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path: root/utils/ipc/mojo/public/tools/bindings/BUILD.gn

Age	Commit message (Collapse)	Author
2021-05-26	utils: ipc: Update mojo	Paul Elder
	Update mojo from the Chromium repository. The commit from which this was taken is: 9c138d992bfc1fb8f4f7bcf58d00bf19c219e4e2 "Updating trunk VERSION from 4523.0 to 4524.0" The update-mojo.sh script was used for this update. Bug: https://bugs.libcamera.org/show_bug.cgi?id=34 Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-11-11	utils: ipc: import mojo	Paul Elder
	Import mojo from the Chromium repository, so that we can use it for generating code for the IPC mechanism. The commit from which this was taken is: a079161ec8c6907b883f9cb84fc8c4e7896cb1d0 "Add PPAPI constructs for sending focus object to PdfAccessibilityTree" This tree has been pruned to remove directories that didn't have any necessary code: - mojo/* except for mojo/public - mojo core, docs, and misc files - mojo/public/* except for mojo/public/{tools,LICENSE} - language bindings for IPC, tests, and some mojo internals - mojo/public/tools/{fuzzers,chrome_ipc} - mojo/public/tools/bindings/generators - code generation for other languages No files were modified. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

generated by cgit v1.2.1 (git 2.18.0) at 2024-07-02 20:00:22 +0000

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * ipu3.cpp - Pipeline handler for Intel IPU3
 */

#include <algorithm>
#include <iomanip>
#include <memory>
#include <queue>
#include <vector>

#include <libcamera/camera.h>
#include <libcamera/control_ids.h>
#include <libcamera/formats.h>
#include <libcamera/ipa/ipu3.h>
#include <libcamera/request.h>
#include <libcamera/stream.h>

#include "libcamera/internal/camera_sensor.h"
#include "libcamera/internal/delayed_controls.h"
#include "libcamera/internal/device_enumerator.h"
#include "libcamera/internal/ipa_manager.h"
#include "libcamera/internal/log.h"
#include "libcamera/internal/media_device.h"
#include "libcamera/internal/pipeline_handler.h"
#include "libcamera/internal/utils.h"
#include "libcamera/internal/v4l2_controls.h"

#include "cio2.h"
#include "frames.h"
#include "imgu.h"

namespace libcamera {

LOG_DEFINE_CATEGORY(IPU3)

static constexpr unsigned int IPU3_BUFFER_COUNT = 4;
static constexpr unsigned int IPU3_MAX_STREAMS = 3;
static const Size IMGU_OUTPUT_MIN_SIZE = { 2, 2 };
static const Size IMGU_OUTPUT_MAX_SIZE = { 4480, 34004 };
static constexpr unsigned int IMGU_OUTPUT_WIDTH_ALIGN = 64;
static constexpr unsigned int IMGU_OUTPUT_HEIGHT_ALIGN = 4;
static constexpr unsigned int IMGU_OUTPUT_WIDTH_MARGIN = 64;
static constexpr unsigned int IMGU_OUTPUT_HEIGHT_MARGIN = 32;
static constexpr Size IPU3ViewfinderSize(1280, 720);

static const ControlInfoMap::Map IPU3Controls = {
	{ &controls::draft::PipelineDepth, ControlInfo(2, 3) },
};

class IPU3CameraData : public CameraData
{
public:
	IPU3CameraData(PipelineHandler *pipe)
		: CameraData(pipe), exposureTime_(0)
	{
	}

	int loadIPA();

	void imguOutputBufferReady(FrameBuffer *buffer);
	void cio2BufferReady(FrameBuffer *buffer);
	void paramBufferReady(FrameBuffer *buffer);
	void statBufferReady(FrameBuffer *buffer);

	CIO2Device cio2_;
	ImgUDevice *imgu_;

	Stream outStream_;
	Stream vfStream_;
	Stream rawStream_;

	uint32_t exposureTime_;
	std::unique_ptr<DelayedControls> delayedCtrls_;
	IPU3Frames frameInfos_;

private:
	void queueFrameAction(unsigned int id, const IPAOperationData &op);
};

class IPU3CameraConfiguration : public CameraConfiguration
{
public:
	IPU3CameraConfiguration(IPU3CameraData *data);

	Status validate() override;

	const StreamConfiguration &cio2Format() const { return cio2Configuration_; }
	const ImgUDevice::PipeConfig imguConfig() const { return pipeConfig_; }

private:
	/*
	 * The IPU3CameraData instance is guaranteed to be valid as long as the
	 * corresponding Camera instance is valid. In order to borrow a
	 * reference to the camera data, store a new reference to the camera.
	 */
	const IPU3CameraData *data_;

	StreamConfiguration cio2Configuration_;
	ImgUDevice::PipeConfig pipeConfig_;
};

class PipelineHandlerIPU3 : public PipelineHandler
{
public:
	static constexpr unsigned int V4L2_CID_IPU3_PIPE_MODE = 0x009819c1;

	enum IPU3PipeModes {
		IPU3PipeModeVideo = 0,
		IPU3PipeModeStillCapture = 1,
	};

	PipelineHandlerIPU3(CameraManager *manager);

