Add libass and all its dependencies

scripts.d/50-libass.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+ASS_REPO="https://github.com/libass/libass.git"
+ASS_COMMIT="e52ae4d1d326804574c90de1072873e848261508"
+
+ffbuild_enabled() {
+    return 0
+}
+
+ffbuild_dockerstage() {
+    to_df "ADD $SELF /root/ass.sh"
+    to_df "RUN bash -c 'source /root/ass.sh && ffbuild_dockerbuild && rm /root/ass.sh'"
+}
+
+ffbuild_dockerbuild() {
+    git clone "$ASS_REPO" ass || return -1
+    cd ass
+    git checkout "$ASS_COMMIT" || return -1
+
+    ./autogen.sh || return -1
+
+    local myconf=(
+        --prefix="$FFBUILD_PREFIX"
+        --disable-shared
+        --enable-static
+        --with-pic
+    )
+
+    if [[ $TARGET == win* ]]; then
+        myconf+=(
+            --host="$FFBUILD_TOOLCHAIN"
+        )
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    ./configure "${myconf[@]}" || return -1
+    make -j$(nproc) || return -1
+    make install || return -1
+
+    cd ..
+    rm -rf ass
+}
+
+ffbuild_configure() {
+    echo --enable-libass
+}
+
+ffbuild_unconfigure() {
+    echo --disable-libass
+}