海思媒体处理平台VI视频输入模块

VI模块的概念

Vi是海思媒体处理平台的视频输入模块,负责捕获视频图像,可对其进行剪切、缩放等处理,并输出多路不同分辨率的图像数据.

VI模块的功能、作用、内部单元工作流程

硬件单元功能框图

Hi3516A/Hi3518EV200/Hi3519V200 VI硬件单元功能框图.

VI可通过ITU-R BT656/601/1120 接口或 Digital Camera接口、 MIPI Rx(含 MIPI 接口、 LVDS 接口和 HISPI 接口)接收视频数据。
Vi还可以对接收到的原始视频图像数据进行裁剪(Crop)等处理,并实现一路原始视频图像输入,输出一路视频图像功能.

我们使用的是海思样例的SENSOR类型PANASONIC_MN34220_SUBLVDS_1080P_30FPS(传感器为松下的MN34220,采用SubLVDS的信号传输技术,使用1080P的分辨率,30帧率).

MIPI和LVDS的概念：
MIPI：移动产业处理器接口（Mobile Industry Processor Interface 简称MIPI）是为移动应用处理器制定的开放标准和一个规范。
LVDS：Low Voltage Differential Signaling，是一种低压差分信号技术接口。它是为克服以TTL电平方式传输宽带高码率数据时功耗大、EMI电磁干扰大等缺点而研制的一种数字视频信号传输方式,SubLVDS则是LVDS的发展.

VI内部单元工作流程

摄像机通过镜头(lens)聚焦光线,将光信号投射到 sensor 的感光区域,sensor经过光电转换，将 Bayer 格式的原始图像送给 ISP(Image Signal Processing 图像信号处理) 经过算法处理，输出 RGB 空间域的图像给后端的视频采集单元。在这个过程中，ISP 通过运行在其上的 firmware 对 lens 和 sensor 进行相应控制，进而完成自动光圈、自动曝光、自动白平衡等功能。其中，firmware 的运转靠视频采集单元的中断驱动。

ISP控制结构:

VIU视频采集单元
VIU视频采集单元负责接收ISP传过来的视频图像,经过视频输入设备Dev0的加工,通过物理通道Chn0发送给接收者,也可通过扩展通道,进行缩放后发送出去.

视频输入设备Dev0:
Hi3516A/Hi3518EV200/Hi3519V100 芯片只有一个 VI 设备，即 Dev0。 Dev0 支持BT.656、 BT.601、 DC、 MIPI Rx（MIPI、 LVDS、 HISPI 接口）输入。 Dev0 不支持非连续 pixel clock 时序。

视频物理通道Chn0:
Hi3516A/Hi3518EV200/Hi3519V100 VI 硬件单元仅包含 1 个 VI 视频物理通道，即Chn0。不存在次通道，但支持扩展通道。

视频扩展通道ext_ChnN:
扩展通道是物理通道的扩展，主要实现缩放功能，其数据来源于物理通道，Hi3516A/Hi3518EV200/Hi3519V100 最多支持 16 个扩展通道。

参阅Api实现VI

下面程序是初始化Vi后直接绑定Vi到Venc编码的例子，没有写清理工作，已测试可以运行，可供参考.

main.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>
#include <string.h>
#include <fcntl.h>

#include "My_Head.h"

static pthread_t gs_IspPid;
static HI_S32 gs_s32SnapCnt = 0;

HI_VOID WB_VENC_HandleSig(HI_S32 signo)
{
    if(SIGINT == signo || SIGTERM == signo)
    {
        LOG_D("Interrupt Happen! exit\n");
    }
    exit(HI_FAILURE);
}

HI_S32 WB_MPI_SYS_Init()
{
    LOG_D("******************************************\n");
    LOG_D("step 1: Mpi System Init\n");
     LOG_D("******************************************\n");
    HI_S32 s32Ret;
    VB_CONF_S struVbConf;
    MPP_SYS_CONF_S struSysConf = {0};

    memset(&struVbConf, 0, sizeof(VB_CONF_S));
    //memcpy(&struVbConf, &VB_SYS_CONF_BASE, sizeof(struVbConf));
    struVbConf.u32MaxPoolCnt = 128;
    struVbConf.astCommPool[0].u32BlkSize = 3159360;
    struVbConf.astCommPool[0].u32BlkCnt = 12;

    HI_MPI_SYS_Exit();
    HI_MPI_VB_Exit();

    s32Ret = HI_MPI_VB_SetConf(&struVbConf);
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("SetConf failed!\n");
        return s32Ret;
    }

    s32Ret = HI_MPI_VB_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Vb Init failed!\n");
        return s32Ret;
    }

    struSysConf.u32AlignWidth = 64;
    /*set config of mpp system*/
    s32Ret = HI_MPI_SYS_SetConf(&struSysConf);
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Set mpp sys config failed!\n");
        return s32Ret;
    }

