gstreamer rewrite

shell.nix

@@ -1,15 +1,17 @@
-with import <nixpkgs> {};
-
-stdenv.mkDerivation {
-    name = "audio_conv";
-    buildInputs = [
-        stdenv
-        pkg-config
-        ffmpeg_4
-        clang
-        cargo
-        rustc
-        rls
-    ];
-    LIBCLANG_PATH="${llvmPackages.libclang}/lib";
-}
+let
+    moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+    nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
+    rustpkgs = nixpkgs.rustChannels.stable;
+in
+    with nixpkgs;
+    stdenv.mkDerivation {
+        name = "audio-conv";
+        buildInputs = [
+            rustpkgs.rust
+            rustpkgs.cargo
+            rustpkgs.rls-preview
+            rustpkgs.rustfmt-preview
+            gst_all_1.gstreamer
+            gst_all_1.gst-plugins-base
+        ];
+    }