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，最后把LOGO放感兴趣区域里并把数据发送给VENC。2.专门获取VENC数据，并存储数据到文件里。
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 <assert.h>
//#include <bits/types/FILE.h>
#include <fcntl.h>
#include <getopt.h>
#include <opencv2/imgproc.hpp>
#include <pthread.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>// #include "common/sample_common.h"
#include "rkmedia_api.h"#include <opencv2/core.hpp>
// #include <opencv2/imgoroc.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/opencv.hpp>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; // Pathvi_chn_attr.u32Width = WIDTH; // Widthvi_chn_attr.u32Height = HEIGHT; // Heightvi_chn_attr.enPixFmt = IMAGE_TYPE_NV12; // ImageTypevi_chn_attr.enBufType = VI_CHN_BUF_TYPE_MMAP; // BufTypevi_chn_attr.u32BufCnt = 3; // Cntvi_chn_attr.enWorkMode = VI_WORK_MODE_NORMAL; // Moderet = 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
