rv1103 rkmpi on musl

rkmpimusl.md

why?

rkmpi is library provided by rockchip, without source code

however it's uclibc target and provided toolchain is quite outdated, creating problems when i try to use new libraries with it

it would be great if we can use rkmpi on musl or glibc environment

how

(no success yet)

starting from https://github.com/luckfox-eng29/luckfox_pico_rtsp_opencv/tree/master as base

cd lib
rm -rf *.so *.so.* *opencv*
# excluding opencv because i'm not planning to use it

we now have to convert *.a files to .o files

(we don't use ar x here because i found it dropping some symbols)

for f in *.a ; do mkdir "${f%.a}" && cd "${f%.a}" && arm-rockchip830-linux-uclibcgnueabihf-ld -Ur -o a.o --allow-multiple-definition --whole-archive -L.. -l:$f --no-whole-archive && cd ..; done

now we link that single .o file with libc and libstdc++

arm-rockchip830-linux-uclibcgnueabihf-g++ -Urc -o librkmpifat.a -Wl,--strip-all,-exclude-libs,ALL,-Ur,--allow-multiple-definition */*.o -static-libgcc -static-libstdc++ -nostartfiles

now replace the compiler path on CMakelist and disable PIC

cmake_minimum_required(VERSION 3.10)
set(PKG_CONFIG_EXECUTABLE "/usr/bin/pkg-config")
#set(PKG_CONFIG_PATH "/alpine/usr/lib/pkgconfig/lib")
set(SDK_PATH $ENV{LUCKFOX_SDK_PATH})
if(NOT SDK_PATH)
    message(WARNING "Please Set Luckfox-pico SDK Path. Such as:export LUCKFOX_SDK_PATH=/home/user/luckfox-pico")
    #    return()
endif()

#set(CMAKE_C_COMPILER "${SDK_PATH}/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-gcc"
#)
set(CMAKE_C_COMPILER "/home/sodo/musl-gcc/armv7l-linux-musleabihf-cross/bin/armv7l-linux-musleabihf-gcc")
#set(CMAKE_CXX_COMPILER "${SDK_PATH}/tools/linux/toolchain/arm-rockchip830-linux-uclibcgnueabihf/bin/arm-rockchip830-linux-uclibcgnueabihf-g++"
#)

set(CMAKE_CXX_COMPILER "/home/sodo/musl-gcc/armv7l-linux-musleabihf-cross/bin/armv7l-linux-musleabihf-g++")


project(luckfox_rtsp_opencv)


link_directories(${CMAKE_CURRENT_SOURCE_DIR}/lib)
#add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/ 3rdparty.out)

set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
add_definitions(-DRV1106_1103)


#set(OpenCV_DIR "${CMAKE_CURRENT_SOURCE_DIR}/lib/cmake/opencv4")
#find_package(OpenCV REQUIRED)

#set(THREADS_PREFER_PTHREAD_FLAG ON)
#find_package(Threads REQUIRED)


add_executable(${PROJECT_NAME}  
               ${CMAKE_CURRENT_SOURCE_DIR}/src/main.cc
               ${CMAKE_CURRENT_SOURCE_DIR}/src/luckfox_mpi.cc 
               )

add_compile_options(-g -Wall
                    -DISP_HW_V30 -DRKPLATFORM=ON -DARCH64=OFF
                    -DROCKIVA -DUAPI2
                    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 
                    )

set(CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} -fno-pic -no-pie -Wl,--allow-multiple-definition,--strip-all,-rpath-link,${CMAKE_CURRENT_SOURCE_DIR}/lib:/usr/lib")

target_link_libraries(${PROJECT_NAME} PRIVATE
                    #${OpenCV_LIBS}
                    rkmpifat
					swscale
					avutil
                    #pthread
                    #m
                    #dl
                    #Threads::Threads
                    )


target_include_directories(${PROJECT_NAME} PRIVATE                        
                           ${CMAKE_CURRENT_SOURCE_DIR}
                           ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/rknpu2/include
                           ${OpenCV_INCLUDE_DIRS}
                           ${CMAKE_CURRENT_SOURCE_DIR}/common 
                           ${CMAKE_CURRENT_SOURCE_DIR}/common/isp3.x   
                           ${CMAKE_CURRENT_SOURCE_DIR}/include
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/uAPI2
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/common
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/xcore
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/algos
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/iq_parser
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/iq_parser_v2
                           ${CMAKE_CURRENT_SOURCE_DIR}/include/rkaiq/smartIr 
                          )
                    
set(CMAKE_INSTALL_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}/luckfox_rtsp_opencv_demo")
install(TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_PREFIX})
                          

some symbols were missing mostly swscale and avutil stuff

but there's still more missing like fa_utils_codec_name i think they are from https://github.com/wizardst/Rockit/tree/8c6c5e59b6069735e95e34cca2607b9b6541b520/src/rt_media/FFMpeg