linux-kernel - Re: i.MX6 CSC and scaler

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Message-ID: <548F272E.3040808@gmail.com>
Date:	Mon, 15 Dec 2014 10:23:42 -0800
From:	Steve Longerbeam <slongerbeam@...il.com>
To:	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Frédéric Sureau <frederic.sureau@...alys.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>
Subject: Re: i.MX6 CSC and scaler

On 12/15/2014 09:03 AM, Jean-Michel Hautbois wrote:
> Hi Steve, Philipp,
>
> I see in the kernel sources you created a ipu-ic.c file which helps
> working with the Color Space Converter on i.MX6.
> We would like to use it on our board with GStreamer, as the conversion
> done by the CPU is not very efficient :).
> What is the easiest/best approach to this ?
> Should we create a video device using a new driver, which would be
> instanciated as a /dev/videoX and see as a transform element in
> GStreamer ?
> The idea is to have a separate element, ideally without memory copy or
> anything like that.

Hi JM,

I've written a mem2mem driver for this. It does tiling to support
> 1024x1024 scaled output frames. I've attached it, feel free to use
it, it was pulled from a 3.14 kernel. I haven't submitted this driver to
community yet, mostly because I want to improve it, most importantly
move the tiling support into ipu-ic, so that tiling could eventually be used by
any media-device enabled pipeline elements (instead of only mem2mem).
Also Philipp probably also has a mem2mem device as well.

You would need to write a gstreamer plugin to make use of the
mem2mem device for h/w CSC and scaling.

Steve


View attachment "mx6-m2m.c" of type "text/x-csrc" (49847 bytes)