1/*
2 * libjingle
3 * Copyright 2005--2007, 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/base/common.h"
29#include "talk/session/phone/mediamonitor.h"
30#include "talk/session/phone/channelmanager.h"
31#include "talk/session/phone/mediaengine.h"
32
33namespace cricket {
34
35enum {
36  MSG_MONITOR_POLL = 1,
37  MSG_MONITOR_START = 2,
38  MSG_MONITOR_STOP = 3,
39  MSG_MONITOR_SIGNAL = 4
40};
41
42MediaMonitor::MediaMonitor(talk_base::Thread* worker_thread,
43                           talk_base::Thread* monitor_thread)
44    : worker_thread_(worker_thread),
45      monitor_thread_(monitor_thread), monitoring_(false), rate_(0) {
46}
47
48MediaMonitor::~MediaMonitor() {
49  monitoring_ = false;
50  monitor_thread_->Clear(this);
51  worker_thread_->Clear(this);
52}
53
54void MediaMonitor::Start(uint32 milliseconds) {
55  rate_ = milliseconds;
56  if (rate_ < 100)
57    rate_ = 100;
58  worker_thread_->Post(this, MSG_MONITOR_START);
59}
60
61void MediaMonitor::Stop() {
62  worker_thread_->Post(this, MSG_MONITOR_STOP);
63  rate_ = 0;
64}
65
66void MediaMonitor::OnMessage(talk_base::Message* message) {
67  talk_base::CritScope cs(&crit_);
68
69  switch (message->message_id) {
70  case MSG_MONITOR_START:
71    ASSERT(talk_base::Thread::Current() == worker_thread_);
72    if (!monitoring_) {
73      monitoring_ = true;
74      PollMediaChannel();
75    }
76    break;
77
78  case MSG_MONITOR_STOP:
79    ASSERT(talk_base::Thread::Current() == worker_thread_);
80    if (monitoring_) {
81      monitoring_ = false;
82      worker_thread_->Clear(this);
83    }
84    break;
85
86  case MSG_MONITOR_POLL:
87    ASSERT(talk_base::Thread::Current() == worker_thread_);
88    PollMediaChannel();
89    break;
90
91  case MSG_MONITOR_SIGNAL:
92    ASSERT(talk_base::Thread::Current() == monitor_thread_);
93    Update();
94    break;
95  }
96}
97
98void MediaMonitor::PollMediaChannel() {
99  talk_base::CritScope cs(&crit_);
100  ASSERT(talk_base::Thread::Current() == worker_thread_);
101
102  GetStats();
103
104  // Signal the monitoring thread, start another poll timer
105  monitor_thread_->Post(this, MSG_MONITOR_SIGNAL);
106  worker_thread_->PostDelayed(rate_, this, MSG_MONITOR_POLL);
107}
108
109}
110