linux-kernel - Re: [PATCH v2 3/9] media: Rename stateful codec control macros

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Date:   Sat, 14 Nov 2020 22:12:25 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kernel@...labora.com, Jonas Karlman <jonas@...boo.se>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Maxime Ripard <mripard@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH v2 3/9] media: Rename stateful codec control macros

On Sat, 2020-11-14 at 13:53 +0100, Hans Verkuil wrote:
> On 13/11/2020 22:51, Ezequiel Garcia wrote:
> > For historical reasons, stateful codec controls are named
> > as {}_MPEG_{}. While we can't at this point sanely
> > change all control IDs (such as V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER),
> > we can least change the more meaningful macros such as classes
> > macros.
> > 
> > Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> > ---
> >  .../userspace-api/media/v4l/dev-mem2mem.rst   |   2 +-
> >  .../media/v4l/ext-ctrls-codec.rst             |   4 +-
> >  .../media/v4l/extended-controls.rst           |   8 +-
> >  .../media/v4l/vidioc-g-ext-ctrls.rst          |   6 +-
> >  drivers/media/common/cx2341x.c                |   4 +-
> >  drivers/media/platform/s5p-mfc/s5p_mfc_dec.c  |   2 +-
> >  drivers/media/platform/s5p-mfc/s5p_mfc_enc.c  |   2 +-
> >  drivers/media/v4l2-core/v4l2-ctrls.c          |   4 +-
> >  include/media/fwht-ctrls.h                    |   2 +-
> >  include/media/h264-ctrls.h                    |  16 +-
> >  include/media/hevc-ctrls.h                    |  10 +-
> >  include/media/mpeg2-ctrls.h                   |   4 +-
> >  include/media/vp8-ctrls.h                     |   2 +-
> >  include/uapi/linux/v4l2-controls.h            | 409 +++++++++---------
> >  14 files changed, 242 insertions(+), 233 deletions(-)
> > 
> 
> <snip>
> 
> > @@ -1177,4 +1177,13 @@ enum v4l2_detect_md_mode {
> >  #define V4L2_CID_DETECT_MD_THRESHOLD_GRID	(V4L2_CID_DETECT_CLASS_BASE + 3)
> >  #define V4L2_CID_DETECT_MD_REGION_GRID		(V4L2_CID_DETECT_CLASS_BASE + 4)
> >  
> > +/* MPEG-compression definitions kept for backwards compatibility */
> > +#ifndef __KERNEL__
> > +#define V4L2_CTRL_CLASS_MPEG            V4L2_CTRL_CLASS_CODEC
> > +#define V4L2_CID_MPEG_CLASS             (V4L2_CTRL_CLASS_MPEG | 1)
> > +#define V4L2_CID_MPEG_BASE              (V4L2_CTRL_CLASS_MPEG | 0x900)
> > +#define V4L2_CID_MPEG_CX2341X_BASE	(V4L2_CTRL_CLASS_MPEG | 0x1000)
> > +#define V4L2_CID_MPEG_MFC51_BASE	(V4L2_CTRL_CLASS_MPEG | 0x1100)
> 
> Don't copy the offset value here, just keep this as a straight aliases, e.g.:
> 
> #define V4L2_CID_MPEG_MFC51_BASE	V4L2_CID_CODEC_MFC51_BASE
> 
> It's safer that way.
> 

Yes, indeed.

Thanks,
Ezequiel