dump1090/sdr.c

#include "dump1090.h"
#include "sdr.h"

#define ENABLE_RTLSDR

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

typedef struct {
    const char *name;
    sdr_type_t sdr_type;
    void (*initConfig)();
    void (*showHelp)();
    bool (*handleOption)(int, char**, int*);
    bool (*open)();
    void (*run)();
    void (*close)();
} 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
    { "rtlsdr", SDR_RTLSDR, rtlsdrInitConfig, rtlsdrShowHelp, rtlsdrHandleOption, rtlsdrOpen, rtlsdrRun, rtlsdrClose },
#endif

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

    { NULL, SDR_NONE, NULL, NULL, NULL, NULL, NULL, NULL } /* 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 = { "unsupported", SDR_NONE, noInitConfig, noShowHelp, noHandleOption, unsupportedOpen, noRun, noClose };

    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();
}