最近想把VP9移植到Android手机上，折腾了很久，终于搞定，现在把方法和大家共享一下。
准备工作：
1、操作系统Ubuntu 12.04
2、下载 android-ndk32-r10d-linux-x86_64.tar.bz2
3、安装yasm，安装方法可以网上搜索
4、下载源代码，可采用以下3种途径
a 网站：http://www.webmproject.org/
b Linux平台
git clone https://github.com/webmproject/libvpx
c 或者直接网上下载libvpx-1.4.0。（当前编译采用这个版本）
配置NDK环境
采用的NDK的版本为android-ndk32-r10d-linux-x86_64
打开profile文件
sudo gedit /etc/profile
在profile文件末尾加上如下参数:
export ARM_ROOT=/home/willman/Projects/android_tools/ndk
export PATH=$ARM_ROOT:$PATH
export ARM_INC=$ARM_ROOT/platforms/android-21/arch-arm/usr/include/
export ARM_LIB=$ARM_ROOT/platforms/android-21/arch-arm/usr/lib/
export ARM_TOOL=$ARM_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
export ARM_LIBO=$ARM_TOOL/lib/gcc/arm-linux-androideabi/4.9
export PATH=$ARM_TOOL/bin:$PATH
export ARM_PRE=arm-linux-androideabi
装载环境变量
source /etc/profile
验证是否装载成功
ndk-build -v
编译脚本
进入libvpx-1.4.0文件夹后，cd build/ ：
编译为libvpx.a
../configure --target=armv7-android-gcc--sdk-path=$ARM_ROOT --prefix=/usr/local/android/--disable-examples--extra-cflags="-mfloat-abi=softfp -mfpu=neon"
编译为可执行文件
../configure --target=armv7-android-gcc--sdk-path=$ARM_ROOT --prefix=/usr/local/android/--disable-examples--extra-cflags="-mfloat-abi=softfp -mfpu=neon"–disable-runtime-cpu-detect
注：–disable-runtime-cpu-detect会报错，所以需要禁用，解决办法参考：http://blog.csdn.net/kl222/article/details/23101115
注：直接把--enable-examples会报错，所以不能直接用完整示例，所以采用simple_encoder这个示例。需要对examples.mk这个文件继续修改，修改如下：
# List ofexamples to build. UTILS are tools meant for distribution
# whileEXAMPLES demonstrate specific portions of the API.
UTILS-$(CONFIG_DECODERS) += vpxdec.c
vpxdec.SRCS+= md5_utils.c md5_utils.h
vpxdec.SRCS+= vpx_ports/mem_ops.h
vpxdec.SRCS+= vpx_ports/mem_ops_aligned.h
vpxdec.SRCS+= vpx_ports/vpx_timer.h
vpxdec.SRCS+= vpx/vpx_integer.h
vpxdec.SRCS+= args.c args.h
vpxdec.SRCS+= ivfdec.c ivfdec.h
vpxdec.SRCS+= tools_common.ctools_common.h
vpxdec.SRCS+= y4menc.c y4menc.h
ifeq($(CONFIG_LIBYUV),yes)
vpxdec.SRCS += $(LIBYUV_SRCS)
endif
ifeq($(CONFIG_WEBM_IO),yes)
vpxdec.SRCS += $(LIBWEBM_PARSER_SRCS)
vpxdec.SRCS += webmdec.cc webmdec.h
endif
vpxdec.GUID =BA5FE66F-38DD-E034-F542-B1578C5FB950
vpxdec.DESCRIPTION = Full featured decoder
UTILS-$(CONFIG_ENCODERS) += vpxenc.c
vpxenc.SRCS+= args.c args.h y4minput.cy4minput.h vpxenc.h
vpxenc.SRCS+= ivfdec.c ivfdec.h
vpxenc.SRCS+= ivfenc.c ivfenc.h
vpxenc.SRCS+= rate_hist.c rate_hist.h
vpxenc.SRCS+= tools_common.ctools_common.h
vpxenc.SRCS+= warnings.c warnings.h
vpxenc.SRCS += vpx_ports/mem_ops.h
vpxenc.SRCS+= vpx_ports/mem_ops_aligned.h
vpxenc.SRCS+= vpx_ports/vpx_timer.h
vpxenc.SRCS+= vpxstats.c vpxstats.h
ifeq($(CONFIG_LIBYUV),yes)
vpxenc.SRCS += $(LIBYUV_SRCS)
endif
ifeq($(CONFIG_WEBM_IO),yes)
vpxenc.SRCS += $(LIBWEBM_MUXER_SRCS)
vpxenc.SRCS += webmenc.cc webmenc.h
endif
