最简单的基于FFmpeg的移动端样例：IOS HelloWorld

这一步用于生成支持armv7、armv7s、arm64、i386、x86_64几种架构的fat版本号的libx264.a。以下这个脚本能够首先编译生成上面5种架构的thin版本号的libx264.a，分成5个目录存储于thin-x264目录中；然后将这些类库合并成为1个fat版本号的libx264.a，存储于fat-x264目录中。

build_x264.sh

#!/bin/sh

# LXH,MXY

#

# directories

SOURCE="x264"

FAT="fat-x264"

SCRATCH="scratch-x264"

# must be an absolute path

THIN=`pwd`/"thin-x264"

#This is decided by your SDK version.

SDK_VERSION="8.3"

cd ./x264

#============== simulator ===============

PLATFORM="iPhoneSimulator"

#i386

ARCHS="i386"

export DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/${PLATFORM}.platform/Developer

export SDKROOT=$DEVROOT/SDKs/${PLATFORM}${SDK_VERSION}.sdk

export CC=$DEVROOT/usr/bin/gcc

export LD=$DEVROOT/usr/bin/ld

export CXX=$DEVROOT/usr/bin/g++

export LIBTOOL=$DEVROOT/usr/bin/libtool

export HOST=i386-apple-darwin

COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -fPIC"

export LDFLAGS="${COMMONFLAGS} -fPIC"

export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"

for ARCH in $ARCHS; do

echo "Building $ARCH ......"

make clean

./configure \

--host=i386-apple-darwin \

--sysroot=$SDKROOT \

--prefix="$THIN/$ARCH" \

--extra-cflags="-arch $ARCH -miphoneos-version-min=6.0" \

--extra-ldflags="-L$SDKROOT/usr/lib/system -arch $ARCH -miphoneos-version-min=6.0" \

--enable-pic \

--enable-static \

--disable-asm \

make && make install && make clean

echo "Installed: $DEST/$ARCH"

done

#x86_64

ARCHS="x86_64"

unset DEVROOT

unset SDKROOT

unset CC

unset LD

unset CXX

unset LIBTOOL

unset HOST

unset LDFLAGS

unset CFLAGS

make clean

for ARCH in $ARCHS; do

echo "Building $ARCH ......"

./configure \

--prefix="$THIN/$ARCH" \

--enable-pic \

--enable-static \

--disable-asm \

make && make install && make clean

echo "Installed: $DEST/$ARCH"

done

#================ iphone ==================

export PLATFORM="iPhoneOS"

ARCHS="arm64 armv7 armv7s "

export DEVROOT=/Applications/Xcode.app/Contents/Developer

export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk

#DEVPATH=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS${SDK_VERSION}.sdk

export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as

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"

for ARCH in $ARCHS; do

echo "Building $ARCH ......"

./configure \

--host=arm-apple-darwin \

--sysroot=$DEVPATH \

--prefix="$THIN/$ARCH" \

--extra-cflags="-arch $ARCH" \

--extra-ldflags="-L$DEVPATH/usr/lib/system -arch $ARCH" \

--enable-pic \

--enable-static \

--disable-asm

make && make install && make clean

echo "Installed: $DEST/$ARCH"

done

cd ..

#================ fat lib ===================

ARCHS="armv7 armv7s i386 x86_64 arm64"

echo "building fat binaries..."

mkdir -p $FAT/lib

set - $ARCHS

CWD=`pwd`

cd $THIN/$1/lib

for LIB in *.a

do

cd $CWD

lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB

done

cd $CWD

cp -rf $THIN/$1/include $FAT

(2) 第三方库libfaac的编译

这一步用于生成支持armv7、armv7s、arm64、i386、x86_64几种架构的fat版本号的libfaac.a。

以下这个脚本能够首先编译生成上面5种架构的thin版本号的libfaac.a，分成5个目录存储于fat-faac中；然后将这些类库合并成为1个fat版本号的libfaac.a。存储于fat-faac中。

build_faac.sh

#!/bin/sh

cd ./faac

make distclean

cd ..

