FFmpeg ndk交叉编译，集成到android

1. 软件版本

1.1 ndk android-ndk-r15c

1.2 ffmepg ffmpeg-4.0.5.tar.bz2

1.3 x264 x264-stable.tar.gz

2. 编译x264静态库

tar -zxvf x264-stable.tar.gz

mv x264-stable x264

vi build.sh

#!/bin/bash
NDK=/home/sheng/ndk/android-ndk-r15c

configure()
{
   CPU=$1
   PREFIX=$(pwd)/android/$CPU
   HOST=""
   CROSS_PREFIX=""
   SYSROOT=""
   if [ "$CPU" == "armv7-a" ]
   then
       HOST=arm-linux
       SYSROOT=$NDK/platforms/android-21/arch-arm/
       CROSS_PREFIX=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
   else
       HOST=aarch64-linux
       SYSROOT=$NDK/platforms/android-21/arch-arm64/
       CROSS_PREFIX=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-
   fi
   ./configure \
       --prefix=$PREFIX \
       --host=$HOST \
       --enable-pic \
       --enable-static \
       --enable-neon \
       --extra-cflags="-fPIE -pie" \
       --extra-ldflags="-fPIE -pie" \
       --cross-prefix=$CROSS_PREFIX \
       --sysroot=$SYSROOT
}

build()
{
   make clean
   cpu=$1
   echo "build $cpu"

   configure $cpu
   #-j<CPU核心数>
   make -j4
   make install
}

build arm64
build armv7-a

sudo chmod 777 build.sh

./build.sh

3. 编译ffmpeg静态库

tar -jxvf ffmpeg-4.0.5.tar.bz2

cp ../x264 ffmpeg-4.0.5/x264

vi build.sh

#!/bin/bash
NDK=/home/sheng/ndk/android-ndk-r15c
ADDI_CFLAGS="-fPIE -pie"
ADDI_LDFLAGS="-fPIE -pie"

configure()
{
   CPU=$1
   PREFIX=$(pwd)/android/$CPU
   x264=$(pwd)/x264/android/$CPU
   HOST=""
   CROSS_PREFIX=""
   SYSROOT=""
   ARCH=""
   if [ "$CPU" == "armv7-a" ]
   then
       ARCH="arm"
       HOST=arm-linux
       SYSROOT=$NDK/platforms/android-21/arch-arm/
       CROSS_PREFIX=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
   else
       ARCH="aarch64"
       HOST=aarch64-linux
       SYSROOT=$NDK/platforms/android-21/arch-arm64/
       CROSS_PREFIX=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-
   fi
   ./configure \
       --prefix=$PREFIX \
       --enable-small \
       --disable-programs \
       --disable-encoders \
       --disable-muxers \
       --disable-filters \
       --disable-decoders \
       --disable-avdevice \
       --disable-doc \
       --disable-ffplay \
       --disable-network \
       --disable-doc \
       --disable-symver \
       --enable-neon \
       --enable-libx264 \
       --enable-gpl \
       --enable-pic \
       --enable-jni \
       --enable-pthreads \
       --enable-mediacodec \
       --enable-encoder=aac \
       --enable-encoder=gif \
       --enable-encoder=libopenjpeg \
       --enable-encoder=libmp3lame \
       --enable-encoder=libwavpack \
       --enable-encoder=libx264 \
       --enable-encoder=mpeg4 \
       --enable-encoder=pcm_s16le \
       --enable-encoder=png \
       --enable-encoder=srt \
       --enable-encoder=subrip \
       --enable-encoder=yuv4 \
       --enable-encoder=text \
       --enable-decoder=aac \
       --enable-decoder=aac_latm \
       --enable-decoder=libopenjpeg \
       --enable-decoder=mp3 \
       --enable-decoder=mpeg4_mediacodec \
       --enable-decoder=pcm_s16le \
       --enable-decoder=flac \
       --enable-decoder=flv \
       --enable-decoder=gif \
       --enable-decoder=png \
       --enable-decoder=srt \
       --enable-decoder=xsub \
       --enable-decoder=yuv4 \
       --enable-decoder=vp8_mediacodec \
       --enable-decoder=h264_mediacodec \
       --enable-decoder=hevc_mediacodec \
       --enable-hwaccel=h264_mediacodec \
       --enable-hwaccel=mpeg4_mediacodec \
       --enable-ffmpeg \
       --enable-bsf=aac_adtstoasc \
       --enable-bsf=h264_mp4toannexb \
       --enable-bsf=hevc_mp4toannexb \
       --enable-bsf=mpeg4_unpack_bframes \
       --enable-cross-compile \
       --cross-prefix=$CROSS_PREFIX \
       --disable-shared \
       --enable-static \
       --target-os=android \
       --arch=$ARCH \
       --sysroot=$SYSROOT \
       --extra-cflags="-I$x264/include $ADDI_CFLAGS" \
       --extra-ldflags="-L$x264/lib"
}

build()
{
   make clean
   cpu=$1
   echo "build $cpu"

   configure $cpu
   make -j4
   make install
}

build arm64
build armv7-a

sudo chmod 777 build.sh

./build.sh

4. 在windows打开当前目录拷文件到 android studio 工程

explorer.exe .

