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