Android NDK在Mac OS 上面编译FFmpeg时遇见的坑？

第一步：下载NDK

第二步：下载FFmpeg的源码，git clone https://github.com/FFmpeg/FFmpeg.git

第三步：编写shell脚本，编译FFmpeg成.so库

#!/bin/bash

echo "$ANDROID_NDK"

NDK=${ANDROID_NDK}
#NDK=/Users/ianchang/Public/Android/android-ndk-r14b
NDK_VERSION=android-19

echo "NDK=$NDK NDK_VERSION=$NDK_VERSION"

# darwin linux
function build_one {
./configure \
--target-os=linux \
--arch=$ARCH \
--prefix=$PREFIX \
--enable-shared \
--disable-static \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-doc \
--disable-symver \
--enable-cross-compile \
--cross-prefix=$CROSS_COMPILE \
--sysroot=$SYSROOT \
--extra-cflags="-fpic"

$ADDITIONAL_CONFIGURE_FLAG

make clean
make -j8
make install
}

ARCH=arm
CPU=arm
PREFIX=$(pwd)/android/$CPU
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/arm-linux-androideabi-
SYSROOT=$NDK/platforms/$NDK_VERSION/arch-$ARCH

echo "PREFIX=${PREFIX}"
echo "TOOLCHAIN=${TOOLCHAIN}"
echo "CROSS_COMPILE=${CROSS_COMPILE}"
echo "SYSROOT=${SYSROOT}"

echo "******************************" 
build_android

1、修改configure文件，替换以下几个字段的值：

#SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
#LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
#SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
#SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'

2、运行shell脚本，开始进行编译。建议最好不要下载最新的版本，因为最新的版本在NDK交叉编译时，会报各有文件找

不到的错误。

 注意：进入到ffmpeg（cd ffmpeg-3.3.6/） 所在的目录下面，运行 ./build_android.sh。如果无法执行脚本，可能是没有权限，可以使用下面命令

chmod 755 ./build_android.sh 

 3、运行完成的结果，如下图：

4、编译完成，所生成的so库，如下图：

第四步：导入项目中，使用Android Studio 并运行项目

1、创建一个工程，使用Android Studio，在创建时记得勾选上

2、配置gradle文件，如下：

externalNativeBuild {
      cmake {
        cppFlags "-std=c++11 -frtti -fexceptions"
        arguments "-DANDROID_STL=c++_shared"
   }
}     

   
ndk {
   //这里我们只有armeabi就只配置这个就行了
//            abiFilters 'x86', 'armeabi', 'armeabi-v7a', 'x86_64', 'arm64-v8a'
  abiFilters 'armeabi'
}

sourceSets.main {
    jniLibs.srcDirs = ['src/main/jniLibs']
}

3、编辑 CMakeLists.txt 文件：

#CMake版本信息
cmake_minimum_required(VERSION 3.4.1)

#支持-std=gnu++11
set(CMAKE_VERBOSE_MAKEFILE on)

message("--I print it:----------->>>>>>>'${CMAKE_CXX_FLAGS}'")

project( libFFmpeg )

message("Checking CMAKE_SYSTEM_NAME = '${CMAKE_SYSTEM_NAME}'")
if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
  add_definitions(-DOS_OSX)
elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
  add_definitions(-DOS_LINUX)
elseif (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
  add_definitions(-DOS_WIN)
elseif (${CMAKE_SYSTEM_NAME} MATCHES "Android")
  add_definitions(-DOS_ANDROID)
  message("Checking CMAKE_ABI_NAME = '${CMAKE_ANDROID_ARCH_ABI}'")
else()
  message("OS not detected.")
endif()

### 配置资源目录
add_library( MyFFmpeg
             SHARED
             src/main/cpp/native-lib.cpp )

find_library( log-lib
              log )


find_library( android-lib
              android )

set(distribution_DIR ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

add_library( avutil-55
             SHARED
             IMPORTED )
set_target_properties( avutil-55
                       PROPERTIES IMPORTED_LOCATION
                       ${distribution_DIR}/libavutil-55.so)

add_library( swresample-2
             SHARED
             IMPORTED )
set_target_properties( swresample-2
                       PROPERTIES IMPORTED_LOCATION
                       ${distribution_DIR}/libswresample-2.so)

add_library( avfilter-6
             SHARED
             IMPORTED )
set_target_properties( avfilter-6
                       PROPERTIES IMPORTED_LOCATION
                       ${distribution_DIR}/libavfilter-6.so)

