Filter overlapping RTP header extensions.

talk/media/webrtc/webrtcvideoengine2_unittest.cc

Index: talk/media/webrtc/webrtcvideoengine2_unittest.cc
diff --git a/talk/media/webrtc/webrtcvideoengine2_unittest.cc b/talk/media/webrtc/webrtcvideoengine2_unittest.cc
index 479dd05f553be4b060620f4d645fa420d738ae2f..83910dbbbdb61d0b96bcd04e9125dd041155203d 100644
--- a/talk/media/webrtc/webrtcvideoengine2_unittest.cc
+++ b/talk/media/webrtc/webrtcvideoengine2_unittest.cc
@@ -1199,6 +1199,28 @@ TEST_F(WebRtcVideoChannel2Test, RecvAbsoluteSendTimeHeaderExtensions) {
                                  webrtc::RtpExtension::kAbsSendTime);
 }
 
+TEST_F(WebRtcVideoChannel2Test, FiltersOverlappingExtensions) {
+  // Enable three overlapping extensions.
+  cricket::VideoSendParameters parameters = send_parameters_;
+  int id = 1;
+  parameters.extensions.push_back(
+      cricket::RtpHeaderExtension(kRtpAbsoluteSenderTimeHeaderExtension, id++));
+  parameters.extensions.push_back(
+      cricket::RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, id++));
+  parameters.extensions.push_back(cricket::RtpHeaderExtension(
+      kRtpTransportSequenceNumberHeaderExtension, id));
+  EXPECT_TRUE(channel_->SetSendParameters(parameters));
+  FakeVideoSendStream* send_stream =
+      AddSendStream(cricket::StreamParams::CreateLegacy(123));
+
+  // Verify that only one of them has been set, and that it is the one with
+  // highest priority (transport sequence number).
+  ASSERT_EQ(1u, send_stream->GetConfig().rtp.extensions.size());
+  EXPECT_EQ(id, send_stream->GetConfig().rtp.extensions[0].id);
+  EXPECT_EQ(webrtc::RtpExtension::kTransportSequenceNumber,
+            send_stream->GetConfig().rtp.extensions[0].name);
+}
+
 class WebRtcVideoChannel2WithSendSideBweTest : public WebRtcVideoChannel2Test {
  public:
   WebRtcVideoChannel2WithSendSideBweTest()
@@ -1230,14 +1252,11 @@ TEST_F(WebRtcVideoChannel2Test, RecvVideoRotationHeaderExtensions) {
 }
 
 TEST_F(WebRtcVideoChannel2Test, IdenticalSendExtensionsDoesntRecreateStream) {
-  const int kTOffsetId = 1;
-  const int kAbsSendTimeId = 2;
-  const int kVideoRotationId = 3;
+  const int kAbsSendTimeId = 1;
+  const int kVideoRotationId = 2;
   send_parameters_.extensions.push_back(cricket::RtpHeaderExtension(
       kRtpAbsoluteSenderTimeHeaderExtension, kAbsSendTimeId));
   send_parameters_.extensions.push_back(cricket::RtpHeaderExtension(
-      kRtpTimestampOffsetHeaderExtension, kTOffsetId));
-  send_parameters_.extensions.push_back(cricket::RtpHeaderExtension(
       kRtpVideoRotationHeaderExtension, kVideoRotationId));
 
   EXPECT_TRUE(channel_->SetSendParameters(send_parameters_));
@@ -1245,7 +1264,7 @@ TEST_F(WebRtcVideoChannel2Test, IdenticalSendExtensionsDoesntRecreateStream) {
       AddSendStream(cricket::StreamParams::CreateLegacy(123));
 
   EXPECT_EQ(1, fake_call_->GetNumCreatedSendStreams());
-  ASSERT_EQ(3u, send_stream->GetConfig().rtp.extensions.size());
+  ASSERT_EQ(2u, send_stream->GetConfig().rtp.extensions.size());
 
   // Setting the same extensions (even if in different order) shouldn't
   // reallocate the stream.