基于Android O8.1的ffmpeg NDK 开发 - 1 - Hello World！

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#!/bin/bash
PLATFORM=/xxx/android-ndk-r14b/platforms/android-19/arch-arm/
TOOLCHAIN=/xxx/android-ndk-r14b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
PREFIX=./android/armeabi-v7a


function build_android
{
./configure 
--prefix=$PREFIX 
--target-os=android 
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- 
--arch=arm 
--sysroot=$PLATFORM 
--cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc 
--nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm 
--disable-shared 
--disable-ffmpeg 
--disable-ffplay 
--disable-ffprobe 
--disable-doc 
--disable-symver 
--enable-small 
--enable-gpl 
--enable-asm 
--enable-jni 
--enable-mediacodec 
--enable-decoder=h264_mediacodec 
--enable-hwaccel=h264_mediacodec 
--enable-decoder=hevc_mediacodec 
--enable-decoder=mpeg4_mediacodec 
--enable-decoder=vp8_mediacodec 
--enable-decoder=vp9_mediacodec 
--enable-nonfree 
--enable-version3 
--extra-cflags="-Os -fpic $ADDI_CFLAGS -I$PLATFORM/usr/include" 
--extra-ldflags="$ADDI_LDFLAGS" 
$ADDITIONAL_CONFIGURE_FLAG


make clean
make -j8
make install


$TOOLCHAIN/bin/arm-linux-androideabi-ld 
-rpath-link=$PLATFORM/usr/lib 
-L$PLATFORM/usr/lib 
-L$PREFIX/lib 
-soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o 
$PREFIX/libffmpeg.so 
libavcodec/libavcodec.a 
libavfilter/libavfilter.a 
libswresample/libswresample.a 
libavformat/libavformat.a 
libavutil/libavutil.a 
libswscale/libswscale.a 
libavdevice/libavdevice.a 
libpostproc/libpostproc.a 
-lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker 
$TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a
}

# arm v7vfp
CPU=arm
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
ADDI_CFLAGS="-marm"
build_android

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#/bin/bash
PLATFORM=/xxx/android-ndk-r14b/platforms/android-21/arch-arm64/
TOOLCHAIN=/xxx/android-ndk-r14b/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64
PREFIX=./android/arm64-v8a


function build_android
{
./configure 
--prefix=$PREFIX 
--target-os=android 
--cross-prefix=$TOOLCHAIN/bin/aarch64-linux-android- 
--arch=aarch64 
--sysroot=$PLATFORM 
--cc=$TOOLCHAIN/bin/aarch64-linux-android-gcc 
--nm=$TOOLCHAIN/bin/aarch64-linux-android-nm 
--disable-shared 
--enable-static 
--disable-ffmpeg 
--disable-ffplay 
--disable-ffprobe 
--disable-doc 
--disable-symver 
--enable-small 
--enable-gpl 
--enable-asm 
--enable-jni 
--enable-mediacodec 
--enable-decoder=h264_mediacodec 
--enable-hwaccel=h264_mediacodec 
--enable-decoder=hevc_mediacodec 
--enable-decoder=mpeg4_mediacodec 
--enable-decoder=vp8_mediacodec 
--enable-decoder=vp9_mediacodec 
--enable-nonfree 
--enable-version3 
--extra-cflags="-Os -fpic $ADDI_CFLAGS -I$PLATFORM/usr/include" 
--extra-ldflags="$ADDI_LDFLAGS" 
$ADDITIONAL_CONFIGURE_FLAG


make clean
make -j8
make install


$TOOLCHAIN/bin/aarch64-linux-android-ld 
-rpath-link=$PLATFORM/usr/lib 
-L$PLATFORM/usr/lib 
-L$PREFIX/lib 
-soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o 
$PREFIX/libffmpeg.so 
libavcodec/libavcodec.a 
libavfilter/libavfilter.a 
libswresample/libswresample.a 
libavformat/libavformat.a 
libavutil/libavutil.a 
libswscale/libswscale.a 
libavdevice/libavdevice.a 
libpostproc/libpostproc.a 
-lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker 
$TOOLCHAIN/lib/gcc/aarch64-linux-android/4.9.x/libgcc.a
}

# arm64-v8a 
CPU=arm64-v8a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -march=$CPU "
build_android

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ndk {
            abiFilters 'armeabi-v7a', 'arm64-v8a'
        }

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#CMake版本信息
cmake_minimum_required(VERSION 3.4.1)

#ffmpeg so文件路径
set(lib_src_DIR ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

#配置加载native依赖
include_directories(${CMAKE_SOURCE_DIR}/src/main/jniLibs/include)

#动态方式加载ffmepg的so文件 第三方库加载方式
add_library(ffmpeg SHARED IMPORTED)

#引入libffmpeg.so文件
set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION
${lib_src_DIR}/libffmpeg.so)

#CPP文件夹下待编译的c文件
add_library(native-lib SHARED ${CMAKE_SOURCE_DIR}/src/main/cpp/native-lib.cpp)

#C 日志 ndk官方库
find_library(log-lib log)

#静态库与动态库进行链接 相当于gcc命令行参数 -l。
target_link_libraries(native-lib
                      android
                      ffmpeg
                      ${log-lib})

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extern "C"
JNIEXPORT jstring JNICALL
Java_com_example_nxf31081_ffmpeg_1demo_11_MainActivity_string2FromJNI(JNIEnv *env,
                                                                      jobject instance) {

    // TODO


    return env->NewStringUTF(returnValue);
}

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JNIEXPORT jstring JNICALL
Java_com_example_nxf31081_ffmpeg_1android_1demo_11_MainActivity_string2FromJNI(JNIEnv *env,
                                                                               jobject instance) {

    // TODO
    char info[10000] = {0};
    sprintf(info, "%s n", avcodec_configuration());


    return env->NewStringUTF(info);
}

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tv.setText(string2FromJNI());