topic Re: How to use IPU to resize camera raw data in kernel space? in i.MX Processors

How to use IPU to resize camera raw data in kernel space?

zoe_chen — Wed, 28 Oct 2015 06:57:25 GMT

Hi All,

I have used ipu resize camera data from 1280*720 to 720*480, now I want to do it in kernel space.

My platform is i.MX6 , the camera sensor can only output 1280*720 raw data, but my applicantion need 720 × 480, So I use IPU to resize it after DQBUF. Then I find in mxc_v4l2_capture.c，Freescale Code will use IPU to convert our camera buffer, so I think whether I can resize my camera data in this layer. It can improve the efficiency.

I have try to change ipu_csi_set_window_size, ipu_csi_set_window_pos, ipu_csi_init_interface parm in mxc_v4l2_s_param. But the effect is only crop not resize.

Re: How to use IPU to resize camera raw data in kernel space?

igorpadykov — Fri, 30 Oct 2015 03:56:02 GMT

Hi zoe

in general one can try to use g2d for resizing, please refer to

attached Linux Guide sect.7.5.3 Video conversion

Best regards

igor

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Re: How to use IPU to resize camera raw data in kernel space?

zoe_chen — Fri, 30 Oct 2015 04:37:47 GMT

Hi igor,

Does g2d can output YUV format ? In "G2D API User Guide", it says

"RGB and YUV formats can be set in source surface, but only RGB format can be

set in destination surface". So I did not use g2d to resize a yuv buffer.

BR,

Zoe

Re: How to use IPU to resize camera raw data in kernel space?

saurabh206 — Fri, 30 Oct 2015 04:50:22 GMT

Hi Zoe,

G2D can only output in RGB format.