linux-kernel - Re: [PATCH v4 0/6] media: v4l2: Add extended fmt and buffer ioctls

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Date:   Tue, 21 Jul 2020 10:56:25 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>,
        Brian.Starkey@....com
Cc:     mchehab@...nel.org, hans.verkuil@...co.com,
        laurent.pinchart@...asonboard.com, sakari.ailus@....fi,
        linux-media@...r.kernel.org, tfiga@...omium.org,
        hiroh@...omium.org, nicolas@...fresne.ca, kernel@...labora.com,
        narmstrong@...libre.com, linux-kernel@...r.kernel.org,
        frkoenig@...omium.org, mjourdan@...libre.com,
        stanimir.varbanov@...aro.org
Subject: Re: [PATCH v4 0/6] media: v4l2: Add extended fmt and buffer ioctls

Hi Boris,

On 7/21/20 8:15 AM, Boris Brezillon wrote:
> Hello Helen,
> 
> Just a few drive-by comments.
> 
> On Fri, 17 Jul 2020 08:54:29 -0300
> Helen Koike <helen.koike@...labora.com> wrote:
> 
>> Hi,
>>
>> I'm sorry for taking too long to submit v4.
>>
>> It is not perfect, not all v4l2-compliance tests passes, but I'd like a review,
>> specially on the API and potential problems, so I can focus on improving implementation
>> and maybe drop the RFC tag for next version.
>>
>> Follow below what changed in v4 and some items I'd like to discuss:
>>
>>
>> * Ioctl to replace v4l2_pix_format
>> ---------------------------------------------------------------------------------
>> During last media summit, we agreed to create ioctls that replace the v4l2_pix_format
>> struct and leave the other structs in the v4l2_format union alone.
>> Thus I refactored the code to receive struct v4l2_ext_pix_format, and I renamed the
>> ioctls, so now we have:
>>
>> int ioctl(int fd, VIDIOC_G_EXT_FMT, struct v4l2_ext_pix_format *argp);
> 
> Maybe use the EXT_PIX_FMT suffix here since the struct is really only
> about pixel formats.

Sorry, this is a copy&paste error, I'm already using this suffix in the code, except for the ioctls
that handle buffers (since they get v4l2_ext_buffer struct).

Regards,
Helen

> 
>> int ioctl(int fd, VIDIOC_S_EXT_FMT, struct v4l2_ext_pix_format *argp);
>> int ioctl(int fd, VIDIOC_TRY_EXT_FMT, struct v4l2_ext_pix_format *argp);
>>
>> The only valid types are V4L2_BUF_TYPE_VIDEO_CAPTURE and V4L2_BUF_TYPE_VIDEO_OUTPUT,
>> all the other types are invalid with this API.
>>
> 
> [...]
> 
>>
>>
>> Boris Brezillon (5):
>>   media: v4l2: Extend pixel formats to unify single/multi-planar
>>     handling (and more)
>>   media: videobuf2: Expose helpers to implement the _ext_fmt and
>>     _ext_buf hooks
>>   media: mediabus: Add helpers to convert a ext_pix format to/from a
>>     mbus_fmt
>>   media: vivid: Convert the capture and output drivers to
>>     EXT_FMT/EXT_BUF
>>   media: vimc: Implement the ext_fmt and ext_buf hooks
> 
> I think you should take ownership of these patches. The end result is
> likely to be completely different from what I initially posted, and
> you're the one doing the hard work here.
> 
>>
>> Hans Verkuil (1):
>>   media: v4l2: Add extended buffer operations
>>
>>  .../media/common/videobuf2/videobuf2-core.c   |   2 +
>>  .../media/common/videobuf2/videobuf2-v4l2.c   | 549 +++++-----
>>  .../media/test-drivers/vimc/vimc-capture.c    |  61 +-
>>  drivers/media/test-drivers/vimc/vimc-common.c |   6 +-
>>  drivers/media/test-drivers/vimc/vimc-common.h |   2 +-
>>  drivers/media/test-drivers/vivid/vivid-core.c |  70 +-
>>  .../test-drivers/vivid/vivid-touch-cap.c      |  26 +-
>>  .../test-drivers/vivid/vivid-touch-cap.h      |   3 +-
>>  .../media/test-drivers/vivid/vivid-vid-cap.c  | 169 +---
>>  .../media/test-drivers/vivid/vivid-vid-cap.h  |  15 +-
>>  .../media/test-drivers/vivid/vivid-vid-out.c  | 193 ++--
>>  .../media/test-drivers/vivid/vivid-vid-out.h  |  15 +-
>>  drivers/media/v4l2-core/v4l2-dev.c            |  50 +-
>>  drivers/media/v4l2-core/v4l2-ioctl.c          | 934 ++++++++++++++++--
>>  include/media/v4l2-ioctl.h                    |  60 ++
>>  include/media/v4l2-mediabus.h                 |  42 +
>>  include/media/videobuf2-core.h                |   6 +-
>>  include/media/videobuf2-v4l2.h                |  21 +-
>>  include/uapi/linux/videodev2.h                | 144 +++
>>  19 files changed, 1650 insertions(+), 718 deletions(-)
>>
>