src/libcamera/pipeline/ipu3/imgu.cpp


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

#include "imgu.h"

#include <algorithm>
#include <cmath>
#include <limits>

#include <linux/media-bus-format.h>

#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>

#include <libcamera/formats.h>
#include <libcamera/stream.h>

#include "libcamera/internal/media_device.h"

namespace libcamera {

LOG_DECLARE_CATEGORY(IPU3)

namespace {

/*
 * The procedure to calculate the ImgU pipe configuration has been ported
 * from the pipe_config.py python script, available at:
 * https://github.com/intel/intel-ipu3-pipecfg
 * at revision: 243d13446e44 ("Fix some bug for some resolutions")
 */

/* BSD scaling factors: min=1, max=2.5, step=1/32 */
const std::vector<float> bdsScalingFactors = {
	1, 1.03125, 1.0625, 1.09375, 1.125, 1.15625, 1.1875, 1.21875, 1.25,
	1.28125, 1.3125, 1.34375, 1.375, 1.40625, 1.4375, 1.46875, 1.5, 1.53125,
	1.5625, 1.59375, 1.625, 1.65625, 1.6875, 1.71875, 1.75, 1.78125, 1.8125,
	1.84375, 1.875, 1.90625, 1.9375, 1.96875, 2, 2.03125, 2.0625, 2.09375,
	2.125, 2.15625, 2.1875, 2.21875, 2.25, 2.28125, 2.3125, 2.34375, 2.375,
	2.40625, 2.4375, 2.46875, 2.5
};

/* GDC scaling factors: min=1, max=16, step=1/4 */
const std::vector<float> gdcScalingFactors = {
	1, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4, 4.25,
	4.5, 4.75, 5, 5.25, 5.5, 5.75, 6, 6.25, 6.5, 6.75, 7, 7.25, 7.5, 7.75,
	8, 8.25, 8.5, 8.75, 9, 9.25, 9.5, 9.75, 10, 10.25, 10.5, 10.75, 11,
	11.25, 11.5, 11.75, 12, 12.25, 12.5, 12.75, 13, 13.25, 13.5, 13.75, 14,
	14.25, 14.5, 14.75, 15, 15.25, 15.5, 15.75, 16,
};

std::vector<ImgUDevice::PipeConfig> pipeConfigs;

struct FOV {
	float w;
	float h;

	bool isLarger(const FOV &other)
	{
		if (w > other.w)
			return true;
		if (w == other.w && h > other.h)
			return true;
		return false;
	}
};

/* Approximate a scaling factor sf to the closest one available in a range. */
float findScaleFactor(float sf, const std::vector<float> &range,
		      bool roundDown = false)
{
	if (sf <= range[0])
		return range[0];
	if (sf >= range[range.size() - 1])
		return range[range.size() - 1];

	float bestDiff = std::numeric_limits<float>::max();
	unsigned int index = 0;
	for (unsigned int i = 0; i < range.size(); ++i) {
		float diff = utils::abs_diff(sf, range[i]);
		if (diff < bestDiff) {
			bestDiff = diff;
			index = i;
		}
	}

	if (roundDown && index > 0 && sf < range[index])
		index--;

	return range[index];
}

bool isSameRatio(const Size &in, const Size &out)
{
	float inRatio = static_cast<float>(in.width) / in.height;
	float outRatio = static_cast<float>(out.width) / out.height;

	if (utils::abs_diff(inRatio, outRatio) > 0.1)
		return false;

	return true;
}

void calculateBDSHeight(ImgUDevice::Pipe *pipe, const Size &iif, const Size &gdc,
			unsigned int bdsWidth, float bdsSF)
{
	unsigned int minIFHeight = iif.height - ImgUDevice::kIFMaxCropHeight;
	unsigned int minBDSHeight = gdc.height + ImgUDevice::kFilterHeight * 2;
	unsigned int ifHeight;
	float bdsHeight;

	if (!isSameRatio(pipe->input, gdc)) {
		unsigned int foundIfHeight = 0;
		float estIFHeight = (iif.width * gdc.height) /
				    static_cast<float>(gdc.width);