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Unified Diff: chrome/browser/media/audio_stream_monitor.cc

Issue 562863002: Gardening: Revert "Use AudioStreamMonitor to control power save blocking." (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 3 months ago
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Index: chrome/browser/media/audio_stream_monitor.cc
diff --git a/chrome/browser/media/audio_stream_monitor.cc b/chrome/browser/media/audio_stream_monitor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8633053d510684d1a69143590ec9d3047eb44194
--- /dev/null
+++ b/chrome/browser/media/audio_stream_monitor.cc
@@ -0,0 +1,86 @@
+// 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 "chrome/browser/media/audio_stream_monitor.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "content/public/browser/invalidate_type.h"
+#include "content/public/browser/web_contents.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(AudioStreamMonitor);
+
+AudioStreamMonitor::AudioStreamMonitor(content::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_;
+}
+
+void AudioStreamMonitor::StartMonitoringStream(
+ int stream_id,
+ const ReadPowerAndClipCallback& read_power_callback) {
+ DCHECK(thread_checker_.CalledOnValidThread());
+ DCHECK(!read_power_callback.is_null());
+ poll_callbacks_[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::StopMonitoringStream(int stream_id) {
+ DCHECK(thread_checker_.CalledOnValidThread());
+ poll_callbacks_.erase(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(content::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)));
+ }
+}
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