使用ffmpeg 导入测试

上一节中编译了ffmpeg的库，这一节就那库来使用转码。

新建一个jni项目，目前as对于jni 有很好的支持，可以直接建立项目生成make 脚本等文件，不像eclipse，手动写mk等等。

生成的项目结构目录

cmake。配置添加

set(distribution_DIR /Users/xingweitong/androidProject/ffmpeg/app/libs/armeabi-v7a)

# 指定头文件目录

INCLUDE_DIRECTORIES(include)

add_library(avcodec-58

SHARED

IMPORTED)

set_target_properties(avcodec-58

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libavcodec-58.so)

add_library(avdevice-58

SHARED

IMPORTED)

set_target_properties(avdevice-58

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libavdevice-58.so)

add_library(avfilter-7

SHARED

IMPORTED)

set_target_properties(avfilter-7

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libavfilter-7.so)

add_library(avformat-58

SHARED

IMPORTED)

set_target_properties(avformat-58

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libavformat-58.so)

add_library(avutil-56

SHARED

IMPORTED)

set_target_properties(avutil-56

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libavutil-56.so)

add_library(swresample-3

SHARED

IMPORTED)

set_target_properties(swresample-3

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libswresample-3.so)

add_library(swscale-5

SHARED

IMPORTED)

set_target_properties(swscale-5

PROPERTIES IMPORTED_LOCATION

${distribution_DIR}/libswscale-5.so)

target_link_libraries(# Specifies the target library.

native-lib

avcodec-58

avdevice-58

avfilter-7

avformat-58

avutil-56

swresample-3

swscale-5

# Links the target library to the log library

# included in the NDK.

${log-lib}

)

c++代码

#include

extern "C" {

#include "libavcodec/avcodec.h"

}

extern "C" JNIEXPORT jstring JNICALL

Java_com_example_ffmpeg_MainActivity_stringFromJNI(

JNIEnv* env,

jobject /* this */) {

std::string hello ="Hello from C++";

hello= avcodec_configuration();

return env->NewStringUTF(hello.c_str());

}

as。配置添加

android{

sourceSets{

main{

jniLibs.srcDirs = ['libs']

}

ndk{

abiFilters'armeabi-v7a'

}

效果图