使用Android平台的线程支持编译x264

Question

I've been tryin' to compile x264 for Android with Thread Support...But with no success...

I've managed to compile the same without thread support...The configure command is as follows :

./configure --prefix=$PREFIX \
--enable-pic \
--host=arm-linux \
--disable-cli \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--sysroot=$PLATFORM 

where PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.7/prebuilt/linux-x86 and PLATFORM=$NDK/platforms/android-14/arch-arm

I've also tried with and without the option --enable-static and extra-ldflags="-lpthread" , but when attempted make it ends with errors.

Is there any way to accomplish the above said...?

Answer 1

The error that seemed to appear in config.log in context to thread support was cannot find lpthread ... That got resolved by manually removing the -lpthread from the configure file. But then the configuration started failing at the test that included the struct cpu_set_t and CPU_COUNT() ...

Seems that certain libc functions and definitions are not included in the code provided with Android NDK (R8D) ...In the above case CPU_COUNT() and the definition for struct cpu_set_t ...

The workaround for the above was to patch sched.h with the latest version ... There are a few bug reports in the Android Issue List describing the same problem which would hopefully be addressed in the next NDK release...

Also x264 could be compiled to include the " ARM Support Feature " by including the option --extra-cflags="-mfloat-abi=softfp" ...