FFMpeg编译打包libffmeg.so总结

一、基于FFMpeg应用开发流程

首先我们根据自己项目需要，来对FFmpeg源码进行功能裁剪以减小最后APK的大小。编译好FFmpeg库后再添加自己的C、C++代码来使用FFmpeg库来实现相应的音视频编解码功能。再编写make文件将我们编写的C、C++代码打包成so库。最后就可创建Android应用工程编写java代码及JNI代码。在JNI代码中调用我们提供的C、C++接口。
下面引用雷神的一张图片来概括Android应用程序使用FFmpeg类库的流程

二、编译打包libffmpeg so库

1、下载安装NDK

android-ndk-r10e-linux-x86_64.zip

2、下载FFmpeg源码，修改FFmpeg的configure

首先我们将FFmpeg源码下载下来，这里提供我亲测编译通过的源码地址：
ffmpeg-3.1.3.tar.gz
下载FFmpeg源代码之后，首先需要对源代码中的configure文件进行修改。由于编译出来的动态库文件名的版本号在.so之后（例如“libavcodec.so.5.100.1”），而android平台不能识别这样文件名，所以需要修改这种文件名。在configure文件中找到下面几行代码：

SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR)$(SLIBNAME)'

替换为下面内容即可：

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'

3、生成类库

按照configure、make、make install的步骤就可以得到FFmpeg的头文件和类库文件了。下面看一下build_android_allinone.sh编译脚本打包所有静态库到一个动态so库文件：

#!/bin/bash
 
# NDK的路径，根据自己的安装位置进行设置
NDK=/home/pengtiegang/Android/android-ndk-r10e

# 编译针对的平台，可以根据自己的需求进行设置
# 这里选择最低支持android-14, arm架构，生成的so库是放在
# libs/armeabi文件夹下的，若针对x86架构，要选择arch-x86
PLATFORM=$NDK/platforms/android-9/arch-arm

# 工具链的路径，根据编译的平台不同而不同
# arm-linux-androideabi-4.8与上面设置的PLATFORM对应，4.8为工具的版本号，
# 根据自己安装的NDK版本来确定，一般使用最新的版本
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64

function build_one
{
./configure \
    --prefix=$PREFIX \
    --target-os=linux \
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    --arch=arm \
    --sysroot=$PLATFORM \
    --extra-cflags="-I$PLATFORM/usr/include" \
    --cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc \
    --nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm \
    --disable-shared \
    --enable-runtime-cpudetect \
    --enable-gpl \
    --enable-small \
    --enable-cross-compile \
    --disable-debug \
    --enable-static \
    --disable-doc \
    --disable-asm \
    --disable-yasm \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-ffprobe \
    --disable-ffserver \
    --disable-indevs \
    --disable-devices \
    --disable-bsfs \
    --disable-outdevs \
    --enable-filter=aresample \
    --enable-bsf=aac_adtstoasc \
    --enable-bsf=h264_mp4toannexb \
    --enable-dct \
    --enable-dwt \
    --enable-lsp \
    --enable-mdct \
    --enable-rdft \
    --enable-fft \
    --enable-version3 \
    --enable-nonfree \
    --disable-encoders \
    --enable-encoder=pcm_s16le \
    --enable-encoder=aac \
    --enable-encoder=libmp3lame \
    --enable-encoder=libfdk_aac \
    --enable-encoder=libx264 \
    --enable-encoder=mp2 \
    --disable-decoders \
    --enable-decoder=aac \
    --enable-decoder=mjpeg \
    --enable-decoder=png \
    --enable-decoder=gif \
    --enable-decoder=mp3 \
    --enable-decoder=h264 \
    --enable-decoder=pcm_s16le \
    --disable-parsers \
    --enable-parser=mjpeg  \
    --enable-parser=png  \
    --enable-parser=aac  \
    --enable-parser=h264  \
    --enable-parser=mpeg4video  \
    --enable-parser=mpegvideo  \
    --enable-parser=mpegaudio  \
    --disable-muxers \
    --enable-muxer=avi \
    --enable-muxer=flv \
    --enable-muxer=mp4 \
    --enable-muxer=m4v \
    --enable-muxer=mp3 \
    --enable-muxer=mov \
    --enable-muxer=h264 \
    --enable-muxer=wav \
    --enable-muxer=adts \
    --disable-demuxers \
    --enable-demuxer=mjpeg \
    --enable-demuxer=m4v \
    --enable-demuxer=gif \
    --enable-demuxer=mov \
    --enable-demuxer=avi \
    --enable-demuxer=flv \
    --enable-demuxer=h264 \
    --enable-demuxer=aac \
    --enable-demuxer=mp3 \
    --enable-demuxer=wav \
    --disable-protocols \
    --enable-protocol=rtmp \
    --enable-protocol=file \
    --enable-protocol=http \
    --disable-filters \
    --enable-filter=transpose \
    --enable-filter=crop \
    --enable-filter=vflip \
    --enable-filter=hflip \
    --disable-avdevice \
    --disable-stripping \
    --enable-libx264 \
    --enable-libfdk-aac \
    --enable-libmp3lame \
    --extra-cflags="-marm -march=armv7-a -I$PLATFORM/usr/include -Iexternal_libs/fdk-aac/build/armv7a/include -Iexternal_libs/libx264/build/armv7a/include -Iexternal_libs/lame/build/armv7a/include" \
    --extra-ldflags="-marm -march=armv7-a -Lexternal_libs/fdk-aac/build/armv7a/lib -Lexternal_libs/libx264/build/armv7a/lib -Lexternal_libs/lame/build/armv7a/lib" \

