Android端获取ffmpeg动态库

参考文章

https://blog.csdn.net/leixiaohua1020/article/details/47008825 雷霄骅

1. 编译环境

• NDK:android-ndk-r15c

• FFMPEG: ffmpeg-3.4.4

• Android P: 21（该环境限制最少21）

• Ubuntu:18.0.1

• 部分安装库

    sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev \ libsdl2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev \ libxcb-xfixes0-dev pkg-config texinfo wget zlib1g-dev
  

2. 下载ffmpeg到本地，配置编译脚本

• 下载到本地，官网：http://ffmpeg.org/

    git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg
    cd ffmpeg
  

• 修改configure文件，方便自动导出熟悉的文件名称

    #修改前，方便.so库自动生成我们熟知的命名
    #SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
    #SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
    #LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
    #SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
    #SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'
    #修改后，
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)' 
    LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"' 
    SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)' 
    SLIB_INSTALL_LINKS='$(SLIBNAME)'

• arm编译脚本如下，替换下面编译平台NDK目录成你自己的

    #!/bin/bash 
    make clean 
    export NDK=/home/felix/wd500g/android-sdk/android-ndk-r14b 
    export SYSROOT=$NDK/platforms/android-21/arch-arm/ 
    export TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 
    export CPU=arm
    export ARCH=arm 
    export PREFIX=$(pwd)/android/$CPU 
    export ADDI_CFLAGS="-marm" 
    ./configure --target-os=linux \
    --prefix=$PREFIX \
    --enable-shared \
    --disable-static \
    --disable-x86asm \
    --arch=arm \
    --disable-doc \
    --disable-symver \
    --enable-gpl \
    --disable-ffplay \
    --disable-ffprobe \
    --disable-ffserver \
    --disable-symver \
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    --enable-cross-compile \
    --sysroot=$SYSROOT \
    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
    --extra-ldflags="$ADDI_CFLAGS" \
     $ADDITIONAL_CONFIGURE_FLAG
    make clean
    make 
    make install

3. 问题修复（限于该环境配置）：

• 将libavcodec/opus_pvq.c文件的变量B0改成b0
• 将libavcodec/hevc_mvs.c文件的变量B0改成b0，xB0改成xb0，yB0改成yb0
• 将libavcodec/aaccoder.c文件B0变量替换成b0

4. 如何裁切

• 推荐一篇很好的翻译文章：ffmpeg configure配置选项

• 通过 --help，可以查看当前配置可以添加或者删除的功能

    /configure --help
  

如下：

Configuration options:
  --disable-static         do not build static libraries [no]
  --enable-shared          build shared libraries [no]
  --enable-small           optimize for size instead of speed
  --disable-runtime-cpudetect disable detecting CPU capabilities at runtime (smaller binary)
  --enable-gray            enable full grayscale support (slower color)
  --disable-swscale-alpha  disable alpha channel support in swscale
  --disable-all            disable building components, libraries and programs
  --disable-autodetect     disable automatically detected external libraries [no]

Program options:
  --disable-programs       do not build command line programs
  --disable-ffmpeg         disable ffmpeg build
  --disable-ffplay         disable ffplay build
  --disable-ffprobe        disable ffprobe build

Documentation options:
  --disable-doc            do not build documentation
  --disable-htmlpages      do not build HTML documentation pages
  --disable-manpages       do not build man documentation pages
  --disable-podpages       do not build POD documentation pages
  --disable-txtpages       do not build text documentation pages

