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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 <CoreAudio/AudioHardware.h>
#include <list>
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "media/audio/audio_manager_base.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 {
AudioManagerMac(AudioLogFactory* audio_log_factory);
// Implementation of AudioManager.
virtual bool HasAudioOutputDevices() OVERRIDE;
virtual bool HasAudioInputDevices() OVERRIDE;
virtual void GetAudioInputDeviceNames(
AudioDeviceNames* device_names) OVERRIDE;
virtual void GetAudioOutputDeviceNames(
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) 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;
// Used to track destruction of input and output streams.
virtual void ReleaseOutputStream(AudioOutputStream* stream) OVERRIDE;
virtual void ReleaseInputStream(AudioInputStream* stream) 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();
// OSX has issues with starting streams as the sytem goes into suspend and
// immediately after it wakes up from resume. See
// As a workaround we delay Start() when it occurs after suspend and for a
// small amount of time after resume.
// Streams should consult ShouldDeferStreamStart() and if true check the value
// again after |kStartDelayInSecsForPowerEvents| has elapsed. If false, the
// stream may be started immediately.
enum { kStartDelayInSecsForPowerEvents = 1 };
bool ShouldDeferStreamStart();
virtual ~AudioManagerMac();
virtual AudioParameters GetPreferredOutputStreamParameters(
const std::string& output_device_id,
const AudioParameters& input_params) OVERRIDE;
void InitializeOnAudioThread();
void ShutdownOnAudioThread();
int ChooseBufferSize(int output_sample_rate);
// Notify streams of a device change if the default output device or its
// sample rate has changed, otherwise does nothing.
void HandleDeviceChanges();
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_;
// Helper class which monitors power events to determine if output streams
// should defer Start() calls. Required to workaround an OSX bug. See
// for more details.
class AudioPowerObserver;
scoped_ptr<AudioPowerObserver> power_observer_;
// Tracks all constructed input and output streams so they can be stopped at
// shutdown. See ShutdownOnAudioThread() for more details.
std::list<AudioInputStream*> input_streams_;
std::list<AudioOutputStream*> output_streams_;
} // namespace media