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// 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() : nullptr;
}
} // namespace
AudioStreamMonitor::AudioStreamMonitor(WebContents* contents)
: web_contents_(contents),
clock_(&default_tick_clock_),
was_recently_audible_(false),
is_audible_(false)
{
DCHECK(web_contents_);
}
AudioStreamMonitor::~AudioStreamMonitor() {}
bool AudioStreamMonitor::WasRecentlyAudible() const {
DCHECK(thread_checker_.CalledOnValidThread());
return was_recently_audible_;
}
bool AudioStreamMonitor::IsCurrentlyAudible() const {
DCHECK(thread_checker_.CalledOnValidThread());
return is_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 (!media::AudioOutputController::will_monitor_audio_levels())
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) /
static_cast<int>(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() {
bool was_audible = is_audible_;
is_audible_ = false;
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();
is_audible_ = true;
MaybeToggle();
break; // No need to poll remaining streams.
}
}
if (is_audible_ != was_audible)
web_contents_->NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}
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
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