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authorUmang Jain <email@uajain.com>2020-10-06 11:14:59 +0530
committerKieran Bingham <kieran.bingham@ideasonboard.com>2020-10-07 14:42:10 +0100
commit6feebf297ead7b13495d01d9dffb5a09aab82af9 (patch)
treead4f3449866406bbaf06d4cb871944d7bce32104 /Documentation/meson.build
parentc57622d95ff0b8bbc3d7fc6194f16b0a55b79842 (diff)
android: jpeg: exif: Sanitize ASCII strings with utils::toAscii()
Use the newly introduced utils::toAscii() utility to remove all non-ASCII characters for EXIF_FORMAT_ASCII strings. Signed-off-by: Umang Jain <email@uajain.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'Documentation/meson.build')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.1 (git 2.18.0) at 2025-02-15 20:59:52 +0000
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021, Ideas On Board
 *
 * ipu3_agc.cpp - AGC/AEC control algorithm
 */

#include "agc.h"

#include <algorithm>
#include <chrono>
#include <cmath>

#include <libcamera/base/log.h>

#include <libcamera/ipa/core_ipa_interface.h>

#include "libipa/histogram.h"

namespace libcamera {

using namespace std::literals::chrono_literals;

namespace ipa::ipu3::algorithms {

LOG_DEFINE_CATEGORY(IPU3Agc)

/* Number of frames to wait before calculating stats on minimum exposure */
static constexpr uint32_t kInitialFrameMinAECount = 4;
/* Number of frames to wait between new gain/exposure estimations */
static constexpr uint32_t kFrameSkipCount = 6;

/* Maximum ISO value for analogue gain */
static constexpr uint32_t kMinISO = 100;
static constexpr uint32_t kMaxISO = 1500;

/* Maximum analogue gain value
 * \todo grab it from a camera helper */
static constexpr uint32_t kMinGain = kMinISO / 100;
static constexpr uint32_t kMaxGain = kMaxISO / 100;

/* \todo use calculated value based on sensor */
static constexpr uint32_t kMinExposure = 1;
static constexpr uint32_t kMaxExposure = 1976;

/* Histogram constants */
static constexpr uint32_t knumHistogramBins = 256;
static constexpr double kEvGainTarget = 0.5;

/* A cell is 8 bytes and contains averages for RGB values and saturation ratio */
static constexpr uint8_t kCellSize = 8;

Agc::Agc()
	: frameCount_(0), lastFrame_(0), iqMean_(0.0), lineDuration_(0s),
	  maxExposureTime_(0s), prevExposure_(0s), prevExposureNoDg_(0s),
	  currentExposure_(0s), currentExposureNoDg_(0s)
{
}

int Agc::configure([[maybe_unused]] IPAContext &context,
		   const IPAConfigInfo &configInfo)
{
	lineDuration_ = configInfo.sensorInfo.lineLength * 1.0s
		      / configInfo.sensorInfo.pixelRate;
	maxExposureTime_ = kMaxExposure * lineDuration_;

	return 0;
}

void Agc::processBrightness(const ipu3_uapi_stats_3a *stats,
			    const ipu3_uapi_grid_config &grid)
{
	const struct ipu3_uapi_grid_config statsAeGrid = stats->stats_4a_config.awb_config.grid;
	Rectangle aeRegion = { statsAeGrid.x_start,
			       statsAeGrid.y_start,
			       static_cast<unsigned int>(statsAeGrid.x_end - statsAeGrid.x_start) + 1,
			       static_cast<unsigned int>(statsAeGrid.y_end - statsAeGrid.y_start) + 1 };
	Point topleft = aeRegion.topLeft();
	int topleftX = topleft.x >> grid.block_width_log2;
	int topleftY = topleft.y >> grid.block_height_log2;

	/* Align to the grid cell width and height */
	uint32_t startX = topleftX << grid.block_width_log2;
	uint32_t startY = topleftY * grid.width << grid.block_width_log2;
	uint32_t endX = (startX + (aeRegion.size().width >> grid.block_width_log2)) << grid.block_width_log2;
	uint32_t i, j;
	uint32_t count = 0;

	uint32_t hist[knumHistogramBins] = { 0 };
	for (j = topleftY;
	     j < topleftY + (aeRegion.size().height >> grid.block_height_log2);
	     j++) {
		for (i = startX + startY; i < endX + startY; i += kCellSize) {
			/*
			 * The grid width (and maybe height) is not reliable.
			 * We observed a bit shift which makes the value 160 to be 32 in the stats grid.
			 * Use the one passed at init time.
			 */
			if (stats->awb_raw_buffer.meta_data[i + 4 + j * grid.width] == 0) {
				uint8_t Gr = stats->awb_raw_buffer.meta_data[i + 0 + j * grid.width];
				uint8_t Gb = stats->awb_raw_buffer.meta_data[i + 3 + j * grid.width];
				hist[(Gr + Gb) / 2]++;
				count++;
			}
		}
	}

	/* Estimate the quantile mean of the top 2% of the histogram */
	iqMean_ = Histogram(Span<uint32_t>(hist)).interQuantileMean(0.98, 1.0);
}

void Agc::filterExposure()
{
	double speed = 0.2;
	if (prevExposure_ == 0s) {
		/* DG stands for digital gain.*/