time_synchronization_data.c

#include <stdio.h>
#include <inttypes.h>
#include "tobii_research_eyetracker.h"
#include "tobii_research_streams.h"

#if _WIN32 || _WIN64
#include <windows.h>
static void sleep_ms(int time) {
    Sleep(time);
}
#else
#include <unistd.h>
static void sleep_ms(int time) {
    usleep(time * 1000);
}
#endif


void time_synchronization_data_callback(TobiiResearchTimeSynchronizationData* time_synchronization_data,
        void* user_data){
        (void)(user_data);  // Is NULL, see subscribing call
        printf("Device time stamp: %" PRId64 "\n", time_synchronization_data->device_time_stamp);
        printf("System request time stamp: %" PRId64 "\n", time_synchronization_data->system_request_time_stamp);
        printf("System response time stamp: %" PRId64 "\n", time_synchronization_data->system_response_time_stamp);
}


void time_synchronization_data_example(TobiiResearchEyeTracker* eyetracker) {

    char* serial_number;
    tobii_research_get_serial_number(eyetracker, &serial_number);

    printf("Subscribing to time synchronization data for eye tracker with serial number %s.\n", serial_number);

    tobii_research_free_string(serial_number);

    tobii_research_subscribe_to_time_synchronization_data(eyetracker, time_synchronization_data_callback, NULL);

    /* Wait while some time synchronization data is collected. */
    sleep_ms(2000);

    tobii_research_unsubscribe_from_time_synchronization_data(eyetracker, time_synchronization_data_callback);
    printf("Unsubscribed from time synchronization data.\n");
}