eye_openness_data.c

#include <stdio.h>
#include <string.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 eye_openness_callback(TobiiResearchEyeOpennessData* gaze_data, void* user_data) {
    memcpy(user_data, gaze_data, sizeof(*gaze_data));
}
 
void eye_openness_example(TobiiResearchEyeTracker* eyetracker) {
    char* serial_number = NULL;
    tobii_research_get_serial_number(eyetracker, &serial_number);
    TobiiResearchEyeOpennessData gaze_data;
 
    TobiiResearchStatus status = tobii_research_subscribe_to_eye_openness(eyetracker, &eye_openness_callback, &gaze_data);
    /* Wait while some eye openness data is collected. */
    sleep_ms(2000);
    if (status != TOBII_RESEARCH_STATUS_OK) {
        printf("Failed subscribing to eye openess with error:%d\n", (int)status);
        return;
    }
 
    status = tobii_research_unsubscribe_from_eye_openness(eyetracker, &eye_openness_callback);
    if (status != TOBII_RESEARCH_STATUS_OK) {
        printf("Failed unsubscribing to eye openess with error:%d\n", (int)status);
        return;
    }
 
    printf(
        "Eye openness example data \n"
        "System timestamp: %"PRId64"\n"
        "Tracker timestamp: %"PRId64"\n"
        "left validity: \t%d\n"
        "right validity: %d\n"
        "left value: \t%.0f \tmm\n"
        "right value: \t%.0f \tmm\n",
        gaze_data.system_time_stamp, gaze_data.device_time_stamp,
        gaze_data.left_eye_validity, gaze_data.right_eye_validity,
        gaze_data.left_eye_openness_value, gaze_data.right_eye_openness_value
    );
    /* Wait while some eye openness data is collected. */
    sleep_ms(2000);
}