diff options
| -rw-r--r-- | src/libcamera/include/v4l2_device.h | 8 | ||||
| -rw-r--r-- | src/libcamera/v4l2_device.cpp | 57 |
2 files changed, 65 insertions, 0 deletions
diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h index 75f23a05..55696046 100644 --- a/src/libcamera/include/v4l2_device.h +++ b/src/libcamera/include/v4l2_device.h @@ -7,18 +7,23 @@ #ifndef __LIBCAMERA_V4L2_DEVICE_H__ #define __LIBCAMERA_V4L2_DEVICE_H__ +#include <map> #include <string> #include "log.h" namespace libcamera { +class V4L2ControlInfo; + class V4L2Device : protected Loggable { public: void close(); bool isOpen() const { return fd_ != -1; } + const V4L2ControlInfo *getControlInfo(unsigned int id) const; + const std::string &deviceNode() const { return deviceNode_; } protected: @@ -32,6 +37,9 @@ protected: int fd() { return fd_; } private: + void listControls(); + + std::map<unsigned int, V4L2ControlInfo> controls_; std::string deviceNode_; int fd_; }; diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp index 99621a72..51764b44 100644 --- a/src/libcamera/v4l2_device.cpp +++ b/src/libcamera/v4l2_device.cpp @@ -13,6 +13,7 @@ #include <unistd.h> #include "log.h" +#include "v4l2_controls.h" /** * \file v4l2_device.h @@ -82,6 +83,8 @@ int V4L2Device::open(unsigned int flags) fd_ = ret; + listControls(); + return 0; } @@ -108,6 +111,21 @@ 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 + */ +const V4L2ControlInfo *V4L2Device::getControlInfo(unsigned int id) const +{ + auto it = controls_.find(id); + if (it == controls_.end()) + return nullptr; + + return &it->second; +} + +/** * \brief Perform an IOCTL system call on the device node * \param[in] request The IOCTL request code * \param[in] argp A pointer to the IOCTL argument @@ -137,4 +155,43 @@ int V4L2Device::ioctl(unsigned long request, void *argp) * \return The V4L2 device file descriptor, -1 if the device node is not open */ +/* + * \brief List and store information about all controls supported by the + * V4L2 device + */ +void V4L2Device::listControls() +{ + struct v4l2_query_ext_ctrl ctrl = {}; + + /* \todo Add support for menu and compound controls. */ + ctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL; + while (ioctl(VIDIOC_QUERY_EXT_CTRL, &ctrl) == 0) { + if (ctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS || + ctrl.flags & V4L2_CTRL_FLAG_DISABLED) { + ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + continue; + } + + V4L2ControlInfo info(ctrl); + switch (info.type()) { + case V4L2_CTRL_TYPE_INTEGER: + case V4L2_CTRL_TYPE_BOOLEAN: + case V4L2_CTRL_TYPE_MENU: + case V4L2_CTRL_TYPE_BUTTON: + case V4L2_CTRL_TYPE_INTEGER64: + case V4L2_CTRL_TYPE_BITMASK: + case V4L2_CTRL_TYPE_INTEGER_MENU: + break; + /* \todo Support compound controls. */ + default: + LOG(V4L2, Error) << "Control type '" << info.type() + << "' not supported"; + continue; + } + + controls_.emplace(ctrl.id, info); + ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + } +} + } /* namespace libcamera */ |