This article mainly talks about the VENC code in Hisilicon Sample to introduce his experience.

/******************************************************************************
* function    : main()
* Description : video venc sample
******************************************************************************/
#ifdef __HuaweiLite__
    int app_main(int argc, char *argv[])
#else
    int main(int argc, char *argv[])
#endif
{
    HI_S32 s32Ret;
    HI_U32 u32Index;

    if (argc < 2 || argc > 2)
    {
        SAMPLE_VENC_Usage(argv[0]);
        return HI_FAILURE;
    }

    if (!strncmp(argv[1], "-h", 2))
    {
        SAMPLE_VENC_Usage(argv[0]);
        return HI_SUCCESS;
    }

    u32Index = atoi(argv[1]);

#ifndef __HuaweiLite__
    signal(SIGINT, SAMPLE_VENC_HandleSig);
    signal(SIGTERM, SAMPLE_VENC_HandleSig);
#endif

    switch (u32Index)
    {
        case 0:
            s32Ret = SAMPLE_VENC_H265_H264();
            break;
        case 1:
            s32Ret = SAMPLE_VENC_LOW_DELAY();
            break;
        case 2:
            s32Ret = SAMPLE_VENC_Qpmap();
            break;
        case 3:
            s32Ret = SAMPLE_VENC_IntraRefresh();
            break;
        case 4:
            s32Ret = SAMPLE_VENC_ROIBG();
            break;
        case 5:
            s32Ret = SAMPLE_VENC_DeBreathEffect();
            break;
        case 6:
            s32Ret = SAMPLE_VENC_SVC_H264();
            break;
        case 7:
            s32Ret = SAMPLE_VENC_MJPEG_JPEG();
            break;
        default:
            printf("the index is invaild!\n");
            SAMPLE_VENC_Usage(argv[0]);
            return HI_FAILURE;
    }

    if (HI_SUCCESS == s32Ret)
    { printf("program exit normally!\n"); }
    else
    { printf("program exit abnormally!\n"); }

#ifdef __HuaweiLite__
    return s32Ret;
#else
    exit(s32Ret);
#endif
}

#ifdef __cplusplus
#if __cplusplus
}
#endif
#endif /* End of #ifdef __cplusplus */

SAMPLE_VENC’s main function has seven encoding functions. Take the first SAMPLE_VENC_H265_H264 () as an example to introduce the process of Venc.

Main 
     SAMPLE_VENC_USAGE (/*SAMPLE usage*/) 
     Switch (U32Index) 
         Sample_venc_h265_h264 () // encoding H264, 265 
             Sample_comm_sys_getpicSize () // 
             Sample_comm_vi_getsensorinfo () // 
             Sample_venc_checksensor () 
             Sample_venc_modifyResolution () // if hifailure run this 
                 Sample_comm_vi_GetsizeBySor () // get entises by different sensor 
                 Sample_comm_sys_getpicSize () // Get Piction Size (w*h), accounting enpicSize 
             Sample_venc_vi_init () 
                 Sample_venc_sys_init () 
                     MEMSET (& Stvbconf, 0, SIZEOF (VB_CONFIG_S)) // Clear in the cache pool memory clearing 0 
                     SAMPLE_COMM_VI_GETSIZESOR () // Obtain image data from the Sensor type 1080p, 720p and the like 
                     Sample_comm_sys_getpicSize () // From 1080p, 720p gets the width and high of the image 
                     Common_getpicbuffersize () // Calculate the size of the cache block 
                     if (0 == U32SupplementConfig) 
                         Sample_comm_sys_init () 
                             Hi_mpi_sys_exit () // Go to initialize 
                             Hi_mpi_vb_exit (); // vb to initialize 
                             Hi_mpi_vb_setconfig () // vb set 
                             Hi_mpi_vb_init (); // vb init 
                             Hi_mpi_sys_init (); // MPP Init 
                         Sample_comm_sys_initwithvbsupplement () 
                             Hi_mpi_sys_exit () // Go to initialize 
                             Hi_mpi_vb_exit (); // vb to initialize 
                             Hi_mpi_vb_setconfig () 
                             Hi_mpi_vb_setSupplementconfig () // Set the additional information of VB memory 
                             Hi_mpi_vb_init () 
                             Hi_mpi_sys_init (); 
             Sample_venc_vpsS_init () 
                 SAMPLE_COMM_VI_GETSIZESOR () // Obtain image data from the Sensor type 1080p, 720p and the like 
                 Sample_comm_sys_getpicSize () // From 1080p, 720p gets the width and high of the image 
                 Sample_comm_vpsS_Start () // 
                     Hi_mpi_vpsm_creategrp () 
                     Hi_mpi_vpsS_Setchnattr () 
                     Hi_mpi_vpsS_Startgrp () 
             Sample_comm_vi_bind_vpsS () // directly call, Hisilicon Good 
                 Hi_mpi_sys_bind () 

