MultiCast.cpp

设置组播模式

该示例程序说明了如何设置传输模式为组播模式。通过询问用户启动多播控制应用程序或者多播监控应用程序，然后根据用户输入，以对应的访问权限打开相机，最后通过 MV_GIGE_SetTransmissionType() 设置组播模式。

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include "MvCameraControl.h"

bool g_bExit = false;
unsigned int g_nPayloadSize = 0;

// 等待用户输入enter键来结束取流或结束程序
// wait for user to input enter to stop grabbing or end the sample program
void PressEnterToExit(void)
{
    int c;
    while ( (c = getchar()) != '\n' && c != EOF );
    fprintf( stderr, "\nPress enter to exit.\n");
    while( getchar() != '\n');
    g_bExit = true;
    sleep(1);
}

bool PrintDeviceInfo(MV_CC_DEVICE_INFO* pstMVDevInfo)
{
    if (NULL == pstMVDevInfo)
    {
        printf("The Pointer of pstMVDevInfo is NULL!\n");
        return false;
    }
    if (pstMVDevInfo->nTLayerType == MV_GIGE_DEVICE)
    {
        int nIp1 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0xff000000) >> 24);
        int nIp2 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x00ff0000) >> 16);
        int nIp3 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x0000ff00) >> 8);
        int nIp4 = (pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x000000ff);

        // ch:打印当前相机ip和用户自定义名字 | en:print current ip and user defined name
        printf("Device Model Name: %s\n", pstMVDevInfo->SpecialInfo.stGigEInfo.chModelName);
        printf("CurrentIp: %d.%d.%d.%d\n" , nIp1, nIp2, nIp3, nIp4);
        printf("UserDefinedName: %s\n\n" , pstMVDevInfo->SpecialInfo.stGigEInfo.chUserDefinedName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_USB_DEVICE)
    {
        printf("Device Model Name: %s\n", pstMVDevInfo->SpecialInfo.stUsb3VInfo.chModelName);
        printf("UserDefinedName: %s\n\n", pstMVDevInfo->SpecialInfo.stUsb3VInfo.chUserDefinedName);
    }
    else
    {
        printf("Not support.\n");
    }

    return true;
}

static void*  WorkThread(void* pUser)
{
    int nRet = MV_OK;

    MV_FRAME_OUT_INFO_EX stImageInfo = {0};
    memset(&stImageInfo, 0, sizeof(MV_FRAME_OUT_INFO_EX));
    unsigned char * pData = (unsigned char *)malloc(sizeof(unsigned char) * (g_nPayloadSize));
    if (pData == NULL)
    {
        return 0;
    }
    unsigned int nDataSize = g_nPayloadSize;

    while(1)
    {
        nRet = MV_CC_GetOneFrameTimeout(pUser, pData, nDataSize, &stImageInfo, 1000);
        if (nRet == MV_OK)
        {
            printf("Get One Frame: Width[%d], Height[%d], nFrameNum[%d]\n", 
                stImageInfo.nWidth, stImageInfo.nHeight, stImageInfo.nFrameNum);
        }
        else
        {
            printf("No data[0x%x]\n", nRet);
        }
        if(g_bExit)
        {
            break;
        }
    }

    free(pData);

    return 0;
}

int main()
{
    int nRet = MV_OK;
    void* handle = NULL;

    do 
    {
        // ch:枚举设备 |en:Enum device
        MV_CC_DEVICE_INFO_LIST stDeviceList;
        memset(&stDeviceList, 0, sizeof(MV_CC_DEVICE_INFO_LIST));
        nRet = MV_CC_EnumDevices(MV_GIGE_DEVICE | MV_USB_DEVICE, &stDeviceList);
        if (MV_OK != nRet)
        {
            printf("Enum Devices fail! nRet [0x%x]\n", nRet);
            break;
        }

        if (stDeviceList.nDeviceNum > 0)
        {
            for (unsigned int i = 0; i < stDeviceList.nDeviceNum; i++)
            {
                printf("[device %d]:\n", i);
                MV_CC_DEVICE_INFO* pDeviceInfo = stDeviceList.pDeviceInfo[i];
                if (NULL == pDeviceInfo)
                {
                    break;
                } 
                PrintDeviceInfo(pDeviceInfo);
            }  
        } 
        else
        {
            printf("Find No Devices!\n");
            break;
        }

        printf("Please Intput camera index: ");
        unsigned int nIndex = 0;
        scanf("%d", &nIndex);

        if (nIndex >= stDeviceList.nDeviceNum)
        {
            printf("Intput error!\n");
            break;
        }

        // ch:选择设备并创建句柄 | en:select device and create handle
        nRet = MV_CC_CreateHandle(&handle, stDeviceList.pDeviceInfo[nIndex]);
        if (MV_OK != nRet)
        {
            printf("Create Handle fail! nRet [0x%x]\n", nRet);
            break;
        }
        
        int c;
        while ( (c = getchar()) != '\n' && c != EOF );
        
        char key;
        