CONFIGURE_FLAGS="--enable-static --with-pic"

ARCHS="arm64 armv7s x86_64 i386 armv7"

# directories

SOURCE="faac"

FAT="fat-faac"

SCRATCH="scratch-faac"

# must be an absolute path

THIN=`pwd`/"thin-faac"

COMPILE="y"

LIPO="y"

if [ "$*" ]

then

if [ "$*" = "lipo" ]

then

# skip compile

COMPILE=

else

ARCHS="$*"

if [ $# -eq 1 ]

then

# skip lipo

LIPO=

fi

fi

fi

if [ "$COMPILE" ]

then

CWD=`pwd`

for ARCH in $ARCHS

do

echo "building $ARCH..."

mkdir -p "$SCRATCH/$ARCH"

cd "$SCRATCH/$ARCH"

if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]

then

PLATFORM="iPhoneSimulator"

CPU=

if [ "$ARCH" = "x86_64" ]

then

SIMULATOR="-mios-simulator-version-min=7.0"

HOST=

else

SIMULATOR="-mios-simulator-version-min=5.0"

HOST="--host=i386-apple-darwin"

fi

else

PLATFORM="iPhoneOS"

if [ $ARCH = "armv7s" ]

then

CPU="--cpu=swift"

else

CPU=

fi

SIMULATOR=

HOST="--host=arm-apple-darwin"

fi

XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`

CC="xcrun -sdk $XCRUN_SDK clang -Wno-error=unused-command-line-argument-hard-error-in-future"

AS="/usr/local/bin/gas-preprocessor.pl $CC"

CFLAGS="-arch $ARCH $SIMULATOR"

CXXFLAGS="$CFLAGS"

LDFLAGS="$CFLAGS"

CC=$CC CFLAGS=$CXXFLAGS LDFLAGS=$LDFLAGS CPPFLAGS=$CXXFLAGS CXX=$CC CXXFLAGS=$CXXFLAGS  $CWD/$SOURCE/configure \

$CONFIGURE_FLAGS \

$HOST \

--prefix="$THIN/$ARCH" \

--disable-shared \

--without-mp4v2

make clean && make && make install-strip

cd $CWD

done

fi

#================ fat lib ===================

echo "building fat binaries..."

mkdir -p $FAT/lib

set - $ARCHS

CWD=`pwd`

cd $THIN/$1/lib

for LIB in *.a

do

cd $CWD

lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB

done

cd $CWD

cp -rf $THIN/$1/include $FAT

(3) 编译armv7版本号FFmpeg类库

这一步用于生成支持armv7架构的thin版本号的FFmpeg类库，存储于thin-ffmpeg/armv7目录中。脚本例如以下所看到的。

build_ffmpeg_demo_armv7.sh

#!/bin/sh

# LXH,MXY modified

cd ffmpeg

PLATFORM="iPhoneOS"

INSTALL="thin-ffmpeg"

SDK_VERSION="8.3"

# libx264

export X264ROOT=../thin-x264/armv7

export X264LIB=$X264ROOT/lib

export X264INCLUDE=$X264ROOT/include

# libfaac

export FAACROOT=../thin-faac/armv7

export FAACLIB=$FAACROOT/lib

export FAACINCLUDE=$FAACROOT/include

export DEVROOT=/Applications/Xcode.app/Contents/Developer

export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk

export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as

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"

echo "Building armv7..."

make clean

./configure \

    --cpu=cortex-a9 \

    --extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch armv7 -miphoneos-version-min=5.0 -mthumb' \

    --extra-ldflags='-L$X264LIB -L$FAACLIB -arch armv7 -miphoneos-version-min=5.0' \

    --enable-cross-compile \

    --arch=arm --disable-iconv\

    --target-os=darwin \

    --cc=${CC} --disable-asm\

    --sysroot=${SDKROOT} \

    --prefix=../${INSTALL}/armv7 \

--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \

--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \

--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \

--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \

--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=mpegts --enable-demuxer=avi --enable-demuxer=mpc --enable-demuxer=mov \

--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \

--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \

--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \

--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug

make

make install

cd ..

