C API minimal examples¶

#include <stdio.h>
#include <stdlib.h>

#include "plumerai/video_intelligence_c.h"

int main(void) {
  // Settings, to be changed as needed
  const int width = 1600;   // camera image width in pixels
  const int height = 1200;  // camera image height in pixels

  // Initialize the video intelligence algorithm
  CPlumeraiVideoIntelligence pvi =
      plumerai_video_intelligence_create(height, width);

  // Pre-allocate space for the input image (*3 for RGB)
  unsigned char *image = (unsigned char *)malloc(height * width * 3);

  // Loop over frames in a video stream (example: 10 times)
  for (int t = 0; t < 10; ++t) {
    // Some example input here, normally this is where camera data is acquired
    image[0] = 12;
    image[1] = 143;
    // etc...

    // The time between two video frames in seconds
    // In this example we assume a constant frame rate of 30 fps, but variable
    // rates are supported.
    const float delta_t = 1.f / 30.f;

    // Process the frame
    PlumeraiErrorCode error_code =
        plumerai_video_intelligence_process_frame_packed_rgb888(pvi, image,
                                                                delta_t);
    if (error_code != PLUMERAI_SUCCESS) {
      printf("Error: %s\n", plumerai_error_code_string(error_code));
      return 1;
    }

    const BoxPrediction *predictions = NULL;
    size_t num_results = 0;
    error_code = plumerai_object_detection_get_detections(pvi, &predictions,
                                                          &num_results);
    if (error_code != PLUMERAI_SUCCESS) {
      printf("Error: %s\n", plumerai_error_code_string(error_code));
      return 1;
    }

    // Display the results to stdout
    for (size_t i = 0; i < num_results; ++i) {
      BoxPrediction p = predictions[i];
      printf("Box #%d of class %d @ (x,y) -> (%.2f,%.2f) till (%.2f,%.2f)\n",
             p.id, p.class_id, p.x_min, p.y_min, p.x_max, p.y_max);
    }
    if (num_results == 0) {
      printf("No bounding boxes found in frame\n");
    }
  }

  // Clean-up
  free(image);
  plumerai_video_intelligence_destroy(pvi);
  return 0;
}