    /*init system*/
    s32Ret = HI_MPI_SYS_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Mpi sys init failed!\n");    
        return s32Ret;
    }

    LOG_D("******************************************\n");
    LOG_D("Mpi Sys Init Success\n");
     LOG_D("******************************************\n");

    return HI_SUCCESS;
    /**/
}

HI_S32 WB_MIPI_Init()
{
    HI_S32 fd;
    combo_dev_attr_t* pstcomboDevAttr = NULL;
    fd = open("/dev/hi_mipi", O_RDWR);
    if( fd < 0)
    {
        LOG_W("open hi_mipi dev failed\n");
        return -1;
    }

    pstcomboDevAttr = &SUBLVDS_4lane_SENSOR_MN34220_12BIT_1080_NOWDR_ATTR;

    if (ioctl(fd, _IOW(HI_MIPI_IOC_MAGIC, 0x01, combo_dev_attr_t), pstcomboDevAttr))    
    {
        LOG_E("set mipi attr failed\n");
        close(fd);
        return HI_FAILURE;
    }
    close(fd);
    return HI_SUCCESS;
}

HI_S32 WB_Mpp_Vi_Init(HI_VOID)
{
    LOG_D("******************************************\n");
    LOG_D("step 2: Init vi dev and chn to capture\n");
     LOG_D("******************************************\n");
    HI_S32 s32Ret;
    VI_DEV ViDev = 0;
    VI_CHN ViChn = 0;
    VI_DEV_ATTR_S stViDevAttr;
    VI_CHN_ATTR_S stChnAttr;
    ISP_WDR_MODE_S stWdrMode;

    memset(&stViDevAttr, 0, sizeof(stViDevAttr));
    memcpy(&stViDevAttr, &DEV_ATTR_LVDS_BASE, sizeof(stViDevAttr));
    stViDevAttr.stDevRect.s32X = 0;
    stViDevAttr.stDevRect.s32Y = 20;
    stViDevAttr.stDevRect.u32Width  = 1920;
    stViDevAttr.stDevRect.u32Height = 1080;
/*
    LOG_D("----%d\n",stViDevAttr.enIntfMode);
    LOG_D("----%d\n",stViDevAttr.enWorkMode);
    LOG_D("----%d\n",stViDevAttr.au32CompMask[0]);
    LOG_D("----%d\n",stViDevAttr.au32CompMask[1]);
    LOG_D("----%d\n",stViDevAttr.enScanMode);
    LOG_D("----%d\n",stViDevAttr.enDataSeq);
    LOG_D("----%d\n",stViDevAttr.enDataPath);
    LOG_D("----%d\n",stViDevAttr.enInputDataType);
    LOG_D("----%d\n",stViDevAttr.stDevRect.s32X);
    LOG_D("----%d\n",stViDevAttr.stDevRect.s32Y);
    LOG_D("----%d\n",stViDevAttr.stDevRect.u32Width);
    LOG_D("----%d\n",stViDevAttr.stDevRect.u32Height);
    LOG_D("----%d\n",stViDevAttr.bDataRev);
*/    
    s32Ret = HI_MPI_VI_SetDevAttr(ViDev, &stViDevAttr);
    if (s32Ret != HI_SUCCESS)
    {
    LOG_E("Set dev attributes failed with error code %#x!\n", s32Ret);
    return HI_FAILURE;
    }

    s32Ret = HI_MPI_ISP_GetWDRMode(0, &stWdrMode);
    if (s32Ret != HI_SUCCESS)
    {
        LOG_E("HI_MPI_ISP_GetWDRMode failed with %#x!\n", s32Ret);
        return HI_FAILURE;
    }

    if (stWdrMode.enWDRMode)  //wdr mode
    {
        VI_WDR_ATTR_S stWdrAttr;

        stWdrAttr.enWDRMode = stWdrMode.enWDRMode;
        stWdrAttr.bCompress = HI_FALSE;

        s32Ret = HI_MPI_VI_SetWDRAttr(0, &stWdrAttr);
        if (s32Ret)
        {
            LOG_E("HI_MPI_VI_SetWDRAttr failed with %#x!\n", s32Ret);
            return HI_FAILURE;
        }
    }

    s32Ret = HI_MPI_VI_EnableDev(ViDev);
    if (s32Ret != HI_SUCCESS)
    {
    LOG_E("Enable dev failed with error code %#x!\n", s32Ret);
    return HI_FAILURE;
    }

