sdrangel/qrtplib/rtpexternaltransmitter.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 "rtpexternaltransmitter.h"
#include "rtprawpacket.h"
#include "rtptimeutilities.h"
#include "rtpdefines.h"
#include "rtperrors.h"
#include "rtpsocketutilinternal.h"
#include "rtpselect.h"
#include <stdio.h>
#include <string.h>

#include <iostream>

namespace qrtplib
{

RTPExternalTransmitter::RTPExternalTransmitter() :
        packetinjector((RTPExternalTransmitter *) this)
{
    created = false;
    init = false;
}

RTPExternalTransmitter::~RTPExternalTransmitter()
{
    Destroy();
}

int RTPExternalTransmitter::Init(bool tsafe)
{
    if (init)
        return ERR_RTP_EXTERNALTRANS_ALREADYINIT;

    if (tsafe)
        return ERR_RTP_NOTHREADSUPPORT;

    init = true;
    return 0;
}

int RTPExternalTransmitter::Create(std::size_t maximumpacketsize, const RTPTransmissionParams *transparams)
{
    const RTPExternalTransmissionParams *params;
    int status;

    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (created)
    {
        return ERR_RTP_EXTERNALTRANS_ALREADYCREATED;
    }

    // Obtain transmission parameters

    if (transparams == 0)
    {
        return ERR_RTP_EXTERNALTRANS_ILLEGALPARAMETERS;
    }
    if (transparams->GetTransmissionProtocol() != RTPTransmitter::ExternalProto)
    {
        return ERR_RTP_EXTERNALTRANS_ILLEGALPARAMETERS;
    }

    params = (const RTPExternalTransmissionParams *) transparams;

    if ((status = m_abortDesc.Init()) < 0)
    {
        return status;
    }
    m_abortCount = 0;

    maxpacksize = maximumpacketsize;
    sender = params->GetSender();
    headersize = params->GetAdditionalHeaderSize();

    localhostname = 0;
    localhostnamelength = 0;

    waitingfordata = false;
    created = true;
    return 0;
}

void RTPExternalTransmitter::Destroy()
{
    if (!init)
        return;

    if (!created)
    {
        return;
    }

    if (localhostname)
    {
        delete[] localhostname;
        localhostname = 0;
        localhostnamelength = 0;
    }

    FlushPackets();
    created = false;

    if (waitingfordata)
    {
        m_abortDesc.SendAbortSignal();
        m_abortCount++;
        m_abortDesc.Destroy();
        // to make sure that the WaitForIncomingData function ended

    }
    else
        m_abortDesc.Destroy();

}

RTPTransmissionInfo *RTPExternalTransmitter::GetTransmissionInfo()
{
    if (!init)
        return 0;

    RTPTransmissionInfo *tinf = new RTPExternalTransmissionInfo(&packetinjector);
    return tinf;
}

void RTPExternalTransmitter::DeleteTransmissionInfo(RTPTransmissionInfo *i)
{
    if (!init)
        return;

    delete i;
}

int RTPExternalTransmitter::GetLocalHostName(uint8_t *buffer, std::size_t *bufferlength)
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }

    if (localhostname == 0)
    {
// We'll just use 'gethostname' for simplicity

        char name[1024];

        if (gethostname(name, 1023) != 0)
            strcpy(name, "localhost"); // failsafe
        else
            name[1023] = 0; // ensure null-termination

        localhostnamelength = strlen(name);
        localhostname = new uint8_t[localhostnamelength + 1];

        memcpy(localhostname, name, localhostnamelength);
        localhostname[localhostnamelength] = 0;
    }

    if ((*bufferlength) < localhostnamelength)
    {
        *bufferlength = localhostnamelength; // tell the application the required size of the buffer
        return ERR_RTP_TRANS_BUFFERLENGTHTOOSMALL;
    }

    memcpy(buffer, localhostname, localhostnamelength);
    *bufferlength = localhostnamelength;

    return 0;
}

bool RTPExternalTransmitter::ComesFromThisTransmitter(const RTPAddress *addr)
{

    bool value = false;
    if (sender)
        value = sender->ComesFromThisSender(addr);
    return value;
}