$ADDITIONAL_CONFIGURE_FLAG
sed -i '' 's/HAVE_LRINT 0/HAVE_LRINT 1/g' config.h
sed -i '' 's/HAVE_LRINTF 0/HAVE_LRINTF 1/g' config.h
sed -i '' 's/HAVE_ROUND 0/HAVE_ROUND 1/g' config.h
sed -i '' 's/HAVE_ROUNDF 0/HAVE_ROUNDF 1/g' config.h
sed -i '' 's/HAVE_TRUNC 0/HAVE_TRUNC 1/g' config.h
sed -i '' 's/HAVE_TRUNCF 0/HAVE_TRUNCF 1/g' config.h
sed -i '' 's/HAVE_CBRT 0/HAVE_CBRT 1/g' config.h
sed -i '' 's/HAVE_RINT 0/HAVE_RINT 1/g' config.h

make clean
make -j4
make install

$TOOLCHAIN/bin/arm-linux-androideabi-ld \
-rpath-link=$PLATFORM/usr/lib \
-L$PLATFORM/usr/lib \
-L$PREFIX/lib \
-soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o \
$PREFIX/libffmpeg.so \
    libavcodec/libavcodec.a \
    libavfilter/libavfilter.a \
    libswresample/libswresample.a \
    libavformat/libavformat.a \
    libavutil/libavutil.a \
    libswscale/libswscale.a \
    external_libs/libx264/libx264.a \
    external_libs/fdk-aac/build/armv7a/lib/libfdk-aac.a \
    external_libs/lame/build/armv7a/lib/libmp3lame.a \
    -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker \
    $TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.8/libgcc.a \

}

# arm v7vfp
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
PREFIX=./android/$CPU-vfp
ADDITIONAL_CONFIGURE_FLAG=
build_one

fdk-aac、lame、libx264、vo-aac为外部三方库，上面在build_android_allinone.sh脚本中已经添加了对这些库的支持，源码在external_libs目录下。
libfdk-aac的编译脚本如下所示。

#!/bin/bash
#Type Your NDK Root Path
NDK=/home/pengtiegang/Android/android-ndk-r10e
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64
PLATFORM=$NDK/platforms/android-9/arch-arm
export PATH=$PATH:$PREBUILT/bin:$PLATFORM/usr/include:

#export LDFLAGS="-nostdlib -Bdynamic -Wl,--whole-archive -Wl,--no-undefined -Wl,-z,noexecstack  -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$PLATFORM/usr/lib -L$PREBUILT/arm-linux-androideabi/lib -L$NDK/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi -lgnustl_static -L$NDK/sources/cxx-stl/stlport/libs/armeabi -lstlport_static -lc -lgcc -lm -ldl "
#export CFLAGS="-I$NDK/sources/cxx-stl/gnu-libstdc++/4.6/include -I$NDK/sources/cxx-stl/stlport/stlport -I$PLATFORM/usr/include -fpic -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP"
export LDFLAGS="-L$PLATFORM/usr/lib -L$PREBUILT/arm-linux-androideabi/lib"
export CFLAGS="-I$PLATFORM/usr/include  -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv7-a -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP"

export CPPFLAGS="$CFLAGS"
export CFLAGS="$CFLAGS"
export CXXFLAGS="$CFLAGS"
export LDFLAGS="$LDFLAGS"

export AS=$PREBUILT/bin/arm-linux-androideabi-as
export LD=$PREBUILT/bin/arm-linux-androideabi-ld
export CXX="$PREBUILT/bin/arm-linux-androideabi-g++ --sysroot=${PLATFORM}"
export CC="$PREBUILT/bin/arm-linux-androideabi-gcc --sysroot=${PLATFORM}"
export NM=$PREBUILT/bin/arm-linux-androideabi-nm
export STRIP=$PREBUILT/bin/arm-linux-androideabi-strip
export RANLIB=$PREBUILT/bin/arm-linux-androideabi-ranlib
export AR=$PREBUILT/bin/arm-linux-androideabi-ar

