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• FFmpeg support for libstagefright hardware decoding

  25 février 2016, par Ming Zhang

  everyone :
  I am new to ffmpeg. Recently I am working on project to port ffmpeg to android device.
  At the beginning, I compiled ffmpeg to shared libs(.so files) in a very normal way following some guides on Internet, load them into my android app. It works perfectly.

  Now I want ffmpeg to use libstagefright to fulfill HW decoding.
  The problem is, I can compile the .so libs, but when I launch my app and load those .so libs, there is always a java.lang.UnsatisfiedLinkError :
  Cannot load library : reloc_library[1314] : 114 cannot locate ’_ZN7android11MediaBufferC1Ej’

  I stuck there for a few days. Does anyone encountered any similar problems before ? It would be great if someone can give me some hint about this error.

  My steps :
  1. Compile ffmpeg-2.1.4 souce code to .so shared libs. I use the build_libstagefright script to do this, and make some modification based on some guides from Internet.

  #!/bin/bash
  
  #export NDK=/home/mingzhang/android/android-ndk-r9c
  
  export NDK=/home/mingzhang/android/android-ndk-r7
  
  if [ "$NDK" = "" ]; then
  
      echo NDK variable not set, assuming ${HOME}/android-ndk
  
      export NDK=${HOME}/android-ndk
  
  fi
  
  
  
  echo "Fetching Android system headers"
  
  git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_base.git ../android-source/frameworks/base
  
  git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_av.git ../android-source/frameworks/av
  
  git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_native.git ../android-source/frameworks/native
  
  git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_hardware_libhardware.git ../android-source/hardware/libhardware
  
  git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_system_core.git ../android-source/system/core
  
  
  
  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 "../android-libs" ]; then
  
  #    if [ ! -f "../update-cm-7.0.3-N1-signed.zip" ]; then
  
  #        wget http://download.cyanogenmod.com/get/update-cm-7.0.3-N1-signed.zip -P../
  
  #    fi
  
  #    unzip ../update-cm-7.0.3-N1-signed.zip system/lib/* -d../
  
  #    mv ../system/lib ../android-libs
  
  #    rmdir ../system
  
  #fi
  
  
  
  SYSROOT=$NDK/platforms/android-9/arch-arm
  
  # Expand the prebuilt/* path into the correct one
  
  #TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64
  
  TOOLCHAIN=/home/mingzhang/android/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  ANDROID_SOURCE=../android-source
  
  ANDROID_LIBS=../android-libs
  
  ABI="armeabi-v7a"
  
  CC=$TOOLCHAIN/bin/arm-linux-androideabi-gcc
  
  #CC=$TOOLCHAIN/bin/arm-eabi-gcc-4.4.3
  
  NM=$TOOLCHAIN/bin/arm-linux-androideabi-nm
  
  #NM=$TOOLCHAIN/bin/arm-eabi-nm
  
  
  
  rm -rf ../build/stagefright
  
  mkdir -p ../build/stagefright
  
  
  
  ADDI_CFLAGS="-marm"
  
  DEST=../build/stagefright
  
  DEST="$DEST/$ABI"
  
  
  
  FLAGS="--target-os=linux --arch=arm --cpu=armv7-a --cross-prefix=arm-linux-androideabi- --cc=$CC --nm=$NM"
  
  #FLAGS="--target-os=linux --arch=arm --cpu=armv7-a --cross-prefix=arm-eabi- --cc=$CC --nm=$NM"
  
  FLAGS="$FLAGS --sysroot=$SYSROOT"
  
  #FLAGS="$FLAGS --disable-avdevice --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-libstagefright-h264"
  
  FLAGS="$FLAGS --enable-shared --disable-demuxers --disable-muxers --disable-parsers --disable-avdevice --disable-filters --disable-programs --disable-encoders --disable-decoders --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-decoder=libstagefright_h264 --enable-libstagefright-h264 \
  
      --enable-asm \
  
      --enable-neon \
  
      --enable-cross-compile \
  
      --enable-gpl \
  
      --disable-static \
  
      --enable-memalign-hack"
  
  
  
  EXTRA_CFLAGS="-I$DEST/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/base/include -I$ANDROID_SOURCE/system/core/include"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/hardware/libhardware/include"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/media/libstagefright"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/include/media/stagefright/openmax"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/gnu-libstdc++/4.6/include -I$NDK/sources/cxx-stl/gnu-libstdc++/4.6/libs/$ABI/include"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/stlport/stlport"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon -marm -mtune=cortex-a8"
  
  EXTRA_CFLAGS="$EXTRA_CFLAGS -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -D_STLP_USE_NEWALLOC"
  
  
  
  EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/4.6/libs/$ABI -static-libstdc++"
  
  EXTRA_CXXFLAGS="-Wno-multichar -fno-exceptions -fno-rtti"
  
  FLAGS="$FLAGS --prefix=$DEST"
  
  
  
  mkdir -p $DEST
  
  
  
  echo $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" > $DEST/info.txt
  
  ./configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" | tee $DEST/configuration.txt
  
  [ $PIPESTATUS == 0 ] || exit 1
  
  make clean
  
  #make -j4 || exit 1
  
  #make -j4
  
  make install || exit 1

  2. Copy the compiled include and lib directories to my android-ndk-r7/sources/ffmpeg-2.1.4/android/arm directory. The Android.mk file under this directory is.

