DVRRDK DM8168

Hello,everyone.

I am using DVRRRDK3.0 with DM8168.The McFW demo can run correctly，but I have some doubts about the formate about the Video stream.

In multich_vcap_vdis.c file，it gives code framework as follow：

The video stream and video formate in different period can be summarized as follow：

Capture（YUV422I）------>NSF（YUV420SP）------>DEI（YUV420）------>Merge------>Dup------>SW Mosaic（YUV422I）------>HDMI display

The related video formate configuration codes is as follow（Highlight in RED）：

for(vipInstId=0; vipInstId<capturePrm.numVipInst; vipInstId++)

    {

        pCaptureInstPrm                     = &capturePrm.vipInst[vipInstId];

        pCaptureInstPrm->vipInstId          = (SYSTEM_CAPTURE_INST_VIP0_PORTA+vipInstId)%SYSTEM_CAPTURE_INST_MAX;

        pCaptureInstPrm->videoDecoderId     = SYSTEM_DEVICE_VID_DEC_TVP5158_DRV;

        pCaptureInstPrm->inDataFormat       = SYSTEM_DF_YUV422P;

        pCaptureInstPrm->standard           = SYSTEM_STD_MUX_4CH_D1;

        pCaptureInstPrm->numOutput          = 1;

        pCaptureOutPrm                      = &pCaptureInstPrm->outParams[0];

        pCaptureOutPrm->dataFormat          = SYSTEM_DF_YUV422I_YUYV;

        pCaptureOutPrm->scEnable            = FALSE;

        pCaptureOutPrm->scOutWidth          = 0;

        pCaptureOutPrm->scOutHeight         = 0;

        pCaptureOutPrm->outQueId            = 0;

}

    for(i = 0; i < NUM_CAPTURE_DEVICES; i++)

    {

        vidDecVideoModeArgs[i].videoIfMode        = DEVICE_CAPT_VIDEO_IF_MODE_8BIT;

        vidDecVideoModeArgs[i].videoDataFormat    = SYSTEM_DF_YUV422P;

        vidDecVideoModeArgs[i].standard           = SYSTEM_STD_MUX_4CH_D1;

        vidDecVideoModeArgs[i].videoCaptureMode   =

                    DEVICE_CAPT_VIDEO_CAPTURE_MODE_MULTI_CH_PIXEL_MUX_EMBEDDED_SYNC;

        vidDecVideoModeArgs[i].videoSystem        =

                                      DEVICE_VIDEO_DECODER_VIDEO_SYSTEM_AUTO_DETECT;

        vidDecVideoModeArgs[i].videoCropEnable    = FALSE;

        vidDecVideoModeArgs[i].videoAutoDetectTimeout = -1;

    }

…..

        deiPrm[i].comprEnable                                   = FALSE;

        deiPrm[i].setVipScYuv422Format                          = FALSE;

But I do not know exactly why these video foment codes are configured as this. I use the DVD as the Video source, the board I used is DM8168EVM+TVP5158.  

（1）Capture Configuration

pCaptureInstPrm->inDataFormat       = SYSTEM_DF_YUV422P;  // How does this formate set？What thing impact the setting？

pCaptureOutPrm->dataFormat          = SYSTEM_DF_YUV422I_YUYV;  // Is this video format that TVP5158 output  or others？？

（2）

vidDecVideoModeArgs[i].videoDataFormat    = SYSTEM_DF_YUV422P;  // What this means？TVP5158 Input？？

（3）deiPrm[i].setVipScYuv422Format                          = FALSE; // If I set this for true，does it means this？The Video passed DEI operation，its format become YUV422I（Y0U0Y1V0 Y2U2Y3V3 ....）.

If I set it for FALSE,what it means and what the video format？

（4）Capture（YUV422I）------>NSF（YUV420SP）------>DEI（YUV420）

The Video format changes from YUV422I to YUV422SP，then YUV420.First Question：I do not find the format change Configuration In NSF codes, How it become YUV420SP?

Second Question：What different between YUV420SP and YUV420 Here？

（5） ------>Merge------>Dup------>SW Mosaic（YUV422I）------>Display

The Video format changes from YUV420（In DEI） to YUV422I by SW Mosaic. I do not find the format change Configuration In SW Mosaic codes, How it become YUV422I? Could you give an explanation？

I am looking forward to your reply，thank you in advance.

JQ  Zhao