Android-NDK-r9编译ffmpeg-0.11.3

1、准备Ubuntu12.04虚拟机，推荐使用VirtualBox2、 Ubuntu中安装相应的编译开发软件，如：build-essential之类的东西3、下载AndroidNDK r8b和Android SDK, all for linux，注意这个文档中使用的是Android NDK r8b和Android SDK 204、下载FFmpeg，这个文档

Markooa

2914人浏览 · 2013-08-13 17:39:53

Markooa · 2013-08-13 17:39:53 发布

1、操作系统Ubuntu 12.04

2、开发工具eclipse(Indigo)

3、下载/安装/配置Android-SDK_r21、Android-NDK-r9

4、下载FFmpeg，版本0.11.3

5、详细编译步骤：

（1）

mkdir lplayer

（2）

mkdir jni

5.2、进入目录jni，当前目录为：~/lplayer/jni

（1）解压ffmpeg源码包

tar -zxvf filename

（2）解压后，重命名ffmpeg源码文件为：

mv ffmpeg_original ffmpeg

5.3、创建相应NDK配置文件：

（1）~/lplayer/jni/Android.mk

include $(call 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)

5.4、配置ffmpeg

（1）编写配置脚本：~/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=/usr/local/app/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86
PLATFORM=/usr/local/app/android-ndk-r9/platforms/android-9/arch-arm

./configure --target-os=linux \
	--arch=arm \
	--enable-version3 \
	--enable-gpl \
	--enable-nonfree \
	--disable-doc \
	--disable-stripping \
	--disable-ffmpeg \
	--disable-ffplay \
	--disable-ffserver \
	--disable-ffprobe \
	--disable-encoders \
	--disable-muxers \
	--disable-devices \
	--enable-avfilter \
	--enable-network \
	--enable-protocol=tcp \
	--enable-avfilter \
	--enable-demuxer=flv \
	--enable-demuxer=h264 \
	--enable-parser=h264 \
	--enable-parser=aac \
	--enable-decoder=h264 \
	--enable-decoder=rawvideo \
	--enable-librtmp \
	--disable-avdevice \
	--disable-asm \
	--enable-neon \
	--enable-cross-compile \
	--cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
	--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
	--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
	--strip=$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"

（2）运行上配置文件：

chmod u+x config.sh
chmod u+x configure
./config.sh

（3）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 restrict restrict

修改成

#define restrict

5.5、修改ffmpeg代码，以便在NDK中编译通过
（1）、修改~/lplayer/jni/ffmpeg/libavutil/libm.h文件，将其中的所有static方法都注释掉
（2）、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。

5.6、现在可以开始编译了

方式一：进入目录：~/lplayer，运行命令：

ndk-build

找到该命令的前提是你已经把NDK目录加到了PATH系统环境变量中。
方式二：在eclipse中右击project->Debug As->Android Application
假如没有错误，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！

6、编译问题修复

6.1、error: libavcodec/codec_names.h: No such file or directory
解决办法：在ffmpeg目录下运行

cat libavcodec/avcodec.h | libavcodec/codec_names.sh config.h libavcodec/codec_names.h

源文档：http://bbs.rosoo.net/thread-13749-1-1.html

6.2、ERROR:
按照Scott所写的增加系列mk文件以及对libm.h进行修改，并生成及修改config.h后，开始尝试编译，一直到最后链接时出现以下的问题：
/home/chf0001/android-ndk/android-ndk-r5/samples/ffmpeg/obj/local/armeabi/libavutil.a(inverse.o):(.rodata+0x0): multiple definition of `ff_inverse'
/home/chf0001/android-ndk/android-ndk-r5/samples/ffmpeg/obj/local/armeabi/libavcodec.a(inverse.o):(.rodata+0x0): first defined here
查看后发现：
在目录libavcodec下有文件inverse.c，内容为：

#include "libavutil/inverse.c"

而libavutil下的inverse.c中定义了变量ff_inverse，所以在libavutil.a与libavcodec.a中都存在变量ff_inverse的定义，当这二个文件一起链接成libffmpeg.so时，就出现了上面的问题。
解决办法：直接修改libavcodec/Makefile，把下面一行删掉后，重新编译（先删除obj下生成的文件）。

OBJS-$(!CONFIG_SMALL)                  += inverse.o

那么这是不是ffmpeg的一个问题呢？应该不是，因为它的编译目标为libavutil.so, libavcodec.so，也就是说都是独立的小的so文件，而我们这边是最终产生一个统合的文件libffmpeg.so，其中包含了libavutil.a, libavcodec.a, 所以才产生了以上的问题。
源文档：http://blog.csdn.net/chf0001/article/details/6430667

参考：http://my.oschina.net/wangqin/blog/80345

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