content/browser/media/capture/web_contents_audio_muter.h

// Copyright 2014 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 CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_

#include "base/macros.h"
#include "base/memory/ref_counted.h"

namespace content {

class WebContents;

// Mutes all audio output from a WebContents.  Internally, this is accomplished
// by providing a MirroringDestination implementation, similar to that found in
// WebContentsAudioInputStream for audio capture/mirroring.  However, the
// WebContentsAudioMuter::MuteDestination only pumps the audio data and discards
// it.
class WebContentsAudioMuter {
 public:
  explicit WebContentsAudioMuter(WebContents* web_contents);
  ~WebContentsAudioMuter();

  bool is_muting() const { return is_muting_; }

  void StartMuting();
  void StopMuting();

 private:
  // AudioMirroringManager::MirroringDestination implementation which is
  // ref-counted so it remains alive as tasks referencing it are posted on both
  // the UI and IO threads.
  class MuteDestination;
  const scoped_refptr<MuteDestination> destination_;

  bool is_muting_;

  DISALLOW_COPY_AND_ASSIGN(WebContentsAudioMuter);
};

}  // namespace content

#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_MUTER_H_