third_party/blink/public/platform/web_audio_device.h

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#ifndef THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_DEVICE_H_
#define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_DEVICE_H_

#include "media/base/output_device_info.h"
#include "third_party/blink/public/platform/web_audio_sink_descriptor.h"
#include "third_party/blink/public/platform/web_common.h"
#include "third_party/blink/public/platform/web_vector.h"

namespace blink {

// Abstract interface to the Chromium audio system.
class WebAudioDevice {
 public:
  virtual ~WebAudioDevice() = default;

  virtual void Start() = 0;
  virtual void Stop() = 0;

  // Pause an audio device so that the device doesn't produce
  // requests for audio frames. This is used when a web frame is
  // frozen. This shouldn't be observable to the web application.
  virtual void Pause() = 0;

  // Resume an audio device that was previously paused. Used
  // for frozen frames.
  virtual void Resume() = 0;

  virtual double SampleRate() = 0;
  virtual int FramesPerBuffer() = 0;

  // The maximum channel count of the current audio sink device.
  virtual int MaxChannelCount() = 0;

  // Sets the detect silence flag for |RendererWebAudioDeviceImpl|.
  virtual void SetDetectSilence(bool detect_silence) = 0;

  // Creates a new sink if one hasn't been created yet, and returns the sink
  // status.
  virtual media::OutputDeviceStatus MaybeCreateSinkAndGetStatus() = 0;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_DEVICE_H_