UltraGrid plugin: added a test driver

client/ultragrid/test.cpp

+#ifdef _WIN32
+#include <windows.h>
+#include <io.h>
+#include <signal.h>
+#define usleep(us) Sleep(us / 1000)
+#else
+#include <unistd.h>
+#endif
+#include <cstdio>
+#include <vector>
+
+#include "ultragrid.h"
+
+#define WIDTH 5120
+#define HEIGHT 1440
+#define FPS 30
+
+using std::vector;
+
+bool should_exit = false;
+
+static void signal_handler(int signal) {
+        char msg[] = "Signal caught... Exiting\n";
+        write(2, msg, sizeof msg - 1);
+        should_exit = true;
+}
+
+int main() {
+        vector <unsigned char> buffer(WIDTH * HEIGHT / 2 * 3, 0xff);
+        signal(SIGINT, signal_handler);
+        signal(SIGTERM, signal_handler);
+        while (!should_exit) {
+                cesnet_set_render_buffer_yuv_i420(buffer.data(), buffer.data() + WIDTH * HEIGHT, buffer.data() + WIDTH * HEIGHT / 4, WIDTH, HEIGHT);
+                usleep(1000L * 1000 / FPS);
+        }
+}
+