sdrangel/qrtplib/rtpsession.cpp

/*

 This file is a part of JRTPLIB
 Copyright (c) 1999-2017 Jori Liesenborgs

 Contact: jori.liesenborgs@gmail.com

 This library was developed at the Expertise Centre for Digital Media
 (http://www.edm.uhasselt.be), a research center of the Hasselt University
 (http://www.uhasselt.be). The library is based upon work done for
 my thesis at the School for Knowledge Technology (Belgium/The Netherlands).

 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
 to deal in the Software without restriction, including without limitation
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 IN THE SOFTWARE.

 */

#include "rtpsession.h"
#include "rtperrors.h"
// TODO: this is for Create with transmitter creation. See if we keep it.
//#include "rtpudpv4transmitter.h"
//#include "rtptcptransmitter.h"
//#include "rtpexternaltransmitter.h"
#include "rtpsessionparams.h"
#include "rtpdefines.h"
#include "rtprawpacket.h"
#include "rtppacket.h"
#include "rtptimeutilities.h"
#include "rtprandomrand48.h"
#include "rtprandomrands.h"
#include "rtprandomurandom.h"
#ifdef RTP_SUPPORT_SENDAPP
#include "rtcpcompoundpacket.h"
#endif // RTP_SUPPORT_SENDAPP
#include "rtpinternalutils.h"

#include <unistd.h>
#include <stdlib.h>

#include <QHostInfo>


namespace qrtplib
{

RTPSession::RTPSession(RTPRandom *r) :
        rtprnd(GetRandomNumberGenerator(r)),
        sources(*this),
        packetbuilder(*rtprnd),
        rtcpsched(sources, *rtprnd),
        rtcpbuilder(sources, packetbuilder)
{
    // We're not going to set these flags in Create, so that the constructor of a derived class
    // can already change them
    m_changeIncomingData = false;
    m_changeOutgoingData = false;

    created = false;
    timeinit.Dummy();

    //std::cout << (void *)(rtprnd) << std::endl;
}

RTPSession::~RTPSession()
{
    Destroy();

    if (deletertprnd)
        delete rtprnd;
}

int RTPSession::Create(const RTPSessionParams &sessparams, const RTPTransmissionParams *transparams /* = 0 */, RTPTransmitter::TransmissionProtocol protocol)
{
    int status;

    if (created)
        return ERR_RTP_SESSION_ALREADYCREATED;

    usingpollthread = sessparams.IsUsingPollThread();

    useSR_BYEifpossible = sessparams.GetSenderReportForBYE();
    sentpackets = false;

    // Check max packet size

    if ((maxpacksize = sessparams.GetMaximumPacketSize()) < RTP_MINPACKETSIZE)
        return ERR_RTP_SESSION_MAXPACKETSIZETOOSMALL;

    // Initialize the transmission component

    rtptrans = 0;
    switch (protocol)
    {
    // TODO: see if we keep this Create method or use the one with the transmitter specified
//    case RTPTransmitter::IPv4UDPProto:
//        rtptrans = new RTPUDPv4Transmitter();
//        break;
//    case RTPTransmitter::ExternalProto:
//        rtptrans = new RTPExternalTransmitter();
//        break;
//    case RTPTransmitter::UserDefinedProto:
//        rtptrans = NewUserDefinedTransmitter();
//        if (rtptrans == 0)
//            return ERR_RTP_SESSION_USERDEFINEDTRANSMITTERNULL;
//        break;
//    case RTPTransmitter::TCPProto:
//        rtptrans = new RTPTCPTransmitter();
//        break;
    default:
        return ERR_RTP_SESSION_UNSUPPORTEDTRANSMISSIONPROTOCOL;
    }

    if (rtptrans == 0)
        return ERR_RTP_OUTOFMEM;
    if ((status = rtptrans->Init()) < 0)
    {
        delete rtptrans;
        return status;
    }
    if ((status = rtptrans->Create(maxpacksize, transparams)) < 0)
    {
        delete rtptrans;
        return status;
    }

    deletetransmitter = true;
    return InternalCreate(sessparams);
}

int RTPSession::Create(const RTPSessionParams &sessparams, RTPTransmitter *transmitter)
{
    int status;

    if (created)
        return ERR_RTP_SESSION_ALREADYCREATED;

    usingpollthread = sessparams.IsUsingPollThread();

    useSR_BYEifpossible = sessparams.GetSenderReportForBYE();
    sentpackets = false;