	CameraConfiguration *generateConfiguration(Camera *camera,
		const StreamRoles &roles) override;
	int configure(Camera *camera, CameraConfiguration *config) override;

	int exportFrameBuffers(Camera *camera, Stream *stream,
			       std::vector<std::unique_ptr<FrameBuffer>> *buffers) override;

	int start(Camera *camera, ControlList *controls) override;
	void stop(Camera *camera) override;

	int queueRequestDevice(Camera *camera, Request *request) override;

	bool match(DeviceEnumerator *enumerator) override;

private:
	IPU3CameraData *cameraData(const Camera *camera)
	{
		return static_cast<IPU3CameraData *>(
			PipelineHandler::cameraData(camera));
	}

	int initControls(IPU3CameraData *data);
	int registerCameras();

	int allocateBuffers(Camera *camera);
	int freeBuffers(Camera *camera);

	ImgUDevice imgu0_;
	ImgUDevice imgu1_;
	MediaDevice *cio2MediaDev_;
	MediaDevice *imguMediaDev_;

	std::vector<IPABuffer> ipaBuffers_;
};

IPU3CameraConfiguration::IPU3CameraConfiguration(IPU3CameraData *data)
	: CameraConfiguration()
{
	data_ = data;
}

CameraConfiguration::Status IPU3CameraConfiguration::validate()
{
	Status status = Valid;

	if (config_.empty())
		return Invalid;

	if (transform != Transform::Identity) {
		transform = Transform::Identity;
		status = Adjusted;
	}

	/* Cap the number of entries to the available streams. */
	if (config_.size() > IPU3_MAX_STREAMS) {
		config_.resize(IPU3_MAX_STREAMS);
		status = Adjusted;
	}

	/* Validate the requested stream configuration */
	unsigned int rawCount = 0;
	unsigned int yuvCount = 0;
	Size maxYuvSize;

	for (const StreamConfiguration &cfg : config_) {
		const PixelFormatInfo &info = PixelFormatInfo::info(cfg.pixelFormat);

		if (info.colourEncoding == PixelFormatInfo::ColourEncodingRAW) {
			rawCount++;
		} else {
			yuvCount++;
			maxYuvSize.expandTo(cfg.size);
		}
	}

	if (rawCount > 1 || yuvCount > 2) {
		LOG(IPU3, Debug) << "Camera configuration not supported";
		return Invalid;
	}

	/*
	 * Generate raw configuration from CIO2.
	 *
	 * \todo The image sensor frame size should be selected to optimize
	 * operations based on the sizes of the requested streams. However such
	 * a selection makes the pipeline configuration procedure fail for small
	 * resolutions (for example: 640x480 with OV5670) and causes the capture
	 * operations to stall for some stream size combinations (see the
	 * commit message of the patch that introduced this comment for more
	 * failure examples).
	 *
	 * Until the sensor frame size calculation criteria are clarified,
	 * always use the largest possible one which guarantees better results
	 * at the expense of the frame rate and CSI-2 bus bandwidth.
	 */
	cio2Configuration_ = data_->cio2_.generateConfiguration({});
	if (!cio2Configuration_.pixelFormat.isValid())
		return Invalid;

	LOG(IPU3, Debug) << "CIO2 configuration: " << cio2Configuration_.toString();

	ImgUDevice::Pipe pipe{};
	pipe.input = cio2Configuration_.size;

	/*
	 * Adjust the configurations if needed and assign streams while
	 * iterating them.
	 */
	bool mainOutputAvailable = true;
	for (unsigned int i = 0; i < config_.size(); ++i) {
		const PixelFormatInfo &info = PixelFormatInfo::info(config_[i].pixelFormat);
		const StreamConfiguration originalCfg = config_[i];
		StreamConfiguration *cfg = &config_[i];

		LOG(IPU3, Debug) << "Validating stream: " << config_[i].toString();

		if (info.colourEncoding == PixelFormatInfo::ColourEncodingRAW) {
			/* Initialize the RAW stream with the CIO2 configuration. */
			cfg->size = cio2Configuration_.size;
			cfg->pixelFormat = cio2Configuration_.pixelFormat;
			cfg->bufferCount = cio2Configuration_.bufferCount;
			cfg->stride = info.stride(cfg->size.width, 0, 64);
			cfg->frameSize = info.frameSize(cfg->size, 64);
			cfg->setStream(const_cast<Stream *>(&data_->rawStream_));

			LOG(IPU3, Debug) << "Assigned " << cfg->toString()
					 << " to the raw stream";
		} else {
			/* Assign and configure the main and viewfinder outputs. */

			/*
			 * Clamp the size to match the ImgU size limits and the
			 * margins from the CIO2 output frame size.
			 *
			 * The ImgU outputs needs to be strictly smaller than
			 * the CIO2 output frame and rounded down to 64 pixels
			 * in width and 32 pixels in height. This assumption
			 * comes from inspecting the pipe configuration script
			 * results and the available suggested configurations in
			 * the ChromeOS BSP .xml camera tuning files and shall
			 * be validated.
			 *
			 * \todo Clarify what are the hardware constraints
			 * that require this alignements, if any. It might
			 * depend on the BDS scaling factor of 1/32, as the main
			 * output has no YUV scaler as the viewfinder output has.
			 */
			unsigned int limit;
			limit = utils::alignDown(cio2Configuration_.size.width - 1,
						 IMGU_OUTPUT_WIDTH_MARGIN);
			cfg->size.width = std::clamp(cfg->size.width,
						     IMGU_OUTPUT_MIN_SIZE.width,
						     limit);

