[libcamera-devel] [PATCH v6 3/6] libcamera: CameraSensorProperties: Add table of v4l2 index and test pattern

Laurent Pinchart laurent.pinchart at ideasonboard.com
Mon Jun 7 01:37:16 CEST 2021


Hi Hiro,

Thank you for the patch.

On Fri, May 28, 2021 at 12:05:28PM +0900, Hirokazu Honda wrote:
> The V4L2 specification defines the sensor test pattern modes
> through a menu control, where a numerical index is associated to
> a string that describes the test pattern. The index-to-pattern
> mapping is driver specific and requires a corresponding representation
> in the library.
> 
> Add to the static list of CameraSensorProperties a map of indexes to
> libcamera::controls::TestPatternModes values to be able to map the
> indexes returned by the driver to the corresponding test pattern mode.
> 
> Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
> ---
>  .../internal/camera_sensor_properties.h       |  2 ++
>  src/libcamera/camera_sensor_properties.cpp    | 32 +++++++++++++++++++
>  2 files changed, 34 insertions(+)
> 
> diff --git a/include/libcamera/internal/camera_sensor_properties.h b/include/libcamera/internal/camera_sensor_properties.h
> index f5e242cb..88ec7261 100644
> --- a/include/libcamera/internal/camera_sensor_properties.h
> +++ b/include/libcamera/internal/camera_sensor_properties.h
> @@ -7,6 +7,7 @@
>  #ifndef __LIBCAMERA_SENSOR_CAMERA_SENSOR_PROPERTIES_H__
>  #define __LIBCAMERA_SENSOR_CAMERA_SENSOR_PROPERTIES_H__
>  
> +#include <map>
>  #include <string>
>  
>  #include <libcamera/geometry.h>
> @@ -17,6 +18,7 @@ struct CameraSensorProperties {
>  	static const CameraSensorProperties *get(const std::string &sensor);
>  
>  	Size unitCellSize;
> +	std::map<uint8_t, uint8_t> testPatternModeMap;

I'd use int32_t for both, given that's the type of both the TestPattern
libcamera control and the V4L2 menu controls. The maps are small so it
won't consume much memory, and I wouldn't be surprised if uint8_t was
aligned to 32 bits anyway.

>  };
>  
>  } /* namespace libcamera */
> diff --git a/src/libcamera/camera_sensor_properties.cpp b/src/libcamera/camera_sensor_properties.cpp
> index 2a6e97f7..841564ff 100644
> --- a/src/libcamera/camera_sensor_properties.cpp
> +++ b/src/libcamera/camera_sensor_properties.cpp
> @@ -9,6 +9,8 @@
>  
>  #include <map>
>  
> +#include <libcamera/control_ids.h>
> +
>  #include "libcamera/internal/log.h"
>  
>  /**
> @@ -34,6 +36,11 @@ LOG_DEFINE_CATEGORY(CameraSensorProperties)
>   *
>   * \var CameraSensorProperties::unitCellSize
>   * \brief The physical size of a pixel, including pixel edges, in nanometers.
> + *
> + * \var CameraSensorProperties::testPatternModeMap

I'd name the field testPatternModes (or even testPatterns if you want to
shorten it), up to you.

> + * \brief Map that associates the indexes of the sensor test pattern modes as
> + * returned by V4L2_CID_TEST_PATTERN with the corresponding TestPattern
> + * control value
>   */
>  
>  /**
> @@ -47,15 +54,40 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
>  	static const std::map<std::string, const CameraSensorProperties> sensorProps = {
>  		{ "imx219", {
>  			.unitCellSize = { 1120, 1120 },
> +			.testPatternModeMap = {
> +				{ 0, controls::draft::TestPatternModeOff },
> +				{ 1, controls::draft::TestPatternModeColorBars },
> +				{ 2, controls::draft::TestPatternModeSolidColor },
> +				{ 3, controls::draft::TestPatternModeColorBarsFadeToGray },
> +				{ 4, controls::draft::TestPatternModePn9 },
> +			},
>  		} },
>  		{ "ov5670", {
>  			.unitCellSize = { 1120, 1120 },
> +			.testPatternModeMap = {
> +				{ 0, controls::draft::TestPatternModeOff },
> +				{ 1, controls::draft::TestPatternModeColorBars },
> +			},
>  		} },
>  		{ "ov13858", {
>  			.unitCellSize = { 1120, 1120 },
> +			.testPatternModeMap =  {
> +				{ 0, controls::draft::TestPatternModeOff },
> +				{ 1, controls::draft::TestPatternModeColorBars },
> +				{ 2, controls::draft::TestPatternModeColorBarsFadeToGray },

Does the OV13858 support the fade-to-grey pattern as described in patch
1/6 ? I'm looking at the OV13850 datasheet (I haven't found a leaked
version of the OV13858) and the fade-to-grey pattern doesn't have the
quantized right half of the colour bars.

> +			},
>  		} },
>  		{ "ov5693", {
>  			.unitCellSize = { 1400, 1400 },
> +			.testPatternModeMap = {
> +				{ 0, controls::draft::TestPatternModeOff },
> +				{ 2, controls::draft::TestPatternModeColorBars },
> +				/*
> +				 * No correspondence test pattern mode for

s/correspondence/corresponding/

> +				 * 1: "Random data" and 3: "Colour Bars with
> +				 * Rolling Bar".
> +				 */
> +			},
>  		} },
>  	};
>  

-- 
Regards,

Laurent Pinchart


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