(4) 编译armv7s版本号FFmpeg类库

这一步用于生成支持armv7s架构的thin版本号的FFmpeg类库，存储于thin-ffmpeg/armv7s目录中。脚本例如以下所看到的。

build_ffmpeg_demo_armv7s.sh

#!/bin/sh

# LXH,MXY modified

cd ffmpeg

PLATFORM="iPhoneOS"

INSTALL="thin-ffmpeg"

SDK_VERSION="8.3"

# libx264

export X264ROOT=../thin-x264/armv7s

export X264LIB=$X264ROOT/lib

export X264INCLUDE=$X264ROOT/include

# libfaac

export FAACROOT=../thin-faac/armv7s

export FAACLIB=$FAACROOT/lib

export FAACINCLUDE=$FAACROOT/include

export DEVROOT=/Applications/Xcode.app/Contents/Developer

export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk

export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as

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"

echo "Building armv7s..."

make clean

./configure \

    --cpu=cortex-a9 \

    --extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch armv7s -miphoneos-version-min=5.0 -mthumb' \

    --extra-ldflags='-L$X264LIB -L$FAACLIB -arch armv7s -miphoneos-version-min=5.0' \

    --enable-cross-compile \

    --arch=arm --disable-iconv\

    --target-os=darwin \

    --cc=${CC} --disable-asm \

    --sysroot=${SDKROOT} \

    --prefix=../${INSTALL}/armv7s \

--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \

 --disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \

 --disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \

 --disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \

 --disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpegts --enable-demuxer=mpc --enable-demuxer=mov \

 --disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \

 --disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \

 --disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \

 --disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug

make

make install

cd ..

(5) 编译arm64版本号FFmpeg类库

这一步用于生成支持arm64架构的thin版本号的FFmpeg类库，存储于thin-ffmpeg/arm64目录中。

脚本例如以下所看到的。

build_ffmpeg_demo_arm64.sh

#!/bin/sh

# LXH,MXY modified

cd ffmpeg

PLATFORM="iPhoneOS"

INSTALL="thin-ffmpeg"

SDK_VERSION="8.3"

# libx264

export X264ROOT=../thin-x264/arm64

export X264LIB=$X264ROOT/lib

export X264INCLUDE=$X264ROOT/include

# libfaac

export FAACROOT=../thin-faac/arm64

export FAACLIB=$FAACROOT/lib

export FAACINCLUDE=$FAACROOT/include

export DEVROOT=/Applications/Xcode.app/Contents/Developer

export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk

export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as

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"

echo "Building arm64..."

make clean

./configure \

    --extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch arm64 -miphoneos-version-min=5.0 -mthumb' \

    --extra-ldflags='-L$X264LIB -L$FAACLIB -arch arm64 -miphoneos-version-min=5.0' \

    --enable-cross-compile \

    --arch=arm --disable-iconv \

    --target-os=darwin \

    --cc=${CC} --disable-asm \

    --sysroot=${SDKROOT} \

    --prefix=../${INSTALL}/arm64 \

--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \

--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \

--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \

--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \

--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpegts --enable-demuxer=mpc --enable-demuxer=mov \

--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \

--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \

--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \

--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug

make

make install

cd ..

(6) 编译i386版本号FFmpeg类库

这一步用于生成支持i386架构的thin版本号的FFmpeg类库。存储于thin-ffmpeg/i386目录中。

脚本例如以下所看到的。

build_ffmpeg_demo_i386.sh

#!/bin/sh

# LXH,MXY modified

cd ffmpeg

PLATFORM="iPhoneSimulator"

INSTALL="thin-ffmpeg"

SDK_VERSION="8.3"