			limit = utils::alignDown(cio2Configuration_.size.height - 1,
						 IMGU_OUTPUT_HEIGHT_MARGIN);
			cfg->size.height = std::clamp(cfg->size.height,
						      IMGU_OUTPUT_MIN_SIZE.height,
						      limit);

			cfg->size.alignDownTo(IMGU_OUTPUT_WIDTH_ALIGN,
					      IMGU_OUTPUT_HEIGHT_ALIGN);

			cfg->pixelFormat = formats::NV12;
			cfg->bufferCount = IPU3_BUFFER_COUNT;
			cfg->stride = info.stride(cfg->size.width, 0, 1);
			cfg->frameSize = info.frameSize(cfg->size, 1);

			/*
			 * Use the main output stream in case only one stream is
			 * requested or if the current configuration is the one
			 * with the maximum YUV output size.
			 */
			if (mainOutputAvailable &&
			    (originalCfg.size == maxYuvSize || yuvCount == 1)) {
				cfg->setStream(const_cast<Stream *>(&data_->outStream_));
				mainOutputAvailable = false;

				pipe.main = cfg->size;
				if (yuvCount == 1)
					pipe.viewfinder = pipe.main;

				LOG(IPU3, Debug) << "Assigned " << cfg->toString()
						 << " to the main output";
			} else {
				cfg->setStream(const_cast<Stream *>(&data_->vfStream_));
				pipe.viewfinder = cfg->size;

				LOG(IPU3, Debug) << "Assigned " << cfg->toString()
						 << " to the viewfinder output";
			}
		}

		if (cfg->pixelFormat != originalCfg.pixelFormat ||
		    cfg->size != originalCfg.size) {
			LOG(IPU3, Debug)
				<< "Stream " << i << " configuration adjusted to "
				<< cfg->toString();
			status = Adjusted;
		}
	}

	/* Only compute the ImgU configuration if a YUV stream has been requested. */
	if (yuvCount) {
		pipeConfig_ = data_->imgu_->calculatePipeConfig(&pipe);
		if (pipeConfig_.isNull()) {
			LOG(IPU3, Error) << "Failed to calculate pipe configuration: "
					 << "unsupported resolutions.";
			return Invalid;
		}
	}

	return status;
}

PipelineHandlerIPU3::PipelineHandlerIPU3(CameraManager *manager)
	: PipelineHandler(manager), cio2MediaDev_(nullptr), imguMediaDev_(nullptr)
{
}

CameraConfiguration *PipelineHandlerIPU3::generateConfiguration(Camera *camera,
								const StreamRoles &roles)
{
	IPU3CameraData *data = cameraData(camera);
	IPU3CameraConfiguration *config = new IPU3CameraConfiguration(data);

	if (roles.empty())
		return config;

	Size sensorResolution = data->cio2_.sensor()->resolution();
	for (const StreamRole role : roles) {
		std::map<PixelFormat, std::vector<SizeRange>> streamFormats;
		unsigned int bufferCount;
		PixelFormat pixelFormat;
		Size size;

		switch (role) {
		case StreamRole::StillCapture:
			/*
			 * Use as default full-frame configuration a value
			 * strictly smaller than the sensor resolution (limited
			 * to the ImgU  maximum output size) and aligned down to
			 * the required frame margin.
			 *
			 * \todo Clarify the alignment constraints as explained
			 * in validate()
			 */
			size = sensorResolution.boundedTo(IMGU_OUTPUT_MAX_SIZE);
			size.width = utils::alignDown(size.width - 1,
						      IMGU_OUTPUT_WIDTH_MARGIN);
			size.height = utils::alignDown(size.height - 1,
						       IMGU_OUTPUT_HEIGHT_MARGIN);
			pixelFormat = formats::NV12;
			bufferCount = IPU3_BUFFER_COUNT;
			streamFormats[pixelFormat] = { { IMGU_OUTPUT_MIN_SIZE, size } };

			break;

		case StreamRole::Raw: {
			StreamConfiguration cio2Config =
				data->cio2_.generateConfiguration(sensorResolution);
			pixelFormat = cio2Config.pixelFormat;
			size = cio2Config.size;
			bufferCount = cio2Config.bufferCount;

			for (const PixelFormat &format : data->cio2_.formats())
				streamFormats[format] = data->cio2_.sizes();

			break;
		}

		case StreamRole::Viewfinder:
		case StreamRole::VideoRecording: {
			/*
			 * Default viewfinder and videorecording to 1280x720,
			 * capped to the maximum sensor resolution and aligned
			 * to the ImgU output constraints.
			 */
			size = sensorResolution.boundedTo(IPU3ViewfinderSize)
					       .alignedDownTo(IMGU_OUTPUT_WIDTH_ALIGN,
							      IMGU_OUTPUT_HEIGHT_ALIGN);
			pixelFormat = formats::NV12;
			bufferCount = IPU3_BUFFER_COUNT;
			streamFormats[pixelFormat] = { { IMGU_OUTPUT_MIN_SIZE, size } };

			break;
		}

		default:
			LOG(IPU3, Error)
				<< "Requested stream role not supported: " << role;
			delete config;
			return nullptr;
		}

