Movable support for VideoReceiveStream::Config and avoid copies

webrtc/video/rtp_stream_receiver.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 42 matching lines @@
                           public VCMFrameTypeCallback,
                           public VCMPacketRequestCallback {
  public:
   RtpStreamReceiver(vcm::VideoReceiver* video_receiver,
                     RemoteBitrateEstimator* remote_bitrate_estimator,
                     Transport* transport,
                     RtcpRttStats* rtt_stats,
                     PacedSender* paced_sender,
                     PacketRouter* packet_router,
                     VieRemb* remb,
-                    const VideoReceiveStream::Config& config,
+                    const VideoReceiveStream::Config* config,
                     ReceiveStatisticsProxy* receive_stats_proxy,
                     ProcessThread* process_thread);
   ~RtpStreamReceiver();
 
   bool SetReceiveCodec(const VideoCodec& video_codec);
 
   uint32_t GetRemoteSsrc() const;
   int GetCsrcs(uint32_t* csrcs) const;
 
   RtpReceiver* GetRtpReceiver() const;
@@ skipping 47 matching lines @@
   bool ParseAndHandleEncapsulatingHeader(const uint8_t* packet,
                                          size_t packet_length,
                                          const RTPHeader& header);
   void NotifyReceiverOfFecPacket(const RTPHeader& header);
   bool IsPacketInOrder(const RTPHeader& header) const;
   bool IsPacketRetransmitted(const RTPHeader& header, bool in_order) const;
   void UpdateHistograms();
   void EnableReceiveRtpHeaderExtension(const std::string& extension, int id);
 
   Clock* const clock_;
-  const VideoReceiveStream::Config config_;
+  // Ownership of this object lies with VideoReceiveStream, which owns |this|.
+  const VideoReceiveStream::Config& config_;
   vcm::VideoReceiver* const video_receiver_;
   RemoteBitrateEstimator* const remote_bitrate_estimator_;
   PacketRouter* const packet_router_;
   VieRemb* const remb_;
   ProcessThread* const process_thread_;
 
   RemoteNtpTimeEstimator ntp_estimator_;
   RTPPayloadRegistry rtp_payload_registry_;
 
   const std::unique_ptr<RtpHeaderParser> rtp_header_parser_;
   const std::unique_ptr<RtpReceiver> rtp_receiver_;
   const std::unique_ptr<ReceiveStatistics> rtp_receive_statistics_;
   std::unique_ptr<FecReceiver> fec_receiver_;
 
   rtc::CriticalSection receive_cs_;
   bool receiving_ GUARDED_BY(receive_cs_);
   uint8_t restored_packet_[IP_PACKET_SIZE] GUARDED_BY(receive_cs_);
   bool restored_packet_in_use_ GUARDED_BY(receive_cs_);
   int64_t last_packet_log_ms_ GUARDED_BY(receive_cs_);
 
   const std::unique_ptr<RtpRtcp> rtp_rtcp_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_RTP_STREAM_RECEIVER_H_