# libx264

export X264ROOT=../thin-x264/i386

export X264LIB=$X264ROOT/lib

export X264INCLUDE=$X264ROOT/include

# libfaac

export FAACROOT=../thin-faac/i386

export FAACLIB=$FAACROOT/lib

export FAACINCLUDE=$FAACROOT/include

export DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/${PLATFORM}.platform/Developer

export SDKROOT=$DEVROOT/SDKs/${PLATFORM}${SDK_VERSION}.sdk

export CC=$DEVROOT/usr/bin/gcc

export LD=$DEVROOT/usr/bin/ld

export CXX=$DEVROOT/usr/bin/g++

export LIBTOOL=$DEVROOT/usr/bin/libtool

COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -fPIC"

export LDFLAGS="${COMMONFLAGS} -fPIC"

export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"

echo "Building i386..."

make clean

./configure \

    --cpu=i386 \

    --extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch i386 -miphoneos-version-min=5.0' \

    --extra-ldflags='-L$X264LIB -L$FAACLIB -arch i386 -miphoneos-version-min=5.0' \

    --enable-cross-compile \

    --arch=i386 --disable-iconv \

    --target-os=darwin \

    --cc=${CC} \

    --sysroot=${SDKROOT} \

--prefix=../${INSTALL}/i386 \

--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \

--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \

--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=mpegts --enable-muxer=ipod --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \

--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \

--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=mpegts --enable-demuxer=avi --enable-demuxer=mpc --enable-demuxer=mov \

--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \

--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \

--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \

--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug

make

make install

cd ..

(7) 编译x86_64版本号FFmpeg类库

这一步用于生成支持x86_64架构的thin版本号的FFmpeg类库。存储于thin-ffmpeg/x86_64目录中。脚本例如以下所看到的。

build_ffmpeg_demo_x86_64.sh

#!/bin/sh

# LXH,MXY modified

cd ./ffmpeg

INSTALL="thin-ffmpeg"

# libx264

export X264ROOT=../thin-x264/x86_64

export X264LIB=$X264ROOT/lib

export X264INCLUDE=$X264ROOT/include

# libfaac

export FAACROOT=../thin-faac/x86_64

export FAACLIB=$FAACROOT/lib

export FAACINCLUDE=$FAACROOT/include

unset DEVROOT

unset SDKROOT

unset CC

unset LD

unset CXX

unset LIBTOOL

unset HOST

unset LDFLAGS

unset CFLAGS

echo "Building x86_64..."

make clean

./configure \

    --extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE' \

    --extra-ldflags='-L$X264LIB -L$FAACLIB' \

    --disable-iconv \

    --disable-asm \

--prefix=../${INSTALL}/x86_64 \

--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \

--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=mpeg2video --enable-encoder=libfaac \

--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \

--disable-decoders --enable-decoder=aac --enable-decoder=mpeg2video --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \

--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpegts --enable-demuxer=mpc --enable-demuxer=mov \

--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \

--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \

--enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \

--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug

make

make install

cd ..

(8) 打包类库

这一步用于将上述步骤中生成的5个版本号的FFmpeg打包生成fat版本号的FFmpeg类库。这一步骤执行完成后，将thin-ffmpeg中几个thin版本号的类库合并为一个fat版本号的类库。并存储于fat-ffmpeg目录中。

脚本例如以下所看到的。

build_ffmpeg_fat.sh

#!/bin/sh

# directories

THIN=`pwd`/"thin-ffmpeg"

FAT=`pwd`/"fat-ffmpeg"

CWD=`pwd`

# must be an absolute path

ARCHS="armv7s i386 armv7 arm64 x86_64"

echo "building fat binaries..."

mkdir -p $FAT/lib

set - $ARCHS

cd thin-ffmpeg/$1/lib

for LIB in *.a

do

cd $CWD

lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB

done

cd $CWD

cp -rf $THIN/$1/include $FAT

生成完fat版本号的类库后，能够在命令行使用lipo命令查看类库的架构，例如以下所看到的。

lipo -info libavcodec.a

2. 编写IOS程序

编写包括FFmpeg类库支持的IOS程序分成两步：配置Xcode环境，编写C语言代码。

(1) 配置Xcode环境

以下以Xcode的IOS中的Single View Application为例。记录一下配置步骤：

(a) 拷贝头文件所在的include目录和fat版本号的FFmpeg类库（包括libavformat.a， libavcodec.a， libavutil.a， libavdevice.a， libavfilter.a。 libpostproc.a。 libswresample.a， libswscale.a；以及第三方fat版本号类库libx264.a， libfaac.a）至项目目录。并将它们加入至项目中。

