Add kLog camera command.

Change-Id: Ica73c88ca38b1fc5dc505ce61553d16772270644
diff --git a/y2019/vision/image_writer.cc b/y2019/vision/image_writer.cc
new file mode 100644
index 0000000..ac35114
--- /dev/null
+++ b/y2019/vision/image_writer.cc
@@ -0,0 +1,40 @@
+#include <fstream>
+#include <sys/stat.h>
+
+#include "aos/logging/logging.h"
+#include "y2019/vision/image_writer.h"
+
+namespace y2019 {
+namespace vision {
+
+ImageWriter::ImageWriter() {
+  LOG(INFO, "Initializing image writer\n");
+  SetDirPath();
+}
+
+void ImageWriter::WriteImage(::aos::vision::DataRef data) {
+  LOG(INFO, "Writing image %d", image_count_);
+  std::ofstream ofs(
+      dir_path_ + file_prefix_ + std::to_string(image_count_) + ".yuyv",
+      std::ofstream::out);
+  ofs << data;
+  ofs.close();
+  ++image_count_;
+}
+
+void ImageWriter::SetDirPath() {
+  ::std::string base_path = "/jevois/data/run_";
+  for (int i = 0;; ++i) {
+    struct stat st;
+    std::string option = base_path + std::to_string(i);
+    if (stat(option.c_str(), &st) != 0) {
+      file_prefix_ = option + "/";
+      LOG(INFO, "Writing to %s\n", file_prefix_.c_str());
+      mkdir(file_prefix_.c_str(), 0777);
+      break;
+    }
+  }
+}
+
+}  // namespace vision
+}  // namespace y2019