int RTPExternalTransmitter::Poll()
{
    return 0;
}

int RTPExternalTransmitter::WaitForIncomingData(const RTPTime &delay, bool *dataavailable)
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }
    if (waitingfordata)
    {
        return ERR_RTP_EXTERNALTRANS_ALREADYWAITING;
    }

    waitingfordata = true;

    if (!rawpacketlist.empty())
    {
        if (dataavailable != 0)
            *dataavailable = true;
        waitingfordata = false;
        return 0;
    }

    int8_t isset = 0;
    SocketType abortSock = m_abortDesc.GetAbortSocket();
    int status = RTPSelect(&abortSock, &isset, 1, delay);
    if (status < 0)
    {

        waitingfordata = false;

        return status;
    }

    waitingfordata = false;
    if (!created) // destroy called
    {

        return 0;
    }

    // if aborted, read from abort buffer
    if (isset)
    {
        m_abortDesc.ClearAbortSignal();
        m_abortCount = 0;
    }

    if (dataavailable != 0)
    {
        if (rawpacketlist.empty())
            *dataavailable = false;
        else
            *dataavailable = true;
    }

    return 0;
}

int RTPExternalTransmitter::AbortWait()
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }
    if (!waitingfordata)
    {
        return ERR_RTP_EXTERNALTRANS_NOTWAITING;
    }

    m_abortDesc.SendAbortSignal();
    m_abortCount++;

    return 0;
}

int RTPExternalTransmitter::SendRTPData(const void *data, std::size_t len)
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }
    if (len > maxpacksize)
    {
        return ERR_RTP_EXTERNALTRANS_SPECIFIEDSIZETOOBIG;
    }

    if (!sender)
    {
        return ERR_RTP_EXTERNALTRANS_NOSENDER;
    }

    if (!sender->SendRTP(data, len))
        return ERR_RTP_EXTERNALTRANS_SENDERROR;

    return 0;
}

int RTPExternalTransmitter::SendRTCPData(const void *data, std::size_t len)
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }
    if (len > maxpacksize)
    {
        return ERR_RTP_EXTERNALTRANS_SPECIFIEDSIZETOOBIG;
    }

    if (!sender)
    {
        return ERR_RTP_EXTERNALTRANS_NOSENDER;
    }

    if (!sender->SendRTCP(data, len))
        return ERR_RTP_EXTERNALTRANS_SENDERROR;

    return 0;
}

int RTPExternalTransmitter::AddDestination(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NODESTINATIONSSUPPORTED;
}

int RTPExternalTransmitter::DeleteDestination(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NODESTINATIONSSUPPORTED;
}

void RTPExternalTransmitter::ClearDestinations()
{
}

bool RTPExternalTransmitter::SupportsMulticasting()
{
    return false;
}

int RTPExternalTransmitter::JoinMulticastGroup(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NOMULTICASTSUPPORT;
}

int RTPExternalTransmitter::LeaveMulticastGroup(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NOMULTICASTSUPPORT;
}

void RTPExternalTransmitter::LeaveAllMulticastGroups()
{
}

int RTPExternalTransmitter::SetReceiveMode(RTPTransmitter::ReceiveMode m)
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }
    if (m != RTPTransmitter::AcceptAll)
    {
        return ERR_RTP_EXTERNALTRANS_BADRECEIVEMODE;
    }
    return 0;
}

int RTPExternalTransmitter::AddToIgnoreList(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NOIGNORELIST;
}

int RTPExternalTransmitter::DeleteFromIgnoreList(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NOIGNORELIST;
}

void RTPExternalTransmitter::ClearIgnoreList()
{
}

int RTPExternalTransmitter::AddToAcceptList(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NOACCEPTLIST;
}

int RTPExternalTransmitter::DeleteFromAcceptList(const RTPAddress &)
{
    return ERR_RTP_EXTERNALTRANS_NOACCEPTLIST;
}

