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..fd0432fa645ef999ef7ccd8db54e9d4ddc8d84e1 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_; }
 
+  void set_media_connection_addr(
+      const rtc::Optional<rtc::SocketAddress>& addr) {
+    media_connection_addr_ = addr;
+  }
+  rtc::Optional<rtc::SocketAddress> media_connection_addr() {

[Taylor Brandstetter, 2017/03/10 22:41:17]

This doesn't need to be an Optional since a value should always exist. But even
if no value is set, this can be detected using SocketAddress::IsNil.

[Zhi Huang, 2017/03/15 04:04:59]

Done.

+    return media_connection_addr_;
+  }
+
  protected:
   bool rtcp_mux_ = false;
   bool rtcp_reduced_size_ = false;
@@ -324,6 +332,10 @@ class MediaContentDescription : public ContentDescription {
   bool partial_ = false;
   int buffered_mode_latency_ = kBufferedModeDisabled;
   MediaContentDirection direction_ = MD_SENDRECV;
+  // https://tools.ietf.org/html/rfc4566#page-21

[Taylor Brandstetter, 2017/03/10 22:41:17]

nit: Can link directly to the relevant section:
https://tools.ietf.org/html/rfc4566#section-5.7

[Zhi Huang, 2017/03/15 04:04:59]

Done.

+  // Media level connection address. If this is specified, it will overwrite the
+  // session level address.
+  rtc::Optional<rtc::SocketAddress> media_connection_addr_;
 };
 
 template <class C>