     LOCAL_PATH := $(call my-dir)

     include $(CLEAR_VARS)
     LOCAL_MODULE := libavcodec
     LOCAL_SRC_FILES := lib/libavcodec-55.so
     LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
     include $(PREBUILT_SHARED_LIBRARY)

     include $(CLEAR_VARS)
     LOCAL_MODULE := libavformat
     LOCAL_SRC_FILES := lib/libavformat-55.so
     LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
     include $(PREBUILT_SHARED_LIBRARY)

     include $(CLEAR_VARS)
     LOCAL_MODULE := libswscale
     LOCAL_SRC_FILES := lib/libswscale-2.so
     LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
     include $(PREBUILT_SHARED_LIBRARY)

     include $(CLEAR_VARS)
     LOCAL_MODULE := libavutil
     LOCAL_SRC_FILES := lib/libavutil-52.so
     LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
     include $(PREBUILT_SHARED_LIBRARY)

     include $(CLEAR_VARS)
     LOCAL_MODULE := libavfilter
     LOCAL_SRC_FILES := lib/libavfilter-3.so
     LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
     include $(PREBUILT_SHARED_LIBRARY)

     include $(CLEAR_VARS)
     LOCAL_MODULE := libwsresample
     LOCAL_SRC_FILES := lib/libswresample-0.so
     LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
     include $(PREBUILT_SHARED_LIBRARY)

  3. Under the jni directory of my android app, the Android.mk is.

     LOCAL_PATH:= $(call my-dir)
     
     include $(CLEAR_VARS)
     
     
     
     LOCAL_MODULE    := libripple
     
     #LOCAL_CFLAGS    := -Werror
     
     LOCAL_SRC_FILES := entrypoint.cpp scene.cpp
     
     LOCAL_LDLIBS    := -llog -lGLESv2 -lm
     
     
     
     include $(BUILD_SHARED_LIBRARY)
     
     
     
     include $(CLEAR_VARS)
     
     
     
     LOCAL_MODULE    := myfflib
     
     LOCAL_SRC_FILES := fflib.c
     
     LOCAL_LDLIBS := -L/home/mingzhang/ffmpeg_android/android-libs -llog -ljnigraphics -lz -landroid -ldl -lm -llog -lgcc -lc -lstagefright -lmedia -lutils -lbinder #-lstdc++
     
     LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil libutils libstagefright libbinder libmedia libstdc++-6
     
     
     
     include $(BUILD_SHARED_LIBRARY)
     
     $(call import-module,ffmpeg-2.1.4/android/arm)

     And the Application.mk is :

     APP_ABI=armeabi-v7a
     
     #APP_STL=gnustl_static
     
     APP_STL=stlport_static

  I am not sure what else materials you need, if anything is missing, please let me know, I will upload it.
  Thank you guys very much !!!

• Problems compiling object using arm-linux-androideabi-gcc and android ndk

  24 septembre 2014, par shishir123

  I am trying to build FFmpeg source file using android ndk r8b version . My linux version is CentOs 6.5.I am following this instruction from this link https://github.com/yixia/FFmpeg-Android
  Here is bash script which is I am trying to execute

       #!/bin/bash
  
  
  
      DEST=`pwd`/build/ffmpeg && rm -rf $DEST
  
      SOURCE=`pwd`/ffmpeg
  
  
  
      if [ -d ffmpeg ]; then
  
        cd ffmpeg
  
      else
  
        git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg
  
        cd ffmpeg
  
      fi
  
  
  
      git reset --hard
  
      git clean -f -d
  
      git checkout `cat ../ffmpeg-version`
  
      patch -p1 <../FFmpeg-VPlayer.patch
  
      [ $PIPESTATUS == 0 ] || exit 1
  
  
  
      git log --pretty=format:%H -1 > ../ffmpeg-version
  
  
  
      TOOLCHAIN=/tmp/vplayer
  
      SYSROOT=$TOOLCHAIN/sysroot/
  
      $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-14 --install-     dir=$TOOLCHAIN
  
  
  
      export PATH=$TOOLCHAIN/bin:$PATH
  
      export CC=arm-linux-androideabi-gcc
  
      export LD=arm-linux-androideabi-ld
  
      export AR=arm-linux-androideabi-ar
  
  
  
