Add librist

Signed-off-by: nanake <nanake@users.noreply.github.com>

scripts.d/50-librist.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+LIBRIST_REPO="https://code.videolan.org/rist/librist.git"
+LIBRIST_COMMIT="0b1aaf995c4cad83d562ec7887180cc6ee132c84"
+
+ffbuild_enabled() {
+    return 0
+}
+
+ffbuild_dockerbuild() {
+    git-mini-clone "$LIBRIST_REPO" "$LIBRIST_COMMIT" librist
+    cd librist
+
+    mkdir build && cd build
+
+    local myconf=(
+        --prefix="$FFBUILD_PREFIX"
+        --buildtype=release
+        --default-library=static
+        -D{built_tools,test}"=false"
+    )
+
+    if [[ $TARGET == win* ]]; then
+        myconf+=(
+            -Dhave_mingw_pthreads=true
+            -Duse_mbedtls=false
+        )
+    fi
+
+    if [[ $TARGET == win* || $TARGET == linux* ]]; then
+        myconf+=(
+            --cross-file=/cross.meson
+        )
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    meson "${myconf[@]}" ..
+    ninja -j"$(nproc)"
+    ninja install
+}
+
+ffbuild_configure() {
+    echo --enable-librist
+}
+
+ffbuild_unconfigure() {
+    echo --disable-librist
+}