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• Compiling ffmpeg for Android using Linux

  1er juillet 2015, par VEP10

  I’d like to test the ijkplayer for android project according to this :
  https://github.com/bbcallen/ijkplayer/blob/master/README.md
  When I am compiling the ffmpeg (./compile-ffmpeg.sh) at the "configurate ffmpeg" phase I get the following message : arm-linux-androideabi-gcc is unable to create an executable file. C compiler test failed.
  This part of the compile-ffmpeg.sh file :

  echo "\n--------------------"
  
  echo "[*] configurate ffmpeg"
  
  echo "--------------------"
  
  cd $FF_SOURCE
  
  if [ -f "./config.h" ]; then
  
      echo 'reuse configure'
  
  else
  
      ./configure $FF_CFG_FLAGS \
  
          --extra-cflags="$FF_CFLAGS $FF_EXTRA_CFLAGS" \
  
          --extra-ldflags="$FF_DEP_LIBS $FF_EXTRA_LDFLAGS"
  
      make clean
  
  fi 

  At the end of the config.log file I found the problem :

  zoompan_filter_deps='swscale'
  
  WARNING: arm-linux-androideabi-pkg-config not found, library detection may fail.
  
  mktemp -u XXXXXX
  
  tHt73A
  
  check_ld cc
  
  check_cc
  
  BEGIN /tmp/ffconf.mvjZdW0f.c
  
      1   int main(void){ return 0; }
  
  END /tmp/ffconf.mvjZdW0f.c
  
  arm-linux-androideabi-gcc -O3 -Wall -pipe -std=c99 -ffast-math -fstrict aliasing -Werror=strict-aliasing -Wno-psabi -Wa,--noexecstack -DANDROID -DNDEBUG -march=armv7-a -mcpu=cortex-a8 -mfpu=vfpv3-d16 -mfloat-abi=softfp -mthumb -mcpu=cortex-a8 -c -o /tmp/ffconf.ZKAEl7Bh.o /tmp/ffconf.mvjZdW0f.c
  
  as: unrecognized option '-mcpu=cortex-a8'
  
  C compiler test failed.

  I am sure that the assembler knows the cortex-a8 cpu option. The problem is anywhere else.

  Environment :

  Ubuntu 14.04

  NDK : r10e

  arm-linux-androideabi-4.8

  gcc-4.6

  Please help !

• compile FFMpeg for Android (Ubuntu14) - cannot locate symbol

  11 mai 2015, par unichiduci

  I’m trying to compile FFMpeg for Android and I have troubles running the APK on Android 4 (on Android 5 I don’t get this shitty unsatisfied link error) :

  05-09 15:16:18.880  22160-22304/com.gpac.Osmo4 I/LibrariesLoader﹕ Loading library avcodec...
  
  05-09 15:16:18.910  22160-22304/com.gpac.Osmo4 E/dalvikvm﹕ dlopen("/data/app-lib/com.gpac.Osmo4-1/libavcodec.so") failed: Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "log2f" referenced by "libavcodec.so"...
  
  05-09 15:16:18.920  22160-22304/com.gpac.Osmo4 E/LibrariesLoader﹕ Failed to load library : avcodec due to link error Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "log2f" referenced by "libavcodec.so"...
  
      java.lang.UnsatisfiedLinkError: Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "log2f" referenced by "libavcodec.so"...

  I’m using NDK 10d, toolchain 4.9 but I was trying with NDK 8 and 9 also and I was getting the same result.
  The only difference when I compile with older NDK versions is that I get a warning message :

  incompatible declaration of built-in function log2f

  I checked libm.so (where log2f should be) which is on the target device and of course there is no log2f function defined there but replacing the library by hand probably would crash some other stuff + I need to root the phone.

  I know this is a linker issue and it should not be that hard to fix but I ran out of ideas.

