Android Studio 下通过 CMake 配置编译 libyuv 库
【摘要】
参考链接
创建 AS 工程，选择 Native C++，之后默认配置就可以了 （ps: 我工程的名字也取名为 libyuv 了，你们随意）
libyuv 的源码下载下来以后，放到 src/main/cpp 目录下
修改 src/main/cpp 目录下的 CMakeList.txt
# For mo...
创建 AS 工程，选择 Native C++，之后默认配置就可以了 （ps: 我工程的名字也取名为 libyuv 了，你们随意）
libyuv 的源码下载下来以后，放到 src/main/cpp 目录下
修改 src/main/cpp 目录下的 CMakeList.txt
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# For more information about using CMake with Android Studio, read the
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# documentation: https://d.android.com/studio/projects/add-native-code.html
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# Sets the minimum version of CMake required to build the native library.
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cmake_minimum_required(VERSION 3.4.1)
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include_directories(/home/lingyun/Projects/AndroidStudioProjects/libyuv/app/src/main/cpp/libyuv/include) # 重点，根据自己的路径进行修改
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add_subdirectory(/home/lingyun/Projects/AndroidStudioProjects/libyuv/app/src/main/cpp/libyuv) # 重点
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# Creates and names a library, sets it as either STATIC
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# or SHARED, and provides the relative paths to its source code.
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# You can define multiple libraries, and CMake builds them for you.
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# Gradle automatically packages shared libraries with your APK.
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add_library( # Sets the name of the library.
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native-lib
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# Sets the library as a shared library.
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SHARED
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# Provides a relative path to your source file(s).
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native-lib.cpp)
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# Searches for a specified prebuilt library and stores the path as a
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# variable. Because CMake includes system libraries in the search path by
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# default, you only need to specify the name of the public NDK library
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# you want to add. CMake verifies that the library exists before
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# completing its build.
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find_library( # Sets the name of the path variable.
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log-lib
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# Specifies the name of the NDK library that
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# you want CMake to locate.
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log)
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# Specifies libraries CMake should link to your target library. You
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# can link multiple libraries, such as libraries you define in this
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# build script, prebuilt third-party libraries, or system libraries.
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target_link_libraries( # Specifies the target library.
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native-lib
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# Links the target library to the log library
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# included in the NDK.
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${log-lib}
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yuv) # 重点
然后再修改 libyuv 库的 CMakeList.txt (去掉一些编译生成的文件，也可以不改，按自己需要编辑)
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# CMakeLists for libyuv
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# Originally created for "roxlu build system" to compile libyuv on windows
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# Run with -DTEST=ON to build unit tests
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PROJECT ( YUV C CXX ) # "C" is required even for C++ projects
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CMAKE_MINIMUM_REQUIRED( VERSION 2.8 )
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OPTION( TEST "Built unit tests" OFF )
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SET ( ly_base_dir ${PROJECT_SOURCE_DIR} )
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SET ( ly_src_dir ${ly_base_dir}/source )
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SET ( ly_inc_dir ${ly_base_dir}/include )
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SET ( ly_tst_dir ${ly_base_dir}/unit_test )
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SET ( ly_lib_name yuv )
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SET ( ly_lib_static ${ly_lib_name} )
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SET ( ly_lib_shared ${ly_lib_name}_shared )
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FILE ( GLOB_RECURSE ly_source_files ${ly_src_dir}/*.cc )
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LIST ( SORT ly_source_files )
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FILE ( GLOB_RECURSE ly_unittest_sources ${ly_tst_dir}/*.cc )
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LIST ( SORT ly_unittest_sources )
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INCLUDE_DIRECTORIES( BEFORE ${ly_inc_dir} )
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# this creates the static library (.a)
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ADD_LIBRARY ( ${ly_lib_static} STATIC ${ly_source_files} )
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# this creates the shared library (.so)
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ADD_LIBRARY ( ${ly_lib_shared} SHARED ${ly_source_files} )
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SET_TARGET_PROPERTIES ( ${ly_lib_shared} PROPERTIES OUTPUT_NAME "${ly_lib_name}" )
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SET_TARGET_PROPERTIES ( ${ly_lib_shared} PROPERTIES PREFIX "lib" )
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# this creates the conversion tool
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#ADD_EXECUTABLE ( yuvconvert ${ly_base_dir}/util/yuvconvert.cc )
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#TARGET_LINK_LIBRARIES ( yuvconvert ${ly_lib_static} )
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-
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INCLUDE ( FindJPEG )
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if (JPEG_FOUND)
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include_directories( ${JPEG_INCLUDE_DIR} )
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target_link_libraries( yuvconvert ${JPEG_LIBRARY} )
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add_definitions( -DHAVE_JPEG )
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endif()
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if(TEST)
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find_library(GTEST_LIBRARY gtest)
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if(GTEST_LIBRARY STREQUAL "GTEST_LIBRARY-NOTFOUND")
