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