Add Nix flake for the project (#232)

* Add Nix flake for the project

* Add `codec2` library for M17 encoding support

.gitignore

@@ -9,3 +9,4 @@ examples
 *.ans
 *.patch
 *.zip
+result

flake.lock

@@ -0,0 +1,64 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1709336216,
+        "narHash": "sha256-Dt/wOWeW6Sqm11Yh+2+t0dfEWxoMxGBvv3JpIocFl9E=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "f7b3c975cf067e56e7cda6cb098ebe3fb4d74ca2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1711163522,
+        "narHash": "sha256-YN/Ciidm+A0fmJPWlHBGvVkcarYWSC+s3NTPk/P+q3c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "44d0940ea560dee511026a53f0e2e2cde489b4d4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1709237383,
+        "narHash": "sha256-cy6ArO4k5qTx+l5o+0mL9f5fa86tYUX3ozE1S+Txlds=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1536926ef5621b09bba54035ae2bb6d806d72ac8",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,18 @@
+{
+  description = "Digital Speech Decoder - Florida Man Edition ";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
+      perSystem = { config, pkgs, ... }: {
+        packages.default = config.packages.dsd-fme;
+
+        packages.dsd-fme = pkgs.callPackage ./package.nix { };
+      };
+    };
+}

package.nix

@@ -0,0 +1,46 @@
+{ lib
+, stdenv
+, cmake
+, mbelib
+, libsndfile
+, ncurses
+, pulseaudio
+, rtl-sdr
+, itpp
+, codec2
+, portaudioSupport ? true
+, portaudio ? null
+}:
+
+assert portaudioSupport -> portaudio != null;
+
+stdenv.mkDerivation {
+  name = "dsd-fme";
+
+  src = ./.;
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [
+    mbelib
+    libsndfile
+    itpp
+    rtl-sdr
+    ncurses.dev
+    pulseaudio.dev
+    codec2
+  ] ++ lib.optionals portaudioSupport [ portaudio ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Digital Speech Decoder - Florida Man Edition";
+    longDescription = ''
+      DSD is able to decode several digital voice formats from discriminator
+      tap audio and synthesize the decoded speech. Speech synthesis requires
+      mbelib, which is a separate package.
+    '';
+    homepage = "https://github.com/szechyjs/dsd";
+    license = licenses.mit;
+    platforms = platforms.unix;
+  };
+}