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set(GTEST_SRC_DIR /usr/src/gtest CACHE STRING "Location of gtest sources")
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if(EXISTS ${GTEST_SRC_DIR}/src/gtest-all.cc)
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message(STATUS "building gtest from sources in ${GTEST_SRC_DIR}")
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set(gtest_sources ${GTEST_SRC_DIR}/src/gtest-all.cc)
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add_library(gtest STATIC ${gtest_sources})
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include_directories(${GTEST_SRC_DIR})
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include_directories(${GTEST_SRC_DIR}/include)
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set(GTEST_LIBRARY gtest)
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else()
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message(FATAL_ERROR "TEST is set but unable to find gtest library")
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endif()
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endif()
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add_executable(libyuv_unittest ${ly_unittest_sources})
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target_link_libraries(libyuv_unittest ${ly_lib_name} ${GTEST_LIBRARY})
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find_library(PTHREAD_LIBRARY pthread)
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if(NOT PTHREAD_LIBRARY STREQUAL "PTHREAD_LIBRARY-NOTFOUND")
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target_link_libraries(libyuv_unittest pthread)
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endif()
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if (JPEG_FOUND)
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target_link_libraries(libyuv_unittest ${JPEG_LIBRARY})
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endif()
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if(NACL AND NACL_LIBC STREQUAL "newlib")
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target_link_libraries(libyuv_unittest glibc-compat)
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endif()
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find_library(GFLAGS_LIBRARY gflags)
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if(NOT GFLAGS_LIBRARY STREQUAL "GFLAGS_LIBRARY-NOTFOUND")
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target_link_libraries(libyuv_unittest gflags)
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add_definitions(-DLIBYUV_USE_GFLAGS)
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endif()
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endif()
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-
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# install the conversion tool, .so, .a, and all the header files
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#INSTALL ( PROGRAMS ${CMAKE_BINARY_DIR}/yuvconvert DESTINATION bin )
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#INSTALL ( TARGETS ${ly_lib_static} DESTINATION lib )
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#INSTALL ( TARGETS ${ly_lib_shared} LIBRARY DESTINATION lib RUNTIME DESTINATION bin )
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INSTALL ( DIRECTORY ${PROJECT_SOURCE_DIR}/include/ DESTINATION include )
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# create the .deb and .rpm packages using cpack
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#INCLUDE ( CM_linux_packages.cmake )
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YuvUtils.java
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package com.example.libyuv;
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-
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public class YuvUtils {
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-
static {
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System.loadLibrary("native-lib");
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}
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// 创建一个YuvUtils，有三个常用的方法，第一个就是NV21转I420，然后旋转I420，最后一个是NV21转换I420并顺时针旋转90度，可以替换前两个方法
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public static native void NV21ToI420(byte[] input, byte[] output, int width, int height);
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public static native void RotateI420(byte[] input, byte[] output, int width, int height, int rotation);
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public static native void NV21ToI420andRotate90Clockwise(byte[] input, byte[] output, int width, int height);
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}
native-lib.cpp
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#include <jni.h>
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#include <string>
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#include <cstring>
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#include <android/log.h>
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#include "libyuv/include/libyuv.h"
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#define LOG_TAG "libyuv"
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#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, __VA_ARGS__)
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#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
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#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
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#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
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using namespace libyuv;
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-
extern "C" JNIEXPORT jstring JNICALL
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Java_com_example_libyuv_MainActivity_stringFromJNI(
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JNIEnv *env,
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jobject /* this */) {
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std::string hello = "Hello from C++";
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return env->NewStringUTF(hello.c_str());
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}
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extern "C"
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JNIEXPORT void JNICALL
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Java_com_example_libyuv_YuvUtils_NV21ToI420(JNIEnv *env, jobject instance, jbyteArray input_,
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jbyteArray output_, jint in_width, jint in_height) {
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jbyte *srcData = env->GetByteArrayElements(input_, NULL);
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jbyte *dstData = env->GetByteArrayElements(output_, NULL);
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NV21ToI420((const uint8_t *) srcData, in_width,
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(uint8_t *) srcData + (in_width * in_height), in_width,
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(uint8_t *) dstData, in_width,
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(uint8_t *) dstData + (in_width * in_height), in_width / 2,
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(uint8_t *) dstData + (in_width * in_height * 5 / 4), in_width / 2,
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in_width, in_height);
