編譯android 硬解碼支持庫 libstagefright

最近花了一天時間將ffmpeg/tools/build_stagefright執行成功，主要是交叉編譯所需要的各種動態庫的支持沒鏈接上，導致各種報錯，基本上網絡上問到的問題我都碰到了，特此記錄下來。

編譯環境：Ubuntu 14.04 + Android NDK + FFmpeg源碼。

第一步：將ffmpeg/tools/build_stagefright移動到ffmpeg下面，修改執行權限。

chmod u+x build_stagefright

第二步：打開build_stagefright文件，配置Android NDK路徑。

#!/bin/bash  
export NDK=/to/your/ndk/path
if [ "$NDK" = "" ]; then  
    echo NDK variable not set, assuming ${HOME}/android-ndk-r8d  
    export NDK=${HOME}/android-ndk-r8d  
fi

第三步：build_stagefright中的下載地址http://download.cyanogenmod.com/get/update-cm-7.0.3-N1-signed.zip失效了，所以得手動下載update-cm-7.0.3-N1-signed.zip，附一個可以下載的地址http://sourceforge.net/projects/nexusoneandroid/files/update-cm-7.0.3-N1-signed.zip/stats/timeline

 

第四步：修改TOOLCHAIN=`echo $NDK/toolchains/arm-linux-androideabi-4.3.3/prebuilt/*-x86 ` 爲 TOOLCHAIN=`echo $NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64 ` ，否則會出現arm-linux-androideabi-gcc is unable to create an executable file. C compiler test failed.這樣的錯誤

 

第五步：vim configure 將enabled libstagefright_h264  && require_cpp libstagefright_h264 改爲 enabled libstagefright && require_cpp libstagefright_h264，否則會出現ERROR: libstagefright_h264 not found

 

第六步：將build_stagefright中的EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/gnu-libstdc++/include -I$NDK/sources/cxx-stl/gnu-libstdc++/libs/$ABI/include"改爲EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK/sources/cxx-stl/gnu-libstdc++/4.8/include -I$NDK/sources/cxx-stl/gnu-libstdc++/4.8/libs/$ABI/include"

 

第七步：將build_stagefright中的EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/libs/$ABI"更改爲EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/4.8/libs/$ABI"

 

第八步：將build_stagefright中的EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/libs/$ABI"繼續修改添加交叉編譯所需要的外部庫。最終修改爲：

EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/4.8/libs/$ABI -lstagefright     -lstdc++ -lutils -lbinder -lgnustl_static -lgnustl_shared"

第八步能解決大多數交叉編譯沒有鏈接相應的庫導致的問題。

最終修改完成的build_stagefright內容如下：

#!/bin/bash

export NDK=$ANDROID_NDK

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_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=`echo $NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64`
export PATH=$TOOLCHAIN/bin:$PATH
ANDROID_SOURCE=../android-source
ANDROID_LIBS=../android-libs
ABI="armeabi-v7a"

rm -rf ../build/stagefright
mkdir -p ../build/stagefright

DEST=../build/stagefright
FLAGS="--target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --cpu=armv7-a"
FLAGS="$FLAGS --sysroot=$SYSROOT"
FLAGS="$FLAGS --disable-avdevice --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-libstagefright-h264"

EXTRA_CFLAGS="-I$ANDROID_SOURCE/frameworks/base/include -I$ANDROID_SOURCE/system/core/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++/4.8/include -I$NDK/sources/cxx-stl/gnu-libstdc++/4.8/libs/$ABI/include"

EXTRA_CFLAGS="$EXTRA_CFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon"
EXTRA_LDFLAGS="-Wl,--fix-cortex-a8 -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS -L$NDK/sources/cxx-stl/gnu-libstdc++/4.8/libs/$ABI -lstagefright -lstdc++ -lutils -lbinder -lgnustl_static -lgnustl_shared"
#EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lcutils -ldl -lstlport -lc -lm -lz -ldl -llog -lstdc++ -lstagefright -lbinder  -lstlport -lstdc++ -lstl"
EXTRA_CXXFLAGS="-Wno-multichar -fno-exceptions -fno-rtti"
DEST="$DEST/$ABI"
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

第九步，執行./build_stagefright編譯,最終輸出如下內容則表示編譯成功：

CC    ffprobe.o
CC    ffserver.o
AR    libavfilter/libavfilter.a
AR    libavformat/libavformat.a
AR    libavcodec/libavcodec.a
AR    libswresample/libswresample.a
AR    libswscale/libswscale.a
AR    libavutil/libavutil.a
HOSTLD    doc/print_options
GENTEXI    doc/avoptions_format.texi
GENTEXI    doc/avoptions_codec.texi
POD    doc/ffmpeg.pod
POD    doc/ffprobe.pod
POD    doc/ffserver.pod
POD    doc/ffmpeg-all.pod
POD    doc/ffprobe-all.pod
POD    doc/ffserver-all.pod
POD    doc/ffmpeg-utils.pod
POD    doc/ffmpeg-scaler.pod
POD    doc/ffmpeg-resampler.pod
POD    doc/ffmpeg-codecs.pod
POD    doc/ffmpeg-bitstream-filters.pod
POD    doc/ffmpeg-formats.pod
POD    doc/ffmpeg-protocols.pod
POD    doc/ffmpeg-filters.pod
POD    doc/libavutil.pod
POD    doc/libswscale.pod
POD    doc/libswresample.pod
POD    doc/libavcodec.pod
POD    doc/libavformat.pod
POD    doc/libavfilter.pod
MAN    doc/ffmpeg.1
MAN    doc/ffprobe.1
MAN    doc/ffserver.1
MAN    doc/ffmpeg-all.1
MAN    doc/ffprobe-all.1
MAN    doc/ffserver-all.1
MAN    doc/ffmpeg-utils.1
MAN    doc/ffmpeg-scaler.1
MAN    doc/ffmpeg-resampler.1
MAN    doc/ffmpeg-codecs.1
MAN    doc/ffmpeg-bitstream-filters.1
MAN    doc/ffmpeg-formats.1
MAN    doc/ffmpeg-protocols.1
MAN    doc/ffmpeg-filters.1
MAN    doc/libavutil.3
MAN    doc/libswscale.3
MAN    doc/libswresample.3
MAN    doc/libavcodec.3
MAN    doc/libavformat.3
MAN    doc/libavfilter.3
LD    ffmpeg_g
LD    ffprobe_g
LD    ffserver_g
CP    ffprobe
CP    ffmpeg
STRIP    ffprobe
STRIP    ffmpeg
CP    ffserver
STRIP    ffserver