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FFmpeg 编译静态库

Hanyang Li 2023-05-18 16:00:02

简介FFmpeg 编译静态库

1. 使用工具

1.1 FFmpeg 官网:

1.2 FFmpeg macOS 官方安装教程:

1.3 Homebreaw 安装网站:

2. Homebreaw 介绍

2.1 简称 brew，在 Mac 平台终端上管理软件包，安装，更新，卸载等软件

2.2 安装 brew，终端执行指令(内部安装):

  // ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”
  // /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
  /bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"

2.3 出现安装或者更新问题:

错误：Error: Cannot download non-corrupt https://formulae.brew.sh/api/formula.json!

解决网址: brew upgrade error:

2.4 常用命令

搜索软件 brew search 软件名；安装软件 brew install 软件名；卸载软件 brew remove 软件名；

2.5 安装 FFmpeg（可选项，使用到 ffmpeg 命令行操作，必须安装）

安装完 Homebrew，然后在终端执行指令:

// brew install ffmpeg --with-libvpx --with-libvorbis --with-ffplay
brew install ffmpeg

执行结束，在终端中输入 ffmpeg，验证是否安装成功

3. 编译静态库

3.1 下载 gas-preprocessor 库(自动编译脚本的时候用到)，方法一: 可以手动下载操作，方法二: 命令下载步骤，依次执行下面命令:

// https://github.com/bigsen/gas-preprocessor.git
sudo git clone https://github.com/libav/gas-preprocessor.git /usr/local/bin/gas
sudo cp /usr/local/bin/gas/gas-preprocessor.pl /usr/local/bin/gas-preprocessor.pl
sudo chmod 777 /usr/local/bin/gas-preprocessor.pl
sudo rm -rf /usr/local/bin/gas/

3.2 安装 yams (系统现已找不到 yams 库进行安装，自带有 yaws，可进行安装)

yasm 是汇编编译器，ffmpeg 中提高效率用到了汇编指令，所以编译时需要安装，安装执行下面命令:

 // 报错则执行 sudo brew install yams
 brew install yams

4. 配置编译 FFmpeg 脚本

手动编译 FFmpeg 脚本，有些复杂，这里选择的是 FFmpeg-iOS-build-script，github 一个开源的脚本，个人认为简单而实用，执行脚本会自动从 github 下载 ffmpeg 源码，并开始编译成 iOS 支持各种架构库。

4.1 脚本下载地址，也可手动点击下载

  git clone https://github.com/kewlbear/FFmpeg-iOS-build-script.git

4.2 下载完成后，可自行修改脚本文件，自带脚本：

#!/bin/sh

# directories
FF_VERSION="4.3.1"
#FF_VERSION="snapshot-git"
if [[ $FFMPEG_VERSION != "" ]]; then
  FF_VERSION=$FFMPEG_VERSION
fi
SOURCE="ffmpeg-$FF_VERSION"
FAT="FFmpeg-iOS"

SCRATCH="scratch"
# must be an absolute path
THIN=`pwd`/"thin"

# absolute path to x264 library
#X264=`pwd`/fat-x264

#FDK_AAC=`pwd`/../fdk-aac-build-script-for-iOS/fdk-aac-ios

CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs 
                 --disable-doc --enable-pic"

if [ "$X264" ]
then
    CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"
fi

if [ "$FDK_AAC" ]
then
    CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-libfdk-aac --enable-nonfree"
fi

# avresample
#CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"

ARCHS="arm64 armv7 x86_64 i386"

COMPILE="y"
LIPO="y"

DEPLOYMENT_TARGET="8.0"

if [ "$*" ]
then
    if [ "$*" = "lipo" ]
    then
        # skip compile
        COMPILE=
    else
        ARCHS="$*"
        if [ $# -eq 1 ]
        then
            # skip lipo
            LIPO=
        fi
    fi
fi

if [ "$COMPILE" ]
then
    if [ ! `which yasm` ]
    then
        echo 'Yasm not found'
        if [ ! `which brew` ]
        then
            echo 'Homebrew not found. Trying to install...'
                        ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 
                || exit 1
        fi
        echo 'Trying to install Yasm...'
        brew install yasm || exit 1
    fi
    if [ ! `which gas-preprocessor.pl` ]
    then
        echo 'gas-preprocessor.pl not found. Trying to install...'
        (curl -L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl 
            -o /usr/local/bin/gas-preprocessor.pl 
            && chmod +x /usr/local/bin/gas-preprocessor.pl) 
            || exit 1
    fi

    if [ ! -r $SOURCE ]
    then
        echo 'FFmpeg source not found. Trying to download...'
        curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj 
            || exit 1
    fi

    CWD=`pwd`
    for ARCH in $ARCHS
    do
        echo "building $ARCH..."
        mkdir -p "$SCRATCH/$ARCH"
        cd "$SCRATCH/$ARCH"

        CFLAGS="-arch $ARCH"
        if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
        then
            PLATFORM="iPhoneSimulator"
            CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
        else
            PLATFORM="iPhoneOS"
            CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET -fembed-bitcode"
            if [ "$ARCH" = "arm64" ]
            then
                EXPORT="GASPP_FIX_XCODE5=1"
            fi
        fi

        XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
        CC="xcrun -sdk $XCRUN_SDK clang"

        # force "configure" to use "gas-preprocessor.pl" (FFmpeg 3.3)
        if [ "$ARCH" = "arm64" ]
        then
            AS="gas-preprocessor.pl -arch aarch64 -- $CC"
        else
            AS="gas-preprocessor.pl -- $CC"
        fi

        CXXFLAGS="$CFLAGS"
        LDFLAGS="$CFLAGS"
        if [ "$X264" ]
        then
            CFLAGS="$CFLAGS -I$X264/include"
            LDFLAGS="$LDFLAGS -L$X264/lib"
        fi
        if [ "$FDK_AAC" ]
        then
            CFLAGS="$CFLAGS -I$FDK_AAC/include"
            LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"
        fi

        TMPDIR=${TMPDIR/%/} $CWD/$SOURCE/configure 
            --target-os=darwin 
            --arch=$ARCH 
            --cc="$CC" 
            --as="$AS" 
            $CONFIGURE_FLAGS 
            --extra-cflags="$CFLAGS" 
            --extra-ldflags="$LDFLAGS" 
            --prefix="$THIN/$ARCH" 
        || exit 1

        make -j3 install $EXPORT || exit 1
        cd $CWD
    done
fi

if [ "$LIPO" ]
then
    echo "building fat binaries..."
    mkdir -p $FAT/lib
    set - $ARCHS
    CWD=`pwd`
    cd $THIN/$1/lib
    for LIB in *.a
    do
        cd $CWD
        echo lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB 1>&2
        lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1
    done

    cd $CWD
    cp -rf $THIN/$1/include $FAT
fi

echo Done

4.3 脚本可根据需求修改的地方，如下图：

4.4 编译裁剪库(可选项)

FFmpeg 库很庞大，不进行裁剪，编译出来的库也会很大，根据自身的需求，裁剪部分库中的内容，更改内容是在脚本文件中 CONFIGURE_FLAGS 对应的选项，进行更改之后的脚本: build-ffmpeg-simple.sh

#!/bin/sh

# directories
FF_VERSION="4.3.1"
#FF_VERSION="snapshot-git"
if [[ $FFMPEG_VERSION != "" ]]; then
  FF_VERSION=$FFMPEG_VERSION
fi
SOURCE="ffmpeg-$FF_VERSION"
FAT="FFmpeg-iOS"

SCRATCH="scratch"
# must be an absolute path
THIN=`pwd`/"thin"

# absolute path to x264 library
#X264=`pwd`/fat-x264

#FDK_AAC=`pwd`/../fdk-aac-build-script-for-iOS/fdk-aac-ios

CONFIGURE_FLAGS="--enable-cross-compile 
                 --disable-debug 
                 --disable-programs 
                 --disable-doc 
                 --enable-pic 
                 --enable-small 
                 --enable-gpl 
                 --enable-network 
                 --enable-version3 
                 --disable-ffplay 
                 --disable-ffprobe 
                 --disable-avdevice 
                 --disable-outdevs 
                 --disable-ffmpeg 
                 --disable-postproc 
                 --disable-symver 
                 --disable-stripping 
                 --disable-iconv 
                 --enable-asm 
                 --enable-neon 
                 --enable-zlib 
                 --disable-encoders 
                 --enable-encoder=h264_videotoolbox 
                 --enable-encoder=hevc_videotoolbox 
                 --enable-encoder=aac 
                 --disable-muxers 
                 --enable-muxer=h264 
                 --enable-muxer=hevc 
                 --enable-muxer=rtsp 
                 --enable-muxer=dts 
                 --enable-muxer=adts 
                 --enable-muxer=mp3 
                 --disable-decoders 
                 --enable-decoder=h264 
                 --enable-decoder=hevc 
                 --enable-decoder=aac 
                 --enable-decoder=mp3 
                 --disable-demuxers 
                 --enable-demuxer=h264 
                 --enable-demuxer=hevc 
                 --enable-demuxer=rtsp 
                 --enable-demuxer=sdp 
                 --enable-demuxer=aac 
                 --enable-demuxer=mp3 
                 --disable-parsers 
                 --enable-parser=aac 
                 --enable-parser=h264 
                 --enable-parser=hevc 
                 --disable-protocols 
                 --enable-protocol=tcp 
                 --enable-protocol=file 
                 --enable-protocol=hls 
                 --enable-protocol=concat 
                 --enable-protocol=unix 
                 --disable-filters 
                 --enable-filter=aresample 
                 --enable-filter=asetpts 
                 --enable-filter=setpts 
                 --enable-filter=scale 
                 --enable-filter=concat 
                 --enable-filter=atempo 
                 --enable-filter=movie 
                 --enable-filter=overlay 
                 --enable-filter=rotate 
                 --enable-filter=format 
                 --enable-filter=transpose 
                 --enable-filter=hflip"

if [ "$X264" ]
then
    CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"
fi

if [ "$FDK_AAC" ]
then
    CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-libfdk-aac --enable-nonfree"
fi

