iOS5 的 FFmpeg

问题描述

有没有人能够使用 iOS5 sdk 编译 ffmpeg 库?我找到了使用 4.3 sdk 但没有用于 iOS5 的脚本.我会假设使用旧 sdk 和 armv7 构建的库仍然与 iOS 5 兼容.

Has anyone been able to compile ffmpeg libraries using the iOS5 sdk? I have found scripts that use the 4.3 sdk but nothing for iOS5. I would assume that libraries built with the old sdk and armv7 will still be compatible for iOS 5.

这是我尝试使用的命令:

Here is the command I am trying to use:

./configure  --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc  --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc'  --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk  --extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/system  --target-os=darwin  --arch=arm  --cpu=cortex-a8  --extra-cflags='-arch armv7'  --extra-ldflags='-arch armv7'  --prefix=compiled/armv7  --enable-pic  --enable-cross-compile  --disable-armv5te  --disable-ffmpeg  --disable-ffplay  --disable-ffserver  --disable-ffprobe  --disable-doc

我也尝试过使用这样的脚本:

I have also tried using a script like this one:

#!/bin/tcsh -f

if (! -d armv7) mkdir armv7
if (! -d lib) mkdir lib

rm armv7/*.a

make clean

./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-cross-compile --arch=arm --target-os=darwin --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk --cpu=cortex-a8 --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7' --enable-pic

make

mv libavcodec/libavcodec.a armv7/
mv libavdevice/libavdevice.a armv7/
mv libavformat/libavformat.a armv7/
mv libavutil/libavutil.a armv7/
mv libswscale/libswscale.a armv7/

rm lib/*.a

cp armv7/*.a lib/

我也尝试切换到 gcc-4.2 以及 llvm-gcc-4.2.但是，我在下面的评论中收到未知选项"错误.

I have also tried to switch to the gcc-4.2 as well as the llvm-gcc-4.2. However I get an "Unknown option" error shown below in the comments.

任何信息都会很好，谢谢.

Any info will be great and thanks.

推荐答案

已更新: 完全改用我使用的脚本的答案.

UPDATED: Completely changed the answer to use the script that I use.

你还需要从 https://github.com/yuvi/gas-preprocessor 下载 gas-preprocessor.pl，把它放在你的路径中并制作它可执行.

You will also need to download gas-preprocessor.pl from https://github.com/yuvi/gas-preprocessor, put it in your path and make it executable.

然后创建一个脚本(比如 make_for_iphone.sh)并把它放进去:

Then create a script (say make_for_iphone.sh) and put this in it:

export PLATFORM="iPhoneOS"
export MIN_VERSION="4.0"
export MAX_VERSION="5.0"
export DEVROOT=/Developer/Platforms/${PLATFORM}.platform/Developer
export SDKROOT=$DEVROOT/SDKs/${PLATFORM}${MAX_VERSION}.sdk
export CC=$DEVROOT/usr/bin/llvm-gcc
export LD=$DEVROOT/usr/bin/ld
export CPP=$DEVROOT/usr/bin/cpp
export CXX=$DEVROOT/usr/bin/llvm-g++
export AR=$DEVROOT/usr/bin/ar
export LIBTOOL=$DEVROOT/usr/bin/libtool
export NM=$DEVROOT/usr/bin/nm
export CXXCPP=$DEVROOT/usr/bin/cpp
export RANLIB=$DEVROOT/usr/bin/ranlib

COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -marm -fPIC"
export LDFLAGS="${COMMONFLAGS} -fPIC"
export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
export CXXFLAGS="${COMMONFLAGS} -fvisibility=hidden -fvisibility-inlines-hidden"

FFMPEG_LIBS="libavcodec libavdevice libavformat libavutil libswscale"

echo "Building armv6..."

make clean
./configure 
    --cpu=arm1176jzf-s 
    --extra-cflags='-arch armv6 -miphoneos-version-min=${MIN_VERSION} -mthumb' 
    --extra-ldflags='-arch armv6 -miphoneos-version-min=${MIN_VERSION}' 
    --enable-cross-compile 
    --arch=arm 
    --target-os=darwin 
    --cc=${CC} 
    --sysroot=${SDKROOT} 
    --prefix=installed 
    --disable-network 
    --disable-decoders 
    --disable-muxers 
    --disable-demuxers 
    --disable-devices 
    --disable-parsers 
    --disable-encoders 
    --disable-protocols 
    --disable-filters 
    --disable-bsfs 
    --enable-decoder=h264 
    --enable-decoder=svq3 
    --enable-gpl 
    --enable-pic 
    --disable-doc
perl -pi -e 's/HAVE_INLINE_ASM 1/HAVE_INLINE_ASM 0/' config.h
make -j3

mkdir -p build.armv6
for i in ${FFMPEG_LIBS}; do cp ./$i/$i.a ./build.armv6/; done

echo "Building armv7..."

make clean
./configure 
    --cpu=cortex-a8 
    --extra-cflags='-arch armv7 -miphoneos-version-min=${MIN_VERSION} -mthumb' 
    --extra-ldflags='-arch armv7 -miphoneos-version-min=${MIN_VERSION}' 
    --enable-cross-compile 
    --arch=arm 
    --target-os=darwin 
    --cc=${CC} 
    --sysroot=${SDKROOT} 
    --prefix=installed 
    --disable-network 
    --disable-decoders 
    --disable-muxers 
    --disable-demuxers 
    --disable-devices 
    --disable-parsers 
    --disable-encoders 
    --disable-protocols 
    --disable-filters 
    --disable-bsfs 
    --enable-decoder=h264 
    --enable-decoder=svq3 
    --enable-gpl 
    --enable-pic 
    --disable-doc
perl -pi -e 's/HAVE_INLINE_ASM 1/HAVE_INLINE_ASM 0/' config.h
make -j3

mkdir -p build.armv7
for i in ${FFMPEG_LIBS}; do cp ./$i/$i.a ./build.armv7/; done

mkdir -p build.universal
for i in ${FFMPEG_LIBS}; do lipo -create ./build.armv7/$i.a ./build.armv6/$i.a -output ./build.universal/$i.a; done

for i in ${FFMPEG_LIBS}; do cp ./build.universal/$i.a ./$i/$i.a; done

make install

这会编译 armv6 和 armv7 版本，并使用 lipo 将它们放入胖库中.它安装到一个文件夹下，您可以在该文件夹下运行脚本，名为 installed.

This compiles both armv6 and armv7 versions and puts them into a fat library using lipo. It installs to a folder underneath where you run the script from called installed.

请注意，目前我不得不使用 perl 内联替换将 HAVE_INLINE_ASM 从 1 更改为 <代码>0.这是因为 gas-preprocessor.pl 的这个问题 - https://github.com/yuvi/gas-preprocessor/issues/16.

Note that at the moment I've had to turn off inline assembly using a perl inline replace to change HAVE_INLINE_ASM from 1 to 0. This is because of this problem with gas-preprocessor.pl - https://github.com/yuvi/gas-preprocessor/issues/16.

另请注意，这已关闭除 H264 解码器之外的所有编码器、解码器、复用器、解复用器等.只需更改配置行以编译您想要的用例.

Also note that this has turned off all encoders, decoders, muxers, demuxers, etc except for the H264 decoder. Just change the configure lines to compile what you want for your use case.

还请记住，这已启用 GPL 代码 - 因此您应该了解这对 iPhone 应用程序意味着什么.如果您不知道，那么您应该阅读相关内容.

Please remember also that this has enabled GPL code - so you should be aware about what that means for iPhone apps. If you're not aware then you should do some reading about that.

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