使用Android studio移植FFmpeg3.3进行转码

来源：互联网发布：金融大数据就业前景编辑：程序博客网时间：2024/06/05 00:59

注意以下操作必须使用Android studio2.2以上

第一步：导入so文件

1、在main目录下新建jniLibs目录

2、再在jniLibs下新建armeabi目录

3、将编译好的so文件拷贝到armeabi目录下

4、将编译生成的include目录拷贝到jniLibs目录下（参考：编译FFmpeg）

第二步：配置CMakeLists

cmake_minimum_required(VERSION 3.4.1)add_library( native-lib             SHARED             src/main/cpp/native-lib.cpp             src/main/cpp/test_ffmpeg.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(native-lib                      avcodec-57                      avfilter-6                      avformat-57                      avutil-55                      swresample-2                      swscale-4                      ${log-lib}                      ${android-lib})

第三步：配置build.gradle

defaultConfig {...        externalNativeBuild {            cmake {                cppFlags "-std=c++11 -frtti -fexceptions"            }        }        ndk {            //这里我们只有armeabi就只配置这个就行了            abiFilters  'armeabi'        }    }    sourceSets.main {        jniLibs.srcDirs = ['src/main/jniLibs']    }        externalNativeBuild {        cmake {            path "CMakeLists.txt"        }    }

第四步：编写native方法

package com.zzq.mack.ffmpeg.natives;/** * Created by mack on 2017/4/28. */public class PlayerNative {    /**     * 音视频解码播放     * @param path     * @param view     */    public native static void paly(String path,Object view);}

生成头文件参考http://blog.csdn.net/quan648997767/article/details/64923143

第五步：编写c/c++代码

#include <jni.h>#include <com_zzq_mack_ffmpeg_PlayerNative.h>#include <android/native_window.h>#include <android/native_window_jni.h>#include <unistd.h>#include <android/log.h>#define LOGI(FORMAT,...) __android_log_print(ANDROID_LOG_INFO,"TAG",FORMAT,##__VA_ARGS__);#define LOGE(FORMAT,...) __android_log_print(ANDROID_LOG_ERROR,"TAG",FORMAT,##__VA_ARGS__);extern "C" {#include "libavformat/avformat.h"#include "libswscale/swscale.h"#include <libavfilter/avfiltergraph.h>#include "libavfilter/avfilter.h"#include "libavutil/imgutils.h"#include "libavutil/avutil.h"#include "libavfilter/buffersink.h"#include "libavfilter/buffersrc.h"#include "libavcodec/avcodec.h"}/** * * 音视频解码  */JNIEXPORT void JNICALLJava_com_zzq_mack_ffmpeg_natives_PlayerNative_paly(JNIEnv *env, jclass type, jstring path_, jobject view) {    const char *path = env->GetStringUTFChars(path_, 0);    //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,path,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_, path);    LOGI("解析完成");}

第六步：JAVA层调用

public void mPaly(View view){        final String path = "/storage/emulated/0/pp/service/video/test1.flv";//1493695201802.mp4";//        final VideoView mVideo = (VideoView) findViewById(R.id.video);        if (new File(path).exists()){            runOnUiThread(new Runnable() {                @Override                public void run() {                    PlayerNative.paly(path,mVideo.getHolder().getSurface());                    //PlayerNative.voideCoding(path);                }            });        }else{            System.out.println("文件不存在");        }    }

VideoView是一个自己重写的SurfaceView代码如下：

package com.zzq.mack.ffmpeg;import android.content.Context;import android.graphics.PixelFormat;import android.util.AttributeSet;import android.view.SurfaceHolder;import android.view.SurfaceView;/** * Created by mack on 2017/4/28. */public class VideoView extends SurfaceView {    public VideoView(Context context) {        super(context);        init();    }    public VideoView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public VideoView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        SurfaceHolder holder = getHolder();        holder.setFormat(PixelFormat.RGBA_8888);    }}

布局文件也给出来吧：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:background="@android:color/white">    <Button        android:id="@+id/btn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="开始"        android:onClick="mPaly"/>    <com.zzq.mack.ffmpeg.VideoView        android:id="@+id/video"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

最后加上权限就可以跑了：

  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

后续会更新最新有FFmpeg其他有趣的东西。。。

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