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Diffstat (limited to 'src/libcamera/v4l2_controls.cpp')
| -rw-r--r-- | src/libcamera/v4l2_controls.cpp | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp deleted file mode 100644 index 3f8ec6ca..00000000 --- a/src/libcamera/v4l2_controls.cpp +++ /dev/null @@ -1,151 +0,0 @@ -/* SPDX-License-Identifier: LGPL-2.1-or-later */ -/* - * Copyright (C) 2019, Google Inc. - * - * v4l2_controls.cpp - V4L2 Controls Support - */ - -#include "libcamera/internal/v4l2_controls.h" - -#include <string.h> - -/** - * \file v4l2_controls.h - * \brief Support for V4L2 Controls using the V4L2 Extended Controls APIs - * - * The V4L2 Control API allows application to inspect and modify sets of - * configurable parameters on a video device or subdevice. The nature of the - * parameters an application can modify using the control framework depends on - * what the driver implements support for, and on the characteristics of the - * underlying hardware platform. Generally controls are used to modify user - * visible settings, such as the image brightness and exposure time, or - * non-standard parameters which cannot be controlled through the V4L2 format - * negotiation API. - * - * Controls are identified by a numerical ID, defined by the V4L2 kernel headers - * and have an associated type. Each control has a value, which is the data that - * can be modified with V4L2Device::setControls() or retrieved with - * V4L2Device::getControls(). - * - * The control's type along with the control's flags define the type of the - * control's value content. Controls can transport a single data value stored in - * variable inside the control, or they might as well deal with more complex - * data types, such as arrays of matrices, stored in a contiguous memory - * locations associated with the control and called 'the payload'. Such controls - * are called 'compound controls' and are currently not supported by the - * libcamera V4L2 control framework. - * - * libcamera implements support for controls using the V4L2 Extended Control - * API, which allows future handling of controls with payloads of arbitrary - * sizes. - * - * The libcamera V4L2 Controls framework operates on lists of controls, wrapped - * by the ControlList class, to match the V4L2 extended controls API. The - * interface to set and get control is implemented by the V4L2Device class, and - * this file only provides the data type definitions. - * - * \todo Add support for compound controls - */ - -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<const char *>(ctrl.name), len); -} - -ControlType v4l2_ctrl_type(const struct v4l2_query_ext_ctrl &ctrl) -{ - switch (ctrl.type) { - case V4L2_CTRL_TYPE_U8: - return ControlTypeByte; - - 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 Convenience specialisation of ControlInfo for V4L2 controls - * - * The V4L2ControlInfo class is a specialisation of the ControlInfo for V4L2 - * controls. It offers a convenience constructor from a struct - * v4l2_query_ext_ctrl, and is otherwise equivalent to the ControlInfo class. - */ - -/** - * \brief Construct a V4L2ControlInfo from a struct v4l2_query_ext_ctrl - * \param[in] ctrl The struct v4l2_query_ext_ctrl as returned by the kernel - */ -V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl) -{ - switch (ctrl.type) { - case V4L2_CTRL_TYPE_U8: - ControlInfo::operator=(ControlInfo(static_cast<uint8_t>(ctrl.minimum), - static_cast<uint8_t>(ctrl.maximum), - static_cast<uint8_t>(ctrl.default_value))); - break; - - case V4L2_CTRL_TYPE_BOOLEAN: - ControlInfo::operator=(ControlInfo(static_cast<bool>(ctrl.minimum), - static_cast<bool>(ctrl.maximum), - static_cast<bool>(ctrl.default_value))); - break; - - case V4L2_CTRL_TYPE_INTEGER64: - ControlInfo::operator=(ControlInfo(static_cast<int64_t>(ctrl.minimum), - static_cast<int64_t>(ctrl.maximum), - static_cast<int64_t>(ctrl.default_value))); - break; - - default: - ControlInfo::operator=(ControlInfo(static_cast<int32_t>(ctrl.minimum), - static_cast<int32_t>(ctrl.maximum), - static_cast<int32_t>(ctrl.default_value))); - break; - } -} - -} /* namespace libcamera */ |