/*
 *  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.
 */

#ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_RECEIVER_H_
#define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_RECEIVER_H_

#include <map>
#include <vector>
#include <set>

#include "webrtc/base/thread_annotations.h"
#include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_receiver_help.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
#include "webrtc/modules/rtp_rtcp/source/tmmbr_help.h"
#include "webrtc/typedefs.h"

namespace webrtc {
class ModuleRtpRtcpImpl;

class RTCPReceiver : public TMMBRHelp
{
public:
 RTCPReceiver(Clock* clock,
              bool receiver_only,
              RtcpPacketTypeCounterObserver* packet_type_counter_observer,
              RtcpBandwidthObserver* rtcp_bandwidth_observer,
              RtcpIntraFrameObserver* rtcp_intra_frame_observer,
              TransportFeedbackObserver* transport_feedback_observer,
              ModuleRtpRtcpImpl* owner);
    virtual ~RTCPReceiver();

    RTCPMethod Status() const;
    void SetRTCPStatus(RTCPMethod method);

    int64_t LastReceived();
    int64_t LastReceivedReceiverReport() const;

    void SetSsrcs(uint32_t main_ssrc,
                  const std::set<uint32_t>& registered_ssrcs);
    void SetRelaySSRC(uint32_t ssrc);
    void SetRemoteSSRC(uint32_t ssrc);
    uint32_t RemoteSSRC() const;

    uint32_t RelaySSRC() const;

    int32_t IncomingRTCPPacket(
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation,
        RTCPUtility::RTCPParserV2 *rtcpParser);

    void TriggerCallbacksFromRTCPPacket(
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    // get received cname
    int32_t CNAME(uint32_t remoteSSRC, char cName[RTCP_CNAME_SIZE]) const;

    // get received NTP
    bool NTP(uint32_t* ReceivedNTPsecs,
             uint32_t* ReceivedNTPfrac,
             uint32_t* RTCPArrivalTimeSecs,
             uint32_t* RTCPArrivalTimeFrac,
             uint32_t* rtcp_timestamp) const;

   bool LastReceivedXrReferenceTimeInfo(RtcpReceiveTimeInfo* info) const;

    // get rtt
    int32_t RTT(uint32_t remoteSSRC,
                int64_t* RTT,
                int64_t* avgRTT,
                int64_t* minRTT,
                int64_t* maxRTT) const;

    int32_t SenderInfoReceived(RTCPSenderInfo* senderInfo) const;

    bool GetAndResetXrRrRtt(int64_t* rtt_ms);

    // get statistics
    int32_t StatisticsReceived(
        std::vector<RTCPReportBlock>* receiveBlocks) const;

    // Returns true if we haven't received an RTCP RR for several RTCP
    // intervals, but only triggers true once.
    bool RtcpRrTimeout(int64_t rtcp_interval_ms);

    // Returns true if we haven't received an RTCP RR telling the receive side
    // has not received RTP packets for too long, i.e. extended highest sequence
    // number hasn't increased for several RTCP intervals. The function only
    // returns true once until a new RR is received.
    bool RtcpRrSequenceNumberTimeout(int64_t rtcp_interval_ms);

    // Get TMMBR
    int32_t TMMBRReceived(uint32_t size,
                          uint32_t accNumCandidates,
                          TMMBRSet* candidateSet) const;

    bool UpdateRTCPReceiveInformationTimers();

    int32_t BoundingSet(bool &tmmbrOwner, TMMBRSet* boundingSetRec);

    int32_t UpdateTMMBR();

    void RegisterRtcpStatisticsCallback(RtcpStatisticsCallback* callback);
    RtcpStatisticsCallback* GetRtcpStatisticsCallback();

protected:
 RTCPUtility::RTCPCnameInformation* CreateCnameInformation(uint32_t remoteSSRC);
 RTCPUtility::RTCPCnameInformation* GetCnameInformation(
     uint32_t remoteSSRC) const;

 RTCPHelp::RTCPReceiveInformation* CreateReceiveInformation(
     uint32_t remoteSSRC);
 RTCPHelp::RTCPReceiveInformation* GetReceiveInformation(uint32_t remoteSSRC);

    void UpdateReceiveInformation(
        RTCPHelp::RTCPReceiveInformation& receiveInformation);

    void HandleSenderReceiverReport(
        RTCPUtility::RTCPParserV2& rtcpParser,
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleReportBlock(
        const RTCPUtility::RTCPPacket& rtcpPacket,
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation,
        uint32_t remoteSSRC);

    void HandleSDES(RTCPUtility::RTCPParserV2& rtcpParser,
                    RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleSDESChunk(RTCPUtility::RTCPParserV2& rtcpParser);

    void HandleXrHeader(RTCPUtility::RTCPParserV2& parser,
                        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleXrReceiveReferenceTime(
        RTCPUtility::RTCPParserV2& parser,
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleXrDlrrReportBlock(
        RTCPUtility::RTCPParserV2& parser,
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleXrDlrrReportBlockItem(
        const RTCPUtility::RTCPPacket& packet,
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleXRVOIPMetric(
        RTCPUtility::RTCPParserV2& rtcpParser,
        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleNACK(RTCPUtility::RTCPParserV2& rtcpParser,
                    RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleNACKItem(const RTCPUtility::RTCPPacket& rtcpPacket,
                        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleBYE(RTCPUtility::RTCPParserV2& rtcpParser);