./configure --host=armv7a \
--enable-static \
--disable-shared \
--prefix=/home/pengtiegang/GitHubCode/ffmpeg-3.1.3/external_libs/fdk-aac/build/armv7a/

make clean
make -j8
make install

lame的编译脚本如下所示：

#!/bin/bash
NDK=/home/pengtiegang/Android/android-ndk-r10e
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64
PLATFORM=$NDK/platforms/android-9/arch-arm
export PATH=$PATH:$PREBUILT/bin:$PLATFORM/usr/include:

#export LDFLAGS="-nostdlib -Bdynamic -Wl,--whole-archive -Wl,--no-undefined -Wl,-z,noexecstack  -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$PLATFORM/usr/lib -L$PREBUILT/arm-linux-androideabi/lib -L$NDK/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi -lgnustl_static -L$NDK/sources/cxx-stl/stlport/libs/armeabi -lstlport_static -lc -lgcc -lm -ldl "
#export CFLAGS="-I$NDK/sources/cxx-stl/gnu-libstdc++/4.6/include -I$NDK/sources/cxx-stl/stlport/stlport -I$PLATFORM/usr/include -fpic -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP"
export LDFLAGS="-L$PLATFORM/usr/lib -L$PREBUILT/arm-linux-androideabi/lib -march=armv7-a -O3"
export CFLAGS="-I$PLATFORM/usr/include -march=armv7-a -O3"

export CPPFLAGS="$CFLAGS"
export CFLAGS="$CFLAGS"
export CXXFLAGS="$CFLAGS"
export LDFLAGS="$LDFLAGS"

export AS=$PREBUILT/bin/arm-linux-androideabi-as
export LD=$PREBUILT/bin/arm-linux-androideabi-ld
export CXX="$PREBUILT/bin/arm-linux-androideabi-g++ --sysroot=${PLATFORM}"
export CC="$PREBUILT/bin/arm-linux-androideabi-gcc --sysroot=${PLATFORM} -march=armv7-a "
export NM=$PREBUILT/bin/arm-linux-androideabi-nm
export STRIP=$PREBUILT/bin/arm-linux-androideabi-strip
export RANLIB=$PREBUILT/bin/arm-linux-androideabi-ranlib
export AR=$PREBUILT/bin/arm-linux-androideabi-ar

./configure --host=arm-linux \
--disable-shared \
--disable-frontend \
--enable-static \
--prefix=/home/pengtiegang/GitHubCode/ffmpeg-3.1.3/external_libs/lame/build/armv7a/ 

make clean
make -j8
make install 

libx264库的编译脚本：

#!/bin/bash
NDK=/home/pengtiegang/Android/android-ndk-r10e
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64
export CC="$PREBUILT/bin/arm-linux-androideabi-gcc --sysroot=${PLATFORM} -march=armv7-a"
export LD="$PREBUILT/bin/arm-linux-androideabi-ld"
export AS="$PREBUILT/bin/arm-linux-androideabi-gcc"
export AR="$PREBUILT/bin/arm-linux-androideabi-ar"
export RANLIB="$PREBUILT/bin/arm-linux-androideabi-ranlib"
export PLATFORM=$NDK/platforms/android-9/arch-arm 
export PREFIX=/home/pengtiegang/GitHubCode/ffmpeg-3.1.3/external_libs/libx264/build/armv7a/
export PATH=$PATH:$PREBUILT/bin:$PLATFORM/usr/include:

./configure --prefix=$PREFIX \
--enable-static \
--enable-pic \
--enable-strip \
--disable-cli \
--disable-asm \
--extra-cflags= "-march=armv7-a  -mfloat-abi=softfp -mfpu=neon" \
--host=arm-linux \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--sysroot=$PLATFORM

make clean
make 
make install

vo_aac的编译脚本：

#!/bin/bash
NDK=/home/pengtiegang/Android/android-ndk-r10e
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64
PLATFORM=$NDK/platforms/android-9/arch-arm
export PATH=$PATH:$PREBUILT/bin:$PLATFORM/usr/include:
echo $PATH
export LDFLAGS="-L$PLATFORM/usr/lib"
export CFLAGS="-L$PLATFORM/usr/lib -I$PLATFORM/usr/include"
echo $LDFLAGS
./configure --host=arm-linux-androideabi \
--with-sysroot=$PLATFORM/ \
--prefix=/home/pengtiegang/GitHubCode/ffmpeg-3.1.3/external_libs/vo_aac/build/armv5/ \
--enable-armv5e \
--includedir=$PLATFORM/usr/include \
--disable-shared

make clean
make
make install

至此FFmpeg库即可编译出来了，接下来我们可以创建AS工程来测试编译的FFmpeg库是否成功可用，
可以参考下一篇文章：Android FFmpegHellWorld（最简单的使用FFMpeg库的工程实例创建）