test/libtest/buffer_source.h


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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2020, Google Inc.
 *
 * buffer_source.h - libcamera camera test helper to create FrameBuffers
 */
#ifndef __LIBCAMERA_BUFFER_SOURCE_TEST_H__
#define __LIBCAMERA_BUFFER_SOURCE_TEST_H__

#include <libcamera/libcamera.h>

#include "libcamera/internal/media_device.h"
#include "libcamera/internal/v4l2_videodevice.h"

using namespace libcamera;

class BufferSource
{
public:
	BufferSource();
	~BufferSource();

	int allocate(const StreamConfiguration &config);
	const std::vector<std::unique_ptr<FrameBuffer>> &buffers();

private:
	std::shared_ptr<MediaDevice> media_;
	std::vector<std::unique_ptr<FrameBuffer>> buffers_;
};

#endif /* __LIBCAMERA_BUFFER_SOURCE_TEST_H__ */
/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2021, Raspberry Pi Ltd
 *
 * cam_helper_imx290.cpp - camera helper for imx290 sensor
 */

#include <math.h>

#include "cam_helper.h"

using namespace RPiController;

class CamHelperImx290 : public CamHelper
{
public:
	CamHelperImx290();
	uint32_t gainCode(double gain) const override;
	double gain(uint32_t gainCode) const override;
	void getDelays(int &exposureDelay, int &gainDelay,
		       int &vblankDelay) const override;
	unsigned int hideFramesModeSwitch() const override;

private:
	/*
	 * Smallest difference between the frame length and integration time,
	 * in units of lines.
	 */
	static constexpr int frameIntegrationDiff = 2;
};

CamHelperImx290::CamHelperImx290()
	: CamHelper({}, frameIntegrationDiff)
{
}

uint32_t CamHelperImx290::gainCode(double gain) const
{
	int code = 66.6667 * log10(gain);
	return std::max(0, std::min(code, 0xf0));
}

double CamHelperImx290::gain(uint32_t gainCode) const
{
	return pow(10, 0.015 * gainCode);
}

void CamHelperImx290::getDelays(int &exposureDelay, int &gainDelay,
				int &vblankDelay) const
{
	exposureDelay = 2;
	gainDelay = 2;
	vblankDelay = 2;
}

unsigned int CamHelperImx290::hideFramesModeSwitch() const
{
	/* After a mode switch, we seem to get 1 bad frame. */
	return 1;
}

static CamHelper *create()
{
	return new CamHelperImx290();
}

static RegisterCamHelper reg("imx290", &create);