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• Integrating FFMPEG using cmake : undefined reference when linking libraries

  21 novembre 2018, par Hamed Momeni

  I’ve been trying to cross-compile ffmpeg for different Android cpu archs for couple of days now and I have finally succeeded in the task. But now that I need to integrate these pre-built .so files in my project I’m facing errors which have me baffled.

  This is the CMakeLists.txt which I’m using :

  cmake_minimum_required(VERSION 3.4.1)
  
  
  
  # convert SDK path to forward slashes on Windows
  
  file(TO_CMAKE_PATH ${PATH_TO_SUPERPOWERED} PATH_TO_SUPERPOWERED)
  
  
  
  set(CMAKE_VERBOSE_MAKEFILE on)
  
  
  
  include_directories(src/main/cpp)
  
  include_directories(${PATH_TO_SUPERPOWERED})
  
  include_directories(${PATH_TO_FFMPEG}/${ANDROID_ABI}/include)
  
  
  
  add_library(
  
          avutil
  
          SHARED
  
          ${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavutil.so
  
  )
  
  set_target_properties(avutil PROPERTIES LINKER_LANGUAGE CXX)
  
  
  
  add_library(
  
          avformat
  
          SHARED
  
          ${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavformat.so
  
  )
  
  set_target_properties(avformat PROPERTIES LINKER_LANGUAGE CXX)
  
  
  
  add_library(
  
          avcodec
  
          SHARED
  
          ${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavcodec.so
  
  )
  
  set_target_properties(avcodec PROPERTIES LINKER_LANGUAGE CXX)
  
  
  
  
  
  
  
  add_library(
  
          Canto
  
          SHARED
  
          src/main/cpp/Dubsmash.cpp
  
          src/main/cpp/Karaoke.cpp
  
          src/main/cpp/Singing.cpp
  
          src/main/cpp/EditDubsmash.cpp
  
          ${PATH_TO_SUPERPOWERED}/AndroidIO/SuperpoweredAndroidAudioIO.cpp
  
  )
  
  
  
  # link the native library against the following libraries
  
  target_link_libraries(
  
          Canto
  
          avutil
  
          avformat
  
          avcodec
  
          ${PATH_TO_SUPERPOWERED}/libSuperpoweredAndroid${ANDROID_ABI}.a
  
          OpenSLES
  
          log
  
          android
  
  )

  And this is the source of the file I’m getting errors on :

  #include 
  
  #include <android></android>log.h>
  
  #include <string>
  
  // unrelated includes
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavutil></libavutil>dict.h>
  
  
  
  #define log_write __android_log_write
  
  #define log_print __android_log_print
  
  
  
  // unrelated code parts
  
  
  
  int print_file_data(const char *filePath) {
  
      AVFormatContext *fmt_ctx = NULL;
  
      AVDictionaryEntry *tag = NULL;
  
      int ret;
  
  
  
      if ((ret = avformat_open_input(&amp;fmt_ctx, filePath, NULL, NULL)))
  
          return ret;
  
  
  
      while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
  
          log_print(ANDROID_LOG_DEBUG, "%s=%s\n", tag->key, tag->value);
  
  
  
      avformat_close_input(&amp;fmt_ctx);
  
      return 0;
  
  }
  
  </string>

  And finally the errors themselves :

  FAILURE: Build failed with an exception.
  
  
  
  * What went wrong:
  
  Execution failed for task ':app:externalNativeBuildDebug'.
  
  > Build command failed.
  
    Error while executing process /home/hamed/dev/android-tools/android-sdk-linux/cmake/3.6.4111459/bin/cmake with arguments {--build /home/hamed/dev/projects/canto/Canto/app/.externalNativeBuild/cmake/debug/x86 --target Canto}
  
    [1/1] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/x86/libCanto.so
  
    FAILED: : && /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  --target=i686-none-linux-android16 --gcc-toolchain=/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 --sysroot=/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sysroot -fPIC -isystem /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sysroot/usr/include/i686-linux-android -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -fsigned-char -I/home/hamed/dev/projects/canto/Canto/app/../Superpowered -I/home/hamed/dev/projects/canto/Canto/app/../ffmpeg -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/platforms/android-16/arch-x86 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -L/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86 -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libCanto.so -o ../../../../build/intermediates/cmake/debug/obj/x86/libCanto.so CMakeFiles/Canto.dir/src/main/cpp/Dubsmash.cpp.o CMakeFiles/Canto.dir/src/main/cpp/Karaoke.cpp.o CMakeFiles/Canto.dir/src/main/cpp/Singing.cpp.o CMakeFiles/Canto.dir/src/main/cpp/EditDubsmash.cpp.o CMakeFiles/Canto.dir/home/hamed/dev/projects/canto/Canto/Superpowered/AndroidIO/SuperpoweredAndroidAudioIO.cpp.o  ../../../../build/intermediates/cmake/debug/obj/x86/libavutil.so ../../../../build/intermediates/cmake/debug/obj/x86/libavformat.so ../../../../../Superpowered/libSuperpoweredAndroidx86.a -lOpenSLES -llog -landroid -latomic -lm "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++_static.a" "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++abi.a" "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libandroid_support.a" && :
  
    /home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:295: error: undefined reference to 'avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)'
  
    /home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:298: error: undefined reference to 'av_dict_get(AVDictionary const*, char const*, AVDictionaryEntry const*, int)'
  
    /home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:301: error: undefined reference to 'avformat_close_input(AVFormatContext**)'
  
    clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
    ninja: build stopped: subcommand failed.

