diff options
| author | David Plowman <david.plowman@raspberrypi.com> | 2020-09-07 08:15:57 +0100 |
|---|---|---|
| committer | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2020-09-29 11:43:06 +0100 |
| commit | d522ad2549dfbd494c4f47222951522abecaea01 (patch) | |
| tree | eac8463c43730a743f5984d9cad2c5fb2dc45d33 | |
| parent | 15a98fab79ae71638387b3e85356550710bb643b (diff) | |
libcamera: Allow access to v4l2_query_ext_ctrl structure for a V4L2 control
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>
| -rw-r--r-- | include/libcamera/internal/v4l2_device.h | 2 | ||||
| -rw-r--r-- | src/libcamera/v4l2_device.cpp | 15 |
2 files changed, 17 insertions, 0 deletions
diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h index 3b605aab..722fb722 100644 --- a/include/libcamera/internal/v4l2_device.h +++ b/include/libcamera/internal/v4l2_device.h @@ -29,6 +29,8 @@ public: ControlList getControls(const std::vector<uint32_t> &ids); int setControls(ControlList *ctrls); + const struct v4l2_query_ext_ctrl *controlInfo(uint32_t id) const; + const std::string &deviceNode() const { return deviceNode_; } std::string devicePath() const; diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp index 65830d41..31d4dad0 100644 --- a/src/libcamera/v4l2_device.cpp +++ b/src/libcamera/v4l2_device.cpp @@ -354,6 +354,21 @@ int V4L2Device::setControls(ControlList *ctrls) } /** + * \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 * * This function returns the sysfs path to the physical device backing the V4L2 |