1 /*
2  * libjingle
3  * Copyright 2005 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 // Class to collect statistics from a media channel
29 
30 #ifndef TALK_SESSION_MEDIA_MEDIAMONITOR_H_
31 #define TALK_SESSION_MEDIA_MEDIAMONITOR_H_
32 
33 #include "talk/media/base/mediachannel.h"
34 #include "webrtc/base/criticalsection.h"
35 #include "webrtc/base/sigslot.h"
36 #include "webrtc/base/thread.h"
37 #include "webrtc/base/thread_annotations.h"
38 
39 namespace cricket {
40 
41 // The base MediaMonitor class, independent of voice and video.
42 class MediaMonitor : public rtc::MessageHandler,
43     public sigslot::has_slots<> {
44  public:
45   MediaMonitor(rtc::Thread* worker_thread,
46                rtc::Thread* monitor_thread);
47   ~MediaMonitor();
48 
49   void Start(uint32_t milliseconds);
50   void Stop();
51 
52  protected:
53   void OnMessage(rtc::Message *message);
54   void PollMediaChannel();
55   virtual void GetStats() = 0;
56   virtual void Update() = 0;
57 
58   rtc::CriticalSection crit_;
59   rtc::Thread* worker_thread_;
60   rtc::Thread* monitor_thread_;
61   bool monitoring_;
62   uint32_t rate_;
63 };
64 
65 // Templatized MediaMonitor that can deal with different kinds of media.
66 template<class MC, class MI>
67 class MediaMonitorT : public MediaMonitor {
68  public:
MediaMonitorT(MC * media_channel,rtc::Thread * worker_thread,rtc::Thread * monitor_thread)69   MediaMonitorT(MC* media_channel, rtc::Thread* worker_thread,
70                 rtc::Thread* monitor_thread)
71       : MediaMonitor(worker_thread, monitor_thread),
72         media_channel_(media_channel) {}
73   sigslot::signal2<MC*, const MI&> SignalUpdate;
74 
75  protected:
76   // These routines assume the crit_ lock is held by the calling thread.
GetStats()77   virtual void GetStats() {
78     media_info_.Clear();
79     media_channel_->GetStats(&media_info_);
80   }
Update()81   virtual void Update() EXCLUSIVE_LOCKS_REQUIRED(crit_) {
82     MI stats(media_info_);
83     crit_.Leave();
84     SignalUpdate(media_channel_, stats);
85     crit_.Enter();
86   }
87 
88  private:
89   MC* media_channel_;
90   MI media_info_;
91 };
92 
93 typedef MediaMonitorT<VoiceMediaChannel, VoiceMediaInfo> VoiceMediaMonitor;
94 typedef MediaMonitorT<VideoMediaChannel, VideoMediaInfo> VideoMediaMonitor;
95 typedef MediaMonitorT<DataMediaChannel, DataMediaInfo> DataMediaMonitor;
96 
97 }  // namespace cricket
98 
99 #endif  // TALK_SESSION_MEDIA_MEDIAMONITOR_H_
100