  EDIT :
  I’m trying to compile ffmpeg 2.4.3
  The script that I’m using to configure :

  #!/bin/bash
  
  
  
  if [ "$NDK" = "" ]; then
  
      echo NDK variable not set, assuming ${HOME}/android-ndk
  
      export NDK=${HOME}/android-ndk
  
  fi
  
  
  
  echo "Compiling with NDK located at: $NDK"
  
  
  
  ROOT_DIR=`cd ..; pwd`
  
  CUR_DIR=`pwd`
  
  
  
  echo "Fetching Android system headers"
  
  if [ ! -d "$ROOT_DIR/android-source/frameworks/base" ]; then
  
      git clone --depth=1 --branch cm-11.0 https://github.com/CyanogenMod/android_frameworks_base.git "$ROOT_DIR/android-source/frameworks/base"
  
  fi
  
  if [ ! -d "$ROOT_DIR/android-source/system/core" ]; then
  
      git clone --depth=1 --branch cm-11.0 https://github.com/CyanogenMod/android_system_core.git "$ROOT_DIR/android-source/system/core"
  
  fi
  
  if [ ! -d "$ROOT_DIR/android-source/frameworks/av" ]; then
  
      git clone --depth=1 --branch cm-11.0 https://github.com/CyanogenMod/android_frameworks_av "$ROOT_DIR/android-source/frameworks/av"
  
  fi
  
  if [ ! -d "$ROOT_DIR/android-source/hardware/libhardware" ]; then
  
      git clone --depth=1 --branch cm-11.0 https://github.com/CyanogenMod/android_hardware_libhardware.git "$ROOT_DIR/android-source/hardware/libhardware"
  
  fi
  
  if [ ! -d "$ROOT_DIR/android-source/frameworks/native" ]; then
  
      git clone --depth=1 --branch cm-11.0 https://github.com/CyanogenMod/android_frameworks_native.git "$ROOT_DIR/android-source/frameworks/native"
  
  fi
  
  
  
  echo "Fetching Android libraries for linking"
  
  # Libraries from any froyo/gingerbread device/emulator should work
  
  # fine, since the symbols used  should be available on most of them.
  
  if [ ! -d "$ROOT_DIR/android-libs" ]; then
  
      wget http://download.cyanogenmod.org/get/jenkins/65493/cm-10.2.1.3-serranoltexx.zip -P../
  
      unzip ../cm-10.2.1.3-serranoltexx.zip system/lib/* -d../
  
      mv ../system/lib "$ROOT_DIR/android-libs"
  
      rmdir ../system
  
      rm ../cm-10.2.1.3-serranoltexx.zip
  
  fi
  
  
  
  ANDROID_SOURCE="$ROOT_DIR/android-source"
  
  echo "ANDROID_SOURCE: $ANDROID_SOURCE"
  
  ANDROID_LIBS="$ROOT_DIR/android-libs"
  
  OBJS="$ROOT_DIR/objs"
  
  if [ "$DEST" = "" ]; then
  
      rm -rf $ROOT_DIR/build/stagefright
  
      mkdir -p $ROOT_DIR/build/stagefright
  
      DEST=$ROOT_DIR/build/stagefright
  
  fi
  
  
  
  #for ABI in "armeabi-v7a" "armeabi" "x86"; do
  
  for ABI in "armeabi-v7a" "armeabi"; do
  
      if [ "$ABI" = "x86" ]; then
  
          ARCH="x86"
  
          TOOLCHAIN=`echo $NDK/toolchains/x86-4.9/prebuilt/*-x86*`
  
      else
  
          ARCH="arm"
  
          TOOLCHAIN=`echo $NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/*-x86*`
  
      fi 
  
      SYSROOT=$NDK/platforms/android-18/arch-$ARCH
  
      # Expand the prebuilt/* path into the correct one
  
      export PATH=$TOOLCHAIN/bin:$PATH
  
  
  
      FLAGS="--target-os=linux --arch=$ARCH"
  
      FLAGS="$FLAGS --sysroot=$SYSROOT"
  
      FLAGS="$FLAGS --enable-shared --disable-doc --disable-ffplay --disable-ffprobe --disable-ffserver --disable-symver"
  
      if [ "$ARCH" = "arm" ]; then
  
          FLAGS="$FLAGS --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- --cpu=armv7-a --enable-libstagefright-h264"
  
          #FLAGS="$FLAGS --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- --cpu=armv7-a"
  
      else
  
          FLAGS="$FLAGS --cross-prefix=$TOOLCHAIN/bin/i686-linux-android- --disable-asm"
  
      fi
  
  
  
