libcamera/vivid.git - libcamera pipeline handler for VIVID

path: root/src/gstreamer/gstlibcamerapad.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2018, Google Inc.
 *
 * device_enumerator.cpp - Enumeration and matching
 */

#include "libcamera/internal/device_enumerator.h"

#include <string.h>

#include <libcamera/base/log.h>

#include "libcamera/internal/device_enumerator_sysfs.h"
#include "libcamera/internal/device_enumerator_udev.h"
#include "libcamera/internal/media_device.h"

/**
 * \file device_enumerator.h
 * \brief Enumeration and matching of media devices
 *
 * The purpose of device enumeration and matching is to find media devices in
 * the system and map them to pipeline handlers.
 *
 * At the core of the enumeration is the DeviceEnumerator class, responsible
 * for enumerating all media devices in the system. It handles all interactions
 * with the operating system in a platform-specific way. For each media device
 * found an instance of MediaDevice is created to store information about the
 * device gathered from the kernel through the Media Controller API.
 *
 * The DeviceEnumerator can enumerate all or specific media devices in the
 * system. When a new media device is added the enumerator creates a
 * corresponding MediaDevice instance.
 *
 * The enumerator supports searching among enumerated devices based on criteria
 * expressed in a DeviceMatch object.
 */

namespace libcamera {

LOG_DEFINE_CATEGORY(DeviceEnumerator)

/**
 * \class DeviceMatch
 * \brief Description of a media device search pattern
 *
 * The DeviceMatch class describes a media device using properties from the
 * Media Controller struct media_device_info, entity names in the media graph
 * or other properties that can be used to identify a media device.
 *
 * The description is meant to be filled by pipeline managers and passed to a
 * device enumerator to find matching media devices.
 *
 * A DeviceMatch is created with a specific Linux device driver in mind,
 * therefore the name of the driver is a required property. One or more Entity
 * names can be added as match criteria.
 *
 * Pipeline handlers are recommended to add entities to DeviceMatch as
 * appropriare to ensure that the media device they need can be uniquely
 * identified. This is useful when the corresponding kernel driver can produce
 * different graphs, for instance as a result of different driver versions or
 * hardware configurations, and not all those graphs are suitable for a pipeline
 * handler.
 */

/**
 * \brief Construct a media device search pattern
 * \param[in] driver The Linux device driver name that created the media device
 */
DeviceMatch::DeviceMatch(const std::string &driver)
	: driver_(driver)
{
}

/**
 * \brief Add a media entity name to the search pattern
 * \param[in] entity The name of the entity in the media graph
 */


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