Cast:Adding cast_transport_config and cleaning up

media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.cc

 // Copyright 2013 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.
 
 #include "media/cast/transport/rtp_sender/rtp_packetizer/rtp_packetizer.h"
 
 #include "base/logging.h"
 #include "media/cast/transport/pacing/paced_sender.h"
 #include "net/base/big_endian.h"
 
 namespace media {
 namespace cast {
 namespace transport {
 
 static const uint16 kCommonRtpHeaderLength = 12;
 static const uint16 kCastRtpHeaderLength = 7;
 static const uint8 kCastKeyFrameBitMask = 0x80;
 static const uint8 kCastReferenceFrameIdBitMask = 0x40;
 static const uint8 kRtpMarkerBitMask = 0x80;
 
 
 RtpPacketizerConfig::RtpPacketizerConfig()
     : audio(false),
       payload_type(-1),
-      max_payload_length(kIpPacketSize - 28),  // Default is IP-v4/UDP.
+      max_payload_length(kMaxIpPacketSize - 28),  // Default is IP-v4/UDP.
       sequence_number(0),
       rtp_timestamp(0),
       frequency(8000),
       ssrc(0),
       channels(0) {}
 
 RtpPacketizerConfig::~RtpPacketizerConfig() {}
 
 RtpPacketizer::RtpPacketizer(PacedPacketSender* transport,
                              PacketStorage* packet_storage,
@@ skipping 123 matching lines @@
   net::BigEndianWriter big_endian_writer(&((*packet)[start_size]), 10);
   big_endian_writer.WriteU16(sequence_number_);
   big_endian_writer.WriteU32(time_stamp);
   big_endian_writer.WriteU32(config_.ssrc);
   ++sequence_number_;
 }
 
 }  // namespace transport
 }  // namespace cast
 }  // namespace media