4.1 拷 ffmpeg include

/ffmpeg-4.0.5/android/arm64/include

\app\src\main\cpp\include

4.2 拷 ffmpeg a

/ffmpeg-4.0.5/android/arm64/lib

\app\src\main\cpp\libs

4.3 修改app 的build.gradle

externalNativeBuild {
    cmake {
        cppFlags "-std=c++11"
        abiFilters "armeabi-v7a" , "arm64-v8a"
    }
}

4.5 修改app 的 CMakeLists.txt

cmake_minimum_required(VERSION 3.4.1)

include_directories(${CMAKE_SOURCE_DIR}/include)


add_library(
        native-lib
        SHARED
        native-lib.cpp)

add_library(static-lib
        STATIC
        IMPORTED
        )
set_target_properties(static-lib
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libstatic-lib.a )

#add libavcodec
add_library(libavcodec
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libavcodec
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libavcodec.a
)

#add libavfilter
add_library(libavfilter
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libavfilter
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libavfilter.a
)


#add libavformat
add_library(libavformat
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libavformat
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libavformat.a
)


#add libavutil
add_library(libavutil
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libavutil
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libavutil.a
)


#add libpostproc
add_library(libpostproc
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libpostproc
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libpostproc.a
)

#add libswresample
add_library(libswresample
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libswresample
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libswresample.a
)

#add libswscale
add_library(libswscale
        STATIC
        IMPORTED
        )

SET_TARGET_PROPERTIES(
        libswscale
        PROPERTIES IMPORTED_LOCATION
        ${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}/libswscale.a
)






find_library(
        log-lib
        log)

target_link_libraries(
        native-lib

        static-lib
        libavcodec
        libswscale
        libswresample
        libpostproc
        libavutil
        libavformat
        libavfilter

        ${log-lib})

4.6 修改cpp 测试调用成功

#include <jni.h>
#include <string>
#include<android/log.h>
#include "static.h"



#define  LOG_TAG    "native-lib"
#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
#define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)

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

extern "C" JNIEXPORT jstring JNICALL
Java_com_jbgf_naivesotest_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    //---------------------新增--------------------
    int x = 0;
    x = apple();
    LOGI("x = %d", x);
    //----------------------------------------------
    return env->NewStringUTF(av_version_info());
}

extern "C"
JNIEXPORT jbyteArray JNICALL
Java_com_jbgf_naivesotest_MainActivity_bytesFromJNI(JNIEnv *env, jobject thiz) {
    jbyte byteA[8];
    byteA[0] = 1;
    byteA[1] = 1;
    byteA[2] = 1;
    byteA[3] = 1;
    byteA[4] = 1;
    byteA[5] = 1;
    byteA[6] = 1;
    byteA[7] = 1;



    jbyteArray jByteArray= env->NewByteArray(8);
    env->SetByteArrayRegion(jByteArray,0,8,byteA);
    return jByteArray;
}


extern "C"
JNIEXPORT jbyteArray JNICALL
Java_com_jbgf_naivesotest_MainActivity_bytesFromJNI2(JNIEnv *env, jobject thiz,
                                                     jbyteArray byte_frame) {
    //1.获取数组和数组长度
    jbyte *c_array = env->GetByteArrayElements(byte_frame,JNI_FALSE);
    int arr_len = env->GetArrayLength(byte_frame);

    //2. 释放java数组内存
    env->ReleaseByteArrayElements(byte_frame, c_array, 0);

    //3. 具体处理
    for(int i=0 ; i< arr_len;i++)
    {
        c_array[i] = c_array[i] + 1;
        LOGI("123");

//        __android_log_print()
    }

    //4. 组装返回数据
    jbyteArray jbyteArray1 = env->NewByteArray(arr_len);
    env->SetByteArrayRegion(jbyteArray1, 0, arr_len, c_array);

    return jbyteArray1;
}

参考《FFmpeg一键编译Android arm64位和32位共享库（armeabi-v7a arm64-v8a）》

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FFmpeg ndk交叉编译， 集成到android

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