1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Ideas On Board
*
* algorithm.cpp - IPA control algorithm interface
*/
#include "algorithm.h"
/**
* \file algorithm.h
* \brief Algorithm common interface
*/
namespace libcamera {
namespace ipa {
/**
* \class Algorithm
* \brief The base class for all IPA algorithms
* \tparam Module The IPA module type for this class of algorithms
*
* The Algorithm class defines a standard interface for IPA algorithms
* compatible with the \a Module. By abstracting algorithms, it makes possible
* the implementation of generic code to manage algorithms regardless of their
* specific type.
*
* To specialize the Algorithm class template, an IPA module shall specialize
* the Module class template with module-specific context and configuration
* types, and pass the specialized Module class as the \a Module template
* argument.
*/
/**
* \typedef Algorithm::Module
* \brief The IPA module type for this class of algorithms
*/
/**
* \fn Algorithm::init()
* \brief Initialize the Algorithm with tuning data
* \param[in] context The shared IPA context
* \param[in] tuningData The tuning data for the algorithm
*
* This function is called once, when the IPA module is initialized, to
* initialize the algorithm. The \a tuningData YamlObject contains the tuning
* data for algorithm.
*
* \return 0 if successful, an error code otherwise
*/
/**
* \fn Algorithm::configure()
* \brief Configure the Algorithm given an IPAConfigInfo
* \param[in] context The shared IPA context
* \param[in] configInfo The IPA configuration data, received from the pipeline
* handler
*
* Algorithms may implement a configure operation to pre-calculate
* parameters prior to commencing streaming.
*
* Configuration state may be stored in the IPASessionConfiguration structure of
* the IPAContext.
*
* \return 0 if successful, an error code otherwise
*/
/**
* \fn Algorithm::prepare()
* \brief Fill the \a params buffer with ISP processing parameters for a frame
* \param[in] context The shared IPA context
* \param[out] params The ISP specific parameters.
*
* This function is called for every frame when the camera is running before it
* is processed by the ISP to prepare the ISP processing parameters for that
* frame.
*
* Algorithms shall fill in the parameter structure fields appropriately to
* configure the ISP processing blocks that they are responsible for. This
* includes setting fields and flags that enable those processing blocks.
*/
/**
* \fn Algorithm::process()
* \brief Process ISP statistics, and run algorithm operations
* \param[in] context The shared IPA context
* \param[in] frameContext The current frame's context
* \param[in] stats The IPA statistics and ISP results
*
* This function is called while camera is running for every frame processed by
* the ISP, to process statistics generated from that frame by the ISP.
* Algorithms shall use this data to run calculations and update their state
* accordingly.
*
* Processing shall not take an undue amount of time, and any extended or
* computationally expensive calculations or operations must be handled
* asynchronously in a separate thread.
*
* Algorithms can store state in their respective IPAFrameContext structures,
* and reference state from the IPAFrameContext of other algorithms.
*
* \todo Historical data may be required as part of the processing.
* Either the previous frame, or the IPAFrameContext state of the frame
* that generated the statistics for this operation may be required for
* some advanced algorithms to prevent oscillations or support control
* loops correctly. Only a single IPAFrameContext is available currently,
* and so any data stored may represent the results of the previously
* completed operations.
*
* Care shall be taken to ensure the ordering of access to the information
* such that the algorithms use up to date state as required.
*/
/**
* \class AlgorithmFactory
* \brief Registration of Algorithm classes and creation of instances
* \tparam _Algorithm The algorithm class type for this factory
*
* To facilitate instantiation of Algorithm classes, the AlgorithmFactory class
* implements auto-registration of algorithms with the IPA Module class. Each
* Algorithm subclass shall register itself using the REGISTER_IPA_ALGORITHM()
* macro, which will create a corresponding instance of an AlgorithmFactory and
* register it with the IPA Module.
*/
/**
* \fn AlgorithmFactory::AlgorithmFactory()
* \brief Construct an algorithm factory
* \param[in] name Name of the algorithm class
*
* Creating an instance of the factory automatically registers is with the IPA
* Module class, enabling creation of algorithm instances through
* Module::createAlgorithm().
*
* The factory \a name identifies the algorithm and shall be unique.
*/
/**
* \fn AlgorithmFactory::create()
* \brief Create an instance of the Algorithm corresponding to the factory
* \return A pointer to a newly constructed instance of the Algorithm subclass
* corresponding to the factory
*/
/**
* \def REGISTER_IPA_ALGORITHM
* \brief Register an algorithm with the IPA module
* \param[in] algorithm Class name of Algorithm derived class to register
* \param[in] name Name of the algorithm
*
* Register an Algorithm subclass with the IPA module to make it available for
* instantiation through Module::createAlgorithm(). The \a name identifies the
* algorithm and must be unique across all algorithms registered for the IPA
* module.
*/
} /* namespace ipa */
} /* namespace libcamera */
|