    stChnAttr.stCapRect.s32X = 0;
    stChnAttr.stCapRect.s32Y = 0;
    stChnAttr.stCapRect.u32Width = 1920;
    stChnAttr.stCapRect.u32Height = 1080;
    stChnAttr.stDestSize.u32Width = 1920;
    stChnAttr.stDestSize.u32Height = 1080;
    stChnAttr.enCapSel = VI_CAPSEL_BOTH;
    stChnAttr.enPixFormat = PIXEL_FORMAT_YUV_SEMIPLANAR_420;
    stChnAttr.bMirror = HI_FALSE;
    stChnAttr.bFlip = HI_FALSE;
    stChnAttr.s32SrcFrameRate = -1;
    stChnAttr.s32DstFrameRate = -1;
    stChnAttr.enCompressMode = COMPRESS_MODE_NONE;

/*
    LOG_D("----%d\n",stChnAttr.stCapRect.s32X);
    LOG_D("----%d\n",stChnAttr.stCapRect.s32Y);
    LOG_D("----%d\n",stChnAttr.stCapRect.u32Width);
    LOG_D("----%d\n",stChnAttr.stCapRect.u32Height);
    LOG_D("----%d\n",stChnAttr.stDestSize.u32Width );
    LOG_D("----%d\n",stChnAttr.stDestSize.u32Height );
    LOG_D("----%d\n",stChnAttr.enCapSel);
    LOG_D("----%d\n",stChnAttr.enPixFormat);
    LOG_D("----%d\n",stChnAttr.bMirror);
    LOG_D("----%d\n",stChnAttr.bFlip);
    LOG_D("----%d\n",stChnAttr.s32SrcFrameRate);
    LOG_D("----%d\n",stChnAttr.s32DstFrameRate);
    LOG_D("----%d\n",stChnAttr. enCompressMode);
*/
    s32Ret = HI_MPI_VI_SetChnAttr(ViChn,&stChnAttr);
    if (s32Ret != HI_SUCCESS)
    {
    LOG_E("Set chn attributes failed with error code %#x!\n", s32Ret);
    return HI_FAILURE;
    }

    s32Ret = HI_MPI_VI_EnableChn(ViChn);
    if (s32Ret != HI_SUCCESS)
    {
    LOG_E("Enable chn failed with error code %#x!\n", s32Ret);
    return HI_FAILURE;
    }

    LOG_D("******************************************\n");
    LOG_D("now, vi is capturing images\n");
     LOG_D("******************************************\n");

     return HI_SUCCESS;
     /* now, vi is capturing images, you can do something else ... */
    /*s32Ret = HI_MPI_VI_DisableChn(ViChn);
    if (s32Ret != HI_SUCCESS)
    {
    LOG_D("Disable chn failed with error code %#x!\n", s32Ret);
    return HI_FAILURE;
    }
    s32Ret = HI_MPI_VI_DisableDev(ViDev);
    if (s32Ret != HI_SUCCESS)
    {
    LOG_D("Disable dev failed with error code %#x!\n", s32Ret);
    return HI_FAILURE;
    }*/

}

HI_S32 WB_MPI_VENC_Init()
{

    LOG_D("******************************************\n");
    LOG_D("step 3:  Create Venc Chn\n");
     LOG_D("******************************************\n");

    HI_S32 s32Ret;
    VI_CHN ViChn = 0;
    VENC_CHN VencChn = 0;
    VENC_ATTR_JPEG_S stJpegAttr;    

    VENC_CHN_ATTR_S stVencChnAttr;
    MPP_CHN_S stSrcChn, stDestChn;

    stVencChnAttr.stVeAttr.enType = PT_JPEG;
    stJpegAttr.u32PicWidth = 1920;
    stJpegAttr.u32PicHeight = 1080;
    stJpegAttr.u32MaxPicWidth = 1920;
    stJpegAttr.u32MaxPicHeight = 1080;
    stJpegAttr.u32BufSize = 1920*1080*2;
    stJpegAttr.bByFrame = HI_TRUE;
    stJpegAttr.bSupportDCF = HI_FALSE;
    memcpy(&stVencChnAttr.stVeAttr.stAttrJpeg, &stJpegAttr, sizeof(VENC_ATTR_JPEG_S));

    s32Ret = HI_MPI_VENC_CreateChn(VencChn, &stVencChnAttr);
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Hi Mpi Venc CreateChn Failed with %#x!\n", s32Ret);
        return s32Ret;
    }

    LOG_D("******************************************\n");
    LOG_D("step 4:  Start Recv Venc Pictures\n");
     LOG_D("******************************************\n");

