[libcamera-devel] [PATCH v4 1/3] libcamera: Introduce camera sensor database
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Tue Apr 13 03:44:13 CEST 2021
Hi Jacopo,
Thank you for the patch.
On Mon, Apr 12, 2021 at 10:07:17PM +0900, Hirokazu Honda wrote:
> On Mon, Apr 12, 2021 at 6:10 PM Niklas Söderlund wrote:
> > On 2021-04-12 09:57:00 +0200, Jacopo Mondi wrote:
> > > Introduce a 'database' of camera sensor information, which contains
> > > a the camera sensor properties which is not possible, or desirable,
s/is not/are not/
> > s/^a //
> >
> > > to retrieve at run-time.
> > >
> > > The camera sensor database is accessed through the static SensorDatabase
> > > class which provides a single method to obtain the sensor information.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
> >
> > Reviewed-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
> >
> > > ---
> > > include/libcamera/internal/meson.build | 1 +
> > > include/libcamera/internal/sensor_database.h | 28 ++++++
> > > src/libcamera/meson.build | 1 +
> > > src/libcamera/sensor_database.cpp | 97 ++++++++++++++++++++
> > > 4 files changed, 127 insertions(+)
> > > create mode 100644 include/libcamera/internal/sensor_database.h
> > > create mode 100644 src/libcamera/sensor_database.cpp
> > >
> > > diff --git a/include/libcamera/internal/meson.build b/include/libcamera/internal/meson.build
> > > index 1fe3918cfe93..4aaa76ac1db1 100644
> > > --- a/include/libcamera/internal/meson.build
> > > +++ b/include/libcamera/internal/meson.build
> > > @@ -38,6 +38,7 @@ libcamera_internal_headers = files([
> > > 'process.h',
> > > 'pub_key.h',
> > > 'semaphore.h',
> > > + 'sensor_database.h',
> > > 'sysfs.h',
> > > 'thread.h',
> > > 'timer.h',
> > > diff --git a/include/libcamera/internal/sensor_database.h b/include/libcamera/internal/sensor_database.h
> > > new file mode 100644
> > > index 000000000000..7d743e46102d
> > > --- /dev/null
> > > +++ b/include/libcamera/internal/sensor_database.h
> > > @@ -0,0 +1,28 @@
> > > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > > +/*
> > > + * Copyright (C) 2021, Google Inc.
> > > + *
> > > + * sensor_database.h - Database of camera sensor properties
> > > + */
> > > +#ifndef __LIBCAMERA_SENSOR_DATABASE_H__
> > > +#define __LIBCAMERA_SENSOR_DATABASE_H__
> > > +
> > > +#include <string>
> > > +
> > > +#include <libcamera/geometry.h>
> > > +
> > > +namespace libcamera {
> > > +
> > > +struct SensorInfo {
I'd name this CameraSensorInfo, as we may have to support other types of
sensor in the future.
> > > + Size unitCellSize;
> > > +};
> > > +
> > > +class SensorDatabase
> > > +{
> > > +public:
> > > + static const SensorInfo *get(const std::string &sensor);
> > > +};
> > > +
>
> Just FYI: https://google.github.io/styleguide/cppguide.html#Nonmember,_Static_Member,_and_Global_Functions
> > Do not create classes only to group static members; this is no different than just giving the names a common prefix, and such grouping is usually unnecessary anyway.
>
> However, I am not against this code. I am personally fine with class +
> static member functions.
Moving the static function to the SensorInfo class would solve this
problem.
> > > +} /* namespace libcamera */
> > > +
> > > +#endif /* __LIBCAMERA_SENSOR_DATABASE_H__ */
> > > diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
> > > index e0a48aa23ea5..effae0ef5186 100644
> > > --- a/src/libcamera/meson.build
> > > +++ b/src/libcamera/meson.build
> > > @@ -44,6 +44,7 @@ libcamera_sources = files([
> > > 'pub_key.cpp',
> > > 'request.cpp',
> > > 'semaphore.cpp',
> > > + 'sensor_database.cpp',
> > > 'signal.cpp',
> > > 'stream.cpp',
> > > 'sysfs.cpp',
> > > diff --git a/src/libcamera/sensor_database.cpp b/src/libcamera/sensor_database.cpp
> > > new file mode 100644
> > > index 000000000000..68e69e8bf1b6
> > > --- /dev/null
> > > +++ b/src/libcamera/sensor_database.cpp
> > > @@ -0,0 +1,97 @@
> > > +/* SPDX-License-Identifier: LGPL-2.1-or-later */
> > > +/*
> > > + * Copyright (C) 2021, Google Inc.
