ffmpeg 移植到 android 转

http://blog.csdn.net/perfectpdl/article/details/6932696

一:生成动态库(.so文件)

-->环境:

操作系统:Ubuntu9.10

ffmpeg源码版本:ffmpeg-0.6.1(可以在http://ffmpeg.org/download.html下载源码)

androidndk版本:android-ndk-r4b-linux-x86(可以在http://androidappdocs.appspot.com/sdk/ndk/index.html下载)

-->设置NDK环境变量:

1、用root用户登陆,打开命令窗口,输入cd/root

2、输入ls-a,会显示一个隐藏文件.bashrc

3、输入vi.bashrc,按i进入编辑模式

4、文件底部添加以下两行:

NDK_ROOT=/home/ndk。这里指你ndk的目录路径

exportNDK_ROOT

5、按esc退出,再按:wq保存

-->你可以测试一下有没有安装成功:

$cd$NDK_ROOT

$./ndk-buildNDK_PROJECT_PATH=$NDK_ROOT/samples/two-libs

-->找到生成的文件就代表安装正常了:

1、如果提示某个文件"Permissiondenied"之类的信息时,执行chmod777your_filename就行了

2、如果提示找不到'cc1'等信息,执行chmod-R777*,就能解决了

-->配置源代码:

在/home/ndk/samples/创建一个FFMPEG文件夹,在里面再新建一个jni文件夹,然后把ffmpeg源码放在jni里面,所以最后ffmpeg源码的路径是:

/home/ndk/samples/FFMPEG/jni/ffmpeg

1.在ffmpeg源文件夹下创建一个config.sh,内容如下:

#!/bin/bash

PREBUILT=/home/xxx/android_NDK/android-ndk-r4b/build/prebuilt/linux-x86/arm-eabi-4.4.0

PLATFORM=/home/xxx/android_NDK/android-ndk-r4b/build/platforms/android-8/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-mpegaudio-hp\

--disable-avdevice\

--enable-cross-compile\

--cc=$PREBUILT/bin/arm-eabi-gcc\

--cross-prefix=$PREBUILT/bin/arm-eabi-\

--nm=$PREBUILT/bin/arm-eabi-nm\

--extra-cflags="-fPIC-DANDROID"\

--disable-asm\

--enable-neon\

--enable-armv5te\

--extra-ldflags="-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x-Wl,-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-nostdlib$PREBUILT/lib/gcc/arm-eabi/4.4.0/crtbegin.o$PREBUILT/lib/gcc/arm-eabi/4.4.0/crtend.o-lc-lm-ldl"

记得PREBUILT和PLATFORM要设置正确,它在你的NDK里面,你可以按自己的填写

2.然后打开命令窗口,cdffmpeg源文件夹下。

$chmod+xconfig.sh/*这个命令是改变config.sh执行权限而已*/

$./config.sh

如果配置正确的话显示出来的最后两行是这样的:

License:nonfreeandunredistributable

Creatingconfig.makandconfig.h...

3、Configure完成后接下做NDK编译的条件了。

Android的GCC是不支持restrict关键字的,所以把ffmpeg源码下configure生成的config.h文件中的这一行:

#definerestrictrestrict改成#definerestrict/*意思就是把后面的restrict去掉*/

如果重新Configure的话记得要把这个关键字去掉。

编辑libavutil/libm.h把其中的static的方法都删除(如果找不到libavutil/libm.h,就表明你的ffmpeg版本不是0.6而是0.5的。)

分别把libavutil、libavcodec、libavformat、libavfilter、libpostproct和libswscale下的Makefile文件中下面两行删除掉:

include$(SUBDIR)../subdir.mak

include$(SUBDIR)../config.mak

然后在ffmpeg源文件夹下新建一个av.mk文件,内容如下:(这些不用替换回车)

#LOCAL_PATHisoneoflibavutil,libavcodec,libavformat,orlibswscale

#include$(LOCAL_PATH)/../config-$(TARGET_ARCH).mak

include$(LOCAL_PATH)/../config.mak

OBJS:=

OBJS-yes:=

MMX-OBJS-yes:=

include$(LOCAL_PATH)/Makefile

#collectobjects

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))

接下来就是从jni文件夹开始写Android.mk文件,如jni文件下新建一个Android.mk,内容如下:

include$(all-subdir-makefiles)

在ffmpeg下,Android.mk内容如下:

LOCAL_PATH:=$(callmy-dir)

include$(CLEAR_VARS)

LOCAL_SHARED_LIBRARIES:=libavformatlibavcodeclibavutillibpostproclibswscalelibavfilter

LOCAL_MODULE:=ffmpeg

include$(BUILD_SHARED_LIBRARY)

include$(callall-makefiles-under,$(LOCAL_PATH))

在ffmpeg\libavformat下,Android.mk内容如下:

LOCAL_PATH:=$(callmy-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_SHARED_LIBRARIES:=libavutillibavcodec

LOCAL_MODULE:=$(FFNAME)

include$(BUILD_SHARED_LIBRARY)

在ffmpeg\libavcodec下,Android.mk内容如下:

LOCAL_PATH:=$(callmy-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_SHARED_LIBRARIES:=libavutil

LOCAL_MODULE:=$(FFNAME)

include$(BUILD_SHARED_LIBRARY)

在ffmpeg\libavfilter、ffmpeg\libavutil、ffmpeg\libpostproc、ffmpeg\libswscale下的Android,mk文件内容如下:

/*最主要是下面加红那行不一样*/

LOCAL_PATH:=$(callmy-dir)

include$(CLEAR_VARS)

include$(LOCAL_PATH)/../av.mk

LOCAL_SRC_FILES:=$(FFFILES)

LOCAL_C_INCLUDES:=\

$(LOCAL_PATH)\

$(LOCAL_PATH)/..

