@@ -7,14 +7,17 @@
#ifndef __LIBCAMERA_V4L2_DEVICE_H__
#define __LIBCAMERA_V4L2_DEVICE_H__
+#include <map>
#include <string>
namespace libcamera {
+class V4L2ControlInfo;
+
class V4L2Device
{
public:
- virtual ~V4L2Device() { close(); }
+ virtual ~V4L2Device();
protected:
V4L2Device();
@@ -28,7 +31,10 @@ protected:
int ioctl(unsigned long request, void *argp);
private:
+ int listControls();
+
int fd_;
+ std::map<unsigned int, V4L2ControlInfo *> controls_;
};
} /* namespace libcamera */
@@ -13,6 +13,7 @@
#include <unistd.h>
#include "log.h"
+#include "v4l2_controls.h"
/**
* \file v4l2_device.h
@@ -50,6 +51,14 @@ V4L2Device::V4L2Device()
{
}
+V4L2Device::~V4L2Device()
+{
+ for (auto &pair : controls_)
+ delete pair.second;
+
+ close();
+}
+
/**
* \fn V4L2Device::fd()
* \brief Retrieve the V4L2 device file descriptor
@@ -82,6 +91,28 @@ int V4L2Device::open(const std::string &pathname, unsigned int flags)
fd_ = ret;
+ listControls();
+
+ return 0;
+}
+
+int 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;
+ }
+
+ controls_[ctrl.id] = new V4L2ControlInfo(ctrl);
+ ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+ }
+
return 0;
}
Enumerate all the controls a device supports at open() time. Store the control informations in a map inside the device to save querying the control when setting or getting its value from the device. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> --- src/libcamera/include/v4l2_device.h | 8 +++++++- src/libcamera/v4l2_device.cpp | 31 +++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+), 1 deletion(-)