		StreamFormats formats(streamFormats);
		StreamConfiguration cfg(formats);
		cfg.size = size;
		cfg.pixelFormat = pixelFormat;
		cfg.bufferCount = bufferCount;
		config->addConfiguration(cfg);
	}

	if (config->validate() == CameraConfiguration::Invalid)
		return {};

	return config;
}

int PipelineHandlerIPU3::configure(Camera *camera, CameraConfiguration *c)
{
	IPU3CameraConfiguration *config =
		static_cast<IPU3CameraConfiguration *>(c);
	IPU3CameraData *data = cameraData(camera);
	Stream *outStream = &data->outStream_;
	Stream *vfStream = &data->vfStream_;
	CIO2Device *cio2 = &data->cio2_;
	ImgUDevice *imgu = data->imgu_;
	V4L2DeviceFormat outputFormat;
	int ret;

	/*
	 * FIXME: enabled links in one ImgU pipe interfere with capture
	 * operations on the other one. This can be easily triggered by
	 * capturing from one camera and then trying to capture from the other
	 * one right after, without disabling media links on the first used
	 * pipe.
	 *
	 * The tricky part here is where to disable links on the ImgU instance
	 * which is currently not in use:
	 * 1) Link enable/disable cannot be done at start()/stop() time as video
	 * devices needs to be linked first before format can be configured on
	 * them.
	 * 2) As link enable has to be done at the least in configure(),
	 * before configuring formats, the only place where to disable links
	 * would be 'stop()', but the Camera class state machine allows
	 * start()<->stop() sequences without any configure() in between.
	 *
	 * As of now, disable all links in the ImgU media graph before
	 * configuring the device, to allow alternate the usage of the two
	 * ImgU pipes.
	 *
	 * As a consequence, a Camera using an ImgU shall be configured before
	 * any start()/stop() sequence. An application that wants to
	 * pre-configure all the camera and then start/stop them alternatively
	 * without going through any re-configuration (a sequence that is
	 * allowed by the Camera state machine) would now fail on the IPU3.
	 */
	ret = imguMediaDev_->disableLinks();
	if (ret)
		return ret;

	/*
	 * \todo: Enable links selectively based on the requested streams.
	 * As of now, enable all links unconditionally.
	 * \todo Don't configure the ImgU at all if we only have a single
	 * stream which is for raw capture, in which case no buffers will
	 * ever be queued to the ImgU.
	 */
	ret = data->imgu_->enableLinks(true);
	if (ret)
		return ret;

	/*
	 * Pass the requested stream size to the CIO2 unit and get back the
	 * adjusted format to be propagated to the ImgU output devices.
	 */
	const Size &sensorSize = config->cio2Format().size;
	V4L2DeviceFormat cio2Format;
	ret = cio2->configure(sensorSize, &cio2Format);
	if (ret)
		return ret;

	/*
	 * If the ImgU gets configured, its driver seems to expect that
	 * buffers will be queued to its outputs, as otherwise the next
	 * capture session that uses the ImgU fails when queueing
	 * buffers to its input.
	 *
	 * If no ImgU configuration has been computed, it means only a RAW
	 * stream has been requested: return here to skip the ImgU configuration
	 * part.
	 */
	ImgUDevice::PipeConfig imguConfig = config->imguConfig();
	if (imguConfig.isNull())
		return 0;

	ret = imgu->configure(imguConfig, &cio2Format);
	if (ret)
		return ret;

	/* Apply the format to the configured streams output devices. */
	StreamConfiguration *mainCfg = nullptr;
	StreamConfiguration *vfCfg = nullptr;

	for (unsigned int i = 0; i < config->size(); ++i) {
		StreamConfiguration &cfg = (*config)[i];
		Stream *stream = cfg.stream();

		if (stream == outStream) {
			mainCfg = &cfg;
			ret = imgu->configureOutput(cfg, &outputFormat);
			if (ret)
				return ret;
		} else if (stream == vfStream) {
			vfCfg = &cfg;
			ret = imgu->configureViewfinder(cfg, &outputFormat);
			if (ret)
				return ret;
		}
	}

	/*
	 * As we need to set format also on the non-active streams, use
	 * the configuration of the active one for that purpose (there should
	 * be at least one active stream in the configuration request).
	 */
	if (!vfCfg) {
		ret = imgu->configureViewfinder(*mainCfg, &outputFormat);
		if (ret)
			return ret;
	}

	/* Apply the "pipe_mode" control to the ImgU subdevice. */
	ControlList ctrls(imgu->imgu_->controls());
	ctrls.set(V4L2_CID_IPU3_PIPE_MODE,
		  static_cast<int32_t>(vfCfg ? IPU3PipeModeVideo :
				       IPU3PipeModeStillCapture));
	ret = imgu->imgu_->setControls(&ctrls);
	if (ret) {
		LOG(IPU3, Error) << "Unable to set pipe_mode control";
		return ret;
	}

	return 0;
}

int PipelineHandlerIPU3::exportFrameBuffers(Camera *camera, Stream *stream,
					    std::vector<std::unique_ptr<FrameBuffer>> *buffers)
{
	IPU3CameraData *data = cameraData(camera);
	unsigned int count = stream->configuration().bufferCount;

