linux-kernel - Re: [PATCH v3 1/2] media: uapi: Add H264 low-level decoder API compound controls.

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Message-ID: <20190212102324.3tdurso54fumlkwr@flea>
Date:   Tue, 12 Feb 2019 11:23:24 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     nicolas.dufresne@...labora.com, tfiga@...omium.org,
        posciak@...omium.org, hans.verkuil@...co.com,
        acourbot@...omium.org, sakari.ailus@...ux.intel.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        jenskuske@...il.com, jernej.skrabec@...il.com, jonas@...boo.se,
        linux-sunxi@...glegroups.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH v3 1/2] media: uapi: Add H264 low-level decoder API
 compound controls.

On Mon, Feb 11, 2019 at 02:12:25PM -0300, Ezequiel Garcia wrote:
> On Mon, 2019-02-11 at 15:39 +0100, Maxime Ripard wrote:
> > 
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index d6eed479c3a6..6fc955926bdb 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -645,6 +645,7 @@ struct v4l2_pix_format {
> >  #define V4L2_PIX_FMT_H264     v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
> >  #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
> >  #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> > +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
> 
> Nicolas and I have discussed the pixel format, and came up with
> the following proposal.
> 
> Given this format represents H264 parsed slices, without any start code,
> perhpaps we name it as:
> 
> V4L2_PIX_FMT_H264_SLICE_RAW
> 
> Then, we'd also add:
> 
> V4L2_PIX_FMT_H264_SLICE_ANNEX_B
> 
> To represent H264 parsed slices with annex B (3- or 4-byte) start code.
> This one is what the Rockchip VPU driver would expose.
> 
> Ideas?

I think we discussed that idea already, and I'm all for it.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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