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• Adding prebuild static library to android studio

  24 mars 2017, par David Barishev

  I have build ffmpeg libraries statically for x86 android using a custom configuration.Now i wanted to add them in my android project.

  Im using ffmpeg 3.2.git, android studio 2.3.

  I created a folder named distribution which had my binaries, located the root of my project.
  Here is a file tree :

  |__distribution
  
  | |__avcodec
  
  | | |__include
  
  | | | |__avcodec.h
  
  | | |__lib
  
  | | | |__x86
  
  | | | | |__libavcodec.a
  
  | |__avfilter
  
  | | |__include
  
  | | | |__avfilter.h
  
  | | |__lib
  
  | | | |__x86
  
  | | | | |__libavfilter.a
  
  | |__avformat
  
  | | |__include
  
  | | | |__avformat.h
  
  | | |__lib
  
  | | | |__x86
  
  | | | | |__libavformat.a
  
  | |__avutil
  
  | | |__include
  
  | | | |__avutil.h
  
  | | |__lib
  
  | | | |__x86
  
  | | | | |__libavutil.a
  
  | |__swresample
  
  | | |__include
  
  | | | |__swresample.h
  
  | | |__lib
  
  | | | |__x86
  
  | | | | |__libswresample.a

  I edited my cmake to include the libraries :

  add_library(
  
           native-lib
  
           SHARED
  
           src/main/cpp/native-lib.cpp )
  
  
  
  set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution)
  
  
  
  add_library(lib_avcodec STATIC IMPORTED)
  
  set_target_properties(lib_avcodec PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/avcodec/lib/${ANDROID_ABI}/libavcodec.a)
  
  
  
  add_library(lib_avfilter STATIC IMPORTED)
  
  set_target_properties(lib_avfilter PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/avfilter/lib/${ANDROID_ABI}/libavfilter.a)
  
  
  
  add_library(lib_avformat STATIC IMPORTED)
  
  set_target_properties(lib_avformat PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/avformat/lib/${ANDROID_ABI}/libavformat.a)
  
  
  
  add_library(lib_avutil STATIC IMPORTED)
  
  set_target_properties(lib_avutil PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/avutil/lib/${ANDROID_ABI}/libavutil.a)
  
  
  
  add_library(lib_swresample STATIC IMPORTED)
  
  set_target_properties(lib_swresample PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/swresample/lib/${ANDROID_ABI}/libswresample.a)
  
  
  
  
  
  
  
  include_directories(
  
                             ${distribution_DIR}/avcodec/include
  
                             ${distribution_DIR}/avfilter/include
  
                             ${distribution_DIR}/avformat/include
  
                             ${distribution_DIR}/avutil/include
  
                             ${distribution_DIR}/swresample/include)
  
  
  
  
  
  target_link_libraries( 
  
                         native-lib
  
  
  
                         lib_avcodec
  
                         lib_avfilter
  
                         lib_avformat
  
                         lib_avutil
  
                         lib_swresample
  
                          )

  I also restricted the build to only x86, in my app build.gradle :

  ndk {
  
              // Specifies the ABI configurations of your native
  
              // libraries Gradle should build and package with your APK.
  
              abiFilters 'x86'
  
      }

  The project gradle sync worked successfully.
  I edited my cpp file to try to use the libraries, and i noticed something weird,i couldn’t reference the headers with the library beforehand, only the header name itself (eg. #include "libavformat/avformat.h" doesn’t work, #include "avformat.h" works).
  I suspect this is because of the headers reference, that they are not tied to a library.
  How can i fix it ?

  Also this makes the project build fail, since in the static libraries headers, there is a reference to other part of the library (eg avformat includes avcodec),but they reference it with the library name beforehand, and as i have said earlier, it doesn’t work.

  Here is the relevant build log part :

  ../../../../../distribution/avformat/include\avformat.h:319:10: fatal error: 'libavcodec/avcodec.h' file not found
  
    #include "libavcodec/avcodec.h"
  
             ^

• How to link and call function of prebuild static native library from android studio

  23 janvier 2017, par Janaki

  I need to change pitch and time stretching of an audio. For this I am using prebuild static library. Currently I am having libZtxAndroid.a static library and corresponding header file which contains function declaration. But I don’t know how to load this library in my android studio app and call native function from java code. I explored many links and tried to load this library. But all attempts are failed. This is the one link which I have tried last time https://tariqzubairy.wordpress.com/2012/03/12/use-of-prebuild-static-library-compiled-with-android-toolchain/

  Also I am using FFMPEG shared library and MP4Parser (https://github.com/sannies/mp4parser) library in this app for adding water mark to video and merging audio respectively. Can any one help from basics.

  1. How to load static library ?
  2. Where I need to place that static library ?
  3. Where I need to create jni folder (folder structure) ?
  4. How to call function available in that static library with the help of header file from java code ?

• cannot load library : reloc_library[1306] : 249 cannot locate 'atof'... when loading avformat.so in Android

  4 novembre 2016, par mdang

  I am using Android Studio 2.2 and try to link ffmpeg libraries to run on Android 4.1.2 device. When loading the avformat library, I get the error

  "cannot load library: reloc_library[1306]: 249 cannot locate 'atof'..."

  Below is a link that points out that if an app is built with SDK version 21 and above will have this issue when running on devices with older Android version (SDK version < 19).

  Cannot load library : reloc_library[1285] : cannot locate ’rand’

  I changed the targetSdkVersion to 19 in my build.gradle and built ffmpeg libraries with "android-16" target, and still get the error.

  I wonder if anyone has similar issue and found a way to make it work. Thanks.