android studio ffmpeg简单使用 (cmake)

编译ffmpeg

android studio 新建项目,勾选上

将编译好的libffmpeg.so库扔到src/main/jniLibs/armeabi下(主要这里我只编译了arm的ffmpeg的库) 

新建文件com.jni.FFmpegCmd

package com.jni;

public class FFmpegCmd {

    static {
        System.loadLibrary("ffmpeg");
        System.loadLibrary("ffmpeg-cmd");
    }

    public static native int run(String[] commands);

}

 在cpp下 (即有native-lib.cpp的目录) 创建一个ffmpeg-cmd.cpp文件

#include <jni.h>
#include "ffmpeg.h"
#include "android_log.h"


extern "C" JNIEXPORT jint JNICALL
Java_com_jni_FFmpegCmd_run(JNIEnv *env, jobject, jobjectArray commands) {
    int argc = env->GetArrayLength(commands);
    char *argv[argc];
    for (int i = 0; i < argc; i++) {
        jstring js = (jstring) env->GetObjectArrayElement(commands, i);
        argv[i] = (char *) env->GetStringUTFChars(js, 0);
    }
    LOGD("============开始执行命令行===========");
    return main(argc, argv);
}

android_log.h

#ifdef ANDROID
#include <android/log.h>
#ifndef LOG_TAG
#define  MY_TAG   "MYTAG"
#define  AV_TAG   "AVLOG"
#endif
#define LOGE(format, ...)  __android_log_print(ANDROID_LOG_ERROR, MY_TAG, format, ##__VA_ARGS__)
#define LOGD(format, ...)  __android_log_print(ANDROID_LOG_DEBUG,  MY_TAG, format, ##__VA_ARGS__)
#define  XLOGD(...)  __android_log_print(ANDROID_LOG_INFO,AV_TAG,__VA_ARGS__)
#define  XLOGE(...)  __android_log_print(ANDROID_LOG_ERROR,AV_TAG,__VA_ARGS__)
#else
#define LOGE(format, ...)  printf(MY_TAG format "\n", ##__VA_ARGS__)
#define LOGD(format, ...)  printf(MY_TAG format "\n", ##__VA_ARGS__)
#define XLOGE(format, ...)  fprintf(stdout, AV_TAG ": " format "\n", ##__VA_ARGS__)
#define XLOGI(format, ...)  fprintf(stderr, AV_TAG ": " format "\n", ##__VA_ARGS__)
#endif

 

拷贝ffmpeg源码文件 cmdutils.c cmdutils.h ffmpeg.cffmpeg_filter.cffmpeg_opt.c ffmpeg_hw.c 到cpp目录下

ffmpeg-3.4之前的版本 不需要ffmpeg_hw.c文件,但是需要cmdutils_common_opts.h文件

ffmpeg编译后的文件夹include lib也拷贝到该目录

修改ffmpeg.h 在最后添加    int main(int argc, char **argv);

修改ffmpeg.c

在main方法最后添加(听说是为了防止为了重复执行ffmpeg命令闪退问题)

nb_filtergraphs = 0;
progress_avio = NULL;

input_streams = NULL;
nb_input_streams = 0;
input_files = NULL;
nb_input_files = 0;

output_streams = NULL;
nb_output_streams = 0;
output_files = NULL;
nb_output_files = 0;
修改cmdutils.h
修改前  void exit_program(int ret) av_noreturn;
修改后  int exit_program(int ret);

修改前  void show_help_children(const AVClass *class, int flags);//不修改的话编译一直出错 (可能是class关键字的原因,关键字不能当变量使用)
修改后  void show_help_children(const AVClass *avClass, int flags);

修改cmdutils.c

修改前
void exit_program(int ret)
{
    if (program_exit)
        program_exit(ret);

    exit(ret);
}
修改后
int exit_program(int ret)
{
    if (program_exit)
        program_exit(ret);

    return ret;
}

 CMakeLists.txt

cmake_minimum_required(VERSION 3.4.1)

add_library(ffmpeg-cmd
             SHARED
             src/main/cpp/cmdutils.c
             src/main/cpp/ffmpeg.c
             src/main/cpp/ffmpeg_filter.c
             src/main/cpp/ffmpeg_opt.c
             src/main/cpp/ffmpeg_hw.c
             src/main/cpp/ffmpeg-cmd.cpp)

find_library(log-lib
              log
              android)

#这里红色部分对应上面拷贝的两个文件夹路径,这里也可以不用拷贝这两个文件夹,直接把下面两行红色部分给成你电脑上编译好的ffmpeg的include和lib的路径 include_directories(src
/main/cpp/include src/main/cpp/lib E:/ffmpeg/4.0/build/ffmpeg-4.0) add_library(ffmpeg SHARED IMPORTED) set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION E:/ffmpeg/4.0/build/android/arm/libffmpeg.so) target_link_libraries( ffmpeg-cmd ffmpeg android ${log-lib} )

 build.gradle(Module:app)

这里主要需要处理红色圈圈部分,其他部分都是自动生成的

最后在MainActivity.java 测试一下

public class MainActivity extends AppCompatActivity {

    private ExecutorService es = Executors.newSingleThreadExecutor();
    String path = Environment.getExternalStorageDirectory().getPath();

      private static final int REQUEST_EXTERNAL_STORAGE = 1;
      private static String[] PERMISSIONS_STORAGE = {
              "android.permission.READ_EXTERNAL_STORAGE",
              "android.permission.WRITE_EXTERNAL_STORAGE" };

private ProgressDialog progressDialog;
    private TextView tv;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
try { //检测是否有写的权限 int permission = ActivityCompat.checkSelfPermission(activity, "android.permission.WRITE_EXTERNAL_STORAGE"); if (permission != PackageManager.PERMISSION_GRANTED) { // 没有写的权限,去申请写的权限,会弹出对话框 ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE); } } catch (Exception e) { e.printStackTrace(); } tv = findViewById(R.id.sample_text); tv.setText("测试"); tv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { progressDialog = ProgressDialog.show(MainActivity.this,"","处理中"); new Thread(new Runnable() { @Override public void run() { String str = "ffmpeg -i %s -vcodec copy -f mpegts -y %s";//mp4 转 ts -y如果有同名名则覆盖文件。不加-y则会提示有同名文件是否覆盖,这里再次执行的话会闪退 String commandStr = String.format(str,path+"/data/qq.mp4",path+"/data/qq.ts"); String[] commands = commandStr.split("\\s+"); for(String command:commands){ Log.d(MainActivity.class.getName(),"command="+command); } final int sum = FFmpegCmd.run(commands); new Handler(Looper.getMainLooper()).post(new Runnable() { @Override public void run() { if(sum == 0){ if(progressDialog != null){ progressDialog.dismiss(); } tv.setText("处理成功"); }else{ tv.setText("处理失败"); } } }); } }).start(); } }); } }

 

 AndroidManifest.xml 需要添加权限

<!--网络连接-->
<uses-permission android:name="android.permission.INTERNET" />
<!--sd卡读写   6.0以上系统可能还需要动态申请sd卡读写权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

 

posted @ 2018-04-30 17:39  荣超  阅读(1070)  评论(0编辑  收藏  举报