Cast: Re-factor rtcp_sender.cc into rtcp_builder.cc and do some cleanup

media/cast/net/rtcp/rtcp_sender.h

-// 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.
-
-#ifndef MEDIA_CAST_NET_RTCP_RTCP_SENDER_H_
-#define MEDIA_CAST_NET_RTCP_RTCP_SENDER_H_
-
-#include <deque>
-#include <list>
-#include <string>
-
-#include "media/cast/cast_config.h"
-#include "media/cast/cast_defines.h"
-#include "media/cast/net/cast_transport_defines.h"
-#include "media/cast/net/rtcp/receiver_rtcp_event_subscriber.h"
-#include "media/cast/net/rtcp/rtcp_defines.h"
-
-namespace media {
-namespace cast {
-
-// We limit the size of receiver logs to avoid queuing up packets.
-const size_t kMaxReceiverLogBytes = 200;
-
-// The determines how long to hold receiver log events, based on how
-// many "receiver log message reports" ago the events were sent.
-const size_t kReceiveLogMessageHistorySize = 20;
-
-// This determines when to send events the second time.
-const size_t kFirstRedundancyOffset = 10;
-COMPILE_ASSERT(kFirstRedundancyOffset > 0 &&
-                   kFirstRedundancyOffset <= kReceiveLogMessageHistorySize,
-               redundancy_offset_out_of_range);
-
-// When to send events the third time.
-const size_t kSecondRedundancyOffset = 20;
-COMPILE_ASSERT(kSecondRedundancyOffset >
-                   kFirstRedundancyOffset && kSecondRedundancyOffset <=
-                   kReceiveLogMessageHistorySize,
-               redundancy_offset_out_of_range);
-
-class PacedPacketSender;
-
-// TODO(hclam): This should be renamed to RtcpPacketBuilder. The function
-// of this class is to only to build a RTCP packet but not to send it.
-class RtcpSender {
- public:
-  RtcpSender(PacedPacketSender* outgoing_transport,
-             uint32 sending_ssrc);
-  ~RtcpSender();
-
-  // TODO(hclam): This method should be to build a packet instead of
-  // sending it.
-  void SendRtcpFromRtpReceiver(
-      const RtcpReportBlock* report_block,
-      const RtcpReceiverReferenceTimeReport* rrtr,
-      const RtcpCastMessage* cast_message,
-      const ReceiverRtcpEventSubscriber::RtcpEventMultiMap* rtcp_events,
-      base::TimeDelta target_delay);
-
-  // TODO(hclam): This method should be to build a packet instead of
-  // sending it.
-  void SendRtcpFromRtpSender(const RtcpSenderInfo& sender_info);
-
- private:
-  void BuildRR(const RtcpReportBlock* report_block,
-               Packet* packet) const;
-
-  void AddReportBlocks(const RtcpReportBlock& report_block,
-                       Packet* packet) const;
-
-  void BuildRrtr(const RtcpReceiverReferenceTimeReport* rrtr,
-                 Packet* packet) const;
-
-  void BuildCast(const RtcpCastMessage* cast_message,
-                 base::TimeDelta target_delay,
-                 Packet* packet) const;
-
-  void BuildSR(const RtcpSenderInfo& sender_info, Packet* packet) const;
-
-  void BuildDlrrRb(const RtcpDlrrReportBlock& dlrr, Packet* packet) const;
-
-  void BuildReceiverLog(
-      const ReceiverRtcpEventSubscriber::RtcpEventMultiMap& rtcp_events,
-      Packet* packet);
-
-  bool BuildRtcpReceiverLogMessage(
-      const ReceiverRtcpEventSubscriber::RtcpEventMultiMap& rtcp_events,
-      size_t start_size,
-      RtcpReceiverLogMessage* receiver_log_message,
-      size_t* number_of_frames,
-      size_t* total_number_of_messages_to_send,
-      size_t* rtcp_log_size);
-
-  const uint32 ssrc_;
-
- // Not owned by this class.
-  PacedPacketSender* const transport_;
-
-  std::deque<RtcpReceiverLogMessage> rtcp_events_history_;
-
-  DISALLOW_COPY_AND_ASSIGN(RtcpSender);
-};
-
-}  // namespace cast
-}  // namespace media
-
-#endif  // MEDIA_CAST_NET_RTCP_RTCP_SENDER_H_