      EXTRA_CFLAGS="-I$DEST/$ABI/include"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/include -I$ANDROID_SOURCE/system/core/include"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/native/include"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/native/include/media/openmax"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/av/include"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/av/media/libstagefright"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/gnu-libstdc++/4.9/include -I$NDK/sources/cxx-stl/gnu-libstdc++/4.9/libs/$ABI/include"
  
      EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/hardware/libhardware/include"
  
      if [ "$ARCH" = "arm" ]; then
  
          EXTRA_CFLAGS="$EXTRA_CFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon -Wl,--no-undefined" #-Werror=implicit-function-declaration"
  
      fi
  
      EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/4.9/libs/$ABI"
  
      EXTRA_CXXFLAGS="-Wno-multichar -fno-exceptions -fno-rtti"
  
      FLAGS="$FLAGS --prefix=$DEST/$ABI"
  
  
  
      mkdir -p $DEST/$ABI
  
      mkdir -p $OBJS/$ABI
  
  
  
      echo $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" > $DEST/$ABI/info.txt
  
      echo "Configuring ..."
  
      cd $OBJS/$ABI
  
      $ROOT_DIR/configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" | tee $DEST/$ABI/configuration.txt
  
      [ $PIPESTATUS == 0 ] || exit 1
  
      echo "Making ..."
  
      #make clean
  
      make -j4 || exit 1
  
      make install || exit 1
  
      cd $CUR_DIR
  
  done

• How do I set a relative path for an .SO file ?

  1er juillet 2015, par Eran Boudjnah

  This is my error :

  06-29 16:52:37.729 24144-24144/com.my.app E/AndroidRuntime﹕ FATAL
  EXCEPTION : main
  Process : com.my.app, PID : 24144
  java.lang.UnsatisfiedLinkError : dlopen failed : could not load library "build/obj/local/armeabi/libavformat.so" needed by
  "libFFmpegWrapper.so" ; caused by library
  "build/obj/local/armeabi/libavformat.so" not found

  build/obj/local/armeabi/libavformat.so looks wrong to me. The code worked with an earlier build of ffmpeg - so I suspect it’s something to do with the way I build ffmpeg.

  The libavformat.so file is in the APK where I’d expect it to be.

  This is my build script for ffmpeg :

  #!/bin/bash
  
  
  
  NDK=/Users/eran/Downloads/android-ndk-r10e
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
  
  PLATFORM=$NDK/platforms/android-12/arch-arm
  
  PREFIX=/usr/local
  
  
  
  function build_one
  
  {
  
    ./configure --target-os=android --prefix=$PREFIX \
  
    --pkg-config=./fake-pkg-config \
  
    --enable-cross-compile \
  
    --cpu=armv7-a \
  
    --enable-shared \
  
    --disable-static \
  
    --disable-asm \
  
    --arch=arm \
  
    --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
    --disable-stripping \
  
    --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
    --sysroot=$PLATFORM \
  
    --disable-nonfree \
  
    --disable-version3 \
  
    --disable-everything \
  
    --enable-gpl \
  
    --disable-doc \
  
    --enable-avresample \
  
    --disable-demuxer=rtsp \
  
    --disable-muxer=rtsp \
  
    --disable-ffplay \
  
    --disable-ffserver \
  
    --enable-ffmpeg \
  
    --disable-ffprobe \
  
    --enable-libx264 \
  
    --enable-encoder=libx264 \
  
    --enable-decoder=h264 \
  
    --disable-protocol=rtp \
  
    --enable-hwaccels \
  
    --enable-zlib \
  
    --disable-devices \
  
    --disable-avdevice \
  
    --extra-cflags="-I/usr/local/include -fPIC -DANDROID -Wno-deprecated -mfloat-abi=softfp -mfpu=neon -march=armv7-a" \
  
    --extra-ldflags="-L/usr/local/lib -Wl,--fix-cortex-a8" \
  
    --extra-cxxflags='-Wno-multichar -fno-exceptions -fno-rtti'
  
    make -j4 install
  
  }
  
  
  
  build_one