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

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Message-ID: <CAL8zT=jNis3VN11xN82fci5dA5f0TwAAhkBVq2+5TaKpmm_S-Q@mail.gmail.com>
Date:	Mon, 15 Dec 2014 22:27:24 +0100
From:	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>
To:	Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:	Steve Longerbeam <slongerbeam@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Frédéric Sureau <frederic.sureau@...alys.com>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: i.MX6 CSC and scaler

2014-12-15 19:52 GMT+01:00 Nicolas Dufresne <nicolas.dufresne@...labora.com>:
>
>
> Le 12/15/2014 01:23 PM, Steve Longerbeam a écrit :
>> You would need to write a gstreamer plugin to make use of the
>> mem2mem device for h/w CSC and scaling.

Thank you Steve, this is of a great help !

> There is an element already (v4l2transform), though it currently only
> handle color conversion. I'd like to see scaling in that too instead of
> having a separate element that only do scaling like:
>
> https://bugzilla.gnome.org/show_bug.cgi?id=726104

Nice idea. You are probably right Nicolas, it would make sense to be
able to scale and convert color in the same element.

> I think Michael and Philipp idea was that scaling could be done directly
> out of the decoder, something supported by CODA driver. There is some
> work require to get that in GStreamer, see:
>
> https://bugzilla.gnome.org/show_bug.cgi?id=733827 (pixel format nego)
> https://bugzilla.gnome.org/show_bug.cgi?id=733828 (display size nego)

There is a need for a separate element too. So it could be handled in
front of the encoder if needed, on decoder output if needed, but
should be a single element too, instanciable multiple times if
multiple inputs/outputs are needed.

JM
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