        // ch:询问用户启动多播控制应用程序或多播监控应用程序
        // en:Ask the user to launch: the multicast controlling application or the multicast monitoring application.
        printf("Start multicast sample in (c)ontrol or in (m)onitor mode? (c/m)\n"); 
        scanf("%c", &key);
        
        if((key != 'c') && (key != 'm') && (key != 'C') && (key != 'M'))
        {
            printf("Input error\n");
            break;
        }
        
        // ch:查询用户使用的模式 | en:Query the user for the mode to use.
        bool monitorMode = (key == 'm') || (key == 'M');

        // ch:打开设备 | Open device
        if (monitorMode)
        {
            nRet = MV_CC_OpenDevice(handle, MV_ACCESS_Monitor);
        }
        else
        {
            nRet = MV_CC_OpenDevice(handle, MV_ACCESS_Control);
        }
        if (MV_OK != nRet)
        {
            printf("Open Device fail! nRet [0x%x]\n", nRet);
            break;
        }
                
        // ch:探测网络最佳包大小(只对GigE相机有效) | en:Detection network optimal package size(It only works for the GigE camera)
        if (MV_GIGE_DEVICE == stDeviceList.pDeviceInfo[nIndex]->nTLayerType &&  false == monitorMode)
        {
            int nPacketSize = MV_CC_GetOptimalPacketSize(handle);
            if (nPacketSize > 0)
            {
                nRet = MV_CC_SetIntValue(handle,"GevSCPSPacketSize",nPacketSize);
                if(nRet != MV_OK)
                {
                    printf("Warning: Set Packet Size fail nRet [0x%x]!\n", nRet);
                }
            }
            else
            {
                printf("Warning: Get Packet Size fail nRet [0x%x]!\n", nPacketSize);
            }
        }

        
        // ch:获取数据包大小 | en:Get payload size
        MVCC_INTVALUE stParam;
        memset(&stParam, 0, sizeof(MVCC_INTVALUE));
        nRet = MV_CC_GetIntValue(handle, "PayloadSize", &stParam);
        if (MV_OK != nRet)
        {
            printf("Get PayloadSize fail! nRet [0x%x]\n", nRet);
            break;
        }
        g_nPayloadSize = stParam.nCurValue;

        // ch:指定组播ip | en:multicast IP
        char strIp[] = "239.192.1.1";
        unsigned int nIp1, nIp2, nIp3, nIp4, nIp;
        sscanf(strIp, "%d.%d.%d.%d", &nIp1, &nIp2, &nIp3, &nIp4);
        nIp = (nIp1 << 24) | (nIp2 << 16) | (nIp3 << 8) | nIp4;

        // ch:可指定端口号作为组播组端口 | en:multicast port
        MV_TRANSMISSION_TYPE stTransmissionType;
        memset(&stTransmissionType, 0, sizeof(MV_TRANSMISSION_TYPE));

        stTransmissionType.enTransmissionType = MV_GIGE_TRANSTYPE_MULTICAST;
        stTransmissionType.nDestIp = nIp;
        stTransmissionType.nDestPort = 1042;
        nRet = MV_GIGE_SetTransmissionType(handle, &stTransmissionType);
        if (MV_OK != nRet)
        {
            printf("Set Transmission Type fail! nRet [0x%x]\n", nRet);
            break;
        }

        // ch:开始取流 | en:Start grab image
        nRet = MV_CC_StartGrabbing(handle);
        if (MV_OK != nRet)
        {
            printf("Start Grabbing fail! nRet [0x%x]\n", nRet);
            break;
        }

        pthread_t nThreadID = 0;
        nRet = pthread_create(&nThreadID, NULL ,WorkThread , handle);
        if (nRet != 0)
        {
            break;
        }

        printf("Press a key to stop grabbing.\n");
        PressEnterToExit();

        g_bExit = true;
        sleep(1);

        // ch:停止取流 | en:Stop grab image
        nRet = MV_CC_StopGrabbing(handle);
        if (MV_OK != nRet)
        {
            printf("Stop Grabbing fail! nRet [0x%x]\n", nRet);
            break;
        }

        // ch:关闭设备 | en:Close device
        nRet = MV_CC_CloseDevice(handle);
        if (MV_OK != nRet)
        {
            printf("ClosDevice fail! nRet [0x%x]\n", nRet);
            break;
        }

        // ch:销毁句柄 | en:Destroy handle
        nRet = MV_CC_DestroyHandle(handle);
        if (MV_OK != nRet)
        {
            printf("Destroy Handle fail! nRet [0x%x]\n", nRet);
            break;
        }
    } while (0);


    if (nRet != MV_OK)
    {
        if (handle != NULL)
        {
            MV_CC_DestroyHandle(handle);
            handle = NULL;
        }
    }

    printf("exit.\n");

    return 0;
}