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// Copyright (c) 2012 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/chromeos/audio/audio_handler.h"
#include <algorithm>
#include <cmath>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "chrome/browser/browser_process.h"
#if defined(USE_CRAS)
#include "chrome/browser/chromeos/audio/audio_mixer_cras.h"
#else
#include "chrome/browser/chromeos/audio/audio_mixer_alsa.h"
#endif
#include "chrome/browser/prefs/pref_registry_simple.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/pref_names.h"
using std::max;
using std::min;
namespace chromeos {
namespace {
// Default value for the volume pref, as a percent in the range [0.0, 100.0].
const double kDefaultVolumePercent = 75.0;
// Default value for unmuting, as a percent in the range [0.0, 100.0].
// Used when sound is unmuted, but volume was less than kMuteThresholdPercent.
const double kDefaultUnmuteVolumePercent = 4.0;
// Volume value which should be considered as muted in range [0.0, 100.0].
const double kMuteThresholdPercent = 1.0;
// Values used for muted preference.
const int kPrefMuteOff = 0;
const int kPrefMuteOn = 1;
static AudioHandler* g_audio_handler = NULL;
} // namespace
// static
void AudioHandler::Initialize() {
CHECK(!g_audio_handler);
#if defined(USE_CRAS)
g_audio_handler = new AudioHandler(new AudioMixerCras());
#else
g_audio_handler = new AudioHandler(new AudioMixerAlsa());
#endif
}
// static
void AudioHandler::Shutdown() {
// We may call Shutdown without calling Initialize, e.g. if we exit early.
if (g_audio_handler) {
delete g_audio_handler;
g_audio_handler = NULL;
}
}
// static
void AudioHandler::InitializeForTesting(AudioMixer* mixer) {
CHECK(!g_audio_handler);
g_audio_handler = new AudioHandler(mixer);
}
// static
AudioHandler* AudioHandler::GetInstance() {
VLOG_IF(1, !g_audio_handler)
<< "AudioHandler::GetInstance() called with NULL global instance.";
return g_audio_handler;
}
// static
void AudioHandler::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterDoublePref(prefs::kAudioVolumePercent,
kDefaultVolumePercent);
registry->RegisterIntegerPref(prefs::kAudioMute, kPrefMuteOff);
// Register the prefs backing the audio muting policies.
registry->RegisterBooleanPref(prefs::kAudioOutputAllowed, true);
// This pref has moved to the media subsystem but we should verify it is there
// before we use it.
registry->RegisterBooleanPref(prefs::kAudioCaptureAllowed, true);
}
double AudioHandler::GetVolumePercent() {
return mixer_->GetVolumePercent();
}
void AudioHandler::SetVolumePercent(double volume_percent) {
volume_percent = min(max(volume_percent, 0.0), 100.0);
if (volume_percent <= kMuteThresholdPercent)
volume_percent = 0.0;
if (IsMuted() && volume_percent > 0.0)
SetMuted(false);
if (!IsMuted() && volume_percent == 0.0)
SetMuted(true);
SetVolumePercentInternal(volume_percent);
}
void AudioHandler::SetVolumePercentInternal(double volume_percent) {
mixer_->SetVolumePercent(volume_percent);
local_state_->SetDouble(prefs::kAudioVolumePercent, volume_percent);
FOR_EACH_OBSERVER(VolumeObserver, volume_observers_, OnVolumeChanged());
}
void AudioHandler::AdjustVolumeByPercent(double adjust_by_percent) {
SetVolumePercent(mixer_->GetVolumePercent() + adjust_by_percent);
}
bool AudioHandler::IsMuted() {
return mixer_->IsMuted();
}
void AudioHandler::SetMuted(bool mute) {
if (!mixer_->IsMuteLocked()) {
mixer_->SetMuted(mute);
local_state_->SetInteger(prefs::kAudioMute,
mute ? kPrefMuteOn : kPrefMuteOff);
if (!mute) {
if (GetVolumePercent() <= kMuteThresholdPercent) {
// Avoid the situation when sound has been unmuted, but the volume
// is set to a very low value, so user still can't hear any sound.
SetVolumePercentInternal(kDefaultUnmuteVolumePercent);
}
}
FOR_EACH_OBSERVER(VolumeObserver, volume_observers_, OnMuteToggled());
}
}
bool AudioHandler::IsCaptureMuted() {
return mixer_->IsCaptureMuted();
}
void AudioHandler::SetCaptureMuted(bool mute) {
if (!mixer_->IsCaptureMuteLocked())
mixer_->SetCaptureMuted(mute);
}
void AudioHandler::AddVolumeObserver(VolumeObserver* observer) {
volume_observers_.AddObserver(observer);
}
void AudioHandler::RemoveVolumeObserver(VolumeObserver* observer) {
volume_observers_.RemoveObserver(observer);
}
AudioHandler::AudioHandler(AudioMixer* mixer)
: mixer_(mixer),
local_state_(g_browser_process->local_state()) {
InitializePrefObservers();
mixer_->Init();
ApplyAudioPolicy();
SetMuted(local_state_->GetInteger(prefs::kAudioMute) == kPrefMuteOn);
SetVolumePercentInternal(local_state_->GetDouble(prefs::kAudioVolumePercent));
}
AudioHandler::~AudioHandler() {
mixer_.reset();
};
void AudioHandler::InitializePrefObservers() {
pref_change_registrar_.Init(local_state_);
base::Closure callback = base::Bind(&AudioHandler::ApplyAudioPolicy,
base::Unretained(this));
pref_change_registrar_.Add(prefs::kAudioOutputAllowed, callback);
pref_change_registrar_.Add(prefs::kAudioCaptureAllowed, callback);
}
void AudioHandler::ApplyAudioPolicy() {
mixer_->SetMuteLocked(false);
if (local_state_->GetBoolean(prefs::kAudioOutputAllowed)) {
mixer_->SetMuted(
local_state_->GetInteger(prefs::kAudioMute) == kPrefMuteOn);
} else {
mixer_->SetMuted(true);
mixer_->SetMuteLocked(true);
}
FOR_EACH_OBSERVER(VolumeObserver, volume_observers_, OnMuteToggled());
mixer_->SetCaptureMuteLocked(false);
if (local_state_->GetBoolean(prefs::kAudioCaptureAllowed)) {
mixer_->SetCaptureMuted(false);
} else {
mixer_->SetCaptureMuted(true);
mixer_->SetCaptureMuteLocked(true);
}
}
} // namespace chromeos
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