    // Check max packet size

    if ((maxpacksize = sessparams.GetMaximumPacketSize()) < RTP_MINPACKETSIZE)
        return ERR_RTP_SESSION_MAXPACKETSIZETOOSMALL;

    rtptrans = transmitter;

    if ((status = rtptrans->SetMaximumPacketSize(maxpacksize)) < 0)
        return status;

    deletetransmitter = false;
    return InternalCreate(sessparams);
}

int RTPSession::InternalCreate(const RTPSessionParams &sessparams)
{
    int status;

    // Initialize packet builder

    if ((status = packetbuilder.Init(maxpacksize)) < 0)
    {
        if (deletetransmitter)
            delete rtptrans;
        return status;
    }

    if (sessparams.GetUsePredefinedSSRC())
        packetbuilder.AdjustSSRC(sessparams.GetPredefinedSSRC());

    // Add our own ssrc to the source table

    if ((status = sources.CreateOwnSSRC(packetbuilder.GetSSRC())) < 0)
    {
        packetbuilder.Destroy();
        if (deletetransmitter)
            delete rtptrans;
        return status;
    }

    // Set the initial receive mode

    if ((status = rtptrans->SetReceiveMode(sessparams.GetReceiveMode())) < 0)
    {
        packetbuilder.Destroy();
        sources.Clear();
        if (deletetransmitter)
            delete rtptrans;
        return status;
    }

    // Init the RTCP packet builder

    double timestampunit = sessparams.GetOwnTimestampUnit();
    uint8_t buf[1024];
    std::size_t buflen = 1024;
    std::string forcedcname = sessparams.GetCNAME();

    if (forcedcname.length() == 0)
    {
        if ((status = CreateCNAME(buf, &buflen, sessparams.GetResolveLocalHostname())) < 0)
        {
            packetbuilder.Destroy();
            sources.Clear();
            if (deletetransmitter)
                delete rtptrans;
            return status;
        }
    }
    else
    {
        strncpy((char * )buf, forcedcname.c_str(), buflen);
        buf[buflen - 1] = 0;
        buflen = strlen((char *) buf);
    }

    if ((status = rtcpbuilder.Init(maxpacksize, timestampunit, buf, buflen)) < 0)
    {
        packetbuilder.Destroy();
        sources.Clear();
        if (deletetransmitter)
            delete rtptrans;
        return status;
    }

    // Set scheduler parameters

    rtcpsched.Reset();
    rtcpsched.SetHeaderOverhead(rtptrans->GetHeaderOverhead());

    RTCPSchedulerParams schedparams;

    sessionbandwidth = sessparams.GetSessionBandwidth();
    controlfragment = sessparams.GetControlTrafficFraction();

    if ((status = schedparams.SetRTCPBandwidth(sessionbandwidth * controlfragment)) < 0)
    {
        if (deletetransmitter)
            delete rtptrans;
        packetbuilder.Destroy();
        sources.Clear();
        rtcpbuilder.Destroy();
        return status;
    }
    if ((status = schedparams.SetSenderBandwidthFraction(sessparams.GetSenderControlBandwidthFraction())) < 0)
    {
        if (deletetransmitter)
            delete rtptrans;
        packetbuilder.Destroy();
        sources.Clear();
        rtcpbuilder.Destroy();
        return status;
    }
    if ((status = schedparams.SetMinimumTransmissionInterval(sessparams.GetMinimumRTCPTransmissionInterval())) < 0)
    {
        if (deletetransmitter)
            delete rtptrans;
        packetbuilder.Destroy();
        sources.Clear();
        rtcpbuilder.Destroy();
        return status;
    }
    schedparams.SetUseHalfAtStartup(sessparams.GetUseHalfRTCPIntervalAtStartup());
    schedparams.SetRequestImmediateBYE(sessparams.GetRequestImmediateBYE());

    rtcpsched.SetParameters(schedparams);

    // copy other parameters

    acceptownpackets = sessparams.AcceptOwnPackets();
    membermultiplier = sessparams.GetSourceTimeoutMultiplier();
    sendermultiplier = sessparams.GetSenderTimeoutMultiplier();
    byemultiplier = sessparams.GetBYETimeoutMultiplier();
    collisionmultiplier = sessparams.GetCollisionTimeoutMultiplier();
    notemultiplier = sessparams.GetNoteTimeoutMultiplier();