(b) 项目属性->Build Settings中配置以下3个选项。

Linking->Other Linker Flags中加入以下内容：

-lavformat

-lavcodec

-lavutil

-lavdevice

-lavfilter

-lpostproc

-lswresample

-lswscale

-lx264

-lfaac

Search Paths->Header Search Paths加入以下内容

$(PROJECT_DIR)/include

Search Paths->Library Search Paths加入以下内容

$(PROJECT_DIR)

其他的一些配置。这些配置随着FFmpeg版本号的不同而有稍微的不同（在某些情况下也可能不须要配置）。

我眼下使用的2.7.1版本号的FFmpeg须要配置以下的选项。
项目属性->General->Linked Frameworks and Libraries中加入两个类库：AVFoundation.framework和libz.dylib。

(2) 编写C语言代码

做好上面配置后。就能够在项目中编写代码測试一下FFmpeg是否正确配置了。

因为IOS使用的Objective-C是兼容C语言的。所以能够直接写C语言代码调用FFmpeg。能够在ViewController.m中的viewDidLoad()函数中加入一行printf()代码打印FFmpeg类库的版本号信息。例如以下所看到的。

#import "ViewController.h"

#include <libavcodec/avcodec.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    printf("%s",avcodec_configuration());

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

假设类库编译无误。启动IOS程序的时候会在控制台打印版本号信息。

源码

项目的目录结构如图所看到的。

C代码位于ViewController.m文件里。内容例如以下所看到的。

/**

 * 最简单的基于FFmpeg的HelloWorld程序 － IOS

 * Simplest FFmpeg Helloworld － IOS

 *

 * 雷霄骅 Lei Xiaohua

 * leixiaohua1020@126.com

 * 中国传媒大学/数字电视技术

 * Communication University of China / Digital TV Technology

 * http://blog.csdn.net/leixiaohua1020

 *

 * 本程序能够获得FFmpeg类库相关的信息。

 * This software can get information about FFmpeg libraries.

 *

 */

#import "ViewController.h"

#include <libavcodec/avcodec.h>

#include <libavformat/avformat.h>

#include <libavfilter/avfilter.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    av_register_all();

    char info[10000] = { 0 };

    printf("%s\n", avcodec_configuration());

    sprintf(info, "%s\n", avcodec_configuration());

    NSString * info_ns = [NSString stringWithFormat:@"%s", info];

    self.content.text=info_ns;

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (IBAction)clickProtocolButton:(id)sender {

    //Alert

    /*

    UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"Title" message:@"This is content" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];

    [alter show];

     */

    char info[40000]={0};

    av_register_all();

    struct URLProtocol *pup = NULL;

    //Input

    struct URLProtocol **p_temp = &pup;

    avio_enum_protocols((void **)p_temp, 0);

    while ((*p_temp) != NULL){

        sprintf(info, "%s[In ][%10s]\n", info, avio_enum_protocols((void **)p_temp, 0));

    }

    pup = NULL;

    //Output

    avio_enum_protocols((void **)p_temp, 1);

    while ((*p_temp) != NULL){

        sprintf(info, "%s[Out][%10s]\n", info, avio_enum_protocols((void **)p_temp, 1));

    }

    //printf("%s", info);

    NSString * info_ns = [NSString stringWithFormat:@"%s", info];

    self.content.text=info_ns;

}

- (IBAction)clickAVFormatButton:(id)sender {

    char info[40000] = { 0 };

    av_register_all();

    AVInputFormat *if_temp = av_iformat_next(NULL);

    AVOutputFormat *of_temp = av_oformat_next(NULL);

    //Input

    while(if_temp!=NULL){

        sprintf(info, "%s[In ]%10s\n", info, if_temp->name);

        if_temp=if_temp->next;

    }

    //Output

    while (of_temp != NULL){

        sprintf(info, "%s[Out]%10s\n", info, of_temp->name);

        of_temp = of_temp->next;

