contrib: add libav rules

Change-Id: Iab1ec2ef7d880127e36296058ccf20b551c79389
Refs: #46617

contrib/src/libav/rules.mak

+HASH=HEAD
+LIBAV_SNAPURL := http://git.libav.org/?p=libav.git;a=snapshot;h=$(HASH);sf=tgz
+
+LIBAVCONF = \
+        --cc="$(CC)"                 \
+        --pkg-config="$(PKG_CONFIG)" \
+        --disable-everything         \
+        --enable-gpl                 \
+        --enable-version3            \
+        --enable-decoders            \
+        --enable-protocols           \
+        --enable-demuxers            \
+        --enable-muxers              \
+        --enable-swscale
+
+#encoders
+LIBAVCONF += \
+        --enable-libx264             \
+        --enable-encoder=libvpx      \
+        --disable-decoder=libvpx     \
+        --disable-decoder=libvpx_vp8 \
+        --disable-decoder=libvpx_vp9 \
+        --enable-encoder=h263p
+
+
+DEPS_libav = zlib x264 vpx $(DEPS_vpx)
+
+
+ifdef HAVE_CROSS_COMPILE
+LIBAVCONF += --enable-cross-compile
+ifndef HAVE_DARWIN_OS
+LIBAVCONF += --cross-prefix=$(HOST)-
+endif
+endif
+
+# ARM stuff
+ifeq ($(ARCH),arm)
+ifdef HAVE_ARMV7A
+endif
+ifndef HAVE_DARWIN_OS
+LIBAVCONF += --arch=arm
+endif
+ifdef HAVE_NEON
+LIBAVCONF += --enable-neon
+endif
+ifdef HAVE_ARMV7A
+LIBAVCONF += --cpu=cortex-a8
+LIBAVCONF += --enable-thumb
+endif
+ifdef HAVE_ARMV6
+LIBAVCONF += --cpu=armv6 --disable-neon
+endif
+endif
+
+# x86 stuff
+ifeq ($(ARCH),i386)
+ifndef HAVE_DARWIN_OS
+LIBAVCONF += --arch=x86
+endif
+endif
+
+# Darwin
+ifdef HAVE_DARWIN_OS
+LIBAVCONF += --arch=$(ARCH) --target-os=darwin
+ifeq ($(ARCH),x86_64)
+LIBAVCONF += --cpu=core2
+endif
+endif
+ifdef HAVE_IOS
+LIBAVCONF += --enable-pic
+ifdef HAVE_NEON
+LIBAVCONF += --as="$(AS)"
+endif
+endif
+#ifdef HAVE_MACOSX
+#LIBAVCONF += --enable-vda
+#endif
+
+# Linux
+ifdef HAVE_LINUX
+LIBAVCONF += --target-os=linux --enable-pic
+ifndef HAVE_ANDROID
+LIBAVCONF += --enable-indev=v4l2 --enable-indev=x11grab --enable-x11grab
+endif
+endif
+
+# Windows
+ifdef HAVE_WIN32
+#ifndef HAVE_MINGW_W64
+#DEPS_libav += directx
+#endif
+
+LIBAVCONF += --target-os=mingw32 --enable-memalign-hack
+LIBAVCONF += --enable-w32threads --disable-decoder=dca
+#LIBAVCONF += --enable-dxva2
+
+ifdef HAVE_WIN64
+LIBAVCONF += --cpu=athlon64 --arch=x86_64
+else # !WIN64
+LIBAVCONF+= --cpu=i686 --arch=x86
+endif
+
+else # !Windows
+LIBAVCONF += --enable-pthreads
+endif
+
+# Build
+PKGS += libav
+ifeq ($(call need_pkg,"libavcodec >= 54.25.0 libavformat >= 53.21.0 libswscale libavutil >= 52.9"),)
+PKGS_FOUND += libav
+endif
+
+$(TARBALLS)/libav-$(HASH).tar.gz:
+	$(call download,$(LIBAV_SNAPURL))
+
+.sum-libav: $(TARBALLS)/libav-$(HASH).tar.gz
+	$(warning Not implemented.)
+	touch $@
+
+libav: libav-$(HASH).tar.gz .sum-libav
+	rm -Rf $@ $@-$(HASH)
+	mkdir -p $@-$(HASH)
+	$(ZCAT) "$<" | (cd $@-$(HASH) && tar xv --strip-components=1)
+	$(MOVE)
+
+.libav: libav
+	cd $< && $(HOSTVARS) ./configure \
+		--extra-ldflags="$(LDFLAGS)" $(LIBAVCONF) \
+		--prefix="$(PREFIX)" --enable-static --disable-shared
+	cd $< && $(MAKE) install-libs install-headers
+	touch $@