chromeos/audio/cras_audio_handler.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
   6 #define CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
   7
   8 #include <queue>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "base/observer_list.h"
  14 #include "chromeos/audio/audio_device.h"
  15 #include "chromeos/audio/audio_pref_observer.h"
  16 #include "chromeos/dbus/audio_node.h"
  17 #include "chromeos/dbus/cras_audio_client.h"
  18 #include "chromeos/dbus/session_manager_client.h"
  19 #include "chromeos/dbus/volume_state.h"
  20
  21 class PrefRegistrySimple;
  22 class PrefService;
  23
  24 namespace chromeos {
  25
  26 class AudioDevicesPrefHandler;
  27
  28 class CHROMEOS_EXPORT CrasAudioHandler : public CrasAudioClient::Observer,
  29                                          public AudioPrefObserver,
  30                                          public SessionManagerClient::Observer {
  31  public:
  32   typedef std::priority_queue<AudioDevice,
  33                               std::vector<AudioDevice>,
  34                               AudioDeviceCompare> AudioDevicePriorityQueue;
  35
  36   class AudioObserver {
  37    public:
  38     // Called when output volume changed.
  39     virtual void OnOutputVolumeChanged();
  40
  41     // Called when output mute state changed.
  42     virtual void OnOutputMuteChanged();
  43
  44     // Called when input mute state changed.
  45     virtual void OnInputGainChanged();
  46
  47     // Called when input mute state changed.
  48     virtual void OnInputMuteChanged();
  49
  50     // Called when audio nodes changed.
  51     virtual void OnAudioNodesChanged();
  52
  53     // Called when active audio node changed.
  54     virtual void OnActiveOutputNodeChanged();
  55
  56     // Called when active audio input node changed.
  57     virtual void OnActiveInputNodeChanged();
  58
  59    protected:
  60     AudioObserver();
  61     virtual ~AudioObserver();
  62     DISALLOW_COPY_AND_ASSIGN(AudioObserver);
  63   };
  64
  65   // Sets the global instance. Must be called before any calls to Get().
  66   static void Initialize(
  67       scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler);
  68
  69   // Sets the global instance for testing.
  70   static void InitializeForTesting();
  71
  72   // Destroys the global instance.
  73   static void Shutdown();
  74
  75   // Returns true if the global instance is initialized.
  76   static bool IsInitialized();
  77
  78   // Gets the global instance. Initialize must be called first.
  79   static CrasAudioHandler* Get();
  80
  81   // Adds an audio observer.
  82   virtual void AddAudioObserver(AudioObserver* observer);
  83
  84   // Removes an audio observer.
  85   virtual void RemoveAudioObserver(AudioObserver* observer);
  86
  87   // Returns true if audio output is muted.
  88   virtual bool IsOutputMuted();
  89
  90   // Returns true if audio output is muted for a device.
  91   virtual bool IsOutputMutedForDevice(uint64 device_id);
  92
  93   // Returns true if audio input is muted.
  94   virtual bool IsInputMuted();
  95
  96   // Returns true if audio input is muted for a device.
  97   virtual bool IsInputMutedForDevice(uint64 device_id);
  98
  99   // Returns true if the output volume is below the default mute volume level.
 100   virtual bool IsOutputVolumeBelowDefaultMuteLvel();
 101
 102   // Returns volume level in 0-100% range at which the volume should be muted.
 103   virtual int GetOutputDefaultVolumeMuteThreshold();
 104
 105   // Gets volume level in 0-100% range (0 being pure silence) for the current
 106   // active node.
 107   virtual int GetOutputVolumePercent();
 108
 109   // Gets volume level in 0-100% range (0 being pure silence) for a device.
 110   virtual int GetOutputVolumePercentForDevice(uint64 device_id);
 111
 112   // Gets gain level in 0-100% range (0 being pure silence) for the current
 113   // active node.
 114   virtual int GetInputGainPercent();
 115
 116   // Gets volume level in 0-100% range (0 being pure silence) for a device.
 117   virtual int GetInputGainPercentForDevice(uint64 device_id);
 118
 119   // Returns node_id of the active output node.
 120   virtual uint64 GetActiveOutputNode() const;
 121
 122   // Returns the node_id of the active input node.
 123   virtual uint64 GetActiveInputNode() const;
 124
 125   // Gets the audio devices back in |device_list|.
 126   virtual void GetAudioDevices(AudioDeviceList* device_list) const;
 127
 128   virtual bool GetActiveOutputDevice(AudioDevice* device) const;
 129
 130   // Whether there is alternative input/output audio device.
 131   virtual bool has_alternative_input() const;
 132   virtual bool has_alternative_output() const;
 133
 134   // Sets volume level to |volume_percent|, whose range is from 0-100%.
 135   virtual void SetOutputVolumePercent(int volume_percent);
 136
 137   // Sets gain level to |gain_percent|, whose range is from 0-100%.
 138   virtual void SetInputGainPercent(int gain_percent);
 139
 140   // Adjusts volume up (positive percentage) or down (negative percentage).
 141   virtual void AdjustOutputVolumeByPercent(int adjust_by_percent);
 142
 143   // Adjusts output volume to a minimum audible level if it is too low.
 144   virtual void AdjustOutputVolumeToAudibleLevel();
 145
 146   // Mutes or unmutes audio output device.