	if (stream == &data->outStream_)
		return data->imgu_->output_->exportBuffers(count, buffers);
	else if (stream == &data->vfStream_)
		return data->imgu_->viewfinder_->exportBuffers(count, buffers);
	else if (stream == &data->rawStream_)
		return data->cio2_.exportBuffers(count, buffers);

	return -EINVAL;
}

/**
 * \todo Clarify if 'viewfinder' and 'stat' nodes have to be set up and
 * started even if not in use. As of now, if not properly configured and
 * enabled, the ImgU processing pipeline stalls.
 *
 * In order to be able to start the 'viewfinder' and 'stat' nodes, we need
 * memory to be reserved.
 */
int PipelineHandlerIPU3::allocateBuffers(Camera *camera)
{
	IPU3CameraData *data = cameraData(camera);
	ImgUDevice *imgu = data->imgu_;
	unsigned int bufferCount;
	int ret;

	bufferCount = std::max({
		data->outStream_.configuration().bufferCount,
		data->vfStream_.configuration().bufferCount,
		data->rawStream_.configuration().bufferCount,
	});

	ret = imgu->allocateBuffers(bufferCount);
	if (ret < 0)
		return ret;

	/* Map buffers to the IPA. */
	unsigned int ipaBufferId = 1;

	for (const std::unique_ptr<FrameBuffer> &buffer : imgu->paramBuffers_) {
		buffer->setCookie(ipaBufferId++);
		ipaBuffers_.push_back({
			.id = buffer->cookie(),
			.planes = buffer->planes()
		});
	}

	for (const std::unique_ptr<FrameBuffer> &buffer : imgu->statBuffers_) {
		buffer->setCookie(ipaBufferId++);
		ipaBuffers_.push_back({
			.id = buffer->cookie(),
			.planes = buffer->planes()
		});
	}

	data->ipa_->mapBuffers(ipaBuffers_);

	data->frameInfos_.init(imgu->paramBuffers_, imgu->statBuffers_);

	return 0;
}

int PipelineHandlerIPU3::freeBuffers(Camera *camera)
{
	IPU3CameraData *data = cameraData(camera);

	data->frameInfos_.clear();

	std::vector<unsigned int> ids;
	for (IPABuffer &ipabuf : ipaBuffers_)
		ids.push_back(ipabuf.id);

	data->ipa_->unmapBuffers(ids);
	ipaBuffers_.clear();

	data->imgu_->freeBuffers();

	return 0;
}

int PipelineHandlerIPU3::start(Camera *camera, [[maybe_unused]] ControlList *controls)
{
	IPU3CameraData *data = cameraData(camera);
	CIO2Device *cio2 = &data->cio2_;
	ImgUDevice *imgu = data->imgu_;

	CameraSensorInfo sensorInfo = {};
	std::map<unsigned int, IPAStream> streamConfig;
	std::map<unsigned int, const ControlInfoMap &> entityControls;
	IPAOperationData ipaConfig;
	IPAOperationData result = {};

	int ret;

	/* Allocate buffers for internal pipeline usage. */
	ret = allocateBuffers(camera);
	if (ret)
		return ret;

	IPAOperationData ipaData = {};
	ret = data->ipa_->start(ipaData, nullptr);
	if (ret)
		goto error;

	/*
	 * Start the ImgU video devices, buffers will be queued to the
	 * ImgU output and viewfinder when requests will be queued.
	 */
	ret = cio2->start();
	if (ret)
		goto error;

	ret = imgu->start();
	if (ret)
		goto error;

	/* Inform IPA of stream configuration and sensor controls. */
	ret = data->cio2_.sensor()->sensorInfo(&sensorInfo);
	if (ret)
		goto error;

	streamConfig[0] = {
		.pixelFormat = data->outStream_.configuration().pixelFormat,
		.size = data->outStream_.configuration().size,
	};
	streamConfig[1] = {
		.pixelFormat = data->vfStream_.configuration().pixelFormat,
		.size = data->vfStream_.configuration().size,
	};

	entityControls.emplace(0, data->cio2_.sensor()->controls());

	data->ipa_->configure(sensorInfo, streamConfig, entityControls,
			      ipaConfig, &result);

	return 0;

error:
	imgu->stop();
	cio2->stop();
	data->ipa_->stop();
	freeBuffers(camera);
	LOG(IPU3, Error) << "Failed to start camera " << camera->id();

	return ret;
}

void PipelineHandlerIPU3::stop(Camera *camera)
{
	IPU3CameraData *data = cameraData(camera);
	int ret = 0;

	ret |= data->imgu_->stop();
	ret |= data->cio2_.stop();
	if (ret)
		LOG(IPU3, Warning) << "Failed to stop camera " << camera->id();

	data->ipa_->stop();

	freeBuffers(camera);
}

int PipelineHandlerIPU3::queueRequestDevice(Camera *camera, Request *request)
{
	IPU3CameraData *data = cameraData(camera);

	IPU3Frames::Info *info = data->frameInfos_.create(request);
	if (!info)
		return -ENOBUFS;

	/*
	 * Queue a buffer on the CIO2, using the raw stream buffer provided in
	 * the request, if any, or a CIO2 internal buffer otherwise.
	 */
	FrameBuffer *reqRawBuffer = request->findBuffer(&data->rawStream_);
	FrameBuffer *rawBuffer = data->cio2_.queueBuffer(request, reqRawBuffer);
	if (!rawBuffer) {
		data->frameInfos_.remove(info);
		return -ENOMEM;
	}

	info->rawBuffer = rawBuffer;