    void HandlePLI(RTCPUtility::RTCPParserV2& rtcpParser,
                   RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleSLI(RTCPUtility::RTCPParserV2& rtcpParser,
                   RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleSLIItem(const RTCPUtility::RTCPPacket& rtcpPacket,
                       RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleRPSI(RTCPUtility::RTCPParserV2& rtcpParser,
                    RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandlePsfbApp(RTCPUtility::RTCPParserV2& rtcpParser,
                       RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleREMBItem(RTCPUtility::RTCPParserV2& rtcpParser,
                        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleIJ(RTCPUtility::RTCPParserV2& rtcpParser,
                  RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleIJItem(const RTCPUtility::RTCPPacket& rtcpPacket,
                      RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleTMMBR(RTCPUtility::RTCPParserV2& rtcpParser,
                     RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleTMMBRItem(RTCPHelp::RTCPReceiveInformation& receiveInfo,
                         const RTCPUtility::RTCPPacket& rtcpPacket,
                         RTCPHelp::RTCPPacketInformation& rtcpPacketInformation,
                         uint32_t senderSSRC);

    void HandleTMMBN(RTCPUtility::RTCPParserV2& rtcpParser,
                     RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleSR_REQ(RTCPUtility::RTCPParserV2& rtcpParser,
                      RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleTMMBNItem(RTCPHelp::RTCPReceiveInformation& receiveInfo,
                         const RTCPUtility::RTCPPacket& rtcpPacket);

    void HandleFIR(RTCPUtility::RTCPParserV2& rtcpParser,
                   RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleFIRItem(RTCPHelp::RTCPReceiveInformation* receiveInfo,
                       const RTCPUtility::RTCPPacket& rtcpPacket,
                       RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleAPP(RTCPUtility::RTCPParserV2& rtcpParser,
                   RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleAPPItem(RTCPUtility::RTCPParserV2& rtcpParser,
                       RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);

    void HandleTransportFeedback(
        RTCPUtility::RTCPParserV2* rtcp_parser,
        RTCPHelp::RTCPPacketInformation* rtcp_packet_information);

 private:
  typedef std::map<uint32_t, RTCPHelp::RTCPReceiveInformation*>
      ReceivedInfoMap;
  // RTCP report block information mapped by remote SSRC.
  typedef std::map<uint32_t, RTCPHelp::RTCPReportBlockInformation*>
      ReportBlockInfoMap;
  // RTCP report block information map mapped by source SSRC.
  typedef std::map<uint32_t, ReportBlockInfoMap> ReportBlockMap;

  RTCPHelp::RTCPReportBlockInformation* CreateOrGetReportBlockInformation(
      uint32_t remote_ssrc, uint32_t source_ssrc)
          EXCLUSIVE_LOCKS_REQUIRED(_criticalSectionRTCPReceiver);
  RTCPHelp::RTCPReportBlockInformation* GetReportBlockInformation(
      uint32_t remote_ssrc, uint32_t source_ssrc) const
          EXCLUSIVE_LOCKS_REQUIRED(_criticalSectionRTCPReceiver);

  Clock* const _clock;
  const bool receiver_only_;
  RTCPMethod _method;
  int64_t _lastReceived;
  ModuleRtpRtcpImpl& _rtpRtcp;

  CriticalSectionWrapper* _criticalSectionFeedbacks;
  RtcpBandwidthObserver* const _cbRtcpBandwidthObserver;
  RtcpIntraFrameObserver* const _cbRtcpIntraFrameObserver;
  TransportFeedbackObserver* const _cbTransportFeedbackObserver;

  CriticalSectionWrapper* _criticalSectionRTCPReceiver;
  uint32_t main_ssrc_;
  uint32_t _remoteSSRC;
  std::set<uint32_t> registered_ssrcs_;

  // Received send report
  RTCPSenderInfo _remoteSenderInfo;
  // when did we receive the last send report
  uint32_t _lastReceivedSRNTPsecs;
  uint32_t _lastReceivedSRNTPfrac;

  // Received XR receive time report.
  RtcpReceiveTimeInfo _remoteXRReceiveTimeInfo;
  // Time when the report was received.
  uint32_t _lastReceivedXRNTPsecs;
  uint32_t _lastReceivedXRNTPfrac;
  // Estimated rtt, zero when there is no valid estimate.
  int64_t xr_rr_rtt_ms_;

  // Received report blocks.
  ReportBlockMap _receivedReportBlockMap
      GUARDED_BY(_criticalSectionRTCPReceiver);
  ReceivedInfoMap _receivedInfoMap;
  std::map<uint32_t, RTCPUtility::RTCPCnameInformation*> _receivedCnameMap;

  uint32_t _packetTimeOutMS;

  // The last time we received an RTCP RR.
  int64_t _lastReceivedRrMs;

  // The time we last received an RTCP RR telling we have successfully
  // delivered RTP packet to the remote side.
  int64_t _lastIncreasedSequenceNumberMs;

  RtcpStatisticsCallback* stats_callback_ GUARDED_BY(_criticalSectionFeedbacks);

  RtcpPacketTypeCounterObserver* const packet_type_counter_observer_;
  RtcpPacketTypeCounter packet_type_counter_;

  RTCPUtility::NackStats nack_stats_;

  size_t num_skipped_packets_;
  int64_t last_skipped_packets_warning_;
};
}  // namespace webrtc
#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_RECEIVER_H_