    }

    //printf("%s", info);

    NSString * info_ns = [NSString stringWithFormat:@"%s", info];

    self.content.text=info_ns;

}

- (IBAction)clickAVCodecButton:(id)sender {

    char info[40000] = { 0 };

    av_register_all();

    AVCodec *c_temp = av_codec_next(NULL);

    while(c_temp!=NULL){

        if (c_temp->decode!=NULL){

            sprintf(info, "%s[Dec]", info);

        }

        else{

            sprintf(info, "%s[Enc]", info);

        }

        switch (c_temp->type){

            case AVMEDIA_TYPE_VIDEO:

                sprintf(info, "%s[Video]", info);

                break;

            case AVMEDIA_TYPE_AUDIO:

                sprintf(info, "%s[Audio]", info);

                break;

            default:

                sprintf(info, "%s[Other]", info);

                break;

        }

        sprintf(info, "%s%10s\n", info, c_temp->name);

        c_temp=c_temp->next;

    }

    //printf("%s", info);

    NSString * info_ns = [NSString stringWithFormat:@"%s", info];

    self.content.text=info_ns;

}

- (IBAction)clickAVFilterButton:(id)sender {

    char info[40000] = { 0 };

    avfilter_register_all();

    AVFilter *f_temp = (AVFilter *)avfilter_next(NULL);

    while (f_temp != NULL){

        sprintf(info, "%s[%10s]\n", info, f_temp->name);

    }

    //printf("%s", info);

    NSString * info_ns = [NSString stringWithFormat:@"%s", info];

    self.content.text=info_ns;

}

- (IBAction)clickConfigurationButton:(id)sender {

    char info[10000] = { 0 };

    av_register_all();

    sprintf(info, "%s\n", avcodec_configuration());

    //printf("%s", info);

    //self.content.text=@"Lei Xiaohua";

    NSString * info_ns = [NSString stringWithFormat:@"%s", info];

    self.content.text=info_ns;

}

@end

执行结果

App在手机上执行后的结果例如以下图所看到的。

单击不同的button，能够得到类库不同方面的信息。单击“Protocol”button内容例如以下所看到的。

单击“AVFormat”button内容例如以下所看到的。

单击“AVCodec”button内容例如以下所看到的。

单击“Configure”button即为程序開始执行时候的内容。

下载

simplest ffmpeg mobile

项目主页

Github：https://github.com/leixiaohua1020/simplest_ffmpeg_mobile

开源中国：https://git.oschina.net/leixiaohua1020/simplest_ffmpeg_mobile

SourceForge：https://sourceforge.net/projects/simplestffmpegmobile/

CSDN工程下载地址：http://download.csdn.net/detail/leixiaohua1020/8924391

本解决方式包括了使用FFmpeg在移动端处理多媒体的各种样例：

[Android]
simplest_android_player: 基于安卓接口的视频播放器
simplest_ffmpeg_android_helloworld: 安卓平台下基于FFmpeg的HelloWorld程序
simplest_ffmpeg_android_decoder: 安卓平台下最简单的基于FFmpeg的视频解码器
simplest_ffmpeg_android_decoder_onelib: 安卓平台下最简单的基于FFmpeg的视频解码器-单库版
simplest_ffmpeg_android_streamer: 安卓平台下最简单的基于FFmpeg的推流器
simplest_ffmpeg_android_transcoder: 安卓平台下移植的FFmpeg命令行工具
simplest_sdl_android_helloworld: 移植SDL到安卓平台的最简单程序
[IOS]
simplest_ios_player: 基于IOS接口的视频播放器
simplest_ffmpeg_ios_helloworld: IOS平台下基于FFmpeg的HelloWorld程序
simplest_ffmpeg_ios_decoder: IOS平台下最简单的基于FFmpeg的视频解码器
simplest_ffmpeg_ios_streamer: IOS平台下最简单的基于FFmpeg的推流器
simplest_ffmpeg_ios_transcoder: IOS平台下移植的ffmpeg.c命令行工具
simplest_sdl_ios_helloworld: 移植SDL到IOS平台的最简单程序