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1 /* | |
2 * libjingle | |
3 * Copyright 2012 Google Inc. | |
4 * | |
5 * Redistribution and use in source and binary forms, with or without | |
6 * modification, are permitted provided that the following conditions are met: | |
7 * | |
8 * 1. Redistributions of source code must retain the above copyright notice, | |
9 * this list of conditions and the following disclaimer. | |
10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
11 * this list of conditions and the following disclaimer in the documentation | |
12 * and/or other materials provided with the distribution. | |
13 * 3. The name of the author may not be used to endorse or promote products | |
14 * derived from this software without specific prior written permission. | |
15 * | |
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 */ | |
27 | |
28 #include "talk/media/devices/deviceinfo.h" | |
29 | |
30 #include "talk/media/devices/libudevsymboltable.h" | |
31 #include "webrtc/base/common.h" // for ASSERT | |
32 | |
33 namespace cricket { | |
34 | |
35 class ScopedLibUdev { | |
36 public: | |
37 static ScopedLibUdev* Create() { | |
38 ScopedLibUdev* ret_val = new ScopedLibUdev(); | |
39 if (!ret_val->Init()) { | |
40 delete ret_val; | |
41 return NULL; | |
42 } | |
43 return ret_val; | |
44 } | |
45 ~ScopedLibUdev() { | |
46 libudev_.Unload(); | |
47 } | |
48 | |
49 LibUDevSymbolTable* instance() { return &libudev_; } | |
50 | |
51 private: | |
52 ScopedLibUdev() {} | |
53 | |
54 bool Init() { | |
55 return libudev_.Load() && | |
56 !IsWrongLibUDevAbiVersion(libudev_.GetDllHandle()); | |
57 } | |
58 | |
59 LibUDevSymbolTable libudev_; | |
60 }; | |
61 | |
62 class ScopedUdev { | |
63 public: | |
64 explicit ScopedUdev(LibUDevSymbolTable* libudev) : libudev_(libudev) { | |
65 udev_ = libudev_->udev_new()(); | |
66 } | |
67 ~ScopedUdev() { | |
68 if (udev_) libudev_->udev_unref()(udev_); | |
69 } | |
70 | |
71 udev* instance() { return udev_; } | |
72 | |
73 private: | |
74 LibUDevSymbolTable* libudev_; | |
75 udev* udev_; | |
76 }; | |
77 | |
78 class ScopedUdevEnumerate { | |
79 public: | |
80 ScopedUdevEnumerate(LibUDevSymbolTable* libudev, udev* udev) | |
81 : libudev_(libudev) { | |
82 enumerate_ = libudev_->udev_enumerate_new()(udev); | |
83 } | |
84 ~ScopedUdevEnumerate() { | |
85 if (enumerate_) libudev_->udev_enumerate_unref()(enumerate_); | |
86 } | |
87 | |
88 udev_enumerate* instance() { return enumerate_; } | |
89 | |
90 private: | |
91 LibUDevSymbolTable* libudev_; | |
92 udev_enumerate* enumerate_; | |
93 }; | |
94 | |
95 bool GetUsbProperty(const Device& device, const char* property_name, | |
96 std::string* property) { | |
97 rtc::scoped_ptr<ScopedLibUdev> libudev_context(ScopedLibUdev::Create()); | |
98 if (!libudev_context) { | |
99 return false; | |
100 } | |
101 ScopedUdev udev_context(libudev_context->instance()); | |
102 if (!udev_context.instance()) { | |
103 return false; | |
104 } | |
105 ScopedUdevEnumerate enumerate_context(libudev_context->instance(), | |
106 udev_context.instance()); | |
107 if (!enumerate_context.instance()) { | |
108 return false; | |
109 } | |
110 libudev_context->instance()->udev_enumerate_add_match_subsystem()( | |
111 enumerate_context.instance(), "video4linux"); | |
112 libudev_context->instance()->udev_enumerate_scan_devices()( | |
113 enumerate_context.instance()); | |
114 udev_list_entry* devices = | |
115 libudev_context->instance()->udev_enumerate_get_list_entry()( | |
116 enumerate_context.instance()); | |
117 if (!devices) { | |
118 return false; | |
119 } | |
120 udev_list_entry* dev_list_entry = NULL; | |
121 const char* property_value = NULL; | |
122 // Macro that expands to a for-loop over the devices. | |
123 for (dev_list_entry = devices; dev_list_entry != NULL; | |
124 dev_list_entry = libudev_context->instance()-> | |
125 udev_list_entry_get_next()(dev_list_entry)) { | |
126 const char* path = libudev_context->instance()->udev_list_entry_get_name()( | |
127 dev_list_entry); | |
128 if (!path) continue; | |
129 udev_device* dev = | |
130 libudev_context->instance()->udev_device_new_from_syspath()( | |
131 udev_context.instance(), path); | |
132 if (!dev) continue; | |
133 const char* device_node = | |
134 libudev_context->instance()->udev_device_get_devnode()(dev); | |
135 if (!device_node || device.id.compare(device_node) != 0) { | |
136 continue; | |
137 } | |
138 dev = libudev_context->instance()-> | |
139 udev_device_get_parent_with_subsystem_devtype()( | |
140 dev, "usb", "usb_device"); | |
141 if (!dev) continue; | |
142 property_value = libudev_context->instance()-> | |
143 udev_device_get_sysattr_value()( | |
144 dev, property_name); | |
145 break; | |
146 } | |
147 if (!property_value) { | |
148 return false; | |
149 } | |
150 property->assign(property_value); | |
151 return true; | |
152 } | |
153 | |
154 bool GetUsbId(const Device& device, std::string* usb_id) { | |
155 std::string id_vendor; | |
156 std::string id_product; | |
157 if (!GetUsbProperty(device, "idVendor", &id_vendor)) { | |
158 return false; | |
159 } | |
160 if (!GetUsbProperty(device, "idProduct", &id_product)) { | |
161 return false; | |
162 } | |
163 usb_id->clear(); | |
164 usb_id->append(id_vendor); | |
165 usb_id->append(":"); | |
166 usb_id->append(id_product); | |
167 return true; | |
168 } | |
169 | |
170 bool GetUsbVersion(const Device& device, std::string* usb_version) { | |
171 return GetUsbProperty(device, "version", usb_version); | |
172 } | |
173 | |
174 } // namespace cricket | |
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