335 lines
10 KiB
C
335 lines
10 KiB
C
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: RTCPPacket.h
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Contains: RTCPReceiverPacket de-packetizing classes
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*/
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//#define DEBUG_RTCP_PACKETS 1
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#ifndef _RTCPPACKET_H_
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#define _RTCPPACKET_H_
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#include <stdlib.h>
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#include "SafeStdLib.h"
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#ifndef __Win32__
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#include <sys/types.h>
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#include <netinet/in.h>
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#endif
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#include "OSHeaders.h"
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class RTCPPacket
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{
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public:
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// Packet types
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enum
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{
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kReceiverPacketType = 201, //UInt32
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kSDESPacketType = 202, //UInt32
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kAPPPacketType = 204 //UInt32
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};
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RTCPPacket() : fReceiverPacketBuffer(NULL) {}
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virtual ~RTCPPacket() {}
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//Call this before any accessor method. Returns true if successful, false otherwise
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Bool16 ParsePacket(UInt8* inPacketBuffer, UInt32 inPacketLen);
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inline int GetVersion();
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inline Bool16 GetHasPadding();
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inline int GetReportCount();
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inline UInt8 GetPacketType();
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inline UInt16 GetPacketLength(); //in 32-bit words
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inline UInt32 GetPacketSSRC();
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inline SInt16 GetHeader();
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UInt8* GetPacketBuffer() { return fReceiverPacketBuffer; }
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//Bool16 IsValidPacket();
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virtual void Dump();
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enum
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{
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kRTCPPacketSizeInBytes = 8, //All are UInt32s
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kRTCPHeaderSizeInBytes = 4
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};
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protected:
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UInt8* fReceiverPacketBuffer;
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enum
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{
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kVersionOffset = 0,
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kVersionMask = 0xC0000000UL,
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kVersionShift = 30,
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kHasPaddingOffset = 0,
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kHasPaddingMask = 0x20000000UL,
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kReportCountOffset = 0,
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kReportCountMask = 0x1F000000UL,
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kReportCountShift = 24,
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kPacketTypeOffset = 0,
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kPacketTypeMask = 0x00FF0000UL,
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kPacketTypeShift = 16,
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kPacketLengthOffset = 0,
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kPacketLengthMask = 0x0000FFFFUL,
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kPacketSourceIDOffset = 4, //packet sender SSRC
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kPacketSourceIDSize = 4, //
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kSupportedRTCPVersion = 2
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};
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};
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class SourceDescriptionPacket : public RTCPPacket
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{
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public:
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SourceDescriptionPacket() : RTCPPacket() {}
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Bool16 ParseSourceDescription(UInt8* inPacketBuffer, UInt32 inPacketLength)
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{ return ParsePacket(inPacketBuffer, inPacketLength); }
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private:
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};
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class RTCPReceiverPacket : public RTCPPacket
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{
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public:
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RTCPReceiverPacket() : RTCPPacket(), fRTCPReceiverReportArray(NULL) {}
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//Call this before any accessor method. Returns true if successful, false otherwise
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virtual Bool16 ParseReport(UInt8* inPacketBuffer, UInt32 inPacketLength);
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inline UInt32 GetReportSourceID(int inReportNum);
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UInt8 GetFractionLostPackets(int inReportNum);
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UInt32 GetTotalLostPackets(int inReportNum);
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inline UInt32 GetHighestSeqNumReceived(int inReportNum);
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inline UInt32 GetJitter(int inReportNum);
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inline UInt32 GetLastSenderReportTime(int inReportNum);
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inline UInt32 GetLastSenderReportDelay(int inReportNum); //expressed in units of 1/65536 seconds
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UInt32 GetCumulativeFractionLostPackets();
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UInt32 GetCumulativeTotalLostPackets();
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UInt32 GetCumulativeJitter();
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//Bool16 IsValidPacket();
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virtual void Dump(); //Override
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protected:
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inline int RecordOffset(int inReportNum);
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UInt8* fRTCPReceiverReportArray; //points into fReceiverPacketBuffer
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enum
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{
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kReportBlockOffsetSizeInBytes = 24, //All are UInt32s
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kReportBlockOffset = kPacketSourceIDOffset + kPacketSourceIDSize,
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kReportSourceIDOffset = 0, //SSRC for this report
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kFractionLostOffset = 4,
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kFractionLostMask = 0xFF000000UL,
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kFractionLostShift = 24,
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kTotalLostPacketsOffset = 4,
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kTotalLostPacketsMask = 0x00FFFFFFUL,
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kHighestSeqNumReceivedOffset = 8,
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kJitterOffset = 12,
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kLastSenderReportOffset = 16,
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kLastSenderReportDelayOffset = 20
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};
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};
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class RTCPSenderReportPacket : public RTCPReceiverPacket
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{
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public:
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Bool16 ParseReport(UInt8* inPacketBuffer, UInt32 inPacketLength);
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SInt64 GetNTPTimeStamp()
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{
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UInt32* fieldPtr = (UInt32*)&fReceiverPacketBuffer[kSRPacketNTPTimeStampMSW];
