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// Copyright (c) 2010 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_handler.h"
#include <math.h>
#include "base/logging.h"
#include "chrome/browser/chromeos/pulse_audio_mixer.h"
namespace chromeos {
namespace {
const double kSilenceDb = -200.0;
const double kMinVolumeDb = -90.0;
// Choosing 6.0dB here instead of 0dB to give user chance to amplify audio some
// in case sounds or their setup is too quiet for them.
const double kMaxVolumeDb = 6.0;
// A value of less than one adjusts quieter volumes in larger steps (giving
// finer resolution in the higher volumes).
const double kVolumeBias = 0.5;
// If a connection is lost, we try again this many times
const int kMaxReconnectTries = 4;
} // namespace
// This class will set volume using PulseAudio to adjust volume and mute, and
// handles the volume level logic.
// TODO(davej): Serialize volume/mute for next startup?
double AudioHandler::GetVolumePercent() {
if (!VerifyMixerConnection())
return 0;
return VolumeDbToPercent(mixer_->GetVolumeDb());
}
// Set volume using our internal 0-100% range. Notice 0% is a special case of
// silence, so we set the mixer volume to kSilenceDb instead of kMinVolumeDb.
void AudioHandler::SetVolumePercent(double volume_percent) {
if (!VerifyMixerConnection())
return;
DCHECK(volume_percent >= 0.0);
double vol_db;
if (volume_percent <= 0)
vol_db = kSilenceDb;
else
vol_db = PercentToVolumeDb(volume_percent);
mixer_->SetVolumeDb(vol_db);
}
void AudioHandler::AdjustVolumeByPercent(double adjust_by_percent) {
if (!VerifyMixerConnection())
return;
DVLOG(1) << "Adjusting Volume by " << adjust_by_percent << " percent";
double volume = mixer_->GetVolumeDb();
double pct = VolumeDbToPercent(volume);
if (pct < 0)
pct = 0;
pct = pct + adjust_by_percent;
if (pct > 100.0)
pct = 100.0;
double new_volume;
if (pct <= 0.1)
new_volume = kSilenceDb;
else
new_volume = PercentToVolumeDb(pct);
if (new_volume != volume)
mixer_->SetVolumeDb(new_volume);
}
bool AudioHandler::IsMute() {
if (!VerifyMixerConnection())
return false;
return mixer_->IsMute();
}
void AudioHandler::SetMute(bool do_mute) {
if (!VerifyMixerConnection())
return;
DVLOG(1) << "Setting Mute to " << do_mute;
mixer_->SetMute(do_mute);
}
void AudioHandler::OnMixerInitialized(bool success) {
connected_ = success;
DVLOG(1) << "OnMixerInitialized, success = " << success;
}
AudioHandler::AudioHandler()
: connected_(false),
reconnect_tries_(0) {
mixer_.reset(new PulseAudioMixer());
if (!mixer_->Init(NewCallback(this, &AudioHandler::OnMixerInitialized))) {
LOG(ERROR) << "Unable to connect to PulseAudio";
}
}
AudioHandler::~AudioHandler() {
mixer_.reset();
};
bool AudioHandler::VerifyMixerConnection() {
PulseAudioMixer::State mixer_state = mixer_->CheckState();
if (mixer_state == PulseAudioMixer::READY)
return true;
if (connected_) {
// Something happened and the mixer is no longer valid after having been
// initialized earlier.
connected_ = false;
LOG(ERROR) << "Lost connection to PulseAudio";
} else {
LOG(ERROR) << "Mixer not valid";
}
if ((mixer_state == PulseAudioMixer::INITIALIZING) ||
(mixer_state == PulseAudioMixer::SHUTTING_DOWN))
return false;
if (reconnect_tries_ < kMaxReconnectTries) {
reconnect_tries_++;
VLOG(1) << "Re-connecting to PulseAudio attempt " << reconnect_tries_ << "/"
<< kMaxReconnectTries;
mixer_.reset(new PulseAudioMixer());
connected_ = mixer_->InitSync();
if (connected_) {
reconnect_tries_ = 0;
return true;
}
LOG(ERROR) << "Unable to re-connect to PulseAudio";
}
return false;
}
// VolumeDbToPercent() and PercentToVolumeDb() conversion functions allow us
// complete control over how the 0 to 100% range is mapped to actual loudness.
// Volume range is from kMinVolumeDb at just above 0% to kMaxVolumeDb at 100%
// with a special case at 0% which maps to kSilenceDb.
//
// The mapping is confined to these two functions to make it easy to adjust and
// have everything else just work. The range is biased to give finer resolution
// in the higher volumes if kVolumeBias is less than 1.0.
// static
double AudioHandler::VolumeDbToPercent(double volume_db) {
if (volume_db < kMinVolumeDb)
return 0;
return 100.0 * pow((volume_db - kMinVolumeDb) /
(kMaxVolumeDb - kMinVolumeDb), 1/kVolumeBias);
}
// static
double AudioHandler::PercentToVolumeDb(double volume_percent) {
return pow(volume_percent / 100.0, kVolumeBias) *
(kMaxVolumeDb - kMinVolumeDb) + kMinVolumeDb;
}
} // namespace chromeos
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