macOS編譯FFmpeg for Android

1. NDK編譯環境建置
2. 下載FFmpeg Source最新版本
3. 編譯FFmpeg

1. NDK編譯環境建置

至https://developer.android.com/ndk/downloads?hl=de下載最新版本的NDK

此文章使用版本為：android-ndk-r21e

此文章路徑放置：/Users/xxx/android_ndk/android-ndk-r21e

此文章當時使用的MacOS版本：11.5.2

2. 下載FFmpeg Source最新版本

下載FFmpeg Source最新版本，如以下指令

打開終端機

cd ~/

git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg_source_v1

此文章下載的FFmpeg version 4.4

3. 編譯FFmpeg

編譯FFmpeg

a. cd ~/ffmpeg_source_v1

b. ./configure 

完成後會出現License版本(此文章編譯License -> LGPL 2.1)

c. 將下方文字儲存成build_android.sh

./build_android.sh

---

NDK_PATH=/Users/xxx/android_ndk/android-ndk-r21e

HOST_PLATFORM=darwin-x86_64
API=29

TOOLCHAINS="$NDK_PATH/toolchains/llvm/prebuilt/$HOST_PLATFORM"
SYSROOT="$NDK_PATH/toolchains/llvm/prebuilt/$HOST_PLATFORM/sysroot"
CFLAG="-D__ANDROID_API__=$API -Os -fPIC -DANDROID "
LDFLAG="-lc -lm -ldl -llog "

PREFIX=android-build

CONFIG_LOG_PATH=${PREFIX}/log
COMMON_OPTIONS=
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"
    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_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_LDFLAGS="$LDFLAG"
    EXTRA_OPTIONS="--cpu=$CPU "
    ;;
  esac

  echo "----> Start make clean"
  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=$LD"
  CONFIGURATION="$CONFIGURATION $EXTRA_OPTIONS"

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

  echo "----> Start make $APP_ABI"
  make -j10

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

}

build_all() {
  #下方可自行定義，./configure -h可以查看選項內容
  COMMON_OPTIONS="$COMMON_OPTIONS --target-os=android"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-static"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-shared"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-protocols"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-cross-compile"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-optimizations"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-debug"
  COMMON_OPTIONS="$COMMON_OPTIONS --enable-small"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-doc"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-programs"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffmpeg"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffplay"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffprobe"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-symver"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-network"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-x86asm"
  COMMON_OPTIONS="$COMMON_OPTIONS --disable-asm"
  COMMON_OPTIONS="$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="$COMMON_OPTIONS --enable-decoder=h264"
  COMMON_OPTIONS="$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=$COMMON_OPTIONS, PREFIX=$PREFIX, CONFIG_LOG_PATH=$CONFIG_LOG_PATH"

  mkdir -p ${CONFIG_LOG_PATH}

  #編譯成四個平台
  build "armeabi-v7a"
  build "arm64-v8a"
  build "x86"
  build "x86_64"
}

echo "Start build"
build_all
echo "End build"

d. 編譯完成後，在build_android下會生成如此圖

備註：編譯過程中出現，無法打開「arm-linux-androideabi-ranlib」，因為無法驗證開發者。

1. 按打開，如果沒有打開選項，按取消後，就必須至安全性與隱私權->一般->強制允許

2. 只要有按取消，就必須至終端機control+c取消編譯，重頭來，直到沒按取消為止

否則會編譯失敗，因為android-ndk-r21e是網路上下載的

---

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