eye_images_as_gif.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_image_as_gif_callback(TobiiResearchEyeImageGif* frame, void* user_data) {
    const char* dir_path = (const char*)user_data;
    char img_path[256];
    FILE* fd;
    sprintf(img_path, "%s/eye_image_%" PRId64 ".gif", dir_path, frame->device_time_stamp);
    printf("Received image %s\n", img_path);

    fd = fopen(img_path, "wb");
    fwrite(frame->image_data, frame->image_size, 1, fd);
    fclose(fd);
}

void eye_images_as_gif_example(TobiiResearchEyeTracker* eyetracker, const char* dir_path) {
    /* Subscribe to eye images */
    tobii_research_subscribe_to_eye_image_as_gif(
            eyetracker,
            eye_image_as_gif_callback, (void*)dir_path);

    /* Wait for eye images. */
    sleep_ms(2000);

    /* Unsubscribe to eye images */
    tobii_research_unsubscribe_from_eye_image_as_gif(
            eyetracker,
            eye_image_as_gif_callback);
}