[Cast] Limit frames in flight by duration, and not by number of frames.

media/cast/net/rtp/rtp_sender.cc

Index: media/cast/net/rtp/rtp_sender.cc
diff --git a/media/cast/net/rtp/rtp_sender.cc b/media/cast/net/rtp/rtp_sender.cc
index bf1200fd3305391025973bbf9da08de52dc3344d..c0a757571161f1884a26e775dba1ed4af79932d5 100644
--- a/media/cast/net/rtp/rtp_sender.cc
+++ b/media/cast/net/rtp/rtp_sender.cc
@@ -41,25 +41,22 @@ RtpSender::RtpSender(
 RtpSender::~RtpSender() {}
 
 bool RtpSender::Initialize(const CastTransportRtpConfig& config) {
-  storage_.reset(new PacketStorage(config.stored_frames));
-  if (!storage_->IsValid()) {
-    return false;
-  }
   config_.ssrc = config.ssrc;
   config_.payload_type = config.rtp_payload_type;
-  packetizer_.reset(new RtpPacketizer(transport_, storage_.get(), config_));
+  packetizer_.reset(new RtpPacketizer(transport_, &storage_, config_));
   return true;
 }
 
 void RtpSender::SendFrame(const EncodedFrame& frame) {
   DCHECK(packetizer_);
   packetizer_->SendFrameAsPackets(frame);
+  LOG_IF(DFATAL, storage_.GetNumberOfStoredFrames() > kMaxUnackedFrames)
+      << "Possible bug: Frames are not being actively released from storage.";
 }
 
 void RtpSender::ResendPackets(
     const MissingFramesAndPacketsMap& missing_frames_and_packets,
     bool cancel_rtx_if_not_in_list, const DedupInfo& dedup_info) {
-  DCHECK(storage_);
   // Iterate over all frames in the list.
   for (MissingFramesAndPacketsMap::const_iterator it =
            missing_frames_and_packets.begin();
@@ -76,7 +73,7 @@ void RtpSender::ResendPackets(
     bool resend_last = missing_packet_set.find(kRtcpCastLastPacket) !=
         missing_packet_set.end();
 
-    const SendPacketVector* stored_packets = storage_->GetFrame8(frame_id);
+    const SendPacketVector* stored_packets = storage_.GetFrame8(frame_id);
     if (!stored_packets)
       continue;
 
@@ -119,13 +116,14 @@ void RtpSender::ResendPackets(
 void RtpSender::CancelSendingFrames(const std::vector<uint32>& frame_ids) {
   for (std::vector<uint32>::const_iterator i = frame_ids.begin();
        i != frame_ids.end(); ++i) {
-    const SendPacketVector* stored_packets = storage_->GetFrame8(*i & 0xFF);
+    const SendPacketVector* stored_packets = storage_.GetFrame8(*i & 0xFF);
     if (!stored_packets)
       continue;
     for (SendPacketVector::const_iterator j = stored_packets->begin();
          j != stored_packets->end(); ++j) {
       transport_->CancelSendingPacket(j->first);
     }
+    storage_.ReleaseFrame(*i);
   }
 }
 
@@ -157,7 +155,7 @@ void RtpSender::UpdateSequenceNumber(Packet* packet) {
 }
 
 int64 RtpSender::GetLastByteSentForFrame(uint32 frame_id) {
-  const SendPacketVector* stored_packets = storage_->GetFrame8(frame_id & 0xFF);
+  const SendPacketVector* stored_packets = storage_.GetFrame8(frame_id & 0xFF);
   if (!stored_packets)
     return 0;
   PacketKey last_packet_key = stored_packets->rbegin()->first;