818 lines
26 KiB
C++
818 lines
26 KiB
C++
/*----------------------------------------------------------------------------
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* File: RTPRECV.C
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* Product: RTP/RTCP implementation
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* Description: Provides Receive Data Functionality.
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*
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* This listing is supplied under the terms
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* of a license agreement with Intel Corporation and
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* many not be copied nor disclosed except in accordance
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* with the terms of that agreement.
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* Copyright (c) 1995 Intel Corporation.
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*--------------------------------------------------------------------------*/
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#include "rrcm.h"
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/*---------------------------------------------------------------------------
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/ Global Variables
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/--------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------
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/ External Variables
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/--------------------------------------------------------------------------*/
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extern PRTP_CONTEXT pRTPContext;
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extern RRCM_WS RRCMws;
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#if (defined(_DEBUG) || defined(PCS_COMPLIANCE))
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//INTEROP
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extern LPInteropLogger RTPLogger;
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#endif
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/*----------------------------------------------------------------------------
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* Function : RTPReceiveCheck
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* Description: Called when a packet is received. Handles any statistical
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* processing required for RTCP.
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*
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* Input : hRTPSession: handle returned by CreateRTPSession
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RTPsocket: socket on which the packet was received
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char *pPacket: pointer to packet buffer
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* cbTransferred: Number of bytes in packet
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* pFrom: sender address
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* fromlen: sender address length
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*
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* !!! IMPORTANT NOTE !!!
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* Currently assumes CSRC = 0
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* !!! IMPORTANT NOTE !!!
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*
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* Return: Status indicating if the packet is OK or has a problem
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---------------------------------------------------------------------------*/
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DWORD RTPReceiveCheck (
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HANDLE hRTPSession,
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SOCKET RTPsocket,
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char *pPacket,
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DWORD cbTransferred,
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PSOCKADDR pFrom,
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UINT fromlen
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)
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{
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PRTP_SESSION pRTPSession = (PRTP_SESSION) hRTPSession;
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RTP_HDR_T *pRTPHeader = (RTP_HDR_T *)pPacket;
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PSSRC_ENTRY pSSRC = NULL;
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DWORD dwSSRC;
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DWORD oldSSRC;
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PSSRC_ENTRY pMySSRC;
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DWORD dwStatus = 0;
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struct sockaddr_in *pSSRCadr;
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IN_OUT_STR ("RTP : Enter RTPReceiveCheck()\n");
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ASSERT (pRTPSession);
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// If Winsock error or runt packet(used to cancel recvs), signal completion to application
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// and do not repost.
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if (cbTransferred < RTP_HDR_MIN_LEN)
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{
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// don't report closeSocket() as an error when the application
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// have some pending buffers remaining
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// notify the user if an error occured, so he can free up
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// its receive resources. The byte count is set to 0
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return RTP_RUNT_PACKET;
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}
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// Perform validity checking
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ASSERT (pRTPHeader);
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#if (defined(_DEBUG) || defined(PCS_COMPLIANCE))
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if (RTPLogger)
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{
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//INTEROP
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InteropOutput (RTPLogger,
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(BYTE FAR*)(pRTPHeader),
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(int)cbTransferred,
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RTPLOG_RECEIVED_PDU | RTP_PDU);
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}
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#endif
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// Check RTP Headers for validity. If not valid, then repost buffers
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// to the network layer for a new receive.
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if (validateRTPHeader (pRTPHeader) )
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{
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// Get pointer to SSRC entry table for this session
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// If SSRC in packet is > 1/2 MAX_RANGE of DWORD, start search from
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// tail of SSRC list, otherwise, start from front
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RRCMws.ntohl (RTPsocket, pRTPHeader->ssrc, &dwSSRC);
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if (dwSSRC > MAX_DWORD/2)
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{
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pSSRC = searchforSSRCatTail (
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(PSSRC_ENTRY)pRTPSession->pRTCPSession->RcvSSRCList.prev,
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dwSSRC);
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}
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else
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{
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pSSRC = searchforSSRCatHead (
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(PSSRC_ENTRY)pRTPSession->pRTCPSession->RcvSSRCList.next,
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dwSSRC);
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}
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// get my own SSRC used for this stream
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pMySSRC = searchForMySSRC (
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(PSSRC_ENTRY)pRTPSession->pRTCPSession->XmtSSRCList.prev,
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RTPsocket);
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ASSERT (pMySSRC);
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// is this SSRC already known on the receive list ?
