DVBFrontendHandle.cc

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//
// Copyright (c) 2020 Fraunhofer Institute for Applied Information Technology (FIT)
//                    Network Research Group (NET)
//                    Schloss Birlinghoven, 53754 Sankt Augustin, GERMANY
//                    Contact: support@wiback.org
//
// This file is part of the SENF code tree.
// It is licensed under the 3-clause BSD License (aka New BSD License).
// See LICENSE.txt in the top level directory for details or visit
// https://opensource.org/licenses/BSD-3-Clause
//


#include "DVBFrontendHandle.hh"
//#include "DVBFrontendHandle.ih"

// Custom includes
#include <boost/format.hpp>
#include <sys/socket.h>
#include <senf/Utils/Exception.hh>
#include <sys/ioctl.h>


//#include "DVBFrontendHandle.mpp"
#define prefix_
//-/////////////////////////////////////////////////////////////////////////////////////////////////

//-/////////////////////////////////////////////////////////////////////////////////////////////////
// senf::DVBFrontendHandle
using namespace std;

prefix_ void senf::DVBFrontendSocketProtocol::init_client(unsigned short adapter, unsigned short device, int flags)
    const
{
    string devFrontend = str( boost::format("/dev/dvb/adapter%d/frontend%d") % adapter % device);
    int f = open(devFrontend.c_str(), flags);
    if (f < 0)
        SENF_THROW_SYSTEM_EXCEPTION("Could not open frontend device of DVB adapter ") << devFrontend << ".";
    fd(f);
}

prefix_ unsigned senf::DVBFrontendSocketProtocol::available()
    const
{
    return 0;
}

prefix_ bool senf::DVBFrontendSocketProtocol::eof()
    const
{
    return false;
}

prefix_ void senf::DVBFrontendSocketProtocol::tune(const struct dvb_frontend_parameters & frontend)
    const
{
    // tuning
    if (::ioctl(fd(), FE_SET_FRONTEND, &frontend) )
        SENF_THROW_SYSTEM_EXCEPTION("ioctl FE_SET_FRONTEND failed. Socket should initialized with r/w permissions.");
}

prefix_ void senf::DVBFrontendSocketProtocol::tuneDVB_T(unsigned int frequency,
        fe_spectral_inversion_t inversion,
        fe_bandwidth_t bandwidth,
        fe_code_rate_t code_rate_HP, /* high priority stream code rate */
        fe_code_rate_t code_rate_LP, /* low priority stream code rate */
        fe_modulation_t constellation, /* modulation type */
        fe_transmit_mode_t transmission_mode,
        fe_guard_interval_t guard_interval,
        fe_hierarchy_t hierarchy_information
        )
    const
{
    struct dvb_ofdm_parameters ofdm; /* DVB-T Parameters */
    struct dvb_frontend_parameters frontend;

    ::memset(&frontend, 0, sizeof(struct dvb_frontend_parameters));
    ::memset(&ofdm, 0, sizeof(struct dvb_ofdm_parameters));

    ofdm.bandwidth = bandwidth;
    ofdm.code_rate_HP = code_rate_HP;
    ofdm.code_rate_LP = code_rate_LP;
    ofdm.constellation = constellation;
    ofdm.guard_interval = guard_interval;
    ofdm.hierarchy_information = hierarchy_information;

    frontend.frequency = frequency;
    frontend.inversion = inversion;
    frontend.u.ofdm = ofdm;

    tune(frontend);

}
prefix_ void senf::DVBFrontendSocketProtocol::tuneDVB_S(unsigned int frequency,
        fe_spectral_inversion_t inversion,
        unsigned int symbole_rate, /* symbol rate in Symbols per second */
        fe_code_rate_t fec_inner /* forward error correction (see above) */
    )
    const
{
    struct dvb_qpsk_parameters qpsk; /* DVB-S Parameters*/
    struct dvb_frontend_parameters frontend;

    ::memset(&frontend, 0, sizeof(struct dvb_frontend_parameters));
    ::memset(&qpsk, 0, sizeof(struct dvb_qpsk_parameters));

    qpsk.symbol_rate = symbole_rate;
    qpsk.fec_inner = fec_inner;

    frontend.frequency = frequency;
    frontend.inversion = inversion;
    frontend.u.qpsk = qpsk;

    tune(frontend);
}

prefix_ void senf::DVBFrontendSocketProtocol::tuneDVB_C(unsigned int frequency,
        fe_spectral_inversion_t inversion,
        unsigned int symbol_rate,
        fe_code_rate_t fec_inner,
        fe_modulation_t modulation
        )
const
{
    struct dvb_qam_parameters qam; /* DVB-C Parameters*/
    struct dvb_frontend_parameters frontend;

