ffmpeg for ios 交叉编译 (支持i686 armv7 armv7s) 包含lame支持

http://www.cppblog.com/Khan/archive/2012/12/13/196216.html

由于项目还需要mp3 音频编码,  所以先需要下载lame源码搭建交叉环境, 在lame目录下录入如下编译脚本  

build.sh

 1  # ! /bin/sh
 2 
 3 
 4 SDK_VERSION= " 6.0 "
 5 
 6 rm -rf build
 7  mkdir build
 8 
 9 function build_lame()
10 {
11     make distclean
12 
13     ./configure \
14         CFLAGS= " -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/${SDK}.platform/Developer/SDKs/${SDK}${SDK_VERSION}.sdk " \
15         CC= " /Applications/Xcode.app/Contents/Developer/Platforms/${SDK}.platform/Developer/usr/bin/gcc -arch ${PLATFORM} " \
16         --prefix=/Users/khan/Downloads/lame- 3.99. 5 \
17         --host= " arm-apple-darwin9 " \
18         --disable-shared \
19         --enable-static \
20         --disable-decoder \
21         --disable-frontend
22 
23     make
24     cp  " libmp3lame/.libs/libmp3lame.a "  " build/libmp3lame-${PLATFORM}.a "
25 }
26 
27 PLATFORM= " i686 "
28 SDK= " iPhoneSimulator "
29 build_lame
30 
31  # armv6和armv7 比较难共存
32  #PLATFORM="armv6"
33  #SDK="iPhoneOS"
34  #build_lame
35 
36 PLATFORM= " armv7 "
37 SDK= " iPhoneOS "
38 build_lame
39 
40 PLATFORM= " armv7s "
41 SDK= " iPhoneOS "
42 build_lame
43 
44 lipo -create build/* -output build/libmp3lame.a

首先去https://github.com/yuvi/gas-preprocessor/

下载gas-preprocessor.pl, 然后 复制到 /usr/sbin/目录下(当然, 你可以放在任何目录下, 只要保证--as='/${path}/gas-preprocessor.pl'路径正确)

http://ffmpeg.org/download.html 下载ffmpeg源码, git或者直接下载

终端执行以下指令

#armv7s

./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-pic --enable-cross-compile --enable-decoder=h264 --enable-libmp3lame \

            --arch=arm --disable-asm \

            --target-os=darwin --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \

            --as='gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \

            --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk \

            --cpu=cortex-a8 \

            --extra-cflags='-arch armv7s -I/Users/khan/Downloads/lame-3.99.5/include ' \

            --extra-ldflags='-arch armv7s -L/Users/khan/Downloads/lame-3.99.5/build -lmp3lame  -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk' \

            --prefix=/Users/khan/Downloads/ffmpeg/arm7s.lib
make
make install

make clean

#armv7

./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-pic --enable-cross-compile --enable-decoder=h264 --enable-libmp3lame \

            --disable-asm  --arch=arm \

            --target-os=darwin --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \

            --as='gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \

            --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk \

            --cpu=cortex-a8 \

            --extra-cflags='-arch armv7 -I/Users/khan/Downloads/lame-3.99.5/include ' \

            --extra-ldflags='-arch armv7 -L/Users/khan/Downloads/lame-3.99.5/build -lmp3lame  -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk' \

            --prefix=/Users/khan/Downloads/ffmpeg/arm7.lib
make
make install

make clean

#i686

./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-pic --enable-cross-compile --enable-decoder=h264 --enable-libmp3lame \

            --disable-asm --arch=i686 --cpu=i686 --disable-armv5te \

            --target-os=darwin --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc \

            --as='gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc' \

            --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk \

            --extra-ldflags=-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/usr/lib/system \

            --extra-cflags='-arch i686 -I/Users/khan/Downloads/lame-3.99.5/include ' \

            --extra-ldflags='-arch i686 -L/Users/khan/Downloads/lame-3.99.5/build -lmp3lame ' \

            --prefix=/Users/khan/Downloads/ffmpeg/i686.lib

make
make install
make clean

--prefix=/Users/khan/Downloads/ffmpeg/i686.lib/里为编译后的目标文件
然后将各个目录下的lib lipo一下 就可以同时在模拟器和各种该指令集的真机上运行了

lipo -create i686.lib/lib/libavcodec.a arm7.lib/lib/libavcodec.a arm7s.lib/lib/libavcodec.a       -output build/libavcodec.a

lipo -create i686.lib/lib/libavdevice.a arm7.lib/lib/libavdevice.a arm7s.lib/lib/libavdevice.a    -output build/libavdevice.a

lipo -create i686.lib/lib/libavfilter.a arm7.lib/lib/libavfilter.a arm7s.lib/lib/libavfilter.a           -output build/libavfilter.a

lipo -create i686.lib/lib/libavformat.a arm7.lib/lib/libavformat.a arm7s.lib/lib/libavformat.a  -output build/libavformat.a

lipo -create i686.lib/lib/libavutil.a arm7.lib/lib/libavutil.a arm7s.lib/lib/libavutil.a                 -output build/libavutil.a

lipo -create i686.lib/lib/libswresample.a arm7.lib/lib/libswresample.a arm7s.lib/lib/libswresample.a   -output build/libswresample.a

lipo -create i686.lib/lib/libswscale.a arm7.lib/lib/libswscale.a arm7s.lib/lib/libswscale.a         -output build/libswscale.a