1. description
As for libyuv [1] The use is not to be overlooked. Following is an official note
Scale YUV to prepare content for compression, with point, bilinear or box filter.
Convert to YUV from webcam formats for compression.
Convert to RGB formats for rendering/effects.
Rotate by 90/180/270 degrees to adjust for mobile devices in portrait mode.
Optimized for SSSE3/AVX2 on x86/x64.
Optimized for Neon on Arm.
Optimized for MSA on Mips
2. Compilation process
Of course, you can also compile it on Android Studio. This is compiled separately from Android Studio development environment, compiled dynamic and static libraries and header files directly, and can be copied to other libraries.
2.1 download
Download source code
: https://chromium.googlesource.com/libyuv/libyuv/+archive/refs/heads/master.tar.gz
The latest version is 1917, which can be downloaded from the source code include/libyuv/version.h to see the version number.
2.2 Modify the CMakeLists.txt script slightly
_Originally, we did not need to change the CMakeLists.txt script, just to store the directory, put the dynamic and static libraries in the lib directory, and the header files in the include directory. If you don't change the script, you can copy it manually after compiling.
The most important thing is that Android studio integrates cmake compilation and strips out the symbol table when it is packaged. We leave the Android Studio development environment and compile directly using Cmake. Whether Release version or Debug version, Cmake does not have Strip dropping symbol tables. The library will be larger, so we customize a command in the script and strip the symbol tables directly. Normally we don't debug open source libraries
# CMakeLists for libyuv # Originally created for "roxlu build system" to compile libyuv on windows # Run with -DTEST=ON to build unit tests PROJECT ( YUV C CXX ) # "C" is required even for C++ projects CMAKE_MINIMUM_REQUIRED( VERSION 2.8 ) OPTION( TEST "Built unit tests" OFF ) SET ( ly_base_dir ${PROJECT_SOURCE_DIR} ) SET ( ly_src_dir ${ly_base_dir}/source ) SET ( ly_inc_dir ${ly_base_dir}/include ) SET ( ly_tst_dir ${ly_base_dir}/unit_test ) SET ( ly_lib_name yuv ) SET ( ly_lib_static ${ly_lib_name} ) SET ( ly_lib_shared ${ly_lib_name}_shared ) FILE ( GLOB_RECURSE ly_source_files ${ly_src_dir}/*.cc ) LIST ( SORT ly_source_files ) FILE ( GLOB_RECURSE ly_unittest_sources ${ly_tst_dir}/*.cc ) LIST ( SORT ly_unittest_sources ) INCLUDE_DIRECTORIES( BEFORE ${ly_inc_dir} ) # this creates the static library (.a) ADD_LIBRARY ( ${ly_lib_static} STATIC ${ly_source_files} ) # this creates the shared library (.so) ADD_LIBRARY ( ${ly_lib_shared} SHARED ${ly_source_files} ) SET_TARGET_PROPERTIES ( ${ly_lib_shared} PROPERTIES OUTPUT_NAME "${ly_lib_name}" ) SET_TARGET_PROPERTIES ( ${ly_lib_shared} PROPERTIES PREFIX "lib" ) # this creates the conversion tool ADD_EXECUTABLE ( yuvconvert ${ly_base_dir}/util/yuvconvert.cc ) TARGET_LINK_LIBRARIES ( yuvconvert ${ly_lib_static} ) INCLUDE ( FindJPEG ) if (JPEG_FOUND) include_directories( ${JPEG_INCLUDE_DIR} ) target_link_libraries( yuvconvert ${JPEG_LIBRARY} ) add_definitions( -DHAVE_JPEG ) endif() if(TEST) find_library(GTEST_LIBRARY gtest) if(GTEST_LIBRARY STREQUAL "GTEST_LIBRARY-NOTFOUND") set(GTEST_SRC_DIR /usr/src/gtest CACHE STRING "Location of gtest sources") if(EXISTS ${GTEST_SRC_DIR}/src/gtest-all.cc) message(STATUS "building gtest from sources in ${GTEST_SRC_DIR}") set(gtest_sources ${GTEST_SRC_DIR}/src/gtest-all.cc) add_library(gtest STATIC ${gtest_sources}) include_directories(${GTEST_SRC_DIR}) include_directories(${GTEST_SRC_DIR}/include) set(GTEST_LIBRARY gtest) else() message(FATAL_ERROR "TEST is set but unable to find gtest library") endif() endif() add_executable(libyuv_unittest ${ly_unittest_sources}) target_link_libraries(libyuv_unittest ${ly_lib_name} ${GTEST_LIBRARY}) find_library(PTHREAD_LIBRARY pthread) if(NOT PTHREAD_LIBRARY STREQUAL "PTHREAD_LIBRARY-NOTFOUND") target_link_libraries(libyuv_unittest pthread) endif() if (JPEG_FOUND) target_link_libraries(libyuv_unittest ${JPEG_LIBRARY}) endif() if(NACL AND NACL_LIBC STREQUAL "newlib") target_link_libraries(libyuv_unittest glibc-compat) endif() find_library(GFLAGS_LIBRARY gflags) if(NOT GFLAGS_LIBRARY STREQUAL "GFLAGS_LIBRARY-NOTFOUND") target_link_libraries(libyuv_unittest gflags) add_definitions(-DLIBYUV_USE_GFLAGS) endif() endif() # -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- # To make the directory clearer, create the directory yourself if(NOT EXISTS CMAKE_INSTALL_PREFIX) message(WARNING "Catalog ${CMAKE_INSTALL_PREFIX}-----not exists---------------") file(MAKE_DIRECTORY ${CMAKE_INSTALL_PREFIX}/bin ${CMAKE_INSTALL_PREFIX}/lib ${CMAKE_INSTALL_PREFIX}/include) endif() #copy header folder, dynamic library and static library files are placed in lib directory, and header files are placed in include directory. add_custom_command( TARGET ${ly_lib_shared} POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy_directory ${ly_inc_dir} ${CMAKE_INSTALL_PREFIX}/include) # Symbol table of strip dynamic library add_custom_command( TARGET ${ly_lib_shared} POST_BUILD COMMAND "${ANDROID_TOOLCHAIN_PREFIX}strip" "--strip-unneeded" "-o" "${CMAKE_INSTALL_PREFIX}/lib/lib${ly_lib_name}-strip.so" "${CMAKE_INSTALL_PREFIX}/lib/lib${ly_lib_name}.so" COMMENT "strip Symbol table") # --------------------------------------------------------------------------------- # install the conversion tool, .so, .a, and all the header files INSTALL ( PROGRAMS ${CMAKE_BINARY_DIR}/yuvconvert DESTINATION ${CMAKE_INSTALL_PREFIX}/bin ) INSTALL ( TARGETS ${ly_lib_static} DESTINATION ${CMAKE_INSTALL_PREFIX}/lib ) INSTALL ( TARGETS ${ly_lib_shared} LIBRARY DESTINATION lib RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}/bin ) INSTALL ( DIRECTORY ${PROJECT_SOURCE_DIR}/include/ DESTINATION ${CMAKE_INSTALL_PREFIX}/include ) # create the .deb and .rpm packages using cpack INCLUDE ( CM_linux_packages.cmake )
2.3 Windows environment compiler script bat