 147   virtual void SetOutputMute(bool mute_on);
 148
 149   // Mutes or unmutes audio input device.
 150   virtual void SetInputMute(bool mute_on);
 151
 152   // Switches active audio device to |device|.
 153   virtual void SwitchToDevice(const AudioDevice& device);
 154
 155   // Sets volume/gain level for a device.
 156   virtual void SetVolumeGainPercentForDevice(uint64 device_id, int value);
 157
 158   // Sets the mute for device.
 159   virtual void SetMuteForDevice(uint64 device_id, bool mute_on);
 160
 161   // Enables error logging.
 162   virtual void LogErrors();
 163
 164  protected:
 165   explicit CrasAudioHandler(
 166       scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler);
 167   virtual ~CrasAudioHandler();
 168
 169  private:
 170   // CrasAudioClient::Observer overrides.
 171   virtual void AudioClientRestarted() OVERRIDE;
 172   virtual void NodesChanged() OVERRIDE;
 173   virtual void ActiveOutputNodeChanged(uint64 node_id) OVERRIDE;
 174   virtual void ActiveInputNodeChanged(uint64 node_id) OVERRIDE;
 175
 176   // AudioPrefObserver overrides.
 177   virtual void OnAudioPolicyPrefChanged() OVERRIDE;
 178
 179   // SessionManagerClient::Observer overrides.
 180   virtual void EmitLoginPromptVisibleCalled() OVERRIDE;
 181
 182   // Sets the active audio output/input node to the node with |node_id|.
 183   void SetActiveOutputNode(uint64 node_id);
 184   void SetActiveInputNode(uint64 node_id);
 185
 186   // Sets up the audio device state based on audio policy and audio settings
 187   // saved in prefs.
 188   void SetupAudioInputState();
 189   void SetupAudioOutputState();
 190
 191   const AudioDevice* GetDeviceFromId(uint64 device_id) const;
 192
 193   // Initializes audio state, which should only be called when CrasAudioHandler
 194   // is created or cras audio client is restarted.
 195   void InitializeAudioState();
 196
 197   // Applies the audio muting policies whenever the user logs in or policy
 198   // change notification is received.
 199   void ApplyAudioPolicy();
 200
 201   // Sets output volume of |node_id| to |volume|.
 202   void SetOutputNodeVolume(uint64 node_id, int volume);
 203
 204   // Sets output mute state to |mute_on| internally, returns true if output mute
 205   // is set.
 206   bool SetOutputMuteInternal(bool mute_on);
 207
 208   // Sets input gain of |node_id| to |gain|.
 209   void SetInputNodeGain(uint64 node_id, int gain);
 210
 211   // Sets input mute state to |mute_on| internally, returns true if input mute
 212   // is set.
 213   bool SetInputMuteInternal(bool mute_on);
 214
 215   // Calling dbus to get nodes data.
 216   void GetNodes();
 217
 218   // Updates the current audio nodes list and switches the active device
 219   // if needed.
 220   void UpdateDevicesAndSwitchActive(const AudioNodeList& nodes);
 221
 222   // Returns true if *|current_active_node_id| device is changed to
 223   // |new_active_device|.
 224   bool ChangeActiveDevice(const AudioDevice& new_active_device,
 225                           uint64* current_active_node_id);
 226
 227   // Returns true if the audio nodes change is caused by some non-active
 228   // audio nodes unplugged.
 229   bool NonActiveDeviceUnplugged(size_t old_devices_size,
 230                                 size_t new_device_size,
 231                                 uint64 current_active_node);
 232
 233   // Returns true if there is any device change for for input or output,
 234   // specified by |is_input|.
 235   bool HasDeviceChange(const AudioNodeList& new_nodes, bool is_input);
 236
 237   // Handles dbus callback for GetNodes.
 238   void HandleGetNodes(const chromeos::AudioNodeList& node_list, bool success);
 239
 240   // Handles the dbus error callback.
 241   void HandleGetNodesError(const std::string& error_name,
 242                            const std::string& error_msg);
 243
 244   // Returns true if |device| is not found in audio_devices_.
 245   bool FoundNewDevice(const AudioDevice& device);
 246
 247   // Returns a sanitized AudioDevice from |node|.
 248   AudioDevice GetSanitizedAudioDevice(const AudioNode& node);
 249
 250   scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler_;
 251   base::WeakPtrFactory<CrasAudioHandler> weak_ptr_factory_;
 252   ObserverList<AudioObserver> observers_;
 253
 254   // Audio data and state.
 255   AudioDeviceMap audio_devices_;
 256
 257   AudioDevicePriorityQueue input_devices_pq_;
 258   AudioDevicePriorityQueue output_devices_pq_;
 259
 260   bool output_mute_on_;
 261   bool input_mute_on_;
 262   int output_volume_;
 263   int input_gain_;
 264   uint64 active_output_node_id_;
 265   uint64 active_input_node_id_;
 266   bool has_alternative_input_;
 267   bool has_alternative_output_;
 268
 269   bool output_mute_locked_;
 270   bool input_mute_locked_;
 271
 272   // Failures are not logged at startup, since CRAS may not be running yet.
 273   bool log_errors_;
 274
 275   DISALLOW_COPY_AND_ASSIGN(CrasAudioHandler);
 276 };
 277
 278 }  // namespace chromeos
 279
 280 #endif  // CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_