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      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_
    107