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if (pSSRC == NULL)
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{
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// don't create an entry for my own packet looping back on
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// a mcast group where loopback has not been turned off
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if (pMySSRC->SSRC != dwSSRC)
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{
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// new party heard from. Create an entry for it
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pSSRC = createSSRCEntry (dwSSRC,
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pRTPSession->pRTCPSession,
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pFrom,
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fromlen,
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FALSE);
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// notify application if interested
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RRCMnotification (RRCM_NEW_SOURCE_EVENT, pSSRC, dwSSRC,
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pRTPHeader->pt);
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}
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else
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{
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// my own SSRC received back
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// A collision occurs if the SSRC in the rcvd packet is
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// equal to mine, and the network transport address is
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// different from mine.
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// A loop occurs if after a collision has been resolved the
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// SSRC collides again from the same source transport address
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pSSRCadr = (PSOCKADDR_IN)&pMySSRC->from;
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if (((PSOCKADDR_IN)pFrom)->sin_addr.S_un.S_addr !=
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pSSRCadr->sin_addr.S_un.S_addr)
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{
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// check if the source address is already in the
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// conflicting table. This identifes that somebody out
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// there is looping pckts back to me
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if (RRCMChkCollisionTable (pFrom, fromlen, pMySSRC))
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{
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RRCM_DBG_MSG ("RTP : Loop Detected ...", 0, NULL, 0,
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DBG_NOTIFY);
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// loop already known
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dwStatus |= SSRC_LOOP_DETECTED;
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}
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else
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{
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RRCM_DBG_MSG ("RTP : Collision Detected ...", 0, NULL, 0,
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DBG_NOTIFY);
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// create new entry in conflicting address table
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RRCMAddEntryToCollisionTable (pFrom, fromlen, pMySSRC);
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// send RTCP BYE packet w/ old SSRC
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RTCPsendBYE (pMySSRC, "Loop/collision detected");
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// select new SSRC
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oldSSRC = pMySSRC->SSRC;
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dwSSRC = getSSRC (pMySSRC->pRTCPses->RcvSSRCList,
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pMySSRC->pRTCPses->XmtSSRCList);
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EnterCriticalSection (&pMySSRC->critSect);
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pMySSRC->SSRC = dwSSRC;
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LeaveCriticalSection (&pMySSRC->critSect);
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// create new entry w/ old SSRC plus actual source
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// transport address in our receive list side, so the
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// packet actually en-route will be dealt with
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createSSRCEntry (oldSSRC,
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pRTPSession->pRTCPSession,
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pFrom,
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fromlen,
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FALSE);
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// notify application if interested
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RRCMnotification (RRCM_LOCAL_COLLISION_EVENT,
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pMySSRC, oldSSRC, 0);
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// loop already known
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dwStatus |= SSRC_COLLISION_DETECTED;
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}
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}
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else
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{
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// own packet looped back because the sender joined the
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// multicast group and loopback is not turned off
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dwStatus |= MCAST_LOOPBACK_NOT_OFF;
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}
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}
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}
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else if (pSSRC->dwSSRCStatus & THIRD_PARTY_COLLISION)
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{
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// this SSRC is marked as colliding. Reject the data
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dwStatus = THIRD_PARTY_COLLISION;
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}
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if (dwStatus == 0)
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{
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// do all the statistical updating stuff
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updateRTPStats (pRTPHeader, pSSRC, cbTransferred);
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// update the payload type for this SSRC
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pSSRC->PayLoadType = pRTPHeader->pt;
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} // SSRCList != NULL
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} // valid RTP Header
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else
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{
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dwStatus |= INVALID_RTP_HEADER;
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}
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IN_OUT_STR ("RTP : Exit RTPReceiveCallback()\n");
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return dwStatus;
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}
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/*----------------------------------------------------------------------------
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* Function : validateRTPHeader
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* Description: Performs basic checking of RTP Header (e.g., version number
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* and payload type range).
