add VAAPI with static libva/libdrm (no runtime deps)

Build libdrm and libva as static libraries so VAAPI support is
compiled into ffmpeg without adding any shared library dependencies.
At runtime, VA-API gracefully probes for GPU drivers via dlopen —
works when a driver is present, silently skipped otherwise.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: adeebshihadeh

ffmpeg/build.sh

@@ -8,6 +8,8 @@ PLATFORM="$(uname -s)"
 FFMPEG_VERSION="7.1"
 ZLIB_VERSION="da607da739fa6047df13e66a2af6b8bec7c2a498"  # v1.3.2
 X264_BRANCH="stable"
+LIBDRM_VERSION="libdrm-2.4.124"
+LIBVA_VERSION="2.22.0"
 INSTALL_DIR="$DIR/ffmpeg/install"
 
 NJOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 2)"
@@ -68,6 +70,40 @@ if [ "$PLATFORM" = "Linux" ]; then
   cmake --install vulkan-headers-src/build >/dev/null
 fi
 
+# --- Build libdrm + libva statically (Linux only, for VAAPI without runtime deps) ---
+if [ "$PLATFORM" = "Linux" ]; then
+  if ! command -v meson &>/dev/null; then
+    pip3 install --quiet meson ninja 2>/dev/null || python3 -m pip install --quiet meson ninja 2>/dev/null || true
+    command -v meson &>/dev/null || { echo "error: meson is required (apt install meson or pip install meson)" >&2; exit 1; }
+  fi
+
+  if [ ! -d "libdrm-src/.git" ]; then
+    rm -rf libdrm-src
+    git clone --depth 1 --branch "$LIBDRM_VERSION" https://gitlab.freedesktop.org/mesa/drm.git libdrm-src
+  fi
+  rm -rf libdrm-src/builddir
+  meson setup libdrm-src/builddir libdrm-src \
+    --prefix="$PREFIX" --libdir=lib --default-library=static \
+    -Dintel=disabled -Dradeon=disabled -Damdgpu=disabled -Dnouveau=disabled \
+    -Dvmwgfx=disabled -Dtests=false -Dman-pages=disabled -Dcairo-tests=disabled \
+    -Dvalgrind=disabled
+  ninja -C libdrm-src/builddir install
+
+  if [ ! -d "libva-src/.git" ]; then
+    rm -rf libva-src
+    git clone --depth 1 --branch "$LIBVA_VERSION" https://github.com/intel/libva.git libva-src
+  fi
+  rm -rf libva-src/builddir
+  # libva hardcodes shared_library(); patch to library() so --default-library=static works
+  sed -i 's/shared_library(/library(/g' libva-src/va/meson.build
+  PKG_CONFIG_PATH="$PREFIX/lib/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}" \
+  meson setup libva-src/builddir libva-src \
+    --prefix="$PREFIX" --libdir=lib --default-library=static \
+    -Ddisable_drm=false -Dwith_x11=no -Dwith_glx=no -Dwith_wayland=no \
+    -Dwith_win32=no -Denable_docs=false
+  ninja -C libva-src/builddir install
+fi
+
 # --- Build FFmpeg ---
 if [ ! -d "ffmpeg-src/.git" ]; then
   rm -rf ffmpeg-src
@@ -82,11 +118,18 @@ cd ffmpeg-src
 HW_FLAGS=()
 if [ "$PLATFORM" = "Linux" ]; then
   HW_FLAGS+=(
+    # use --static with pkg-config so static libva/libdrm resolve transitive deps
+    --pkg-config="pkg-config --static"
+
     # NVIDIA CUDA/NVDEC (uses dlopen at runtime)
     --enable-ffnvcodec --enable-cuda --enable-cuvid --enable-nvdec
     --enable-hwaccel=h264_nvdec,hevc_nvdec
     --enable-decoder=h264_cuvid,hevc_cuvid
 
+    # VAAPI (Intel/AMD — libva linked statically, driver loaded via dlopen at runtime)
+    --enable-vaapi
+    --enable-hwaccel=h264_vaapi,hevc_vaapi
+
     # V4L2 Memory-to-Memory (embedded: RPi, Qualcomm, Rockchip)
     --enable-v4l2-m2m
     --enable-decoder=h264_v4l2m2m,hevc_v4l2m2m
@@ -144,7 +187,11 @@ cp "$PREFIX/bin/ffmpeg" "$INSTALL_DIR/bin/"
 cp "$PREFIX/bin/ffprobe" "$INSTALL_DIR/bin/"
 
 # Libraries
-for lib in libavformat.a libavcodec.a libavutil.a libswresample.a libx264.a libz.a; do
+LIBS="libavformat.a libavcodec.a libavutil.a libswresample.a libx264.a libz.a"
+if [ "$PLATFORM" = "Linux" ]; then
+  LIBS="$LIBS libva.a libva-drm.a libdrm.a"
+fi
+for lib in $LIBS; do
   cp "$PREFIX/lib/$lib" "$INSTALL_DIR/lib/"
 done