ffmpeg: added new build options: x265, v4l2, vaapi and vdpau.

x265, vaapi and vdpau are enabled on x86.
v4l2 is enabled everywhere.

The v4l2 option has been added due to popular demand.

srcpkgs/ffmpeg/template

@@ -1,7 +1,7 @@
 # Template file for 'ffmpeg'
 pkgname=ffmpeg
 version=2.8
-revision=1
+revision=2
 short_desc="Decoding, encoding and streaming software"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="GPL-3"
@@ -14,17 +14,18 @@ makedepends="zlib-devel bzip2-devel freetype-devel alsa-lib-devel libXfixes-deve
  libXext-devel libXvMC-devel faac-devel faad2-devel lame-devel libtheora-devel
  gnutls-devel libvorbis-devel x264-devel xvidcore-devel jack-devel SDL-devel
  libcdio-paranoia-devel libvpx-devel librtmp-devel freetype-devel libmodplug-devel
- speex-devel celt-devel harfbuzz-devel libass-devel opus-devel pulseaudio-devel ocl-icd-devel"
+ speex-devel celt-devel harfbuzz-devel libass-devel opus-devel pulseaudio-devel
+ ocl-icd-devel $(vopt_if x265 x265-devel) $(vopt_if vaapi libva-devel)
+ $(vopt_if vdpau libvdpau-devel) $(vopt_if v4l2 v4l-utils-devel)"
+
+build_options="x265 v4l2 vaapi vdpau"
+build_options_default="v4l2"
 
 case "$XBPS_TARGET_MACHINE" in
-	# XXX x265 cannot be cross compiled
-	i686*|x86_64*) makedepends+=" x265-devel libva-devel libvdpau-devel";;
+	i686*|x86_64*) build_options_default+=" x265 vaapi vdpau";;
 esac
 
 do_configure() {
-	case "$XBPS_TARGET_MACHINE" in
-		i686*|x86_64*) _args="--enable-libx265 --enable-vdpau --enable-vaapi";;
-	esac
 	if [ "$CROSS_BUILD" ]; then
 		case "$XBPS_TARGET_MACHINE" in
 			arm*) _arch="arm";;
@@ -47,7 +48,10 @@ do_configure() {
 		--enable-libspeex --enable-libcelt --enable-libass \
 		--disable-libopencore_amrnb --disable-libopencore_amrwb \
 		--disable-libschroedinger --disable-libopenjpeg \
-		--enable-postproc --enable-opencl ${_args}
+		--enable-postproc --enable-opencl ${_args} \
+		$(vopt_if x265 '--enable-libx265' '--disable-libx265') \
+		$(vopt_if v4l2 '--enable-libv4l2' '--disable-libv4l2') \
+		$(vopt_enable vaapi) $(vopt_enable vdpau)
 }
 do_build() {
 	rm ${XBPS_WRAPPERDIR}/strip