    // Do thread stuff if necessary

    created = true;
    return 0;
}

void RTPSession::Destroy()
{
    if (!created)
        return;

    if (deletetransmitter)
        delete rtptrans;
    packetbuilder.Destroy();
    rtcpbuilder.Destroy();
    rtcpsched.Reset();
    collisionlist.Clear();
    sources.Clear();

    std::list<RTCPCompoundPacket *>::const_iterator it;

    for (it = byepackets.begin(); it != byepackets.end(); it++)
        delete *it;
    byepackets.clear();

    created = false;
}

void RTPSession::BYEDestroy(const RTPTime &maxwaittime, const void *reason, std::size_t reasonlength)
{
    if (!created)
        return;

    // first, stop the thread so we have full control over all components

    RTPTime stoptime = RTPTime::CurrentTime();
    stoptime += maxwaittime;

    // add bye packet to the list if we've sent data

    RTCPCompoundPacket *pack;

    if (sentpackets)
    {
        int status;

        reasonlength = (reasonlength > RTCP_BYE_MAXREASONLENGTH) ? RTCP_BYE_MAXREASONLENGTH : reasonlength;
        status = rtcpbuilder.BuildBYEPacket(&pack, reason, reasonlength, useSR_BYEifpossible);
        if (status >= 0)
        {
            byepackets.push_back(pack);

            if (byepackets.size() == 1)
                rtcpsched.ScheduleBYEPacket(pack->GetCompoundPacketLength());
        }
    }

    if (!byepackets.empty())
    {
        bool done = false;

        while (!done)
        {
            RTPTime curtime = RTPTime::CurrentTime();

            if (curtime >= stoptime)
                done = true;

            if (rtcpsched.IsTime())
            {
                pack = *(byepackets.begin());
                byepackets.pop_front();

                SendRTCPData(pack->GetCompoundPacketData(), pack->GetCompoundPacketLength());

                OnSendRTCPCompoundPacket(pack); // we'll place this after the actual send to avoid tampering

                delete pack;
                if (!byepackets.empty()) // more bye packets to send, schedule them
                    rtcpsched.ScheduleBYEPacket((*(byepackets.begin()))->GetCompoundPacketLength());
                else
                    done = true;
            }
            if (!done)
                RTPTime::Wait(RTPTime(0, 100000));
        }
    }

    if (deletetransmitter)
        delete rtptrans;
    packetbuilder.Destroy();
    rtcpbuilder.Destroy();
    rtcpsched.Reset();
    collisionlist.Clear();
    sources.Clear();

    // clear rest of bye packets
    std::list<RTCPCompoundPacket *>::const_iterator it;

    for (it = byepackets.begin(); it != byepackets.end(); it++)
        delete *it;
    byepackets.clear();

    created = false;
}

bool RTPSession::IsActive()
{
    return created;
}

uint32_t RTPSession::GetLocalSSRC()
{
    if (!created)
        return 0;

    uint32_t ssrc;

    ssrc = packetbuilder.GetSSRC();
    return ssrc;
}

int RTPSession::AddDestination(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->AddDestination(addr);
}

int RTPSession::DeleteDestination(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->DeleteDestination(addr);
}

void RTPSession::ClearDestinations()
{
    if (!created)
        return;
    rtptrans->ClearDestinations();
}

bool RTPSession::SupportsMulticasting()
{
    if (!created)
        return false;
    return rtptrans->SupportsMulticasting();
}

int RTPSession::JoinMulticastGroup(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->JoinMulticastGroup(addr);
}

int RTPSession::LeaveMulticastGroup(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->LeaveMulticastGroup(addr);
}

int RTPSession::SendPacket(const void *data, std::size_t len)
{
    int status;

    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    if ((status = packetbuilder.BuildPacket(data, len)) < 0)
    {
        return status;
    }
    if ((status = SendRTPData(packetbuilder.GetPacket(), packetbuilder.GetPacketLength())) < 0)
    {
        return status;
    }

    sources.SentRTPPacket();
    sentpackets = true;
    return 0;
}

int RTPSession::SendPacket(const void *data, std::size_t len, uint8_t pt, bool mark, uint32_t timestampinc)
{
    int status;

