Cast: cancel re-sending if a later nack packet says the receiver doesn't want it anymore

media/cast/transport/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/transport/pacing/paced_sender.h"
 
 #include "base/big_endian.h"
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 
@@ skipping 86 matching lines @@
             packet,
             base::Bind(&PacedSender::SendStoredPackets,
                        weak_factory_.GetWeakPtr()))) {
       state_ = State_TransportBlocked;
     }
 
   }
   return true;
 }
 
+void PacedSender::CancelSendingPacket(const PacketKey& packet_key) {
+  packet_list_.erase(packet_key);
+}
+
 PacketRef PacedSender::GetNextPacket(PacketType* packet_type) {
   std::map<PacketKey, std::pair<PacketType, PacketRef> >::iterator i;
   i = packet_list_.begin();
   DCHECK(i != packet_list_.end());
   *packet_type = i->second.first;
   PacketRef ret = i->second.second;
   packet_list_.erase(i);
   return ret;
 }
 
@@ skipping 106 matching lines @@
   CastLoggingEvent event = retransmit ?
       PACKET_RETRANSMITTED : PACKET_SENT_TO_NETWORK;
   EventMediaType media_type = is_audio ? AUDIO_EVENT : VIDEO_EVENT;
   logging_->InsertSinglePacketEvent(clock_->NowTicks(), event, media_type,
       packet);
 }
 
 }  // namespace transport
 }  // namespace cast
 }  // namespace media