content/browser/media/capture/web_contents_audio_muter.h

   1 // Copyright 2014 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_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_
   6 #define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9
  10 namespace content {
  11
  12 class WebContents;
  13
  14 // Mutes all audio output from a WebContents.  Internally, this is accomplished
  15 // by providing a MirroringDestination implementation, similar to that found in
  16 // WebContentsAudioInputStream for audio capture/mirroring.  However, the
  17 // WebContentsAudioMuter::MuteDestination only pumps the audio data and discards
  18 // it.
  19 class WebContentsAudioMuter {
  20  public:
  21   explicit WebContentsAudioMuter(WebContents* web_contents);
  22   ~WebContentsAudioMuter();
  23
  24   bool is_muting() const { return is_muting_; }
  25
  26   void StartMuting();
  27   void StopMuting();
  28
  29  private:
  30   // AudioMirroringManager::MirroringDestination implementation which is
  31   // ref-counted so it remains alive as tasks referencing it are posted on both
  32   // the UI and IO threads.
  33   class MuteDestination;
  34   const scoped_refptr<MuteDestination> destination_;
  35
  36   bool is_muting_;
  37
  38   DISALLOW_COPY_AND_ASSIGN(WebContentsAudioMuter);
  39 };
  40
  41 }  // namespace content
  42
  43 #endif  // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_