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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>

• avcodec/h264, videotoolbox : do not return invalid frames on failure

  20 novembre 2015, par wm4

  avcodec/h264, videotoolbox : do not return invalid frames on failure
  If videotoolbox_common_end_frame failed, then the AVFrame was returned
  
  to the API user with the dummy buffer (in AVFrame.buf[0]) still set, and
  
  the decode call indicating success.
  These "half-set" AVFrames with dummy buffer are a videotoolbox specific
  
  hack, because the decoder requires an allocated AVFrame for its internal
  
  logic. Videotoolbox on the other hand allocates its frame itself
  
  internally, and outputs it only on end_frame. At this point, the dummy
  
  buffer is replaced with the real frame (unless decoding fails).
  

  • [DH] libavcodec/h264_refs.c
  • [DH] libavcodec/videotoolbox.c

• C# - Discord.Net - Trying to read audio from soundcloud and transmit it to discord

  28 mars 2022, par Bruno Braga

  I am currently working on a discord bot that is able to play a song using soundcloud.
Unfortunately, I can't seem to figure out how to get it to read from the url and stream it !
The bot it made in C#, and uses Discord.net library and ffmpeg for the audio.
Would love to hear some suggestions !

  


  These are the three functions involved :

  


  [Command("teste", RunMode = RunMode.Async)]
public async Task Play(IVoiceChannel channel = null)
{
    var audioClient = await JoinChannel(channel);
    var url = "https://soundcloud.com/campatechlive/campatech-live-feat- 
        matheus-moussa-arabian-system-vol-2-psy-trance-150-original-mix";

    var ffmpeg = new Ffmpeg(audioClient);
    await ffmpeg.SendAsync(url);
}

public async Task SendAsync(string path)
{
    using (var ffmpeg = CreateStream(path))
    using (var output = ffmpeg.StandardOutput.BaseStream)
    using (var discord = _client.CreatePCMStream(AudioApplication.Mixed))
    {
        try { await output.CopyToAsync(discord); }
        finally { await discord.FlushAsync(); }
    }
}

private Process? CreateStream(string path)
{
    return Process.Start(new ProcessStartInfo
    {
        FileName = "ffmpeg",
        Arguments = $"-hide_banner -loglevel panic -i \"{path}\" -ac 2 -f 
        s16le -ar 48000 pipe:1",
        UseShellExecute = false,
        RedirectStandardOutput = true,
    });
}


  


  I'm guessing it's something on the ffmpeg arguments, but can't kind of figure out what.

  


  I've tried a bunch of different arguments on ffmpeg, but none of them worked.
Anyone can lend me a hand ?