Cast:Moving netwrok sender related code to a designated folder

media/cast/pacing/paced_sender.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/pacing/paced_sender.h"
-
-#include "base/bind.h"
-#include "base/message_loop/message_loop.h"
-
-namespace media {
-namespace cast {
-
-static const int64 kPacingIntervalMs = 10;
-// Each frame will be split into no more than kPacingMaxBurstsPerFrame
-// bursts of packets.
-static const size_t kPacingMaxBurstsPerFrame = 3;
-
-PacedSender::PacedSender(scoped_refptr<CastEnvironment> cast_environment,
-                         PacketSender* transport)
-    : cast_environment_(cast_environment),
-      burst_size_(1),
-      packets_sent_in_burst_(0),
-      transport_(transport),
-      weak_factory_(this) {
-  ScheduleNextSend();
-}
-
-PacedSender::~PacedSender() {}
-
-bool PacedSender::SendPackets(const PacketList& packets) {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  cast_environment_->Logging()->InsertPacketListEvent(kPacketSentToPacer,
-                                                      packets);
-  return SendPacketsToTransport(packets, &packet_list_);
-}
-
-bool PacedSender::ResendPackets(const PacketList& packets) {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  cast_environment_->Logging()->InsertPacketListEvent(kPacketRetransmited,
-                                                      packets);
-  return SendPacketsToTransport(packets, &resend_packet_list_);
-}
-
-bool PacedSender::SendPacketsToTransport(const PacketList& packets,
-                                         PacketList* packets_not_sent) {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  UpdateBurstSize(packets.size());
-
-  if (!packets_not_sent->empty()) {
-    packets_not_sent->insert(packets_not_sent->end(),
-                             packets.begin(), packets.end());
-    return true;
-  }
-  PacketList packets_to_send;
-  PacketList::const_iterator first_to_store_it = packets.begin();
-
-  size_t max_packets_to_send_now = burst_size_ - packets_sent_in_burst_;
-  if (max_packets_to_send_now > 0) {
-    size_t packets_to_send_now = std::min(max_packets_to_send_now,
-                                          packets.size());
-
-    std::advance(first_to_store_it, packets_to_send_now);
-    packets_to_send.insert(packets_to_send.begin(),
-                           packets.begin(), first_to_store_it);
-  }
-  packets_not_sent->insert(packets_not_sent->end(),
-                         first_to_store_it, packets.end());
-  packets_sent_in_burst_ += packets_to_send.size();
-  if (packets_to_send.empty()) return true;
-
-  cast_environment_->Logging()->InsertPacketListEvent(kPacketSentToNetwork,
-                                                      packets);
-  return transport_->SendPackets(packets_to_send);
-}
-
-bool PacedSender::SendRtcpPacket(const Packet& packet) {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  // We pass the RTCP packets straight through.
-  return transport_->SendPacket(packet);
-}
-
-void PacedSender::ScheduleNextSend() {
-  base::TimeDelta time_to_next = time_last_process_ -
-      cast_environment_->Clock()->NowTicks() +
-      base::TimeDelta::FromMilliseconds(kPacingIntervalMs);
-
-  time_to_next = std::max(time_to_next, base::TimeDelta());
-
-  cast_environment_->PostDelayedTask(CastEnvironment::MAIN, FROM_HERE,
-      base::Bind(&PacedSender::SendNextPacketBurst, weak_factory_.GetWeakPtr()),
-                 time_to_next);
-}
-
-void PacedSender::SendNextPacketBurst() {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  SendStoredPackets();
-  time_last_process_ = cast_environment_->Clock()->NowTicks();
-  ScheduleNextSend();
-}
-
-void PacedSender::SendStoredPackets() {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  if (packet_list_.empty() && resend_packet_list_.empty()) return;
-
-  size_t packets_to_send = burst_size_;
-  PacketList packets_to_resend;
-
-  // Send our re-send packets first.
-  if (!resend_packet_list_.empty()) {
-    PacketList::iterator it = resend_packet_list_.begin();
-    size_t packets_to_send_now = std::min(packets_to_send,
-                                          resend_packet_list_.size());
-    std::advance(it, packets_to_send_now);
-    packets_to_resend.insert(packets_to_resend.begin(),
-                             resend_packet_list_.begin(), it);
-    resend_packet_list_.erase(resend_packet_list_.begin(), it);
-    packets_to_send -= packets_to_resend.size();
-  }
-  if (!packet_list_.empty() && packets_to_send > 0) {
-    PacketList::iterator it = packet_list_.begin();
-    size_t packets_to_send_now = std::min(packets_to_send,
-                                          packet_list_.size());
-
-    std::advance(it, packets_to_send_now);
-    packets_to_resend.insert(packets_to_resend.end(),
-                             packet_list_.begin(), it);
-    packet_list_.erase(packet_list_.begin(), it);
-
-    if (packet_list_.empty()) {
-      burst_size_ = 1;  // Reset burst size after we sent the last stored packet
-      packets_sent_in_burst_ = 0;
-    }
-  }
-  transport_->SendPackets(packets_to_resend);
-}
-
-void PacedSender::UpdateBurstSize(size_t packets_to_send) {
-  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
-  packets_to_send = std::max(packets_to_send,
-      resend_packet_list_.size() + packet_list_.size());
-
-  packets_to_send += (kPacingMaxBurstsPerFrame - 1);  // Round up.
-  burst_size_ = std::max(packets_to_send / kPacingMaxBurstsPerFrame,
-                         burst_size_);
-}
-
-}  // namespace cast
-}  // namespace media