    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    if ((status = packetbuilder.BuildPacket(data, len, pt, mark, timestampinc)) < 0)
    {
        return status;
    }
    if ((status = SendRTPData(packetbuilder.GetPacket(), packetbuilder.GetPacketLength())) < 0)
    {
        return status;
    }

    sources.SentRTPPacket();
    sentpackets = true;
    return 0;
}

int RTPSession::SendPacketEx(const void *data, std::size_t len, uint16_t hdrextID, const void *hdrextdata, std::size_t numhdrextwords)
{
    int status;

    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    if ((status = packetbuilder.BuildPacketEx(data, len, hdrextID, hdrextdata, numhdrextwords)) < 0)
    {
        return status;
    }
    if ((status = SendRTPData(packetbuilder.GetPacket(), packetbuilder.GetPacketLength())) < 0)
    {
        return status;
    }

    sources.SentRTPPacket();
    sentpackets = true;
    return 0;
}

int RTPSession::SendPacketEx(const void *data, std::size_t len, uint8_t pt, bool mark, uint32_t timestampinc, uint16_t hdrextID, const void *hdrextdata, std::size_t numhdrextwords)
{
    int status;

    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    if ((status = packetbuilder.BuildPacketEx(data, len, pt, mark, timestampinc, hdrextID, hdrextdata, numhdrextwords)) < 0)
    {
        return status;
    }
    if ((status = SendRTPData(packetbuilder.GetPacket(), packetbuilder.GetPacketLength())) < 0)
    {
        return status;
    }

    sources.SentRTPPacket();
    sentpackets = true;
    return 0;
}

#ifdef RTP_SUPPORT_SENDAPP

int RTPSession::SendRTCPAPPPacket(uint8_t subtype, const uint8_t name[4], const void *appdata, std::size_t appdatalen)
{
    int status;

    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    uint32_t ssrc = packetbuilder.GetSSRC();

    RTCPCompoundPacketBuilder pb;

    status = pb.InitBuild(maxpacksize);

    if (status < 0)
        return status;

    //first packet in an rtcp compound packet should always be SR or RR
    if ((status = pb.StartReceiverReport(ssrc)) < 0)
        return status;

    //add SDES packet with CNAME item
    if ((status = pb.AddSDESSource(ssrc)) < 0)
        return status;

    std::size_t owncnamelen = 0;
    uint8_t *owncname = rtcpbuilder.GetLocalCNAME(&owncnamelen);

    if ((status = pb.AddSDESNormalItem(RTCPSDESPacket::CNAME, owncname, owncnamelen)) < 0)
    {
        return status;
    }

    //add our application specific packet
    if ((status = pb.AddAPPPacket(subtype, ssrc, name, appdata, appdatalen)) < 0)
        return status;

    if ((status = pb.EndBuild()) < 0)
        return status;

    //send packet
    status = SendRTCPData(pb.GetCompoundPacketData(), pb.GetCompoundPacketLength());
    if (status < 0)
        return status;

    sentpackets = true;

    return pb.GetCompoundPacketLength();
}

#endif // RTP_SUPPORT_SENDAPP

int RTPSession::SendRawData(const void *data, std::size_t len, bool usertpchannel)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    if (usertpchannel)
        status = rtptrans->SendRTPData(data, len);
    else
        status = rtptrans->SendRTCPData(data, len);
    return status;
}

int RTPSession::SetDefaultPayloadType(uint8_t pt)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = packetbuilder.SetDefaultPayloadType(pt);
    return status;
}

int RTPSession::SetDefaultMark(bool m)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = packetbuilder.SetDefaultMark(m);
    return status;
}

int RTPSession::SetDefaultTimestampIncrement(uint32_t timestampinc)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = packetbuilder.SetDefaultTimestampIncrement(timestampinc);
    return status;
}

int RTPSession::IncrementTimestamp(uint32_t inc)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = packetbuilder.IncrementTimestamp(inc);
    return status;
}

int RTPSession::IncrementTimestampDefault()
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = packetbuilder.IncrementTimestampDefault();
    return status;
}

int RTPSession::SetPreTransmissionDelay(const RTPTime &delay)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = rtcpbuilder.SetPreTransmissionDelay(delay);
    return status;
}