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*
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* Input : pRTPHeader: -> to an RTP header
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*
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* Return: TRUE, RTP Packet Header is valid
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* FALSE: Header is invalid
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---------------------------------------------------------------------------*/
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BOOL validateRTPHeader(RTP_HDR_T *pRTPHeader)
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{
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BOOL bStatus = TRUE;
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IN_OUT_STR ("RTP : Enter validateRTPHeader()\n");
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if (! pRTPHeader)
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return FALSE;
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// Check version number is correct
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if (pRTPHeader->type != RTP_TYPE)
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bStatus = FALSE;
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// Next check that the Packet types look somewhat reasonable,
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// at least out of the RTCP range
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if (pRTPHeader->pt >= RTCP_SR)
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bStatus = FALSE;
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IN_OUT_STR ("RTP : Exit validateRTPHeader()\n");
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return bStatus;
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}
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#if 0
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/*----------------------------------------------------------------------------
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* Function : RTPRecvFrom
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* Description: Intercepts receive requests from app. Handles any statistical
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* processing required for RTCP. Copies completion routine
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* from app and substitutes its own. Apps completion routine
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* will be called after RTP's completion routine gets called.
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*
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* Input : RTPsocket: RTP socket descriptor
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* pBuffers: -> to WSAbuf structure
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* dwBufferCount: Buffer count in WSAbuf structure
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* pNumBytesRecvd: -> to number of bytes received
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* pFlags: -> to flags
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* pFrom: -> to the source address
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* pFromLen: -> to source address length
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* pOverlapped: -> to overlapped I/O structure
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* pCompletionRoutine: -> to completion routine
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*
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* Return: RRCM_NoError = OK.
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* Otherwise(!=0) = Check RRCM.h file for references.
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---------------------------------------------------------------------------*/
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DWORD WINAPI RTPRecvFrom (SOCKET RTPsocket,
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LPWSABUF pBuffers,
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DWORD dwBufferCount,
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LPDWORD pNumBytesRecvd,
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LPDWORD pFlags,
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PSOCKADDR pFrom,
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LPINT pFromlen,
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LPWSAOVERLAPPED pOverlapped,
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LPWSAOVERLAPPED_COMPLETION_ROUTINE pCompletionRoutine)
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{
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int dwStatus = RRCM_NoError;
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int dwError;
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PRTP_SESSION pRTPSession;
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PRTP_BFR_LIST pRCVStruct;
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IN_OUT_STR ("RTP : Enter RTPRecvFrom()\n");
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// If RTP context doesn't exist, report error and return.
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if (pRTPContext == NULL)
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{
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RRCM_DBG_MSG ("RTP : ERROR - No RTP Instance", 0,
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__FILE__, __LINE__, DBG_CRITICAL);
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IN_OUT_STR ("RTP : Exit RTPRecvFrom()\n");
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return (MAKE_RRCM_ERROR(RRCMError_RTPInvalid));
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}
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// Search for the proper session based on incoming socket
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pRTPSession = findSessionID(RTPsocket);
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if (pRTPSession == NULL)
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{
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RRCM_DBG_MSG ("RTP : ERROR - Invalid RTP session", 0,
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__FILE__, __LINE__, DBG_CRITICAL);
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IN_OUT_STR ("RTP : Exit RTPRecvFrom()\n");
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return (MAKE_RRCM_ERROR(RRCMError_RTPInvalidSession));
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}
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// We need to associate a completionRoutine's lpOverlapped with a
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// session. We look at each buffer and associate a socket so when
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// the completion routine is called, we can pull out the socket.
