Re: [PATCH v4 3/4] gpu: ipu-v3: ipu-ic: Add support for BT.709 encoding

From: Philipp Zabel
Date: Tue Feb 12 2019 - 06:34:35 EST

Hi Steve,

On Mon, 2019-02-11 at 17:20 -0800, Steve Longerbeam wrote:
> > Should we support YUV BT.601 <-> YUV REC.709 conversions? That would
> > require separate encodings for input and output.
> How about if we pass the input and output encodings to the init ic task
> functions, but for now require they be the same? We can support
> transcoding in a later series.
> Again, I think for now, just include input/output quantization but
> require full range for RGB and limited range for YUV.

Yes, that is fine. I'd just like to avoid unnecessary interface changes
between ipu-v3 and imx-media. So if we have to change it right now, why
not plan ahead.

> But that really balloons the arguments to ipu_ic_task_init_*(). Should
> we create an ipu_ic_task_init structure?

I wonder if we should just expose struct ic_csc_params and provide a
helper to fill it given colorspace and V4L2 encoding/quantization
parameters. Something like:

struct ipu_ic_csc_params csc;

in_cs, in_encoding, in_quantization,
out_cs, out_encoding, out_quantization);

in_width, in_height,
out_width, out_height, &csc);
// or
ipu_ic_task_init_rsc(ic, rsc, &csc);