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// Copyright (c) 2013 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 <queue>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "chromeos/audio/audio_device.h"
#include "chromeos/audio/audio_pref_observer.h"
#include "chromeos/dbus/audio_node.h"
#include "chromeos/dbus/cras_audio_client.h"
#include "chromeos/dbus/session_manager_client.h"
#include "chromeos/dbus/volume_state.h"
class PrefRegistrySimple;
class PrefService;
namespace chromeos {
class AudioDevicesPrefHandler;
class CHROMEOS_EXPORT CrasAudioHandler : public CrasAudioClient::Observer,
public AudioPrefObserver,
public SessionManagerClient::Observer {
typedef std::priority_queue<AudioDevice,
AudioDeviceCompare> AudioDevicePriorityQueue;
typedef std::vector<uint64> NodeIdList;
class AudioObserver {
// Called when output volume changed.
virtual void OnOutputVolumeChanged();
// Called when output mute state changed.
virtual void OnOutputMuteChanged();
// Called when input mute state changed.
virtual void OnInputGainChanged();
// Called when input mute state changed.
virtual void OnInputMuteChanged();
// Called when audio nodes changed.
virtual void OnAudioNodesChanged();
// Called when active audio node changed.
virtual void OnActiveOutputNodeChanged();
// Called when active audio input node changed.
virtual void OnActiveInputNodeChanged();
virtual ~AudioObserver();
// Sets the global instance. Must be called before any calls to Get().
static void Initialize(
scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler);
// Sets the global instance for testing.
static void InitializeForTesting();
// Destroys the global instance.
static void Shutdown();
// Returns true if the global instance is initialized.
static bool IsInitialized();
// Gets the global instance. Initialize must be called first.
static CrasAudioHandler* Get();
// Adds an audio observer.
virtual void AddAudioObserver(AudioObserver* observer);
// Removes an audio observer.
virtual void RemoveAudioObserver(AudioObserver* observer);
// Returns true if keyboard mic exists.
virtual bool HasKeyboardMic();
// Returns true if audio output is muted for the system.
virtual bool IsOutputMuted();
// Returns true if audio output is muted for a device.
virtual bool IsOutputMutedForDevice(uint64 device_id);
// Returns true if audio input is muted.
virtual bool IsInputMuted();
// Returns true if audio input is muted for a device.
virtual bool IsInputMutedForDevice(uint64 device_id);
// Returns true if the output volume is below the default mute volume level.
virtual bool IsOutputVolumeBelowDefaultMuteLevel();
// Returns volume level in 0-100% range at which the volume should be muted.
virtual int GetOutputDefaultVolumeMuteThreshold();
// Gets volume level in 0-100% range (0 being pure silence) for the current
// active node.
virtual int GetOutputVolumePercent();
// Gets volume level in 0-100% range (0 being pure silence) for a device.
virtual int GetOutputVolumePercentForDevice(uint64 device_id);
// Gets gain level in 0-100% range (0 being pure silence) for the current
// active node.
virtual int GetInputGainPercent();
// Gets volume level in 0-100% range (0 being pure silence) for a device.
virtual int GetInputGainPercentForDevice(uint64 device_id);
// Returns node_id of the primary active output node.
virtual uint64 GetPrimaryActiveOutputNode() const;
// Returns the node_id of the primary active input node.
virtual uint64 GetPrimaryActiveInputNode() const;
// Gets the audio devices back in |device_list|.
virtual void GetAudioDevices(AudioDeviceList* device_list) const;
virtual bool GetPrimaryActiveOutputDevice(AudioDevice* device) const;
// Whether there is alternative input/output audio device.
virtual bool has_alternative_input() const;
virtual bool has_alternative_output() const;
// Sets all active output devices' volume level to |volume_percent|, whose
// range is from 0-100%.
virtual void SetOutputVolumePercent(int volume_percent);
// Sets all active input devices' gain level to |gain_percent|, whose range is
// from 0-100%.
virtual void SetInputGainPercent(int gain_percent);
// Adjusts all active output devices' volume up (positive percentage) or down
// (negative percentage).
virtual void AdjustOutputVolumeByPercent(int adjust_by_percent);
// Adjusts all active output devices' volume to a minimum audible level if it
// is too low.
virtual void AdjustOutputVolumeToAudibleLevel();
// Mutes or unmutes audio output device.
virtual void SetOutputMute(bool mute_on);
// Mutes or unmutes audio input device.
virtual void SetInputMute(bool mute_on);
// Switches active audio device to |device|.
virtual void SwitchToDevice(const AudioDevice& device, bool notify);
// Sets volume/gain level for a device.
virtual void SetVolumeGainPercentForDevice(uint64 device_id, int value);
// Sets the mute for device.
virtual void SetMuteForDevice(uint64 device_id, bool mute_on);
// Activates or deactivates keyboard mic if there's one.
virtual void SetKeyboardMicActive(bool active);
// Changes the active nodes to the nodes specified by |new_active_ids|.
// The caller can pass in the "complete" active node list of either input
// nodes, or output nodes, or both. If only input nodes are passed in,
// it will only change the input nodes' active status, output nodes will NOT
// be changed; similarly for the case if only output nodes are passed.
