SdpOfferAnswerTest, AllowOnlyOneSsrcGroupPerSemanticAndPrimarySsrc) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {}); pc->AddVideoTrack("video_track", {}); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); auto& offer_contents = offer->description()->contents(); ASSERT_EQ(offer_contents.size(), 2u); uint32_t audio_ssrc = offer_contents[0].media_description()->first_ssrc(); ASSERT_EQ(offer_contents[1].media_description()->streams().size(), 1u); auto& video_stream = offer->description() ->contents()[1] .media_description() ->mutable_streams()[0]; ASSERT_EQ(video_stream.ssrcs.size(), 2u); ASSERT_EQ(video_stream.ssrc_groups.size(), 1u); video_stream.ssrcs.push_back(audio_ssrc); video_stream.ssrc_groups.push_back( {kFidSsrcGroupSemantics, {video_stream.ssrcs[0], audio_ssrc}}); std::string sdp; offer->ToString(&sdp); // Trim the last two lines which contain ssrc-specific attributes // that we change/munge above. Guarded with expectation about what // should be removed in case the SDP generation changes. size_t end = sdp.rfind("\r\n"); end = sdp.rfind("\r\n", end - 2); end = sdp.rfind("\r\n", end - 2); EXPECT_EQ(sdp.substr(end + 2), "a=ssrc:" + absl::StrCat(audio_ssrc) + " cname:" + video_stream.cname + "\r\n" "a=ssrc:" + absl::StrCat(audio_ssrc) + " msid:- video_track\r\n"); auto modified_offer = CreateSessionDescription(SdpType::kOffer, sdp.substr(0, end + 2)); EXPECT_FALSE(pc->SetLocalDescription(std::move(modified_offer))); } TEST_F(SdpOfferAnswerTest, OfferWithRtxAndNoMsidIsNotRejected) { auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96 97\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp-mux\r\n" "a=sendonly\r\n" "a=mid:0\r\n" // "a=msid:stream obsoletetrack\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rtpmap:97 rtx/90000\r\n" "a=fmtp:97 apt=96\r\n" "a=ssrc-group:FID 1 2\r\n" "a=ssrc:1 cname:test\r\n" "a=ssrc:2 cname:test\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); } TEST_F(SdpOfferAnswerTest, RejectsAnswerWithInvalidTransport) { auto pc1 = CreatePeerConnection(); pc1->AddAudioTrack("audio_track", {}); auto pc2 = CreatePeerConnection(); pc2->AddAudioTrack("anotheraudio_track", {}); auto initial_offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_EQ(initial_offer->description()->contents().size(), 1u); std::string mid = initial_offer->description()->contents()[0].mid(); EXPECT_TRUE(pc2->SetRemoteDescription(std::move(initial_offer))); auto initial_answer = pc2->CreateAnswerAndSetAsLocal(); std::string sdp; initial_answer->ToString(&sdp); EXPECT_TRUE(pc1->SetRemoteDescription(std::move(initial_answer))); auto transceivers = pc1->pc()->GetTransceivers(); ASSERT_EQ(transceivers.size(), 1u); // This stops the only transport. transceivers[0]->StopStandard(); auto subsequent_offer = pc1->CreateOfferAndSetAsLocal(); // But the remote answers with a non-rejected m-line which is not valid. auto bad_answer = CreateSessionDescription( SdpType::kAnswer, absl::StrReplaceAll(sdp, {{"a=group:BUNDLE " + mid + "\r\n", ""}})); RTCError error; pc1->SetRemoteDescription(std::move(bad_answer), &error); EXPECT_FALSE(error.ok()); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); } TEST_F(SdpOfferAnswerTest, SdpMungingWithInvalidPayloadTypeIsRejected) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {}); std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); ASSERT_EQ(offer->description()->contents().size(), 1u); auto* audio = offer->description()->contents()[0].media_description(); ASSERT_GT(audio->codecs().size(), 0u); EXPECT_TRUE(audio->rtcp_mux()); auto codecs = audio->codecs(); for (int invalid_payload_type = 64; invalid_payload_type < 96; invalid_payload_type++) { codecs[0].id = invalid_payload_type; // The range [64-95] is disallowed with rtcp_mux. audio->set_codecs(codecs); // ASSERT to avoid getting into a bad state. ASSERT_FALSE(pc->SetLocalDescription(offer->Clone())); ASSERT_FALSE(pc->SetRemoteDescription(offer->Clone())); } } TEST_F(SdpOfferAnswerTest, MsidSignalingInSubsequentOfferAnswer) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {}); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=msid-semantic: WMS\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp:9 IN IP4 0.0.0.0\r\n" "a=recvonly\r\n" "a=rtcp-mux\r\n" "a=rtpmap:111 opus/48000/2\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); // Check the generated SDP. std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswer(); answer->ToString(&sdp); EXPECT_NE(std::string::npos, sdp.find("a=msid:- audio_track\r\n")); EXPECT_TRUE(pc->SetLocalDescription(std::move(answer))); // Check the local description object. auto local_description = pc->pc()->local_description(); ASSERT_EQ(local_description->description()->contents().size(), 1u); auto streams = local_description->description() ->contents()[0] .media_description() ->streams(); ASSERT_EQ(streams.size(), 1u); EXPECT_EQ(streams[0].id, "audio_track"); // Check the serialization of the local description. local_description->ToString(&sdp); EXPECT_NE(std::string::npos, sdp.find("a=msid:- audio_track\r\n")); } // Regression test for crbug.com/328522463 // where the stream parameters got recreated which changed the ssrc. TEST_F(SdpOfferAnswerTest, MsidSignalingUnknownRespondsWithMsidAndKeepsSsrc) { auto pc = CreatePeerConnection(); pc->AddAudioTrack("audio_track", {"default"}); std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" // "a=msid-semantic: WMS *\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp:9 IN IP4 0.0.0.0\r\n" "a=recvonly\r\n" "a=rtcp-mux\r\n" "a=mid:0\r\n" "a=rtpmap:111 opus/48000/2\r\n"; std::unique_ptr<SessionDescriptionInterface> offer = CreateSessionDescription(SdpType::kOffer, sdp); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto first_transceiver = pc->pc()->GetTransceivers()[0]; EXPECT_TRUE(first_transceiver ->SetDirectionWithError(RtpTransceiverDirection::kSendOnly) .ok()); // Check the generated *serialized* SDP. std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswer(); const auto& answer_contents = answer->description()->contents(); ASSERT_EQ(answer_contents.size(), 1u); auto answer_streams = answer_contents[0].media_description()->streams(); ASSERT_EQ(answer_streams.size(), 1u); std::string first_stream_serialized = answer_streams[0].ToString(); uint32_t first_ssrc = answer_contents[0].media_description()->first_ssrc(); answer->ToString(&sdp); EXPECT_TRUE( pc->SetLocalDescription(CreateSessionDescription(SdpType::kAnswer, sdp))); auto reoffer = pc->CreateOffer(); const auto& offer_contents = reoffer->description()->contents(); ASSERT_EQ(offer_contents.size(), 1u); auto offer_streams = offer_contents[0].media_description()->streams(); ASSERT_EQ(offer_streams.size(), 1u); std::string second_stream_serialized = offer_streams[0].ToString(); uint32_t second_ssrc = offer_contents[0].media_description()->first_ssrc(); EXPECT_EQ(first_ssrc, second_ssrc); EXPECT_EQ(first_stream_serialized, second_stream_serialized); EXPECT_TRUE(pc->SetLocalDescription(std::move(reoffer))); } // Runs