Component options:
  --disable-avdevice       disable libavdevice build
  --disable-avcodec        disable libavcodec build
  --disable-avformat       disable libavformat build
  --disable-swresample     disable libswresample build
  --disable-swscale        disable libswscale build
  --disable-postproc       disable libpostproc build
  --disable-avfilter       disable libavfilter build
  --enable-avresample      enable libavresample build (deprecated) [no]
  --disable-pthreads       disable pthreads [autodetect]
  --disable-w32threads     disable Win32 threads [autodetect]
  --disable-os2threads     disable OS/2 threads [autodetect]
  --disable-network        disable network support [no]
  --disable-dct            disable DCT code
  --disable-dwt            disable DWT code
  --disable-error-resilience disable error resilience code
  --disable-lsp            disable LSP code
  --disable-lzo            disable LZO decoder code
  --disable-mdct           disable MDCT code
  --disable-rdft           disable RDFT code
  --disable-fft            disable FFT code
  --disable-faan           disable floating point AAN (I)DCT code
  --disable-pixelutils     disable pixel utils in libavutil

5. ffmpeg配置不同扩展功能

因为功能分离的缘故，在使用ffmpeg编译集成不同功能时需要下载关联扩展库，如libmp3lame

• 以libmp3lame为例：（不安装报错：ERROR: libmp3lame >= 3.98.3 not found）
  前往MP3lame官网下载：http://lame.sourceforge.net/

安装：

tar zxf lame-3.100.tar.gz 
cd lame-3.100
./configure
make
sudo make install

• 其余的部分扩展功能可以参考官方给出：https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu#RevertingChangesMadebyThisGuide

    An assembler used by some libraries.
    
    cd ~/ffmpeg_sources && \
    wget https://www.nasm.us/pub/nasm/releasebuilds/2.13.03/nasm-2.13.03.tar.bz2 && \
    tar xjvf nasm-2.13.03.tar.bz2 && \
    cd nasm-2.13.03 && \
    ./autogen.sh && \
    PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" && \
    make && \
    make install
    
    Yasm
    
    An assembler used by some libraries.
    
    If your repository provides yasm version ≥ 1.2.0 then you can install that instead of compiling:
    
    sudo apt-get install yasm
    
    Otherwise you can compile:
    
    cd ~/ffmpeg_sources && \
    wget -O yasm-1.3.0.tar.gz https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz && \
    tar xzvf yasm-1.3.0.tar.gz && \
    cd yasm-1.3.0 && \
    ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" && \
    make && \
    make install
    
    libx264
    
    H.264 video encoder. See the H.264 Encoding Guide for more information and usage examples.
    
    Requires ffmpeg to be configured with --enable-gpl --enable-libx264.
    
    If your repository provides libx264-dev version ≥ 118 then you can install that instead of compiling:
    
    sudo apt-get install libx264-dev
    
    Otherwise you can compile:
    
    cd ~/ffmpeg_sources && \
    git -C x264 pull 2> /dev/null || git clone --depth 1 https://git.videolan.org/git/x264 && \
    cd x264 && \
    PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static --enable-pic && \
    PATH="$HOME/bin:$PATH" make && \
    make install
    
    libx265
    
    H.265/HEVC video encoder. See the H.265 Encoding Guide for more information and usage examples.
    
    If your repository provides libx265-dev version ≥ 68 then you can install that instead of compiling:
    
    sudo apt-get install libx265-dev libnuma-dev
    
    Otherwise you can compile:
    
    sudo apt-get install mercurial libnuma-dev && \
    cd ~/ffmpeg_sources && \
    if cd x265 2> /dev/null; then hg pull && hg update; else hg clone https://bitbucket.org/multicoreware/x265; fi && \
    cd x265/build/linux && \
    PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED=off ../../source && \
    PATH="$HOME/bin:$PATH" make && \
    make install
    
    libvpx
    
    VP8/VP9 video encoder/decoder. See the VP9 Video Encoding Guide for more information and usage examples.
    
    Requires ffmpeg to be configured with --enable-libvpx.
    