      CFLAGS="-O3 -Wall -mthumb -pipe -fpic -fasm \
  
        -finline-limit=300 -ffast-math \
  
        -fstrict-aliasing -Werror=strict-aliasing \
  
        -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
        -Wno-psabi -Wa,--noexecstack \
  
        -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
        -DANDROID -DNDEBUG"
  
  
  
      FFMPEG_FLAGS="--target-os=linux \
  
        --arch=arm \
  
        --enable-cross-compile \
  
        --cross-prefix=arm-linux-androideabi- \
  
        --enable-shared \
  
        --disable-symver \
  
        --disable-doc \
  
        --disable-ffplay \
  
        --disable-ffmpeg \
  
        --disable-ffprobe \
  
        --disable-ffserver \
  
        --disable-avdevice \
  
        --disable-avfilter \
  
        --disable-encoders \
  
        --disable-muxers \
  
        --disable-filters \
  
        --disable-devices \
  
        --disable-everything \
  
        --enable-protocols  \
  
        --enable-parsers \
  
        --enable-demuxers \
  
        --enable-decoders \
  
        --enable-bsfs \
  
        --enable-network \
  
        --enable-swscale  \
  
        --disable-demuxer=sbg \
  
        --disable-demuxer=dts \
  
        --disable-parser=dca \
  
        --disable-decoder=dca \
  
        --enable-asm \
  
        --enable-version3"
  
  
  
  
  
      for version in neon armv7 vfp armv6; do
  
  
  
        cd $SOURCE
  
  
  
        case $version in
  
          neon)
  
            EXTRA_CFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad"
  
            EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
            ;;
  
          armv7)
  
            EXTRA_CFLAGS="-march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp"
  
            EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
            ;;
  
          vfp)
  
            EXTRA_CFLAGS="-march=armv6 -mfpu=vfp -mfloat-abi=softfp"
  
            EXTRA_LDFLAGS=""
  
            ;;
  
          armv6)
  
            EXTRA_CFLAGS="-march=armv6"
  
            EXTRA_LDFLAGS=""
  
            ;;
  
          *)
  
            EXTRA_CFLAGS=""
  
            EXTRA_LDFLAGS=""
  
            ;;
  
        esac
  
  
  
        PREFIX="$DEST/$version" && mkdir -p $PREFIX
  
        FFMPEG_FLAGS="$FFMPEG_FLAGS --prefix=$PREFIX"
  
  
  
        ./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-     ldflags="$EXTRA_LDFLAGS" | tee $PREFIX/configuration.txt
  
        cp config.* $PREFIX
  
        [ $PIPESTATUS == 0 ] || exit 1
  
  
  
        make clean
  
        make -j4 || exit 1
  
        make install || exit 1
  
  
  
        rm libavcodec/inverse.o
  
        $CC -lm -lz -shared --sysroot=$SYSROOT -Wl,--no-undefined -Wl,-z,noexecstack $EXTRA_LDFLAGS libavutil/*.o libavutil/arm/*.o libavcodec/*.o libavcodec/arm/*.o libavformat/*.o libswresample/*.o libswscale/*.o -o $PREFIX/libffmpeg.so
  
  
  
        cp $PREFIX/libffmpeg.so $PREFIX/libffmpeg-debug.so
  
        arm-linux-androideabi-strip --strip-unneeded $PREFIX/libffmpeg.so
  
  
  
      done

  Now i am getting this error ./FFmpeg-Android.sh: line 26: export:arm-linux-androideabi-gcc’ : not a valid identifier
  arm-linux-androideabi-gcc is unable to create an executable file.
  C compiler test failed.`

  The code in 26 number line is export CC=arm-linux-androideabi-gcc any idea why the problem is happening ?? a help would be appreciated .

• HLS MPEG-TS metadata stream using FFMPEG

  20 janvier 2015, par Ramesh Prasad

  I want to create mpeg ts segment for HLS streaming. The ts should contain metadata as a separate stream as shown below-

  **Stream #0:0**[0x102]: Data: timed_id3 (ID3  / 0x20334449) 
  
  **Stream #0:1**[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 426x240, 25 fps, 25 tbr, 90k tbn, 6k tbc
  
  **Stream #0:2**[0x101]: Audio: aac ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 98 kb/s

  I am using ffmpeg and have tried various option. I get the following ts structure-

  **service_name**    : Service01
  
  **service_provider**: FFmpeg
  
  **Stream #0:0[0x100]**: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x576 [SAR 1:1 DAR 5:4], max. 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  **Stream #0:1[0x101]**: Audio: mp2 ([3][0][0][0] / 0x0003), 16000 Hz, mono, s16p, 143 kb/s

  using the following command-

  ffmpeg -i news.ts -t 10 -metadata:s:v:0 TITLE="Some Provider" -id3v2_version 4 -write_id3v1 1 segid3.ts

  How to get the metadata as a separate stream in the ts file using ffmpeg ?