	IPAOperationData op;
	op.operation = IPU3_IPA_EVENT_PROCESS_CONTROLS;
	op.data = { info->id };
	op.controls = { request->controls() };
	data->ipa_->processEvent(op);

	return 0;
}

bool PipelineHandlerIPU3::match(DeviceEnumerator *enumerator)
{
	int ret;

	DeviceMatch cio2_dm("ipu3-cio2");
	cio2_dm.add("ipu3-csi2 0");
	cio2_dm.add("ipu3-cio2 0");
	cio2_dm.add("ipu3-csi2 1");
	cio2_dm.add("ipu3-cio2 1");
	cio2_dm.add("ipu3-csi2 2");
	cio2_dm.add("ipu3-cio2 2");
	cio2_dm.add("ipu3-csi2 3");
	cio2_dm.add("ipu3-cio2 3");

	DeviceMatch imgu_dm("ipu3-imgu");
	imgu_dm.add("ipu3-imgu 0");
	imgu_dm.add("ipu3-imgu 0 input");
	imgu_dm.add("ipu3-imgu 0 parameters");
	imgu_dm.add("ipu3-imgu 0 output");
	imgu_dm.add("ipu3-imgu 0 viewfinder");
	imgu_dm.add("ipu3-imgu 0 3a stat");
	imgu_dm.add("ipu3-imgu 1");
	imgu_dm.add("ipu3-imgu 1 input");
	imgu_dm.add("ipu3-imgu 1 parameters");
	imgu_dm.add("ipu3-imgu 1 output");
	imgu_dm.add("ipu3-imgu 1 viewfinder");
	imgu_dm.add("ipu3-imgu 1 3a stat");

	cio2MediaDev_ = acquireMediaDevice(enumerator, cio2_dm);
	if (!cio2MediaDev_)
		return false;

	imguMediaDev_ = acquireMediaDevice(enumerator, imgu_dm);
	if (!imguMediaDev_)
		return false;

	/*
	 * Disable all links that are enabled by default on CIO2, as camera
	 * creation enables all valid links it finds.
	 */
	if (cio2MediaDev_->disableLinks())
		return false;

	ret = imguMediaDev_->disableLinks();
	if (ret)
		return ret;

	ret = registerCameras();

	return ret == 0;
}

/**
 * \brief Initialize the camera controls
 * \param[in] data The camera data
 *
 * Initialize the camera controls as the union of the static pipeline handler
 * controls (IPU3Controls) and controls created dynamically from the sensor
 * capabilities.
 *
 * \return 0 on success or a negative error code otherwise
 */
int PipelineHandlerIPU3::initControls(IPU3CameraData *data)
{
	CameraSensor *sensor = data->cio2_.sensor();
	CameraSensorInfo sensorInfo{};

	int ret = sensor->sensorInfo(&sensorInfo);
	if (ret)
		return ret;

	ControlInfoMap::Map controls = IPU3Controls;

	/*
	 * Compute exposure time limits.
	 *
	 * \todo The exposure limits depend on the sensor configuration.
	 * Initialize the control using the line length and pixel rate of the
	 * current configuration converted to microseconds. Use the
	 * V4L2_CID_EXPOSURE control to get exposure min, max and default and
	 * convert it from lines to microseconds.
	 */
	double lineDuration = sensorInfo.lineLength
			    / (sensorInfo.pixelRate / 1e6);
	const ControlInfoMap &sensorControls = sensor->controls();
	const ControlInfo &v4l2Exposure = sensorControls.find(V4L2_CID_EXPOSURE)->second;
	int32_t minExposure = v4l2Exposure.min().get<int32_t>() * lineDuration;
	int32_t maxExposure = v4l2Exposure.max().get<int32_t>() * lineDuration;
	int32_t defExposure = v4l2Exposure.def().get<int32_t>() * lineDuration;

	/*
	 * \todo Report the actual exposure time, use the default for the
	 * moment.
	 */
	data->exposureTime_ = defExposure;

	controls[&controls::ExposureTime] = ControlInfo(minExposure, maxExposure,
							defExposure);

	/*
	 * Compute the scaler crop limits.
	 *
	 * \todo The scaler crop limits depend on the sensor configuration. It
	 * should be updated when a new configuration is applied. To initialize
	 * the control use the 'Viewfinder' configuration (1280x720) as the
	 * pipeline output resolution and the full sensor size as input frame
	 * (see the todo note in the validate() function about the usage of the
	 * sensor's full frame as ImgU input).
	 */

	/* Re-fetch the sensor info updated to use the largest resolution. */
	V4L2SubdeviceFormat sensorFormat;
	sensorFormat.size = sensor->resolution();
	ret = sensor->setFormat(&sensorFormat);
	if (ret)
		return ret;

	ret = sensor->sensorInfo(&sensorInfo);
	if (ret)
		return ret;

	/*
	 * The maximum scaler crop rectangle is the analogue crop used to
	 * produce the maximum frame size.
	 */
	const Rectangle &analogueCrop = sensorInfo.analogCrop;
	Rectangle maxCrop = analogueCrop;