for each payload type in the valid dynamic ranges. class SdpOfferAnswerWithPayloadTypeTest : public SdpOfferAnswerTest, public testing::WithParamInterface<int> { public: static std::vector<int> GetAllPayloadTypesInValidDynamicRange() { std::vector<int> payload_types; // The lower range is [35, 63]. for (int pt = 35; pt <= 63; ++pt) { payload_types.push_back(pt); } // The upper range is [96, 127]. for (int pt = 96; pt <= 127; ++pt) { payload_types.push_back(pt); } return payload_types; } }; TEST_P(SdpOfferAnswerWithPayloadTypeTest, FollowUpOfferDoesNotRepurposePayloadType) { int payload_type = GetParam(); std::string payload_type_str = absl::StrCat(payload_type); auto pc = CreatePeerConnection(); std::string sdp = "v=0\r\n" "o=- 8506393630701383055 2 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0\r\n" "a=extmap-allow-mixed\r\n" "a=msid-semantic: WMS\r\n" "m=video 9 UDP/TLS/RTP/SAVPF " + payload_type_str + "\r\n" "c=IN IP4 0.0.0.0\r\n" "a=rtcp:9 IN IP4 0.0.0.0\r\n" "a=ice-ufrag:7ZPs\r\n" "a=ice-pwd:3/ZaqZrZaVzg1Tfju5x3CGeJ\r\n" "a=ice-options:trickle\r\n" "a=fingerprint:sha-256 7D:29:C5:B8:D2:30:57:F3:0D:CA:0A:8E:4B:6A:AE:53:26" ":9F:14:DF:47:8E:0C:A3:EC:8D:B1:71:B5:D5:5A:9C\r\n" "a=setup:actpass\r\n" "a=mid:0\r\n" "a=extmap:9 urn:ietf:params:rtp-hdrext:sdes:mid\r\n" "a=sendrecv\r\n" "a=msid:- e2628265-b712-40de-81c9-76d49b7079a0\r\n" "a=rtcp-mux\r\n" "a=rtcp-rsize\r\n" "a=rtpmap:" + payload_type_str + " VP9/90000\r\n" "a=rtcp-fb:" + payload_type_str + " goog-remb\r\n" "a=rtcp-fb:" + payload_type_str + " transport-cc\r\n" "a=rtcp-fb:" + payload_type_str + " ccm fir\r\n" "a=rtcp-fb:" + payload_type_str + " nack\r\n" "a=rtcp-fb:" + payload_type_str + " nack pli\r\n" "a=fmtp:" + payload_type_str + " profile-id=0\r\n" "a=ssrc:2245042191 cname:A206VC6FXsn47EwJ\r\n" "a=ssrc:2245042191 msid:- e2628265-b712-40de-81c9-76d49b7079a0\r\n"; // Set remote offer with given PT for VP9. EXPECT_TRUE( pc->SetRemoteDescription(CreateSessionDescription(SdpType::kOffer, sdp))); // The answer should accept the PT for VP9. std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswer(); { const auto* mid_0 = answer->description()->GetContentDescriptionByName("0"); ASSERT_TRUE(mid_0); ASSERT_THAT(mid_0->codecs(), SizeIs(1)); const auto& codec = mid_0->codecs()[0]; EXPECT_EQ(codec.name, "VP9"); EXPECT_EQ(codec.id, payload_type); std::string param; EXPECT_TRUE(codec.GetParam("profile-id", ¶m)); EXPECT_EQ(param, "0"); } EXPECT_TRUE(pc->SetLocalDescription(std::move(answer))); // The follow-up offer should continue to use the same PT for VP9. std::unique_ptr<SessionDescriptionInterface> offer = pc->CreateOffer(); { const auto* mid_0 = offer->description()->GetContentDescriptionByName("0"); ASSERT_TRUE(mid_0); // We should have more codecs to offer than the one previously negotiated. const auto& codecs = mid_0->codecs(); ASSERT_GT(codecs.size(), 1u); // The previously negotiated PT should still map to the same VP9 codec. auto it = std::find_if( codecs.begin(), codecs.end(), [&](const Codec& codec) { return codec.id == payload_type; }); ASSERT_TRUE(it != codecs.end()); const auto& vp9_codec = *it; EXPECT_EQ(vp9_codec.name, "VP9"); EXPECT_EQ(vp9_codec.id, payload_type); std::string param; EXPECT_TRUE(vp9_codec.GetParam("profile-id", ¶m)); EXPECT_EQ(param, "0"); // None of the other codecs should collide with our VP9 PT. for (const auto& codec : codecs) { if (codec == vp9_codec) { continue; } EXPECT_NE(codec.id, vp9_codec.id); } } // Last sanity check: it's always possible to set an unmunged local offer. EXPECT_TRUE(pc->SetLocalDescription(std::move(offer))); } INSTANTIATE_TEST_SUITE_P( SdpOfferAnswerWithPayloadTypeTest, SdpOfferAnswerWithPayloadTypeTest, ::testing::ValuesIn(SdpOfferAnswerWithPayloadTypeTest:: GetAllPayloadTypesInValidDynamicRange()), ::testing::PrintToStringParamName()); // Test variant with boolean order for audio-video and video-audio. class SdpOfferAnswerShuffleMediaTypes : public SdpOfferAnswerTest, public testing::WithParamInterface<bool> { public: SdpOfferAnswerShuffleMediaTypes() : SdpOfferAnswerTest() {} }; TEST_P(SdpOfferAnswerShuffleMediaTypes, RecyclingWithDifferentKindAndSameMidFailsAnswer) { bool audio_first = GetParam(); auto pc1 = CreatePeerConnection(); auto pc2 = CreatePeerConnection(); if (audio_first) { pc1->AddAudioTrack("audio_track", {}); pc2->AddVideoTrack("video_track", {}); } else { pc2->AddAudioTrack("audio_track", {}); pc1->AddVideoTrack("video_track", {}); } auto initial_offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_EQ(initial_offer->description()->contents().size(), 1u); auto mid1 = initial_offer->description()->contents()[0].mid(); std::string rejected_answer_sdp = "v=0\r\n" "o=- 8621259572628890423 2 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "m=" + std::string(audio_first ? "audio" : "video") + " 0 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n"; auto rejected_answer = CreateSessionDescription(SdpType::kAnswer, rejected_answer_sdp); EXPECT_TRUE(pc1->SetRemoteDescription(std::move(rejected_answer))); std::unique_ptr<SessionDescriptionInterface> offer = pc2->CreateOfferAndSetAsLocal(); // This will generate a mid=0 too ASSERT_EQ(offer->description()->contents().size(), 1u); auto mid2 = offer->description()->contents()[0].mid(); EXPECT_EQ(mid1, mid2); // Check that the mids collided. EXPECT_TRUE(pc1->SetRemoteDescription(std::move(offer))); std::unique_ptr<SessionDescriptionInterface> answer = pc1->CreateAnswer(); EXPECT_FALSE(pc1->SetLocalDescription(std::move(answer))); } // Similar to the previous test but with implicit rollback and creating // an offer, triggering a different codepath. TEST_P(SdpOfferAnswerShuffleMediaTypes, RecyclingWithDifferentKindAndSameMidFailsOffer) { bool audio_first = GetParam(); auto pc1 = CreatePeerConnection(); auto pc2 = CreatePeerConnection(); if (audio_first) { pc1->AddAudioTrack("audio_track", {}); pc2->AddVideoTrack("video_track", {}); } else { pc2->AddAudioTrack("audio_track", {}); pc1->AddVideoTrack("video_track", {}); } auto initial_offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_EQ(initial_offer->description()->contents().size(), 1u); auto mid1 = initial_offer->description()->contents()[0].mid(); std::string rejected_answer_sdp = "v=0\r\n" "o=- 8621259572628890423 2 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "m=" + std::string(audio_first ? "audio" : "video") + " 0 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n"; auto rejected_answer = CreateSessionDescription(SdpType::kAnswer, rejected_answer_sdp); EXPECT_TRUE(pc1->SetRemoteDescription(std::move(rejected_answer))); std::unique_ptr<SessionDescriptionInterface> offer = pc2->CreateOfferAndSetAsLocal(); // This will generate a mid=0 too ASSERT_EQ(offer->description()->contents().size(), 1u); auto mid2 = offer->description()->contents()[0].mid(); EXPECT_EQ(mid1, mid2); // Check that the mids collided. EXPECT_TRUE(pc1->SetRemoteDescription(std::move(offer))); EXPECT_FALSE(pc1->CreateOffer()); } INSTANTIATE_TEST_SUITE_P(SdpOfferAnswerShuffleMediaTypes, SdpOfferAnswerShuffleMediaTypes, ::testing::Values(true, false)); TEST_F(SdpOfferAnswerTest, OfferWithNoCompatibleCodecsIsRejectedInAnswer) { auto pc = CreatePeerConnection(); // An offer with no common codecs. This should reject both contents // in the answer without throwing an error. std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 9 RTP/SAVPF 97\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sendrecv\r\n" "a=rtpmap:97 x-unknown/90000\r\n" "a=rtcp-mux\r\n" "m=video 9 RTP/SAVPF 98\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sendrecv\r\n" "a=rtpmap:98 H263-1998/90000\r\n" "a=fmtp:98 CIF=1;QCIF=1\r\n" "a=rtcp-mux\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswer(); auto answer_contents = answer->description()->contents(); ASSERT_EQ(answer_contents.size(), 2u); EXPECT_EQ(answer_contents[0].rejected, true); EXPECT_EQ(answer_contents[1].rejected, true); } TEST_F(SdpOfferAnswerTest, OfferWithRejectedMlineWithoutFingerprintIsAccepted) { auto pc = CreatePeerConnection(); // A rejected m-line without fingerprint. // The answer does not require one. std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "m=audio 0 RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sendrecv\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=rtcp-mux\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswer(); EXPECT_TRUE(pc->SetLocalDescription(std::move(answer))); } TEST_F(SdpOfferAnswerTest, MidBackfillAnswer) { auto pc = CreatePeerConnection(); // An offer without a mid backfills the mid. This is currently // done with a per-peerconnection counter that starts from 0. // JSEP says to only include the mid in the answer if it was in the offer // but due to backfill it is always present. // TODO: https://issues.webrtc.org/issues/338529222 - don't respond with mid. std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "m=audio 9 RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sendrecv\r\n" "a=rtpmap:111 opus/48000/2\r\n" // "a=mid:0\r\n" "a=rtcp-mux\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); auto offer_contents = pc->pc()->remote_description()->description()->contents(); ASSERT_EQ(offer_contents.size(), 1u); EXPECT_EQ(offer_contents[0].mid(), "0"); std::unique_ptr<SessionDescriptionInterface> answer = pc->CreateAnswerAndSetAsLocal(); auto answer_contents = answer->description()->contents(); ASSERT_EQ(answer_contents.size(), 1u); EXPECT_EQ(answer_contents[0].mid(), offer_contents[0].mid()); } TEST_F(SdpOfferAnswerTest, MidBackfillDoesNotCheckAgainstBundleGroup) { auto pc = CreatePeerConnection(); // An offer with a BUNDLE group specifying a mid that is not present // in the offer. This is not rejected due to the mid being backfilled // starting at 0. // TODO: https://issues.webrtc.org/issues/338528603 - reject this. std::string sdp = "v=0\r\n" "o=- 0 3 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=setup:actpass\r\n" "a=ice-ufrag:ETEn\r\n" "a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l\r\n" "a=fingerprint:sha-1 " "4A:AD:B9:B1:3F:82:18:3B:54:02:12:DF:3E:5D:49:6B:19:E5:7C:AB\r\n" "a=setup:actpass\r\n" "a=group:BUNDLE 0\r\n" "m=audio 9 RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sendrecv\r\n" "a=rtpmap:111 opus/48000/2\r\n" // "a=mid:0\r\n" "a=rtcp-mux\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); RTCError error; pc->SetRemoteDescription(std::move(desc), &error); EXPECT_TRUE(error.ok()); EXPECT_TRUE(pc->CreateAnswerAndSetAsLocal()); } TEST_F(SdpOfferAnswerTest, ReducedSizeNegotiated) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto audio_transceiver = caller->AddTransceiver(MediaType::AUDIO); auto video_transceiver = caller->AddTransceiver(MediaType::VIDEO); ASSERT_TRUE(caller->ExchangeOfferAnswerWith(callee.get())); auto receivers = callee->pc()->GetReceivers(); ASSERT_EQ(receivers.size(), 2u); auto audio_recv_param = receivers[0]->GetParameters(); EXPECT_TRUE(audio_recv_param.rtcp.reduced_size); auto video_recv_param = receivers[1]->GetParameters(); EXPECT_TRUE(video_recv_param.rtcp.reduced_size); auto senders = caller->pc()->GetSenders(); ASSERT_EQ(senders.size(), 2u); auto audio_send_param = senders[0]->GetParameters(); EXPECT_TRUE(audio_send_param.rtcp.reduced_size); auto video_send_param = senders[1]->GetParameters(); EXPECT_TRUE(video_send_param.rtcp.reduced_size); } TEST_F(SdpOfferAnswerTest, ReducedSizeNotNegotiated) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto audio_transceiver = caller->AddTransceiver(MediaType::AUDIO); auto video_transceiver = caller->AddTransceiver(MediaType::VIDEO); std::unique_ptr<SessionDescriptionInterface> offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); std::string sdp; offer->ToString(&sdp); // Remove rtcp-rsize attribute. auto modified_offer = CreateSessionDescription( SdpType::kOffer, absl::StrReplaceAll(sdp, {{"a=rtcp-rsize\r\n", ""}})); EXPECT_TRUE(callee->SetRemoteDescription(std::move(modified_offer))); std::unique_ptr<SessionDescriptionInterface> answer = callee->CreateAnswerAndSetAsLocal(); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); auto receivers = callee->pc()->GetReceivers(); ASSERT_EQ(receivers.size(), 2u); auto audio_recv_param = receivers[0]->GetParameters(); EXPECT_FALSE(audio_recv_param.rtcp.reduced_size); auto video_recv_param = receivers[1]->GetParameters(); EXPECT_FALSE(video_recv_param.rtcp.reduced_size); auto senders = caller->pc()->GetSenders(); ASSERT_EQ(senders.size(), 2u); auto audio_send_param = senders[0]->GetParameters(); EXPECT_FALSE(audio_send_param.rtcp.reduced_size); auto video_send_param = senders[1]->GetParameters(); EXPECT_FALSE(video_send_param.rtcp.reduced_size); } TEST_F(SdpOfferAnswerTest, PayloadTypeMatchingWithSubsequentOfferAnswer) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); // 1. Restrict codecs and set a local description and remote description. // with a different payload type. auto video_transceiver = caller->AddTransceiver(MediaType::VIDEO); std::vector<RtpCodecCapability> codec_caps = pc_factory_->GetRtpReceiverCapabilities(MediaType::VIDEO).codecs; std::erase_if(codec_caps, [](const RtpCodecCapability& codec) { return !absl::EqualsIgnoreCase(codec.name, "VP8"); }); EXPECT_TRUE(video_transceiver->SetCodecPreferences(codec_caps).ok()); auto offer1 = caller->CreateOfferAndSetAsLocal(); // 2. Add additional supported but not offered codec before SRD auto& contents = offer1->description()->contents(); ASSERT_EQ(contents.size(), 1u); auto* media_description = contents[0].media_description(); ASSERT_TRUE(media_description); std::vector<Codec> codecs = media_description->codecs(); ASSERT_EQ(codecs.size(), 1u); ASSERT_NE(codecs[0].id, 127); auto av1 = CreateVideoCodec(SdpVideoFormat("AV1", {})); av1.id = 127; codecs.insert(codecs.begin(), av1); media_description->set_codecs(codecs); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer1))); auto answer1 = callee->CreateAnswerAndSetAsLocal(); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer1))); // 3. sCP to reenable that codec. Payload type is not matched at this point. codec_caps = pc_factory_->GetRtpReceiverCapabilities(MediaType::VIDEO).codecs; std::erase_if(codec_caps, [](const RtpCodecCapability& codec) { return !