     //s32Ret = HI_MPI_VENC_StartRecvPic(VencChn);
     //if(HI_SUCCESS != s32Ret)
     //{
     //    LOG_E("Hi Mpi Venc Start Recv Failed with %#x!\n", s32Ret);
    //    return s32Ret;
     //}

     stSrcChn.enModId = HI_ID_VIU;
     stSrcChn.s32DevId = 0;
     stSrcChn.s32ChnId = ViChn;

     stDestChn.enModId = HI_ID_VENC;
     stDestChn.s32DevId = 0;
     stDestChn.s32ChnId = 0;

     s32Ret = HI_MPI_SYS_Bind(&stSrcChn, &stDestChn);

    return HI_SUCCESS;
}

HI_S32 WB_VENC_SaveJpeg(FILE* pFile, VENC_STREAM_S* pstVencStream)
{
    VENC_PACK_S* pstData;
    HI_U32 i;

    for(i = 0; i < pstVencStream->u32PackCount; i++)
    {
        pstData = &pstVencStream->pstPack[i];
        fwrite(pstData->pu8Addr + pstData->u32Offset, pstData->u32Len - pstData->u32Offset, 1, pFile);
        fflush(pFile);
    }

    return HI_SUCCESS;
}

HI_S32 WB_Venc_SaveSnap(VENC_STREAM_S* pstVencStream)
{
    char acFile[FILE_NAME_LEN] = {0};
    FILE* pFile;
    HI_S32 s32Ret;

    snprintf(acFile, FILE_NAME_LEN, "Mysnap.jpg" );
    pFile = fopen(acFile, "wb");
    if(pFile == NULL)
    {
        LOG_E("open file error");
        return HI_FAILURE;
    }
    s32Ret = WB_VENC_SaveJpeg(pFile, pstVencStream);
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("save snap picture failed!\n");
        return HI_FAILURE;
    }
    fclose(pFile);
    gs_s32SnapCnt++;
    return HI_SUCCESS;

}

HI_S32 WB_VENC_GetVencSnapProc(VENC_CHN VencChn)
{
    LOG_D("******************************************\n");
    LOG_D("step 5:  Get Venc Snap Start\n");
     LOG_D("******************************************\n");
     sleep(2);

    HI_S32 s32Ret;
    //HI_S32 s32Cnt = 0;
    HI_S32 s32VencFd;
    fd_set read_fds;
    struct timeval timeout;
    VENC_STREAM_S stVencStream;
    VENC_CHN_STAT_S stVencChnStat;
    VENC_RECV_PIC_PARAM_S stRecvParam;

    //HI_CHAR aszFileName[VENC_MAX_CHN_NUM][64];
    //char szFilePostfix[10];

    stRecvParam.s32RecvPicNum = 1;
    s32Ret = HI_MPI_VENC_StartRecvPicEx(VencChn, &stRecvParam);
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("HI_MPI_VENC_StartRecvPic faild with%#x!\n", s32Ret);
    }

    s32VencFd = HI_MPI_VENC_GetFd(VencChn);
    if(s32VencFd < 0)
    {
        LOG_E("HI_MPI Venc GetFd failed with %#x!\n", s32VencFd);
        return -1;
    }

    FD_ZERO(&read_fds);
    FD_SET(s32VencFd, &read_fds);

    timeout.tv_sec = 2;
    timeout.tv_usec = 0;

    LOG_D(" Venc GetFd is %d\n", s32VencFd);
    s32Ret = select(s32VencFd +1, &read_fds, NULL, NULL, &timeout);
    if(s32Ret < 0)
    {
        LOG_E("snap select failed!\n");
    }
    else if (s32Ret == 0)
    {
        LOG_E("Get Venc Stream time out !\n");
         return s32Ret;
    }
    else
    {    
        if(FD_ISSET(s32VencFd, &read_fds))
        {
            s32Ret = HI_MPI_VENC_Query(VencChn, &stVencChnStat);
            if(HI_SUCCESS != s32Ret)
            {
            LOG_E("Mpi Venc Query failed with %#x!\n", s32Ret);
            return s32Ret;
            }

            if(0 == stVencChnStat.u32CurPacks)
            {
                LOG_E("NOTE: Current Frame is NULL!\n");
                return HI_SUCCESS;
            }

            stVencStream.pstPack = (VENC_PACK_S* )malloc(sizeof(VENC_PACK_S) * stVencChnStat.u32CurPacks);
            if(NULL == stVencStream.pstPack)
            {
                LOG_E("malloc memory failed!\n");
                return s32Ret;
            }

