Function check_keyboard_interaction

fftools/ffmpeg.c:822–882

}

static int check_keyboard_interaction(int64_t cur_time)
{
    int i, key;
    static int64_t last_time;
    /* read_key() returns 0 on EOF */
    if (cur_time - last_time >= 100000) {
        key =  read_key();
        last_time = cur_time;
    }else
        key = -1;
    if (key == 'q') {
        av_log(NULL, AV_LOG_INFO, "\n\n[q] command received. Exiting.\n\n");
        return AVERROR_EXIT;
    }
    if (key == '+') av_log_set_level(av_log_get_level()+10);
    if (key == '-') av_log_set_level(av_log_get_level()-10);
    if (key == 'c' || key == 'C'){
        char buf[4096], target[64], command[256], arg[256] = {0};
        double time;
        int k, n = 0;
        fprintf(stderr, "\nEnter command: <target>|all <time>|-1 <command>[ <argument>]\n");
        i = 0;
        set_tty_echo(1);
        while ((k = read_key()) != '\n' && k != '\r' && i < sizeof(buf)-1)
            if (k > 0)
                buf[i++] = k;
        buf[i] = 0;
        set_tty_echo(0);
        fprintf(stderr, "\n");
        if (k > 0 &&
            (n = sscanf(buf, "%63[^ ] %lf %255[^ ] %255[^\n]", target, &time, command, arg)) >= 3) {
            av_log(NULL, AV_LOG_DEBUG, "Processing command target:%s time:%f command:%s arg:%s",
                   target, time, command, arg);
            for (OutputStream *ost = ost_iter(NULL); ost; ost = ost_iter(ost)) {
                if (ost->fg_simple)
                    fg_send_command(ost->fg_simple, time, target, command, arg,
                                    key == 'C');
            }
            for (i = 0; i < nb_filtergraphs; i++)
                fg_send_command(filtergraphs[i], time, target, command, arg,
                                key == 'C');
        } else {
            av_log(NULL, AV_LOG_ERROR,
                   "Parse error, at least 3 arguments were expected, "
                   "only %d given in string '%s'\n", n, buf);
        }
    }
    if (key == '?'){
        fprintf(stderr, "key    function\n"
                        "?      show this help\n"
                        "+      increase verbosity\n"
                        "-      decrease verbosity\n"
                        "c      Send command to first matching filter supporting it\n"
                        "C      Send/Queue command to all matching filters\n"
                        "h      dump packets/hex press to cycle through the 3 states\n"
                        "q      quit\n"
                        "s      Show QP histogram\n"
        );