	/*
	 * As the ImgU cannot up-scale, the minimum selection rectangle has to
	 * be as large as the pipeline output size. Use the default viewfinder
	 * configuration as the desired output size and calculate the minimum
	 * rectangle required to satisfy the ImgU processing margins, unless the
	 * sensor resolution is smaller.
	 *
	 * \todo This implementation is based on the same assumptions about the
	 * ImgU pipeline configuration described in then viewfinder and main
	 * output sizes calculation in the validate() function.
	 */

	/* The strictly smaller size than the sensor resolution, aligned to margins. */
	Size minSize = Size(sensor->resolution().width - 1,
			    sensor->resolution().height - 1)
		       .alignedDownTo(IMGU_OUTPUT_WIDTH_MARGIN,
				      IMGU_OUTPUT_HEIGHT_MARGIN);

	/*
	 * Either the smallest margin-aligned size larger than the viewfinder
	 * size or the adjusted sensor resolution.
	 */
	minSize = Size(IPU3ViewfinderSize.width + 1,
		       IPU3ViewfinderSize.height + 1)
		  .alignedUpTo(IMGU_OUTPUT_WIDTH_MARGIN,
			       IMGU_OUTPUT_HEIGHT_MARGIN)
		  .boundedTo(minSize);

	/*
	 * Re-scale in the sensor's native coordinates. Report (0,0) as
	 * top-left corner as we allow application to freely pan the crop area.
	 */
	Rectangle minCrop = Rectangle(minSize).scaledBy(analogueCrop.size(),
					       sensorInfo.outputSize);

	controls[&controls::ScalerCrop] = ControlInfo(minCrop, maxCrop, maxCrop);

	data->controlInfo_ = std::move(controls);

	return 0;
}

/**
 * \brief Initialise ImgU and CIO2 devices associated with cameras
 *
 * Initialise the two ImgU instances and create cameras with an associated
 * CIO2 device instance.
 *
 * \return 0 on success or a negative error code for error or if no camera
 * has been created
 * \retval -ENODEV no camera has been created
 */
int PipelineHandlerIPU3::registerCameras()
{
	int ret;

	ret = imgu0_.init(imguMediaDev_, 0);
	if (ret)
		return ret;

	ret = imgu1_.init(imguMediaDev_, 1);
	if (ret)
		return ret;

	/*
	 * For each CSI-2 receiver on the IPU3, create a Camera if an
	 * image sensor is connected to it and the sensor can produce images
	 * in a compatible format.
	 */
	unsigned int numCameras = 0;
	for (unsigned int id = 0; id < 4 && numCameras < 2; ++id) {
		std::unique_ptr<IPU3CameraData> data =
			std::make_unique<IPU3CameraData>(this);
		std::set<Stream *> streams = {
			&data->outStream_,
			&data->vfStream_,
			&data->rawStream_,
		};
		CIO2Device *cio2 = &data->cio2_;

		ret = cio2->init(cio2MediaDev_, id);
		if (ret)
			continue;

		ret = data->loadIPA();
		if (ret)
			continue;

		/* Initialize the camera properties. */
		data->properties_ = cio2->sensor()->properties();

		ret = initControls(data.get());
		if (ret)
			continue;

		/*
		 * \todo Read delay values from the sensor itself or from a
		 * a sensor database. For now use generic values taken from
		 * the Raspberry Pi and listed as 'generic values'.
		 */
		std::unordered_map<uint32_t, unsigned int> delays = {
			{ V4L2_CID_ANALOGUE_GAIN, 1 },
			{ V4L2_CID_EXPOSURE, 2 },
		};

		data->delayedCtrls_ =
			std::make_unique<DelayedControls>(cio2->sensor()->device(),
							  delays);
		data->cio2_.frameStart().connect(data->delayedCtrls_.get(),
						 &DelayedControls::applyControls);

		/**
		 * \todo Dynamically assign ImgU and output devices to each
		 * stream and camera; as of now, limit support to two cameras
		 * only, and assign imgu0 to the first one and imgu1 to the
		 * second.
		 */
		data->imgu_ = numCameras ? &imgu1_ : &imgu0_;

		/*
		 * Connect video devices' 'bufferReady' signals to their
		 * slot to implement the image processing pipeline.
		 *
		 * Frames produced by the CIO2 unit are passed to the
		 * associated ImgU input where they get processed and
		 * returned through the ImgU main and secondary outputs.
		 */
		data->cio2_.bufferReady().connect(data.get(),
					&IPU3CameraData::cio2BufferReady);
		data->imgu_->input_->bufferReady.connect(&data->cio2_,
					&CIO2Device::tryReturnBuffer);
		data->imgu_->output_->bufferReady.connect(data.get(),
					&IPU3CameraData::imguOutputBufferReady);
		data->imgu_->viewfinder_->bufferReady.connect(data.get(),
					&IPU3CameraData::imguOutputBufferReady);
		data->imgu_->param_->bufferReady.connect(data.get(),
					&IPU3CameraData::paramBufferReady);
		data->imgu_->stat_->bufferReady.connect(data.get(),
					&IPU3CameraData::statBufferReady);

		/* Create and register the Camera instance. */
		std::string cameraId = cio2->sensor()->id();
		std::shared_ptr<Camera> camera =
			Camera::create(this, cameraId, streams);

		registerCamera(std::move(camera), std::move(data));

