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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * imgu.h - Intel IPU3 ImgU
 */
#ifndef __LIBCAMERA_PIPELINE_IPU3_IMGU_H__
#define __LIBCAMERA_PIPELINE_IPU3_IMGU_H__

#include <string>

#include "libcamera/internal/v4l2_subdevice.h"
#include "libcamera/internal/v4l2_videodevice.h"

namespace libcamera {

class FrameBuffer;
class MediaDevice;
struct Size;
struct StreamConfiguration;

class ImgUDevice
{
public:
	ImgUDevice()
		: imgu_(nullptr), input_(nullptr), output_(nullptr),
		  viewfinder_(nullptr), stat_(nullptr)
	{
	}

	~ImgUDevice()
	{
		delete imgu_;
		delete input_;
		delete output_;
		delete viewfinder_;
		delete stat_;
	}

	int init(MediaDevice *media, unsigned int index);

	int configureInput(const Size &size, V4L2DeviceFormat *inputFormat);

	int configureOutput(const StreamConfiguration &cfg,
			    V4L2DeviceFormat *outputFormat)
	{
		return configureVideoDevice(output_, PAD_OUTPUT, cfg,
					    outputFormat);
	}

	int configureViewfinder(const StreamConfiguration &cfg,
				V4L2DeviceFormat *outputFormat)
	{
		return configureVideoDevice(viewfinder_, PAD_VF, cfg,
					    outputFormat);
	}

	int configureStat(const StreamConfiguration &cfg,
			  V4L2DeviceFormat *outputFormat)
	{
		return configureVideoDevice(stat_, PAD_STAT, cfg, outputFormat);
	}

	int allocateBuffers(unsigned int bufferCount);
	void freeBuffers();

	int start();
	int stop();

	int enableLinks(bool enable);

	V4L2Subdevice *imgu_;
	V4L2VideoDevice *input_;
	V4L2VideoDevice *output_;
	V4L2VideoDevice *viewfinder_;
	V4L2VideoDevice *stat_;
	/* \todo Add param video device for 3A tuning */

private:
	static constexpr unsigned int PAD_INPUT = 0;
	static constexpr unsigned int PAD_OUTPUT = 2;
	static constexpr unsigned int PAD_VF = 3;
	static constexpr unsigned int PAD_STAT = 4;

	int linkSetup(const std::string &source, unsigned int sourcePad,
		      const std::string &sink, unsigned int sinkPad,
		      bool enable);

	int configureVideoDevice(V4L2VideoDevice *dev, unsigned int pad,
				 const StreamConfiguration &cfg,
				 V4L2DeviceFormat *outputFormat);

	std::string name_;
	MediaDevice *media_;
};

} /* namespace libcamera */

#endif /* __LIBCAMERA_PIPELINE_IPU3_IMGU_H__ */