cdc2620549
The V4L2 requests API provides support to atomically tie controls to a set of buffers. This is especially common for m2m devices. Such a request is represented by an fd that is allocated via MEDIA_IOC_REQUEST_ALLOC and then passed to the various V4L2 functions. Implement a V4L2Request class to wrap such an fd and add the corresponding utility functions. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
97 lines
2.4 KiB
C++
97 lines
2.4 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
/*
|
|
* Copyright (C) 2019, Google Inc.
|
|
*
|
|
* Common base for V4L2 video devices and subdevices
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <map>
|
|
#include <memory>
|
|
#include <optional>
|
|
#include <stdint.h>
|
|
#include <vector>
|
|
|
|
#include <linux/videodev2.h>
|
|
|
|
#include <libcamera/base/log.h>
|
|
#include <libcamera/base/signal.h>
|
|
#include <libcamera/base/span.h>
|
|
#include <libcamera/base/unique_fd.h>
|
|
|
|
#include <libcamera/color_space.h>
|
|
#include <libcamera/controls.h>
|
|
|
|
#include "libcamera/internal/formats.h"
|
|
#include "libcamera/internal/v4l2_request.h"
|
|
|
|
namespace libcamera {
|
|
|
|
class EventNotifier;
|
|
|
|
class V4L2Device : protected Loggable
|
|
{
|
|
public:
|
|
void close();
|
|
bool isOpen() const { return fd_.isValid(); }
|
|
|
|
const ControlInfoMap &controls() const { return controls_; }
|
|
|
|
ControlList getControls(Span<const uint32_t> ids, const V4L2Request *request = nullptr);
|
|
int setControls(ControlList *ctrls, const V4L2Request *request = nullptr);
|
|
|
|
const struct v4l2_query_ext_ctrl *controlInfo(uint32_t id) const;
|
|
|
|
const std::string &deviceNode() const { return deviceNode_; }
|
|
std::string devicePath() const;
|
|
|
|
bool supportsFrameStartEvent();
|
|
int setFrameStartEnabled(bool enable);
|
|
Signal<uint32_t> frameStart;
|
|
|
|
void updateControlInfo();
|
|
|
|
protected:
|
|
V4L2Device(const std::string &deviceNode);
|
|
~V4L2Device();
|
|
|
|
int open(unsigned int flags);
|
|
int setFd(UniqueFD fd);
|
|
|
|
int ioctl(unsigned long request, void *argp);
|
|
|
|
int fd() const { return fd_.get(); }
|
|
|
|
template<typename T>
|
|
static std::optional<ColorSpace> toColorSpace(const T &v4l2Format,
|
|
PixelFormatInfo::ColourEncoding colourEncoding);
|
|
|
|
template<typename T>
|
|
static int fromColorSpace(const std::optional<ColorSpace> &colorSpace, T &v4l2Format);
|
|
|
|
private:
|
|
static ControlType v4l2CtrlType(uint32_t ctrlType);
|
|
static std::unique_ptr<ControlId> v4l2ControlId(const v4l2_query_ext_ctrl &ctrl);
|
|
std::optional<ControlInfo> v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl);
|
|
std::optional<ControlInfo> v4l2MenuControlInfo(const v4l2_query_ext_ctrl &ctrl);
|
|
|
|
void listControls();
|
|
void updateControls(ControlList *ctrls,
|
|
Span<const v4l2_ext_control> v4l2Ctrls);
|
|
|
|
void eventAvailable();
|
|
|
|
std::map<unsigned int, struct v4l2_query_ext_ctrl> controlInfo_;
|
|
std::vector<std::unique_ptr<ControlId>> controlIds_;
|
|
ControlIdMap controlIdMap_;
|
|
ControlInfoMap controls_;
|
|
std::string deviceNode_;
|
|
UniqueFD fd_;
|
|
|
|
EventNotifier *fdEventNotifier_;
|
|
bool frameStartEnabled_;
|
|
};
|
|
|
|
} /* namespace libcamera */
|