Make OverheadObserver::OnOverheadChanged count RTP headers only

webrtc/modules/rtp_rtcp/include/rtp_rtcp.h

 /*
  *  Copyright (c) 2012 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 96 matching lines @@
 
   virtual int32_t IncomingRtcpPacket(const uint8_t* incoming_packet,
                                      size_t incoming_packet_length) = 0;
 
   virtual void SetRemoteSSRC(uint32_t ssrc) = 0;
 
   // **************************************************************************
   // Sender
   // **************************************************************************
 
-  // Sets MTU.
-  // |size| - Max transfer unit in bytes, default is 1500.
-  // Returns -1 on failure else 0.
-  virtual int32_t SetMaxTransferUnit(uint16_t size) = 0;
+  // TODO(nisse): Deprecated. Kept temporarily, as an alias for the
+  // new function which has slighly different semantics. Delete as
+  // soon as known applications are updated.
+  virtual int32_t SetMaxTransferUnit(uint16_t size) {
+    SetMaxRtpPacketSize(size);
+    return 0;
+  }
 
-  // Sets transport overhead. Default is IPv4 and UDP with no encryption.
-  // |tcp| - true for TCP false UDP.
-  // |ipv6| - true for IP version 6 false for version 4.
-  // |authentication_overhead| - number of bytes to leave for an authentication
-  // header.
-  // Returns -1 on failure else 0
-  // TODO(michaelt): deprecate the function.
-  virtual int32_t SetTransportOverhead(bool tcp,
-                                       bool ipv6,
-                                       uint8_t authentication_overhead = 0) = 0;
+  // Sets the maximum size of an RTP packet, including RTP headers.
+  virtual void SetMaxRtpPacketSize(size_t size) = 0;
 
-  // Sets transport overhead per packet.
-  virtual void SetTransportOverhead(int transport_overhead_per_packet) = 0;
-
-  // Returns max payload length, which is a combination of the configuration
-  // MaxTransferUnit and TransportOverhead.
+  // Returns max payload length.
   // Does not account for RTP headers and FEC/ULP/RED overhead (when FEC is
   // enabled).
-  virtual uint16_t MaxPayloadLength() const = 0;
+  virtual size_t MaxPayloadSize() const = 0;
 
-  // Returns max data payload length, which is a combination of the
-  // configuration MaxTransferUnit, headers and TransportOverhead.
-  // Takes into account RTP headers and FEC/ULP/RED overhead (when FEC is
-  // enabled).
-  virtual uint16_t MaxDataPayloadLength() const = 0;
+  // Returns max RTP packet size. Takes into account RTP headers and
+  // FEC/ULP/RED overhead (when FEC is enabled).
+  virtual size_t MaxRtpPacketSize() const = 0;
 
   // Sets codec name and payload type. Returns -1 on failure else 0.
   virtual int32_t RegisterSendPayload(const CodecInst& voice_codec) = 0;
 
   // Sets codec name and payload type. Return -1 on failure else 0.
   virtual int32_t RegisterSendPayload(const VideoCodec& video_codec) = 0;
 
   virtual void RegisterVideoSendPayload(int payload_type,
                                         const char* payload_name) = 0;
 
@@ skipping 324 matching lines @@
   virtual int32_t SetKeyFrameRequestMethod(KeyFrameRequestMethod method) = 0;
 
   // Sends a request for a keyframe.
   // Returns -1 on failure else 0.
   virtual int32_t RequestKeyFrame() = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_RTCP_H_