(absl::EqualsIgnoreCase(codec.name, "VP8") || absl::EqualsIgnoreCase(codec.name, "AV1")); }); EXPECT_TRUE(video_transceiver->SetCodecPreferences(codec_caps).ok()); auto offer2 = caller->CreateOffer(); auto& contents2 = offer2->description()->contents(); ASSERT_EQ(contents2.size(), 1u); auto* media_description2 = contents2[0].media_description(); codecs = media_description2->codecs(); ASSERT_EQ(codecs.size(), 2u); EXPECT_EQ(codecs[1].name, av1.name); // At this point, the value 127 may or may not have been chosen. // 4. O/A triggered by remote. This "locks in" the payload type. auto offer3 = callee->CreateOfferAndSetAsLocal(); EXPECT_TRUE(caller->SetRemoteDescription(std::move(offer3))); EXPECT_TRUE(caller->CreateAnswerAndSetAsLocal()); // 5. Subsequent offer has the payload type. auto offer4 = caller->CreateOfferAndSetAsLocal(); auto& contents4 = offer4->description()->contents(); ASSERT_EQ(contents4.size(), 1u); auto* media_description4 = contents4[0].media_description(); ASSERT_TRUE(media_description4); codecs = media_description4->codecs(); ASSERT_EQ(codecs.size(), 2u); EXPECT_EQ(codecs[1].name, av1.name); EXPECT_EQ(codecs[1].id, av1.id); } TEST_F(SdpOfferAnswerTest, TransceiverReceptive) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kRecvOnly) .ok()); EXPECT_FALSE(transceiver->receptive()); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(transceiver->receptive()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); ASSERT_THAT(callee->pc()->GetTransceivers(), SizeIs(1)); auto callee_transceiver = callee->pc()->GetTransceivers()[0]; EXPECT_FALSE(callee_transceiver->receptive()); EXPECT_TRUE(callee_transceiver ->SetDirectionWithError(RtpTransceiverDirection::kSendRecv) .ok()); auto answer = callee->CreateAnswerAndSetAsLocal(); EXPECT_FALSE(callee_transceiver->receptive()); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_TRUE(transceiver->receptive()); // Renegotiate, switching roles. EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kSendOnly) .ok()); EXPECT_TRUE(transceiver->receptive()); auto reoffer = caller->CreateOfferAndSetAsLocal(); EXPECT_FALSE(transceiver->receptive()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(reoffer))); ASSERT_THAT(callee->pc()->GetTransceivers(), SizeIs(1)); EXPECT_FALSE(callee_transceiver->receptive()); auto reanswer = callee->CreateAnswerAndSetAsLocal(); EXPECT_TRUE(callee_transceiver->receptive()); EXPECT_TRUE(caller->SetRemoteDescription(std::move(reanswer))); EXPECT_FALSE(transceiver->receptive()); } TEST_F(SdpOfferAnswerTest, TransceiverReceptiveInactive) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kRecvOnly) .ok()); EXPECT_FALSE(transceiver->receptive()); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(transceiver->receptive()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); ASSERT_THAT(callee->pc()->GetTransceivers(), SizeIs(1)); auto callee_transceiver = callee->pc()->GetTransceivers()[0]; EXPECT_FALSE(callee_transceiver->receptive()); EXPECT_TRUE(callee_transceiver ->SetDirectionWithError(RtpTransceiverDirection::kInactive) .ok()); auto answer = callee->CreateAnswerAndSetAsLocal(); EXPECT_FALSE(callee_transceiver->receptive()); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_FALSE(transceiver->receptive()); } TEST_F(SdpOfferAnswerTest, TransceiverReceptiveRollback) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kRecvOnly) .ok()); EXPECT_FALSE(transceiver->receptive()); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(transceiver->receptive()); auto rollback = caller->CreateRollback(); ASSERT_THAT(rollback, NotNull()); EXPECT_TRUE(caller->SetLocalDescription(std::move(rollback))); EXPECT_FALSE(transceiver->receptive()); } TEST_F(SdpOfferAnswerTest, TransceiverReceptiveRollbackAfterFullNegotiation) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kInactive) .ok()); EXPECT_FALSE(transceiver->receptive()); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_FALSE(transceiver->receptive()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_FALSE(transceiver->receptive()); EXPECT_TRUE( transceiver->SetDirectionWithError(RtpTransceiverDirection::kSendRecv) .ok()); auto reoffer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(transceiver->receptive()); auto rollback = caller->CreateRollback(); ASSERT_THAT(rollback, NotNull()); EXPECT_TRUE(caller->SetLocalDescription(std::move(rollback))); EXPECT_FALSE(transceiver->receptive()); } TEST_F(SdpOfferAnswerTest, TransceiverReceptiveRollbackAfterFullNegotiationRemote) { auto callee = CreatePeerConnection(); callee->AddVideoTrack("a"); auto caller = CreatePeerConnection(); caller->AddAudioTrack("b"); caller->AddVideoTrack("c"); EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOfferAndSetAsLocal())); EXPECT_TRUE( caller->SetRemoteDescription(callee->CreateAnswerAndSetAsLocal())); // In stable don't add or remove anything. callee->observer()->clear_legacy_renegotiation_needed(); callee->observer()->clear_latest_negotiation_needed_event(); ASSERT_THAT(caller->pc()->GetTransceivers(), SizeIs(2)); auto caller_transceiver = caller->pc()->GetTransceivers()[1]; EXPECT_TRUE(caller_transceiver ->SetDirectionWithError(RtpTransceiverDirection::kInactive) .ok()); ASSERT_THAT(callee->pc()->GetTransceivers(), SizeIs(2)); auto callee_transceiver = callee->pc()->GetTransceivers()[0]; EXPECT_TRUE(callee_transceiver->receptive()); EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer())); EXPECT_FALSE(callee_transceiver->receptive()); EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback())); EXPECT_TRUE(callee_transceiver->receptive()); } #ifdef WEBRTC_HAVE_SCTP TEST_F(SdpOfferAnswerTest, SctpInitDisabled) { auto pc1 = CreatePeerConnection("WebRTC-Sctp-Snap/Disabled/"); auto pc2 = CreatePeerConnection("WebRTC-Sctp-Snap/Disabled/"); EXPECT_TRUE(pc1->pc()->CreateDataChannelOrError("dc", nullptr).ok()); auto offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); { auto& contents = offer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); auto* media_description = contents[0].media_description(); ASSERT_THAT(media_description, NotNull()); auto* sctp_description = media_description->as_sctp(); ASSERT_THAT(sctp_description, NotNull()); EXPECT_FALSE(sctp_description->sctp_init()); } RTCError error; EXPECT_TRUE(pc2->SetRemoteDescription(std::move(offer))); auto answer = pc2->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer, NotNull()); { auto& contents = answer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); auto* media_description = contents[0].media_description(); ASSERT_THAT(media_description, NotNull()); auto* sctp_description = media_description->as_sctp(); ASSERT_THAT(sctp_description, NotNull()); EXPECT_FALSE(sctp_description->sctp_init()); } EXPECT_TRUE(pc1->SetRemoteDescription(std::move(answer))); } TEST_F(SdpOfferAnswerTest, SctpInitWithTrial) { auto pc1 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); auto pc2 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); EXPECT_TRUE(pc1->pc()->CreateDataChannelOrError("dc", nullptr).ok()); auto offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); { auto& contents = offer->description()->contents(); ASSERT_EQ(contents.size(), 1u); auto* media_description = contents[0].media_description(); ASSERT_TRUE(media_description); auto* sctp_description = media_description->as_sctp(); ASSERT_TRUE(sctp_description); EXPECT_TRUE(sctp_description->sctp_init()); } RTCError error; EXPECT_TRUE(pc2->SetRemoteDescription(std::move(offer))); auto answer = pc2->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer, NotNull()); { auto& contents = answer->description()->contents(); ASSERT_EQ(contents.size(), 1u); auto* media_description = contents[0].media_description(); ASSERT_TRUE(media_description); auto* sctp_description = media_description->as_sctp(); ASSERT_TRUE(sctp_description); EXPECT_TRUE(sctp_description->sctp_init()); } EXPECT_TRUE(pc1->SetRemoteDescription(std::move(answer))); } TEST_F(SdpOfferAnswerTest, AnswerNoSctpInitInOffer) { auto pc = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 **-----**\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sctp-port:5000\r\n" "a=max-message-size:262144\r\n" // a=sctp-init:cookiemonster\r\n" // no sctp-init present. "a=mid:0\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); ASSERT_NE(desc, nullptr); EXPECT_TRUE(pc->SetRemoteDescription(std::move(desc))); auto answer = pc->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer, NotNull()); EXPECT_TRUE(answer->ToString(&sdp)); auto& contents = answer->description()->contents(); ASSERT_EQ(contents.size(), 1u); auto* media_description = contents[0].media_description(); ASSERT_TRUE(media_description); auto* sctp_description = media_description->as_sctp(); ASSERT_TRUE(sctp_description); EXPECT_FALSE(sctp_description->sctp_init()); } TEST_F(SdpOfferAnswerTest, AnswerNonBase64SctpInit) { std::string sdp = "v=0\r\n" "o=- 4131505339648218884 3 IN IP4 **-----**\r\n" "s=-\r\n" "t=0 0\r\n" "a=ice-ufrag:zGWFZ+fVXDeN6UoI/136\r\n" "a=ice-pwd:9AUNgUqRNI5LSIrC1qFD2iTR\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "a=setup:passive\r\n" "m=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\n" "c=IN IP4 0.0.0.0\r\n" "a=sctp-port:5000\r\n" "a=max-message-size:262144\r\n" "a=sctp-init:not valid base64\r\n" "a=mid:0\r\n"; auto desc = CreateSessionDescription(SdpType::kOffer, sdp); EXPECT_EQ(desc, nullptr); } TEST_F(SdpOfferAnswerTest, AnswerFromNewPeerAfterProvisionalAnswerFailsSnapSctpInit) { auto pc1 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); auto pc2 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); auto pc3 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); EXPECT_TRUE(pc1->pc()->CreateDataChannelOrError("dc", nullptr).ok()); auto offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); EXPECT_TRUE(pc2->SetRemoteDescription(offer->Clone())); EXPECT_TRUE(pc3->SetRemoteDescription(std::move(offer))); auto answer2 = pc2->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer2, NotNull()); std::string sdp; answer2->ToString(&sdp); auto pranswer2 = CreateSessionDescription(SdpType::kPrAnswer, sdp); EXPECT_TRUE(pc1->SetRemoteDescription(std::move(pranswer2))); // Changing the sctp-init is not supported currently. auto answer3 = pc3->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer3, NotNull()); EXPECT_FALSE(pc1->SetRemoteDescription(std::move(answer3))); } TEST_F(SdpOfferAnswerTest, SubsequentOfferDoesNotAddSctpInit) { auto pc1 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); auto pc2 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); EXPECT_TRUE(pc1->pc()->CreateDataChannelOrError("dc", nullptr).ok()); auto offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); // Remove the sctp-init. { auto& contents = offer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); auto* media_description = contents[0].media_description(); ASSERT_THAT(media_description, NotNull()); auto* sctp_description = media_description->as_sctp(); ASSERT_THAT(sctp_description, NotNull()); EXPECT_TRUE(sctp_description->sctp_init()); sctp_description->set_sctp_init(std::nullopt); } EXPECT_TRUE(pc2->SetRemoteDescription(std::move(offer))); auto answer = pc2->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer, NotNull()); EXPECT_TRUE(pc1->SetRemoteDescription(std::move(answer))); auto reoffer = pc2->CreateOfferAndSetAsLocal(); // Check that there is no sctp-init. { auto& contents = reoffer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); auto* media_description = contents[0].media_description(); ASSERT_THAT(media_description, NotNull()); auto* sctp_description = media_description->as_sctp(); ASSERT_THAT(sctp_description, NotNull()); EXPECT_FALSE(sctp_description->sctp_init()); } EXPECT_TRUE(pc1->SetRemoteDescription(std::move(reoffer))); } TEST_F(SdpOfferAnswerTest, SubsequentOfferDoesNotNegotiateSctpInit) { auto pc1 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); auto pc2 = CreatePeerConnection("WebRTC-Sctp-Snap/Enabled/"); EXPECT_TRUE(pc1->pc()->CreateDataChannelOrError("dc", nullptr).ok()); auto offer = pc1->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer, NotNull()); // Remove the sctp-init. { auto& contents = offer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); auto* media_description = contents[0].media_description(); ASSERT_THAT(media_description, NotNull()); auto* sctp_description = media_description->as_sctp(); ASSERT_THAT(sctp_description, NotNull()); EXPECT_TRUE(sctp_description->sctp_init()); sctp_description->set_sctp_init(std::nullopt); } EXPECT_TRUE(pc2->SetRemoteDescription(std::move(offer))); auto answer = pc2->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer, NotNull()); EXPECT_TRUE(pc1->SetRemoteDescription(std::move(answer))); auto reoffer = pc2->CreateOfferAndSetAsLocal(); // Check that there is no sctp-init and add one. { auto& contents = reoffer->description()->contents(); ASSERT_THAT(contents, SizeIs(1)); auto* media_description = contents[0].media_description(); ASSERT_THAT(media_description, NotNull()); auto* sctp_description = media_description->as_sctp(); ASSERT_THAT(sctp_description, NotNull()); EXPECT_FALSE(sctp_description->sctp_init()); // Example sctp-init from // draft-hancke-tsvwg-snap.html#section-4.1 std::vector<uint8_t> example_init = { 0x01, 0x00, 0x00, 0x1e, 0x89, 