1 /*
2  * libjingle
3  * Copyright 2009 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 /*
29  * Author: lexnikitin@google.com (Alexey Nikitin)
30  *
31  * V4LLookup provides basic functionality to work with V2L2 devices in Linux
32  * The functionality is implemented as a class with virtual methods for
33  * the purpose of unit testing.
34  */
35 #ifndef TALK_MEDIA_DEVICES_V4LLOOKUP_H_
36 #define TALK_MEDIA_DEVICES_V4LLOOKUP_H_
37 
38 #include <string>
39 
40 #ifdef WEBRTC_LINUX
41 namespace cricket {
42 class V4LLookup {
43  public:
~V4LLookup()44   virtual ~V4LLookup() {}
45 
IsV4L2Device(const std::string & device_path)46   static bool IsV4L2Device(const std::string& device_path) {
47     return GetV4LLookup()->CheckIsV4L2Device(device_path);
48   }
49 
SetV4LLookup(V4LLookup * v4l_lookup)50   static void SetV4LLookup(V4LLookup* v4l_lookup) {
51     v4l_lookup_ = v4l_lookup;
52   }
53 
GetV4LLookup()54   static V4LLookup* GetV4LLookup() {
55     if (!v4l_lookup_) {
56       v4l_lookup_ = new V4LLookup();
57     }
58     return v4l_lookup_;
59   }
60 
61  protected:
62   static V4LLookup* v4l_lookup_;
63   // Making virtual so it is easier to mock
64   virtual bool CheckIsV4L2Device(const std::string& device_path);
65 };
66 
67 }  // namespace cricket
68 
69 #endif  // WEBRTC_LINUX
70 #endif  // TALK_MEDIA_DEVICES_V4LLOOKUP_H_
71