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if (dwStatus = saveRCVWinsockContext(pOverlapped,
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pBuffers,
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pCompletionRoutine,
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pRTPSession,
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dwBufferCount,
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pNumBytesRecvd,
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pFlags,
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pFrom,
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pFromlen,
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RTPsocket) != RRCM_NoError)
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{
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RRCM_DBG_MSG ("RTP : ERROR - Out of resources...", 0,
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__FILE__, __LINE__, DBG_NOTIFY);
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IN_OUT_STR ("RTP : Exit RTPRecvFrom()\n");
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return (MAKE_RRCM_ERROR(dwStatus));
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}
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// Forward to winsock, substituting our completion routine for the
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// one handed to us.
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dwStatus = RRCMws.recvFrom (RTPsocket,
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pBuffers,
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dwBufferCount,
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pNumBytesRecvd,
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pFlags,
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pFrom,
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pFromlen,
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pOverlapped,
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RTPReceiveCallback);
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// Check if Winsock Call succeeded
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if (dwStatus != 0)
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{
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// If serious error, the receive request won't proceed so
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// we must undo all our work
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dwError = GetLastError();
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if ((dwError != WSA_IO_PENDING) && (dwError != WSAEMSGSIZE))
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{
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// Reinstate the Apps WSAEVENT
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pRCVStruct = (PRTP_BFR_LIST)pOverlapped->hEvent;
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pOverlapped->hEvent = pRCVStruct->hEvent;
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RRCM_DBG_MSG ("RTP : ERROR - WSARecvFrom()", dwError,
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__FILE__, __LINE__, DBG_NOTIFY);
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// Return the struct to the free queue
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addToHeadOfList (&pRTPSession->pRTPFreeList,
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(PLINK_LIST)pRCVStruct,
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&pRTPSession->critSect);
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}
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}
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IN_OUT_STR ("RTP : Exit RTPRecvFrom()\n");
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return (dwStatus);
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}
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/*----------------------------------------------------------------------------
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* Function : RTPReceiveCallback
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* Description: Callback routine from Winsock2 Handles any statistical
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* processing required for RTCP. Copies completion routine
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* from app and substitutes its own. Apps completion routine
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* will be called after RTP's completion routine gets called.
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*
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* Input : dwError: I/O completion error code
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* cbTransferred: Number of bytes transferred
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* pOverlapped: -> to overlapped I/O structure
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* dwFlags: Flags
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*
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* !!! IMPORTANT NOTE !!!
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* Currently assumes CSRC = 0
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* !!! IMPORTANT NOTE !!!
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*
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* Return: None
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---------------------------------------------------------------------------*/
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void CALLBACK RTPReceiveCallback (DWORD dwError,
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DWORD cbTransferred,
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LPWSAOVERLAPPED pOverlapped,
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DWORD dwFlags)
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{
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PRTP_SESSION pRTPSession;
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RTP_HDR_T *pRTPHeader;
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PRTP_BFR_LIST pRCVStruct;
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PSSRC_ENTRY pSSRC = NULL;
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DWORD dwSSRC;
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DWORD oldSSRC;
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PSSRC_ENTRY pMySSRC;
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DWORD dwRequeue = 0;
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struct sockaddr_in *pSSRCadr;
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IN_OUT_STR ("RTP : Enter RTPReceiveCallback()\n");
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// GEORGEJ: catch Winsock 2 bug (94903) where I get a bogus callback
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// after WSARecv returns WSAEMSGSIZE.
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if (!dwError && ((int) cbTransferred < 0)) {
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RRCM_DBG_MSG ("RTP : RCV Callback : bad cbTransferred", cbTransferred,
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__FILE__, __LINE__, DBG_ERROR);
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return;
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}
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// The returning hEvent in the LPWSAOVERLAPPED struct contains the
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// information mapping the session and the buffer.
