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

pacman -S make yasm diffutils pkg-config #在msys2上安裝必要軟件

 #!/bin/sh

NDK_PATH=/c/workspace/android_sdk/ndk/21.1.6352462

BUILD_PLATFORM=windows-x86_64

API=21

ANDROID_ARMV5_CFLAGS="-march=armv5te"
ANDROID_ARMV7_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon"
ANDROID_ARMV8_CFLAGS="-march=armv8-a"
ANDROID_X86_CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
ANDROID_X86_64_CFLAGS="-march=x86-64 -msse4.2 -mpopcnt -m64 -mtune=intel"


# params($1:arch,$2:arch_abi,$3:compiler,$4:cross_prefix,$5:cflags)
build_bin() {

    echo "-------------------star build $2-------------------------"

    ARCH=$1         # arm arm64 x86 x86_64
    # CPU
    ANDROID_ARCH_ABI=$2     # armeabi armeabi-v7a x86 mips

    COMPILER=$3

    PREFIX=$(pwd)/dist/${ANDROID_ARCH_ABI}/

    TOOLCHAIN=${NDK_PATH}/toolchains/llvm/prebuilt/${BUILD_PLATFORM}

    CC=${TOOLCHAIN}/bin/${COMPILER}-clang

    CXX=${TOOLCHAIN}/bin/${COMPILER}-clang++

    SYSROOT=${TOOLCHAIN}/sysroot

    CROSS_PREFIX=${TOOLCHAIN}/bin/$4-

    CFLAGS=$5

    echo "pwd==$(pwd)"
    echo "ARCH==${ARCH}"
    echo "PREFIX==${PREFIX}"
    echo "SYSROOT=${SYSROOT}"
    echo "CFLAGS=${CFLAGS}"
    echo "CC==${CC}"
    echo "CROSS_PREFIX=${CROSS_PREFIX}"

	sh ./configure \
        --prefix=${PREFIX} \
        --enable-neon \
        --enable-hwaccels \
        --enable-gpl \
        --disable-postproc \
        --disable-debug \
        --enable-small \
        --enable-jni \
        --enable-mediacodec \
        --enable-decoder=h264_mediacodec \
        --disable-static \
        --enable-shared \
        --disable-doc \
        --enable-ffmpeg \
        --disable-ffplay \
        --disable-ffprobe \
        --disable-avdevice \
        --disable-doc \
        --disable-symver \
        --target-os=android \
        --arch=${ARCH} \
        --cc=$CC \
        --sysroot=$SYSROOT \
        --enable-cross-compile \
        --cross-prefix=${CROSS_PREFIX} \
        --extra-cflags="-Os -fPIC -DANDROID -Wfatal-errors -Wno-deprecated $CFLAGS" \
        --extra-cxxflags="-D__thumb__ -fexceptions -frtti" \
        --extra-ldflags="-L${SYSROOT}/usr/lib" \

    make clean
    make -j8
    make install


    echo "-------------------$2 build end-------------------------"
}


# build armeabi
# build_bin arm armeabi arm-linux-androideabi arm-linux-androideabi "$ANDROID_ARMV5_CFLAGS"

#build armeabi-v7a
#build_bin arm armeabi-v7a armv7a-linux-androideabi${API} arm-linux-androideabi "$ANDROID_ARMV7_CFLAGS"

#build arm64-v8a
 build_bin arm64 arm64-v8a aarch64-linux-android${API} aarch64-linux-android "$ANDROID_ARMV8_CFLAGS"

#build x86
# build_bin x86 x86 i686-linux-android${API} i686-linux-android "$ANDROID_X86_CFLAGS"

#build x86_64
# build_bin x86_64 x86_64 x86_64-linux-android${API} x86_64-linux-android "$ANDROID_X86_64_CFLAGS"

--cc=CC                  use C compiler CC [$cc_default]
--target-os=OS           compiler targets OS [$target_os]
--enable-shared          build shared libraries [no]

# 設置最小使用版本
cmake_minimum_required(VERSION 3.18.1)

project("demo")

include_directories(include)

# 添加本地so庫 native-lib：這個是聲明引用so庫的名稱 SHARED：表示共享so庫文件
# 構建so庫的源文件
add_library(
        demo
        SHARED
        native-lib.cpp
)

set(SO_DIR ${CMAKE_SOURCE_DIR}/../jniLibs/${ANDROID_ABI})

# 使用系統(tǒng)ndk 提供的庫，如 log庫
# log-lib 這個指定的是在NDK庫中每個類型的庫會存放一個特定的位置，而log庫存放
# 在log-lib中
# log 指定使用log庫
find_library(
        log-lib
        log
)

message("c_CMAKE_SOURCE_DIR:" ${CMAKE_SOURCE_DIR} )

# 加載avcodec-57庫
add_library( avcodec
        SHARED
        IMPORTED)
set_target_properties( avcodec
        PROPERTIES IMPORTED_LOCATION
        ${SO_DIR}/libavcodec.so)

add_library( avutil
        SHARED
        IMPORTED)
set_target_properties( avutil
        PROPERTIES IMPORTED_LOCATION
        ${SO_DIR}/libavutil.so)

add_library( swresample
        SHARED
        IMPORTED)
set_target_properties( swresample
        PROPERTIES IMPORTED_LOCATION
        ${SO_DIR}/libswresample.so)

add_library( avfilter
        SHARED
        IMPORTED)
set_target_properties( avfilter
        PROPERTIES IMPORTED_LOCATION
        ${SO_DIR}/libavfilter.so)

add_library( avformat
        SHARED
        IMPORTED)
set_target_properties( avformat
        PROPERTIES IMPORTED_LOCATION
        ${SO_DIR}/libavformat.so)

add_library( swscale
        SHARED
        IMPORTED)
set_target_properties( swscale
        PROPERTIES IMPORTED_LOCATION
        ${SO_DIR}/libswscale.so)
#----------------------end-----------------------

# 如果你本地的庫（native-lib）想要調用log庫的方法，
# 那么就需要配置這個屬性，意思是把NDK庫關聯(lián)到本地庫。
# 第一個參數(shù)表示本地的庫 native-lib 要調用到log庫的方法，即要被關聯(lián)的庫名稱，log-lib 要關聯(lián)的庫名稱
target_link_libraries(
        demo
        #ffmpeg------start----------
        avcodec
        avutil
        swresample
        avfilter
        avformat
        swscale
        #ffmpeg------end------------
        ${log-lib}
)