content/public/browser/media_observer.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 #ifndef CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
   6 #define CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
   7
   8 #include "base/callback_forward.h"
   9 #include "content/public/browser/media_request_state.h"
  10 #include "content/public/common/media_stream_request.h"
  11
  12 namespace content {
  13
  14 // An embedder may implement MediaObserver and return it from
  15 // ContentBrowserClient to receive callbacks as media events occur.
  16 class MediaObserver {
  17  public:
  18   // Called when a audio capture device is plugged in or unplugged.
  19   virtual void OnAudioCaptureDevicesChanged() = 0;
  20
  21   // Called when a video capture device is plugged in or unplugged.
  22   virtual void OnVideoCaptureDevicesChanged() = 0;
  23
  24   // Called when a media request changes state.
  25   virtual void OnMediaRequestStateChanged(
  26       int render_process_id,
  27       int render_frame_id,
  28       int page_request_id,
  29       const GURL& security_origin,
  30       MediaStreamType stream_type,
  31       MediaRequestState state) = 0;
  32
  33   // Called when an audio stream is being created.
  34   virtual void OnCreatingAudioStream(int render_process_id,
  35                                      int render_frame_id) = 0;
  36
  37  protected:
  38   virtual ~MediaObserver() {}
  39 };
  40
  41 }  // namespace content
  42
  43 #endif  // CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_