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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 
     26 namespace media {
     27 class AudioManager;
     28 }
     29 
     30 namespace content {
     31 
     32 class CONTENT_EXPORT AudioInputDeviceManager : public MediaStreamProvider {
     33  public:
     34   // Calling Start() with this kFakeOpenSessionId will open the default device,
     35   // even though Open() has not been called. This is used to be able to use the
     36   // AudioInputDeviceManager before MediaStream is implemented.
     37   // TODO(xians): Remove it when the webrtc unittest does not need it any more.
     38   static const int kFakeOpenSessionId;
     39 
     40   explicit AudioInputDeviceManager(media::AudioManager* audio_manager);
     41 
     42   // Gets the opened device info by |session_id|. Returns NULL if the device
     43   // is not opened, otherwise the opened device. Called on IO thread.
     44   const StreamDeviceInfo* GetOpenedDeviceInfoById(int session_id);
     45 
     46   // MediaStreamProvider implementation, called on IO thread.
     47   virtual void Register(MediaStreamProviderListener* listener,
     48                         base::MessageLoopProxy* device_thread_loop) OVERRIDE;
     49   virtual void Unregister() OVERRIDE;
     50   virtual void EnumerateDevices(MediaStreamType stream_type) OVERRIDE;
     51   virtual int Open(const StreamDeviceInfo& device) OVERRIDE;
     52   virtual void Close(int session_id) OVERRIDE;
     53 
     54   void UseFakeDevice();
     55   bool ShouldUseFakeDevice() const;
     56 
     57  private:
     58   typedef std::vector<StreamDeviceInfo> StreamDeviceList;
     59   virtual ~AudioInputDeviceManager();
     60 
     61   // Enumerates audio input devices on media stream device thread.
     62   void EnumerateOnDeviceThread(MediaStreamType stream_type);
     63   // Opens the device on media stream device thread.
     64   void OpenOnDeviceThread(int session_id, const StreamDeviceInfo& info);
     65 
     66   // Callback used by EnumerateOnDeviceThread(), called with a list of
     67   // enumerated devices on IO thread.
     68   void DevicesEnumeratedOnIOThread(MediaStreamType stream_type,
     69                                    scoped_ptr<StreamDeviceInfoArray> devices);
     70   // Callback used by OpenOnDeviceThread(), called with the session_id
     71   // referencing the opened device on IO thread.
     72   void OpenedOnIOThread(int session_id, const StreamDeviceInfo& info);
     73   // Callback used by CloseOnDeviceThread(), called with the session_id
     74   // referencing the closed device on IO thread.
     75   void ClosedOnIOThread(MediaStreamType type, int session_id);
     76 
     77   // Verifies that the calling thread is media stream device thread.
     78   bool IsOnDeviceThread() const;
     79 
     80   // Helper to return iterator to the device referenced by |session_id|. If no
     81   // device is found, it will return devices_.end().
     82   StreamDeviceList::iterator GetDevice(int session_id);
     83 
     84   // Only accessed on Browser::IO thread.
     85   MediaStreamProviderListener* listener_;
     86   int next_capture_session_id_;
     87   bool use_fake_device_;
     88   StreamDeviceList devices_;
     89 
     90   media::AudioManager* const audio_manager_;  // Weak.
     91 
     92   // The message loop of media stream device thread that this object runs on.
     93   scoped_refptr<base::MessageLoopProxy> device_loop_;
     94 
     95   DISALLOW_COPY_AND_ASSIGN(AudioInputDeviceManager);
     96 };
     97 
     98 }  // namespace content
     99 
    100 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_
    101