[libcamera-devel] [PATCH v4 02/13] libcamera: v4l2_device: Add method to retrieve all supported controls

Niklas Söderlund niklas.soderlund at ragnatech.se
Tue Jul 2 01:42:33 CEST 2019


Hi Laurent,

Thanks for your work.

On 2019-07-01 23:14:53 +0300, Laurent Pinchart wrote:
> Add a new controls() method to the V4L2Device class to retrieve the map
> of all supported controls. This is needed in order to dynamically query
> the supported controls, for instance for drivers that support different
> sets of controls depending on the device model.
> 
> To make the API easier to use, create a type alias for the control ID to
> ControlInfo and use it.
> 
> Remove the getControlInfo() method that is not used externally, as it
> can now be replaced by accessing the full list of controls.
> 
> Update the CameraSensor API accordingly.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
> Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>

Reviewed-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>

> ---
>  src/libcamera/camera_sensor.cpp       | 10 ++++------
>  src/libcamera/include/camera_sensor.h |  5 ++---
>  src/libcamera/include/v4l2_controls.h |  6 ++++--
>  src/libcamera/include/v4l2_device.h   |  9 ++++-----
>  src/libcamera/v4l2_controls.cpp       |  5 +++++
>  src/libcamera/v4l2_device.cpp         | 25 +++++++++----------------
>  6 files changed, 28 insertions(+), 32 deletions(-)
> 
> diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
> index 471c3e2e6e47..a7670b449b31 100644
> --- a/src/libcamera/camera_sensor.cpp
> +++ b/src/libcamera/camera_sensor.cpp
> @@ -248,14 +248,12 @@ int CameraSensor::setFormat(V4L2SubdeviceFormat *format)
>  }
>  
>  /**
> - * \brief Retrieve information about a control
> - * \param[in] id The control ID
> - * \return A pointer to the V4L2ControlInfo for control \a id, or nullptr
> - * if the sensor doesn't have such a control
> + * \brief Retrieve the supported V4L2 controls and their information
> + * \return A map of the V4L2 controls supported by the sensor
>   */
> -const V4L2ControlInfo *CameraSensor::getControlInfo(unsigned int id) const
> +const V4L2ControlInfoMap &CameraSensor::controls() const
>  {
> -	return subdev_->getControlInfo(id);
> +	return subdev_->controls();
>  }
>  
>  /**
> diff --git a/src/libcamera/include/camera_sensor.h b/src/libcamera/include/camera_sensor.h
> index b42e7b8e1343..fe033fb374c1 100644
> --- a/src/libcamera/include/camera_sensor.h
> +++ b/src/libcamera/include/camera_sensor.h
> @@ -13,12 +13,11 @@
>  #include <libcamera/geometry.h>
>  
>  #include "log.h"
> +#include "v4l2_controls.h"
>  
>  namespace libcamera {
>  
>  class MediaEntity;
> -class V4L2ControlInfo;
> -class V4L2ControlList;
>  class V4L2Subdevice;
>  
>  struct V4L2SubdeviceFormat;
> @@ -43,7 +42,7 @@ public:
>  				      const Size &size) const;
>  	int setFormat(V4L2SubdeviceFormat *format);
>  
> -	const V4L2ControlInfo *getControlInfo(unsigned int id) const;
> +	const V4L2ControlInfoMap &controls() const;
>  	int getControls(V4L2ControlList *ctrls);
>  	int setControls(V4L2ControlList *ctrls);
>  
> diff --git a/src/libcamera/include/v4l2_controls.h b/src/libcamera/include/v4l2_controls.h
> index 0047efab11fa..10b726504951 100644
> --- a/src/libcamera/include/v4l2_controls.h
> +++ b/src/libcamera/include/v4l2_controls.h
> @@ -8,11 +8,11 @@
>  #ifndef __LIBCAMERA_V4L2_CONTROLS_H__
>  #define __LIBCAMERA_V4L2_CONTROLS_H__
>  
> +#include <map>
> +#include <stdint.h>
>  #include <string>
>  #include <vector>
>  
> -#include <stdint.h>
> -
>  #include <linux/v4l2-controls.h>
>  #include <linux/videodev2.h>
>  
> @@ -41,6 +41,8 @@ private:
>  	int64_t max_;
>  };
>  
> +using V4L2ControlInfoMap = std::map<unsigned int, V4L2ControlInfo>;
> +
>  class V4L2Control
>  {
>  public:
> diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h
> index 24a0134a2cba..e7e9829cb05f 100644
> --- a/src/libcamera/include/v4l2_device.h
> +++ b/src/libcamera/include/v4l2_device.h
> @@ -13,19 +13,18 @@
>  #include <linux/videodev2.h>
>  
>  #include "log.h"
> +#include "v4l2_controls.h"
>  
>  namespace libcamera {
>  
> -class V4L2ControlInfo;
> -class V4L2ControlList;
> -
>  class V4L2Device : protected Loggable
>  {
>  public:
>  	void close();
>  	bool isOpen() const { return fd_ != -1; }
>  
> -	const V4L2ControlInfo *getControlInfo(unsigned int id) const;
> +	const V4L2ControlInfoMap &controls() const { return controls_; }
> +
>  	int getControls(V4L2ControlList *ctrls);
>  	int setControls(V4L2ControlList *ctrls);
>  
> @@ -48,7 +47,7 @@ private:
>  			    const struct v4l2_ext_control *v4l2Ctrls,
>  			    unsigned int count);
>  
> -	std::map<unsigned int, V4L2ControlInfo> controls_;
> +	V4L2ControlInfoMap controls_;
>  	std::string deviceNode_;
>  	int fd_;
>  };
> diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp
> index af017bce48ba..84258d9954d0 100644
> --- a/src/libcamera/v4l2_controls.cpp
> +++ b/src/libcamera/v4l2_controls.cpp
> @@ -114,6 +114,11 @@ V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl)
>   * \return The V4L2 control maximum value
>   */
>  
> +/**
> + * \typedef V4L2ControlInfoMap
> + * \brief A map of control ID to V4L2ControlInfo
> + */
> +
>  /**
>   * \class V4L2Control
>   * \brief A V4L2 control value
> diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
> index 06939dead705..e3ec44a7f156 100644
> --- a/src/libcamera/v4l2_device.cpp
> +++ b/src/libcamera/v4l2_device.cpp
> @@ -111,19 +111,10 @@ void V4L2Device::close()
>   */
>  
>  /**
> - * \brief Retrieve information about a control
> - * \param[in] id The control ID
> - * \return A pointer to the V4L2ControlInfo for control \a id, or nullptr
> - * if the device doesn't have such a control
> + * \fn V4L2Device::controls()
> + * \brief Retrieve the supported V4L2 controls and their information
> + * \return A map of the V4L2 controls supported by the device
>   */
> -const V4L2ControlInfo *V4L2Device::getControlInfo(unsigned int id) const
> -{
> -	auto it = controls_.find(id);
> -	if (it == controls_.end())
> -		return nullptr;
> -
> -	return &it->second;
> -}
>  
>  /**
>   * \brief Read controls from the device
> @@ -158,13 +149,14 @@ int V4L2Device::getControls(V4L2ControlList *ctrls)
>  
>  	for (unsigned int i = 0; i < count; ++i) {
>  		const V4L2Control *ctrl = ctrls->getByIndex(i);
> -		const V4L2ControlInfo *info = getControlInfo(ctrl->id());
> -		if (!info) {
> +		const auto iter = controls_.find(ctrl->id());
> +		if (iter == controls_.end()) {
>  			LOG(V4L2, Error)
>  				<< "Control '" << ctrl->id() << "' not found";
>  			return -EINVAL;
>  		}
>  
> +		const V4L2ControlInfo *info = &iter->second;
>  		controlInfo[i] = info;
>  		v4l2Ctrls[i].id = info->id();
>  	}
> @@ -232,13 +224,14 @@ int V4L2Device::setControls(V4L2ControlList *ctrls)
>  
>  	for (unsigned int i = 0; i < count; ++i) {
>  		const V4L2Control *ctrl = ctrls->getByIndex(i);
> -		const V4L2ControlInfo *info = getControlInfo(ctrl->id());
> -		if (!info) {
> +		const auto iter = controls_.find(ctrl->id());
> +		if (iter == controls_.end()) {
>  			LOG(V4L2, Error)
>  				<< "Control '" << ctrl->id() << "' not found";
>  			return -EINVAL;
>  		}
>  
> +		const V4L2ControlInfo *info = &iter->second;
>  		controlInfo[i] = info;
>  		v4l2Ctrls[i].id = info->id();
>  
> -- 
> Regards,
> 
> Laurent Pinchart
> 
> _______________________________________________
> libcamera-devel mailing list
> libcamera-devel at lists.libcamera.org
> https://lists.libcamera.org/listinfo/libcamera-devel

-- 
Regards,
Niklas Söderlund


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