dump1090/stats.c

// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// stats.c: statistics helpers.
//
// Copyright (c) 2015 Oliver Jowett <oliver@mutability.co.uk>
//
// 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://www.gnu.org/licenses/>.

// This file incorporates work covered by the following copyright and  
// permission notice:
//
//   Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
//   All rights reserved.
//
//   Redistribution and use in source and binary forms, with or without
//   modification, are permitted provided that the following conditions are
//   met:
//
//    *  Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//
//    *  Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
//   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
//   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
//   HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
//   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
//   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
//   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
//   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
//   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
//   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "dump1090.h"

void add_timespecs(const struct timespec *x, const struct timespec *y, struct timespec *z)
{
    z->tv_sec = x->tv_sec + y->tv_sec;
    z->tv_nsec = x->tv_nsec + y->tv_nsec;
    z->tv_sec += z->tv_nsec / 1000000000L;
    z->tv_nsec = z->tv_nsec % 1000000000L;
}

void display_stats(struct stats *st) {
    int j;
    struct tm tm_start, tm_end;
    char tb_start[30], tb_end[30];

    printf("\n\n");
    if (Modes.interactive)
        interactiveShowData();

    localtime_r(&st->start, &tm_start);
    strftime(tb_start, sizeof(tb_start), "%c", &tm_start);
    localtime_r(&st->end, &tm_end);
    strftime(tb_end, sizeof(tb_end), "%c", &tm_end);

    printf("Statistics: %s - %s\n", tb_start, tb_end);

    if (!Modes.net_only) {
        printf("Local receiver:\n");
        printf("  %u sample blocks processed\n",                    st->blocks_processed);
        printf("  %u sample blocks dropped\n",                      st->blocks_dropped);

        printf("  %u Mode A/C messages received\n",                 st->demod_modeac);
        printf("  %u Mode-S message preambles received\n",          st->demod_preambles);
        printf("    %u with bad message format or invalid CRC\n",   st->demod_rejected_bad);
        printf("    %u with unrecognized ICAO address\n",           st->demod_rejected_unknown_icao);
        printf("    %u accepted with correct CRC\n",                st->demod_accepted[0]);
        for (j = 1; j <= Modes.nfix_crc; ++j)
            printf("    %u accepted with %d-bit error repaired\n", st->demod_accepted[j], j);

        if (st->noise_power_count) {
            printf("  %.1f dBFS noise floor\n",
                   10 * log10(st->noise_power_sum / st->noise_power_count));
        }

        if (st->signal_power_count) {
            printf("  %.1f dBFS mean signal power\n",
                   10 * log10(st->signal_power_sum / st->signal_power_count));
        }

        printf("  %.1f dBFS peak signal power\n",
               10 * log10(st->peak_signal_power));

        printf("  %u messages with signal power above -3dBFS\n",
               st->strong_signal_count);
    }

    if (Modes.net) {
        printf("Messages from network clients:\n");
        printf("  %u Mode A/C messages received\n",               st->remote_received_modeac);
        printf("  %u Mode S messages received\n",                 st->remote_received_modes);
        printf("    %u with bad message format or invalid CRC\n", st->remote_rejected_bad);
        printf("    %u with unrecognized ICAO address\n",         st->remote_rejected_unknown_icao);
        printf("    %u accepted with correct CRC\n",              st->remote_accepted[0]);
        for (j = 1; j <= Modes.nfix_crc; ++j)
            printf("    %u accepted with %d-bit error repaired\n", st->remote_accepted[j], j);
    }

    printf("%u total usable messages\n",
           st->messages_total);

    printf("%u global CPR attempts with valid positions\n"
           "%u global CPR attempts with bad data\n"
           "%u global CPR attempts with insufficient data\n"
           "%u local CPR attempts with valid positions\n"
           "%u local CPR attempts with insufficient data\n"
           "%u CPR messages that look like transponder failures filtered\n",
           st->cpr_global_ok,
           st->cpr_global_bad,
           st->cpr_global_skipped,
           st->cpr_local_ok,
           st->cpr_local_skipped,
           st->cpr_filtered);

    if (Modes.net && Modes.net_http_port)
        printf("%d HTTP requests\n", st->http_requests);