    ::memset(&frontend, 0, sizeof(struct dvb_frontend_parameters));
    ::memset(&qam, 0, sizeof(struct dvb_qam_parameters));

    qam.symbol_rate = symbol_rate;
    qam.fec_inner = fec_inner;
    qam.modulation = modulation;


    frontend.frequency = frequency;
    frontend.inversion = inversion;
    frontend.u.qam = qam;

    tune(frontend);
}
prefix_ void senf::DVBFrontendSocketProtocol::setNonBlock(bool on)
    const
{
   if (on)
       ::fcntl(fd(), F_SETFL, ::fcntl(fd(), F_GETFL) | O_NONBLOCK);
   else
       ::fcntl(fd(), F_SETFL, ::fcntl(fd(), F_GETFL) & ~O_NONBLOCK);

}
prefix_ dvb_frontend_info senf::DVBFrontendSocketProtocol::getInfo()
    const
{
    struct dvb_frontend_info info;
    ::memset(&info, 0, sizeof(struct dvb_frontend_info));

    if (::ioctl(fd(), FE_GET_INFO, &info)) {
        SENF_THROW_SYSTEM_EXCEPTION("Could not read on fildescriptor.");
    }
    return info;
}

prefix_ dvb_frontend_parameters senf::DVBFrontendSocketProtocol::getFrontendParam() const {
    struct dvb_frontend_parameters frontend_;

    ::memset(&frontend_, 0, sizeof(struct dvb_frontend_parameters));

    if (::ioctl(fd(), FE_GET_FRONTEND, &frontend_)) {
        switch(errno) {
            case EBADF:
                SENF_THROW_SYSTEM_EXCEPTION("fd is not a valid open file descriptor.");
                break;
            case EFAULT:
                SENF_THROW_SYSTEM_EXCEPTION( "frontend_ points to invalid address." );
                break;
            case EINVAL:
                SENF_THROW_SYSTEM_EXCEPTION( "Maximum supported symbol rate reached. This call may not be implemented by kernel driver!" );
                break;
            default:
                SENF_THROW_SYSTEM_EXCEPTION("Errno: ") << errno;
        }
    }
    return frontend_;
}

prefix_ dvb_frontend_event senf::DVBFrontendSocketProtocol::getEvent() const{
    struct dvb_frontend_event ev ;

    ::memset(&ev, 0, sizeof(struct dvb_frontend_event));
    if (::ioctl(fd(), FE_GET_EVENT, &ev)) {
        switch(errno) {
            case EBADF:
                SENF_THROW_SYSTEM_EXCEPTION("Could not read from frontend device, read-only access to the device is sufficient.");
                break;
            case EWOULDBLOCK:
                SENF_THROW_SYSTEM_EXCEPTION( "No event pending and device is in nonblocking mode." );
                break;
            case EINTR:
                // TODO: ignore EINTR. which might be caused by watchdog signals. This is possibly not the solution, but should work
                break;
            default:
                SENF_THROW_SYSTEM_EXCEPTION("Errno: ") << errno;
        }
    }
    return ev;
}

prefix_ int16_t senf::DVBFrontendSocketProtocol::signalStrength()
    const
{
    int16_t strength;
    if (::ioctl(fd(), FE_READ_SIGNAL_STRENGTH, &strength) < 0)
        SENF_THROW_SYSTEM_EXCEPTION("Could not get signal strength of DVB adapter.");
    return strength;
}

prefix_ int16_t senf::DVBFrontendSocketProtocol::signalNoiseRatio()
    const
{
    int16_t snr;
    if (::ioctl(fd(), FE_READ_SNR, &snr) < 0)
        SENF_THROW_SYSTEM_EXCEPTION("Could not get signal-to-noise ratio of DVB adapter.");
    return snr;
}

prefix_ uint32_t senf::DVBFrontendSocketProtocol::bitErrorRate()
    const
{
    uint32_t ber;
    if (::ioctl(fd(), FE_READ_BER, &ber) < 0)
        SENF_THROW_SYSTEM_EXCEPTION("Could not get bit error rate of DVB adapter.");
    return ber;
}

prefix_ uint32_t senf::DVBFrontendSocketProtocol::uncorrectedBlocks()
    const
{
    uint32_t uncorrected_blocks;
    if (::ioctl(fd(), FE_READ_UNCORRECTED_BLOCKS, &uncorrected_blocks) < 0)
        SENF_THROW_SYSTEM_EXCEPTION("Could not get bit error rate of DVB adapter.");
    return uncorrected_blocks;
}


prefix_ fe_status_t senf::DVBFrontendSocketProtocol::status()
    const
{
    fe_status_t status;
    if (::ioctl(fd(), FE_READ_STATUS, &status) < 0)
        SENF_THROW_SYSTEM_EXCEPTION("Could not get bit error rate of DVB adapter.");
    return status;
}


//-/////////////////////////////////////////////////////////////////////////////////////////////////
#undef prefix_
//#include "DVBFrontendHandle.mpp"


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// ispell-local-dictionary: "american"
// compile-command: "scons -u test"
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