Do not pass the string device_id via IPC message to create an audio input stream

media/base/audio_capturer_source.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_AUDIO_CAPTURER_SOURCE_H_
 #define MEDIA_BASE_AUDIO_CAPTURER_SOURCE_H_
 
 #include <string>
 #include <vector>
 #include "base/basictypes.h"
@@ skipping 17 matching lines @@
                          int audio_delay_milliseconds,
                          double volume) = 0;
 
     // Signals an error has occurred.
     virtual void OnCaptureError() = 0;
 
    protected:
     virtual ~CaptureCallback() {}
   };
 
-  class CaptureEventHandler {
-   public:
-    // Notification to the client that the device with the specific |device_id|
-    // has been started.
-    virtual void OnDeviceStarted(const std::string& device_id) = 0;
-
-    // Notification to the client that the device has been stopped.
-    virtual void OnDeviceStopped() = 0;
-
-   protected:
-    virtual ~CaptureEventHandler() {}
-  };
-
   // Sets information about the audio stream format and the device
   // to be used. It must be called before any of the other methods.
-  // TODO(xians): Add |device_id| to this Initialize() function.
+  // The |session_id| is used by the browser to identify which input device to
+  // be used. For clients who do not care about device permission and device
+  // selection, pass |session_id| using
+  // AudioInputDeviceManager::kFakeOpenSessionId.
   virtual void Initialize(const AudioParameters& params,
                           CaptureCallback* callback,
-                          CaptureEventHandler* event_handler) = 0;
+                          int session_id) = 0;
 
   // Starts the audio recording.
   virtual void Start() = 0;
 
   // Stops the audio recording. This API is synchronous, and no more data
   // callback will be passed to the client after it is being called.
   virtual void Stop() = 0;
 
   // Sets the capture volume, with range [0.0, 1.0] inclusive.
   virtual void SetVolume(double volume) = 0;
 
-  // Specifies the |session_id| to query which device to use.
-  // TODO(xians): Change the interface to SetDevice(const std::string&).
-  virtual void SetDevice(int session_id) = 0;
-
   // Enables or disables the WebRtc AGC control.
   virtual void SetAutomaticGainControl(bool enable) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<AudioCapturerSource>;
   virtual ~AudioCapturerSource() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_CAPTURER_SOURCE_H_