add_library( avformat-57
             SHARED
             IMPORTED )
set_target_properties( avformat-57
                       PROPERTIES IMPORTED_LOCATION
                       ${distribution_DIR}/libavformat-57.so)

add_library( swscale-4
             SHARED
             IMPORTED )
set_target_properties( swscale-4
                       PROPERTIES IMPORTED_LOCATION
                       ${distribution_DIR}/libswscale-4.so)


add_library( avcodec-57
             SHARED
             IMPORTED )
set_target_properties( avcodec-57
                       PROPERTIES IMPORTED_LOCATION
                       ${distribution_DIR}/libavcodec-57.so)

set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
include_directories(src/main/cpp)
include_directories(src/main/jniLibs/include)

target_link_libraries(MyFFmpeg
                      avcodec-57
                      avfilter-6
                      avformat-57
                      avutil-55
                      swresample-2
                      swscale-4
                      ${log-lib}
                      ${android-lib})
     

4、加载自己编译的so库，不要加lib和.so等前后辍：

6、编译写cpp文件：

#include "FFmpegHeader.h"

using namespace std;

/*
 * Class:     com_function_ianchang_libffmpeg_FFmpegUtils
 * Method:    testFFmpeg
 * Signature: (Ljava/lang/String;)Ljava/lang/String;
 */
extern "C"
JNIEXPORT jstring JNICALL
Java_com_function_ianchang_libffmpeg_FFmpegUtils_testFFmpeg
        (JNIEnv *env, jclass, jstring){
    std::string hello = "Hello from C++";
    return env->NewStringUTF(hello.c_str());
}

extern "C"
JNIEXPORT void JNICALL
        METHOD_NAME(paly)(JNIEnv *env, jclass, jstring path, jobject view){

    const char* file = env->GetStringUTFChars(path, 0);

    if(file == NULL){
        LOGD("The file is a null object.");
    }

    LOGD("file=%s", file);


    //注册所有的编解码器
    av_register_all();
//    avcodec_register_all();
    int ret;
    //封装格式上线文
    AVFormatContext *fmt_ctx = avformat_alloc_context();
    //打开输入流并读取头文件。此时编解码器还没有打开
    if(avformat_open_input(&fmt_ctx, file, NULL, NULL) < 0){
        return;
    }

    //获取信息
    if(avformat_find_stream_info(fmt_ctx, NULL) < 0){
        return;
    }

    //获取视频流的索引位置
    int video_stream_index = -1;
    for (int i = 0; i < fmt_ctx->nb_streams; i++) {
        if(fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO){
            video_stream_index = i;
            LOGE("找到视频流索引位置video_stream_index=%d",video_stream_index);
            break;
        }
    }

    if (video_stream_index == -1){
        LOGE("未找到视频流索引");
    }

    ANativeWindow* nativeWindow = ANativeWindow_fromSurface(env,view);
    if (nativeWindow == NULL) {
        LOGE("ANativeWindow_fromSurface error");
        return;
    }

    //绘制时候的缓冲区
    ANativeWindow_Buffer outBuffer;
    //获取视频流解码器

    AVCodecContext *codec_ctx = avcodec_alloc_context3(NULL);
    avcodec_parameters_to_context(codec_ctx, fmt_ctx->streams[video_stream_index]->codecpar);
    AVCodec *avCodec = avcodec_find_decoder(codec_ctx->codec_id);

    //打开解码器
    if((ret = avcodec_open2(codec_ctx,avCodec,NULL)) < 0){
        ret = -3;
        return;
    }

    //循环从文件读取一帧压缩数据
    //开始读取视频
    int y_size = codec_ctx->width * codec_ctx->height;
    AVPacket *pkt = (AVPacket *)malloc(sizeof(AVPacket));//分配一个packet
    av_new_packet(pkt,y_size);//分配packet的数据
    AVFrame *yuvFrame = av_frame_alloc();
    AVFrame *rgbFrame = av_frame_alloc();

