demucs-rs: init at 0.3.4 (#498241)

pkgs/by-name/de/demucs-rs/package.nix

@@ -0,0 +1,60 @@
+{
+  lib,
+  fetchFromGitHub,
+  rustPlatform,
+  pkg-config,
+  openssl,
+  vulkan-loader,
+  makeWrapper,
+  stdenv,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "demucs-rs";
+  version = "0.3.4";
+
+  src = fetchFromGitHub {
+    owner = "nikhilunni";
+    repo = "demucs-rs";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-IidfPS+/T8aJoW30gdnKhhsgluMt+h9RllAXH9Yrq1g=";
+  };
+
+  cargoHash = "sha256-xngHyenlB3sMqzJHNk9utk4TNhdt+awutDuP1JzhhBA=";
+
+  # Only build the CLI crate, not the DAW plugin or WASM targets
+  buildAndTestSubdir = "demucs-cli";
+
+  nativeBuildInputs = [
+    pkg-config
+    makeWrapper
+  ];
+
+  buildInputs = [
+    openssl
+  ];
+
+  # wgpu dlopen()s libvulkan at runtime, so LD_LIBRARY_PATH is needed (RPATH has no effect).
+  # this is Linux-only: on Darwin wgpu uses Metal and should need no runtime patching.
+  postInstall = lib.optionalString stdenv.hostPlatform.isLinux ''
+    wrapProgram $out/bin/demucs \
+      --prefix LD_LIBRARY_PATH : "${vulkan-loader}/lib"
+  '';
+
+  meta = {
+    description = "Native Rust implementation of HTDemucs v4 music source separation CLI";
+    longDescription = ''
+      A native Rust implementation of HTDemucs v4 — state-of-the-art music
+      source separation. Splits any song into individual stems (drums, bass,
+      vocals, etc.) using GPU-accelerated inference via Burn.
+
+      Model weights are downloaded automatically from Hugging Face on first
+      use and cached for future runs.
+    '';
+    homepage = "https://github.com/nikhilunni/demucs-rs";
+    license = lib.licenses.asl20;
+    mainProgram = "demucs";
+    maintainers = with lib.maintainers; [ eymeric ];
+    platforms = lib.platforms.unix;
+  };
+})