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authorNaushir Patuck <naush@raspberrypi.com>2020-11-27 14:56:12 +0000
committerKieran Bingham <kieran.bingham@ideasonboard.com>2020-12-07 14:03:38 +0000
commitee477efde8e49e26cc02437fd50a45cd439ee65e (patch)
treec31d8625f524aacc831251a6cb06863f8ab4193f /src/ipa/raspberrypi/controller
parent8fed613562677dd2402b6f67f0090fcba3301f1f (diff)
pipeline: ipa: raspberrypi: Handle failures during IPA configuration
If the IPA fails during configuration, return an error flag to the pipeline handler and fail the use case gracefully. At present, the IPA configuration can fail for the following reasons: - The sensor is not recognised, and fails to open a CamHelper object. - The pipeline handler did not pass in controls for the ISP and sensor. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src/ipa/raspberrypi/controller')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.1 (git 2.18.0) at 2025-05-22 19:55:45 +0000
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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019, Raspberry Pi Ltd
 *
 * helper class providing camera information
 */
#pragma once

#include <memory>
#include <string>
#include <utility>

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

#include "controller/camera_mode.h"
#include "controller/controller.h"
#include "controller/metadata.h"
#include "md_parser.h"

#include "libcamera/internal/v4l2_videodevice.h"

namespace RPiController {

/*
 * The CamHelper class provides a number of facilities that anyone trying
 * to drive a camera will need to know, but which are not provided by the
 * standard driver framework. Specifically, it provides:
 *
 * A "CameraMode" structure to describe extra information about the chosen
 * mode of the driver. For example, how it is cropped from the full sensor
 * area, how it is scaled, whether pixels are averaged compared to the full
 * resolution.
 *
 * The ability to convert between number of lines of exposure and actual
 * exposure time, and to convert between the sensor's gain codes and actual
 * gains.
 *
 * A function to return the number of frames of delay between updating exposure,
 * analogue gain and vblanking, and for the changes to take effect. For many
 * sensors these take the values 2, 1 and 2 respectively, but sensors that are
 * different will need to over-ride the default function provided.
 *
 * A function to query if the sensor outputs embedded data that can be parsed.
 *
 * A function to return the sensitivity of a given camera mode.
 *
 * A parser to parse the embedded data buffers provided by some sensors (for
 * example, the imx219 does; the ov5647 doesn't). This allows us to know for
 * sure the exposure and gain of the frame we're looking at. CamHelper
 * provides functions for converting analogue gains to and from the sensor's
 * native gain codes.
 *
 * Finally, a set of functions that determine how to handle the vagaries of
 * different camera modules on start-up or when switching modes. Some
 * modules may produce one or more frames that are not yet correctly exposed,
 * or where the metadata may be suspect. We have the following functions:
 * HideFramesStartup(): Tell the pipeline handler not to return this many
 *     frames at start-up. This can also be used to hide initial frames
 *     while the AGC and other algorithms are sorting themselves out.
 * HideFramesModeSwitch(): Tell the pipeline handler not to return this
 *     many frames after a mode switch (other than start-up). Some sensors
 *     may produce innvalid frames after a mode switch; others may not.
 * MistrustFramesStartup(): At start-up a sensor may return frames for
 *    which we should not run any control algorithms (for example, metadata
 *    may be invalid).
 * MistrustFramesModeSwitch(): The number of frames, after a mode switch
 *    (other than start-up), for which control algorithms should not run
 *    (for example, metadata may be unreliable).
 */

class CamHelper
{
public:
	static CamHelper *create(std::string const &camName);
	CamHelper(std::unique_ptr<MdParser> parser, unsigned int frameIntegrationDiff);
	virtual ~CamHelper();
	void setCameraMode(const CameraMode &mode);
	virtual void prepare(libcamera::Span<const uint8_t> buffer,
			     Metadata &metadata);
	virtual void process(StatisticsPtr &stats, Metadata &metadata);
	virtual uint32_t exposureLines(const libcamera::utils::Duration exposure,
				       const libcamera::utils::Duration lineLength) const;
	virtual libcamera::utils::Duration exposure(uint32_t exposureLines,