从事多媒体软件开发的人几乎没有不知道FFmpeg的，很多视频播放器都是基于FFmpeg开发的。如今最火的智能手机操作系统Android上的很多第三方视频播放器也是基于FFmpeg实现全格式支持。由于Android通常跑在ARM处理器上，而且Android使用了自己的libc库（即bionic），因此要在Android上编译和使用FFmpeg需要做一些移植工作，好在FFmpeg本身用C写成，很好地支持跨平台移植，实现这个目的并不难，事实上已经有很多前辈做过这方面的工作并公开了他们的成果。

1. Rockplayer:

http://rockplayer.freecoder.org/index_cn.html

http://blog.csdn.net/harry_helei/article/details/6322767

2. havlenapetr:

http://github.com/havlenapetr/FFMpeg

http://blog.csdn.net/scut1135/article/details/6536157

http://hi.baidu.com/eefolks/blog/item/e0329e4682859129cefca351.html

http://ajavn.com/anzhuotuandui/4351.html

3. halfninja:

https://github.com/halfninja/android-ffmpeg-x264

4. olvaffe's:

http://gitorious.org/~olvaffe/ffmpeg/ffmpeg-android

http://www.nujk.com/ffmpeg-on-android

5. 流媒体开发论坛 - 罗索工作室:

http://www.rosoo.net/a/201108/14834.html

http://bbs.rosoo.net/thread-6252-1-1.html

当下本人也做这方面的事情，主要是优化ffmpeg编解码的性能，当然首先就是要搭建环境，编译代码，测试代码性能，然后优化模块，编译测试和调试，最终再测试性能：看了很多文章，对于一些新手是有点帮助，但是都不是很全面，下面简单记录下我如何搭建环境，如何编译，测试：

可以使用Rockplayer的方案进行实践。Rockplayer是Android上最有名的第三方视频播放器之一，其开发者根据LGPL协议公开了所使用的FFmpeg源码，该方案用Android NDK将FFmpeg源码编译生成一个单独的共享库libffmpeg.so，其中静态链接了libavformat、libavcodec、libavutil等模块，要使用FFmpeg只需要调用这一个.so即可。当然有了这个库还只是第一步，要利用FFmpeg开发一个自己的播放器或者把FFmpeg集成到Android本身的播放引擎stagefright中还需要很多其他工作，包括针对硬件平台进行优化。目前我做的只是编译出libffmpeg.so以及将FFmpeg自带的工具ffmpeg在adb shell中跑起来。我是在Android 3.2（Honeycomb）上编译FFmpeg，所用NDK版本为r7，在Android的其他版本上编译也大同小异。

题外话：Rockplayer之前也和他们谈过合作的事情，一家几个人搞得小型公司（其实也谈不上公司了），office在上海张江一个不起眼的小区里，也不能说他们没有技术含量，只能说他们找到一个突破口，能挣点小钱，他们的android手机播放器设计原则是支持要全，画质要清晰，性能不是主要，面向中高档手机，配置相对来说就高些。

下面把具体编译步骤描述如下，假定NDK安装在~/android-ndk-r7：

1. 首先从FFmpeg官网下载最新的release版本源码ffmpeg-0.11.tar.gz解压缩到Android源码树的ffmpeg/下。

2 准备一个编译脚本build_android.sh并放在ffmpeg/下面，这个脚本也是Rockplayer提供的，需做一些修改，其内容附在后面。我目前用的也会附在后面。

3 在ffmpeg目录下运行./build_android.sh开始编译FFmpeg，编译好的libffmpeg.so会放在文件夹android里面，一共有3个版本分别对应3种ARM体系结构，包括armv7-a、armv7-a-vfp、armv6_vfp，根据所运行的硬件平台选取其中一个版本。为了编译使用FFmpeg的程序时可以方便地找到libffmpeg.so，可将它复制到$OUT/system/lib/和$OUT/obj/lib/，当然这一步也可以加在build_android.sh中做。

