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
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
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
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
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