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pRCVStruct = (PRTP_BFR_LIST)pOverlapped->hEvent;
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// Search for the proper session based on incoming socket
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pRTPSession = (PRTP_SESSION)pRCVStruct->pSession;
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ASSERT (pRTPSession);
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// If Winsock error or runt packet(used to cancel recvs), signal completion to application
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// and do not repost.
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if (dwError || cbTransferred < RTP_HDR_MIN_LEN)
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{
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// don't report closeSocket() as an error when the application
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// have some pending buffers remaining
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if ((dwError != 65534) && (dwError == WSA_OPERATION_ABORTED))
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{
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RRCM_DBG_MSG ("RTP : RCV Callback", dwError,
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__FILE__, __LINE__, DBG_ERROR);
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}
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// notify the user if an error occured, so he can free up
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// its receive resources. The byte count is set to 0
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// Reinstate the AppSs WSAEVENT
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pOverlapped->hEvent = pRCVStruct->hEvent;
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// And call the apps completion routine
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pRCVStruct->pfnCompletionNotification (dwError,
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cbTransferred,
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pOverlapped,
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dwFlags);
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// Return the struct to the free queue
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addToHeadOfList (&pRTPSession->pRTPFreeList,
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(PLINK_LIST)pRCVStruct,
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&pRTPSession->critSect);
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IN_OUT_STR ("RTP : Exit RTPReceiveCallback()\n");
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return;
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}
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// Perform validity checking
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pRTPHeader = (RTP_HDR_T *)pRCVStruct->pBuffer->buf;
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ASSERT (pRTPHeader);
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#if (defined(_DEBUG) || defined(PCS_COMPLIANCE))
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if (RTPLogger)
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{
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//INTEROP
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InteropOutput (RTPLogger,
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(BYTE FAR*)(pRCVStruct->pBuffer->buf),
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(int)cbTransferred,
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RTPLOG_RECEIVED_PDU | RTP_PDU);
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}
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#endif
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// Check RTP Headers for validity. If not valid, then repost buffers
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// to the network layer for a new receive.
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if (validateRTPHeader (pRTPHeader) && (dwError == 0))
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{
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// Get pointer to SSRC entry table for this session
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// If SSRC in packet is > 1/2 MAX_RANGE of DWORD, start search from
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// tail of SSRC list, otherwise, start from front
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RRCMws.ntohl (pRCVStruct->RTPsocket, pRTPHeader->ssrc, &dwSSRC);
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if (dwSSRC > MAX_DWORD/2)
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{
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pSSRC = searchforSSRCatTail (
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(PSSRC_ENTRY)pRTPSession->pRTCPSession->RcvSSRCList.prev,
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dwSSRC);
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}
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else
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{
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pSSRC = searchforSSRCatHead (
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(PSSRC_ENTRY)pRTPSession->pRTCPSession->RcvSSRCList.next,
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dwSSRC);
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}
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// get my own SSRC used for this stream
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pMySSRC = searchForMySSRC (
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(PSSRC_ENTRY)pRTPSession->pRTCPSession->XmtSSRCList.prev,
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pRCVStruct->RTPsocket);
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ASSERT (pMySSRC);
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// is this SSRC already known on the receive list ?
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if (pSSRC == NULL)
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{
|
|
// don't create an entry for my own packet looping back on
|
|
// a mcast group where loopback has not been turned off
|
|
if (pMySSRC->SSRC != dwSSRC)
|
|
{
|
|
// new party heard from. Create an entry for it
|
|
pSSRC = createSSRCEntry (dwSSRC,
|
|
pRTPSession->pRTCPSession,
|
|
(PSOCKADDR)pRCVStruct->pFrom,
|
|
(DWORD)*pRCVStruct->pFromlen,
|
|
FALSE);
|
|
|
|
// notify application if interested
|
|
RRCMnotification (RRCM_NEW_SOURCE_EVENT, pSSRC, dwSSRC,
|
|
pRTPHeader->pt);
|
|
}
|
|
else
|
|
{
|
|
// my own SSRC received back
|
|
|
|
// A collision occurs if the SSRC in the rcvd packet is
|
|
// equal to mine, and the network transport address is
|
|
// different from mine.
