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• How to link .so library on Android

  9 juin 2014, par Sayaki

  I’m trying to use FFMpeg with Android. First of all I have tryed to build FFMpeg on my Mac but I cant do that. I checked many solution on Internet but none working. Becouse of that I try to build FFMpeg on Ubuntu 12.04. I try a lot of solutions bu finally I found this example and I succeed build it. Then I get headers files and .so files. Then I copy all of them on my mac and try to use it in my project. I copy this files to my project. Now my project tree looks like this :

  picture

  Here is my Android.mk file :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := avformat
  
  LOCAL_SRC_FILES := libavformat.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include/libavformat
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE    := ndksetup
  
  LOCAL_SRC_FILES := native.c
  
  LOCAL_LDLIBS := -llog
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  Here is my Application.mk file :

  APP_MODULES := ndksetup
  
  APP_PLATFORM := android-8
  
  LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libavformat.so

  Here is my natice.c file :

  #include 
  
  #include 
  
  #include <android></android>log.h>
  
  #include "include/libavcodec/avcodec.h"
  
  #include "include/libavformat/avformat.h"
  
  
  
  #define DEBUG_TAG "NDKSetupActivity"
  
  
  
  void Java_com_example_ndksetup_MainActivity_printLog(JNIEnv *env, jobject this,
  
          jstring logString) {
  
      av_register_all();
  
      jboolean isCopy;
  
      const char * szLogString = (*env)->GetStringUTFChars(env, logString,
  
              &amp;isCopy);
  
  
  
      __android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK: %s", szLogString);
  
  
  
      (*env)->ReleaseStringUTFChars(env, logString, szLogString);
  
  }
  
  
  
  jint Java_com_example_ndksetup_MainActivity_fibonacci(JNIEnv * env,
  
          jobject this, jint value) {
  
      if (value &lt;= 1)
  
          return value;
  
      return Java_com_example_ndksetup_MainActivity_fibonacci(env, this,
  
              value - 1)
  
              + Java_com_example_ndksetup_MainActivity_fibonacci(env, this,
  
                      value - 2);
  
  }

  I get error

  [armeabi] SharedLibrary  : libndksetup.so
  
  /Applications/adt-bundle-mac-x86_64-20140321/sdk/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/michal/Desktop/NDKSetup/obj/local/armeabi/objs/ndksetup/native.o: in function Java_com_example_ndksetup_MainActivity_printLog:/Users/michal/Desktop/NDKSetup/jni/native.c:11: error: undefined reference to 'av_register_all'
  
  collect2: ld returned 1 exit status
  
  make: *** [/Users/michal/Desktop/NDKSetup/obj/local/armeabi/libndksetup.so] Error 1

  And I really dont know how to deal with it. Can you tell me what Im dooing wrong and how can I fix it ? Or maybe there is another way to use .so library in Android

• Core : Update link in comment for Luhn algorithm

  20 novembre 2014, par IgorNadj

  Core : Update link in comment for Luhn algorithm
  Closes #1329
  

• Anomalie #3351 : Le header ’link’ est affiché dans la page généré au lieu d’être envoyé par PHP

  21 novembre 2014, par marcimat ☺☮☯♫

  Il faut lire « Comme celui-ci, l’un d’eux … » évidemment.