    {
        uint64_t demod_cpu_millis = (uint64_t)st->demod_cpu.tv_sec*1000UL + st->demod_cpu.tv_nsec/1000000UL;
        uint64_t reader_cpu_millis = (uint64_t)st->reader_cpu.tv_sec*1000UL + st->reader_cpu.tv_nsec/1000000UL;
        uint64_t background_cpu_millis = (uint64_t)st->background_cpu.tv_sec*1000UL + st->background_cpu.tv_nsec/1000000UL;

        printf("CPU load: %.1f%%\n"
               "  %llu ms for demodulation\n"
               "  %llu ms for reading from USB\n"
               "  %llu ms for network input and background tasks\n",
               0.1 * (demod_cpu_millis + reader_cpu_millis + background_cpu_millis) / (st->end - st->start + 1),
               (unsigned long long) demod_cpu_millis,
               (unsigned long long) reader_cpu_millis,
               (unsigned long long) background_cpu_millis);
    }

    fflush(stdout);
}

void reset_stats(struct stats *st) {
    static struct stats st_zero;
    *st = st_zero;
}

void add_stats(const struct stats *st1, const struct stats *st2, struct stats *target) {
    int i;

    if (st1->start == 0)
        target->start = st2->start;
    else if (st2->start == 0)
        target->start = st1->start;
    else if (st1->start < st2->start)
        target->start = st1->start;
    else
        target->start = st2->start;

    target->end = st1->end > st2->end ? st1->end : st2->end;
    
    target->demod_preambles = st1->demod_preambles + st2->demod_preambles;
    target->demod_rejected_bad = st1->demod_rejected_bad + st2->demod_rejected_bad;
    target->demod_rejected_unknown_icao = st1->demod_rejected_unknown_icao + st2->demod_rejected_unknown_icao;
    for (i = 0; i < MODES_MAX_BITERRORS+1; ++i)
        target->demod_accepted[i]  = st1->demod_accepted[i] + st2->demod_accepted[i];
    target->demod_modeac = st1->demod_modeac + st2->demod_modeac;

    target->blocks_processed = st1->blocks_processed + st2->blocks_processed;
    target->blocks_dropped = st1->blocks_dropped + st2->blocks_dropped;

    add_timespecs(&st1->demod_cpu, &st2->demod_cpu, &target->demod_cpu);
    add_timespecs(&st1->reader_cpu, &st2->reader_cpu, &target->reader_cpu);
    add_timespecs(&st1->background_cpu, &st2->background_cpu, &target->background_cpu);
    
    // noise floor:
    target->noise_power_sum = st1->noise_power_sum + st2->noise_power_sum;
    target->noise_power_count = st1->noise_power_count + st2->noise_power_count;

    // mean signal power:
    target->signal_power_sum = st1->signal_power_sum + st2->signal_power_sum;
    target->signal_power_count = st1->signal_power_count + st2->signal_power_count;

    // peak signal power seen
    if (st1->peak_signal_power > st2->peak_signal_power)
        target->peak_signal_power = st1->peak_signal_power;
    else
        target->peak_signal_power = st2->peak_signal_power;

    // strong signals
    target->strong_signal_count = st1->strong_signal_count + st2->strong_signal_count;

    // remote messages:
    target->remote_received_modeac = st1->remote_received_modeac + st2->remote_received_modeac;
    target->remote_received_modes = st1->remote_received_modes + st2->remote_received_modes;
    target->remote_rejected_bad = st1->remote_rejected_bad + st2->remote_rejected_bad;
    target->remote_rejected_unknown_icao = st1->remote_rejected_unknown_icao + st2->remote_rejected_unknown_icao;
    for (i = 0; i < MODES_MAX_BITERRORS+1; ++i)
        target->remote_accepted[i]  = st1->remote_accepted[i] + st2->remote_accepted[i];

    // total messages:
    target->messages_total = st1->messages_total + st2->messages_total;

    // network:
    target->http_requests = st1->http_requests + st2->http_requests;

    // CPR decoding:
    target->cpr_global_ok = st1->cpr_global_ok + st2->cpr_global_ok;
    target->cpr_global_bad = st1->cpr_global_bad + st2->cpr_global_bad;
    target->cpr_global_skipped = st1->cpr_global_skipped + st2->cpr_global_skipped;
    target->cpr_local_ok = st1->cpr_local_ok + st2->cpr_local_ok;
    target->cpr_local_skipped = st1->cpr_local_skipped + st2->cpr_local_skipped;
    target->cpr_filtered = st1->cpr_filtered + st2->cpr_filtered;
}