APPRO IPNC RDK更换监控画面上TI Logo标志

Application/src/ipnc_rdk/av_capture/application/ipnc/av_server/src/fonts目录下

ascii_TI_Logo_160_64.c
ascii_TI_Logo_80_32.c

两文件中分别有两个数组用于存放TI LOGO图片的Y 和 UV分量,通过下面的代码,可将其中的数据保存为24位的bmp图像

int save_logo_ti_160_64_bmp24(){AVFormatContext *fmtCtx = NULL;FILE *fp = NULL;struct SwsContext *pSwsCtx=NULL;int width=160,height=64;pSwsCtx = sws_getContext(width,height,PIX_FMT_YUV420P,width,height,PIX_FMT_BGR24,SWS_BILINEAR,NULL,NULL,NULL);fp = fopen("out.bmp", "wb");if(pSwsCtx){int pitch = width/2;uint8_t * U=malloc(sizeof(TILogo_UV_160_64)/2),*V=malloc(sizeof(TILogo_UV_160_64)/2);uint8_t *data[4]={TILogo_Y_160_64,U,V,NULL};int linesize[4]={width,pitch,pitch,0};int i=0,ii=0,iii=0;uint8_t * buffer = NULL;AVFrame * rgb_frame = avcodec_alloc_frame();//memset(U,0x80,sizeof(TILogo_UV_160_64)/2);//memset(V,0x80,sizeof(TILogo_UV_160_64)/2);//TILogo_UV_160_64数组交替存储UV,序列为UVUVUVUVUVUVfor(i=0;i<sizeof(TILogo_UV_160_64);i++){if(i%2){V[ii++]=TILogo_UV_160_64[i];}else{U[iii++]=TILogo_UV_160_64[i];}}buffer = (unsigned char *)av_malloc(avpicture_get_size(PIX_FMT_BGR24,width,height));avpicture_fill((AVPicture*)rgb_frame,(uint8_t *)buffer,PIX_FMT_BGR24,width,height);sws_scale(pSwsCtx,data,linesize,0,height,rgb_frame ->data,rgb_frame ->linesize);save_bmp(rgb_frame ->data[0],rgb_frame ->linesize[0]*height,width,height,fp);av_free(rgb_frame);av_free(buffer);free(U);free(V);}fclose(fp);return 0;}

其中save_bmp函数的定义可参阅我的blog《ffmpeg Windows下采集摄像头一帧数据，并保存为bmp图片》。

根据该原理,分别设计2个160x64和80x32的24位的bmp图像(注意,设计好图片后将其进行垂直翻转,否则,通过下面的函数转换出来的图片是反的),

使用下面的函数将bmp图片的bgr24数据转化为yuv420p数据.

int conv_bgr24_to_yuv420p(const char * src_bmp24_file,const char * dst_yuv420p_data_file){AVFormatContext *fmtCtx = NULL;FILE *fp = NULL;struct SwsContext *pSwsCtx=NULL;uint8_t * bmp_data = NULL;int data_size = 0;int w=0,h=0;fp = fopen(src_bmp24_file, "rb");//打开图片文件if(fp){//位图文件头BITMAPFILEHEADER bmpheader={0}; BITMAPINFO bmpinfo={0}; fread(&bmpheader,sizeof(BITMAPFILEHEADER),1,fp);fread(&bmpinfo.bmiHeader,sizeof(BITMAPINFOHEADER),1,fp);w = bmpinfo.bmiHeader.biWidth;h = bmpinfo.bmiHeader.biHeight;data_size = bmpheader.bfSize - bmpheader.bfOffBits;if(data_size != w * h * 3){printf("not 24 bit bmp\n");fclose(fp);return -1;}bmp_data = (uint8_t *)malloc(data_size);memset(bmp_data,0,data_size);if(bmp_data){fread(bmp_data,data_size,1,fp);}fclose(fp);fp = NULL;}if(bmp_data){pSwsCtx = sws_getContext(w,h,PIX_FMT_BGR24,w,h,PIX_FMT_YUV420P,SWS_POINT/*SWS_BILINEAR*/,NULL,NULL,NULL);if(pSwsCtx){uint8_t *data[4]={bmp_data,NULL,NULL,NULL};int linesize[4]={w*3,0,0,0};int height= 0;uint8_t * buffer= NULL;AVFrame * yuv_frame = avcodec_alloc_frame();buffer = (unsigned char *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P,w,h));memset(buffer,0,avpicture_get_size(PIX_FMT_YUV420P,w,h));avpicture_fill((AVPicture*)yuv_frame,(uint8_t *)buffer,PIX_FMT_YUV420P,w,h);height = sws_scale(pSwsCtx,data,linesize,0,h,yuv_frame ->data,yuv_frame ->linesize);fp = fopen(dst_yuv420p_data_file,"w");if(fp){char buf[1024]={0};int i=0;sprintf(buf,"/*********************Y***************************/\nunsigned char logo_Y[]={");fwrite(buf,1,strlen(buf),fp);for(i=0;i<yuv_frame ->linesize[0]*height;i++){if(!(i%16)){sprintf(buf,"\n\t");fwrite(buf,strlen(buf),1,fp);}if(i){sprintf(buf,",0x%02X",*(yuv_frame ->data[0]+i));}else{sprintf(buf," 0x%02X",*(yuv_frame ->data[0]+i));}fwrite(buf,strlen(buf),1,fp);}sprintf(buf,"\n};\n//%d bytes\n/**************end of Y***************************/\n\n",yuv_frame ->linesize[0]*h);fwrite(buf,strlen(buf),1,fp);sprintf(buf,"/********************UV***************************/\nunsigned char logo_UV[]={");fwrite(buf,1,strlen(buf),fp);for(i=0;i<yuv_frame ->linesize[1]*height/2;i++){if(!(i%8)){sprintf(buf,"\n\t");fwrite(buf,strlen(buf),1,fp);}if(i){sprintf(buf,",0x%02X,0x%02X",*(yuv_frame ->data[1]+i),*(yuv_frame ->data[2]+i));}else{sprintf(buf," 0x%02X,0x%02X",*(yuv_frame ->data[1]+i),*(yuv_frame ->data[2]+i));}fwrite(buf,strlen(buf),1,fp);}sprintf(buf,"\n};\n//%d bytes\n/*************end of UV***************************/\n\n",yuv_frame ->linesize[1]*h);fwrite(buf,strlen(buf),1,fp);fclose(fp);fp = NULL;}av_free(yuv_frame);av_free(buffer);sws_freeContext(pSwsCtx);pSwsCtx = NULL;}free(bmp_data);bmp_data = NULL;}return 0;}

转换完成后,将dst_yuv420p_data_file文件中的logo_Y数组和logo_UV数组中的数据替换ascii_TI_Logo_160_64.c 和ascii_TI_Logo_80_32.c中Y和UV数组，重新编译av_server即可。