RTPTransmissionInfo *RTPSession::GetTransmissionInfo()
{
    if (!created)
        return 0;
    return rtptrans->GetTransmissionInfo();
}

void RTPSession::DeleteTransmissionInfo(RTPTransmissionInfo *inf)
{
    if (!created)
        return;
    rtptrans->DeleteTransmissionInfo(inf);
}

RTPTime RTPSession::GetRTCPDelay()
{
    if (!created)
        return RTPTime(0, 0);
    if (usingpollthread)
        return RTPTime(0, 0);

    RTPTime t = rtcpsched.GetTransmissionDelay();
    return t;
}

int RTPSession::BeginDataAccess()
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return 0;
}

bool RTPSession::GotoFirstSource()
{
    if (!created)
        return false;
    return sources.GotoFirstSource();
}

bool RTPSession::GotoNextSource()
{
    if (!created)
        return false;
    return sources.GotoNextSource();
}

bool RTPSession::GotoPreviousSource()
{
    if (!created)
        return false;
    return sources.GotoPreviousSource();
}

bool RTPSession::GotoFirstSourceWithData()
{
    if (!created)
        return false;
    return sources.GotoFirstSourceWithData();
}

bool RTPSession::GotoNextSourceWithData()
{
    if (!created)
        return false;
    return sources.GotoNextSourceWithData();
}

bool RTPSession::GotoPreviousSourceWithData()
{
    if (!created)
        return false;
    return sources.GotoPreviousSourceWithData();
}

RTPSourceData *RTPSession::GetCurrentSourceInfo()
{
    if (!created)
        return 0;
    return sources.GetCurrentSourceInfo();
}

RTPSourceData *RTPSession::GetSourceInfo(uint32_t ssrc)
{
    if (!created)
        return 0;
    return sources.GetSourceInfo(ssrc);
}

RTPPacket *RTPSession::GetNextPacket()
{
    if (!created)
        return 0;
    return sources.GetNextPacket();
}

uint16_t RTPSession::GetNextSequenceNumber() const
{
    return packetbuilder.GetSequenceNumber();
}

void RTPSession::DeletePacket(RTPPacket *p)
{
    delete p;
}

int RTPSession::EndDataAccess()
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return 0;
}

int RTPSession::SetReceiveMode(RTPTransmitter::ReceiveMode m)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->SetReceiveMode(m);
}

int RTPSession::AddToIgnoreList(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->AddToIgnoreList(addr);
}

int RTPSession::DeleteFromIgnoreList(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->DeleteFromIgnoreList(addr);
}

void RTPSession::ClearIgnoreList()
{
    if (!created)
        return;
    rtptrans->ClearIgnoreList();
}

int RTPSession::AddToAcceptList(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->AddToAcceptList(addr);
}

int RTPSession::DeleteFromAcceptList(const RTPAddress &addr)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;
    return rtptrans->DeleteFromAcceptList(addr);
}

void RTPSession::ClearAcceptList()
{
    if (!created)
        return;
    rtptrans->ClearAcceptList();
}

int RTPSession::SetMaximumPacketSize(std::size_t s)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    if (s < RTP_MINPACKETSIZE)
        return ERR_RTP_SESSION_MAXPACKETSIZETOOSMALL;

    int status;

    if ((status = rtptrans->SetMaximumPacketSize(s)) < 0)
        return status;

    if ((status = packetbuilder.SetMaximumPacketSize(s)) < 0)
    {
        // restore previous max packet size
        rtptrans->SetMaximumPacketSize(maxpacksize);
        return status;
    }
    if ((status = rtcpbuilder.SetMaximumPacketSize(s)) < 0)
    {
        // restore previous max packet size
        packetbuilder.SetMaximumPacketSize(maxpacksize);
        rtptrans->SetMaximumPacketSize(maxpacksize);
        return status;
    }
    maxpacksize = s;
    return 0;
}

int RTPSession::SetSessionBandwidth(double bw)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    RTCPSchedulerParams p = rtcpsched.GetParameters();
    status = p.SetRTCPBandwidth(bw * controlfragment);
    if (status >= 0)
    {
        rtcpsched.SetParameters(p);
        sessionbandwidth = bw;
    }
    return status;
}

int RTPSession::SetTimestampUnit(double u)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;

    status = rtcpbuilder.SetTimestampUnit(u);
    return status;
}

void RTPSession::SetNameInterval(int count)
{
    if (!created)
        return;
    rtcpbuilder.SetNameInterval(count);
}

