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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_mixer_cras.h"
#include <cmath>
#include <cras_client.h>
#include <unistd.h>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/threading/thread.h"
#include "base/threading/thread_restrictions.h"
#include "chrome/browser/extensions/extension_tts_api_chromeos.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace chromeos {
namespace {
// Default volume as a percentage in the range [0.0, 100.0].
const double kDefaultVolumePercent = 75.0;
// Number of seconds that we'll sleep between each connection attempt.
const int kConnectionRetrySleepSec = 1;
} // namespace
AudioMixerCras::AudioMixerCras()
: client_(NULL),
client_connected_(false),
volume_percent_(kDefaultVolumePercent),
is_muted_(false),
apply_is_pending_(true) {
}
AudioMixerCras::~AudioMixerCras() {
if (!thread_.get())
return;
DCHECK(MessageLoop::current() != thread_->message_loop());
base::ThreadRestrictions::ScopedAllowIO allow_io_for_thread_join;
thread_->Stop();
thread_.reset();
cras_client_destroy(client_);
}
void AudioMixerCras::Init() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(!thread_.get()) << "Init() called twice";
thread_.reset(new base::Thread("AudioMixerCras"));
CHECK(thread_->Start());
thread_->message_loop()->PostTask(
FROM_HERE, base::Bind(&AudioMixerCras::Connect, base::Unretained(this)));
}
double AudioMixerCras::GetVolumePercent() {
base::AutoLock lock(lock_);
return volume_percent_;
}
void AudioMixerCras::SetVolumePercent(double percent) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (isnan(percent))
percent = 0.0;
percent = std::max(std::min(percent, 100.0), 0.0);
base::AutoLock lock(lock_);
volume_percent_ = percent;
if (client_connected_ && !apply_is_pending_)
thread_->message_loop()->PostTask(FROM_HERE,
base::Bind(&AudioMixerCras::ApplyState, base::Unretained(this)));
}
bool AudioMixerCras::IsMuted() {
base::AutoLock lock(lock_);
return is_muted_;
}
void AudioMixerCras::SetMuted(bool muted) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
base::AutoLock lock(lock_);
is_muted_ = muted;
if (client_connected_ && !apply_is_pending_)
thread_->message_loop()->PostTask(FROM_HERE,
base::Bind(&AudioMixerCras::ApplyState, base::Unretained(this)));
}
void AudioMixerCras::Connect() {
DCHECK(MessageLoop::current() == thread_->message_loop());
// Create the client structure.
if (client_ == NULL && cras_client_create(&client_) < 0) {
LOG(DFATAL) << "cras_client_create() failed";
return; // TODO(dgreid) change interface so this can return an error.
}
if (cras_client_connect(client_) != 0) {
thread_->message_loop()->PostDelayedTask(FROM_HERE,
base::Bind(&AudioMixerCras::Connect, base::Unretained(this)),
kConnectionRetrySleepSec * 1000);
return;
}
client_connected_ = true;
// The speech synthesis service shouldn't be initialized until after
// we get to this point, so we call this function to tell it that it's
// safe to do TTS now. NotificationService would be cleaner,
// but it's not available at this point.
EnableChromeOsTts();
ApplyState();
}
void AudioMixerCras::ApplyState() {
DCHECK(MessageLoop::current() == thread_->message_loop());
if (!client_connected_)
return;
bool should_mute = false;
size_t new_volume = 0;
{
base::AutoLock lock(lock_);
should_mute = is_muted_;
new_volume = floor(volume_percent_ + 0.5);
apply_is_pending_ = false;
}
// If muting mute before setting volume, if un-muting set volume first.
if (should_mute) {
cras_client_set_system_mute(client_, should_mute);
cras_client_set_system_volume(client_, new_volume);
} else {
cras_client_set_system_volume(client_, new_volume);
cras_client_set_system_mute(client_, should_mute);
}
}
} // namespace chromeos
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