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      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_
     44