I've been trying to use LibVLC for Android and I followed the instructions at https://wiki.videolan.org/AndroidCompile and got it to work perfectly for ARM. However, when trying to compile it to x86, I set:
export ANDROID_ABI=x86
and then compiled in the same way, but now I have a problem as it fails to compile. Here's a truncated build log:
~/vlc-android$ sh compile.sh
VLC source found
Building tools
You are ready to build VLC and its contribs
Building the contribs
Generating EGL pkg-config file
Generating GLESv2 pkg-config file
Guessing build system... x86_64-linux-gnu
Creating configuration file... config.mak
Bootstrap completed.
...
config.status: executing libtool commands
Type "make; make install" to compile and install Speex
cd speexdsp && make install
make[1]: Entering directory `/home/user/vlc-android/vlc/contrib/contrib-android-i686-linux-android/speexdsp'
Making install in libspeexdsp
make[2]: Entering directory `/home/user/vlc-android/vlc/contrib/contrib-android-i686-linux-android/speexdsp/libspeexdsp'
CC resample.lo
In file included from resample.c:104:0:
resample_neon.h:142:21: error: redefinition of 'inner_product_single'
static inline float inner_product_single(const float *a, const float *b, unsigned int len)
^
In file included from resample.c:100:0:
resample_sse.h:40:21: note: previous definition of 'inner_product_single' was here
static inline float inner_product_single(const float *a, const float *b, unsigned int len)
^
make[2]: *** [resample.lo] Error 1
make[2]: Leaving directory `/home/user/vlc-android/vlc/contrib/contrib-android-i686-linux-android/speexdsp/libspeexdsp'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory `/home/user/vlc-android/vlc/contrib/contrib-android-i686-linux-android/speexdsp'
make: *** [.speexdsp] Error 2
As far as I can tell, in that project for some reason both the ARM headers and the SSE headers are being included, causing a redefinition error. However, I don't know why or what to try to fix it. Any suggestions would be much appreciated.
Autoconf doesn't look quite right, x86 build has nothing to do with NEON instruction set hence should not include resample_neon.h. I haven't found the root cause yet but for a quick solution, open resample.c under ../vlc-android/vlc/contrib/contrib-android-i686-linux-android/speexdsp/libspeexdsp and delete the following lines:
...
#ifdef _USE_NEON
#include "resample_neon.h"
#endif
...
then rerun the compile.sh, you should get a working apk for your x86 emulator/device.