4. 接下来就是编译可执行文件ffmpeg了，这个工具可以在命令行下完成FFmpeg提供的几乎所有功能包括编码、解码、转码等，也是用来调试和验证很有用的工具。其实上述编译完后在$ANDROID_BUILD_TOP/external/ffmpeg/下也会生成ffmpeg，但是在设备上无法运行。为了编出能在设备上运行的ffmpeg，可以写一个简单的Android.mk，其内容如下：

[cpp] view plain copy print ?
  1. LOCAL_PATH:=$(callmy-dir)
  3. include$(CLEAR_VARS)
  7. LOCAL_SRC_FILES:=\
  9. cmdutils.c\
  11. ffmpeg.c
  15. LOCAL_C_INCLUDES:=
  19. LOCAL_SHARED_LIBRARIES:=\
  21. libffmpeg
  25. LOCAL_PRELINK_MODULE:=false
  29. LOCAL_MODULE:=ffmpeg
  33. include$(BUILD_EXECUTABLE)

也可以在E:\android-ndk-r7-windows\android-ndk-r7\samples\test-libstdc++\jni这个目录修改下Android.mk， 修改为：

[cpp] view plain copy print ?
  1. LOCAL_PATH:=$(callmy-dir)
  2. include$(CLEAR_VARS)
  4. LOCAL_SRC_FILES:=ffmpeg.ccmdutils.c
  6. #LOCAL_PREBUILT_LIBS:=libffmpeg
  7. LOCAL_ARM_MODE:=arm
  8. LOCAL_C_INCLUDES+=\
  9. $(LOCAL_PATH)/include\
  10. $(LOCAL_PATH)/include/libavcodec\
  11. $(LOCAL_PATH)/\
  12. $(LOCAL_PATH)/include/libavfilter\
  13. $(LOCAL_PATH)/include/libavdevice\
  14. $(LOCAL_PATH)/include/libavutil
  15. #LOCAL_LDLIBS:=-L$(LOCAL_PATH)-lffmpeg
  16. LOCAL_LDLIBS:=libffmpeg.so
  17. LOCAL_MODULE:=ffmpeg
  19. include$(BUILD_EXECUTABLE)


当然要把ffmpeg.c cmdutils.c和libffmpeg.so拷贝到当前目录。

5. 将上面编好的libffmpeg.so和ffmpeg分别用adb push复制到设备的/system/lib/和/system/bin/，push之前可先对libffmpeg.so做一下strip否则太大。现在就可以在adb shell中运行ffmpeg了，使用方法与在PC上相同。当然如果要用到其他开源库例如x264那么还需要把它们也移植到Android。

以上是基本的步骤，仅供参考，可以根据具体情况修改build_android.sh里面的配置选项。如前所述，编译FFmpeg只是第一步，后续还有很多工作需要做，今后如果有进展再贴上来。