            stVencStream.u32PackCount = stVencChnStat.u32CurPacks;
            s32Ret = HI_MPI_VENC_GetStream(VencChn, &stVencStream, -1);
            if(HI_SUCCESS != s32Ret)
            {
                LOG_E("Hi Mpi Venc GetStream failed with %#x!\n", s32Ret);
                free(stVencStream.pstPack);
                stVencStream.pstPack = NULL;
                return s32Ret;
            }

            s32Ret = WB_Venc_SaveSnap(&stVencStream);
            if(HI_SUCCESS != s32Ret)
            {
                LOG_E("Venc SaveSnap failed with %#x!\n", s32Ret);
                free(stVencStream.pstPack);
                stVencStream.pstPack = NULL;
                return s32Ret;
            }

            s32Ret = HI_MPI_VENC_ReleaseStream(VencChn, &stVencStream);
            if(s32Ret)
            {
                LOG_E("Release Stream failed with %#x!\n",s32Ret);
                free(stVencStream.pstPack);
                stVencStream.pstPack = NULL;
                return s32Ret;
            }
            free(stVencStream.pstPack);
            stVencStream.pstPack = NULL;
        }
    }

    s32Ret = HI_MPI_VENC_StopRecvPic(VencChn);

    if (s32Ret != HI_SUCCESS)
    {
        LOG_E("MPI VENC StopRecvPic failed with %#x!\n",  s32Ret);
        return s32Ret;
    }


    return HI_SUCCESS;
}

void* WB_Isp_Run_Proc(void* arg)
{
    ISP_DEV IspDev = 0;
    HI_MPI_ISP_Run(IspDev);
    return HI_NULL;
}

HI_S32 WB_VENC_ISP_Init()
{
    ISP_DEV IspDev = 0;
    HI_S32 s32Ret;
    ISP_PUB_ATTR_S stPubAttr;
    ALG_LIB_S stLib;

    s32Ret = sensor_set_inifile_path("configs/");
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("set cmos iniparser file path failed with %#x!\n", s32Ret);
        return s32Ret;
    }

    s32Ret = sensor_register_callback();
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("sensor_register_callback failed with %#x!\n", s32Ret);
        return s32Ret;
    }

    stLib.s32Id = 0;
    strcpy(stLib.acLibName, HI_AE_LIB_NAME);
    s32Ret = HI_MPI_AE_Register(IspDev, &stLib);
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("HI_MPI_AE_Register failed!\n");
        return s32Ret;
    }

    stLib.s32Id = 0;
    strcpy(stLib.acLibName, HI_AWB_LIB_NAME);
    s32Ret = HI_MPI_AWB_Register(IspDev, &stLib);
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("HI_MPI_AWB Register failed!\n");
        return s32Ret;
    }

    stLib.s32Id = 0;
    strcpy(stLib.acLibName, HI_AF_LIB_NAME);
    s32Ret = HI_MPI_AF_Register(IspDev, &stLib);
    if (s32Ret != HI_SUCCESS)
    {
        LOG_E("HI_MPI_AF Register failed!\n");
        return s32Ret;
    }

    s32Ret = HI_MPI_ISP_MemInit(IspDev);
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("HI Mpi Isp Init failed!\n");
        return s32Ret;
    }

    ISP_WDR_MODE_S stWdrMode;
    stWdrMode.enWDRMode = WDR_MODE_NONE;
    s32Ret = HI_MPI_ISP_SetWDRMode(0, &stWdrMode);
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("start ISP WDR failed!\n");
        return s32Ret;
    }

    switch(SENSOR_TYPE)
    {
        case APTINA_9M034_DC_720P_30FPS:
        LOG_E("Wrong Sensor Type\n");
        break;

        case PANASONIC_MN34220_SUBLVDS_1080P_30FPS:
        stPubAttr.enBayer                = BAYER_GRBG;
        stPubAttr.f32FrameRate            = 30;
        stPubAttr.stWndRect.s32X        = 0;
        stPubAttr.stWndRect.s32Y        = 0;
        stPubAttr.stWndRect.u32Width    = 1920;
        stPubAttr.stWndRect.u32Height     = 1080;
        break;
    }

    s32Ret = HI_MPI_ISP_SetPubAttr(IspDev, &stPubAttr);
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("Mpi Isp SetPubAttr failed with %#x!\n", s32Ret);
        return s32Ret;
    }
    s32Ret = HI_MPI_ISP_Init(IspDev);
    if(s32Ret != HI_SUCCESS)
    {
        LOG_E("Mpi ISP Init failed!\n");
    }

    if( 0 != pthread_create(&gs_IspPid, 0, (void * (*)(void *))WB_Isp_Run_Proc, NULL))
    {
        LOG_E("Create Isp Run thread failed!\n");
        return HI_FAILURE;
    }

    return HI_SUCCESS;

