Buffer returns the n slots it has

lib/src/MetadataBuffer.cpp

@@ -76,4 +76,9 @@ shared_ptr<char> MetadataBuffer::get_metadata_values(string name)
 shared_ptr<unordered_map<string, HeaderDataType>> MetadataBuffer::get_header_values_type()
 {
     return header_values_type;
+}
+
+uint64_t MetadataBuffer::get_n_images()
+{
+    return n_images;
 }

lib/src/MetadataBuffer.hpp

@@ -20,6 +20,7 @@ class MetadataBuffer
 		void add_metadata_to_buffer(std::string name, uint64_t frame_index, const char* data);
 		std::shared_ptr<char> get_metadata_values(std::string name);
 		std::shared_ptr<std::unordered_map<std::string, HeaderDataType>> get_header_values_type();
+		uint64_t get_n_images();
 };
 
 #endif