Only generate one CNAME per PeerConnection.

webrtc/pc/mediasession_unittest.cc

 /*
  *  Copyright 2004 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.
  */
 
@@ skipping 1298 matching lines @@
   EXPECT_EQ(audio_streams[0], updated_audio_streams[0]);
   EXPECT_EQ(kAudioTrack3, updated_audio_streams[1].id);  // New audio track.
   ASSERT_EQ(1U, updated_audio_streams[1].ssrcs.size());
   EXPECT_NE(0U, updated_audio_streams[1].ssrcs[0]);
   EXPECT_EQ(updated_audio_streams[0].cname, updated_audio_streams[1].cname);
 
   const StreamParamsVec& updated_video_streams = updated_vcd->streams();
   ASSERT_EQ(2U, updated_video_streams.size());
   EXPECT_EQ(video_streams[0], updated_video_streams[0]);
   EXPECT_EQ(kVideoTrack2, updated_video_streams[1].id);
-  EXPECT_NE(updated_video_streams[1].cname, updated_video_streams[0].cname);
+  // All the media streams in one PeerConnection share one cname
+  EXPECT_EQ(updated_video_streams[1].cname, updated_video_streams[0].cname);
 
   const StreamParamsVec& updated_data_streams = updated_dcd->streams();
   ASSERT_EQ(2U, updated_data_streams.size());
   EXPECT_EQ(data_streams[0], updated_data_streams[0]);
   EXPECT_EQ(kDataTrack3, updated_data_streams[1].id);  // New data track.
   ASSERT_EQ(1U, updated_data_streams[1].ssrcs.size());
   EXPECT_NE(0U, updated_data_streams[1].ssrcs[0]);
   EXPECT_EQ(updated_data_streams[0].cname, updated_data_streams[1].cname);
 }
 
@@ skipping 98 matching lines @@
   EXPECT_NE(0U, data_streams[0].ssrcs[0]);
   EXPECT_EQ(kDataTrack2, data_streams[1].id);
   ASSERT_EQ(1U, data_streams[1].ssrcs.size());
   EXPECT_NE(0U, data_streams[1].ssrcs[0]);
 
   EXPECT_EQ(cricket::kDataMaxBandwidth,
             dcd->bandwidth());                  // default bandwidth (auto)
   EXPECT_TRUE(dcd->rtcp_mux());                 // rtcp-mux defaults on
 
   // Update the answer. Add a new video track that is not synched to the
-  // other traacks and remove 1 audio track.
+  // other tracks and remove 1 audio track.
   opts.AddSendStream(MEDIA_TYPE_VIDEO, kVideoTrack2, kMediaStream2);
   opts.RemoveSendStream(MEDIA_TYPE_AUDIO, kAudioTrack2);
   opts.RemoveSendStream(MEDIA_TYPE_DATA, kDataTrack2);
   std::unique_ptr<SessionDescription> updated_answer(
       f2_.CreateAnswer(offer.get(), opts, answer.get()));
 
   ASSERT_TRUE(updated_answer.get() != NULL);
   ac = updated_answer->GetContentByName("audio");
   vc = updated_answer->GetContentByName("video");
   dc = updated_answer->GetContentByName("data");
@@ skipping 22 matching lines @@
   EXPECT_EQ(dcd->codecs(), updated_dcd->codecs());
 
   const StreamParamsVec& updated_audio_streams = updated_acd->streams();
   ASSERT_EQ(1U, updated_audio_streams.size());
   EXPECT_TRUE(audio_streams[0] ==  updated_audio_streams[0]);
 
   const StreamParamsVec& updated_video_streams = updated_vcd->streams();
   ASSERT_EQ(2U, updated_video_streams.size());
   EXPECT_EQ(video_streams[0], updated_video_streams[0]);
   EXPECT_EQ(kVideoTrack2, updated_video_streams[1].id);
-  EXPECT_NE(updated_video_streams[1].cname, updated_video_streams[0].cname);
+  // All media streams in one PeerConnection share one cname
+  EXPECT_EQ(updated_video_streams[1].cname, updated_video_streams[0].cname);
 
   const StreamParamsVec& updated_data_streams = updated_dcd->streams();
   ASSERT_EQ(1U, updated_data_streams.size());
   EXPECT_TRUE(data_streams[0] == updated_data_streams[0]);
 }
 
 
 // Create an updated offer after creating an answer to the original offer and
 // verify that the codecs that were part of the original answer are not changed
 // in the updated offer.
@@ skipping 892 matching lines @@
   const ContentInfo* audio_content = GetFirstAudioContent(updated_offer.get());
   const ContentInfo* video_content = GetFirstVideoContent(updated_offer.get());
   const ContentInfo* data_content = GetFirstDataContent(updated_offer.get());
   ASSERT_TRUE(audio_content != nullptr);
   ASSERT_TRUE(video_content != nullptr);
   ASSERT_TRUE(data_content != nullptr);
   EXPECT_EQ("audio_modified", audio_content->name);
   EXPECT_EQ("video_modified", video_content->name);
   EXPECT_EQ("data_modified", data_content->name);
 }