|
|
// A loop occurs if after a collision has been resolved the
|
|
// SSRC collides again from the same source transport address
|
|
pSSRCadr = (PSOCKADDR_IN)&pMySSRC->from;
|
|
if (((PSOCKADDR_IN)pRCVStruct->pFrom)->sin_addr.S_un.S_addr !=
|
|
pSSRCadr->sin_addr.S_un.S_addr)
|
|
{
|
|
// check if the source address is already in the
|
|
// conflicting table. This identifes that somebody out
|
|
// there is looping pckts back to me
|
|
if (RRCMChkCollisionTable ((PSOCKADDR)pRCVStruct->pFrom,*pRCVStruct->pFromlen, pMySSRC))
|
|
{
|
|
RRCM_DBG_MSG ("RTP : Loop Detected ...", 0, NULL, 0,
|
|
DBG_NOTIFY);
|
|
|
|
// loop already known
|
|
dwRequeue |= SSRC_LOOP_DETECTED;
|
|
}
|
|
else
|
|
{
|
|
RRCM_DBG_MSG ("RTP : Collision Detected ...", 0, NULL, 0,
|
|
DBG_NOTIFY);
|
|
|
|
// create new entry in conflicting address table
|
|
RRCMAddEntryToCollisionTable ((PSOCKADDR)pRCVStruct->pFrom,*pRCVStruct->pFromlen, pMySSRC);
|
|
|
|
// send RTCP BYE packet w/ old SSRC
|
|
RTCPsendBYE (pMySSRC, "Loop/collision detected");
|
|
|
|
// select new SSRC
|
|
oldSSRC = pMySSRC->SSRC;
|
|
dwSSRC = getSSRC (pMySSRC->pRTCPses->RcvSSRCList,
|
|
pMySSRC->pRTCPses->XmtSSRCList);
|
|
|
|
EnterCriticalSection (&pMySSRC->critSect);
|
|
pMySSRC->SSRC = dwSSRC;
|
|
LeaveCriticalSection (&pMySSRC->critSect);
|
|
|
|
// create new entry w/ old SSRC plus actual source
|
|
// transport address in our receive list side, so the
|
|
// packet actually en-route will be dealt with
|
|
createSSRCEntry (oldSSRC,
|
|
pRTPSession->pRTCPSession,
|
|
(PSOCKADDR)pRCVStruct->pFrom,
|
|
(DWORD)*pRCVStruct->pFromlen,
|
|
FALSE);
|
|
|
|
// notify application if interested
|
|
RRCMnotification (RRCM_LOCAL_COLLISION_EVENT,
|
|
pMySSRC, oldSSRC, 0);
|
|
|
|
// loop already known
|
|
dwRequeue |= SSRC_COLLISION_DETECTED;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// own packet looped back because the sender joined the
|
|
// multicast group and loopback is not turned off
|
|
dwRequeue |= MCAST_LOOPBACK_NOT_OFF;
|
|
}
|
|
}
|
|
}
|
|
else if (pSSRC->dwSSRCStatus & THIRD_PARTY_COLLISION)
|
|
{
|
|
// this SSRC is marked as colliding. Reject the data
|
|
dwRequeue = THIRD_PARTY_COLLISION;
|
|
}
|
|
|
|
if ((pSSRC != NULL) && (dwRequeue == 0))
|
|
{
|
|
// do all the statistical updating stuff
|
|
updateRTPStats (pRTPHeader, pSSRC, cbTransferred);
|
|
|
|
// update the payload type for this SSRC
|
|
pSSRC->PayLoadType = pRTPHeader->pt;
|
|
|
|
// Reinstate the AppSs WSAEVENT
|
|
pOverlapped->hEvent = pRCVStruct->hEvent;
|
|
|
|
// And call the apps completion routine
|
|
pRCVStruct->pfnCompletionNotification (dwError,
|
|
cbTransferred,
|
|
pOverlapped,
|
|
dwFlags);
|
|
|
|
// Return the struct to the free queue
|
|
addToHeadOfList (&pRTPSession->pRTPFreeList,
|
|
(PLINK_LIST)pRCVStruct,
|
|
&pRTPSession->critSect);
|
|
} // SSRCList != NULL
|
|
} // valid RTP Header
|
|
else
|
|
{
|
|
dwRequeue |= INVALID_RTP_HEADER;
|
|
}
|
|
|
|
if (dwRequeue)
|
|
{
|
|
// The RTP packet was invalid for some reason
|
|
RTPpostRecvBfr (dwError, cbTransferred, pOverlapped, dwFlags);
|
|
}
|
|
|
|
IN_OUT_STR ("RTP : Exit RTPReceiveCallback()\n");
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* Function : saveRCVWinsockContext
|
|
* Description: Saves context for this buffer so that when a completion
|
|
* routine returns with a handle, we know exactly what
|
|
* buffer/stream this refers to.
