Ubuntu 20 交叉编译FFmpeg (Android)-526互联

环境：Ubuntu 20.04.5 LTS

ndk：android-ndk-r21e

https://developer.android.google.cn/ndk/downloads

https://developer.android.com/ndk/guides/other_build_systems?hl=zh-cn

libavutil
libswscale视频图像转换计算模块
libswresample音频转换计算模块
libavcodec编解码板块
libavformat编解码板块
libavdevice各种设备的输入输出
libavfilter滤镜模块

默认支持rtsp

sudo apt-get install nasm
#--enable-gpl 和 --enable-libx264
sudo apt-get install libx264-dev
#--enable-gpl 和 --enable-libx265
sudo apt-get install libx265-dev libnuma-dev
#VP8/VP9 视频编码、解码器  --enable-libvpx
sudo apt-get install libvpx-dev
#AAC 音频编码器  --enable-libfdk-aac  如果配置包含了 --enable-gpl 需要同时添加 --enable-nonfree
sudo apt-get install libfdk-aac-dev
#mp3 音频编码器 --enable-libmp3lame
sudo apt-get install libmp3lame-dev
#Opus音频解码器和编码器 --enable-libopus
sudo apt-get install libopus-dev

ERROR: gnutls not found using pkg-config

sudo apt-get install libunistring-dev

aarch64-linux-android-clang is unable to create an executable file

aarch64-linux-android21-nm: not found

sudo apt-get install binutils

target-os

新版本有target-os支持不需要修改以下部分

target-os=android

# 将 configure 文件中的：
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)'

#替换为：
SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'

配置文件抄作业 NDK 是什么 | FFmpeg 5.0 编译 so 库


#!/bin/bash
# 用于编译android平台的脚本

# NDK所在目录
NDK_PATH=/home/ma/Develop/Android/android-ndk-r24/ # tag1
# macOS 平台编译，其他平台看一下 $NDK_PATH/toolchains/llvm/prebuilt/ 下的文件夹名称
HOST_PLATFORM=linux-x86_64  #tag1
# minSdkVersion
API=23

TOOLCHAINS="$NDK_PATH/toolchains/llvm/prebuilt/$HOST_PLATFORM"
SYSROOT="$NDK_PATH/toolchains/llvm/prebuilt/$HOST_PLATFORM/sysroot"
# 生成 -fpic 与位置无关的代码
CFLAG="-D__ANDROID_API__=$API -Os -fPIC -DANDROID "
LDFLAG="-lc -lm -ldl -llog "

# 输出目录
PREFIX=`pwd`/android-build
# 日志输出目录
CONFIG_LOG_PATH=${PREFIX}/log
# 公共配置
COMMON_OPTIONS=
# 交叉配置
CONFIGURATION=

build() {
  APP_ABI=$1
  echo "======== > Start build $APP_ABI"
  case ${APP_ABI} in
  armeabi-v7a)
    ARCH="arm"
    CPU="armv7-a"
    MARCH="armv7-a"
    TARGET=armv7a-linux-androideabi
    CC="$TOOLCHAINS/bin/$TARGET$API-clang"
    CXX="$TOOLCHAINS/bin/$TARGET$API-clang++"
    LD="$TOOLCHAINS/bin/$TARGET$API-clang"
    # 交叉编译工具前缀
    CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
    EXTRA_CFLAGS="$CFLAG -mfloat-abi=softfp -mfpu=vfp -marm -march=$MARCH "
    EXTRA_LDFLAGS="$LDFLAG"
    EXTRA_OPTIONS="--enable-neon --cpu=$CPU "
    ;;
  arm64-v8a)
    ARCH="aarch64"
    TARGET=$ARCH-linux-android
    CC="$TOOLCHAINS/bin/$TARGET$API-clang"
    CXX="$TOOLCHAINS/bin/$TARGET$API-clang++"
    LD="$TOOLCHAINS/bin/$TARGET$API-clang"
    CROSS_PREFIX="$TOOLCHAINS/bin/$TARGET-"
    EXTRA_CFLAGS="$CFLAG"
    EXTRA_LDFLAGS="$LDFLAG"
    EXTRA_OPTIONS=""
    ;;
  x86)
    ARCH="x86"
    CPU="i686"
    MARCH="i686"
    TARGET=i686-linux-android
    CC="$TOOLCHAINS/bin/$TARGET$API-clang"
    CXX="$TOOLCHAINS/bin/$TARGET$API-clang++"
    LD="$TOOLCHAINS/bin/$TARGET$API-clang"
    CROSS_PREFIX="$TOOLCHAINS/bin/$TARGET-"
    #EXTRA_CFLAGS="$CFLAG -march=$MARCH -mtune=intel -mssse3 -mfpmath=sse -m32"
    EXTRA_CFLAGS="$CFLAG -march=$MARCH  -mssse3 -mfpmath=sse -m32"
    EXTRA_LDFLAGS="$LDFLAG"
    EXTRA_OPTIONS="--cpu=$CPU "
    ;;
  x86_64)
    ARCH="x86_64"
    CPU="x86-64"
    MARCH="x86_64"
    TARGET=$ARCH-linux-android
    CC="$TOOLCHAINS/bin/$TARGET$API-clang"
    CXX="$TOOLCHAINS/bin/$TARGET$API-clang++"
    LD="$TOOLCHAINS/bin/$TARGET$API-clang"
    CROSS_PREFIX="$TOOLCHAINS/bin/$TARGET-"
    #EXTRA_CFLAGS="$CFLAG -march=$CPU -mtune=intel -msse4.2 -mpopcnt -m64"
    EXTRA_CFLAGS="$CFLAG -march=$CPU -msse4.2 -mpopcnt -m64"
    EXTRA_LDFLAGS="$LDFLAG"
    EXTRA_OPTIONS="--cpu=$CPU "
    ;;
  esac

