third_party/blink/renderer/modules/webaudio/channel_merger_node.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
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CHANNEL_MERGER_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CHANNEL_MERGER_NODE_H_

#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"

namespace blink {

class BaseAudioContext;
class ChannelMergerOptions;

class ChannelMergerHandler final : public AudioHandler {
 public:
  static scoped_refptr<ChannelMergerHandler> Create(AudioNode&,
                                                    float sample_rate,
                                                    unsigned number_of_inputs);

  void Process(uint32_t frames_to_process) override;
  void SetChannelCount(unsigned, ExceptionState&) final;
  void SetChannelCountMode(const String&, ExceptionState&) final;

  double TailTime() const override { return 0; }
  double LatencyTime() const override { return 0; }
  bool RequiresTailProcessing() const final { return false; }

 private:
  ChannelMergerHandler(AudioNode&,
                       float sample_rate,
                       unsigned number_of_inputs);
};

class ChannelMergerNode final : public AudioNode {
  DEFINE_WRAPPERTYPEINFO();

 public:
  static ChannelMergerNode* Create(BaseAudioContext&, ExceptionState&);
  static ChannelMergerNode* Create(BaseAudioContext&,
                                   unsigned number_of_inputs,
                                   ExceptionState&);
  static ChannelMergerNode* Create(BaseAudioContext*,
                                   const ChannelMergerOptions*,
                                   ExceptionState&);

  ChannelMergerNode(BaseAudioContext&, unsigned number_of_inputs);

  // InspectorHelperMixin
  void ReportDidCreate() final;
  void ReportWillBeDestroyed() final;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_CHANNEL_MERGER_NODE_H_