TDA4VM: TDA4

Aleksandar Kecman

Part Number: TDA4VM

Hi experts,

i have question about CSITX node. Is there any possibilities to send YUV420(NV12) format video with CSITX node. I have found that supported formats are VX_DF_IMAGE_RGBX, VX_DF_IMAGE_U16, VX_DF_IMAGE_UYVY or VX_DF_IMAGE_YUYV, but what i have to do to send YUV420 format.

over 3 years ago

0 Nikhil Dasan over 3 years ago

TI__Guru* 85176 points

Hi,

Yes, The CSITX node does not support NV12 format.

Could you tell me where you are generating the NV12 image from?

Regards
Nikhil

0 Aleksandar Kecman over 3 years ago in reply to Nikhil Dasan

Prodigy 125 points

Hi,

We get NV12 video from camera.

Regards,

Aleksandar

0 Nikhil Dasan over 3 years ago in reply to Aleksandar Kecman

TI__Guru* 85176 points

Hi Aleksander,

The main issue is, NV12 format in MIPI is kind of interleaved format, odd lines with luma only data and even lines with interleaved luma and chroma. CSIRX directly writes this data into memory and this is not supported by any other modules, without converting it into semi-planar format.

Does the camera support yuv422?

Regards,

Nikhil

0 Aleksandar Kecman over 3 years ago in reply to Nikhil Dasan

Prodigy 125 points

Hi Nikhil,

thank you for fast answer.

Camera supports only raw format, but we use VISS module to convert it to the NV12.

Can VISS be configured to convert it to some CSITX supported format?

Regards,

Aleksandar

+1 Nikhil Dasan over 3 years ago in reply to Aleksandar Kecman

TI__Guru* 85176 points

Hi Aleksander,

If the NV12 is from the VISS module, then you could use a color convert node (i.e. vxColorConvertNode) prior to CSI-TX node, where input to the color convert node is NV12 and output from the node could be VX_DF_IMAGE_RGBX, VX_DF_IMAGE_UYVY or VX_DF_IMAGE_YUYVRegards,
Nikhil

0 Aleksandar Kecman over 3 years ago in reply to Nikhil Dasan

Prodigy 125 points

Hi Nikhil,

So, other output formats from VISS module are not supported?

Regards,

Aleksandar

0 Nikhil Dasan over 3 years ago in reply to Aleksandar Kecman

TI__Guru* 85176 points

Hi Aleksander,

Sorry, you could make the VISS module itself to output YUV422 as the viss node supports the output formats VX_DF_IMAGE_UYVY, VX_DF_IMAGE_YUYV.
In this case, there is no need of the color convert node

Regards,
Nikhil

0 Aleksandar Kecman over 3 years ago in reply to Nikhil Dasan

Prodigy 125 points

Hi Nikhil,

Can you tell me where to configure that frame format. Do you have some documentation or usage example?

Regards,

Aleksandar.

0 Nikhil Dasan over 3 years ago in reply to Aleksandar Kecman

TI__Guru* 85176 points

Hi Aleksandar,

You could make below changes in your current code in order to configure VISS to output YUV422...

1. Create an vx_image of the type VX_DF_IMAGE_UYVY or VX_DF_IMAGE_YUYV.

image = vxCreateImage(context, width, height, VX_DF_IMAGE_YUYV);

2. Change the mux2 value of tivx_vpac_viss_fcp_params_t::mux_output2 to "5"

  params.fcp[0].mux_output2 = arg_->mux2; (where params is of the type "tivx_vpac_viss_params_t")

3. Change chroma_mode to '1'.

  params.fcp[0].chroma_mode = 1;

4. Place this image at output 2 of the viss node

  node = tivxVpacVissNode(graph, configuration, ae_awb_result, NULL, raw, NULL, NULL, y8_r8_c2, NULL, NULL, NULL, NULL, NULL, NULL);

Regards,
Nikhil

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