}


int main(int argc,char *argv[])
{
    HI_S32 s32Ret;

    signal(SIGINT, WB_VENC_HandleSig);
    signal(SIGTERM, WB_VENC_HandleSig);

    s32Ret = WB_MPI_SYS_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Mpi sys init failed!\n");
        exit(-1);
    }

    LOG_D("******************************************\n");
    LOG_D("step 1~2:  WB_MIPI_Init start\n");
     LOG_D("******************************************\n");

    s32Ret = WB_MIPI_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("MIPI init failed!\n");
        exit(-1);
    }

    LOG_D("******************************************\n");
    LOG_D("step 1~2:  WB_ISP_Init start\n");
     LOG_D("******************************************\n");
    s32Ret = WB_VENC_ISP_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("ISP init failed!\n");
        exit(-1);
    }

    s32Ret = WB_Mpp_Vi_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Mpi vi init failed!\n");
        exit(-1);
    }

    s32Ret = WB_MPI_VENC_Init();
    if(HI_SUCCESS != s32Ret)
    {
        LOG_E("Mpi venc init failed!\n");
        exit(-1);
    }

     s32Ret = WB_VENC_GetVencSnapProc(0);
     if(s32Ret != HI_SUCCESS)
     {
         LOG_E("GetVencSnapProc is Failed!\n");
         return HI_FAILURE;
     }

    getchar();

    exit(s32Ret);
}

My_Head.h

//#include <sys/time.h>

#include "hi_comm_venc.h"
#include "hi_type.h"
#include "hi_comm_vi.h"
#include "hi_comm_video.h"
#include "hi_comm_vb.h"
#include "hi_comm_sys.h"
#include "hi_mipi.h"
#include "hi_comm_3a.h"
#include "hi_comm_isp.h"
#include "hi_ae_comm.h"
#include "hi_sns_ctrl.h"
#include "hi_af_comm.h"
#include "hi_awb_comm.h"

#include "mpi_venc.h"
#include "mpi_sys.h"
#include "mpi_isp.h"
#include "mpi_af.h"
#include "mpi_vb.h"
#include "mpi_vi.h"
#include "mpi_ae.h"
#include "mpi_awb.h"

#include "sys/ioctl.h"

#define FILE_NAME_LEN 128

#define TRUE 1
#define FALSE 0

#define TAG "TEST"
#define DEBUG TRUE

/*
#define TIMEPRINT \
    do{\
    struct timeval now;\
    struct tm* ptime = NULL;\
    suseconds_t mstime;\
    \
    gettimeofday(&now, NULL);\
    ptime = gmtime(&now.tv_sec);\
    mstime = now.tv_usec/10000;\
    \
    printf("%d-%d-%d-%d-%d-%d:%02d  ", 1900 + ptime->tm_year, 1 + ptime->tm_mon, ptime->tm_mday, ptime->tm_hour, ptime->tm_min, ptime->tm_sec, mstime);\
    }while(0)
*/

#define TIMEPRINT 

#if DEBUG
#define LOG_D(...) \
        do{\
            TIMEPRINT\
            printf("D/%s ",TAG);\
            printf("(%s, %d): ", __FILE__,__LINE__);\
            printf(__VA_ARGS__);\
        }while(0)
#else
#define LOG_D(...) printf(__VA_ARGS__)
#endif

#if DEBUG
#define LOG_W(...) \
        do{\
            TIMEPRINT\
            printf("W/%s ",TAG);\
            printf("(%s, %d): ", __FILE__,__LINE__);\
            printf(__VA_ARGS__);\
        }while(0)
#else
#define LOG_W(...) printf(__VA_ARGS__)
#endif

#if DEBUG
#define LOG_E(...) \
        do{\
            TIMEPRINT\
            printf("E/%s ",TAG);\
            printf("(%s, %d): ", __FILE__,__LINE__);\
            printf(__VA_ARGS__);\
        }while(0)
#else
#define LOG_E(...) printf(__VA_ARGS__)
#endif

