8.RV1126-OPENCV 视频中添加LOGO - 指南

一.视频中添加 LOGO 图像大体流程

        首先初始化VI,VENC模块并使能，然后创建两个线程：1.把LOGO灰度化，然后获取VI原始数据，其次把VI数据Mat化并创建一个感兴趣区域，最终把LOGO放感兴趣区域里并把数据发送给VENC。2.专门获取VENC数据，并存储素材到文件里。

二.代码具体实现

// Copyright 2020 Fuzhou Rockchip Electronics Co., Ltd. All rights reserved.// Use of this source code is governed by a BSD-style license that can be// found in the LICENSE file. #include //#include #include #include #include #include #include #include #include #include #include #include  // #include "common/sample_common.h"#include "rkmedia_api.h" #include // #include #include #include  using namespace cv;using namespace std;  #define CAMERA_PATH "rkispp_scale0"#define CAMERA_ID 0#define CAMERA_CHN 0#define VENC_CHN 0#define WIDTH 1920#define HEIGHT 1080 //opencv的Logo处理VI线程void *opencv_vi_logo_handle_thread(void *args){  pthread_detach(pthread_self());   MEDIA_BUFFER mb = NULL;  Mat logo_img = imread("zjl.jpg");//读取LOGO图片编码Mat矩阵  cvtColor(logo_img, logo_img, COLOR_RGB2GRAY); //cvtColor把彩色图像转换成灰度图   while (1)  {    mb = RK_MPI_SYS_GetMediaBuffer(RK_ID_VI, CAMERA_CHN, -1);//获取VI模块的数据    if (!mb)    {      printf("Get vi break....\n");      break;    }     printf("Get vi success...\n");     Mat rv1126_img_mat = Mat(HEIGHT, WIDTH, CV_8UC1, RK_MPI_MB_GetPtr(mb));//把VI数据转换成Mat矩阵    Mat rv1126_img_mat_roi = rv1126_img_mat(Rect(100, 100, logo_img.cols, logo_img.rows));//在Mat矩阵里面获取感兴趣区域    logo_img.copyTo(rv1126_img_mat_roi);//把Logo的矩阵拷贝到可感兴趣区域    RK_MPI_SYS_SendMediaBuffer(RK_ID_VENC, VENC_CHN, mb);//把处理后的VI数据传输给VENC编码器    RK_MPI_MB_ReleaseBuffer(mb);//释放资源  }   return NULL;}  //专门获取上面处理好的数据并保存到文件里void *get_venc_stream_thread(void *args){  pthread_detach(pthread_self());  MEDIA_BUFFER mb = NULL;  FILE * h264_opencv_logo_file = fopen("test_opencv_logo.h264", "w+"); //   while (1)  {    mb = RK_MPI_SYS_GetMediaBuffer(RK_ID_VENC, VENC_CHN, -1);//获取VENC编码器数据    if(!mb)    {       printf("Get venc break.....\n");       break;    }     fwrite(RK_MPI_MB_GetPtr(mb), RK_MPI_MB_GetSize(mb), 1 , h264_opencv_logo_file);//保存数据    RK_MPI_MB_ReleaseBuffer(mb);//释放资源  }   return NULL;} int main(){  int ret;  VI_CHN_ATTR_S vi_chn_attr;  vi_chn_attr.pcVideoNode = CAMERA_PATH;        // Path  vi_chn_attr.u32Width = WIDTH;                 // Width  vi_chn_attr.u32Height = HEIGHT;               // Height  vi_chn_attr.enPixFmt = IMAGE_TYPE_NV12;       // ImageType  vi_chn_attr.enBufType = VI_CHN_BUF_TYPE_MMAP; // BufType  vi_chn_attr.u32BufCnt = 3;                    // Cnt  vi_chn_attr.enWorkMode = VI_WORK_MODE_NORMAL; // Mode  ret = RK_MPI_VI_SetChnAttr(CAMERA_ID, CAMERA_CHN, &vi_chn_attr);  if (ret)  {    printf("Vi Set Attr Failed.....\n");    return 0;  }  else  {    printf("Vi Set Attr Success.....\n");  }   ret = RK_MPI_VI_EnableChn(CAMERA_ID, CAMERA_CHN);  if (ret)  {    printf("Vi Enable Attr Failed.....\n");    return 0;  }  else  {    printf("Vi Enable Attr Success.....\n");  }   VENC_CHN_ATTR_S venc_chn_attr;  memset(&venc_chn_attr, 0, sizeof(VENC_CHN_ATTR_S));  venc_chn_attr.stVencAttr.u32PicWidth = WIDTH;  venc_chn_attr.stVencAttr.u32PicHeight = HEIGHT;  venc_chn_attr.stVencAttr.u32VirWidth = WIDTH;  venc_chn_attr.stVencAttr.u32VirHeight = HEIGHT;  venc_chn_attr.stVencAttr.imageType = IMAGE_TYPE_NV12;  venc_chn_attr.stVencAttr.enType = RK_CODEC_TYPE_H264;  venc_chn_attr.stVencAttr.u32Profile = 66;  venc_chn_attr.stRcAttr.enRcMode = VENC_RC_MODE_H264CBR;  venc_chn_attr.stRcAttr.stH264Cbr.u32Gop = 25;  venc_chn_attr.stRcAttr.stH264Cbr.u32BitRate = WIDTH * HEIGHT * 3;  venc_chn_attr.stRcAttr.stH264Cbr.fr32DstFrameRateDen = 1;  venc_chn_attr.stRcAttr.stH264Cbr.fr32DstFrameRateNum = 25;  venc_chn_attr.stRcAttr.stH264Cbr.u32SrcFrameRateDen = 1;  venc_chn_attr.stRcAttr.stH264Cbr.u32SrcFrameRateNum = 25;  ret = RK_MPI_VENC_CreateChn(VENC_CHN, &venc_chn_attr);    if (ret)  {    printf("ERROR: Create venc failed!\n");    exit(0);  }   ret = RK_MPI_VI_StartStream(CAMERA_ID, CAMERA_CHN);  if (ret)  {    printf("start vi failed....\n");  }  else  {    printf("start vi success....\n");  }   pthread_t pid1, pid2;  pthread_create(&pid1, NULL, opencv_vi_logo_handle_thread, NULL);  pthread_create(&pid2, NULL, get_venc_stream_thread, NULL);   while (1)  {    sleep(2);  }   RK_MPI_VENC_DestroyChn(VENC_CHN);  RK_MPI_VI_DisableChn(CAMERA_ID, CAMERA_CHN);   return 0;}

 三.效果图