third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.h

/*
 * Copyright (C) 2012, Intel Corporation. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#ifndef AudioBasicInspectorNode_h
#define AudioBasicInspectorNode_h

#include "modules/webaudio/AudioNode.h"

namespace blink {

class BaseAudioContext;
class ExceptionState;

// AudioBasicInspectorNode is an AudioNode with one input and one output where
// the output might not necessarily connect to another node's input.
// If the output is not connected to any other node, then the
// AudioBasicInspectorNode's processIfNecessary() function will be called
// automatically by BaseAudioContext before the end of each render quantum so
// that it can inspect the audio stream.
class AudioBasicInspectorHandler : public AudioHandler {
 public:
  AudioBasicInspectorHandler(NodeType,
                             AudioNode&,
                             float sampleRate,
                             unsigned outputChannelCount);

  // AudioHandler
  void pullInputs(size_t framesToProcess) final;
  void checkNumberOfChannelsForInput(AudioNodeInput*) final;

  void updatePullStatus();

 private:
  // When setting to true, AudioBasicInspectorHandler will be pulled
  // automaticlly by BaseAudioContext before the end of each render quantum.
  bool m_needAutomaticPull;
};

class AudioBasicInspectorNode : public AudioNode {
 protected:
  explicit AudioBasicInspectorNode(BaseAudioContext& context)
      : AudioNode(context) {}

 private:
  // TODO(tkent): Should AudioBasicInspectorNode override other variants of
  // connect() and disconnect()?
  AudioNode* connect(AudioNode*,
                     unsigned outputIndex,
                     unsigned inputIndex,
                     ExceptionState&) final;
  void disconnect(unsigned outputIndex, ExceptionState&) final;
};

}  // namespace blink

#endif  // AudioBasicInspectorNode_h