content/browser/renderer_host/media/audio_input_device_manager.h

   1 // Copyright (c) 2012 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 // AudioInputDeviceManager manages the audio input devices. In particular it
   6 // communicates with MediaStreamManager and AudioInputRendererHost on the
   7 // browser IO thread, handles queries like
   8 // enumerate/open/close/GetOpenedDeviceInfoById from MediaStreamManager and
   9 // GetOpenedDeviceInfoById from AudioInputRendererHost.
  10 // The work for enumerate/open/close is handled asynchronously on Media Stream
  11 // device thread, while GetOpenedDeviceInfoById is synchronous on the IO thread.
  12
  13 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_
  14 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_
  15
  16 #include <map>
  17
  18 #include "base/basictypes.h"
  19 #include "base/memory/ref_counted.h"
  20 #include "base/threading/thread.h"
  21 #include "content/browser/renderer_host/media/media_stream_provider.h"
  22 #include "content/common/content_export.h"
  23 #include "content/common/media/media_stream_options.h"
  24 #include "content/public/common/media_stream_request.h"
  25 #include "media/audio/audio_device_name.h"
  26
  27 namespace media {
  28 class AudioManager;
  29 }
  30
  31 namespace content {
  32
  33 class CONTENT_EXPORT AudioInputDeviceManager : public MediaStreamProvider {
  34  public:
  35   // Calling Start() with this kFakeOpenSessionId will open the default device,
  36   // even though Open() has not been called. This is used to be able to use the
  37   // AudioInputDeviceManager before MediaStream is implemented.
  38   // TODO(xians): Remove it when the webrtc unittest does not need it any more.
  39   static const int kFakeOpenSessionId;
  40
  41   explicit AudioInputDeviceManager(media::AudioManager* audio_manager);
  42
  43   // Gets the opened device info by |session_id|. Returns NULL if the device
  44   // is not opened, otherwise the opened device. Called on IO thread.
  45   const StreamDeviceInfo* GetOpenedDeviceInfoById(int session_id);
  46
  47   // MediaStreamProvider implementation, called on IO thread.
  48   virtual void Register(MediaStreamProviderListener* listener,
  49                         const scoped_refptr<base::SingleThreadTaskRunner>&
  50                             device_task_runner) OVERRIDE;
  51   virtual void Unregister() OVERRIDE;
  52   virtual void EnumerateDevices(MediaStreamType stream_type) OVERRIDE;
  53   virtual int Open(const StreamDeviceInfo& device) OVERRIDE;
  54   virtual void Close(int session_id) OVERRIDE;
  55
  56   void UseFakeDevice();
  57   bool ShouldUseFakeDevice() const;
  58
  59  private:
  60   // Used by the unittests to get a list of fake devices.
  61   friend class MediaStreamDispatcherHostTest;
  62   void GetFakeDeviceNames(media::AudioDeviceNames* device_names);
  63
  64   typedef std::vector<StreamDeviceInfo> StreamDeviceList;
  65   virtual ~AudioInputDeviceManager();
  66
  67   // Enumerates audio input devices on media stream device thread.
  68   void EnumerateOnDeviceThread(MediaStreamType stream_type);
  69   // Opens the device on media stream device thread.
  70   void OpenOnDeviceThread(int session_id, const StreamDeviceInfo& info);
  71
  72   // Callback used by EnumerateOnDeviceThread(), called with a list of
  73   // enumerated devices on IO thread.
  74   void DevicesEnumeratedOnIOThread(MediaStreamType stream_type,
  75                                    scoped_ptr<StreamDeviceInfoArray> devices);
  76   // Callback used by OpenOnDeviceThread(), called with the session_id
  77   // referencing the opened device on IO thread.
  78   void OpenedOnIOThread(int session_id, const StreamDeviceInfo& info);
  79   // Callback used by CloseOnDeviceThread(), called with the session_id
  80   // referencing the closed device on IO thread.
  81   void ClosedOnIOThread(MediaStreamType type, int session_id);
  82
  83   // Verifies that the calling thread is media stream device thread.
  84   bool IsOnDeviceThread() const;
  85
  86   // Helper to return iterator to the device referenced by |session_id|. If no
  87   // device is found, it will return devices_.end().
  88   StreamDeviceList::iterator GetDevice(int session_id);
  89
  90   // Only accessed on Browser::IO thread.
  91   MediaStreamProviderListener* listener_;
  92   int next_capture_session_id_;
  93   bool use_fake_device_;
  94   StreamDeviceList devices_;
  95
  96   media::AudioManager* const audio_manager_;  // Weak.
  97
  98   // The message loop of media stream device thread that this object runs on.
  99   scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(AudioInputDeviceManager);
 102 };
 103
 104 }  // namespace content
 105
 106 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_