toradex arm imx6 opencv-3.4.0编译移植测试
核心板采用toradex imx6, 内核：Linux version 3.14.52
host linux编译器: gcc-7.2.1，来自https://www.linaro.org/downloads/
1.ffmpeg相关
(1).编译x264
(2).编译xvidcore
(3).编译ffmpeg
2.编译opencv，cmake文件：
set(MY_TOOLCHAIN_PATH"/opt/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf")
set(ENV{PKG_CONFIG_PATH} ${MY_TOOLCHAIN_PATH}/lib/pkgconfig)
set(ENV{LD_LIBRARY_PATH} ${MY_TOOLCHAIN_PATH}/lib)
set(ENV{C_INCLUDE_PATH} ${MY_TOOLCHAIN_PATH}/include)
set(ENV{CPLUS_INCLUDE_PATH}${MY_TOOLCHAIN_PATH}/include)
set(CMAKE_SYSTEM_NAME Linux )
set(CMAKE_SYSTEM_PROCESSOR arm )
set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc )
set( CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++ )
set(CMAKE_FIND_ROOT_PATH ${MY_TOOLCHAIN_PATH} )
set(ARM_LINUX_SYSROOT ${MY_TOOLCHAIN_PATH} CACHE PATH "ARM cross compilation systemroot")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARYONLY )
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
set(CMAKE_CXX_FLAGS "" CACHE STRING "c++flags")
set(CMAKE_C_FLAGS "" CACHE STRING "cflags")
set(CMAKE_SHARED_LINKER_FLAGS"" CACHESTRING "shared linker flags")
set(CMAKE_MODULE_LINKER_FLAGS"" CACHESTRING "module linker flags")
set(CMAKE_EXE_LINKER_FLAGS "-Wl,-z,nocopyreloc" CACHE STRING "executable linkerflags")
set(MY_FLAGS1" -I${MY_TOOLCHAIN_PATH}/include -L${MY_TOOLCHAIN_PATH}/lib ")
set(MY_FLAGS2" -lxvidcore -lx264 -lswscale -lswresample -lavformat ")
set(MY_FLAGS3" -lavutil -lavcodec -lavdevice -lavfilter -lpostproc ")
set(CMAKE_CXX_FLAGS"${CMAKE_CXX_FLAGS} ${MY_FLAGS1}${MY_FLAGS2} ${MY_FLAGS3}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${MY_FLAGS1} ${MY_FLAGS2}${MY_FLAGS3}")cmake指令：
cmake-DCMAKE_TOOLCHAIN_FILE=../toolchain.make \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX=./install \
-DBUILD_PNG=ON \
-DBUILD_TIFF=ON \
-DBUILD_TBB=ON \
-DBUILD_JPEG=ON \
-DBUILD_JASPER=ON \
-DBUILD_ZLIB=ON \
-DBUILD_opencv_java=OFF \
-DBUILD_opencv_python=OFF \
-DBUILD_opencv_python2=OFF \
-DBUILD_opencv_python3=OFF \
-DBUILD_TESTS=OFF \
-DBUILD_PERF_TESTS=OFF \
-DBUILD_EXAMPLES=OFF \
-DWITH_GSTREAMER=OFF \
-DINSTALL_TESTS=OFF \
-DBUILD_opencv_nonfree=ON \
-DWITH_GTK=OFF \
-DWITH_OPENCL=ON \
-DWITH_OPENMP=ON \
-DWITH_FFMPEG=ON \
-DWITH_IPP=ON \
-DWITH_CUDA=OFF \
-DWITH_VTK=OFF \
-DWITH_TBB=OFF \
-DWITH_1394=OFF \
-DWITH_OPENEXR=OFF \
-DINSTALL_C_EXAMPLES=OFF \
-DOPENCV_TEST_DATA_PATH=/home/wyt/toradex/opencv-3.3.1/opencv_extra-3.3.1/testdata\
-DOPENCV_EXTRA_MODULES_PATH=/home/wyt/toradex/opencv-3.3.1/opencv_contrib-3.3.1/modules\
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3.host linux设置：
CROSS_COMPILE=arm-none-linux-gnueabi-
exportPKG_CONFIG_PATH=/opt/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf/lib/pkgconfig:$PKG_CONFIG_PATH
exportPKG_CONFIG_PATH=/home/wyt/toradex/opencv-3.3.1/build/install/lib/pkgconfig:$PKG_CONFIG_PATH
4.target linux
根据需要拷贝toolchain的libstdc++.so.6.0.24
5.ffmpeg测试：
ffmpeg -irtsp://admin:[email protected]:554/h264/1/main/av_stream -vcodec copy./out.avi
6.opencv arm端测试
读取rtsp码流，1280x720分辨率，实测动目标检测470ms每帧，后期优化tbb和ipp应该可以更高