|
|
*
|
|
* Input : pOverlapped : -> to overlapped structure
|
|
* pBuffers : -> to WSA buffers
|
|
* pFunc : -> to completion routine
|
|
* pSession : -> to the RTP session
|
|
* dwBufferCount : Number of WSA buffers
|
|
* pNumBytesRecvd : -> to number of bytes received
|
|
* pFlags : -> to flags
|
|
* pFrom : -> to the From address field
|
|
* pFromlen : -> to the from address field length
|
|
* RTPsocket : RTP socket descriptor
|
|
*
|
|
* Return: RRCM_NoError = OK.
|
|
* Otherwise(!=0) = Check RRCM.h file for references.
|
|
---------------------------------------------------------------------------*/
|
|
DWORD CALLBACK saveRCVWinsockContext(LPWSAOVERLAPPED pOverlapped,
|
|
LPWSABUF pBuffers,
|
|
LPWSAOVERLAPPED_COMPLETION_ROUTINE pFunc,
|
|
PRTP_SESSION pSession,
|
|
DWORD dwBufferCount,
|
|
LPDWORD pNumBytesRecvd,
|
|
LPDWORD pFlags,
|
|
LPVOID pFrom,
|
|
LPINT pFromlen,
|
|
SOCKET RTPsocket)
|
|
{
|
|
PRTP_BFR_LIST pNewCell;
|
|
DWORD dwStatus = RRCM_NoError;
|
|
DWORD numCells = NUM_FREE_CONTEXT_CELLS;
|
|
|
|
IN_OUT_STR ("RTP : Enter saveRCVWinsockContext()\n");
|
|
|
|
// Get a PRTP Buffer from the free list
|
|
pNewCell = (PRTP_BFR_LIST)removePcktFromTail (
|
|
(PLINK_LIST)&pSession->pRTPFreeList,
|
|
&pSession->critSect);
|
|
|
|
if (pNewCell == NULL)
|
|
{
|
|
// try to reallocate some free cells
|
|
if (pSession->dwNumTimesFreeListAllocated <= MAXNUM_CONTEXT_CELLS_REALLOC)
|
|
{
|
|
// increment the number of reallocated times even if the realloc
|
|
// fails next. Will avoid trying to realloc of a realloc problem
|
|
pSession->dwNumTimesFreeListAllocated++;
|
|
|
|
if (allocateLinkedList (&pSession->pRTPFreeList,
|
|
pSession->hHeapFreeList,
|
|
&numCells,
|
|
sizeof(RTP_BFR_LIST),
|
|
&pSession->critSect) == RRCM_NoError)
|
|
{
|
|
pNewCell = (PRTP_BFR_LIST)removePcktFromTail (
|
|
(PLINK_LIST)&pSession->pRTPFreeList,
|
|
&pSession->critSect);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pNewCell != NULL)
|
|
{
|
|
// Initialize the params
|
|
pNewCell->hEvent = pOverlapped->hEvent;
|
|
pNewCell->pBuffer = pBuffers;
|
|
pNewCell->pSession = pSession;
|
|
pNewCell->dwFlags = *pFlags;
|
|
pNewCell->pFrom = pFrom;
|
|
pNewCell->pFromlen = pFromlen;
|
|
pNewCell->RTPsocket = RTPsocket;
|
|
pNewCell->dwBufferCount = dwBufferCount;
|
|
pNewCell->pfnCompletionNotification = pFunc;
|
|
|
|
// Overwrite the hEvent handed down from app.
