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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.
#ifndef CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_CRAS_H_
#define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_CRAS_H_
#pragma once
#include <cras_client.h>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread.h"
#include "chrome/browser/chromeos/audio/audio_mixer.h"
namespace chromeos {
// Simple wrapper for sending volume and mute commands to the audio server on
// ChromeOS. Interaction happens on a background thread so that initialization
// can poll until the server is started.
class AudioMixerCras : public AudioMixer {
public:
AudioMixerCras();
virtual ~AudioMixerCras();
// AudioMixer implementation.
virtual void Init() OVERRIDE;
virtual double GetVolumePercent() OVERRIDE;
virtual void SetVolumePercent(double percent) OVERRIDE;
virtual bool IsMuted() OVERRIDE;
virtual void SetMuted(bool muted) OVERRIDE;
private:
// Tries to connect to CRAS. On failure, posts a delayed Connect() task to
// try again. Failure could occur if the CRAS server isn't running yet.
void Connect();
// Updates |client_| for current values of |volume_percent_| and
// |is_muted_|. No-op if not connected.
void ApplyState();
// Interfaces to the audio server.
struct cras_client *client_;
// Indicates if we have connected |client_| to the server.
bool client_connected_;
// Most recently-requested volume, in percent. This variable is updated
// immediately by SetVolumePercent() (post-initialization); the actual mixer
// volume is updated later on |thread_| by ApplyState().
double volume_percent_;
// Most recently-requested muting state.
bool is_muted_;
// Is there already a pending call to ApplyState() scheduled on |thread_|?
bool apply_is_pending_;
// Background thread used for interacting with CRAS.
scoped_ptr<base::Thread> thread_;
// Guards |volume_percent_|, |is_muted_|, and |apply_is_pending_|.
base::Lock lock_;
DISALLOW_COPY_AND_ASSIGN(AudioMixerCras);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_CRAS_H_
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