linux-kernel - Re: [PATCH v4] media: uapi: v4l: Intel metadata format update

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Message-ID: <2eef3b075da7e91b938222a345e3f18f3765619f.camel@intel.com>
Date:   Fri, 02 Jun 2023 18:00:04 +0300
From:   Dmitry Perchanov <dmitry.perchanov@...el.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-media@...r.kernel.org, mchehab@...nel.org,
        linux-kernel@...r.kernel.org, sakari.ailus@...el.com,
        Evgeni Raikhel <evgeni.raikhel@...el.com>, demisrael@...il.com,
        Nir Azkiel <nir.azkiel@...el.com>
Subject: Re: [PATCH v4] media: uapi: v4l: Intel metadata format update

Hi Laurent,

Thanks for review!
I will gladly accept your proposed changes.

Comments inline.

On Fri, 2023-06-02 at 17:46 +0300, Laurent Pinchart wrote:
> Hi Dmitry,
> 
> Thank you for the patch.
> 
> On Thu, Jun 01, 2023 at 07:08:46PM +0300, Dmitry Perchanov wrote:
> > Update metadata structure for Intel RealSense UVC/MIPI cameras.
> > Compliant to Intel Configuration version 3.
> > 
> > Signed-off-by: Dmitry Perchanov <dmitry.perchanov@...el.com>
> > ---
> >  .../media/v4l/pixfmt-meta-d4xx.rst            | 52 ++++++++++++++++---
> >  1 file changed, 46 insertions(+), 6 deletions(-)
> > 
> > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-meta-d4xx.rst b/Documentation/userspace-api/media/v4l/pixfmt-meta-d4xx.rst
> > index 4e437ba97a0e..7482f298d0cc 100644
> > --- a/Documentation/userspace-api/media/v4l/pixfmt-meta-d4xx.rst
> > +++ b/Documentation/userspace-api/media/v4l/pixfmt-meta-d4xx.rst
> > @@ -12,7 +12,7 @@ Intel D4xx UVC Cameras Metadata
> >  Description
> >  ===========
> >  
> > -Intel D4xx (D435 and other) cameras include per-frame metadata in their UVC
> > +Intel D4xx (D435, D455 and others) cameras include per-frame metadata in their UVC
> >  payload headers, following the Microsoft(R) UVC extension proposal [1_]. That
> >  means, that the private D4XX metadata, following the standard UVC header, is
> >  organised in blocks. D4XX cameras implement several standard block types,
> > @@ -26,6 +26,8 @@ V4L2_META_FMT_UVC with the only difference, that it also includes proprietary
> >  payload header data. D4xx cameras use bulk transfers and only send one payload
> >  per frame, therefore their headers cannot be larger than 255 bytes.
> >  
> > +This document implements Intel Configuration version 3 [9_].
> > +
> >  Below are proprietary Microsoft style metadata types, used by D4xx cameras,
> >  where all fields are in little endian order:
> >  
> > @@ -43,7 +45,7 @@ where all fields are in little endian order:
> >      * - __u32 ID
> >        - 0x80000000
> >      * - __u32 Size
> > -      - Size in bytes (currently 56)
> > +      - Size in bytes, include ID (all protocol versions: 60)
> >      * - __u32 Version
> >        - Version of this structure. The documentation herein corresponds to
> >          version xxx. The version number will be incremented when new fields are
> 
> Should this read "version 3" instead of "version xxx" ?

