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
39namespace cricket {
40
41// The base MediaMonitor class, independent of voice and video.
42class 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 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 rate_;
63};
64
65// Templatized MediaMonitor that can deal with different kinds of media.
66template<class MC, class MI>
67class MediaMonitorT : public MediaMonitor {
68 public:
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.
77  virtual void GetStats() {
78    media_info_.Clear();
79    media_channel_->GetStats(&media_info_);
80  }
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
93typedef MediaMonitorT<VoiceMediaChannel, VoiceMediaInfo> VoiceMediaMonitor;
94typedef MediaMonitorT<VideoMediaChannel, VideoMediaInfo> VideoMediaMonitor;
95typedef MediaMonitorT<DataMediaChannel, DataMediaInfo> DataMediaMonitor;
96
97}  // namespace cricket
98
99#endif  // TALK_SESSION_MEDIA_MEDIAMONITOR_H_
100