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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
*
* staggered_ctrl.h - Helper for writing staggered ctrls to a V4L2 device.
*/
#ifndef __LIBCAMERA_PIPELINE_RASPBERRYPI_STAGGERED_CTRL_H__
#define __LIBCAMERA_PIPELINE_RASPBERRYPI_STAGGERED_CTRL_H__
#include <array>
#include <initializer_list>
#include <mutex>
#include <unordered_map>
#include <utility>
namespace libcamera {
class ControlList;
class V4L2VideoDevice;
namespace RPi {
class StaggeredCtrl
{
public:
StaggeredCtrl()
: init_(false), setCount_(0), getCount_(0), maxDelay_(0)
{
}
operator bool() const
{
return init_;
}
void init(V4L2VideoDevice *dev,
std::initializer_list<std::pair<const uint32_t, uint8_t>> delayList);
void reset();
void get(std::unordered_map<uint32_t, int32_t> &ctrl, uint8_t offset = 0);
bool set(uint32_t ctrl, int32_t value);
bool set(std::initializer_list<std::pair<const uint32_t, int32_t>> ctrlList);
bool set(const ControlList &controls);
int write();
private:
void nextFrame();
/* listSize must be a power of 2. */
static constexpr int listSize = (1 << 4);
struct CtrlInfo {
CtrlInfo()
: value(0), updated(false)
{
}
CtrlInfo(int32_t value_)
: value(value_), updated(true)
{
}
int32_t value;
bool updated;
};
class CircularArray : public std::array<CtrlInfo, listSize>
{
public:
CtrlInfo &operator[](int index)
{
return std::array<CtrlInfo, listSize>::operator[](index & (listSize - 1));
}
const CtrlInfo &operator[](int index) const
{
return std::array<CtrlInfo, listSize>::operator[](index & (listSize - 1));
}
};
bool init_;
uint32_t setCount_;
uint32_t getCount_;
uint8_t maxDelay_;
V4L2VideoDevice *dev_;
std::unordered_map<uint32_t, uint8_t> delay_;
std::unordered_map<uint32_t, CircularArray> ctrl_;
std::mutex lock_;
};
} /* namespace RPi */
} /* namespace libcamera */
#endif /* __LIBCAMERA_PIPELINE_RASPBERRYPI_STAGGERED_CTRL_H__ */
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