Parse the connection data in SDP (c= line).

webrtc/pc/mediasession.h

Index: webrtc/pc/mediasession.h
diff --git a/webrtc/pc/mediasession.h b/webrtc/pc/mediasession.h
index a901e1d75a3e75c129f40d1b1c7694eea55ab8ae..5eba6f366f0a353f4f92a52270444b2907217c76 100644
--- a/webrtc/pc/mediasession.h
+++ b/webrtc/pc/mediasession.h
@@ -309,6 +309,14 @@ class MediaContentDescription : public ContentDescription {
   }
   int buffered_mode_latency() const { return buffered_mode_latency_; }
 
+  // https://tools.ietf.org/html/rfc4566#section-5.7
+  // Media level connection address. If this is specified in the SDP, it will
+  // overwrite the session level address.

[Taylor Brandstetter, 2017/03/15 17:57:20]

This comment could be updated. Something like "May be present at the media or
session level of SDP. If present at both levels, the media-level attribute
overwrites the session-level one."

[Zhi Huang, 2017/03/16 19:47:26]

Done.

+  void set_connection_addr(const rtc::SocketAddress& addr) {

[Taylor Brandstetter, 2017/03/15 17:57:20]

nit: I'd prefer spelling out "connection_address"

[Zhi Huang, 2017/03/16 19:47:26]

Done.

+    connection_addr_ = addr;
+  }
+  const rtc::SocketAddress& connection_addr() const { return connection_addr_; }
+
  protected:
   bool rtcp_mux_ = false;
   bool rtcp_reduced_size_ = false;
@@ -324,6 +332,7 @@ class MediaContentDescription : public ContentDescription {
   bool partial_ = false;
   int buffered_mode_latency_ = kBufferedModeDisabled;
   MediaContentDirection direction_ = MD_SENDRECV;
+  rtc::SocketAddress connection_addr_;
 };
 
 template <class C>