为android编译ffmpeg+x264+faac

1. 在x264的源码目录下创建b1.sh,内容如下：

export NDK=/opt/google/android/android-ndk-r8e
export VERSION=4.4.3
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-$VERSION/prebuilt
export PLATFORM=$NDK/platforms/android-8/arch-arm
./configure --enable-static \
--enable-shared \
--enable-pic \
--disable-asm \
--disable-cli \
--host=arm-linux \
--cross-prefix=$PREBUILT/linux-x86_64/bin/arm-linux-androideabi- \
--sysroot=$PLATFORM

2. 在ffmepg的父目录下创建b1.sh,内容如下：并创建目录elib，并把上面生成的lib264.a 拷贝到该目录下

#!/bin/bash
export VERSION=4.4.3
export NDK=/opt/google/android/android-ndk-r8e
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-$VERSION/prebuilt/linux-x86_64
export PLATFORM=$NDK/platforms/android-9/arch-arm
export FFMPEG_ROOT=/home/test/code/ffmpeg-1.1.5
export X264_ROOT=/home/test/code/x264_and #上面的x264的源码目录
export ELIB="$FFMPEG_ROOT/elib"
function build_one
{
$FFMPEG_ROOT/configure --target-os=linux \
--enable-cross-compile \
--enable-runtime-cpudetect \
--disable-asm \
--arch=arm \
--cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--disable-stripping \
--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
--sysroot=$PLATFORM \
--enable-nonfree \
--enable-version3 \
--disable-everything \
--enable-gpl \
--disable-doc \
--enable-avresample \
--enable-demuxer=rtsp \
--enable-muxer=rtsp \
--disable-ffplay \
--disable-ffserver \
--enable-ffmpeg \
--disable-ffprobe \
--enable-libx264 \
--enable-encoder=libx264 \
--enable-decoder=h264 \
--enable-protocol=rtp \
--enable-hwaccels \
--enable-zlib \
--disable-devices \
--disable-avdevice \
--extra-cflags="-I$X264_ROOT -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a" \
--extra-ldflags="-L$ELIB"
make -j4
}
build_one
$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$ELIB  -soname libffmpeg.so -shared -nostdlib  -z noexecstack -Bsymbolic --whole-archive --no-undefined -o libffmpeg.so libavcodec/libavcodec.a libavfilter/libavfilter.a libavresample/libavresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lx264 --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/$VERSION/libgcc.a

到此为止so文件已经编译完毕：
下面编译jni的so文件；

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
MY_PATH := /home/wanjm/code/binary #上面的so文件的目录
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES :=  $(MY_PATH)/libffmpeg.so #仅支持一个文件；
include $(PREBUILT_SHARED_LIBRARY)


include $(CLEAR_VARS)
LOCAL_MODULE    := myffmp
LOCAL_SRC_FILES := VideoEncoder.c #jni的c文件；
LOCAL_C_INCLUDES := /home/wanjm/code/ffmpeg-1.2.4
LOCAL_LDLIBS :=  -llog -lm -lc -ldl -lz -lstdc++
LOCAL_STATIC_LIBRARIES := libffmpeg #引用5处生成的so文件；
include $(BUILD_SHARED_LIBRARY)

上面so方式弄出来的，还是两个文件，在实际的java中，要限价在libffmpeg.so,然后在加载myffmp; 反序后会报告少依赖包, 但是按照该顺序还是加载失败;

然后按照下面的写法,可以生成单个so文件,且可以调试;

LOCAL_PATH := $(call my-dir)
MY_PATH :=/home/wanjm/code/binary/elib

include $(CLEAR_VARS)
#MY_PATH := /home/wanjm/code/binary
#LOCAL_MODULE := ffmpeg
#LOCAL_SRC_FILES :=  $(MY_PATH)/libffmpeg.so
#include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avcodec
LOCAL_SRC_FILES :=  $(MY_PATH)/libavcodec.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avformat
LOCAL_SRC_FILES :=  $(MY_PATH)/libavformat.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avutil
LOCAL_SRC_FILES :=  $(MY_PATH)/libavutil.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := x264
LOCAL_SRC_FILES :=  $(MY_PATH)/libx264.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := swscale
LOCAL_SRC_FILES :=  $(MY_PATH)/libswscale.a
include $(PREBUILT_STATIC_LIBRARY)


include $(CLEAR_VARS)
LOCAL_MODULE    := myffmp
LOCAL_SRC_FILES := VideoEncoder.c
LOCAL_C_INCLUDES := /home/wanjm/code/ffmpeg-1.2.4
LOCAL_LDLIBS :=  -llog -lm -lc -ldl -lz -lstdc++
LOCAL_STATIC_LIBRARIES := libavformat libavutil libavcodec libswscale  libavutil libx264
include $(BUILD_SHARED_LIBRARY)

