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下载代码
https://github.com/lemenkov/libyuv/ -
环境变量配置NDK地址
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修改Android.mk文件，删除jpeg和test
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新建application.mk
#APP_ABI是用于指定编译哪个平台的库 , 可以写多个 用空格隔开 (libyuv默认吧所有平台都编了) APP_ABI := arm64-v8a#APP_PLATFORM为指定android平台版本 差不多相当于SDK里面的targetSDKVersion APP_PLATFORM := android-23 -
进入下载目录，执行ndk-build
Android NDK: Could not find application project directory ! Android NDK: Please define the NDK_PROJECT_PATH variable to point to it. D:\sdk\ndk\21.4.7075529\build\\..\build\core\build-local.mk:151: *** Android NDK: Aborting . Stop.如上错误需要新建jni文件夹，source、jni、Android.mk、application.mk复制到jni，在jni目录下执行
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下面错误需要启用对ARMv8.2-A架构的编译器支持，在Android.mk添加
LOCAL_CFLAGS += -march=armv8.2-a+dotprod[arm64-v8a] Compile++ : yuv_static <= compare.cc [arm64-v8a] Compile++ : yuv_static <= compare_common.cc [arm64-v8a] Compile++ : yuv_static <= compare_gcc.cc [arm64-v8a] Compile++ : yuv_static <= compare_msa.cc [arm64-v8a] Compile++ : yuv_static <= compare_neon.cc [arm64-v8a] Compile++ : yuv_static <= compare_neon64.cc C:/Users/Desktop/libyuv-main/jni/source/compare_neon64.cc:175:8: error: instruction requires: dotprod"udot v4.4s, v0.16b, v6.16b \n"^ <inline asm>:14:1: note: instantiated into assembly here udot v4.4s, v0.16b, v6.16b ^ C:/Users/Desktop/libyuv-main/jni/source/compare_neon64.cc:176:8: error: instruction requires: dotprod"udot v5.4s, v1.16b, v6.16b \n"^ <inline asm>:15:1: note: instantiated into assembly here udot v5.4s, v1.16b, v6.16b ^ C:/Users/Desktop/libyuv-main/jni/source/compare_neon64.cc:204:8: error: instruction requires: dotprod"udot v4.4s, v0.16b, v0.16b \n"^ <inline asm>:10:1: note: instantiated into assembly here udot v4.4s, v0.16b, v0.16b ^ C:/Users/Desktop/libyuv-main/jni/source/compare_neon64.cc:205:8: error: instruction requires: dotprod"udot v5.4s, v1.16b, v1.16b \n"^ <inline asm>:11:1: note: instantiated into assembly here udot v5.4s, v1.16b, v1.16b ^ 4 errors generated. -
下面错误需要升级NDK版本>22
C:/Users/Desktop/libyuv-main/jni/source/row_neon64.cc:2780:8: error: unrecognized instruction mnemonic, did you mean: sdot, udot? "usdot v2.4s, v0.16b, v16.16b \n" ^ <inline asm>:9:1: note: instantiated into assembly here usdot v2.4s, v0.16b, v16.16b ^ C:/Users/Desktop/libyuv-main/jni/source/row_neon64.cc:2781:8: error: unrecognized instruction mnemonic, did you mean: sdot, udot? "usdot v3.4s, v1.16b, v16.16b \n" ^ <inline asm>:10:1: note: instantiated into assembly here usdot v3.4s, v1.16b, v16.16b ^ C:/Users/Desktop/libyuv-main/jni/source/row_neon64.cc:2782:8: error: unrecognized instruction mnemonic, did you mean: sdot, udot? "usdot v4.4s, v0.16b, v17.16b \n" ^ <inline asm>:11:1: note: instantiated into assembly here usdot v4.4s, v0.16b, v17.16b -
编译动态库出错，需要在Android.mk添加定义宏DLIBYUV_DISABLE_SVE
ld: error: undefined symbol: AYUVToUVRow_SVE2 >>> referenced by convert.cc:1790 (source/convert.cc:1790) >>> C:/Users/Desktop/libyuv-main/obj/local/arm64-v8a/objs/yuv_library/source/convert.o:(AYUVToNV12) >>> referenced by convert.cc:1790 (source/convert.cc:1790) >>> C:/Users/Desktop/libyuv-main/obj/local/arm64-v8a/objs/yuv_library/source/convert.o:(AYUVToNV12) >>> referenced by row_any.cc:2482 (source/row_any.cc:2482) >>> C:/Users/Desktop/libyuv-main/obj/local/arm64-v8a/objs/yuv_library/source/row_any.o:(AYUVToUVRow_Any_SVE2) >>> referenced 1 more timesld: error: undefined symbol: AYUVToVURow_SVE2 >>> referenced by convert.cc:1867 (source/convert.cc:1867) >>> C:/Users/Desktop/libyuv-main/obj/local/arm64-v8a/objs/yuv_library/source/convert.o:(AYUVToNV21) >>> referenced by convert.cc:1867 (source/convert.cc:1867) >>> C:/Users/Desktop/libyuv-main/obj/local/arm64-v8a/objs/yuv_library/source/convert.o:(AYUVToNV21) >>> referenced by row_any.cc:2485 (source/row_any.cc:2485) >>> C:/Users/Desktop/libyuv-main/obj/local/arm64-v8a/objs/yuv_library/source/row_any.o:(AYUVToVURow_Any_SVE2) >>> referenced 1 more times -
完整Android.mk
# This is the Android makefile for libyuv for NDK. LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_CPP_EXTENSION := .ccLOCAL_SRC_FILES := \source/compare.cc \source/compare_common.cc \source/compare_gcc.cc \source/compare_msa.cc \source/compare_neon.cc \source/compare_neon64.cc \source/compare_win.cc \source/convert.cc \source/convert_argb.cc \source/convert_from.cc \source/convert_from_argb.cc \source/convert_to_argb.cc \source/convert_to_i420.cc \source/cpu_id.cc \source/planar_functions.cc \source/rotate.cc \source/rotate_any.cc \source/rotate_argb.cc \source/rotate_common.cc \source/rotate_gcc.cc \source/rotate_msa.cc \source/rotate_neon.cc \source/rotate_neon64.cc \source/rotate_win.cc \source/row_any.cc \source/row_common.cc \source/row_gcc.cc \source/row_msa.cc \source/row_neon.cc \source/row_neon64.cc \source/row_win.cc \source/scale.cc \source/scale_any.cc \source/scale_argb.cc \source/scale_common.cc \source/scale_gcc.cc \source/scale_msa.cc \source/scale_neon.cc \source/scale_neon64.cc \source/scale_rgb.cc \source/scale_uv.cc \source/scale_win.cc \source/video_common.cccommon_CFLAGS := -Wall -fexceptions -march=armv8.4-a+dotprod+i8mm -DLIBYUV_DISABLE_SVE=1LOCAL_CFLAGS += $(common_CFLAGS) LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include LOCAL_C_INCLUDES += $(LOCAL_PATH)/include LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/includeLOCAL_MODULE := libyuv_library LOCAL_MODULE_TAGS := optionalinclude $(BUILD_SHARED_LIBRARY)