    // 颜色转换器
    SwsContext *m_swsCtx = sws_getContext(codec_ctx->width, codec_ctx->height, codec_ctx->pix_fmt, codec_ctx->width,
                                          codec_ctx->height, AV_PIX_FMT_RGBA, SWS_BICUBIC, NULL, NULL, NULL);
    //int numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGBA, codec_ctx->width, codec_ctx->height, 1);
    //uint8_t *out_buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
    LOGE("开始解码");
    int  index = 0;

    while (1){

        if(av_read_frame(fmt_ctx,pkt) < 0){
            //这里就认为视频读完了
            break;
        }

        if(pkt->stream_index == video_stream_index) {

            //视频解码
            ret = avcodec_send_packet(codec_ctx, pkt);

            if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) {
                LOGE("avcodec_send_packet ret=%d", ret);
                av_packet_unref(pkt);
                continue;
            }

            //从解码器返回解码输出数据
            ret = avcodec_receive_frame(codec_ctx, yuvFrame);
            if (ret < 0 && ret != AVERROR_EOF) {
                LOGE("avcodec_receive_frame ret=%d", ret);
                av_packet_unref(pkt);
                continue;
            }

            //avcodec_decode_video2(codec_ctx,yuvFrame,&got_pictue,&pkt);
            sws_scale(m_swsCtx, (const uint8_t *const *) yuvFrame->data, yuvFrame->linesize, 0,
                      codec_ctx->height, rgbFrame->data, rgbFrame->linesize);

            //设置缓冲区的属性
            ANativeWindow_setBuffersGeometry(nativeWindow, codec_ctx->width, codec_ctx->height,
                                             WINDOW_FORMAT_RGBA_8888);
            ret = ANativeWindow_lock(nativeWindow, &outBuffer, NULL);
            if (ret != 0) {
                LOGE("ANativeWindow_lock error");
                return;
            }

            av_image_fill_arrays(rgbFrame->data, rgbFrame->linesize,
                                 (const uint8_t *) outBuffer.bits, AV_PIX_FMT_RGBA,
                                 codec_ctx->width, codec_ctx->height, 1);
            //fill_ANativeWindow(&outBuffer,outBuffer.bits,rgbFrame);
            //将缓冲区数据显示到surfaceView
            ret = ANativeWindow_unlockAndPost(nativeWindow);
            if (ret != 0) {
                LOGE("ANativeWindow_unlockAndPost error");
                return;
            }
            LOGE("成功显示到缓冲区%d次",++index);
        }
        av_packet_unref(pkt);
        usleep(1000*16);

//            /*
//            //UYVY
//            fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height),2,output);
//            //YUV420P
//            fwrite(pFrameYUV->data[0],(pCodecCtx->width)*(pCodecCtx->height),1,output);
//            fwrite(pFrameYUV->data[1],(pCodecCtx->width)*(pCodecCtx->height)/4,1,output);
//            fwrite(pFrameYUV->data[2],(pCodecCtx->width)*(pCodecCtx->height)/4,1,output);
    }

    //av_free(out_buffer);
    av_frame_free(&rgbFrame);
    avcodec_close(codec_ctx);
    sws_freeContext(m_swsCtx);
    avformat_close_input(&fmt_ctx);
    ANativeWindow_release(nativeWindow);
    env->ReleaseStringUTFChars(path, file);
    LOGI("解析完成");

}

7、调用方式，如下：

public void playVideo(View view){

        File resFile = new File(resVideo);

        Log.d("TAG", "playVideo->resFile = "+resFile.getPath());
        Log.d("TAG", "playVideo->resFile = "+resFile.exists());


        ffmpeg.paly(resVideo, surfaceView.getHolder().getSurface());
    }

8、运行结果

Error编译异常总结和编译血泪史：折腾了很久，还是版本太高，导致的问题

Error：在编译时，遇见的问题

折腾了很久，还是版本太高，导致的问题,建议下载3.3.6以下的版本，要不在编译时，会报各种编译异常。

./libavutil/timer.h:38:31: fatal error: linux/perf_event.h: No such file or directory

INSTALL	doc/examples/transcoding.c
INSTALL	doc/examples/README
INSTALL	doc/examples/Makefile
CC	libavdevice/alldevices.o
In file included from ./libavutil/internal.h:42:0,
                 from ./libavutil/common.h:467,
                 from ./libavutil/avutil.h:296,
                 from ./libavutil/log.h:25,
                 from libavdevice/avdevice.h:48,
                 from libavdevice/alldevices.c:23:
./libavutil/timer.h:38:31: fatal error: linux/perf_event.h: No such file or directory
 # include 
                               ^
compilation terminated.
make: *** [libavdevice/alldevices.o] Error 1