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      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 
     33 namespace cricket {
     34 
     35 enum {
     36   MSG_MONITOR_POLL = 1,
     37   MSG_MONITOR_START = 2,
     38   MSG_MONITOR_STOP = 3,
     39   MSG_MONITOR_SIGNAL = 4
     40 };
     41 
     42 MediaMonitor::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 
     48 MediaMonitor::~MediaMonitor() {
     49   monitoring_ = false;
     50   monitor_thread_->Clear(this);
     51   worker_thread_->Clear(this);
     52 }
     53 
     54 void MediaMonitor::Start(uint32 milliseconds) {
     55   rate_ = milliseconds;
     56   if (rate_ < 100)
     57     rate_ = 100;
     58   worker_thread_->Post(this, MSG_MONITOR_START);
     59 }
     60 
     61 void MediaMonitor::Stop() {
     62   worker_thread_->Post(this, MSG_MONITOR_STOP);
     63   rate_ = 0;
     64 }
     65 
     66 void 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 
     98 void 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