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• Using and building FFMPEG library in Android Studio(Cmake)

  8 septembre 2017, par y3k00000

  As title, I’m trying to use the ffmpeg source code as library in Android Studio on Ubuntu Linux, but meeting some trouble in compilation stage. I think I must be missing some compile option but having no idea what I miss, can somebody lend a hand ?

  My codes & settings are below :

  A simple auto-generated .cpp

  #include 
  
  #include <string>
  
  #include "libavcodec/aacenc.h"
  
  
  
  extern "C"
  
  JNIEXPORT jstring JNICALL
  
  Java_y3k_testffmpegnative_MainActivity_stringFromJNI(
  
          JNIEnv *env,
  
          jobject /* this */) {
  
      std::string hello = "Hello from C++";
  
      return env->NewStringUTF(hello.c_str());
  
  }
  
  
  
  AACEncContext * aacEncContext; // Just trying by adding this.
  
  </string>

  I’ve tried these Gradle setting and it didn’t help :

  android {
  
      ....
  
      externalNativeBuild {
  
          cmake {
  
              arguments "-DANDROID_TOOLCHAIN=clang"
  
              cFlags "-std=c99"
  
              cppFlags "-frtti","-fexceptions"
  
          }
  
      }
  
  }
  
  ....

  CMakeLists.txt

  (Android Studio generated)
  
  ....
  
  include_directories( /home/y3k/ffmpeg )

  Error message while compiling :

  /home/y3k/ffmpeg/libavutil/float_dsp.h
  
  Error:(164, 50) error: expected ')'
  
  Information:(164, 30) to match this '('
  
  Error:(164, 50) error: expected ')'
  
  Information:(164, 30) note: to match this '('
  
  /home/y3k/ffmpeg/libavutil/fixed_dsp.h
  
  Error:(153, 44) error: expected ')'
  
  Information:(153, 30) to match this '('
  
  Error:(153, 44) error: expected ')'
  
  Information:(153, 30) note: to match this '('
  
  /home/y3k/ffmpeg/libavcodec/mpeg4audio.h
  
  Error:(44, 8) error: unknown type name 'av_export'
  
  Error:(44, 18) error: expected unqualified-id
  
  Error:(44, 8) error: unknown type name 'av_export'
  
  Error:(44, 18) error: expected unqualified-id
  
  /home/y3k/ffmpeg/libavcodec/aac.h
  
  Error:(294, 21) error: expected member name or ';' after declaration specifiers
  
  Error:(294, 21) error: expected member name or ';' after declaration specifiers

  FFMpeg config.h generated by this script :

  NDK=/home/y3k/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-23/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
   --prefix=$PREFIX \
  
   --disable-shared \
  
   --enable-static \
  
   --disable-doc \
  
   --disable-ffmpeg \
  
   --disable-ffplay \
  
   --disable-ffprobe \
  
   --disable-ffserver \
  
   --disable-avdevice \
  
   --disable-doc \
  
   --disable-symver \
  
   --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
   --target-os=linux \
  
   --arch=arm \
  
   --enable-cross-compile \
  
   --sysroot=$SYSROOT \
  
   --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
   --extra-ldflags="$ADDI_LDFLAGS" \
  
   $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  By tracing the errors I found these lines :

  in float_dsp.h, fixed_dsp.h :

  void (*butterflies_float)(float *av_restrict v1, float *av_restrict v2, int len);

  av_restrict defined in config.h

  #define av_restrict restrict

  in aac.h :

  ....
  
  struct AACContext {
  
      AVClass        *class;
  
  ....

  in mpeg4audio.h :

  extern av_export const int avpriv_mpeg4audio_sample_rates[16];

  So I’m guessing it’s because the compiler misrecognized the C code as C++, I tried adding these :

  arguments "-DANDROID_TOOLCHAIN=clang"
  
  cFlags "-std=c99"

  to my build.gradle but didn’t help. Having no idea where to move on. :(

  I’m using the latest stable version of Android Studio on Ubuntu desktop. Please don’t be hesitate to ask if any extra information is required.

  Also I’ve been tried edit my native-lib.cpp into .c (Surely with the code contents changed), but wasn’t working either.

  Appreciate for any help.

• How to display a progress bar while the Android ffmpeg command is executing in android studio ?

  23 juillet 2017, par Hemanth Kumar

  I’m having troubles displaying a progress bar that shows kb/s or a percentage like 1-100% when the ffmpeg command is executing.

  Here I’m doing video trimming using the ffmpeg command.
  I’m developing code in Android Studio.
  I want to display a progress bar to the user when the process is going on but I
  can’t do it.

  Please tell me how to extract process information from the ffmpeg command and display it using a progress bar.

• how to build ffmpeg 3.2 for android studio 2.2

  1er novembre 2016, par mdang

  I am trying to build and use ffmpeg for Android. My Andoid Studio version is 2.2.2 and ffmpeg is 3.2. Following Android documentation on how to import rebuild library, I think I got the setting right but kept on getting this error

  ninja: error: 'avcodec-NOTFOUND', needed by '../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/...

  This is the setting

  add_library( avcodec SHARED IMPORTED )
  
  add_library( avdevice SHARED IMPORTED )
  
  add_library( avfilter SHARED IMPORTED )
  
  add_library( avformat SHARED IMPORTED )
  
  add_library( avutil SHARED IMPORTED )
  
  add_library( swscale SHARED IMPORTED )
  
  
  
  set_target_properties( avcodec
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          lib/ffmpeg/${ANDROID_ABI}/lib/libavcodec.so
  
                          )
  
  set_target_properties(  avdevice
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavdevice.so
  
                          )
  
  set_target_properties( avfilter
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          lib/ffmpeg/${ANDROID_ABI}lib/libavfilter.so
  
                          )
  
  set_target_properties( avformat
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavformat.so
  
                          )
  
  set_target_properties( avutil
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavutil.so
  
                          )
  
  set_target_properties( swscale
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libswscale.so
  
                          )
  
  
  
  # Specifies a path to native header files.
  
  include_directories(
  
                      libs/ffmpeg/${ANDROID_ABI}/include
  
                      )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                         native-lib
  
  
  
                         # Links the target library to the log library
  
                         # included in the NDK.
  
                         avcodec avdevice avfilter avformat avutil swscale
  
                         ${log-lib}
  
                          )

  If I specify the full library name, libavcodec.so..., the error would go away.

  target_link_libraries( # Specifies the target library.
  
                         native-lib
  
  
  
                         # Links the target library to the log library
  
                         # included in the NDK.
  
                         libavcodec.so libavdevice.so libavfilter.so libavformat.so libavutil.so libswscale.so
  
                         ${log-lib}
  
                          )

  I wonder if anyone encountered similar issue or know why the compilation behaves this way.