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PROCESSOR-SDK-DRA8X-TDA4X: YUYV422 to YUV420SP conversion

Kumar Anshuman
Expert 1090 points

Part Number: PROCESSOR-SDK-DRA8X-TDA4X

Hi,

I want to convert the YUYV422 image coming from camera to YUV420SP (NV12) format. Is it possible through VPAC module ?

We observed that LDC has following option:

Our aim is only to do the format conversion and nothing else.

Please suggest what to do. 

  • 0
    TI__Guru 59820 points

    Hi Anshuman,

    Yes, LDC can convert from 422 to NV12.

    Please refer to section "1.5.3.11 LDC YUV422 to YUV420 Conversion" in TRM.

    You shall set register field VPAC_LDC_CTRL.OP_DATAMODE to 1 to turn on 422 to 420 conversion.

    Best,

    Gang

  • 0 in reply to Gang Hua
    Expert 1090 points

    Hi Gang,

    IN the LDC Node there are multiple parameters,

    VX_API_ENTRY vx_node VX_API_CALL tivxVpacLdcNode(vx_graph graph,
                                      vx_user_data_object  configuration,
                                      vx_matrix            warp_matrix,
                                      vx_user_data_object  region_prms,
                                      vx_user_data_object  mesh_prms,
                                      vx_image             mesh_img,
                                      vx_user_data_object  dcc_db,
                                      vx_image             in_img,
                                      vx_image             out0_img,
                                      vx_image             out1_img)

    Since, my purpose is only to convert the YUV422 toYUV420SP, i will only set the image formats. 

    Can i set all the other parameters to NULL, to fulfil my objective.?

    One more thing, where can i set the register field VPAC_LDC_CTRL.OP_DATAMODE to 1 to turn on 422 to 420 conversion in the SDK. I am unable to find the same.

  • 0 in reply to Kumar Anshuman
    TI__Guru 59820 points

    Hi Anshuman,

    The conversion is supported by CSL driver in "csl_ldc.c".

            /* Enable YUV422 to YUV420 conversion */
        if ((cfg->inFmt.dataFormat == FVID2_DF_YUV422I_UYVY) &&
            (cfg->outFmt[0].dataFormat == FVID2_DF_YUV420SP_UV))
        {
            CSL_REG32_FINS(&coreRegs->CTRL, LDC_CORE_CTRL_OP_DATAMODE, 1u);
        }
        else
        {
            CSL_REG32_FINS(&coreRegs->CTRL, LDC_CORE_CTRL_OP_DATAMODE, 0u);
        }

    I suppose setting the image formats properly shall work for you.
    Of course, you will need to set the image size correctly.

    You may refer to "vx_vpac_ldc_target.c" if you have any issues in configuring LDC.
    The "create" function there sets many LDC parameters to default values if you provide NULL as input.

    Best,

    Gang