// If the nodes specified in |new_active_ids| are already active, they will
// remain active. Otherwise, the old active nodes will be de-activated before
// we activate the new nodes with the same type(input/output).
virtual void ChangeActiveNodes(const NodeIdList& new_active_ids);
// Swaps the left and right channel of the internal speaker.
// Swap the left and right channel if |swap| is true; otherwise, swap the left
// and right channel back to the normal mode.
// If the feature is not supported on the device, nothing happens.
virtual void SwapInternalSpeakerLeftRightChannel(bool swap);
// Enables error logging.
virtual void LogErrors();
explicit CrasAudioHandler(
scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler);
virtual ~CrasAudioHandler();
friend class CrasAudioHandlerTest;
// CrasAudioClient::Observer overrides.
virtual void AudioClientRestarted() override;
virtual void NodesChanged() override;
virtual void ActiveOutputNodeChanged(uint64 node_id) override;
virtual void ActiveInputNodeChanged(uint64 node_id) override;
// AudioPrefObserver overrides.
virtual void OnAudioPolicyPrefChanged() override;
// SessionManagerClient::Observer overrides.
virtual void EmitLoginPromptVisibleCalled() override;
// Sets the active audio output/input node to the node with |node_id|.
// If |notify|, notifies Active*NodeChange.
void SetActiveOutputNode(uint64 node_id, bool notify);
void SetActiveInputNode(uint64 node_id, bool notify);
// Sets up the audio device state based on audio policy and audio settings
// saved in prefs.
void SetupAudioInputState();
void SetupAudioOutputState();
// Sets up the additional active audio node's state.
void SetupAdditionalActiveAudioNodeState(uint64 node_id);
const AudioDevice* GetDeviceFromId(uint64 device_id) const;
const AudioDevice* GetKeyboardMic() const;
// Initializes audio state, which should only be called when CrasAudioHandler
// is created or cras audio client is restarted.
void InitializeAudioState();
// Applies the audio muting policies whenever the user logs in or policy
// change notification is received.
void ApplyAudioPolicy();
// Sets output volume of |node_id| to |volume|.
void SetOutputNodeVolume(uint64 node_id, int volume);
void SetOutputNodeVolumePercent(uint64 node_id, int volume_percent);
// Sets output mute state to |mute_on| internally, returns true if output mute
// is set.
bool SetOutputMuteInternal(bool mute_on);
// Sets input gain of |node_id| to |gain|.
void SetInputNodeGain(uint64 node_id, int gain);
void SetInputNodeGainPercent(uint64 node_id, int gain_percent);
// Sets input mute state to |mute_on| internally, returns true if input mute
// is set.
bool SetInputMuteInternal(bool mute_on);
// Calling dbus to get nodes data.
void GetNodes();
// Updates the current audio nodes list and switches the active device
// if needed.
void UpdateDevicesAndSwitchActive(const AudioNodeList& nodes);
// Returns true if *|current_active_node_id| device is changed to
// |new_active_device|.
bool ChangeActiveDevice(const AudioDevice& new_active_device,
uint64* current_active_node_id);
// Returns true if the audio nodes change is caused by some non-active
// audio nodes unplugged.
bool NonActiveDeviceUnplugged(size_t old_devices_size,
size_t new_device_size,
uint64 current_active_node);
// Returns true if there is any device change for for input or output,
// specified by |is_input|.
bool HasDeviceChange(const AudioNodeList& new_nodes, bool is_input);
// Handles dbus callback for GetNodes.
void HandleGetNodes(const chromeos::AudioNodeList& node_list, bool success);
// Handles the dbus error callback.
void HandleGetNodesError(const std::string& error_name,
const std::string& error_msg);
// Adds an active node.
// If there is no active node, |node_id| will be switched to become the
// primary active node. Otherwise, it will be added as an additional active
// node.
void AddActiveNode(uint64 node_id, bool notify);
// Adds |node_id| into additional active nodes.
void AddAdditionalActiveNode(uint64 node_id, bool notify);
// Removes |node_id| from additional active nodes.
void RemoveActiveNodeInternal(uint64 node_id, bool notify);
// Returns true if |device| is not found in audio_devices_, or it is found
// but changed its |active| property.
bool FoundNewOrChangedDevice(const AudioDevice& device);
void NotifyActiveNodeChanged(bool is_input);
scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler_;
ObserverList<AudioObserver> observers_;
// Audio data and state.
AudioDeviceMap audio_devices_;
AudioDevicePriorityQueue input_devices_pq_;
AudioDevicePriorityQueue output_devices_pq_;
bool output_mute_on_;
bool input_mute_on_;
int output_volume_;
int input_gain_;
uint64 active_output_node_id_;
uint64 active_input_node_id_;
bool has_alternative_input_;
bool has_alternative_output_;
bool output_mute_locked_;
bool input_mute_locked_;
// Failures are not logged at startup, since CRAS may not be running yet.
bool log_errors_;
base::WeakPtrFactory<CrasAudioHandler> weak_ptr_factory_;
} // namespace chromeos