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
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* Image Processing Algorithm proxy
*/
#include "libcamera/internal/ipa_proxy.h"
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include "libcamera/internal/ipa_module.h"
/**
* \file ipa_proxy.h
* \brief IPA Proxy
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAProxy)
/**
* \class IPAProxy
* \brief IPA Proxy
*
* Isolate IPA into separate process.
*/
/**
* \enum IPAProxy::ProxyState
* \brief Identifies the available operational states of the proxy
*
* \var IPAProxy::ProxyStopped
* \brief The proxy is not active and only synchronous operations are permitted
* \var IPAProxy::ProxyStopping
* \brief No new tasks can be submitted to the proxy, however existing events
* can be completed
* \var IPAProxy::ProxyRunning
* \brief The Proxy is active and asynchronous tasks may be queued
*/
/**
* \brief Construct an IPAProxy instance
* \param[in] ipam The IPA module
*/
IPAProxy::IPAProxy(IPAModule *ipam)
: valid_(false), state_(ProxyStopped), ipam_(ipam)
{
}
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 Retrieve the absolute path to an IPA configuration file
* \param[in] name The configuration file name
* \param[in] fallbackName The name of a fallback configuration file
*
* This function locates the configuration file for an IPA and returns its
* absolute path. It searches the following directories, in order:
*
* - All directories specified in the colon-separated LIBCAMERA_IPA_CONFIG_PATH
* environment variable ; or
* - If libcamera is not installed, the src/ipa/ directory within the source
* tree ; otherwise
* - The system sysconf (etc/libcamera/ipa) and the data (share/libcamera/ipa/)
* directories.
*
* The system directories are not searched if libcamera is not installed.
*
* Within each of those directories, the function looks for a subdirectory
* named after the IPA module name, as reported in IPAModuleInfo::name, and for
* a file named \a name within that directory. The \a name is IPA-specific.
*
* If the file named \a name is not found and \a fallbackName is non-empty then
* the whole search is repeated for \a fallbackName.
*
* \return The full path to the IPA configuration file, or an empty string if
* no configuration file can be found
*/
std::string IPAProxy::configurationFile(const std::string &name,
const std::string &fallbackName) const
{
struct stat statbuf;
int ret;
/*
* The IPA module name can be used as-is to build directory names as it
* has been validated when loading the module.
*/
std::string ipaName = ipam_->info().name;
/* Check the environment variable first. */
const char *confPaths = utils::secure_getenv("LIBCAMERA_IPA_CONFIG_PATH");
if (confPaths) {
for (const auto &dir : utils::split(confPaths, ":")) {
if (dir.empty())
continue;
std::string confPath = dir + "/" + ipaName + "/" + name;
ret = stat(confPath.c_str(), &statbuf);
if (ret == 0 && (statbuf.st_mode & S_IFMT) == S_IFREG)
return confPath;
}
}
std::string root = utils::libcameraSourcePath();
if (!root.empty()) {
/*
* When libcamera is used before it is installed, load
* configuration files from the source directory. The
* configuration files are then located in the 'data'
* subdirectory of the corresponding IPA module.
*/
std::string ipaConfDir = root + "src/ipa/" + ipaName + "/data";
LOG(IPAProxy, Info)
<< "libcamera is not installed. Loading IPA configuration from '"
<< ipaConfDir << "'";
std::string confPath = ipaConfDir + "/" + name;
ret = stat(confPath.c_str(), &statbuf);
if (ret == 0 && (statbuf.st_mode & S_IFMT) == S_IFREG)
return confPath;
} else {
/* Else look in the system locations. */
for (const auto &dir : utils::split(IPA_CONFIG_DIR, ":")) {
std::string confPath = dir + "/" + ipaName + "/" + name;
ret = stat(confPath.c_str(), &statbuf);
if (ret == 0 && (statbuf.st_mode & S_IFMT) == S_IFREG)
return confPath;
}
}
if (fallbackName.empty()) {
LOG(IPAProxy, Error)
<< "Configuration file '" << name
<< "' not found for IPA module '" << ipaName << "'";
return std::string();
}
LOG(IPAProxy, Warning)
<< "Configuration file '" << name
<< "' not found for IPA module '" << ipaName
<< "', falling back to '" << fallbackName << "'";
return configurationFile(fallbackName);
}
/**
* \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 function 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.
*/
/**
* \var IPAProxy::state_
* \brief Current state of the IPAProxy
*
* The IPAProxy can be Running, Stopped, or Stopping.
*
* This state provides a means to ensure that asynchronous functions are only
* called while the proxy is running, and prevent new tasks being submitted
* while still enabling events to complete when the IPAProxy is stopping.
*/
} /* namespace libcamera */
|
