From c0dc218eb8ca8a5b972e6daab14612003c3f4306 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Mon, 7 Oct 2019 22:30:27 +0300 Subject: libcamera: v4l2_controls: Add V4L2ControlId MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a V4L2 specialisation of the ControlId class, in order to construct a ControlId from a v4l2_query_ext_ctrl. The V4L2ControlId is embedded in V4L2ControlInfo, and thus needs to be copyable to allow for V4L2ControlInfo to be passed to IPAs. The ControlId copy constructor and assignment operators are thus restored, but made protected to avoid the Control class being copyable. This is needed in order to use ControlList for V4L2 controls, as ControlList requires ControlId instances for all controls. Signed-off-by: Laurent Pinchart Reviewed-by: Jacopo Mondi Tested-by: Niklas Söderlund Reviewed-by: Niklas Söderlund --- src/libcamera/include/v4l2_controls.h | 12 ++++--- src/libcamera/v4l2_controls.cpp | 67 ++++++++++++++++++++++++++++++----- src/libcamera/v4l2_device.cpp | 4 +-- 3 files changed, 68 insertions(+), 15 deletions(-) (limited to 'src') diff --git a/src/libcamera/include/v4l2_controls.h b/src/libcamera/include/v4l2_controls.h index b39370b2..71ce377f 100644 --- a/src/libcamera/include/v4l2_controls.h +++ b/src/libcamera/include/v4l2_controls.h @@ -20,23 +20,27 @@ namespace libcamera { +class V4L2ControlId : public ControlId +{ +public: + V4L2ControlId(const struct v4l2_query_ext_ctrl &ctrl); +}; + class V4L2ControlInfo { public: V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl); - unsigned int id() const { return id_; } + const ControlId &id() const { return id_; } unsigned int type() const { return type_; } size_t size() const { return size_; } - const std::string &name() const { return name_; } const ControlRange &range() const { return range_; } private: - unsigned int id_; + V4L2ControlId id_; unsigned int type_; size_t size_; - std::string name_; ControlRange range_; }; diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp index 6f5f1578..a630a258 100644 --- a/src/libcamera/v4l2_controls.cpp +++ b/src/libcamera/v4l2_controls.cpp @@ -7,6 +7,8 @@ #include "v4l2_controls.h" +#include + /** * \file v4l2_controls.h * \brief Support for V4L2 Controls using the V4L2 Extended Controls APIs @@ -47,6 +49,60 @@ namespace libcamera { +namespace { + +std::string v4l2_ctrl_name(const struct v4l2_query_ext_ctrl &ctrl) +{ + size_t len = strnlen(ctrl.name, sizeof(ctrl.name)); + return std::string(static_cast(ctrl.name), len); +} + +ControlType v4l2_ctrl_type(const struct v4l2_query_ext_ctrl &ctrl) +{ + switch (ctrl.type) { + case V4L2_CTRL_TYPE_BOOLEAN: + return ControlTypeBool; + + case V4L2_CTRL_TYPE_INTEGER: + return ControlTypeInteger32; + + case V4L2_CTRL_TYPE_INTEGER64: + return ControlTypeInteger64; + + case V4L2_CTRL_TYPE_MENU: + case V4L2_CTRL_TYPE_BUTTON: + case V4L2_CTRL_TYPE_BITMASK: + case V4L2_CTRL_TYPE_INTEGER_MENU: + /* + * More precise types may be needed, for now use a 32-bit + * integer type. + */ + return ControlTypeInteger32; + + default: + return ControlTypeNone; + } +} + +} /* namespace */ + +/** + * \class V4L2ControlId + * \brief V4L2 control static metadata + * + * The V4L2ControlId class is a specialisation of the ControlId for V4L2 + * controls. + */ + +/** + * \brief Construct a V4L2ControlId from a struct v4l2_query_ext_ctrl + * \param[in] ctrl The struct v4l2_query_ext_ctrl as returned by the kernel + */ +V4L2ControlId::V4L2ControlId(const struct v4l2_query_ext_ctrl &ctrl) + : ControlId(ctrl.id, v4l2_ctrl_name(ctrl), v4l2_ctrl_type(ctrl)) +{ +} + /** * \class V4L2ControlInfo * \brief Information on a V4L2 control @@ -66,13 +122,12 @@ namespace libcamera { /** * \brief Construct a V4L2ControlInfo from a struct v4l2_query_ext_ctrl - * \param ctrl The struct v4l2_query_ext_ctrl as returned by the kernel + * \param[in] ctrl The struct v4l2_query_ext_ctrl as returned by the kernel */ V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl) + : id_(ctrl) { - id_ = ctrl.id; type_ = ctrl.type; - name_ = static_cast(ctrl.name); size_ = ctrl.elem_size * ctrl.elems; if (ctrl.type == V4L2_CTRL_TYPE_INTEGER64) @@ -101,12 +156,6 @@ V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl) * \return The V4L2 control value data size */ -/** - * \fn V4L2ControlInfo::name() - * \brief Retrieve the control user readable name - * \return The V4L2 control user readable name - */ - /** * \fn V4L2ControlInfo::range() * \brief Retrieve the control value range diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp index 3bd82ff2..466c3d41 100644 --- a/src/libcamera/v4l2_device.cpp +++ b/src/libcamera/v4l2_device.cpp @@ -184,7 +184,7 @@ int V4L2Device::getControls(V4L2ControlList *ctrls) const V4L2ControlInfo *info = &iter->second; controlInfo[i] = info; - v4l2Ctrls[i].id = info->id(); + v4l2Ctrls[i].id = ctrl->id(); } struct v4l2_ext_controls v4l2ExtCtrls = {}; @@ -259,7 +259,7 @@ int V4L2Device::setControls(V4L2ControlList *ctrls) const V4L2ControlInfo *info = &iter->second; controlInfo[i] = info; - v4l2Ctrls[i].id = info->id(); + v4l2Ctrls[i].id = ctrl->id(); /* Set the v4l2_ext_control value for the write operation. */ switch (info->type()) { -- cgit v1.2.1