use another avif library that works on aarch64-linux

linux/nix/devshell.nix

@@ -9,7 +9,6 @@ let
     ];
     cmakeVersions = [ "3.22.1" ];
     platformVersions = [
-      "31"
       "34"
       "36"
     ];
@@ -48,17 +47,7 @@ pkgs.mkShell {
 
     GRADLE_OPTS = "-Dorg.gradle.project.android.aapt2FromMavenOverride=${ANDROID_HOME}/build-tools/36.0.0/aapt2";
   }
-  // lib.optionalAttrs pkgs.stdenv.isLinux (
-    let
-      arch = if pkgs.stdenv.hostPlatform.isAarch64 then "arm64" else "x64";
-    in
-    {
-      LD_LIBRARY_PATH = lib.concatStringsSep ":" [
-        "./build/native_assets/linux"
-        "./build/linux/${arch}/debug/bundle/lib"
-        "./build/linux/${arch}/release/bundle/lib"
-        (lib.makeLibraryPath [ pkgs.zlib ])
-      ];
-    }
-  );
+  // lib.optionalAttrs pkgs.stdenv.isLinux {
+    LD_LIBRARY_PATH = "./build/native_assets/linux:${lib.makeLibraryPath [ pkgs.zlib ]}";
+  };
 }

linux/nix/pkg/avif_native.nix

@@ -0,0 +1,49 @@
+# avif_native's build hook downloads its prebuilt library, which the sandbox
+# can't do, so bundle it and point the manifest at the local copy instead
+{
+  stdenv,
+  fetchurl,
+  jq,
+}:
+let
+  artifacts = {
+    x86_64-linux = {
+      arch = "x64";
+      sha256 = "252b064f8ff4f0f265bc44294d4a7ed703dd7199688942c272dd8aa8d3039d5a";
+    };
+    aarch64-linux = {
+      arch = "arm64";
+      sha256 = "cdcf17cfd18b9b0f965b72615ddf11246121114577dc570d0bba25964e56c726";
+    };
+  };
+  inherit (artifacts.${stdenv.hostPlatform.system}) arch sha256;
+  key = "linux-${arch}-decode-dav1d";
+in
+{ version, src, ... }:
+stdenv.mkDerivation {
+  pname = "avif_native";
+  inherit version src;
+  inherit (src) passthru;
+
+  nativeBuildInputs = [ jq ];
+
+  library = fetchurl {
+    url = "https://github.com/Zhangw1998/avif_native/releases/download/native-v0.1.0/${key}-libavif_native.so.gz";
+    inherit sha256;
+  };
+
+  # The hook checksums the library, so it must stay byte-identical
+  dontFixup = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    cp -r . $out
+    chmod -R u+w $out
+    gunzip -c $library > $out/native/libavif_native.so
+    jq '.artifacts["${key}"].path = "libavif_native.so"' \
+      native/manifest.json > $out/native/manifest.json
+
+    runHook postInstall
+  '';
+}

linux/nix/pkg/default.nix

@@ -34,6 +34,8 @@ flutter.buildFlutterApplication {
 
   autoPubspecLock = src + "/pubspec.lock";
 
+  customSourceBuilders.avif_native = callPackage ./avif_native.nix { };
+
   gitHashes = {
     linkify = "sha256-TpMD6+0zyY6i9l+6d8ErnVufmepCv362rCtnbOht/z4=";
     fab_m3e = "sha256-5V9m6yY0jimx2gh7lQHYg4HDKQ4Wrl0ATmBhw5DkQMI=";