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env->ReleaseByteArrayElements(input_, srcData, 0);
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env->ReleaseByteArrayElements(output_, dstData, 0);
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}
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extern "C"
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JNIEXPORT void JNICALL
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Java_com_example_libyuv_YuvUtils_RotateI420(JNIEnv *env, jobject type, jbyteArray input_,
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jbyteArray output_, jint in_width, jint in_height,
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jint rotation) {
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jbyte *srcData = env->GetByteArrayElements(input_, NULL);
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jbyte *dstData = env->GetByteArrayElements(output_, NULL);
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-
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RotationMode rotationMode = kRotate0;
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switch (rotation) {
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case 90:
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rotationMode = kRotate90;
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break;
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case 180:
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rotationMode = kRotate180;
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break;
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case 270:
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rotationMode = kRotate270;
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break;
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}
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I420Rotate((const uint8_t *) srcData, in_width,
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(uint8_t *) srcData + (in_width * in_height), in_width / 2,
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(uint8_t *) srcData + (in_width * in_height * 5 / 4), in_width / 2,
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(uint8_t *) dstData, in_height,
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(uint8_t *) dstData + (in_width * in_height), in_height / 2,
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(uint8_t *) dstData + (in_width * in_height * 5 / 4), in_height / 2,
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in_width, in_height,
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rotationMode);
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-
env->ReleaseByteArrayElements(input_, srcData, 0);
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env->ReleaseByteArrayElements(output_, dstData, 0);
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}
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extern "C"
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JNIEXPORT void JNICALL
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Java_com_example_libyuv_YuvUtils_NV21ToI420andRotate90Clockwise(JNIEnv *env, jobject type,
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jbyteArray input_,
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jbyteArray output_,
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jint in_width, jint in_height) {
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jbyte *srcData = env->GetByteArrayElements(input_, NULL);
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jbyte *dstData = env->GetByteArrayElements(output_, NULL);
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jsize size = env->GetArrayLength(input_);
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NV21ToI420((const uint8_t *) srcData, in_width,
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(uint8_t *) srcData + (in_width * in_height), in_width,
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(uint8_t *) dstData, in_width,
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(uint8_t *) dstData + (in_width * in_height), in_width / 2,
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(uint8_t *) dstData + (in_width * in_height * 5 / 4), in_width / 2,
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in_width, in_height);
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-
I420Rotate((const uint8_t *) dstData, in_width,
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(uint8_t *) dstData + (in_width * in_height), in_width / 2,
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(uint8_t *) dstData + (in_width * in_height * 5 / 4), in_width / 2,
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(uint8_t *) srcData, in_height,
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(uint8_t *) srcData + (in_width * in_height), in_height / 2,
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(uint8_t *) srcData + (in_width * in_height * 5 / 4), in_height / 2,
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in_width, in_height,
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kRotate90);
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memcpy(dstData, srcData, size);
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// fixme can't work
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// ConvertToI420((const uint8_t *) srcData, size,
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// (uint8_t *)dstData, in_width,
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// (uint8_t *)dstData + (in_width * in_height), in_width / 2,
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// (uint8_t *)dstData + (in_width * in_height * 5 / 4), in_width / 2,
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// 0, 0,
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// in_width, in_height,
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// in_width, in_height,
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// kRotate90,
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// FOURCC_NV21);
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//
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// fixme can't work
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// NV12ToI420Rotate((const uint8_t *) srcData, in_width,
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// (uint8_t *) srcData + (in_width * in_height), in_width,
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// (uint8_t *)dstData, in_width,
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// (uint8_t *)dstData + (in_width * in_height * 5 / 4), in_width / 2,
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// (uint8_t *)dstData + (in_width * in_height), in_width / 2,
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// in_width, in_height,
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// kRotate90);
-
-
env->ReleaseByteArrayElements(input_, srcData, 0);
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env->ReleaseByteArrayElements(output_, dstData, 0);
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}
build 生成的 so：
不过这个方法有个问题，就是没有把 neon 优化的代码编译进来，需要自己手动修改 CMakeList.txt，或者使用 .mk 的方式(参考0， 参考1，参考2)，亦或者通过 libyuv 的官网的方法进行编译。
根据 CMakeList 的方式（启用了 neon ）编译出来的大小为 200 多 KB （只测试了 Debug）
根据 mk 的方式编译出来的 libyuv.so 的大小也为 200多 KB (只测试了 Debug)
文章来源: panda1234lee.blog.csdn.net，作者：panda1234lee，版权归原作者所有，如需转载，请联系作者。
原文链接：panda1234lee.blog.csdn.net/article/details/89216200
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