vpxenc.GUID =548DEC74-7A15-4B2B-AFC3-AA102E7C25C1
vpxenc.DESCRIPTION = Full featured encoder
ifeq($(CONFIG_SPATIAL_SVC),yes)
EXAMPLES-$(CONFIG_VP9_ENCODER) += vp9_spatial_svc_encoder.c
vp9_spatial_svc_encoder.SRCS+= args.c args.h
vp9_spatial_svc_encoder.SRCS+= ivfenc.c ivfenc.h
vp9_spatial_svc_encoder.SRCS+= tools_common.c tools_common.h
vp9_spatial_svc_encoder.SRCS+= video_common.h
vp9_spatial_svc_encoder.SRCS+= video_writer.h video_writer.c
vp9_spatial_svc_encoder.SRCS+= vpxstats.c vpxstats.h
vp9_spatial_svc_encoder.GUID= 4A38598D-627D-4505-9C7B-D4020C84100D
vp9_spatial_svc_encoder.DESCRIPTION = VP9Spatial SVC Encoder
endif
ifneq($(CONFIG_SHARED),yes)
EXAMPLES-$(CONFIG_VP9_ENCODER)+= resize_util.c
endif
EXAMPLES-$(CONFIG_ENCODERS) += vpx_temporal_svc_encoder.c
vpx_temporal_svc_encoder.SRCS += ivfenc.c ivfenc.h
vpx_temporal_svc_encoder.SRCS += tools_common.c tools_common.h
vpx_temporal_svc_encoder.SRCS += video_common.h
vpx_temporal_svc_encoder.SRCS += video_writer.h video_writer.c
vpx_temporal_svc_encoder.GUID = B18C08F2-A439-4502-A78E-849BE3D60947
vpx_temporal_svc_encoder.DESCRIPTION= Temporal SVC Encoder
EXAMPLES-$(CONFIG_DECODERS)+= simple_decoder.c
simple_decoder.GUID =D3BBF1E9-2427-450D-BBFF-B2843C1D44CC
simple_decoder.SRCS+= ivfdec.h ivfdec.c
simple_decoder.SRCS+= tools_common.htools_common.c
simple_decoder.SRCS+= video_common.h
simple_decoder.SRCS+= video_reader.hvideo_reader.c
simple_decoder.SRCS+= vpx_ports/mem_ops.h
simple_decoder.SRCS+= vpx_ports/mem_ops_aligned.h
simple_decoder.DESCRIPTION = Simplified decoder loop
EXAMPLES-$(CONFIG_DECODERS) += postproc.c
postproc.SRCS += ivfdec.h ivfdec.c
postproc.SRCS += tools_common.htools_common.c
postproc.SRCS += video_common.h
postproc.SRCS += video_reader.h video_reader.c
postproc.SRCS += vpx_ports/mem_ops.h
postproc.SRCS +=vpx_ports/mem_ops_aligned.h
postproc.GUID =65E33355-F35E-4088-884D-3FD4905881D7
postproc.DESCRIPTION = Decoder postprocessor control
EXAMPLES-$(CONFIG_DECODERS) += decode_to_md5.c
decode_to_md5.SRCS+= md5_utils.h md5_utils.c
decode_to_md5.SRCS+= ivfdec.h ivfdec.c
decode_to_md5.SRCS+= tools_common.htools_common.c
decode_to_md5.SRCS+= video_common.h
decode_to_md5.SRCS+= video_reader.hvideo_reader.c
decode_to_md5.SRCS+= vpx_ports/mem_ops.h
decode_to_md5.SRCS+= vpx_ports/mem_ops_aligned.h
decode_to_md5.GUID =59120B9B-2735-4BFE-B022-146CA340FE42
decode_to_md5.DESCRIPTION = Frame by frame MD5 checksum
EXAMPLES-$(CONFIG_ENCODERS) += simple_encoder.c
simple_encoder.SRCS += ivfenc.h ivfenc.c
simple_encoder.SRCS += tools_common.h tools_common.c
simple_encoder.SRCS += video_common.h
simple_encoder.SRCS += video_writer.h video_writer.c
simple_encoder.GUID = 4607D299-8A71-4D2C-9B1D-071899B6FBFD
simple_encoder.DESCRIPTION = Simplified encoder loop