  echo "-------- > Start clean workspace"
  make clean

  echo "-------- > Start build configuration"
  CONFIGURATION="$COMMON_OPTIONS"
  CONFIGURATION="$CONFIGURATION --logfile=$CONFIG_LOG_PATH/config_$APP_ABI.log"
  CONFIGURATION="$CONFIGURATION --prefix=$PREFIX"
  CONFIGURATION="$CONFIGURATION --libdir=$PREFIX/libs/$APP_ABI"
  CONFIGURATION="$CONFIGURATION --incdir=$PREFIX/includes/$APP_ABI"
  CONFIGURATION="$CONFIGURATION --pkgconfigdir=$PREFIX/pkgconfig/$APP_ABI"
  CONFIGURATION="$CONFIGURATION --cross-prefix=$CROSS_PREFIX"
  CONFIGURATION="$CONFIGURATION --arch=$ARCH"
  CONFIGURATION="$CONFIGURATION --sysroot=$SYSROOT"
  CONFIGURATION="$CONFIGURATION --cc=$CC"
  CONFIGURATION="$CONFIGURATION --cxx=$CXX"
  CONFIGURATION="$CONFIGURATION --ld=$LD"
  # nm 和 strip
  CONFIGURATION="$CONFIGURATION --nm=$TOOLCHAINS/bin/llvm-nm"
  CONFIGURATION="$CONFIGURATION --strip=$TOOLCHAINS/bin/llvm-strip"
  CONFIGURATION="$CONFIGURATION $EXTRA_OPTIONS"

  echo "-------- > Start config makefile with $CONFIGURATION --extra-cflags=${EXTRA_CFLAGS} --extra-ldflags=${EXTRA_LDFLAGS}"
  ./configure ${CONFIGURATION} \
  --extra-cflags="$EXTRA_CFLAGS" \
  --extra-ldflags="$EXTRA_LDFLAGS"

  echo "-------- > Start make $APP_ABI with -j1"
  make -j1

  echo "-------- > Start install $APP_ABI"
  make install
  echo "++++++++ > make and install $APP_ABI complete."

}

build_all() {
  #配置开源协议声明
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-gpl"
  #目标android平台
  COMMON_OPTIONS="$COMMON_OPTIONS --target-os=android"
  #取消默认的静态库
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-static"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-shared"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-protocols"
  #开启交叉编译
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-cross-compile"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-optimizations"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-debug"
  #尽可能小
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-small"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-doc"
  #不要命令（执行文件）
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-programs"  # do not build command line programs
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffmpeg"    # disable ffmpeg build
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffplay"    # disable ffplay build
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffprobe"   # disable ffprobe build
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-symver"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-network"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-x86asm"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-asm"
  #启用
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-pthreads"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-mediacodec"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-jni"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-zlib"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-pic"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-muxer=flv"
  #COMMON_OPTIONS="$COMMON_OPTIONS --enable-avresample"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=h264"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=mpeg4"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=mjpeg"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=png"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=vorbis"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=opus"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=flac"
  echo "COMMON_OPTIONS=$COMMON_OPTIONS"
  echo "PREFIX=$PREFIX"
  echo "CONFIG_LOG_PATH=$CONFIG_LOG_PATH"
  mkdir -p ${CONFIG_LOG_PATH}
  build "armeabi-v7a"
  build "arm64-v8a"
  #build "x86"
  #build "x86_64"
}

echo "-------- Start --------"
build_all
echo "-------- End --------"

以上脚本编译4.1也可

[ffbuild/common.mak:60：libavdevice/v4l2.o] 错误 1

#网上的解决方案 追加宏 -DBIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD
--extra-cflags="-Os -fpic -DBIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD" \

我这边无效，改用禁掉v412

#需要使用 v4l2 设备进行视频采集，则需要包含 v4l2 相关库
--disable-indev=v4l2

#avformat_open_input 返回-1330794744

#去掉
--disable-network
#或者可能需要加入
--enable-protocols

target-os

Caused by: java.lang.UnsatisfiedLinkError: dlopen failed: library "libpostproc.so" not found: needed by /data/app/~~hJE0jgI3E9H24Q2eXdepdw==/com.demo.ffmpegdemo-gpt4paZBWGHRh76N_NDrkw==/base.apk!/lib/arm64-v8a/libavfilter.so in namespace classloader-namespace


COMMON_OPTIONS="$COMMON_OPTIONS --enable-postproc"

使用关于 av_register_all avcodec_register_all 过时问题

// 旧的代码：
av_register_all();
// 新的代码：
avformat_network_init();

// 旧的代码：
avcodec_register_all();
// 新的代码：
avformat_network_init();

avcodec_copy_context 过时

// 旧的代码：
avcodec_copy_context(dest_codec_ctx, src_codec_ctx);

// 新的代码：(dest_codec_ctx) 中使用 codecpar 字段，而不是 codec 字段。
avcodec_parameters_copy(dest_codec_ctx->codecpar, src_codec_ctx->codecpar);

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