老规矩,编译环境:Win10 1903,WSL ubuntu,ndk r20b,FFmpeg 4.2.2,首先分享下编译脚本:
#!/bin/bash make clean export NDK=/home/kres/android-ndk-r20b TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64/ API=21 function build_android { echo "Compiling FFmpeg for $CPU" ./configure \ --prefix=$PREFIX \ --enable-neon \ --enable-hwaccels \ --enable-gpl \ --enable-postproc \ --enable-shared \ --enable-jni \ --enable-mediacodec \ --disable-decoders \ --enable-decoder=h264_mediacodec \ --enable-decoder=vp9 \ --enable-decoder=h264 \ --enable-decoder=mpeg4 \ --enable-decoder=aac \ --enable-decoder=aac_latm \ --enable-decoder=mjpeg \ --enable-decoder=png \ --enable-decoder=mpeg4_mediacodec \ --disable-encoders \ --enable-encoder=vp9_vaapi --enable-encoder=h264_nvenc --enable-encoder=h264_v4l2m2m --enable-encoder=hevc_nvenc \ --disable-demuxers \ --enable-demuxer=rtsp --enable-demuxer=rtp --enable-demuxer=flv --enable-demuxer=h264 \ --disable-muxers \ --enable-muxer=rtsp --enable-muxer=rtp --enable-muxer=flv --enable-muxer=h264 \ --disable-parsers \ --enable-parser=mpeg4video --enable-parser=aac --enable-parser=h264 --enable-parser=vp9 \ --disable-protocols \ --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=tcp --enable-protocol=udp \ --disable-bsfs \ --disable-indevs --enable-indev=v4l2 \ --disable-outdevs \ --disable-filters \ --disable-postproc \ --disable-static \ --disable-doc \ --disable-ffmpeg \ --disable-ffplay \ --disable-ffprobe \ --enable-avdevice \ --disable-doc \ --disable-symver \ --cross-prefix=$CROSS_PREFIX \ --target-os=android \ --arch=$ARCH \ --cpu=$CPU \ --cc=$CC \ --cxx=$CXX \ --enable-cross-compile \ --sysroot=$SYSROOT \ --extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \ --extra-ldflags="$ADDI_LDFLAGS" \ $ADDITIONAL_CONFIGURE_FLAG make clean make -j6 make install echo "The Compilation of FFmpeg for $CPU is completed" } #armv8-a ARCH=arm64 CPU=armv8-a CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++ SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android- PREFIX=$(pwd)/android/$CPU OPTIMIZE_CFLAGS="-march=$CPU" build_android #armv7-a ARCH=arm CPU=armv7-a CC=$TOOLCHAIN/bin/armv7a-linux-androideabi$API-clang CXX=$TOOLCHAIN/bin/armv7a-linux-androideabi$API-clang++ SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi- PREFIX=$(pwd)/android/$CPU OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU " build_android #x86 ARCH=x86 CPU=x86 CC=$TOOLCHAIN/bin/i686-linux-android$API-clang CXX=$TOOLCHAIN/bin/i686-linux-android$API-clang++ SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot CROSS_PREFIX=$TOOLCHAIN/bin/i686-linux-android- PREFIX=$(pwd)/android/$CPU OPTIMIZE_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32" build_android #x86_64 ARCH=x86_64 CPU=x86-64 CC=$TOOLCHAIN/bin/x86_64-linux-android$API-clang CXX=$TOOLCHAIN/bin/x86_64-linux-android$API-clang++ SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot CROSS_PREFIX=$TOOLCHAIN/bin/x86_64-linux-android- PREFIX=$(pwd)/android/$CPU OPTIMIZE_CFLAGS="-march=$CPU -msse4.2 -mpopcnt -m64 -mtune=intel" build_android
其中,在编译到x86 32位版时,会遇到“error: inline assembly requires more registers than available”的问题:
libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available BRANCHLESS_GET_CABAC("%0", "%q0", "(%4)", "%1", "%w1", ^ libavcodec/x86/cabac.h:143:9: note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\ ^ libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available libavcodec/x86/cabac.h:143:9: note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\ ^ libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available libavcodec/x86/cabac.h:143:9: note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\ ^ libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available libavcodec/x86/cabac.h:143:9: note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\ ^ libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available libavcodec/x86/cabac.h:143:9: note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\ ^ libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available libavcodec/x86/cabac.h:143:9: note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\ ^ libavcodec/x86/cabac.h:193:9: error: inline assembly requires more registers than available libavcodec/x86/cabac.h:143:9CC libavcodec/h264_refs.o : note: expanded from macro 'BRANCHLESS_GET_CABAC' "movzbl "statep" , "ret" \n\t"\
各种修改编译脚本设置都无法解决,虽然ndk的32位abi感觉可能也不太会用到吧,但是强迫症发作还是想把它也编出来,最后查到这个: https://trac.ffmpeg.org/ticket/7796 ,研读后发现“ libavutil/x86/asm.h:75”中的
#define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE))
修改为:
#define HAVE_7REGS (ARCH_X86_64)
就可以编译通过了,先记下,后面发现副作用以及其它更新时再做补充。
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