cast: cleanup rtp header and parsing

media/cast/net/rtp/rtp_packet_builder.cc

 // Copyright 2014 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/net/rtp/rtp_packet_builder.h"
 
 #include "base/big_endian.h"
 #include "base/logging.h"
 
 namespace media {
 namespace cast {
 
-const uint32 kCastRtpHeaderLength = 7;
-const uint32 kGenericRtpHeaderLength = 12;
-static const uint8 kRtpMarkerBitMask = 0x80;
-
 RtpPacketBuilder::RtpPacketBuilder()
     : is_key_(false),
       frame_id_(0),
       packet_id_(0),
       max_packet_id_(0),
       reference_frame_id_(0),
       timestamp_(0),
       sequence_number_(0),
       marker_(false),
       payload_type_(0),
@@ skipping 58 matching lines @@
   base::BigEndianWriter big_endian_writer(reinterpret_cast<char*>(data), 96);
   big_endian_writer.WriteU8(0x80);
   big_endian_writer.WriteU8(payload_type_ | (marker_ ? kRtpMarkerBitMask : 0));
   big_endian_writer.WriteU16(sequence_number_);
   big_endian_writer.WriteU32(timestamp_);
   big_endian_writer.WriteU32(ssrc_);
 }
 
 }  // namespace cast
 }  // namespace media