LOCAL_CFLAGS+=$(FFCFLAGS)

#LOCAL_SHARED_LIBRARIES:=(这行根据下面蓝色的来填写相应的lib)

LOCAL_MODULE:=$(FFNAME)

include$(BUILD_SHARED_LIBRARY)

----------------------------------------

ffmpeg\libavutil:不需要这一行,直接加#屏蔽掉。

ffmpeg\libswscale:LOCAL_SHARED_LIBRARIES:=libavutil

ffmpeg\libavfilter:LOCAL_SHARED_LIBRARIES:=libavutillibswscalelibavcodec

ffmpeg\libpostproc:LOCAL_SHARED_LIBRARIES:=libavutil

可能编译libavdevice也是用上面这个Android.mk,然后根据提示的错误没改变红色这行就OK了。

最后就是运行ndk-build了:

$cd$NDK_ROOT

$./ndk-buildNDK_PROJECT_PATH=$NDK_ROOT/samples/FFMPEG

最后生成libavcodec.so、libavutil.so、libavformat.so、libavfilter.so、libswscale.so和libpostproc.so以及libffmpeg.so,你会发现libffmpeg.so只有2K(1599个字节),其实这个文件是没有加载任何东西而编译成的空SO文件,没有任何函数的SO文件。所以不能用,但其它的都可以。估计是没有LOCAL_SRC_FILES的原因。

另外一篇不错的参考文章:http://www.eoeandroid.com/thread-42184-1-1.html,它生成的是静态库

二:生成静态库(.a文件)

-->环境配置

同上

-->源代码配置

1.

在AndroidNDK上建立一個project。

2.

將FFmpeg的sourcecode整包copy到$(PROJECT)/jni底下。

3.

在$(PROJECT)/jni/ffmpeg底下建立一個config.sh:

#!/bin/bash

PREBUILT=/android-ndk-r4b/build/prebuilt/windows/arm-eabi-4.4.0

PLATFORM=/android-ndk-r4b/build/platforms/android-8/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-mpegaudio-hp\

--disable-avdevice\

--enable-cross-compile\

--cc=$PREBUILT/bin/arm-eabi-gcc\

--cross-prefix=$PREBUILT/bin/arm-eabi-\

--nm=$PREBUILT/bin/arm-eabi-nm\

--extra-cflags="-fPIC-DANDROID"\

--disable-asm\

--enable-neon\

--enable-armv5te\

--extra-ldflags="-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x-Wl,-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-nostdlib$PREBUILT/lib/gcc/arm-eabi/4.4.0/crtbegin.o$PREBUILT/lib/gcc/arm-eabi/4.4.0/crtend.o-lc-lm-ldl"

PREBUILT和PLATFORM應該要符合你自己的配置。

4.

在Cygwin中,$(PROJECT)/jni/ffmpeg底下執行config.sh:

$./config.sh

configure會依據config.sh內的設定將config.mak及config.h建立出來。

5.

在剛剛生成的config.h中找到這句:

#definerestrictrestrict

因為Android的gcc並不認得restrict這個keyword,所以把它改寫成:

#definerestrict

6.

將/libavutil/libm.h中所有的static函式,全都mark起來。

7.

分別修改libavcodec、libavfilter、libavformat、libavutil、libpostproc和libswscale下的Makefile,將下面兩句mark起來:

include$(SUBDIR)../config.mak

include$(SUBDIR)../subdir.mak

8.

在$(PROJECT)/jni/ffmpeg下建立一個檔案av.mk,內容如下:

#LOCAL_PATHisoneoflibavutil,libavcodec,libavformat,orlibswscale

include$(LOCAL_PATH)/../config.mak

OBJS:=

OBJS-yes:=

MMX-OBJS-yes:=

include$(LOCAL_PATH)/Makefile

#collectobjects

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))

9.

在$(PROJECT)/jni底下修改Android.mk,內容如下:

include$(all-subdir-makefiles)

10.

在/ffmpeg底下新增一個Android.mk:

LOCAL_PATH:=$(callmy-dir)

include$(CLEAR_VARS)

LOCAL_STATIC_LIBRARIES:=libavformatlibavcodeclibavutillibpostproclibswscale

LOCAL_MODULE:=ffmpeg

include$(BUILD_SHARED_LIBRARY)

include$(callall-makefiles-under,$(LOCAL_PATH))

11.

在/ffmpeg/libavformat底下新增一個Android.mk:

LOCAL_PATH:=$(callmy-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)

12.

在/ffmpeg/libavcodec底下新增一個Android.mk:

LOCAL_PATH:=$(callmy-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)

13.

在libavfilter、libavutil、libpostproc和libswscale底下都分別新增一個Android.mk:

LOCAL_PATH:=$(callmy-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)

14.

在$(PROJECT)底下執行ndk-build:

$/android-ndk-r4b/ndk-build

15.

完成,產生出libavcodec.a、libavformat.a、libavutil.a、libpostproc.a、libswscale.a和libffmpeg.so。

相关推荐