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
  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_