做視頻圖像處理時需要對其進(jìn)行水印的添加，放在應(yīng)用層調(diào)用工具性能方面不太滿意，于是當(dāng)下采用opencv+libyuv方法進(jìn)行處理。

對于Android的jni開發(fā)不是很懂，我的需求是導(dǎo)入opencv方便在cpp中調(diào)用，但目前找到的教程都是把opencv作為模塊進(jìn)行導(dǎo)入，在java層查看。

摸索了一段時間終于搞完了！

1.下載對應(yīng)的openCV包(我目前版本為4.10.0)

opencv下載

解壓得到：

2.AS中進(jìn)行配置

2.1.把opencv的include文件夾復(fù)制到cpp目錄下

2.2.把opencv的libs放置到與cpp目錄同級的的jniLibs目錄下

按需選擇，我項目只需要前兩個

項目結(jié)構(gòu)如下：

3.對build.gradle(:模塊名)內(nèi)容進(jìn)行修改

android {defaultConfig {externalNativeBuild {cmake {cppFlags ''arguments "-DANDROID_STL=c++_shared"}}ndk {abiFilters 'arm64-v8a','armeabi-v7a'}}externalNativeBuild {cmake {path file('src/main/cpp/CMakeLists.txt')version '3.22.1'}}sourceSets {main {jniLibs.srcDirs = ['src/main/jniLibs'] //指定庫的位置}}
}

4.對CMakeLists.txt進(jìn)行修改

# 設(shè)置 OpenCV 的頭文件路徑
include_directories(${CMAKE_SOURCE_DIR}/cpp/include)# 設(shè)置庫的路徑  采用文件的絕對路徑  libyuv和opencv在同一層
set(OpenCV_LIBS_DIR "E:/AndroidProject/Demo/app/src/main/jniLibs/${ANDROID_ABI}")# 導(dǎo)入 OpenCV 的共享庫
add_library(opencv_java4 SHARED IMPORTED)
set_target_properties(opencv_java4 PROPERTIES IMPORTED_LOCATION${OpenCV_LIBS_DIR}/libopencv_java4.so# 設(shè)置頭文件
target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE ${CMAKE_SOURCE_DIR}/include)target_link_libraries(${CMAKE_PROJECT_NAME}androidopencv_java4 #鏈接聲明log)

測試cpp中是否可用opencv
導(dǎo)入頭文件即可：#include “opencv2/opencv.hpp”
沒有報錯即可正常使用，如果提示找不到opencv.hpp，則查看CMakeLists.txt中的路徑是否正確

libyuv導(dǎo)入同理，用的現(xiàn)成編譯好的so庫和頭文件
libyuv
下載解壓后得到：

頭文件在jni/include，庫在libs

最后，完整的CMakeLists.txt如下

cmake_minimum_required(VERSION 3.22.1)project("dvr")set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")# 設(shè)置 OpenCV 的頭文件路徑
include_directories(${CMAKE_SOURCE_DIR}/cpp/include)
# 導(dǎo)入 OpenCV 的共享庫
set(OpenCV_LIBS_DIR "E:/AndroidProject/Demo/app/src/main/jniLibs/${ANDROID_ABI}")
add_library(opencv_java4 SHARED IMPORTED)
set_target_properties(opencv_java4 PROPERTIES IMPORTED_LOCATION${OpenCV_LIBS_DIR}/libopencv_java4.so)# libyuv
add_library(yuv SHARED IMPORTED)
set_target_properties(yuv PROPERTIES IMPORTED_LOCATION${OpenCV_LIBS_DIR}/libyuv.so)add_library(${CMAKE_PROJECT_NAME} SHAREDdvr.cpp)target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE ${CMAKE_SOURCE_DIR}/include)
target_link_libraries(${CMAKE_PROJECT_NAME}androidopencv_java4yuvlog)

圖像處理什么的，opencv這些都導(dǎo)入成功了，自然也就簡單了