最后附上build_android.sh供参考，在此也感谢Rockplayer的开发者：

[cpp] view plain copy print ?
  1. #!/bin/bash
  5. ######################################################
  7. #FFmpegbuildsscriptforAndroid+ARMplatform
  9. #
  11. #Thisscriptisreleasedundertermof
  13. #CDDL(http://www.opensource.org/licenses/cddl1)
  15. #Wrotebypinxue(~@gmail.com)fromRockPlayer.com
  17. #2010-8~2011-4
  19. ######################################################
  23. ######################################################
  25. #Usage:
  27. #putthisscriptintopofFFmpegsourcetree
  29. #./build_android
  31. #
  33. #Itgeneratesbinaryforfollowingarchitectures:
  35. #ARMv6
  37. #ARMv6+VFP
  39. #ARMv7+VFPv3-d16(Tegra2)
  41. #ARMv7+Neon(Cortex-A8)
  43. #
  45. #Customizing:
  47. #1.Feelfreetochange./configureparametersformorefeatures
  49. #2.ToadaptotherARMvariants
  51. #set$CPUand$OPTIMIZE_CFLAGS
  53. #callbuild_one
  55. ######################################################
  59. NDK=~/android-ndk-r7
  61. PLATFORM=$NDK/platforms/android-8/arch-arm/
  63. PREBUILT=../../prebuilt/linux-x86/toolchain/arm-eabi-4.4.3
  67. functionbuild_one
  69. {
  73. #-fasm:required.Androidheaderfileusesasmkeywordinsteadof__asm__,butmostofcdialect(likeansi,c99,gnu99)implies-fno-asm.
  75. #~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/asm/byteorder.h:Infunction'___arch__swab32':
  77. #~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/asm/byteorder.h:25:error:expected')'before':'token
  81. #-fno-short-enums:optimized.ElseFFmpegobjwillgenerateahugenumberofwarningforvariable-sizeenums,
  83. #thoughwemaysuppressthemby--no-enum-size-warning,itwouldbebettertoavoidit.
  85. #.../ld:warning:cmdutils.ousesvariable-sizeenumsyettheoutputistouse32-bitenums;useofenumvaluesacrossobjectsmayfail
  89. #--extra-libs="-lgcc":required.Elsecannotsolvesomeruntimefunctionsymbols
  91. #...undefinedreferenceto`__aeabi_f2uiz'
  95. #--enable-protocols:required.Withoutthisoption,thefileopenalwaysfailsmysteriously.
  97. #FFmpeg'sav_open_input_filewillinvokefileformatprobingfunctions,butbecausemostofusefuldemuxershasflagofzero
  99. #whichcausethemareignoredduringfileformatproblingandfalltourlstreamparsing,
  101. #ifprotocolsaredisabled,thefile://urlcannotbeopenedaswell.
  105. #$PREBUILT/bin/arm-eabi-ardlibavcodec/libavcodec.ainverse.o:required.
  107. #FFmpegincludestwocopiesofinverse.cbothinlibavutilandlibavcodecforperformanceconsideration(notsurethebenifityet)
  109. #Withoutthisstep,finalldofgeneratinglibffmpeg.sowillfailsilently,ifinvokeldthroughgcc,gccwillcollectmorereasonableerrormessage.
  113. #-llog:debugonly,FFmpegitselfdoesn'trequireitatall.
  115. #Withthisoption,wemaysimplyincludes"utils/Log.h"anduseLOGx()toobserveFFmpeg'sbehavior
  117. #PS,itseemsthetoolchainimplies-DNDEBUGsomewhere,itwouldbesafertousefollowingsyntax
  119. ##ifdefNDEBUG
  121. ##undefNDEBUG
  123. ##defineHAVE_NDEBUG
  125. ##endif
  127. ##include"utils/Log.h"
  129. ##ifdefHAVE_NDEBUG
  131. ##defineNDEBUG
  133. ##undefHAVE_NDEBUG
  135. ##endif
  139. #--whole-archive:required.Elseldgenerateasmall.sofile(about15k)
  143. #--no-stdlib:required.Androiddoesn'tusestandardcruntimebutinviteditsownwheal(bioniclibc)becauseoflicenseconsideration.
  147. #spacebefore\ofconfigurelines:requiredforsomeoptions.Elsenextlinewillbemergedintopreviouslines'scontentandcauseproblem.
  149. #Especiallythe--extra-cflags,thenextlinewillpasstogccinthiscaseandconfigurewillsaygcccannotcreateexecutable.
  153. #manyoptionsmentionedbyarticlesoverinternetareimpliedby-O2or-O3already,neednotrepeatatall.