             // Start Stream Venc 
             Sample_venc_getrcmode () // get cbr etc 
             Sample_venc_getgopmode () // get normalp etc 
             Sample_comm_venc_getgopattr () // Configure Gop if failure goto exit_vi_vpsS_UNBind 

             /*** encode h.265 **/ 
             Sample_comm_venc_start () // if failure goto exit_vi_vpsS_unbind 
                 Sample_comm_venc_creat () 
                     Sample_comm_sys_getpicSize () 
                     Sample_comm_vi_getsensorinfo () // Get Sensor data, configure CHN, DEV, etc. 
                     Sample_comm_vi_getframerateBYSOR () // Get Information From Sensor and Control Framerate 
                     Hi_mpi_venc_createchn () 
                     Sample_comm_venc_closreencode () 
             Sample_comm_vps_bind_venc () // if failure get_venc_h265_stop 

             /*** encode h.264 **/ 
             Sample_comm_venc_start () // if failure goto exit_vi_vpsS_unbind 
             Sample_comm_vps_bind_venc () // if failure get_venc_h264_stop 

             // stream save process 
             Sample_comm_venc_startgetstream () 
                 pthread_create (& gs_vencpid, 0, sample_comm_venc_getvencstreamproc, (hi_void*) & gs_stpara); // Create a thread 
                    Sample_comm_venc_getvencstreamproc () // This Has 5 Steps and If Failure Goto EXIT_VENC_H264_UNBID 

                 Sample_comm_venc_stopgetStream () // EXIT 
             Exit_venc_h264_unbind: 
                 Sample_comm_vpsS_UNBIND_VENC (VPSSGRP, VPSSCHN [1], Vencchn [1]); 
             Exit_venc_h264_stop: 
                 Sample_comm_venc_stop (vencchn [1]); 
             Exit_venc_h265_unbind: 
                 Sample_comm_vpsS_UNBIND_VENC (VPSSGRP, VPSSCHN [0], Vencchn [0]); 
             Exit_venc_h265_stop: 
                 Sample_comm_venc_stop (vencchn [0]); 
             EXIT_VI_VPSS_UNBID: 
                 Sample_comm_vi_unbind_vpsS (vipipe, vichn, vpsgrp); 
             Exit_vpsS_Stop: 
                 Sample_comm_vpsS_Stop (VPSSGRP, Abchnenable); 
             Exit_vi_stop: 
                 Sample_comm_vi_stopvi (& sTViconfig); 
                 Sample_comm_sys_exit (); 

         Sample_venc_low_delay () // 
         Sample_venc_qpmap () 
         Sample_venc_intrairefresh () 
         Sample_venc_roibg () 
         Sample_venc_debreatheffect () 
         Sample_venc_svc_h264 () 
         Sample_venc_mjpeg_jpeg () 
         Sample_venc_usage () 

 The picture above

is the diagram of my graphics of SAMPLE_VENC_H265_H264 (), and the represented sub -function is called by the previous level, and a small number of comments are attached.