@echo off cls ::========================================================================== ::This script is used in the Windows Environmental use Cmake Cross compilation Android Used libyuv library ::========================================================================== title cmake build libyuv chcp 65001>nul echo. echo. echo.--------This script is used in the Windows Environmental use Cmake Cross compilation Android Library used------ echo. echo CMD Path:%cd% echo current dir:%~dp0 rem Switch to the current directory cd /d %~dp0 :: -------------------------------------------------------------------------- rem Temporary variable set ANDROID_NDK=F:/Android/android-ndk-r16b set CMAKE_PATH=D:/Android/android-sdk/cmake/3.6.4111459 set NASM_PATH=D:/Progra~1/Android/nasm-2.13.03 set ANDROID_VERSION=24 set SOURCE_DIR=./libyuv-refs_heads_master set NATIVE_BUILD_DIR=. set INSTALL_DIR=%~dp0 :: -------------------------------------------------------------------------- echo. echo.--------------------------start build-------------------------------------- echo. rem --make armeabi call:buildLibTurboJpeg armeabi rem --make armeabi-v7a call:buildLibTurboJpeg armeabi-v7a rem --make arm64-v8a call:buildLibTurboJpeg arm64-v8a rem --make x86 call:buildLibTurboJpeg x86 rem --make x86_64 call:buildLibTurboJpeg x86_64 set timeout=5 echo.Count down %timeout% Exit automatically in seconds for /L %%a in (%timeout% -1 1) do ( ^ set /p=%%a . <nul&ping -n 2 127.0.0.1>nul ) echo. echo.&pause&goto:eof :: -------------------------------------------------------------------------- rem Defined function (%1:arch,%2:abi) :buildLibTurboJpeg setlocal echo.[func]-----------------start make [%1]--------------------------- echo. set ABI=%1 set BINARY_DIR="%NATIVE_BUILD_DIR%/bin/%ABI%" set PLATFORM_VERSION=%ANDROID_VERSION% set LIB_OUTPUT_DIR="%INSTALL_DIR%/dist/%ABI%" echo [func]----PLATFORM_VERSION==%ANDROID_VERSION% echo [func]----ABI==%ABI% echo [func]----SOURCE_DIR==%SOURCE_DIR% echo [func]----BINARY_DIR==%BINARY_DIR% echo [func]----LIB_OUTPUT_DIR==%LIB_OUTPUT_DIR% echo. echo. if not exist %BINARY_DIR% md %BINARY_DIR% cd /d %BINARY_DIR% :: -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=../../%LIB_OUTPUT_DIR% ^ :: -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY=../../%LIB_OUTPUT_DIR% ^ ::-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=%LIB_OUTPUT_DIR% ^ ::-DCMAKE_ARCHIVE_OUTPUT_DIRECTORY=%LIB_OUTPUT_DIR% ^ rem Open source libraries are available cmake Android Gradle - Ninja ^ cmake ^ -DANDROID_ABI=%ABI% ^ -DANDROID_PLATFORM=android-%PLATFORM_VERSION% ^ -DCMAKE_INSTALL_PREFIX=%LIB_OUTPUT_DIR% ^ -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=%LIB_OUTPUT_DIR%/lib ^ -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY=%LIB_OUTPUT_DIR%/lib ^ -DCMAKE_BUILD_TYPE=Release ^ -DANDROID_NDK=%ANDROID_NDK% ^ -DCMAKE_TOOLCHAIN_FILE=%ANDROID_NDK%/build/cmake/android.toolchain.cmake ^ -DCMAKE_MAKE_PROGRAM=%CMAKE_PATH%/bin/ninja.exe ^ -G"Android Gradle - Ninja" ^ -DANDROID_ARM_NEON=TRUE ^ -DANDROID_TOOLCHAIN=clang ^ -DANDROID_STL=c++_static ^ -DCMAKE_C_FLAGS=" -Os -Wall -pipe -fPIC" ^ -DANDROID_CPP_FEATURES=rtti exceptions ^ ../../%SOURCE_DIR% cmake --build ./ rem ninja -C . cd ../../ echo.[func]-----------------[%1] make end--------------------------- echo. endlocal goto:eof
2.4 Compile static and dynamic libraries
_Double-click the bat file saved by executing the above script and wait for compilation to complete.
Compile and install directory
ABIS
arm64-v8a
libs