ffmpeg在android平台上的移植

参考网址: https://vec.io/posts/how-to-build-ffmpeg-with-android-ndk

1:
git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg
git checkout 5e99df019a850e9ffa96d73e72b8a47a93a61de8

2:
export ANDROID_NDK=/home/shilingkai/android_app_dev/android-ndk-r9
export TOOLCHAIN=/tmp/ffmpeg
export SYSROOT=$TOOLCHAIN/sysroot/
$ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-14 --install-dir=$TOOLCHAIN

3:
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"

EXTRA_CFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad"
EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"

FFMPEG_FLAGS="--prefix=/tmp/ffmpeg/build \
--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 \
--disable-demuxer=sbg \
--enable-decoders \
--enable-bsfs \
--enable-network \
--enable-swscale \
--enable-asm \
--enable-version3"

./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS"

make clean
make -j4
make install

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 libffmpeg.so

arm-linux-androideabi-strip --strip-unneeded libffmpeg.so

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