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

webrtc/pc/mediasession.h

 /*
  *  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 291 matching lines @@
   bool conference_mode() const { return conference_mode_; }
 
   void set_partial(bool partial) { partial_ = partial; }
   bool partial() const { return partial_;  }
 
   void set_buffered_mode_latency(int latency) {
     buffered_mode_latency_ = latency;
   }
   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;
   int bandwidth_ = kAutoBandwidth;
   std::string protocol_;
   std::vector<CryptoParams> cryptos_;
   CryptoType crypto_required_ = CT_NONE;
   std::vector<webrtc::RtpExtension> rtp_header_extensions_;
   bool rtp_header_extensions_set_ = false;
   bool multistream_ = false;
   StreamParamsVec streams_;
   bool conference_mode_ = false;
   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>
 class MediaContentDescriptionImpl : public MediaContentDescription {
  public:
   typedef C CodecType;
 
   // Codecs should be in preference order (most preferred codec first).
   const std::vector<C>& codecs() const { return codecs_; }
   void set_codecs(const std::vector<C>& codecs) { codecs_ = codecs; }
@@ skipping 278 matching lines @@
 void GetSupportedVideoCryptoSuiteNames(const rtc::CryptoOptions& crypto_options,
     std::vector<std::string>* crypto_suite_names);
 void GetSupportedDataCryptoSuiteNames(const rtc::CryptoOptions& crypto_options,
     std::vector<std::string>* crypto_suite_names);
 void GetDefaultSrtpCryptoSuiteNames(const rtc::CryptoOptions& crypto_options,
     std::vector<std::string>* crypto_suite_names);
 
 }  // namespace cricket
 
 #endif  // WEBRTC_PC_MEDIASESSION_H_