  157. #twoorthreecommonoptimizationcflagsareomittedbecausenotsureaboutthetradeoffyet.invokeNDKbuildsystemwithV=1tofindthem.
  161. #-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.xmentionedbyalmosteveryarticlesoverinternet,butitisnotrequiredtospecifyatall.
  165. #-Dipv6mr_interface=ipv6mr_ifindex:required.Androidinetheaderdoesn'tuseipv6mr_interfacewhichisrequiredbyrfc,seemsitgeneratethisuserspaceheaderfiledirectlyfromkernelheaderfile,butLinuxkernelhasdecidedtokeepitsownnameforeverandaskuserspaceheadertouserfcname.
  169. #HAVE_SYS_UIO_H:required.Else:
  171. #Infileincludedfrom~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/linux/socket.h:29,
  173. #from~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/sys/socket.h:33,
  175. #fromlibavformat/network.h:35,
  177. #fromlibavformat/utils.c:46:
  179. #~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/linux/uio.h:19:error:redefinitionof'structiovec'
  181. #
  185. #--disable-doc:requiredbecauseofstrangebugoftoolchain.
  189. ./configure--target-os=linux\
  191. --prefix=$PREFIX\
  193. --enable-cross-compile\
  195. --extra-libs="-lgcc"\
  197. --arch=arm\
  199. --cc=$PREBUILT/bin/arm-eabi-gcc\
  201. --cross-prefix=$PREBUILT/bin/arm-eabi-\
  203. --nm=$PREBUILT/bin/arm-eabi-nm\
  205. --sysroot=$PLATFORM\
  207. --extra-cflags="-O3-fpic-DANDROID-DHAVE_SYS_UIO_H=1-Dipv6mr_interface=ipv6mr_ifindex-fasm-Wno-psabi-fno-short-enums-fno-strict-aliasing-finline-limit=300$OPTIMIZE_CFLAGS"\
  209. --disable-shared\
  211. --enable-static\
  213. --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-nostdlib-lc-lm-ldl-llog"\
  215. --enable-parsers\
  217. --enable-encoders\
  219. --enable-decoders\
  221. --enable-muxers\
  223. --enable-demuxers\
  225. --enable-swscale\
  227. --enable-swscale-alpha\
  229. --disable-ffplay\
  231. --disable-ffprobe\
  233. --disable-ffserver\
  235. --enable-network\
  237. --enable-indevs\
  239. --disable-bsfs\
  241. --enable-filters\
  243. --enable-avfilter\
  245. --enable-protocols\
  247. --enable-asm\
  249. $ADDITIONAL_CONFIGURE_FLAG
  255. #makeclean
  257. make-j4install
  261. $PREBUILT/bin/arm-eabi-ardlibavcodec/libavcodec.ainverse.o
  265. $PREBUILT/bin/arm-eabi-ld-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-sonamelibffmpeg.so-shared-nostdlib-z,noexecstack-Bsymbolic--whole-archive--no-undefined-o$PREFIX/libffmpeg.solibavcodec/libavcodec.alibavformat/libavformat.alibavutil/libavutil.alibavfilter/libavfilter.alibswscale/libswscale.alibavdevice/libavdevice.alibswresample/libswresample.a-lc-lm-lz-ldl-llog--warn-once--dynamic-linker=/system/bin/linker$PREBUILT/lib/gcc/arm-eabi/4.4.3/libgcc.a
  269. }
  273. #armv6
  275. CPU=armv6
  277. OPTIMIZE_CFLAGS="-marm-march=$CPU"
  279. PREFIX=./android/$CPU
  281. ADDITIONAL_CONFIGURE_FLAG=
  283. #build_one
  287. #armv7vfpv3
  289. CPU=armv7-a
  291. OPTIMIZE_CFLAGS="-mfloat-abi=softfp-mfpu=vfpv3-d16-marm-march=$CPU"
  293. PREFIX=./android/$CPU
  295. ADDITIONAL_CONFIGURE_FLAG=
  297. build_one
  301. #armv7vfp
  303. CPU=armv7-a
  305. OPTIMIZE_CFLAGS="-mfloat-abi=softfp-mfpu=vfp-marm-march=$CPU"
  307. PREFIX=./android/$CPU-vfp
  309. ADDITIONAL_CONFIGURE_FLAG=
  311. build_one
  315. #armv7n
  317. CPU=armv7-a
  319. OPTIMIZE_CFLAGS="-mfloat-abi=softfp-mfpu=neon-marm-march=$CPU-mtune=cortex-a8"
  321. PREFIX=./android/$CPU
  323. ADDITIONAL_CONFIGURE_FLAG=--enable-neon
  325. build_one
  329. #armv6+vfp
  331. CPU=armv6
  333. OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP-mfloat-abi=softfp-mfpu=vfp-marm-march=$CPU"
  335. PREFIX=./android/${CPU}_vfp
  337. ADDITIONAL_CONFIGURE_FLAG=
  339. build_one