    If your repository provides libvpx-dev version ≥ 1.4.0 then you can install that instead of compiling:
    
    sudo apt-get install libvpx-dev
    
    Otherwise you can compile:
    
    cd ~/ffmpeg_sources && \
    git -C libvpx pull 2> /dev/null || git clone --depth 1 https://chromium.googlesource.com/webm/libvpx.git && \
    cd libvpx && \
    PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-vp9-highbitdepth --as=yasm && \
    PATH="$HOME/bin:$PATH" make && \
    make install
    
    libfdk-aac
    
    AAC audio encoder. See the AAC Audio Encoding Guide for more information and usage examples.
    
    Requires ffmpeg to be configured with --enable-libfdk-aac (and --enable-nonfree if you also included --enable-gpl).
    
    If your repository provides libfdk-aac-dev then you can install that instead of compiling:
    
    sudo apt-get install libfdk-aac-dev
    
    Otherwise you can compile:
    
    cd ~/ffmpeg_sources && \
    git -C fdk-aac pull 2> /dev/null || git clone --depth 1 https://github.com/mstorsjo/fdk-aac && \
    cd fdk-aac && \
    autoreconf -fiv && \
    ./configure --prefix="$HOME/ffmpeg_build" --disable-shared && \
    make && \
    make install
    
    libmp3lame
    
    MP3 audio encoder.
    
    Requires ffmpeg to be configured with --enable-libmp3lame.
    
    If your repository provides libmp3lame-dev version ≥ 3.98.3 then you can install that instead of compiling:
    
    sudo apt-get install libmp3lame-dev
    
    Otherwise you can compile:
    
    cd ~/ffmpeg_sources && \
    wget -O lame-3.100.tar.gz https://downloads.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz && \
    tar xzvf lame-3.100.tar.gz && \
    cd lame-3.100 && \
    PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm && \
    PATH="$HOME/bin:$PATH" make && \
    make install
    
    libopus
    
    Opus audio decoder and encoder.
    
    Requires ffmpeg to be configured with --enable-libopus.
    
    If your repository provides libopus-dev version ≥ 1.1 then you can install that instead of compiling:
    
    sudo apt-get install libopus-dev
    
    Otherwise you can compile:
    
    cd ~/ffmpeg_sources && \
    git -C opus pull 2> /dev/null || git clone --depth 1 https://github.com/xiph/opus.git && \
    cd opus && \
    ./autogen.sh && \
    ./configure --prefix="$HOME/ffmpeg_build" --disable-shared && \
    make && \
    make install
    
    libaom
    
    AV1 video encoder/decoder:
    
    cd ~/ffmpeg_sources && \
    git -C aom pull 2> /dev/null || git clone --depth 1 https://aomedia.googlesource.com/aom && \
    mkdir aom_build && \
    cd aom_build && \
    PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED=off -DENABLE_NASM=on ../aom && \
    PATH="$HOME/bin:$PATH" make && \
    make install
    
    FFmpeg
    
    cd ~/ffmpeg_sources && \
    wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
    tar xjvf ffmpeg-snapshot.tar.bz2 && \
    cd ffmpeg && \
    PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
      --prefix="$HOME/ffmpeg_build" \
      --pkg-config-flags="--static" \
      --extra-cflags="-I$HOME/ffmpeg_build/include" \
      --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
      --extra-libs="-lpthread -lm" \
      --bindir="$HOME/bin" \
      --enable-gpl \
      --enable-libaom \
      --enable-libass \
      --enable-libfdk-aac \
      --enable-libfreetype \
      --enable-libmp3lame \
      --enable-libopus \
      --enable-libvorbis \
      --enable-libvpx \
      --enable-libx264 \
      --enable-libx265 \
      --enable-nonfree && \
    PATH="$HOME/bin:$PATH" make && \
    make install && \
    hash -r
    
    Now re-login or run the following command for your current shell session to recognize the new ffmpeg location:
    
    source ~/.profile
    
    Compilation and installation are now complete and ffmpeg (also ffplay, ffprobe, lame, x264, & x265) should now be ready to use. The rest of this guide shows how to update or remove FFmpeg.