#if DEBUG
#define LOG_B(...) \
        do{\
            TIMEPRINT\
            printf("B/%s ",TAG);\
            printf("(%s, %d):", __FILE__,__LINE__);\
            printf(__VA_ARGS__);\
            getchar();\
        }while(0)
#else
#define LOG_B(...)  \
        do{\
            printf("Break Here!\n");\
            printf(__VA_ARGS__);\
            getchar();\
        }while(0)
#endif

typedef enum wb_vi_mode_e
{
    APTINA_AR0130_DC_720P_30FPS = 0,
    APTINA_9M034_DC_720P_30FPS,
    SAMPLE_VI_MODE_1_D1,
    SAMPLE_VI_MODE_BT1120_1080I,
    SAMPLE_VI_MODE_BT1120_720P,
    SAMPLE_VI_MODE_BT1120_1080P,
    PANASONIC_MN34220_SUBLVDS_1080P_30FPS,
    PANASONIC_MN34220_SUBLVDS_720P_120FPS,
    SONY_IMX178_LVDS_1080P_30FPS,
    SONY_IMX185_MIPI_1080P_30FPS,
    PANASONIC_MN34220_MIPI_1080P_30FPS,
    PANASONIC_MN34220_MIPI_720P_120FPS,
    SONY_IMX178_LVDS_5M_30FPS,
    SONY_IMX117_LVDS_1080P_30FPS,
    SONY_IMX117_LVDS_720P_30FPS,
    SONY_IMX123_LVDS_QXGA_30FPS,
    APTINA_AR0230_HISPI_1080P_30FPS,
    APTINA_AR0237_HISPI_1080P_30FPS,
    APTINA_AR0330_MIPI_1080P_30FPS,
    APTINA_AR0330_MIPI_1536P_25FPS,
    APTINA_AR0330_MIPI_1296P_25FPS,
    OMNIVISION_OV4689_MIPI_4M_30FPS,
    OMNIVISION_OV4689_MIPI_1080P_30FPS,
    OMNIVISION_OV5658_MIPI_5M_30FPS,
}Vi_Mode_E;

typedef struct VENC_GETSTREAMPARA_S
{
    HI_BOOL bTreadStart;
    HI_S32 s32Cnt;
}Venc_GetStreamPara_S;

VI_DEV_ATTR_S DEV_ATTR_LVDS_BASE =
{
    /* interface mode */
    VI_MODE_LVDS,
    /* multiplex mode */
    VI_WORK_MODE_1Multiplex,
    /* r_mask    g_mask    b_mask*/
    {0xFFF00000,    0x0},
    /* progessive or interleaving */
    VI_SCAN_PROGRESSIVE,
    /*AdChnId*/
    { -1, -1, -1, -1},
    /*enDataSeq, only support yuv*/
    VI_INPUT_DATA_YUYV,

    /* synchronization information */
    {
        /*port_vsync   port_vsync_neg     port_hsync        port_hsync_neg        */
        VI_VSYNC_PULSE, VI_VSYNC_NEG_LOW, VI_HSYNC_VALID_SINGNAL, VI_HSYNC_NEG_HIGH, VI_VSYNC_VALID_SINGAL, VI_VSYNC_VALID_NEG_HIGH,

        /*hsync_hfb    hsync_act    hsync_hhb*/
        {
            0,            1280,        0,
            /*vsync0_vhb vsync0_act vsync0_hhb*/
            0,            720,        0,
            /*vsync1_vhb vsync1_act vsync1_hhb*/
            0,            0,            0
        }
    },
    /* use interior ISP */
    VI_PATH_ISP,
    /* input data type */
    VI_DATA_TYPE_RGB,
    /* bRever */
    HI_FALSE,
    /* DEV CROP */
    {0, 0, 1920, 1080}
};

//VB_CONF_S VB_SYS_CONF_BASE =
//{
    /*Max Pool count*/
//    128,
    /*Vb Pool Stru*/
//    {
        /*BlkSize*/ 
//        3159360,
        /* BlkCnt  */
//        20
        /*acMmzName*/
//    }
//};

combo_dev_attr_t MIPI_4lane_SENSOR_MN34220_MIPI_12BIT_ATTR =
{
    .input_mode = INPUT_MODE_MIPI,
    {
        .mipi_attr =
        {
            RAW_DATA_12BIT,
            {0, 1, 2, 3, -1, -1, -1, -1}
        }
    }

};

combo_dev_attr_t SUBLVDS_4lane_SENSOR_MN34220_12BIT_1080_NOWDR_ATTR =
{
    /* input mode */
    .input_mode = INPUT_MODE_SUBLVDS,

    {
        .lvds_attr = {
            .img_size = {1920, 1080},
            HI_WDR_MODE_NONE,
            LVDS_SYNC_MODE_SOL,
            RAW_DATA_12BIT,
            LVDS_ENDIAN_BIG,
            LVDS_ENDIAN_BIG,
            .lane_id = {0, 2, -1, -1, 1, 3, -1, -1},
            .sync_code =  {
                {   {0x002, 0x003, 0x000, 0x001}, //PHY0_lane0
                    {0x202, 0x203, 0x200, 0x201},
                    {0x102, 0x103, 0x100, 0x101},
                    {0x302, 0x303, 0x300, 0x301}
                },

