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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
*
* delayed_controls.h - Helper to deal with controls that take effect with a delay
*/
#ifndef __LIBCAMERA_INTERNAL_DELAYED_CONTROLS_H__
#define __LIBCAMERA_INTERNAL_DELAYED_CONTROLS_H__
#include <stdint.h>
#include <unordered_map>
#include <libcamera/controls.h>
namespace libcamera {
class V4L2Device;
class DelayedControls
{
public:
struct ControlParams {
unsigned int delay;
bool priorityWrite;
};
DelayedControls(V4L2Device *device,
const std::unordered_map<uint32_t, ControlParams> &controlParams);
void reset();
bool push(const ControlList &controls);
ControlList get(uint32_t sequence);
void applyControls(uint32_t sequence);
private:
class Info : public ControlValue
{
public:
Info()
: updated(false)
{
}
Info(const ControlValue &v)
: ControlValue(v), updated(true)
{
}
bool updated;
};
/* \todo: Make the listSize configurable at instance creation time. */
static constexpr int listSize = 16;
class ControlRingBuffer : public std::array<Info, listSize>
{
public:
Info &operator[](unsigned int index)
{
return std::array<Info, listSize>::operator[](index % listSize);
}
const Info &operator[](unsigned int index) const
{
return std::array<Info, listSize>::operator[](index % listSize);
}
};
V4L2Device *device_;
/* \todo Evaluate if we should index on ControlId * or unsigned int */
std::unordered_map<const ControlId *, ControlParams> controlParams_;
unsigned int maxDelay_;
bool running_;
uint32_t firstSequence_;
uint32_t queueCount_;
uint32_t writeCount_;
/* \todo Evaluate if we should index on ControlId * or unsigned int */
std::unordered_map<const ControlId *, ControlRingBuffer> values_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_INTERNAL_DELAYED_CONTROLS_H__ */
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