1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "content/browser/media/audio_stream_monitor.h" 6 7 #include "base/bind.h" 8 #include "base/bind_helpers.h" 9 #include "content/browser/web_contents/web_contents_impl.h" 10 #include "content/public/browser/browser_thread.h" 11 #include "content/public/browser/invalidate_type.h" 12 #include "content/public/browser/render_frame_host.h" 13 14 namespace content { 15 16 namespace { 17 18 AudioStreamMonitor* AudioStreamMonitorFromRenderFrame(int render_process_id, 19 int render_frame_id) { 20 DCHECK_CURRENTLY_ON(BrowserThread::UI); 21 WebContentsImpl* const web_contents = 22 static_cast<WebContentsImpl*>(WebContents::FromRenderFrameHost( 23 RenderFrameHost::FromID(render_process_id, render_frame_id))); 24 return web_contents ? web_contents->audio_stream_monitor() : NULL; 25 } 26 27 } // namespace 28 29 AudioStreamMonitor::AudioStreamMonitor(WebContents* contents) 30 : web_contents_(contents), 31 clock_(&default_tick_clock_), 32 was_recently_audible_(false) { 33 DCHECK(web_contents_); 34 } 35 36 AudioStreamMonitor::~AudioStreamMonitor() {} 37 38 bool AudioStreamMonitor::WasRecentlyAudible() const { 39 DCHECK(thread_checker_.CalledOnValidThread()); 40 return was_recently_audible_; 41 } 42 43 // static 44 void AudioStreamMonitor::StartMonitoringStream( 45 int render_process_id, 46 int render_frame_id, 47 int stream_id, 48 const ReadPowerAndClipCallback& read_power_callback) { 49 if (!monitoring_available()) 50 return; 51 BrowserThread::PostTask(BrowserThread::UI, 52 FROM_HERE, 53 base::Bind(&StartMonitoringHelper, 54 render_process_id, 55 render_frame_id, 56 stream_id, 57 read_power_callback)); 58 } 59 60 // static 61 void AudioStreamMonitor::StopMonitoringStream(int render_process_id, 62 int render_frame_id, 63 int stream_id) { 64 if (!monitoring_available()) 65 return; 66 BrowserThread::PostTask(BrowserThread::UI, 67 FROM_HERE, 68 base::Bind(&StopMonitoringHelper, 69 render_process_id, 70 render_frame_id, 71 stream_id)); 72 } 73 74 // static 75 void AudioStreamMonitor::StartMonitoringHelper( 76 int render_process_id, 77 int render_frame_id, 78 int stream_id, 79 const ReadPowerAndClipCallback& read_power_callback) { 80 DCHECK_CURRENTLY_ON(BrowserThread::UI); 81 AudioStreamMonitor* const monitor = 82 AudioStreamMonitorFromRenderFrame(render_process_id, render_frame_id); 83 if (monitor) { 84 monitor->StartMonitoringStreamOnUIThread( 85 render_process_id, stream_id, read_power_callback); 86 } 87 } 88 89 // static 90 void AudioStreamMonitor::StopMonitoringHelper(int render_process_id, 91 int render_frame_id, 92 int stream_id) { 93 DCHECK_CURRENTLY_ON(BrowserThread::UI); 94 AudioStreamMonitor* const monitor = 95 AudioStreamMonitorFromRenderFrame(render_process_id, render_frame_id); 96 if (monitor) 97 monitor->StopMonitoringStreamOnUIThread(render_process_id, stream_id); 98 } 99 100 void AudioStreamMonitor::StartMonitoringStreamOnUIThread( 101 int render_process_id, 102 int stream_id, 103 const ReadPowerAndClipCallback& read_power_callback) { 104 DCHECK(thread_checker_.CalledOnValidThread()); 105 DCHECK(!read_power_callback.is_null()); 106 poll_callbacks_[StreamID(render_process_id, stream_id)] = read_power_callback; 107 if (!poll_timer_.IsRunning()) { 108 poll_timer_.Start( 109 FROM_HERE, 110 base::TimeDelta::FromSeconds(1) / kPowerMeasurementsPerSecond, 111 base::Bind(&AudioStreamMonitor::Poll, base::Unretained(this))); 112 } 113 } 114 115 void AudioStreamMonitor::StopMonitoringStreamOnUIThread(int render_process_id, 116 int stream_id) { 117 DCHECK(thread_checker_.CalledOnValidThread()); 118 poll_callbacks_.erase(StreamID(render_process_id, stream_id)); 119 if (poll_callbacks_.empty()) 120 poll_timer_.Stop(); 121 } 122 123 void AudioStreamMonitor::Poll() { 124 for (StreamPollCallbackMap::const_iterator it = poll_callbacks_.begin(); 125 it != poll_callbacks_.end(); 126 ++it) { 127 // TODO(miu): A new UI for delivering specific power level and clipping 128 // information is still in the works. For now, we throw away all 129 // information except for "is it audible?" 130 const float power_dbfs = it->second.Run().first; 131 const float kSilenceThresholdDBFS = -72.24719896f; 132 if (power_dbfs >= kSilenceThresholdDBFS) { 133 last_blurt_time_ = clock_->NowTicks(); 134 MaybeToggle(); 135 break; // No need to poll remaining streams. 136 } 137 } 138 } 139 140 void AudioStreamMonitor::MaybeToggle() { 141 const bool indicator_was_on = was_recently_audible_; 142 const base::TimeTicks off_time = 143 last_blurt_time_ + base::TimeDelta::FromMilliseconds(kHoldOnMilliseconds); 144 const base::TimeTicks now = clock_->NowTicks(); 145 const bool should_indicator_be_on = now < off_time; 146 147 if (should_indicator_be_on != indicator_was_on) { 148 was_recently_audible_ = should_indicator_be_on; 149 web_contents_->NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB); 150 } 151 152 if (!should_indicator_be_on) { 153 off_timer_.Stop(); 154 } else if (!off_timer_.IsRunning()) { 155 off_timer_.Start( 156 FROM_HERE, 157 off_time - now, 158 base::Bind(&AudioStreamMonitor::MaybeToggle, base::Unretained(this))); 159 } 160 } 161 162 } // namespace content 163