Android 环境下编译FFmpeg
开发环境：Ubuntu 12.04.2 LTS , android-sdk-linux, android-ndk-r8e
一 、X264 编译
1、 X264源码下载
git clone git://git.videolan.org/x264.git
2、 环境配置
在X264根目录下创建文件config.sh 内容如下
#!/bin/sh
ANDROID_NDK_ROOT=$NDK_HOME
PREBUILT=$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
PLATFORM=$ANDROID_NDK_ROOT/platforms/android-9/arch-arm
ARM_INC=$PLATFORM/usr/include
ARM_LIB=$PLATFORM/usr/lib
ARM_LIBO=$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3
./configure --disable-gpac --enable-pic --enable-strip
--extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -march=armv7-a -mtune=cortex-a9 -mfloat-abi=softfp -mfpu=neon -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__ -Wno-psabi -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -MMD -MP "
--extra-ldflags="-nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc"
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi-
--host=arm-linux
--enable-static
--prefix='dist'
运行config.sh文件
配置关键点1：指定使用的交叉编译的编译器、链接的头文件及类库所在
配置关键点2：-march=armv7-a -mtune=cortex-a9 -mfloat-abi=softfp -mfpu=neon -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__ ，此处，针对armv7-a的CPU打开了NEON的优化运行指令。
配置关键点3：去掉--disable-asm选项。该选项的意思就是禁止neon的指令。
配置关键点4：添加--enable-static选项，生成静态链接的库供程序开发使用
3、 编译
直接：make
然后：make install
说明：ffmpeg不支持H264编码，这里要添加X264库，来支持H264编码
参考：http://www.2cto.com/kf/201303/194658.html
二 、fdk-aac 编译
1、 fdk-aac下载
a) http://sourceforge.net/projects/opencore-amr/files/fdk-aac/
b) fdk-aac-0.1.2.tar.gz
2、 fdk-aac 编译环境配置
a) 解压，在fdk-aac跟目录下创建config.sh文件内容如下
#!/bin/sh
ANDROID_API=android-9
SYSROOT=$NDK_HOME/platforms/$ANDROID_API/arch-arm
ANDROID_BIN=$NDK_HOME/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/
CROSS_COMPILE=${ANDROID_BIN}/arm-linux-androideabi-
#export PATH=$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools
ARM_INC=$SYSROOT/usr/include
ARM_LIB=$SYSROOT/usr/lib
LDFLAGS=" -nostdlib -Bdynamic -Wl,--whole-archive -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$NDK_HOME/sources/cxx-stl/gnu-libstdc++/libs/armeabi -L$NDK_HOME/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/arm-linux-androideabi/lib -L$ARM_LIB -lc -lgcc -lm -ldl "
FLAGS="--host=arm-androideabi-linux --enable-static --disable-shared"
export CXX="${CROSS_COMPILE}g++ --sysroot=${SYSROOT}"
export LDFLAGS="$LDFLAGS"
export CC="${CROSS_COMPILE}gcc --sysroot=${SYSROOT}"
./configure $FLAGS
--prefix='/home/zhangcb/works/mediaeffectplayer/android/fdk-aac-0.1.2/dist'
运行config.sh文件
3、 编译
直接：make
然后：make install
说明：
FFmpeg从2.0开始自带的AAC编码
需要的格式是sample_fmts = AV_SAMPLE_FMT_FLTP，不符合android音频的格式
(AV_SAMPLE_FMT_S8, AV_SAMPLE_FMT_S16),所有我们用ffmpeg录制的时候需要用
外部扩展的第三方库文件来编码，这里综合考虑用fdk-aac来编码
参考：https://trac.ffmpeg.org/wiki/AACEncodingGuide
三 、ffmpeg 编码
1. Ffmpeg 下载
a) http://www.ffmpeg.org/download.html 下载地址
b) 下载最新的ffmpeg-2.0.1.tar.gz
2. 在ffmpeg中添加Android编译文件
1) 在ffmpeg目录下添加文件av.mk 内容如下：
# LOCAL_PATH is one of libavutil, libavcodec, libavformat, or libswscale
#include $(LOCAL_PATH)/../config-$(TARGET_ARCH).mak
include $(LOCAL_PATH)/../config.mak
OBJS :=
OBJS-yes :=
MMX-OBJS-yes :=
include $(LOCAL_PATH)/Makefile
# collect objects
OBJS-$(HAVE_MMX) += $(MMX-OBJS-yes)
OBJS += $(OBJS-yes)
FFNAME := lib$(NAME)
FFLIBS := $(foreach,NAME,$(FFLIBS),lib$(NAME))
FFCFLAGS = -DHAVE_AV_CONFIG_H -Wno-sign-compare -Wno-switch -Wno-pointer-sign
FFCFLAGS += -DTARGET_CONFIG="config-$(TARGET_ARCH).h"
ALL_S_FILES := $(wildcard $(LOCAL_PATH)/$(TARGET_ARCH)/*.S)
ALL_S_FILES := $(addprefix $(TARGET_ARCH)/, $(notdir $(ALL_S_FILES)))
ifneq ($(ALL_S_FILES),)
ALL_S_OBJS := $(patsubst %.S,%.o,$(ALL_S_FILES))
C_OBJS := $(filter-out $(ALL_S_OBJS),$(OBJS))
S_OBJS := $(filter $(ALL_S_OBJS),$(OBJS))
else
C_OBJS := $(OBJS)
S_OBJS :=
endif
C_FILES := $(patsubst %.o,%.c,$(C_OBJS))
S_FILES := $(patsubst %.o,%.S,$(S_OBJS))
FFFILES := $(sort $(S_FILES)) $(sort $(C_FILES))
2) 分别修改
libavdevice libpostproc libavfilter libavformat libswresample libavresample libswscale libavcodec libavutil 下的Makefile 文件
把下面一句删除
include $(SUBDIR)../config.mak
3) 在ffmpeg目录下，创建Android.mk文件
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
#begin package so file
LOCAL_WHOLE_STATIC_LIBRARIES := libavformat libavcodec libavutil libswscale libavfilter libpostproc libswresample libavdevice
LOCAL_MODULE := ffmpeg
LOCAL_LDLIBS := -lz
LOCAL_LDFLAGS += $(X264_HOME)/dist/lib/libx264.a -O2 #引用外部静态库
LOCAL_LDFLAGS += $(AAC_HOME)/dist/lib/libfdk-aac.a -O2
include $(BUILD_SHARED_LIBRARY)
#end package
include $(call all-makefiles-under,$(LOCAL_PATH))
创建libavformat/Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_SRC_FILES := $(FFFILES)
LOCAL_C_INCLUDES :=
$(LOCAL_PATH)
$(LOCAL_PATH)/..