                {   {0x006, 0x007, 0x004, 0x005}, //PHY0_lane1
                    {0x206, 0x207, 0x204, 0x205},
                    {0x106, 0x107, 0x104, 0x105},
                    {0x306, 0x307, 0x304, 0x305}
                },

                {   {0x00a, 0x00b, 0x008, 0x009}, //PHY0_lane2
                    {0x20a, 0x20b, 0x208, 0x209},
                    {0x10a, 0x10b, 0x108, 0x109},
                    {0x30a, 0x30b, 0x308, 0x309}
                },

                {   {0x00a, 0x00b, 0x008, 0x009}, //PHY0_lane3  INPUT_MODE_LVDS
                    {0x20a, 0x20b, 0x208, 0x209},
                    {0x10a, 0x10b, 0x108, 0x109},
                    {0x30a, 0x30b, 0x308, 0x309}
                },

                {   {0x012, 0x013, 0x010, 0x011},//PHY1_lane0
                    {0x212, 0x213, 0x210, 0x211},
                    {0x112, 0x113, 0x110, 0x111},
                    {0x312, 0x313, 0x310, 0x311}
                },

                {   {0x016, 0x017, 0x014, 0x015}, //PHY1_lane1
                    {0x216, 0x217, 0x214, 0x215},
                    {0x116, 0x117, 0x114, 0x115},
                    {0x316, 0x317, 0x314, 0x315}
                },

                {   {0x01a, 0x01b, 0x018, 0x019}, //PHY1_lane2
                    {0x21a, 0x21b, 0x218, 0x219},
                    {0x11a, 0x11b, 0x118, 0x119},
                    {0x31a, 0x31b, 0x318, 0x319}
                },

                {   {0x01a, 0x01b, 0x018, 0x019}, //PHY1_lane3
                    {0x21a, 0x21b, 0x218, 0x219},
                    {0x11a, 0x11b, 0x118, 0x119},
                    {0x31a, 0x31b, 0x318, 0x319}
                }
            }
        }
    }
};

Makefile

#
#
#
#
SRC := $(wildcard *.c)
OBJ := $(SRC:%.c=%.o)
TARGET := sample
#CC :=gcc
CC := arm-hisiv300-linux-gcc

CFLAGS := -g -Wall -ldl -DSENSOR_TYPE=PANASONIC_MN34220_SUBLVDS_1080P_30FPS
CFLAGS += -I../include/
CFLAGS += -Dhi3516a -DHICHIP=0x3516A100 -DISP_V2 -DHI_MIPI_ENABLE -DHI_ACODEC_TYPE_INNER -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 -ffunction-sections -mno-unaligned-access -fno-aggressive-loop-optimizations

MPILIB := ../lib/libmpi.a
ISPLIB := ../lib/libisp.a ../lib/lib_hiae.a
SENSORLIB := ../lib/libsns_mn34220.a 
AUDIO_LIBS :=../lib/libupvqe.a ../lib/libdnvqe.a ../lib/libVoiceEngine.a
OTHERLIB := ../lib/lib_hiawb.a ../lib/lib_hidefog.a ../lib/lib_hiaf.a

all: $(OBJ) $(TARGET)
$(TARGET):
    @echo "SRC is " $(SRC)
    @echo "OBJ is " $(OBJ)
    @echo "TARGET is " $(TARGET)
    $(CC) $(CFLAGS) $(OBJ) -lpthread -lm -o $(TARGET) $(ISPLIB) $(MPILIB) $(SENSORLIB) $(OTHERLIB) $(AUDIO_LIBS)

.PHONY: clean target
clean:
    rm -rf $(OBJ) $(TARGET)

target:
#@source /etc/profile
    rm -rf $(OBJ) $(TARGET)
    make

测试: ./sample

通过其他设置接口增加功能
我们已经实现了最简化的VI视频采集了，接着可以在此基础上通过其他设置接口进行更复杂功能的设计如HI_MPI_VI_SetExtChnCrop()进行裁剪、HI_MPI_VI_SetLDCAttr()设置 VI 镜头畸变校正（LDC）属性、HI_MPI_VI_SetCSCAttr()调节图像的亮度、色调、对比度、饱和度等等。

至此本文关于海思VI模块的学习就结束了，学习中会遇到很多音视频方面的东西，像隔行扫描制式，YUV颜色图像编码方法等等，这些还没有做详细的解释，如果有机会再追加写一篇关于这些音视频方面的知识。