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      1 /*
      2  * libjingle
      3  * Copyright 2004 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 <assert.h>
     29 #include "talk/session/media/audiomonitor.h"
     30 #include "talk/session/media/voicechannel.h"
     31 
     32 namespace cricket {
     33 
     34 const uint32_t MSG_MONITOR_POLL = 1;
     35 const uint32_t MSG_MONITOR_START = 2;
     36 const uint32_t MSG_MONITOR_STOP = 3;
     37 const uint32_t MSG_MONITOR_SIGNAL = 4;
     38 
     39 AudioMonitor::AudioMonitor(VoiceChannel *voice_channel,
     40                            rtc::Thread *monitor_thread) {
     41   voice_channel_ = voice_channel;
     42   monitoring_thread_ = monitor_thread;
     43   monitoring_ = false;
     44 }
     45 
     46 AudioMonitor::~AudioMonitor() {
     47   voice_channel_->worker_thread()->Clear(this);
     48   monitoring_thread_->Clear(this);
     49 }
     50 
     51 void AudioMonitor::Start(int milliseconds) {
     52   rate_ = milliseconds;
     53   if (rate_ < 100)
     54     rate_ = 100;
     55   voice_channel_->worker_thread()->Post(this, MSG_MONITOR_START);
     56 }
     57 
     58 void AudioMonitor::Stop() {
     59   voice_channel_->worker_thread()->Post(this, MSG_MONITOR_STOP);
     60 }
     61 
     62 void AudioMonitor::OnMessage(rtc::Message *message) {
     63   rtc::CritScope cs(&crit_);
     64 
     65   switch (message->message_id) {
     66   case MSG_MONITOR_START:
     67     assert(rtc::Thread::Current() == voice_channel_->worker_thread());
     68     if (!monitoring_) {
     69       monitoring_ = true;
     70       PollVoiceChannel();
     71     }
     72     break;
     73 
     74   case MSG_MONITOR_STOP:
     75     assert(rtc::Thread::Current() == voice_channel_->worker_thread());
     76     if (monitoring_) {
     77       monitoring_ = false;
     78       voice_channel_->worker_thread()->Clear(this);
     79     }
     80     break;
     81 
     82   case MSG_MONITOR_POLL:
     83     assert(rtc::Thread::Current() == voice_channel_->worker_thread());
     84     PollVoiceChannel();
     85     break;
     86 
     87   case MSG_MONITOR_SIGNAL:
     88     {
     89       assert(rtc::Thread::Current() == monitoring_thread_);
     90       AudioInfo info = audio_info_;
     91       crit_.Leave();
     92       SignalUpdate(this, info);
     93       crit_.Enter();
     94     }
     95     break;
     96   }
     97 }
     98 
     99 void AudioMonitor::PollVoiceChannel() {
    100   rtc::CritScope cs(&crit_);
    101   assert(rtc::Thread::Current() == voice_channel_->worker_thread());
    102 
    103   // Gather connection infos
    104   audio_info_.input_level = voice_channel_->GetInputLevel_w();
    105   audio_info_.output_level = voice_channel_->GetOutputLevel_w();
    106   voice_channel_->GetActiveStreams_w(&audio_info_.active_streams);
    107 
    108   // Signal the monitoring thread, start another poll timer
    109   monitoring_thread_->Post(this, MSG_MONITOR_SIGNAL);
    110   voice_channel_->worker_thread()->PostDelayed(rate_, this, MSG_MONITOR_POLL);
    111 }
    112 
    113 VoiceChannel *AudioMonitor::voice_channel() {
    114   return voice_channel_;
    115 }
    116 
    117 rtc::Thread *AudioMonitor::monitor_thread() {
    118   return monitoring_thread_;
    119 }
    120 
    121 }
    122