some experiments on getting gst-plugins-gl to work on android

[Stefan Sauer]

hi,

I looked at bit into trying to build gst-plugin-gl for android. These
are the modifications:
1.) inside the gstramer_ndk_bundle dir get gst-plugin-gl and patch it
  git clone git://anongit.freedesktop.org/gstreamer/gst-plugins-gl
  git am 0001-build-Androigenizer-build-boilerplate.patch
 
2.) patch jni/Android.mk (0002-include-gst-plugins-gl.patch)

3.) build

Right now one showstopper gst-plugin-gl support GL or EGL only via X11
as it seems.

configure:22715: checking for eglGetError in -lEGL
configure:22740:
/home/ensonic/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc
-std=gnu99 -o conftest -nostdlib -Bdynamic
-Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections
-Wl,-z,nocopyreloc 
/home/ensonic/android/ndk/platforms/android-9/arch-arm/usr/lib/crtbegin_dynamic.o    
/home/ensonic/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a    
/home/ensonic/android/ndk/platforms/android-9/arch-arm/usr/lib/crtend_android.o
-I/include -I/include
-I/home/ensonic/android/ndk/platforms/android-9/arch-arm/usr/include
-I/home/ensonic/android/gstreamer_ndk_bundle/jni/../libid3tag
-I/home/ensonic/android/gstreamer_ndk_bundle/jni/../libmad 
-I/usr/include -I/usr/include -lc -ldl
-L/home/ensonic/android/ndk/platforms/android-9/arch-arm/usr/lib
-L/home/ensonic/android/gstreamer_ndk_bundle/obj/local/armeabi
-L/home/ensonic/android/gstreamer_ndk_bundle/jni/../libs
-Wl,--warn-unresolved-symbols conftest.c -lEGL    -L/usr/lib   -lX11
-L/usr/lib   -lX11 >&5
/usr/lib/libX11.so: file not recognized: File format not recognized

After applying HACK.patch it configures, but I have to figure how to
convince ndk-build to try building it...
Also in the long run it looks like we wound need a new
GL_BACKEND=xxxES2, julien any opinion?

Stefan
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