基于Android Studio3.2实现ffmpeg最简单的例子

墨蓝 2023-10-18 10:14 100阅读 0赞

#### 编译ffmpeg ####

首先，我们需要编译ffmpeg，具体可以看 [Ubuntu ffmpeg编译][Ubuntu ffmpeg]

#### 在AS中使用ffmpeg ####

新建一个带ndk的Android项目，复制选中的如下文件到项目的jniLibs目录的armeabi-v7a文件夹下  
![在这里插入图片描述][70]  
接着，复制include文件夹(头文件)到src/main/cpp文件夹下

> 把整个include文件夹都复制到cpp文件夹下，里面的依赖关系无需改动，ffmpeg内部已依赖好

![在这里插入图片描述][70 1]  
修改cpp文件夹下的native-lib.cpp为native-lib.c  
然后，编写CMakeLists

cmake_minimum_required(VERSION 3.4.1)
    
    #set(distribution_DIR ${CMAKE_SOURCE_DIR}/libs)            # 文件夹为libs的情况下
    set(distribution_DIR ${CMAKE_SOURCE_DIR}/src/main/jniLibs) # 文件夹为jniLibs的情况下
    message("distribution_DIR:" ${distribution_DIR})
    
    add_library( libavcodec-56
            SHARED
            IMPORTED )
    
    add_library( libavdevice-56
            SHARED
            IMPORTED )
    
    add_library( libavfilter-5
            SHARED
            IMPORTED )
    
    add_library( libavformat-56
            SHARED
            IMPORTED )
    
    add_library( libavutil-54
            SHARED
            IMPORTED )
    
    add_library( libpostproc-53
            SHARED
            IMPORTED )
    
    add_library( libswresample-1
            SHARED
            IMPORTED )
    
    add_library( libswscale-3
            SHARED
            IMPORTED )
    
    set_target_properties( libavcodec-56
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libavcodec-56.so)
    
    set_target_properties( libavdevice-56
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libavdevice-56.so)
    
    set_target_properties( libavfilter-5
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libavfilter-5.so)
    
    set_target_properties( libavformat-56
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libavformat-56.so)
    
    set_target_properties( libavutil-54
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libavutil-54.so)
    
    set_target_properties( libpostproc-53
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libpostproc-53.so)
    
    set_target_properties( libswresample-1
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libswresample-1.so)
    
    set_target_properties( libswscale-3
            PROPERTIES IMPORTED_LOCATION
            ${distribution_DIR}/${ANDROID_ABI}/libswscale-3.so)
    
    add_library(
            native-lib
            SHARED
            ${CMAKE_SOURCE_DIR}/src/main/cpp/native-lib.c) #如果是C++则为native-lib.cpp
    
    find_library(
            log-lib
            log)
    
    include_directories(src/main/cpp/include)
    
    target_link_libraries( # Specifies the target library.
            native-lib
            libavcodec-56
            libavdevice-56
            libavfilter-5
            libavformat-56
            libavutil-54
            libpostproc-53
            libswresample-1
            libswscale-3
            android #如果我们在编写代码时使用了ANativeWindow相关的方法的话，需要在链接库文件的时候加入android这个库文件，不然会报undefined reference to的错
            ${log-lib} )

然后，新建一个Java类VideoUtils

public class VideoUtils {
    	    static {
    	        //顺序不能乱
    	        System.loadLibrary("avutil-54");
    	        System.loadLibrary("swresample-1");
    	        System.loadLibrary("avcodec-56");
    	        System.loadLibrary("avformat-56");
    	        System.loadLibrary("swscale-3");
    	        System.loadLibrary("postproc-53");
    	        System.loadLibrary("avfilter-5");
    	        System.loadLibrary("avdevice-56");
    	        System.loadLibrary("native-lib");
    	    }
    	
    	    public native static String ffmpegInfo();
    	}

接着，在native-lib.c中实现ffmpegInfo方法

#include <jni.h>
    #include <android/log.h>
    //编码
    #include "include/libavcodec/avcodec.h"
    //封装格式处理
    #include "include/libavformat/avformat.h"
    //像素处理
    #include "include/libswscale/swscale.h"
    
    #define LOGI(FORMAT,...) __android_log_print(ANDROID_LOG_INFO,"heiko",FORMAT,__VA_ARGS__);
    #define LOGE(FORMAT,...) __android_log_print(ANDROID_LOG_ERROR,"heiko",FORMAT,__VA_ARGS__);
    
    JNIEXPORT jstring JNICALL
    Java_com_ethanco_ffmpegtest_VideoUtils_ffmpegInfo(JNIEnv *env, jclass type) {
        char info[10000] = { 0 };
        sprintf(info, "%s\n", avcodec_configuration());
        return (*env)->NewStringUTF(env, info);
    }

接着，我们调用ffmpeginfo方法

TextView tv = findViewById(R.id.sample_text);
    tv.setText(VideoUtils.ffmpegInfo());

最后，运行项目，如下图所示。  
![在这里插入图片描述][70 2]  
可以查看到FFmpeg类库相关的信息，即表示ffmpeg配置成功。

#### 其他 ####

[相关Demo][Demo]

[Ubuntu ffmpeg]: https://blog.csdn.net/EthanCo/article/details/83212646
[70]: https://img-blog.csdn.net/20181023013610355?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0V0aGFuQ28=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 1]: https://img-blog.csdn.net/20181023013922993?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0V0aGFuQ28=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 2]: https://img-blog.csdn.net/20181023015218618?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0V0aGFuQ28=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[Demo]: https://github.com/EthanCo/FFmpegTest/tree/master/FFmpegTest