|
|
// Will return the real one when the completion routine is called
|
|
pOverlapped->hEvent = (WSAEVENT)pNewCell;
|
|
}
|
|
else
|
|
dwStatus = RRCMError_RTPResources;
|
|
|
|
IN_OUT_STR ("RTP : Exit saveRCVWinsockContext()\n");
|
|
|
|
return (dwStatus);
|
|
}
|
|
|
|
|
|
|
|
/*----------------------------------------------------------------------------
|
|
* Function : RTPpostRecvBfr
|
|
* Description: RTP post a receive buffer to Winsock
|
|
*
|
|
* Input : dwError : Error code
|
|
* cbTransferred : Bytes transferred
|
|
* pOverlapped : -> to overlapped structure
|
|
* dwFlags : Flags
|
|
*
|
|
* Return: None
|
|
---------------------------------------------------------------------------*/
|
|
void RTPpostRecvBfr (DWORD dwError,
|
|
DWORD cbTransferred,
|
|
LPWSAOVERLAPPED pOverlapped,
|
|
DWORD dwFlags)
|
|
{
|
|
DWORD dwStatus;
|
|
PRTP_BFR_LIST pRCVStruct;
|
|
PRTP_SESSION pRTPSession;
|
|
|
|
IN_OUT_STR ("RTP : Enter RTPpostRecvBfr\n");
|
|
|
|
// Reuse the packet with another receive
|
|
pRCVStruct = (PRTP_BFR_LIST)pOverlapped->hEvent;
|
|
|
|
// Corresponding RTP session
|
|
pRTPSession = (PRTP_SESSION)pRCVStruct->pSession;
|
|
|
|
dwStatus = RRCMws.recvFrom (pRCVStruct->RTPsocket,
|
|
pRCVStruct->pBuffer,
|
|
pRCVStruct->dwBufferCount,
|
|
&cbTransferred,
|
|
&pRCVStruct->dwFlags,
|
|
(PSOCKADDR)pRCVStruct->pFrom,
|
|
pRCVStruct->pFromlen,
|
|
pOverlapped,
|
|
RTPReceiveCallback);
|
|
|
|
// Check if Winsock Call succeeded
|
|
if (dwStatus == SOCKET_ERROR)
|
|
{
|
|
// If serious error, the receive request won't proceed
|
|
dwStatus = GetLastError();
|
|
if ((dwStatus != WSA_IO_PENDING) && (dwStatus != WSAEMSGSIZE))
|
|
{
|
|
RRCM_DBG_MSG ("RTP : ERROR - WSARecvFrom()", dwError,
|
|
__FILE__, __LINE__, DBG_ERROR);
|
|
|
|
// notify the user if an error occured, so he can free up
|
|
// its receive resources. The byte count is set to 0
|
|
|
|
// Reinstate the AppSs WSAEVENT
|
|
pOverlapped->hEvent = pRCVStruct->hEvent;
|
|
|
|
// And call the apps completion routine
|
|
pRCVStruct->pfnCompletionNotification (dwStatus,
|
|
0,
|
|
pOverlapped,
|
|
dwFlags);
|
|
|
|
// Return the receive structure to the free list
|
|
addToHeadOfList (&pRTPSession->pRTPFreeList,
|
|
(PLINK_LIST)pRCVStruct,
|
|
&pRTPSession->critSect);
|
|
}
|
|
}
|
|
|
|
IN_OUT_STR ("RTP : Exit RTPpostRecvBfr\n");
|
|
}
|
|
#endif
|
|
|
|
|
|
// [EOF]
|
|
|