Android/FFMPEG dynamic module, JNI simple wrapper

Android/FFMPEG dynamic module, JNI simple wrapper on production device, we can't use "Executable File ".

We need to build "dynamic, so module" for FFMPEG/ffserver.

This post explain how to build so module and simple JNI interface for FFMPEG.

1) Change FFMPEG. c

A) Add JNI part.

//////////////////////////////////////// //////////////////////////////////////// ////////////////////////////

// Kks...

# Include

Int m_argc = 0;

Int m_max_argc = 30;

Char * m_pargv [30];

Int dynamic_ffpmeg_main (INT argc, char ** argv );

Jint jnicall java_com_ccmedia_codec_ffmpeg_mod_1run (jnienv *, jclass, jstring, jstring );

Jint jnicall java_com_ccmedia_codec_ffmpeg_mod_1run (jnienv * ENV, jclass, jstring pj1, jstring pj2 ){

Jint JI;

Jboolean IC;

Char sz_temp [2, 1024];

Char SEPs [] = "";

Char * psztoken, * pszdata;

Int I = 0;

Const char * pszname;

Pszname = (* env)-> getstringutfchars (ENV, pj1, & ic );

Sprintf (sz_temp, "FFMPEG % s", pszname );

If (Ic = jni_true) (* env)-> releasestringutfchars (ENV, pj1, pszname );

// Strcpy (sz_temp, "FFMPEG-I/sdcard/arm_and/bin/TV _dump.mpg http: // localhost: 8090/feed1.ffm ");

Printf ("[debug] % s/n", sz_temp );

Psztoken = strtok (sz_temp, SEPs );

While (psztoken! = NULL ){

M_pargv [m_argc] = (char *) malloc (strlen (psztoken ));

Strcpy (m_pargv [m_argc], psztoken );

M_argc ++;

Psztoken = strtok (null, SEPs );

}

For (I = 0; I <m_argc; I ++ ){

Printf ("argc [% d] = % s/n", I, m_pargv [I]);

}

Dynamic_ffpmeg_main (m_argc, m_pargv );

Ji = 0;

Return JI;

}

B) Change main function
Original --> int main (INT argc, char ** argv)

New --> int dynamic_ffpmeg_main (INT argc, char ** argv)

C) Add "new main function"

Int main (INT argc, char ** argv)

{

Dynamic_ffpmeg_main (argc, argv );

Return 0;

}

2) Build FFMPEG.

-On preivious post, you can find "Configure" option to build FFMPEG.

Http://demo860.blogspot.com/2010/06/ffmpeg-libx264-build-for-android.html

3) Build FFMPEG so module using following command.

I use ndk R4,/export/home/Android/ndk/

/Export/home/Android/ndk/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/ARM-Eabi-gcc/

-Nostdlib-wl,-soname, libffmpeg. So-wl,-shared,-bsymbolic/

Cmdutils. o ffmpeg. O/

-Wl, -- no-whole-archive-wl, -- whole-archive/

/Export/home/Android/android-ndk-r4/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/GCC/ARM-Eabi/4.4.0/libgcc./

/Export/home/Android/ndk/build/platforms/Android-8/arch-arm/usr/lib/libc. So/

/Export/home/Android/ndk/build/platforms/Android-8/arch-arm/usr/lib/libstdc ++. So/

/Export/home/Android/ndk/build/platforms/Android-8/arch-arm/usr/lib/libm. So/

/Export/home/Android/ndk/build/platforms/Android-8/arch-arm/usr/lib/libz. So/

/Export/home/Android/ndk/build/platforms/Android-8/arch-arm/usr/lib/libdl. So/

-Wl, -- no-undefined-wl,-Z, noexecstack-wl, -rpath-link =/export/home/Android/ndk/build/platforms/Android-8/arch-arm/usr/lib/

./Libavutil./

./Libavcodec./

./Libavfilter./

./Libavformat./

./Libswscale./

./Libavdevice./

-O libffmpeg. So

4) Now you can use using following FFMPEG wrapper.

Public class FFMPEG implements runnable {

Static Boolean m_bret = false;

Static string m_szconfig = "-I/sdcard/file. mpg-vcodec MPEG4 AAA. mpg ";

Public native string unimplementedstringfromjni ();

Static {

Try {

System. Out. println ("[addbcache] module load try FFMPEG:" + system. getproperty ("Java. Library. Path "));

// System. Load ("/sdcard/arm_and/bin/libffmpeg. So ");

System. loadlibrary ("FFMPEG ");

System. Out. println ("[addbcache] module load success ");

}

Catch (exception e ){

System. Out. println ("[addbcache] module load err:" + system. getproperty ("Java. Library. Path "));

}

}

Private Static synchronized final native int mod_run (string name, string sztoken );

Public void set_config (string sz_config ){

M_szconfig = sz_config;

}

Public void run_core (string sz_file, string sz_token ){

Int n_stat;

M_bret = false;

N_stat = mod_run (m_szconfig, sz_token );

M_bret = true;

}

Public void run (){

Run_core ("","");

}

}

5) FFMPEG/ffserver,

-I made both, dynamic module and run it.
-The speed is OK but it's used cpu so much.

Posted by demo860

1 comments:

BRYAN:

Hello, what does your FFMPEG make file look like?

Thanks!