linux设备上的Onvif 实现8：编写媒体信息获取程序

1   背景

   在前文中获取到了媒体信息URI  http://192.168.15.240/onvif/Media， 本文将向这个地址查询设备的具体媒体配置信息，将返回视频源分辨率、编码器分辨率、编码格式、帧率、码率、多播地址等信息。

2 GetProfiles

获取媒体信息函数是GetProfiles，在我的版本中实际名称是：

SOAP_FMAC5 int SOAP_FMAC6 soap_call___ns8__GetProfiles(struct soap *soap, const char *soap_endpoint, const char *soap_action, struct _ns8__GetProfiles *ns8__GetProfiles, struct _ns8__GetProfilesResponse *ns8__GetProfilesResponse)
我只研究了关于Media类别的配置信息，其它类别没有尝试过。

事实上，一个摄像头一般都有2个通道，一个是主通道，提供高清视频，用于本地查看及录像；另一个是子通道，提供普通视频，用于远程查看（例如手机访问、远程PC访问）。这两个通道各有一份配置文件，因此，该函数应答包中包含两份数据。

3 我的代码实例：

/******************************************************************************
* Name:   MyGetProfiles
*
* Desc:   获取指定设备节点的媒体信息
    struct soap *soap,
    int index, 设备节点序号

* Return: BOOL,  TRUE: success,  FALSE: fail
* Global:  
* Note:  
* Author:   Tom-hongtao.gao
* -------------------------------------
* Log:   2013/07/24, Create this function by Tom-hongtao.gao
 ******************************************************************************/
BOOL MyGetProfiles(struct soap *soap, int index)
{   
    BOOL bret=FALSE;
    int result = 0;
   
    DEVICENODE * deviceode = DLFindbyIndex(index);
    if(!deviceode)
    {
        printf("--Error: DLFindbyIndex(%d) return NULL! \n", index);
        return FALSE;
    }
    if(deviceode->mediauri==NULL || strlen(deviceode->mediauri)==0)
    {
        printf("--Error: deviceode->mediauri is NULL! \n");
        return FALSE;
    }
   
    struct _ns8__GetProfiles getProfilesReq;
    struct _ns8__GetProfilesResponse getProfilesResponse={0};  
    result = soap_call___ns8__GetProfiles(soap, deviceode->mediauri, NULL, &getProfilesReq, &getProfilesResponse);
    if(result==-1)       
    {
        printf("soap error: %d, %s, %s\n", soap->error, *soap_faultcode(soap), *soap_faultstring(soap));
        result = soap->error;
        bret = FALSE;       
    }
    else
    {       
        if(getProfilesResponse.__sizeProfiles<=0)
        {
            printf(" GetProfiles  failed!  result=%d \n",result);
            bret = FALSE; 
        }
        else
        {
            printf(" GetProfiles  OK!  result=%d \n",result);
            int i;
            int count = getProfilesResponse.__sizeProfiles;
            //printf(" getProfilesResponse.__sizeProfiles=%d \n", count);
           
            for(i=0;i<2;i++)
            {  
                #if 0
                printf(" Profiles[%d]->Name=%s \n", i,getProfilesResponse.Profiles->Name);
                printf(" Profiles[%d]->token=%s \n",i,getProfilesResponse.Profiles->token);
                printf(" Profiles[%d]->fixed=%s \n", i,getProfilesResponse.Profiles->fixed);
                printf(" Profiles[%d]->VideoEncoderConfiguration->Name=%s \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->Name); 
                printf(" Profiles[%d]->VideoEncoderConfiguration->token=%s \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->token);
                printf(" Profiles[%d]->VideoEncoderConfiguration->Encoding=%d \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->Encoding);
                printf(" Profiles[%d]->VideoEncoderConfiguration->Resolution->Width=%d \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->Resolution->Width);
                printf(" Profiles[%d]->VideoEncoderConfiguration->Resolution->Height=%d \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->Resolution->Height);
                printf(" Profiles[%d]->VideoEncoderConfiguration->RateControl->FrameRateLimit=%d \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->RateControl->FrameRateLimit);
                printf(" Profiles[%d]->VideoEncoderConfiguration->RateControl->BitrateLimit=%d \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->RateControl->BitrateLimit);
                printf(" Profiles[%d]->VideoEncoderConfiguration->H264->H264Profile=%d \n", i,getProfilesResponse.Profiles->VideoEncoderConfiguration->H264->H264Profile);
                #endif
               
                PROFILE profile;
                memset(&profile, 0, sizeof(PROFILE));
                strncpy(profile.Name, getProfilesResponse.Profiles->Name, MAXSTRLEN);
                strncpy(profile.token,getProfilesResponse.Profiles->token, MAXSTRLEN);
                strncpy(profile.VideoEncoderConfigurationtoken,getProfilesResponse.Profiles->VideoEncoderConfiguration->token, MAXSTRLEN);
                profile.Encoding       = getProfilesResponse.Profiles->VideoEncoderConfiguration->Encoding;
                profile.H264Profile    = getProfilesResponse.Profiles->VideoEncoderConfiguration->H264->H264Profile;
                profile.Width          = getProfilesResponse.Profiles->VideoEncoderConfiguration->Resolution->Width;
                profile.Height         = getProfilesResponse.Profiles->VideoEncoderConfiguration->Resolution->Height;
                profile.FrameRateLimit = getProfilesResponse.Profiles->VideoEncoderConfiguration->RateControl->FrameRateLimit;
                profile.BitrateLimit   = getProfilesResponse.Profiles->VideoEncoderConfiguration->RateControl->BitrateLimit;
                profile.support        = 0;           
                DLSetProfile(index, i, &profile);
                //PrintfNodebyIndex(index);
                getProfilesResponse.Profiles++;  //???ò??????profile
            }
            bret = TRUE;     

        }       
    }

    soap_end(soap);
    return bret;
   
}

4 实际报文包

电脑IP 192.168.0.75，发出GetProfiles命令，网络摄像头应答。

略