		LOG(IPU3, Info)
			<< "Registered Camera[" << numCameras << "] \""
			<< cameraId << "\""
			<< " connected to CSI-2 receiver " << id;

		numCameras++;
	}

	return numCameras ? 0 : -ENODEV;
}

int IPU3CameraData::loadIPA()
{
	ipa_ = IPAManager::createIPA(pipe_, 1, 1);
	if (!ipa_)
		return -ENOENT;

	ipa_->queueFrameAction.connect(this, &IPU3CameraData::queueFrameAction);

	ipa_->init(IPASettings{});

	return 0;
}

void IPU3CameraData::queueFrameAction(unsigned int id,
				      const IPAOperationData &action)
{
	switch (action.operation) {
	case IPU3_IPA_ACTION_SET_SENSOR_CONTROLS: {
		const ControlList &controls = action.controls[0];
		delayedCtrls_->push(controls);
		break;
	}
	case IPU3_IPA_ACTION_PARAM_FILLED: {
		IPU3Frames::Info *info = frameInfos_.find(id);
		if (!info)
			break;

		/* Queue all buffers from the request aimed for the ImgU. */
		for (auto it : info->request->buffers()) {
			const Stream *stream = it.first;
			FrameBuffer *outbuffer = it.second;

			if (stream == &outStream_)
				imgu_->output_->queueBuffer(outbuffer);
			else if (stream == &vfStream_)
				imgu_->viewfinder_->queueBuffer(outbuffer);
		}

		imgu_->param_->queueBuffer(info->paramBuffer);
		imgu_->stat_->queueBuffer(info->statBuffer);
		imgu_->input_->queueBuffer(info->rawBuffer);

		break;
	}
	case IPU3_IPA_ACTION_METADATA_READY: {
		IPU3Frames::Info *info = frameInfos_.find(id);
		if (!info)
			break;

		Request *request = info->request;
		request->metadata() = action.controls[0];
		info->metadataProcessed = true;
		if (frameInfos_.tryComplete(info))
			pipe_->completeRequest(request);

		break;
	}
	default:
		LOG(IPU3, Error) << "Unknown action " << action.operation;
		break;
	}
}

/* -----------------------------------------------------------------------------
 * Buffer Ready slots
 */

/**
 * \brief Handle buffers completion at the ImgU output
 * \param[in] buffer The completed buffer
 *
 * Buffers completed from the ImgU output are directed to the application.
 */
void IPU3CameraData::imguOutputBufferReady(FrameBuffer *buffer)
{
	Request *request = buffer->request();

	pipe_->completeBuffer(request, buffer);

	IPU3Frames::Info *info = frameInfos_.find(buffer);
	if (!info)
		return;

	request->metadata().set(controls::draft::PipelineDepth, 3);
	/* \todo Move the ExposureTime control to the IPA. */
	request->metadata().set(controls::ExposureTime, exposureTime_);
	/* \todo Actually apply the scaler crop region to the ImgU. */
	if (request->controls().contains(controls::ScalerCrop)) {
		Rectangle cropRegion = request->controls().get(controls::ScalerCrop);
		request->metadata().set(controls::ScalerCrop, cropRegion);
	}

	if (buffer->metadata().status == FrameMetadata::FrameCancelled)
		info->metadataProcessed = true;

	if (frameInfos_.tryComplete(info))
		pipe_->completeRequest(request);
}

/**
 * \brief Handle buffers completion at the CIO2 output
 * \param[in] buffer The completed buffer
 *
 * Buffers completed from the CIO2 are immediately queued to the ImgU unit
 * for further processing.
 */
void IPU3CameraData::cio2BufferReady(FrameBuffer *buffer)
{
	IPU3Frames::Info *info = frameInfos_.find(buffer);
	if (!info)
		return;

	Request *request = buffer->request();

	/* If the buffer is cancelled force a complete of the whole request. */
	if (buffer->metadata().status == FrameMetadata::FrameCancelled) {
		for (auto it : request->buffers())
			pipe_->completeBuffer(request, it.second);

		frameInfos_.remove(info);
		pipe_->completeRequest(request);
		return;
	}

	if (request->findBuffer(&rawStream_))
		pipe_->completeBuffer(request, buffer);

	IPAOperationData op;
	op.operation = IPU3_IPA_EVENT_FILL_PARAMS;
	op.data = { info->id, info->paramBuffer->cookie() };
	ipa_->processEvent(op);
}

void IPU3CameraData::paramBufferReady(FrameBuffer *buffer)
{
	IPU3Frames::Info *info = frameInfos_.find(buffer);
	if (!info)
		return;

	info->paramDequeued = true;
	if (frameInfos_.tryComplete(info))
		pipe_->completeRequest(buffer->request());
}

void IPU3CameraData::statBufferReady(FrameBuffer *buffer)
{
	IPU3Frames::Info *info = frameInfos_.find(buffer);
	if (!info)
		return;

	if (buffer->metadata().status == FrameMetadata::FrameCancelled) {
		info->metadataProcessed = true;
		if (frameInfos_.tryComplete(info))
			pipe_->completeRequest(buffer->request());
		return;
	}

	IPAOperationData op;
	op.operation = IPU3_IPA_EVENT_STAT_READY;
	op.data = { info->id, info->statBuffer->cookie() };
	ipa_->processEvent(op);
}

REGISTER_PIPELINE_HANDLER(PipelineHandlerIPU3)

} /* namespace libcamera */