0x6c, 0xdd, 0x1d, 0x00, 0x50, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x79, 0x65, 0x1d, 0xc0, 0x00, 0x00, 0x04, 0x80, 0x08, 0x00, 0x06, 0x82, 0xc0}; sctp_description->set_sctp_init(example_init); } EXPECT_FALSE(pc1->SetRemoteDescription(std::move(reoffer))); } #endif // WEBRTC_HAVE_SCTP class SdpOfferAnswerDirectionTest : public SdpOfferAnswerTest, public testing::WithParamInterface< std::tuple<RtpTransceiverDirection, RtpTransceiverDirection, bool>> { public: SdpOfferAnswerDirectionTest() : SdpOfferAnswerTest() {} }; TEST_P(SdpOfferAnswerDirectionTest, IncompatibleDirection) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE(transceiver->SetDirectionWithError(std::get<0>(GetParam())).ok()); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); ASSERT_THAT(callee->pc()->GetTransceivers(), SizeIs(1)); auto callee_transceiver = callee->pc()->GetTransceivers()[0]; EXPECT_TRUE(callee_transceiver ->SetDirectionWithError(RtpTransceiverDirection::kInactive) .ok()); auto answer = callee->CreateAnswerAndSetAsLocal(); // Modify the answer. ASSERT_THAT(answer->description()->contents(), SizeIs(1)); ContentInfo& content = answer->description()->contents()[0]; EXPECT_EQ(content.media_description()->direction(), RtpTransceiverDirection::kInactive); content.media_description()->set_direction(std::get<1>(GetParam())); EXPECT_EQ(caller->SetRemoteDescription(std::move(answer)), std::get<2>(GetParam())); } TEST_P(SdpOfferAnswerDirectionTest, IncompatibleDirectionRejected) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::VIDEO); EXPECT_TRUE(transceiver->SetDirectionWithError(std::get<0>(GetParam())).ok()); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); ASSERT_THAT(callee->pc()->GetTransceivers(), SizeIs(1)); auto callee_transceiver = callee->pc()->GetTransceivers()[0]; EXPECT_TRUE(callee_transceiver ->SetDirectionWithError(RtpTransceiverDirection::kInactive) .ok()); auto answer = callee->CreateAnswerAndSetAsLocal(); // Modify the answer and reject it. This can happen e.g. with // a rejected m-line that lacks a direction which defaults to "sendrecv". ASSERT_THAT(answer->description()->contents(), SizeIs(1)); ContentInfo& content = answer->description()->contents()[0]; EXPECT_EQ(content.media_description()->direction(), RtpTransceiverDirection::kInactive); content.media_description()->set_direction(std::get<1>(GetParam())); content.rejected = true; EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); } INSTANTIATE_TEST_SUITE_P(SdpOfferAnswerDirectionTest, SdpOfferAnswerDirectionTest, ::testing::Values( // sendrecv. std::make_tuple(RtpTransceiverDirection::kSendRecv, RtpTransceiverDirection::kSendRecv, true), std::make_tuple(RtpTransceiverDirection::kSendRecv, RtpTransceiverDirection::kSendOnly, true), std::make_tuple(RtpTransceiverDirection::kSendRecv, RtpTransceiverDirection::kRecvOnly, true), std::make_tuple(RtpTransceiverDirection::kSendRecv, RtpTransceiverDirection::kInactive, true), // sendonly. std::make_tuple(RtpTransceiverDirection::kSendOnly, RtpTransceiverDirection::kSendRecv, false), std::make_tuple(RtpTransceiverDirection::kSendOnly, RtpTransceiverDirection::kSendOnly, false), std::make_tuple(RtpTransceiverDirection::kSendOnly, RtpTransceiverDirection::kRecvOnly, true), std::make_tuple(RtpTransceiverDirection::kSendOnly, RtpTransceiverDirection::kInactive, true), // recvonly. std::make_tuple(RtpTransceiverDirection::kRecvOnly, RtpTransceiverDirection::kSendRecv, false), std::make_tuple(RtpTransceiverDirection::kRecvOnly, RtpTransceiverDirection::kSendOnly, true), std::make_tuple(RtpTransceiverDirection::kRecvOnly, RtpTransceiverDirection::kRecvOnly, false), std::make_tuple(RtpTransceiverDirection::kRecvOnly, RtpTransceiverDirection::kInactive, true), // inactive. std::make_tuple(RtpTransceiverDirection::kInactive, RtpTransceiverDirection::kSendRecv, false), std::make_tuple(RtpTransceiverDirection::kInactive, RtpTransceiverDirection::kSendOnly, false), std::make_tuple(RtpTransceiverDirection::kInactive, RtpTransceiverDirection::kRecvOnly, false), std::make_tuple(RtpTransceiverDirection::kInactive, RtpTransceiverDirection::kInactive, true))); TEST_F(SdpOfferAnswerTest, NegotiatesCcfbButNotTransportCc) { auto pc = CreatePeerConnection("WebRTC-RFC8888CongestionControlFeedback/Enabled/"); std::string sdp_offer = "v=0\r\n" "o=- 0 0 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=ice-ufrag:TESTUFRAG\r\n" "a=ice-pwd:ThisIsATestIcePasswordThatIsLongEnough\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=rtcp-fb:* ack ccfb\r\n" "a=rtcp-fb:111 transport-cc\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:1\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rtcp-fb:* ack ccfb\r\n" "a=rtcp-fb:96 transport-cc\r\n"; auto offer = CreateSessionDescription(SdpType::kOffer, sdp_offer); ASSERT_NE(offer, nullptr); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto answer = pc->CreateAnswerAndSetAsLocal(); ASSERT_NE(answer, nullptr); auto* desc = answer->description(); ASSERT_EQ(desc->contents().size(), 2u); for (const auto& content : desc->contents()) { auto* media_desc = content.media_description(); EXPECT_TRUE(media_desc->rtcp_fb_ack_ccfb()); for (const auto& codec : media_desc->codecs()) { EXPECT_FALSE( codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))); } } } TEST_F(SdpOfferAnswerTest, NegotiatesTransportCcWhenCcfbMissingInOneSection) { auto pc = CreatePeerConnection("WebRTC-RFC8888CongestionControlFeedback/Enabled/"); std::string sdp_offer = "v=0\r\n" "o=- 0 0 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=ice-ufrag:TESTUFRAG\r\n" "a=ice-pwd:ThisIsATestIcePasswordThatIsLongEnough\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:111 opus/48000/2\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:1\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rtcp-fb:* ack ccfb\r\n" "a=rtcp-fb:96 transport-cc\r\n"; auto offer = CreateSessionDescription(SdpType::kOffer, sdp_offer); ASSERT_NE(offer, nullptr); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto answer = pc->CreateAnswerAndSetAsLocal(); ASSERT_NE(answer, nullptr); auto* desc = answer->description(); ASSERT_EQ(desc->contents().size(), 2u); auto* audio_content = desc->GetContentByName("0"); ASSERT_TRUE(audio_content); auto* audio_desc = audio_content->media_description(); EXPECT_FALSE(audio_desc->rtcp_fb_ack_ccfb()); for (const auto& codec : audio_desc->codecs()) { EXPECT_FALSE( codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))); } auto* video_content = desc->GetContentByName("1"); ASSERT_TRUE(video_content); auto* video_desc = video_content->media_description(); EXPECT_FALSE(video_desc->rtcp_fb_ack_ccfb()); bool found_transport_cc = false; for (const auto& codec : video_desc->codecs()) { if (codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))) { found_transport_cc = true; break; } } EXPECT_TRUE(found_transport_cc); } TEST_F(SdpOfferAnswerTest, NegotiatesTransportCcWhenCcfbMissingInOneSectionReversed) { auto