  Obviously the linker can not find the needed libraries, but why ?!

  UPDATE
  This is the result of running nm on libavutil.so :

  0000000000000510 t atexit
  
  0000000000000500 t __atexit_handler_wrapper
  
  0000000000002008 A __bss_start
  
                   U __cxa_atexit
  
                   U __cxa_finalize
  
  0000000000002000 d __dso_handle
  
  0000000000001dd8 d _DYNAMIC
  
  0000000000002008 A _edata
  
  00000000000004e0 t __emutls_unregister_key
  
  0000000000002008 A _end
  
  00000000000005e8 r __FRAME_END__
  
  0000000000001fd8 d _GLOBAL_OFFSET_TABLE_
  
  0000000000000258 r ndk_build_number
  
  0000000000000218 r ndk_version
  
  0000000000000200 r note_android_ident
  
  0000000000000214 r note_data
  
  0000000000000298 r note_end
  
  000000000000020c r note_name
  
  00000000000004d0 t __on_dlclose
  
  00000000000004f0 t __on_dlclose_late

  and on libavformat :

  0000000000000520 t atexit
  
  0000000000000510 t __atexit_handler_wrapper
  
  0000000000002008 A __bss_start
  
                   U __cxa_atexit
  
                   U __cxa_finalize
  
  0000000000002000 d __dso_handle
  
  0000000000001dd8 d _DYNAMIC
  
  0000000000002008 A _edata
  
  00000000000004f0 t __emutls_unregister_key
  
  0000000000002008 A _end
  
  00000000000005f8 r __FRAME_END__
  
  0000000000001fd8 d _GLOBAL_OFFSET_TABLE_
  
  0000000000000258 r ndk_build_number
  
  0000000000000218 r ndk_version
  
  0000000000000200 r note_android_ident
  
  0000000000000214 r note_data
  
  0000000000000298 r note_end
  
  000000000000020c r note_name
  
  00000000000004e0 t __on_dlclose
  
  0000000000000500 t __on_dlclose_late

  UPDATE 2
  I applied @szatmary suggestion and finally managed to to build the apk file but upon reaching the System.loadLibrary call an exception occurs indicating that the linker can not find libavutil.so.56. I tried changing the address of the library in the cmake file to actually contain the version numbered lib file to no avail :

  java.lang.UnsatisfiedLinkError: dlopen failed: library "libavutil.so.56" not found
  
          at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
  
          at java.lang.System.loadLibrary(System.java:1657)
  
          at com.hmomeni.canto.activities.EditActivity.<init>(EditActivity.kt:26)
  
          at java.lang.Class.newInstance(Native Method)
  
          at android.app.Instrumentation.newActivity(Instrumentation.java:1174)
  
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)
  
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
  
          at android.app.ActivityThread.-wrap11(Unknown Source:0)
  
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
  
          at android.os.Handler.dispatchMessage(Handler.java:106)
  
          at android.os.Looper.loop(Looper.java:164)
  
          at android.app.ActivityThread.main(ActivityThread.java:6494)
  
          at java.lang.reflect.Method.invoke(Native Method)
  
          at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
  
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
  
  </init>

• Piwik awarded Gold Prize at Open Source Software World Challenge

  22 décembre 2014, par Matthieu Aubry — About

  We are excited to announce that Piwik has been awarded the Gold Prize in the Open Source Software World Challenge 2014 !

  

  Winning this award is a testament to the positive impacts of the Piwik platform worldwide. Every day dozens of new people are embracing Piwik to power their web and mobile analytics which gives them full control over their data.

  Every member of the Piwik community, from core developer to beginning user, should be proud to be part of this momentum : congratulations to us all !

  The Open Source World Challenge is the annual competition hosted by the Ministry of Science, ICT and Future Planning of Korea. This competition is mainly intended to promote open source software and expand various exchanges among open source software developers worldwide.

  

  Piwik Awards

• Piwik awarded Gold Prize at Open Source Software World Challenge

  22 décembre 2014, par Matthieu Aubry — About

  We are excited to announce that Piwik has been awarded the Gold Prize in the Open Source Software World Challenge 2014 !

  

  Winning this award is a testament to the positive impacts of the Piwik platform worldwide. Every day dozens of new people are embracing Piwik to power their web and mobile analytics which gives them full control over their data.

  Every member of the Piwik community, from core developer to beginning user, should be proud to be part of this momentum : congratulations to us all !

  The Open Source World Challenge is the annual competition hosted by the Ministry of Science, ICT and Future Planning of Korea. This competition is mainly intended to promote open source software and expand various exchanges among open source software developers worldwide.

  

  Piwik Awards