chrome/browser/extensions/api/audio/audio_service.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 CHROME_BROWSER_EXTENSIONS_API_AUDIO_AUDIO_SERVICE_H_
   6 #define CHROME_BROWSER_EXTENSIONS_API_AUDIO_AUDIO_SERVICE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "chrome/common/extensions/api/audio.h"
  11
  12 namespace extensions {
  13
  14 typedef std::vector<linked_ptr<api::audio::OutputDeviceInfo> > OutputInfo;
  15 typedef std::vector<linked_ptr<api::audio::InputDeviceInfo> > InputInfo;
  16 typedef std::vector<std::string> DeviceIdList;
  17
  18 class AudioService {
  19  public:
  20   class Observer {
  21    public:
  22     // Called when anything changes to the audio device configuration.
  23     virtual void OnDeviceChanged() = 0;
  24
  25    protected:
  26     virtual ~Observer() {}
  27   };
  28
  29   // Callback type for completing to get audio device information.
  30   typedef base::Callback<void(const OutputInfo&, const InputInfo&, bool)>
  31       GetInfoCallback;
  32
  33   // Creates a platform-specific AudioService instance.
  34   static AudioService* CreateInstance();
  35
  36   virtual ~AudioService() {}
  37
  38   // Called by listeners to this service to add/remove themselves as observers.
  39   virtual void AddObserver(Observer* observer) = 0;
  40   virtual void RemoveObserver(Observer* observer) = 0;
  41
  42   // Start to query audio device information. Should be called on UI thread.
  43   // The |callback| will be invoked once the query is completed.
  44   virtual void StartGetInfo(const GetInfoCallback& callback) = 0;
  45
  46   // Set the devices in the following list as active. This will only pick
  47   // the first input and first active devices to set to active.
  48   virtual void SetActiveDevices(const DeviceIdList& device_list) = 0;
  49
  50   // Set the muted and volume/gain properties of a device.
  51   virtual bool SetDeviceProperties(const std::string& device_id,
  52                                    bool muted,
  53                                    int volume,
  54                                    int gain) = 0;
  55
  56  protected:
  57   AudioService() {}
  58
  59   DISALLOW_COPY_AND_ASSIGN(AudioService);
  60 };
  61
  62
  63 }  // namespace extensions
  64
  65 #endif  // CHROME_BROWSER_EXTENSIONS_API_AUDIO_AUDIO_SERVICE_H_