void RTPSession::SetEMailInterval(int count)
{
    if (!created)
        return;
    rtcpbuilder.SetEMailInterval(count);
}

void RTPSession::SetLocationInterval(int count)
{
    if (!created)
        return;
    rtcpbuilder.SetLocationInterval(count);
}

void RTPSession::SetPhoneInterval(int count)
{
    if (!created)
        return;
    rtcpbuilder.SetPhoneInterval(count);
}

void RTPSession::SetToolInterval(int count)
{
    if (!created)
        return;
    rtcpbuilder.SetToolInterval(count);
}

void RTPSession::SetNoteInterval(int count)
{
    if (!created)
        return;
    rtcpbuilder.SetNoteInterval(count);
}

int RTPSession::SetLocalName(const void *s, std::size_t len)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    status = rtcpbuilder.SetLocalName(s, len);
    return status;
}

int RTPSession::SetLocalEMail(const void *s, std::size_t len)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    status = rtcpbuilder.SetLocalEMail(s, len);
    return status;
}

int RTPSession::SetLocalLocation(const void *s, std::size_t len)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    status = rtcpbuilder.SetLocalLocation(s, len);
    return status;
}

int RTPSession::SetLocalPhone(const void *s, std::size_t len)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    status = rtcpbuilder.SetLocalPhone(s, len);
    return status;
}

int RTPSession::SetLocalTool(const void *s, std::size_t len)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    status = rtcpbuilder.SetLocalTool(s, len);
    return status;
}

int RTPSession::SetLocalNote(const void *s, std::size_t len)
{
    if (!created)
        return ERR_RTP_SESSION_NOTCREATED;

    int status;
    status = rtcpbuilder.SetLocalNote(s, len);
    return status;
}

int RTPSession::ProcessPolledData()
{
    RTPRawPacket *rawpack;
    int status;

    while ((rawpack = rtptrans->GetNextPacket()) != 0)
    {
        if (m_changeIncomingData)
        {
            // Provide a way to change incoming data, for decryption for example
            if (!OnChangeIncomingData(rawpack))
            {
                delete rawpack;
                continue;
            }
        }

        sources.ClearOwnCollisionFlag();

        // since our sources instance also uses the scheduler (analysis of incoming packets)
        // we'll lock it
        if ((status = sources.ProcessRawPacket(rawpack, rtptrans, acceptownpackets)) < 0)
        {
            delete rawpack;
            return status;
        }

        if (sources.DetectedOwnCollision()) // collision handling!
        {
            bool created;

            if ((status = collisionlist.UpdateAddress(&rawpack->GetSenderAddress(), rawpack->GetReceiveTime(), &created)) < 0)
            {
                delete rawpack;
                return status;
            }

            if (created) // first time we've encountered this address, send bye packet and
            {            // change our own SSRC
                bool hassentpackets = sentpackets;

                if (hassentpackets)
                {
                    // Only send BYE packet if we've actually sent data using this
                    // SSRC

                    RTCPCompoundPacket *rtcpcomppack;

                    if ((status = rtcpbuilder.BuildBYEPacket(&rtcpcomppack, 0, 0, useSR_BYEifpossible)) < 0)
                    {
                        delete rawpack;
                        return status;
                    }

                    byepackets.push_back(rtcpcomppack);
                    if (byepackets.size() == 1) // was the first packet, schedule a BYE packet (otherwise there's already one scheduled)
                    {
                        rtcpsched.ScheduleBYEPacket(rtcpcomppack->GetCompoundPacketLength());
                    }
                }
                // bye packet is built and scheduled, now change our SSRC
                // and reset the packet count in the transmitter

                uint32_t newssrc = packetbuilder.CreateNewSSRC(sources);

                sentpackets = false;

                // remove old entry in source table and add new one

                if ((status = sources.DeleteOwnSSRC()) < 0)
                {
                    delete rawpack;
                    return status;
                }
                if ((status = sources.CreateOwnSSRC(newssrc)) < 0)
                {
                    delete rawpack;
                    return status;
                }
            }
        }
        delete rawpack;
    }

    RTPTime d = rtcpsched.CalculateDeterministicInterval(false);