/******************************************************************************
* function: H.265e + [email protected], H.265 Channel resolution adaptable with sensor
******************************************************************************/
HI_S32 SAMPLE_VENC_H265_H264(void)
{
    HI_S32 i;
    HI_S32 s32Ret;
    SIZE_S          stSize[2];
    PIC_SIZE_E      enSize[2]     = {PIC_3840x2160, PIC_720P};
    HI_S32          s32ChnNum     = 2;
    VENC_CHN        VencChn[2]    = {0,1};
    HI_U32          u32Profile[2] = {0,0};
    PAYLOAD_TYPE_E  enPayLoad[2]  = {PT_H265, PT_H264};
    VENC_GOP_MODE_E enGopMode;
    VENC_GOP_ATTR_S stGopAttr;
    SAMPLE_RC_E     enRcMode;
    HI_BOOL         bRcnRefShareBuf = HI_TRUE;

    VI_DEV          ViDev        = 0;
    VI_PIPE         ViPipe       = 0;
    VI_CHN          ViChn        = 0;
    SAMPLE_VI_CONFIG_S stViConfig;

    VPSS_GRP        VpssGrp        = 0;
    VPSS_CHN        VpssChn[2]     = {0,1};
    HI_BOOL         abChnEnable[VPSS_MAX_PHY_CHN_NUM] = {1,1,0};

    HI_U32 u32SupplementConfig = HI_FALSE;

    for(i=0; i<s32ChnNum; i++)
    {
        s32Ret = SAMPLE_COMM_SYS_GetPicSize(enSize[i], &stSize[i]);
        if (HI_SUCCESS != s32Ret)
        {
            SAMPLE_PRT("SAMPLE_COMM_SYS_GetPicSize failed!\n");
            return s32Ret;
        }
    }

    SAMPLE_COMM_VI_GetSensorInfo(&stViConfig);
    if(SAMPLE_SNS_TYPE_BUTT == stViConfig.astViInfo[0].stSnsInfo.enSnsType)
    {
        SAMPLE_PRT("Not set SENSOR%d_TYPE !\n",0);
        return HI_FAILURE;
    }

    s32Ret = SAMPLE_VENC_CheckSensor(stViConfig.astViInfo[0].stSnsInfo.enSnsType,stSize[0]);
    if(s32Ret != HI_SUCCESS)
    {
        s32Ret = SAMPLE_VENC_ModifyResolution(stViConfig.astViInfo[0].stSnsInfo.enSnsType,&enSize[0],&stSize[0]);
        if(s32Ret != HI_SUCCESS)
        {
            return HI_FAILURE;
        }
    }

    stViConfig.s32WorkingViNum       = 1;
    stViConfig.astViInfo[0].stDevInfo.ViDev     = ViDev;
    stViConfig.astViInfo[0].stPipeInfo.aPipe[0] = ViPipe;
    stViConfig.astViInfo[0].stChnInfo.ViChn     = ViChn;
    stViConfig.astViInfo[0].stChnInfo.enDynamicRange = DYNAMIC_RANGE_SDR8;
    stViConfig.astViInfo[0].stChnInfo.enPixFormat    = PIXEL_FORMAT_YVU_SEMIPLANAR_420;

    s32Ret = SAMPLE_VENC_VI_Init(&stViConfig, HI_FALSE,u32SupplementConfig);
    if(s32Ret != HI_SUCCESS)
    {
        SAMPLE_PRT("Init VI err for %#x!\n", s32Ret);
        return HI_FAILURE;
    }

    s32Ret = SAMPLE_VENC_VPSS_Init(VpssGrp,abChnEnable,DYNAMIC_RANGE_SDR8,PIXEL_FORMAT_YVU_SEMIPLANAR_420,stSize,stViConfig.astViInfo[0].stSnsInfo.enSnsType);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Init VPSS err for %#x!\n", s32Ret);
        goto EXIT_VI_STOP;
    }

    s32Ret = SAMPLE_COMM_VI_Bind_VPSS(ViPipe, ViChn, VpssGrp);
    if(s32Ret != HI_SUCCESS)
    {
        SAMPLE_PRT("VI Bind VPSS err for %#x!\n", s32Ret);
        goto EXIT_VPSS_STOP;
    }

