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.gitignore

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+# IDEA files
+.idea
+
+# VsCode files
+.vscode
+
+# CMake files
+cmake_install.cmake
+CMakeCache.txt
+Makefile
+CMakeFiles
+cmake-build-*
+build
+
+# python files
+__pycache__
+
+# main output files
+output

.gitmodules

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+[submodule "src/external/matplotplusplus"]
+	path = examples/external/matplotplusplus
+	url = https://github.com/alandefreitas/matplotplusplus.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.22)
+project(signal_processing VERSION 1.0.0 LANGUAGES CXX)
+set(SIGNAL_PROCESSING_VERSION ${CMAKE_PROJECT_VERSION})
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# C++11 and OpenMP
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -fopenmp")
+find_package(OpenMP REQUIRED)
+
+# Dependencies and src
+include_directories(src/external src)
+
+# Add library to the build
+add_subdirectory(src)
+
+# Optionally add examples
+option(BUILD_EXAMPLES "Build example programs" ON)
+if(BUILD_EXAMPLES)
+    # Add examples
+    add_subdirectory(examples)
+endif()
+
+# Optionally add benchmarks
+option(BUILD_BENCHMARKS "Build benchmark programs" ON)
+if(BUILD_BENCHMARKS)
+    # Add benchmarks
+    add_subdirectory(benchmarks)
+endif ()

CMakePresets.json

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+{
+  "version": 3,
+  "cmakeMinimumRequired": {
+    "major": 3,
+    "minor": 22,
+    "patch": 0
+  },
+  "configurePresets": [
+    {
+      "name": "base-ninja",
+      "displayName": "Base Preset using Ninja",
+      "description": "Base preset for all builds with Ninja generator",
+      "hidden": true,
+      "generator": "Ninja",
+      "binaryDir": "${sourceDir}/build/${presetName}",
+      "cacheVariables": {
+        "CMAKE_CXX_STANDARD": "20",
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
+      }
+    },
+    {
+      "name": "base-make",
+      "displayName": "Base Preset using Make (Ninja is preferred, consider using it)",
+      "description": "Base preset for all builds with Make generator",
+      "hidden": true,
+      "generator": "Unix Makefiles",
+      "binaryDir": "${sourceDir}/build/${presetName}",
+      "cacheVariables": {
+          "CMAKE_CXX_STANDARD": "20",
+          "CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
+      }
+    },
+    {
+      "name": "ninja-dev-benchmark",
+      "displayName": "Build the signal processing library with examples and benchmark (required packages: opencv, matplot++, google benchmark)",
+      "description": "Development build with example programs and benchmark",
+      "generator": "Ninja",
+      "binaryDir": "${sourceDir}/build/${presetName}",
+      "cacheVariables": {
+        "CMAKE_CXX_STANDARD": "20",
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON",
+        "CMAKE_BUILD_TYPE": "Release",
+        "BUILD_EXAMPLES": "OFF",
+        "BUILD_BENCHMARKS": "ON"
+      }
+    },
+    {
+      "name": "ninja-lib",
+      "displayName": "Build the signal processing library with Ninja (fastest, recommended)",
+      "inherits": "base-ninja",
+      "description": "Build only the FFT library in a clean way (no examples)",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug",
+        "BUILD_EXAMPLES": "OFF",
+        "BUILD_BENCHMARKS": "OFF"
+      }
+    },
+    {
+      "name": "ninja-dev",
+      "displayName": "Build the signal processing library with examples (required packages: opencv and matplot++)",
+      "inherits": "base-ninja",
+      "description": "Development build with example programs",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug",
+        "BUILD_EXAMPLES": "ON",
+        "BUILD_BENCHMARKS": "OFF"
+      }
+    },
+    {
+      "name": "make-lib",
+      "displayName": "Build the signal processing library with Make (Ninja is preferred, consider using it)",
+      "inherits": "base-make",
+      "description": "Build only the FFT library in a clean way (no examples)",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug",
+        "BUILD_EXAMPLES": "OFF",
+        "BUILD_BENCHMARKS": "OFF"
+      }
+    },
+    {
+      "name": "make-dev",
+      "displayName": "Build the signal processing library with examples (Ninja is preferred, consider using it; required packages: opencv and matplot++)",
+      "inherits": "base-make",
+      "description": "Development build with example programs",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug",
+        "BUILD_EXAMPLES": "ON",
+        "BUILD_BENCHMARKS": "OFF"
+      }
+    }
+  ]
+}

LICENSE

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+MIT License
+
+Copyright (c) 2025 AMSC24-25
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.