    RTPTime t = RTPTime::CurrentTime();
    double Td = d.GetDouble();
    RTPTime sendertimeout = RTPTime(Td * sendermultiplier);
    RTPTime generaltimeout = RTPTime(Td * membermultiplier);
    RTPTime byetimeout = RTPTime(Td * byemultiplier);
    RTPTime colltimeout = RTPTime(Td * collisionmultiplier);
    RTPTime notetimeout = RTPTime(Td * notemultiplier);

    sources.MultipleTimeouts(t, sendertimeout, byetimeout, generaltimeout, notetimeout);
    collisionlist.Timeout(t, colltimeout);

    // We'll check if it's time for RTCP stuff

    bool istime = rtcpsched.IsTime();

    if (istime)
    {
        RTCPCompoundPacket *pack;

        // we'll check if there's a bye packet to send, or just a normal packet

        if (byepackets.empty())
        {
            if ((status = rtcpbuilder.BuildNextPacket(&pack)) < 0)
            {
                return status;
            }
            if ((status = SendRTCPData(pack->GetCompoundPacketData(), pack->GetCompoundPacketLength())) < 0)
            {
                delete pack;
                return status;
            }

            sentpackets = true;

            OnSendRTCPCompoundPacket(pack); // we'll place this after the actual send to avoid tampering
        }
        else
        {
            pack = *(byepackets.begin());
            byepackets.pop_front();

            if ((status = SendRTCPData(pack->GetCompoundPacketData(), pack->GetCompoundPacketLength())) < 0)
            {
                delete pack;
                return status;
            }

            sentpackets = true;

            OnSendRTCPCompoundPacket(pack); // we'll place this after the actual send to avoid tampering

            if (!byepackets.empty()) // more bye packets to send, schedule them
            {
                rtcpsched.ScheduleBYEPacket((*(byepackets.begin()))->GetCompoundPacketLength());
            }
        }

        rtcpsched.AnalyseOutgoing(*pack);

        delete pack;
    }
    return 0;
}

int RTPSession::CreateCNAME(uint8_t *buffer, std::size_t *bufferlength, bool resolve __attribute__((unused)))
{
    buffer[*bufferlength - 1] = 0;

    std::size_t offset = strlen((const char *) buffer);
    if (offset < (*bufferlength - 1))
        buffer[offset] = (uint8_t) '@';
    offset++;

    std::size_t buflen2 = *bufferlength - offset;

    QString hostnameStr = QHostInfo::localHostName();
    int hostnameSize = hostnameStr.size();

    strncpy((char * )(buffer + offset), hostnameStr.toStdString().c_str(), buflen2);
    *bufferlength = offset + hostnameSize;

    if (*bufferlength > RTCP_SDES_MAXITEMLENGTH)
        *bufferlength = RTCP_SDES_MAXITEMLENGTH;

    return 0;
}

RTPRandom *RTPSession::GetRandomNumberGenerator(RTPRandom *r)
{
    RTPRandom *rnew = 0;

    if (r == 0)
    {
        rnew = RTPRandom::CreateDefaultRandomNumberGenerator();
        deletertprnd = true;
    }
    else
    {
        rnew = r;
        deletertprnd = false;
    }

    return rnew;
}

int RTPSession::SendRTPData(const void *data, std::size_t len)
{
    if (!m_changeOutgoingData)
        return rtptrans->SendRTPData(data, len);

    void *pSendData = 0;
    std::size_t sendLen = 0;
    int status = 0;

    status = OnChangeRTPOrRTCPData(data, len, true, &pSendData, &sendLen);
    if (status < 0)
        return status;

    if (pSendData)
    {
        status = rtptrans->SendRTPData(pSendData, sendLen);
        OnSentRTPOrRTCPData(pSendData, sendLen, true);
    }

    return status;
}

int RTPSession::SendRTCPData(const void *data, std::size_t len)
{
    if (!m_changeOutgoingData)
        return rtptrans->SendRTCPData(data, len);

    void *pSendData = 0;
    std::size_t sendLen = 0;
    int status = 0;

    status = OnChangeRTPOrRTCPData(data, len, false, &pSendData, &sendLen);
    if (status < 0)
        return status;

    if (pSendData)
    {
        status = rtptrans->SendRTCPData(pSendData, sendLen);
        OnSentRTPOrRTCPData(pSendData, sendLen, false);
    }

    return status;
}

} // end namespace