doc groups

libs/main/math/pifft.h

@@ -1,6 +1,10 @@
 /*! \file pifft.h
- * \brief Class for FFT, IFFT and Hilbert transformations
-*/
+ * \ingroup Math
+ * \ingroup FFTW
+ * \~\brief
+ * \~english FFT, IFFT and Hilbert transformations
+ * \~russian БПФ, ОБПФ и преобразования Гильберта
+ */
 /*
 	PIP - Platform Independent Primitives
 	Class for FFT, IFFT and Hilbert transformations
@@ -19,6 +23,37 @@
 	You should have received a copy of the GNU Lesser General Public License
 	along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+//! \defgroup FFTW
+//! \~\brief
+//! \~english Optimized FFT support via libfftw3
+//! \~russian Оптимизированный БПФ с помощью libfftw3
+//!
+//! \~\details
+//! \~english \section cmake_module Building with CMake
+//! \~russian \section cmake_module Сборка с использованием CMake
+//!
+//! \code
+//! find_package(PIP REQUIRED)
+//! target_link_libraries([target] PIP::FFTW)
+//! \endcode
+//!
+//! \~english \par Common
+//! \~russian \par Общее
+//!
+//! \~english
+//! These files provides FFT using [libfftw3](https://fftw.org/)
+//!
+//! \~russian
+//! Эти файлы обеспечивают БПФ с использованием [libfftw3](https://fftw.org/)
+//!
+//! \~\authors
+//! \~english
+//! Ivan Pelipenko peri4ko@yandex.ru;
+//! Andrey Bychkov work.a.b@yandex.ru;
+//! \~russian
+//! Иван Пелипенко peri4ko@yandex.ru;
+//! Андрей Бычков work.a.b@yandex.ru;
+//!
 
 #ifndef PIFFT_H
 #define PIFFT_H