void RTPExternalTransmitter::ClearAcceptList()
{
}

int RTPExternalTransmitter::SetMaximumPacketSize(std::size_t s)
{
    if (!init)
        return ERR_RTP_EXTERNALTRANS_NOTINIT;

    if (!created)
    {
        return ERR_RTP_EXTERNALTRANS_NOTCREATED;
    }
    maxpacksize = s;
    return 0;
}

bool RTPExternalTransmitter::NewDataAvailable()
{
    if (!init)
        return false;

    bool v;

    if (!created)
        v = false;
    else
    {
        if (rawpacketlist.empty())
            v = false;
        else
            v = true;
    }

    return v;
}

RTPRawPacket *RTPExternalTransmitter::GetNextPacket()
{
    if (!init)
        return 0;

    RTPRawPacket *p;

    if (!created)
    {
        return 0;
    }
    if (rawpacketlist.empty())
    {
        return 0;
    }

    p = *(rawpacketlist.begin());
    rawpacketlist.pop_front();

    return p;
}

// Here the private functions start...

void RTPExternalTransmitter::FlushPackets()
{
    std::list<RTPRawPacket*>::const_iterator it;

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

void RTPExternalTransmitter::InjectRTP(const void *data, std::size_t len, const RTPAddress &a)
{
    if (!init)
        return;

    if (!created)
    {
        return;
    }

    RTPAddress *addr = a.CreateCopy();
    if (addr == 0)
        return;

    uint8_t *datacopy;

    datacopy = new uint8_t[len];
    if (datacopy == 0)
    {
        delete addr;
        return;
    }
    memcpy(datacopy, data, len);

    RTPTime curtime = RTPTime::CurrentTime();
    RTPRawPacket *pack;

    pack = new RTPRawPacket(datacopy, len, addr, curtime, true);
    if (pack == 0)
    {
        delete addr;
        delete[] localhostname;
        return;
    }
    rawpacketlist.push_back(pack);

    if (m_abortCount == 0)
    {
        m_abortDesc.SendAbortSignal();
        m_abortCount++;
    }

}

void RTPExternalTransmitter::InjectRTCP(const void *data, std::size_t len, const RTPAddress &a)
{
    if (!init)
        return;

    if (!created)
    {
        return;
    }

    RTPAddress *addr = a.CreateCopy();
    if (addr == 0)
        return;

    uint8_t *datacopy;

    datacopy = new uint8_t[len];
    if (datacopy == 0)
    {
        delete addr;
        return;
    }
    memcpy(datacopy, data, len);

    RTPTime curtime = RTPTime::CurrentTime();
    RTPRawPacket *pack;

    pack = new RTPRawPacket(datacopy, len, addr, curtime, false);
    if (pack == 0)
    {
        delete addr;
        delete[] localhostname;
        return;
    }
    rawpacketlist.push_back(pack);

    if (m_abortCount == 0)
    {
        m_abortDesc.SendAbortSignal();
        m_abortCount++;
    }

}

void RTPExternalTransmitter::InjectRTPorRTCP(const void *data, std::size_t len, const RTPAddress &a)
{
    if (!init)
        return;

    if (!created)
    {
        return;
    }

    RTPAddress *addr = a.CreateCopy();
    if (addr == 0)
        return;

    uint8_t *datacopy;
    bool rtp = true;

    if (len >= 2)
    {
        const uint8_t *pData = (const uint8_t *) data;
        if (pData[1] >= 200 && pData[1] <= 204)
            rtp = false;
    }

    datacopy = new uint8_t[len];
    if (datacopy == 0)
    {
        delete addr;
        return;
    }
    memcpy(datacopy, data, len);

    RTPTime curtime = RTPTime::CurrentTime();
    RTPRawPacket *pack;

    pack = new RTPRawPacket(datacopy, len, addr, curtime, rtp);
    if (pack == 0)
    {
        delete addr;
        delete[] localhostname;
        return;
    }
    rawpacketlist.push_back(pack);

    if (m_abortCount == 0)
    {
        m_abortDesc.SendAbortSignal();
        m_abortCount++;
    }

}

} // end namespace