makefile 脚本： 注意-lgcc 应该放在最后，否则找到__aeabi_idiv等方法；

VERSION=4.8
NDK_ROOT=/opt/google/android-ndk-r9b
TOOLCHAINS_ROOT=$(NDK_ROOT)/toolchains/arm-linux-androideabi-$(VERSION)/prebuilt/linux-x86_64
TOOLCHAINS_PREFIX=$(TOOLCHAINS_ROOT)/bin/arm-linux-androideabi
TOOLCHAINS_INCLUDE=$(TOOLCHAINS_ROOT)/lib/gcc/arm-linux-androideabi/$(VERSION)/include-fixed
SYSROOT=$(NDK_ROOT)/platforms/android-9/arch-arm
PLATFORM_INCLUDE=$(SYSROOT)/usr/include
PLATFORM_LIB=$(SYSROOT)/usr/lib
FLAGS= -fpic -DANDROID
#如果没有-lc，实际运行时会找不到gettimeofday；
LDFLAGS=-shared -L$(PLATFORM_LIB) --no-undefined  -lc -llog -lm -lc -ldl -lz  #-nostdlib -ldl -lm -Bdynamic -lc -lstdc++
#FLAGS="-I$(TOOLCHAINS_INCLUDE) -I$(PLATFORM_INCLUDE) " #-L$(PLATFORM_LIB) -nostdlib -lgcc -Bdynamic -lc"
CC=$(TOOLCHAINS_PREFIX)-gcc --sysroot=$(SYSROOT)
LD=$(TOOLCHAINS_PREFIX)-ld
libtime.so: main.o
$(LD) $(LDFLAGS) main.o -o libtime.so -L/home/wanjm/code/binary/elib  -lavformat -lavutil -lavcodec -lswscale -lavutil -lx264 -L$(TOOLCHAINS_ROOT)/lib/gcc/arm-linux-androideabi/$(VERSION) -lgcc
cp libtime.so ../libs/armeabi
main.o: VideoEncoder.c
$(CC) -c VideoEncoder.c -o main.o -I/home/wanjm/code/ffmpeg-1.2.4
clean:
rm -rf libtime.so
rm main.o

一步到位的ffmpeg+x264 for android 的编译；
1. 建立目录android，其下放置解压的ffmpeg和x264源码目录；建立install 目录，和make目录；
2. 在make中创建build.sh; 注意此处用的是相对目录，所以只能在make目录下运行；

#!/bin/bash
export VERSION=4.6
export NDK=/opt/google/android-ndk-r9b
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-$VERSION/prebuilt/linux-x86_64
export PLATFORM=$NDK/platforms/android-9/arch-arm
export FFMPEG_ROOT=../ffmpeg-1.2.4
export X264_ROOT=../x264 #上面的x264的源码目录
export PREFIX=../install
export ELIB="$PREFIX/lib"
export FAAC_ROOT=../faac-1.28
function build_x264
{
cd $X264_ROOT
pwd
./configure --enable-static \
--prefix=$PREFIX \
--enable-shared \
--enable-pic \
--disable-asm \
--disable-cli \
--host=arm-linux \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--sysroot=$PLATFORM
make
cp libx264.a  $ELIB
cd -
}
function build_faac
{
cd $FAAC_ROOT
pwd
CFLAGS="-fpic -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP "
#FLAGS="--host=arm-androideabi-linux --enable-static --disable-shared --prefix=$HOME --enable-armv5e  "
CROSS_COMPILE=$PREBUILT/bin/arm-linux-androideabi-
export CPPFLAGS="$CFLAGS"
export CFLAGS="$CFLAGS"
export CXXFLAGS="$CFLAGS"
export CXX="${CROSS_COMPILE}g++ --sysroot=${PLATFORM}"
export LDFLAGS="$LDFLAGS"
export CC="${CROSS_COMPILE}gcc --sysroot=${PLATFORM}"
export NM="${CROSS_COMPILE}nm"
export STRIP="${CROSS_COMPILE}strip"
export RANLIB="${CROSS_COMPILE}ranlib"
export AR="${CROSS_COMPILE}ar"
./configure --program-prefix=$PREFIX \
--host=arm-linux
make
cp ./libfaac/.libs/libfaac.a $ELIB
cd -
}
function build_one
{
$FFMPEG_ROOT/configure --target-os=linux \
--prefix=$PREFIX \
--enable-cross-compile \
--enable-runtime-cpudetect \
--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 \
--enable-nonfree \
--enable-version3 \
--enable-gpl \
--disable-doc \
--enable-avresample \
--enable-demuxer=rtsp \
--enable-muxer=rtsp \
--disable-ffplay \
--disable-ffserver \
--enable-ffmpeg \
--disable-ffprobe \
--enable-libx264 \
--enable-libfaac --enable-nonfree \
--enable-encoder=libx264 \
--enable-decoder=h264 \
--enable-protocol=rtp \
--enable-encoder=libfaac \
--enable-decoder=aac \
--enable-hwaccels \
--enable-zlib \
--disable-devices \
--disable-avdevice \
--extra-cflags="-I$X264_ROOT -I$FAAC_ROOT/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a" \
--extra-ldflags="-L$ELIB"
make -j4
make install
}
mkdir  -p $ELIB
build_faac
build_x264
build_one