This can read 1, 2 or 3, depends on firmware version.
All cameras have same firmware. The latest will report 3.
> 


> > @@ -72,13 +74,17 @@ where all fields are in little endian order:
> >        - Bottom border of the AE Region of Interest
> >      * - __u32 Preset
> >        - Preset selector value, default: 0, unless changed by the user
> > -    * - __u32 Laser mode
> > -      - 0: off, 1: on
> > +    * - __u8 Emitter mode (v3 only) (__u32 Laser mode for v1) [8_]
> > +      - 0: off, 1: on, same as __u32 Laser mode for v1
> > +    * - __u8 RFU byte (v3 only)
> > +      - Spare byte for future use
> > +    * - __u16 LED Power (v3 only)
> > +      - Led power value 0-360 (F416 SKU)
> >      * - :cspan:`1` *Capture Timing*
> >      * - __u32 ID
> >        - 0x80000001
> >      * - __u32 Size
> > -      - Size in bytes (currently 40)
> > +      - Size in bytes, include ID (all protocol versions: 40)
> >      * - __u32 Version
> >        - Version of this structure. The documentation herein corresponds to
> >          version xxx. The version number will be incremented when new fields are
> > @@ -101,7 +107,7 @@ where all fields are in little endian order:
> >      * - __u32 ID
> >        - 0x80000002
> >      * - __u32 Size
> > -      - Size in bytes (currently 40)
> > +      - Size in bytes, include ID (v1:36, v3:40)
> >      * - __u32 Version
> >        - Version of this structure. The documentation herein corresponds to
> >          version xxx. The version number will be incremented when new fields are
> > @@ -124,6 +130,14 @@ where all fields are in little endian order:
> >        - Requested frame rate per second
> >      * - __u16 Trigger
> >        - Byte 0: bit 0: depth and RGB are synchronised, bit 1: external trigger
> > +    * - __u16 Calibration count (v3 only)
> > +      - Calibration counter, see [4_] below
> > +    * - __u8 GPIO input data (v3 only)
> > +      - GPIO readout, see [4_] below (Supported from FW 5.12.7.0)
> > +    * - __u32 Sub-preset info (v3 only)
> > +      - Sub-preset choice information, see [4_] below
> > +    * - __u8 reserved (v3 only)
> > +      - RFU byte.
> >  
> >  .. _1:
> >  
> > @@ -140,6 +154,8 @@ where all fields are in little endian order:
> >    0x00000010 Exposure priority
> >    0x00000020 AE ROI
> >    0x00000040 Preset
> > +  0x00000080 Emitter mode
> > +  0x00000100 LED Power
> >  
> >  .. _3:
> >  
> > @@ -165,6 +181,8 @@ where all fields are in little endian order:
> >    0x00000040 Framerate
> >    0x00000080 Trigger
> >    0x00000100 Cal count
> > +  0x00000200 GPIO Input Data
> > +  0x00000400 Sub-preset Info
> >  
> >  .. _5:
> >  
> > @@ -211,3 +229,25 @@ Left sensor: ::
> >  Fish Eye sensor: ::
> >  
> >    1 RAW8
> > +
> > +.. _8:
> > +
> > +[8] The "Laser mode" is replaced by three different fields.
> 
> "... has been replaced in version 3 by ..."
> 
> > +"Laser" renamed to "Emitter" as there multiple technologies
> 
> s/there/there are/
Accepted. Thanks!

> 
> > +for camera projectors. As we have another field for "Laser Power"
> > +we introduced "LED Power" for extra emitter.
> > +
> > +The __u32 "Laser mode" integer is divided by two bytes and short: ::
> 
> The "Laser mode" __u32 field has been split into: ::
> 
> 
Accepted. Thanks!

> > +   1 __u8 Emitter mode
> > +   2 __u8 RFU byte
> > +   3 __u16 LED Power
> > +
> > +This is a change between versions 1 and 3. All versions 1,2 and 3
> 
> s/1,2/1, 2/
> 
Accepted. Thanks!

> > +are backward compatible with same data format and they are supported.
> > +See [2_] for which attributes are valid.
> > +
> > +.. _9:
> > +
> > +[9]
> > +LibRealSense SDK metadata source:
> 
> I'll remove the blank line after '[9]', that is
> 
> > +[9] LibRealSense SDK metadata source:
> 
Accepted. Thanks!

> I can fix all this when applying if you're fine with the changes.
> 
Yes, I agree. Thank You for your effort!
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> > +https://github.com/IntelRealSense/librealsense/blob/master/src/metadata.h

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