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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 MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
#define MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
#include <map>
#include "base/atomic_ref_count.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/synchronization/lock.h"
#include "media/audio/audio_manager.h"
class AudioOutputDispatcher;
namespace base {
class Thread;
}
// AudioManagerBase provides AudioManager functions common for all platforms.
class MEDIA_EXPORT AudioManagerBase : public AudioManager {
public:
// Name of the generic "default" device.
static const char kDefaultDeviceName[];
// Unique Id of the generic "default" device.
static const char kDefaultDeviceId[];
AudioManagerBase();
#ifndef NDEBUG
// Overridden to make sure we don't accidentally get added reference counts on
// the audio thread. The AudioManagerBase instance must always be deleted
// from outside the audio thread.
virtual void AddRef() const OVERRIDE;
virtual void Release() const OVERRIDE;
#endif
virtual void Init() OVERRIDE;
virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoop() OVERRIDE;
virtual string16 GetAudioInputDeviceModel() OVERRIDE;
virtual bool CanShowAudioInputSettings() OVERRIDE;
virtual void ShowAudioInputSettings() OVERRIDE;
virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
OVERRIDE;
virtual AudioOutputStream* MakeAudioOutputStreamProxy(
const AudioParameters& params) OVERRIDE;
virtual bool IsRecordingInProcess() OVERRIDE;
void IncreaseActiveInputStreamCount();
void DecreaseActiveInputStreamCount();
// Shuts down the audio thread and releases all the audio output dispatchers
// on the audio thread. All AudioOutputProxy instances should be freed before
// Shutdown is called.
void Shutdown();
protected:
virtual ~AudioManagerBase();
typedef std::map<AudioParameters, scoped_refptr<AudioOutputDispatcher>,
AudioParameters::Compare>
AudioOutputDispatchersMap;
void ShutdownOnAudioThread();
// Thread used to interact with AudioOutputStreams created by this
// audio manger.
scoped_ptr<base::Thread> audio_thread_;
mutable base::Lock audio_thread_lock_;
// Map of cached AudioOutputDispatcher instances. Must only be touched
// from the audio thread (no locking).
AudioOutputDispatchersMap output_dispatchers_;
// Counts the number of active input streams to find out if something else
// is currently recording in Chrome.
base::AtomicRefCount num_active_input_streams_;
DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
};
#endif // MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
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