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。