FFmpeg 2.8.4 移植到android平台(一)

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移植环境：

VirtualBox 下的Ubuntu 14.04 LTS （64位）adt-bundle-linux-x86_64-20140321android-ndk-r9d-linux-x86_64

所需资源：

FFmpeg 2.8.4

准备工作：

1.配置android sdk环境变量（注意：在linux环境下安装了android sdk，也已经配置好了环境变量，但是执行adb的时候出现如下错误：    mtl@xxx-Lenovo:/usr/xxx/android-sdk/platform-tools$ adb-bash: /usr/xxx/android-sdk/platform-tools/adb: 没有那个文件或目录 ；    出现这个问题的原因是机子是64位的，但是android sdk又是32位的，所以需要执行如下命令：    sudo apt-get install lib32bz2-1.0    sudo apt-get install lib32ncurses5 lib32stdc++62.配置ndk环境变量

移植步骤：

1.创建目录 ~/lplayer/jni （为了省事，这里我执行了chmod 777 jni）；2.解压FFmpeg 2.8.4源码，并重名为ffmepg，然后放入~/lplayer/jni3.创建相应NDK配置文件：    （1）~/lplayer/jni/Android.mk

        include $(all-subdir-makefiles)

    （2）~/lplayer/jni/ffmpeg/Android.mk

        LOCAL_PATH := $(call my-dir)        include $(CLEAR_VARS)        LOCAL_WHOLE_STATIC_LIBRARIES := libavformat libavcodec libavutil libpostproc libswscale        LOCAL_MODULE := ffmpeg        include $(BUILD_SHARED_LIBRARY)        include $(call all-makefiles-under,$(LOCAL_PATH))

    （3）~/lplayer/jni/ffmpeg/av.mk

        # 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))

    （4）~/lplayer/jni/ffmpeg/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)/..        LOCAL_CFLAGS += $(FFCFLAGS)        LOCAL_LDLIBS := -lz        LOCAL_STATIC_LIBRARIES := $(FFLIBS)        LOCAL_MODULE := $(FFNAME)        include $(BUILD_STATIC_LIBRARY)

    （5）~/lplayer/jni/ffmpeg/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)

    （6）~/lplayer/jni/ffmpeg/libavfilter/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_STATIC_LIBRARIES := $(FFLIBS)        LOCAL_MODULE := $(FFNAME)        include $(BUILD_STATIC_LIBRARY)

    （7）~/lplayer/jni/ffmpeg/libavutil/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_STATIC_LIBRARIES := $(FFLIBS)        LOCAL_MODULE := $(FFNAME)        include $(BUILD_STATIC_LIBRARY)

    （8）~/lplayer/jni/ffmpeg/libpostproc/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_STATIC_LIBRARIES := $(FFLIBS)        LOCAL_MODULE := $(FFNAME)        include $(BUILD_STATIC_LIBRARY)

    （9）~/lplayer/jni/ffmpeg/libswscale/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_STATIC_LIBRARIES := $(FFLIBS)        LOCAL_MODULE := $(FFNAME)        include $(BUILD_STATIC_LIBRARY)

4.编写ffmepg配置脚本：~/lpayer/jni/ffmpeg/config.sh 注意其中的NDK路径，请修改成你系统中对应的安装路径

    #!/bin/bash    PREBUILT=/home/lfn/software/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64    PLATFORM=/home/lfn/software/android/android-ndk-r9d/platforms/android-9/arch-arm./configure --target-os=linux \         --arch=arm \         --enable-version3 \         --enable-gpl \         --enable-nonfree \         --disable-stripping \         --disable-ffmpeg \         --disable-ffplay \         --disable-ffserver \         --disable-ffprobe \         --disable-encoders \         --disable-muxers \         --disable-devices \         --disable-protocols \         --enable-protocol=file \         --enable-avfilter \         --disable-network \         --disable-avdevice \         --disable-asm \         --enable-cross-compile \         --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \         --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \         --strip=$PREBUILT/bin/arm-linux-androideabi-strip \         --extra-cflags="-fPIC -DANDROID" \         --extra-ldflags="-Wl,-T,$PREBUILT/arm-linux-androideabi/lib/ldscripts/armelf_linux_eabi.x -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib $PREBUILT/lib/gcc/arm-linux-androideabi/4.6/crtbegin.o $PREBUILT/lib/gcc/arm-linux-androideabi/4.6/crtend.o -lc -lm -ldl"

5.运行配置文件

    chmod 755 config.sh    ./config.sh

这时会在~/lplayer/jni/ffmpeg目录下生成三个文件: config.h，config.mak，config.log。我们需要修改config.h文件，将其中的

    #define av_restrict restrict

修改成

    #define restrict

6.修改ffmpeg代码，以便在NDK中编译通过: 修改~/lplayer/jni/ffmpeg/libavutil/libm.h文件，  将其中的所有static方法都注释掉(为了省事我直接删掉的);   修改ffmpeg源码目录中的  libavcodev，libavfilter，libavformat，  libavutil，libpostproc，libswscale中的Makefile，  将Makefile中的开头：include $(SUBDIR)../config.mak都注释掉。7.开始编译（1）、进入目录：~/lplayer（2）、运行命令：ndk-build8.收工假如你没有错误，恭喜你，在目录~/lplayer/libs/armeabi下会有libffmpeg.so文件，这就是ffmpeg的库文件，可以直接拿来在通过JNI或者P/Invoke技术，使用了！

运行截图

1.运行配置文件（即上述步骤5）![这里写图片描述](http://img.blog.csdn.net/20160115164013654)虽然有警告，没有发现对结果有影响2.开始编译（即上述步骤7）![这里写图片描述](http://img.blog.csdn.net/20160115163824025)

后记

运气比较好，一次成功。没成功的童鞋，自行百度，谷歌出错原因^_^

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