EXAMPLES-$(CONFIG_VP9_ENCODER) += vp9_lossless_encoder.c
vp9_lossless_encoder.SRCS += ivfenc.h ivfenc.c
vp9_lossless_encoder.SRCS += tools_common.h tools_common.c
vp9_lossless_encoder.SRCS += video_common.h
vp9_lossless_encoder.SRCS += video_writer.h video_writer.c
vp9_lossless_encoder.GUID = B63C7C88-5348-46DC-A5A6-CC151EF93366
vp9_lossless_encoder.DESCRIPTION= Simplified lossless VP9 encoder
EXAMPLES-$(CONFIG_ENCODERS)+= twopass_encoder.c
twopass_encoder.SRCS += ivfenc.h ivfenc.c
twopass_encoder.SRCS += tools_common.h tools_common.c
twopass_encoder.SRCS += video_common.h
twopass_encoder.SRCS += video_writer.h video_writer.c
twopass_encoder.GUID=73494FA6-4AF9-4763-8FBB-265C92402FD8
twopass_encoder.DESCRIPTION = Two-pass encoder loop
EXAMPLES-$(CONFIG_DECODERS)+= decode_with_drops.c
decode_with_drops.SRCS += ivfdec.h ivfdec.c
decode_with_drops.SRCS += tools_common.h tools_common.c
decode_with_drops.SRCS += video_common.h
decode_with_drops.SRCS += video_reader.h video_reader.c
decode_with_drops.SRCS += vpx_ports/mem_ops.h
decode_with_drops.SRCS += vpx_ports/mem_ops_aligned.h
decode_with_drops.GUID =CE5C53C4-8DDA-438A-86ED-0DDD3CDB8D26
decode_with_drops.DESCRIPTION = Drops frames while decoding
EXAMPLES-$(CONFIG_ENCODERS) += set_maps.c
set_maps.SRCS += ivfenc.h ivfenc.c
set_maps.SRCS += tools_common.htools_common.c
set_maps.SRCS += video_common.h
set_maps.SRCS += video_writer.hvideo_writer.c
set_maps.GUID =ECB2D24D-98B8-4015-A465-A4AF3DCC145F
set_maps.DESCRIPTION = Set active and ROI maps
EXAMPLES-$(CONFIG_VP8_ENCODER)+= vp8cx_set_ref.c
vp8cx_set_ref.SRCS+= ivfenc.h ivfenc.c
vp8cx_set_ref.SRCS += tools_common.h tools_common.c
vp8cx_set_ref.SRCS+= video_common.h
vp8cx_set_ref.SRCS+= video_writer.hvideo_writer.c
vp8cx_set_ref.GUID =C5E31F7F-96F6-48BD-BD3E-10EBF6E8057A
vp8cx_set_ref.DESCRIPTION = VP8 set encoder reference frame
ifeq($(CONFIG_MULTI_RES_ENCODING),yes)
ifeq($(CONFIG_LIBYUV),yes)
EXAMPLES-$(CONFIG_VP8_ENCODER) += vp8_multi_resolution_encoder.c
vp8_multi_resolution_encoder.SRCS += ivfenc.h ivfenc.c
vp8_multi_resolution_encoder.SRCS += tools_common.h tools_common.c
vp8_multi_resolution_encoder.SRCS += video_writer.h video_writer.c
vp8_multi_resolution_encoder.SRCS += $(LIBYUV_SRCS)
vp8_multi_resolution_encoder.GUID = 04f8738e-63c8-423b-90fa-7c2703a374de
vp8_multi_resolution_encoder.DESCRIPTION= VP8 Multiple-resolution Encoding
endif
endif
# Handleextra library flags depending on codec configuration
编译完整examples（enable-cpu-detect)
../configure --target=armv7-android-gcc --sdk-path=$ARM_ROOT --prefix=/usr/local/android/ --disable-install-docs --extra-cflags="-mfloat-abi=softfp -mfpu=neon " --disable-debug --disable-debug-libs --disable-shared --enable-static --disable-webm-io
移植命令终端到你的Ubuntu桌面：http://www.linuxdiyf.com/linux/6903.html