add ffmpeg builds script

tools/build-ffmpeg.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+. $(dirname $0)/environment.sh
+
+if [ ! -d $TMPROOT/ffmpeg-android ] ; then
+	try pushd $TMPROOT
+	try git clone -b ios https://github.com/tito/ffmpeg-android
+	try cd ffmpeg-android
+	try popd
+fi
+
+cd $TMPROOT/ffmpeg-android
+if [ ! -d ffmpeg ]; then
+	try ./extract.sh
+fi
+
+OLD_CC="$CC"
+OLD_CFLAGS="$CFLAGS"
+OLD_LDFLAGS="$LDFLAGS"
+OLD_LDSHARED="$LDSHARED"
+export CC="$ARM_CC"
+export CFLAGS="$ARM_CFLAGS"
+export LDFLAGS="$ARM_LDFLAGS"
+export LDSHARED="$KIVYIOSROOT/tools/liblink"
+
+# build ffmpeg library
+try env FFMPEG_ARCHS="ios" ./build-h264-aac.sh
+
+# build python extension
+cd python
+export FFMPEG_LIBRAIRES="SDL2 SDL_mixer"
+export FFMPEG_LIBRARY_DIRS="$BUILDROOT/lib/lib"
+export FFMPEG_INCLUDES="$BUILDROOT/include $BUILDROOT/include/SDL"
+export FFMPEG_ROOT="$TMPROOT/ffmpeg-android/build/ffmpeg/armeabi-neon"
+
+$HOSTPYTHON setup.py build_ext -v &>/dev/null
+try find . -iname '*.pyx' -exec $KIVYIOSROOT/tools/cythonize.py {} \;
+try $HOSTPYTHON setup.py install -O2 --root iosbuild
+try find iosbuild | grep -E '.*\.(py|pyc|so\.o|so\.a|so\.libs)$$' | xargs rm
+try cp -a iosbuild/usr/local/lib/python2.7/site-packages/ffmpeg "$BUILDROOT/python/lib/python2.7/site-packages"
+
+export CC="$OLD_CC"
+export CFLAGS="$OLD_CFLAGS"
+export LDFLAGS="$OLD_LDFLAGS"
+export LDSHARED="$OLD_LDSHARED"
+
+bd=$TMPROOT/ffmpeg-android/python/build/lib.macosx-*/ffmpeg
+try $KIVYIOSROOT/tools/biglink $BUILDROOT/lib/libffmpeg.a $bd
+deduplicate $BUILDROOT/lib/libffmpeg.a
+
+# copy ffmpeg libraries too
+try cp -a $TMPROOT/ffmpeg-android/build/ffmpeg/armeabi-a8/lib/*.a $BUILDROOT/lib/