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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_MAC_AUDIO_MANAGER_MAC_H_
#define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
#include <CoreAudio/AudioHardware.h>
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/message_loop/message_loop_proxy.h"
#include "media/audio/audio_manager_base.h"
#include "media/audio/mac/aggregate_device_manager.h"
#include "media/audio/mac/audio_device_listener_mac.h"
namespace media {
// Mac OS X implementation of the AudioManager singleton. This class is internal
// to the audio output and only internal users can call methods not exposed by
// the AudioManager class.
class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
public:
AudioManagerMac();
// Implementation of AudioManager.
virtual bool HasAudioOutputDevices() OVERRIDE;
virtual bool HasAudioInputDevices() OVERRIDE;
virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
OVERRIDE;
virtual void GetAudioOutputDeviceNames(media::AudioDeviceNames* device_names)
OVERRIDE;
virtual AudioParameters GetInputStreamParameters(
const std::string& device_id) OVERRIDE;
virtual std::string GetAssociatedOutputDeviceID(
const std::string& input_device_id) OVERRIDE;
// Implementation of AudioManagerBase.
virtual AudioOutputStream* MakeLinearOutputStream(
const AudioParameters& params) OVERRIDE;
virtual AudioOutputStream* MakeLowLatencyOutputStream(
const AudioParameters& params,
const std::string& device_id,
const std::string& input_device_id) OVERRIDE;
virtual AudioInputStream* MakeLinearInputStream(
const AudioParameters& params, const std::string& device_id) OVERRIDE;
virtual AudioInputStream* MakeLowLatencyInputStream(
const AudioParameters& params, const std::string& device_id) OVERRIDE;
virtual std::string GetDefaultOutputDeviceID() OVERRIDE;
static bool GetDefaultInputDevice(AudioDeviceID* device);
static bool GetDefaultOutputDevice(AudioDeviceID* device);
static bool GetDefaultDevice(AudioDeviceID* device, bool input);
static bool GetDefaultOutputChannels(int* channels);
static bool GetDeviceChannels(AudioDeviceID device,
AudioObjectPropertyScope scope,
int* channels);
static int HardwareSampleRateForDevice(AudioDeviceID device_id);
static int HardwareSampleRate();
// Notify streams of a device change if the default output device or its
// sample rate has changed, otherwise does nothing.
void HandleDeviceChanges();
protected:
virtual ~AudioManagerMac();
virtual AudioParameters GetPreferredOutputStreamParameters(
const std::string& output_device_id,
const AudioParameters& input_params) OVERRIDE;
private:
bool HasUnifiedDefaultIO();
// Helper methods for constructing AudioDeviceListenerMac on the audio thread.
void CreateDeviceListener();
void DestroyDeviceListener();
scoped_ptr<AudioDeviceListenerMac> output_device_listener_;
// Track the output sample-rate and the default output device
// so we can intelligently handle device notifications only when necessary.
int current_sample_rate_;
AudioDeviceID current_output_device_;
AggregateDeviceManager aggregate_device_manager_;
DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
};
} // namespace media
#endif // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
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