3518EV200 SDK学习1

这个SDK里面有一个三路编码h264的流，另外一个是JPEG抓拍的。

虽然文档里面建议通道0进行抓拍，SDK用的通道1. 将其入到三路码流之后。通道3。

开始一直错误，VpssChn = 3;没有设定，设定如下：

//抓拍的通道       获取图像'小
		s32Ret = SAMPLE_COMM_SYS_GetPicSize(gs_enNorm, enSize[0], &stSize);
	    if (HI_SUCCESS != s32Ret)
	    {
	        SAMPLE_PRT("SAMPLE_COMM_SYS_GetPicSize failed!\n");
	        goto END_VENC_1080P_CLASSIC_4;
	    }
		VpssChn = 3;
		stVpssChnMode.enChnMode 	= VPSS_CHN_MODE_USER;
		stVpssChnMode.bDouble		= HI_FALSE;
		stVpssChnMode.enPixelFormat = PIXEL_FORMAT_YUV_SEMIPLANAR_420;
		stVpssChnMode.u32Width		= stSize.u32Width;
		stVpssChnMode.u32Height 	= stSize.u32Height;
		stVpssChnMode.enCompressMode = COMPRESS_MODE_NONE;

		memset(&stVpssChnAttr, 0, sizeof(stVpssChnAttr));
		stVpssChnAttr.s32SrcFrameRate = -1;
		stVpssChnAttr.s32DstFrameRate = -1;
		
		s32Ret = SAMPLE_COMM_VPSS_EnableChn(VpssGrp, VpssChn, &stVpssChnAttr, &stVpssChnMode, HI_NULL);
		if (HI_SUCCESS != s32Ret)
		{
			SAMPLE_PRT("Enable vpss chn failed!\n");
			goto END_VENC_1080P_CLASSIC_4;
		}

　之后就是绑定和获取图片

	//hg 添加拍照功能 2018-12-24
	VpssGrp = 0;
    VpssChn = 3;
    VencChn = 3;
	s32Ret = SAMPLE_COMM_VENC_SnapStart(VpssChn,&stSize,HI_FALSE);
	if(HI_SUCCESS !=s32Ret)
	{
		SAMPLE_PRT("Start snap failed!\n");
		goto END_VENC_JPEG_6;
	}
	s32Ret = SAMPLE_COMM_VENC_BindVpss(VencChn, VpssGrp, VpssChn);
	if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_PRT("Start Venc failed!\n");
        goto END_VENC_JPEG_6;
    }

　　三个图可以直观的观察vpss: