sdr.c

// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// sdr.c: generic SDR infrastructure
//
// Copyright (c) 2016-2017 Oliver Jowett <oliver@mutability.co.uk>
// Copyright (c) 2017 FlightAware LLC
//
// This file is free software: you may copy, redistribute and/or modify it  
// under the terms of the GNU General Public License as published by the
// Free Software Foundation, either version 2 of the License, or (at your  
// option) any later version.  
//
// This file is distributed in the hope that it will be useful, but  
// WITHOUT ANY WARRANTY; without even the implied warranty of  
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License  
// along with this program.  If not, see <http:https://www.gnu.org/licenses/>.

#include "dump1090.h"

#include "sdr_ifile.h"
#ifdef ENABLE_RTLSDR
#  include "sdr_rtlsdr.h"
#endif
#ifdef ENABLE_BLADERF
#  include "sdr_bladerf.h"
#endif

typedef struct {
    void (*initConfig)();
    void (*showHelp)();
    bool (*handleOption)(int, char**, int*);
    bool (*open)();
    void (*run)();
    void (*close)();
    const char *name;
    sdr_type_t sdr_type;
    uint32_t padding;
} sdr_handler;

static void noInitConfig()
{
}

static void noShowHelp()
{
}

static bool noHandleOption(int argc, char **argv, int *jptr)
{
    MODES_NOTUSED(argc);
    MODES_NOTUSED(argv);
    MODES_NOTUSED(jptr);

    return false;
}

static bool noOpen()
{
    fprintf(stderr, "Net-only mode, no SDR device or file open.\n");
    return true;
}

static void noRun()
{
}

static void noClose()
{
}

static bool unsupportedOpen()
{
    fprintf(stderr, "Support for this SDR type was not enabled in this build.\n");
    return false;
}

static sdr_handler sdr_handlers[] = {
#ifdef ENABLE_RTLSDR
    {  rtlsdrInitConfig, rtlsdrShowHelp,  rtlsdrHandleOption, rtlsdrOpen, rtlsdrRun, rtlsdrClose, "rtlsdr", SDR_RTLSDR, 0 },
#endif

#ifdef ENABLE_BLADERF
    {  bladeRFInitConfig, bladeRFShowHelp,  bladeRFHandleOption, bladeRFOpen, bladeRFRun, bladeRFClose, "bladerf", SDR_BLADERF, 0 },
#endif

    {  ifileInitConfig, ifileShowHelp, ifileHandleOption, ifileOpen, ifileRun, ifileClose, "ifile", SDR_IFILE, 0 },
    {  noInitConfig, noShowHelp,  noHandleOption, noOpen, noRun, noClose, "none", SDR_NONE, 0 },

    {  NULL, NULL, NULL, NULL, NULL, NULL, NULL, SDR_NONE, 0 } /* must come last */
};

void sdrInitConfig()
{
    // Default SDR is the first type available in the handlers array.
    Modes.sdr_type = sdr_handlers[0].sdr_type;

    for (int i = 0; sdr_handlers[i].name; ++i) {
        sdr_handlers[i].initConfig();
    }
}

void sdrShowHelp()
{
    printf("--device-type <type>     Select SDR type (default: %s)\n", sdr_handlers[0].name);
    printf("\n");

    for (int i = 0; sdr_handlers[i].name; ++i) {
        sdr_handlers[i].showHelp();
    }
}

bool sdrHandleOption(int argc, char **argv, int *jptr)
{
    int j = *jptr;
    if (!strcmp(argv[j], "--device-type") && (j+1) < argc) {
        ++j;
        for (int i = 0; sdr_handlers[i].name; ++i) {
            if (!strcasecmp(sdr_handlers[i].name, argv[j])) {
                Modes.sdr_type = sdr_handlers[i].sdr_type;
                *jptr = j;
                return true;
            }
        }

        fprintf(stderr, "SDR type '%s' not recognized; supported SDR types are:\n", argv[j]);
        for (int i = 0; sdr_handlers[i].name; ++i) {
            fprintf(stderr, "  %s\n", sdr_handlers[i].name);
        }

        return false;
    }

    for (int i = 0; sdr_handlers[i].name; ++i) {
        if (sdr_handlers[i].handleOption(argc, argv, jptr))
            return true;
    }

    return false;
}

static sdr_handler *current_handler()
{
    static sdr_handler unsupported_handler = {  noInitConfig, noShowHelp, noHandleOption, unsupportedOpen, noRun, noClose, "unsupported", SDR_NONE, 0 };

    for (int i = 0; sdr_handlers[i].name; ++i) {
        if (Modes.sdr_type == sdr_handlers[i].sdr_type) {
            return &sdr_handlers[i];
        }
    }

    return &unsupported_handler;
}

bool sdrOpen()
{
    return current_handler()->open();
}

void sdrRun()
{
    return current_handler()->run();
}

void sdrClose()
{
    current_handler()->close();
}