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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* ipa_proxy.cpp - Image Processing Algorithm proxy
*/
#include "ipa_proxy.h"
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "utils.h"
#include <iostream>
/**
* \file ipa_proxy.h
* \brief IPA Proxy
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAProxy)
/**
* \class IPAProxy
* \brief IPA Proxy
*
* Isolate IPA into separate process.
*
* Every subclass of proxy shall be registered with libcamera using
* the REGISTER_IPA_PROXY() macro.
*/
/**
* \brief Construct an IPAProxy instance
*
* IPAProxy instances shall be constructed through the IPAProxyFactory::create()
* method implemented by the respective factories.
*/
IPAProxy::IPAProxy()
: valid_(false)
{
}
IPAProxy::~IPAProxy()
{
}
/**
* \fn IPAProxy::isValid()
* \brief Check if the IPAProxy instance is valid
*
* An IPAProxy instance is valid if the IPA interface is successfully created in
* isolation, and IPC is successfully set up.
*
* \return True if the IPAProxy is valid, false otherwise
*/
/**
* \brief Find a valid full path for a proxy worker for a given executable name
* \param[in] file File name of proxy worker executable
*
* A proxy worker's executable could be found in either the global installation
* directory, or in the paths specified by the environment variable
* LIBCAMERA_IPA_PROXY_PATH. This method checks the global install directory
* first, then LIBCAMERA_IPA_PROXY_PATH in order, and returns the full path to
* the proxy worker executable that is specified by file. The proxy worker
* executable shall have exec permission.
*
* \return The full path to the proxy worker executable, or an empty string if
* no valid executable path
*/
std::string IPAProxy::resolvePath(const std::string &file) const
{
std::string proxyFile = "/" + file;
/* Check env variable first. */
const char *execPaths = utils::secure_getenv("LIBCAMERA_IPA_PROXY_PATH");
if (execPaths) {
for (const auto &dir : utils::split(execPaths, ":")) {
if (dir.empty())
continue;
std::string proxyPath = dir;
proxyPath += proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
}
}
/*
* When libcamera is used before it is installed, load proxy workers
* from the same build directory as the libcamera directory itself.
* This requires identifying the path of the libcamera.so, and
* referencing a relative path for the proxy workers from that point.
*/
std::string root = utils::libcameraBuildPath();
if (!root.empty()) {
std::string ipaProxyDir = root + "src/libcamera/proxy/worker";
LOG(IPAProxy, Info)
<< "libcamera is not installed. Loading proxy workers from '"
<< ipaProxyDir << "'";
std::string proxyPath = ipaProxyDir + proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
return std::string();
}
/* Else try finding the exec target from the install directory. */
std::string proxyPath = std::string(IPA_PROXY_DIR) + proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
return std::string();
}
/**
* \var IPAProxy::valid_
* \brief Flag to indicate if the IPAProxy instance is valid
*
* A IPAProxy instance is valid if the IPA interface is successfully created in
* isolation, and IPC is successfully set up.
*
* This flag can be read via IPAProxy::isValid().
*
* Implementations of the IPAProxy class should set this flag upon successful
* construction.
*/
/**
* \class IPAProxyFactory
* \brief Registration of IPAProxy classes and creation of instances
*
* To facilitate discovery and instantiation of IPAProxy classes, the
* IPAProxyFactory class maintains a registry of IPAProxy classes. Each
* IPAProxy subclass shall register itself using the REGISTER_IPA_PROXY()
* macro, which will create a corresponding instance of a IPAProxyFactory
* subclass and register it with the static list of factories.
*/
/**
* \brief Construct a IPAProxy factory
* \param[in] name Name of the IPAProxy class
*
* Creating an instance of the factory registers is with the global list of
* factories, accessible through the factories() function.
*
* The factory \a name is used for debugging and IPAProxy matching purposes
* and shall be unique.
*/
IPAProxyFactory::IPAProxyFactory(const char *name)
: name_(name)
{
registerType(this);
}
/**
* \fn IPAProxyFactory::create()
* \brief Create an instance of the IPAProxy corresponding to the factory
* \param[in] ipam The IPA module
*
* This virtual function is implemented by the REGISTER_IPA_PROXY() macro.
* It creates a IPAProxy instance that isolates an IPA interface designated
* by the IPA module \a ipam.
*
* \return A pointer to a newly constructed instance of the IPAProxy subclass
* corresponding to the factory
*/
/**
* \fn IPAProxyFactory::name()
* \brief Retrieve the factory name
* \return The factory name
*/
/**
* \brief Add a IPAProxy class to the registry
* \param[in] factory Factory to use to construct the IPAProxy
*
* The caller is responsible to guarantee the uniqueness of the IPAProxy name.
*/
void IPAProxyFactory::registerType(IPAProxyFactory *factory)
{
std::vector<IPAProxyFactory *> &factories = IPAProxyFactory::factories();
factories.push_back(factory);
LOG(IPAProxy, Debug)
<< "Registered proxy \"" << factory->name() << "\"";
}
/**
* \brief Retrieve the list of all IPAProxy factories
*
* The static factories map is defined inside the function to ensure it gets
* initialized on first use, without any dependency on link order.
*
* \return The list of pipeline handler factories
*/
std::vector<IPAProxyFactory *> &IPAProxyFactory::factories()
{
static std::vector<IPAProxyFactory *> factories;
return factories;
}
/**
* \def REGISTER_IPA_PROXY
* \brief Register a IPAProxy with the IPAProxy factory
* \param[in] proxy Class name of IPAProxy derived class to register
*
* Register a proxy subclass with the factory and make it available to
* isolate IPA modules.
*/
} /* namespace libcamera */
|