下面是我使用的 build_android.sh文件：

[cpp] view plain copy print ?
  1. #!/bin/bash
  3. ######################################################
  4. #FFmpegbuildsscriptforAndroid+ARMplatform
  5. #
  6. #Thisscriptisreleasedundertermof
  7. #CDDL(http://www.opensource.org/licenses/cddl1)
  8. ######################################################
  9. #Usage:
  10. #putthisscriptintopofFFmpegsourcetree
  11. #./build_android
  12. #
  13. #Itgeneratesbinaryforfollowingarchitectures:
  14. #ARMv6
  15. #ARMv6+VFP
  16. #ARMv7+VFPv3-d16(Tegra2)
  17. #ARMv7+Neon(Cortex-A8)
  18. #
  19. #Customizing:
  20. #1.Feelfreetochange./configureparametersformorefeatures
  21. #2.ToadaptotherARMvariants
  22. #set$CPUand$OPTIMIZE_CFLAGS
  23. #callbuild_one
  24. ######################################################
  26. NDK=E:/android-ndk-r7-windows/android-ndk-r7
  27. PLATFORM=$NDK/platforms/android-8/arch-arm/
  28. PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows
  31. functionbuild_one
  32. {
  34. #-fasm:required.Androidheaderfileusesasmkeywordinsteadof__asm__,butmostofcdialect(likeansi,c99,gnu99)implies-fno-asm.
  35. #~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/asm/byteorder.h:Infunction'___arch__swab32':
  36. #~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/asm/byteorder.h:25:error:expected')'before':'token
  38. #-fno-short-enums:optimized.ElseFFmpegobjwillgenerateahugenumberofwarningforvariable-sizeenums,
  39. #thoughwemaysuppressthemby--no-enum-size-warning,itwouldbebettertoavoidit.
  40. #.../ld:warning:cmdutils.ousesvariable-sizeenumsyettheoutputistouse32-bitenums;useofenumvaluesacrossobjectsmayfail
  42. #--extra-libs="-lgcc":required.Elsecannotsolvesomeruntimefunctionsymbols
  43. #...undefinedreferenceto`__aeabi_f2uiz'
  45. #--enable-protocols:required.Withoutthisoption,thefileopenalwaysfailsmysteriously.
  46. #FFmpeg'sav_open_input_filewillinvokefileformatprobingfunctions,butbecausemostofusefuldemuxershasflagofzero
  47. #whichcausethemareignoredduringfileformatproblingandfalltourlstreamparsing,
  48. #ifprotocolsaredisabled,thefile://urlcannotbeopenedaswell.
  50. #$PREBUILT/bin/arm-linux-androideabi-ardlibavcodec/libavcodec.ainverse.o:required.
  51. #FFmpegincludestwocopiesofinverse.cbothinlibavutilandlibavcodecforperformanceconsideration(notsurethebenifityet)
  52. #Withoutthisstep,finalldofgeneratinglibffmpeg.sowillfailsilently,ifinvokeldthroughgcc,gccwillcollectmorereasonableerrormessage.
  54. #-llog:debugonly,FFmpegitselfdoesn'trequireitatall.
  55. #Withthisoption,wemaysimplyincludes"utils/Log.h"anduseLOGx()toobserveFFmpeg'sbehavior
  56. #PS,itseemsthetoolchainimplies-DNDEBUGsomewhere,itwouldbesafertousefollowingsyntax
  57. ##ifdefNDEBUG
  58. ##undefNDEBUG
  59. ##defineHAVE_NDEBUG
  60. ##endif
  61. ##include"utils/Log.h"
  62. ##ifdefHAVE_NDEBUG
  63. ##defineNDEBUG
  64. ##undefHAVE_NDEBUG
  65. ##endif
  67. #--whole-archive:required.Elseldgenerateasmall.sofile(about15k)
  69. #--no-stdlib:required.Androiddoesn'tusestandardcruntimebutinviteditsownwheal(bioniclibc)becauseoflicenseconsideration.
  71. #spacebefore\ofconfigurelines:requiredforsomeoptions.Elsenextlinewillbemergedintopreviouslines'scontentandcauseproblem.
  72. #Especiallythe--extra-cflags,thenextlinewillpasstogccinthiscaseandconfigurewillsaygcccannotcreateexecutable.
  74. #manyoptionsmentionedbyarticlesoverinternetareimpliedby-O2or-O3already,neednotrepeatatall.
  76. #twoorthreecommonoptimizationcflagsareomittedbecausenotsureaboutthetradeoffyet.invokeNDKbuildsystemwithV=1tofindthem.
