This CL adds methods to manipulate RTP header extension, particularly

content/browser/renderer_host/p2p/socket_host.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_
 
 #include "content/common/content_export.h"
 #include "content/public/common/p2p_socket_type.h"
 #include "net/base/ip_endpoint.h"
@@ skipping 35 matching lines @@
                     const std::vector<char>& data,
                     const talk_base::PacketOptions& options,
                     uint64 packet_id) = 0;
 
   virtual P2PSocketHost* AcceptIncomingTcpConnection(
       const net::IPEndPoint& remote_address, int id) = 0;
 
   virtual bool SetOption(P2PSocketOption option, int value) = 0;
 
  protected:
+  void MaybeUpdateRtpSendTimeExtn(char* data, int length,
+                                  const talk_base::PacketOptions& options);
+
   friend class P2PSocketHostTcpTestBase;
 
   // TODO(mallinath) - Remove this below enum and use one defined in
   // libjingle/souce/talk/p2p/base/stun.h
   enum StunMessageType {
     STUN_BINDING_REQUEST = 0x0001,
     STUN_BINDING_RESPONSE = 0x0101,
     STUN_BINDING_ERROR_RESPONSE = 0x0111,
     STUN_SHARED_SECRET_REQUEST = 0x0002,
     STUN_SHARED_SECRET_RESPONSE = 0x0102,
@@ skipping 24 matching lines @@
   };
 
   P2PSocketHost(IPC::Sender* message_sender, int id);
 
   // Verifies that the packet |data| has a valid STUN header. In case
   // of success stores type of the message in |type|.
   static bool GetStunPacketType(const char* data, int data_size,
                                 StunMessageType* type);
   static bool IsRequestOrResponse(StunMessageType type);
 
+  bool UpdateRtpAbsSendTimeExtension(char* data, int length,

[juberti2, 2014/02/22 01:16:05]

This should probably also be a Maybe function. 

Perhaps call the first function MaybeUpdatePacketSendTimeExtn, the second
MaybeUpdateRtpSendTimeExtn, and the last UpdateSendTimeExtnValue.

The last function should be MaybeUpdateRtpAuthTag

[Mallinath (Gone from Chromium), 2014/02/25 00:20:02]

Done.

+                                     const int extension_id);

[juberti2, 2014/02/22 01:16:05]

const not needed on value types

[Mallinath (Gone from Chromium), 2014/02/25 00:20:02]

Done.

+  bool GetRtpPacketStartPosition(char* data, int length, int* rtp_start_pos);
+  void UpdateAbsSendtime(char* data, int len);
+
+  void UpdateHmac(char* packet, int len,
+                  const talk_base::PacketOptions& options);
+
   IPC::Sender* message_sender_;
   int id_;
   State state_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PSocketHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_