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DM6467 raw video input

Nir Aloni
Expert 1240 points

Can DM6467 raw video input accept/capture 12-bit YCbCr 4:2:2 video format?

  • 0
    TI__Mastermind 37340 points

    Yes, this is possible.  In RAW capture mode (up to 12-bit input), it can capture whatever data is present at video input interface to SDRAM

  • 0 in reply to Juan Gonzales
    Expert 1240 points

    As I understood from spruer9c document about the VPIF, when RAW mode is used, every pixel clock the VPIF captures the pixel data (12-bit in my case) that is incident on its input port (r0 - r11) and copies it to SDRAM regardless if it is luminance data or chrominance data. So, if I want to capture this 12-bit YCrCb data, color convert it to 4:2:0 and send it to the h.264 BP encoder, I cannot do it until I re-arrange the luminance and chrominance data to be in the form the color conversion engine expects (As opposed to BT.1120 and BT.656 where luminance and chrominance data are saved in SDRAM in the expected form). Am I correct?

    By the way, I did not see any register that sets the VPIF in RAW/BT.656/BT.1120 mode. How the VPIF knows what mode is active?

  • 0 in reply to Nir Aloni
    TI__Mastermind 37340 points

    Nir Aloni said:

    As I understood from spruer9c document about the VPIF, when RAW mode is used, every pixel clock the VPIF captures the pixel data (12-bit in my case) that is incident on its input port (r0 - r11) and copies it to SDRAM regardless if it is luminance data or chrominance data. So, if I want to capture this 12-bit YCrCb data, color convert it to 4:2:0 and send it to the h.264 BP encoder, I cannot do it until I re-arrange the luminance and chrominance data to be in the form the color conversion engine expects (As opposed to BT.1120 and BT.656 where luminance and chrominance data are saved in SDRAM in the expected form). Am I correct?

    correct.

    Nir Aloni said:

    By the way, I did not see any register that sets the VPIF in RAW/BT.656/BT.1120 mode. How the VPIF knows what mode is active?

    The mode is selected via CH0_CTRL:CH0_FORMAT register fields (similarly for other channels, e.g. CH1_CTRL register).  This lets you select between BT and RAW modes; once you are in a BT mode, the SAV and EAV codes will differentiate between BT.656 or BT.1120.