  78. #-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.xmentionedbyalmosteveryarticlesoverinternet,butitisnotrequiredtospecifyatall.
  80. #-Dipv6mr_interface=ipv6mr_ifindex:required.Androidinetheaderdoesn'tuseipv6mr_interfacewhichisrequiredbyrfc,seemsitgeneratethisuserspaceheaderfiledirectlyfromkernelheaderfile,butLinuxkernelhasdecidedtokeepitsownnameforeverandaskuserspaceheadertouserfcname.
  82. #HAVE_SYS_UIO_H:required.Else:
  83. #Infileincludedfrom~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/linux/socket.h:29,
  84. #from~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/sys/socket.h:33,
  85. #fromlibavformat/network.h:35,
  86. #fromlibavformat/utils.c:46:
  87. #~/android/android-ndk-r4/build/platforms/android-5/arch-arm//usr/include/linux/uio.h:19:error:redefinitionof'structiovec'
  88. #
  90. #--disable-doc:requiredbecauseofstrangebugoftoolchain.
  92. ./configure--target-os=linux\
  93. --prefix=$PREFIX\
  94. --enable-cross-compile\
  95. --extra-libs="-lgcc"\
  96. --arch=arm\
  97. --enable-memalign-hack\
  98. --enable-gpl\
  99. --cc=$PREBUILT/bin/arm-linux-androideabi-gcc\
  100. --cross-prefix=$PREBUILT/bin/arm-linux-androideabi-\
  101. --nm=$PREBUILT/bin/arm-linux-androideabi-nm\
  102. --sysroot=$PLATFORM\
  103. --extra-cflags="-O3-fpic-DANDROID-DHAVE_SYS_UIO_H=1-Dipv6mr_interface=ipv6mr_ifindex-fasm-Wno-psabi-fno-short-enums-fno-strict-aliasing-finline-limit=300$OPTIMIZE_CFLAGS"\
  104. --disable-shared\
  105. --enable-static\
  106. --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/4.4.3/crtbegin.o$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtend.o-L$PLATFORM/usr/lib-lc-lm-ldl-llog"\
  107. --enable-parsers\
  108. --enable-decoders\
  109. --enable-swscale\
  110. --disable-ffplay\
  111. --disable-ffprobe\
  112. --disable-ffserver\
  113. --enable-network\
  114. --enable-indevs\
  115. --enable-optimizations\
  116. --enable-asm\
  117. --enable-swresample\
  118. --disable-debug
  119. $ADDITIONAL_CONFIGURE_FLAG
  121. #makeclean
  122. make-j4install
  124. $PREBUILT/bin/arm-linux-androideabi-ardlibavcodec/libavcodec.ainverse.o
  126. $PREBUILT/bin/arm-linux-androideabi-ld-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-sonamelibffmpeg.so-shared-nostdlib-z,noexecstack-Bsymbolic--whole-archive--no-undefined-o$PREFIX/libffmpeg.solibavcodec/libavcodec.alibavformat/libavformat.alibavutil/libavutil.alibavfilter/libavfilter.alibswscale/libswscale.alibswresample/libswresample.alibavresample/libavresample.alibpostproc/libpostproc.a-lc-lm-lz-ldl-llog--warn-once--dynamic-linker=/system/bin/linker$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
  128. }
  130. ##armv6
  131. #CPU=armv6
  132. #OPTIMIZE_CFLAGS="-marm-march=$CPU"
  133. #PREFIX=./android/$CPU
  134. #ADDITIONAL_CONFIGURE_FLAG=
  135. ##build_one
  136. #
  137. ##armv7vfpv3
  138. #CPU=armv7-a
  139. #OPTIMIZE_CFLAGS="-mfloat-abi=softfp-mfpu=vfpv3-d16-marm-march=$CPU"
  140. #PREFIX=./android/$CPU
  141. #ADDITIONAL_CONFIGURE_FLAG=
  142. #build_one
  143. #
  144. ##armv7vfp
  145. #CPU=armv7-a
  146. #OPTIMIZE_CFLAGS="-mfloat-abi=softfp-mfpu=vfp-marm-march=$CPU"
  147. #PREFIX=./android/$CPU-vfp
  148. #ADDITIONAL_CONFIGURE_FLAG=
  149. #build_one
  151. #armv7n
  152. CPU=armv7-a
  153. OPTIMIZE_CFLAGS="-mfloat-abi=softfp-mfpu=neon-marm-march=$CPU-mtune=cortex-a8"
  154. PREFIX=./android/$CPU
  155. ADDITIONAL_CONFIGURE_FLAG=--enable-neon
  156. build_one
  158. ##armv6+vfp
  159. #CPU=armv6
  160. #OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP-mfloat-abi=softfp-mfpu=vfp-marm-march=$CPU"
  161. #PREFIX=./android/${CPU}_vfp
  162. #ADDITIONAL_CONFIGURE_FLAG=
  163. #build_one


