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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <AudioUnit/AudioUnit.h>
#include <CoreAudio/AudioHardware.h>
#include <stddef.h>
#include <list>
#include <map>
#include <memory>
#include <string>
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "media/audio/audio_manager_base.h"
#include "media/audio/mac/audio_device_listener_mac.h"
namespace media {
class AUAudioInputStream;
class AUHALStream;
// 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(std::unique_ptr<AudioThread> audio_thread,
AudioLogFactory* audio_log_factory);
AudioManagerMac(const AudioManagerMac&) = delete;
AudioManagerMac& operator=(const AudioManagerMac&) = delete;
~AudioManagerMac() override;
// Implementation of AudioManager.
bool HasAudioOutputDevices() override;
bool HasAudioInputDevices() override;
void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
AudioParameters GetInputStreamParameters(
const std::string& device_id) override;
std::string GetAssociatedOutputDeviceID(
const std::string& input_device_id) override;
const char* GetName() override;
// Implementation of AudioManagerBase.
AudioOutputStream* MakeLinearOutputStream(
const AudioParameters& params,
const LogCallback& log_callback) override;
AudioOutputStream* MakeLowLatencyOutputStream(
const AudioParameters& params,
const std::string& device_id,
const LogCallback& log_callback) override;
AudioInputStream* MakeLinearInputStream(
const AudioParameters& params,
const std::string& device_id,
const LogCallback& log_callback) override;
AudioInputStream* MakeLowLatencyInputStream(
const AudioParameters& params,
const std::string& device_id,
const LogCallback& log_callback) override;
std::string GetDefaultInputDeviceID() override;
std::string GetDefaultOutputDeviceID() override;
// Used to track destruction of input and output streams.
void ReleaseOutputStream(AudioOutputStream* stream) override;
void ReleaseInputStream(AudioInputStream* stream) override;
// Called by AUHALStream::Close() before releasing the stream.
// This method is a special contract between the real stream and the audio
// manager and it ensures that we only try to increase the IO buffer size
// for real streams and not for fake or mocked streams.
void ReleaseOutputStreamUsingRealDevice(AudioOutputStream* stream,
AudioDeviceID device_id);
static int HardwareSampleRateForDevice(AudioDeviceID device_id);
static int HardwareSampleRate();
static bool GetDefaultOutputDevice(AudioDeviceID* device);
static AudioDeviceID GetAudioDeviceIdByUId(bool is_input,
const std::string& device_id);
// OSX has issues with starting streams as the system 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.
// TODO(henrika): track UMA statistics related to defer start to come up with
// a suitable delay value.
enum { kStartDelayInSecsForPowerEvents = 5 };
bool ShouldDeferStreamStart() const;
// True if the device is on battery power.
bool IsOnBatteryPower() const;
// Number of times the device has resumed from power suspension.
size_t GetNumberOfResumeNotifications() const;
// True if the device is suspending.
bool IsSuspending() const;
// Changes the I/O buffer size for |device_id| if |desired_buffer_size| is
// lower than the current device buffer size. The buffer size can also be
// modified under other conditions. See comments in the corresponding cc-file
// for more details.
// |size_was_changed| is set to true if the device's buffer size was changed
// and |io_buffer_frame_size| contains the new buffer size.
// Returns false if an error occurred.
bool MaybeChangeBufferSize(AudioDeviceID device_id,
AudioUnit audio_unit,
AudioUnitElement element,
size_t desired_buffer_size,
bool* size_was_changed,
size_t* io_buffer_frame_size);
// Returns the latency for the given audio unit and device. Total latency is
// the sum of the latency of the AudioUnit, device, and stream. If any one
// component of the latency can't be retrieved it is considered as zero.
static base::TimeDelta GetHardwareLatency(AudioUnit audio_unit,
AudioDeviceID device_id,
AudioObjectPropertyScope scope,
int sample_rate);
// Number of constructed output and input streams.
size_t output_streams() const { return output_streams_.size(); }
size_t low_latency_input_streams() const {
return low_latency_input_streams_.size();
size_t basic_input_streams() const { return basic_input_streams_.size(); }
bool DeviceSupportsAmbientNoiseReduction(AudioDeviceID device_id);
bool SuppressNoiseReduction(AudioDeviceID device_id);
void UnsuppressNoiseReduction(AudioDeviceID device_id);
// The state of a single device for which we've tried to disable Ambient Noise
// Reduction. If the device initially has ANR enabled, it will be turned off
// as the suppression count goes from 0 to 1 and turned on again as the count
// returns to 0.
struct NoiseReductionState {
enum State { DISABLED, ENABLED };
State initial_state = DISABLED;
int suppression_count = 0;
// Keep track of the devices that we've changed the Ambient Noise Reduction
// setting on.
std::map<AudioDeviceID, NoiseReductionState> device_noise_reduction_states_;
AudioParameters GetPreferredOutputStreamParameters(
const std::string& output_device_id,
const AudioParameters& input_params) override;
void ShutdownOnAudioThread() override;
void InitializeOnAudioThread();
int ChooseBufferSize(bool is_input, int sample_rate);
// Notify streams of a device change if the default output device or its
// sample rate has changed, otherwise does nothing.
void HandleDeviceChanges();
// Returns true if any active input stream is using the specified |device_id|.
bool AudioDeviceIsUsedForInput(AudioDeviceID device_id);
std::string GetDefaultDeviceID(bool is_input);
std::unique_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;
std::unique_ptr<AudioPowerObserver> power_observer_;
// Tracks all constructed input and output streams.
// TODO(alokp): We used to track these streams to close before destruction.
// We no longer close the streams, so we may be able to get rid of these
// member variables. They are currently used by MaybeChangeBufferSize().
// Investigate if we can remove these.
std::list<AudioInputStream*> basic_input_streams_;
std::list<AUAudioInputStream*> low_latency_input_streams_;
std::list<AUHALStream*> output_streams_;
// Set to true in the destructor. Ensures that methods that touches native
// Core Audio APIs are not executed during shutdown.
bool in_shutdown_;
base::WeakPtrFactory<AudioManagerMac> weak_ptr_factory_;
} // namespace media