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SInt64 timestamp = ntohl(*fieldPtr);
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fieldPtr = (UInt32*)&fReceiverPacketBuffer[kSRPacketNTPTimeStampLSW];
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return (timestamp << 32) | ntohl(*fieldPtr);
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}
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UInt32 GetRTPTimeStamp()
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{
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UInt32* fieldPtr = (UInt32*)&fReceiverPacketBuffer[kSRPacketRTPTimeStamp];
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return ntohl(*fieldPtr);
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}
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protected:
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enum
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{
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kRTCPSRPacketSenderInfoInBytes = 20,
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kSRPacketNTPTimeStampMSW = 8,
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kSRPacketNTPTimeStampLSW = 12,
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kSRPacketRTPTimeStamp = 16
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};
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};
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/************** RTCPPacket inlines **************/
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inline int RTCPPacket::GetVersion()
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{
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UInt32* theVersionPtr = (UInt32*)&fReceiverPacketBuffer[kVersionOffset];
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UInt32 theVersion = ntohl(*theVersionPtr);
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return (int) ((theVersion & kVersionMask) >> kVersionShift);
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}
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inline Bool16 RTCPPacket::GetHasPadding()
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{
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UInt32* theHasPaddingPtr = (UInt32*)&fReceiverPacketBuffer[kHasPaddingOffset];
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UInt32 theHasPadding = ntohl(*theHasPaddingPtr);
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return (Bool16) (theHasPadding & kHasPaddingMask);
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}
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inline int RTCPPacket::GetReportCount()
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{
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UInt32* theReportCountPtr = (UInt32*)&fReceiverPacketBuffer[kReportCountOffset];
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UInt32 theReportCount = ntohl(*theReportCountPtr);
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return (int) ((theReportCount & kReportCountMask) >> kReportCountShift);
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}
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inline UInt8 RTCPPacket::GetPacketType()
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{
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UInt32* thePacketTypePtr = (UInt32*)&fReceiverPacketBuffer[kPacketTypeOffset];
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UInt32 thePacketType = ntohl(*thePacketTypePtr);
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return (UInt8) ((thePacketType & kPacketTypeMask) >> kPacketTypeShift);
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}
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inline UInt16 RTCPPacket::GetPacketLength()
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{
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UInt32* fieldPtr = (UInt32*)&fReceiverPacketBuffer[kPacketLengthOffset];
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UInt32 field = ntohl(*fieldPtr);
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return (UInt16) (field & kPacketLengthMask);
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}
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inline UInt32 RTCPPacket::GetPacketSSRC()
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{
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UInt32* fieldPtr = (UInt32*)&fReceiverPacketBuffer[kPacketSourceIDOffset];
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UInt32 field = ntohl(*fieldPtr);
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return field;
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}
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inline SInt16 RTCPPacket::GetHeader(){ return (SInt16) ntohs(*(SInt16*)&fReceiverPacketBuffer[0]) ;}
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/************** RTCPReceiverPacket inlines **************/
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inline int RTCPReceiverPacket::RecordOffset(int inReportNum)
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{
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return inReportNum*kReportBlockOffsetSizeInBytes;
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}
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inline UInt32 RTCPReceiverPacket::GetReportSourceID(int inReportNum)
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{
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return (UInt32) ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kReportSourceIDOffset]) ;
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}
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inline UInt8 RTCPReceiverPacket::GetFractionLostPackets(int inReportNum)
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{
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return (UInt8) ( (ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kFractionLostOffset]) & kFractionLostMask) >> kFractionLostShift );
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}
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inline UInt32 RTCPReceiverPacket::GetTotalLostPackets(int inReportNum)
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{
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return (ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kTotalLostPacketsOffset]) & kTotalLostPacketsMask );
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}
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inline UInt32 RTCPReceiverPacket::GetHighestSeqNumReceived(int inReportNum)
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{
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return (UInt32) ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kHighestSeqNumReceivedOffset]) ;
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}
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inline UInt32 RTCPReceiverPacket::GetJitter(int inReportNum)
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{
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return (UInt32) ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kJitterOffset]) ;
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}
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inline UInt32 RTCPReceiverPacket::GetLastSenderReportTime(int inReportNum)
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{
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return (UInt32) ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kLastSenderReportOffset]) ;
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}
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inline UInt32 RTCPReceiverPacket::GetLastSenderReportDelay(int inReportNum)
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{
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return (UInt32) ntohl(*(UInt32*)&fRTCPReceiverReportArray[this->RecordOffset(inReportNum)+kLastSenderReportDelayOffset]) ;
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}
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/*
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Receiver Report
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---------------
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0 1 2 3
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0 0 0 1 1 1 1 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|V=2|P| RC | PT=RR=201 | length | header
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SSRC of packet sender |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| SSRC_1 (SSRC of first source) | report
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ block
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| fraction lost | cumulative number of packets lost | 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| extended highest sequence number received |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| interarrival jitter |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| last SR (LSR) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| delay since last SR (DLSR) |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| SSRC_2 (SSRC of second source) | report
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ block
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: ... : 2
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| profile-specific extensions |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#endif //_RTCPPACKET_H_
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