> > > + *
> > > + * sensor_database.cpp - Database of camera sensor properties
> > > + */
> > > +
> > > +#include "libcamera/internal/sensor_database.h"
> > > +
> > > +#include <algorithm>
> > > +
> > > +namespace libcamera {
The namespace goes after \file.
> > > +
> > > +/**
> > > + * \file sensor_database.h
> > > + * \brief Database of camera sensor properties
> > > + *
> > > + * The camera sensor database collects information on camera sensors
s/information on/static information about/
> > > + * which is not possible or desirable to retrieve at run-time.
s/which/that/
s/run-time/run time/
> > > + */
> > > +
> > > +/**
> > > + * \class SensorDatabase
> > > + * \brief Access the database of camera sensor properties
> > > + *
> > > + * The database is indexed using the camera sensor model, as reported by the
> > > + * properties::Model property, and for each supported sensor it contains a
> > > + * SensorInfo list of properties.
> > > + *
> > > + * The class provides a single static getInfo() method to access the sensor
The function is called get(). But in any case, let's move it to the
SensorInfo class.
> > > + * database entries. If the sensor is not supported in the database nullptr is
> > > + * returned.
> > > + */
> > > +
> > > +/**
> > > + * \struct SensorInfo
> > > + * \brief List of sensor properties
> > > + *
> > > + * \var SensorInfo::unitCellSize
> > > + * \brief The physical size of pixel, including pixel edges. Width x height in
s/pixel/a pixel/
> > > + * nano-meters.
s/nano-meters/nanometers/
This field is a Size, so no need to repeat Width x height.
* \brief The physical size of a pixel, including pixel edges, in nanometers
> > > + */
> > > +
> > > +namespace {
> > > +
> > > +/**
> > > + * \brief Sony IMX219 sensor properties
> > > + */
> > > +constexpr SensorInfo imx219Info = {
> > > + .unitCellSize = { 1120, 1120 }
> > > +};
> > > +
> > > +/**
> > > + * \brief Omnivision ov5670 sensor properties
> > > + */
> > > +constexpr SensorInfo ov5670Info = {
> > > + .unitCellSize = { 1120, 1120 }
> > > +};
> > > +
> > > +/**
> > > + * \brief Omnivision 13858 sensor properties
> > > + */
> > > +constexpr SensorInfo ov13858Info = {
> > > + .unitCellSize = { 1120, 1120 }
> > > +};
> > > +
> > > +#define SENSOR_INFO(_sensor) \
> > > + { #_sensor, &_sensor##Info }
> > > +
> > > +/*
> > > + * \brief The database of sensor properties
> > > + */
> > > +constexpr std::pair<const char *const, const SensorInfo *> sensorDatabase__[] = {
> > > + SENSOR_INFO(imx219),
> > > + SENSOR_INFO(ov5670),
> > > + SENSOR_INFO(ov13858),
> > > +};
> > > +
> > > +} /* namespace */
> > > +
> > > +/**
> > > + * \brief Retrieve the properties associated with a sensor
> > > + * \param sensor The sensor model name
> > > + * \return A pointer to the SensorInfo instance associated with a sensor or
> > > + * nullptr if the sensor is not supported in the database
> > > + */
> > > +const SensorInfo *SensorDatabase::get(const std::string &sensor)
> > > +{
> > > + for (unsigned int i = 0; i < std::size(sensorDatabase__); ++i) {
> > > + if (sensorDatabase__[i].first == sensor)
> > > + return sensorDatabase__[i].second;
> > > + }
Why not std::map ?
namespace {
const std::map<std::string, SensorInfo> sensorDatabase{
{ "imx219", {
.unitCellSize = { 1120, 1120 },
} },
...
};
} /* namespace */
and this function can become
const CameraSensorInfo *CameraSensorInfo::get(const std::string &sensor)
{
auto iter = sensorDatabase.find(sensor);
if (iter == sensorDatabase.end())
return nullptr;
return *iter;
}
> > > +
> > > + return nullptr;
> > > +}
> > > +
> > > +} /* namespace libcamera */
>
> Reviewed-by: Hirokazu Honda <hiroh at chromium.org>
--
Regards,
Laurent Pinchart
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