# avresample
#CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"

ARCHS="arm64 armv7 x86_64 i386"

COMPILE="y"
LIPO="y"

DEPLOYMENT_TARGET="8.0"

if [ "$*" ]
then
    if [ "$*" = "lipo" ]
    then
        # skip compile
        COMPILE=
    else
        ARCHS="$*"
        if [ $# -eq 1 ]
        then
            # skip lipo
            LIPO=
        fi
    fi
fi

if [ "$COMPILE" ]
then
    if [ ! `which yasm` ]
    then
        echo 'Yasm not found'
        if [ ! `which brew` ]
        then
            echo 'Homebrew not found. Trying to install...'
                        ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 
                || exit 1
        fi
        echo 'Trying to install Yasm...'
        brew install yasm || exit 1
    fi
    if [ ! `which gas-preprocessor.pl` ]
    then
        echo 'gas-preprocessor.pl not found. Trying to install...'
        (curl -L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl 
            -o /usr/local/bin/gas-preprocessor.pl 
            && chmod +x /usr/local/bin/gas-preprocessor.pl) 
            || exit 1
    fi

    if [ ! -r $SOURCE ]
    then
        echo 'FFmpeg source not found. Trying to download...'
        curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj 
            || exit 1
    fi

    CWD=`pwd`
    for ARCH in $ARCHS
    do
        echo "building $ARCH..."
        mkdir -p "$SCRATCH/$ARCH"
        cd "$SCRATCH/$ARCH"

        CFLAGS="-arch $ARCH"
        if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
        then
            PLATFORM="iPhoneSimulator"
            CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
        else
            PLATFORM="iPhoneOS"
            CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET -fembed-bitcode"
            if [ "$ARCH" = "arm64" ]
            then
                EXPORT="GASPP_FIX_XCODE5=1"
            fi
        fi

        XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
        CC="xcrun -sdk $XCRUN_SDK clang"

        # force "configure" to use "gas-preprocessor.pl" (FFmpeg 3.3)
        if [ "$ARCH" = "arm64" ]
        then
            AS="gas-preprocessor.pl -arch aarch64 -- $CC"
        else
            AS="gas-preprocessor.pl -- $CC"
        fi

        CXXFLAGS="$CFLAGS"
        LDFLAGS="$CFLAGS"
        if [ "$X264" ]
        then
            CFLAGS="$CFLAGS -I$X264/include"
            LDFLAGS="$LDFLAGS -L$X264/lib"
        fi
        if [ "$FDK_AAC" ]
        then
            CFLAGS="$CFLAGS -I$FDK_AAC/include"
            LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"
        fi

        TMPDIR=${TMPDIR/%/} $CWD/$SOURCE/configure 
            --target-os=darwin 
            --arch=$ARCH 
            --cc="$CC" 
            --as="$AS" 
            $CONFIGURE_FLAGS 
            --extra-cflags="$CFLAGS" 
            --extra-ldflags="$LDFLAGS" 
            --prefix="$THIN/$ARCH" 
        || exit 1

        make -j5 install $EXPORT || exit 1
        cd $CWD
    done
fi

if [ "$LIPO" ]
then
    echo "building fat binaries..."
    mkdir -p $FAT/lib
    set - $ARCHS
    CWD=`pwd`
    cd $THIN/$1/lib
    for LIB in *.a
    do
        cd $CWD
        echo lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB 1>&2
        lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1
    done

    cd $CWD
    cp -rf $THIN/$1/include $FAT
fi

echo Done

4.5 根据架构进行编译，编译脚本(编译的裁剪版)

1）如果出现权限问题，执行命令

chmod 777 ./build-ffmpeg-simple.sh

2）编译所有版本，执行脚本指令

./build-ffmpeg-simple.sh

编译所有版本，操作如下图:

编译所有版本，scratch 文件夹，如下图:

编译所有版本，thin 文件夹中头文件，如下图:

编译所有版本，thin 文件夹中静态库文件，如下图:

编译所有版本，FFmpeg-iOS 文件夹，如下图:

3）编译 arm64 架构版本，执行脚本指令

./build-ffmpeg-simple.sh arm64

4）编译 armv7 x86_64 i386 架构版本，执行脚本指令

./build-ffmpeg-simple.sh armv7 x86_64 i386

5）lipo 合成库，指令

./build-ffmpeg-simple.sh lipo

lipo 合成库，如把 arm64，x86_64 合并, 操作如图:

lipo 合成库，如把 arm64，x86_64 合并, 合并到文件夹如图:

5. 查看 .a 文件支持的内核架构指令:

lipo -info FFmpeg-iOS/lib/libavcodec.a

查询的结果:

lihanyang@MacBook-Pro FFmpeg % lipo -info FFmpeg-iOS/lib/libavcodec.a
Architectures in the fat file: FFmpeg-iOS/lib/libavcodec.a are: x86_64 arm64

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