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_CFLAGS += -include "string.h" -Dipv6mr_interface=ipv6mr_ifindex
LOCAL_LDLIBS := -lz
LOCAL_STATIC_LIBRARIES := $(FFLIBS)
LOCAL_MODULE := $(FFNAME)
include $(BUILD_STATIC_LIBRARY)
创建libavcodec/Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_SRC_FILES := $(FFFILES)
LOCAL_C_INCLUDES :=
$(LOCAL_PATH)
$(LOCAL_PATH)/arm
$(LOCAL_PATH)/..
$(X264_HOME)/dist/include
$(AAC_HOME)/dist/include
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_LDFLAGS += $(X264_HOME)/dist/lib/libx264.a -O2
LOCAL_LDFLAGS += $(AAC_HOME)/dist/lib/libfdk-aac.a -O2
LOCAL_LDLIBS := -lz
LOCAL_STATIC_LIBRARIES := $(FFLIBS)
LOCAL_MODULE := $(FFNAME)
include $(BUILD_STATIC_LIBRARY)
分别创建libpostproc libavfilter libswresample libavresample libswscale libavutil
下的Android.mk内容如下
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_SRC_FILES := $(FFFILES)
LOCAL_C_INCLUDES :=
$(LOCAL_PATH)
$(LOCAL_PATH)/..
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_STATIC_LIBRARIES := $(FFLIBS)
LOCAL_MODULE := $(FFNAME)
include $(BUILD_STATIC_LIBRARY)
回到 jni 目录 添加文件Android.mk
PROJECT_PATH = $(shell pwd)
X264_HOME = $(PROJECT_PATH)/../x264
AAC_HOME = $(PROJECT_PATH)/../fdk-aac-0.1.2
include $(all-subdir-makefiles)
4)
3. 编码环境配置
在ffmpeg目录下创建config.sh文件内容如下
#!/bin/bash
PROJECT_PATH=/home/zhangcb/works/mediaeffectplayer/android/CmmobiVideo
ANDROID_NDK_ROOT=$NDK_HOME
PREBUILT=$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
PLATFORM=$ANDROID_NDK_ROOT/platforms/android-9/arch-arm
ARM_LIBO=$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3
X264_HOME=$PROJECT_PATH/../x264
AAC_HOME=$PROJECT_PATH/../fdk-aac-0.1.2
./configure --target-os=linux
--arch=arm
--enable-version3
--enable-gpl
--enable-nonfree
--disable-shared
--disable-stripping
--disable-ffmpeg
--disable-ffplay
--disable-ffserver
--disable-ffprobe
--disable-protocols
--enable-protocol=file
--enable-protocol=udp
--enable-protocol=tcp
--enable-protocol=http
--enable-network
--enable-encoders
--enable-decoders
--enable-muxers
--disable-avdevice
--disable-indevs
--disable-filters
--disable-devices
--disable-parsers
--disable-postproc
--disable-debug
--enable-cross-compile
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi-
--extra-cflags=" -fPIC -DANDROID -I$PLATFORM/usr/include -I$X264_HOME/dist/include -I$AAC_HOME/dist/include"
--disable-asm
--disable-yasm
--enable-libx264
--enable-libfdk-aac
--enable-neon
--enable-armv5te
--sysinclude=$PLATFORM/usr/include
--extra-ldflags="-Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -L$ARM_LIBO -lc -lm -ldl -lgcc -L$X264_HOME/dist/lib -L$AAC_HOME/dist/lib"
--extra-libs="-lgcc"
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/restrict restrict/restrict/g' config.h
sed -i 's/HAVE_CBRT 0/HAVE_CBRT 1/g' config.h
sed -i 's/HAVE_CBRTF 0/HAVE_CBRTF 1/g' config.h
sed -i 's/HAVE_ISINF 0/HAVE_ISINF 1/g' config.h
sed -i 's/HAVE_ISNAN 0/HAVE_ISNAN 1/g' config.h
sed -i 's/HAVE_SINF 0/HAVE_SINF 1/g' config.h
sed -i 's/HAVE_RINT 0/HAVE_RINT 1/g' config.h
运行config.sh生产文件
打开 libavutil/parseutils.h，把 #include <time.h> 替换为 #include <sys/../time.h> 不然会报错
4. Ffmpeg编码
运行：ndk-build 生成文件
libavcodec.a libavfilter.a libavutil.a libpostproc.a libswresample.a
libavdevice.a libavformat.a libswscale.a
参考：http://blog.csdn.net/dyllove98/article/details/9043493
http://www.360doc.com/content/10/1213/15/4914074_77710982.shtml#