Mac 下使用 NDK 交叉编译 ffmpeg

2023-02-01 本文已影响0人 __Y_Q

编译环境如下:

电脑 Mac Os 13.1
NDK 版本: android-ndk-r17c
ffmpeg 版本: ffmpeg-4.1.2

( 开发环境都是最新的, 编译环境可以不需要最新 )

直接使用 github 上的一个 shell 脚本, 就可以编译出多 CPU 架构的动/静态库

可以在配置中, 可以去掉一些不需要编译进来的文件.

在编译过程中正常, 但是在测试使用的时候, 发现一直报错.

extern "C"{
    #include <libavutil/avutil.h>
}


extern "C" JNIEXPORT jstring JNICALL
Java_com_aaatest_studyffmpeg_MainActivity_stringFromJNI(JNIEnv* env, jobject thisz) {
    std::string hello = "Hello from C++ ffmpeg version = ";
    hello.append(av_version_info());
    return env->NewStringUTF(hello.c_str());
}

很简单的一段代码, 报错 undefined reference to 'stderr' . 晚上找了解决方案, 需要在脚本的 --extra-cflags 中加上 -D__ANDROID_API__=21 这个21和脚本中 PLATFORM=android-21 对应.

脚本如下, 有点长, 配置项里面,只打了 arm64-v8a 架构的静态库. 剩下的都没有改动.

#!/usr/bin/env bash

NDK_HOME=/Users/yaqi/Library/Android/sdk/ndk/17.2.4988734
PREFIX=android-build
HOST_PLATFORM=darwin-x86_64
PLATFORM=android-21
PLATFORM_64=android-21

CONFIG_LOG_PATH=${PREFIX}/log
COMMON_OPTIONS=
CONFIGURATION=

build(){
    APP_ABI=$1
    echo "======== > Start build $APP_ABI"
    case ${APP_ABI} in
    # armeabi )
    #     ARCH="arm"
    #     CPU="armv6"
    #     MARCH="armv6"
    #     TOOLCHAINS="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/$HOST_PLATFORM"
    #     CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
    #     SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-arm"
    #     EXTRA_CFLAGS="-march=$MARCH"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -mfloat-abi=softfp -mfpu=vfp"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/arm-linux-androideabi"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
    #     EXTRA_LDFLAGS="-lc -lm -ldl -llog"
    #     EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
    #     EXTRA_OPTIONS="--disable-x86asm"
    # ;;
    # armeabi-v7a )
    #     ARCH="arm"
    #     CPU="armv7-a"
    #     MARCH="armv7-a"
    #     TOOLCHAINS="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/$HOST_PLATFORM"
    #     CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
    #     SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-arm"
    #     EXTRA_CFLAGS="-march=$MARCH"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -mfloat-abi=softfp -mfpu=vfpv3-d16"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/arm-linux-androideabi"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
    #     EXTRA_LDFLAGS="-lc -lm -ldl -llog"
    #     EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--fix-cortex-a8"
    #     EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
    #     EXTRA_OPTIONS="--enable-neon --disable-x86asm"
    # ;;
    arm64-v8a )
        ARCH="aarch64"
        CPU="armv8-a"
        MARCH="armv8-a"
        TOOLCHAINS="$NDK_HOME/toolchains/aarch64-linux-android-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/aarch64-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM_64/arch-arm64"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/aarch64-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--enable-neon --disable-x86asm"
    ;;
    # x86 )
    #     ARCH="x86"
    #     CPU="i686"
    #     MARCH="i686"
    #     TOOLCHAINS="$NDK_HOME/toolchains/x86-4.9/prebuilt/$HOST_PLATFORM"
    #     CROSS_PREFIX="$TOOLCHAINS/bin/i686-linux-android-"
    #     SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-x86"
    #     EXTRA_CFLAGS="-march=$MARCH"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -mtune=intel -mssse3 -mfpmath=sse -m32"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/i686-linux-android"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
    #     EXTRA_LDFLAGS="-lc -lm -ldl -llog"
    #     EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
    #     EXTRA_OPTIONS="--disable-asm"
    # ;;
    # x86_64 )
    #     ARCH="x86_64"
    #     CPU="x86_64"
    #     MARCH="x86-64"
    #     TOOLCHAINS="$NDK_HOME/toolchains/x86_64-4.9/prebuilt/$HOST_PLATFORM"
    #     CROSS_PREFIX="$TOOLCHAINS/bin/x86_64-linux-android-"
    #     SYSROOT="$NDK_HOME/platforms/$PLATFORM_64/arch-x86_64"
    #     EXTRA_CFLAGS="-march=$MARCH"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -mtune=intel -msse4.2 -mpopcnt -m64"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/x86_64-linux-android"
    #     EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
    #     EXTRA_LDFLAGS="-lc -lm -ldl -llog"
    #     EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib64 -L$SYSROOT/usr/lib64"
    #     EXTRA_OPTIONS="--disable-asm"
    # ;;
    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 --arch=$ARCH"
    CONFIGURATION="$CONFIGURATION --cpu=$CPU"
    CONFIGURATION="$CONFIGURATION --cross-prefix=$CROSS_PREFIX"
    CONFIGURATION="$CONFIGURATION --sysroot=$SYSROOT"
    CONFIGURATION="$CONFIGURATION --extra-ldexeflags=-pie"
    CONFIGURATION="$CONFIGURATION $EXTRA_OPTIONS"

    echo "-------- > Start config makefile with $CONFIGURATION --extra-cflags="${EXTRA_CFLAGS}" --extra-ldflags="${EXTRA_LDFLAGS}""
    ./configure ${CONFIGURATION} \
        --extra-cflags="$EXTRA_CFLAGS -D__ANDROID_API__=21" \
        --extra-ldflags="$EXTRA_LDFLAGS"

    echo "-------- > Start make $APP_ABI with -j8"
    make j8

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

}

build_all(){

    COMMON_OPTIONS="$COMMON_OPTIONS --target-os=android"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-static"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-shared"
    COMMON_OPTIONS="$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 --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="$COMMON_OPTIONS --enable-avresample"
    COMMON_OPTIONS="$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 $app_abi
     #build "armeabi"
     #build "armeabi-v7a"
     build "arm64-v8a"
     #build "x86"
     #build "x86_64"
}

echo "-------- Start --------"

build_all

echo "-------- End --------"

工程目录结构如下 :

cpp -> arm64-v8a 存放的是静态库文件
cpp -> includes 下存放的是头文件

CMakeList.txt 内容如下


cmake_minimum_required(VERSION 3.22.1)
project("studyffmpeg")
#导入头文件
include_directories(${CMAKE_SOURCE_DIR}/includes)
#导入静态库
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -L${CMAKE_SOURCE_DIR}/arm64-v8a")


add_library( # Sets the name of the library.
        studyffmpeg
        SHARED
        native-lib.cpp)

#这里的几个库文件顺序最好别搞错.
target_link_libraries(
        studyffmpeg
        avformat
        avcodec
        avdevice
        avfilter
        avutil
        swresample
        swscale
        log)

Mac 下使用 NDK 交叉编译 ffmpeg

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