pc = CreatePeerConnection("WebRTC-RFC8888CongestionControlFeedback/Enabled/"); std::string sdp_offer = "v=0\r\n" "o=- 0 0 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=ice-ufrag:TESTUFRAG\r\n" "a=ice-pwd:ThisIsATestIcePasswordThatIsLongEnough\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=rtcp-fb:* ack ccfb\r\n" "a=rtcp-fb:111 transport-cc\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:1\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:96 VP8/90000\r\n"; auto offer = CreateSessionDescription(SdpType::kOffer, sdp_offer); ASSERT_NE(offer, nullptr); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto answer = pc->CreateAnswerAndSetAsLocal(); ASSERT_NE(answer, nullptr); auto* desc = answer->description(); ASSERT_EQ(desc->contents().size(), 2u); auto* audio_content = desc->GetContentByName("0"); ASSERT_TRUE(audio_content); auto* audio_desc = audio_content->media_description(); EXPECT_FALSE(audio_desc->rtcp_fb_ack_ccfb()); bool found_transport_cc = false; for (const auto& codec : audio_desc->codecs()) { if (codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))) { found_transport_cc = true; break; } } EXPECT_TRUE(found_transport_cc); auto* video_content = desc->GetContentByName("1"); ASSERT_TRUE(video_content); auto* video_desc = video_content->media_description(); EXPECT_FALSE(video_desc->rtcp_fb_ack_ccfb()); for (const auto& codec : video_desc->codecs()) { EXPECT_FALSE( codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))); } } TEST_F(SdpOfferAnswerTest, NegotiatesCcfbWhenPresentInBothSections) { auto pc = CreatePeerConnection("WebRTC-RFC8888CongestionControlFeedback/Enabled/"); std::string sdp_offer = "v=0\r\n" "o=- 0 0 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=ice-ufrag:TESTUFRAG\r\n" "a=ice-pwd:ThisIsATestIcePasswordThatIsLongEnough\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=rtcp-fb:* ack ccfb\r\n" "a=rtcp-fb:111 transport-cc\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:1\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rtcp-fb:* ack ccfb\r\n" "a=rtcp-fb:96 transport-cc\r\n"; auto offer = CreateSessionDescription(SdpType::kOffer, sdp_offer); ASSERT_NE(offer, nullptr); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto answer = pc->CreateAnswerAndSetAsLocal(); ASSERT_NE(answer, nullptr); auto* desc = answer->description(); ASSERT_EQ(desc->contents().size(), 2u); auto* audio_content = desc->GetContentByName("0"); ASSERT_TRUE(audio_content); auto* audio_desc = audio_content->media_description(); EXPECT_TRUE(audio_desc->rtcp_fb_ack_ccfb()); for (const auto& codec : audio_desc->codecs()) { EXPECT_FALSE( codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))); } auto* video_content = desc->GetContentByName("1"); ASSERT_TRUE(video_content); auto* video_desc = video_content->media_description(); EXPECT_TRUE(video_desc->rtcp_fb_ack_ccfb()); for (const auto& codec : video_desc->codecs()) { EXPECT_FALSE( codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))); } } TEST_F(SdpOfferAnswerTest, NegotiatesTransportCcWhenCcfbMissingInBothSections) { auto pc = CreatePeerConnection("WebRTC-RFC8888CongestionControlFeedback/Enabled/"); std::string sdp_offer = "v=0\r\n" "o=- 0 0 IN IP4 127.0.0.1\r\n" "s=-\r\n" "t=0 0\r\n" "a=group:BUNDLE 0 1\r\n" "a=ice-ufrag:TESTUFRAG\r\n" "a=ice-pwd:ThisIsATestIcePasswordThatIsLongEnough\r\n" "a=fingerprint:sha-256 " "AD:52:52:E0:B1:37:34:21:0E:15:8E:B7:56:56:7B:B4:39:0E:6D:1C:F5:84:A7:EE:" "B5:27:3E:30:B1:7D:69:42\r\n" "m=audio 9 UDP/TLS/RTP/SAVPF 111\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:0\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:111 opus/48000/2\r\n" "a=rtcp-fb:111 transport-cc\r\n" "m=video 9 UDP/TLS/RTP/SAVPF 96\r\n" "c=IN IP4 0.0.0.0\r\n" "a=mid:1\r\n" "a=sendrecv\r\n" "a=rtcp-mux\r\n" "a=rtpmap:96 VP8/90000\r\n" "a=rtcp-fb:96 transport-cc\r\n"; auto offer = CreateSessionDescription(SdpType::kOffer, sdp_offer); ASSERT_NE(offer, nullptr); EXPECT_TRUE(pc->SetRemoteDescription(std::move(offer))); auto answer = pc->CreateAnswerAndSetAsLocal(); ASSERT_NE(answer, nullptr); auto* desc = answer->description(); ASSERT_EQ(desc->contents().size(), 2u); auto* audio_content = desc->GetContentByName("0"); ASSERT_TRUE(audio_content); auto* audio_desc = audio_content->media_description(); EXPECT_FALSE(audio_desc->rtcp_fb_ack_ccfb()); bool found_transport_cc = false; for (const auto& codec : audio_desc->codecs()) { if (codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))) { found_transport_cc = true; break; } } EXPECT_TRUE(found_transport_cc); auto* video_content = desc->GetContentByName("1"); ASSERT_TRUE(video_content); auto* video_desc = video_content->media_description(); EXPECT_FALSE(video_desc->rtcp_fb_ack_ccfb()); found_transport_cc = false; for (const auto& codec : video_desc->codecs()) { if (codec.feedback_params.Has(FeedbackParam(kRtcpFbParamTransportCc))) { found_transport_cc = true; break; } } EXPECT_TRUE(found_transport_cc); } TEST_F(SdpOfferAnswerTest, StopsTransceiverWhenAnswerLacksSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), transceiver); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer->description()->contents(), SizeIs(1)); EXPECT_TRUE(answer->description() ->contents()[0] .media_description() ->sframe_enabled()); // Simulate a remote peer that strips sframe from the answer. answer->description()->contents()[0].media_description()->set_sframe_enabled( false); // SetRemoteDescription should succeed, but the transceiver should be stopped. EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_TRUE(transceiver->stopped()); } TEST_F(SdpOfferAnswerTest, AcceptsAnswerWithSframeWhenOfferedWithSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), transceiver); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer->description()->contents(), SizeIs(1)); EXPECT_TRUE(answer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_FALSE(transceiver->stopped()); } TEST_F(SdpOfferAnswerTest, AcceptsAnswerWithoutSframeWhenOfferedWithoutSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); caller->AddTransceiver(MediaType::AUDIO); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_FALSE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer->description()->contents(), SizeIs(1)); EXPECT_FALSE(answer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); } TEST_F(SdpOfferAnswerTest, SetLocalOfferSyncsTransceiverSframeFromNulloptToFalse) { auto caller = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EXPECT_EQ(transceiver->SframeEnabled(), std::nullopt); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_FALSE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_THAT(transceiver->SframeEnabled(), Optional(false)); } TEST_F(SdpOfferAnswerTest, SetLocalOfferPreservesSframeTrueOnTransceiver) { auto caller = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), transceiver); EXPECT_THAT(transceiver->SframeEnabled(), Optional(true)); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_THAT(transceiver->SframeEnabled(), Optional(true)); } TEST_F(SdpOfferAnswerTest, RemoteOfferWithoutSframeCreatesTransceiverWithSframeFalse) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); caller->AddTransceiver(MediaType::AUDIO); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_FALSE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); // Callee's transceiver was created by the remote offer. Since the offer // did not contain the sframe attribute, SframeEnabled should be false. auto callee_transceivers = callee->pc()->GetTransceivers(); ASSERT_THAT(callee_transceivers, SizeIs(1)); EXPECT_THAT(callee_transceivers[0]->SframeEnabled(), Optional(false)); } TEST_F(SdpOfferAnswerTest, RemoteOfferWithSframeCreatesTransceiverWithSframeTrue) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), transceiver); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); // Callee's transceiver was created by the remote offer. Since the offer // contained the sframe attribute, SframeEnabled should be true. auto callee_transceivers = callee->pc()->GetTransceivers(); ASSERT_THAT(callee_transceivers, SizeIs(1)); EXPECT_THAT(callee_transceivers[0]->SframeEnabled(), Optional(true)); } // Verify that enabling SFrame before first negotiation produces // an offer with a=sframe, and that the SFrame state is reflected // in the local description after SetLocalDescription. TEST_F(SdpOfferAnswerTest, EnableSframeBeforeNegotiationProducesOfferWithSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EXPECT_EQ(transceiver->SframeEnabled(), std::nullopt); EnableSframeOnTransceiver(signaling_thread_.get(), transceiver); EXPECT_THAT(transceiver->SframeEnabled(), Optional(true)); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); } // Verify that after a full negotiation with SFrame enabled, the state // is consistent on the caller side. TEST_F(SdpOfferAnswerTest, SframeTrueConsistentAfterFullNegotiation) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), transceiver); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_THAT(transceiver->SframeEnabled(), Optional(true)); } TEST_F(SdpOfferAnswerTest, RejectsAnswerWithSframeWhenOfferDidNotIncludeSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); caller->AddTransceiver(MediaType::AUDIO); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_FALSE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer->description()->contents(), SizeIs(1)); EXPECT_FALSE(answer->description() ->contents()[0] .media_description() ->sframe_enabled()); // Simulate a malicious/buggy answerer adding a=sframe to the answer. answer->description()->contents()[0].media_description()->set_sframe_enabled( true); RTCError error; EXPECT_FALSE(caller->SetRemoteDescription(std::move(answer), &error)); EXPECT_EQ(error.type(), RTCErrorType::INVALID_PARAMETER); EXPECT_THAT(error.message(), ::testing::HasSubstr("offer did not include a=sframe")); } // Verify that a rejected m-section with spurious a=sframe in // the answer is tolerated (rejected sections are skipped). TEST_F(SdpOfferAnswerTest, ToleratesRejectedAnswerSectionWithSpuriousSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); caller->AddTransceiver(MediaType::AUDIO); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); // Mark the section as rejected (port 0) AND add spurious a=sframe. answer->description()->contents()[0].rejected = true; answer->description()->contents()[0].media_description()->set_sframe_enabled( true); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); } // Sframe state is locked to false after negotiation without Sframe. TEST_F(SdpOfferAnswerTest, SframeLockedToFalseAfterNegotiationWithoutSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto transceiver = caller->AddTransceiver(MediaType::AUDIO); EXPECT_EQ(transceiver->SframeEnabled(), std::nullopt); auto offer = caller->CreateOfferAndSetAsLocal(); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_THAT(transceiver->SframeEnabled(), Optional(false)); } // Full end-to-end: Both sides enable Sframe, complete negotiation, verify // Sframe is active on both transceivers. TEST_F(SdpOfferAnswerTest, BothSidesEnableSframeFullNegotiation) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto caller_transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), caller_transceiver); // Callee adds a track via addTrack (so it's matched per JSEP §5.10) // and also explicitly enables Sframe. callee->AddAudioTrack("audio", {}); auto callee_transceivers = callee->pc()->GetTransceivers(); ASSERT_THAT(callee_transceivers, SizeIs(1)); EnableSframeOnTransceiver(signaling_thread_.get(), callee_transceivers[0]); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer->description()->contents(), SizeIs(1)); EXPECT_TRUE(answer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_THAT(caller_transceiver->SframeEnabled(), Optional(true)); EXPECT_FALSE(caller_transceiver->stopped()); callee_transceivers = callee->pc()->GetTransceivers(); ASSERT_THAT(callee_transceivers, SizeIs(1)); EXPECT_THAT(callee_transceivers[0]->SframeEnabled(), Optional(true)); EXPECT_FALSE(callee_transceivers[0]->stopped()); } // Callee has a transceiver created via addTrack (without Sframe). // Caller offers with a=sframe. The offer should be accepted (standard O/A // model), the answer should lack a=sframe, and the caller should stop the // transceiver via downgrade protection. TEST_F(SdpOfferAnswerTest, AddTrackTransceiverWithoutSframeAcceptsOfferWithSframe) { auto caller = CreatePeerConnection(); auto callee = CreatePeerConnection(); auto caller_transceiver = caller->AddTransceiver(MediaType::AUDIO); EnableSframeOnTransceiver(signaling_thread_.get(), caller_transceiver); // Callee uses addTrack (creates a transceiver via FindAvailableToReceive // path) but does NOT enable Sframe. callee->AddAudioTrack("audio", {}); auto callee_transceivers = callee->pc()->GetTransceivers(); ASSERT_THAT(callee_transceivers, SizeIs(1)); EXPECT_EQ(callee_transceivers[0]->SframeEnabled(), std::nullopt); auto offer = caller->CreateOfferAndSetAsLocal(); ASSERT_THAT(offer->description()->contents(), SizeIs(1)); EXPECT_TRUE(offer->description() ->contents()[0] .media_description() ->sframe_enabled()); EXPECT_TRUE(callee->SetRemoteDescription(std::move(offer))); callee_transceivers = callee->pc()->GetTransceivers(); ASSERT_THAT(callee_transceivers, SizeIs(1)); auto answer = callee->CreateAnswerAndSetAsLocal(); ASSERT_THAT(answer->description()->contents(), SizeIs(1)); EXPECT_FALSE(answer->description() ->contents()[0] .media_description() ->sframe_enabled()); // Caller receives answer without a=sframe → downgrade protection kicks in. EXPECT_TRUE(caller->SetRemoteDescription(std::move(answer))); EXPECT_TRUE(caller_transceiver->stopped()); } } // namespace webrtc
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2026-08-25