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path: root/utils/raspberrypi/ctt/ctt_config_example.json

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2020, Ideas on Board Oy.
 *
 * A simple libcamera capture example
 */

#include <iomanip>
#include <iostream>
#include <memory>

#include <libcamera/libcamera.h>

#include "event_loop.h"

#define TIMEOUT_SEC 3

using namespace libcamera;
std::shared_ptr<Camera> camera;
EventLoop loop;

/*
 * --------------------------------------------------------------------
 * Handle RequestComplete
 *
 * For each Camera::requestCompleted Signal emitted from the Camera the
 * connected Slot is invoked.
 *
 * The Slot is invoked in the CameraManager's thread, hence one should avoid
 * any heavy processing here. The processing of the request shall be re-directed
 * to the application's thread instead, so as not to block the CameraManager's
 * thread for large amount of time.
 *
 * The Slot receives the Request as a parameter.
 */

static void processRequest(Request *request);

static void requestComplete(Request *request)
{
	if (request->status() == Request::RequestCancelled)
		return;

	loop.callLater(std::bind(&processRequest, request));
}

static void processRequest(Request *request)
{
	const Request::BufferMap &buffers = request->buffers();

	for (auto bufferPair : buffers) {
		// (Unused) Stream *stream = bufferPair.first;
		FrameBuffer *buffer = bufferPair.second;
		const FrameMetadata &metadata = buffer->metadata();

		/* Print some information about the buffer which has completed. */
		std::cout << " seq: " << std::setw(6) << std::setfill('0') << metadata.sequence
			  << " bytesused: ";

		unsigned int nplane = 0;
		for (const FrameMetadata::Plane &plane : metadata.planes())
		{
			std::cout << plane.bytesused;
			if (++nplane < metadata.planes().size())
				std::cout << "/";
		}

		std::cout << std::endl;

		/*
		 * Image data can be accessed here, but the FrameBuffer
		 * must be mapped by the application
		 */
	}

	/* Re-queue the Request to the camera. */
	request->reuse(Request::ReuseBuffers);
	camera->queueRequest(request);
}

/*
 * ----------------------------------------------------------------------------
 * Camera Naming.
 *
 * Applications are responsible for deciding how to name cameras, and present
 * that information to the users. Every camera has a unique identifier, though
 * this string is not designed to be friendly for a human reader.
 *
 * To support human consumable names, libcamera provides camera properties
 * that allow an application to determine a naming scheme based on its needs.
 *
 * In this example, we focus on the location property, but also detail the
 * model string for external cameras, as this is more likely to be visible
 * information to the user of an externally connected device.
 *
 * The unique camera ID is appended for informative purposes.
 */
std::string cameraName(Camera *camera)
{
	const ControlList &props = camera->properties();
	std::string name;

	switch (props.get(properties::Location)) {
	case properties::CameraLocationFront:
		name = "Internal front camera";
		break;
	case properties::CameraLocationBack:
		name = "Internal back camera";
		break;
	case properties::CameraLocationExternal:
		name = "External camera";
		if (props.contains(properties::Model))
			name += " '" + props.get(properties::Model) + "'";
		break;
	}

	name += " (" + camera->id() + ")";

	return name;
}

int main()
{
	/*
	 * --------------------------------------------------------------------
	 * Create a Camera Manager.
	 *
	 * The Camera Manager is responsible for enumerating all the Camera
	 * in the system, by associating Pipeline Handlers with media entities
	 * registered in the system.
	 *
	 * The CameraManager provides a list of available Cameras that
	 * applications can operate on.
	 *
	 * When the CameraManager is no longer to be used, it should be deleted.
	 * We use a unique_ptr here to manage the lifetime automatically during
	 * the scope of this function.
	 *
	 * There can only be a single CameraManager constructed within any
	 * process space.
	 */
	std::unique_ptr<CameraManager> cm = std::make_unique<CameraManager>();
	cm->start();

	/*
	 * Just as a test, generate names of the Cameras registered in the
	 * system, and list them.
	 */
	for (auto const &camera : cm->cameras())
		std::cout << " - " << cameraName(camera.get()) << std::endl;

	/*
	 * --------------------------------------------------------------------
	 * Camera
	 *
	 * Camera are entities created by pipeline handlers, inspecting the
	 * entities registered in the system and reported to applications
	 * by the CameraManager.
	 *
	 * In general terms, a Camera corresponds to a single image source
	 * available in the system, such as an image sensor.
	 *
	 * Application lock usage of Camera by 'acquiring' them.
	 * Once done with it, application shall similarly 'release' the Camera.
	 *
	 * As an example, use the first available camera in the system.
	 *
	 * Cameras can be obtained by their ID or their index, to demonstrate
	 * this, the following code gets the ID of the first camera; then gets
	 * the camera associated with that ID (which is of course the same as
	 * cm->cameras()[0]).
	 */
	std::string cameraId = cm->cameras()[0]->id();
	camera = cm->get(cameraId);
	camera->acquire();

	/*
	 * Stream
	 *
	 * Each Camera supports a variable number of Stream. A Stream is
	 * produced by processing data produced by an image source, usually
	 * by an ISP.
	 *
	 *   +-------------------------------------------------------+
	 *   | Camera                                                |
	 *   |                +-----------+                          |
	 *   | +--------+     |           |------> [  Main output  ] |
	 *   | | Image  |     |           |                          |
	 *   | |        |---->|    ISP    |------> [   Viewfinder  ] |
	 *   | | Source |     |           |                          |
	 *   | +--------+     |           |------> [ Still Capture ] |
	 *   |                +-----------+                          |


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