6. 把编译好的libffmpeg.so 和 可执行文件 ffmpeg 文件push到 手机里面运行测试！ 下面是操作步骤：

a: 拷贝文件到手机sdcard

E:\android-ndk-r7-windows\android-ndk-r7\samples\test-libstdc++\libs\armeabi>

拷贝可执行文件
adb push ffmpeg /sdcard/ttt
4507 KB/s (144248 bytes in 0.031s)

拷贝库

adb push liffmpeg.so /sdcard/ttt
3756 KB/s (8233079 bytes in 2.140s)

b: 从手机sdcard 拷贝到系统bin目录和系统lib目录

E:\android-ndk-r7-windows\android-ndk-r7\samples\test-libstdc++\libs\armeabi>adb
shell
$ su
su
# cd /system/bin
cd /system/bin

# rm ffmpeg
rm ffmpeg
# cat /sdcard/ttt/ffmpeg > ffmpeg
cat /sdcard/ttt/ffmpeg > ffmpeg

# chmod 777 ffmpeg
chmod 777 ffmpeg

# cd ../lib
cd /system/lib

# rm libffmpeg.so
rm libffmpeg.so
# cat /sdcard/ttt/libffmpeg.so >libffmpeg.so
cat /sdcard/ttt/libffmpeg.so >libffmpeg.so

# chmod 777 libffmpeg.so
chmod 777 libffmpeg.so

# cd ../bin
cd /system/bin


运行可执行文件：
./ffmpeg -i /sdcard/ttt/test.264 /sdcard/ttt/output.yuv

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