   /******************************************
    start stream venc
    ******************************************/

    enRcMode = SAMPLE_VENC_GetRcMode();

    enGopMode = SAMPLE_VENC_GetGopMode();
    s32Ret = SAMPLE_COMM_VENC_GetGopAttr(enGopMode,&stGopAttr);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Venc Get GopAttr for %#x!\n", s32Ret);
        goto EXIT_VI_VPSS_UNBIND;
    }

   /***encode h.265 **/
    s32Ret = SAMPLE_COMM_VENC_Start(VencChn[0], enPayLoad[0],enSize[0], enRcMode,u32Profile[0],bRcnRefShareBuf,&stGopAttr);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Venc Start failed for %#x!\n", s32Ret);
        goto EXIT_VI_VPSS_UNBIND;
    }

    s32Ret = SAMPLE_COMM_VPSS_Bind_VENC(VpssGrp, VpssChn[0],VencChn[0]);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Venc Get GopAttr failed for %#x!\n", s32Ret);
        goto EXIT_VENC_H265_STOP;
    }

    /***encode h.264 **/
    s32Ret = SAMPLE_COMM_VENC_Start(VencChn[1], enPayLoad[1], enSize[1], enRcMode,u32Profile[1],bRcnRefShareBuf,&stGopAttr);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Venc Start failed for %#x!\n", s32Ret);
        goto EXIT_VENC_H265_UnBind;
    }

    s32Ret = SAMPLE_COMM_VPSS_Bind_VENC(VpssGrp, VpssChn[1],VencChn[1]);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Venc bind Vpss failed for %#x!\n", s32Ret);
        goto EXIT_VENC_H264_STOP;
    }

    /******************************************
     stream save process
    ******************************************/
    s32Ret = SAMPLE_COMM_VENC_StartGetStream(VencChn,s32ChnNum);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Start Venc failed!\n");
        goto EXIT_VENC_H264_UnBind;
    }

    printf("please press twice ENTER to exit this sample\n");
    getchar();
    getchar();

    /******************************************
     exit process
    ******************************************/
    SAMPLE_COMM_VENC_StopGetStream();

EXIT_VENC_H264_UnBind:
    SAMPLE_COMM_VPSS_UnBind_VENC(VpssGrp,VpssChn[1],VencChn[1]);
EXIT_VENC_H264_STOP:
    SAMPLE_COMM_VENC_Stop(VencChn[1]);
EXIT_VENC_H265_UnBind:
    SAMPLE_COMM_VPSS_UnBind_VENC(VpssGrp,VpssChn[0],VencChn[0]);
EXIT_VENC_H265_STOP:
    SAMPLE_COMM_VENC_Stop(VencChn[0]);
EXIT_VI_VPSS_UNBIND:
    SAMPLE_COMM_VI_UnBind_VPSS(ViPipe,ViChn,VpssGrp);
EXIT_VPSS_STOP:
    SAMPLE_COMM_VPSS_Stop(VpssGrp,abChnEnable);
EXIT_VI_STOP:
    SAMPLE_COMM_VI_StopVi(&stViConfig);
    SAMPLE_COMM_SYS_Exit();

    return s32Ret;
}

I wanted to write a detailed explanation, but too much, I don’t want to do it anymore.

is a bit strange. If I inserted the SD card, SAMPLE_VENC failed to run, and reBoot was not working. I need to re -call. I used mount and umount commands when I inserted. Essence

Next to see how the audio is tidy, get a program to record the audio and video for a period of time, and share it with everyone.