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libcamera: Allow access to v4l2_query_ext_ctrl structure for a V4L2 control

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The V4L2Device::controlInfo method simply returns a pointer to the
v4l2_query_ext_ctrl structure for the given control, which has already
been retrieved and stored.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
David Plowman 2020-09-07 08:15:57 +01:00 • committed by Kieran Bingham
parent 15a98fab79
commit d522ad2549
2 changed files with 17 additions and 0 deletions
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2
include/libcamera/internal/v4l2_device.h
View file

@ -29,6 +29,8 @@ public:
ControlList getControls(const std::vector<uint32_t> &ids); ControlList getControls(const std::vector<uint32_t> &ids);
int setControls(ControlList *ctrls); int setControls(ControlList *ctrls);
const struct v4l2_query_ext_ctrl *controlInfo(uint32_t id) const;
const std::string &deviceNode() const { return deviceNode_; } const std::string &deviceNode() const { return deviceNode_; }
std::string devicePath() const; std::string devicePath() const;

15
src/libcamera/v4l2_device.cpp
View file

@ -353,6 +353,21 @@ int V4L2Device::setControls(ControlList *ctrls)
return ret; return ret;
} }
/**
* \brief Retrieve the v4l2_query_ext_ctrl information for the given control
* \param[in] id The V4L2 control id
* \return A pointer to the v4l2_query_ext_ctrl structure for the given
* control, or a null pointer if not found
*/
const struct v4l2_query_ext_ctrl *V4L2Device::controlInfo(uint32_t id) const
{
const auto it = controlInfo_.find(id);
if (it == controlInfo_.end())
return nullptr;
return &it->second;
}
/** /**
* \brief Retrieve the device path in sysfs * \brief Retrieve the device path in sysfs
* *